Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 6e1a4a4fc0c109f7bf60083963d8c239a10939cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 * HID driver for Holtek keyboard
 * Copyright (c) 2012 Tom Harwood
*/

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "hid-ids.h"
#include "usbhid/usbhid.h"

/* Holtek based keyboards (USB ID 04d9:a055) have the following issues:
 * - The report descriptor specifies an excessively large number of consumer
 *   usages (2^15), which is more than HID_MAX_USAGES. This prevents proper
 *   parsing of the report descriptor.
 * - The report descriptor reports on caps/scroll/num lock key presses, but
 *   doesn't have an LED output usage block.
 *
 * The replacement descriptor below fixes the number of consumer usages,
 * and provides an LED output usage block. LED output events are redirected
 * to the boot interface.
 */

static __u8 holtek_kbd_rdesc_fixed[] = {
	/* Original report descriptor, with reduced number of consumer usages */
	0x05, 0x01,         /*  Usage Page (Desktop),                         */
	0x09, 0x80,         /*  Usage (Sys Control),                          */
	0xA1, 0x01,         /*  Collection (Application),                     */
	0x85, 0x01,         /*      Report ID (1),                            */
	0x19, 0x81,         /*      Usage Minimum (Sys Power Down),           */
	0x29, 0x83,         /*      Usage Maximum (Sys Wake Up),              */
	0x15, 0x00,         /*      Logical Minimum (0),                      */
	0x25, 0x01,         /*      Logical Maximum (1),                      */
	0x95, 0x03,         /*      Report Count (3),                         */
	0x75, 0x01,         /*      Report Size (1),                          */
	0x81, 0x02,         /*      Input (Variable),                         */
	0x95, 0x01,         /*      Report Count (1),                         */
	0x75, 0x05,         /*      Report Size (5),                          */
	0x81, 0x01,         /*      Input (Constant),                         */
	0xC0,               /*  End Collection,                               */
	0x05, 0x0C,         /*  Usage Page (Consumer),                        */
	0x09, 0x01,         /*  Usage (Consumer Control),                     */
	0xA1, 0x01,         /*  Collection (Application),                     */
	0x85, 0x02,         /*      Report ID (2),                            */
	0x19, 0x00,         /*      Usage Minimum (00h),                      */
	0x2A, 0xFF, 0x2F,   /*      Usage Maximum (0x2FFF), previously 0x7FFF */
	0x15, 0x00,         /*      Logical Minimum (0),                      */
	0x26, 0xFF, 0x2F,   /*      Logical Maximum (0x2FFF),previously 0x7FFF*/
	0x95, 0x01,         /*      Report Count (1),                         */
	0x75, 0x10,         /*      Report Size (16),                         */
	0x81, 0x00,         /*      Input,                                    */
	0xC0,               /*  End Collection,                               */
	0x05, 0x01,         /*  Usage Page (Desktop),                         */
	0x09, 0x06,         /*  Usage (Keyboard),                             */
	0xA1, 0x01,         /*  Collection (Application),                     */
	0x85, 0x03,         /*      Report ID (3),                            */
	0x95, 0x38,         /*      Report Count (56),                        */
	0x75, 0x01,         /*      Report Size (1),                          */
	0x15, 0x00,         /*      Logical Minimum (0),                      */
	0x25, 0x01,         /*      Logical Maximum (1),                      */
	0x05, 0x07,         /*      Usage Page (Keyboard),                    */
	0x19, 0xE0,         /*      Usage Minimum (KB Leftcontrol),           */
	0x29, 0xE7,         /*      Usage Maximum (KB Right GUI),             */
	0x19, 0x00,         /*      Usage Minimum (None),                     */
	0x29, 0x2F,         /*      Usage Maximum (KB Lboxbracket And Lbrace),*/
	0x81, 0x02,         /*      Input (Variable),                         */
	0xC0,               /*  End Collection,                               */
	0x05, 0x01,         /*  Usage Page (Desktop),                         */
	0x09, 0x06,         /*  Usage (Keyboard),                             */
	0xA1, 0x01,         /*  Collection (Application),                     */
	0x85, 0x04,         /*      Report ID (4),                            */
	0x95, 0x38,         /*      Report Count (56),                        */
	0x75, 0x01,         /*      Report Size (1),                          */
	0x15, 0x00,         /*      Logical Minimum (0),                      */
	0x25, 0x01,         /*      Logical Maximum (1),                      */
	0x05, 0x07,         /*      Usage Page (Keyboard),                    */
	0x19, 0x30,         /*      Usage Minimum (KB Rboxbracket And Rbrace),*/
	0x29, 0x67,         /*      Usage Maximum (KP Equals),                */
	0x81, 0x02,         /*      Input (Variable),                         */
	0xC0,               /*  End Collection                                */

	/* LED usage for the boot protocol interface */
	0x05, 0x01,         /*  Usage Page (Desktop),                         */
	0x09, 0x06,         /*  Usage (Keyboard),                             */
	0xA1, 0x01,         /*  Collection (Application),                     */
	0x05, 0x08,         /*      Usage Page (LED),                         */
	0x19, 0x01,         /*      Usage Minimum (01h),                      */
	0x29, 0x03,         /*      Usage Maximum (03h),                      */
	0x15, 0x00,         /*      Logical Minimum (0),                      */
	0x25, 0x01,         /*      Logical Maximum (1),                      */
	0x75, 0x01,         /*      Report Size (1),                          */
	0x95, 0x03,         /*      Report Count (3),                         */
	0x91, 0x02,         /*      Output (Variable),                        */
	0x95, 0x05,         /*      Report Count (5),                         */
	0x91, 0x01,         /*      Output (Constant),                        */
	0xC0,               /*  End Collection                                */
};

static __u8 *holtek_kbd_report_fixup(struct hid_device *hdev, __u8 *rdesc,
		unsigned int *rsize)
{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
		rdesc = holtek_kbd_rdesc_fixed;
		*rsize = sizeof(holtek_kbd_rdesc_fixed);
	}
	return rdesc;
}

static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type,
		unsigned int code,
		int value)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct usb_device *usb_dev = hid_to_usb_dev(hid);

	/* Locate the boot interface, to receive the LED change events */
	struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0);

	struct hid_device *boot_hid = usb_get_intfdata(boot_interface);
	struct hid_input *boot_hid_input = list_first_entry(&boot_hid->inputs,
		struct hid_input, list);

	return boot_hid_input->input->event(boot_hid_input->input, type, code,
			value);
}

static int holtek_kbd_probe(struct hid_device *hdev,
		const struct hid_device_id *id)
{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	int ret = hid_parse(hdev);

	if (!ret)
		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

	if (!ret && intf->cur_altsetting->desc.bInterfaceNumber == 1) {
		struct hid_input *hidinput;
		list_for_each_entry(hidinput, &hdev->inputs, list) {
			hidinput->input->event = holtek_kbd_input_event;
		}
	}

	return ret;
}

static const struct hid_device_id holtek_kbd_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
			USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) },
	{ }
};
MODULE_DEVICE_TABLE(hid, holtek_kbd_devices);

static struct hid_driver holtek_kbd_driver = {
	.name = "holtek_kbd",
	.id_table = holtek_kbd_devices,
	.report_fixup = holtek_kbd_report_fixup,
	.probe = holtek_kbd_probe
};
module_hid_driver(holtek_kbd_driver);

MODULE_LICENSE("GPL");