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/config.h>
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19
20
21#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com"
22#define DRIVER_DESC "USB LED Driver"
23
24#define VENDOR_ID 0x0fc5
25#define PRODUCT_ID 0x1223
26
27/* table of devices that work with this driver */
28static struct usb_device_id id_table [] = {
29 { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
30 { },
31};
32MODULE_DEVICE_TABLE (usb, id_table);
33
34struct usb_led {
35 struct usb_device * udev;
36 unsigned char blue;
37 unsigned char red;
38 unsigned char green;
39};
40
41#define BLUE 0x04
42#define RED 0x02
43#define GREEN 0x01
44static void change_color(struct usb_led *led)
45{
46 int retval;
47 unsigned char color = 0x07;
48 unsigned char *buffer;
49
50 buffer = kmalloc(8, GFP_KERNEL);
51 if (!buffer) {
52 dev_err(&led->udev->dev, "out of memory\n");
53 return;
54 }
55
56 if (led->blue)
57 color &= ~(BLUE);
58 if (led->red)
59 color &= ~(RED);
60 if (led->green)
61 color &= ~(GREEN);
62 dev_dbg(&led->udev->dev,
63 "blue = %d, red = %d, green = %d, color = %.2x\n",
64 led->blue, led->red, led->green, color);
65
66 retval = usb_control_msg(led->udev,
67 usb_sndctrlpipe(led->udev, 0),
68 0x12,
69 0xc8,
70 (0x02 * 0x100) + 0x0a,
71 (0x00 * 0x100) + color,
72 buffer,
73 8,
74 2000);
75 if (retval)
76 dev_dbg(&led->udev->dev, "retval = %d\n", retval);
77 kfree(buffer);
78}
79
80#define show_set(value) \
81static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
82{ \
83 struct usb_interface *intf = to_usb_interface(dev); \
84 struct usb_led *led = usb_get_intfdata(intf); \
85 \
86 return sprintf(buf, "%d\n", led->value); \
87} \
88static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
89{ \
90 struct usb_interface *intf = to_usb_interface(dev); \
91 struct usb_led *led = usb_get_intfdata(intf); \
92 int temp = simple_strtoul(buf, NULL, 10); \
93 \
94 led->value = temp; \
95 change_color(led); \
96 return count; \
97} \
98static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##value);
99show_set(blue);
100show_set(red);
101show_set(green);
102
103static int led_probe(struct usb_interface *interface, const struct usb_device_id *id)
104{
105 struct usb_device *udev = interface_to_usbdev(interface);
106 struct usb_led *dev = NULL;
107 int retval = -ENOMEM;
108
109 dev = kmalloc(sizeof(struct usb_led), GFP_KERNEL);
110 if (dev == NULL) {
111 dev_err(&interface->dev, "Out of memory\n");
112 goto error;
113 }
114 memset (dev, 0x00, sizeof (*dev));
115
116 dev->udev = usb_get_dev(udev);
117
118 usb_set_intfdata (interface, dev);
119
120 device_create_file(&interface->dev, &dev_attr_blue);
121 device_create_file(&interface->dev, &dev_attr_red);
122 device_create_file(&interface->dev, &dev_attr_green);
123
124 dev_info(&interface->dev, "USB LED device now attached\n");
125 return 0;
126
127error:
128 kfree(dev);
129 return retval;
130}
131
132static void led_disconnect(struct usb_interface *interface)
133{
134 struct usb_led *dev;
135
136 dev = usb_get_intfdata (interface);
137 usb_set_intfdata (interface, NULL);
138
139 device_remove_file(&interface->dev, &dev_attr_blue);
140 device_remove_file(&interface->dev, &dev_attr_red);
141 device_remove_file(&interface->dev, &dev_attr_green);
142
143 usb_put_dev(dev->udev);
144
145 kfree(dev);
146
147 dev_info(&interface->dev, "USB LED now disconnected\n");
148}
149
150static struct usb_driver led_driver = {
151 .owner = THIS_MODULE,
152 .name = "usbled",
153 .probe = led_probe,
154 .disconnect = led_disconnect,
155 .id_table = id_table,
156};
157
158static int __init usb_led_init(void)
159{
160 int retval = 0;
161
162 retval = usb_register(&led_driver);
163 if (retval)
164 err("usb_register failed. Error number %d", retval);
165 return retval;
166}
167
168static void __exit usb_led_exit(void)
169{
170 usb_deregister(&led_driver);
171}
172
173module_init (usb_led_init);
174module_exit (usb_led_exit);
175
176MODULE_AUTHOR(DRIVER_AUTHOR);
177MODULE_DESCRIPTION(DRIVER_DESC);
178MODULE_LICENSE("GPL");