Commit | Line | Data |
---|---|---|
5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1da177e4 LT |
2 | /* |
3 | * devices.c | |
4 | * (C) Copyright 1999 Randy Dunlap. | |
44526f91 CSA |
5 | * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. |
6 | * (proc file per device) | |
1da177e4 LT |
7 | * (C) Copyright 1999 Deti Fliegl (new USB architecture) |
8 | * | |
1da177e4 LT |
9 | ************************************************************* |
10 | * | |
11 | * <mountpoint>/devices contains USB topology, device, config, class, | |
12 | * interface, & endpoint data. | |
13 | * | |
21470e32 | 14 | * I considered using /dev/bus/usb/device# for each device |
1da177e4 LT |
15 | * as it is attached or detached, but I didn't like this for some |
16 | * reason -- maybe it's just too deep of a directory structure. | |
17 | * I also don't like looking in multiple places to gather and view | |
18 | * the data. Having only one file for ./devices also prevents race | |
19 | * conditions that could arise if a program was reading device info | |
20 | * for devices that are being removed (unplugged). (That is, the | |
21 | * program may find a directory for devnum_12 then try to open it, | |
22 | * but it was just unplugged, so the directory is now deleted. | |
23 | * But programs would just have to be prepared for situations like | |
24 | * this in any plug-and-play environment.) | |
25 | * | |
26 | * 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch> | |
27 | * Converted the whole proc stuff to real | |
28 | * read methods. Now not the whole device list needs to fit | |
29 | * into one page, only the device list for one bus. | |
21470e32 | 30 | * Added a poll method to /sys/kernel/debug/usb/devices, to wake |
1da177e4 LT |
31 | * up an eventual usbd |
32 | * 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch> | |
33 | * Turned into its own filesystem | |
34 | * 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk> | |
35 | * Converted file reading routine to dump to buffer once | |
36 | * per device, not per bus | |
1da177e4 LT |
37 | */ |
38 | ||
39 | #include <linux/fs.h> | |
40 | #include <linux/mm.h> | |
5a0e3ad6 | 41 | #include <linux/gfp.h> |
1da177e4 LT |
42 | #include <linux/poll.h> |
43 | #include <linux/usb.h> | |
1da177e4 | 44 | #include <linux/usbdevice_fs.h> |
27729aad | 45 | #include <linux/usb/hcd.h> |
4186ecf8 | 46 | #include <linux/mutex.h> |
44526f91 | 47 | #include <linux/uaccess.h> |
1da177e4 | 48 | |
6d5e8254 | 49 | #include "usb.h" |
1da177e4 | 50 | |
1da177e4 LT |
51 | /* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */ |
52 | #define ALLOW_SERIAL_NUMBER | |
53 | ||
bce1a702 | 54 | static const char format_topo[] = |
834e2312 AS |
55 | /* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd */ |
56 | "\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%-4s MxCh=%2d\n"; | |
1da177e4 | 57 | |
bce1a702 | 58 | static const char format_string_manufacturer[] = |
1da177e4 LT |
59 | /* S: Manufacturer=xxxx */ |
60 | "S: Manufacturer=%.100s\n"; | |
61 | ||
bce1a702 | 62 | static const char format_string_product[] = |
1da177e4 LT |
63 | /* S: Product=xxxx */ |
64 | "S: Product=%.100s\n"; | |
65 | ||
66 | #ifdef ALLOW_SERIAL_NUMBER | |
bce1a702 | 67 | static const char format_string_serialnumber[] = |
1da177e4 LT |
68 | /* S: SerialNumber=xxxx */ |
69 | "S: SerialNumber=%.100s\n"; | |
70 | #endif | |
71 | ||
bce1a702 | 72 | static const char format_bandwidth[] = |
1da177e4 LT |
73 | /* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */ |
74 | "B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n"; | |
376c0d3f | 75 | |
bce1a702 | 76 | static const char format_device1[] = |
1da177e4 LT |
77 | /* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */ |
78 | "D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n"; | |
79 | ||
bce1a702 | 80 | static const char format_device2[] = |
1da177e4 LT |
81 | /* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */ |
82 | "P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n"; | |
83 | ||
bce1a702 | 84 | static const char format_config[] = |
1da177e4 LT |
85 | /* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */ |
86 | "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n"; | |
376c0d3f | 87 | |
bce1a702 | 88 | static const char format_iad[] = |
165fe97e CN |
89 | /* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */ |
90 | "A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n"; | |
91 | ||
bce1a702 | 92 | static const char format_iface[] = |
1da177e4 | 93 | /* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/ |
2360e4aa | 94 | "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n"; |
1da177e4 | 95 | |
bce1a702 | 96 | static const char format_endpt[] = |
1da177e4 LT |
97 | /* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */ |
98 | "E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n"; | |
99 | ||
7bc80cd9 LT |
100 | /* |
101 | * Wait for an connect/disconnect event to happen. We initialize | |
102 | * the event counter with an odd number, and each event will increment | |
103 | * the event counter by two, so it will always _stay_ odd. That means | |
104 | * that it will never be zero, so "event 0" will never match a current | |
105 | * event, and thus 'poll' will always trigger as readable for the first | |
106 | * time it gets called. | |
107 | */ | |
108 | static struct device_connect_event { | |
109 | atomic_t count; | |
110 | wait_queue_head_t wait; | |
111 | } device_event = { | |
112 | .count = ATOMIC_INIT(1), | |
113 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait) | |
114 | }; | |
1da177e4 | 115 | |
1da177e4 LT |
116 | struct class_info { |
117 | int class; | |
118 | char *class_name; | |
119 | }; | |
120 | ||
44526f91 CSA |
121 | static const struct class_info clas_info[] = { |
122 | /* max. 5 chars. per name string */ | |
1da177e4 LT |
123 | {USB_CLASS_PER_INTERFACE, ">ifc"}, |
124 | {USB_CLASS_AUDIO, "audio"}, | |
125 | {USB_CLASS_COMM, "comm."}, | |
126 | {USB_CLASS_HID, "HID"}, | |
1da177e4 | 127 | {USB_CLASS_PHYSICAL, "PID"}, |
bf7fbb02 | 128 | {USB_CLASS_STILL_IMAGE, "still"}, |
1da177e4 LT |
129 | {USB_CLASS_PRINTER, "print"}, |
130 | {USB_CLASS_MASS_STORAGE, "stor."}, | |
bf7fbb02 | 131 | {USB_CLASS_HUB, "hub"}, |
1da177e4 | 132 | {USB_CLASS_CDC_DATA, "data"}, |
1da177e4 LT |
133 | {USB_CLASS_CSCID, "scard"}, |
134 | {USB_CLASS_CONTENT_SEC, "c-sec"}, | |
165fe97e | 135 | {USB_CLASS_VIDEO, "video"}, |
bf7fbb02 FP |
136 | {USB_CLASS_WIRELESS_CONTROLLER, "wlcon"}, |
137 | {USB_CLASS_MISC, "misc"}, | |
138 | {USB_CLASS_APP_SPEC, "app."}, | |
139 | {USB_CLASS_VENDOR_SPEC, "vend."}, | |
1da177e4 LT |
140 | {-1, "unk."} /* leave as last */ |
141 | }; | |
142 | ||
143 | /*****************************************************************/ | |
144 | ||
145 | void usbfs_conn_disc_event(void) | |
146 | { | |
7bc80cd9 LT |
147 | atomic_add(2, &device_event.count); |
148 | wake_up(&device_event.wait); | |
1da177e4 LT |
149 | } |
150 | ||
151 | static const char *class_decode(const int class) | |
152 | { | |
153 | int ix; | |
154 | ||
155 | for (ix = 0; clas_info[ix].class != -1; ix++) | |
156 | if (clas_info[ix].class == class) | |
157 | break; | |
1a68f71d | 158 | return clas_info[ix].class_name; |
1da177e4 LT |
159 | } |
160 | ||
376c0d3f GKH |
161 | static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end, |
162 | const struct usb_endpoint_descriptor *desc) | |
1da177e4 LT |
163 | { |
164 | char dir, unit, *type; | |
87ad46c9 | 165 | unsigned interval, bandwidth = 1; |
1da177e4 LT |
166 | |
167 | if (start > end) | |
168 | return start; | |
87ad46c9 LFC |
169 | |
170 | dir = usb_endpoint_dir_in(desc) ? 'I' : 'O'; | |
171 | ||
91f97521 FB |
172 | if (speed == USB_SPEED_HIGH) |
173 | bandwidth = usb_endpoint_maxp_mult(desc); | |
1da177e4 LT |
174 | |
175 | /* this isn't checking for illegal values */ | |
2e0fe709 | 176 | switch (usb_endpoint_type(desc)) { |
1da177e4 LT |
177 | case USB_ENDPOINT_XFER_CONTROL: |
178 | type = "Ctrl"; | |
44526f91 | 179 | if (speed == USB_SPEED_HIGH) /* uframes per NAK */ |
1da177e4 LT |
180 | interval = desc->bInterval; |
181 | else | |
182 | interval = 0; | |
183 | dir = 'B'; /* ctrl is bidirectional */ | |
184 | break; | |
185 | case USB_ENDPOINT_XFER_ISOC: | |
186 | type = "Isoc"; | |
187 | interval = 1 << (desc->bInterval - 1); | |
188 | break; | |
189 | case USB_ENDPOINT_XFER_BULK: | |
190 | type = "Bulk"; | |
87ad46c9 | 191 | if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */ |
1da177e4 LT |
192 | interval = desc->bInterval; |
193 | else | |
194 | interval = 0; | |
195 | break; | |
196 | case USB_ENDPOINT_XFER_INT: | |
197 | type = "Int."; | |
8a1b2725 | 198 | if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER) |
1da177e4 | 199 | interval = 1 << (desc->bInterval - 1); |
1a68f71d | 200 | else |
1da177e4 LT |
201 | interval = desc->bInterval; |
202 | break; | |
203 | default: /* "can't happen" */ | |
204 | return start; | |
205 | } | |
2868a2b1 | 206 | interval *= (speed == USB_SPEED_HIGH || |
8a1b2725 | 207 | speed >= USB_SPEED_SUPER) ? 125 : 1000; |
1da177e4 LT |
208 | if (interval % 1000) |
209 | unit = 'u'; | |
210 | else { | |
211 | unit = 'm'; | |
212 | interval /= 1000; | |
213 | } | |
214 | ||
215 | start += sprintf(start, format_endpt, desc->bEndpointAddress, dir, | |
216 | desc->bmAttributes, type, | |
c091b6b3 | 217 | usb_endpoint_maxp(desc) * |
376c0d3f | 218 | bandwidth, |
1da177e4 LT |
219 | interval, unit); |
220 | return start; | |
221 | } | |
222 | ||
223 | static char *usb_dump_interface_descriptor(char *start, char *end, | |
376c0d3f GKH |
224 | const struct usb_interface_cache *intfc, |
225 | const struct usb_interface *iface, | |
226 | int setno) | |
1da177e4 | 227 | { |
376c0d3f | 228 | const struct usb_interface_descriptor *desc; |
8d790d74 | 229 | const char *driver_name = ""; |
2360e4aa | 230 | int active = 0; |
1da177e4 LT |
231 | |
232 | if (start > end) | |
233 | return start; | |
376c0d3f | 234 | desc = &intfc->altsetting[setno].desc; |
2360e4aa | 235 | if (iface) { |
1da177e4 LT |
236 | driver_name = (iface->dev.driver |
237 | ? iface->dev.driver->name | |
238 | : "(none)"); | |
2360e4aa DB |
239 | active = (desc == &iface->cur_altsetting->desc); |
240 | } | |
1da177e4 | 241 | start += sprintf(start, format_iface, |
2360e4aa | 242 | active ? '*' : ' ', /* mark active altsetting */ |
1da177e4 LT |
243 | desc->bInterfaceNumber, |
244 | desc->bAlternateSetting, | |
245 | desc->bNumEndpoints, | |
246 | desc->bInterfaceClass, | |
247 | class_decode(desc->bInterfaceClass), | |
248 | desc->bInterfaceSubClass, | |
249 | desc->bInterfaceProtocol, | |
250 | driver_name); | |
1da177e4 LT |
251 | return start; |
252 | } | |
253 | ||
376c0d3f GKH |
254 | static char *usb_dump_interface(int speed, char *start, char *end, |
255 | const struct usb_interface_cache *intfc, | |
256 | const struct usb_interface *iface, int setno) | |
257 | { | |
1da177e4 LT |
258 | const struct usb_host_interface *desc = &intfc->altsetting[setno]; |
259 | int i; | |
260 | ||
261 | start = usb_dump_interface_descriptor(start, end, intfc, iface, setno); | |
262 | for (i = 0; i < desc->desc.bNumEndpoints; i++) { | |
263 | if (start > end) | |
264 | return start; | |
265 | start = usb_dump_endpoint_descriptor(speed, | |
266 | start, end, &desc->endpoint[i].desc); | |
267 | } | |
268 | return start; | |
269 | } | |
270 | ||
165fe97e | 271 | static char *usb_dump_iad_descriptor(char *start, char *end, |
376c0d3f | 272 | const struct usb_interface_assoc_descriptor *iad) |
165fe97e CN |
273 | { |
274 | if (start > end) | |
275 | return start; | |
276 | start += sprintf(start, format_iad, | |
277 | iad->bFirstInterface, | |
278 | iad->bInterfaceCount, | |
279 | iad->bFunctionClass, | |
280 | class_decode(iad->bFunctionClass), | |
281 | iad->bFunctionSubClass, | |
282 | iad->bFunctionProtocol); | |
283 | return start; | |
284 | } | |
285 | ||
1da177e4 LT |
286 | /* TBD: |
287 | * 0. TBDs | |
288 | * 1. marking active interface altsettings (code lists all, but should mark | |
289 | * which ones are active, if any) | |
290 | */ | |
376c0d3f GKH |
291 | static char *usb_dump_config_descriptor(char *start, char *end, |
292 | const struct usb_config_descriptor *desc, | |
8d8479db | 293 | int active, int speed) |
1da177e4 | 294 | { |
8d8479db SAS |
295 | int mul; |
296 | ||
1da177e4 LT |
297 | if (start > end) |
298 | return start; | |
8a1b2725 | 299 | if (speed >= USB_SPEED_SUPER) |
8d8479db SAS |
300 | mul = 8; |
301 | else | |
302 | mul = 2; | |
1da177e4 | 303 | start += sprintf(start, format_config, |
376c0d3f GKH |
304 | /* mark active/actual/current cfg. */ |
305 | active ? '*' : ' ', | |
1da177e4 LT |
306 | desc->bNumInterfaces, |
307 | desc->bConfigurationValue, | |
308 | desc->bmAttributes, | |
8d8479db | 309 | desc->bMaxPower * mul); |
1da177e4 LT |
310 | return start; |
311 | } | |
312 | ||
376c0d3f GKH |
313 | static char *usb_dump_config(int speed, char *start, char *end, |
314 | const struct usb_host_config *config, int active) | |
1da177e4 LT |
315 | { |
316 | int i, j; | |
317 | struct usb_interface_cache *intfc; | |
318 | struct usb_interface *interface; | |
319 | ||
320 | if (start > end) | |
321 | return start; | |
376c0d3f GKH |
322 | if (!config) |
323 | /* getting these some in 2.3.7; none in 2.3.6 */ | |
1da177e4 | 324 | return start + sprintf(start, "(null Cfg. desc.)\n"); |
8d8479db SAS |
325 | start = usb_dump_config_descriptor(start, end, &config->desc, active, |
326 | speed); | |
165fe97e CN |
327 | for (i = 0; i < USB_MAXIADS; i++) { |
328 | if (config->intf_assoc[i] == NULL) | |
329 | break; | |
330 | start = usb_dump_iad_descriptor(start, end, | |
331 | config->intf_assoc[i]); | |
332 | } | |
1da177e4 LT |
333 | for (i = 0; i < config->desc.bNumInterfaces; i++) { |
334 | intfc = config->intf_cache[i]; | |
335 | interface = config->interface[i]; | |
336 | for (j = 0; j < intfc->num_altsetting; j++) { | |
337 | if (start > end) | |
338 | return start; | |
339 | start = usb_dump_interface(speed, | |
340 | start, end, intfc, interface, j); | |
341 | } | |
342 | } | |
343 | return start; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Dump the different USB descriptors. | |
348 | */ | |
376c0d3f GKH |
349 | static char *usb_dump_device_descriptor(char *start, char *end, |
350 | const struct usb_device_descriptor *desc) | |
1da177e4 LT |
351 | { |
352 | u16 bcdUSB = le16_to_cpu(desc->bcdUSB); | |
353 | u16 bcdDevice = le16_to_cpu(desc->bcdDevice); | |
354 | ||
355 | if (start > end) | |
356 | return start; | |
1a68f71d | 357 | start += sprintf(start, format_device1, |
1da177e4 LT |
358 | bcdUSB >> 8, bcdUSB & 0xff, |
359 | desc->bDeviceClass, | |
376c0d3f | 360 | class_decode(desc->bDeviceClass), |
1da177e4 LT |
361 | desc->bDeviceSubClass, |
362 | desc->bDeviceProtocol, | |
363 | desc->bMaxPacketSize0, | |
364 | desc->bNumConfigurations); | |
365 | if (start > end) | |
366 | return start; | |
367 | start += sprintf(start, format_device2, | |
368 | le16_to_cpu(desc->idVendor), | |
369 | le16_to_cpu(desc->idProduct), | |
370 | bcdDevice >> 8, bcdDevice & 0xff); | |
371 | return start; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Dump the different strings that this device holds. | |
376 | */ | |
376c0d3f GKH |
377 | static char *usb_dump_device_strings(char *start, char *end, |
378 | struct usb_device *dev) | |
1da177e4 LT |
379 | { |
380 | if (start > end) | |
381 | return start; | |
382 | if (dev->manufacturer) | |
376c0d3f GKH |
383 | start += sprintf(start, format_string_manufacturer, |
384 | dev->manufacturer); | |
1da177e4 LT |
385 | if (start > end) |
386 | goto out; | |
387 | if (dev->product) | |
388 | start += sprintf(start, format_string_product, dev->product); | |
389 | if (start > end) | |
390 | goto out; | |
391 | #ifdef ALLOW_SERIAL_NUMBER | |
392 | if (dev->serial) | |
376c0d3f GKH |
393 | start += sprintf(start, format_string_serialnumber, |
394 | dev->serial); | |
1da177e4 LT |
395 | #endif |
396 | out: | |
397 | return start; | |
398 | } | |
399 | ||
400 | static char *usb_dump_desc(char *start, char *end, struct usb_device *dev) | |
401 | { | |
402 | int i; | |
403 | ||
404 | if (start > end) | |
405 | return start; | |
376c0d3f | 406 | |
1da177e4 LT |
407 | start = usb_dump_device_descriptor(start, end, &dev->descriptor); |
408 | ||
409 | if (start > end) | |
410 | return start; | |
376c0d3f | 411 | |
1a68f71d | 412 | start = usb_dump_device_strings(start, end, dev); |
1da177e4 LT |
413 | |
414 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { | |
415 | if (start > end) | |
416 | return start; | |
417 | start = usb_dump_config(dev->speed, | |
418 | start, end, dev->config + i, | |
419 | /* active ? */ | |
420 | (dev->config + i) == dev->actconfig); | |
421 | } | |
422 | return start; | |
423 | } | |
424 | ||
425 | ||
426 | #ifdef PROC_EXTRA /* TBD: may want to add this code later */ | |
427 | ||
376c0d3f GKH |
428 | static char *usb_dump_hub_descriptor(char *start, char *end, |
429 | const struct usb_hub_descriptor *desc) | |
1da177e4 LT |
430 | { |
431 | int leng = USB_DT_HUB_NONVAR_SIZE; | |
432 | unsigned char *ptr = (unsigned char *)desc; | |
433 | ||
434 | if (start > end) | |
435 | return start; | |
436 | start += sprintf(start, "Interface:"); | |
437 | while (leng && start <= end) { | |
438 | start += sprintf(start, " %02x", *ptr); | |
439 | ptr++; leng--; | |
440 | } | |
441 | *start++ = '\n'; | |
442 | return start; | |
443 | } | |
444 | ||
376c0d3f GKH |
445 | static char *usb_dump_string(char *start, char *end, |
446 | const struct usb_device *dev, char *id, int index) | |
1da177e4 LT |
447 | { |
448 | if (start > end) | |
449 | return start; | |
450 | start += sprintf(start, "Interface:"); | |
376c0d3f GKH |
451 | if (index <= dev->maxstring && dev->stringindex && |
452 | dev->stringindex[index]) | |
453 | start += sprintf(start, "%s: %.100s ", id, | |
454 | dev->stringindex[index]); | |
1da177e4 LT |
455 | return start; |
456 | } | |
457 | ||
458 | #endif /* PROC_EXTRA */ | |
459 | ||
460 | /*****************************************************************/ | |
461 | ||
462 | /* This is a recursive function. Parameters: | |
463 | * buffer - the user-space buffer to write data into | |
464 | * nbytes - the maximum number of bytes to write | |
465 | * skip_bytes - the number of bytes to skip before writing anything | |
466 | * file_offset - the offset into the devices file on completion | |
467 | * The caller must own the device lock. | |
468 | */ | |
376c0d3f GKH |
469 | static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, |
470 | loff_t *skip_bytes, loff_t *file_offset, | |
471 | struct usb_device *usbdev, struct usb_bus *bus, | |
472 | int level, int index, int count) | |
1da177e4 LT |
473 | { |
474 | int chix; | |
475 | int ret, cnt = 0; | |
476 | int parent_devnum = 0; | |
477 | char *pages_start, *data_end, *speed; | |
478 | unsigned int length; | |
479 | ssize_t total_written = 0; | |
ff823c79 | 480 | struct usb_device *childdev = NULL; |
376c0d3f | 481 | |
1da177e4 LT |
482 | /* don't bother with anything else if we're not writing any data */ |
483 | if (*nbytes <= 0) | |
484 | return 0; | |
376c0d3f | 485 | |
1da177e4 LT |
486 | if (level > MAX_TOPO_LEVEL) |
487 | return 0; | |
376c0d3f GKH |
488 | /* allocate 2^1 pages = 8K (on i386); |
489 | * should be more than enough for one device */ | |
acbe2feb | 490 | pages_start = (char *)__get_free_pages(GFP_NOIO, 1); |
376c0d3f GKH |
491 | if (!pages_start) |
492 | return -ENOMEM; | |
493 | ||
1da177e4 LT |
494 | if (usbdev->parent && usbdev->parent->devnum != -1) |
495 | parent_devnum = usbdev->parent->devnum; | |
496 | /* | |
497 | * So the root hub's parent is 0 and any device that is | |
498 | * plugged into the root hub has a parent of 0. | |
499 | */ | |
500 | switch (usbdev->speed) { | |
501 | case USB_SPEED_LOW: | |
502 | speed = "1.5"; break; | |
503 | case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */ | |
504 | case USB_SPEED_FULL: | |
834e2312 AS |
505 | speed = "12"; break; |
506 | case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */ | |
1da177e4 LT |
507 | case USB_SPEED_HIGH: |
508 | speed = "480"; break; | |
834e2312 AS |
509 | case USB_SPEED_SUPER: |
510 | speed = "5000"; break; | |
8a1b2725 MN |
511 | case USB_SPEED_SUPER_PLUS: |
512 | speed = "10000"; break; | |
1da177e4 | 513 | default: |
834e2312 | 514 | speed = "??"; |
1da177e4 LT |
515 | } |
516 | data_end = pages_start + sprintf(pages_start, format_topo, | |
517 | bus->busnum, level, parent_devnum, | |
518 | index, count, usbdev->devnum, | |
519 | speed, usbdev->maxchild); | |
520 | /* | |
521 | * level = topology-tier level; | |
522 | * parent_devnum = parent device number; | |
523 | * index = parent's connector number; | |
524 | * count = device count at this level | |
525 | */ | |
526 | /* If this is the root hub, display the bandwidth information */ | |
527 | if (level == 0) { | |
528 | int max; | |
529 | ||
2868a2b1 DT |
530 | /* super/high speed reserves 80%, full/low reserves 90% */ |
531 | if (usbdev->speed == USB_SPEED_HIGH || | |
8a1b2725 | 532 | usbdev->speed >= USB_SPEED_SUPER) |
1da177e4 LT |
533 | max = 800; |
534 | else | |
535 | max = FRAME_TIME_MAX_USECS_ALLOC; | |
536 | ||
537 | /* report "average" periodic allocation over a microsecond. | |
538 | * the schedules are actually bursty, HCDs need to deal with | |
539 | * that and just compute/report this average. | |
540 | */ | |
541 | data_end += sprintf(data_end, format_bandwidth, | |
542 | bus->bandwidth_allocated, max, | |
543 | (100 * bus->bandwidth_allocated + max / 2) | |
544 | / max, | |
376c0d3f GKH |
545 | bus->bandwidth_int_reqs, |
546 | bus->bandwidth_isoc_reqs); | |
547 | ||
1da177e4 | 548 | } |
376c0d3f GKH |
549 | data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256, |
550 | usbdev); | |
551 | ||
1da177e4 LT |
552 | if (data_end > (pages_start + (2 * PAGE_SIZE) - 256)) |
553 | data_end += sprintf(data_end, "(truncated)\n"); | |
376c0d3f | 554 | |
1da177e4 LT |
555 | length = data_end - pages_start; |
556 | /* if we can start copying some data to the user */ | |
557 | if (length > *skip_bytes) { | |
558 | length -= *skip_bytes; | |
559 | if (length > *nbytes) | |
560 | length = *nbytes; | |
561 | if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) { | |
562 | free_pages((unsigned long)pages_start, 1); | |
563 | return -EFAULT; | |
564 | } | |
565 | *nbytes -= length; | |
566 | *file_offset += length; | |
567 | total_written += length; | |
568 | *buffer += length; | |
569 | *skip_bytes = 0; | |
570 | } else | |
571 | *skip_bytes -= length; | |
376c0d3f | 572 | |
1da177e4 | 573 | free_pages((unsigned long)pages_start, 1); |
376c0d3f | 574 | |
1da177e4 | 575 | /* Now look at all of this device's children. */ |
ff823c79 | 576 | usb_hub_for_each_child(usbdev, chix, childdev) { |
969ddcfc AS |
577 | usb_lock_device(childdev); |
578 | ret = usb_device_dump(buffer, nbytes, skip_bytes, | |
579 | file_offset, childdev, bus, | |
580 | level + 1, chix - 1, ++cnt); | |
581 | usb_unlock_device(childdev); | |
582 | if (ret == -EFAULT) | |
583 | return total_written; | |
584 | total_written += ret; | |
1da177e4 LT |
585 | } |
586 | return total_written; | |
587 | } | |
588 | ||
376c0d3f GKH |
589 | static ssize_t usb_device_read(struct file *file, char __user *buf, |
590 | size_t nbytes, loff_t *ppos) | |
1da177e4 LT |
591 | { |
592 | struct usb_bus *bus; | |
593 | ssize_t ret, total_written = 0; | |
594 | loff_t skip_bytes = *ppos; | |
5363de75 | 595 | int id; |
1da177e4 LT |
596 | |
597 | if (*ppos < 0) | |
598 | return -EINVAL; | |
599 | if (nbytes <= 0) | |
600 | return 0; | |
601 | if (!access_ok(VERIFY_WRITE, buf, nbytes)) | |
602 | return -EFAULT; | |
603 | ||
a4b5d606 | 604 | mutex_lock(&usb_bus_idr_lock); |
1da177e4 | 605 | /* print devices for all busses */ |
5363de75 | 606 | idr_for_each_entry(&usb_bus_idr, bus, id) { |
1da177e4 | 607 | /* recurse through all children of the root hub */ |
0a231403 | 608 | if (!bus_to_hcd(bus)->rh_registered) |
1da177e4 LT |
609 | continue; |
610 | usb_lock_device(bus->root_hub); | |
376c0d3f GKH |
611 | ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos, |
612 | bus->root_hub, bus, 0, 0, 0); | |
1da177e4 LT |
613 | usb_unlock_device(bus->root_hub); |
614 | if (ret < 0) { | |
a4b5d606 | 615 | mutex_unlock(&usb_bus_idr_lock); |
1da177e4 LT |
616 | return ret; |
617 | } | |
618 | total_written += ret; | |
619 | } | |
a4b5d606 | 620 | mutex_unlock(&usb_bus_idr_lock); |
1da177e4 LT |
621 | return total_written; |
622 | } | |
623 | ||
624 | /* Kernel lock for "lastev" protection */ | |
afc9a42b | 625 | static __poll_t usb_device_poll(struct file *file, |
376c0d3f | 626 | struct poll_table_struct *wait) |
1da177e4 | 627 | { |
7bc80cd9 | 628 | unsigned int event_count; |
554f7696 | 629 | |
7bc80cd9 | 630 | poll_wait(file, &device_event.wait, wait); |
1da177e4 | 631 | |
7bc80cd9 LT |
632 | event_count = atomic_read(&device_event.count); |
633 | if (file->f_version != event_count) { | |
634 | file->f_version = event_count; | |
a9a08845 | 635 | return EPOLLIN | EPOLLRDNORM; |
7bc80cd9 | 636 | } |
1da177e4 | 637 | |
376c0d3f | 638 | return 0; |
1da177e4 LT |
639 | } |
640 | ||
066202dd | 641 | const struct file_operations usbfs_devices_fops = { |
b25472f9 | 642 | .llseek = no_seek_end_llseek, |
1da177e4 LT |
643 | .read = usb_device_read, |
644 | .poll = usb_device_poll, | |
1da177e4 | 645 | }; |