1/*
2 * devices.c
3 * (C) Copyright 1999 Randy Dunlap.
4 * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>.
5 *     (proc file per device)
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
50 */
51
52#include <linux/fs.h>
53#include <linux/mm.h>
54#include <linux/gfp.h>
55#include <linux/poll.h>
56#include <linux/usb.h>
57#include <linux/usbdevice_fs.h>
58#include <linux/usb/hcd.h>
59#include <linux/mutex.h>
60#include <linux/uaccess.h>
61
62#include "usb.h"
63
64/* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */
65#define ALLOW_SERIAL_NUMBER
66
67static const char format_topo[] =
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";
70
71static const char format_string_manufacturer[] =
72/* S:  Manufacturer=xxxx */
73  "S:  Manufacturer=%.100s\n";
74
75static const char format_string_product[] =
76/* S:  Product=xxxx */
77  "S:  Product=%.100s\n";
78
79#ifdef ALLOW_SERIAL_NUMBER
80static const char format_string_serialnumber[] =
81/* S:  SerialNumber=xxxx */
82  "S:  SerialNumber=%.100s\n";
83#endif
84
85static const char format_bandwidth[] =
86/* B:  Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */
87  "B:  Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n";
88
89static const char format_device1[] =
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
93static const char format_device2[] =
94/* P:  Vendor=xxxx ProdID=xxxx Rev=xx.xx */
95  "P:  Vendor=%04x ProdID=%04x Rev=%2x.%02x\n";
96
97static const char format_config[] =
98/* C:  #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */
99  "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n";
100
101static const char format_iad[] =
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
105static const char format_iface[] =
106/* I:  If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/
107  "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n";
108
109static const char format_endpt[] =
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
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 */
128static 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};
135
136struct class_info {
137	int class;
138	char *class_name;
139};
140
141static const struct class_info clas_info[] = {
142	/* max. 5 chars. per name string */
143	{USB_CLASS_PER_INTERFACE,	">ifc"},
144	{USB_CLASS_AUDIO,		"audio"},
145	{USB_CLASS_COMM,		"comm."},
146	{USB_CLASS_HID,			"HID"},
147	{USB_CLASS_PHYSICAL,		"PID"},
148	{USB_CLASS_STILL_IMAGE,		"still"},
149	{USB_CLASS_PRINTER,		"print"},
150	{USB_CLASS_MASS_STORAGE,	"stor."},
151	{USB_CLASS_HUB,			"hub"},
152	{USB_CLASS_CDC_DATA,		"data"},
153	{USB_CLASS_CSCID,		"scard"},
154	{USB_CLASS_CONTENT_SEC,		"c-sec"},
155	{USB_CLASS_VIDEO,		"video"},
156	{USB_CLASS_WIRELESS_CONTROLLER,	"wlcon"},
157	{USB_CLASS_MISC,		"misc"},
158	{USB_CLASS_APP_SPEC,		"app."},
159	{USB_CLASS_VENDOR_SPEC,		"vend."},
160	{-1,				"unk."}		/* leave as last */
161};
162
163/*****************************************************************/
164
165void usbfs_conn_disc_event(void)
166{
167	atomic_add(2, &device_event.count);
168	wake_up(&device_event.wait);
169}
170
171static 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;
178	return clas_info[ix].class_name;
179}
180
181static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
182				const struct usb_endpoint_descriptor *desc)
183{
184	char dir, unit, *type;
185	unsigned interval, bandwidth = 1;
186
187	if (start > end)
188		return start;
189
190	dir = usb_endpoint_dir_in(desc) ? 'I' : 'O';
191
192	if (speed == USB_SPEED_HIGH) {
193		switch (usb_endpoint_maxp(desc) & (0x03 << 11)) {
194		case 1 << 11:
195			bandwidth = 2; break;
196		case 2 << 11:
197			bandwidth = 3; break;
198		}
199	}
200
201	/* this isn't checking for illegal values */
202	switch (usb_endpoint_type(desc)) {
203	case USB_ENDPOINT_XFER_CONTROL:
204		type = "Ctrl";
205		if (speed == USB_SPEED_HIGH)	/* uframes per NAK */
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";
217		if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */
218			interval = desc->bInterval;
219		else
220			interval = 0;
221		break;
222	case USB_ENDPOINT_XFER_INT:
223		type = "Int.";
224		if (speed == USB_SPEED_HIGH || speed == USB_SPEED_SUPER)
225			interval = 1 << (desc->bInterval - 1);
226		else
227			interval = desc->bInterval;
228		break;
229	default:	/* "can't happen" */
230		return start;
231	}
232	interval *= (speed == USB_SPEED_HIGH ||
233		     speed == USB_SPEED_SUPER) ? 125 : 1000;
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,
243			 (usb_endpoint_maxp(desc) & 0x07ff) *
244			 bandwidth,
245			 interval, unit);
246	return start;
247}
248
249static char *usb_dump_interface_descriptor(char *start, char *end,
250					const struct usb_interface_cache *intfc,
251					const struct usb_interface *iface,
252					int setno)
253{
254	const struct usb_interface_descriptor *desc;
255	const char *driver_name = "";
256	int active = 0;
257
258	if (start > end)
259		return start;
260	desc = &intfc->altsetting[setno].desc;
261	if (iface) {
262		driver_name = (iface->dev.driver
263				? iface->dev.driver->name
264				: "(none)");
265		active = (desc == &iface->cur_altsetting->desc);
266	}
267	start += sprintf(start, format_iface,
268			 active ? '*' : ' ',	/* mark active altsetting */
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);
277	return start;
278}
279
280static 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{
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
297static char *usb_dump_iad_descriptor(char *start, char *end,
298			const struct usb_interface_assoc_descriptor *iad)
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
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 */
317static char *usb_dump_config_descriptor(char *start, char *end,
318				const struct usb_config_descriptor *desc,
319				int active)
320{
321	if (start > end)
322		return start;
323	start += sprintf(start, format_config,
324			 /* mark active/actual/current cfg. */
325			 active ? '*' : ' ',
326			 desc->bNumInterfaces,
327			 desc->bConfigurationValue,
328			 desc->bmAttributes,
329			 desc->bMaxPower * 2);
330	return start;
331}
332
333static char *usb_dump_config(int speed, char *start, char *end,
334			     const struct usb_host_config *config, int active)
335{
336	int i, j;
337	struct usb_interface_cache *intfc;
338	struct usb_interface *interface;
339
340	if (start > end)
341		return start;
342	if (!config)
343		/* getting these some in 2.3.7; none in 2.3.6 */
344		return start + sprintf(start, "(null Cfg. desc.)\n");
345	start = usb_dump_config_descriptor(start, end, &config->desc, active);
346	for (i = 0; i < USB_MAXIADS; i++) {
347		if (config->intf_assoc[i] == NULL)
348			break;
349		start = usb_dump_iad_descriptor(start, end,
350					config->intf_assoc[i]);
351	}
352	for (i = 0; i < config->desc.bNumInterfaces; i++) {
353		intfc = config->intf_cache[i];
354		interface = config->interface[i];
355		for (j = 0; j < intfc->num_altsetting; j++) {
356			if (start > end)
357				return start;
358			start = usb_dump_interface(speed,
359				start, end, intfc, interface, j);
360		}
361	}
362	return start;
363}
364
365/*
366 * Dump the different USB descriptors.
367 */
368static char *usb_dump_device_descriptor(char *start, char *end,
369				const struct usb_device_descriptor *desc)
370{
371	u16 bcdUSB = le16_to_cpu(desc->bcdUSB);
372	u16 bcdDevice = le16_to_cpu(desc->bcdDevice);
373
374	if (start > end)
375		return start;
376	start += sprintf(start, format_device1,
377			  bcdUSB >> 8, bcdUSB & 0xff,
378			  desc->bDeviceClass,
379			  class_decode(desc->bDeviceClass),
380			  desc->bDeviceSubClass,
381			  desc->bDeviceProtocol,
382			  desc->bMaxPacketSize0,
383			  desc->bNumConfigurations);
384	if (start > end)
385		return start;
386	start += sprintf(start, format_device2,
387			 le16_to_cpu(desc->idVendor),
388			 le16_to_cpu(desc->idProduct),
389			 bcdDevice >> 8, bcdDevice & 0xff);
390	return start;
391}
392
393/*
394 * Dump the different strings that this device holds.
395 */
396static char *usb_dump_device_strings(char *start, char *end,
397				     struct usb_device *dev)
398{
399	if (start > end)
400		return start;
401	if (dev->manufacturer)
402		start += sprintf(start, format_string_manufacturer,
403				 dev->manufacturer);
404	if (start > end)
405		goto out;
406	if (dev->product)
407		start += sprintf(start, format_string_product, dev->product);
408	if (start > end)
409		goto out;
410#ifdef ALLOW_SERIAL_NUMBER
411	if (dev->serial)
412		start += sprintf(start, format_string_serialnumber,
413				 dev->serial);
414#endif
415 out:
416	return start;
417}
418
419static char *usb_dump_desc(char *start, char *end, struct usb_device *dev)
420{
421	int i;
422
423	if (start > end)
424		return start;
425
426	start = usb_dump_device_descriptor(start, end, &dev->descriptor);
427
428	if (start > end)
429		return start;
430
431	start = usb_dump_device_strings(start, end, dev);
432
433	for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {
434		if (start > end)
435			return start;
436		start = usb_dump_config(dev->speed,
437				start, end, dev->config + i,
438				/* active ? */
439				(dev->config + i) == dev->actconfig);
440	}
441	return start;
442}
443
444
445#ifdef PROC_EXTRA /* TBD: may want to add this code later */
446
447static char *usb_dump_hub_descriptor(char *start, char *end,
448				     const struct usb_hub_descriptor *desc)
449{
450	int leng = USB_DT_HUB_NONVAR_SIZE;
451	unsigned char *ptr = (unsigned char *)desc;
452
453	if (start > end)
454		return start;
455	start += sprintf(start, "Interface:");
456	while (leng && start <= end) {
457		start += sprintf(start, " %02x", *ptr);
458		ptr++; leng--;
459	}
460	*start++ = '\n';
461	return start;
462}
463
464static char *usb_dump_string(char *start, char *end,
465			     const struct usb_device *dev, char *id, int index)
466{
467	if (start > end)
468		return start;
469	start += sprintf(start, "Interface:");
470	if (index <= dev->maxstring && dev->stringindex &&
471	    dev->stringindex[index])
472		start += sprintf(start, "%s: %.100s ", id,
473				 dev->stringindex[index]);
474	return start;
475}
476
477#endif /* PROC_EXTRA */
478
479/*****************************************************************/
480
481/* This is a recursive function. Parameters:
482 * buffer - the user-space buffer to write data into
483 * nbytes - the maximum number of bytes to write
484 * skip_bytes - the number of bytes to skip before writing anything
485 * file_offset - the offset into the devices file on completion
486 * The caller must own the device lock.
487 */
488static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
489			       loff_t *skip_bytes, loff_t *file_offset,
490			       struct usb_device *usbdev, struct usb_bus *bus,
491			       int level, int index, int count)
492{
493	int chix;
494	int ret, cnt = 0;
495	int parent_devnum = 0;
496	char *pages_start, *data_end, *speed;
497	unsigned int length;
498	ssize_t total_written = 0;
499
500	/* don't bother with anything else if we're not writing any data */
501	if (*nbytes <= 0)
502		return 0;
503
504	if (level > MAX_TOPO_LEVEL)
505		return 0;
506	/* allocate 2^1 pages = 8K (on i386);
507	 * should be more than enough for one device */
508	pages_start = (char *)__get_free_pages(GFP_NOIO, 1);
509	if (!pages_start)
510		return -ENOMEM;
511
512	if (usbdev->parent && usbdev->parent->devnum != -1)
513		parent_devnum = usbdev->parent->devnum;
514	/*
515	 * So the root hub's parent is 0 and any device that is
516	 * plugged into the root hub has a parent of 0.
517	 */
518	switch (usbdev->speed) {
519	case USB_SPEED_LOW:
520		speed = "1.5"; break;
521	case USB_SPEED_UNKNOWN:		/* usb 1.1 root hub code */
522	case USB_SPEED_FULL:
523		speed = "12"; break;
524	case USB_SPEED_WIRELESS:	/* Wireless has no real fixed speed */
525	case USB_SPEED_HIGH:
526		speed = "480"; break;
527	case USB_SPEED_SUPER:
528		speed = "5000"; break;
529	default:
530		speed = "??";
531	}
532	data_end = pages_start + sprintf(pages_start, format_topo,
533			bus->busnum, level, parent_devnum,
534			index, count, usbdev->devnum,
535			speed, usbdev->maxchild);
536	/*
537	 * level = topology-tier level;
538	 * parent_devnum = parent device number;
539	 * index = parent's connector number;
540	 * count = device count at this level
541	 */
542	/* If this is the root hub, display the bandwidth information */
543	if (level == 0) {
544		int	max;
545
546		/* super/high speed reserves 80%, full/low reserves 90% */
547		if (usbdev->speed == USB_SPEED_HIGH ||
548		    usbdev->speed == USB_SPEED_SUPER)
549			max = 800;
550		else
551			max = FRAME_TIME_MAX_USECS_ALLOC;
552
553		/* report "average" periodic allocation over a microsecond.
554		 * the schedules are actually bursty, HCDs need to deal with
555		 * that and just compute/report this average.
556		 */
557		data_end += sprintf(data_end, format_bandwidth,
558				bus->bandwidth_allocated, max,
559				(100 * bus->bandwidth_allocated + max / 2)
560					/ max,
561				bus->bandwidth_int_reqs,
562				bus->bandwidth_isoc_reqs);
563
564	}
565	data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256,
566				 usbdev);
567
568	if (data_end > (pages_start + (2 * PAGE_SIZE) - 256))
569		data_end += sprintf(data_end, "(truncated)\n");
570
571	length = data_end - pages_start;
572	/* if we can start copying some data to the user */
573	if (length > *skip_bytes) {
574		length -= *skip_bytes;
575		if (length > *nbytes)
576			length = *nbytes;
577		if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) {
578			free_pages((unsigned long)pages_start, 1);
579			return -EFAULT;
580		}
581		*nbytes -= length;
582		*file_offset += length;
583		total_written += length;
584		*buffer += length;
585		*skip_bytes = 0;
586	} else
587		*skip_bytes -= length;
588
589	free_pages((unsigned long)pages_start, 1);
590
591	/* Now look at all of this device's children. */
592	for (chix = 0; chix < usbdev->maxchild; chix++) {
593		struct usb_device *childdev = usbdev->children[chix];
594
595		if (childdev) {
596			usb_lock_device(childdev);
597			ret = usb_device_dump(buffer, nbytes, skip_bytes,
598					      file_offset, childdev, bus,
599					      level + 1, chix, ++cnt);
600			usb_unlock_device(childdev);
601			if (ret == -EFAULT)
602				return total_written;
603			total_written += ret;
604		}
605	}
606	return total_written;
607}
608
609static ssize_t usb_device_read(struct file *file, char __user *buf,
610			       size_t nbytes, loff_t *ppos)
611{
612	struct usb_bus *bus;
613	ssize_t ret, total_written = 0;
614	loff_t skip_bytes = *ppos;
615
616	if (*ppos < 0)
617		return -EINVAL;
618	if (nbytes <= 0)
619		return 0;
620	if (!access_ok(VERIFY_WRITE, buf, nbytes))
621		return -EFAULT;
622
623	mutex_lock(&usb_bus_list_lock);
624	/* print devices for all busses */
625	list_for_each_entry(bus, &usb_bus_list, bus_list) {
626		/* recurse through all children of the root hub */
627		if (!bus->root_hub)
628			continue;
629		usb_lock_device(bus->root_hub);
630		ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos,
631				      bus->root_hub, bus, 0, 0, 0);
632		usb_unlock_device(bus->root_hub);
633		if (ret < 0) {
634			mutex_unlock(&usb_bus_list_lock);
635			return ret;
636		}
637		total_written += ret;
638	}
639	mutex_unlock(&usb_bus_list_lock);
640	return total_written;
641}
642
643/* Kernel lock for "lastev" protection */
644static unsigned int usb_device_poll(struct file *file,
645				    struct poll_table_struct *wait)
646{
647	unsigned int event_count;
648
649	poll_wait(file, &device_event.wait, wait);
650
651	event_count = atomic_read(&device_event.count);
652	if (file->f_version != event_count) {
653		file->f_version = event_count;
654		return POLLIN | POLLRDNORM;
655	}
656
657	return 0;
658}
659
660static loff_t usb_device_lseek(struct file *file, loff_t offset, int orig)
661{
662	loff_t ret;
663
664	mutex_lock(&file->f_dentry->d_inode->i_mutex);
665
666	switch (orig) {
667	case 0:
668		file->f_pos = offset;
669		ret = file->f_pos;
670		break;
671	case 1:
672		file->f_pos += offset;
673		ret = file->f_pos;
674		break;
675	case 2:
676	default:
677		ret = -EINVAL;
678	}
679
680	mutex_unlock(&file->f_dentry->d_inode->i_mutex);
681	return ret;
682}
683
684const struct file_operations usbfs_devices_fops = {
685	.llseek =	usb_device_lseek,
686	.read =		usb_device_read,
687	.poll =		usb_device_poll,
688};
689