aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/core/sysfs.c
blob: ec9b3bde8ae595e7e61f4e60823505d40c6a0a6a (plain) (blame)
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
/*
 * 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/config.h>
#include <linux/kernel.h>

#ifdef CONFIG_USB_DEBUG
	#define DEBUG
#else
	#undef DEBUG
#endif
#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, 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, char *buf)
{
	struct usb_device *udev;
	struct usb_host_config *actconfig;
	int len;

	udev = to_usb_device (dev);
	actconfig = udev->actconfig;
	if ((!actconfig) || (!actconfig->string))
		return 0;
	len = sprintf(buf, actconfig->string, PAGE_SIZE);
	if (len < 0)
		return 0;
	buf[len] = '\n';
	buf[len+1] = 0;
	return len+1;
}
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, const char *buf, size_t count)
{
	struct usb_device	*udev = udev = to_usb_device (dev);
	int			config, value;

	if (sscanf (buf, "%u", &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, char *buf)		\
{									\
	struct usb_device *udev;					\
	int len;							\
									\
	udev = to_usb_device (dev);					\
	len = snprintf(buf, 256, "%s", udev->name);			\
	if (len < 0)							\
		return 0;						\
	buf[len] = '\n';						\
	buf[len+1] = 0;							\
	return len+1;							\
}									\
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, 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_devnum (struct device *dev, 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, 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, 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);

/* Descriptor fields */
#define usb_descriptor_attr_le16(field, format_string)			\
static ssize_t								\
show_##field (struct device *dev, 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, 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")

static struct attribute *dev_attrs[] = {
	/* current configuration's attributes */
	&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_speed.attr,
	&dev_attr_devnum.attr,
	&dev_attr_version.attr,
	&dev_attr_maxchild.attr,
	NULL,
};
static struct attribute_group dev_attr_grp = {
	.attrs = dev_attrs,
};

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

	sysfs_create_group(&dev->kobj, &dev_attr_grp);

	if (udev->manufacturer)
		device_create_file (dev, &dev_attr_manufacturer);
	if (udev->product)
		device_create_file (dev, &dev_attr_product);
	if (udev->serial)
		device_create_file (dev, &dev_attr_serial);
	device_create_file (dev, &dev_attr_configuration);
}

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

	sysfs_remove_group(&dev->kobj, &dev_attr_grp);

	if (udev->descriptor.iManufacturer)
		device_remove_file(dev, &dev_attr_manufacturer);
	if (udev->descriptor.iProduct)
		device_remove_file(dev, &dev_attr_product);
	if (udev->descriptor.iSerialNumber)
		device_remove_file(dev, &dev_attr_serial);
	device_remove_file (dev, &dev_attr_configuration);
}

/* Interface fields */
#define usb_intf_attr(field, format_string)				\
static ssize_t								\
show_##field (struct device *dev, 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, 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 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,
	NULL,
};
static struct attribute_group intf_attr_grp = {
	.attrs = intf_attrs,
};

void usb_create_sysfs_intf_files (struct usb_interface *intf)
{
	sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);

	if (intf->cur_altsetting->string)
		device_create_file(&intf->dev, &dev_attr_interface);
		
}

void usb_remove_sysfs_intf_files (struct usb_interface *intf)
{
	sysfs_remove_group(&intf->dev.kobj, &intf_attr_grp);

	if (intf->cur_altsetting->string)
		device_remove_file(&intf->dev, &dev_attr_interface);

}