Merge branch 'parisc-5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[linux-2.6-microblaze.git] / 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");