tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * USB LED driver - 1.1
3 *
4 * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/usb.h>
18
19
20#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com"
21#define DRIVER_DESC "USB LED Driver"
22
23#define VENDOR_ID 0x0fc5
24#define PRODUCT_ID 0x1223
25
26/* table of devices that work with this driver */
27static struct usb_device_id id_table [] = {
28 { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
29 { },
30};
31MODULE_DEVICE_TABLE (usb, id_table);
32
33struct usb_led {
34 struct usb_device * udev;
35 unsigned char blue;
36 unsigned char red;
37 unsigned char green;
38};
39
40#define BLUE 0x04
41#define RED 0x02
42#define GREEN 0x01
43static void change_color(struct usb_led *led)
44{
45 int retval;
46 unsigned char color = 0x07;
47 unsigned char *buffer;
48
49 buffer = kmalloc(8, GFP_KERNEL);
50 if (!buffer) {
51 dev_err(&led->udev->dev, "out of memory\n");
52 return;
53 }
54
55 if (led->blue)
56 color &= ~(BLUE);
57 if (led->red)
58 color &= ~(RED);
59 if (led->green)
60 color &= ~(GREEN);
61 dev_dbg(&led->udev->dev,
62 "blue = %d, red = %d, green = %d, color = %.2x\n",
63 led->blue, led->red, led->green, color);
64
65 retval = usb_control_msg(led->udev,
66 usb_sndctrlpipe(led->udev, 0),
67 0x12,
68 0xc8,
69 (0x02 * 0x100) + 0x0a,
70 (0x00 * 0x100) + color,
71 buffer,
72 8,
73 2000);
74 if (retval)
75 dev_dbg(&led->udev->dev, "retval = %d\n", retval);
76 kfree(buffer);
77}
78
79#define show_set(value) \
80static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
81{ \
82 struct usb_interface *intf = to_usb_interface(dev); \
83 struct usb_led *led = usb_get_intfdata(intf); \
84 \
85 return sprintf(buf, "%d\n", led->value); \
86} \
87static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
88{ \
89 struct usb_interface *intf = to_usb_interface(dev); \
90 struct usb_led *led = usb_get_intfdata(intf); \
91 int temp = simple_strtoul(buf, NULL, 10); \
92 \
93 led->value = temp; \
94 change_color(led); \
95 return count; \
96} \
97static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##value);
98show_set(blue);
99show_set(red);
100show_set(green);
101
102static int led_probe(struct usb_interface *interface, const struct usb_device_id *id)
103{
104 struct usb_device *udev = interface_to_usbdev(interface);
105 struct usb_led *dev = NULL;
106 int retval = -ENOMEM;
107
108 dev = kzalloc(sizeof(struct usb_led), GFP_KERNEL);
109 if (dev == NULL) {
110 dev_err(&interface->dev, "Out of memory\n");
111 goto error;
112 }
113
114 dev->udev = usb_get_dev(udev);
115
116 usb_set_intfdata (interface, dev);
117
118 device_create_file(&interface->dev, &dev_attr_blue);
119 device_create_file(&interface->dev, &dev_attr_red);
120 device_create_file(&interface->dev, &dev_attr_green);
121
122 dev_info(&interface->dev, "USB LED device now attached\n");
123 return 0;
124
125error:
126 kfree(dev);
127 return retval;
128}
129
130static void led_disconnect(struct usb_interface *interface)
131{
132 struct usb_led *dev;
133
134 dev = usb_get_intfdata (interface);
135 usb_set_intfdata (interface, NULL);
136
137 device_remove_file(&interface->dev, &dev_attr_blue);
138 device_remove_file(&interface->dev, &dev_attr_red);
139 device_remove_file(&interface->dev, &dev_attr_green);
140
141 usb_put_dev(dev->udev);
142
143 kfree(dev);
144
145 dev_info(&interface->dev, "USB LED now disconnected\n");
146}
147
148static struct usb_driver led_driver = {
149 .name = "usbled",
150 .probe = led_probe,
151 .disconnect = led_disconnect,
152 .id_table = id_table,
153};
154
155static int __init usb_led_init(void)
156{
157 int retval = 0;
158
159 retval = usb_register(&led_driver);
160 if (retval)
161 err("usb_register failed. Error number %d", retval);
162 return retval;
163}
164
165static void __exit usb_led_exit(void)
166{
167 usb_deregister(&led_driver);
168}
169
170module_init (usb_led_init);
171module_exit (usb_led_exit);
172
173MODULE_AUTHOR(DRIVER_AUTHOR);
174MODULE_DESCRIPTION(DRIVER_DESC);
175MODULE_LICENSE("GPL");