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a3572c34 MCC |
1 | /* ir-raw-event.c - handle IR Pulse/Space event |
2 | * | |
3 | * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation version 2 of the License. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <media/ir-core.h> | |
995187be | 16 | #include <linux/workqueue.h> |
93c312ff | 17 | #include <linux/spinlock.h> |
a3572c34 MCC |
18 | |
19 | /* Define the max number of bit transitions per IR keycode */ | |
20 | #define MAX_IR_EVENT_SIZE 256 | |
21 | ||
995187be MCC |
22 | /* Used to handle IR raw handler extensions */ |
23 | static LIST_HEAD(ir_raw_handler_list); | |
6eb9435b | 24 | static DEFINE_SPINLOCK(ir_raw_handler_lock); |
93c312ff MCC |
25 | |
26 | /** | |
27 | * RUN_DECODER() - runs an operation on all IR decoders | |
28 | * @ops: IR raw handler operation to be called | |
29 | * @arg: arguments to be passed to the callback | |
30 | * | |
31 | * Calls ir_raw_handler::ops for all registered IR handlers. It prevents | |
32 | * new decode addition/removal while running, by locking ir_raw_handler_lock | |
33 | * mutex. If an error occurs, it stops the ops. Otherwise, it returns a sum | |
34 | * of the return codes. | |
35 | */ | |
36 | #define RUN_DECODER(ops, ...) ({ \ | |
37 | struct ir_raw_handler *_ir_raw_handler; \ | |
38 | int _sumrc = 0, _rc; \ | |
39 | spin_lock(&ir_raw_handler_lock); \ | |
40 | list_for_each_entry(_ir_raw_handler, &ir_raw_handler_list, list) { \ | |
41 | if (_ir_raw_handler->ops) { \ | |
42 | _rc = _ir_raw_handler->ops(__VA_ARGS__); \ | |
43 | if (_rc < 0) \ | |
44 | break; \ | |
45 | _sumrc += _rc; \ | |
46 | } \ | |
47 | } \ | |
48 | spin_unlock(&ir_raw_handler_lock); \ | |
49 | _sumrc; \ | |
50 | }) | |
51 | ||
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52 | |
53 | /* Used to load the decoders */ | |
54 | static struct work_struct wq_load; | |
55 | ||
a3572c34 MCC |
56 | int ir_raw_event_register(struct input_dev *input_dev) |
57 | { | |
58 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
59 | int rc, size; | |
60 | ||
61 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); | |
93c312ff MCC |
62 | if (!ir->raw) |
63 | return -ENOMEM; | |
a3572c34 MCC |
64 | |
65 | size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2; | |
66 | size = roundup_pow_of_two(size); | |
67 | ||
68 | rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL); | |
93c312ff MCC |
69 | if (rc < 0) { |
70 | kfree(ir->raw); | |
71 | ir->raw = NULL; | |
72 | return rc; | |
73 | } | |
74 | ||
75 | rc = RUN_DECODER(raw_register, input_dev); | |
76 | if (rc < 0) { | |
77 | kfifo_free(&ir->raw->kfifo); | |
78 | kfree(ir->raw); | |
79 | ir->raw = NULL; | |
80 | return rc; | |
81 | } | |
a3572c34 MCC |
82 | |
83 | return rc; | |
84 | } | |
a3572c34 MCC |
85 | |
86 | void ir_raw_event_unregister(struct input_dev *input_dev) | |
87 | { | |
88 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
89 | ||
90 | if (!ir->raw) | |
91 | return; | |
92 | ||
93c312ff MCC |
93 | RUN_DECODER(raw_unregister, input_dev); |
94 | ||
a3572c34 MCC |
95 | kfifo_free(&ir->raw->kfifo); |
96 | kfree(ir->raw); | |
97 | ir->raw = NULL; | |
98 | } | |
a3572c34 MCC |
99 | |
100 | int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type) | |
101 | { | |
102 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
103 | struct timespec ts; | |
104 | struct ir_raw_event event; | |
105 | int rc; | |
106 | ||
107 | if (!ir->raw) | |
108 | return -EINVAL; | |
109 | ||
110 | event.type = type; | |
111 | event.delta.tv_sec = 0; | |
112 | event.delta.tv_nsec = 0; | |
113 | ||
114 | ktime_get_ts(&ts); | |
115 | ||
116 | if (timespec_equal(&ir->raw->last_event, &event.delta)) | |
117 | event.type |= IR_START_EVENT; | |
118 | else | |
119 | event.delta = timespec_sub(ts, ir->raw->last_event); | |
120 | ||
121 | memcpy(&ir->raw->last_event, &ts, sizeof(ts)); | |
122 | ||
123 | if (event.delta.tv_sec) { | |
124 | event.type |= IR_START_EVENT; | |
125 | event.delta.tv_sec = 0; | |
126 | event.delta.tv_nsec = 0; | |
127 | } | |
128 | ||
129 | kfifo_in(&ir->raw->kfifo, &event, sizeof(event)); | |
130 | ||
131 | return rc; | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
134 | ||
135 | int ir_raw_event_handle(struct input_dev *input_dev) | |
136 | { | |
137 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
138 | int rc; | |
587835a4 | 139 | struct ir_raw_event ev; |
a3572c34 MCC |
140 | int len, i; |
141 | ||
142 | /* | |
143 | * Store the events into a temporary buffer. This allows calling more than | |
144 | * one decoder to deal with the received data | |
145 | */ | |
587835a4 | 146 | len = kfifo_len(&ir->raw->kfifo) / sizeof(ev); |
a3572c34 MCC |
147 | if (!len) |
148 | return 0; | |
a3572c34 MCC |
149 | |
150 | for (i = 0; i < len; i++) { | |
587835a4 MCC |
151 | rc = kfifo_out(&ir->raw->kfifo, &ev, sizeof(ev)); |
152 | if (rc != sizeof(ev)) { | |
a3572c34 | 153 | IR_dprintk(1, "overflow error: received %d instead of %zd\n", |
587835a4 | 154 | rc, sizeof(ev)); |
a3572c34 MCC |
155 | return -EINVAL; |
156 | } | |
157 | IR_dprintk(2, "event type %d, time before event: %07luus\n", | |
587835a4 MCC |
158 | ev.type, (ev.delta.tv_nsec + 500) / 1000); |
159 | rc = RUN_DECODER(decode, input_dev, &ev); | |
a3572c34 MCC |
160 | } |
161 | ||
995187be MCC |
162 | /* |
163 | * Call all ir decoders. This allows decoding the same event with | |
587835a4 | 164 | * more than one protocol handler. |
995187be | 165 | */ |
a3572c34 MCC |
166 | |
167 | return rc; | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be MCC |
170 | |
171 | /* | |
172 | * Extension interface - used to register the IR decoders | |
173 | */ | |
174 | ||
175 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) | |
176 | { | |
93c312ff | 177 | spin_lock(&ir_raw_handler_lock); |
995187be | 178 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
93c312ff | 179 | spin_unlock(&ir_raw_handler_lock); |
995187be MCC |
180 | return 0; |
181 | } | |
182 | EXPORT_SYMBOL(ir_raw_handler_register); | |
183 | ||
184 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) | |
185 | { | |
93c312ff | 186 | spin_lock(&ir_raw_handler_lock); |
995187be | 187 | list_del(&ir_raw_handler->list); |
93c312ff | 188 | spin_unlock(&ir_raw_handler_lock); |
995187be MCC |
189 | } |
190 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
191 | ||
192 | static void init_decoders(struct work_struct *work) | |
193 | { | |
194 | /* Load the decoder modules */ | |
195 | ||
196 | load_nec_decode(); | |
db1423a6 | 197 | load_rc5_decode(); |
995187be MCC |
198 | |
199 | /* If needed, we may later add some init code. In this case, | |
200 | it is needed to change the CONFIG_MODULE test at ir-core.h | |
201 | */ | |
202 | } | |
203 | ||
204 | void ir_raw_init(void) | |
205 | { | |
93c312ff | 206 | #ifdef MODULE |
995187be MCC |
207 | INIT_WORK(&wq_load, init_decoders); |
208 | schedule_work(&wq_load); | |
93c312ff MCC |
209 | #endif |
210 | } |