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
|
/*
* USB LED driver - 1.1
*
* Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb.h>
#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com"
#define DRIVER_DESC "USB LED Driver"
#define VENDOR_ID 0x0fc5
#define PRODUCT_ID 0x1223
/* table of devices that work with this driver */
static struct usb_device_id id_table [] = {
{ USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
{ },
};
MODULE_DEVICE_TABLE (usb, id_table);
struct usb_led {
struct usb_device * udev;
unsigned char blue;
unsigned char red;
unsigned char green;
};
#define BLUE 0x04
#define RED 0x02
#define GREEN 0x01
static void change_color(struct usb_led *led)
{
int retval;
unsigned char color = 0x07;
unsigned char *buffer;
buffer = kmalloc(8, GFP_KERNEL);
if (!buffer) {
dev_err(&led->udev->dev, "out of memory\n");
return;
}
if (led->blue)
color &= ~(BLUE);
if (led->red)
color &= ~(RED);
if (led->green)
color &= ~(GREEN);
dev_dbg(&led->udev->dev,
"blue = %d, red = %d, green = %d, color = %.2x\n",
led->blue, led->red, led->green, color);
retval = usb_control_msg(led->udev,
usb_sndctrlpipe(led->udev, 0),
0x12,
0xc8,
(0x02 * 0x100) + 0x0a,
(0x00 * 0x100) + color,
buffer,
8,
2000);
if (retval)
dev_dbg(&led->udev->dev, "retval = %d\n", retval);
kfree(buffer);
}
#define show_set(value) \
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_led *led = usb_get_intfdata(intf); \
\
return sprintf(buf, "%d\n", led->value); \
} \
static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_led *led = usb_get_intfdata(intf); \
int temp = simple_strtoul(buf, NULL, 10); \
\
led->value = temp; \
change_color(led); \
return count; \
} \
static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##value);
show_set(blue);
show_set(red);
show_set(green);
static int led_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct usb_led *dev = NULL;
int retval = -ENOMEM;
dev = kmalloc(sizeof(struct usb_led), GFP_KERNEL);
if (dev == NULL) {
dev_err(&interface->dev, "Out of memory\n");
goto error;
}
memset (dev, 0x00, sizeof (*dev));
dev->udev = usb_get_dev(udev);
usb_set_intfdata (interface, dev);
device_create_file(&interface->dev, &dev_attr_blue);
device_create_file(&interface->dev, &dev_attr_red);
device_create_file(&interface->dev, &dev_attr_green);
dev_info(&interface->dev, "USB LED device now attached\n");
return 0;
error:
kfree(dev);
return retval;
}
static void led_disconnect(struct usb_interface *interface)
{
struct usb_led *dev;
dev = usb_get_intfdata (interface);
usb_set_intfdata (interface, NULL);
device_remove_file(&interface->dev, &dev_attr_blue);
device_remove_file(&interface->dev, &dev_attr_red);
device_remove_file(&interface->dev, &dev_attr_green);
usb_put_dev(dev->udev);
kfree(dev);
dev_info(&interface->dev, "USB LED now disconnected\n");
}
static struct usb_driver led_driver = {
.name = "usbled",
.probe = led_probe,
.disconnect = led_disconnect,
.id_table = id_table,
};
static int __init usb_led_init(void)
{
int retval = 0;
retval = usb_register(&led_driver);
if (retval)
err("usb_register failed. Error number %d", retval);
return retval;
}
static void __exit usb_led_exit(void)
{
usb_deregister(&led_driver);
}
module_init (usb_led_init);
module_exit (usb_led_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
|
