Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * devices.c | |
3 | * (C) Copyright 1999 Randy Dunlap. | |
44526f91 CSA |
4 | * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. |
5 | * (proc file per device) | |
1da177e4 LT |
6 | * (C) Copyright 1999 Deti Fliegl (new USB architecture) |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | ************************************************************* | |
23 | * | |
24 | * <mountpoint>/devices contains USB topology, device, config, class, | |
25 | * interface, & endpoint data. | |
26 | * | |
27 | * I considered using /proc/bus/usb/devices/device# for each device | |
28 | * as it is attached or detached, but I didn't like this for some | |
29 | * reason -- maybe it's just too deep of a directory structure. | |
30 | * I also don't like looking in multiple places to gather and view | |
31 | * the data. Having only one file for ./devices also prevents race | |
32 | * conditions that could arise if a program was reading device info | |
33 | * for devices that are being removed (unplugged). (That is, the | |
34 | * program may find a directory for devnum_12 then try to open it, | |
35 | * but it was just unplugged, so the directory is now deleted. | |
36 | * But programs would just have to be prepared for situations like | |
37 | * this in any plug-and-play environment.) | |
38 | * | |
39 | * 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch> | |
40 | * Converted the whole proc stuff to real | |
41 | * read methods. Now not the whole device list needs to fit | |
42 | * into one page, only the device list for one bus. | |
43 | * Added a poll method to /proc/bus/usb/devices, to wake | |
44 | * up an eventual usbd | |
45 | * 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch> | |
46 | * Turned into its own filesystem | |
47 | * 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk> | |
48 | * Converted file reading routine to dump to buffer once | |
49 | * per device, not per bus | |
1da177e4 LT |
50 | */ |
51 | ||
52 | #include <linux/fs.h> | |
53 | #include <linux/mm.h> | |
5a0e3ad6 | 54 | #include <linux/gfp.h> |
1da177e4 LT |
55 | #include <linux/poll.h> |
56 | #include <linux/usb.h> | |
1da177e4 | 57 | #include <linux/usbdevice_fs.h> |
27729aad | 58 | #include <linux/usb/hcd.h> |
4186ecf8 | 59 | #include <linux/mutex.h> |
44526f91 | 60 | #include <linux/uaccess.h> |
1da177e4 | 61 | |
6d5e8254 | 62 | #include "usb.h" |
1da177e4 | 63 | |
1da177e4 LT |
64 | /* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */ |
65 | #define ALLOW_SERIAL_NUMBER | |
66 | ||
bce1a702 | 67 | static const char format_topo[] = |
834e2312 AS |
68 | /* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd */ |
69 | "\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%-4s MxCh=%2d\n"; | |
1da177e4 | 70 | |
bce1a702 | 71 | static const char format_string_manufacturer[] = |
1da177e4 LT |
72 | /* S: Manufacturer=xxxx */ |
73 | "S: Manufacturer=%.100s\n"; | |
74 | ||
bce1a702 | 75 | static const char format_string_product[] = |
1da177e4 LT |
76 | /* S: Product=xxxx */ |
77 | "S: Product=%.100s\n"; | |
78 | ||
79 | #ifdef ALLOW_SERIAL_NUMBER | |
bce1a702 | 80 | static const char format_string_serialnumber[] = |
1da177e4 LT |
81 | /* S: SerialNumber=xxxx */ |
82 | "S: SerialNumber=%.100s\n"; | |
83 | #endif | |
84 | ||
bce1a702 | 85 | static const char format_bandwidth[] = |
1da177e4 LT |
86 | /* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */ |
87 | "B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n"; | |
376c0d3f | 88 | |
bce1a702 | 89 | static const char format_device1[] = |
1da177e4 LT |
90 | /* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */ |
91 | "D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n"; | |
92 | ||
bce1a702 | 93 | static const char format_device2[] = |
1da177e4 LT |
94 | /* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */ |
95 | "P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n"; | |
96 | ||
bce1a702 | 97 | static const char format_config[] = |
1da177e4 LT |
98 | /* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */ |
99 | "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n"; | |
376c0d3f | 100 | |
bce1a702 | 101 | static const char format_iad[] = |
165fe97e CN |
102 | /* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */ |
103 | "A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n"; | |
104 | ||
bce1a702 | 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 | |
bce1a702 | 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 | ||
7bc80cd9 LT |
120 | /* |
121 | * Wait for an connect/disconnect event to happen. We initialize | |
122 | * the event counter with an odd number, and each event will increment | |
123 | * the event counter by two, so it will always _stay_ odd. That means | |
124 | * that it will never be zero, so "event 0" will never match a current | |
125 | * event, and thus 'poll' will always trigger as readable for the first | |
126 | * time it gets called. | |
127 | */ | |
128 | static struct device_connect_event { | |
129 | atomic_t count; | |
130 | wait_queue_head_t wait; | |
131 | } device_event = { | |
132 | .count = ATOMIC_INIT(1), | |
133 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait) | |
134 | }; | |
1da177e4 | 135 | |
1da177e4 LT |
136 | struct class_info { |
137 | int class; | |
138 | char *class_name; | |
139 | }; | |
140 | ||
44526f91 CSA |
141 | static const struct class_info clas_info[] = { |
142 | /* max. 5 chars. per name string */ | |
1da177e4 LT |
143 | {USB_CLASS_PER_INTERFACE, ">ifc"}, |
144 | {USB_CLASS_AUDIO, "audio"}, | |
145 | {USB_CLASS_COMM, "comm."}, | |
146 | {USB_CLASS_HID, "HID"}, | |
1da177e4 | 147 | {USB_CLASS_PHYSICAL, "PID"}, |
bf7fbb02 | 148 | {USB_CLASS_STILL_IMAGE, "still"}, |
1da177e4 LT |
149 | {USB_CLASS_PRINTER, "print"}, |
150 | {USB_CLASS_MASS_STORAGE, "stor."}, | |
bf7fbb02 | 151 | {USB_CLASS_HUB, "hub"}, |
1da177e4 | 152 | {USB_CLASS_CDC_DATA, "data"}, |
1da177e4 LT |
153 | {USB_CLASS_CSCID, "scard"}, |
154 | {USB_CLASS_CONTENT_SEC, "c-sec"}, | |
165fe97e | 155 | {USB_CLASS_VIDEO, "video"}, |
bf7fbb02 FP |
156 | {USB_CLASS_WIRELESS_CONTROLLER, "wlcon"}, |
157 | {USB_CLASS_MISC, "misc"}, | |
158 | {USB_CLASS_APP_SPEC, "app."}, | |
159 | {USB_CLASS_VENDOR_SPEC, "vend."}, | |
1da177e4 LT |
160 | {-1, "unk."} /* leave as last */ |
161 | }; | |
162 | ||
163 | /*****************************************************************/ | |
164 | ||
165 | void usbfs_conn_disc_event(void) | |
166 | { | |
7bc80cd9 LT |
167 | atomic_add(2, &device_event.count); |
168 | wake_up(&device_event.wait); | |
1da177e4 LT |
169 | } |
170 | ||
171 | static const char *class_decode(const int class) | |
172 | { | |
173 | int ix; | |
174 | ||
175 | for (ix = 0; clas_info[ix].class != -1; ix++) | |
176 | if (clas_info[ix].class == class) | |
177 | break; | |
1a68f71d | 178 | return clas_info[ix].class_name; |
1da177e4 LT |
179 | } |
180 | ||
376c0d3f GKH |
181 | static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end, |
182 | const struct usb_endpoint_descriptor *desc) | |
1da177e4 LT |
183 | { |
184 | char dir, unit, *type; | |
87ad46c9 | 185 | unsigned interval, bandwidth = 1; |
1da177e4 LT |
186 | |
187 | if (start > end) | |
188 | return start; | |
87ad46c9 LFC |
189 | |
190 | dir = usb_endpoint_dir_in(desc) ? 'I' : 'O'; | |
191 | ||
1da177e4 | 192 | if (speed == USB_SPEED_HIGH) { |
29cc8897 | 193 | switch (usb_endpoint_maxp(desc) & (0x03 << 11)) { |
44526f91 CSA |
194 | case 1 << 11: |
195 | bandwidth = 2; break; | |
196 | case 2 << 11: | |
197 | bandwidth = 3; break; | |
1da177e4 LT |
198 | } |
199 | } | |
200 | ||
201 | /* this isn't checking for illegal values */ | |
2e0fe709 | 202 | switch (usb_endpoint_type(desc)) { |
1da177e4 LT |
203 | case USB_ENDPOINT_XFER_CONTROL: |
204 | type = "Ctrl"; | |
44526f91 | 205 | if (speed == USB_SPEED_HIGH) /* uframes per NAK */ |
1da177e4 LT |
206 | interval = desc->bInterval; |
207 | else | |
208 | interval = 0; | |
209 | dir = 'B'; /* ctrl is bidirectional */ | |
210 | break; | |
211 | case USB_ENDPOINT_XFER_ISOC: | |
212 | type = "Isoc"; | |
213 | interval = 1 << (desc->bInterval - 1); | |
214 | break; | |
215 | case USB_ENDPOINT_XFER_BULK: | |
216 | type = "Bulk"; | |
87ad46c9 | 217 | if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */ |
1da177e4 LT |
218 | interval = desc->bInterval; |
219 | else | |
220 | interval = 0; | |
221 | break; | |
222 | case USB_ENDPOINT_XFER_INT: | |
223 | type = "Int."; | |
dbb9fe1f | 224 | if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER) |
1da177e4 | 225 | interval = 1 << (desc->bInterval - 1); |
1a68f71d | 226 | else |
1da177e4 LT |
227 | interval = desc->bInterval; |
228 | break; | |
229 | default: /* "can't happen" */ | |
230 | return start; | |
231 | } | |
2868a2b1 | 232 | interval *= (speed == USB_SPEED_HIGH || |
dbb9fe1f | 233 | speed >= USB_SPEED_SUPER) ? 125 : 1000; |
1da177e4 LT |
234 | if (interval % 1000) |
235 | unit = 'u'; | |
236 | else { | |
237 | unit = 'm'; | |
238 | interval /= 1000; | |
239 | } | |
240 | ||
241 | start += sprintf(start, format_endpt, desc->bEndpointAddress, dir, | |
242 | desc->bmAttributes, type, | |
29cc8897 | 243 | (usb_endpoint_maxp(desc) & 0x07ff) * |
376c0d3f | 244 | bandwidth, |
1da177e4 LT |
245 | interval, unit); |
246 | return start; | |
247 | } | |
248 | ||
249 | static char *usb_dump_interface_descriptor(char *start, char *end, | |
376c0d3f GKH |
250 | const struct usb_interface_cache *intfc, |
251 | const struct usb_interface *iface, | |
252 | int setno) | |
1da177e4 | 253 | { |
376c0d3f | 254 | const struct usb_interface_descriptor *desc; |
8d790d74 | 255 | const char *driver_name = ""; |
2360e4aa | 256 | int active = 0; |
1da177e4 LT |
257 | |
258 | if (start > end) | |
259 | return start; | |
376c0d3f | 260 | desc = &intfc->altsetting[setno].desc; |
2360e4aa | 261 | if (iface) { |
1da177e4 LT |
262 | driver_name = (iface->dev.driver |
263 | ? iface->dev.driver->name | |
264 | : "(none)"); | |
2360e4aa DB |
265 | active = (desc == &iface->cur_altsetting->desc); |
266 | } | |
1da177e4 | 267 | start += sprintf(start, format_iface, |
2360e4aa | 268 | active ? '*' : ' ', /* mark active altsetting */ |
1da177e4 LT |
269 | desc->bInterfaceNumber, |
270 | desc->bAlternateSetting, | |
271 | desc->bNumEndpoints, | |
272 | desc->bInterfaceClass, | |
273 | class_decode(desc->bInterfaceClass), | |
274 | desc->bInterfaceSubClass, | |
275 | desc->bInterfaceProtocol, | |
276 | driver_name); | |
1da177e4 LT |
277 | return start; |
278 | } | |
279 | ||
376c0d3f GKH |
280 | static char *usb_dump_interface(int speed, char *start, char *end, |
281 | const struct usb_interface_cache *intfc, | |
282 | const struct usb_interface *iface, int setno) | |
283 | { | |
1da177e4 LT |
284 | const struct usb_host_interface *desc = &intfc->altsetting[setno]; |
285 | int i; | |
286 | ||
287 | start = usb_dump_interface_descriptor(start, end, intfc, iface, setno); | |
288 | for (i = 0; i < desc->desc.bNumEndpoints; i++) { | |
289 | if (start > end) | |
290 | return start; | |
291 | start = usb_dump_endpoint_descriptor(speed, | |
292 | start, end, &desc->endpoint[i].desc); | |
293 | } | |
294 | return start; | |
295 | } | |
296 | ||
165fe97e | 297 | static char *usb_dump_iad_descriptor(char *start, char *end, |
376c0d3f | 298 | const struct usb_interface_assoc_descriptor *iad) |
165fe97e CN |
299 | { |
300 | if (start > end) | |
301 | return start; | |
302 | start += sprintf(start, format_iad, | |
303 | iad->bFirstInterface, | |
304 | iad->bInterfaceCount, | |
305 | iad->bFunctionClass, | |
306 | class_decode(iad->bFunctionClass), | |
307 | iad->bFunctionSubClass, | |
308 | iad->bFunctionProtocol); | |
309 | return start; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /* TBD: |
313 | * 0. TBDs | |
314 | * 1. marking active interface altsettings (code lists all, but should mark | |
315 | * which ones are active, if any) | |
316 | */ | |
376c0d3f GKH |
317 | static char *usb_dump_config_descriptor(char *start, char *end, |
318 | const struct usb_config_descriptor *desc, | |
8d8479db | 319 | int active, int speed) |
1da177e4 | 320 | { |
8d8479db SAS |
321 | int mul; |
322 | ||
1da177e4 LT |
323 | if (start > end) |
324 | return start; | |
dbb9fe1f | 325 | if (speed >= USB_SPEED_SUPER) |
8d8479db SAS |
326 | mul = 8; |
327 | else | |
328 | mul = 2; | |
1da177e4 | 329 | start += sprintf(start, format_config, |
376c0d3f GKH |
330 | /* mark active/actual/current cfg. */ |
331 | active ? '*' : ' ', | |
1da177e4 LT |
332 | desc->bNumInterfaces, |
333 | desc->bConfigurationValue, | |
334 | desc->bmAttributes, | |
8d8479db | 335 | desc->bMaxPower * mul); |
1da177e4 LT |
336 | return start; |
337 | } | |
338 | ||
376c0d3f GKH |
339 | static char *usb_dump_config(int speed, char *start, char *end, |
340 | const struct usb_host_config *config, int active) | |
1da177e4 LT |
341 | { |
342 | int i, j; | |
343 | struct usb_interface_cache *intfc; | |
344 | struct usb_interface *interface; | |
345 | ||
346 | if (start > end) | |
347 | return start; | |
376c0d3f GKH |
348 | if (!config) |
349 | /* getting these some in 2.3.7; none in 2.3.6 */ | |
1da177e4 | 350 | return start + sprintf(start, "(null Cfg. desc.)\n"); |
8d8479db SAS |
351 | start = usb_dump_config_descriptor(start, end, &config->desc, active, |
352 | speed); | |
165fe97e CN |
353 | for (i = 0; i < USB_MAXIADS; i++) { |
354 | if (config->intf_assoc[i] == NULL) | |
355 | break; | |
356 | start = usb_dump_iad_descriptor(start, end, | |
357 | config->intf_assoc[i]); | |
358 | } | |
1da177e4 LT |
359 | for (i = 0; i < config->desc.bNumInterfaces; i++) { |
360 | intfc = config->intf_cache[i]; | |
361 | interface = config->interface[i]; | |
362 | for (j = 0; j < intfc->num_altsetting; j++) { | |
363 | if (start > end) | |
364 | return start; | |
365 | start = usb_dump_interface(speed, | |
366 | start, end, intfc, interface, j); | |
367 | } | |
368 | } | |
369 | return start; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Dump the different USB descriptors. | |
374 | */ | |
376c0d3f GKH |
375 | static char *usb_dump_device_descriptor(char *start, char *end, |
376 | const struct usb_device_descriptor *desc) | |
1da177e4 LT |
377 | { |
378 | u16 bcdUSB = le16_to_cpu(desc->bcdUSB); | |
379 | u16 bcdDevice = le16_to_cpu(desc->bcdDevice); | |
380 | ||
381 | if (start > end) | |
382 | return start; | |
1a68f71d | 383 | start += sprintf(start, format_device1, |
1da177e4 LT |
384 | bcdUSB >> 8, bcdUSB & 0xff, |
385 | desc->bDeviceClass, | |
376c0d3f | 386 | class_decode(desc->bDeviceClass), |
1da177e4 LT |
387 | desc->bDeviceSubClass, |
388 | desc->bDeviceProtocol, | |
389 | desc->bMaxPacketSize0, | |
390 | desc->bNumConfigurations); | |
391 | if (start > end) | |
392 | return start; | |
393 | start += sprintf(start, format_device2, | |
394 | le16_to_cpu(desc->idVendor), | |
395 | le16_to_cpu(desc->idProduct), | |
396 | bcdDevice >> 8, bcdDevice & 0xff); | |
397 | return start; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Dump the different strings that this device holds. | |
402 | */ | |
376c0d3f GKH |
403 | static char *usb_dump_device_strings(char *start, char *end, |
404 | struct usb_device *dev) | |
1da177e4 LT |
405 | { |
406 | if (start > end) | |
407 | return start; | |
408 | if (dev->manufacturer) | |
376c0d3f GKH |
409 | start += sprintf(start, format_string_manufacturer, |
410 | dev->manufacturer); | |
1da177e4 LT |
411 | if (start > end) |
412 | goto out; | |
413 | if (dev->product) | |
414 | start += sprintf(start, format_string_product, dev->product); | |
415 | if (start > end) | |
416 | goto out; | |
417 | #ifdef ALLOW_SERIAL_NUMBER | |
418 | if (dev->serial) | |
376c0d3f GKH |
419 | start += sprintf(start, format_string_serialnumber, |
420 | dev->serial); | |
1da177e4 LT |
421 | #endif |
422 | out: | |
423 | return start; | |
424 | } | |
425 | ||
426 | static char *usb_dump_desc(char *start, char *end, struct usb_device *dev) | |
427 | { | |
428 | int i; | |
429 | ||
430 | if (start > end) | |
431 | return start; | |
376c0d3f | 432 | |
1da177e4 LT |
433 | start = usb_dump_device_descriptor(start, end, &dev->descriptor); |
434 | ||
435 | if (start > end) | |
436 | return start; | |
376c0d3f | 437 | |
1a68f71d | 438 | start = usb_dump_device_strings(start, end, dev); |
1da177e4 LT |
439 | |
440 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { | |
441 | if (start > end) | |
442 | return start; | |
443 | start = usb_dump_config(dev->speed, | |
444 | start, end, dev->config + i, | |
445 | /* active ? */ | |
446 | (dev->config + i) == dev->actconfig); | |
447 | } | |
448 | return start; | |
449 | } | |
450 | ||
451 | ||
452 | #ifdef PROC_EXTRA /* TBD: may want to add this code later */ | |
453 | ||
376c0d3f GKH |
454 | static char *usb_dump_hub_descriptor(char *start, char *end, |
455 | const struct usb_hub_descriptor *desc) | |
1da177e4 LT |
456 | { |
457 | int leng = USB_DT_HUB_NONVAR_SIZE; | |
458 | unsigned char *ptr = (unsigned char *)desc; | |
459 | ||
460 | if (start > end) | |
461 | return start; | |
462 | start += sprintf(start, "Interface:"); | |
463 | while (leng && start <= end) { | |
464 | start += sprintf(start, " %02x", *ptr); | |
465 | ptr++; leng--; | |
466 | } | |
467 | *start++ = '\n'; | |
468 | return start; | |
469 | } | |
470 | ||
376c0d3f GKH |
471 | static char *usb_dump_string(char *start, char *end, |
472 | const struct usb_device *dev, char *id, int index) | |
1da177e4 LT |
473 | { |
474 | if (start > end) | |
475 | return start; | |
476 | start += sprintf(start, "Interface:"); | |
376c0d3f GKH |
477 | if (index <= dev->maxstring && dev->stringindex && |
478 | dev->stringindex[index]) | |
479 | start += sprintf(start, "%s: %.100s ", id, | |
480 | dev->stringindex[index]); | |
1da177e4 LT |
481 | return start; |
482 | } | |
483 | ||
484 | #endif /* PROC_EXTRA */ | |
485 | ||
486 | /*****************************************************************/ | |
487 | ||
488 | /* This is a recursive function. Parameters: | |
489 | * buffer - the user-space buffer to write data into | |
490 | * nbytes - the maximum number of bytes to write | |
491 | * skip_bytes - the number of bytes to skip before writing anything | |
492 | * file_offset - the offset into the devices file on completion | |
493 | * The caller must own the device lock. | |
494 | */ | |
376c0d3f GKH |
495 | static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, |
496 | loff_t *skip_bytes, loff_t *file_offset, | |
497 | struct usb_device *usbdev, struct usb_bus *bus, | |
498 | int level, int index, int count) | |
1da177e4 LT |
499 | { |
500 | int chix; | |
501 | int ret, cnt = 0; | |
502 | int parent_devnum = 0; | |
503 | char *pages_start, *data_end, *speed; | |
504 | unsigned int length; | |
505 | ssize_t total_written = 0; | |
ff823c79 | 506 | struct usb_device *childdev = NULL; |
376c0d3f | 507 | |
1da177e4 LT |
508 | /* don't bother with anything else if we're not writing any data */ |
509 | if (*nbytes <= 0) | |
510 | return 0; | |
376c0d3f | 511 | |
1da177e4 LT |
512 | if (level > MAX_TOPO_LEVEL) |
513 | return 0; | |
376c0d3f GKH |
514 | /* allocate 2^1 pages = 8K (on i386); |
515 | * should be more than enough for one device */ | |
acbe2feb | 516 | pages_start = (char *)__get_free_pages(GFP_NOIO, 1); |
376c0d3f GKH |
517 | if (!pages_start) |
518 | return -ENOMEM; | |
519 | ||
1da177e4 LT |
520 | if (usbdev->parent && usbdev->parent->devnum != -1) |
521 | parent_devnum = usbdev->parent->devnum; | |
522 | /* | |
523 | * So the root hub's parent is 0 and any device that is | |
524 | * plugged into the root hub has a parent of 0. | |
525 | */ | |
526 | switch (usbdev->speed) { | |
527 | case USB_SPEED_LOW: | |
528 | speed = "1.5"; break; | |
529 | case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */ | |
530 | case USB_SPEED_FULL: | |
834e2312 AS |
531 | speed = "12"; break; |
532 | case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */ | |
1da177e4 LT |
533 | case USB_SPEED_HIGH: |
534 | speed = "480"; break; | |
834e2312 AS |
535 | case USB_SPEED_SUPER: |
536 | speed = "5000"; break; | |
dbb9fe1f MN |
537 | case USB_SPEED_SUPER_PLUS: |
538 | speed = "10000"; break; | |
1da177e4 | 539 | default: |
834e2312 | 540 | speed = "??"; |
1da177e4 LT |
541 | } |
542 | data_end = pages_start + sprintf(pages_start, format_topo, | |
543 | bus->busnum, level, parent_devnum, | |
544 | index, count, usbdev->devnum, | |
545 | speed, usbdev->maxchild); | |
546 | /* | |
547 | * level = topology-tier level; | |
548 | * parent_devnum = parent device number; | |
549 | * index = parent's connector number; | |
550 | * count = device count at this level | |
551 | */ | |
552 | /* If this is the root hub, display the bandwidth information */ | |
553 | if (level == 0) { | |
554 | int max; | |
555 | ||
2868a2b1 DT |
556 | /* super/high speed reserves 80%, full/low reserves 90% */ |
557 | if (usbdev->speed == USB_SPEED_HIGH || | |
dbb9fe1f | 558 | usbdev->speed >= USB_SPEED_SUPER) |
1da177e4 LT |
559 | max = 800; |
560 | else | |
561 | max = FRAME_TIME_MAX_USECS_ALLOC; | |
562 | ||
563 | /* report "average" periodic allocation over a microsecond. | |
564 | * the schedules are actually bursty, HCDs need to deal with | |
565 | * that and just compute/report this average. | |
566 | */ | |
567 | data_end += sprintf(data_end, format_bandwidth, | |
568 | bus->bandwidth_allocated, max, | |
569 | (100 * bus->bandwidth_allocated + max / 2) | |
570 | / max, | |
376c0d3f GKH |
571 | bus->bandwidth_int_reqs, |
572 | bus->bandwidth_isoc_reqs); | |
573 | ||
1da177e4 | 574 | } |
376c0d3f GKH |
575 | data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256, |
576 | usbdev); | |
577 | ||
1da177e4 LT |
578 | if (data_end > (pages_start + (2 * PAGE_SIZE) - 256)) |
579 | data_end += sprintf(data_end, "(truncated)\n"); | |
376c0d3f | 580 | |
1da177e4 LT |
581 | length = data_end - pages_start; |
582 | /* if we can start copying some data to the user */ | |
583 | if (length > *skip_bytes) { | |
584 | length -= *skip_bytes; | |
585 | if (length > *nbytes) | |
586 | length = *nbytes; | |
587 | if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) { | |
588 | free_pages((unsigned long)pages_start, 1); | |
589 | return -EFAULT; | |
590 | } | |
591 | *nbytes -= length; | |
592 | *file_offset += length; | |
593 | total_written += length; | |
594 | *buffer += length; | |
595 | *skip_bytes = 0; | |
596 | } else | |
597 | *skip_bytes -= length; | |
376c0d3f | 598 | |
1da177e4 | 599 | free_pages((unsigned long)pages_start, 1); |
376c0d3f | 600 | |
1da177e4 | 601 | /* Now look at all of this device's children. */ |
ff823c79 | 602 | usb_hub_for_each_child(usbdev, chix, childdev) { |
969ddcfc AS |
603 | usb_lock_device(childdev); |
604 | ret = usb_device_dump(buffer, nbytes, skip_bytes, | |
605 | file_offset, childdev, bus, | |
606 | level + 1, chix - 1, ++cnt); | |
607 | usb_unlock_device(childdev); | |
608 | if (ret == -EFAULT) | |
609 | return total_written; | |
610 | total_written += ret; | |
1da177e4 LT |
611 | } |
612 | return total_written; | |
613 | } | |
614 | ||
376c0d3f GKH |
615 | static ssize_t usb_device_read(struct file *file, char __user *buf, |
616 | size_t nbytes, loff_t *ppos) | |
1da177e4 LT |
617 | { |
618 | struct usb_bus *bus; | |
619 | ssize_t ret, total_written = 0; | |
620 | loff_t skip_bytes = *ppos; | |
621 | ||
622 | if (*ppos < 0) | |
623 | return -EINVAL; | |
624 | if (nbytes <= 0) | |
625 | return 0; | |
626 | if (!access_ok(VERIFY_WRITE, buf, nbytes)) | |
627 | return -EFAULT; | |
628 | ||
4186ecf8 | 629 | mutex_lock(&usb_bus_list_lock); |
1da177e4 LT |
630 | /* print devices for all busses */ |
631 | list_for_each_entry(bus, &usb_bus_list, bus_list) { | |
632 | /* recurse through all children of the root hub */ | |
0a231403 | 633 | if (!bus_to_hcd(bus)->rh_registered) |
1da177e4 LT |
634 | continue; |
635 | usb_lock_device(bus->root_hub); | |
376c0d3f GKH |
636 | ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos, |
637 | bus->root_hub, bus, 0, 0, 0); | |
1da177e4 LT |
638 | usb_unlock_device(bus->root_hub); |
639 | if (ret < 0) { | |
4186ecf8 | 640 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
641 | return ret; |
642 | } | |
643 | total_written += ret; | |
644 | } | |
4186ecf8 | 645 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
646 | return total_written; |
647 | } | |
648 | ||
649 | /* Kernel lock for "lastev" protection */ | |
376c0d3f GKH |
650 | static unsigned int usb_device_poll(struct file *file, |
651 | struct poll_table_struct *wait) | |
1da177e4 | 652 | { |
7bc80cd9 | 653 | unsigned int event_count; |
554f7696 | 654 | |
7bc80cd9 | 655 | poll_wait(file, &device_event.wait, wait); |
1da177e4 | 656 | |
7bc80cd9 LT |
657 | event_count = atomic_read(&device_event.count); |
658 | if (file->f_version != event_count) { | |
659 | file->f_version = event_count; | |
660 | return POLLIN | POLLRDNORM; | |
661 | } | |
1da177e4 | 662 | |
376c0d3f | 663 | return 0; |
1da177e4 LT |
664 | } |
665 | ||
376c0d3f | 666 | static loff_t usb_device_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
667 | { |
668 | loff_t ret; | |
669 | ||
496ad9aa | 670 | mutex_lock(&file_inode(file)->i_mutex); |
1da177e4 LT |
671 | |
672 | switch (orig) { | |
673 | case 0: | |
674 | file->f_pos = offset; | |
675 | ret = file->f_pos; | |
676 | break; | |
677 | case 1: | |
678 | file->f_pos += offset; | |
679 | ret = file->f_pos; | |
680 | break; | |
681 | case 2: | |
682 | default: | |
683 | ret = -EINVAL; | |
684 | } | |
685 | ||
496ad9aa | 686 | mutex_unlock(&file_inode(file)->i_mutex); |
1da177e4 LT |
687 | return ret; |
688 | } | |
689 | ||
066202dd | 690 | const struct file_operations usbfs_devices_fops = { |
1da177e4 LT |
691 | .llseek = usb_device_lseek, |
692 | .read = usb_device_read, | |
693 | .poll = usb_device_poll, | |
1da177e4 | 694 | }; |