drivers/usb/misc/usbled.c

   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
  23 enum led_type {
  24         DELCOM_VISUAL_SIGNAL_INDICATOR,
  25         DREAM_CHEEKY_WEBMAIL_NOTIFIER,
  26 };
  27
  28 /* table of devices that work with this driver */
  29 static 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         { },
  35 };
  36 MODULE_DEVICE_TABLE(usb, id_table);
  37
  38 struct usb_led {
  39         struct usb_device       *udev;
  40         unsigned char           blue;
  41         unsigned char           red;
  42         unsigned char           green;
  43         enum led_type           type;
  44 };
  45
  46 static void change_color(struct usb_led *led)
  47 {
  48         int retval = 0;
  49         unsigned char *buffer;
  50
  51         buffer = kmalloc(8, GFP_KERNEL);
  52         if (!buffer) {
  53                 dev_err(&led->udev->dev, "out of memory\n");
  54                 return;
  55         }
  56
  57         switch (led->type) {
  58         case DELCOM_VISUAL_SIGNAL_INDICATOR: {
  59                 unsigned char color = 0x07;
  60
  61                 if (led->blue)
  62                         color &= ~0x04;
  63                 if (led->red)
  64                         color &= ~0x02;
  65                 if (led->green)
  66                         color &= ~0x01;
  67                 dev_dbg(&led->udev->dev,
  68                         "blue = %d, red = %d, green = %d, color = %.2x\n",
  69                         led->blue, led->red, led->green, color);
  70
  71                 retval = usb_control_msg(led->udev,
  72                                         usb_sndctrlpipe(led->udev, 0),
  73                                         0x12,
  74                                         0xc8,
  75                                         (0x02 * 0x100) + 0x0a,
  76                                         (0x00 * 0x100) + color,
  77                                         buffer,
  78                                         8,
  79                                         2000);
  80                 break;
  81         }
  82
  83         case DREAM_CHEEKY_WEBMAIL_NOTIFIER:
  84                 dev_dbg(&led->udev->dev,
  85                         "red = %d, green = %d, blue = %d\n",
  86                         led->red, led->green, led->blue);
  87
  88                 buffer[0] = led->red;
  89                 buffer[1] = led->green;
  90                 buffer[2] = led->blue;
  91                 buffer[3] = buffer[4] = buffer[5] = 0;
  92                 buffer[6] = 0x1a;
  93                 buffer[7] = 0x05;
  94
  95                 retval = usb_control_msg(led->udev,
  96                                         usb_sndctrlpipe(led->udev, 0),
  97                                         0x09,
  98                                         0x21,
  99                                         0x200,
 100                                         0,
 101                                         buffer,
 102                                         8,
 103                                         2000);
 104                 break;
 105
 106         default:
 107                 dev_err(&led->udev->dev, "unknown device type %d\n", led->type);
 108         }
 109
 110         if (retval)
 111                 dev_dbg(&led->udev->dev, "retval = %d\n", retval);
 112         kfree(buffer);
 113 }
 114
 115 #define show_set(value) \
 116 static ssize_t show_##value(struct device *dev, struct device_attribute *attr,\
 117                             char *buf)                                  \
 118 {                                                                       \
 119         struct usb_interface *intf = to_usb_interface(dev);             \
 120         struct usb_led *led = usb_get_intfdata(intf);                   \
 121                                                                         \
 122         return sprintf(buf, "%d\n", led->value);                        \
 123 }                                                                       \
 124 static ssize_t set_##value(struct device *dev, struct device_attribute *attr,\
 125                            const char *buf, size_t count)               \
 126 {                                                                       \
 127         struct usb_interface *intf = to_usb_interface(dev);             \
 128         struct usb_led *led = usb_get_intfdata(intf);                   \
 129         int temp = simple_strtoul(buf, NULL, 10);                       \
 130                                                                         \
 131         led->value = temp;                                              \
 132         change_color(led);                                              \
 133         return count;                                                   \
 134 }                                                                       \
 135 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, show_##value, set_##value);
 136 show_set(blue);
 137 show_set(red);
 138 show_set(green);
 139
 140 static int led_probe(struct usb_interface *interface,
 141                      const struct usb_device_id *id)
 142 {
 143         struct usb_device *udev = interface_to_usbdev(interface);
 144         struct usb_led *dev = NULL;
 145         int retval = -ENOMEM;
 146
 147         dev = kzalloc(sizeof(struct usb_led), GFP_KERNEL);
 148         if (dev == NULL) {
 149                 dev_err(&interface->dev, "out of memory\n");
 150                 goto error_mem;
 151         }
 152
 153         dev->udev = usb_get_dev(udev);
 154         dev->type = id->driver_info;
 155
 156         usb_set_intfdata(interface, dev);
 157
 158         retval = device_create_file(&interface->dev, &dev_attr_blue);
 159         if (retval)
 160                 goto error;
 161         retval = device_create_file(&interface->dev, &dev_attr_red);
 162         if (retval)
 163                 goto error;
 164         retval = device_create_file(&interface->dev, &dev_attr_green);
 165         if (retval)
 166                 goto error;
 167
 168         if (dev->type == DREAM_CHEEKY_WEBMAIL_NOTIFIER) {
 169                 unsigned char *enable;
 170
 171                 enable = kmemdup("\x1f\x02\0\x5f\0\0\x1a\x03", 8, GFP_KERNEL);
 172                 if (!enable) {
 173                         dev_err(&interface->dev, "out of memory\n");
 174                         retval = -ENOMEM;
 175                         goto error;
 176                 }
 177
 178                 retval = usb_control_msg(udev,
 179                                         usb_sndctrlpipe(udev, 0),
 180                                         0x09,
 181                                         0x21,
 182                                         0x200,
 183                                         0,
 184                                         enable,
 185                                         8,
 186                                         2000);
 187
 188                 kfree(enable);
 189                 if (retval != 8)
 190                         goto error;
 191         }
 192
 193         dev_info(&interface->dev, "USB LED device now attached\n");
 194         return 0;
 195
 196 error:
 197         device_remove_file(&interface->dev, &dev_attr_blue);
 198         device_remove_file(&interface->dev, &dev_attr_red);
 199         device_remove_file(&interface->dev, &dev_attr_green);
 200         usb_set_intfdata(interface, NULL);
 201         usb_put_dev(dev->udev);
 202         kfree(dev);
 203 error_mem:
 204         return retval;
 205 }
 206
 207 static void led_disconnect(struct usb_interface *interface)
 208 {
 209         struct usb_led *dev;
 210
 211         dev = usb_get_intfdata(interface);
 212
 213         device_remove_file(&interface->dev, &dev_attr_blue);
 214         device_remove_file(&interface->dev, &dev_attr_red);
 215         device_remove_file(&interface->dev, &dev_attr_green);
 216
 217         /* first remove the files, then set the pointer to NULL */
 218         usb_set_intfdata(interface, NULL);
 219
 220         usb_put_dev(dev->udev);
 221
 222         kfree(dev);
 223
 224         dev_info(&interface->dev, "USB LED now disconnected\n");
 225 }
 226
 227 static struct usb_driver led_driver = {
 228         .name =         "usbled",
 229         .probe =        led_probe,
 230         .disconnect =   led_disconnect,
 231         .id_table =     id_table,
 232 };
 233
 234 static int __init usb_led_init(void)
 235 {
 236         int retval = 0;
 237
 238         retval = usb_register(&led_driver);
 239         if (retval)
 240                 err("usb_register failed. Error number %d", retval);
 241         return retval;
 242 }
 243
 244 static void __exit usb_led_exit(void)
 245 {
 246         usb_deregister(&led_driver);
 247 }
 248
 249 module_init(usb_led_init);
 250 module_exit(usb_led_exit);
 251
 252 MODULE_AUTHOR(DRIVER_AUTHOR);
 253 MODULE_DESCRIPTION(DRIVER_DESC);
 254 MODULE_LICENSE("GPL");