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/S1003 keyboard-dock */
  27                 if (*rsize == 188 && rdesc[185] == 0x81 && rdesc[186] == 0x02) {
  28                         hid_info(hdev, "Fixing up Acer S1002/S1003 ITE keyboard report descriptor\n");
  29                         rdesc[186] = HID_MAIN_ITEM_RELATIVE;
  30                 }
  31                 /* For Acer Aspire Switch 10E (SW3-016) keyboard-dock */
  32                 if (*rsize == 210 && rdesc[184] == 0x81 && rdesc[185] == 0x02) {
  33                         hid_info(hdev, "Fixing up Acer Aspire Switch 10E (SW3-016) ITE keyboard report descriptor\n");
  34                         rdesc[185] = HID_MAIN_ITEM_RELATIVE;
  35                 }
  36         }
  37
  38         return rdesc;
  39 }
  40
  41 static int ite_input_mapping(struct hid_device *hdev,
  42                 struct hid_input *hi, struct hid_field *field,
  43                 struct hid_usage *usage, unsigned long **bit,
  44                 int *max)
  45 {
  46
  47         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  48
  49         if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
  50             (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
  51                 if (usage->hid == 0x00880078) {
  52                         /* Touchpad on, userspace expects F22 for this */
  53                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
  54                         return 1;
  55                 }
  56                 if (usage->hid == 0x00880079) {
  57                         /* Touchpad off, userspace expects F23 for this */
  58                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
  59                         return 1;
  60                 }
  61                 return -1;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int ite_event(struct hid_device *hdev, struct hid_field *field,
  68                      struct hid_usage *usage, __s32 value)
  69 {
  70         struct input_dev *input;
  71
  72         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  73                 return 0;
  74
  75         input = field->hidinput->input;
  76
  77         /*
  78          * The ITE8595 always reports 0 as value for the rfkill button. Luckily
  79          * it is the only button in its report, and it sends a report on
  80          * release only, so receiving a report means the button was pressed.
  81          */
  82         if (usage->hid == HID_GD_RFKILL_BTN) {
  83                 input_event(input, EV_KEY, KEY_RFKILL, 1);
  84                 input_sync(input);
  85                 input_event(input, EV_KEY, KEY_RFKILL, 0);
  86                 input_sync(input);
  87                 return 1;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
  94 {
  95         int ret;
  96
  97         hid_set_drvdata(hdev, (void *)id->driver_data);
  98
  99         ret = hid_open_report(hdev);
 100         if (ret)
 101                 return ret;
 102
 103         return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 104 }
 105
 106 static const struct hid_device_id ite_devices[] = {
 107         { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
 108         { HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
 109         /* ITE8595 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_SWITCH5_012),
 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_S1002),
 118           .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
 119         /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
 120         { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
 121                      USB_VENDOR_ID_SYNAPTICS,
 122                      USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003),
 123           .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
 124         { }
 125 };
 126 MODULE_DEVICE_TABLE(hid, ite_devices);
 127
 128 static struct hid_driver ite_driver = {
 129         .name = "itetech",
 130         .id_table = ite_devices,
 131         .probe = ite_probe,
 132         .report_fixup = ite_report_fixup,
 133         .input_mapping = ite_input_mapping,
 134         .event = ite_event,
 135 };
 136 module_hid_driver(ite_driver);
 137
 138 MODULE_LICENSE("GPL");