LXR linux/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
  17static 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
  43static const struct hid_device_id ite_devices[] = {
  44        { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
  45        { }
  46};
  47MODULE_DEVICE_TABLE(hid, ite_devices);
  48
  49static struct hid_driver ite_driver = {
  50        .name = "itetech",
  51        .id_table = ite_devices,
  52        .event = ite_event,
  53};
  54module_hid_driver(ite_driver);
  55
  56MODULE_LICENSE("GPL");
  57