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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * HID driver for some ITE "special" devices
4 * Copyright (c) 2017 Hans de Goede <[email protected]>
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
16static const __u8 *ite_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize)
17{
18
19 const struct hid_device_id *id = hid_get_drvdata(hdev);
20 unsigned long quirks = id->driver_data;
21
22 if (quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) {
23 /* For Acer Aspire Switch 10 SW5-012 keyboard-dock */
24 if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
25 hid_info(hdev, "Fixing up Acer Sw5-012 ITE keyboard report descriptor\n");
26 rdesc[163] = HID_MAIN_ITEM_RELATIVE;
27 }
28 /* For Acer One S1002/S1003 keyboard-dock */
29 if (*rsize == 188 && rdesc[185] == 0x81 && rdesc[186] == 0x02) {
30 hid_info(hdev, "Fixing up Acer S1002/S1003 ITE keyboard report descriptor\n");
31 rdesc[186] = HID_MAIN_ITEM_RELATIVE;
32 }
33 /* For Acer Aspire Switch 10E (SW3-016) keyboard-dock */
34 if (*rsize == 210 && rdesc[184] == 0x81 && rdesc[185] == 0x02) {
35 hid_info(hdev, "Fixing up Acer Aspire Switch 10E (SW3-016) ITE keyboard report descriptor\n");
36 rdesc[185] = HID_MAIN_ITEM_RELATIVE;
37 }
38 }
39
40 return rdesc;
41}
42
43static int ite_input_mapping(struct hid_device *hdev,
44 struct hid_input *hi, struct hid_field *field,
45 struct hid_usage *usage, unsigned long **bit,
46 int *max)
47{
48
49 const struct hid_device_id *id = hid_get_drvdata(hdev);
50 unsigned long quirks = id->driver_data;
51
52 if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
53 (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
54 if (usage->hid == 0x00880078) {
55 /* Touchpad on, userspace expects F22 for this */
56 hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
57 return 1;
58 }
59 if (usage->hid == 0x00880079) {
60 /* Touchpad off, userspace expects F23 for this */
61 hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
62 return 1;
63 }
64 return -1;
65 }
66
67 return 0;
68}
69
70static int ite_event(struct hid_device *hdev, struct hid_field *field,
71 struct hid_usage *usage, __s32 value)
72{
73 struct input_dev *input;
74
75 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
76 return 0;
77
78 input = field->hidinput->input;
79
80 /*
81 * The ITE8595 always reports 0 as value for the rfkill button. Luckily
82 * it is the only button in its report, and it sends a report on
83 * release only, so receiving a report means the button was pressed.
84 */
85 if (usage->hid == HID_GD_RFKILL_BTN) {
86 input_event(input, EV_KEY, KEY_RFKILL, 1);
87 input_sync(input);
88 input_event(input, EV_KEY, KEY_RFKILL, 0);
89 input_sync(input);
90 return 1;
91 }
92
93 return 0;
94}
95
96static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
97{
98 int ret;
99
100 hid_set_drvdata(hdev, (void *)id);
101
102 ret = hid_open_report(hdev);
103 if (ret)
104 return ret;
105
106 return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
107}
108
109static const struct hid_device_id ite_devices[] = {
110 { HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
111 { HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
112 /* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
113 { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
114 USB_VENDOR_ID_SYNAPTICS,
115 USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
116 .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
117 /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
118 { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
119 USB_VENDOR_ID_SYNAPTICS,
120 USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1002),
121 .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
122 /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
123 { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
124 USB_VENDOR_ID_SYNAPTICS,
125 USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003),
126 .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
127 /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
128 { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
129 USB_VENDOR_ID_SYNAPTICS,
130 USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_017),
131 .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
132 { }
133};
134MODULE_DEVICE_TABLE(hid, ite_devices);
135
136static struct hid_driver ite_driver = {
137 .name = "itetech",
138 .id_table = ite_devices,
139 .probe = ite_probe,
140 .report_fixup = ite_report_fixup,
141 .input_mapping = ite_input_mapping,
142 .event = ite_event,
143};
144module_hid_driver(ite_driver);
145
146MODULE_AUTHOR("Hans de Goede <[email protected]>");
147MODULE_DESCRIPTION("HID driver for some ITE \"special\" devices");
148MODULE_LICENSE("GPL");