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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ff9bf5a2 TH |
2 | /* |
3 | * HID driver for Holtek keyboard | |
4 | * Copyright (c) 2012 Tom Harwood | |
5 | */ | |
6 | ||
7 | /* | |
ff9bf5a2 TH |
8 | */ |
9 | ||
10 | #include <linux/device.h> | |
11 | #include <linux/hid.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/usb.h> | |
14 | ||
15 | #include "hid-ids.h" | |
16 | #include "usbhid/usbhid.h" | |
17 | ||
18 | /* Holtek based keyboards (USB ID 04d9:a055) have the following issues: | |
19 | * - The report descriptor specifies an excessively large number of consumer | |
20 | * usages (2^15), which is more than HID_MAX_USAGES. This prevents proper | |
21 | * parsing of the report descriptor. | |
22 | * - The report descriptor reports on caps/scroll/num lock key presses, but | |
23 | * doesn't have an LED output usage block. | |
24 | * | |
25 | * The replacement descriptor below fixes the number of consumer usages, | |
26 | * and provides an LED output usage block. LED output events are redirected | |
27 | * to the boot interface. | |
28 | */ | |
29 | ||
30 | static __u8 holtek_kbd_rdesc_fixed[] = { | |
31 | /* Original report descriptor, with reduced number of consumer usages */ | |
32 | 0x05, 0x01, /* Usage Page (Desktop), */ | |
33 | 0x09, 0x80, /* Usage (Sys Control), */ | |
34 | 0xA1, 0x01, /* Collection (Application), */ | |
35 | 0x85, 0x01, /* Report ID (1), */ | |
36 | 0x19, 0x81, /* Usage Minimum (Sys Power Down), */ | |
37 | 0x29, 0x83, /* Usage Maximum (Sys Wake Up), */ | |
38 | 0x15, 0x00, /* Logical Minimum (0), */ | |
39 | 0x25, 0x01, /* Logical Maximum (1), */ | |
40 | 0x95, 0x03, /* Report Count (3), */ | |
41 | 0x75, 0x01, /* Report Size (1), */ | |
42 | 0x81, 0x02, /* Input (Variable), */ | |
43 | 0x95, 0x01, /* Report Count (1), */ | |
44 | 0x75, 0x05, /* Report Size (5), */ | |
45 | 0x81, 0x01, /* Input (Constant), */ | |
46 | 0xC0, /* End Collection, */ | |
47 | 0x05, 0x0C, /* Usage Page (Consumer), */ | |
48 | 0x09, 0x01, /* Usage (Consumer Control), */ | |
49 | 0xA1, 0x01, /* Collection (Application), */ | |
50 | 0x85, 0x02, /* Report ID (2), */ | |
51 | 0x19, 0x00, /* Usage Minimum (00h), */ | |
52 | 0x2A, 0xFF, 0x2F, /* Usage Maximum (0x2FFF), previously 0x7FFF */ | |
53 | 0x15, 0x00, /* Logical Minimum (0), */ | |
54 | 0x26, 0xFF, 0x2F, /* Logical Maximum (0x2FFF),previously 0x7FFF*/ | |
55 | 0x95, 0x01, /* Report Count (1), */ | |
56 | 0x75, 0x10, /* Report Size (16), */ | |
57 | 0x81, 0x00, /* Input, */ | |
58 | 0xC0, /* End Collection, */ | |
59 | 0x05, 0x01, /* Usage Page (Desktop), */ | |
60 | 0x09, 0x06, /* Usage (Keyboard), */ | |
61 | 0xA1, 0x01, /* Collection (Application), */ | |
62 | 0x85, 0x03, /* Report ID (3), */ | |
63 | 0x95, 0x38, /* Report Count (56), */ | |
64 | 0x75, 0x01, /* Report Size (1), */ | |
65 | 0x15, 0x00, /* Logical Minimum (0), */ | |
66 | 0x25, 0x01, /* Logical Maximum (1), */ | |
67 | 0x05, 0x07, /* Usage Page (Keyboard), */ | |
68 | 0x19, 0xE0, /* Usage Minimum (KB Leftcontrol), */ | |
69 | 0x29, 0xE7, /* Usage Maximum (KB Right GUI), */ | |
70 | 0x19, 0x00, /* Usage Minimum (None), */ | |
71 | 0x29, 0x2F, /* Usage Maximum (KB Lboxbracket And Lbrace),*/ | |
72 | 0x81, 0x02, /* Input (Variable), */ | |
73 | 0xC0, /* End Collection, */ | |
74 | 0x05, 0x01, /* Usage Page (Desktop), */ | |
75 | 0x09, 0x06, /* Usage (Keyboard), */ | |
76 | 0xA1, 0x01, /* Collection (Application), */ | |
77 | 0x85, 0x04, /* Report ID (4), */ | |
78 | 0x95, 0x38, /* Report Count (56), */ | |
79 | 0x75, 0x01, /* Report Size (1), */ | |
80 | 0x15, 0x00, /* Logical Minimum (0), */ | |
81 | 0x25, 0x01, /* Logical Maximum (1), */ | |
82 | 0x05, 0x07, /* Usage Page (Keyboard), */ | |
83 | 0x19, 0x30, /* Usage Minimum (KB Rboxbracket And Rbrace),*/ | |
84 | 0x29, 0x67, /* Usage Maximum (KP Equals), */ | |
85 | 0x81, 0x02, /* Input (Variable), */ | |
86 | 0xC0, /* End Collection */ | |
87 | ||
88 | /* LED usage for the boot protocol interface */ | |
89 | 0x05, 0x01, /* Usage Page (Desktop), */ | |
90 | 0x09, 0x06, /* Usage (Keyboard), */ | |
91 | 0xA1, 0x01, /* Collection (Application), */ | |
92 | 0x05, 0x08, /* Usage Page (LED), */ | |
93 | 0x19, 0x01, /* Usage Minimum (01h), */ | |
94 | 0x29, 0x03, /* Usage Maximum (03h), */ | |
95 | 0x15, 0x00, /* Logical Minimum (0), */ | |
96 | 0x25, 0x01, /* Logical Maximum (1), */ | |
97 | 0x75, 0x01, /* Report Size (1), */ | |
98 | 0x95, 0x03, /* Report Count (3), */ | |
99 | 0x91, 0x02, /* Output (Variable), */ | |
100 | 0x95, 0x05, /* Report Count (5), */ | |
101 | 0x91, 0x01, /* Output (Constant), */ | |
102 | 0xC0, /* End Collection */ | |
103 | }; | |
104 | ||
105 | static __u8 *holtek_kbd_report_fixup(struct hid_device *hdev, __u8 *rdesc, | |
106 | unsigned int *rsize) | |
107 | { | |
108 | struct usb_interface *intf = to_usb_interface(hdev->dev.parent); | |
109 | ||
110 | if (intf->cur_altsetting->desc.bInterfaceNumber == 1) { | |
111 | rdesc = holtek_kbd_rdesc_fixed; | |
112 | *rsize = sizeof(holtek_kbd_rdesc_fixed); | |
113 | } | |
114 | return rdesc; | |
115 | } | |
116 | ||
117 | static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type, | |
118 | unsigned int code, | |
119 | int value) | |
120 | { | |
121 | struct hid_device *hid = input_get_drvdata(dev); | |
122 | struct usb_device *usb_dev = hid_to_usb_dev(hid); | |
123 | ||
124 | /* Locate the boot interface, to receive the LED change events */ | |
125 | struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0); | |
126 | ||
127 | struct hid_device *boot_hid = usb_get_intfdata(boot_interface); | |
128 | struct hid_input *boot_hid_input = list_first_entry(&boot_hid->inputs, | |
129 | struct hid_input, list); | |
130 | ||
131 | return boot_hid_input->input->event(boot_hid_input->input, type, code, | |
132 | value); | |
133 | } | |
134 | ||
135 | static int holtek_kbd_probe(struct hid_device *hdev, | |
136 | const struct hid_device_id *id) | |
137 | { | |
138 | struct usb_interface *intf = to_usb_interface(hdev->dev.parent); | |
139 | int ret = hid_parse(hdev); | |
140 | ||
141 | if (!ret) | |
142 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
143 | ||
144 | if (!ret && intf->cur_altsetting->desc.bInterfaceNumber == 1) { | |
145 | struct hid_input *hidinput; | |
146 | list_for_each_entry(hidinput, &hdev->inputs, list) { | |
147 | hidinput->input->event = holtek_kbd_input_event; | |
148 | } | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static const struct hid_device_id holtek_kbd_devices[] = { | |
155 | { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT, | |
156 | USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) }, | |
157 | { } | |
158 | }; | |
159 | MODULE_DEVICE_TABLE(hid, holtek_kbd_devices); | |
160 | ||
161 | static struct hid_driver holtek_kbd_driver = { | |
162 | .name = "holtek_kbd", | |
163 | .id_table = holtek_kbd_devices, | |
164 | .report_fixup = holtek_kbd_report_fixup, | |
165 | .probe = holtek_kbd_probe | |
166 | }; | |
f425458e | 167 | module_hid_driver(holtek_kbd_driver); |
ff9bf5a2 | 168 | |
ff9bf5a2 | 169 | MODULE_LICENSE("GPL"); |