Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 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> |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame^] | 16 | #include <linux/workqueue.h> |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 17 | |
| 18 | /* Define the max number of bit transitions per IR keycode */ |
| 19 | #define MAX_IR_EVENT_SIZE 256 |
| 20 | |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame^] | 21 | /* Used to handle IR raw handler extensions */ |
| 22 | static LIST_HEAD(ir_raw_handler_list); |
| 23 | static DEFINE_MUTEX(ir_raw_handler_lock); |
| 24 | |
| 25 | /* Used to load the decoders */ |
| 26 | static struct work_struct wq_load; |
| 27 | |
Mauro Carvalho Chehab | 9f15478 | 2010-03-21 13:00:55 -0300 | [diff] [blame] | 28 | static void ir_keyup_timer(unsigned long data) |
| 29 | { |
| 30 | struct input_dev *input_dev = (struct input_dev *)data; |
| 31 | |
| 32 | ir_keyup(input_dev); |
| 33 | } |
| 34 | |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 35 | int ir_raw_event_register(struct input_dev *input_dev) |
| 36 | { |
| 37 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 38 | int rc, size; |
| 39 | |
| 40 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); |
| 41 | |
| 42 | size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2; |
| 43 | size = roundup_pow_of_two(size); |
| 44 | |
Mauro Carvalho Chehab | 9f15478 | 2010-03-21 13:00:55 -0300 | [diff] [blame] | 45 | init_timer(&ir->raw->timer_keyup); |
| 46 | ir->raw->timer_keyup.function = ir_keyup_timer; |
| 47 | ir->raw->timer_keyup.data = (unsigned long)input_dev; |
| 48 | set_bit(EV_REP, input_dev->evbit); |
| 49 | |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 50 | rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL); |
| 51 | |
| 52 | return rc; |
| 53 | } |
| 54 | EXPORT_SYMBOL_GPL(ir_raw_event_register); |
| 55 | |
| 56 | void ir_raw_event_unregister(struct input_dev *input_dev) |
| 57 | { |
| 58 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 59 | |
| 60 | if (!ir->raw) |
| 61 | return; |
| 62 | |
Mauro Carvalho Chehab | 9f15478 | 2010-03-21 13:00:55 -0300 | [diff] [blame] | 63 | del_timer_sync(&ir->raw->timer_keyup); |
| 64 | |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 65 | kfifo_free(&ir->raw->kfifo); |
| 66 | kfree(ir->raw); |
| 67 | ir->raw = NULL; |
| 68 | } |
| 69 | EXPORT_SYMBOL_GPL(ir_raw_event_unregister); |
| 70 | |
| 71 | int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type) |
| 72 | { |
| 73 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 74 | struct timespec ts; |
| 75 | struct ir_raw_event event; |
| 76 | int rc; |
| 77 | |
| 78 | if (!ir->raw) |
| 79 | return -EINVAL; |
| 80 | |
| 81 | event.type = type; |
| 82 | event.delta.tv_sec = 0; |
| 83 | event.delta.tv_nsec = 0; |
| 84 | |
| 85 | ktime_get_ts(&ts); |
| 86 | |
| 87 | if (timespec_equal(&ir->raw->last_event, &event.delta)) |
| 88 | event.type |= IR_START_EVENT; |
| 89 | else |
| 90 | event.delta = timespec_sub(ts, ir->raw->last_event); |
| 91 | |
| 92 | memcpy(&ir->raw->last_event, &ts, sizeof(ts)); |
| 93 | |
| 94 | if (event.delta.tv_sec) { |
| 95 | event.type |= IR_START_EVENT; |
| 96 | event.delta.tv_sec = 0; |
| 97 | event.delta.tv_nsec = 0; |
| 98 | } |
| 99 | |
| 100 | kfifo_in(&ir->raw->kfifo, &event, sizeof(event)); |
| 101 | |
| 102 | return rc; |
| 103 | } |
| 104 | EXPORT_SYMBOL_GPL(ir_raw_event_store); |
| 105 | |
| 106 | int ir_raw_event_handle(struct input_dev *input_dev) |
| 107 | { |
| 108 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 109 | int rc; |
| 110 | struct ir_raw_event *evs; |
| 111 | int len, i; |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame^] | 112 | struct ir_raw_handler *ir_raw_handler; |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | * Store the events into a temporary buffer. This allows calling more than |
| 116 | * one decoder to deal with the received data |
| 117 | */ |
| 118 | len = kfifo_len(&ir->raw->kfifo) / sizeof(*evs); |
| 119 | if (!len) |
| 120 | return 0; |
| 121 | evs = kmalloc(len * sizeof(*evs), GFP_ATOMIC); |
| 122 | |
| 123 | for (i = 0; i < len; i++) { |
| 124 | rc = kfifo_out(&ir->raw->kfifo, &evs[i], sizeof(*evs)); |
| 125 | if (rc != sizeof(*evs)) { |
| 126 | IR_dprintk(1, "overflow error: received %d instead of %zd\n", |
| 127 | rc, sizeof(*evs)); |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | IR_dprintk(2, "event type %d, time before event: %07luus\n", |
| 131 | evs[i].type, (evs[i].delta.tv_nsec + 500) / 1000); |
| 132 | } |
| 133 | |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame^] | 134 | /* |
| 135 | * Call all ir decoders. This allows decoding the same event with |
| 136 | * more than one protocol handler. |
| 137 | * FIXME: better handle the returned code: does it make sense to use |
| 138 | * other decoders, if the first one already handled the IR? |
| 139 | */ |
| 140 | list_for_each_entry(ir_raw_handler, &ir_raw_handler_list, list) { |
| 141 | rc = ir_raw_handler->decode(input_dev, evs, len); |
| 142 | } |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 143 | |
| 144 | kfree(evs); |
| 145 | |
| 146 | return rc; |
| 147 | } |
| 148 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame^] | 149 | |
| 150 | /* |
| 151 | * Extension interface - used to register the IR decoders |
| 152 | */ |
| 153 | |
| 154 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) |
| 155 | { |
| 156 | mutex_lock(&ir_raw_handler_lock); |
| 157 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
| 158 | mutex_unlock(&ir_raw_handler_lock); |
| 159 | return 0; |
| 160 | } |
| 161 | EXPORT_SYMBOL(ir_raw_handler_register); |
| 162 | |
| 163 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) |
| 164 | { |
| 165 | mutex_lock(&ir_raw_handler_lock); |
| 166 | list_del(&ir_raw_handler->list); |
| 167 | mutex_unlock(&ir_raw_handler_lock); |
| 168 | } |
| 169 | EXPORT_SYMBOL(ir_raw_handler_unregister); |
| 170 | |
| 171 | static void init_decoders(struct work_struct *work) |
| 172 | { |
| 173 | /* Load the decoder modules */ |
| 174 | |
| 175 | load_nec_decode(); |
| 176 | |
| 177 | /* If needed, we may later add some init code. In this case, |
| 178 | it is needed to change the CONFIG_MODULE test at ir-core.h |
| 179 | */ |
| 180 | } |
| 181 | |
| 182 | void ir_raw_init(void) |
| 183 | { |
| 184 | INIT_WORK(&wq_load, init_decoders); |
| 185 | schedule_work(&wq_load); |
| 186 | } |