Commit | Line | Data |
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34fc1322 PG |
1 | /* |
2 | * HID driver for Google Fiber TV Box remote controls | |
3 | * | |
4 | * Copyright (c) 2014-2015 Google Inc. | |
5 | * | |
6 | * Author: Petri Gynther <pgynther@google.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | */ | |
13 | #include <linux/device.h> | |
14 | #include <linux/hid.h> | |
15 | #include <linux/input.h> | |
16 | #include <linux/module.h> | |
17 | ||
18 | #include "hid-ids.h" | |
19 | ||
20 | #define GFRM100 1 /* Google Fiber GFRM100 (Bluetooth classic) */ | |
21 | #define GFRM200 2 /* Google Fiber GFRM200 (Bluetooth LE) */ | |
22 | ||
23 | #define GFRM100_SEARCH_KEY_REPORT_ID 0xF7 | |
24 | #define GFRM100_SEARCH_KEY_DOWN 0x0 | |
25 | #define GFRM100_SEARCH_KEY_AUDIO_DATA 0x1 | |
26 | #define GFRM100_SEARCH_KEY_UP 0x2 | |
27 | ||
28 | static u8 search_key_dn[3] = {0x40, 0x21, 0x02}; | |
29 | static u8 search_key_up[3] = {0x40, 0x00, 0x00}; | |
30 | ||
31 | static int gfrm_input_mapping(struct hid_device *hdev, struct hid_input *hi, | |
32 | struct hid_field *field, struct hid_usage *usage, | |
33 | unsigned long **bit, int *max) | |
34 | { | |
35 | unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev); | |
36 | ||
37 | if (hdev_type == GFRM100) { | |
38 | if (usage->hid == (HID_UP_CONSUMER | 0x4)) { | |
39 | /* Consumer.0004 -> KEY_INFO */ | |
40 | hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_INFO); | |
41 | return 1; | |
42 | } | |
43 | ||
44 | if (usage->hid == (HID_UP_CONSUMER | 0x41)) { | |
45 | /* Consumer.0041 -> KEY_OK */ | |
46 | hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_OK); | |
47 | return 1; | |
48 | } | |
49 | } | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static int gfrm_raw_event(struct hid_device *hdev, struct hid_report *report, | |
55 | u8 *data, int size) | |
56 | { | |
57 | unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev); | |
58 | int ret = 0; | |
59 | ||
60 | if (hdev_type != GFRM100) | |
61 | return 0; | |
62 | ||
63 | if (size < 2 || data[0] != GFRM100_SEARCH_KEY_REPORT_ID) | |
64 | return 0; | |
65 | ||
66 | /* | |
67 | * Convert GFRM100 Search key reports into Consumer.0221 (Key.Search) | |
68 | * reports. Ignore audio data. | |
69 | */ | |
70 | switch (data[1]) { | |
71 | case GFRM100_SEARCH_KEY_DOWN: | |
72 | ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_dn, | |
73 | sizeof(search_key_dn), 1); | |
74 | break; | |
75 | ||
76 | case GFRM100_SEARCH_KEY_AUDIO_DATA: | |
77 | break; | |
78 | ||
79 | case GFRM100_SEARCH_KEY_UP: | |
80 | ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_up, | |
81 | sizeof(search_key_up), 1); | |
82 | break; | |
83 | ||
84 | default: | |
85 | break; | |
86 | } | |
87 | ||
88 | return (ret < 0) ? ret : -1; | |
89 | } | |
90 | ||
e60e063c | 91 | static int gfrm_input_configured(struct hid_device *hid, struct hid_input *hidinput) |
34fc1322 PG |
92 | { |
93 | /* | |
94 | * Enable software autorepeat with: | |
95 | * - repeat delay: 400 msec | |
96 | * - repeat period: 100 msec | |
97 | */ | |
98 | input_enable_softrepeat(hidinput->input, 400, 100); | |
e60e063c | 99 | return 0; |
34fc1322 PG |
100 | } |
101 | ||
102 | static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
103 | { | |
104 | int ret; | |
105 | ||
106 | hid_set_drvdata(hdev, (void *) id->driver_data); | |
107 | ||
108 | ret = hid_parse(hdev); | |
109 | if (ret) | |
110 | goto done; | |
111 | ||
112 | if (id->driver_data == GFRM100) { | |
113 | /* | |
114 | * GFRM100 HID Report Descriptor does not describe the Search | |
115 | * key reports. Thus, we need to add it manually here, so that | |
116 | * those reports reach gfrm_raw_event() from hid_input_report(). | |
117 | */ | |
118 | if (!hid_register_report(hdev, HID_INPUT_REPORT, | |
119 | GFRM100_SEARCH_KEY_REPORT_ID)) { | |
120 | ret = -ENOMEM; | |
121 | goto done; | |
122 | } | |
123 | } | |
124 | ||
125 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
126 | done: | |
127 | return ret; | |
128 | } | |
129 | ||
130 | static void gfrm_remove(struct hid_device *hdev) | |
131 | { | |
132 | hid_hw_stop(hdev); | |
133 | hid_set_drvdata(hdev, NULL); | |
134 | } | |
135 | ||
136 | static const struct hid_device_id gfrm_devices[] = { | |
137 | { HID_BLUETOOTH_DEVICE(0x58, 0x2000), | |
138 | .driver_data = GFRM100 }, | |
139 | { HID_BLUETOOTH_DEVICE(0x471, 0x2210), | |
140 | .driver_data = GFRM200 }, | |
141 | { } | |
142 | }; | |
143 | MODULE_DEVICE_TABLE(hid, gfrm_devices); | |
144 | ||
145 | static struct hid_driver gfrm_driver = { | |
146 | .name = "gfrm", | |
147 | .id_table = gfrm_devices, | |
148 | .probe = gfrm_probe, | |
149 | .remove = gfrm_remove, | |
150 | .input_mapping = gfrm_input_mapping, | |
151 | .raw_event = gfrm_raw_event, | |
152 | .input_configured = gfrm_input_configured, | |
153 | }; | |
154 | ||
155 | module_hid_driver(gfrm_driver); | |
156 | ||
157 | MODULE_AUTHOR("Petri Gynther <pgynther@google.com>"); | |
158 | MODULE_DESCRIPTION("Google Fiber TV Box remote control driver"); | |
159 | MODULE_LICENSE("GPL"); |