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 #define QUIRK_TOUCHPAD_ON_OFF_REPORT            BIT(0)
  15
  16 static __u8 *ite_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize)
  17 {
  18         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  19
  20         if (quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) {
  21                 if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
  22                         hid_info(hdev, "Fixing up ITE keyboard report descriptor\n");
  23                         rdesc[163] = HID_MAIN_ITEM_RELATIVE;
  24                 }
  25         }
  26
  27         return rdesc;
  28 }
  29
  30 static int ite_input_mapping(struct hid_device *hdev,
  31                 struct hid_input *hi, struct hid_field *field,
  32                 struct hid_usage *usage, unsigned long **bit,
  33                 int *max)
  34 {
  35
  36         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  37
  38         if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
  39             (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
  40                 if (usage->hid == 0x00880078) {
  41                         /* Touchpad on, userspace expects F22 for this */
  42                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
  43                         return 1;
  44                 }
  45                 if (usage->hid == 0x00880079) {
  46                         /* Touchpad off, userspace expects F23 for this */
  47                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
  48                         return 1;
  49                 }
  50                 return -1;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int ite_event(struct hid_device *hdev, struct hid_field *field,
  57                      struct hid_usage *usage, __s32 value)
  58 {
  59         struct input_dev *input;
  60
  61         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  62                 return 0;
  63
  64         input = field->hidinput->input;
  65
  66         /*
  67          * The ITE8595 always reports 0 as value for the rfkill button. Luckily
  68          * it is the only button in its report, and it sends a report on
  69          * release only, so receiving a report means the button was pressed.
  70          */
  71         if (usage->hid == HID_GD_RFKILL_BTN) {
  72                 input_event(input, EV_KEY, KEY_RFKILL, 1);
  73                 input_sync(input);
  74                 input_event(input, EV_KEY, KEY_RFKILL, 0);
  75                 input_sync(input);
  76                 return 1;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
  83 {
  84         int ret;
  85
  86         hid_set_drvdata(hdev, (void *)id->driver_data);
  87
  88         ret = hid_open_report(hdev);
  89         if (ret)
  90                 return ret;
  91
  92         return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  93 }
  94
  95 static const struct hid_device_id ite_devices[] = {
  96         { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
  97         { HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
  98         /* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
  99         { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
 100                      USB_VENDOR_ID_SYNAPTICS,
 101                      USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
 102           .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
 103         /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
 104         { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
 105                      USB_VENDOR_ID_SYNAPTICS,
 106                      USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003) },
 107         { }
 108 };
 109 MODULE_DEVICE_TABLE(hid, ite_devices);
 110
 111 static struct hid_driver ite_driver = {
 112         .name = "itetech",
 113         .id_table = ite_devices,
 114         .probe = ite_probe,
 115         .report_fixup = ite_report_fixup,
 116         .input_mapping = ite_input_mapping,
 117         .event = ite_event,
 118 };
 119 module_hid_driver(ite_driver);
 120
 121 MODULE_LICENSE("GPL");