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