Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * devices.c | |
3 | * (C) Copyright 1999 Randy Dunlap. | |
4 | * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. (proc file per device) | |
5 | * (C) Copyright 1999 Deti Fliegl (new USB architecture) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | ************************************************************* | |
22 | * | |
23 | * <mountpoint>/devices contains USB topology, device, config, class, | |
24 | * interface, & endpoint data. | |
25 | * | |
26 | * I considered using /proc/bus/usb/devices/device# for each device | |
27 | * as it is attached or detached, but I didn't like this for some | |
28 | * reason -- maybe it's just too deep of a directory structure. | |
29 | * I also don't like looking in multiple places to gather and view | |
30 | * the data. Having only one file for ./devices also prevents race | |
31 | * conditions that could arise if a program was reading device info | |
32 | * for devices that are being removed (unplugged). (That is, the | |
33 | * program may find a directory for devnum_12 then try to open it, | |
34 | * but it was just unplugged, so the directory is now deleted. | |
35 | * But programs would just have to be prepared for situations like | |
36 | * this in any plug-and-play environment.) | |
37 | * | |
38 | * 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch> | |
39 | * Converted the whole proc stuff to real | |
40 | * read methods. Now not the whole device list needs to fit | |
41 | * into one page, only the device list for one bus. | |
42 | * Added a poll method to /proc/bus/usb/devices, to wake | |
43 | * up an eventual usbd | |
44 | * 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch> | |
45 | * Turned into its own filesystem | |
46 | * 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk> | |
47 | * Converted file reading routine to dump to buffer once | |
48 | * per device, not per bus | |
49 | * | |
50 | * $Id: devices.c,v 1.5 2000/01/11 13:58:21 tom Exp $ | |
51 | */ | |
52 | ||
53 | #include <linux/fs.h> | |
54 | #include <linux/mm.h> | |
55 | #include <linux/slab.h> | |
56 | #include <linux/poll.h> | |
57 | #include <linux/usb.h> | |
58 | #include <linux/smp_lock.h> | |
59 | #include <linux/usbdevice_fs.h> | |
4186ecf8 | 60 | #include <linux/mutex.h> |
1da177e4 LT |
61 | #include <asm/uaccess.h> |
62 | ||
6d5e8254 | 63 | #include "usb.h" |
1da177e4 LT |
64 | #include "hcd.h" |
65 | ||
66 | #define MAX_TOPO_LEVEL 6 | |
67 | ||
68 | /* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */ | |
69 | #define ALLOW_SERIAL_NUMBER | |
70 | ||
4c4c9432 | 71 | static const char *format_topo = |
1da177e4 LT |
72 | /* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=ddd MxCh=dd */ |
73 | "\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%3s MxCh=%2d\n"; | |
74 | ||
4c4c9432 | 75 | static const char *format_string_manufacturer = |
1da177e4 LT |
76 | /* S: Manufacturer=xxxx */ |
77 | "S: Manufacturer=%.100s\n"; | |
78 | ||
4c4c9432 | 79 | static const char *format_string_product = |
1da177e4 LT |
80 | /* S: Product=xxxx */ |
81 | "S: Product=%.100s\n"; | |
82 | ||
83 | #ifdef ALLOW_SERIAL_NUMBER | |
4c4c9432 | 84 | static const char *format_string_serialnumber = |
1da177e4 LT |
85 | /* S: SerialNumber=xxxx */ |
86 | "S: SerialNumber=%.100s\n"; | |
87 | #endif | |
88 | ||
4c4c9432 | 89 | static const char *format_bandwidth = |
1da177e4 LT |
90 | /* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */ |
91 | "B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n"; | |
92 | ||
4c4c9432 | 93 | static const char *format_device1 = |
1da177e4 LT |
94 | /* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */ |
95 | "D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n"; | |
96 | ||
4c4c9432 | 97 | static const char *format_device2 = |
1da177e4 LT |
98 | /* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */ |
99 | "P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n"; | |
100 | ||
4c4c9432 | 101 | static const char *format_config = |
1da177e4 LT |
102 | /* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */ |
103 | "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n"; | |
104 | ||
4c4c9432 | 105 | static const char *format_iface = |
1da177e4 | 106 | /* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/ |
2360e4aa | 107 | "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n"; |
1da177e4 | 108 | |
4c4c9432 | 109 | static const char *format_endpt = |
1da177e4 LT |
110 | /* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */ |
111 | "E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n"; | |
112 | ||
113 | ||
114 | /* | |
115 | * Need access to the driver and USB bus lists. | |
116 | * extern struct list_head usb_bus_list; | |
117 | * However, these will come from functions that return ptrs to each of them. | |
118 | */ | |
119 | ||
120 | static DECLARE_WAIT_QUEUE_HEAD(deviceconndiscwq); | |
121 | static unsigned int conndiscevcnt = 0; | |
122 | ||
123 | /* this struct stores the poll state for <mountpoint>/devices pollers */ | |
124 | struct usb_device_status { | |
125 | unsigned int lastev; | |
126 | }; | |
127 | ||
128 | struct class_info { | |
129 | int class; | |
130 | char *class_name; | |
131 | }; | |
132 | ||
133 | static const struct class_info clas_info[] = | |
134 | { /* max. 5 chars. per name string */ | |
135 | {USB_CLASS_PER_INTERFACE, ">ifc"}, | |
136 | {USB_CLASS_AUDIO, "audio"}, | |
137 | {USB_CLASS_COMM, "comm."}, | |
138 | {USB_CLASS_HID, "HID"}, | |
139 | {USB_CLASS_HUB, "hub"}, | |
140 | {USB_CLASS_PHYSICAL, "PID"}, | |
141 | {USB_CLASS_PRINTER, "print"}, | |
142 | {USB_CLASS_MASS_STORAGE, "stor."}, | |
143 | {USB_CLASS_CDC_DATA, "data"}, | |
144 | {USB_CLASS_APP_SPEC, "app."}, | |
145 | {USB_CLASS_VENDOR_SPEC, "vend."}, | |
146 | {USB_CLASS_STILL_IMAGE, "still"}, | |
147 | {USB_CLASS_CSCID, "scard"}, | |
148 | {USB_CLASS_CONTENT_SEC, "c-sec"}, | |
149 | {-1, "unk."} /* leave as last */ | |
150 | }; | |
151 | ||
152 | /*****************************************************************/ | |
153 | ||
154 | void usbfs_conn_disc_event(void) | |
155 | { | |
156 | conndiscevcnt++; | |
157 | wake_up(&deviceconndiscwq); | |
158 | } | |
159 | ||
160 | static const char *class_decode(const int class) | |
161 | { | |
162 | int ix; | |
163 | ||
164 | for (ix = 0; clas_info[ix].class != -1; ix++) | |
165 | if (clas_info[ix].class == class) | |
166 | break; | |
1a68f71d | 167 | return clas_info[ix].class_name; |
1da177e4 LT |
168 | } |
169 | ||
1a68f71d | 170 | static char *usb_dump_endpoint_descriptor( |
1da177e4 LT |
171 | int speed, |
172 | char *start, | |
173 | char *end, | |
174 | const struct usb_endpoint_descriptor *desc | |
175 | ) | |
176 | { | |
177 | char dir, unit, *type; | |
87ad46c9 | 178 | unsigned interval, bandwidth = 1; |
1da177e4 LT |
179 | |
180 | if (start > end) | |
181 | return start; | |
87ad46c9 LFC |
182 | |
183 | dir = usb_endpoint_dir_in(desc) ? 'I' : 'O'; | |
184 | ||
1da177e4 LT |
185 | if (speed == USB_SPEED_HIGH) { |
186 | switch (le16_to_cpu(desc->wMaxPacketSize) & (0x03 << 11)) { | |
187 | case 1 << 11: bandwidth = 2; break; | |
188 | case 2 << 11: bandwidth = 3; break; | |
189 | } | |
190 | } | |
191 | ||
192 | /* this isn't checking for illegal values */ | |
193 | switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { | |
194 | case USB_ENDPOINT_XFER_CONTROL: | |
195 | type = "Ctrl"; | |
196 | if (speed == USB_SPEED_HIGH) /* uframes per NAK */ | |
197 | interval = desc->bInterval; | |
198 | else | |
199 | interval = 0; | |
200 | dir = 'B'; /* ctrl is bidirectional */ | |
201 | break; | |
202 | case USB_ENDPOINT_XFER_ISOC: | |
203 | type = "Isoc"; | |
204 | interval = 1 << (desc->bInterval - 1); | |
205 | break; | |
206 | case USB_ENDPOINT_XFER_BULK: | |
207 | type = "Bulk"; | |
87ad46c9 | 208 | if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */ |
1da177e4 LT |
209 | interval = desc->bInterval; |
210 | else | |
211 | interval = 0; | |
212 | break; | |
213 | case USB_ENDPOINT_XFER_INT: | |
214 | type = "Int."; | |
1a68f71d | 215 | if (speed == USB_SPEED_HIGH) |
1da177e4 | 216 | interval = 1 << (desc->bInterval - 1); |
1a68f71d | 217 | else |
1da177e4 LT |
218 | interval = desc->bInterval; |
219 | break; | |
220 | default: /* "can't happen" */ | |
221 | return start; | |
222 | } | |
223 | interval *= (speed == USB_SPEED_HIGH) ? 125 : 1000; | |
224 | if (interval % 1000) | |
225 | unit = 'u'; | |
226 | else { | |
227 | unit = 'm'; | |
228 | interval /= 1000; | |
229 | } | |
230 | ||
231 | start += sprintf(start, format_endpt, desc->bEndpointAddress, dir, | |
232 | desc->bmAttributes, type, | |
233 | (le16_to_cpu(desc->wMaxPacketSize) & 0x07ff) * bandwidth, | |
234 | interval, unit); | |
235 | return start; | |
236 | } | |
237 | ||
238 | static char *usb_dump_interface_descriptor(char *start, char *end, | |
239 | const struct usb_interface_cache *intfc, | |
240 | const struct usb_interface *iface, | |
241 | int setno) | |
242 | { | |
243 | const struct usb_interface_descriptor *desc = &intfc->altsetting[setno].desc; | |
8d790d74 | 244 | const char *driver_name = ""; |
2360e4aa | 245 | int active = 0; |
1da177e4 LT |
246 | |
247 | if (start > end) | |
248 | return start; | |
249 | down_read(&usb_bus_type.subsys.rwsem); | |
2360e4aa | 250 | if (iface) { |
1da177e4 LT |
251 | driver_name = (iface->dev.driver |
252 | ? iface->dev.driver->name | |
253 | : "(none)"); | |
2360e4aa DB |
254 | active = (desc == &iface->cur_altsetting->desc); |
255 | } | |
1da177e4 | 256 | start += sprintf(start, format_iface, |
2360e4aa | 257 | active ? '*' : ' ', /* mark active altsetting */ |
1da177e4 LT |
258 | desc->bInterfaceNumber, |
259 | desc->bAlternateSetting, | |
260 | desc->bNumEndpoints, | |
261 | desc->bInterfaceClass, | |
262 | class_decode(desc->bInterfaceClass), | |
263 | desc->bInterfaceSubClass, | |
264 | desc->bInterfaceProtocol, | |
265 | driver_name); | |
266 | up_read(&usb_bus_type.subsys.rwsem); | |
267 | return start; | |
268 | } | |
269 | ||
270 | static char *usb_dump_interface( | |
271 | int speed, | |
272 | char *start, | |
273 | char *end, | |
274 | const struct usb_interface_cache *intfc, | |
275 | const struct usb_interface *iface, | |
276 | int setno | |
277 | ) { | |
278 | const struct usb_host_interface *desc = &intfc->altsetting[setno]; | |
279 | int i; | |
280 | ||
281 | start = usb_dump_interface_descriptor(start, end, intfc, iface, setno); | |
282 | for (i = 0; i < desc->desc.bNumEndpoints; i++) { | |
283 | if (start > end) | |
284 | return start; | |
285 | start = usb_dump_endpoint_descriptor(speed, | |
286 | start, end, &desc->endpoint[i].desc); | |
287 | } | |
288 | return start; | |
289 | } | |
290 | ||
291 | /* TBD: | |
292 | * 0. TBDs | |
293 | * 1. marking active interface altsettings (code lists all, but should mark | |
294 | * which ones are active, if any) | |
295 | */ | |
296 | ||
297 | static char *usb_dump_config_descriptor(char *start, char *end, const struct usb_config_descriptor *desc, int active) | |
298 | { | |
299 | if (start > end) | |
300 | return start; | |
301 | start += sprintf(start, format_config, | |
302 | active ? '*' : ' ', /* mark active/actual/current cfg. */ | |
303 | desc->bNumInterfaces, | |
304 | desc->bConfigurationValue, | |
305 | desc->bmAttributes, | |
306 | desc->bMaxPower * 2); | |
307 | return start; | |
308 | } | |
309 | ||
310 | static char *usb_dump_config ( | |
311 | int speed, | |
312 | char *start, | |
313 | char *end, | |
314 | const struct usb_host_config *config, | |
315 | int active | |
316 | ) | |
317 | { | |
318 | int i, j; | |
319 | struct usb_interface_cache *intfc; | |
320 | struct usb_interface *interface; | |
321 | ||
322 | if (start > end) | |
323 | return start; | |
324 | if (!config) /* getting these some in 2.3.7; none in 2.3.6 */ | |
325 | return start + sprintf(start, "(null Cfg. desc.)\n"); | |
326 | start = usb_dump_config_descriptor(start, end, &config->desc, active); | |
327 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
328 | intfc = config->intf_cache[i]; | |
329 | interface = config->interface[i]; | |
330 | for (j = 0; j < intfc->num_altsetting; j++) { | |
331 | if (start > end) | |
332 | return start; | |
333 | start = usb_dump_interface(speed, | |
334 | start, end, intfc, interface, j); | |
335 | } | |
336 | } | |
337 | return start; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Dump the different USB descriptors. | |
342 | */ | |
343 | static char *usb_dump_device_descriptor(char *start, char *end, const struct usb_device_descriptor *desc) | |
344 | { | |
345 | u16 bcdUSB = le16_to_cpu(desc->bcdUSB); | |
346 | u16 bcdDevice = le16_to_cpu(desc->bcdDevice); | |
347 | ||
348 | if (start > end) | |
349 | return start; | |
1a68f71d | 350 | start += sprintf(start, format_device1, |
1da177e4 LT |
351 | bcdUSB >> 8, bcdUSB & 0xff, |
352 | desc->bDeviceClass, | |
353 | class_decode (desc->bDeviceClass), | |
354 | desc->bDeviceSubClass, | |
355 | desc->bDeviceProtocol, | |
356 | desc->bMaxPacketSize0, | |
357 | desc->bNumConfigurations); | |
358 | if (start > end) | |
359 | return start; | |
360 | start += sprintf(start, format_device2, | |
361 | le16_to_cpu(desc->idVendor), | |
362 | le16_to_cpu(desc->idProduct), | |
363 | bcdDevice >> 8, bcdDevice & 0xff); | |
364 | return start; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Dump the different strings that this device holds. | |
369 | */ | |
1a68f71d | 370 | static char *usb_dump_device_strings(char *start, char *end, struct usb_device *dev) |
1da177e4 LT |
371 | { |
372 | if (start > end) | |
373 | return start; | |
374 | if (dev->manufacturer) | |
375 | start += sprintf(start, format_string_manufacturer, dev->manufacturer); | |
376 | if (start > end) | |
377 | goto out; | |
378 | if (dev->product) | |
379 | start += sprintf(start, format_string_product, dev->product); | |
380 | if (start > end) | |
381 | goto out; | |
382 | #ifdef ALLOW_SERIAL_NUMBER | |
383 | if (dev->serial) | |
384 | start += sprintf(start, format_string_serialnumber, dev->serial); | |
385 | #endif | |
386 | out: | |
387 | return start; | |
388 | } | |
389 | ||
390 | static char *usb_dump_desc(char *start, char *end, struct usb_device *dev) | |
391 | { | |
392 | int i; | |
393 | ||
394 | if (start > end) | |
395 | return start; | |
396 | ||
397 | start = usb_dump_device_descriptor(start, end, &dev->descriptor); | |
398 | ||
399 | if (start > end) | |
400 | return start; | |
401 | ||
1a68f71d | 402 | start = usb_dump_device_strings(start, end, dev); |
1da177e4 LT |
403 | |
404 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { | |
405 | if (start > end) | |
406 | return start; | |
407 | start = usb_dump_config(dev->speed, | |
408 | start, end, dev->config + i, | |
409 | /* active ? */ | |
410 | (dev->config + i) == dev->actconfig); | |
411 | } | |
412 | return start; | |
413 | } | |
414 | ||
415 | ||
416 | #ifdef PROC_EXTRA /* TBD: may want to add this code later */ | |
417 | ||
418 | static char *usb_dump_hub_descriptor(char *start, char *end, const struct usb_hub_descriptor * desc) | |
419 | { | |
420 | int leng = USB_DT_HUB_NONVAR_SIZE; | |
421 | unsigned char *ptr = (unsigned char *)desc; | |
422 | ||
423 | if (start > end) | |
424 | return start; | |
425 | start += sprintf(start, "Interface:"); | |
426 | while (leng && start <= end) { | |
427 | start += sprintf(start, " %02x", *ptr); | |
428 | ptr++; leng--; | |
429 | } | |
430 | *start++ = '\n'; | |
431 | return start; | |
432 | } | |
433 | ||
434 | static char *usb_dump_string(char *start, char *end, const struct usb_device *dev, char *id, int index) | |
435 | { | |
436 | if (start > end) | |
437 | return start; | |
438 | start += sprintf(start, "Interface:"); | |
439 | if (index <= dev->maxstring && dev->stringindex && dev->stringindex[index]) | |
440 | start += sprintf(start, "%s: %.100s ", id, dev->stringindex[index]); | |
441 | return start; | |
442 | } | |
443 | ||
444 | #endif /* PROC_EXTRA */ | |
445 | ||
446 | /*****************************************************************/ | |
447 | ||
448 | /* This is a recursive function. Parameters: | |
449 | * buffer - the user-space buffer to write data into | |
450 | * nbytes - the maximum number of bytes to write | |
451 | * skip_bytes - the number of bytes to skip before writing anything | |
452 | * file_offset - the offset into the devices file on completion | |
453 | * The caller must own the device lock. | |
454 | */ | |
455 | static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, loff_t *skip_bytes, loff_t *file_offset, | |
456 | struct usb_device *usbdev, struct usb_bus *bus, int level, int index, int count) | |
457 | { | |
458 | int chix; | |
459 | int ret, cnt = 0; | |
460 | int parent_devnum = 0; | |
461 | char *pages_start, *data_end, *speed; | |
462 | unsigned int length; | |
463 | ssize_t total_written = 0; | |
464 | ||
465 | /* don't bother with anything else if we're not writing any data */ | |
466 | if (*nbytes <= 0) | |
467 | return 0; | |
468 | ||
469 | if (level > MAX_TOPO_LEVEL) | |
470 | return 0; | |
471 | /* allocate 2^1 pages = 8K (on i386); should be more than enough for one device */ | |
472 | if (!(pages_start = (char*) __get_free_pages(GFP_KERNEL,1))) | |
473 | return -ENOMEM; | |
474 | ||
475 | if (usbdev->parent && usbdev->parent->devnum != -1) | |
476 | parent_devnum = usbdev->parent->devnum; | |
477 | /* | |
478 | * So the root hub's parent is 0 and any device that is | |
479 | * plugged into the root hub has a parent of 0. | |
480 | */ | |
481 | switch (usbdev->speed) { | |
482 | case USB_SPEED_LOW: | |
483 | speed = "1.5"; break; | |
484 | case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */ | |
485 | case USB_SPEED_FULL: | |
486 | speed = "12 "; break; | |
487 | case USB_SPEED_HIGH: | |
488 | speed = "480"; break; | |
489 | default: | |
490 | speed = "?? "; | |
491 | } | |
492 | data_end = pages_start + sprintf(pages_start, format_topo, | |
493 | bus->busnum, level, parent_devnum, | |
494 | index, count, usbdev->devnum, | |
495 | speed, usbdev->maxchild); | |
496 | /* | |
497 | * level = topology-tier level; | |
498 | * parent_devnum = parent device number; | |
499 | * index = parent's connector number; | |
500 | * count = device count at this level | |
501 | */ | |
502 | /* If this is the root hub, display the bandwidth information */ | |
503 | if (level == 0) { | |
504 | int max; | |
505 | ||
506 | /* high speed reserves 80%, full/low reserves 90% */ | |
507 | if (usbdev->speed == USB_SPEED_HIGH) | |
508 | max = 800; | |
509 | else | |
510 | max = FRAME_TIME_MAX_USECS_ALLOC; | |
511 | ||
512 | /* report "average" periodic allocation over a microsecond. | |
513 | * the schedules are actually bursty, HCDs need to deal with | |
514 | * that and just compute/report this average. | |
515 | */ | |
516 | data_end += sprintf(data_end, format_bandwidth, | |
517 | bus->bandwidth_allocated, max, | |
518 | (100 * bus->bandwidth_allocated + max / 2) | |
519 | / max, | |
520 | bus->bandwidth_int_reqs, | |
521 | bus->bandwidth_isoc_reqs); | |
522 | ||
523 | } | |
524 | data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256, usbdev); | |
525 | ||
526 | if (data_end > (pages_start + (2 * PAGE_SIZE) - 256)) | |
527 | data_end += sprintf(data_end, "(truncated)\n"); | |
528 | ||
529 | length = data_end - pages_start; | |
530 | /* if we can start copying some data to the user */ | |
531 | if (length > *skip_bytes) { | |
532 | length -= *skip_bytes; | |
533 | if (length > *nbytes) | |
534 | length = *nbytes; | |
535 | if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) { | |
536 | free_pages((unsigned long)pages_start, 1); | |
537 | return -EFAULT; | |
538 | } | |
539 | *nbytes -= length; | |
540 | *file_offset += length; | |
541 | total_written += length; | |
542 | *buffer += length; | |
543 | *skip_bytes = 0; | |
544 | } else | |
545 | *skip_bytes -= length; | |
546 | ||
547 | free_pages((unsigned long)pages_start, 1); | |
548 | ||
549 | /* Now look at all of this device's children. */ | |
550 | for (chix = 0; chix < usbdev->maxchild; chix++) { | |
551 | struct usb_device *childdev = usbdev->children[chix]; | |
552 | ||
553 | if (childdev) { | |
9ad3d6cc | 554 | usb_lock_device(childdev); |
1da177e4 LT |
555 | ret = usb_device_dump(buffer, nbytes, skip_bytes, file_offset, childdev, |
556 | bus, level + 1, chix, ++cnt); | |
9ad3d6cc | 557 | usb_unlock_device(childdev); |
1da177e4 LT |
558 | if (ret == -EFAULT) |
559 | return total_written; | |
560 | total_written += ret; | |
561 | } | |
562 | } | |
563 | return total_written; | |
564 | } | |
565 | ||
566 | static ssize_t usb_device_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) | |
567 | { | |
568 | struct usb_bus *bus; | |
569 | ssize_t ret, total_written = 0; | |
570 | loff_t skip_bytes = *ppos; | |
571 | ||
572 | if (*ppos < 0) | |
573 | return -EINVAL; | |
574 | if (nbytes <= 0) | |
575 | return 0; | |
576 | if (!access_ok(VERIFY_WRITE, buf, nbytes)) | |
577 | return -EFAULT; | |
578 | ||
4186ecf8 | 579 | mutex_lock(&usb_bus_list_lock); |
1da177e4 LT |
580 | /* print devices for all busses */ |
581 | list_for_each_entry(bus, &usb_bus_list, bus_list) { | |
582 | /* recurse through all children of the root hub */ | |
583 | if (!bus->root_hub) | |
584 | continue; | |
585 | usb_lock_device(bus->root_hub); | |
586 | ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos, bus->root_hub, bus, 0, 0, 0); | |
587 | usb_unlock_device(bus->root_hub); | |
588 | if (ret < 0) { | |
4186ecf8 | 589 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
590 | return ret; |
591 | } | |
592 | total_written += ret; | |
593 | } | |
4186ecf8 | 594 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
595 | return total_written; |
596 | } | |
597 | ||
598 | /* Kernel lock for "lastev" protection */ | |
599 | static unsigned int usb_device_poll(struct file *file, struct poll_table_struct *wait) | |
600 | { | |
ec17cf1c | 601 | struct usb_device_status *st = file->private_data; |
1da177e4 LT |
602 | unsigned int mask = 0; |
603 | ||
604 | lock_kernel(); | |
605 | if (!st) { | |
606 | st = kmalloc(sizeof(struct usb_device_status), GFP_KERNEL); | |
607 | if (!st) { | |
608 | unlock_kernel(); | |
609 | return POLLIN; | |
610 | } | |
ec17cf1c | 611 | |
1da177e4 LT |
612 | /* we may have dropped BKL - need to check for having lost the race */ |
613 | if (file->private_data) { | |
614 | kfree(st); | |
615 | st = file->private_data; | |
616 | goto lost_race; | |
617 | } | |
618 | ||
619 | /* | |
620 | * need to prevent the module from being unloaded, since | |
621 | * proc_unregister does not call the release method and | |
622 | * we would have a memory leak | |
623 | */ | |
624 | st->lastev = conndiscevcnt; | |
625 | file->private_data = st; | |
626 | mask = POLLIN; | |
627 | } | |
628 | lost_race: | |
629 | if (file->f_mode & FMODE_READ) | |
630 | poll_wait(file, &deviceconndiscwq, wait); | |
631 | if (st->lastev != conndiscevcnt) | |
632 | mask |= POLLIN; | |
633 | st->lastev = conndiscevcnt; | |
634 | unlock_kernel(); | |
635 | return mask; | |
636 | } | |
637 | ||
638 | static int usb_device_open(struct inode *inode, struct file *file) | |
639 | { | |
640 | file->private_data = NULL; | |
641 | return 0; | |
642 | } | |
643 | ||
644 | static int usb_device_release(struct inode *inode, struct file *file) | |
645 | { | |
1bc3c9e1 JJ |
646 | kfree(file->private_data); |
647 | file->private_data = NULL; | |
1da177e4 LT |
648 | return 0; |
649 | } | |
650 | ||
651 | static loff_t usb_device_lseek(struct file * file, loff_t offset, int orig) | |
652 | { | |
653 | loff_t ret; | |
654 | ||
655 | lock_kernel(); | |
656 | ||
657 | switch (orig) { | |
658 | case 0: | |
659 | file->f_pos = offset; | |
660 | ret = file->f_pos; | |
661 | break; | |
662 | case 1: | |
663 | file->f_pos += offset; | |
664 | ret = file->f_pos; | |
665 | break; | |
666 | case 2: | |
667 | default: | |
668 | ret = -EINVAL; | |
669 | } | |
670 | ||
671 | unlock_kernel(); | |
672 | return ret; | |
673 | } | |
674 | ||
066202dd | 675 | const struct file_operations usbfs_devices_fops = { |
1da177e4 LT |
676 | .llseek = usb_device_lseek, |
677 | .read = usb_device_read, | |
678 | .poll = usb_device_poll, | |
679 | .open = usb_device_open, | |
680 | .release = usb_device_release, | |
681 | }; |