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1da177e4 LT |
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 | ||
1da177e4 LT |
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 */ | |
27 | static struct usb_device_id id_table [] = { | |
28 | { USB_DEVICE(VENDOR_ID, PRODUCT_ID) }, | |
29 | { }, | |
30 | }; | |
31 | MODULE_DEVICE_TABLE (usb, id_table); | |
32 | ||
33 | struct 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 | |
43 | static 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) \ | |
060b8845 | 80 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
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 | } \ | |
060b8845 | 87 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ |
1da177e4 LT |
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 | } \ | |
97 | static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##value); | |
98 | show_set(blue); | |
99 | show_set(red); | |
100 | show_set(green); | |
101 | ||
102 | static 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 | ||
06d69474 | 108 | dev = kzalloc(sizeof(struct usb_led), GFP_KERNEL); |
1da177e4 LT |
109 | if (dev == NULL) { |
110 | dev_err(&interface->dev, "Out of memory\n"); | |
4d42e1bb | 111 | goto error_mem; |
1da177e4 | 112 | } |
1da177e4 LT |
113 | |
114 | dev->udev = usb_get_dev(udev); | |
115 | ||
116 | usb_set_intfdata (interface, dev); | |
117 | ||
4d42e1bb GKH |
118 | retval = device_create_file(&interface->dev, &dev_attr_blue); |
119 | if (retval) | |
120 | goto error; | |
121 | retval = device_create_file(&interface->dev, &dev_attr_red); | |
122 | if (retval) | |
123 | goto error; | |
124 | retval = device_create_file(&interface->dev, &dev_attr_green); | |
125 | if (retval) | |
126 | goto error; | |
1da177e4 LT |
127 | |
128 | dev_info(&interface->dev, "USB LED device now attached\n"); | |
129 | return 0; | |
130 | ||
131 | error: | |
4d42e1bb GKH |
132 | device_remove_file(&interface->dev, &dev_attr_blue); |
133 | device_remove_file(&interface->dev, &dev_attr_red); | |
134 | device_remove_file(&interface->dev, &dev_attr_green); | |
135 | usb_set_intfdata (interface, NULL); | |
136 | usb_put_dev(dev->udev); | |
1da177e4 | 137 | kfree(dev); |
4d42e1bb | 138 | error_mem: |
1da177e4 LT |
139 | return retval; |
140 | } | |
141 | ||
142 | static void led_disconnect(struct usb_interface *interface) | |
143 | { | |
144 | struct usb_led *dev; | |
145 | ||
146 | dev = usb_get_intfdata (interface); | |
1da177e4 LT |
147 | |
148 | device_remove_file(&interface->dev, &dev_attr_blue); | |
149 | device_remove_file(&interface->dev, &dev_attr_red); | |
150 | device_remove_file(&interface->dev, &dev_attr_green); | |
151 | ||
ed206ec9 ON |
152 | /* first remove the files, then set the pointer to NULL */ |
153 | usb_set_intfdata (interface, NULL); | |
154 | ||
1da177e4 LT |
155 | usb_put_dev(dev->udev); |
156 | ||
157 | kfree(dev); | |
158 | ||
159 | dev_info(&interface->dev, "USB LED now disconnected\n"); | |
160 | } | |
161 | ||
162 | static struct usb_driver led_driver = { | |
1da177e4 LT |
163 | .name = "usbled", |
164 | .probe = led_probe, | |
165 | .disconnect = led_disconnect, | |
166 | .id_table = id_table, | |
167 | }; | |
168 | ||
169 | static int __init usb_led_init(void) | |
170 | { | |
171 | int retval = 0; | |
172 | ||
173 | retval = usb_register(&led_driver); | |
174 | if (retval) | |
175 | err("usb_register failed. Error number %d", retval); | |
176 | return retval; | |
177 | } | |
178 | ||
179 | static void __exit usb_led_exit(void) | |
180 | { | |
181 | usb_deregister(&led_driver); | |
182 | } | |
183 | ||
184 | module_init (usb_led_init); | |
185 | module_exit (usb_led_exit); | |
186 | ||
187 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
188 | MODULE_DESCRIPTION(DRIVER_DESC); | |
189 | MODULE_LICENSE("GPL"); |