drivers/hid/hid-ite.c

   1 /*
   2  * HID driver for some ITE "special" devices
   3  * Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/input.h>
  12 #include <linux/hid.h>
  13 #include <linux/module.h>
  14
  15 #include "hid-ids.h"
  16
  17 static int ite_event(struct hid_device *hdev, struct hid_field *field,
  18                      struct hid_usage *usage, __s32 value)
  19 {
  20         struct input_dev *input;
  21
  22         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  23                 return 0;
  24
  25         input = field->hidinput->input;
  26
  27         /*
  28          * The ITE8595 always reports 0 as value for the rfkill button. Luckily
  29          * it is the only button in its report, and it sends a report on
  30          * release only, so receiving a report means the button was pressed.
  31          */
  32         if (usage->hid == HID_GD_RFKILL_BTN) {
  33                 input_event(input, EV_KEY, KEY_RFKILL, 1);
  34                 input_sync(input);
  35                 input_event(input, EV_KEY, KEY_RFKILL, 0);
  36                 input_sync(input);
  37                 return 1;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static const struct hid_device_id ite_devices[] = {
  44         { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
  45         { }
  46 };
  47 MODULE_DEVICE_TABLE(hid, ite_devices);
  48
  49 static struct hid_driver ite_driver = {
  50         .name = "itetech",
  51         .id_table = ite_devices,
  52         .event = ite_event,
  53 };
  54 module_hid_driver(ite_driver);
  55
  56 MODULE_LICENSE("GPL");