/drivers/hid/hid-cherry.c

 1/*
 2 *  HID driver for some cherry "special" devices
 3 *
 4 *  Copyright (c) 1999 Andreas Gal
 5 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 6 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 7 *  Copyright (c) 2006-2007 Jiri Kosina
 8 *  Copyright (c) 2007 Paul Walmsley
 9 *  Copyright (c) 2008 Jiri Slaby
10 */
11
12/*
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
16 * any later version.
17 */
18
19#include <linux/device.h>
20#include <linux/hid.h>
21#include <linux/module.h>
22
23#include "hid-ids.h"
24
25/*
26 * Cherry Cymotion keyboard have an invalid HID report descriptor,
27 * that needs fixing before we can parse it.
28 */
29static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
30		unsigned int *rsize)
31{
32	if (*rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
33		hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
34		rdesc[11] = rdesc[16] = 0xff;
35		rdesc[12] = rdesc[17] = 0x03;
36	}
37	return rdesc;
38}
39
40#define ch_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
41					EV_KEY, (c))
42static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
43		struct hid_field *field, struct hid_usage *usage,
44		unsigned long **bit, int *max)
45{
46	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
47		return 0;
48
49	switch (usage->hid & HID_USAGE) {
50	case 0x301: ch_map_key_clear(KEY_PROG1);	break;
51	case 0x302: ch_map_key_clear(KEY_PROG2);	break;
52	case 0x303: ch_map_key_clear(KEY_PROG3);	break;
53	default:
54		return 0;
55	}
56
57	return 1;
58}
59
60static const struct hid_device_id ch_devices[] = {
61	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
62	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
63	{ }
64};
65MODULE_DEVICE_TABLE(hid, ch_devices);
66
67static struct hid_driver ch_driver = {
68	.name = "cherry",
69	.id_table = ch_devices,
70	.report_fixup = ch_report_fixup,
71	.input_mapping = ch_input_mapping,
72};
73
74static int __init ch_init(void)
75{
76	return hid_register_driver(&ch_driver);
77}
78
79static void __exit ch_exit(void)
80{
81	hid_unregister_driver(&ch_driver);
82}
83
84module_init(ch_init);
85module_exit(ch_exit);
86MODULE_LICENSE("GPL");