summaryrefslogtreecommitdiffstats
path: root/drivers/usb/core/sysfs.c
blob: e7c982377488fca4b727d9d2edd7084269298b1b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
/*
 * drivers/usb/core/sysfs.c
 *
 * (C) Copyright 2002 David Brownell
 * (C) Copyright 2002,2004 Greg Kroah-Hartman
 * (C) Copyright 2002,2004 IBM Corp.
 *
 * All of the sysfs file attributes for usb devices and interfaces.
 *
 */


#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/usb.h>
#include "usb.h"

/* Active configuration fields */
#define usb_actconfig_show(field, multiplier, format_string)		\
static ssize_t  show_##field(struct device *dev,			\
		struct device_attribute *attr, char *buf)		\
{									\
	struct usb_device *udev;					\
	struct usb_host_config *actconfig;				\
									\
	udev = to_usb_device(dev);					\
	actconfig = udev->actconfig;					\
	if (actconfig)							\
		return sprintf(buf, format_string,			\
				actconfig->desc.field * multiplier);	\
	else								\
		return 0;						\
}									\

#define usb_actconfig_attr(field, multiplier, format_string)		\
usb_actconfig_show(field, multiplier, format_string)			\
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
usb_actconfig_attr(bmAttributes, 1, "%2x\n")
usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")

static ssize_t show_configuration_string(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;
	struct usb_host_config *actconfig;

	udev = to_usb_device(dev);
	actconfig = udev->actconfig;
	if ((!actconfig) || (!actconfig->string))
		return 0;
	return sprintf(buf, "%s\n", actconfig->string);
}
static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);

/* configuration value is always present, and r/w */
usb_actconfig_show(bConfigurationValue, 1, "%u\n");

static ssize_t
set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct usb_device	*udev = to_usb_device(dev);
	int			config, value;

	if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
		return -EINVAL;
	usb_lock_device(udev);
	value = usb_set_configuration(udev, config);
	usb_unlock_device(udev);
	return (value < 0) ? value : count;
}

static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR, 
		show_bConfigurationValue, set_bConfigurationValue);

/* String fields */
#define usb_string_attr(name)						\
static ssize_t  show_##name(struct device *dev,				\
		struct device_attribute *attr, char *buf)		\
{									\
	struct usb_device *udev;					\
									\
	udev = to_usb_device(dev);					\
	return sprintf(buf, "%s\n", udev->name);			\
}									\
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);

usb_string_attr(product);
usb_string_attr(manufacturer);
usb_string_attr(serial);

static ssize_t
show_speed(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;
	char *speed;

	udev = to_usb_device(dev);

	switch (udev->speed) {
	case USB_SPEED_LOW:
		speed = "1.5";
		break;
	case USB_SPEED_UNKNOWN:
	case USB_SPEED_FULL:
		speed = "12";
		break;
	case USB_SPEED_HIGH:
		speed = "480";
		break;
	default:
		speed = "unknown";
	}
	return sprintf(buf, "%s\n", speed);
}
static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);

static ssize_t
show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;

	udev = to_usb_device(dev);
	return sprintf(buf, "%d\n", udev->bus->busnum);
}
static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);

static ssize_t
show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;

	udev = to_usb_device(dev);
	return sprintf(buf, "%d\n", udev->devnum);
}
static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);

static ssize_t
show_version(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;
	u16 bcdUSB;

	udev = to_usb_device(dev);
	bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
	return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
}
static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);

static ssize_t
show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;

	udev = to_usb_device(dev);
	return sprintf(buf, "%d\n", udev->maxchild);
}
static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);

static ssize_t
show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev;

	udev = to_usb_device(dev);
	return sprintf(buf, "0x%x\n", udev->quirks);
}
static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);

#ifdef	CONFIG_USB_SUSPEND

static ssize_t
show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev = to_usb_device(dev);

	return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
}

static ssize_t
set_autosuspend(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct usb_device *udev = to_usb_device(dev);
	int value;

	if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
			value <= - INT_MAX/HZ)
		return -EINVAL;
	value *= HZ;

	udev->autosuspend_delay = value;
	if (value >= 0)
		usb_try_autosuspend_device(udev);
	else {
		if (usb_autoresume_device(udev) == 0)
			usb_autosuspend_device(udev);
	}
	return count;
}

static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
		show_autosuspend, set_autosuspend);

static const char on_string[] = "on";
static const char auto_string[] = "auto";
static const char suspend_string[] = "suspend";

static ssize_t
show_level(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_device *udev = to_usb_device(dev);
	const char *p = auto_string;

	if (udev->state == USB_STATE_SUSPENDED) {
		if (udev->autoresume_disabled)
			p = suspend_string;
	} else {
		if (udev->autosuspend_disabled)
			p = on_string;
	}
	return sprintf(buf, "%s\n", p);
}

static ssize_t
set_level(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct usb_device *udev = to_usb_device(dev);
	int len = count;
	char *cp;
	int rc = 0;

	cp = memchr(buf, '\n', count);
	if (cp)
		len = cp - buf;

	usb_lock_device(udev);

	/* Setting the flags without calling usb_pm_lock is a subject to
	 * races, but who cares...
	 */
	if (len == sizeof on_string - 1 &&
			strncmp(buf, on_string, len) == 0) {
		udev->autosuspend_disabled = 1;
		udev->autoresume_disabled = 0;
		rc = usb_external_resume_device(udev);

	} else if (len == sizeof auto_string - 1 &&
			strncmp(buf, auto_string, len) == 0) {
		udev->autosuspend_disabled = 0;
		udev->autoresume_disabled = 0;
		rc = usb_external_resume_device(udev);

	} else if (len == sizeof suspend_string - 1 &&
			strncmp(buf, suspend_string, len) == 0) {
		udev->autosuspend_disabled = 0;
		udev->autoresume_disabled = 1;
		rc = usb_external_suspend_device(udev, PMSG_SUSPEND);

	} else
		rc = -EINVAL;

	usb_unlock_device(udev);
	return (rc < 0 ? rc : count);
}

static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);

static char power_group[] = "power";

static int add_power_attributes(struct device *dev)
{
	int rc = 0;

	if (is_usb_device(dev)) {
		rc = sysfs_add_file_to_group(&dev->kobj,
				&dev_attr_autosuspend.attr,
				power_group);
		if (rc == 0)
			rc = sysfs_add_file_to_group(&dev->kobj,
					&dev_attr_level.attr,
					power_group);
	}
	return rc;
}

static void remove_power_attributes(struct device *dev)
{
	sysfs_remove_file_from_group(&dev->kobj,
			&dev_attr_level.attr,
			power_group);
	sysfs_remove_file_from_group(&dev->kobj,
			&dev_attr_autosuspend.attr,
			power_group);
}

#else

#define add_power_attributes(dev)	0
#define remove_power_attributes(dev)	do {} while (0)

#endif	/* CONFIG_USB_SUSPEND */

/* Descriptor fields */
#define usb_descriptor_attr_le16(field, format_string)			\
static ssize_t								\
show_##field(struct device *dev, struct device_attribute *attr,	\
		char *buf)						\
{									\
	struct usb_device *udev;					\
									\
	udev = to_usb_device(dev);					\
	return sprintf(buf, format_string, 				\
			le16_to_cpu(udev->descriptor.field));		\
}									\
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

usb_descriptor_attr_le16(idVendor, "%04x\n")
usb_descriptor_attr_le16(idProduct, "%04x\n")
usb_descriptor_attr_le16(bcdDevice, "%04x\n")

#define usb_descriptor_attr(field, format_string)			\
static ssize_t								\
show_##field(struct device *dev, struct device_attribute *attr,	\
		char *buf)						\
{									\
	struct usb_device *udev;					\
									\
	udev = to_usb_device(dev);					\
	return sprintf(buf, format_string, udev->descriptor.field);	\
}									\
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

usb_descriptor_attr(bDeviceClass, "%02x\n")
usb_descriptor_attr(bDeviceSubClass, "%02x\n")
usb_descriptor_attr(bDeviceProtocol, "%02x\n")
usb_descriptor_attr(bNumConfigurations, "%d\n")
usb_descriptor_attr(bMaxPacketSize0, "%d\n")

static struct attribute *dev_attrs[] = {
	/* current configuration's attributes */
	&dev_attr_configuration.attr,
	&dev_attr_bNumInterfaces.attr,
	&dev_attr_bConfigurationValue.attr,
	&dev_attr_bmAttributes.attr,
	&dev_attr_bMaxPower.attr,
	/* device attributes */
	&dev_attr_idVendor.attr,
	&dev_attr_idProduct.attr,
	&dev_attr_bcdDevice.attr,
	&dev_attr_bDeviceClass.attr,
	&dev_attr_bDeviceSubClass.attr,
	&dev_attr_bDeviceProtocol.attr,
	&dev_attr_bNumConfigurations.attr,
	&dev_attr_bMaxPacketSize0.attr,
	&dev_attr_speed.attr,
	&dev_attr_busnum.attr,
	&dev_attr_devnum.attr,
	&dev_attr_version.attr,
	&dev_attr_maxchild.attr,
	&dev_attr_quirks.attr,
	NULL,
};
static struct attribute_group dev_attr_grp = {
	.attrs = dev_attrs,
};

int usb_create_sysfs_dev_files(struct usb_device *udev)
{
	struct device *dev = &udev->dev;
	int retval;

	retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
	if (retval)
		return retval;

	retval = add_power_attributes(dev);
	if (retval)
		goto error;

	if (udev->manufacturer) {
		retval = device_create_file(dev, &dev_attr_manufacturer);
		if (retval)
			goto error;
	}
	if (udev->product) {
		retval = device_create_file(dev, &dev_attr_product);
		if (retval)
			goto error;
	}
	if (udev->serial) {
		retval = device_create_file(dev, &dev_attr_serial);
		if (retval)
			goto error;
	}
	retval = usb_create_ep_files(dev, &udev->ep0, udev);
	if (retval)
		goto error;
	return 0;
error:
	usb_remove_sysfs_dev_files(udev);
	return retval;
}

void usb_remove_sysfs_dev_files(struct usb_device *udev)
{
	struct device *dev = &udev->dev;

	usb_remove_ep_files(&udev->ep0);
	device_remove_file(dev, &dev_attr_manufacturer);
	device_remove_file(dev, &dev_attr_product);
	device_remove_file(dev, &dev_attr_serial);
	remove_power_attributes(dev);
	sysfs_remove_group(&dev->kobj, &dev_attr_grp);
}

/* Interface fields */
#define usb_intf_attr(field, format_string)				\
static ssize_t								\
show_##field(struct device *dev, struct device_attribute *attr,	\
		char *buf)						\
{									\
	struct usb_interface *intf = to_usb_interface(dev);		\
									\
	return sprintf(buf, format_string,				\
			intf->cur_altsetting->desc.field); 		\
}									\
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

usb_intf_attr(bInterfaceNumber, "%02x\n")
usb_intf_attr(bAlternateSetting, "%2d\n")
usb_intf_attr(bNumEndpoints, "%02x\n")
usb_intf_attr(bInterfaceClass, "%02x\n")
usb_intf_attr(bInterfaceSubClass, "%02x\n")
usb_intf_attr(bInterfaceProtocol, "%02x\n")

static ssize_t show_interface_string(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf;
	struct usb_device *udev;
	int len;

	intf = to_usb_interface(dev);
	udev = interface_to_usbdev(intf);
	len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
	if (len < 0)
		return 0;
	buf[len] = '\n';
	buf[len+1] = 0;
	return len+1;
}
static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);

static ssize_t show_modalias(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf;
	struct usb_device *udev;
	struct usb_host_interface *alt;

	intf = to_usb_interface(dev);
	udev = interface_to_usbdev(intf);
	alt = intf->cur_altsetting;

	return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
			"ic%02Xisc%02Xip%02X\n",
			le16_to_cpu(udev->descriptor.idVendor),
			le16_to_cpu(udev->descriptor.idProduct),
			le16_to_cpu(udev->descriptor.bcdDevice),
			udev->descriptor.bDeviceClass,
			udev->descriptor.bDeviceSubClass,
			udev->descriptor.bDeviceProtocol,
			alt->desc.bInterfaceClass,
			alt->desc.bInterfaceSubClass,
			alt->desc.bInterfaceProtocol);
}
static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);

static struct attribute *intf_attrs[] = {
	&dev_attr_bInterfaceNumber.attr,
	&dev_attr_bAlternateSetting.attr,
	&dev_attr_bNumEndpoints.attr,
	&dev_attr_bInterfaceClass.attr,
	&dev_attr_bInterfaceSubClass.attr,
	&dev_attr_bInterfaceProtocol.attr,
	&dev_attr_modalias.attr,
	NULL,
};
static struct attribute_group intf_attr_grp = {
	.attrs = intf_attrs,
};

static inline void usb_create_intf_ep_files(struct usb_interface *intf,
		struct usb_device *udev)
{
	struct usb_host_interface *iface_desc;
	int i;

	iface_desc = intf->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
		usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
				udev);
}

static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
{
	struct usb_host_interface *iface_desc;
	int i;

	iface_desc = intf->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
		usb_remove_ep_files(&iface_desc->endpoint[i]);
}

int usb_create_sysfs_intf_files(struct usb_interface *intf)
{
	struct device *dev = &intf->dev;
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_host_interface *alt = intf->cur_altsetting;
	int retval;

	retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
	if (retval)
		return retval;

	if (alt->string == NULL)
		alt->string = usb_cache_string(udev, alt->desc.iInterface);
	if (alt->string)
		retval = device_create_file(dev, &dev_attr_interface);
	usb_create_intf_ep_files(intf, udev);
	return 0;
}

void usb_remove_sysfs_intf_files(struct usb_interface *intf)
{
	struct device *dev = &intf->dev;

	usb_remove_intf_ep_files(intf);
	device_remove_file(dev, &dev_attr_interface);
	sysfs_remove_group(&dev->kobj, &intf_attr_grp);
}
OpenPOWER on IntegriCloud