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Linux/drivers/hid/hid-holtek-kbd.c

  1 /*
  2  * HID driver for Holtek keyboard
  3  * Copyright (c) 2012 Tom Harwood
  4 */
  5 
  6 /*
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License as published by the Free
  9  * Software Foundation; either version 2 of the License, or (at your option)
 10  * any later version.
 11  */
 12 
 13 #include <linux/device.h>
 14 #include <linux/hid.h>
 15 #include <linux/module.h>
 16 #include <linux/usb.h>
 17 
 18 #include "hid-ids.h"
 19 #include "usbhid/usbhid.h"
 20 
 21 /* Holtek based keyboards (USB ID 04d9:a055) have the following issues:
 22  * - The report descriptor specifies an excessively large number of consumer
 23  *   usages (2^15), which is more than HID_MAX_USAGES. This prevents proper
 24  *   parsing of the report descriptor.
 25  * - The report descriptor reports on caps/scroll/num lock key presses, but
 26  *   doesn't have an LED output usage block.
 27  *
 28  * The replacement descriptor below fixes the number of consumer usages,
 29  * and provides an LED output usage block. LED output events are redirected
 30  * to the boot interface.
 31  */
 32 
 33 static __u8 holtek_kbd_rdesc_fixed[] = {
 34         /* Original report descriptor, with reduced number of consumer usages */
 35         0x05, 0x01,         /*  Usage Page (Desktop),                         */
 36         0x09, 0x80,         /*  Usage (Sys Control),                          */
 37         0xA1, 0x01,         /*  Collection (Application),                     */
 38         0x85, 0x01,         /*      Report ID (1),                            */
 39         0x19, 0x81,         /*      Usage Minimum (Sys Power Down),           */
 40         0x29, 0x83,         /*      Usage Maximum (Sys Wake Up),              */
 41         0x15, 0x00,         /*      Logical Minimum (0),                      */
 42         0x25, 0x01,         /*      Logical Maximum (1),                      */
 43         0x95, 0x03,         /*      Report Count (3),                         */
 44         0x75, 0x01,         /*      Report Size (1),                          */
 45         0x81, 0x02,         /*      Input (Variable),                         */
 46         0x95, 0x01,         /*      Report Count (1),                         */
 47         0x75, 0x05,         /*      Report Size (5),                          */
 48         0x81, 0x01,         /*      Input (Constant),                         */
 49         0xC0,               /*  End Collection,                               */
 50         0x05, 0x0C,         /*  Usage Page (Consumer),                        */
 51         0x09, 0x01,         /*  Usage (Consumer Control),                     */
 52         0xA1, 0x01,         /*  Collection (Application),                     */
 53         0x85, 0x02,         /*      Report ID (2),                            */
 54         0x19, 0x00,         /*      Usage Minimum (00h),                      */
 55         0x2A, 0xFF, 0x2F,   /*      Usage Maximum (0x2FFF), previously 0x7FFF */
 56         0x15, 0x00,         /*      Logical Minimum (0),                      */
 57         0x26, 0xFF, 0x2F,   /*      Logical Maximum (0x2FFF),previously 0x7FFF*/
 58         0x95, 0x01,         /*      Report Count (1),                         */
 59         0x75, 0x10,         /*      Report Size (16),                         */
 60         0x81, 0x00,         /*      Input,                                    */
 61         0xC0,               /*  End Collection,                               */
 62         0x05, 0x01,         /*  Usage Page (Desktop),                         */
 63         0x09, 0x06,         /*  Usage (Keyboard),                             */
 64         0xA1, 0x01,         /*  Collection (Application),                     */
 65         0x85, 0x03,         /*      Report ID (3),                            */
 66         0x95, 0x38,         /*      Report Count (56),                        */
 67         0x75, 0x01,         /*      Report Size (1),                          */
 68         0x15, 0x00,         /*      Logical Minimum (0),                      */
 69         0x25, 0x01,         /*      Logical Maximum (1),                      */
 70         0x05, 0x07,         /*      Usage Page (Keyboard),                    */
 71         0x19, 0xE0,         /*      Usage Minimum (KB Leftcontrol),           */
 72         0x29, 0xE7,         /*      Usage Maximum (KB Right GUI),             */
 73         0x19, 0x00,         /*      Usage Minimum (None),                     */
 74         0x29, 0x2F,         /*      Usage Maximum (KB Lboxbracket And Lbrace),*/
 75         0x81, 0x02,         /*      Input (Variable),                         */
 76         0xC0,               /*  End Collection,                               */
 77         0x05, 0x01,         /*  Usage Page (Desktop),                         */
 78         0x09, 0x06,         /*  Usage (Keyboard),                             */
 79         0xA1, 0x01,         /*  Collection (Application),                     */
 80         0x85, 0x04,         /*      Report ID (4),                            */
 81         0x95, 0x38,         /*      Report Count (56),                        */
 82         0x75, 0x01,         /*      Report Size (1),                          */
 83         0x15, 0x00,         /*      Logical Minimum (0),                      */
 84         0x25, 0x01,         /*      Logical Maximum (1),                      */
 85         0x05, 0x07,         /*      Usage Page (Keyboard),                    */
 86         0x19, 0x30,         /*      Usage Minimum (KB Rboxbracket And Rbrace),*/
 87         0x29, 0x67,         /*      Usage Maximum (KP Equals),                */
 88         0x81, 0x02,         /*      Input (Variable),                         */
 89         0xC0,               /*  End Collection                                */
 90 
 91         /* LED usage for the boot protocol interface */
 92         0x05, 0x01,         /*  Usage Page (Desktop),                         */
 93         0x09, 0x06,         /*  Usage (Keyboard),                             */
 94         0xA1, 0x01,         /*  Collection (Application),                     */
 95         0x05, 0x08,         /*      Usage Page (LED),                         */
 96         0x19, 0x01,         /*      Usage Minimum (01h),                      */
 97         0x29, 0x03,         /*      Usage Maximum (03h),                      */
 98         0x15, 0x00,         /*      Logical Minimum (0),                      */
 99         0x25, 0x01,         /*      Logical Maximum (1),                      */
100         0x75, 0x01,         /*      Report Size (1),                          */
101         0x95, 0x03,         /*      Report Count (3),                         */
102         0x91, 0x02,         /*      Output (Variable),                        */
103         0x95, 0x05,         /*      Report Count (5),                         */
104         0x91, 0x01,         /*      Output (Constant),                        */
105         0xC0,               /*  End Collection                                */
106 };
107 
108 static __u8 *holtek_kbd_report_fixup(struct hid_device *hdev, __u8 *rdesc,
109                 unsigned int *rsize)
110 {
111         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
112 
113         if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
114                 rdesc = holtek_kbd_rdesc_fixed;
115                 *rsize = sizeof(holtek_kbd_rdesc_fixed);
116         }
117         return rdesc;
118 }
119 
120 static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type,
121                 unsigned int code,
122                 int value)
123 {
124         struct hid_device *hid = input_get_drvdata(dev);
125         struct usb_device *usb_dev = hid_to_usb_dev(hid);
126 
127         /* Locate the boot interface, to receive the LED change events */
128         struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0);
129 
130         struct hid_device *boot_hid = usb_get_intfdata(boot_interface);
131         struct hid_input *boot_hid_input = list_first_entry(&boot_hid->inputs,
132                 struct hid_input, list);
133 
134         return boot_hid_input->input->event(boot_hid_input->input, type, code,
135                         value);
136 }
137 
138 static int holtek_kbd_probe(struct hid_device *hdev,
139                 const struct hid_device_id *id)
140 {
141         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
142         int ret = hid_parse(hdev);
143 
144         if (!ret)
145                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
146 
147         if (!ret && intf->cur_altsetting->desc.bInterfaceNumber == 1) {
148                 struct hid_input *hidinput;
149                 list_for_each_entry(hidinput, &hdev->inputs, list) {
150                         hidinput->input->event = holtek_kbd_input_event;
151                 }
152         }
153 
154         return ret;
155 }
156 
157 static const struct hid_device_id holtek_kbd_devices[] = {
158         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
159                         USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) },
160         { }
161 };
162 MODULE_DEVICE_TABLE(hid, holtek_kbd_devices);
163 
164 static struct hid_driver holtek_kbd_driver = {
165         .name = "holtek_kbd",
166         .id_table = holtek_kbd_devices,
167         .report_fixup = holtek_kbd_report_fixup,
168         .probe = holtek_kbd_probe
169 };
170 module_hid_driver(holtek_kbd_driver);
171 
172 MODULE_LICENSE("GPL");
173 

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