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 | |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 15 | #include <linux/workqueue.h> |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 16 | #include <linux/spinlock.h> |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 17 | #include <linux/sched.h> |
Mauro Carvalho Chehab | 3f113e3 | 2010-04-08 15:10:27 -0300 | [diff] [blame] | 18 | #include "ir-core-priv.h" |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 19 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 20 | /* Define the max number of pulse/space transitions to buffer */ |
| 21 | #define MAX_IR_EVENT_SIZE 512 |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 22 | |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 23 | /* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */ |
| 24 | static LIST_HEAD(ir_raw_client_list); |
| 25 | |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 26 | /* Used to handle IR raw handler extensions */ |
Mauro Carvalho Chehab | 6eb9435 | 2010-04-07 16:19:36 -0300 | [diff] [blame] | 27 | static DEFINE_SPINLOCK(ir_raw_handler_lock); |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 28 | static LIST_HEAD(ir_raw_handler_list); |
| 29 | static u64 available_protocols; |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 30 | |
Mauro Carvalho Chehab | 5fa2989 | 2010-04-08 19:04:06 -0300 | [diff] [blame] | 31 | #ifdef MODULE |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 32 | /* Used to load the decoders */ |
| 33 | static struct work_struct wq_load; |
Mauro Carvalho Chehab | 5fa2989 | 2010-04-08 19:04:06 -0300 | [diff] [blame] | 34 | #endif |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 35 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 36 | static void ir_raw_event_work(struct work_struct *work) |
| 37 | { |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 38 | struct ir_raw_event ev; |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 39 | struct ir_raw_handler *handler; |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 40 | struct ir_raw_event_ctrl *raw = |
| 41 | container_of(work, struct ir_raw_event_ctrl, rx_work); |
| 42 | |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 43 | while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev)) { |
| 44 | spin_lock(&ir_raw_handler_lock); |
| 45 | list_for_each_entry(handler, &ir_raw_handler_list, list) |
| 46 | handler->decode(raw->input_dev, ev); |
| 47 | spin_unlock(&ir_raw_handler_lock); |
| 48 | raw->prev_ev = ev; |
| 49 | } |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 50 | } |
| 51 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 52 | /** |
| 53 | * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders |
| 54 | * @input_dev: the struct input_dev device descriptor |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 55 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 56 | * |
| 57 | * This routine (which may be called from an interrupt context) stores a |
| 58 | * pulse/space duration for the raw ir decoding state machines. Pulses are |
| 59 | * signalled as positive values and spaces as negative values. A zero value |
| 60 | * will reset the decoding state machines. |
| 61 | */ |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 62 | int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev) |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 63 | { |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 64 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 65 | |
| 66 | if (!ir->raw) |
| 67 | return -EINVAL; |
| 68 | |
Maxim Levitsky | 510fcb7 | 2010-07-31 11:59:15 -0300 | [diff] [blame^] | 69 | IR_dprintk(2, "sample: (05%dus %s)\n", |
| 70 | TO_US(ev->duration), TO_STR(ev->pulse)); |
| 71 | |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 72 | if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 73 | return -ENOMEM; |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 74 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 75 | return 0; |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 76 | } |
| 77 | EXPORT_SYMBOL_GPL(ir_raw_event_store); |
| 78 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 79 | /** |
| 80 | * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space |
| 81 | * @input_dev: the struct input_dev device descriptor |
| 82 | * @type: the type of the event that has occurred |
| 83 | * |
| 84 | * This routine (which may be called from an interrupt context) is used to |
| 85 | * store the beginning of an ir pulse or space (or the start/end of ir |
| 86 | * reception) for the raw ir decoding state machines. This is used by |
| 87 | * hardware which does not provide durations directly but only interrupts |
| 88 | * (or similar events) on state change. |
| 89 | */ |
| 90 | int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type) |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 91 | { |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 92 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 93 | ktime_t now; |
| 94 | s64 delta; /* ns */ |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 95 | struct ir_raw_event ev; |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 96 | int rc = 0; |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 97 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 98 | if (!ir->raw) |
| 99 | return -EINVAL; |
| 100 | |
| 101 | now = ktime_get(); |
| 102 | delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); |
| 103 | |
| 104 | /* Check for a long duration since last event or if we're |
| 105 | * being called for the first time, note that delta can't |
| 106 | * possibly be negative. |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 107 | */ |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 108 | ev.duration = 0; |
| 109 | if (delta > IR_MAX_DURATION || !ir->raw->last_type) |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 110 | type |= IR_START_EVENT; |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 111 | else |
| 112 | ev.duration = delta; |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 113 | |
| 114 | if (type & IR_START_EVENT) |
| 115 | ir_raw_event_reset(input_dev); |
David Härdeman | e40b112 | 2010-04-15 18:46:00 -0300 | [diff] [blame] | 116 | else if (ir->raw->last_type & IR_SPACE) { |
| 117 | ev.pulse = false; |
| 118 | rc = ir_raw_event_store(input_dev, &ev); |
| 119 | } else if (ir->raw->last_type & IR_PULSE) { |
| 120 | ev.pulse = true; |
| 121 | rc = ir_raw_event_store(input_dev, &ev); |
| 122 | } else |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 123 | return 0; |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 124 | |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 125 | ir->raw->last_event = now; |
| 126 | ir->raw->last_type = type; |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 127 | return rc; |
| 128 | } |
David Härdeman | 724e249 | 2010-04-08 13:10:00 -0300 | [diff] [blame] | 129 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
| 130 | |
| 131 | /** |
| 132 | * ir_raw_event_handle() - schedules the decoding of stored ir data |
| 133 | * @input_dev: the struct input_dev device descriptor |
| 134 | * |
| 135 | * This routine will signal the workqueue to start decoding stored ir data. |
| 136 | */ |
| 137 | void ir_raw_event_handle(struct input_dev *input_dev) |
| 138 | { |
| 139 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 140 | |
| 141 | if (!ir->raw) |
| 142 | return; |
| 143 | |
| 144 | schedule_work(&ir->raw->rx_work); |
| 145 | } |
Mauro Carvalho Chehab | a3572c3 | 2010-03-20 20:59:44 -0300 | [diff] [blame] | 146 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 147 | |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 148 | /* used internally by the sysfs interface */ |
| 149 | u64 |
| 150 | ir_raw_get_allowed_protocols() |
| 151 | { |
| 152 | u64 protocols; |
| 153 | spin_lock(&ir_raw_handler_lock); |
| 154 | protocols = available_protocols; |
| 155 | spin_unlock(&ir_raw_handler_lock); |
| 156 | return protocols; |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Used to (un)register raw event clients |
| 161 | */ |
| 162 | int ir_raw_event_register(struct input_dev *input_dev) |
| 163 | { |
| 164 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
| 165 | int rc; |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 166 | struct ir_raw_handler *handler; |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 167 | |
| 168 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); |
| 169 | if (!ir->raw) |
| 170 | return -ENOMEM; |
| 171 | |
| 172 | ir->raw->input_dev = input_dev; |
| 173 | INIT_WORK(&ir->raw->rx_work, ir_raw_event_work); |
| 174 | ir->raw->enabled_protocols = ~0; |
| 175 | rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE, |
| 176 | GFP_KERNEL); |
| 177 | if (rc < 0) { |
| 178 | kfree(ir->raw); |
| 179 | ir->raw = NULL; |
| 180 | return rc; |
| 181 | } |
| 182 | |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 183 | spin_lock(&ir_raw_handler_lock); |
| 184 | list_add_tail(&ir->raw->list, &ir_raw_client_list); |
| 185 | list_for_each_entry(handler, &ir_raw_handler_list, list) |
| 186 | if (handler->raw_register) |
| 187 | handler->raw_register(ir->raw->input_dev); |
| 188 | spin_unlock(&ir_raw_handler_lock); |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 189 | |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 190 | return 0; |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | void ir_raw_event_unregister(struct input_dev *input_dev) |
| 194 | { |
| 195 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 196 | struct ir_raw_handler *handler; |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 197 | |
| 198 | if (!ir->raw) |
| 199 | return; |
| 200 | |
| 201 | cancel_work_sync(&ir->raw->rx_work); |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 202 | |
| 203 | spin_lock(&ir_raw_handler_lock); |
| 204 | list_del(&ir->raw->list); |
| 205 | list_for_each_entry(handler, &ir_raw_handler_list, list) |
| 206 | if (handler->raw_unregister) |
| 207 | handler->raw_unregister(ir->raw->input_dev); |
| 208 | spin_unlock(&ir_raw_handler_lock); |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 209 | |
| 210 | kfifo_free(&ir->raw->kfifo); |
| 211 | kfree(ir->raw); |
| 212 | ir->raw = NULL; |
| 213 | } |
| 214 | |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 215 | /* |
| 216 | * Extension interface - used to register the IR decoders |
| 217 | */ |
| 218 | |
| 219 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) |
| 220 | { |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 221 | struct ir_raw_event_ctrl *raw; |
| 222 | |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 223 | spin_lock(&ir_raw_handler_lock); |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 224 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 225 | if (ir_raw_handler->raw_register) |
| 226 | list_for_each_entry(raw, &ir_raw_client_list, list) |
| 227 | ir_raw_handler->raw_register(raw->input_dev); |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 228 | available_protocols |= ir_raw_handler->protocols; |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 229 | spin_unlock(&ir_raw_handler_lock); |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 230 | |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 231 | return 0; |
| 232 | } |
| 233 | EXPORT_SYMBOL(ir_raw_handler_register); |
| 234 | |
| 235 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) |
| 236 | { |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 237 | struct ir_raw_event_ctrl *raw; |
| 238 | |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 239 | spin_lock(&ir_raw_handler_lock); |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 240 | list_del(&ir_raw_handler->list); |
David Härdeman | c216369 | 2010-06-13 17:29:36 -0300 | [diff] [blame] | 241 | if (ir_raw_handler->raw_unregister) |
| 242 | list_for_each_entry(raw, &ir_raw_client_list, list) |
| 243 | ir_raw_handler->raw_unregister(raw->input_dev); |
David Härdeman | 667c9eb | 2010-06-13 17:29:31 -0300 | [diff] [blame] | 244 | available_protocols &= ~ir_raw_handler->protocols; |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 245 | spin_unlock(&ir_raw_handler_lock); |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 246 | } |
| 247 | EXPORT_SYMBOL(ir_raw_handler_unregister); |
| 248 | |
Mauro Carvalho Chehab | 5fa2989 | 2010-04-08 19:04:06 -0300 | [diff] [blame] | 249 | #ifdef MODULE |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 250 | static void init_decoders(struct work_struct *work) |
| 251 | { |
| 252 | /* Load the decoder modules */ |
| 253 | |
| 254 | load_nec_decode(); |
Mauro Carvalho Chehab | db1423a | 2010-04-04 10:27:20 -0300 | [diff] [blame] | 255 | load_rc5_decode(); |
David Härdeman | 784a493 | 2010-04-08 20:04:40 -0300 | [diff] [blame] | 256 | load_rc6_decode(); |
David Härdeman | bf670f6 | 2010-04-15 18:46:05 -0300 | [diff] [blame] | 257 | load_jvc_decode(); |
David Härdeman | 3fe29c8 | 2010-04-15 18:46:10 -0300 | [diff] [blame] | 258 | load_sony_decode(); |
Jarod Wilson | ca41469 | 2010-07-03 01:07:53 -0300 | [diff] [blame] | 259 | load_lirc_codec(); |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 260 | |
| 261 | /* If needed, we may later add some init code. In this case, |
| 262 | it is needed to change the CONFIG_MODULE test at ir-core.h |
| 263 | */ |
| 264 | } |
Mauro Carvalho Chehab | 5fa2989 | 2010-04-08 19:04:06 -0300 | [diff] [blame] | 265 | #endif |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 266 | |
| 267 | void ir_raw_init(void) |
| 268 | { |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 269 | #ifdef MODULE |
Mauro Carvalho Chehab | 995187b | 2010-03-24 20:47:53 -0300 | [diff] [blame] | 270 | INIT_WORK(&wq_load, init_decoders); |
| 271 | schedule_work(&wq_load); |
Mauro Carvalho Chehab | 93c312f | 2010-03-25 21:13:43 -0300 | [diff] [blame] | 272 | #endif |
| 273 | } |