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usb: xhci: fix build warning
[deliverable/linux.git] / drivers / usb / core / hcd.c
CommitLineData
1da177e4
LT		 1/*
2 * (C) Copyright Linus Torvalds 1999
3 * (C) Copyright Johannes Erdfelt 1999-2001
4 * (C) Copyright Andreas Gal 1999
5 * (C) Copyright Gregory P. Smith 1999
6 * (C) Copyright Deti Fliegl 1999
7 * (C) Copyright Randy Dunlap 2000
8 * (C) Copyright David Brownell 2000-2002
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
b53d657d 25#include <linux/bcd.h>
1da177e4
LT		 26#include <linux/module.h>
27#include <linux/version.h>
28#include <linux/kernel.h>
29#include <linux/slab.h>
30#include <linux/completion.h>
31#include <linux/utsname.h>
32#include <linux/mm.h>
33#include <asm/io.h>
1da177e4
LT		 34#include <linux/device.h>
35#include <linux/dma-mapping.h>
4186ecf8 36#include <linux/mutex.h>
1da177e4
LT		 37#include <asm/irq.h>
38#include <asm/byteorder.h>
b3476675 39#include <asm/unaligned.h>
64a21d02 40#include <linux/platform_device.h>
6b157c9b 41#include <linux/workqueue.h>
da0aa716 42#include <linux/pm_runtime.h>
1da177e4
LT		 43
44#include <linux/usb.h>
27729aad 45#include <linux/usb/hcd.h>
1da177e4
LT		 46
47#include "usb.h"
1da177e4
LT		 48
49
1da177e4
LT		 50/*-------------------------------------------------------------------------*/
51
52/*
53 * USB Host Controller Driver framework
54 *
55 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
56 * HCD-specific behaviors/bugs.
57 *
58 * This does error checks, tracks devices and urbs, and delegates to a
59 * "hc_driver" only for code (and data) that really needs to know about
60 * hardware differences. That includes root hub registers, i/o queues,
61 * and so on ... but as little else as possible.
62 *
63 * Shared code includes most of the "root hub" code (these are emulated,
64 * though each HC's hardware works differently) and PCI glue, plus request
65 * tracking overhead. The HCD code should only block on spinlocks or on
66 * hardware handshaking; blocking on software events (such as other kernel
67 * threads releasing resources, or completing actions) is all generic.
68 *
69 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
70 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
71 * only by the hub driver ... and that neither should be seen or used by
72 * usb client device drivers.
73 *
74 * Contributors of ideas or unattributed patches include: David Brownell,
75 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
76 *
77 * HISTORY:
78 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
79 * associated cleanup. "usb_hcd" still != "usb_bus".
80 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
81 */
82
83/*-------------------------------------------------------------------------*/
84
9beeee65
AS		 85/* Keep track of which host controller drivers are loaded */
86unsigned long usb_hcds_loaded;
87EXPORT_SYMBOL_GPL(usb_hcds_loaded);
88
1da177e4
LT		 89/* host controllers we manage */
90LIST_HEAD (usb_bus_list);
91EXPORT_SYMBOL_GPL (usb_bus_list);
92
93/* used when allocating bus numbers */
94#define USB_MAXBUS 64
95struct usb_busmap {
96 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
97};
98static struct usb_busmap busmap;
99
100/* used when updating list of hcds */
4186ecf8 101DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
1da177e4
LT		 102EXPORT_SYMBOL_GPL (usb_bus_list_lock);
103
104/* used for controlling access to virtual root hubs */
105static DEFINE_SPINLOCK(hcd_root_hub_lock);
106
809a58b8
AS		 107/* used when updating an endpoint's URB list */
108static DEFINE_SPINLOCK(hcd_urb_list_lock);
1da177e4 109
cde217a5
AS		 110/* used to protect against unlinking URBs after the device is gone */
111static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
112
1da177e4
LT		 113/* wait queue for synchronous unlinks */
114DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
115
809a58b8
AS		 116static inline int is_root_hub(struct usb_device *udev)
117{
118 return (udev->parent == NULL);
119}
120
1da177e4
LT		 121/*-------------------------------------------------------------------------*/
122
123/*
124 * Sharable chunks of root hub code.
125 */
126
127/*-------------------------------------------------------------------------*/
b53d657d
SAS		 128#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
129#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))
1da177e4 130
d2e9b4d6
SS		 131/* usb 3.0 root hub device descriptor */
132static const u8 usb3_rh_dev_descriptor[18] = {
133 0x12, /* __u8 bLength; */
134 0x01, /* __u8 bDescriptorType; Device */
135 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
136
137 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
138 0x00, /* __u8 bDeviceSubClass; */
139 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
140 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
141
bfb8bfad 142 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
cd780694 143 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
d2e9b4d6
SS		 144 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
145
146 0x03, /* __u8 iManufacturer; */
147 0x02, /* __u8 iProduct; */
148 0x01, /* __u8 iSerialNumber; */
149 0x01 /* __u8 bNumConfigurations; */
150};
151
1da177e4
LT		 152/* usb 2.0 root hub device descriptor */
153static const u8 usb2_rh_dev_descriptor [18] = {
154 0x12, /* __u8 bLength; */
155 0x01, /* __u8 bDescriptorType; Device */
156 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
157
158 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
159 0x00, /* __u8 bDeviceSubClass; */
7329e211 160 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
16f16d11 161 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4 162
bfb8bfad 163 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
667d691e 164 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
1da177e4
LT		 165 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
166
167 0x03, /* __u8 iManufacturer; */
168 0x02, /* __u8 iProduct; */
169 0x01, /* __u8 iSerialNumber; */
170 0x01 /* __u8 bNumConfigurations; */
171};
172
173/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
174
175/* usb 1.1 root hub device descriptor */
176static const u8 usb11_rh_dev_descriptor [18] = {
177 0x12, /* __u8 bLength; */
178 0x01, /* __u8 bDescriptorType; Device */
179 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
180
181 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
182 0x00, /* __u8 bDeviceSubClass; */
183 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
16f16d11 184 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
1da177e4 185
bfb8bfad 186 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
667d691e 187 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
1da177e4
LT		 188 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
189
190 0x03, /* __u8 iManufacturer; */
191 0x02, /* __u8 iProduct; */
192 0x01, /* __u8 iSerialNumber; */
193 0x01 /* __u8 bNumConfigurations; */
194};
195
196
197/*-------------------------------------------------------------------------*/
198
199/* Configuration descriptors for our root hubs */
200
201static const u8 fs_rh_config_descriptor [] = {
202
203 /* one configuration */
204 0x09, /* __u8 bLength; */
205 0x02, /* __u8 bDescriptorType; Configuration */
206 0x19, 0x00, /* __le16 wTotalLength; */
207 0x01, /* __u8 bNumInterfaces; (1) */
208 0x01, /* __u8 bConfigurationValue; */
209 0x00, /* __u8 iConfiguration; */
210 0xc0, /* __u8 bmAttributes;
211 Bit 7: must be set,
212 6: Self-powered,
213 5: Remote wakeup,
214 4..0: resvd */
215 0x00, /* __u8 MaxPower; */
216
217 /* USB 1.1:
218 * USB 2.0, single TT organization (mandatory):
219 * one interface, protocol 0
220 *
221 * USB 2.0, multiple TT organization (optional):
222 * two interfaces, protocols 1 (like single TT)
223 * and 2 (multiple TT mode) ... config is
224 * sometimes settable
225 * NOT IMPLEMENTED
226 */
227
228 /* one interface */
229 0x09, /* __u8 if_bLength; */
230 0x04, /* __u8 if_bDescriptorType; Interface */
231 0x00, /* __u8 if_bInterfaceNumber; */
232 0x00, /* __u8 if_bAlternateSetting; */
233 0x01, /* __u8 if_bNumEndpoints; */
234 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
235 0x00, /* __u8 if_bInterfaceSubClass; */
236 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
237 0x00, /* __u8 if_iInterface; */
238
239 /* one endpoint (status change endpoint) */
240 0x07, /* __u8 ep_bLength; */
241 0x05, /* __u8 ep_bDescriptorType; Endpoint */
242 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
243 0x03, /* __u8 ep_bmAttributes; Interrupt */
244 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
245 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
246};
247
248static const u8 hs_rh_config_descriptor [] = {
249
250 /* one configuration */
251 0x09, /* __u8 bLength; */
252 0x02, /* __u8 bDescriptorType; Configuration */
253 0x19, 0x00, /* __le16 wTotalLength; */
254 0x01, /* __u8 bNumInterfaces; (1) */
255 0x01, /* __u8 bConfigurationValue; */
256 0x00, /* __u8 iConfiguration; */
257 0xc0, /* __u8 bmAttributes;
258 Bit 7: must be set,
259 6: Self-powered,
260 5: Remote wakeup,
261 4..0: resvd */
262 0x00, /* __u8 MaxPower; */
263
264 /* USB 1.1:
265 * USB 2.0, single TT organization (mandatory):
266 * one interface, protocol 0
267 *
268 * USB 2.0, multiple TT organization (optional):
269 * two interfaces, protocols 1 (like single TT)
270 * and 2 (multiple TT mode) ... config is
271 * sometimes settable
272 * NOT IMPLEMENTED
273 */
274
275 /* one interface */
276 0x09, /* __u8 if_bLength; */
277 0x04, /* __u8 if_bDescriptorType; Interface */
278 0x00, /* __u8 if_bInterfaceNumber; */
279 0x00, /* __u8 if_bAlternateSetting; */
280 0x01, /* __u8 if_bNumEndpoints; */
281 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
282 0x00, /* __u8 if_bInterfaceSubClass; */
283 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
284 0x00, /* __u8 if_iInterface; */
285
286 /* one endpoint (status change endpoint) */
287 0x07, /* __u8 ep_bLength; */
288 0x05, /* __u8 ep_bDescriptorType; Endpoint */
289 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
290 0x03, /* __u8 ep_bmAttributes; Interrupt */
88fafff9 291 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
292 * see hub.c:hub_configure() for details. */
293 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
1da177e4
LT		 294 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
295};
296
d2e9b4d6
SS		 297static const u8 ss_rh_config_descriptor[] = {
298 /* one configuration */
299 0x09, /* __u8 bLength; */
300 0x02, /* __u8 bDescriptorType; Configuration */
22c6a35d 301 0x1f, 0x00, /* __le16 wTotalLength; */
d2e9b4d6
SS		 302 0x01, /* __u8 bNumInterfaces; (1) */
303 0x01, /* __u8 bConfigurationValue; */
304 0x00, /* __u8 iConfiguration; */
305 0xc0, /* __u8 bmAttributes;
306 Bit 7: must be set,
307 6: Self-powered,
308 5: Remote wakeup,
309 4..0: resvd */
310 0x00, /* __u8 MaxPower; */
311
312 /* one interface */
313 0x09, /* __u8 if_bLength; */
314 0x04, /* __u8 if_bDescriptorType; Interface */
315 0x00, /* __u8 if_bInterfaceNumber; */
316 0x00, /* __u8 if_bAlternateSetting; */
317 0x01, /* __u8 if_bNumEndpoints; */
318 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
319 0x00, /* __u8 if_bInterfaceSubClass; */
320 0x00, /* __u8 if_bInterfaceProtocol; */
321 0x00, /* __u8 if_iInterface; */
322
323 /* one endpoint (status change endpoint) */
324 0x07, /* __u8 ep_bLength; */
325 0x05, /* __u8 ep_bDescriptorType; Endpoint */
326 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
327 0x03, /* __u8 ep_bmAttributes; Interrupt */
328 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
329 * see hub.c:hub_configure() for details. */
330 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
22c6a35d
SS		 331 0x0c, /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
332
333 /* one SuperSpeed endpoint companion descriptor */
334 0x06, /* __u8 ss_bLength */
335 0x30, /* __u8 ss_bDescriptorType; SuperSpeed EP Companion */
336 0x00, /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
337 0x00, /* __u8 ss_bmAttributes; 1 packet per service interval */
338 0x02, 0x00 /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
d2e9b4d6
SS		 339};
340
c4fc2342
CDH		 341/* authorized_default behaviour:
342 * -1 is authorized for all devices except wireless (old behaviour)
343 * 0 is unauthorized for all devices
344 * 1 is authorized for all devices
345 */
346static int authorized_default = -1;
347module_param(authorized_default, int, S_IRUGO|S_IWUSR);
348MODULE_PARM_DESC(authorized_default,
349 "Default USB device authorization: 0 is not authorized, 1 is "
350 "authorized, -1 is authorized except for wireless USB (default, "
351 "old behaviour");
1da177e4
LT		 352/*-------------------------------------------------------------------------*/
353
392ca68b
GS		 354/**
355 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
356 * @s: Null-terminated ASCII (actually ISO-8859-1) string
357 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
358 * @len: Length (in bytes; may be odd) of descriptor buffer.
359 *
360 * The return value is the number of bytes filled in: 2 + 2*strlen(s) or
361 * buflen, whichever is less.
362 *
363 * USB String descriptors can contain at most 126 characters; input
364 * strings longer than that are truncated.
1da177e4 365 */
392ca68b
GS		 366static unsigned
367ascii2desc(char const *s, u8 *buf, unsigned len)
1da177e4 368{
392ca68b
GS		 369 unsigned n, t = 2 + 2*strlen(s);
370
371 if (t > 254)
372 t = 254; /* Longest possible UTF string descriptor */
373 if (len > t)
374 len = t;
375
376 t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
377
378 n = len;
379 while (n--) {
380 *buf++ = t;
381 if (!n--)
382 break;
383 *buf++ = t >> 8;
384 t = (unsigned char)*s++;
1da177e4 385 }
392ca68b 386 return len;
1da177e4
LT		 387}
388
392ca68b
GS		 389/**
390 * rh_string() - provides string descriptors for root hub
391 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
1da177e4 392 * @hcd: the host controller for this root hub
392ca68b
GS		 393 * @data: buffer for output packet
394 * @len: length of the provided buffer
1da177e4
LT		 395 *
396 * Produces either a manufacturer, product or serial number string for the
397 * virtual root hub device.
392ca68b
GS		 398 * Returns the number of bytes filled in: the length of the descriptor or
399 * of the provided buffer, whichever is less.
1da177e4 400 */
392ca68b
GS		 401static unsigned
402rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
71d2718f 403{
392ca68b
GS		 404 char buf[100];
405 char const *s;
406 static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
1da177e4
LT		 407
408 // language ids
392ca68b
GS		 409 switch (id) {
410 case 0:
411 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
412 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
413 if (len > 4)
414 len = 4;
415 memcpy(data, langids, len);
1da177e4 416 return len;
392ca68b
GS		 417 case 1:
418 /* Serial number */
419 s = hcd->self.bus_name;
420 break;
421 case 2:
422 /* Product name */
423 s = hcd->product_desc;
424 break;
425 case 3:
426 /* Manufacturer */
96b644bd
SH		 427 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
428 init_utsname()->release, hcd->driver->description);
392ca68b
GS		 429 s = buf;
430 break;
1da177e4 431 default:
392ca68b
GS		 432 /* Can't happen; caller guarantees it */
433 return 0;
1da177e4 434 }
392ca68b
GS		 435
436 return ascii2desc(s, data, len);
1da177e4
LT		 437}
438
439
440/* Root hub control transfers execute synchronously */
441static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
442{
443 struct usb_ctrlrequest *cmd;
444 u16 typeReq, wValue, wIndex, wLength;
445 u8 *ubuf = urb->transfer_buffer;
48e82361
SS		 446 /*
447 * tbuf should be as big as the BOS descriptor and
448 * the USB hub descriptor.
449 */
450 u8 tbuf[USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE]
54bee6e1 451 __attribute__((aligned(4)));
1da177e4 452 const u8 *bufp = tbuf;
71d2718f 453 unsigned len = 0;
e9df41c5 454 int status;
7329e211
AS		 455 u8 patch_wakeup = 0;
456 u8 patch_protocol = 0;
1da177e4 457
9439eb94
AS		 458 might_sleep();
459
e9df41c5
AS		 460 spin_lock_irq(&hcd_root_hub_lock);
461 status = usb_hcd_link_urb_to_ep(hcd, urb);
462 spin_unlock_irq(&hcd_root_hub_lock);
463 if (status)
464 return status;
b0d9efba 465 urb->hcpriv = hcd; /* Indicate it's queued */
e9df41c5 466
1da177e4
LT		 467 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
468 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
469 wValue = le16_to_cpu (cmd->wValue);
470 wIndex = le16_to_cpu (cmd->wIndex);
471 wLength = le16_to_cpu (cmd->wLength);
472
473 if (wLength > urb->transfer_buffer_length)
474 goto error;
475
476 urb->actual_length = 0;
477 switch (typeReq) {
478
479 /* DEVICE REQUESTS */
480
fb669cc0
DB		 481 /* The root hub's remote wakeup enable bit is implemented using
482 * driver model wakeup flags. If this system supports wakeup
483 * through USB, userspace may change the default "allow wakeup"
484 * policy through sysfs or these calls.
485 *
486 * Most root hubs support wakeup from downstream devices, for
487 * runtime power management (disabling USB clocks and reducing
488 * VBUS power usage). However, not all of them do so; silicon,
489 * board, and BIOS bugs here are not uncommon, so these can't
490 * be treated quite like external hubs.
491 *
492 * Likewise, not all root hubs will pass wakeup events upstream,
493 * to wake up the whole system. So don't assume root hub and
494 * controller capabilities are identical.
495 */
496
1da177e4 497 case DeviceRequest | USB_REQ_GET_STATUS:
fb669cc0
DB		 498 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
499 << USB_DEVICE_REMOTE_WAKEUP)
1da177e4
LT		 500 | (1 << USB_DEVICE_SELF_POWERED);
501 tbuf [1] = 0;
502 len = 2;
503 break;
504 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
505 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
fb669cc0 506 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
1da177e4
LT		 507 else
508 goto error;
509 break;
510 case DeviceOutRequest | USB_REQ_SET_FEATURE:
fb669cc0
DB		 511 if (device_can_wakeup(&hcd->self.root_hub->dev)
512 && wValue == USB_DEVICE_REMOTE_WAKEUP)
513 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
1da177e4
LT		 514 else
515 goto error;
516 break;
517 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
518 tbuf [0] = 1;
519 len = 1;
520 /* FALLTHROUGH */
521 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
522 break;
523 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
524 switch (wValue & 0xff00) {
525 case USB_DT_DEVICE << 8:
83de4b2b 526 switch (hcd->speed) {
7dd19e69 527 case HCD_USB3:
d2e9b4d6 528 bufp = usb3_rh_dev_descriptor;
7dd19e69
VM		 529 break;
530 case HCD_USB2:
1da177e4 531 bufp = usb2_rh_dev_descriptor;
7dd19e69
VM		 532 break;
533 case HCD_USB11:
1da177e4 534 bufp = usb11_rh_dev_descriptor;
7dd19e69
VM		 535 break;
536 default:
1da177e4 537 goto error;
7dd19e69 538 }
1da177e4 539 len = 18;
7329e211
AS		 540 if (hcd->has_tt)
541 patch_protocol = 1;
1da177e4
LT		 542 break;
543 case USB_DT_CONFIG << 8:
83de4b2b 544 switch (hcd->speed) {
7dd19e69 545 case HCD_USB3:
d2e9b4d6
SS		 546 bufp = ss_rh_config_descriptor;
547 len = sizeof ss_rh_config_descriptor;
7dd19e69
VM		 548 break;
549 case HCD_USB2:
1da177e4
LT		 550 bufp = hs_rh_config_descriptor;
551 len = sizeof hs_rh_config_descriptor;
7dd19e69
VM		 552 break;
553 case HCD_USB11:
1da177e4
LT		 554 bufp = fs_rh_config_descriptor;
555 len = sizeof fs_rh_config_descriptor;
7dd19e69
VM		 556 break;
557 default:
558 goto error;
1da177e4 559 }
fb669cc0 560 if (device_can_wakeup(&hcd->self.root_hub->dev))
1da177e4
LT		 561 patch_wakeup = 1;
562 break;
563 case USB_DT_STRING << 8:
71d2718f
RK		 564 if ((wValue & 0xff) < 4)
565 urb->actual_length = rh_string(wValue & 0xff,
566 hcd, ubuf, wLength);
567 else /* unsupported IDs --> "protocol stall" */
1da177e4 568 goto error;
1da177e4 569 break;
48e82361
SS		 570 case USB_DT_BOS << 8:
571 goto nongeneric;
1da177e4
LT		 572 default:
573 goto error;
574 }
575 break;
576 case DeviceRequest | USB_REQ_GET_INTERFACE:
577 tbuf [0] = 0;
578 len = 1;
579 /* FALLTHROUGH */
580 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
581 break;
582 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
583 // wValue == urb->dev->devaddr
584 dev_dbg (hcd->self.controller, "root hub device address %d\n",
585 wValue);
586 break;
587
588 /* INTERFACE REQUESTS (no defined feature/status flags) */
589
590 /* ENDPOINT REQUESTS */
591
592 case EndpointRequest | USB_REQ_GET_STATUS:
593 // ENDPOINT_HALT flag
594 tbuf [0] = 0;
595 tbuf [1] = 0;
596 len = 2;
597 /* FALLTHROUGH */
598 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
599 case EndpointOutRequest | USB_REQ_SET_FEATURE:
600 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
601 break;
602
603 /* CLASS REQUESTS (and errors) */
604
605 default:
48e82361 606nongeneric:
1da177e4 607 /* non-generic request */
b13296c6
DB		 608 switch (typeReq) {
609 case GetHubStatus:
610 case GetPortStatus:
611 len = 4;
612 break;
613 case GetHubDescriptor:
614 len = sizeof (struct usb_hub_descriptor);
615 break;
48e82361
SS		 616 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
617 /* len is returned by hub_control */
618 break;
1da177e4 619 }
b13296c6
DB		 620 status = hcd->driver->hub_control (hcd,
621 typeReq, wValue, wIndex,
622 tbuf, wLength);
d2123fd9
LT		 623
624 if (typeReq == GetHubDescriptor)
625 usb_hub_adjust_deviceremovable(hcd->self.root_hub,
626 (struct usb_hub_descriptor *)tbuf);
1da177e4
LT		 627 break;
628error:
629 /* "protocol stall" on error */
630 status = -EPIPE;
631 }
632
48e82361 633 if (status < 0) {
1da177e4
LT		 634 len = 0;
635 if (status != -EPIPE) {
636 dev_dbg (hcd->self.controller,
637 "CTRL: TypeReq=0x%x val=0x%x "
638 "idx=0x%x len=%d ==> %d\n",
639 typeReq, wValue, wIndex,
b13296c6 640 wLength, status);
1da177e4 641 }
48e82361
SS		 642 } else if (status > 0) {
643 /* hub_control may return the length of data copied. */
644 len = status;
645 status = 0;
1da177e4
LT		 646 }
647 if (len) {
648 if (urb->transfer_buffer_length < len)
649 len = urb->transfer_buffer_length;
650 urb->actual_length = len;
651 // always USB_DIR_IN, toward host
652 memcpy (ubuf, bufp, len);
653
654 /* report whether RH hardware supports remote wakeup */
655 if (patch_wakeup &&
656 len > offsetof (struct usb_config_descriptor,
657 bmAttributes))
658 ((struct usb_config_descriptor *)ubuf)->bmAttributes
659 |= USB_CONFIG_ATT_WAKEUP;
7329e211
AS		 660
661 /* report whether RH hardware has an integrated TT */
662 if (patch_protocol &&
663 len > offsetof(struct usb_device_descriptor,
664 bDeviceProtocol))
665 ((struct usb_device_descriptor *) ubuf)->
7bf01185 666 bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
1da177e4
LT		 667 }
668
669 /* any errors get returned through the urb completion */
9439eb94 670 spin_lock_irq(&hcd_root_hub_lock);
e9df41c5 671 usb_hcd_unlink_urb_from_ep(hcd, urb);
9439eb94
AS		 672
673 /* This peculiar use of spinlocks echoes what real HC drivers do.
674 * Avoiding calls to local_irq_disable/enable makes the code
675 * RT-friendly.
676 */
677 spin_unlock(&hcd_root_hub_lock);
4a00027d 678 usb_hcd_giveback_urb(hcd, urb, status);
9439eb94
AS		 679 spin_lock(&hcd_root_hub_lock);
680
681 spin_unlock_irq(&hcd_root_hub_lock);
1da177e4
LT		 682 return 0;
683}
684
685/*-------------------------------------------------------------------------*/
686
687/*
d5926ae7
AS		 688 * Root Hub interrupt transfers are polled using a timer if the
689 * driver requests it; otherwise the driver is responsible for
690 * calling usb_hcd_poll_rh_status() when an event occurs.
1da177e4 691 *
d5926ae7
AS		 692 * Completions are called in_interrupt(), but they may or may not
693 * be in_irq().
1da177e4 694 */
d5926ae7
AS		 695void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
696{
697 struct urb *urb;
698 int length;
699 unsigned long flags;
ad361c98 700 char buffer[6]; /* Any root hubs with > 31 ports? */
1da177e4 701
6d88e679 702 if (unlikely(!hcd->rh_pollable))
1b42ae6d 703 return;
d5926ae7
AS		 704 if (!hcd->uses_new_polling && !hcd->status_urb)
705 return;
1da177e4 706
d5926ae7
AS		 707 length = hcd->driver->hub_status_data(hcd, buffer);
708 if (length > 0) {
1da177e4 709
d5926ae7 710 /* try to complete the status urb */
9439eb94 711 spin_lock_irqsave(&hcd_root_hub_lock, flags);
d5926ae7
AS		 712 urb = hcd->status_urb;
713 if (urb) {
541c7d43 714 clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
e9df41c5 715 hcd->status_urb = NULL;
e9df41c5
AS		 716 urb->actual_length = length;
717 memcpy(urb->transfer_buffer, buffer, length);
9439eb94 718
e9df41c5 719 usb_hcd_unlink_urb_from_ep(hcd, urb);
9439eb94 720 spin_unlock(&hcd_root_hub_lock);
4a00027d 721 usb_hcd_giveback_urb(hcd, urb, 0);
9439eb94 722 spin_lock(&hcd_root_hub_lock);
e9df41c5 723 } else {
d5926ae7 724 length = 0;
541c7d43 725 set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
e9df41c5 726 }
9439eb94 727 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
1da177e4
LT		 728 }
729
d5926ae7 730 /* The USB 2.0 spec says 256 ms. This is close enough and won't
01cd0819
AV		 731 * exceed that limit if HZ is 100. The math is more clunky than
732 * maybe expected, this is to make sure that all timers for USB devices
25985edc 733 * fire at the same time to give the CPU a break in between */
541c7d43 734 if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
d5926ae7 735 (length == 0 && hcd->status_urb != NULL))
01cd0819 736 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
1da177e4 737}
d5926ae7 738EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
1da177e4
LT		 739
740/* timer callback */
d5926ae7
AS		 741static void rh_timer_func (unsigned long _hcd)
742{
743 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
744}
745
746/*-------------------------------------------------------------------------*/
1da177e4 747
d5926ae7 748static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
1da177e4 749{
d5926ae7 750 int retval;
1da177e4 751 unsigned long flags;
71d2718f 752 unsigned len = 1 + (urb->dev->maxchild / 8);
1da177e4 753
d5926ae7 754 spin_lock_irqsave (&hcd_root_hub_lock, flags);
e9df41c5 755 if (hcd->status_urb || urb->transfer_buffer_length < len) {
d5926ae7
AS		 756 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
757 retval = -EINVAL;
e9df41c5
AS		 758 goto done;
759 }
1da177e4 760
e9df41c5
AS		 761 retval = usb_hcd_link_urb_to_ep(hcd, urb);
762 if (retval)
763 goto done;
1da177e4 764
e9df41c5
AS		 765 hcd->status_urb = urb;
766 urb->hcpriv = hcd; /* indicate it's queued */
767 if (!hcd->uses_new_polling)
768 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
769
770 /* If a status change has already occurred, report it ASAP */
541c7d43 771 else if (HCD_POLL_PENDING(hcd))
e9df41c5
AS		 772 mod_timer(&hcd->rh_timer, jiffies);
773 retval = 0;
774 done:
d5926ae7
AS		 775 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
776 return retval;
1da177e4
LT		 777}
778
1da177e4
LT		 779static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
780{
5e60a161 781 if (usb_endpoint_xfer_int(&urb->ep->desc))
d5926ae7 782 return rh_queue_status (hcd, urb);
5e60a161 783 if (usb_endpoint_xfer_control(&urb->ep->desc))
1da177e4 784 return rh_call_control (hcd, urb);
d5926ae7 785 return -EINVAL;
1da177e4
LT		 786}
787
788/*-------------------------------------------------------------------------*/
789
455b25fb
AS		 790/* Unlinks of root-hub control URBs are legal, but they don't do anything
791 * since these URBs always execute synchronously.
d5926ae7 792 */
e9df41c5 793static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1da177e4 794{
455b25fb 795 unsigned long flags;
e9df41c5 796 int rc;
1da177e4 797
9439eb94 798 spin_lock_irqsave(&hcd_root_hub_lock, flags);
e9df41c5
AS		 799 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
800 if (rc)
801 goto done;
802
5e60a161 803 if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
455b25fb 804 ; /* Do nothing */
d5926ae7
AS		 805
806 } else { /* Status URB */
807 if (!hcd->uses_new_polling)
455b25fb 808 del_timer (&hcd->rh_timer);
d5926ae7
AS		 809 if (urb == hcd->status_urb) {
810 hcd->status_urb = NULL;
e9df41c5 811 usb_hcd_unlink_urb_from_ep(hcd, urb);
1da177e4 812
9439eb94 813 spin_unlock(&hcd_root_hub_lock);
4a00027d 814 usb_hcd_giveback_urb(hcd, urb, status);
9439eb94
AS		 815 spin_lock(&hcd_root_hub_lock);
816 }
817 }
e9df41c5 818 done:
9439eb94 819 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
e9df41c5 820 return rc;
1da177e4
LT		 821}
822
5234ce1b
IPG		 823
824
825/*
826 * Show & store the current value of authorized_default
827 */
828static ssize_t usb_host_authorized_default_show(struct device *dev,
829 struct device_attribute *attr,
830 char *buf)
831{
832 struct usb_device *rh_usb_dev = to_usb_device(dev);
833 struct usb_bus *usb_bus = rh_usb_dev->bus;
834 struct usb_hcd *usb_hcd;
835
836 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
837 return -ENODEV;
838 usb_hcd = bus_to_hcd(usb_bus);
839 return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default);
840}
841
842static ssize_t usb_host_authorized_default_store(struct device *dev,
843 struct device_attribute *attr,
844 const char *buf, size_t size)
845{
846 ssize_t result;
847 unsigned val;
848 struct usb_device *rh_usb_dev = to_usb_device(dev);
849 struct usb_bus *usb_bus = rh_usb_dev->bus;
850 struct usb_hcd *usb_hcd;
851
852 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
853 return -ENODEV;
854 usb_hcd = bus_to_hcd(usb_bus);
855 result = sscanf(buf, "%u\n", &val);
856 if (result == 1) {
857 usb_hcd->authorized_default = val? 1 : 0;
858 result = size;
859 }
860 else
861 result = -EINVAL;
862 return result;
863}
864
865static DEVICE_ATTR(authorized_default, 0644,
866 usb_host_authorized_default_show,
867 usb_host_authorized_default_store);
868
869
870/* Group all the USB bus attributes */
871static struct attribute *usb_bus_attrs[] = {
872 &dev_attr_authorized_default.attr,
873 NULL,
874};
875
876static struct attribute_group usb_bus_attr_group = {
877 .name = NULL, /* we want them in the same directory */
878 .attrs = usb_bus_attrs,
879};
880
881
882
1da177e4
LT		 883/*-------------------------------------------------------------------------*/
884
1da177e4
LT		 885/**
886 * usb_bus_init - shared initialization code
887 * @bus: the bus structure being initialized
888 *
889 * This code is used to initialize a usb_bus structure, memory for which is
890 * separately managed.
891 */
892static void usb_bus_init (struct usb_bus *bus)
893{
894 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
895
896 bus->devnum_next = 1;
897
898 bus->root_hub = NULL;
1da177e4
LT		 899 bus->busnum = -1;
900 bus->bandwidth_allocated = 0;
901 bus->bandwidth_int_reqs = 0;
902 bus->bandwidth_isoc_reqs = 0;
903
904 INIT_LIST_HEAD (&bus->bus_list);
1da177e4
LT		 905}
906
1da177e4
LT		 907/*-------------------------------------------------------------------------*/
908
909/**
910 * usb_register_bus - registers the USB host controller with the usb core
911 * @bus: pointer to the bus to register
912 * Context: !in_interrupt()
913 *
914 * Assigns a bus number, and links the controller into usbcore data
915 * structures so that it can be seen by scanning the bus list.
916 */
917static int usb_register_bus(struct usb_bus *bus)
918{
eb579f58 919 int result = -E2BIG;
1da177e4 920 int busnum;
1da177e4 921
4186ecf8 922 mutex_lock(&usb_bus_list_lock);
1da177e4 923 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
eb579f58 924 if (busnum >= USB_MAXBUS) {
1da177e4 925 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
eb579f58 926 goto error_find_busnum;
1da177e4 927 }
eb579f58
IPG		 928 set_bit (busnum, busmap.busmap);
929 bus->busnum = busnum;
5a3201b2 930
1da177e4
LT		 931 /* Add it to the local list of buses */
932 list_add (&bus->bus_list, &usb_bus_list);
4186ecf8 933 mutex_unlock(&usb_bus_list_lock);
1da177e4 934
3099e75a 935 usb_notify_add_bus(bus);
1da177e4 936
eb579f58
IPG		 937 dev_info (bus->controller, "new USB bus registered, assigned bus "
938 "number %d\n", bus->busnum);
1da177e4 939 return 0;
eb579f58 940
eb579f58
IPG		 941error_find_busnum:
942 mutex_unlock(&usb_bus_list_lock);
943 return result;
1da177e4
LT		 944}
945
946/**
947 * usb_deregister_bus - deregisters the USB host controller
948 * @bus: pointer to the bus to deregister
949 * Context: !in_interrupt()
950 *
951 * Recycles the bus number, and unlinks the controller from usbcore data
952 * structures so that it won't be seen by scanning the bus list.
953 */
954static void usb_deregister_bus (struct usb_bus *bus)
955{
956 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
957
958 /*
959 * NOTE: make sure that all the devices are removed by the
960 * controller code, as well as having it call this when cleaning
961 * itself up
962 */
4186ecf8 963 mutex_lock(&usb_bus_list_lock);
1da177e4 964 list_del (&bus->bus_list);
4186ecf8 965 mutex_unlock(&usb_bus_list_lock);
1da177e4 966
3099e75a 967 usb_notify_remove_bus(bus);
1da177e4
LT		 968
969 clear_bit (bus->busnum, busmap.busmap);
1da177e4
LT		 970}
971
972/**
8ec8d20b 973 * register_root_hub - called by usb_add_hcd() to register a root hub
1da177e4
LT		 974 * @hcd: host controller for this root hub
975 *
8ec8d20b 976 * This function registers the root hub with the USB subsystem. It sets up
b1e8f0a6
DB		 977 * the device properly in the device tree and then calls usb_new_device()
978 * to register the usb device. It also assigns the root hub's USB address
979 * (always 1).
1da177e4 980 */
b1e8f0a6 981static int register_root_hub(struct usb_hcd *hcd)
1da177e4
LT		 982{
983 struct device *parent_dev = hcd->self.controller;
b1e8f0a6 984 struct usb_device *usb_dev = hcd->self.root_hub;
1da177e4
LT		 985 const int devnum = 1;
986 int retval;
987
1da177e4
LT		 988 usb_dev->devnum = devnum;
989 usb_dev->bus->devnum_next = devnum + 1;
990 memset (&usb_dev->bus->devmap.devicemap, 0,
991 sizeof usb_dev->bus->devmap.devicemap);
992 set_bit (devnum, usb_dev->bus->devmap.devicemap);
993 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
994
4186ecf8 995 mutex_lock(&usb_bus_list_lock);
1da177e4 996
551509d2 997 usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
1da177e4
LT		 998 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
999 if (retval != sizeof usb_dev->descriptor) {
4186ecf8 1000 mutex_unlock(&usb_bus_list_lock);
1da177e4 1001 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
7071a3ce 1002 dev_name(&usb_dev->dev), retval);
1da177e4
LT		 1003 return (retval < 0) ? retval : -EMSGSIZE;
1004 }
448b6eb1
SS		 1005 if (usb_dev->speed == USB_SPEED_SUPER) {
1006 retval = usb_get_bos_descriptor(usb_dev);
1007 if (retval < 0) {
1008 mutex_unlock(&usb_bus_list_lock);
1009 dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
1010 dev_name(&usb_dev->dev), retval);
1011 return retval;
1012 }
1013 }
1da177e4 1014
1da177e4 1015 retval = usb_new_device (usb_dev);
1da177e4 1016 if (retval) {
1da177e4 1017 dev_err (parent_dev, "can't register root hub for %s, %d\n",
7071a3ce 1018 dev_name(&usb_dev->dev), retval);
0a231403 1019 } else {
1da177e4
LT		 1020 spin_lock_irq (&hcd_root_hub_lock);
1021 hcd->rh_registered = 1;
1022 spin_unlock_irq (&hcd_root_hub_lock);
1023
1024 /* Did the HC die before the root hub was registered? */
69fff59d 1025 if (HCD_DEAD(hcd))
1da177e4
LT		 1026 usb_hc_died (hcd); /* This time clean up */
1027 }
0a231403 1028 mutex_unlock(&usb_bus_list_lock);
1da177e4
LT		 1029
1030 return retval;
1031}
1da177e4 1032
da0aa716
AS		 1033/*
1034 * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
1035 * @bus: the bus which the root hub belongs to
1036 * @portnum: the port which is being resumed
1037 *
1038 * HCDs should call this function when they know that a resume signal is
1039 * being sent to a root-hub port. The root hub will be prevented from
1040 * going into autosuspend until usb_hcd_end_port_resume() is called.
1041 *
1042 * The bus's private lock must be held by the caller.
1043 */
1044void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
1045{
1046 unsigned bit = 1 << portnum;
1047
1048 if (!(bus->resuming_ports & bit)) {
1049 bus->resuming_ports |= bit;
1050 pm_runtime_get_noresume(&bus->root_hub->dev);
1051 }
1052}
1053EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);
1054
1055/*
1056 * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
1057 * @bus: the bus which the root hub belongs to
1058 * @portnum: the port which is being resumed
1059 *
1060 * HCDs should call this function when they know that a resume signal has
1061 * stopped being sent to a root-hub port. The root hub will be allowed to
1062 * autosuspend again.
1063 *
1064 * The bus's private lock must be held by the caller.
1065 */
1066void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
1067{
1068 unsigned bit = 1 << portnum;
1069
1070 if (bus->resuming_ports & bit) {
1071 bus->resuming_ports &= ~bit;
1072 pm_runtime_put_noidle(&bus->root_hub->dev);
1073 }
1074}
1075EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);
1da177e4
LT		 1076
1077/*-------------------------------------------------------------------------*/
1078
1079/**
1080 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
1081 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1082 * @is_input: true iff the transaction sends data to the host
1083 * @isoc: true for isochronous transactions, false for interrupt ones
1084 * @bytecount: how many bytes in the transaction.
1085 *
1086 * Returns approximate bus time in nanoseconds for a periodic transaction.
1087 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1088 * scheduled in software, this function is only used for such scheduling.
1089 */
1090long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1091{
1092 unsigned long tmp;
1093
1094 switch (speed) {
1095 case USB_SPEED_LOW: /* INTR only */
1096 if (is_input) {
1097 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
1098 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1099 } else {
1100 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
1101 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1102 }
1103 case USB_SPEED_FULL: /* ISOC or INTR */
1104 if (isoc) {
1105 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1106 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
1107 } else {
1108 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1109 return (9107L + BW_HOST_DELAY + tmp);
1110 }
1111 case USB_SPEED_HIGH: /* ISOC or INTR */
1112 // FIXME adjust for input vs output
1113 if (isoc)
498f78e6 1114 tmp = HS_NSECS_ISO (bytecount);
1da177e4 1115 else
498f78e6 1116 tmp = HS_NSECS (bytecount);
1da177e4
LT		 1117 return tmp;
1118 default:
1119 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1120 return -1;
1121 }
1122}
782e70c6 1123EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1da177e4 1124
1da177e4
LT		 1125
1126/*-------------------------------------------------------------------------*/
1127
1128/*
1129 * Generic HC operations.
1130 */
1131
1132/*-------------------------------------------------------------------------*/
1133
e9df41c5
AS		 1134/**
1135 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1136 * @hcd: host controller to which @urb was submitted
1137 * @urb: URB being submitted
1138 *
1139 * Host controller drivers should call this routine in their enqueue()
1140 * method. The HCD's private spinlock must be held and interrupts must
1141 * be disabled. The actions carried out here are required for URB
1142 * submission, as well as for endpoint shutdown and for usb_kill_urb.
1143 *
1144 * Returns 0 for no error, otherwise a negative error code (in which case
1145 * the enqueue() method must fail). If no error occurs but enqueue() fails
1146 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1147 * the private spinlock and returning.
1148 */
1149int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1da177e4 1150{
9a9bf406 1151 int rc = 0;
1da177e4 1152
e9df41c5 1153 spin_lock(&hcd_urb_list_lock);
1da177e4 1154
9a9bf406 1155 /* Check that the URB isn't being killed */
49367d8f 1156 if (unlikely(atomic_read(&urb->reject))) {
9a9bf406
AS		 1157 rc = -EPERM;
1158 goto done;
9f6a93f7 1159 }
1da177e4 1160
9a9bf406
AS		 1161 if (unlikely(!urb->ep->enabled)) {
1162 rc = -ENOENT;
1163 goto done;
1164 }
1da177e4 1165
6840d255
AS		 1166 if (unlikely(!urb->dev->can_submit)) {
1167 rc = -EHOSTUNREACH;
1168 goto done;
1169 }
1170
1da177e4 1171 /*
9a9bf406
AS		 1172 * Check the host controller's state and add the URB to the
1173 * endpoint's queue.
1da177e4 1174 */
9b37596a 1175 if (HCD_RH_RUNNING(hcd)) {
eb231054 1176 urb->unlinked = 0;
9a9bf406 1177 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
9b37596a 1178 } else {
9a9bf406
AS		 1179 rc = -ESHUTDOWN;
1180 goto done;
1da177e4 1181 }
9a9bf406 1182 done:
e9df41c5 1183 spin_unlock(&hcd_urb_list_lock);
9a9bf406
AS		 1184 return rc;
1185}
e9df41c5 1186EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
9a9bf406 1187
e9df41c5
AS		 1188/**
1189 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1190 * @hcd: host controller to which @urb was submitted
1191 * @urb: URB being checked for unlinkability
1192 * @status: error code to store in @urb if the unlink succeeds
1193 *
1194 * Host controller drivers should call this routine in their dequeue()
1195 * method. The HCD's private spinlock must be held and interrupts must
1196 * be disabled. The actions carried out here are required for making
1197 * sure than an unlink is valid.
1198 *
1199 * Returns 0 for no error, otherwise a negative error code (in which case
1200 * the dequeue() method must fail). The possible error codes are:
1201 *
1202 * -EIDRM: @urb was not submitted or has already completed.
1203 * The completion function may not have been called yet.
1204 *
1205 * -EBUSY: @urb has already been unlinked.
1206 */
1207int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
9a9bf406
AS		 1208 int status)
1209{
9a9bf406 1210 struct list_head *tmp;
9a9bf406
AS		 1211
1212 /* insist the urb is still queued */
1213 list_for_each(tmp, &urb->ep->urb_list) {
1214 if (tmp == &urb->urb_list)
1215 break;
1216 }
e9df41c5
AS		 1217 if (tmp != &urb->urb_list)
1218 return -EIDRM;
1da177e4 1219
9a9bf406
AS		 1220 /* Any status except -EINPROGRESS means something already started to
1221 * unlink this URB from the hardware. So there's no more work to do.
1da177e4 1222 */
eb231054 1223 if (urb->unlinked)
e9df41c5 1224 return -EBUSY;
eb231054 1225 urb->unlinked = status;
e9df41c5 1226 return 0;
9a9bf406 1227}
e9df41c5 1228EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
9a9bf406 1229
e9df41c5
AS		 1230/**
1231 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1232 * @hcd: host controller to which @urb was submitted
1233 * @urb: URB being unlinked
1234 *
1235 * Host controller drivers should call this routine before calling
1236 * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
1237 * interrupts must be disabled. The actions carried out here are required
1238 * for URB completion.
1239 */
1240void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
9a9bf406 1241{
9a9bf406 1242 /* clear all state linking urb to this dev (and hcd) */
e9df41c5 1243 spin_lock(&hcd_urb_list_lock);
9a9bf406 1244 list_del_init(&urb->urb_list);
e9df41c5 1245 spin_unlock(&hcd_urb_list_lock);
9a9bf406 1246}
e9df41c5 1247EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
9a9bf406 1248
b3476675
MD		 1249/*
1250 * Some usb host controllers can only perform dma using a small SRAM area.
1251 * The usb core itself is however optimized for host controllers that can dma
1252 * using regular system memory - like pci devices doing bus mastering.
1253 *
1254 * To support host controllers with limited dma capabilites we provide dma
1255 * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
1256 * For this to work properly the host controller code must first use the
1257 * function dma_declare_coherent_memory() to point out which memory area
1258 * that should be used for dma allocations.
1259 *
1260 * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
1261 * dma using dma_alloc_coherent() which in turn allocates from the memory
1262 * area pointed out with dma_declare_coherent_memory().
1263 *
1264 * So, to summarize...
1265 *
1266 * - We need "local" memory, canonical example being
1267 * a small SRAM on a discrete controller being the
1268 * only memory that the controller can read ...
1269 * (a) "normal" kernel memory is no good, and
1270 * (b) there's not enough to share
1271 *
1272 * - The only *portable* hook for such stuff in the
1273 * DMA framework is dma_declare_coherent_memory()
1274 *
1275 * - So we use that, even though the primary requirement
1276 * is that the memory be "local" (hence addressible
1277 * by that device), not "coherent".
1278 *
1279 */
1280
1281static int hcd_alloc_coherent(struct usb_bus *bus,
1282 gfp_t mem_flags, dma_addr_t *dma_handle,
1283 void **vaddr_handle, size_t size,
1284 enum dma_data_direction dir)
1285{
1286 unsigned char *vaddr;
1287
4307a28e
AR		 1288 if (*vaddr_handle == NULL) {
1289 WARN_ON_ONCE(1);
1290 return -EFAULT;
1291 }
1292
b3476675
MD		 1293 vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
1294 mem_flags, dma_handle);
1295 if (!vaddr)
1296 return -ENOMEM;
1297
1298 /*
1299 * Store the virtual address of the buffer at the end
1300 * of the allocated dma buffer. The size of the buffer
1301 * may be uneven so use unaligned functions instead
1302 * of just rounding up. It makes sense to optimize for
1303 * memory footprint over access speed since the amount
1304 * of memory available for dma may be limited.
1305 */
1306 put_unaligned((unsigned long)*vaddr_handle,
1307 (unsigned long *)(vaddr + size));
1308
1309 if (dir == DMA_TO_DEVICE)
1310 memcpy(vaddr, *vaddr_handle, size);
1311
1312 *vaddr_handle = vaddr;
1313 return 0;
1314}
1315
1316static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1317 void **vaddr_handle, size_t size,
1318 enum dma_data_direction dir)
1319{
1320 unsigned char *vaddr = *vaddr_handle;
1321
1322 vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1323
1324 if (dir == DMA_FROM_DEVICE)
1325 memcpy(vaddr, *vaddr_handle, size);
1326
1327 hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1328
1329 *vaddr_handle = vaddr;
1330 *dma_handle = 0;
1331}
1332
c8cf203a 1333void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
ff9c895f 1334{
ff9c895f
AS		 1335 if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
1336 dma_unmap_single(hcd->self.controller,
1337 urb->setup_dma,
1338 sizeof(struct usb_ctrlrequest),
1339 DMA_TO_DEVICE);
1340 else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1341 hcd_free_coherent(urb->dev->bus,
1342 &urb->setup_dma,
1343 (void **) &urb->setup_packet,
1344 sizeof(struct usb_ctrlrequest),
1345 DMA_TO_DEVICE);
1346
1dae423d
MF		 1347 /* Make it safe to call this routine more than once */
1348 urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1349}
c8cf203a 1350EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
1dae423d 1351
2694a48d
RM		 1352static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1353{
1354 if (hcd->driver->unmap_urb_for_dma)
1355 hcd->driver->unmap_urb_for_dma(hcd, urb);
1356 else
1357 usb_hcd_unmap_urb_for_dma(hcd, urb);
1358}
1359
c8cf203a 1360void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1dae423d
MF		 1361{
1362 enum dma_data_direction dir;
1363
c8cf203a 1364 usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
1dae423d 1365
ff9c895f
AS		 1366 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1367 if (urb->transfer_flags & URB_DMA_MAP_SG)
1368 dma_unmap_sg(hcd->self.controller,
910f8d0c 1369 urb->sg,
ff9c895f
AS		 1370 urb->num_sgs,
1371 dir);
1372 else if (urb->transfer_flags & URB_DMA_MAP_PAGE)
1373 dma_unmap_page(hcd->self.controller,
1374 urb->transfer_dma,
1375 urb->transfer_buffer_length,
1376 dir);
1377 else if (urb->transfer_flags & URB_DMA_MAP_SINGLE)
1378 dma_unmap_single(hcd->self.controller,
1379 urb->transfer_dma,
1380 urb->transfer_buffer_length,
1381 dir);
1382 else if (urb->transfer_flags & URB_MAP_LOCAL)
1383 hcd_free_coherent(urb->dev->bus,
1384 &urb->transfer_dma,
1385 &urb->transfer_buffer,
1386 urb->transfer_buffer_length,
1387 dir);
1388
1389 /* Make it safe to call this routine more than once */
1dae423d 1390 urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
ff9c895f
AS		 1391 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1392}
c8cf203a 1393EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
ff9c895f 1394
b3476675
MD		 1395static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1396 gfp_t mem_flags)
2694a48d
RM		 1397{
1398 if (hcd->driver->map_urb_for_dma)
1399 return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
1400 else
1401 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
1402}
1403
1404int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1405 gfp_t mem_flags)
9a9bf406 1406{
b3476675
MD		 1407 enum dma_data_direction dir;
1408 int ret = 0;
1409
9a9bf406
AS		 1410 /* Map the URB's buffers for DMA access.
1411 * Lower level HCD code should use *_dma exclusively,
e04748e3
SS		 1412 * unless it uses pio or talks to another transport,
1413 * or uses the provided scatter gather list for bulk.
1da177e4 1414 */
b3476675 1415
85bcb5ee 1416 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
07a8cdd2
AG		 1417 if (hcd->self.uses_pio_for_control)
1418 return ret;
85e034fd 1419 if (hcd->self.uses_dma) {
b3476675 1420 urb->setup_dma = dma_map_single(
1da177e4
LT		 1421 hcd->self.controller,
1422 urb->setup_packet,
b3476675 1423 sizeof(struct usb_ctrlrequest),
1da177e4 1424 DMA_TO_DEVICE);
85e034fd
LF		 1425 if (dma_mapping_error(hcd->self.controller,
1426 urb->setup_dma))
1427 return -EAGAIN;
ff9c895f 1428 urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
f537da68 1429 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
b3476675
MD		 1430 ret = hcd_alloc_coherent(
1431 urb->dev->bus, mem_flags,
1432 &urb->setup_dma,
1433 (void **)&urb->setup_packet,
1434 sizeof(struct usb_ctrlrequest),
1435 DMA_TO_DEVICE);
ff9c895f
AS		 1436 if (ret)
1437 return ret;
1438 urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
f537da68 1439 }
b3476675
MD		 1440 }
1441
1442 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
ff9c895f 1443 if (urb->transfer_buffer_length != 0
b3476675 1444 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
85e034fd 1445 if (hcd->self.uses_dma) {
ff9c895f 1446 if (urb->num_sgs) {
fe2072cc
HG		 1447 int n;
1448
1449 /* We don't support sg for isoc transfers ! */
1450 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1451 WARN_ON(1);
1452 return -EINVAL;
1453 }
1454
1455 n = dma_map_sg(
ff9c895f 1456 hcd->self.controller,
910f8d0c 1457 urb->sg,
ff9c895f
AS		 1458 urb->num_sgs,
1459 dir);
1460 if (n <= 0)
1461 ret = -EAGAIN;
1462 else
1463 urb->transfer_flags |= URB_DMA_MAP_SG;
bc677d5b
CL		 1464 urb->num_mapped_sgs = n;
1465 if (n != urb->num_sgs)
ff9c895f
AS		 1466 urb->transfer_flags |=
1467 URB_DMA_SG_COMBINED;
ff9c895f 1468 } else if (urb->sg) {
910f8d0c 1469 struct scatterlist *sg = urb->sg;
ff9c895f
AS		 1470 urb->transfer_dma = dma_map_page(
1471 hcd->self.controller,
1472 sg_page(sg),
1473 sg->offset,
1474 urb->transfer_buffer_length,
1475 dir);
1476 if (dma_mapping_error(hcd->self.controller,
85e034fd 1477 urb->transfer_dma))
ff9c895f
AS		 1478 ret = -EAGAIN;
1479 else
1480 urb->transfer_flags |= URB_DMA_MAP_PAGE;
1481 } else {
1482 urb->transfer_dma = dma_map_single(
1483 hcd->self.controller,
1484 urb->transfer_buffer,
1485 urb->transfer_buffer_length,
1486 dir);
1487 if (dma_mapping_error(hcd->self.controller,
1488 urb->transfer_dma))
1489 ret = -EAGAIN;
1490 else
1491 urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1492 }
85e034fd 1493 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
b3476675
MD		 1494 ret = hcd_alloc_coherent(
1495 urb->dev->bus, mem_flags,
1496 &urb->transfer_dma,
1497 &urb->transfer_buffer,
1498 urb->transfer_buffer_length,
1499 dir);
ff9c895f
AS		 1500 if (ret == 0)
1501 urb->transfer_flags |= URB_MAP_LOCAL;
b3476675 1502 }
ff9c895f
AS		 1503 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1504 URB_SETUP_MAP_LOCAL)))
c8cf203a 1505 usb_hcd_unmap_urb_for_dma(hcd, urb);
1da177e4 1506 }
b3476675 1507 return ret;
9a9bf406 1508}
2694a48d 1509EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
1da177e4 1510
9a9bf406
AS		 1511/*-------------------------------------------------------------------------*/
1512
1513/* may be called in any context with a valid urb->dev usecount
1514 * caller surrenders "ownership" of urb
1515 * expects usb_submit_urb() to have sanity checked and conditioned all
1516 * inputs in the urb
1517 */
1518int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1519{
1520 int status;
1521 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1522
1523 /* increment urb's reference count as part of giving it to the HCD
1524 * (which will control it). HCD guarantees that it either returns
1525 * an error or calls giveback(), but not both.
1526 */
1527 usb_get_urb(urb);
1528 atomic_inc(&urb->use_count);
4d59d8a1 1529 atomic_inc(&urb->dev->urbnum);
9a9bf406
AS		 1530 usbmon_urb_submit(&hcd->self, urb);
1531
1532 /* NOTE requirements on root-hub callers (usbfs and the hub
1533 * driver, for now): URBs' urb->transfer_buffer must be
1534 * valid and usb_buffer_{sync,unmap}() not be needed, since
1535 * they could clobber root hub response data. Also, control
1536 * URBs must be submitted in process context with interrupts
1537 * enabled.
1538 */
b3476675 1539
ff9c895f 1540 if (is_root_hub(urb->dev)) {
e9df41c5 1541 status = rh_urb_enqueue(hcd, urb);
ff9c895f
AS		 1542 } else {
1543 status = map_urb_for_dma(hcd, urb, mem_flags);
1544 if (likely(status == 0)) {
1545 status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1546 if (unlikely(status))
2694a48d 1547 unmap_urb_for_dma(hcd, urb);
ff9c895f
AS		 1548 }
1549 }
9a9bf406
AS		 1550
1551 if (unlikely(status)) {
1da177e4 1552 usbmon_urb_submit_error(&hcd->self, urb, status);
b0d9efba 1553 urb->hcpriv = NULL;
9a9bf406
AS		 1554 INIT_LIST_HEAD(&urb->urb_list);
1555 atomic_dec(&urb->use_count);
4d59d8a1 1556 atomic_dec(&urb->dev->urbnum);
49367d8f 1557 if (atomic_read(&urb->reject))
9a9bf406
AS		 1558 wake_up(&usb_kill_urb_queue);
1559 usb_put_urb(urb);
1da177e4
LT		 1560 }
1561 return status;
1562}
1563
1564/*-------------------------------------------------------------------------*/
1565
1da177e4
LT		 1566/* this makes the hcd giveback() the urb more quickly, by kicking it
1567 * off hardware queues (which may take a while) and returning it as
1568 * soon as practical. we've already set up the urb's return status,
1569 * but we can't know if the callback completed already.
1570 */
e9df41c5 1571static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1da177e4
LT		 1572{
1573 int value;
1574
809a58b8 1575 if (is_root_hub(urb->dev))
e9df41c5 1576 value = usb_rh_urb_dequeue(hcd, urb, status);
1da177e4
LT		 1577 else {
1578
1579 /* The only reason an HCD might fail this call is if
1580 * it has not yet fully queued the urb to begin with.
1581 * Such failures should be harmless. */
e9df41c5 1582 value = hcd->driver->urb_dequeue(hcd, urb, status);
1da177e4 1583 }
1da177e4
LT		 1584 return value;
1585}
1586
1587/*
1588 * called in any context
1589 *
1590 * caller guarantees urb won't be recycled till both unlink()
1591 * and the urb's completion function return
1592 */
a6d2bb9f 1593int usb_hcd_unlink_urb (struct urb *urb, int status)
1da177e4 1594{
9a9bf406 1595 struct usb_hcd *hcd;
cde217a5
AS		 1596 int retval = -EIDRM;
1597 unsigned long flags;
1da177e4 1598
cde217a5
AS		 1599 /* Prevent the device and bus from going away while
1600 * the unlink is carried out. If they are already gone
1601 * then urb->use_count must be 0, since disconnected
1602 * devices can't have any active URBs.
1603 */
1604 spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1605 if (atomic_read(&urb->use_count) > 0) {
1606 retval = 0;
1607 usb_get_dev(urb->dev);
1608 }
1609 spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1610 if (retval == 0) {
1611 hcd = bus_to_hcd(urb->dev->bus);
1612 retval = unlink1(hcd, urb, status);
1613 usb_put_dev(urb->dev);
1614 }
1da177e4 1615
1da177e4
LT		 1616 if (retval == 0)
1617 retval = -EINPROGRESS;
e9df41c5 1618 else if (retval != -EIDRM && retval != -EBUSY)
9a9bf406
AS		 1619 dev_dbg(&urb->dev->dev, "hcd_unlink_urb %p fail %d\n",
1620 urb, retval);
1da177e4
LT		 1621 return retval;
1622}
1623
1624/*-------------------------------------------------------------------------*/
1625
32aca560
AS		 1626/**
1627 * usb_hcd_giveback_urb - return URB from HCD to device driver
1628 * @hcd: host controller returning the URB
1629 * @urb: urb being returned to the USB device driver.
4a00027d 1630 * @status: completion status code for the URB.
32aca560
AS		 1631 * Context: in_interrupt()
1632 *
1633 * This hands the URB from HCD to its USB device driver, using its
1634 * completion function. The HCD has freed all per-urb resources
1635 * (and is done using urb->hcpriv). It also released all HCD locks;
1636 * the device driver won't cause problems if it frees, modifies,
1637 * or resubmits this URB.
eb231054 1638 *
4a00027d 1639 * If @urb was unlinked, the value of @status will be overridden by
eb231054
AS		 1640 * @urb->unlinked. Erroneous short transfers are detected in case
1641 * the HCD hasn't checked for them.
32aca560 1642 */
4a00027d 1643void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
32aca560 1644{
b0d9efba 1645 urb->hcpriv = NULL;
eb231054 1646 if (unlikely(urb->unlinked))
4a00027d 1647 status = urb->unlinked;
eb231054 1648 else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
b0d9efba 1649 urb->actual_length < urb->transfer_buffer_length &&
4a00027d
AS		 1650 !status))
1651 status = -EREMOTEIO;
32aca560 1652
2694a48d 1653 unmap_urb_for_dma(hcd, urb);
4a00027d 1654 usbmon_urb_complete(&hcd->self, urb, status);
1f5a3d0f
AS		 1655 usb_unanchor_urb(urb);
1656
32aca560 1657 /* pass ownership to the completion handler */
4a00027d 1658 urb->status = status;
32aca560
AS		 1659 urb->complete (urb);
1660 atomic_dec (&urb->use_count);
49367d8f 1661 if (unlikely(atomic_read(&urb->reject)))
32aca560
AS		 1662 wake_up (&usb_kill_urb_queue);
1663 usb_put_urb (urb);
1664}
782e70c6 1665EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
32aca560
AS		 1666
1667/*-------------------------------------------------------------------------*/
1668
95cf82f9
AS		 1669/* Cancel all URBs pending on this endpoint and wait for the endpoint's
1670 * queue to drain completely. The caller must first insure that no more
1671 * URBs can be submitted for this endpoint.
1da177e4 1672 */
95cf82f9 1673void usb_hcd_flush_endpoint(struct usb_device *udev,
a6d2bb9f 1674 struct usb_host_endpoint *ep)
1da177e4
LT		 1675{
1676 struct usb_hcd *hcd;
1677 struct urb *urb;
1678
95cf82f9
AS		 1679 if (!ep)
1680 return;
9a9bf406 1681 might_sleep();
17200583 1682 hcd = bus_to_hcd(udev->bus);
1da177e4 1683
95cf82f9 1684 /* No more submits can occur */
9a9bf406 1685 spin_lock_irq(&hcd_urb_list_lock);
ddc1fd6a 1686rescan:
1da177e4 1687 list_for_each_entry (urb, &ep->urb_list, urb_list) {
5e60a161 1688 int is_in;
1da177e4 1689
eb231054 1690 if (urb->unlinked)
1da177e4
LT		 1691 continue;
1692 usb_get_urb (urb);
5e60a161 1693 is_in = usb_urb_dir_in(urb);
809a58b8 1694 spin_unlock(&hcd_urb_list_lock);
1da177e4 1695
e9df41c5
AS		 1696 /* kick hcd */
1697 unlink1(hcd, urb, -ESHUTDOWN);
1698 dev_dbg (hcd->self.controller,
1699 "shutdown urb %p ep%d%s%s\n",
1700 urb, usb_endpoint_num(&ep->desc),
1701 is_in ? "in" : "out",
1702 ({ char *s;
1703
1704 switch (usb_endpoint_type(&ep->desc)) {
1705 case USB_ENDPOINT_XFER_CONTROL:
1706 s = ""; break;
1707 case USB_ENDPOINT_XFER_BULK:
1708 s = "-bulk"; break;
1709 case USB_ENDPOINT_XFER_INT:
1710 s = "-intr"; break;
1711 default:
1712 s = "-iso"; break;
1713 };
1714 s;
1715 }));
1da177e4
LT		 1716 usb_put_urb (urb);
1717
1718 /* list contents may have changed */
ddc1fd6a 1719 spin_lock(&hcd_urb_list_lock);
1da177e4
LT		 1720 goto rescan;
1721 }
9a9bf406 1722 spin_unlock_irq(&hcd_urb_list_lock);
1da177e4 1723
95cf82f9 1724 /* Wait until the endpoint queue is completely empty */
455b25fb 1725 while (!list_empty (&ep->urb_list)) {
809a58b8 1726 spin_lock_irq(&hcd_urb_list_lock);
455b25fb
AS		 1727
1728 /* The list may have changed while we acquired the spinlock */
1729 urb = NULL;
1730 if (!list_empty (&ep->urb_list)) {
1731 urb = list_entry (ep->urb_list.prev, struct urb,
1732 urb_list);
1733 usb_get_urb (urb);
1734 }
809a58b8 1735 spin_unlock_irq(&hcd_urb_list_lock);
455b25fb
AS		 1736
1737 if (urb) {
1738 usb_kill_urb (urb);
1739 usb_put_urb (urb);
1740 }
1741 }
1da177e4
LT		 1742}
1743
3f0479e0 1744/**
70445ae6
RD		 1745 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1746 * the bus bandwidth
1747 * @udev: target &usb_device
3f0479e0
SS		 1748 * @new_config: new configuration to install
1749 * @cur_alt: the current alternate interface setting
1750 * @new_alt: alternate interface setting that is being installed
1751 *
1752 * To change configurations, pass in the new configuration in new_config,
1753 * and pass NULL for cur_alt and new_alt.
1754 *
1755 * To reset a device's configuration (put the device in the ADDRESSED state),
1756 * pass in NULL for new_config, cur_alt, and new_alt.
1757 *
1758 * To change alternate interface settings, pass in NULL for new_config,
1759 * pass in the current alternate interface setting in cur_alt,
1760 * and pass in the new alternate interface setting in new_alt.
1761 *
1762 * Returns an error if the requested bandwidth change exceeds the
1763 * bus bandwidth or host controller internal resources.
79abb1ab 1764 */
3f0479e0 1765int usb_hcd_alloc_bandwidth(struct usb_device *udev,
79abb1ab 1766 struct usb_host_config *new_config,
3f0479e0
SS		 1767 struct usb_host_interface *cur_alt,
1768 struct usb_host_interface *new_alt)
79abb1ab
SS		 1769{
1770 int num_intfs, i, j;
576a362a 1771 struct usb_host_interface *alt = NULL;
79abb1ab
SS		 1772 int ret = 0;
1773 struct usb_hcd *hcd;
1774 struct usb_host_endpoint *ep;
1775
1776 hcd = bus_to_hcd(udev->bus);
1777 if (!hcd->driver->check_bandwidth)
1778 return 0;
1779
1780 /* Configuration is being removed - set configuration 0 */
3f0479e0 1781 if (!new_config && !cur_alt) {
79abb1ab
SS		 1782 for (i = 1; i < 16; ++i) {
1783 ep = udev->ep_out[i];
1784 if (ep)
1785 hcd->driver->drop_endpoint(hcd, udev, ep);
1786 ep = udev->ep_in[i];
1787 if (ep)
1788 hcd->driver->drop_endpoint(hcd, udev, ep);
1789 }
1790 hcd->driver->check_bandwidth(hcd, udev);
1791 return 0;
1792 }
1793 /* Check if the HCD says there's enough bandwidth. Enable all endpoints
1794 * each interface's alt setting 0 and ask the HCD to check the bandwidth
1795 * of the bus. There will always be bandwidth for endpoint 0, so it's
1796 * ok to exclude it.
1797 */
1798 if (new_config) {
1799 num_intfs = new_config->desc.bNumInterfaces;
1800 /* Remove endpoints (except endpoint 0, which is always on the
1801 * schedule) from the old config from the schedule
1802 */
1803 for (i = 1; i < 16; ++i) {
1804 ep = udev->ep_out[i];
1805 if (ep) {
1806 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1807 if (ret < 0)
1808 goto reset;
1809 }
1810 ep = udev->ep_in[i];
1811 if (ep) {
1812 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1813 if (ret < 0)
1814 goto reset;
1815 }
1816 }
1817 for (i = 0; i < num_intfs; ++i) {
d837e219
SS		 1818 struct usb_host_interface *first_alt;
1819 int iface_num;
1820
1821 first_alt = &new_config->intf_cache[i]->altsetting[0];
1822 iface_num = first_alt->desc.bInterfaceNumber;
91017f9c 1823 /* Set up endpoints for alternate interface setting 0 */
d837e219 1824 alt = usb_find_alt_setting(new_config, iface_num, 0);
3f0479e0
SS		 1825 if (!alt)
1826 /* No alt setting 0? Pick the first setting. */
d837e219 1827 alt = first_alt;
3f0479e0 1828
79abb1ab
SS		 1829 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
1830 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
1831 if (ret < 0)
1832 goto reset;
1833 }
1834 }
1835 }
3f0479e0 1836 if (cur_alt && new_alt) {
04a723ea
SS		 1837 struct usb_interface *iface = usb_ifnum_to_if(udev,
1838 cur_alt->desc.bInterfaceNumber);
1839
8a9af4fd
SS		 1840 if (!iface)
1841 return -EINVAL;
04a723ea
SS		 1842 if (iface->resetting_device) {
1843 /*
1844 * The USB core just reset the device, so the xHCI host
1845 * and the device will think alt setting 0 is installed.
1846 * However, the USB core will pass in the alternate
1847 * setting installed before the reset as cur_alt. Dig
1848 * out the alternate setting 0 structure, or the first
1849 * alternate setting if a broken device doesn't have alt
1850 * setting 0.
1851 */
1852 cur_alt = usb_altnum_to_altsetting(iface, 0);
1853 if (!cur_alt)
1854 cur_alt = &iface->altsetting[0];
1855 }
1856
3f0479e0
SS		 1857 /* Drop all the endpoints in the current alt setting */
1858 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
1859 ret = hcd->driver->drop_endpoint(hcd, udev,
1860 &cur_alt->endpoint[i]);
1861 if (ret < 0)
1862 goto reset;
1863 }
1864 /* Add all the endpoints in the new alt setting */
1865 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
1866 ret = hcd->driver->add_endpoint(hcd, udev,
1867 &new_alt->endpoint[i]);
1868 if (ret < 0)
1869 goto reset;
1870 }
1871 }
79abb1ab
SS		 1872 ret = hcd->driver->check_bandwidth(hcd, udev);
1873reset:
1874 if (ret < 0)
1875 hcd->driver->reset_bandwidth(hcd, udev);
1876 return ret;
1877}
1878
95cf82f9
AS		 1879/* Disables the endpoint: synchronizes with the hcd to make sure all
1880 * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
1881 * have been called previously. Use for set_configuration, set_interface,
1882 * driver removal, physical disconnect.
1883 *
1884 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1885 * type, maxpacket size, toggle, halt status, and scheduling.
1886 */
1887void usb_hcd_disable_endpoint(struct usb_device *udev,
1888 struct usb_host_endpoint *ep)
1889{
1890 struct usb_hcd *hcd;
1891
1892 might_sleep();
1893 hcd = bus_to_hcd(udev->bus);
1894 if (hcd->driver->endpoint_disable)
1895 hcd->driver->endpoint_disable(hcd, ep);
1896}
1897
3444b26a
DV		 1898/**
1899 * usb_hcd_reset_endpoint - reset host endpoint state
1900 * @udev: USB device.
1901 * @ep: the endpoint to reset.
1902 *
1903 * Resets any host endpoint state such as the toggle bit, sequence
1904 * number and current window.
1905 */
1906void usb_hcd_reset_endpoint(struct usb_device *udev,
1907 struct usb_host_endpoint *ep)
1908{
1909 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1910
1911 if (hcd->driver->endpoint_reset)
1912 hcd->driver->endpoint_reset(hcd, ep);
1913 else {
1914 int epnum = usb_endpoint_num(&ep->desc);
1915 int is_out = usb_endpoint_dir_out(&ep->desc);
1916 int is_control = usb_endpoint_xfer_control(&ep->desc);
1917
1918 usb_settoggle(udev, epnum, is_out, 0);
1919 if (is_control)
1920 usb_settoggle(udev, epnum, !is_out, 0);
1921 }
1922}
1923
eab1cafc
SS		 1924/**
1925 * usb_alloc_streams - allocate bulk endpoint stream IDs.
1926 * @interface: alternate setting that includes all endpoints.
1927 * @eps: array of endpoints that need streams.
1928 * @num_eps: number of endpoints in the array.
1929 * @num_streams: number of streams to allocate.
1930 * @mem_flags: flags hcd should use to allocate memory.
1931 *
1932 * Sets up a group of bulk endpoints to have num_streams stream IDs available.
1933 * Drivers may queue multiple transfers to different stream IDs, which may
1934 * complete in a different order than they were queued.
1935 */
1936int usb_alloc_streams(struct usb_interface *interface,
1937 struct usb_host_endpoint **eps, unsigned int num_eps,
1938 unsigned int num_streams, gfp_t mem_flags)
1939{
1940 struct usb_hcd *hcd;
1941 struct usb_device *dev;
1942 int i;
1943
1944 dev = interface_to_usbdev(interface);
1945 hcd = bus_to_hcd(dev->bus);
1946 if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
1947 return -EINVAL;
1948 if (dev->speed != USB_SPEED_SUPER)
1949 return -EINVAL;
1950
1951 /* Streams only apply to bulk endpoints. */
1952 for (i = 0; i < num_eps; i++)
1953 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
1954 return -EINVAL;
1955
1956 return hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
1957 num_streams, mem_flags);
1958}
1959EXPORT_SYMBOL_GPL(usb_alloc_streams);
1960
1961/**
1962 * usb_free_streams - free bulk endpoint stream IDs.
1963 * @interface: alternate setting that includes all endpoints.
1964 * @eps: array of endpoints to remove streams from.
1965 * @num_eps: number of endpoints in the array.
1966 * @mem_flags: flags hcd should use to allocate memory.
1967 *
1968 * Reverts a group of bulk endpoints back to not using stream IDs.
1969 * Can fail if we are given bad arguments, or HCD is broken.
1970 */
1971void usb_free_streams(struct usb_interface *interface,
1972 struct usb_host_endpoint **eps, unsigned int num_eps,
1973 gfp_t mem_flags)
1974{
1975 struct usb_hcd *hcd;
1976 struct usb_device *dev;
1977 int i;
1978
1979 dev = interface_to_usbdev(interface);
1980 hcd = bus_to_hcd(dev->bus);
1981 if (dev->speed != USB_SPEED_SUPER)
1982 return;
1983
1984 /* Streams only apply to bulk endpoints. */
1985 for (i = 0; i < num_eps; i++)
b214f191 1986 if (!eps[i] || !usb_endpoint_xfer_bulk(&eps[i]->desc))
eab1cafc
SS		 1987 return;
1988
1989 hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
1990}
1991EXPORT_SYMBOL_GPL(usb_free_streams);
1992
cde217a5
AS		 1993/* Protect against drivers that try to unlink URBs after the device
1994 * is gone, by waiting until all unlinks for @udev are finished.
1995 * Since we don't currently track URBs by device, simply wait until
1996 * nothing is running in the locked region of usb_hcd_unlink_urb().
1997 */
1998void usb_hcd_synchronize_unlinks(struct usb_device *udev)
1999{
2000 spin_lock_irq(&hcd_urb_unlink_lock);
2001 spin_unlock_irq(&hcd_urb_unlink_lock);
2002}
2003
1da177e4
LT		 2004/*-------------------------------------------------------------------------*/
2005
32aca560
AS		 2006/* called in any context */
2007int usb_hcd_get_frame_number (struct usb_device *udev)
2008{
2009 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2010
9b37596a 2011 if (!HCD_RH_RUNNING(hcd))
32aca560
AS		 2012 return -ESHUTDOWN;
2013 return hcd->driver->get_frame_number (hcd);
2014}
2015
2016/*-------------------------------------------------------------------------*/
2017
9293677a 2018#ifdef CONFIG_PM
1da177e4 2019
65bfd296 2020int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
1da177e4 2021{
686314cf
AS		 2022 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
2023 int status;
2024 int old_state = hcd->state;
1da177e4 2025
30b1a7a3
AS		 2026 dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
2027 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
2028 rhdev->do_remote_wakeup);
9b37596a
AS		 2029 if (HCD_DEAD(hcd)) {
2030 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
2031 return 0;
2032 }
2033
686314cf
AS		 2034 if (!hcd->driver->bus_suspend) {
2035 status = -ENOENT;
2036 } else {
9b37596a 2037 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
686314cf
AS		 2038 hcd->state = HC_STATE_QUIESCING;
2039 status = hcd->driver->bus_suspend(hcd);
2040 }
2041 if (status == 0) {
2042 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
9293677a 2043 hcd->state = HC_STATE_SUSPENDED;
879d38e6
AS		 2044
2045 /* Did we race with a root-hub wakeup event? */
2046 if (rhdev->do_remote_wakeup) {
2047 char buffer[6];
2048
2049 status = hcd->driver->hub_status_data(hcd, buffer);
2050 if (status != 0) {
2051 dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
2052 hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
2053 status = -EBUSY;
2054 }
2055 }
686314cf 2056 } else {
9b37596a
AS		 2057 spin_lock_irq(&hcd_root_hub_lock);
2058 if (!HCD_DEAD(hcd)) {
2059 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2060 hcd->state = old_state;
2061 }
2062 spin_unlock_irq(&hcd_root_hub_lock);
686314cf 2063 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
9293677a 2064 "suspend", status);
686314cf 2065 }
9293677a 2066 return status;
1da177e4
LT		 2067}
2068
65bfd296 2069int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
1da177e4 2070{
686314cf
AS		 2071 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
2072 int status;
cfa59dab 2073 int old_state = hcd->state;
1da177e4 2074
30b1a7a3
AS		 2075 dev_dbg(&rhdev->dev, "usb %sresume\n",
2076 (PMSG_IS_AUTO(msg) ? "auto-" : ""));
9b37596a
AS		 2077 if (HCD_DEAD(hcd)) {
2078 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
2079 return 0;
2080 }
0c0382e3 2081 if (!hcd->driver->bus_resume)
9293677a 2082 return -ENOENT;
9b37596a 2083 if (HCD_RH_RUNNING(hcd))
979d5199 2084 return 0;
686314cf 2085
9293677a 2086 hcd->state = HC_STATE_RESUMING;
686314cf 2087 status = hcd->driver->bus_resume(hcd);
bf3d7d40 2088 clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
686314cf 2089 if (status == 0) {
bfd1e910
AS		 2090 struct usb_device *udev;
2091 int port1;
2092
9b37596a
AS		 2093 spin_lock_irq(&hcd_root_hub_lock);
2094 if (!HCD_DEAD(hcd)) {
2095 usb_set_device_state(rhdev, rhdev->actconfig
2096 ? USB_STATE_CONFIGURED
2097 : USB_STATE_ADDRESS);
2098 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2099 hcd->state = HC_STATE_RUNNING;
2100 }
2101 spin_unlock_irq(&hcd_root_hub_lock);
bfd1e910
AS		 2102
2103 /*
2104 * Check whether any of the enabled ports on the root hub are
2105 * unsuspended. If they are then a TRSMRCY delay is needed
2106 * (this is what the USB-2 spec calls a "global resume").
2107 * Otherwise we can skip the delay.
2108 */
2109 usb_hub_for_each_child(rhdev, port1, udev) {
2110 if (udev->state != USB_STATE_NOTATTACHED &&
2111 !udev->port_is_suspended) {
2112 usleep_range(10000, 11000); /* TRSMRCY */
2113 break;
2114 }
2115 }
686314cf 2116 } else {
cfa59dab 2117 hcd->state = old_state;
686314cf 2118 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
9293677a 2119 "resume", status);
cfa59dab
AS		 2120 if (status != -ESHUTDOWN)
2121 usb_hc_died(hcd);
9293677a
DB		 2122 }
2123 return status;
1da177e4
LT		 2124}
2125
9bbdf1e0
AS		 2126#endif /* CONFIG_PM */
2127
2128#ifdef CONFIG_USB_SUSPEND
2129
6b157c9b
AS		 2130/* Workqueue routine for root-hub remote wakeup */
2131static void hcd_resume_work(struct work_struct *work)
2132{
2133 struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
2134 struct usb_device *udev = hcd->self.root_hub;
2135
2136 usb_lock_device(udev);
0534d468 2137 usb_remote_wakeup(udev);
6b157c9b
AS		 2138 usb_unlock_device(udev);
2139}
2140
1da177e4
LT		 2141/**
2142 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
2143 * @hcd: host controller for this root hub
2144 *
2145 * The USB host controller calls this function when its root hub is
2146 * suspended (with the remote wakeup feature enabled) and a remote
6b157c9b
AS		 2147 * wakeup request is received. The routine submits a workqueue request
2148 * to resume the root hub (that is, manage its downstream ports again).
1da177e4
LT		 2149 */
2150void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2151{
2152 unsigned long flags;
2153
2154 spin_lock_irqsave (&hcd_root_hub_lock, flags);
ff2f0787
AS		 2155 if (hcd->rh_registered) {
2156 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
9bbdf1e0 2157 queue_work(pm_wq, &hcd->wakeup_work);
ff2f0787 2158 }
1da177e4
LT		 2159 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2160}
9293677a 2161EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1da177e4 2162
9bbdf1e0 2163#endif /* CONFIG_USB_SUSPEND */
1da177e4
LT		 2164
2165/*-------------------------------------------------------------------------*/
2166
2167#ifdef CONFIG_USB_OTG
2168
2169/**
2170 * usb_bus_start_enum - start immediate enumeration (for OTG)
2171 * @bus: the bus (must use hcd framework)
2172 * @port_num: 1-based number of port; usually bus->otg_port
2173 * Context: in_interrupt()
2174 *
2175 * Starts enumeration, with an immediate reset followed later by
2176 * khubd identifying and possibly configuring the device.
2177 * This is needed by OTG controller drivers, where it helps meet
2178 * HNP protocol timing requirements for starting a port reset.
2179 */
2180int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2181{
2182 struct usb_hcd *hcd;
2183 int status = -EOPNOTSUPP;
2184
2185 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2186 * boards with root hubs hooked up to internal devices (instead of
2187 * just the OTG port) may need more attention to resetting...
2188 */
2189 hcd = container_of (bus, struct usb_hcd, self);
2190 if (port_num && hcd->driver->start_port_reset)
2191 status = hcd->driver->start_port_reset(hcd, port_num);
2192
2193 /* run khubd shortly after (first) root port reset finishes;
2194 * it may issue others, until at least 50 msecs have passed.
2195 */
2196 if (status == 0)
2197 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2198 return status;
2199}
782e70c6 2200EXPORT_SYMBOL_GPL(usb_bus_start_enum);
1da177e4
LT		 2201
2202#endif
2203
2204/*-------------------------------------------------------------------------*/
2205
1da177e4
LT		 2206/**
2207 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2208 * @irq: the IRQ being raised
2209 * @__hcd: pointer to the HCD whose IRQ is being signaled
1da177e4
LT		 2210 *
2211 * If the controller isn't HALTed, calls the driver's irq handler.
2212 * Checks whether the controller is now dead.
2213 */
7d12e780 2214irqreturn_t usb_hcd_irq (int irq, void *__hcd)
1da177e4
LT		 2215{
2216 struct usb_hcd *hcd = __hcd;
e592c5d0 2217 unsigned long flags;
de85422b 2218 irqreturn_t rc;
1da177e4 2219
e592c5d0
GKH		 2220 /* IRQF_DISABLED doesn't work correctly with shared IRQs
2221 * when the first handler doesn't use it. So let's just
2222 * assume it's never used.
2223 */
2224 local_irq_save(flags);
2225
968b822c 2226 if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
de85422b 2227 rc = IRQ_NONE;
968b822c 2228 else if (hcd->driver->irq(hcd) == IRQ_NONE)
de85422b 2229 rc = IRQ_NONE;
968b822c 2230 else
de85422b 2231 rc = IRQ_HANDLED;
de85422b 2232
e592c5d0 2233 local_irq_restore(flags);
de85422b 2234 return rc;
1da177e4 2235}
43b86af8 2236EXPORT_SYMBOL_GPL(usb_hcd_irq);
1da177e4
LT		 2237
2238/*-------------------------------------------------------------------------*/
2239
2240/**
2241 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2242 * @hcd: pointer to the HCD representing the controller
2243 *
2244 * This is called by bus glue to report a USB host controller that died
2245 * while operations may still have been pending. It's called automatically
c5635437
SS		 2246 * by the PCI glue, so only glue for non-PCI busses should need to call it.
2247 *
2248 * Only call this function with the primary HCD.
1da177e4
LT		 2249 */
2250void usb_hc_died (struct usb_hcd *hcd)
2251{
2252 unsigned long flags;
2253
2254 dev_err (hcd->self.controller, "HC died; cleaning up\n");
2255
2256 spin_lock_irqsave (&hcd_root_hub_lock, flags);
9b37596a
AS		 2257 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2258 set_bit(HCD_FLAG_DEAD, &hcd->flags);
1da177e4 2259 if (hcd->rh_registered) {
541c7d43 2260 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1da177e4
LT		 2261
2262 /* make khubd clean up old urbs and devices */
2263 usb_set_device_state (hcd->self.root_hub,
2264 USB_STATE_NOTATTACHED);
2265 usb_kick_khubd (hcd->self.root_hub);
2266 }
c5635437
SS		 2267 if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
2268 hcd = hcd->shared_hcd;
2269 if (hcd->rh_registered) {
2270 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2271
2272 /* make khubd clean up old urbs and devices */
2273 usb_set_device_state(hcd->self.root_hub,
2274 USB_STATE_NOTATTACHED);
2275 usb_kick_khubd(hcd->self.root_hub);
2276 }
2277 }
1da177e4 2278 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
c5635437 2279 /* Make sure that the other roothub is also deallocated. */
1da177e4
LT		 2280}
2281EXPORT_SYMBOL_GPL (usb_hc_died);
2282
2283/*-------------------------------------------------------------------------*/
2284
1da177e4 2285/**
c5635437 2286 * usb_create_shared_hcd - create and initialize an HCD structure
1da177e4
LT		 2287 * @driver: HC driver that will use this hcd
2288 * @dev: device for this HC, stored in hcd->self.controller
2289 * @bus_name: value to store in hcd->self.bus_name
c5635437
SS		 2290 * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
2291 * PCI device. Only allocate certain resources for the primary HCD
1da177e4
LT		 2292 * Context: !in_interrupt()
2293 *
2294 * Allocate a struct usb_hcd, with extra space at the end for the
2295 * HC driver's private data. Initialize the generic members of the
2296 * hcd structure.
2297 *
2298 * If memory is unavailable, returns NULL.
2299 */
c5635437
SS		 2300struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
2301 struct device *dev, const char *bus_name,
2302 struct usb_hcd *primary_hcd)
1da177e4
LT		 2303{
2304 struct usb_hcd *hcd;
2305
7b842b6e 2306 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1da177e4
LT		 2307 if (!hcd) {
2308 dev_dbg (dev, "hcd alloc failed\n");
2309 return NULL;
2310 }
c5635437
SS		 2311 if (primary_hcd == NULL) {
2312 hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
2313 GFP_KERNEL);
2314 if (!hcd->bandwidth_mutex) {
2315 kfree(hcd);
2316 dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
2317 return NULL;
2318 }
2319 mutex_init(hcd->bandwidth_mutex);
2320 dev_set_drvdata(dev, hcd);
2321 } else {
2322 hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
2323 hcd->primary_hcd = primary_hcd;
2324 primary_hcd->primary_hcd = primary_hcd;
2325 hcd->shared_hcd = primary_hcd;
2326 primary_hcd->shared_hcd = hcd;
d673bfcb 2327 }
d673bfcb 2328
17200583 2329 kref_init(&hcd->kref);
1da177e4
LT		 2330
2331 usb_bus_init(&hcd->self);
1da177e4
LT		 2332 hcd->self.controller = dev;
2333 hcd->self.bus_name = bus_name;
dd990f16 2334 hcd->self.uses_dma = (dev->dma_mask != NULL);
1da177e4
LT		 2335
2336 init_timer(&hcd->rh_timer);
d5926ae7
AS		 2337 hcd->rh_timer.function = rh_timer_func;
2338 hcd->rh_timer.data = (unsigned long) hcd;
9bbdf1e0 2339#ifdef CONFIG_USB_SUSPEND
6b157c9b
AS		 2340 INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2341#endif
1da177e4
LT		 2342
2343 hcd->driver = driver;
83de4b2b 2344 hcd->speed = driver->flags & HCD_MASK;
1da177e4
LT		 2345 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2346 "USB Host Controller";
1da177e4
LT		 2347 return hcd;
2348}
c5635437
SS		 2349EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
2350
2351/**
2352 * usb_create_hcd - create and initialize an HCD structure
2353 * @driver: HC driver that will use this hcd
2354 * @dev: device for this HC, stored in hcd->self.controller
2355 * @bus_name: value to store in hcd->self.bus_name
2356 * Context: !in_interrupt()
2357 *
2358 * Allocate a struct usb_hcd, with extra space at the end for the
2359 * HC driver's private data. Initialize the generic members of the
2360 * hcd structure.
2361 *
2362 * If memory is unavailable, returns NULL.
2363 */
2364struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
2365 struct device *dev, const char *bus_name)
2366{
2367 return usb_create_shared_hcd(driver, dev, bus_name, NULL);
2368}
782e70c6 2369EXPORT_SYMBOL_GPL(usb_create_hcd);
1da177e4 2370
c5635437
SS		 2371/*
2372 * Roothubs that share one PCI device must also share the bandwidth mutex.
2373 * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
2374 * deallocated.
2375 *
2376 * Make sure to only deallocate the bandwidth_mutex when the primary HCD is
2377 * freed. When hcd_release() is called for the non-primary HCD, set the
2378 * primary_hcd's shared_hcd pointer to null (since the non-primary HCD will be
2379 * freed shortly).
2380 */
17200583
AS		 2381static void hcd_release (struct kref *kref)
2382{
2383 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2384
c5635437
SS		 2385 if (usb_hcd_is_primary_hcd(hcd))
2386 kfree(hcd->bandwidth_mutex);
2387 else
2388 hcd->shared_hcd->shared_hcd = NULL;
17200583
AS		 2389 kfree(hcd);
2390}
2391
2392struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2393{
2394 if (hcd)
2395 kref_get (&hcd->kref);
2396 return hcd;
2397}
782e70c6 2398EXPORT_SYMBOL_GPL(usb_get_hcd);
17200583 2399
1da177e4
LT		 2400void usb_put_hcd (struct usb_hcd *hcd)
2401{
17200583
AS		 2402 if (hcd)
2403 kref_put (&hcd->kref, hcd_release);
1da177e4 2404}
782e70c6 2405EXPORT_SYMBOL_GPL(usb_put_hcd);
1da177e4 2406
c5635437
SS		 2407int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
2408{
2409 if (!hcd->primary_hcd)
2410 return 1;
2411 return hcd == hcd->primary_hcd;
2412}
2413EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
2414
23e0d106
SS		 2415static int usb_hcd_request_irqs(struct usb_hcd *hcd,
2416 unsigned int irqnum, unsigned long irqflags)
2417{
2418 int retval;
2419
2420 if (hcd->driver->irq) {
e592c5d0
GKH		 2421
2422 /* IRQF_DISABLED doesn't work as advertised when used together
2423 * with IRQF_SHARED. As usb_hcd_irq() will always disable
2424 * interrupts we can remove it here.
2425 */
2426 if (irqflags & IRQF_SHARED)
2427 irqflags &= ~IRQF_DISABLED;
2428
23e0d106
SS		 2429 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2430 hcd->driver->description, hcd->self.busnum);
2431 retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2432 hcd->irq_descr, hcd);
2433 if (retval != 0) {
2434 dev_err(hcd->self.controller,
2435 "request interrupt %d failed\n",
2436 irqnum);
2437 return retval;
2438 }
2439 hcd->irq = irqnum;
2440 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2441 (hcd->driver->flags & HCD_MEMORY) ?
2442 "io mem" : "io base",
2443 (unsigned long long)hcd->rsrc_start);
2444 } else {
cd70469d 2445 hcd->irq = 0;
23e0d106
SS		 2446 if (hcd->rsrc_start)
2447 dev_info(hcd->self.controller, "%s 0x%08llx\n",
2448 (hcd->driver->flags & HCD_MEMORY) ?
2449 "io mem" : "io base",
2450 (unsigned long long)hcd->rsrc_start);
2451 }
2452 return 0;
2453}
2454
1da177e4
LT		 2455/**
2456 * usb_add_hcd - finish generic HCD structure initialization and register
2457 * @hcd: the usb_hcd structure to initialize
2458 * @irqnum: Interrupt line to allocate
2459 * @irqflags: Interrupt type flags
2460 *
2461 * Finish the remaining parts of generic HCD initialization: allocate the
2462 * buffers of consistent memory, register the bus, request the IRQ line,
2463 * and call the driver's reset() and start() routines.
2464 */
2465int usb_add_hcd(struct usb_hcd *hcd,
2466 unsigned int irqnum, unsigned long irqflags)
2467{
8ec8d20b
AS		 2468 int retval;
2469 struct usb_device *rhdev;
1da177e4
LT		 2470
2471 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2472
c4fc2342
CDH		 2473 /* Keep old behaviour if authorized_default is not in [0, 1]. */
2474 if (authorized_default < 0 || authorized_default > 1)
2475 hcd->authorized_default = hcd->wireless? 0 : 1;
2476 else
2477 hcd->authorized_default = authorized_default;
8de98402
BH		 2478 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2479
b1e8f0a6
DB		 2480 /* HC is in reset state, but accessible. Now do the one-time init,
2481 * bottom up so that hcds can customize the root hubs before khubd
2482 * starts talking to them. (Note, bus id is assigned early too.)
2483 */
1da177e4
LT		 2484 if ((retval = hcd_buffer_create(hcd)) != 0) {
2485 dev_dbg(hcd->self.controller, "pool alloc failed\n");
2486 return retval;
2487 }
2488
2489 if ((retval = usb_register_bus(&hcd->self)) < 0)
8ec8d20b 2490 goto err_register_bus;
1da177e4 2491
b1e8f0a6
DB		 2492 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
2493 dev_err(hcd->self.controller, "unable to allocate root hub\n");
2494 retval = -ENOMEM;
2495 goto err_allocate_root_hub;
2496 }
6d88e679 2497 hcd->self.root_hub = rhdev;
6b403b02 2498
83de4b2b 2499 switch (hcd->speed) {
6b403b02
SS		 2500 case HCD_USB11:
2501 rhdev->speed = USB_SPEED_FULL;
2502 break;
2503 case HCD_USB2:
2504 rhdev->speed = USB_SPEED_HIGH;
2505 break;
2506 case HCD_USB3:
2507 rhdev->speed = USB_SPEED_SUPER;
2508 break;
2509 default:
1d15ee4c 2510 retval = -EINVAL;
96e077ae 2511 goto err_set_rh_speed;
6b403b02 2512 }
b1e8f0a6 2513
db4cefaa
DB		 2514 /* wakeup flag init defaults to "everything works" for root hubs,
2515 * but drivers can override it in reset() if needed, along with
2516 * recording the overall controller's system wakeup capability.
2517 */
a6eeeb9f 2518 device_set_wakeup_capable(&rhdev->dev, 1);
db4cefaa 2519
9b37596a
AS		 2520 /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
2521 * registered. But since the controller can die at any time,
2522 * let's initialize the flag before touching the hardware.
2523 */
2524 set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2525
b1e8f0a6
DB		 2526 /* "reset" is misnamed; its role is now one-time init. the controller
2527 * should already have been reset (and boot firmware kicked off etc).
2528 */
2529 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
2530 dev_err(hcd->self.controller, "can't setup\n");
2531 goto err_hcd_driver_setup;
2532 }
6d88e679 2533 hcd->rh_pollable = 1;
b1e8f0a6 2534
fb669cc0
DB		 2535 /* NOTE: root hub and controller capabilities may not be the same */
2536 if (device_can_wakeup(hcd->self.controller)
2537 && device_can_wakeup(&hcd->self.root_hub->dev))
b1e8f0a6 2538 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
b1e8f0a6 2539
68d07f64
SS		 2540 /* enable irqs just before we start the controller,
2541 * if the BIOS provides legacy PCI irqs.
2542 */
2543 if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
c5635437
SS		 2544 retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
2545 if (retval)
2546 goto err_request_irq;
2547 }
1da177e4 2548
4814030c 2549 hcd->state = HC_STATE_RUNNING;
abc4f9b0
SS		 2550 retval = hcd->driver->start(hcd);
2551 if (retval < 0) {
1da177e4 2552 dev_err(hcd->self.controller, "startup error %d\n", retval);
8ec8d20b 2553 goto err_hcd_driver_start;
1da177e4
LT		 2554 }
2555
b1e8f0a6 2556 /* starting here, usbcore will pay attention to this root hub */
b1e8f0a6 2557 if ((retval = register_root_hub(hcd)) != 0)
8ec8d20b
AS		 2558 goto err_register_root_hub;
2559
5234ce1b
IPG		 2560 retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2561 if (retval < 0) {
2562 printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
2563 retval);
2564 goto error_create_attr_group;
2565 }
541c7d43 2566 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
d5926ae7 2567 usb_hcd_poll_rh_status(hcd);
a6eeeb9f
AS		 2568
2569 /*
2570 * Host controllers don't generate their own wakeup requests;
2571 * they only forward requests from the root hub. Therefore
2572 * controllers should always be enabled for remote wakeup.
2573 */
2574 device_wakeup_enable(hcd->self.controller);
1da177e4
LT		 2575 return retval;
2576
5234ce1b 2577error_create_attr_group:
9b37596a 2578 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
96e077ae
AS		 2579 if (HC_IS_RUNNING(hcd->state))
2580 hcd->state = HC_STATE_QUIESCING;
2581 spin_lock_irq(&hcd_root_hub_lock);
2582 hcd->rh_registered = 0;
2583 spin_unlock_irq(&hcd_root_hub_lock);
2584
2585#ifdef CONFIG_USB_SUSPEND
2586 cancel_work_sync(&hcd->wakeup_work);
2587#endif
5234ce1b 2588 mutex_lock(&usb_bus_list_lock);
6d88e679 2589 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
5234ce1b 2590 mutex_unlock(&usb_bus_list_lock);
b1e8f0a6 2591err_register_root_hub:
6d88e679 2592 hcd->rh_pollable = 0;
541c7d43 2593 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
6d88e679 2594 del_timer_sync(&hcd->rh_timer);
8ec8d20b 2595 hcd->driver->stop(hcd);
96e077ae 2596 hcd->state = HC_STATE_HALT;
541c7d43 2597 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
96e077ae 2598 del_timer_sync(&hcd->rh_timer);
b1e8f0a6 2599err_hcd_driver_start:
cd70469d 2600 if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
1da177e4 2601 free_irq(irqnum, hcd);
b1e8f0a6
DB		 2602err_request_irq:
2603err_hcd_driver_setup:
96e077ae 2604err_set_rh_speed:
6d88e679 2605 usb_put_dev(hcd->self.root_hub);
b1e8f0a6 2606err_allocate_root_hub:
1da177e4 2607 usb_deregister_bus(&hcd->self);
b1e8f0a6 2608err_register_bus:
1da177e4
LT		 2609 hcd_buffer_destroy(hcd);
2610 return retval;
2611}
782e70c6 2612EXPORT_SYMBOL_GPL(usb_add_hcd);
1da177e4
LT		 2613
2614/**
2615 * usb_remove_hcd - shutdown processing for generic HCDs
2616 * @hcd: the usb_hcd structure to remove
2617 * Context: !in_interrupt()
2618 *
2619 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
2620 * invoking the HCD's stop() method.
2621 */
2622void usb_remove_hcd(struct usb_hcd *hcd)
2623{
6d88e679
AS		 2624 struct usb_device *rhdev = hcd->self.root_hub;
2625
1da177e4
LT		 2626 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
2627
6d88e679
AS		 2628 usb_get_dev(rhdev);
2629 sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
96e077ae 2630
9b37596a 2631 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
1da177e4
LT		 2632 if (HC_IS_RUNNING (hcd->state))
2633 hcd->state = HC_STATE_QUIESCING;
2634
2635 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
2636 spin_lock_irq (&hcd_root_hub_lock);
2637 hcd->rh_registered = 0;
2638 spin_unlock_irq (&hcd_root_hub_lock);
9ad3d6cc 2639
9bbdf1e0 2640#ifdef CONFIG_USB_SUSPEND
d5d4db70 2641 cancel_work_sync(&hcd->wakeup_work);
6b157c9b
AS		 2642#endif
2643
4186ecf8 2644 mutex_lock(&usb_bus_list_lock);
6d88e679 2645 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
4186ecf8 2646 mutex_unlock(&usb_bus_list_lock);
1da177e4 2647
6d88e679
AS		 2648 /* Prevent any more root-hub status calls from the timer.
2649 * The HCD might still restart the timer (if a port status change
2650 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
2651 * the hub_status_data() callback.
2652 */
2653 hcd->rh_pollable = 0;
541c7d43 2654 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
6d88e679
AS		 2655 del_timer_sync(&hcd->rh_timer);
2656
1da177e4
LT		 2657 hcd->driver->stop(hcd);
2658 hcd->state = HC_STATE_HALT;
2659
6d88e679 2660 /* In case the HCD restarted the timer, stop it again. */
541c7d43 2661 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1b42ae6d
AS		 2662 del_timer_sync(&hcd->rh_timer);
2663
c5635437 2664 if (usb_hcd_is_primary_hcd(hcd)) {
cd70469d 2665 if (hcd->irq > 0)
c5635437
SS		 2666 free_irq(hcd->irq, hcd);
2667 }
6d88e679
AS		 2668
2669 usb_put_dev(hcd->self.root_hub);
1da177e4
LT		 2670 usb_deregister_bus(&hcd->self);
2671 hcd_buffer_destroy(hcd);
2672}
782e70c6 2673EXPORT_SYMBOL_GPL(usb_remove_hcd);
1da177e4 2674
64a21d02
AG		 2675void
2676usb_hcd_platform_shutdown(struct platform_device* dev)
2677{
2678 struct usb_hcd *hcd = platform_get_drvdata(dev);
2679
2680 if (hcd->driver->shutdown)
2681 hcd->driver->shutdown(hcd);
2682}
782e70c6 2683EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
64a21d02 2684
1da177e4
LT		 2685/*-------------------------------------------------------------------------*/
2686
f150fa1a 2687#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
1da177e4
LT		 2688
2689struct usb_mon_operations *mon_ops;
2690
2691/*
2692 * The registration is unlocked.
2693 * We do it this way because we do not want to lock in hot paths.
2694 *
2695 * Notice that the code is minimally error-proof. Because usbmon needs
2696 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
2697 */
2698
2699int usb_mon_register (struct usb_mon_operations *ops)
2700{
2701
2702 if (mon_ops)
2703 return -EBUSY;
2704
2705 mon_ops = ops;
2706 mb();
2707 return 0;
2708}
2709EXPORT_SYMBOL_GPL (usb_mon_register);
2710
2711void usb_mon_deregister (void)
2712{
2713
2714 if (mon_ops == NULL) {
2715 printk(KERN_ERR "USB: monitor was not registered\n");
2716 return;
2717 }
2718 mon_ops = NULL;
2719 mb();
2720}
2721EXPORT_SYMBOL_GPL (usb_mon_deregister);
2722
f150fa1a 2723#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
Linux kernel - Deliverables
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