Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/usb.h> | |
21 | #include <linux/usbdevice_fs.h> | |
9c8d6178 | 22 | #include <linux/kthread.h> |
4186ecf8 | 23 | #include <linux/mutex.h> |
7dfb7103 | 24 | #include <linux/freezer.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/byteorder.h> | |
28 | ||
29 | #include "usb.h" | |
30 | #include "hcd.h" | |
31 | #include "hub.h" | |
32 | ||
f2a383e4 GKH |
33 | /* if we are in debug mode, always announce new devices */ |
34 | #ifdef DEBUG | |
35 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
36 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
37 | #endif | |
38 | #endif | |
39 | ||
1bb5f66b AS |
40 | struct usb_hub { |
41 | struct device *intfdev; /* the "interface" device */ | |
42 | struct usb_device *hdev; | |
e8054854 | 43 | struct kref kref; |
1bb5f66b AS |
44 | struct urb *urb; /* for interrupt polling pipe */ |
45 | ||
46 | /* buffer for urb ... with extra space in case of babble */ | |
47 | char (*buffer)[8]; | |
48 | dma_addr_t buffer_dma; /* DMA address for buffer */ | |
49 | union { | |
50 | struct usb_hub_status hub; | |
51 | struct usb_port_status port; | |
52 | } *status; /* buffer for status reports */ | |
db90e7a1 | 53 | struct mutex status_mutex; /* for the status buffer */ |
1bb5f66b AS |
54 | |
55 | int error; /* last reported error */ | |
56 | int nerrors; /* track consecutive errors */ | |
57 | ||
58 | struct list_head event_list; /* hubs w/data or errs ready */ | |
59 | unsigned long event_bits[1]; /* status change bitmask */ | |
60 | unsigned long change_bits[1]; /* ports with logical connect | |
61 | status change */ | |
62 | unsigned long busy_bits[1]; /* ports being reset or | |
63 | resumed */ | |
64 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ | |
65 | #error event_bits[] is too short! | |
66 | #endif | |
67 | ||
68 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
69 | struct usb_tt tt; /* Transaction Translator */ | |
70 | ||
71 | unsigned mA_per_port; /* current for each child */ | |
72 | ||
73 | unsigned limited_power:1; | |
74 | unsigned quiescing:1; | |
e8054854 | 75 | unsigned disconnected:1; |
1bb5f66b AS |
76 | |
77 | unsigned has_indicators:1; | |
78 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 79 | struct delayed_work leds; |
8520f380 | 80 | struct delayed_work init_work; |
7cbe5dca | 81 | void **port_owners; |
1bb5f66b AS |
82 | }; |
83 | ||
84 | ||
1da177e4 | 85 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 86 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
87 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
88 | static DEFINE_SPINLOCK(device_state_lock); | |
89 | ||
90 | /* khubd's worklist and its lock */ | |
91 | static DEFINE_SPINLOCK(hub_event_lock); | |
92 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
93 | ||
94 | /* Wakes up khubd */ | |
95 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
96 | ||
9c8d6178 | 97 | static struct task_struct *khubd_task; |
1da177e4 LT |
98 | |
99 | /* cycle leds on hubs that aren't blinking for attention */ | |
100 | static int blinkenlights = 0; | |
101 | module_param (blinkenlights, bool, S_IRUGO); | |
102 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
103 | ||
fd7c519d JK |
104 | /* |
105 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
106 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
107 | */ | |
108 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
109 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
110 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
111 | MODULE_PARM_DESC(initial_descriptor_timeout, |
112 | "initial 64-byte descriptor request timeout in milliseconds " | |
113 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 114 | |
1da177e4 LT |
115 | /* |
116 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
117 | * closely resembles the way Windows works. Hopefully it will be compatible | |
118 | * with a wider range of devices than the old scheme. However some previously | |
119 | * working devices may start giving rise to "device not accepting address" | |
120 | * errors; if that happens the user can try the old scheme by adjusting the | |
121 | * following module parameters. | |
122 | * | |
123 | * For maximum flexibility there are two boolean parameters to control the | |
124 | * hub driver's behavior. On the first initialization attempt, if the | |
125 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
126 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
127 | * is set, then the driver will make another attempt, using the other scheme. | |
128 | */ | |
129 | static int old_scheme_first = 0; | |
130 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
131 | MODULE_PARM_DESC(old_scheme_first, | |
132 | "start with the old device initialization scheme"); | |
133 | ||
134 | static int use_both_schemes = 1; | |
135 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
136 | MODULE_PARM_DESC(use_both_schemes, | |
137 | "try the other device initialization scheme if the " | |
138 | "first one fails"); | |
139 | ||
32fe0198 AS |
140 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
141 | * port reset on some companion controllers. | |
142 | */ | |
143 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
144 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
145 | ||
948fea37 AS |
146 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
147 | #define HUB_DEBOUNCE_STEP 25 | |
148 | #define HUB_DEBOUNCE_STABLE 100 | |
149 | ||
1da177e4 | 150 | |
742120c6 ML |
151 | static int usb_reset_and_verify_device(struct usb_device *udev); |
152 | ||
404d5b18 | 153 | static inline char *portspeed(int portstatus) |
1da177e4 LT |
154 | { |
155 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) | |
156 | return "480 Mb/s"; | |
157 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) | |
158 | return "1.5 Mb/s"; | |
d2e9b4d6 SS |
159 | else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)) |
160 | return "5.0 Gb/s"; | |
1da177e4 LT |
161 | else |
162 | return "12 Mb/s"; | |
163 | } | |
1da177e4 LT |
164 | |
165 | /* Note that hdev or one of its children must be locked! */ | |
25118084 | 166 | static struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
1da177e4 | 167 | { |
25118084 AS |
168 | if (!hdev || !hdev->actconfig) |
169 | return NULL; | |
1da177e4 LT |
170 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
171 | } | |
172 | ||
173 | /* USB 2.0 spec Section 11.24.4.5 */ | |
174 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
175 | { | |
176 | int i, ret; | |
177 | ||
178 | for (i = 0; i < 3; i++) { | |
179 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
180 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
181 | USB_DT_HUB << 8, 0, data, size, | |
182 | USB_CTRL_GET_TIMEOUT); | |
183 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
184 | return ret; | |
185 | } | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | /* | |
190 | * USB 2.0 spec Section 11.24.2.1 | |
191 | */ | |
192 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
193 | { | |
194 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
195 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
196 | } | |
197 | ||
198 | /* | |
199 | * USB 2.0 spec Section 11.24.2.2 | |
200 | */ | |
201 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
202 | { | |
203 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
204 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
205 | NULL, 0, 1000); | |
206 | } | |
207 | ||
208 | /* | |
209 | * USB 2.0 spec Section 11.24.2.13 | |
210 | */ | |
211 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
212 | { | |
213 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
214 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
215 | NULL, 0, 1000); | |
216 | } | |
217 | ||
218 | /* | |
219 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
220 | * for info about using port indicators | |
221 | */ | |
222 | static void set_port_led( | |
223 | struct usb_hub *hub, | |
224 | int port1, | |
225 | int selector | |
226 | ) | |
227 | { | |
228 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
229 | USB_PORT_FEAT_INDICATOR); | |
230 | if (status < 0) | |
231 | dev_dbg (hub->intfdev, | |
232 | "port %d indicator %s status %d\n", | |
233 | port1, | |
234 | ({ char *s; switch (selector) { | |
235 | case HUB_LED_AMBER: s = "amber"; break; | |
236 | case HUB_LED_GREEN: s = "green"; break; | |
237 | case HUB_LED_OFF: s = "off"; break; | |
238 | case HUB_LED_AUTO: s = "auto"; break; | |
239 | default: s = "??"; break; | |
240 | }; s; }), | |
241 | status); | |
242 | } | |
243 | ||
244 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
245 | ||
c4028958 | 246 | static void led_work (struct work_struct *work) |
1da177e4 | 247 | { |
c4028958 DH |
248 | struct usb_hub *hub = |
249 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
250 | struct usb_device *hdev = hub->hdev; |
251 | unsigned i; | |
252 | unsigned changed = 0; | |
253 | int cursor = -1; | |
254 | ||
255 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
256 | return; | |
257 | ||
258 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
259 | unsigned selector, mode; | |
260 | ||
261 | /* 30%-50% duty cycle */ | |
262 | ||
263 | switch (hub->indicator[i]) { | |
264 | /* cycle marker */ | |
265 | case INDICATOR_CYCLE: | |
266 | cursor = i; | |
267 | selector = HUB_LED_AUTO; | |
268 | mode = INDICATOR_AUTO; | |
269 | break; | |
270 | /* blinking green = sw attention */ | |
271 | case INDICATOR_GREEN_BLINK: | |
272 | selector = HUB_LED_GREEN; | |
273 | mode = INDICATOR_GREEN_BLINK_OFF; | |
274 | break; | |
275 | case INDICATOR_GREEN_BLINK_OFF: | |
276 | selector = HUB_LED_OFF; | |
277 | mode = INDICATOR_GREEN_BLINK; | |
278 | break; | |
279 | /* blinking amber = hw attention */ | |
280 | case INDICATOR_AMBER_BLINK: | |
281 | selector = HUB_LED_AMBER; | |
282 | mode = INDICATOR_AMBER_BLINK_OFF; | |
283 | break; | |
284 | case INDICATOR_AMBER_BLINK_OFF: | |
285 | selector = HUB_LED_OFF; | |
286 | mode = INDICATOR_AMBER_BLINK; | |
287 | break; | |
288 | /* blink green/amber = reserved */ | |
289 | case INDICATOR_ALT_BLINK: | |
290 | selector = HUB_LED_GREEN; | |
291 | mode = INDICATOR_ALT_BLINK_OFF; | |
292 | break; | |
293 | case INDICATOR_ALT_BLINK_OFF: | |
294 | selector = HUB_LED_AMBER; | |
295 | mode = INDICATOR_ALT_BLINK; | |
296 | break; | |
297 | default: | |
298 | continue; | |
299 | } | |
300 | if (selector != HUB_LED_AUTO) | |
301 | changed = 1; | |
302 | set_port_led(hub, i + 1, selector); | |
303 | hub->indicator[i] = mode; | |
304 | } | |
305 | if (!changed && blinkenlights) { | |
306 | cursor++; | |
307 | cursor %= hub->descriptor->bNbrPorts; | |
308 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
309 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
310 | changed++; | |
311 | } | |
312 | if (changed) | |
313 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
314 | } | |
315 | ||
316 | /* use a short timeout for hub/port status fetches */ | |
317 | #define USB_STS_TIMEOUT 1000 | |
318 | #define USB_STS_RETRIES 5 | |
319 | ||
320 | /* | |
321 | * USB 2.0 spec Section 11.24.2.6 | |
322 | */ | |
323 | static int get_hub_status(struct usb_device *hdev, | |
324 | struct usb_hub_status *data) | |
325 | { | |
326 | int i, status = -ETIMEDOUT; | |
327 | ||
328 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
329 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
330 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
331 | data, sizeof(*data), USB_STS_TIMEOUT); | |
332 | } | |
333 | return status; | |
334 | } | |
335 | ||
336 | /* | |
337 | * USB 2.0 spec Section 11.24.2.7 | |
338 | */ | |
339 | static int get_port_status(struct usb_device *hdev, int port1, | |
340 | struct usb_port_status *data) | |
341 | { | |
342 | int i, status = -ETIMEDOUT; | |
343 | ||
344 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
345 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
346 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
347 | data, sizeof(*data), USB_STS_TIMEOUT); | |
348 | } | |
349 | return status; | |
350 | } | |
351 | ||
3eb14915 AS |
352 | static int hub_port_status(struct usb_hub *hub, int port1, |
353 | u16 *status, u16 *change) | |
354 | { | |
355 | int ret; | |
356 | ||
357 | mutex_lock(&hub->status_mutex); | |
358 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
359 | if (ret < 4) { | |
360 | dev_err(hub->intfdev, | |
361 | "%s failed (err = %d)\n", __func__, ret); | |
362 | if (ret >= 0) | |
363 | ret = -EIO; | |
364 | } else { | |
365 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
366 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
367 | ret = 0; | |
368 | } | |
369 | mutex_unlock(&hub->status_mutex); | |
370 | return ret; | |
371 | } | |
372 | ||
1da177e4 LT |
373 | static void kick_khubd(struct usb_hub *hub) |
374 | { | |
375 | unsigned long flags; | |
376 | ||
40f122f3 | 377 | /* Suppress autosuspend until khubd runs */ |
ccf5b801 | 378 | atomic_set(&to_usb_interface(hub->intfdev)->pm_usage_cnt, 1); |
40f122f3 | 379 | |
1da177e4 | 380 | spin_lock_irqsave(&hub_event_lock, flags); |
2e2c5eea | 381 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 LT |
382 | list_add_tail(&hub->event_list, &hub_event_list); |
383 | wake_up(&khubd_wait); | |
384 | } | |
385 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
386 | } | |
387 | ||
388 | void usb_kick_khubd(struct usb_device *hdev) | |
389 | { | |
25118084 AS |
390 | struct usb_hub *hub = hdev_to_hub(hdev); |
391 | ||
392 | if (hub) | |
393 | kick_khubd(hub); | |
1da177e4 LT |
394 | } |
395 | ||
396 | ||
397 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 398 | static void hub_irq(struct urb *urb) |
1da177e4 | 399 | { |
ec17cf1c | 400 | struct usb_hub *hub = urb->context; |
e015268d | 401 | int status = urb->status; |
71d2718f | 402 | unsigned i; |
1da177e4 LT |
403 | unsigned long bits; |
404 | ||
e015268d | 405 | switch (status) { |
1da177e4 LT |
406 | case -ENOENT: /* synchronous unlink */ |
407 | case -ECONNRESET: /* async unlink */ | |
408 | case -ESHUTDOWN: /* hardware going away */ | |
409 | return; | |
410 | ||
411 | default: /* presumably an error */ | |
412 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 413 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
414 | if ((++hub->nerrors < 10) || hub->error) |
415 | goto resubmit; | |
e015268d | 416 | hub->error = status; |
1da177e4 | 417 | /* FALL THROUGH */ |
ec17cf1c | 418 | |
1da177e4 LT |
419 | /* let khubd handle things */ |
420 | case 0: /* we got data: port status changed */ | |
421 | bits = 0; | |
422 | for (i = 0; i < urb->actual_length; ++i) | |
423 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
424 | << (i*8); | |
425 | hub->event_bits[0] = bits; | |
426 | break; | |
427 | } | |
428 | ||
429 | hub->nerrors = 0; | |
430 | ||
431 | /* Something happened, let khubd figure it out */ | |
432 | kick_khubd(hub); | |
433 | ||
434 | resubmit: | |
435 | if (hub->quiescing) | |
436 | return; | |
437 | ||
438 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
439 | && status != -ENODEV && status != -EPERM) | |
440 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
441 | } | |
442 | ||
443 | /* USB 2.0 spec Section 11.24.2.3 */ | |
444 | static inline int | |
445 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
446 | { | |
447 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
448 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, | |
449 | tt, NULL, 0, 1000); | |
450 | } | |
451 | ||
452 | /* | |
453 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
454 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
455 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
456 | * both can talk to the same hub concurrently. | |
457 | */ | |
cb88a1b8 | 458 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 459 | { |
c4028958 | 460 | struct usb_hub *hub = |
cb88a1b8 | 461 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 | 462 | unsigned long flags; |
55e5fdfa | 463 | int limit = 100; |
1da177e4 LT |
464 | |
465 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 466 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
d0f830d3 | 467 | struct list_head *next; |
1da177e4 LT |
468 | struct usb_tt_clear *clear; |
469 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 470 | const struct hc_driver *drv; |
1da177e4 LT |
471 | int status; |
472 | ||
d0f830d3 HS |
473 | next = hub->tt.clear_list.next; |
474 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
475 | list_del (&clear->clear_list); |
476 | ||
477 | /* drop lock so HCD can concurrently report other TT errors */ | |
478 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
479 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
1da177e4 LT |
480 | if (status) |
481 | dev_err (&hdev->dev, | |
482 | "clear tt %d (%04x) error %d\n", | |
483 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
484 | |
485 | /* Tell the HCD, even if the operation failed */ | |
486 | drv = clear->hcd->driver; | |
487 | if (drv->clear_tt_buffer_complete) | |
488 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
489 | ||
1bc3c9e1 | 490 | kfree(clear); |
cb88a1b8 | 491 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
492 | } |
493 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
494 | } | |
495 | ||
496 | /** | |
cb88a1b8 AS |
497 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
498 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
499 | * |
500 | * High speed HCDs use this to tell the hub driver that some split control or | |
501 | * bulk transaction failed in a way that requires clearing internal state of | |
502 | * a transaction translator. This is normally detected (and reported) from | |
503 | * interrupt context. | |
504 | * | |
505 | * It may not be possible for that hub to handle additional full (or low) | |
506 | * speed transactions until that state is fully cleared out. | |
507 | */ | |
cb88a1b8 | 508 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 509 | { |
cb88a1b8 AS |
510 | struct usb_device *udev = urb->dev; |
511 | int pipe = urb->pipe; | |
1da177e4 LT |
512 | struct usb_tt *tt = udev->tt; |
513 | unsigned long flags; | |
514 | struct usb_tt_clear *clear; | |
515 | ||
516 | /* we've got to cope with an arbitrary number of pending TT clears, | |
517 | * since each TT has "at least two" buffers that can need it (and | |
518 | * there can be many TTs per hub). even if they're uncommon. | |
519 | */ | |
54e6ecb2 | 520 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
521 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
522 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 523 | return -ENOMEM; |
1da177e4 LT |
524 | } |
525 | ||
526 | /* info that CLEAR_TT_BUFFER needs */ | |
527 | clear->tt = tt->multi ? udev->ttport : 1; | |
528 | clear->devinfo = usb_pipeendpoint (pipe); | |
529 | clear->devinfo |= udev->devnum << 4; | |
530 | clear->devinfo |= usb_pipecontrol (pipe) | |
531 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
532 | : (USB_ENDPOINT_XFER_BULK << 11); | |
533 | if (usb_pipein (pipe)) | |
534 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
535 | |
536 | /* info for completion callback */ | |
537 | clear->hcd = bus_to_hcd(udev->bus); | |
538 | clear->ep = urb->ep; | |
539 | ||
1da177e4 LT |
540 | /* tell keventd to clear state for this TT */ |
541 | spin_lock_irqsave (&tt->lock, flags); | |
542 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 543 | schedule_work(&tt->clear_work); |
1da177e4 | 544 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 545 | return 0; |
1da177e4 | 546 | } |
cb88a1b8 | 547 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 548 | |
8520f380 AS |
549 | /* If do_delay is false, return the number of milliseconds the caller |
550 | * needs to delay. | |
551 | */ | |
552 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
553 | { |
554 | int port1; | |
b789696a | 555 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 556 | unsigned delay; |
4489a571 AS |
557 | u16 wHubCharacteristics = |
558 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
559 | ||
560 | /* Enable power on each port. Some hubs have reserved values | |
561 | * of LPSM (> 2) in their descriptors, even though they are | |
562 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
563 | * but only emulate it. In all cases, the ports won't work | |
564 | * unless we send these messages to the hub. | |
565 | */ | |
566 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 567 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
568 | else |
569 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
570 | "non-switchable hub\n"); | |
571 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
572 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 573 | |
b789696a | 574 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
575 | delay = max(pgood_delay, (unsigned) 100); |
576 | if (do_delay) | |
577 | msleep(delay); | |
578 | return delay; | |
1da177e4 LT |
579 | } |
580 | ||
1da177e4 LT |
581 | static int hub_hub_status(struct usb_hub *hub, |
582 | u16 *status, u16 *change) | |
583 | { | |
584 | int ret; | |
585 | ||
db90e7a1 | 586 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
587 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
588 | if (ret < 0) | |
589 | dev_err (hub->intfdev, | |
441b62c1 | 590 | "%s failed (err = %d)\n", __func__, ret); |
1da177e4 LT |
591 | else { |
592 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
593 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
594 | ret = 0; | |
595 | } | |
db90e7a1 | 596 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
597 | return ret; |
598 | } | |
599 | ||
8b28c752 AS |
600 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
601 | { | |
602 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 603 | int ret = 0; |
8b28c752 | 604 | |
0458d5b4 | 605 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
606 | usb_set_device_state(hdev->children[port1-1], |
607 | USB_STATE_NOTATTACHED); | |
0458d5b4 AS |
608 | if (!hub->error) |
609 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
8b28c752 AS |
610 | if (ret) |
611 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 612 | port1, ret); |
8b28c752 AS |
613 | return ret; |
614 | } | |
615 | ||
0458d5b4 AS |
616 | /* |
617 | * Disable a port and mark a logical connnect-change event, so that some | |
618 | * time later khubd will disconnect() any existing usb_device on the port | |
619 | * and will re-enumerate if there actually is a device attached. | |
620 | */ | |
621 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
622 | { | |
623 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
624 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 625 | |
0458d5b4 AS |
626 | /* FIXME let caller ask to power down the port: |
627 | * - some devices won't enumerate without a VBUS power cycle | |
628 | * - SRP saves power that way | |
629 | * - ... new call, TBD ... | |
630 | * That's easy if this hub can switch power per-port, and | |
631 | * khubd reactivates the port later (timer, SRP, etc). | |
632 | * Powerdown must be optional, because of reset/DFU. | |
633 | */ | |
634 | ||
635 | set_bit(port1, hub->change_bits); | |
636 | kick_khubd(hub); | |
637 | } | |
638 | ||
6ee0b270 | 639 | enum hub_activation_type { |
8520f380 AS |
640 | HUB_INIT, HUB_INIT2, HUB_INIT3, |
641 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, | |
6ee0b270 | 642 | }; |
5e6effae | 643 | |
8520f380 AS |
644 | static void hub_init_func2(struct work_struct *ws); |
645 | static void hub_init_func3(struct work_struct *ws); | |
646 | ||
f2835219 | 647 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
648 | { |
649 | struct usb_device *hdev = hub->hdev; | |
650 | int port1; | |
f2835219 | 651 | int status; |
948fea37 | 652 | bool need_debounce_delay = false; |
8520f380 AS |
653 | unsigned delay; |
654 | ||
655 | /* Continue a partial initialization */ | |
656 | if (type == HUB_INIT2) | |
657 | goto init2; | |
658 | if (type == HUB_INIT3) | |
659 | goto init3; | |
5e6effae | 660 | |
f2835219 AS |
661 | /* After a resume, port power should still be on. |
662 | * For any other type of activation, turn it on. | |
663 | */ | |
8520f380 AS |
664 | if (type != HUB_RESUME) { |
665 | ||
666 | /* Speed up system boot by using a delayed_work for the | |
667 | * hub's initial power-up delays. This is pretty awkward | |
668 | * and the implementation looks like a home-brewed sort of | |
669 | * setjmp/longjmp, but it saves at least 100 ms for each | |
670 | * root hub (assuming usbcore is compiled into the kernel | |
671 | * rather than as a module). It adds up. | |
672 | * | |
673 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
674 | * because for those activation types the ports have to be | |
675 | * operational when we return. In theory this could be done | |
676 | * for HUB_POST_RESET, but it's easier not to. | |
677 | */ | |
678 | if (type == HUB_INIT) { | |
679 | delay = hub_power_on(hub, false); | |
680 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
681 | schedule_delayed_work(&hub->init_work, | |
682 | msecs_to_jiffies(delay)); | |
61fbeba1 AS |
683 | |
684 | /* Suppress autosuspend until init is done */ | |
ccf5b801 AS |
685 | atomic_set(&to_usb_interface(hub->intfdev)-> |
686 | pm_usage_cnt, 1); | |
8520f380 AS |
687 | return; /* Continues at init2: below */ |
688 | } else { | |
689 | hub_power_on(hub, true); | |
690 | } | |
691 | } | |
692 | init2: | |
f2835219 | 693 | |
6ee0b270 AS |
694 | /* Check each port and set hub->change_bits to let khubd know |
695 | * which ports need attention. | |
5e6effae AS |
696 | */ |
697 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
698 | struct usb_device *udev = hdev->children[port1-1]; | |
5e6effae AS |
699 | u16 portstatus, portchange; |
700 | ||
6ee0b270 AS |
701 | portstatus = portchange = 0; |
702 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
703 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
704 | dev_dbg(hub->intfdev, | |
705 | "port %d: status %04x change %04x\n", | |
706 | port1, portstatus, portchange); | |
707 | ||
708 | /* After anything other than HUB_RESUME (i.e., initialization | |
709 | * or any sort of reset), every port should be disabled. | |
710 | * Unconnected ports should likewise be disabled (paranoia), | |
711 | * and so should ports for which we have no usb_device. | |
712 | */ | |
713 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
714 | type != HUB_RESUME || | |
715 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
716 | !udev || | |
717 | udev->state == USB_STATE_NOTATTACHED)) { | |
718 | clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
719 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
5e6effae AS |
720 | } |
721 | ||
948fea37 AS |
722 | /* Clear status-change flags; we'll debounce later */ |
723 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
724 | need_debounce_delay = true; | |
725 | clear_port_feature(hub->hdev, port1, | |
726 | USB_PORT_FEAT_C_CONNECTION); | |
727 | } | |
728 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
729 | need_debounce_delay = true; | |
730 | clear_port_feature(hub->hdev, port1, | |
731 | USB_PORT_FEAT_C_ENABLE); | |
732 | } | |
733 | ||
6ee0b270 AS |
734 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
735 | /* Tell khubd to disconnect the device or | |
736 | * check for a new connection | |
737 | */ | |
738 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
739 | set_bit(port1, hub->change_bits); | |
740 | ||
741 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
742 | /* The power session apparently survived the resume. | |
743 | * If there was an overcurrent or suspend change | |
744 | * (i.e., remote wakeup request), have khubd | |
745 | * take care of it. | |
746 | */ | |
747 | if (portchange) | |
748 | set_bit(port1, hub->change_bits); | |
5e6effae | 749 | |
6ee0b270 | 750 | } else if (udev->persist_enabled) { |
6ee0b270 | 751 | #ifdef CONFIG_PM |
5e6effae | 752 | udev->reset_resume = 1; |
6ee0b270 | 753 | #endif |
8808f00c AS |
754 | set_bit(port1, hub->change_bits); |
755 | ||
6ee0b270 AS |
756 | } else { |
757 | /* The power session is gone; tell khubd */ | |
758 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
759 | set_bit(port1, hub->change_bits); | |
5e6effae | 760 | } |
5e6effae AS |
761 | } |
762 | ||
948fea37 AS |
763 | /* If no port-status-change flags were set, we don't need any |
764 | * debouncing. If flags were set we can try to debounce the | |
765 | * ports all at once right now, instead of letting khubd do them | |
766 | * one at a time later on. | |
767 | * | |
768 | * If any port-status changes do occur during this delay, khubd | |
769 | * will see them later and handle them normally. | |
770 | */ | |
8520f380 AS |
771 | if (need_debounce_delay) { |
772 | delay = HUB_DEBOUNCE_STABLE; | |
773 | ||
774 | /* Don't do a long sleep inside a workqueue routine */ | |
775 | if (type == HUB_INIT2) { | |
776 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
777 | schedule_delayed_work(&hub->init_work, | |
778 | msecs_to_jiffies(delay)); | |
779 | return; /* Continues at init3: below */ | |
780 | } else { | |
781 | msleep(delay); | |
782 | } | |
783 | } | |
784 | init3: | |
f2835219 AS |
785 | hub->quiescing = 0; |
786 | ||
787 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
788 | if (status < 0) | |
789 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
790 | if (hub->has_indicators && blinkenlights) | |
791 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
792 | ||
793 | /* Scan all ports that need attention */ | |
794 | kick_khubd(hub); | |
5e6effae AS |
795 | } |
796 | ||
8520f380 AS |
797 | /* Implement the continuations for the delays above */ |
798 | static void hub_init_func2(struct work_struct *ws) | |
799 | { | |
800 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
801 | ||
802 | hub_activate(hub, HUB_INIT2); | |
803 | } | |
804 | ||
805 | static void hub_init_func3(struct work_struct *ws) | |
806 | { | |
807 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
808 | ||
809 | hub_activate(hub, HUB_INIT3); | |
810 | } | |
811 | ||
4330354f AS |
812 | enum hub_quiescing_type { |
813 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
814 | }; | |
815 | ||
816 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
817 | { | |
818 | struct usb_device *hdev = hub->hdev; | |
819 | int i; | |
820 | ||
8520f380 AS |
821 | cancel_delayed_work_sync(&hub->init_work); |
822 | ||
4330354f AS |
823 | /* khubd and related activity won't re-trigger */ |
824 | hub->quiescing = 1; | |
825 | ||
826 | if (type != HUB_SUSPEND) { | |
827 | /* Disconnect all the children */ | |
828 | for (i = 0; i < hdev->maxchild; ++i) { | |
829 | if (hdev->children[i]) | |
830 | usb_disconnect(&hdev->children[i]); | |
831 | } | |
832 | } | |
833 | ||
834 | /* Stop khubd and related activity */ | |
835 | usb_kill_urb(hub->urb); | |
836 | if (hub->has_indicators) | |
837 | cancel_delayed_work_sync(&hub->leds); | |
838 | if (hub->tt.hub) | |
cb88a1b8 | 839 | cancel_work_sync(&hub->tt.clear_work); |
4330354f AS |
840 | } |
841 | ||
3eb14915 AS |
842 | /* caller has locked the hub device */ |
843 | static int hub_pre_reset(struct usb_interface *intf) | |
844 | { | |
845 | struct usb_hub *hub = usb_get_intfdata(intf); | |
846 | ||
4330354f | 847 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 848 | return 0; |
7d069b7d AS |
849 | } |
850 | ||
851 | /* caller has locked the hub device */ | |
f07600cf | 852 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 853 | { |
7de18d8b AS |
854 | struct usb_hub *hub = usb_get_intfdata(intf); |
855 | ||
f2835219 | 856 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 857 | return 0; |
7d069b7d AS |
858 | } |
859 | ||
1da177e4 LT |
860 | static int hub_configure(struct usb_hub *hub, |
861 | struct usb_endpoint_descriptor *endpoint) | |
862 | { | |
b356b7c7 | 863 | struct usb_hcd *hcd; |
1da177e4 LT |
864 | struct usb_device *hdev = hub->hdev; |
865 | struct device *hub_dev = hub->intfdev; | |
866 | u16 hubstatus, hubchange; | |
74ad9bd2 | 867 | u16 wHubCharacteristics; |
1da177e4 LT |
868 | unsigned int pipe; |
869 | int maxp, ret; | |
7cbe5dca | 870 | char *message = "out of memory"; |
1da177e4 LT |
871 | |
872 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, | |
873 | &hub->buffer_dma); | |
874 | if (!hub->buffer) { | |
1da177e4 LT |
875 | ret = -ENOMEM; |
876 | goto fail; | |
877 | } | |
878 | ||
879 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
880 | if (!hub->status) { | |
1da177e4 LT |
881 | ret = -ENOMEM; |
882 | goto fail; | |
883 | } | |
db90e7a1 | 884 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
885 | |
886 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
887 | if (!hub->descriptor) { | |
1da177e4 LT |
888 | ret = -ENOMEM; |
889 | goto fail; | |
890 | } | |
891 | ||
892 | /* Request the entire hub descriptor. | |
893 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
894 | * but the hub can/will return fewer bytes here. | |
895 | */ | |
896 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
897 | sizeof(*hub->descriptor)); | |
898 | if (ret < 0) { | |
899 | message = "can't read hub descriptor"; | |
900 | goto fail; | |
901 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
902 | message = "hub has too many ports!"; | |
903 | ret = -ENODEV; | |
904 | goto fail; | |
905 | } | |
906 | ||
907 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
908 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
909 | (hdev->maxchild == 1) ? "" : "s"); | |
910 | ||
7cbe5dca AS |
911 | hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); |
912 | if (!hub->port_owners) { | |
913 | ret = -ENOMEM; | |
914 | goto fail; | |
915 | } | |
916 | ||
74ad9bd2 | 917 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 918 | |
74ad9bd2 | 919 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
920 | int i; |
921 | char portstr [USB_MAXCHILDREN + 1]; | |
922 | ||
923 | for (i = 0; i < hdev->maxchild; i++) | |
924 | portstr[i] = hub->descriptor->DeviceRemovable | |
925 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
926 | ? 'F' : 'R'; | |
927 | portstr[hdev->maxchild] = 0; | |
928 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
929 | } else | |
930 | dev_dbg(hub_dev, "standalone hub\n"); | |
931 | ||
74ad9bd2 | 932 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
933 | case 0x00: |
934 | dev_dbg(hub_dev, "ganged power switching\n"); | |
935 | break; | |
936 | case 0x01: | |
937 | dev_dbg(hub_dev, "individual port power switching\n"); | |
938 | break; | |
939 | case 0x02: | |
940 | case 0x03: | |
941 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
942 | break; | |
943 | } | |
944 | ||
74ad9bd2 | 945 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
946 | case 0x00: |
947 | dev_dbg(hub_dev, "global over-current protection\n"); | |
948 | break; | |
949 | case 0x08: | |
950 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
951 | break; | |
952 | case 0x10: | |
953 | case 0x18: | |
954 | dev_dbg(hub_dev, "no over-current protection\n"); | |
955 | break; | |
956 | } | |
957 | ||
958 | spin_lock_init (&hub->tt.lock); | |
959 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 960 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 LT |
961 | switch (hdev->descriptor.bDeviceProtocol) { |
962 | case 0: | |
963 | break; | |
964 | case 1: | |
965 | dev_dbg(hub_dev, "Single TT\n"); | |
966 | hub->tt.hub = hdev; | |
967 | break; | |
968 | case 2: | |
969 | ret = usb_set_interface(hdev, 0, 1); | |
970 | if (ret == 0) { | |
971 | dev_dbg(hub_dev, "TT per port\n"); | |
972 | hub->tt.multi = 1; | |
973 | } else | |
974 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
975 | ret); | |
976 | hub->tt.hub = hdev; | |
977 | break; | |
d2e9b4d6 SS |
978 | case 3: |
979 | /* USB 3.0 hubs don't have a TT */ | |
980 | break; | |
1da177e4 LT |
981 | default: |
982 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
983 | hdev->descriptor.bDeviceProtocol); | |
984 | break; | |
985 | } | |
986 | ||
e09711ae | 987 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 988 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae | 989 | case HUB_TTTT_8_BITS: |
990 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
991 | hub->tt.think_time = 666; | |
992 | dev_dbg(hub_dev, "TT requires at most %d " | |
993 | "FS bit times (%d ns)\n", | |
994 | 8, hub->tt.think_time); | |
995 | } | |
1da177e4 | 996 | break; |
e09711ae | 997 | case HUB_TTTT_16_BITS: |
998 | hub->tt.think_time = 666 * 2; | |
999 | dev_dbg(hub_dev, "TT requires at most %d " | |
1000 | "FS bit times (%d ns)\n", | |
1001 | 16, hub->tt.think_time); | |
1da177e4 | 1002 | break; |
e09711ae | 1003 | case HUB_TTTT_24_BITS: |
1004 | hub->tt.think_time = 666 * 3; | |
1005 | dev_dbg(hub_dev, "TT requires at most %d " | |
1006 | "FS bit times (%d ns)\n", | |
1007 | 24, hub->tt.think_time); | |
1da177e4 | 1008 | break; |
e09711ae | 1009 | case HUB_TTTT_32_BITS: |
1010 | hub->tt.think_time = 666 * 4; | |
1011 | dev_dbg(hub_dev, "TT requires at most %d " | |
1012 | "FS bit times (%d ns)\n", | |
1013 | 32, hub->tt.think_time); | |
1da177e4 LT |
1014 | break; |
1015 | } | |
1016 | ||
1017 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1018 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1019 | hub->has_indicators = 1; |
1020 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1021 | } | |
1022 | ||
1023 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1024 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1025 | ||
1026 | /* power budgeting mostly matters with bus-powered hubs, | |
1027 | * and battery-powered root hubs (may provide just 8 mA). | |
1028 | */ | |
1029 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 1030 | if (ret < 2) { |
1da177e4 LT |
1031 | message = "can't get hub status"; |
1032 | goto fail; | |
1033 | } | |
7d35b929 AS |
1034 | le16_to_cpus(&hubstatus); |
1035 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
1036 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
1037 | hub->mA_per_port = 500; | |
1038 | else { | |
1039 | hub->mA_per_port = hdev->bus_mA; | |
1040 | hub->limited_power = 1; | |
1041 | } | |
7d35b929 | 1042 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
1043 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1044 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
1045 | hub->limited_power = 1; |
1046 | if (hdev->maxchild > 0) { | |
1047 | int remaining = hdev->bus_mA - | |
1048 | hub->descriptor->bHubContrCurrent; | |
1049 | ||
1050 | if (remaining < hdev->maxchild * 100) | |
1051 | dev_warn(hub_dev, | |
1052 | "insufficient power available " | |
1053 | "to use all downstream ports\n"); | |
1054 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
1055 | } | |
1056 | } else { /* Self-powered external hub */ | |
1057 | /* FIXME: What about battery-powered external hubs that | |
1058 | * provide less current per port? */ | |
1059 | hub->mA_per_port = 500; | |
7d35b929 | 1060 | } |
55c52718 AS |
1061 | if (hub->mA_per_port < 500) |
1062 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
1063 | hub->mA_per_port); | |
1da177e4 | 1064 | |
b356b7c7 SS |
1065 | /* Update the HCD's internal representation of this hub before khubd |
1066 | * starts getting port status changes for devices under the hub. | |
1067 | */ | |
1068 | hcd = bus_to_hcd(hdev->bus); | |
1069 | if (hcd->driver->update_hub_device) { | |
1070 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1071 | &hub->tt, GFP_KERNEL); | |
1072 | if (ret < 0) { | |
1073 | message = "can't update HCD hub info"; | |
1074 | goto fail; | |
1075 | } | |
1076 | } | |
1077 | ||
1da177e4 LT |
1078 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
1079 | if (ret < 0) { | |
1080 | message = "can't get hub status"; | |
1081 | goto fail; | |
1082 | } | |
1083 | ||
1084 | /* local power status reports aren't always correct */ | |
1085 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1086 | dev_dbg(hub_dev, "local power source is %s\n", | |
1087 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1088 | ? "lost (inactive)" : "good"); | |
1089 | ||
74ad9bd2 | 1090 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1091 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1092 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1093 | ||
88fafff9 | 1094 | /* set up the interrupt endpoint |
1095 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1096 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1097 | * to send more data (and thus cause overflow). For root hubs, | |
1098 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1099 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1100 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1101 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1102 | ||
1103 | if (maxp > sizeof(*hub->buffer)) | |
1104 | maxp = sizeof(*hub->buffer); | |
1105 | ||
1106 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1107 | if (!hub->urb) { | |
1da177e4 LT |
1108 | ret = -ENOMEM; |
1109 | goto fail; | |
1110 | } | |
1111 | ||
1112 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1113 | hub, endpoint->bInterval); | |
1114 | hub->urb->transfer_dma = hub->buffer_dma; | |
1115 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1116 | ||
1117 | /* maybe cycle the hub leds */ | |
1118 | if (hub->has_indicators && blinkenlights) | |
1119 | hub->indicator [0] = INDICATOR_CYCLE; | |
1120 | ||
f2835219 | 1121 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1122 | return 0; |
1123 | ||
1124 | fail: | |
1125 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1126 | message, ret); | |
1127 | /* hub_disconnect() frees urb and descriptor */ | |
1128 | return ret; | |
1129 | } | |
1130 | ||
e8054854 AS |
1131 | static void hub_release(struct kref *kref) |
1132 | { | |
1133 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1134 | ||
1135 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1136 | kfree(hub); | |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | static unsigned highspeed_hubs; |
1140 | ||
1141 | static void hub_disconnect(struct usb_interface *intf) | |
1142 | { | |
1143 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
1144 | |
1145 | /* Take the hub off the event list and don't let it be added again */ | |
1146 | spin_lock_irq(&hub_event_lock); | |
1147 | list_del_init(&hub->event_list); | |
1148 | hub->disconnected = 1; | |
1149 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1150 | |
7de18d8b AS |
1151 | /* Disconnect all children and quiesce the hub */ |
1152 | hub->error = 0; | |
4330354f | 1153 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1154 | |
8b28c752 | 1155 | usb_set_intfdata (intf, NULL); |
7cbe5dca | 1156 | hub->hdev->maxchild = 0; |
1da177e4 | 1157 | |
e8054854 | 1158 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1159 | highspeed_hubs--; |
1160 | ||
1da177e4 | 1161 | usb_free_urb(hub->urb); |
7cbe5dca | 1162 | kfree(hub->port_owners); |
1bc3c9e1 | 1163 | kfree(hub->descriptor); |
1bc3c9e1 | 1164 | kfree(hub->status); |
e8054854 AS |
1165 | usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, |
1166 | hub->buffer_dma); | |
1da177e4 | 1167 | |
e8054854 | 1168 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1172 | { | |
1173 | struct usb_host_interface *desc; | |
1174 | struct usb_endpoint_descriptor *endpoint; | |
1175 | struct usb_device *hdev; | |
1176 | struct usb_hub *hub; | |
1177 | ||
1178 | desc = intf->cur_altsetting; | |
1179 | hdev = interface_to_usbdev(intf); | |
1180 | ||
38f3ad5e | 1181 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1182 | dev_err(&intf->dev, |
1183 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1184 | return -E2BIG; |
1185 | } | |
1186 | ||
89ccbdc9 DB |
1187 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1188 | if (hdev->parent) { | |
1189 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1190 | return -ENODEV; | |
1191 | } | |
1192 | #endif | |
1193 | ||
1da177e4 LT |
1194 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1195 | /* specs is not defined, but it works */ | |
1196 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1197 | (desc->desc.bInterfaceSubClass != 1)) { | |
1198 | descriptor_error: | |
1199 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1200 | return -EIO; | |
1201 | } | |
1202 | ||
1203 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1204 | if (desc->desc.bNumEndpoints != 1) | |
1205 | goto descriptor_error; | |
1206 | ||
1207 | endpoint = &desc->endpoint[0].desc; | |
1208 | ||
fbf81c29 LFC |
1209 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1210 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1211 | goto descriptor_error; |
1212 | ||
1213 | /* We found a hub */ | |
1214 | dev_info (&intf->dev, "USB hub found\n"); | |
1215 | ||
0a1ef3b5 | 1216 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1217 | if (!hub) { |
1218 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1219 | return -ENOMEM; | |
1220 | } | |
1221 | ||
e8054854 | 1222 | kref_init(&hub->kref); |
1da177e4 LT |
1223 | INIT_LIST_HEAD(&hub->event_list); |
1224 | hub->intfdev = &intf->dev; | |
1225 | hub->hdev = hdev; | |
c4028958 | 1226 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1227 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1228 | usb_get_intf(intf); |
1da177e4 LT |
1229 | |
1230 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1231 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
1232 | |
1233 | if (hdev->speed == USB_SPEED_HIGH) | |
1234 | highspeed_hubs++; | |
1235 | ||
1236 | if (hub_configure(hub, endpoint) >= 0) | |
1237 | return 0; | |
1238 | ||
1239 | hub_disconnect (intf); | |
1240 | return -ENODEV; | |
1241 | } | |
1242 | ||
1243 | static int | |
1244 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1245 | { | |
1246 | struct usb_device *hdev = interface_to_usbdev (intf); | |
1247 | ||
1248 | /* assert ifno == 0 (part of hub spec) */ | |
1249 | switch (code) { | |
1250 | case USBDEVFS_HUB_PORTINFO: { | |
1251 | struct usbdevfs_hub_portinfo *info = user_data; | |
1252 | int i; | |
1253 | ||
1254 | spin_lock_irq(&device_state_lock); | |
1255 | if (hdev->devnum <= 0) | |
1256 | info->nports = 0; | |
1257 | else { | |
1258 | info->nports = hdev->maxchild; | |
1259 | for (i = 0; i < info->nports; i++) { | |
1260 | if (hdev->children[i] == NULL) | |
1261 | info->port[i] = 0; | |
1262 | else | |
1263 | info->port[i] = | |
1264 | hdev->children[i]->devnum; | |
1265 | } | |
1266 | } | |
1267 | spin_unlock_irq(&device_state_lock); | |
1268 | ||
1269 | return info->nports + 1; | |
1270 | } | |
1271 | ||
1272 | default: | |
1273 | return -ENOSYS; | |
1274 | } | |
1275 | } | |
1276 | ||
7cbe5dca AS |
1277 | /* |
1278 | * Allow user programs to claim ports on a hub. When a device is attached | |
1279 | * to one of these "claimed" ports, the program will "own" the device. | |
1280 | */ | |
1281 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
1282 | void ***ppowner) | |
1283 | { | |
1284 | if (hdev->state == USB_STATE_NOTATTACHED) | |
1285 | return -ENODEV; | |
1286 | if (port1 == 0 || port1 > hdev->maxchild) | |
1287 | return -EINVAL; | |
1288 | ||
1289 | /* This assumes that devices not managed by the hub driver | |
1290 | * will always have maxchild equal to 0. | |
1291 | */ | |
1292 | *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); | |
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | /* In the following three functions, the caller must hold hdev's lock */ | |
1297 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1298 | { | |
1299 | int rc; | |
1300 | void **powner; | |
1301 | ||
1302 | rc = find_port_owner(hdev, port1, &powner); | |
1303 | if (rc) | |
1304 | return rc; | |
1305 | if (*powner) | |
1306 | return -EBUSY; | |
1307 | *powner = owner; | |
1308 | return rc; | |
1309 | } | |
1310 | ||
1311 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1312 | { | |
1313 | int rc; | |
1314 | void **powner; | |
1315 | ||
1316 | rc = find_port_owner(hdev, port1, &powner); | |
1317 | if (rc) | |
1318 | return rc; | |
1319 | if (*powner != owner) | |
1320 | return -ENOENT; | |
1321 | *powner = NULL; | |
1322 | return rc; | |
1323 | } | |
1324 | ||
1325 | void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) | |
1326 | { | |
1327 | int n; | |
1328 | void **powner; | |
1329 | ||
1330 | n = find_port_owner(hdev, 1, &powner); | |
1331 | if (n == 0) { | |
1332 | for (; n < hdev->maxchild; (++n, ++powner)) { | |
1333 | if (*powner == owner) | |
1334 | *powner = NULL; | |
1335 | } | |
1336 | } | |
1337 | } | |
1338 | ||
1339 | /* The caller must hold udev's lock */ | |
1340 | bool usb_device_is_owned(struct usb_device *udev) | |
1341 | { | |
1342 | struct usb_hub *hub; | |
1343 | ||
1344 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1345 | return false; | |
1346 | hub = hdev_to_hub(udev->parent); | |
1347 | return !!hub->port_owners[udev->portnum - 1]; | |
1348 | } | |
1349 | ||
1da177e4 | 1350 | |
1da177e4 LT |
1351 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1352 | { | |
1353 | int i; | |
1354 | ||
1355 | for (i = 0; i < udev->maxchild; ++i) { | |
1356 | if (udev->children[i]) | |
1357 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1358 | } | |
15123006 | 1359 | if (udev->state == USB_STATE_SUSPENDED) { |
ee49fb5d | 1360 | udev->discon_suspended = 1; |
15123006 SS |
1361 | udev->active_duration -= jiffies; |
1362 | } | |
1da177e4 LT |
1363 | udev->state = USB_STATE_NOTATTACHED; |
1364 | } | |
1365 | ||
1366 | /** | |
1367 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1368 | * @udev: pointer to device whose state should be changed | |
1369 | * @new_state: new state value to be stored | |
1370 | * | |
1371 | * udev->state is _not_ fully protected by the device lock. Although | |
1372 | * most transitions are made only while holding the lock, the state can | |
1373 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1374 | * is so that devices can be marked as disconnected as soon as possible, | |
1375 | * without having to wait for any semaphores to be released. As a result, | |
1376 | * all changes to any device's state must be protected by the | |
1377 | * device_state_lock spinlock. | |
1378 | * | |
1379 | * Once a device has been added to the device tree, all changes to its state | |
1380 | * should be made using this routine. The state should _not_ be set directly. | |
1381 | * | |
1382 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1383 | * Otherwise udev->state is set to new_state, and if new_state is | |
1384 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1385 | * to USB_STATE_NOTATTACHED. | |
1386 | */ | |
1387 | void usb_set_device_state(struct usb_device *udev, | |
1388 | enum usb_device_state new_state) | |
1389 | { | |
1390 | unsigned long flags; | |
1391 | ||
1392 | spin_lock_irqsave(&device_state_lock, flags); | |
1393 | if (udev->state == USB_STATE_NOTATTACHED) | |
1394 | ; /* do nothing */ | |
b94dc6b5 | 1395 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1396 | |
1397 | /* root hub wakeup capabilities are managed out-of-band | |
1398 | * and may involve silicon errata ... ignore them here. | |
1399 | */ | |
1400 | if (udev->parent) { | |
645daaab AS |
1401 | if (udev->state == USB_STATE_SUSPENDED |
1402 | || new_state == USB_STATE_SUSPENDED) | |
1403 | ; /* No change to wakeup settings */ | |
1404 | else if (new_state == USB_STATE_CONFIGURED) | |
fb669cc0 DB |
1405 | device_init_wakeup(&udev->dev, |
1406 | (udev->actconfig->desc.bmAttributes | |
1407 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1408 | else |
fb669cc0 DB |
1409 | device_init_wakeup(&udev->dev, 0); |
1410 | } | |
15123006 SS |
1411 | if (udev->state == USB_STATE_SUSPENDED && |
1412 | new_state != USB_STATE_SUSPENDED) | |
1413 | udev->active_duration -= jiffies; | |
1414 | else if (new_state == USB_STATE_SUSPENDED && | |
1415 | udev->state != USB_STATE_SUSPENDED) | |
1416 | udev->active_duration += jiffies; | |
645daaab | 1417 | udev->state = new_state; |
b94dc6b5 | 1418 | } else |
1da177e4 LT |
1419 | recursively_mark_NOTATTACHED(udev); |
1420 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1421 | } | |
6da9c990 | 1422 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1423 | |
8af548dc IPG |
1424 | /* |
1425 | * WUSB devices are simple: they have no hubs behind, so the mapping | |
1426 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1427 | * life of the device connection logic in | |
1428 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1429 | * handshake we need to assign a temporary address in the unauthorized | |
1430 | * space. For simplicity we use the first virtual port number found to | |
1431 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1432 | * and that becomes it's address [X < 128] or its unauthorized address | |
1433 | * [X | 0x80]. | |
1434 | * | |
1435 | * We add 1 as an offset to the one-based USB-stack port number | |
1436 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1437 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1438 | * uses always #1 for the root hub of the controller. So USB stack's | |
1439 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1440 | * |
1441 | * Devices connected under xHCI are not as simple. The host controller | |
1442 | * supports virtualization, so the hardware assigns device addresses and | |
1443 | * the HCD must setup data structures before issuing a set address | |
1444 | * command to the hardware. | |
8af548dc | 1445 | */ |
1da177e4 LT |
1446 | static void choose_address(struct usb_device *udev) |
1447 | { | |
1448 | int devnum; | |
1449 | struct usb_bus *bus = udev->bus; | |
1450 | ||
1451 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1452 | if (udev->wusb) { |
1453 | devnum = udev->portnum + 1; | |
1454 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1455 | } else { | |
1456 | /* Try to allocate the next devnum beginning at | |
1457 | * bus->devnum_next. */ | |
1458 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1459 | bus->devnum_next); | |
1460 | if (devnum >= 128) | |
1461 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1462 | 128, 1); | |
1463 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1464 | } | |
1da177e4 LT |
1465 | if (devnum < 128) { |
1466 | set_bit(devnum, bus->devmap.devicemap); | |
1467 | udev->devnum = devnum; | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | static void release_address(struct usb_device *udev) | |
1472 | { | |
1473 | if (udev->devnum > 0) { | |
1474 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1475 | udev->devnum = -1; | |
1476 | } | |
1477 | } | |
1478 | ||
4953d141 DV |
1479 | static void update_address(struct usb_device *udev, int devnum) |
1480 | { | |
1481 | /* The address for a WUSB device is managed by wusbcore. */ | |
1482 | if (!udev->wusb) | |
1483 | udev->devnum = devnum; | |
1484 | } | |
1485 | ||
d5d4db70 AS |
1486 | #ifdef CONFIG_USB_SUSPEND |
1487 | ||
1488 | static void usb_stop_pm(struct usb_device *udev) | |
1489 | { | |
1490 | /* Synchronize with the ksuspend thread to prevent any more | |
1491 | * autosuspend requests from being submitted, and decrement | |
1492 | * the parent's count of unsuspended children. | |
1493 | */ | |
1494 | usb_pm_lock(udev); | |
1495 | if (udev->parent && !udev->discon_suspended) | |
1496 | usb_autosuspend_device(udev->parent); | |
1497 | usb_pm_unlock(udev); | |
1498 | ||
9ac39f28 AS |
1499 | /* Stop any autosuspend or autoresume requests already submitted */ |
1500 | cancel_delayed_work_sync(&udev->autosuspend); | |
1501 | cancel_work_sync(&udev->autoresume); | |
d5d4db70 AS |
1502 | } |
1503 | ||
1504 | #else | |
1505 | ||
1506 | static inline void usb_stop_pm(struct usb_device *udev) | |
1507 | { } | |
1508 | ||
1509 | #endif | |
1510 | ||
1da177e4 LT |
1511 | /** |
1512 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1513 | * @pdev: pointer to device being disconnected | |
1514 | * Context: !in_interrupt () | |
1515 | * | |
1516 | * Something got disconnected. Get rid of it and all of its children. | |
1517 | * | |
1518 | * If *pdev is a normal device then the parent hub must already be locked. | |
1519 | * If *pdev is a root hub then this routine will acquire the | |
1520 | * usb_bus_list_lock on behalf of the caller. | |
1521 | * | |
1522 | * Only hub drivers (including virtual root hub drivers for host | |
1523 | * controllers) should ever call this. | |
1524 | * | |
1525 | * This call is synchronous, and may not be used in an interrupt context. | |
1526 | */ | |
1527 | void usb_disconnect(struct usb_device **pdev) | |
1528 | { | |
1529 | struct usb_device *udev = *pdev; | |
1530 | int i; | |
1531 | ||
1532 | if (!udev) { | |
441b62c1 | 1533 | pr_debug ("%s nodev\n", __func__); |
1da177e4 LT |
1534 | return; |
1535 | } | |
1536 | ||
1537 | /* mark the device as inactive, so any further urb submissions for | |
1538 | * this device (and any of its children) will fail immediately. | |
1539 | * this quiesces everyting except pending urbs. | |
1540 | */ | |
1541 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1542 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1543 | ||
9ad3d6cc AS |
1544 | usb_lock_device(udev); |
1545 | ||
1da177e4 LT |
1546 | /* Free up all the children before we remove this device */ |
1547 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1548 | if (udev->children[i]) | |
1549 | usb_disconnect(&udev->children[i]); | |
1550 | } | |
1551 | ||
1552 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1553 | * cleaning up all state associated with the current configuration | |
1554 | * so that the hardware is now fully quiesced. | |
1555 | */ | |
782da727 | 1556 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 1557 | usb_disable_device(udev, 0); |
cde217a5 | 1558 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 1559 | |
3b23dd6f | 1560 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
1561 | usb_unlock_device(udev); |
1562 | ||
1563 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
1564 | * for de-configuring the device and invoking the remove-device |
1565 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
1566 | */ |
1567 | device_del(&udev->dev); | |
3099e75a | 1568 | |
782da727 | 1569 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1570 | * (or root_hub) pointer. |
1571 | */ | |
1da177e4 | 1572 | release_address(udev); |
1da177e4 LT |
1573 | |
1574 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1575 | spin_lock_irq(&device_state_lock); | |
1576 | *pdev = NULL; | |
1577 | spin_unlock_irq(&device_state_lock); | |
1578 | ||
d5d4db70 | 1579 | usb_stop_pm(udev); |
ee49fb5d | 1580 | |
782da727 | 1581 | put_device(&udev->dev); |
1da177e4 LT |
1582 | } |
1583 | ||
f2a383e4 | 1584 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
1585 | static void show_string(struct usb_device *udev, char *id, char *string) |
1586 | { | |
1587 | if (!string) | |
1588 | return; | |
1589 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1590 | } | |
1591 | ||
f2a383e4 GKH |
1592 | static void announce_device(struct usb_device *udev) |
1593 | { | |
1594 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
1595 | le16_to_cpu(udev->descriptor.idVendor), | |
1596 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
1597 | dev_info(&udev->dev, |
1598 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
1599 | udev->descriptor.iManufacturer, |
1600 | udev->descriptor.iProduct, | |
1601 | udev->descriptor.iSerialNumber); | |
1602 | show_string(udev, "Product", udev->product); | |
1603 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1604 | show_string(udev, "SerialNumber", udev->serial); | |
1605 | } | |
1da177e4 | 1606 | #else |
f2a383e4 | 1607 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
1608 | #endif |
1609 | ||
1da177e4 LT |
1610 | #ifdef CONFIG_USB_OTG |
1611 | #include "otg_whitelist.h" | |
1612 | #endif | |
1613 | ||
3ede760f | 1614 | /** |
d9d16e8a | 1615 | * usb_configure_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1616 | * @udev: newly addressed device (in ADDRESS state) |
1617 | * | |
d9d16e8a | 1618 | * Do configuration for On-The-Go devices |
3ede760f | 1619 | */ |
d9d16e8a | 1620 | static int usb_configure_device_otg(struct usb_device *udev) |
1da177e4 | 1621 | { |
d9d16e8a | 1622 | int err = 0; |
1da177e4 LT |
1623 | |
1624 | #ifdef CONFIG_USB_OTG | |
1625 | /* | |
1626 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1627 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1628 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1629 | */ | |
1630 | if (!udev->bus->is_b_host | |
1631 | && udev->config | |
1632 | && udev->parent == udev->bus->root_hub) { | |
1633 | struct usb_otg_descriptor *desc = 0; | |
1634 | struct usb_bus *bus = udev->bus; | |
1635 | ||
1636 | /* descriptor may appear anywhere in config */ | |
1637 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1638 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1639 | USB_DT_OTG, (void **) &desc) == 0) { | |
1640 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1641 | unsigned port1 = udev->portnum; |
fc849b85 | 1642 | |
1da177e4 LT |
1643 | dev_info(&udev->dev, |
1644 | "Dual-Role OTG device on %sHNP port\n", | |
1645 | (port1 == bus->otg_port) | |
1646 | ? "" : "non-"); | |
1647 | ||
1648 | /* enable HNP before suspend, it's simpler */ | |
1649 | if (port1 == bus->otg_port) | |
1650 | bus->b_hnp_enable = 1; | |
1651 | err = usb_control_msg(udev, | |
1652 | usb_sndctrlpipe(udev, 0), | |
1653 | USB_REQ_SET_FEATURE, 0, | |
1654 | bus->b_hnp_enable | |
1655 | ? USB_DEVICE_B_HNP_ENABLE | |
1656 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1657 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1658 | if (err < 0) { | |
1659 | /* OTG MESSAGE: report errors here, | |
1660 | * customize to match your product. | |
1661 | */ | |
1662 | dev_info(&udev->dev, | |
b9cef6c3 | 1663 | "can't set HNP mode: %d\n", |
1da177e4 LT |
1664 | err); |
1665 | bus->b_hnp_enable = 0; | |
1666 | } | |
1667 | } | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | if (!is_targeted(udev)) { | |
1672 | ||
1673 | /* Maybe it can talk to us, though we can't talk to it. | |
1674 | * (Includes HNP test device.) | |
1675 | */ | |
1676 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 1677 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
1678 | if (err < 0) |
1679 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1680 | } | |
ffcdc18d | 1681 | err = -ENOTSUPP; |
1da177e4 LT |
1682 | goto fail; |
1683 | } | |
d9d16e8a | 1684 | fail: |
1da177e4 | 1685 | #endif |
d9d16e8a IPG |
1686 | return err; |
1687 | } | |
1688 | ||
1689 | ||
1690 | /** | |
1691 | * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) | |
1692 | * @udev: newly addressed device (in ADDRESS state) | |
1693 | * | |
1694 | * This is only called by usb_new_device() and usb_authorize_device() | |
1695 | * and FIXME -- all comments that apply to them apply here wrt to | |
1696 | * environment. | |
1697 | * | |
1698 | * If the device is WUSB and not authorized, we don't attempt to read | |
1699 | * the string descriptors, as they will be errored out by the device | |
1700 | * until it has been authorized. | |
1701 | */ | |
1702 | static int usb_configure_device(struct usb_device *udev) | |
1703 | { | |
1704 | int err; | |
1da177e4 | 1705 | |
d9d16e8a IPG |
1706 | if (udev->config == NULL) { |
1707 | err = usb_get_configuration(udev); | |
1708 | if (err < 0) { | |
1709 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1710 | err); | |
1711 | goto fail; | |
1712 | } | |
1713 | } | |
1714 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1715 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1716 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1717 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1718 | } | |
1719 | else { | |
1720 | /* read the standard strings and cache them if present */ | |
1721 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1722 | udev->manufacturer = usb_cache_string(udev, | |
1723 | udev->descriptor.iManufacturer); | |
1724 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1725 | } | |
1726 | err = usb_configure_device_otg(udev); | |
1727 | fail: | |
1728 | return err; | |
1729 | } | |
1730 | ||
1731 | ||
1732 | /** | |
1733 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1734 | * @udev: newly addressed device (in ADDRESS state) | |
1735 | * | |
1736 | * This is called with devices which have been enumerated, but not yet | |
1737 | * configured. The device descriptor is available, but not descriptors | |
1738 | * for any device configuration. The caller must have locked either | |
1739 | * the parent hub (if udev is a normal device) or else the | |
1740 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1741 | * udev has already been installed, but udev is not yet visible through | |
1742 | * sysfs or other filesystem code. | |
1743 | * | |
1744 | * It will return if the device is configured properly or not. Zero if | |
1745 | * the interface was registered with the driver core; else a negative | |
1746 | * errno value. | |
1747 | * | |
1748 | * This call is synchronous, and may not be used in an interrupt context. | |
1749 | * | |
1750 | * Only the hub driver or root-hub registrar should ever call this. | |
1751 | */ | |
1752 | int usb_new_device(struct usb_device *udev) | |
1753 | { | |
1754 | int err; | |
1755 | ||
6cd13201 AS |
1756 | /* Increment the parent's count of unsuspended children */ |
1757 | if (udev->parent) | |
1758 | usb_autoresume_device(udev->parent); | |
1759 | ||
d9d16e8a IPG |
1760 | usb_detect_quirks(udev); /* Determine quirks */ |
1761 | err = usb_configure_device(udev); /* detect & probe dev/intfs */ | |
1762 | if (err < 0) | |
1763 | goto fail; | |
c6515272 SS |
1764 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
1765 | udev->devnum, udev->bus->busnum, | |
1766 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
1767 | /* export the usbdev device-node for libusb */ |
1768 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1769 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1770 | ||
6cd13201 AS |
1771 | /* Tell the world! */ |
1772 | announce_device(udev); | |
195af2cc | 1773 | |
782da727 | 1774 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
1775 | * for configuring the device and invoking the add-device |
1776 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 1777 | */ |
9f8b17e6 | 1778 | err = device_add(&udev->dev); |
1da177e4 LT |
1779 | if (err) { |
1780 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1781 | goto fail; | |
1782 | } | |
9ad3d6cc | 1783 | |
3b23dd6f | 1784 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c066475e | 1785 | return err; |
1da177e4 LT |
1786 | |
1787 | fail: | |
1788 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
6cd13201 | 1789 | usb_stop_pm(udev); |
d9d16e8a | 1790 | return err; |
1da177e4 LT |
1791 | } |
1792 | ||
93993a0a IPG |
1793 | |
1794 | /** | |
fd39c86b RD |
1795 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
1796 | * @usb_dev: USB device | |
1797 | * | |
1798 | * Move the USB device to a very basic state where interfaces are disabled | |
1799 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
1800 | * |
1801 | * We share a lock (that we have) with device_del(), so we need to | |
1802 | * defer its call. | |
1803 | */ | |
1804 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1805 | { | |
1806 | unsigned cnt; | |
1807 | usb_lock_device(usb_dev); | |
1808 | if (usb_dev->authorized == 0) | |
1809 | goto out_unauthorized; | |
1810 | usb_dev->authorized = 0; | |
1811 | usb_set_configuration(usb_dev, -1); | |
1812 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1813 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1814 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1815 | kfree(usb_dev->config); | |
1816 | usb_dev->config = NULL; | |
1817 | for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) | |
1818 | kfree(usb_dev->rawdescriptors[cnt]); | |
1819 | usb_dev->descriptor.bNumConfigurations = 0; | |
1820 | kfree(usb_dev->rawdescriptors); | |
1821 | out_unauthorized: | |
1822 | usb_unlock_device(usb_dev); | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | ||
1827 | int usb_authorize_device(struct usb_device *usb_dev) | |
1828 | { | |
1829 | int result = 0, c; | |
1830 | usb_lock_device(usb_dev); | |
1831 | if (usb_dev->authorized == 1) | |
1832 | goto out_authorized; | |
1833 | kfree(usb_dev->product); | |
1834 | usb_dev->product = NULL; | |
1835 | kfree(usb_dev->manufacturer); | |
1836 | usb_dev->manufacturer = NULL; | |
1837 | kfree(usb_dev->serial); | |
1838 | usb_dev->serial = NULL; | |
1839 | result = usb_autoresume_device(usb_dev); | |
1840 | if (result < 0) { | |
1841 | dev_err(&usb_dev->dev, | |
1842 | "can't autoresume for authorization: %d\n", result); | |
1843 | goto error_autoresume; | |
1844 | } | |
1845 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1846 | if (result < 0) { | |
1847 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1848 | "authorization: %d\n", result); | |
1849 | goto error_device_descriptor; | |
1850 | } | |
1851 | usb_dev->authorized = 1; | |
1852 | result = usb_configure_device(usb_dev); | |
1853 | if (result < 0) | |
1854 | goto error_configure; | |
1855 | /* Choose and set the configuration. This registers the interfaces | |
1856 | * with the driver core and lets interface drivers bind to them. | |
1857 | */ | |
b5ea060f | 1858 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
1859 | if (c >= 0) { |
1860 | result = usb_set_configuration(usb_dev, c); | |
1861 | if (result) { | |
1862 | dev_err(&usb_dev->dev, | |
1863 | "can't set config #%d, error %d\n", c, result); | |
1864 | /* This need not be fatal. The user can try to | |
1865 | * set other configurations. */ | |
1866 | } | |
1867 | } | |
1868 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
1869 | error_configure: | |
1870 | error_device_descriptor: | |
1871 | error_autoresume: | |
1872 | out_authorized: | |
1873 | usb_unlock_device(usb_dev); // complements locktree | |
1874 | return result; | |
1875 | } | |
1876 | ||
1877 | ||
0165de09 IPG |
1878 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
1879 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1880 | { | |
1881 | struct usb_hcd *hcd; | |
1882 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1883 | return 0; | |
1884 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1885 | return hcd->wireless; | |
1886 | } | |
1887 | ||
1888 | ||
1da177e4 LT |
1889 | #define PORT_RESET_TRIES 5 |
1890 | #define SET_ADDRESS_TRIES 2 | |
1891 | #define GET_DESCRIPTOR_TRIES 2 | |
1892 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1893 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1894 | ||
1895 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1896 | #define HUB_SHORT_RESET_TIME 10 | |
1897 | #define HUB_LONG_RESET_TIME 200 | |
1898 | #define HUB_RESET_TIMEOUT 500 | |
1899 | ||
1900 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1901 | struct usb_device *udev, unsigned int delay) | |
1902 | { | |
1903 | int delay_time, ret; | |
1904 | u16 portstatus; | |
1905 | u16 portchange; | |
1906 | ||
1907 | for (delay_time = 0; | |
1908 | delay_time < HUB_RESET_TIMEOUT; | |
1909 | delay_time += delay) { | |
1910 | /* wait to give the device a chance to reset */ | |
1911 | msleep(delay); | |
1912 | ||
1913 | /* read and decode port status */ | |
1914 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1915 | if (ret < 0) | |
1916 | return ret; | |
1917 | ||
1918 | /* Device went away? */ | |
1919 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1920 | return -ENOTCONN; | |
1921 | ||
dd4dd19e | 1922 | /* bomb out completely if the connection bounced */ |
1da177e4 | 1923 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
dd4dd19e | 1924 | return -ENOTCONN; |
1da177e4 LT |
1925 | |
1926 | /* if we`ve finished resetting, then break out of the loop */ | |
1927 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1928 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 IPG |
1929 | if (hub_is_wusb(hub)) |
1930 | udev->speed = USB_SPEED_VARIABLE; | |
1931 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
1da177e4 LT |
1932 | udev->speed = USB_SPEED_HIGH; |
1933 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1934 | udev->speed = USB_SPEED_LOW; | |
1935 | else | |
1936 | udev->speed = USB_SPEED_FULL; | |
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | /* switch to the long delay after two short delay failures */ | |
1941 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1942 | delay = HUB_LONG_RESET_TIME; | |
1943 | ||
1944 | dev_dbg (hub->intfdev, | |
1945 | "port %d not reset yet, waiting %dms\n", | |
1946 | port1, delay); | |
1947 | } | |
1948 | ||
1949 | return -EBUSY; | |
1950 | } | |
1951 | ||
1952 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
1953 | struct usb_device *udev, unsigned int delay) | |
1954 | { | |
1955 | int i, status; | |
1956 | ||
32fe0198 AS |
1957 | /* Block EHCI CF initialization during the port reset. |
1958 | * Some companion controllers don't like it when they mix. | |
1959 | */ | |
1960 | down_read(&ehci_cf_port_reset_rwsem); | |
1961 | ||
1da177e4 LT |
1962 | /* Reset the port */ |
1963 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
1964 | status = set_port_feature(hub->hdev, | |
1965 | port1, USB_PORT_FEAT_RESET); | |
1966 | if (status) | |
1967 | dev_err(hub->intfdev, | |
1968 | "cannot reset port %d (err = %d)\n", | |
1969 | port1, status); | |
1970 | else { | |
1971 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 1972 | if (status && status != -ENOTCONN) |
1da177e4 LT |
1973 | dev_dbg(hub->intfdev, |
1974 | "port_wait_reset: err = %d\n", | |
1975 | status); | |
1976 | } | |
1977 | ||
1978 | /* return on disconnect or reset */ | |
1979 | switch (status) { | |
1980 | case 0: | |
b789696a DB |
1981 | /* TRSTRCY = 10 ms; plus some extra */ |
1982 | msleep(10 + 40); | |
4953d141 | 1983 | update_address(udev, 0); |
1da177e4 LT |
1984 | /* FALL THROUGH */ |
1985 | case -ENOTCONN: | |
1986 | case -ENODEV: | |
1987 | clear_port_feature(hub->hdev, | |
1988 | port1, USB_PORT_FEAT_C_RESET); | |
1989 | /* FIXME need disconnect() for NOTATTACHED device */ | |
1990 | usb_set_device_state(udev, status | |
1991 | ? USB_STATE_NOTATTACHED | |
1992 | : USB_STATE_DEFAULT); | |
32fe0198 | 1993 | goto done; |
1da177e4 LT |
1994 | } |
1995 | ||
1996 | dev_dbg (hub->intfdev, | |
1997 | "port %d not enabled, trying reset again...\n", | |
1998 | port1); | |
1999 | delay = HUB_LONG_RESET_TIME; | |
2000 | } | |
2001 | ||
2002 | dev_err (hub->intfdev, | |
2003 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
2004 | port1); | |
2005 | ||
32fe0198 AS |
2006 | done: |
2007 | up_read(&ehci_cf_port_reset_rwsem); | |
1da177e4 LT |
2008 | return status; |
2009 | } | |
2010 | ||
d388dab7 | 2011 | #ifdef CONFIG_PM |
1da177e4 | 2012 | |
b01b03f3 AS |
2013 | #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ |
2014 | USB_PORT_STAT_SUSPEND) | |
2015 | #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) | |
2016 | ||
2017 | /* Determine whether the device on a port is ready for a normal resume, | |
2018 | * is ready for a reset-resume, or should be disconnected. | |
2019 | */ | |
2020 | static int check_port_resume_type(struct usb_device *udev, | |
2021 | struct usb_hub *hub, int port1, | |
2022 | int status, unsigned portchange, unsigned portstatus) | |
2023 | { | |
2024 | /* Is the device still present? */ | |
2025 | if (status || (portstatus & MASK_BITS) != WANT_BITS) { | |
2026 | if (status >= 0) | |
2027 | status = -ENODEV; | |
2028 | } | |
2029 | ||
86c57edf AS |
2030 | /* Can't do a normal resume if the port isn't enabled, |
2031 | * so try a reset-resume instead. | |
2032 | */ | |
2033 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2034 | if (udev->persist_enabled) | |
2035 | udev->reset_resume = 1; | |
2036 | else | |
2037 | status = -ENODEV; | |
2038 | } | |
b01b03f3 AS |
2039 | |
2040 | if (status) { | |
2041 | dev_dbg(hub->intfdev, | |
2042 | "port %d status %04x.%04x after resume, %d\n", | |
2043 | port1, portchange, portstatus, status); | |
2044 | } else if (udev->reset_resume) { | |
2045 | ||
2046 | /* Late port handoff can set status-change bits */ | |
2047 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
2048 | clear_port_feature(hub->hdev, port1, | |
2049 | USB_PORT_FEAT_C_CONNECTION); | |
2050 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
2051 | clear_port_feature(hub->hdev, port1, | |
2052 | USB_PORT_FEAT_C_ENABLE); | |
2053 | } | |
2054 | ||
2055 | return status; | |
2056 | } | |
2057 | ||
1da177e4 LT |
2058 | #ifdef CONFIG_USB_SUSPEND |
2059 | ||
2060 | /* | |
624d6c07 AS |
2061 | * usb_port_suspend - suspend a usb device's upstream port |
2062 | * @udev: device that's no longer in active use, not a root hub | |
2063 | * Context: must be able to sleep; device not locked; pm locks held | |
2064 | * | |
2065 | * Suspends a USB device that isn't in active use, conserving power. | |
2066 | * Devices may wake out of a suspend, if anything important happens, | |
2067 | * using the remote wakeup mechanism. They may also be taken out of | |
2068 | * suspend by the host, using usb_port_resume(). It's also routine | |
2069 | * to disconnect devices while they are suspended. | |
2070 | * | |
2071 | * This only affects the USB hardware for a device; its interfaces | |
2072 | * (and, for hubs, child devices) must already have been suspended. | |
2073 | * | |
1da177e4 LT |
2074 | * Selective port suspend reduces power; most suspended devices draw |
2075 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
2076 | * All devices below the suspended port are also suspended. | |
2077 | * | |
2078 | * Devices leave suspend state when the host wakes them up. Some devices | |
2079 | * also support "remote wakeup", where the device can activate the USB | |
2080 | * tree above them to deliver data, such as a keypress or packet. In | |
2081 | * some cases, this wakes the USB host. | |
624d6c07 AS |
2082 | * |
2083 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
2084 | * between a pair of dual-role devices. That will change roles, such | |
2085 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
2086 | * | |
2087 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
2088 | * to ACPI D2, "may cause the device to lose some context". | |
2089 | * State transitions include: | |
2090 | * | |
2091 | * - suspend, resume ... when the VBUS power link stays live | |
2092 | * - suspend, disconnect ... VBUS lost | |
2093 | * | |
2094 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
2095 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
2096 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2097 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2098 | * timer, no SRP, no requests through sysfs. | |
2099 | * | |
2100 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
2101 | * the root hub for their bus goes into global suspend ... so we don't | |
2102 | * (falsely) update the device power state to say it suspended. | |
2103 | * | |
2104 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2105 | */ |
65bfd296 | 2106 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2107 | { |
624d6c07 AS |
2108 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2109 | int port1 = udev->portnum; | |
2110 | int status; | |
1da177e4 LT |
2111 | |
2112 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
2113 | ||
2114 | /* enable remote wakeup when appropriate; this lets the device | |
2115 | * wake up the upstream hub (including maybe the root hub). | |
2116 | * | |
2117 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2118 | * we don't explicitly enable it here. | |
2119 | */ | |
645daaab | 2120 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
2121 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
2122 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2123 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2124 | NULL, 0, | |
2125 | USB_CTRL_SET_TIMEOUT); | |
2126 | if (status) | |
624d6c07 AS |
2127 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2128 | status); | |
1da177e4 LT |
2129 | } |
2130 | ||
2131 | /* see 7.1.7.6 */ | |
2132 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
2133 | if (status) { | |
624d6c07 AS |
2134 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
2135 | port1, status); | |
1da177e4 LT |
2136 | /* paranoia: "should not happen" */ |
2137 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2138 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2139 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2140 | NULL, 0, | |
2141 | USB_CTRL_SET_TIMEOUT); | |
2142 | } else { | |
2143 | /* device has up to 10 msec to fully suspend */ | |
645daaab | 2144 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
65bfd296 | 2145 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2146 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
2147 | msleep(10); | |
2148 | } | |
2149 | return status; | |
2150 | } | |
2151 | ||
1da177e4 | 2152 | /* |
390a8c34 DB |
2153 | * If the USB "suspend" state is in use (rather than "global suspend"), |
2154 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 2155 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
2156 | * hardware resume signaling is finished, either because of selective |
2157 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
2158 | * in the tree that's rooted at this device. | |
54515fe5 AS |
2159 | * |
2160 | * If @udev->reset_resume is set then the device is reset before the | |
2161 | * status check is done. | |
1da177e4 | 2162 | */ |
140d8f68 | 2163 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 2164 | { |
54515fe5 | 2165 | int status = 0; |
1da177e4 LT |
2166 | u16 devstatus; |
2167 | ||
2168 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
2169 | dev_dbg(&udev->dev, "%s\n", |
2170 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
2171 | |
2172 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
2173 | * state the device resumes to. Linux currently won't see the | |
2174 | * first two on the host side; they'd be inside hub_port_init() | |
2175 | * during many timeouts, but khubd can't suspend until later. | |
2176 | */ | |
2177 | usb_set_device_state(udev, udev->actconfig | |
2178 | ? USB_STATE_CONFIGURED | |
2179 | : USB_STATE_ADDRESS); | |
1da177e4 | 2180 | |
54515fe5 AS |
2181 | /* 10.5.4.5 says not to reset a suspended port if the attached |
2182 | * device is enabled for remote wakeup. Hence the reset | |
2183 | * operation is carried out here, after the port has been | |
2184 | * resumed. | |
2185 | */ | |
2186 | if (udev->reset_resume) | |
86c57edf | 2187 | retry_reset_resume: |
742120c6 | 2188 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 2189 | |
1da177e4 LT |
2190 | /* 10.5.4.5 says be sure devices in the tree are still there. |
2191 | * For now let's assume the device didn't go crazy on resume, | |
2192 | * and device drivers will know about any resume quirks. | |
2193 | */ | |
54515fe5 | 2194 | if (status == 0) { |
46dede46 | 2195 | devstatus = 0; |
54515fe5 AS |
2196 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
2197 | if (status >= 0) | |
46dede46 | 2198 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
2199 | |
2200 | /* If a normal resume failed, try doing a reset-resume */ | |
2201 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
2202 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
2203 | udev->reset_resume = 1; | |
2204 | goto retry_reset_resume; | |
2205 | } | |
54515fe5 | 2206 | } |
b40b7a90 | 2207 | |
624d6c07 AS |
2208 | if (status) { |
2209 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
2210 | status); | |
2211 | } else if (udev->actconfig) { | |
1da177e4 | 2212 | le16_to_cpus(&devstatus); |
686314cf | 2213 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
2214 | status = usb_control_msg(udev, |
2215 | usb_sndctrlpipe(udev, 0), | |
2216 | USB_REQ_CLEAR_FEATURE, | |
2217 | USB_RECIP_DEVICE, | |
2218 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2219 | NULL, 0, | |
2220 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 2221 | if (status) |
b9cef6c3 WF |
2222 | dev_dbg(&udev->dev, |
2223 | "disable remote wakeup, status %d\n", | |
2224 | status); | |
4bf0ba86 | 2225 | } |
1da177e4 | 2226 | status = 0; |
1da177e4 LT |
2227 | } |
2228 | return status; | |
2229 | } | |
2230 | ||
624d6c07 AS |
2231 | /* |
2232 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
2233 | * @udev: device to re-activate, not a root hub | |
2234 | * Context: must be able to sleep; device not locked; pm locks held | |
2235 | * | |
2236 | * This will re-activate the suspended device, increasing power usage | |
2237 | * while letting drivers communicate again with its endpoints. | |
2238 | * USB resume explicitly guarantees that the power session between | |
2239 | * the host and the device is the same as it was when the device | |
2240 | * suspended. | |
2241 | * | |
feccc30d AS |
2242 | * If @udev->reset_resume is set then this routine won't check that the |
2243 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
2244 | * reset @udev. The end result is that a broken power session can be |
2245 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
2246 | * | |
2247 | * For example, if a host controller doesn't maintain VBUS suspend current | |
2248 | * during a system sleep or is reset when the system wakes up, all the USB | |
2249 | * power sessions below it will be broken. This is especially troublesome | |
2250 | * for mass-storage devices containing mounted filesystems, since the | |
2251 | * device will appear to have disconnected and all the memory mappings | |
2252 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
2253 | * made to appear as if it had not disconnected. | |
2254 | * | |
742120c6 | 2255 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 2256 | * every effort to insure that the same device is present after the |
54515fe5 AS |
2257 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
2258 | * quite possible for a device to remain unaltered but its media to be | |
2259 | * changed. If the user replaces a flash memory card while the system is | |
2260 | * asleep, he will have only himself to blame when the filesystem on the | |
2261 | * new card is corrupted and the system crashes. | |
2262 | * | |
624d6c07 AS |
2263 | * Returns 0 on success, else negative errno. |
2264 | */ | |
65bfd296 | 2265 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2266 | { |
624d6c07 AS |
2267 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2268 | int port1 = udev->portnum; | |
2269 | int status; | |
2270 | u16 portchange, portstatus; | |
d25450c6 AS |
2271 | |
2272 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
2273 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2274 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
2275 | goto SuspendCleared; | |
1da177e4 LT |
2276 | |
2277 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
2278 | ||
d5cbad4b AS |
2279 | set_bit(port1, hub->busy_bits); |
2280 | ||
1da177e4 LT |
2281 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
2282 | status = clear_port_feature(hub->hdev, | |
2283 | port1, USB_PORT_FEAT_SUSPEND); | |
2284 | if (status) { | |
624d6c07 AS |
2285 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
2286 | port1, status); | |
1da177e4 | 2287 | } else { |
1da177e4 | 2288 | /* drive resume for at least 20 msec */ |
686314cf | 2289 | dev_dbg(&udev->dev, "usb %sresume\n", |
65bfd296 | 2290 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2291 | msleep(25); |
2292 | ||
1da177e4 LT |
2293 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
2294 | * stop resume signaling. Then finish the resume | |
2295 | * sequence. | |
2296 | */ | |
d25450c6 | 2297 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 2298 | |
b01b03f3 AS |
2299 | /* TRSMRCY = 10 msec */ |
2300 | msleep(10); | |
2301 | } | |
2302 | ||
54515fe5 | 2303 | SuspendCleared: |
b01b03f3 AS |
2304 | if (status == 0) { |
2305 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
2306 | clear_port_feature(hub->hdev, port1, | |
2307 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 | 2308 | } |
1da177e4 | 2309 | |
d5cbad4b | 2310 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 2311 | |
b01b03f3 AS |
2312 | status = check_port_resume_type(udev, |
2313 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
2314 | if (status == 0) |
2315 | status = finish_port_resume(udev); | |
2316 | if (status < 0) { | |
2317 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2318 | hub_port_logical_disconnect(hub, port1); | |
2319 | } | |
1da177e4 LT |
2320 | return status; |
2321 | } | |
2322 | ||
8808f00c | 2323 | /* caller has locked udev */ |
1da177e4 LT |
2324 | static int remote_wakeup(struct usb_device *udev) |
2325 | { | |
2326 | int status = 0; | |
2327 | ||
1da177e4 | 2328 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 2329 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
1941044a | 2330 | usb_mark_last_busy(udev); |
65bfd296 | 2331 | status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME); |
1da177e4 | 2332 | } |
1da177e4 LT |
2333 | return status; |
2334 | } | |
2335 | ||
d388dab7 AS |
2336 | #else /* CONFIG_USB_SUSPEND */ |
2337 | ||
2338 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
2339 | ||
65bfd296 | 2340 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
d388dab7 AS |
2341 | { |
2342 | return 0; | |
2343 | } | |
2344 | ||
b01b03f3 AS |
2345 | /* However we may need to do a reset-resume */ |
2346 | ||
65bfd296 | 2347 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
d388dab7 | 2348 | { |
b01b03f3 AS |
2349 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2350 | int port1 = udev->portnum; | |
2351 | int status; | |
2352 | u16 portchange, portstatus; | |
2353 | ||
2354 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2355 | status = check_port_resume_type(udev, | |
2356 | hub, port1, status, portchange, portstatus); | |
54515fe5 | 2357 | |
b01b03f3 AS |
2358 | if (status) { |
2359 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2360 | hub_port_logical_disconnect(hub, port1); | |
2361 | } else if (udev->reset_resume) { | |
54515fe5 | 2362 | dev_dbg(&udev->dev, "reset-resume\n"); |
742120c6 | 2363 | status = usb_reset_and_verify_device(udev); |
54515fe5 AS |
2364 | } |
2365 | return status; | |
d388dab7 AS |
2366 | } |
2367 | ||
2368 | static inline int remote_wakeup(struct usb_device *udev) | |
2369 | { | |
2370 | return 0; | |
2371 | } | |
2372 | ||
2373 | #endif | |
2374 | ||
db690874 | 2375 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
2376 | { |
2377 | struct usb_hub *hub = usb_get_intfdata (intf); | |
2378 | struct usb_device *hdev = hub->hdev; | |
2379 | unsigned port1; | |
1da177e4 | 2380 | |
c9f89fa4 | 2381 | /* fail if children aren't already suspended */ |
1da177e4 LT |
2382 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2383 | struct usb_device *udev; | |
2384 | ||
2385 | udev = hdev->children [port1-1]; | |
6840d255 | 2386 | if (udev && udev->can_submit) { |
65bfd296 | 2387 | if (!(msg.event & PM_EVENT_AUTO)) |
645daaab AS |
2388 | dev_dbg(&intf->dev, "port %d nyet suspended\n", |
2389 | port1); | |
c9f89fa4 DB |
2390 | return -EBUSY; |
2391 | } | |
1da177e4 LT |
2392 | } |
2393 | ||
441b62c1 | 2394 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 2395 | |
12f1ff83 | 2396 | /* stop khubd and related activity */ |
4330354f | 2397 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 2398 | return 0; |
1da177e4 LT |
2399 | } |
2400 | ||
2401 | static int hub_resume(struct usb_interface *intf) | |
2402 | { | |
5e6effae | 2403 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 2404 | |
5e6effae | 2405 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2406 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
2407 | return 0; |
2408 | } | |
2409 | ||
b41a60ec | 2410 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 2411 | { |
b41a60ec | 2412 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 2413 | |
5e6effae | 2414 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2415 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
2416 | return 0; |
2417 | } | |
2418 | ||
54515fe5 AS |
2419 | /** |
2420 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2421 | * @rhdev: struct usb_device for the root hub | |
2422 | * | |
2423 | * The USB host controller driver calls this function when its root hub | |
2424 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
2425 | * has been reset. The routine marks @rhdev as having lost power. |
2426 | * When the hub driver is resumed it will take notice and carry out | |
2427 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
2428 | * the others will be disconnected. | |
54515fe5 AS |
2429 | */ |
2430 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2431 | { | |
2432 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2433 | rhdev->reset_resume = 1; | |
2434 | } | |
2435 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2436 | ||
d388dab7 AS |
2437 | #else /* CONFIG_PM */ |
2438 | ||
2439 | static inline int remote_wakeup(struct usb_device *udev) | |
2440 | { | |
2441 | return 0; | |
2442 | } | |
2443 | ||
f07600cf AS |
2444 | #define hub_suspend NULL |
2445 | #define hub_resume NULL | |
2446 | #define hub_reset_resume NULL | |
d388dab7 AS |
2447 | #endif |
2448 | ||
1da177e4 LT |
2449 | |
2450 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2451 | * | |
2452 | * Between connect detection and reset signaling there must be a delay | |
2453 | * of 100ms at least for debounce and power-settling. The corresponding | |
2454 | * timer shall restart whenever the downstream port detects a disconnect. | |
2455 | * | |
2456 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2457 | * low-speed devices for which this debounce period may last over a second. | |
2458 | * Not covered by the spec - but easy to deal with. | |
2459 | * | |
2460 | * This implementation uses a 1500ms total debounce timeout; if the | |
2461 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2462 | * every 25ms for transient disconnects. When the port status has been | |
2463 | * unchanged for 100ms it returns the port status. | |
2464 | */ | |
1da177e4 LT |
2465 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
2466 | { | |
2467 | int ret; | |
2468 | int total_time, stable_time = 0; | |
2469 | u16 portchange, portstatus; | |
2470 | unsigned connection = 0xffff; | |
2471 | ||
2472 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2473 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2474 | if (ret < 0) | |
2475 | return ret; | |
2476 | ||
2477 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2478 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2479 | stable_time += HUB_DEBOUNCE_STEP; | |
2480 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2481 | break; | |
2482 | } else { | |
2483 | stable_time = 0; | |
2484 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2485 | } | |
2486 | ||
2487 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2488 | clear_port_feature(hub->hdev, port1, | |
2489 | USB_PORT_FEAT_C_CONNECTION); | |
2490 | } | |
2491 | ||
2492 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2493 | break; | |
2494 | msleep(HUB_DEBOUNCE_STEP); | |
2495 | } | |
2496 | ||
2497 | dev_dbg (hub->intfdev, | |
2498 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2499 | port1, total_time, stable_time, portstatus); | |
2500 | ||
2501 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2502 | return -ETIMEDOUT; | |
2503 | return portstatus; | |
2504 | } | |
2505 | ||
fc721f51 | 2506 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 2507 | { |
ddeac4e7 AS |
2508 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
2509 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 2510 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 2511 | } |
fc721f51 | 2512 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
2513 | |
2514 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2515 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2516 | ||
4326ed0b | 2517 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2518 | { |
2519 | int retval; | |
c6515272 | 2520 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2521 | |
c6515272 SS |
2522 | /* |
2523 | * The host controller will choose the device address, | |
2524 | * instead of the core having chosen it earlier | |
2525 | */ | |
2526 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
2527 | return -EINVAL; |
2528 | if (udev->state == USB_STATE_ADDRESS) | |
2529 | return 0; | |
2530 | if (udev->state != USB_STATE_DEFAULT) | |
2531 | return -EINVAL; | |
c6515272 SS |
2532 | if (hcd->driver->address_device) { |
2533 | retval = hcd->driver->address_device(hcd, udev); | |
2534 | } else { | |
2535 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), | |
2536 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
2537 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2538 | if (retval == 0) | |
2539 | update_address(udev, devnum); | |
2540 | } | |
1da177e4 | 2541 | if (retval == 0) { |
4953d141 | 2542 | /* Device now using proper address. */ |
1da177e4 | 2543 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 2544 | usb_ep0_reinit(udev); |
1da177e4 LT |
2545 | } |
2546 | return retval; | |
2547 | } | |
2548 | ||
2549 | /* Reset device, (re)assign address, get device descriptor. | |
2550 | * Device connection must be stable, no more debouncing needed. | |
2551 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2552 | * | |
2553 | * If this is called for an already-existing device (as part of | |
742120c6 | 2554 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
2555 | * newly detected device that is not accessible through any global |
2556 | * pointers, it's not necessary to lock the device. | |
2557 | */ | |
2558 | static int | |
2559 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2560 | int retry_counter) | |
2561 | { | |
4186ecf8 | 2562 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2563 | |
2564 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 2565 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
2566 | int i, j, retval; |
2567 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2568 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2569 | char *speed, *type; |
4326ed0b | 2570 | int devnum = udev->devnum; |
1da177e4 LT |
2571 | |
2572 | /* root hub ports have a slightly longer reset period | |
2573 | * (from USB 2.0 spec, section 7.1.7.5) | |
2574 | */ | |
2575 | if (!hdev->parent) { | |
2576 | delay = HUB_ROOT_RESET_TIME; | |
2577 | if (port1 == hdev->bus->otg_port) | |
2578 | hdev->bus->b_hnp_enable = 0; | |
2579 | } | |
2580 | ||
2581 | /* Some low speed devices have problems with the quick delay, so */ | |
2582 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2583 | if (oldspeed == USB_SPEED_LOW) | |
2584 | delay = HUB_LONG_RESET_TIME; | |
2585 | ||
4186ecf8 | 2586 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 2587 | |
e7b77172 SS |
2588 | if ((hcd->driver->flags & HCD_USB3) && udev->config) { |
2589 | /* FIXME this will need special handling by the xHCI driver. */ | |
2590 | dev_dbg(&udev->dev, | |
2591 | "xHCI reset of configured device " | |
2592 | "not supported yet.\n"); | |
2593 | retval = -EINVAL; | |
1da177e4 | 2594 | goto fail; |
e7b77172 SS |
2595 | } else if (!udev->config && oldspeed == USB_SPEED_SUPER) { |
2596 | /* Don't reset USB 3.0 devices during an initial setup */ | |
2597 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2598 | } else { | |
2599 | /* Reset the device; full speed may morph to high speed */ | |
2600 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
2601 | retval = hub_port_reset(hub, port1, udev, delay); | |
2602 | if (retval < 0) /* error or disconnect */ | |
2603 | goto fail; | |
2604 | /* success, speed is known */ | |
2605 | } | |
1da177e4 LT |
2606 | retval = -ENODEV; |
2607 | ||
2608 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2609 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2610 | goto fail; | |
2611 | } | |
2612 | oldspeed = udev->speed; | |
4326ed0b | 2613 | |
1da177e4 LT |
2614 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2615 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2616 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2617 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2618 | */ |
2619 | switch (udev->speed) { | |
6b403b02 | 2620 | case USB_SPEED_SUPER: |
5bb6e0ae | 2621 | case USB_SPEED_VARIABLE: /* fixed at 512 */ |
551509d2 | 2622 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 2623 | break; |
1da177e4 | 2624 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 2625 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2626 | break; |
2627 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2628 | /* to determine the ep0 maxpacket size, try to read | |
2629 | * the device descriptor to get bMaxPacketSize0 and | |
2630 | * then correct our initial guess. | |
2631 | */ | |
551509d2 | 2632 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2633 | break; |
2634 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 2635 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
2636 | break; |
2637 | default: | |
2638 | goto fail; | |
2639 | } | |
2640 | ||
83a07196 IPG |
2641 | type = ""; |
2642 | switch (udev->speed) { | |
2643 | case USB_SPEED_LOW: speed = "low"; break; | |
2644 | case USB_SPEED_FULL: speed = "full"; break; | |
2645 | case USB_SPEED_HIGH: speed = "high"; break; | |
6b403b02 SS |
2646 | case USB_SPEED_SUPER: |
2647 | speed = "super"; | |
2648 | break; | |
83a07196 IPG |
2649 | case USB_SPEED_VARIABLE: |
2650 | speed = "variable"; | |
2651 | type = "Wireless "; | |
2652 | break; | |
2653 | default: speed = "?"; break; | |
2654 | } | |
c6515272 SS |
2655 | if (udev->speed != USB_SPEED_SUPER) |
2656 | dev_info(&udev->dev, | |
2657 | "%s %s speed %sUSB device using %s and address %d\n", | |
2658 | (udev->config) ? "reset" : "new", speed, type, | |
2659 | udev->bus->controller->driver->name, devnum); | |
1da177e4 LT |
2660 | |
2661 | /* Set up TT records, if needed */ | |
2662 | if (hdev->tt) { | |
2663 | udev->tt = hdev->tt; | |
2664 | udev->ttport = hdev->ttport; | |
2665 | } else if (udev->speed != USB_SPEED_HIGH | |
2666 | && hdev->speed == USB_SPEED_HIGH) { | |
2667 | udev->tt = &hub->tt; | |
2668 | udev->ttport = port1; | |
2669 | } | |
2670 | ||
2671 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2672 | * Because device hardware and firmware is sometimes buggy in | |
2673 | * this area, and this is how Linux has done it for ages. | |
2674 | * Change it cautiously. | |
2675 | * | |
2676 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2677 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2678 | * so it may help with some non-standards-compliant devices. | |
2679 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2680 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2681 | * value. | |
2682 | */ | |
2683 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
c6515272 SS |
2684 | /* |
2685 | * An xHCI controller cannot send any packets to a device until | |
2686 | * a set address command successfully completes. | |
2687 | */ | |
2688 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { | |
1da177e4 LT |
2689 | struct usb_device_descriptor *buf; |
2690 | int r = 0; | |
2691 | ||
2692 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2693 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2694 | if (!buf) { | |
2695 | retval = -ENOMEM; | |
2696 | continue; | |
2697 | } | |
2698 | ||
b89ee19a AS |
2699 | /* Retry on all errors; some devices are flakey. |
2700 | * 255 is for WUSB devices, we actually need to use | |
2701 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2702 | */ |
2703 | for (j = 0; j < 3; ++j) { | |
2704 | buf->bMaxPacketSize0 = 0; | |
2705 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2706 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2707 | USB_DT_DEVICE << 8, 0, | |
2708 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 2709 | initial_descriptor_timeout); |
1da177e4 | 2710 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2711 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2712 | if (buf->bDescriptorType == |
2713 | USB_DT_DEVICE) { | |
2714 | r = 0; | |
2715 | break; | |
2716 | } | |
2717 | /* FALL THROUGH */ | |
2718 | default: | |
2719 | if (r == 0) | |
2720 | r = -EPROTO; | |
2721 | break; | |
2722 | } | |
2723 | if (r == 0) | |
2724 | break; | |
2725 | } | |
2726 | udev->descriptor.bMaxPacketSize0 = | |
2727 | buf->bMaxPacketSize0; | |
2728 | kfree(buf); | |
2729 | ||
2730 | retval = hub_port_reset(hub, port1, udev, delay); | |
2731 | if (retval < 0) /* error or disconnect */ | |
2732 | goto fail; | |
2733 | if (oldspeed != udev->speed) { | |
2734 | dev_dbg(&udev->dev, | |
2735 | "device reset changed speed!\n"); | |
2736 | retval = -ENODEV; | |
2737 | goto fail; | |
2738 | } | |
2739 | if (r) { | |
b9cef6c3 WF |
2740 | dev_err(&udev->dev, |
2741 | "device descriptor read/64, error %d\n", | |
2742 | r); | |
1da177e4 LT |
2743 | retval = -EMSGSIZE; |
2744 | continue; | |
2745 | } | |
2746 | #undef GET_DESCRIPTOR_BUFSIZE | |
2747 | } | |
2748 | ||
6c529cdc IPG |
2749 | /* |
2750 | * If device is WUSB, we already assigned an | |
2751 | * unauthorized address in the Connect Ack sequence; | |
2752 | * authorization will assign the final address. | |
2753 | */ | |
c6515272 | 2754 | if (udev->wusb == 0) { |
6c529cdc IPG |
2755 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
2756 | retval = hub_set_address(udev, devnum); | |
2757 | if (retval >= 0) | |
2758 | break; | |
2759 | msleep(200); | |
2760 | } | |
2761 | if (retval < 0) { | |
2762 | dev_err(&udev->dev, | |
2763 | "device not accepting address %d, error %d\n", | |
2764 | devnum, retval); | |
2765 | goto fail; | |
2766 | } | |
c6515272 SS |
2767 | if (udev->speed == USB_SPEED_SUPER) { |
2768 | devnum = udev->devnum; | |
2769 | dev_info(&udev->dev, | |
2770 | "%s SuperSpeed USB device using %s and address %d\n", | |
2771 | (udev->config) ? "reset" : "new", | |
2772 | udev->bus->controller->driver->name, devnum); | |
2773 | } | |
6c529cdc IPG |
2774 | |
2775 | /* cope with hardware quirkiness: | |
2776 | * - let SET_ADDRESS settle, some device hardware wants it | |
2777 | * - read ep0 maxpacket even for high and low speed, | |
2778 | */ | |
2779 | msleep(10); | |
c6515272 | 2780 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
1da177e4 | 2781 | break; |
6c529cdc | 2782 | } |
1da177e4 LT |
2783 | |
2784 | retval = usb_get_device_descriptor(udev, 8); | |
2785 | if (retval < 8) { | |
b9cef6c3 WF |
2786 | dev_err(&udev->dev, |
2787 | "device descriptor read/8, error %d\n", | |
2788 | retval); | |
1da177e4 LT |
2789 | if (retval >= 0) |
2790 | retval = -EMSGSIZE; | |
2791 | } else { | |
2792 | retval = 0; | |
2793 | break; | |
2794 | } | |
2795 | } | |
2796 | if (retval) | |
2797 | goto fail; | |
2798 | ||
6b403b02 SS |
2799 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
2800 | udev->speed == USB_SPEED_SUPER) | |
2801 | i = 512; | |
2802 | else | |
2803 | i = udev->descriptor.bMaxPacketSize0; | |
1da177e4 LT |
2804 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
2805 | if (udev->speed != USB_SPEED_FULL || | |
2806 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2807 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2808 | retval = -EMSGSIZE; | |
2809 | goto fail; | |
2810 | } | |
2811 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2812 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
fc721f51 | 2813 | usb_ep0_reinit(udev); |
1da177e4 LT |
2814 | } |
2815 | ||
2816 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2817 | if (retval < (signed)sizeof(udev->descriptor)) { | |
b9cef6c3 WF |
2818 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
2819 | retval); | |
1da177e4 LT |
2820 | if (retval >= 0) |
2821 | retval = -ENOMSG; | |
2822 | goto fail; | |
2823 | } | |
2824 | ||
2825 | retval = 0; | |
2826 | ||
2827 | fail: | |
4326ed0b | 2828 | if (retval) { |
1da177e4 | 2829 | hub_port_disable(hub, port1, 0); |
4953d141 | 2830 | update_address(udev, devnum); /* for disconnect processing */ |
4326ed0b | 2831 | } |
4186ecf8 | 2832 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2833 | return retval; |
2834 | } | |
2835 | ||
2836 | static void | |
2837 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2838 | { | |
2839 | struct usb_qualifier_descriptor *qual; | |
2840 | int status; | |
2841 | ||
e94b1766 | 2842 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
2843 | if (qual == NULL) |
2844 | return; | |
2845 | ||
2846 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2847 | qual, sizeof *qual); | |
2848 | if (status == sizeof *qual) { | |
2849 | dev_info(&udev->dev, "not running at top speed; " | |
2850 | "connect to a high speed hub\n"); | |
2851 | /* hub LEDs are probably harder to miss than syslog */ | |
2852 | if (hub->has_indicators) { | |
2853 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2854 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2855 | } |
2856 | } | |
1bc3c9e1 | 2857 | kfree(qual); |
1da177e4 LT |
2858 | } |
2859 | ||
2860 | static unsigned | |
2861 | hub_power_remaining (struct usb_hub *hub) | |
2862 | { | |
2863 | struct usb_device *hdev = hub->hdev; | |
2864 | int remaining; | |
55c52718 | 2865 | int port1; |
1da177e4 | 2866 | |
55c52718 | 2867 | if (!hub->limited_power) |
1da177e4 LT |
2868 | return 0; |
2869 | ||
55c52718 AS |
2870 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2871 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2872 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2873 | int delta; | |
1da177e4 LT |
2874 | |
2875 | if (!udev) | |
2876 | continue; | |
2877 | ||
55c52718 AS |
2878 | /* Unconfigured devices may not use more than 100mA, |
2879 | * or 8mA for OTG ports */ | |
1da177e4 | 2880 | if (udev->actconfig) |
55c52718 AS |
2881 | delta = udev->actconfig->desc.bMaxPower * 2; |
2882 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2883 | delta = 100; | |
1da177e4 | 2884 | else |
55c52718 AS |
2885 | delta = 8; |
2886 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
2887 | dev_warn(&udev->dev, |
2888 | "%dmA is over %umA budget for port %d!\n", | |
2889 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2890 | remaining -= delta; |
2891 | } | |
2892 | if (remaining < 0) { | |
55c52718 AS |
2893 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2894 | - remaining); | |
1da177e4 LT |
2895 | remaining = 0; |
2896 | } | |
2897 | return remaining; | |
2898 | } | |
2899 | ||
2900 | /* Handle physical or logical connection change events. | |
2901 | * This routine is called when: | |
2902 | * a port connection-change occurs; | |
2903 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 2904 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
2905 | * a firmware download) |
2906 | * caller already locked the hub | |
2907 | */ | |
2908 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2909 | u16 portstatus, u16 portchange) | |
2910 | { | |
2911 | struct usb_device *hdev = hub->hdev; | |
2912 | struct device *hub_dev = hub->intfdev; | |
90da096e | 2913 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
2914 | unsigned wHubCharacteristics = |
2915 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 2916 | struct usb_device *udev; |
1da177e4 | 2917 | int status, i; |
24618b0c | 2918 | |
1da177e4 LT |
2919 | dev_dbg (hub_dev, |
2920 | "port %d, status %04x, change %04x, %s\n", | |
2921 | port1, portstatus, portchange, portspeed (portstatus)); | |
2922 | ||
2923 | if (hub->has_indicators) { | |
2924 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2925 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2926 | } | |
1da177e4 LT |
2927 | |
2928 | #ifdef CONFIG_USB_OTG | |
2929 | /* during HNP, don't repeat the debounce */ | |
2930 | if (hdev->bus->is_b_host) | |
24618b0c AS |
2931 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
2932 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
2933 | #endif |
2934 | ||
8808f00c AS |
2935 | /* Try to resuscitate an existing device */ |
2936 | udev = hdev->children[port1-1]; | |
2937 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
2938 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
2939 | usb_lock_device(udev); |
2940 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
2941 | status = 0; /* Nothing to do */ | |
8808f00c AS |
2942 | |
2943 | #ifdef CONFIG_USB_SUSPEND | |
5257d97a AS |
2944 | } else if (udev->state == USB_STATE_SUSPENDED && |
2945 | udev->persist_enabled) { | |
8808f00c AS |
2946 | /* For a suspended device, treat this as a |
2947 | * remote wakeup event. | |
2948 | */ | |
527101ce | 2949 | status = remote_wakeup(udev); |
8808f00c AS |
2950 | #endif |
2951 | ||
2952 | } else { | |
5257d97a | 2953 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
2954 | } |
2955 | usb_unlock_device(udev); | |
2956 | ||
2957 | if (status == 0) { | |
2958 | clear_bit(port1, hub->change_bits); | |
2959 | return; | |
2960 | } | |
2961 | } | |
2962 | ||
24618b0c | 2963 | /* Disconnect any existing devices under this port */ |
8808f00c | 2964 | if (udev) |
24618b0c AS |
2965 | usb_disconnect(&hdev->children[port1-1]); |
2966 | clear_bit(port1, hub->change_bits); | |
2967 | ||
5257d97a AS |
2968 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
2969 | USB_PORT_STAT_C_ENABLE)) { | |
2970 | status = hub_port_debounce(hub, port1); | |
2971 | if (status < 0) { | |
2972 | if (printk_ratelimit()) | |
2973 | dev_err(hub_dev, "connect-debounce failed, " | |
2974 | "port %d disabled\n", port1); | |
2975 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
2976 | } else { | |
2977 | portstatus = status; | |
2978 | } | |
2979 | } | |
2980 | ||
24618b0c | 2981 | /* Return now if debouncing failed or nothing is connected */ |
1da177e4 LT |
2982 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
2983 | ||
2984 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 2985 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
1da177e4 LT |
2986 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
2987 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
5257d97a | 2988 | |
1da177e4 LT |
2989 | if (portstatus & USB_PORT_STAT_ENABLE) |
2990 | goto done; | |
2991 | return; | |
2992 | } | |
2993 | ||
1da177e4 | 2994 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
2995 | |
2996 | /* reallocate for each attempt, since references | |
2997 | * to the previous one can escape in various ways | |
2998 | */ | |
2999 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
3000 | if (!udev) { | |
3001 | dev_err (hub_dev, | |
3002 | "couldn't allocate port %d usb_device\n", | |
3003 | port1); | |
3004 | goto done; | |
3005 | } | |
3006 | ||
3007 | usb_set_device_state(udev, USB_STATE_POWERED); | |
55c52718 | 3008 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 3009 | udev->level = hdev->level + 1; |
8af548dc | 3010 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 3011 | |
e7b77172 SS |
3012 | /* |
3013 | * USB 3.0 devices are reset automatically before the connect | |
3014 | * port status change appears, and the root hub port status | |
3015 | * shows the correct speed. We also get port change | |
3016 | * notifications for USB 3.0 devices from the USB 3.0 portion of | |
3017 | * an external USB 3.0 hub, but this isn't handled correctly yet | |
3018 | * FIXME. | |
3019 | */ | |
3020 | ||
3021 | if (!(hcd->driver->flags & HCD_USB3)) | |
3022 | udev->speed = USB_SPEED_UNKNOWN; | |
3023 | else if ((hdev->parent == NULL) && | |
3024 | (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))) | |
3025 | udev->speed = USB_SPEED_SUPER; | |
3026 | else | |
3027 | udev->speed = USB_SPEED_UNKNOWN; | |
3028 | ||
c6515272 SS |
3029 | /* |
3030 | * xHCI needs to issue an address device command later | |
3031 | * in the hub_port_init sequence for SS/HS/FS/LS devices. | |
3032 | */ | |
3033 | if (!(hcd->driver->flags & HCD_USB3)) { | |
3034 | /* set the address */ | |
3035 | choose_address(udev); | |
3036 | if (udev->devnum <= 0) { | |
3037 | status = -ENOTCONN; /* Don't retry */ | |
3038 | goto loop; | |
3039 | } | |
3040 | } | |
3041 | ||
e7b77172 | 3042 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
3043 | status = hub_port_init(hub, udev, port1, i); |
3044 | if (status < 0) | |
3045 | goto loop; | |
3046 | ||
3047 | /* consecutive bus-powered hubs aren't reliable; they can | |
3048 | * violate the voltage drop budget. if the new child has | |
3049 | * a "powered" LED, users should notice we didn't enable it | |
3050 | * (without reading syslog), even without per-port LEDs | |
3051 | * on the parent. | |
3052 | */ | |
3053 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 3054 | && udev->bus_mA <= 100) { |
1da177e4 LT |
3055 | u16 devstat; |
3056 | ||
3057 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
3058 | &devstat); | |
55c52718 | 3059 | if (status < 2) { |
1da177e4 LT |
3060 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
3061 | goto loop_disable; | |
3062 | } | |
55c52718 | 3063 | le16_to_cpus(&devstat); |
1da177e4 LT |
3064 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
3065 | dev_err(&udev->dev, | |
3066 | "can't connect bus-powered hub " | |
3067 | "to this port\n"); | |
3068 | if (hub->has_indicators) { | |
3069 | hub->indicator[port1-1] = | |
3070 | INDICATOR_AMBER_BLINK; | |
c4028958 | 3071 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
3072 | } |
3073 | status = -ENOTCONN; /* Don't retry */ | |
3074 | goto loop_disable; | |
3075 | } | |
3076 | } | |
3077 | ||
3078 | /* check for devices running slower than they could */ | |
3079 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
3080 | && udev->speed == USB_SPEED_FULL | |
3081 | && highspeed_hubs != 0) | |
3082 | check_highspeed (hub, udev, port1); | |
3083 | ||
3084 | /* Store the parent's children[] pointer. At this point | |
3085 | * udev becomes globally accessible, although presumably | |
3086 | * no one will look at it until hdev is unlocked. | |
3087 | */ | |
1da177e4 LT |
3088 | status = 0; |
3089 | ||
3090 | /* We mustn't add new devices if the parent hub has | |
3091 | * been disconnected; we would race with the | |
3092 | * recursively_mark_NOTATTACHED() routine. | |
3093 | */ | |
3094 | spin_lock_irq(&device_state_lock); | |
3095 | if (hdev->state == USB_STATE_NOTATTACHED) | |
3096 | status = -ENOTCONN; | |
3097 | else | |
3098 | hdev->children[port1-1] = udev; | |
3099 | spin_unlock_irq(&device_state_lock); | |
3100 | ||
3101 | /* Run it through the hoops (find a driver, etc) */ | |
3102 | if (!status) { | |
3103 | status = usb_new_device(udev); | |
3104 | if (status) { | |
3105 | spin_lock_irq(&device_state_lock); | |
3106 | hdev->children[port1-1] = NULL; | |
3107 | spin_unlock_irq(&device_state_lock); | |
3108 | } | |
3109 | } | |
3110 | ||
1da177e4 LT |
3111 | if (status) |
3112 | goto loop_disable; | |
3113 | ||
3114 | status = hub_power_remaining(hub); | |
3115 | if (status) | |
55c52718 | 3116 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
3117 | |
3118 | return; | |
3119 | ||
3120 | loop_disable: | |
3121 | hub_port_disable(hub, port1, 1); | |
3122 | loop: | |
fc721f51 | 3123 | usb_ep0_reinit(udev); |
1da177e4 LT |
3124 | release_address(udev); |
3125 | usb_put_dev(udev); | |
ffcdc18d | 3126 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
3127 | break; |
3128 | } | |
3a31155c AS |
3129 | if (hub->hdev->parent || |
3130 | !hcd->driver->port_handed_over || | |
3131 | !(hcd->driver->port_handed_over)(hcd, port1)) | |
3132 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
3133 | port1); | |
1da177e4 LT |
3134 | |
3135 | done: | |
3136 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
3137 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
3138 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
3139 | } |
3140 | ||
3141 | static void hub_events(void) | |
3142 | { | |
3143 | struct list_head *tmp; | |
3144 | struct usb_device *hdev; | |
3145 | struct usb_interface *intf; | |
3146 | struct usb_hub *hub; | |
3147 | struct device *hub_dev; | |
3148 | u16 hubstatus; | |
3149 | u16 hubchange; | |
3150 | u16 portstatus; | |
3151 | u16 portchange; | |
3152 | int i, ret; | |
3153 | int connect_change; | |
3154 | ||
3155 | /* | |
3156 | * We restart the list every time to avoid a deadlock with | |
3157 | * deleting hubs downstream from this one. This should be | |
3158 | * safe since we delete the hub from the event list. | |
3159 | * Not the most efficient, but avoids deadlocks. | |
3160 | */ | |
3161 | while (1) { | |
3162 | ||
3163 | /* Grab the first entry at the beginning of the list */ | |
3164 | spin_lock_irq(&hub_event_lock); | |
3165 | if (list_empty(&hub_event_list)) { | |
3166 | spin_unlock_irq(&hub_event_lock); | |
3167 | break; | |
3168 | } | |
3169 | ||
3170 | tmp = hub_event_list.next; | |
3171 | list_del_init(tmp); | |
3172 | ||
3173 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
3174 | kref_get(&hub->kref); |
3175 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 3176 | |
e8054854 AS |
3177 | hdev = hub->hdev; |
3178 | hub_dev = hub->intfdev; | |
3179 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 3180 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
3181 | hdev->state, hub->descriptor |
3182 | ? hub->descriptor->bNbrPorts | |
3183 | : 0, | |
3184 | /* NOTE: expects max 15 ports... */ | |
3185 | (u16) hub->change_bits[0], | |
40f122f3 | 3186 | (u16) hub->event_bits[0]); |
1da177e4 | 3187 | |
1da177e4 LT |
3188 | /* Lock the device, then check to see if we were |
3189 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 3190 | usb_lock_device(hdev); |
e8054854 | 3191 | if (unlikely(hub->disconnected)) |
1da177e4 LT |
3192 | goto loop; |
3193 | ||
3194 | /* If the hub has died, clean up after it */ | |
3195 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 3196 | hub->error = -ENODEV; |
4330354f | 3197 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
3198 | goto loop; |
3199 | } | |
3200 | ||
40f122f3 AS |
3201 | /* Autoresume */ |
3202 | ret = usb_autopm_get_interface(intf); | |
3203 | if (ret) { | |
3204 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
3205 | goto loop; | |
3206 | } | |
a8e7c565 | 3207 | |
40f122f3 | 3208 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 3209 | if (hub->quiescing) |
40f122f3 | 3210 | goto loop_autopm; |
1da177e4 LT |
3211 | |
3212 | if (hub->error) { | |
3213 | dev_dbg (hub_dev, "resetting for error %d\n", | |
3214 | hub->error); | |
3215 | ||
742120c6 | 3216 | ret = usb_reset_device(hdev); |
1da177e4 LT |
3217 | if (ret) { |
3218 | dev_dbg (hub_dev, | |
3219 | "error resetting hub: %d\n", ret); | |
40f122f3 | 3220 | goto loop_autopm; |
1da177e4 LT |
3221 | } |
3222 | ||
3223 | hub->nerrors = 0; | |
3224 | hub->error = 0; | |
3225 | } | |
3226 | ||
3227 | /* deal with port status changes */ | |
3228 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
3229 | if (test_bit(i, hub->busy_bits)) | |
3230 | continue; | |
3231 | connect_change = test_bit(i, hub->change_bits); | |
3232 | if (!test_and_clear_bit(i, hub->event_bits) && | |
6ee0b270 | 3233 | !connect_change) |
1da177e4 LT |
3234 | continue; |
3235 | ||
3236 | ret = hub_port_status(hub, i, | |
3237 | &portstatus, &portchange); | |
3238 | if (ret < 0) | |
3239 | continue; | |
3240 | ||
1da177e4 LT |
3241 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
3242 | clear_port_feature(hdev, i, | |
3243 | USB_PORT_FEAT_C_CONNECTION); | |
3244 | connect_change = 1; | |
3245 | } | |
3246 | ||
3247 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
3248 | if (!connect_change) | |
3249 | dev_dbg (hub_dev, | |
3250 | "port %d enable change, " | |
3251 | "status %08x\n", | |
3252 | i, portstatus); | |
3253 | clear_port_feature(hdev, i, | |
3254 | USB_PORT_FEAT_C_ENABLE); | |
3255 | ||
3256 | /* | |
3257 | * EM interference sometimes causes badly | |
3258 | * shielded USB devices to be shutdown by | |
3259 | * the hub, this hack enables them again. | |
3260 | * Works at least with mouse driver. | |
3261 | */ | |
3262 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
3263 | && !connect_change | |
3264 | && hdev->children[i-1]) { | |
3265 | dev_err (hub_dev, | |
3266 | "port %i " | |
3267 | "disabled by hub (EMI?), " | |
3268 | "re-enabling...\n", | |
3269 | i); | |
3270 | connect_change = 1; | |
3271 | } | |
3272 | } | |
3273 | ||
3274 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
8808f00c AS |
3275 | struct usb_device *udev; |
3276 | ||
1da177e4 LT |
3277 | clear_port_feature(hdev, i, |
3278 | USB_PORT_FEAT_C_SUSPEND); | |
8808f00c AS |
3279 | udev = hdev->children[i-1]; |
3280 | if (udev) { | |
3281 | usb_lock_device(udev); | |
1da177e4 LT |
3282 | ret = remote_wakeup(hdev-> |
3283 | children[i-1]); | |
8808f00c | 3284 | usb_unlock_device(udev); |
1da177e4 LT |
3285 | if (ret < 0) |
3286 | connect_change = 1; | |
3287 | } else { | |
3288 | ret = -ENODEV; | |
3289 | hub_port_disable(hub, i, 1); | |
3290 | } | |
3291 | dev_dbg (hub_dev, | |
3292 | "resume on port %d, status %d\n", | |
3293 | i, ret); | |
3294 | } | |
3295 | ||
3296 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
3297 | dev_err (hub_dev, | |
3298 | "over-current change on port %d\n", | |
3299 | i); | |
3300 | clear_port_feature(hdev, i, | |
3301 | USB_PORT_FEAT_C_OVER_CURRENT); | |
8520f380 | 3302 | hub_power_on(hub, true); |
1da177e4 LT |
3303 | } |
3304 | ||
3305 | if (portchange & USB_PORT_STAT_C_RESET) { | |
3306 | dev_dbg (hub_dev, | |
3307 | "reset change on port %d\n", | |
3308 | i); | |
3309 | clear_port_feature(hdev, i, | |
3310 | USB_PORT_FEAT_C_RESET); | |
3311 | } | |
3312 | ||
3313 | if (connect_change) | |
3314 | hub_port_connect_change(hub, i, | |
3315 | portstatus, portchange); | |
3316 | } /* end for i */ | |
3317 | ||
3318 | /* deal with hub status changes */ | |
3319 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
3320 | ; /* do nothing */ | |
3321 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
3322 | dev_err (hub_dev, "get_hub_status failed\n"); | |
3323 | else { | |
3324 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
3325 | dev_dbg (hub_dev, "power change\n"); | |
3326 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
3327 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
3328 | /* FIXME: Is this always true? */ | |
55c52718 | 3329 | hub->limited_power = 1; |
403fae78 | 3330 | else |
3331 | hub->limited_power = 0; | |
1da177e4 LT |
3332 | } |
3333 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
3334 | dev_dbg (hub_dev, "overcurrent change\n"); | |
3335 | msleep(500); /* Cool down */ | |
3336 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
8520f380 | 3337 | hub_power_on(hub, true); |
1da177e4 LT |
3338 | } |
3339 | } | |
3340 | ||
40f122f3 AS |
3341 | loop_autopm: |
3342 | /* Allow autosuspend if we're not going to run again */ | |
3343 | if (list_empty(&hub->event_list)) | |
3344 | usb_autopm_enable(intf); | |
1da177e4 LT |
3345 | loop: |
3346 | usb_unlock_device(hdev); | |
e8054854 | 3347 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
3348 | |
3349 | } /* end while (1) */ | |
3350 | } | |
3351 | ||
3352 | static int hub_thread(void *__unused) | |
3353 | { | |
3bb1af52 AS |
3354 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
3355 | * port handover. Otherwise it might see that a full-speed device | |
3356 | * was gone before the EHCI controller had handed its port over to | |
3357 | * the companion full-speed controller. | |
3358 | */ | |
83144186 | 3359 | set_freezable(); |
3bb1af52 | 3360 | |
1da177e4 LT |
3361 | do { |
3362 | hub_events(); | |
e42837bc | 3363 | wait_event_freezable(khubd_wait, |
9c8d6178 | 3364 | !list_empty(&hub_event_list) || |
3365 | kthread_should_stop()); | |
9c8d6178 | 3366 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 3367 | |
9c8d6178 | 3368 | pr_debug("%s: khubd exiting\n", usbcore_name); |
3369 | return 0; | |
1da177e4 LT |
3370 | } |
3371 | ||
3372 | static struct usb_device_id hub_id_table [] = { | |
3373 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, | |
3374 | .bDeviceClass = USB_CLASS_HUB}, | |
3375 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
3376 | .bInterfaceClass = USB_CLASS_HUB}, | |
3377 | { } /* Terminating entry */ | |
3378 | }; | |
3379 | ||
3380 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
3381 | ||
3382 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
3383 | .name = "hub", |
3384 | .probe = hub_probe, | |
3385 | .disconnect = hub_disconnect, | |
3386 | .suspend = hub_suspend, | |
3387 | .resume = hub_resume, | |
f07600cf | 3388 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
3389 | .pre_reset = hub_pre_reset, |
3390 | .post_reset = hub_post_reset, | |
1da177e4 LT |
3391 | .ioctl = hub_ioctl, |
3392 | .id_table = hub_id_table, | |
40f122f3 | 3393 | .supports_autosuspend = 1, |
1da177e4 LT |
3394 | }; |
3395 | ||
3396 | int usb_hub_init(void) | |
3397 | { | |
1da177e4 LT |
3398 | if (usb_register(&hub_driver) < 0) { |
3399 | printk(KERN_ERR "%s: can't register hub driver\n", | |
3400 | usbcore_name); | |
3401 | return -1; | |
3402 | } | |
3403 | ||
9c8d6178 | 3404 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
3405 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 3406 | return 0; |
1da177e4 LT |
3407 | |
3408 | /* Fall through if kernel_thread failed */ | |
3409 | usb_deregister(&hub_driver); | |
3410 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
3411 | ||
3412 | return -1; | |
3413 | } | |
3414 | ||
3415 | void usb_hub_cleanup(void) | |
3416 | { | |
9c8d6178 | 3417 | kthread_stop(khubd_task); |
1da177e4 LT |
3418 | |
3419 | /* | |
3420 | * Hub resources are freed for us by usb_deregister. It calls | |
3421 | * usb_driver_purge on every device which in turn calls that | |
3422 | * devices disconnect function if it is using this driver. | |
3423 | * The hub_disconnect function takes care of releasing the | |
3424 | * individual hub resources. -greg | |
3425 | */ | |
3426 | usb_deregister(&hub_driver); | |
3427 | } /* usb_hub_cleanup() */ | |
3428 | ||
eb764c4b AS |
3429 | static int descriptors_changed(struct usb_device *udev, |
3430 | struct usb_device_descriptor *old_device_descriptor) | |
3431 | { | |
3432 | int changed = 0; | |
3433 | unsigned index; | |
3434 | unsigned serial_len = 0; | |
3435 | unsigned len; | |
3436 | unsigned old_length; | |
3437 | int length; | |
3438 | char *buf; | |
3439 | ||
3440 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
3441 | sizeof(*old_device_descriptor)) != 0) | |
3442 | return 1; | |
3443 | ||
3444 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
3445 | * device descriptor haven't changed, we will assume the | |
3446 | * Manufacturer and Product strings haven't changed either. | |
3447 | * But the SerialNumber string could be different (e.g., a | |
3448 | * different flash card of the same brand). | |
3449 | */ | |
3450 | if (udev->serial) | |
3451 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 3452 | |
eb764c4b | 3453 | len = serial_len; |
1da177e4 | 3454 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
3455 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
3456 | len = max(len, old_length); | |
1da177e4 | 3457 | } |
eb764c4b | 3458 | |
0cc1a51f | 3459 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
3460 | if (buf == NULL) { |
3461 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
3462 | /* assume the worst */ | |
3463 | return 1; | |
3464 | } | |
3465 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 3466 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
3467 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
3468 | old_length); | |
eb764c4b | 3469 | if (length != old_length) { |
1da177e4 LT |
3470 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
3471 | index, length); | |
eb764c4b | 3472 | changed = 1; |
1da177e4 LT |
3473 | break; |
3474 | } | |
3475 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
3476 | != 0) { | |
3477 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
3478 | index, |
3479 | ((struct usb_config_descriptor *) buf)-> | |
3480 | bConfigurationValue); | |
3481 | changed = 1; | |
1da177e4 LT |
3482 | break; |
3483 | } | |
3484 | } | |
eb764c4b AS |
3485 | |
3486 | if (!changed && serial_len) { | |
3487 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
3488 | buf, serial_len); | |
3489 | if (length + 1 != serial_len) { | |
3490 | dev_dbg(&udev->dev, "serial string error %d\n", | |
3491 | length); | |
3492 | changed = 1; | |
3493 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
3494 | dev_dbg(&udev->dev, "serial string changed\n"); | |
3495 | changed = 1; | |
3496 | } | |
3497 | } | |
3498 | ||
1da177e4 | 3499 | kfree(buf); |
eb764c4b | 3500 | return changed; |
1da177e4 LT |
3501 | } |
3502 | ||
3503 | /** | |
742120c6 | 3504 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
3505 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
3506 | * | |
79efa097 AS |
3507 | * WARNING - don't use this routine to reset a composite device |
3508 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 3509 | * Use usb_reset_device() instead. |
1da177e4 LT |
3510 | * |
3511 | * Do a port reset, reassign the device's address, and establish its | |
3512 | * former operating configuration. If the reset fails, or the device's | |
3513 | * descriptors change from their values before the reset, or the original | |
3514 | * configuration and altsettings cannot be restored, a flag will be set | |
3515 | * telling khubd to pretend the device has been disconnected and then | |
3516 | * re-connected. All drivers will be unbound, and the device will be | |
3517 | * re-enumerated and probed all over again. | |
3518 | * | |
3519 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
3520 | * flagged for logical disconnection, or some other negative error code | |
3521 | * if the reset wasn't even attempted. | |
3522 | * | |
3523 | * The caller must own the device lock. For example, it's safe to use | |
3524 | * this from a driver probe() routine after downloading new firmware. | |
3525 | * For calls that might not occur during probe(), drivers should lock | |
3526 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
3527 | * |
3528 | * Locking exception: This routine may also be called from within an | |
3529 | * autoresume handler. Such usage won't conflict with other tasks | |
3530 | * holding the device lock because these tasks should always call | |
3531 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 3532 | */ |
742120c6 | 3533 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
3534 | { |
3535 | struct usb_device *parent_hdev = udev->parent; | |
3536 | struct usb_hub *parent_hub; | |
3537 | struct usb_device_descriptor descriptor = udev->descriptor; | |
12c3da34 AS |
3538 | int i, ret = 0; |
3539 | int port1 = udev->portnum; | |
1da177e4 LT |
3540 | |
3541 | if (udev->state == USB_STATE_NOTATTACHED || | |
3542 | udev->state == USB_STATE_SUSPENDED) { | |
3543 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3544 | udev->state); | |
3545 | return -EINVAL; | |
3546 | } | |
3547 | ||
3548 | if (!parent_hdev) { | |
3549 | /* this requires hcd-specific logic; see OHCI hc_restart() */ | |
441b62c1 | 3550 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
3551 | return -EISDIR; |
3552 | } | |
1da177e4 LT |
3553 | parent_hub = hdev_to_hub(parent_hdev); |
3554 | ||
1da177e4 LT |
3555 | set_bit(port1, parent_hub->busy_bits); |
3556 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3557 | ||
3558 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3559 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 3560 | usb_ep0_reinit(udev); |
1da177e4 | 3561 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 3562 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3563 | break; |
3564 | } | |
3565 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 3566 | |
1da177e4 LT |
3567 | if (ret < 0) |
3568 | goto re_enumerate; | |
3569 | ||
3570 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 3571 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
3572 | dev_info(&udev->dev, "device firmware changed\n"); |
3573 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3574 | goto re_enumerate; | |
3575 | } | |
4fe0387a AS |
3576 | |
3577 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
3578 | if (!udev->actconfig) |
3579 | goto done; | |
1da177e4 LT |
3580 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
3581 | USB_REQ_SET_CONFIGURATION, 0, | |
3582 | udev->actconfig->desc.bConfigurationValue, 0, | |
3583 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3584 | if (ret < 0) { | |
3585 | dev_err(&udev->dev, | |
3586 | "can't restore configuration #%d (error=%d)\n", | |
3587 | udev->actconfig->desc.bConfigurationValue, ret); | |
3588 | goto re_enumerate; | |
3589 | } | |
3590 | usb_set_device_state(udev, USB_STATE_CONFIGURED); | |
3591 | ||
4fe0387a AS |
3592 | /* Put interfaces back into the same altsettings as before. |
3593 | * Don't bother to send the Set-Interface request for interfaces | |
3594 | * that were already in altsetting 0; besides being unnecessary, | |
3595 | * many devices can't handle it. Instead just reset the host-side | |
3596 | * endpoint state. | |
3597 | */ | |
1da177e4 LT |
3598 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3599 | struct usb_interface *intf = udev->actconfig->interface[i]; | |
3600 | struct usb_interface_descriptor *desc; | |
3601 | ||
1da177e4 | 3602 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
3603 | if (desc->bAlternateSetting == 0) { |
3604 | usb_disable_interface(udev, intf, true); | |
3605 | usb_enable_interface(udev, intf, true); | |
3606 | ret = 0; | |
3607 | } else { | |
3608 | ret = usb_set_interface(udev, desc->bInterfaceNumber, | |
3609 | desc->bAlternateSetting); | |
3610 | } | |
1da177e4 LT |
3611 | if (ret < 0) { |
3612 | dev_err(&udev->dev, "failed to restore interface %d " | |
3613 | "altsetting %d (error=%d)\n", | |
3614 | desc->bInterfaceNumber, | |
3615 | desc->bAlternateSetting, | |
3616 | ret); | |
3617 | goto re_enumerate; | |
3618 | } | |
3619 | } | |
3620 | ||
3621 | done: | |
1da177e4 LT |
3622 | return 0; |
3623 | ||
3624 | re_enumerate: | |
3625 | hub_port_logical_disconnect(parent_hub, port1); | |
3626 | return -ENODEV; | |
3627 | } | |
79efa097 AS |
3628 | |
3629 | /** | |
742120c6 | 3630 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 3631 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
3632 | * |
3633 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3634 | * method), performs the port reset, and then lets the drivers know that | |
3635 | * the reset is over (using their post_reset method). | |
3636 | * | |
742120c6 | 3637 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
3638 | * |
3639 | * The caller must own the device lock. For example, it's safe to use | |
3640 | * this from a driver probe() routine after downloading new firmware. | |
3641 | * For calls that might not occur during probe(), drivers should lock | |
3642 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
3643 | * |
3644 | * If an interface is currently being probed or disconnected, we assume | |
3645 | * its driver knows how to handle resets. For all other interfaces, | |
3646 | * if the driver doesn't have pre_reset and post_reset methods then | |
3647 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 3648 | */ |
742120c6 | 3649 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
3650 | { |
3651 | int ret; | |
852c4b43 | 3652 | int i; |
79efa097 AS |
3653 | struct usb_host_config *config = udev->actconfig; |
3654 | ||
3655 | if (udev->state == USB_STATE_NOTATTACHED || | |
3656 | udev->state == USB_STATE_SUSPENDED) { | |
3657 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3658 | udev->state); | |
3659 | return -EINVAL; | |
3660 | } | |
3661 | ||
645daaab | 3662 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3663 | usb_autoresume_device(udev); |
645daaab | 3664 | |
79efa097 | 3665 | if (config) { |
79efa097 | 3666 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
3667 | struct usb_interface *cintf = config->interface[i]; |
3668 | struct usb_driver *drv; | |
78d9a487 | 3669 | int unbind = 0; |
852c4b43 AS |
3670 | |
3671 | if (cintf->dev.driver) { | |
79efa097 | 3672 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
3673 | if (drv->pre_reset && drv->post_reset) |
3674 | unbind = (drv->pre_reset)(cintf); | |
3675 | else if (cintf->condition == | |
3676 | USB_INTERFACE_BOUND) | |
3677 | unbind = 1; | |
3678 | if (unbind) | |
3679 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
3680 | } |
3681 | } | |
3682 | } | |
3683 | ||
742120c6 | 3684 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
3685 | |
3686 | if (config) { | |
79efa097 | 3687 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
3688 | struct usb_interface *cintf = config->interface[i]; |
3689 | struct usb_driver *drv; | |
78d9a487 | 3690 | int rebind = cintf->needs_binding; |
852c4b43 | 3691 | |
78d9a487 | 3692 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
3693 | drv = to_usb_driver(cintf->dev.driver); |
3694 | if (drv->post_reset) | |
78d9a487 AS |
3695 | rebind = (drv->post_reset)(cintf); |
3696 | else if (cintf->condition == | |
3697 | USB_INTERFACE_BOUND) | |
3698 | rebind = 1; | |
79efa097 | 3699 | } |
6c640945 | 3700 | if (ret == 0 && rebind) |
78d9a487 | 3701 | usb_rebind_intf(cintf); |
79efa097 AS |
3702 | } |
3703 | } | |
3704 | ||
94fcda1f | 3705 | usb_autosuspend_device(udev); |
79efa097 AS |
3706 | return ret; |
3707 | } | |
742120c6 | 3708 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
3709 | |
3710 | ||
3711 | /** | |
3712 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
3713 | * @iface: USB interface belonging to the device to reset | |
3714 | * | |
3715 | * This function can be used to reset a USB device from an atomic | |
3716 | * context, where usb_reset_device() won't work (as it blocks). | |
3717 | * | |
3718 | * Doing a reset via this method is functionally equivalent to calling | |
3719 | * usb_reset_device(), except for the fact that it is delayed to a | |
3720 | * workqueue. This means that any drivers bound to other interfaces | |
3721 | * might be unbound, as well as users from usbfs in user space. | |
3722 | * | |
3723 | * Corner cases: | |
3724 | * | |
3725 | * - Scheduling two resets at the same time from two different drivers | |
3726 | * attached to two different interfaces of the same device is | |
3727 | * possible; depending on how the driver attached to each interface | |
3728 | * handles ->pre_reset(), the second reset might happen or not. | |
3729 | * | |
3730 | * - If a driver is unbound and it had a pending reset, the reset will | |
3731 | * be cancelled. | |
3732 | * | |
3733 | * - This function can be called during .probe() or .disconnect() | |
3734 | * times. On return from .disconnect(), any pending resets will be | |
3735 | * cancelled. | |
3736 | * | |
3737 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
3738 | * does its own. | |
3739 | * | |
3740 | * NOTE: We don't do any reference count tracking because it is not | |
3741 | * needed. The lifecycle of the work_struct is tied to the | |
3742 | * usb_interface. Before destroying the interface we cancel the | |
3743 | * work_struct, so the fact that work_struct is queued and or | |
3744 | * running means the interface (and thus, the device) exist and | |
3745 | * are referenced. | |
3746 | */ | |
3747 | void usb_queue_reset_device(struct usb_interface *iface) | |
3748 | { | |
3749 | schedule_work(&iface->reset_ws); | |
3750 | } | |
3751 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |