Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * USB LED driver
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
23enum led_type {
24 DELCOM_VISUAL_SIGNAL_INDICATOR,
25 DREAM_CHEEKY_WEBMAIL_NOTIFIER,
26};
27
28/* table of devices that work with this driver */
29static const struct usb_device_id id_table[] = {
30 { USB_DEVICE(0x0fc5, 0x1223),
31 .driver_info = DELCOM_VISUAL_SIGNAL_INDICATOR },
32 { USB_DEVICE(0x1d34, 0x0004),
33 .driver_info = DREAM_CHEEKY_WEBMAIL_NOTIFIER },
34 { USB_DEVICE(0x1d34, 0x000a),
35 .driver_info = DREAM_CHEEKY_WEBMAIL_NOTIFIER },
36 { },
37};
38MODULE_DEVICE_TABLE(usb, id_table);
39
40struct usb_led {
41 struct usb_device *udev;
42 unsigned char blue;
43 unsigned char red;
44 unsigned char green;
45 enum led_type type;
46};
47
48static void change_color(struct usb_led *led)
49{
50 int retval = 0;
51 unsigned char *buffer;
52
53 buffer = kmalloc(8, GFP_KERNEL);
54 if (!buffer) {
55 dev_err(&led->udev->dev, "out of memory\n");
56 return;
57 }
58
59 switch (led->type) {
60 case DELCOM_VISUAL_SIGNAL_INDICATOR: {
61 unsigned char color = 0x07;
62
63 if (led->blue)
64 color &= ~0x04;
65 if (led->red)
66 color &= ~0x02;
67 if (led->green)
68 color &= ~0x01;
69 dev_dbg(&led->udev->dev,
70 "blue = %d, red = %d, green = %d, color = %.2x\n",
71 led->blue, led->red, led->green, color);
72
73 retval = usb_control_msg(led->udev,
74 usb_sndctrlpipe(led->udev, 0),
75 0x12,
76 0xc8,
77 (0x02 * 0x100) + 0x0a,
78 (0x00 * 0x100) + color,
79 buffer,
80 8,
81 2000);
82 break;
83 }
84
85 case DREAM_CHEEKY_WEBMAIL_NOTIFIER:
86 dev_dbg(&led->udev->dev,
87 "red = %d, green = %d, blue = %d\n",
88 led->red, led->green, led->blue);
89
90 buffer[0] = led->red;
91 buffer[1] = led->green;
92 buffer[2] = led->blue;
93 buffer[3] = buffer[4] = buffer[5] = 0;
94 buffer[6] = 0x1a;
95 buffer[7] = 0x05;
96
97 retval = usb_control_msg(led->udev,
98 usb_sndctrlpipe(led->udev, 0),
99 0x09,
100 0x21,
101 0x200,
102 0,
103 buffer,
104 8,
105 2000);
106 break;
107
108 default:
109 dev_err(&led->udev->dev, "unknown device type %d\n", led->type);
110 }
111
112 if (retval)
113 dev_dbg(&led->udev->dev, "retval = %d\n", retval);
114 kfree(buffer);
115}
116
117#define show_set(value) \
118static ssize_t show_##value(struct device *dev, struct device_attribute *attr,\
119 char *buf) \
120{ \
121 struct usb_interface *intf = to_usb_interface(dev); \
122 struct usb_led *led = usb_get_intfdata(intf); \
123 \
124 return sprintf(buf, "%d\n", led->value); \
125} \
126static ssize_t set_##value(struct device *dev, struct device_attribute *attr,\
127 const char *buf, size_t count) \
128{ \
129 struct usb_interface *intf = to_usb_interface(dev); \
130 struct usb_led *led = usb_get_intfdata(intf); \
131 int temp = simple_strtoul(buf, NULL, 10); \
132 \
133 led->value = temp; \
134 change_color(led); \
135 return count; \
136} \
137static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, show_##value, set_##value);
138show_set(blue);
139show_set(red);
140show_set(green);
141
142static int led_probe(struct usb_interface *interface,
143 const struct usb_device_id *id)
144{
145 struct usb_device *udev = interface_to_usbdev(interface);
146 struct usb_led *dev = NULL;
147 int retval = -ENOMEM;
148
149 dev = kzalloc(sizeof(struct usb_led), GFP_KERNEL);
150 if (dev == NULL) {
151 dev_err(&interface->dev, "out of memory\n");
152 goto error_mem;
153 }
154
155 dev->udev = usb_get_dev(udev);
156 dev->type = id->driver_info;
157
158 usb_set_intfdata(interface, dev);
159
160 retval = device_create_file(&interface->dev, &dev_attr_blue);
161 if (retval)
162 goto error;
163 retval = device_create_file(&interface->dev, &dev_attr_red);
164 if (retval)
165 goto error;
166 retval = device_create_file(&interface->dev, &dev_attr_green);
167 if (retval)
168 goto error;
169
170 if (dev->type == DREAM_CHEEKY_WEBMAIL_NOTIFIER) {
171 unsigned char *enable;
172
173 enable = kmemdup("\x1f\x02\0\x5f\0\0\x1a\x03", 8, GFP_KERNEL);
174 if (!enable) {
175 dev_err(&interface->dev, "out of memory\n");
176 retval = -ENOMEM;
177 goto error;
178 }
179
180 retval = usb_control_msg(udev,
181 usb_sndctrlpipe(udev, 0),
182 0x09,
183 0x21,
184 0x200,
185 0,
186 enable,
187 8,
188 2000);
189
190 kfree(enable);
191 if (retval != 8)
192 goto error;
193 }
194
195 dev_info(&interface->dev, "USB LED device now attached\n");
196 return 0;
197
198error:
199 device_remove_file(&interface->dev, &dev_attr_blue);
200 device_remove_file(&interface->dev, &dev_attr_red);
201 device_remove_file(&interface->dev, &dev_attr_green);
202 usb_set_intfdata(interface, NULL);
203 usb_put_dev(dev->udev);
204 kfree(dev);
205error_mem:
206 return retval;
207}
208
209static void led_disconnect(struct usb_interface *interface)
210{
211 struct usb_led *dev;
212
213 dev = usb_get_intfdata(interface);
214
215 device_remove_file(&interface->dev, &dev_attr_blue);
216 device_remove_file(&interface->dev, &dev_attr_red);
217 device_remove_file(&interface->dev, &dev_attr_green);
218
219 /* first remove the files, then set the pointer to NULL */
220 usb_set_intfdata(interface, NULL);
221
222 usb_put_dev(dev->udev);
223
224 kfree(dev);
225
226 dev_info(&interface->dev, "USB LED now disconnected\n");
227}
228
229static struct usb_driver led_driver = {
230 .name = "usbled",
231 .probe = led_probe,
232 .disconnect = led_disconnect,
233 .id_table = id_table,
234};
235
236module_usb_driver(led_driver);
237
238MODULE_AUTHOR(DRIVER_AUTHOR);
239MODULE_DESCRIPTION(DRIVER_DESC);
240MODULE_LICENSE("GPL");