drivers/hid/hid-ite.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID driver for some ITE "special" devices
   4  * Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/input.h>
   9 #include <linux/hid.h>
  10 #include <linux/module.h>
  11
  12 #include "hid-ids.h"
  13
  14 static int ite_event(struct hid_device *hdev, struct hid_field *field,
  15                      struct hid_usage *usage, __s32 value)
  16 {
  17         struct input_dev *input;
  18
  19         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  20                 return 0;
  21
  22         input = field->hidinput->input;
  23
  24         /*
  25          * The ITE8595 always reports 0 as value for the rfkill button. Luckily
  26          * it is the only button in its report, and it sends a report on
  27          * release only, so receiving a report means the button was pressed.
  28          */
  29         if (usage->hid == HID_GD_RFKILL_BTN) {
  30                 input_event(input, EV_KEY, KEY_RFKILL, 1);
  31                 input_sync(input);
  32                 input_event(input, EV_KEY, KEY_RFKILL, 0);
  33                 input_sync(input);
  34                 return 1;
  35         }
  36
  37         return 0;
  38 }
  39
  40 static const struct hid_device_id ite_devices[] = {
  41         { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
  42         { HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
  43         /* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
  44         { HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS,
  45                          USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012) },
  46         { }
  47 };
  48 MODULE_DEVICE_TABLE(hid, ite_devices);
  49
  50 static struct hid_driver ite_driver = {
  51         .name = "itetech",
  52         .id_table = ite_devices,
  53         .event = ite_event,
  54 };
  55 module_hid_driver(ite_driver);
  56
  57 MODULE_LICENSE("GPL");