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                 /* For Acer Aspire Switch 10 SW5-012 keyboard-dock */
  22                 if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
  23                         hid_info(hdev, "Fixing up Acer Sw5-012 ITE keyboard report descriptor\n");
  24                         rdesc[163] = HID_MAIN_ITEM_RELATIVE;
  25                 }
  26                 /* For Acer One S1002 keyboard-dock */
  27                 if (*rsize == 188 && rdesc[185] == 0x81 && rdesc[186] == 0x02) {
  28                         hid_info(hdev, "Fixing up Acer S1002 ITE keyboard report descriptor\n");
  29                         rdesc[186] = HID_MAIN_ITEM_RELATIVE;
  30                 }
  31         }
  32
  33         return rdesc;
  34 }
  35
  36 static int ite_input_mapping(struct hid_device *hdev,
  37                 struct hid_input *hi, struct hid_field *field,
  38                 struct hid_usage *usage, unsigned long **bit,
  39                 int *max)
  40 {
  41
  42         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  43
  44         if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
  45             (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
  46                 if (usage->hid == 0x00880078) {
  47                         /* Touchpad on, userspace expects F22 for this */
  48                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
  49                         return 1;
  50                 }
  51                 if (usage->hid == 0x00880079) {
  52                         /* Touchpad off, userspace expects F23 for this */
  53                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
  54                         return 1;
  55                 }
  56                 return -1;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static int ite_event(struct hid_device *hdev, struct hid_field *field,
  63                      struct hid_usage *usage, __s32 value)
  64 {
  65         struct input_dev *input;
  66
  67         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  68                 return 0;
  69
  70         input = field->hidinput->input;
  71
  72         /*
  73          * The ITE8595 always reports 0 as value for the rfkill button. Luckily
  74          * it is the only button in its report, and it sends a report on
  75          * release only, so receiving a report means the button was pressed.
  76          */
  77         if (usage->hid == HID_GD_RFKILL_BTN) {
  78                 input_event(input, EV_KEY, KEY_RFKILL, 1);
  79                 input_sync(input);
  80                 input_event(input, EV_KEY, KEY_RFKILL, 0);
  81                 input_sync(input);
  82                 return 1;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
  89 {
  90         int ret;
  91
  92         hid_set_drvdata(hdev, (void *)id->driver_data);
  93
  94         ret = hid_open_report(hdev);
  95         if (ret)
  96                 return ret;
  97
  98         return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  99 }
 100
 101 static const struct hid_device_id ite_devices[] = {
 102         { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
 103         { HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
 104         /* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
 105         { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
 106                      USB_VENDOR_ID_SYNAPTICS,
 107                      USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
 108           .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
 109         /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
 110         { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
 111                      USB_VENDOR_ID_SYNAPTICS,
 112                      USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1002),
 113           .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
 114         /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
 115         { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
 116                      USB_VENDOR_ID_SYNAPTICS,
 117                      USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003) },
 118         { }
 119 };
 120 MODULE_DEVICE_TABLE(hid, ite_devices);
 121
 122 static struct hid_driver ite_driver = {
 123         .name = "itetech",
 124         .id_table = ite_devices,
 125         .probe = ite_probe,
 126         .report_fixup = ite_report_fixup,
 127         .input_mapping = ite_input_mapping,
 128         .event = ite_event,
 129 };
 130 module_hid_driver(ite_driver);
 131
 132 MODULE_LICENSE("GPL");