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Commit | Line | Data |
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829ba9fe | 1 | /* ir-raw.c - handle IR pulse/space events |
a3572c34 MCC |
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 | ||
0d2cb1de | 15 | #include <linux/kthread.h> |
45a568fa | 16 | #include <linux/mutex.h> |
724e2495 | 17 | #include <linux/sched.h> |
0d2cb1de | 18 | #include <linux/freezer.h> |
f62de675 | 19 | #include "rc-core-priv.h" |
a3572c34 | 20 | |
724e2495 DH |
21 | /* Define the max number of pulse/space transitions to buffer */ |
22 | #define MAX_IR_EVENT_SIZE 512 | |
a3572c34 | 23 | |
c216369e DH |
24 | /* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */ |
25 | static LIST_HEAD(ir_raw_client_list); | |
26 | ||
995187be | 27 | /* Used to handle IR raw handler extensions */ |
45a568fa | 28 | static DEFINE_MUTEX(ir_raw_handler_lock); |
667c9ebe DH |
29 | static LIST_HEAD(ir_raw_handler_list); |
30 | static u64 available_protocols; | |
93c312ff | 31 | |
5fa2989f | 32 | #ifdef MODULE |
995187be MCC |
33 | /* Used to load the decoders */ |
34 | static struct work_struct wq_load; | |
5fa2989f | 35 | #endif |
995187be | 36 | |
0d2cb1de | 37 | static int ir_raw_event_thread(void *data) |
724e2495 | 38 | { |
e40b1127 | 39 | struct ir_raw_event ev; |
c216369e | 40 | struct ir_raw_handler *handler; |
0d2cb1de | 41 | struct ir_raw_event_ctrl *raw = (struct ir_raw_event_ctrl *)data; |
c6ef1e7f | 42 | int retval; |
0d2cb1de ML |
43 | |
44 | while (!kthread_should_stop()) { | |
724e2495 | 45 | |
c6ef1e7f ML |
46 | spin_lock_irq(&raw->lock); |
47 | retval = kfifo_out(&raw->kfifo, &ev, sizeof(ev)); | |
48 | ||
49 | if (!retval) { | |
50 | set_current_state(TASK_INTERRUPTIBLE); | |
0d2cb1de | 51 | |
c6ef1e7f ML |
52 | if (kthread_should_stop()) |
53 | set_current_state(TASK_RUNNING); | |
54 | ||
55 | spin_unlock_irq(&raw->lock); | |
56 | schedule(); | |
57 | continue; | |
0d2cb1de ML |
58 | } |
59 | ||
c6ef1e7f | 60 | spin_unlock_irq(&raw->lock); |
0d2cb1de | 61 | |
c6ef1e7f ML |
62 | |
63 | BUG_ON(retval != sizeof(ev)); | |
64 | ||
65 | mutex_lock(&ir_raw_handler_lock); | |
66 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
d8b4b582 | 67 | handler->decode(raw->dev, ev); |
c6ef1e7f ML |
68 | raw->prev_ev = ev; |
69 | mutex_unlock(&ir_raw_handler_lock); | |
c216369e | 70 | } |
0d2cb1de ML |
71 | |
72 | return 0; | |
724e2495 DH |
73 | } |
74 | ||
724e2495 DH |
75 | /** |
76 | * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders | |
d8b4b582 | 77 | * @dev: the struct rc_dev device descriptor |
e40b1127 | 78 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
724e2495 DH |
79 | * |
80 | * This routine (which may be called from an interrupt context) stores a | |
81 | * pulse/space duration for the raw ir decoding state machines. Pulses are | |
82 | * signalled as positive values and spaces as negative values. A zero value | |
83 | * will reset the decoding state machines. | |
84 | */ | |
d8b4b582 | 85 | int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev) |
a3572c34 | 86 | { |
d8b4b582 | 87 | if (!dev->raw) |
a3572c34 MCC |
88 | return -EINVAL; |
89 | ||
74c4792c | 90 | IR_dprintk(2, "sample: (%05dus %s)\n", |
d8b4b582 | 91 | TO_US(ev->duration), TO_STR(ev->pulse)); |
510fcb70 | 92 | |
d8b4b582 | 93 | if (kfifo_in(&dev->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) |
724e2495 | 94 | return -ENOMEM; |
a3572c34 | 95 | |
724e2495 DH |
96 | return 0; |
97 | } | |
98 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
a3572c34 | 99 | |
724e2495 DH |
100 | /** |
101 | * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space | |
d8b4b582 | 102 | * @dev: the struct rc_dev device descriptor |
724e2495 DH |
103 | * @type: the type of the event that has occurred |
104 | * | |
105 | * This routine (which may be called from an interrupt context) is used to | |
106 | * store the beginning of an ir pulse or space (or the start/end of ir | |
107 | * reception) for the raw ir decoding state machines. This is used by | |
108 | * hardware which does not provide durations directly but only interrupts | |
109 | * (or similar events) on state change. | |
110 | */ | |
d8b4b582 | 111 | int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type) |
724e2495 | 112 | { |
724e2495 DH |
113 | ktime_t now; |
114 | s64 delta; /* ns */ | |
83587839 | 115 | DEFINE_IR_RAW_EVENT(ev); |
724e2495 | 116 | int rc = 0; |
a3572c34 | 117 | |
d8b4b582 | 118 | if (!dev->raw) |
724e2495 | 119 | return -EINVAL; |
a3572c34 | 120 | |
724e2495 | 121 | now = ktime_get(); |
d8b4b582 | 122 | delta = ktime_to_ns(ktime_sub(now, dev->raw->last_event)); |
a3572c34 | 123 | |
724e2495 DH |
124 | /* Check for a long duration since last event or if we're |
125 | * being called for the first time, note that delta can't | |
126 | * possibly be negative. | |
127 | */ | |
d8b4b582 | 128 | if (delta > IR_MAX_DURATION || !dev->raw->last_type) |
724e2495 | 129 | type |= IR_START_EVENT; |
e40b1127 DH |
130 | else |
131 | ev.duration = delta; | |
724e2495 DH |
132 | |
133 | if (type & IR_START_EVENT) | |
d8b4b582 DH |
134 | ir_raw_event_reset(dev); |
135 | else if (dev->raw->last_type & IR_SPACE) { | |
e40b1127 | 136 | ev.pulse = false; |
d8b4b582 DH |
137 | rc = ir_raw_event_store(dev, &ev); |
138 | } else if (dev->raw->last_type & IR_PULSE) { | |
e40b1127 | 139 | ev.pulse = true; |
d8b4b582 | 140 | rc = ir_raw_event_store(dev, &ev); |
e40b1127 | 141 | } else |
724e2495 | 142 | return 0; |
a3572c34 | 143 | |
d8b4b582 DH |
144 | dev->raw->last_event = now; |
145 | dev->raw->last_type = type; | |
a3572c34 MCC |
146 | return rc; |
147 | } | |
724e2495 | 148 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
a3572c34 | 149 | |
4a702ebf ML |
150 | /** |
151 | * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing | |
d8b4b582 | 152 | * @dev: the struct rc_dev device descriptor |
4a702ebf ML |
153 | * @type: the type of the event that has occurred |
154 | * | |
155 | * This routine (which may be called from an interrupt context) works | |
25985edc | 156 | * in similar manner to ir_raw_event_store_edge. |
4a702ebf ML |
157 | * This routine is intended for devices with limited internal buffer |
158 | * It automerges samples of same type, and handles timeouts | |
159 | */ | |
d8b4b582 | 160 | int ir_raw_event_store_with_filter(struct rc_dev *dev, struct ir_raw_event *ev) |
4a702ebf | 161 | { |
d8b4b582 | 162 | if (!dev->raw) |
4a702ebf ML |
163 | return -EINVAL; |
164 | ||
165 | /* Ignore spaces in idle mode */ | |
d8b4b582 | 166 | if (dev->idle && !ev->pulse) |
4a702ebf | 167 | return 0; |
d8b4b582 DH |
168 | else if (dev->idle) |
169 | ir_raw_event_set_idle(dev, false); | |
170 | ||
171 | if (!dev->raw->this_ev.duration) | |
172 | dev->raw->this_ev = *ev; | |
173 | else if (ev->pulse == dev->raw->this_ev.pulse) | |
174 | dev->raw->this_ev.duration += ev->duration; | |
175 | else { | |
176 | ir_raw_event_store(dev, &dev->raw->this_ev); | |
177 | dev->raw->this_ev = *ev; | |
4a702ebf ML |
178 | } |
179 | ||
180 | /* Enter idle mode if nessesary */ | |
d8b4b582 DH |
181 | if (!ev->pulse && dev->timeout && |
182 | dev->raw->this_ev.duration >= dev->timeout) | |
183 | ir_raw_event_set_idle(dev, true); | |
184 | ||
4a702ebf ML |
185 | return 0; |
186 | } | |
187 | EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter); | |
188 | ||
4651918a | 189 | /** |
d8b4b582 DH |
190 | * ir_raw_event_set_idle() - provide hint to rc-core when the device is idle or not |
191 | * @dev: the struct rc_dev device descriptor | |
192 | * @idle: whether the device is idle or not | |
4651918a | 193 | */ |
d8b4b582 | 194 | void ir_raw_event_set_idle(struct rc_dev *dev, bool idle) |
4a702ebf | 195 | { |
d8b4b582 | 196 | if (!dev->raw) |
4a702ebf ML |
197 | return; |
198 | ||
4651918a | 199 | IR_dprintk(2, "%s idle mode\n", idle ? "enter" : "leave"); |
4a702ebf ML |
200 | |
201 | if (idle) { | |
d8b4b582 DH |
202 | dev->raw->this_ev.timeout = true; |
203 | ir_raw_event_store(dev, &dev->raw->this_ev); | |
204 | init_ir_raw_event(&dev->raw->this_ev); | |
4a702ebf | 205 | } |
4651918a | 206 | |
d8b4b582 DH |
207 | if (dev->s_idle) |
208 | dev->s_idle(dev, idle); | |
209 | ||
210 | dev->idle = idle; | |
4a702ebf ML |
211 | } |
212 | EXPORT_SYMBOL_GPL(ir_raw_event_set_idle); | |
213 | ||
724e2495 DH |
214 | /** |
215 | * ir_raw_event_handle() - schedules the decoding of stored ir data | |
d8b4b582 | 216 | * @dev: the struct rc_dev device descriptor |
724e2495 | 217 | * |
d8b4b582 | 218 | * This routine will tell rc-core to start decoding stored ir data. |
724e2495 | 219 | */ |
d8b4b582 | 220 | void ir_raw_event_handle(struct rc_dev *dev) |
a3572c34 | 221 | { |
c6ef1e7f | 222 | unsigned long flags; |
a3572c34 | 223 | |
d8b4b582 | 224 | if (!dev->raw) |
724e2495 | 225 | return; |
a3572c34 | 226 | |
d8b4b582 DH |
227 | spin_lock_irqsave(&dev->raw->lock, flags); |
228 | wake_up_process(dev->raw->thread); | |
229 | spin_unlock_irqrestore(&dev->raw->lock, flags); | |
a3572c34 MCC |
230 | } |
231 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be | 232 | |
667c9ebe DH |
233 | /* used internally by the sysfs interface */ |
234 | u64 | |
2dbd61b4 | 235 | ir_raw_get_allowed_protocols(void) |
667c9ebe DH |
236 | { |
237 | u64 protocols; | |
45a568fa | 238 | mutex_lock(&ir_raw_handler_lock); |
667c9ebe | 239 | protocols = available_protocols; |
45a568fa | 240 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
241 | return protocols; |
242 | } | |
243 | ||
244 | /* | |
245 | * Used to (un)register raw event clients | |
246 | */ | |
d8b4b582 | 247 | int ir_raw_event_register(struct rc_dev *dev) |
667c9ebe | 248 | { |
667c9ebe | 249 | int rc; |
c216369e | 250 | struct ir_raw_handler *handler; |
667c9ebe | 251 | |
d8b4b582 DH |
252 | if (!dev) |
253 | return -EINVAL; | |
667c9ebe | 254 | |
d8b4b582 DH |
255 | dev->raw = kzalloc(sizeof(*dev->raw), GFP_KERNEL); |
256 | if (!dev->raw) | |
257 | return -ENOMEM; | |
0d2cb1de | 258 | |
d8b4b582 DH |
259 | dev->raw->dev = dev; |
260 | dev->raw->enabled_protocols = ~0; | |
261 | rc = kfifo_alloc(&dev->raw->kfifo, | |
262 | sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE, | |
667c9ebe | 263 | GFP_KERNEL); |
d8b4b582 DH |
264 | if (rc < 0) |
265 | goto out; | |
667c9ebe | 266 | |
d8b4b582 DH |
267 | spin_lock_init(&dev->raw->lock); |
268 | dev->raw->thread = kthread_run(ir_raw_event_thread, dev->raw, | |
269 | "rc%ld", dev->devno); | |
0d2cb1de | 270 | |
d8b4b582 DH |
271 | if (IS_ERR(dev->raw->thread)) { |
272 | rc = PTR_ERR(dev->raw->thread); | |
273 | goto out; | |
0d2cb1de ML |
274 | } |
275 | ||
45a568fa | 276 | mutex_lock(&ir_raw_handler_lock); |
d8b4b582 | 277 | list_add_tail(&dev->raw->list, &ir_raw_client_list); |
c216369e DH |
278 | list_for_each_entry(handler, &ir_raw_handler_list, list) |
279 | if (handler->raw_register) | |
d8b4b582 | 280 | handler->raw_register(dev); |
45a568fa | 281 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 282 | |
c216369e | 283 | return 0; |
d8b4b582 DH |
284 | |
285 | out: | |
286 | kfree(dev->raw); | |
287 | dev->raw = NULL; | |
288 | return rc; | |
667c9ebe DH |
289 | } |
290 | ||
d8b4b582 | 291 | void ir_raw_event_unregister(struct rc_dev *dev) |
667c9ebe | 292 | { |
c216369e | 293 | struct ir_raw_handler *handler; |
667c9ebe | 294 | |
d8b4b582 | 295 | if (!dev || !dev->raw) |
667c9ebe DH |
296 | return; |
297 | ||
d8b4b582 | 298 | kthread_stop(dev->raw->thread); |
c216369e | 299 | |
45a568fa | 300 | mutex_lock(&ir_raw_handler_lock); |
d8b4b582 | 301 | list_del(&dev->raw->list); |
c216369e DH |
302 | list_for_each_entry(handler, &ir_raw_handler_list, list) |
303 | if (handler->raw_unregister) | |
d8b4b582 | 304 | handler->raw_unregister(dev); |
45a568fa | 305 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 306 | |
d8b4b582 DH |
307 | kfifo_free(&dev->raw->kfifo); |
308 | kfree(dev->raw); | |
309 | dev->raw = NULL; | |
667c9ebe DH |
310 | } |
311 | ||
995187be MCC |
312 | /* |
313 | * Extension interface - used to register the IR decoders | |
314 | */ | |
315 | ||
316 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) | |
317 | { | |
c216369e DH |
318 | struct ir_raw_event_ctrl *raw; |
319 | ||
45a568fa | 320 | mutex_lock(&ir_raw_handler_lock); |
995187be | 321 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
c216369e DH |
322 | if (ir_raw_handler->raw_register) |
323 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
d8b4b582 | 324 | ir_raw_handler->raw_register(raw->dev); |
667c9ebe | 325 | available_protocols |= ir_raw_handler->protocols; |
45a568fa | 326 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 327 | |
995187be MCC |
328 | return 0; |
329 | } | |
330 | EXPORT_SYMBOL(ir_raw_handler_register); | |
331 | ||
332 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) | |
333 | { | |
c216369e DH |
334 | struct ir_raw_event_ctrl *raw; |
335 | ||
45a568fa | 336 | mutex_lock(&ir_raw_handler_lock); |
995187be | 337 | list_del(&ir_raw_handler->list); |
c216369e DH |
338 | if (ir_raw_handler->raw_unregister) |
339 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
d8b4b582 | 340 | ir_raw_handler->raw_unregister(raw->dev); |
667c9ebe | 341 | available_protocols &= ~ir_raw_handler->protocols; |
45a568fa | 342 | mutex_unlock(&ir_raw_handler_lock); |
995187be MCC |
343 | } |
344 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
345 | ||
5fa2989f | 346 | #ifdef MODULE |
995187be MCC |
347 | static void init_decoders(struct work_struct *work) |
348 | { | |
349 | /* Load the decoder modules */ | |
350 | ||
351 | load_nec_decode(); | |
db1423a6 | 352 | load_rc5_decode(); |
784a4931 | 353 | load_rc6_decode(); |
bf670f64 | 354 | load_jvc_decode(); |
3fe29c89 | 355 | load_sony_decode(); |
ca414698 | 356 | load_lirc_codec(); |
995187be MCC |
357 | |
358 | /* If needed, we may later add some init code. In this case, | |
6bda9644 | 359 | it is needed to change the CONFIG_MODULE test at rc-core.h |
995187be MCC |
360 | */ |
361 | } | |
5fa2989f | 362 | #endif |
995187be MCC |
363 | |
364 | void ir_raw_init(void) | |
365 | { | |
93c312ff | 366 | #ifdef MODULE |
995187be MCC |
367 | INIT_WORK(&wq_load, init_decoders); |
368 | schedule_work(&wq_load); | |
93c312ff MCC |
369 | #endif |
370 | } |