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Commit | Line | Data |
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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 | * | |
21470e32 | 27 | * I considered using /dev/bus/usb/device# for each device |
1da177e4 LT |
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. | |
21470e32 | 43 | * Added a poll method to /sys/kernel/debug/usb/devices, to wake |
1da177e4 LT |
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 | ||
7bc80cd9 LT |
113 | /* |
114 | * Wait for an connect/disconnect event to happen. We initialize | |
115 | * the event counter with an odd number, and each event will increment | |
116 | * the event counter by two, so it will always _stay_ odd. That means | |
117 | * that it will never be zero, so "event 0" will never match a current | |
118 | * event, and thus 'poll' will always trigger as readable for the first | |
119 | * time it gets called. | |
120 | */ | |
121 | static struct device_connect_event { | |
122 | atomic_t count; | |
123 | wait_queue_head_t wait; | |
124 | } device_event = { | |
125 | .count = ATOMIC_INIT(1), | |
126 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait) | |
127 | }; | |
1da177e4 | 128 | |
1da177e4 LT |
129 | struct class_info { |
130 | int class; | |
131 | char *class_name; | |
132 | }; | |
133 | ||
44526f91 CSA |
134 | static const struct class_info clas_info[] = { |
135 | /* max. 5 chars. per name string */ | |
1da177e4 LT |
136 | {USB_CLASS_PER_INTERFACE, ">ifc"}, |
137 | {USB_CLASS_AUDIO, "audio"}, | |
138 | {USB_CLASS_COMM, "comm."}, | |
139 | {USB_CLASS_HID, "HID"}, | |
1da177e4 | 140 | {USB_CLASS_PHYSICAL, "PID"}, |
bf7fbb02 | 141 | {USB_CLASS_STILL_IMAGE, "still"}, |
1da177e4 LT |
142 | {USB_CLASS_PRINTER, "print"}, |
143 | {USB_CLASS_MASS_STORAGE, "stor."}, | |
bf7fbb02 | 144 | {USB_CLASS_HUB, "hub"}, |
1da177e4 | 145 | {USB_CLASS_CDC_DATA, "data"}, |
1da177e4 LT |
146 | {USB_CLASS_CSCID, "scard"}, |
147 | {USB_CLASS_CONTENT_SEC, "c-sec"}, | |
165fe97e | 148 | {USB_CLASS_VIDEO, "video"}, |
bf7fbb02 FP |
149 | {USB_CLASS_WIRELESS_CONTROLLER, "wlcon"}, |
150 | {USB_CLASS_MISC, "misc"}, | |
151 | {USB_CLASS_APP_SPEC, "app."}, | |
152 | {USB_CLASS_VENDOR_SPEC, "vend."}, | |
1da177e4 LT |
153 | {-1, "unk."} /* leave as last */ |
154 | }; | |
155 | ||
156 | /*****************************************************************/ | |
157 | ||
158 | void usbfs_conn_disc_event(void) | |
159 | { | |
7bc80cd9 LT |
160 | atomic_add(2, &device_event.count); |
161 | wake_up(&device_event.wait); | |
1da177e4 LT |
162 | } |
163 | ||
164 | static const char *class_decode(const int class) | |
165 | { | |
166 | int ix; | |
167 | ||
168 | for (ix = 0; clas_info[ix].class != -1; ix++) | |
169 | if (clas_info[ix].class == class) | |
170 | break; | |
1a68f71d | 171 | return clas_info[ix].class_name; |
1da177e4 LT |
172 | } |
173 | ||
376c0d3f GKH |
174 | static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end, |
175 | const struct usb_endpoint_descriptor *desc) | |
1da177e4 LT |
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 | ||
91f97521 FB |
185 | if (speed == USB_SPEED_HIGH) |
186 | bandwidth = usb_endpoint_maxp_mult(desc); | |
1da177e4 LT |
187 | |
188 | /* this isn't checking for illegal values */ | |
2e0fe709 | 189 | switch (usb_endpoint_type(desc)) { |
1da177e4 LT |
190 | case USB_ENDPOINT_XFER_CONTROL: |
191 | type = "Ctrl"; | |
44526f91 | 192 | if (speed == USB_SPEED_HIGH) /* uframes per NAK */ |
1da177e4 LT |
193 | interval = desc->bInterval; |
194 | else | |
195 | interval = 0; | |
196 | dir = 'B'; /* ctrl is bidirectional */ | |
197 | break; | |
198 | case USB_ENDPOINT_XFER_ISOC: | |
199 | type = "Isoc"; | |
200 | interval = 1 << (desc->bInterval - 1); | |
201 | break; | |
202 | case USB_ENDPOINT_XFER_BULK: | |
203 | type = "Bulk"; | |
87ad46c9 | 204 | if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */ |
1da177e4 LT |
205 | interval = desc->bInterval; |
206 | else | |
207 | interval = 0; | |
208 | break; | |
209 | case USB_ENDPOINT_XFER_INT: | |
210 | type = "Int."; | |
8a1b2725 | 211 | if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER) |
1da177e4 | 212 | interval = 1 << (desc->bInterval - 1); |
1a68f71d | 213 | else |
1da177e4 LT |
214 | interval = desc->bInterval; |
215 | break; | |
216 | default: /* "can't happen" */ | |
217 | return start; | |
218 | } | |
2868a2b1 | 219 | interval *= (speed == USB_SPEED_HIGH || |
8a1b2725 | 220 | speed >= USB_SPEED_SUPER) ? 125 : 1000; |
1da177e4 LT |
221 | if (interval % 1000) |
222 | unit = 'u'; | |
223 | else { | |
224 | unit = 'm'; | |
225 | interval /= 1000; | |
226 | } | |
227 | ||
228 | start += sprintf(start, format_endpt, desc->bEndpointAddress, dir, | |
229 | desc->bmAttributes, type, | |
c091b6b3 | 230 | usb_endpoint_maxp(desc) * |
376c0d3f | 231 | bandwidth, |
1da177e4 LT |
232 | interval, unit); |
233 | return start; | |
234 | } | |
235 | ||
236 | static char *usb_dump_interface_descriptor(char *start, char *end, | |
376c0d3f GKH |
237 | const struct usb_interface_cache *intfc, |
238 | const struct usb_interface *iface, | |
239 | int setno) | |
1da177e4 | 240 | { |
376c0d3f | 241 | const struct usb_interface_descriptor *desc; |
8d790d74 | 242 | const char *driver_name = ""; |
2360e4aa | 243 | int active = 0; |
1da177e4 LT |
244 | |
245 | if (start > end) | |
246 | return start; | |
376c0d3f | 247 | desc = &intfc->altsetting[setno].desc; |
2360e4aa | 248 | if (iface) { |
1da177e4 LT |
249 | driver_name = (iface->dev.driver |
250 | ? iface->dev.driver->name | |
251 | : "(none)"); | |
2360e4aa DB |
252 | active = (desc == &iface->cur_altsetting->desc); |
253 | } | |
1da177e4 | 254 | start += sprintf(start, format_iface, |
2360e4aa | 255 | active ? '*' : ' ', /* mark active altsetting */ |
1da177e4 LT |
256 | desc->bInterfaceNumber, |
257 | desc->bAlternateSetting, | |
258 | desc->bNumEndpoints, | |
259 | desc->bInterfaceClass, | |
260 | class_decode(desc->bInterfaceClass), | |
261 | desc->bInterfaceSubClass, | |
262 | desc->bInterfaceProtocol, | |
263 | driver_name); | |
1da177e4 LT |
264 | return start; |
265 | } | |
266 | ||
376c0d3f GKH |
267 | static char *usb_dump_interface(int speed, char *start, char *end, |
268 | const struct usb_interface_cache *intfc, | |
269 | const struct usb_interface *iface, int setno) | |
270 | { | |
1da177e4 LT |
271 | const struct usb_host_interface *desc = &intfc->altsetting[setno]; |
272 | int i; | |
273 | ||
274 | start = usb_dump_interface_descriptor(start, end, intfc, iface, setno); | |
275 | for (i = 0; i < desc->desc.bNumEndpoints; i++) { | |
276 | if (start > end) | |
277 | return start; | |
278 | start = usb_dump_endpoint_descriptor(speed, | |
279 | start, end, &desc->endpoint[i].desc); | |
280 | } | |
281 | return start; | |
282 | } | |
283 | ||
165fe97e | 284 | static char *usb_dump_iad_descriptor(char *start, char *end, |
376c0d3f | 285 | const struct usb_interface_assoc_descriptor *iad) |
165fe97e CN |
286 | { |
287 | if (start > end) | |
288 | return start; | |
289 | start += sprintf(start, format_iad, | |
290 | iad->bFirstInterface, | |
291 | iad->bInterfaceCount, | |
292 | iad->bFunctionClass, | |
293 | class_decode(iad->bFunctionClass), | |
294 | iad->bFunctionSubClass, | |
295 | iad->bFunctionProtocol); | |
296 | return start; | |
297 | } | |
298 | ||
1da177e4 LT |
299 | /* TBD: |
300 | * 0. TBDs | |
301 | * 1. marking active interface altsettings (code lists all, but should mark | |
302 | * which ones are active, if any) | |
303 | */ | |
376c0d3f GKH |
304 | static char *usb_dump_config_descriptor(char *start, char *end, |
305 | const struct usb_config_descriptor *desc, | |
8d8479db | 306 | int active, int speed) |
1da177e4 | 307 | { |
8d8479db SAS |
308 | int mul; |
309 | ||
1da177e4 LT |
310 | if (start > end) |
311 | return start; | |
8a1b2725 | 312 | if (speed >= USB_SPEED_SUPER) |
8d8479db SAS |
313 | mul = 8; |
314 | else | |
315 | mul = 2; | |
1da177e4 | 316 | start += sprintf(start, format_config, |
376c0d3f GKH |
317 | /* mark active/actual/current cfg. */ |
318 | active ? '*' : ' ', | |
1da177e4 LT |
319 | desc->bNumInterfaces, |
320 | desc->bConfigurationValue, | |
321 | desc->bmAttributes, | |
8d8479db | 322 | desc->bMaxPower * mul); |
1da177e4 LT |
323 | return start; |
324 | } | |
325 | ||
376c0d3f GKH |
326 | static char *usb_dump_config(int speed, char *start, char *end, |
327 | const struct usb_host_config *config, int active) | |
1da177e4 LT |
328 | { |
329 | int i, j; | |
330 | struct usb_interface_cache *intfc; | |
331 | struct usb_interface *interface; | |
332 | ||
333 | if (start > end) | |
334 | return start; | |
376c0d3f GKH |
335 | if (!config) |
336 | /* getting these some in 2.3.7; none in 2.3.6 */ | |
1da177e4 | 337 | return start + sprintf(start, "(null Cfg. desc.)\n"); |
8d8479db SAS |
338 | start = usb_dump_config_descriptor(start, end, &config->desc, active, |
339 | speed); | |
165fe97e CN |
340 | for (i = 0; i < USB_MAXIADS; i++) { |
341 | if (config->intf_assoc[i] == NULL) | |
342 | break; | |
343 | start = usb_dump_iad_descriptor(start, end, | |
344 | config->intf_assoc[i]); | |
345 | } | |
1da177e4 LT |
346 | for (i = 0; i < config->desc.bNumInterfaces; i++) { |
347 | intfc = config->intf_cache[i]; | |
348 | interface = config->interface[i]; | |
349 | for (j = 0; j < intfc->num_altsetting; j++) { | |
350 | if (start > end) | |
351 | return start; | |
352 | start = usb_dump_interface(speed, | |
353 | start, end, intfc, interface, j); | |
354 | } | |
355 | } | |
356 | return start; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Dump the different USB descriptors. | |
361 | */ | |
376c0d3f GKH |
362 | static char *usb_dump_device_descriptor(char *start, char *end, |
363 | const struct usb_device_descriptor *desc) | |
1da177e4 LT |
364 | { |
365 | u16 bcdUSB = le16_to_cpu(desc->bcdUSB); | |
366 | u16 bcdDevice = le16_to_cpu(desc->bcdDevice); | |
367 | ||
368 | if (start > end) | |
369 | return start; | |
1a68f71d | 370 | start += sprintf(start, format_device1, |
1da177e4 LT |
371 | bcdUSB >> 8, bcdUSB & 0xff, |
372 | desc->bDeviceClass, | |
376c0d3f | 373 | class_decode(desc->bDeviceClass), |
1da177e4 LT |
374 | desc->bDeviceSubClass, |
375 | desc->bDeviceProtocol, | |
376 | desc->bMaxPacketSize0, | |
377 | desc->bNumConfigurations); | |
378 | if (start > end) | |
379 | return start; | |
380 | start += sprintf(start, format_device2, | |
381 | le16_to_cpu(desc->idVendor), | |
382 | le16_to_cpu(desc->idProduct), | |
383 | bcdDevice >> 8, bcdDevice & 0xff); | |
384 | return start; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Dump the different strings that this device holds. | |
389 | */ | |
376c0d3f GKH |
390 | static char *usb_dump_device_strings(char *start, char *end, |
391 | struct usb_device *dev) | |
1da177e4 LT |
392 | { |
393 | if (start > end) | |
394 | return start; | |
395 | if (dev->manufacturer) | |
376c0d3f GKH |
396 | start += sprintf(start, format_string_manufacturer, |
397 | dev->manufacturer); | |
1da177e4 LT |
398 | if (start > end) |
399 | goto out; | |
400 | if (dev->product) | |
401 | start += sprintf(start, format_string_product, dev->product); | |
402 | if (start > end) | |
403 | goto out; | |
404 | #ifdef ALLOW_SERIAL_NUMBER | |
405 | if (dev->serial) | |
376c0d3f GKH |
406 | start += sprintf(start, format_string_serialnumber, |
407 | dev->serial); | |
1da177e4 LT |
408 | #endif |
409 | out: | |
410 | return start; | |
411 | } | |
412 | ||
413 | static char *usb_dump_desc(char *start, char *end, struct usb_device *dev) | |
414 | { | |
415 | int i; | |
416 | ||
417 | if (start > end) | |
418 | return start; | |
376c0d3f | 419 | |
1da177e4 LT |
420 | start = usb_dump_device_descriptor(start, end, &dev->descriptor); |
421 | ||
422 | if (start > end) | |
423 | return start; | |
376c0d3f | 424 | |
1a68f71d | 425 | start = usb_dump_device_strings(start, end, dev); |
1da177e4 LT |
426 | |
427 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { | |
428 | if (start > end) | |
429 | return start; | |
430 | start = usb_dump_config(dev->speed, | |
431 | start, end, dev->config + i, | |
432 | /* active ? */ | |
433 | (dev->config + i) == dev->actconfig); | |
434 | } | |
435 | return start; | |
436 | } | |
437 | ||
438 | ||
439 | #ifdef PROC_EXTRA /* TBD: may want to add this code later */ | |
440 | ||
376c0d3f GKH |
441 | static char *usb_dump_hub_descriptor(char *start, char *end, |
442 | const struct usb_hub_descriptor *desc) | |
1da177e4 LT |
443 | { |
444 | int leng = USB_DT_HUB_NONVAR_SIZE; | |
445 | unsigned char *ptr = (unsigned char *)desc; | |
446 | ||
447 | if (start > end) | |
448 | return start; | |
449 | start += sprintf(start, "Interface:"); | |
450 | while (leng && start <= end) { | |
451 | start += sprintf(start, " %02x", *ptr); | |
452 | ptr++; leng--; | |
453 | } | |
454 | *start++ = '\n'; | |
455 | return start; | |
456 | } | |
457 | ||
376c0d3f GKH |
458 | static char *usb_dump_string(char *start, char *end, |
459 | const struct usb_device *dev, char *id, int index) | |
1da177e4 LT |
460 | { |
461 | if (start > end) | |
462 | return start; | |
463 | start += sprintf(start, "Interface:"); | |
376c0d3f GKH |
464 | if (index <= dev->maxstring && dev->stringindex && |
465 | dev->stringindex[index]) | |
466 | start += sprintf(start, "%s: %.100s ", id, | |
467 | dev->stringindex[index]); | |
1da177e4 LT |
468 | return start; |
469 | } | |
470 | ||
471 | #endif /* PROC_EXTRA */ | |
472 | ||
473 | /*****************************************************************/ | |
474 | ||
475 | /* This is a recursive function. Parameters: | |
476 | * buffer - the user-space buffer to write data into | |
477 | * nbytes - the maximum number of bytes to write | |
478 | * skip_bytes - the number of bytes to skip before writing anything | |
479 | * file_offset - the offset into the devices file on completion | |
480 | * The caller must own the device lock. | |
481 | */ | |
376c0d3f GKH |
482 | static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, |
483 | loff_t *skip_bytes, loff_t *file_offset, | |
484 | struct usb_device *usbdev, struct usb_bus *bus, | |
485 | int level, int index, int count) | |
1da177e4 LT |
486 | { |
487 | int chix; | |
488 | int ret, cnt = 0; | |
489 | int parent_devnum = 0; | |
490 | char *pages_start, *data_end, *speed; | |
491 | unsigned int length; | |
492 | ssize_t total_written = 0; | |
ff823c79 | 493 | struct usb_device *childdev = NULL; |
376c0d3f | 494 | |
1da177e4 LT |
495 | /* don't bother with anything else if we're not writing any data */ |
496 | if (*nbytes <= 0) | |
497 | return 0; | |
376c0d3f | 498 | |
1da177e4 LT |
499 | if (level > MAX_TOPO_LEVEL) |
500 | return 0; | |
376c0d3f GKH |
501 | /* allocate 2^1 pages = 8K (on i386); |
502 | * should be more than enough for one device */ | |
acbe2feb | 503 | pages_start = (char *)__get_free_pages(GFP_NOIO, 1); |
376c0d3f GKH |
504 | if (!pages_start) |
505 | return -ENOMEM; | |
506 | ||
1da177e4 LT |
507 | if (usbdev->parent && usbdev->parent->devnum != -1) |
508 | parent_devnum = usbdev->parent->devnum; | |
509 | /* | |
510 | * So the root hub's parent is 0 and any device that is | |
511 | * plugged into the root hub has a parent of 0. | |
512 | */ | |
513 | switch (usbdev->speed) { | |
514 | case USB_SPEED_LOW: | |
515 | speed = "1.5"; break; | |
516 | case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */ | |
517 | case USB_SPEED_FULL: | |
834e2312 AS |
518 | speed = "12"; break; |
519 | case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */ | |
1da177e4 LT |
520 | case USB_SPEED_HIGH: |
521 | speed = "480"; break; | |
834e2312 AS |
522 | case USB_SPEED_SUPER: |
523 | speed = "5000"; break; | |
8a1b2725 MN |
524 | case USB_SPEED_SUPER_PLUS: |
525 | speed = "10000"; break; | |
1da177e4 | 526 | default: |
834e2312 | 527 | speed = "??"; |
1da177e4 LT |
528 | } |
529 | data_end = pages_start + sprintf(pages_start, format_topo, | |
530 | bus->busnum, level, parent_devnum, | |
531 | index, count, usbdev->devnum, | |
532 | speed, usbdev->maxchild); | |
533 | /* | |
534 | * level = topology-tier level; | |
535 | * parent_devnum = parent device number; | |
536 | * index = parent's connector number; | |
537 | * count = device count at this level | |
538 | */ | |
539 | /* If this is the root hub, display the bandwidth information */ | |
540 | if (level == 0) { | |
541 | int max; | |
542 | ||
2868a2b1 DT |
543 | /* super/high speed reserves 80%, full/low reserves 90% */ |
544 | if (usbdev->speed == USB_SPEED_HIGH || | |
8a1b2725 | 545 | usbdev->speed >= USB_SPEED_SUPER) |
1da177e4 LT |
546 | max = 800; |
547 | else | |
548 | max = FRAME_TIME_MAX_USECS_ALLOC; | |
549 | ||
550 | /* report "average" periodic allocation over a microsecond. | |
551 | * the schedules are actually bursty, HCDs need to deal with | |
552 | * that and just compute/report this average. | |
553 | */ | |
554 | data_end += sprintf(data_end, format_bandwidth, | |
555 | bus->bandwidth_allocated, max, | |
556 | (100 * bus->bandwidth_allocated + max / 2) | |
557 | / max, | |
376c0d3f GKH |
558 | bus->bandwidth_int_reqs, |
559 | bus->bandwidth_isoc_reqs); | |
560 | ||
1da177e4 | 561 | } |
376c0d3f GKH |
562 | data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256, |
563 | usbdev); | |
564 | ||
1da177e4 LT |
565 | if (data_end > (pages_start + (2 * PAGE_SIZE) - 256)) |
566 | data_end += sprintf(data_end, "(truncated)\n"); | |
376c0d3f | 567 | |
1da177e4 LT |
568 | length = data_end - pages_start; |
569 | /* if we can start copying some data to the user */ | |
570 | if (length > *skip_bytes) { | |
571 | length -= *skip_bytes; | |
572 | if (length > *nbytes) | |
573 | length = *nbytes; | |
574 | if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) { | |
575 | free_pages((unsigned long)pages_start, 1); | |
576 | return -EFAULT; | |
577 | } | |
578 | *nbytes -= length; | |
579 | *file_offset += length; | |
580 | total_written += length; | |
581 | *buffer += length; | |
582 | *skip_bytes = 0; | |
583 | } else | |
584 | *skip_bytes -= length; | |
376c0d3f | 585 | |
1da177e4 | 586 | free_pages((unsigned long)pages_start, 1); |
376c0d3f | 587 | |
1da177e4 | 588 | /* Now look at all of this device's children. */ |
ff823c79 | 589 | usb_hub_for_each_child(usbdev, chix, childdev) { |
969ddcfc AS |
590 | usb_lock_device(childdev); |
591 | ret = usb_device_dump(buffer, nbytes, skip_bytes, | |
592 | file_offset, childdev, bus, | |
593 | level + 1, chix - 1, ++cnt); | |
594 | usb_unlock_device(childdev); | |
595 | if (ret == -EFAULT) | |
596 | return total_written; | |
597 | total_written += ret; | |
1da177e4 LT |
598 | } |
599 | return total_written; | |
600 | } | |
601 | ||
376c0d3f GKH |
602 | static ssize_t usb_device_read(struct file *file, char __user *buf, |
603 | size_t nbytes, loff_t *ppos) | |
1da177e4 LT |
604 | { |
605 | struct usb_bus *bus; | |
606 | ssize_t ret, total_written = 0; | |
607 | loff_t skip_bytes = *ppos; | |
5363de75 | 608 | int id; |
1da177e4 LT |
609 | |
610 | if (*ppos < 0) | |
611 | return -EINVAL; | |
612 | if (nbytes <= 0) | |
613 | return 0; | |
614 | if (!access_ok(VERIFY_WRITE, buf, nbytes)) | |
615 | return -EFAULT; | |
616 | ||
a4b5d606 | 617 | mutex_lock(&usb_bus_idr_lock); |
1da177e4 | 618 | /* print devices for all busses */ |
5363de75 | 619 | idr_for_each_entry(&usb_bus_idr, bus, id) { |
1da177e4 | 620 | /* recurse through all children of the root hub */ |
0a231403 | 621 | if (!bus_to_hcd(bus)->rh_registered) |
1da177e4 LT |
622 | continue; |
623 | usb_lock_device(bus->root_hub); | |
376c0d3f GKH |
624 | ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos, |
625 | bus->root_hub, bus, 0, 0, 0); | |
1da177e4 LT |
626 | usb_unlock_device(bus->root_hub); |
627 | if (ret < 0) { | |
a4b5d606 | 628 | mutex_unlock(&usb_bus_idr_lock); |
1da177e4 LT |
629 | return ret; |
630 | } | |
631 | total_written += ret; | |
632 | } | |
a4b5d606 | 633 | mutex_unlock(&usb_bus_idr_lock); |
1da177e4 LT |
634 | return total_written; |
635 | } | |
636 | ||
637 | /* Kernel lock for "lastev" protection */ | |
376c0d3f GKH |
638 | static unsigned int usb_device_poll(struct file *file, |
639 | struct poll_table_struct *wait) | |
1da177e4 | 640 | { |
7bc80cd9 | 641 | unsigned int event_count; |
554f7696 | 642 | |
7bc80cd9 | 643 | poll_wait(file, &device_event.wait, wait); |
1da177e4 | 644 | |
7bc80cd9 LT |
645 | event_count = atomic_read(&device_event.count); |
646 | if (file->f_version != event_count) { | |
647 | file->f_version = event_count; | |
648 | return POLLIN | POLLRDNORM; | |
649 | } | |
1da177e4 | 650 | |
376c0d3f | 651 | return 0; |
1da177e4 LT |
652 | } |
653 | ||
066202dd | 654 | const struct file_operations usbfs_devices_fops = { |
b25472f9 | 655 | .llseek = no_seek_end_llseek, |
1da177e4 LT |
656 | .read = usb_device_read, |
657 | .poll = usb_device_poll, | |
1da177e4 | 658 | }; |