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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * devices.c
4 * (C) Copyright 1999 Randy Dunlap.
5 * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>.
6 * (proc file per device)
7 * (C) Copyright 1999 Deti Fliegl (new USB architecture)
8 *
9 *************************************************************
10 *
11 * <mountpoint>/devices contains USB topology, device, config, class,
12 * interface, & endpoint data.
13 *
14 * I considered using /dev/bus/usb/device# for each device
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.
30 * Added a poll method to /sys/kernel/debug/usb/devices, to wake
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
37 */
38
39#include <linux/fs.h>
40#include <linux/mm.h>
41#include <linux/gfp.h>
42#include <linux/poll.h>
43#include <linux/usb.h>
44#include <linux/usbdevice_fs.h>
45#include <linux/usb/hcd.h>
46#include <linux/mutex.h>
47#include <linux/uaccess.h>
48
49#include "usb.h"
50
51/* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */
52#define ALLOW_SERIAL_NUMBER
53
54static const char format_topo[] =
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";
57
58static const char format_string_manufacturer[] =
59/* S: Manufacturer=xxxx */
60 "S: Manufacturer=%.100s\n";
61
62static const char format_string_product[] =
63/* S: Product=xxxx */
64 "S: Product=%.100s\n";
65
66#ifdef ALLOW_SERIAL_NUMBER
67static const char format_string_serialnumber[] =
68/* S: SerialNumber=xxxx */
69 "S: SerialNumber=%.100s\n";
70#endif
71
72static const char format_bandwidth[] =
73/* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */
74 "B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n";
75
76static const char format_device1[] =
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
80static const char format_device2[] =
81/* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */
82 "P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n";
83
84static const char format_config[] =
85/* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */
86 "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n";
87
88static const char format_iad[] =
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
92static const char format_iface[] =
93/* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/
94 "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n";
95
96static const char format_endpt[] =
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
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 */
108static 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};
115
116struct class_info {
117 int class;
118 char *class_name;
119};
120
121static const struct class_info clas_info[] = {
122 /* max. 5 chars. per name string */
123 {USB_CLASS_PER_INTERFACE, ">ifc"},
124 {USB_CLASS_AUDIO, "audio"},
125 {USB_CLASS_COMM, "comm."},
126 {USB_CLASS_HID, "HID"},
127 {USB_CLASS_PHYSICAL, "PID"},
128 {USB_CLASS_STILL_IMAGE, "still"},
129 {USB_CLASS_PRINTER, "print"},
130 {USB_CLASS_MASS_STORAGE, "stor."},
131 {USB_CLASS_HUB, "hub"},
132 {USB_CLASS_CDC_DATA, "data"},
133 {USB_CLASS_CSCID, "scard"},
134 {USB_CLASS_CONTENT_SEC, "c-sec"},
135 {USB_CLASS_VIDEO, "video"},
136 {USB_CLASS_PERSONAL_HEALTHCARE, "perhc"},
137 {USB_CLASS_AUDIO_VIDEO, "av"},
138 {USB_CLASS_BILLBOARD, "blbrd"},
139 {USB_CLASS_USB_TYPE_C_BRIDGE, "bridg"},
140 {USB_CLASS_WIRELESS_CONTROLLER, "wlcon"},
141 {USB_CLASS_MISC, "misc"},
142 {USB_CLASS_APP_SPEC, "app."},
143 {USB_CLASS_VENDOR_SPEC, "vend."},
144 {-1, "unk."} /* leave as last */
145};
146
147/*****************************************************************/
148
149void usbfs_conn_disc_event(void)
150{
151 atomic_add(2, &device_event.count);
152 wake_up(&device_event.wait);
153}
154
155static const char *class_decode(const int class)
156{
157 int ix;
158
159 for (ix = 0; clas_info[ix].class != -1; ix++)
160 if (clas_info[ix].class == class)
161 break;
162 return clas_info[ix].class_name;
163}
164
165static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
166 const struct usb_endpoint_descriptor *desc)
167{
168 char dir, unit, *type;
169 unsigned interval, bandwidth = 1;
170
171 if (start > end)
172 return start;
173
174 dir = usb_endpoint_dir_in(desc) ? 'I' : 'O';
175
176 if (speed == USB_SPEED_HIGH)
177 bandwidth = usb_endpoint_maxp_mult(desc);
178
179 /* this isn't checking for illegal values */
180 switch (usb_endpoint_type(desc)) {
181 case USB_ENDPOINT_XFER_CONTROL:
182 type = "Ctrl";
183 if (speed == USB_SPEED_HIGH) /* uframes per NAK */
184 interval = desc->bInterval;
185 else
186 interval = 0;
187 dir = 'B'; /* ctrl is bidirectional */
188 break;
189 case USB_ENDPOINT_XFER_ISOC:
190 type = "Isoc";
191 interval = 1 << (desc->bInterval - 1);
192 break;
193 case USB_ENDPOINT_XFER_BULK:
194 type = "Bulk";
195 if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */
196 interval = desc->bInterval;
197 else
198 interval = 0;
199 break;
200 case USB_ENDPOINT_XFER_INT:
201 type = "Int.";
202 if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER)
203 interval = 1 << (desc->bInterval - 1);
204 else
205 interval = desc->bInterval;
206 break;
207 default: /* "can't happen" */
208 return start;
209 }
210 interval *= (speed == USB_SPEED_HIGH ||
211 speed >= USB_SPEED_SUPER) ? 125 : 1000;
212 if (interval % 1000)
213 unit = 'u';
214 else {
215 unit = 'm';
216 interval /= 1000;
217 }
218
219 start += sprintf(start, format_endpt, desc->bEndpointAddress, dir,
220 desc->bmAttributes, type,
221 usb_endpoint_maxp(desc) *
222 bandwidth,
223 interval, unit);
224 return start;
225}
226
227static char *usb_dump_interface_descriptor(char *start, char *end,
228 const struct usb_interface_cache *intfc,
229 const struct usb_interface *iface,
230 int setno)
231{
232 const struct usb_interface_descriptor *desc;
233 const char *driver_name = "";
234 int active = 0;
235
236 if (start > end)
237 return start;
238 desc = &intfc->altsetting[setno].desc;
239 if (iface) {
240 driver_name = (iface->dev.driver
241 ? iface->dev.driver->name
242 : "(none)");
243 active = (desc == &iface->cur_altsetting->desc);
244 }
245 start += sprintf(start, format_iface,
246 active ? '*' : ' ', /* mark active altsetting */
247 desc->bInterfaceNumber,
248 desc->bAlternateSetting,
249 desc->bNumEndpoints,
250 desc->bInterfaceClass,
251 class_decode(desc->bInterfaceClass),
252 desc->bInterfaceSubClass,
253 desc->bInterfaceProtocol,
254 driver_name);
255 return start;
256}
257
258static char *usb_dump_interface(int speed, char *start, char *end,
259 const struct usb_interface_cache *intfc,
260 const struct usb_interface *iface, int setno)
261{
262 const struct usb_host_interface *desc = &intfc->altsetting[setno];
263 int i;
264
265 start = usb_dump_interface_descriptor(start, end, intfc, iface, setno);
266 for (i = 0; i < desc->desc.bNumEndpoints; i++) {
267 if (start > end)
268 return start;
269 start = usb_dump_endpoint_descriptor(speed,
270 start, end, &desc->endpoint[i].desc);
271 }
272 return start;
273}
274
275static char *usb_dump_iad_descriptor(char *start, char *end,
276 const struct usb_interface_assoc_descriptor *iad)
277{
278 if (start > end)
279 return start;
280 start += sprintf(start, format_iad,
281 iad->bFirstInterface,
282 iad->bInterfaceCount,
283 iad->bFunctionClass,
284 class_decode(iad->bFunctionClass),
285 iad->bFunctionSubClass,
286 iad->bFunctionProtocol);
287 return start;
288}
289
290/* TBD:
291 * 0. TBDs
292 * 1. marking active interface altsettings (code lists all, but should mark
293 * which ones are active, if any)
294 */
295static char *usb_dump_config_descriptor(char *start, char *end,
296 const struct usb_config_descriptor *desc,
297 int active, int speed)
298{
299 int mul;
300
301 if (start > end)
302 return start;
303 if (speed >= USB_SPEED_SUPER)
304 mul = 8;
305 else
306 mul = 2;
307 start += sprintf(start, format_config,
308 /* mark active/actual/current cfg. */
309 active ? '*' : ' ',
310 desc->bNumInterfaces,
311 desc->bConfigurationValue,
312 desc->bmAttributes,
313 desc->bMaxPower * mul);
314 return start;
315}
316
317static char *usb_dump_config(int speed, char *start, char *end,
318 const struct usb_host_config *config, int active)
319{
320 int i, j;
321 struct usb_interface_cache *intfc;
322 struct usb_interface *interface;
323
324 if (start > end)
325 return start;
326 if (!config)
327 /* getting these some in 2.3.7; none in 2.3.6 */
328 return start + sprintf(start, "(null Cfg. desc.)\n");
329 start = usb_dump_config_descriptor(start, end, &config->desc, active,
330 speed);
331 for (i = 0; i < USB_MAXIADS; i++) {
332 if (config->intf_assoc[i] == NULL)
333 break;
334 start = usb_dump_iad_descriptor(start, end,
335 config->intf_assoc[i]);
336 }
337 for (i = 0; i < config->desc.bNumInterfaces; i++) {
338 intfc = config->intf_cache[i];
339 interface = config->interface[i];
340 for (j = 0; j < intfc->num_altsetting; j++) {
341 if (start > end)
342 return start;
343 start = usb_dump_interface(speed,
344 start, end, intfc, interface, j);
345 }
346 }
347 return start;
348}
349
350/*
351 * Dump the different USB descriptors.
352 */
353static char *usb_dump_device_descriptor(char *start, char *end,
354 const struct usb_device_descriptor *desc)
355{
356 u16 bcdUSB = le16_to_cpu(desc->bcdUSB);
357 u16 bcdDevice = le16_to_cpu(desc->bcdDevice);
358
359 if (start > end)
360 return start;
361 start += sprintf(start, format_device1,
362 bcdUSB >> 8, bcdUSB & 0xff,
363 desc->bDeviceClass,
364 class_decode(desc->bDeviceClass),
365 desc->bDeviceSubClass,
366 desc->bDeviceProtocol,
367 desc->bMaxPacketSize0,
368 desc->bNumConfigurations);
369 if (start > end)
370 return start;
371 start += sprintf(start, format_device2,
372 le16_to_cpu(desc->idVendor),
373 le16_to_cpu(desc->idProduct),
374 bcdDevice >> 8, bcdDevice & 0xff);
375 return start;
376}
377
378/*
379 * Dump the different strings that this device holds.
380 */
381static char *usb_dump_device_strings(char *start, char *end,
382 struct usb_device *dev)
383{
384 if (start > end)
385 return start;
386 if (dev->manufacturer)
387 start += sprintf(start, format_string_manufacturer,
388 dev->manufacturer);
389 if (start > end)
390 goto out;
391 if (dev->product)
392 start += sprintf(start, format_string_product, dev->product);
393 if (start > end)
394 goto out;
395#ifdef ALLOW_SERIAL_NUMBER
396 if (dev->serial)
397 start += sprintf(start, format_string_serialnumber,
398 dev->serial);
399#endif
400 out:
401 return start;
402}
403
404static char *usb_dump_desc(char *start, char *end, struct usb_device *dev)
405{
406 int i;
407
408 if (start > end)
409 return start;
410
411 start = usb_dump_device_descriptor(start, end, &dev->descriptor);
412
413 if (start > end)
414 return start;
415
416 start = usb_dump_device_strings(start, end, dev);
417
418 for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {
419 if (start > end)
420 return start;
421 start = usb_dump_config(dev->speed,
422 start, end, dev->config + i,
423 /* active ? */
424 (dev->config + i) == dev->actconfig);
425 }
426 return start;
427}
428
429
430#ifdef PROC_EXTRA /* TBD: may want to add this code later */
431
432static char *usb_dump_hub_descriptor(char *start, char *end,
433 const struct usb_hub_descriptor *desc)
434{
435 int leng = USB_DT_HUB_NONVAR_SIZE;
436 unsigned char *ptr = (unsigned char *)desc;
437
438 if (start > end)
439 return start;
440 start += sprintf(start, "Interface:");
441 while (leng && start <= end) {
442 start += sprintf(start, " %02x", *ptr);
443 ptr++; leng--;
444 }
445 *start++ = '\n';
446 return start;
447}
448
449static char *usb_dump_string(char *start, char *end,
450 const struct usb_device *dev, char *id, int index)
451{
452 if (start > end)
453 return start;
454 start += sprintf(start, "Interface:");
455 if (index <= dev->maxstring && dev->stringindex &&
456 dev->stringindex[index])
457 start += sprintf(start, "%s: %.100s ", id,
458 dev->stringindex[index]);
459 return start;
460}
461
462#endif /* PROC_EXTRA */
463
464/*****************************************************************/
465
466/* This is a recursive function. Parameters:
467 * buffer - the user-space buffer to write data into
468 * nbytes - the maximum number of bytes to write
469 * skip_bytes - the number of bytes to skip before writing anything
470 * file_offset - the offset into the devices file on completion
471 * The caller must own the device lock.
472 */
473static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
474 loff_t *skip_bytes, loff_t *file_offset,
475 struct usb_device *usbdev, struct usb_bus *bus,
476 int level, int index, int count)
477{
478 int chix;
479 int ret, cnt = 0;
480 int parent_devnum = 0;
481 char *pages_start, *data_end, *speed;
482 unsigned int length;
483 ssize_t total_written = 0;
484 struct usb_device *childdev = NULL;
485
486 /* don't bother with anything else if we're not writing any data */
487 if (*nbytes <= 0)
488 return 0;
489
490 if (level > MAX_TOPO_LEVEL)
491 return 0;
492 /* allocate 2^1 pages = 8K (on i386);
493 * should be more than enough for one device */
494 pages_start = (char *)__get_free_pages(GFP_NOIO, 1);
495 if (!pages_start)
496 return -ENOMEM;
497
498 if (usbdev->parent && usbdev->parent->devnum != -1)
499 parent_devnum = usbdev->parent->devnum;
500 /*
501 * So the root hub's parent is 0 and any device that is
502 * plugged into the root hub has a parent of 0.
503 */
504 switch (usbdev->speed) {
505 case USB_SPEED_LOW:
506 speed = "1.5"; break;
507 case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */
508 case USB_SPEED_FULL:
509 speed = "12"; break;
510 case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */
511 case USB_SPEED_HIGH:
512 speed = "480"; break;
513 case USB_SPEED_SUPER:
514 speed = "5000"; break;
515 case USB_SPEED_SUPER_PLUS:
516 speed = "10000"; break;
517 default:
518 speed = "??";
519 }
520 data_end = pages_start + sprintf(pages_start, format_topo,
521 bus->busnum, level, parent_devnum,
522 index, count, usbdev->devnum,
523 speed, usbdev->maxchild);
524 /*
525 * level = topology-tier level;
526 * parent_devnum = parent device number;
527 * index = parent's connector number;
528 * count = device count at this level
529 */
530 /* If this is the root hub, display the bandwidth information */
531 if (level == 0) {
532 int max;
533
534 /* super/high speed reserves 80%, full/low reserves 90% */
535 if (usbdev->speed == USB_SPEED_HIGH ||
536 usbdev->speed >= USB_SPEED_SUPER)
537 max = 800;
538 else
539 max = FRAME_TIME_MAX_USECS_ALLOC;
540
541 /* report "average" periodic allocation over a microsecond.
542 * the schedules are actually bursty, HCDs need to deal with
543 * that and just compute/report this average.
544 */
545 data_end += sprintf(data_end, format_bandwidth,
546 bus->bandwidth_allocated, max,
547 (100 * bus->bandwidth_allocated + max / 2)
548 / max,
549 bus->bandwidth_int_reqs,
550 bus->bandwidth_isoc_reqs);
551
552 }
553 data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256,
554 usbdev);
555
556 if (data_end > (pages_start + (2 * PAGE_SIZE) - 256))
557 data_end += sprintf(data_end, "(truncated)\n");
558
559 length = data_end - pages_start;
560 /* if we can start copying some data to the user */
561 if (length > *skip_bytes) {
562 length -= *skip_bytes;
563 if (length > *nbytes)
564 length = *nbytes;
565 if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) {
566 free_pages((unsigned long)pages_start, 1);
567 return -EFAULT;
568 }
569 *nbytes -= length;
570 *file_offset += length;
571 total_written += length;
572 *buffer += length;
573 *skip_bytes = 0;
574 } else
575 *skip_bytes -= length;
576
577 free_pages((unsigned long)pages_start, 1);
578
579 /* Now look at all of this device's children. */
580 usb_hub_for_each_child(usbdev, chix, childdev) {
581 usb_lock_device(childdev);
582 ret = usb_device_dump(buffer, nbytes, skip_bytes,
583 file_offset, childdev, bus,
584 level + 1, chix - 1, ++cnt);
585 usb_unlock_device(childdev);
586 if (ret == -EFAULT)
587 return total_written;
588 total_written += ret;
589 }
590 return total_written;
591}
592
593static ssize_t usb_device_read(struct file *file, char __user *buf,
594 size_t nbytes, loff_t *ppos)
595{
596 struct usb_bus *bus;
597 ssize_t ret, total_written = 0;
598 loff_t skip_bytes = *ppos;
599 int id;
600
601 if (*ppos < 0)
602 return -EINVAL;
603 if (nbytes <= 0)
604 return 0;
605
606 mutex_lock(&usb_bus_idr_lock);
607 /* print devices for all busses */
608 idr_for_each_entry(&usb_bus_idr, bus, id) {
609 /* recurse through all children of the root hub */
610 if (!bus_to_hcd(bus)->rh_registered)
611 continue;
612 usb_lock_device(bus->root_hub);
613 ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos,
614 bus->root_hub, bus, 0, 0, 0);
615 usb_unlock_device(bus->root_hub);
616 if (ret < 0) {
617 mutex_unlock(&usb_bus_idr_lock);
618 return ret;
619 }
620 total_written += ret;
621 }
622 mutex_unlock(&usb_bus_idr_lock);
623 return total_written;
624}
625
626/* Kernel lock for "lastev" protection */
627static __poll_t usb_device_poll(struct file *file,
628 struct poll_table_struct *wait)
629{
630 unsigned int event_count;
631
632 poll_wait(file, &device_event.wait, wait);
633
634 event_count = atomic_read(&device_event.count);
635 if (file->f_version != event_count) {
636 file->f_version = event_count;
637 return EPOLLIN | EPOLLRDNORM;
638 }
639
640 return 0;
641}
642
643const struct file_operations usbfs_devices_fops = {
644 .llseek = no_seek_end_llseek,
645 .read = usb_device_read,
646 .poll = usb_device_poll,
647};
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * devices.c
4 * (C) Copyright 1999 Randy Dunlap.
5 * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>.
6 * (proc file per device)
7 * (C) Copyright 1999 Deti Fliegl (new USB architecture)
8 *
9 *************************************************************
10 *
11 * <mountpoint>/devices contains USB topology, device, config, class,
12 * interface, & endpoint data.
13 *
14 * I considered using /dev/bus/usb/device# for each device
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.
30 * Added a poll method to /sys/kernel/debug/usb/devices, to wake
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
37 */
38
39#include <linux/fs.h>
40#include <linux/mm.h>
41#include <linux/gfp.h>
42#include <linux/usb.h>
43#include <linux/usbdevice_fs.h>
44#include <linux/usb/hcd.h>
45#include <linux/mutex.h>
46#include <linux/uaccess.h>
47
48#include "usb.h"
49
50/* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */
51#define ALLOW_SERIAL_NUMBER
52
53static const char format_topo[] =
54/* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd */
55"\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%-4s MxCh=%2d\n";
56
57static const char format_string_manufacturer[] =
58/* S: Manufacturer=xxxx */
59 "S: Manufacturer=%.100s\n";
60
61static const char format_string_product[] =
62/* S: Product=xxxx */
63 "S: Product=%.100s\n";
64
65#ifdef ALLOW_SERIAL_NUMBER
66static const char format_string_serialnumber[] =
67/* S: SerialNumber=xxxx */
68 "S: SerialNumber=%.100s\n";
69#endif
70
71static const char format_bandwidth[] =
72/* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */
73 "B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n";
74
75static const char format_device1[] =
76/* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */
77 "D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n";
78
79static const char format_device2[] =
80/* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */
81 "P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n";
82
83static const char format_config[] =
84/* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */
85 "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n";
86
87static const char format_iad[] =
88/* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */
89 "A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n";
90
91static const char format_iface[] =
92/* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/
93 "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n";
94
95static const char format_endpt[] =
96/* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */
97 "E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n";
98
99struct class_info {
100 int class;
101 char *class_name;
102};
103
104static const struct class_info clas_info[] = {
105 /* max. 5 chars. per name string */
106 {USB_CLASS_PER_INTERFACE, ">ifc"},
107 {USB_CLASS_AUDIO, "audio"},
108 {USB_CLASS_COMM, "comm."},
109 {USB_CLASS_HID, "HID"},
110 {USB_CLASS_PHYSICAL, "PID"},
111 {USB_CLASS_STILL_IMAGE, "still"},
112 {USB_CLASS_PRINTER, "print"},
113 {USB_CLASS_MASS_STORAGE, "stor."},
114 {USB_CLASS_HUB, "hub"},
115 {USB_CLASS_CDC_DATA, "data"},
116 {USB_CLASS_CSCID, "scard"},
117 {USB_CLASS_CONTENT_SEC, "c-sec"},
118 {USB_CLASS_VIDEO, "video"},
119 {USB_CLASS_PERSONAL_HEALTHCARE, "perhc"},
120 {USB_CLASS_AUDIO_VIDEO, "av"},
121 {USB_CLASS_BILLBOARD, "blbrd"},
122 {USB_CLASS_USB_TYPE_C_BRIDGE, "bridg"},
123 {USB_CLASS_WIRELESS_CONTROLLER, "wlcon"},
124 {USB_CLASS_MISC, "misc"},
125 {USB_CLASS_APP_SPEC, "app."},
126 {USB_CLASS_VENDOR_SPEC, "vend."},
127 {-1, "unk."} /* leave as last */
128};
129
130/*****************************************************************/
131
132static const char *class_decode(const int class)
133{
134 int ix;
135
136 for (ix = 0; clas_info[ix].class != -1; ix++)
137 if (clas_info[ix].class == class)
138 break;
139 return clas_info[ix].class_name;
140}
141
142static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
143 const struct usb_endpoint_descriptor *desc)
144{
145 char dir, unit, *type;
146 unsigned interval, bandwidth = 1;
147
148 if (start > end)
149 return start;
150
151 dir = usb_endpoint_dir_in(desc) ? 'I' : 'O';
152
153 if (speed == USB_SPEED_HIGH)
154 bandwidth = usb_endpoint_maxp_mult(desc);
155
156 /* this isn't checking for illegal values */
157 switch (usb_endpoint_type(desc)) {
158 case USB_ENDPOINT_XFER_CONTROL:
159 type = "Ctrl";
160 dir = 'B'; /* ctrl is bidirectional */
161 break;
162 case USB_ENDPOINT_XFER_ISOC:
163 type = "Isoc";
164 break;
165 case USB_ENDPOINT_XFER_BULK:
166 type = "Bulk";
167 break;
168 case USB_ENDPOINT_XFER_INT:
169 type = "Int.";
170 break;
171 default: /* "can't happen" */
172 return start;
173 }
174
175 interval = usb_decode_interval(desc, speed);
176 if (interval % 1000) {
177 unit = 'u';
178 } else {
179 unit = 'm';
180 interval /= 1000;
181 }
182
183 start += sprintf(start, format_endpt, desc->bEndpointAddress, dir,
184 desc->bmAttributes, type,
185 usb_endpoint_maxp(desc) *
186 bandwidth,
187 interval, unit);
188 return start;
189}
190
191static char *usb_dump_interface_descriptor(char *start, char *end,
192 const struct usb_interface_cache *intfc,
193 const struct usb_interface *iface,
194 int setno)
195{
196 const struct usb_interface_descriptor *desc;
197 const char *driver_name = "";
198 int active = 0;
199
200 if (start > end)
201 return start;
202 desc = &intfc->altsetting[setno].desc;
203 if (iface) {
204 driver_name = (iface->dev.driver
205 ? iface->dev.driver->name
206 : "(none)");
207 active = (desc == &iface->cur_altsetting->desc);
208 }
209 start += sprintf(start, format_iface,
210 active ? '*' : ' ', /* mark active altsetting */
211 desc->bInterfaceNumber,
212 desc->bAlternateSetting,
213 desc->bNumEndpoints,
214 desc->bInterfaceClass,
215 class_decode(desc->bInterfaceClass),
216 desc->bInterfaceSubClass,
217 desc->bInterfaceProtocol,
218 driver_name);
219 return start;
220}
221
222static char *usb_dump_interface(int speed, char *start, char *end,
223 const struct usb_interface_cache *intfc,
224 const struct usb_interface *iface, int setno)
225{
226 const struct usb_host_interface *desc = &intfc->altsetting[setno];
227 int i;
228
229 start = usb_dump_interface_descriptor(start, end, intfc, iface, setno);
230 for (i = 0; i < desc->desc.bNumEndpoints; i++) {
231 if (start > end)
232 return start;
233 start = usb_dump_endpoint_descriptor(speed,
234 start, end, &desc->endpoint[i].desc);
235 }
236 return start;
237}
238
239static char *usb_dump_iad_descriptor(char *start, char *end,
240 const struct usb_interface_assoc_descriptor *iad)
241{
242 if (start > end)
243 return start;
244 start += sprintf(start, format_iad,
245 iad->bFirstInterface,
246 iad->bInterfaceCount,
247 iad->bFunctionClass,
248 class_decode(iad->bFunctionClass),
249 iad->bFunctionSubClass,
250 iad->bFunctionProtocol);
251 return start;
252}
253
254/* TBD:
255 * 0. TBDs
256 * 1. marking active interface altsettings (code lists all, but should mark
257 * which ones are active, if any)
258 */
259static char *usb_dump_config_descriptor(char *start, char *end,
260 const struct usb_config_descriptor *desc,
261 int active, int speed)
262{
263 int mul;
264
265 if (start > end)
266 return start;
267 if (speed >= USB_SPEED_SUPER)
268 mul = 8;
269 else
270 mul = 2;
271 start += sprintf(start, format_config,
272 /* mark active/actual/current cfg. */
273 active ? '*' : ' ',
274 desc->bNumInterfaces,
275 desc->bConfigurationValue,
276 desc->bmAttributes,
277 desc->bMaxPower * mul);
278 return start;
279}
280
281static char *usb_dump_config(int speed, char *start, char *end,
282 const struct usb_host_config *config, int active)
283{
284 int i, j;
285 struct usb_interface_cache *intfc;
286 struct usb_interface *interface;
287
288 if (start > end)
289 return start;
290 if (!config)
291 /* getting these some in 2.3.7; none in 2.3.6 */
292 return start + sprintf(start, "(null Cfg. desc.)\n");
293 start = usb_dump_config_descriptor(start, end, &config->desc, active,
294 speed);
295 for (i = 0; i < USB_MAXIADS; i++) {
296 if (config->intf_assoc[i] == NULL)
297 break;
298 start = usb_dump_iad_descriptor(start, end,
299 config->intf_assoc[i]);
300 }
301 for (i = 0; i < config->desc.bNumInterfaces; i++) {
302 intfc = config->intf_cache[i];
303 interface = config->interface[i];
304 for (j = 0; j < intfc->num_altsetting; j++) {
305 if (start > end)
306 return start;
307 start = usb_dump_interface(speed,
308 start, end, intfc, interface, j);
309 }
310 }
311 return start;
312}
313
314/*
315 * Dump the different USB descriptors.
316 */
317static char *usb_dump_device_descriptor(char *start, char *end,
318 const struct usb_device_descriptor *desc)
319{
320 u16 bcdUSB = le16_to_cpu(desc->bcdUSB);
321 u16 bcdDevice = le16_to_cpu(desc->bcdDevice);
322
323 if (start > end)
324 return start;
325 start += sprintf(start, format_device1,
326 bcdUSB >> 8, bcdUSB & 0xff,
327 desc->bDeviceClass,
328 class_decode(desc->bDeviceClass),
329 desc->bDeviceSubClass,
330 desc->bDeviceProtocol,
331 desc->bMaxPacketSize0,
332 desc->bNumConfigurations);
333 if (start > end)
334 return start;
335 start += sprintf(start, format_device2,
336 le16_to_cpu(desc->idVendor),
337 le16_to_cpu(desc->idProduct),
338 bcdDevice >> 8, bcdDevice & 0xff);
339 return start;
340}
341
342/*
343 * Dump the different strings that this device holds.
344 */
345static char *usb_dump_device_strings(char *start, char *end,
346 struct usb_device *dev)
347{
348 if (start > end)
349 return start;
350 if (dev->manufacturer)
351 start += sprintf(start, format_string_manufacturer,
352 dev->manufacturer);
353 if (start > end)
354 goto out;
355 if (dev->product)
356 start += sprintf(start, format_string_product, dev->product);
357 if (start > end)
358 goto out;
359#ifdef ALLOW_SERIAL_NUMBER
360 if (dev->serial)
361 start += sprintf(start, format_string_serialnumber,
362 dev->serial);
363#endif
364 out:
365 return start;
366}
367
368static char *usb_dump_desc(char *start, char *end, struct usb_device *dev)
369{
370 int i;
371
372 if (start > end)
373 return start;
374
375 start = usb_dump_device_descriptor(start, end, &dev->descriptor);
376
377 if (start > end)
378 return start;
379
380 start = usb_dump_device_strings(start, end, dev);
381
382 for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {
383 if (start > end)
384 return start;
385 start = usb_dump_config(dev->speed,
386 start, end, dev->config + i,
387 /* active ? */
388 (dev->config + i) == dev->actconfig);
389 }
390 return start;
391}
392
393
394#ifdef PROC_EXTRA /* TBD: may want to add this code later */
395
396static char *usb_dump_hub_descriptor(char *start, char *end,
397 const struct usb_hub_descriptor *desc)
398{
399 int leng = USB_DT_HUB_NONVAR_SIZE;
400 unsigned char *ptr = (unsigned char *)desc;
401
402 if (start > end)
403 return start;
404 start += sprintf(start, "Interface:");
405 while (leng && start <= end) {
406 start += sprintf(start, " %02x", *ptr);
407 ptr++; leng--;
408 }
409 *start++ = '\n';
410 return start;
411}
412
413static char *usb_dump_string(char *start, char *end,
414 const struct usb_device *dev, char *id, int index)
415{
416 if (start > end)
417 return start;
418 start += sprintf(start, "Interface:");
419 if (index <= dev->maxstring && dev->stringindex &&
420 dev->stringindex[index])
421 start += sprintf(start, "%s: %.100s ", id,
422 dev->stringindex[index]);
423 return start;
424}
425
426#endif /* PROC_EXTRA */
427
428/*****************************************************************/
429
430/* This is a recursive function. Parameters:
431 * buffer - the user-space buffer to write data into
432 * nbytes - the maximum number of bytes to write
433 * skip_bytes - the number of bytes to skip before writing anything
434 * file_offset - the offset into the devices file on completion
435 * The caller must own the device lock.
436 */
437static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
438 loff_t *skip_bytes, loff_t *file_offset,
439 struct usb_device *usbdev, struct usb_bus *bus,
440 int level, int index, int count)
441{
442 int chix;
443 int ret, cnt = 0;
444 int parent_devnum = 0;
445 char *pages_start, *data_end, *speed;
446 unsigned int length;
447 ssize_t total_written = 0;
448 struct usb_device *childdev = NULL;
449
450 /* don't bother with anything else if we're not writing any data */
451 if (*nbytes <= 0)
452 return 0;
453
454 if (level > MAX_TOPO_LEVEL)
455 return 0;
456 /* allocate 2^1 pages = 8K (on i386);
457 * should be more than enough for one device */
458 pages_start = (char *)__get_free_pages(GFP_NOIO, 1);
459 if (!pages_start)
460 return -ENOMEM;
461
462 if (usbdev->parent && usbdev->parent->devnum != -1)
463 parent_devnum = usbdev->parent->devnum;
464 /*
465 * So the root hub's parent is 0 and any device that is
466 * plugged into the root hub has a parent of 0.
467 */
468 switch (usbdev->speed) {
469 case USB_SPEED_LOW:
470 speed = "1.5"; break;
471 case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */
472 case USB_SPEED_FULL:
473 speed = "12"; break;
474 case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */
475 case USB_SPEED_HIGH:
476 speed = "480"; break;
477 case USB_SPEED_SUPER:
478 speed = "5000"; break;
479 case USB_SPEED_SUPER_PLUS:
480 speed = "10000"; break;
481 default:
482 speed = "??";
483 }
484 data_end = pages_start + sprintf(pages_start, format_topo,
485 bus->busnum, level, parent_devnum,
486 index, count, usbdev->devnum,
487 speed, usbdev->maxchild);
488 /*
489 * level = topology-tier level;
490 * parent_devnum = parent device number;
491 * index = parent's connector number;
492 * count = device count at this level
493 */
494 /* If this is the root hub, display the bandwidth information */
495 if (level == 0) {
496 int max;
497
498 /* super/high speed reserves 80%, full/low reserves 90% */
499 if (usbdev->speed == USB_SPEED_HIGH ||
500 usbdev->speed >= USB_SPEED_SUPER)
501 max = 800;
502 else
503 max = FRAME_TIME_MAX_USECS_ALLOC;
504
505 /* report "average" periodic allocation over a microsecond.
506 * the schedules are actually bursty, HCDs need to deal with
507 * that and just compute/report this average.
508 */
509 data_end += sprintf(data_end, format_bandwidth,
510 bus->bandwidth_allocated, max,
511 (100 * bus->bandwidth_allocated + max / 2)
512 / max,
513 bus->bandwidth_int_reqs,
514 bus->bandwidth_isoc_reqs);
515
516 }
517 data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256,
518 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 usb_hub_for_each_child(usbdev, chix, childdev) {
545 usb_lock_device(childdev);
546 ret = usb_device_dump(buffer, nbytes, skip_bytes,
547 file_offset, childdev, bus,
548 level + 1, chix - 1, ++cnt);
549 usb_unlock_device(childdev);
550 if (ret == -EFAULT)
551 return total_written;
552 total_written += ret;
553 }
554 return total_written;
555}
556
557static ssize_t usb_device_read(struct file *file, char __user *buf,
558 size_t nbytes, loff_t *ppos)
559{
560 struct usb_bus *bus;
561 ssize_t ret, total_written = 0;
562 loff_t skip_bytes = *ppos;
563 int id;
564
565 if (*ppos < 0)
566 return -EINVAL;
567 if (nbytes <= 0)
568 return 0;
569
570 mutex_lock(&usb_bus_idr_lock);
571 /* print devices for all busses */
572 idr_for_each_entry(&usb_bus_idr, bus, id) {
573 /* recurse through all children of the root hub */
574 if (!bus_to_hcd(bus)->rh_registered)
575 continue;
576 usb_lock_device(bus->root_hub);
577 ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos,
578 bus->root_hub, bus, 0, 0, 0);
579 usb_unlock_device(bus->root_hub);
580 if (ret < 0) {
581 mutex_unlock(&usb_bus_idr_lock);
582 return ret;
583 }
584 total_written += ret;
585 }
586 mutex_unlock(&usb_bus_idr_lock);
587 return total_written;
588}
589
590const struct file_operations usbfs_devices_fops = {
591 .llseek = no_seek_end_llseek,
592 .read = usb_device_read,
593};