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1 | /* |
2 | * HID driver for primax and similar keyboards with in-band modifiers | |
3 | * | |
4 | * Copyright 2011 Google Inc. All Rights Reserved | |
5 | * | |
6 | * Author: | |
7 | * Terry Lambert <tlambert@google.com> | |
8 | * | |
9 | * This software is licensed under the terms of the GNU General Public | |
10 | * License version 2, as published by the Free Software Foundation, and | |
11 | * may be copied, distributed, and modified under those terms. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
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 | static int px_raw_event(struct hid_device *hid, struct hid_report *report, | |
26 | u8 *data, int size) | |
27 | { | |
28 | int idx = size; | |
29 | ||
30 | switch (report->id) { | |
31 | case 0: /* keyboard input */ | |
32 | /* | |
33 | * Convert in-band modifier key values into out of band | |
34 | * modifier bits and pull the key strokes from the report. | |
35 | * Thus a report data set which looked like: | |
36 | * | |
37 | * [00][00][E0][30][00][00][00][00] | |
38 | * (no modifier bits + "Left Shift" key + "1" key) | |
39 | * | |
40 | * Would be converted to: | |
41 | * | |
42 | * [01][00][00][30][00][00][00][00] | |
43 | * (Left Shift modifier bit + "1" key) | |
44 | * | |
45 | * As long as it's in the size range, the upper level | |
46 | * drivers don't particularly care if there are in-band | |
47 | * 0-valued keys, so they don't stop parsing. | |
48 | */ | |
49 | while (--idx > 1) { | |
50 | if (data[idx] < 0xE0 || data[idx] > 0xE7) | |
51 | continue; | |
52 | data[0] |= (1 << (data[idx] - 0xE0)); | |
53 | data[idx] = 0; | |
54 | } | |
55 | hid_report_raw_event(hid, HID_INPUT_REPORT, data, size, 0); | |
56 | return 1; | |
57 | ||
58 | default: /* unknown report */ | |
59 | /* Unknown report type; pass upstream */ | |
60 | hid_info(hid, "unknown report type %d\n", report->id); | |
61 | break; | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static int px_probe(struct hid_device *hid, const struct hid_device_id *id) | |
68 | { | |
69 | int ret; | |
70 | ||
71 | ret = hid_parse(hid); | |
72 | if (ret) { | |
73 | hid_err(hid, "parse failed\n"); | |
74 | goto fail; | |
75 | } | |
76 | ||
77 | ret = hid_hw_start(hid, HID_CONNECT_DEFAULT); | |
78 | if (ret) | |
79 | hid_err(hid, "hw start failed\n"); | |
80 | ||
81 | fail: | |
82 | return ret; | |
83 | } | |
84 | ||
85 | static void px_remove(struct hid_device *hid) | |
86 | { | |
87 | hid_hw_stop(hid); | |
88 | } | |
89 | ||
90 | static const struct hid_device_id px_devices[] = { | |
91 | { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) }, | |
92 | { } | |
93 | }; | |
94 | MODULE_DEVICE_TABLE(hid, px_devices); | |
95 | ||
96 | static struct hid_driver px_driver = { | |
97 | .name = "primax", | |
98 | .id_table = px_devices, | |
99 | .raw_event = px_raw_event, | |
100 | .probe = px_probe, | |
101 | .remove = px_remove, | |
102 | }; | |
103 | ||
104 | static int __init px_init(void) | |
105 | { | |
106 | return hid_register_driver(&px_driver); | |
107 | } | |
108 | ||
109 | static void __exit px_exit(void) | |
110 | { | |
111 | hid_unregister_driver(&px_driver); | |
112 | } | |
113 | ||
114 | module_init(px_init); | |
115 | module_exit(px_exit); | |
116 | MODULE_AUTHOR("Terry Lambert <tlambert@google.com>"); | |
117 | MODULE_LICENSE("GPL"); |