1 /* ir-raw-event.c - handle IR Pulse/Space event
3 * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
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.
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.
15 #include <media/ir-core.h>
17 /* Define the max number of bit transitions per IR keycode */
18 #define MAX_IR_EVENT_SIZE 256
20 static void ir_keyup_timer(unsigned long data)
22 struct input_dev *input_dev = (struct input_dev *)data;
27 int ir_raw_event_register(struct input_dev *input_dev)
29 struct ir_input_dev *ir = input_get_drvdata(input_dev);
32 ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL);
34 size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2;
35 size = roundup_pow_of_two(size);
37 init_timer(&ir->raw->timer_keyup);
38 ir->raw->timer_keyup.function = ir_keyup_timer;
39 ir->raw->timer_keyup.data = (unsigned long)input_dev;
40 set_bit(EV_REP, input_dev->evbit);
42 rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
46 EXPORT_SYMBOL_GPL(ir_raw_event_register);
48 void ir_raw_event_unregister(struct input_dev *input_dev)
50 struct ir_input_dev *ir = input_get_drvdata(input_dev);
55 del_timer_sync(&ir->raw->timer_keyup);
57 kfifo_free(&ir->raw->kfifo);
61 EXPORT_SYMBOL_GPL(ir_raw_event_unregister);
63 int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type)
65 struct ir_input_dev *ir = input_get_drvdata(input_dev);
67 struct ir_raw_event event;
74 event.delta.tv_sec = 0;
75 event.delta.tv_nsec = 0;
79 if (timespec_equal(&ir->raw->last_event, &event.delta))
80 event.type |= IR_START_EVENT;
82 event.delta = timespec_sub(ts, ir->raw->last_event);
84 memcpy(&ir->raw->last_event, &ts, sizeof(ts));
86 if (event.delta.tv_sec) {
87 event.type |= IR_START_EVENT;
88 event.delta.tv_sec = 0;
89 event.delta.tv_nsec = 0;
92 kfifo_in(&ir->raw->kfifo, &event, sizeof(event));
96 EXPORT_SYMBOL_GPL(ir_raw_event_store);
98 int ir_raw_event_handle(struct input_dev *input_dev)
100 struct ir_input_dev *ir = input_get_drvdata(input_dev);
102 struct ir_raw_event *evs;
106 * Store the events into a temporary buffer. This allows calling more than
107 * one decoder to deal with the received data
109 len = kfifo_len(&ir->raw->kfifo) / sizeof(*evs);
112 evs = kmalloc(len * sizeof(*evs), GFP_ATOMIC);
114 for (i = 0; i < len; i++) {
115 rc = kfifo_out(&ir->raw->kfifo, &evs[i], sizeof(*evs));
116 if (rc != sizeof(*evs)) {
117 IR_dprintk(1, "overflow error: received %d instead of %zd\n",
121 IR_dprintk(2, "event type %d, time before event: %07luus\n",
122 evs[i].type, (evs[i].delta.tv_nsec + 500) / 1000);
125 rc = ir_nec_decode(input_dev, evs, len);
131 EXPORT_SYMBOL_GPL(ir_raw_event_handle);