1 /*
2 * HID driver for some samsung "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 * Samsung IrDA remote controller (reports as Cypress USB Mouse).
27 *
28 * Vendor specific report #4 has a size of 48 bit,
29 * and therefore is not accepted when inspecting the descriptors.
30 * As a workaround we reinterpret the report as:
31 * Variable type, count 6, size 8 bit, log. maximum 255
32 * The burden to reconstruct the data is moved into user space.
33 */
34 static void samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc,
35 unsigned int rsize)
36 {
37 if (rsize >= 182 && rdesc[175] == 0x25 && rdesc[176] == 0x40 &&
38 rdesc[177] == 0x75 && rdesc[178] == 0x30 &&
39 rdesc[179] == 0x95 && rdesc[180] == 0x01 &&
40 rdesc[182] == 0x40) {
41 dev_info(&hdev->dev, "fixing up Samsung IrDA report "
42 "descriptor\n");
43 rdesc[176] = 0xff;
44 rdesc[178] = 0x08;
45 rdesc[180] = 0x06;
46 rdesc[182] = 0x42;
47 }
48 }
49
50 static int samsung_probe(struct hid_device *hdev,
51 const struct hid_device_id *id)
52 {
53 int ret;
54
55 ret = hid_parse(hdev);
56 if (ret) {
57 dev_err(&hdev->dev, "parse failed\n");
58 goto err_free;
59 }
60
61 ret = hid_hw_start(hdev, (HID_CONNECT_DEFAULT & ~HID_CONNECT_HIDINPUT) |
62 HID_CONNECT_HIDDEV_FORCE);
63 if (ret) {
64 dev_err(&hdev->dev, "hw start failed\n");
65 goto err_free;
66 }
67
68 return 0;
69 err_free:
70 return ret;
71 }
72
73 static const struct hid_device_id samsung_devices[] = {
74 { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
75 { }
76 };
77 MODULE_DEVICE_TABLE(hid, samsung_devices);
78
79 static struct hid_driver samsung_driver = {
80 .name = "samsung",
81 .id_table = samsung_devices,
82 .report_fixup = samsung_report_fixup,
83 .probe = samsung_probe,
84 };
85
86 static int samsung_init(void)
87 {
88 return hid_register_driver(&samsung_driver);
89 }
90
91 static void samsung_exit(void)
92 {
93 hid_unregister_driver(&samsung_driver);
94 }
95
96 module_init(samsung_init);
97 module_exit(samsung_exit);
98 MODULE_LICENSE("GPL");
99
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