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a3572c34 MCC |
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 | ||
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) | |
67 | handler->decode(raw->input_dev, ev); | |
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 | |
77 | * @input_dev: the struct input_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 | */ | |
e40b1127 | 85 | int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev) |
a3572c34 | 86 | { |
724e2495 | 87 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 MCC |
88 | |
89 | if (!ir->raw) | |
90 | return -EINVAL; | |
91 | ||
74c4792c | 92 | IR_dprintk(2, "sample: (%05dus %s)\n", |
510fcb70 ML |
93 | TO_US(ev->duration), TO_STR(ev->pulse)); |
94 | ||
e40b1127 | 95 | if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) |
724e2495 | 96 | return -ENOMEM; |
a3572c34 | 97 | |
724e2495 DH |
98 | return 0; |
99 | } | |
100 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
a3572c34 | 101 | |
724e2495 DH |
102 | /** |
103 | * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space | |
104 | * @input_dev: the struct input_dev device descriptor | |
105 | * @type: the type of the event that has occurred | |
106 | * | |
107 | * This routine (which may be called from an interrupt context) is used to | |
108 | * store the beginning of an ir pulse or space (or the start/end of ir | |
109 | * reception) for the raw ir decoding state machines. This is used by | |
110 | * hardware which does not provide durations directly but only interrupts | |
111 | * (or similar events) on state change. | |
112 | */ | |
113 | int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type) | |
114 | { | |
115 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
116 | ktime_t now; | |
117 | s64 delta; /* ns */ | |
e40b1127 | 118 | struct ir_raw_event ev; |
724e2495 | 119 | int rc = 0; |
a3572c34 | 120 | |
724e2495 DH |
121 | if (!ir->raw) |
122 | return -EINVAL; | |
a3572c34 | 123 | |
724e2495 DH |
124 | now = ktime_get(); |
125 | delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); | |
a3572c34 | 126 | |
724e2495 DH |
127 | /* Check for a long duration since last event or if we're |
128 | * being called for the first time, note that delta can't | |
129 | * possibly be negative. | |
130 | */ | |
e40b1127 DH |
131 | ev.duration = 0; |
132 | if (delta > IR_MAX_DURATION || !ir->raw->last_type) | |
724e2495 | 133 | type |= IR_START_EVENT; |
e40b1127 DH |
134 | else |
135 | ev.duration = delta; | |
724e2495 DH |
136 | |
137 | if (type & IR_START_EVENT) | |
138 | ir_raw_event_reset(input_dev); | |
e40b1127 DH |
139 | else if (ir->raw->last_type & IR_SPACE) { |
140 | ev.pulse = false; | |
141 | rc = ir_raw_event_store(input_dev, &ev); | |
142 | } else if (ir->raw->last_type & IR_PULSE) { | |
143 | ev.pulse = true; | |
144 | rc = ir_raw_event_store(input_dev, &ev); | |
145 | } else | |
724e2495 | 146 | return 0; |
a3572c34 | 147 | |
724e2495 DH |
148 | ir->raw->last_event = now; |
149 | ir->raw->last_type = type; | |
a3572c34 MCC |
150 | return rc; |
151 | } | |
724e2495 | 152 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
a3572c34 | 153 | |
4a702ebf ML |
154 | /** |
155 | * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing | |
156 | * @input_dev: the struct input_dev device descriptor | |
157 | * @type: the type of the event that has occurred | |
158 | * | |
159 | * This routine (which may be called from an interrupt context) works | |
160 | * in similiar manner to ir_raw_event_store_edge. | |
161 | * This routine is intended for devices with limited internal buffer | |
162 | * It automerges samples of same type, and handles timeouts | |
163 | */ | |
164 | int ir_raw_event_store_with_filter(struct input_dev *input_dev, | |
165 | struct ir_raw_event *ev) | |
166 | { | |
167 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
168 | struct ir_raw_event_ctrl *raw = ir->raw; | |
169 | ||
170 | if (!raw || !ir->props) | |
171 | return -EINVAL; | |
172 | ||
173 | /* Ignore spaces in idle mode */ | |
174 | if (ir->idle && !ev->pulse) | |
175 | return 0; | |
176 | else if (ir->idle) | |
4651918a | 177 | ir_raw_event_set_idle(input_dev, false); |
4a702ebf ML |
178 | |
179 | if (!raw->this_ev.duration) { | |
180 | raw->this_ev = *ev; | |
181 | } else if (ev->pulse == raw->this_ev.pulse) { | |
182 | raw->this_ev.duration += ev->duration; | |
183 | } else { | |
184 | ir_raw_event_store(input_dev, &raw->this_ev); | |
185 | raw->this_ev = *ev; | |
186 | } | |
187 | ||
188 | /* Enter idle mode if nessesary */ | |
189 | if (!ev->pulse && ir->props->timeout && | |
4651918a ML |
190 | raw->this_ev.duration >= ir->props->timeout) { |
191 | ir_raw_event_set_idle(input_dev, true); | |
192 | } | |
4a702ebf ML |
193 | return 0; |
194 | } | |
195 | EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter); | |
196 | ||
4651918a ML |
197 | /** |
198 | * ir_raw_event_set_idle() - hint the ir core if device is receiving | |
199 | * IR data or not | |
200 | * @input_dev: the struct input_dev device descriptor | |
201 | * @idle: the hint value | |
202 | */ | |
203 | void ir_raw_event_set_idle(struct input_dev *input_dev, bool idle) | |
4a702ebf ML |
204 | { |
205 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
206 | struct ir_raw_event_ctrl *raw = ir->raw; | |
4a702ebf | 207 | |
4651918a | 208 | if (!ir->props || !ir->raw) |
4a702ebf ML |
209 | return; |
210 | ||
4651918a | 211 | IR_dprintk(2, "%s idle mode\n", idle ? "enter" : "leave"); |
4a702ebf ML |
212 | |
213 | if (idle) { | |
4651918a | 214 | raw->this_ev.timeout = true; |
4a702ebf | 215 | ir_raw_event_store(input_dev, &raw->this_ev); |
4651918a | 216 | init_ir_raw_event(&raw->this_ev); |
4a702ebf | 217 | } |
4651918a | 218 | |
4a702ebf ML |
219 | if (ir->props->s_idle) |
220 | ir->props->s_idle(ir->props->priv, idle); | |
221 | ir->idle = idle; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(ir_raw_event_set_idle); | |
224 | ||
724e2495 DH |
225 | /** |
226 | * ir_raw_event_handle() - schedules the decoding of stored ir data | |
227 | * @input_dev: the struct input_dev device descriptor | |
228 | * | |
229 | * This routine will signal the workqueue to start decoding stored ir data. | |
230 | */ | |
231 | void ir_raw_event_handle(struct input_dev *input_dev) | |
a3572c34 | 232 | { |
724e2495 | 233 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
c6ef1e7f | 234 | unsigned long flags; |
a3572c34 | 235 | |
724e2495 DH |
236 | if (!ir->raw) |
237 | return; | |
a3572c34 | 238 | |
c6ef1e7f | 239 | spin_lock_irqsave(&ir->raw->lock, flags); |
0d2cb1de | 240 | wake_up_process(ir->raw->thread); |
c6ef1e7f | 241 | spin_unlock_irqrestore(&ir->raw->lock, flags); |
a3572c34 MCC |
242 | } |
243 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be | 244 | |
667c9ebe DH |
245 | /* used internally by the sysfs interface */ |
246 | u64 | |
247 | ir_raw_get_allowed_protocols() | |
248 | { | |
249 | u64 protocols; | |
45a568fa | 250 | mutex_lock(&ir_raw_handler_lock); |
667c9ebe | 251 | protocols = available_protocols; |
45a568fa | 252 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
253 | return protocols; |
254 | } | |
255 | ||
256 | /* | |
257 | * Used to (un)register raw event clients | |
258 | */ | |
259 | int ir_raw_event_register(struct input_dev *input_dev) | |
260 | { | |
261 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
262 | int rc; | |
c216369e | 263 | struct ir_raw_handler *handler; |
667c9ebe DH |
264 | |
265 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); | |
266 | if (!ir->raw) | |
267 | return -ENOMEM; | |
268 | ||
269 | ir->raw->input_dev = input_dev; | |
0d2cb1de | 270 | |
667c9ebe DH |
271 | ir->raw->enabled_protocols = ~0; |
272 | rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE, | |
273 | GFP_KERNEL); | |
274 | if (rc < 0) { | |
275 | kfree(ir->raw); | |
276 | ir->raw = NULL; | |
277 | return rc; | |
278 | } | |
279 | ||
c6ef1e7f | 280 | spin_lock_init(&ir->raw->lock); |
0d2cb1de ML |
281 | ir->raw->thread = kthread_run(ir_raw_event_thread, ir->raw, |
282 | "rc%u", (unsigned int)ir->devno); | |
283 | ||
284 | if (IS_ERR(ir->raw->thread)) { | |
028816bc DC |
285 | int ret = PTR_ERR(ir->raw->thread); |
286 | ||
0d2cb1de ML |
287 | kfree(ir->raw); |
288 | ir->raw = NULL; | |
028816bc | 289 | return ret; |
0d2cb1de ML |
290 | } |
291 | ||
45a568fa | 292 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
293 | list_add_tail(&ir->raw->list, &ir_raw_client_list); |
294 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
295 | if (handler->raw_register) | |
296 | handler->raw_register(ir->raw->input_dev); | |
45a568fa | 297 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 298 | |
c216369e | 299 | return 0; |
667c9ebe DH |
300 | } |
301 | ||
302 | void ir_raw_event_unregister(struct input_dev *input_dev) | |
303 | { | |
304 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
c216369e | 305 | struct ir_raw_handler *handler; |
667c9ebe DH |
306 | |
307 | if (!ir->raw) | |
308 | return; | |
309 | ||
0d2cb1de | 310 | kthread_stop(ir->raw->thread); |
c216369e | 311 | |
45a568fa | 312 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
313 | list_del(&ir->raw->list); |
314 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
315 | if (handler->raw_unregister) | |
316 | handler->raw_unregister(ir->raw->input_dev); | |
45a568fa | 317 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
318 | |
319 | kfifo_free(&ir->raw->kfifo); | |
320 | kfree(ir->raw); | |
321 | ir->raw = NULL; | |
322 | } | |
323 | ||
995187be MCC |
324 | /* |
325 | * Extension interface - used to register the IR decoders | |
326 | */ | |
327 | ||
328 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) | |
329 | { | |
c216369e DH |
330 | struct ir_raw_event_ctrl *raw; |
331 | ||
45a568fa | 332 | mutex_lock(&ir_raw_handler_lock); |
995187be | 333 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
c216369e DH |
334 | if (ir_raw_handler->raw_register) |
335 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
336 | ir_raw_handler->raw_register(raw->input_dev); | |
667c9ebe | 337 | available_protocols |= ir_raw_handler->protocols; |
45a568fa | 338 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 339 | |
995187be MCC |
340 | return 0; |
341 | } | |
342 | EXPORT_SYMBOL(ir_raw_handler_register); | |
343 | ||
344 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) | |
345 | { | |
c216369e DH |
346 | struct ir_raw_event_ctrl *raw; |
347 | ||
45a568fa | 348 | mutex_lock(&ir_raw_handler_lock); |
995187be | 349 | list_del(&ir_raw_handler->list); |
c216369e DH |
350 | if (ir_raw_handler->raw_unregister) |
351 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
352 | ir_raw_handler->raw_unregister(raw->input_dev); | |
667c9ebe | 353 | available_protocols &= ~ir_raw_handler->protocols; |
45a568fa | 354 | mutex_unlock(&ir_raw_handler_lock); |
995187be MCC |
355 | } |
356 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
357 | ||
5fa2989f | 358 | #ifdef MODULE |
995187be MCC |
359 | static void init_decoders(struct work_struct *work) |
360 | { | |
361 | /* Load the decoder modules */ | |
362 | ||
363 | load_nec_decode(); | |
db1423a6 | 364 | load_rc5_decode(); |
784a4931 | 365 | load_rc6_decode(); |
bf670f64 | 366 | load_jvc_decode(); |
3fe29c89 | 367 | load_sony_decode(); |
ca414698 | 368 | load_lirc_codec(); |
995187be MCC |
369 | |
370 | /* If needed, we may later add some init code. In this case, | |
371 | it is needed to change the CONFIG_MODULE test at ir-core.h | |
372 | */ | |
373 | } | |
5fa2989f | 374 | #endif |
995187be MCC |
375 | |
376 | void ir_raw_init(void) | |
377 | { | |
93c312ff | 378 | #ifdef MODULE |
995187be MCC |
379 | INIT_WORK(&wq_load, init_decoders); |
380 | schedule_work(&wq_load); | |
93c312ff MCC |
381 | #endif |
382 | } |