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 int ir_raw_event_register(struct input_dev *input_dev)
22 struct ir_input_dev *ir = input_get_drvdata(input_dev);
25 ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL);
27 size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2;
28 size = roundup_pow_of_two(size);
30 rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
34 EXPORT_SYMBOL_GPL(ir_raw_event_register);
36 void ir_raw_event_unregister(struct input_dev *input_dev)
38 struct ir_input_dev *ir = input_get_drvdata(input_dev);
43 kfifo_free(&ir->raw->kfifo);
47 EXPORT_SYMBOL_GPL(ir_raw_event_unregister);
49 int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type)
51 struct ir_input_dev *ir = input_get_drvdata(input_dev);
53 struct ir_raw_event event;
60 event.delta.tv_sec = 0;
61 event.delta.tv_nsec = 0;
65 if (timespec_equal(&ir->raw->last_event, &event.delta))
66 event.type |= IR_START_EVENT;
68 event.delta = timespec_sub(ts, ir->raw->last_event);
70 memcpy(&ir->raw->last_event, &ts, sizeof(ts));
72 if (event.delta.tv_sec) {
73 event.type |= IR_START_EVENT;
74 event.delta.tv_sec = 0;
75 event.delta.tv_nsec = 0;
78 kfifo_in(&ir->raw->kfifo, &event, sizeof(event));
82 EXPORT_SYMBOL_GPL(ir_raw_event_store);
84 int ir_raw_event_handle(struct input_dev *input_dev)
86 struct ir_input_dev *ir = input_get_drvdata(input_dev);
88 struct ir_raw_event *evs;
92 * Store the events into a temporary buffer. This allows calling more than
93 * one decoder to deal with the received data
95 len = kfifo_len(&ir->raw->kfifo) / sizeof(*evs);
98 evs = kmalloc(len * sizeof(*evs), GFP_ATOMIC);
100 for (i = 0; i < len; i++) {
101 rc = kfifo_out(&ir->raw->kfifo, &evs[i], sizeof(*evs));
102 if (rc != sizeof(*evs)) {
103 IR_dprintk(1, "overflow error: received %d instead of %zd\n",
107 IR_dprintk(2, "event type %d, time before event: %07luus\n",
108 evs[i].type, (evs[i].delta.tv_nsec + 500) / 1000);
111 rc = ir_nec_decode(input_dev, evs, len);
117 EXPORT_SYMBOL_GPL(ir_raw_event_handle);