drivers/hid/hid-speedlink.c

   1 /*
   2  *  HID driver for Speedlink Vicious and Divine Cezanne (USB mouse).
   3  *  Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from
   4  *  the HID descriptor.
   5  *
   6  *  Copyright (c) 2011 Stefan Kriwanek <mail@stefankriwanek.de>
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  */
  15
  16 #include <linux/device.h>
  17 #include <linux/hid.h>
  18 #include <linux/module.h>
  19 #include <linux/usb.h>
  20
  21 #include "hid-ids.h"
  22 #include "usbhid/usbhid.h"
  23
  24 static const struct hid_device_id speedlink_devices[] = {
  25         { HID_USB_DEVICE(USB_VENDOR_ID_X_TENSIONS, USB_DEVICE_ID_SPEEDLINK_VAD_CEZANNE)},
  26         { }
  27 };
  28
  29 static int speedlink_input_mapping(struct hid_device *hdev,
  30                 struct hid_input *hi,
  31                 struct hid_field *field, struct hid_usage *usage,
  32                 unsigned long **bit, int *max)
  33 {
  34         /*
  35          * The Cezanne mouse has a second "keyboard" USB endpoint for it is
  36          * able to map keyboard events to the button presses.
  37          * It sends a standard keyboard report descriptor, though, whose
  38          * LEDs we ignore.
  39          */
  40         switch (usage->hid & HID_USAGE_PAGE) {
  41         case HID_UP_LED:
  42                 return -1;
  43         }
  44         return 0;
  45 }
  46
  47 static int speedlink_event(struct hid_device *hdev, struct hid_field *field,
  48                 struct hid_usage *usage, __s32 value)
  49 {
  50         /* No other conditions due to usage_table. */
  51         /* Fix "jumpy" cursor (invalid events sent by device). */
  52         if (value == 256)
  53                 return 1;
  54         /* Drop useless distance 0 events (on button clicks etc.) as well */
  55         if (value == 0)
  56                 return 1;
  57
  58         return 0;
  59 }
  60
  61 MODULE_DEVICE_TABLE(hid, speedlink_devices);
  62
  63 static const struct hid_usage_id speedlink_grabbed_usages[] = {
  64         { HID_GD_X, EV_REL, 0 },
  65         { HID_GD_Y, EV_REL, 1 },
  66         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
  67 };
  68
  69 static struct hid_driver speedlink_driver = {
  70         .name = "speedlink",
  71         .id_table = speedlink_devices,
  72         .usage_table = speedlink_grabbed_usages,
  73         .input_mapping = speedlink_input_mapping,
  74         .event = speedlink_event,
  75 };
  76
  77 static int __init speedlink_init(void)
  78 {
  79         return hid_register_driver(&speedlink_driver);
  80 }
  81
  82 static void __exit speedlink_exit(void)
  83 {
  84         hid_unregister_driver(&speedlink_driver);
  85 }
  86
  87 module_init(speedlink_init);
  88 module_exit(speedlink_exit);
  89 MODULE_LICENSE("GPL");