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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> |
3f113e36 | 19 | #include "ir-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 ML |
41 | struct ir_raw_event_ctrl *raw = (struct ir_raw_event_ctrl *)data; |
42 | ||
43 | while (!kthread_should_stop()) { | |
44 | try_to_freeze(); | |
724e2495 | 45 | |
45a568fa | 46 | mutex_lock(&ir_raw_handler_lock); |
0d2cb1de ML |
47 | |
48 | while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev)) { | |
49 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
50 | handler->decode(raw->input_dev, ev); | |
51 | raw->prev_ev = ev; | |
52 | } | |
53 | ||
45a568fa | 54 | mutex_unlock(&ir_raw_handler_lock); |
0d2cb1de ML |
55 | |
56 | set_current_state(TASK_INTERRUPTIBLE); | |
57 | schedule(); | |
c216369e | 58 | } |
0d2cb1de ML |
59 | |
60 | return 0; | |
724e2495 DH |
61 | } |
62 | ||
724e2495 DH |
63 | /** |
64 | * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders | |
65 | * @input_dev: the struct input_dev device descriptor | |
e40b1127 | 66 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
724e2495 DH |
67 | * |
68 | * This routine (which may be called from an interrupt context) stores a | |
69 | * pulse/space duration for the raw ir decoding state machines. Pulses are | |
70 | * signalled as positive values and spaces as negative values. A zero value | |
71 | * will reset the decoding state machines. | |
72 | */ | |
e40b1127 | 73 | int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev) |
a3572c34 | 74 | { |
724e2495 | 75 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 MCC |
76 | |
77 | if (!ir->raw) | |
78 | return -EINVAL; | |
79 | ||
510fcb70 ML |
80 | IR_dprintk(2, "sample: (05%dus %s)\n", |
81 | TO_US(ev->duration), TO_STR(ev->pulse)); | |
82 | ||
e40b1127 | 83 | if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) |
724e2495 | 84 | return -ENOMEM; |
a3572c34 | 85 | |
724e2495 DH |
86 | return 0; |
87 | } | |
88 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
a3572c34 | 89 | |
724e2495 DH |
90 | /** |
91 | * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space | |
92 | * @input_dev: the struct input_dev device descriptor | |
93 | * @type: the type of the event that has occurred | |
94 | * | |
95 | * This routine (which may be called from an interrupt context) is used to | |
96 | * store the beginning of an ir pulse or space (or the start/end of ir | |
97 | * reception) for the raw ir decoding state machines. This is used by | |
98 | * hardware which does not provide durations directly but only interrupts | |
99 | * (or similar events) on state change. | |
100 | */ | |
101 | int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type) | |
102 | { | |
103 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
104 | ktime_t now; | |
105 | s64 delta; /* ns */ | |
e40b1127 | 106 | struct ir_raw_event ev; |
724e2495 | 107 | int rc = 0; |
a3572c34 | 108 | |
724e2495 DH |
109 | if (!ir->raw) |
110 | return -EINVAL; | |
a3572c34 | 111 | |
724e2495 DH |
112 | now = ktime_get(); |
113 | delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); | |
a3572c34 | 114 | |
724e2495 DH |
115 | /* Check for a long duration since last event or if we're |
116 | * being called for the first time, note that delta can't | |
117 | * possibly be negative. | |
118 | */ | |
e40b1127 DH |
119 | ev.duration = 0; |
120 | if (delta > IR_MAX_DURATION || !ir->raw->last_type) | |
724e2495 | 121 | type |= IR_START_EVENT; |
e40b1127 DH |
122 | else |
123 | ev.duration = delta; | |
724e2495 DH |
124 | |
125 | if (type & IR_START_EVENT) | |
126 | ir_raw_event_reset(input_dev); | |
e40b1127 DH |
127 | else if (ir->raw->last_type & IR_SPACE) { |
128 | ev.pulse = false; | |
129 | rc = ir_raw_event_store(input_dev, &ev); | |
130 | } else if (ir->raw->last_type & IR_PULSE) { | |
131 | ev.pulse = true; | |
132 | rc = ir_raw_event_store(input_dev, &ev); | |
133 | } else | |
724e2495 | 134 | return 0; |
a3572c34 | 135 | |
724e2495 DH |
136 | ir->raw->last_event = now; |
137 | ir->raw->last_type = type; | |
a3572c34 MCC |
138 | return rc; |
139 | } | |
724e2495 | 140 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
a3572c34 | 141 | |
724e2495 DH |
142 | /** |
143 | * ir_raw_event_handle() - schedules the decoding of stored ir data | |
144 | * @input_dev: the struct input_dev device descriptor | |
145 | * | |
146 | * This routine will signal the workqueue to start decoding stored ir data. | |
147 | */ | |
148 | void ir_raw_event_handle(struct input_dev *input_dev) | |
a3572c34 | 149 | { |
724e2495 | 150 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 | 151 | |
724e2495 DH |
152 | if (!ir->raw) |
153 | return; | |
a3572c34 | 154 | |
0d2cb1de | 155 | wake_up_process(ir->raw->thread); |
a3572c34 MCC |
156 | } |
157 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be | 158 | |
667c9ebe DH |
159 | /* used internally by the sysfs interface */ |
160 | u64 | |
161 | ir_raw_get_allowed_protocols() | |
162 | { | |
163 | u64 protocols; | |
45a568fa | 164 | mutex_lock(&ir_raw_handler_lock); |
667c9ebe | 165 | protocols = available_protocols; |
45a568fa | 166 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
167 | return protocols; |
168 | } | |
169 | ||
170 | /* | |
171 | * Used to (un)register raw event clients | |
172 | */ | |
173 | int ir_raw_event_register(struct input_dev *input_dev) | |
174 | { | |
175 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
176 | int rc; | |
c216369e | 177 | struct ir_raw_handler *handler; |
667c9ebe DH |
178 | |
179 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); | |
180 | if (!ir->raw) | |
181 | return -ENOMEM; | |
182 | ||
183 | ir->raw->input_dev = input_dev; | |
0d2cb1de | 184 | |
667c9ebe DH |
185 | ir->raw->enabled_protocols = ~0; |
186 | rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE, | |
187 | GFP_KERNEL); | |
188 | if (rc < 0) { | |
189 | kfree(ir->raw); | |
190 | ir->raw = NULL; | |
191 | return rc; | |
192 | } | |
193 | ||
0d2cb1de ML |
194 | ir->raw->thread = kthread_run(ir_raw_event_thread, ir->raw, |
195 | "rc%u", (unsigned int)ir->devno); | |
196 | ||
197 | if (IS_ERR(ir->raw->thread)) { | |
198 | kfree(ir->raw); | |
199 | ir->raw = NULL; | |
200 | return PTR_ERR(ir->raw->thread); | |
201 | } | |
202 | ||
45a568fa | 203 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
204 | list_add_tail(&ir->raw->list, &ir_raw_client_list); |
205 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
206 | if (handler->raw_register) | |
207 | handler->raw_register(ir->raw->input_dev); | |
45a568fa | 208 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 209 | |
c216369e | 210 | return 0; |
667c9ebe DH |
211 | } |
212 | ||
213 | void ir_raw_event_unregister(struct input_dev *input_dev) | |
214 | { | |
215 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
c216369e | 216 | struct ir_raw_handler *handler; |
667c9ebe DH |
217 | |
218 | if (!ir->raw) | |
219 | return; | |
220 | ||
0d2cb1de | 221 | kthread_stop(ir->raw->thread); |
c216369e | 222 | |
45a568fa | 223 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
224 | list_del(&ir->raw->list); |
225 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
226 | if (handler->raw_unregister) | |
227 | handler->raw_unregister(ir->raw->input_dev); | |
45a568fa | 228 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
229 | |
230 | kfifo_free(&ir->raw->kfifo); | |
231 | kfree(ir->raw); | |
232 | ir->raw = NULL; | |
233 | } | |
234 | ||
995187be MCC |
235 | /* |
236 | * Extension interface - used to register the IR decoders | |
237 | */ | |
238 | ||
239 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) | |
240 | { | |
c216369e DH |
241 | struct ir_raw_event_ctrl *raw; |
242 | ||
45a568fa | 243 | mutex_lock(&ir_raw_handler_lock); |
995187be | 244 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
c216369e DH |
245 | if (ir_raw_handler->raw_register) |
246 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
247 | ir_raw_handler->raw_register(raw->input_dev); | |
667c9ebe | 248 | available_protocols |= ir_raw_handler->protocols; |
45a568fa | 249 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 250 | |
995187be MCC |
251 | return 0; |
252 | } | |
253 | EXPORT_SYMBOL(ir_raw_handler_register); | |
254 | ||
255 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) | |
256 | { | |
c216369e DH |
257 | struct ir_raw_event_ctrl *raw; |
258 | ||
45a568fa | 259 | mutex_lock(&ir_raw_handler_lock); |
995187be | 260 | list_del(&ir_raw_handler->list); |
c216369e DH |
261 | if (ir_raw_handler->raw_unregister) |
262 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
263 | ir_raw_handler->raw_unregister(raw->input_dev); | |
667c9ebe | 264 | available_protocols &= ~ir_raw_handler->protocols; |
45a568fa | 265 | mutex_unlock(&ir_raw_handler_lock); |
995187be MCC |
266 | } |
267 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
268 | ||
5fa2989f | 269 | #ifdef MODULE |
995187be MCC |
270 | static void init_decoders(struct work_struct *work) |
271 | { | |
272 | /* Load the decoder modules */ | |
273 | ||
274 | load_nec_decode(); | |
db1423a6 | 275 | load_rc5_decode(); |
784a4931 | 276 | load_rc6_decode(); |
bf670f64 | 277 | load_jvc_decode(); |
3fe29c89 | 278 | load_sony_decode(); |
ca414698 | 279 | load_lirc_codec(); |
995187be MCC |
280 | |
281 | /* If needed, we may later add some init code. In this case, | |
282 | it is needed to change the CONFIG_MODULE test at ir-core.h | |
283 | */ | |
284 | } | |
5fa2989f | 285 | #endif |
995187be MCC |
286 | |
287 | void ir_raw_init(void) | |
288 | { | |
93c312ff | 289 | #ifdef MODULE |
995187be MCC |
290 | INIT_WORK(&wq_load, init_decoders); |
291 | schedule_work(&wq_load); | |
93c312ff MCC |
292 | #endif |
293 | } |