tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * There are several variants for 0419:0001:
29 *
30 * 1. 184 byte report descriptor
31 * Vendor specific report #4 has a size of 48 bit,
32 * and therefore is not accepted when inspecting the descriptors.
33 * As a workaround we reinterpret the report as:
34 * Variable type, count 6, size 8 bit, log. maximum 255
35 * The burden to reconstruct the data is moved into user space.
36 *
37 * 2. 203 byte report descriptor
38 * Report #4 has an array field with logical range 0..18 instead of 1..15.
39 *
40 * 3. 135 byte report descriptor
41 * Report #4 has an array field with logical range 0..17 instead of 1..14.
42 *
43 * 4. 171 byte report descriptor
44 * Report #3 has an array field with logical range 0..1 instead of 1..3.
45 */
46static inline void samsung_dev_trace(struct hid_device *hdev,
47 unsigned int rsize)
48{
49 dev_info(&hdev->dev, "fixing up Samsung IrDA %d byte report "
50 "descriptor\n", rsize);
51}
52
53static void samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc,
54 unsigned int rsize)
55{
56 if (rsize == 184 && rdesc[175] == 0x25 && rdesc[176] == 0x40 &&
57 rdesc[177] == 0x75 && rdesc[178] == 0x30 &&
58 rdesc[179] == 0x95 && rdesc[180] == 0x01 &&
59 rdesc[182] == 0x40) {
60 samsung_dev_trace(hdev, 184);
61 rdesc[176] = 0xff;
62 rdesc[178] = 0x08;
63 rdesc[180] = 0x06;
64 rdesc[182] = 0x42;
65 } else
66 if (rsize == 203 && rdesc[192] == 0x15 && rdesc[193] == 0x0 &&
67 rdesc[194] == 0x25 && rdesc[195] == 0x12) {
68 samsung_dev_trace(hdev, 203);
69 rdesc[193] = 0x1;
70 rdesc[195] = 0xf;
71 } else
72 if (rsize == 135 && rdesc[124] == 0x15 && rdesc[125] == 0x0 &&
73 rdesc[126] == 0x25 && rdesc[127] == 0x11) {
74 samsung_dev_trace(hdev, 135);
75 rdesc[125] = 0x1;
76 rdesc[127] = 0xe;
77 } else
78 if (rsize == 171 && rdesc[160] == 0x15 && rdesc[161] == 0x0 &&
79 rdesc[162] == 0x25 && rdesc[163] == 0x01) {
80 samsung_dev_trace(hdev, 171);
81 rdesc[161] = 0x1;
82 rdesc[163] = 0x3;
83 }
84}
85
86static int samsung_probe(struct hid_device *hdev,
87 const struct hid_device_id *id)
88{
89 int ret;
90 unsigned int cmask = HID_CONNECT_DEFAULT;
91
92 ret = hid_parse(hdev);
93 if (ret) {
94 dev_err(&hdev->dev, "parse failed\n");
95 goto err_free;
96 }
97
98 if (hdev->rsize == 184) {
99 /* disable hidinput, force hiddev */
100 cmask = (cmask & ~HID_CONNECT_HIDINPUT) |
101 HID_CONNECT_HIDDEV_FORCE;
102 }
103
104 ret = hid_hw_start(hdev, cmask);
105 if (ret) {
106 dev_err(&hdev->dev, "hw start failed\n");
107 goto err_free;
108 }
109
110 return 0;
111err_free:
112 return ret;
113}
114
115static const struct hid_device_id samsung_devices[] = {
116 { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
117 { }
118};
119MODULE_DEVICE_TABLE(hid, samsung_devices);
120
121static struct hid_driver samsung_driver = {
122 .name = "samsung",
123 .id_table = samsung_devices,
124 .report_fixup = samsung_report_fixup,
125 .probe = samsung_probe,
126};
127
128static int __init samsung_init(void)
129{
130 return hid_register_driver(&samsung_driver);
131}
132
133static void __exit samsung_exit(void)
134{
135 hid_unregister_driver(&samsung_driver);
136}
137
138module_init(samsung_init);
139module_exit(samsung_exit);
140MODULE_LICENSE("GPL");