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 */
ch_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)29 static __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))
ch_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)42 static 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
60 static 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 };
65 MODULE_DEVICE_TABLE(hid, ch_devices);
66
67 static 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
ch_init(void)74 static int __init ch_init(void)
75 {
76 return hid_register_driver(&ch_driver);
77 }
78
ch_exit(void)79 static void __exit ch_exit(void)
80 {
81 hid_unregister_driver(&ch_driver);
82 }
83
84 module_init(ch_init);
85 module_exit(ch_exit);
86 MODULE_LICENSE("GPL");
87