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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 | ||
995187be | 15 | #include <linux/workqueue.h> |
45a568fa | 16 | #include <linux/mutex.h> |
724e2495 | 17 | #include <linux/sched.h> |
3f113e36 | 18 | #include "ir-core-priv.h" |
a3572c34 | 19 | |
724e2495 DH |
20 | /* Define the max number of pulse/space transitions to buffer */ |
21 | #define MAX_IR_EVENT_SIZE 512 | |
a3572c34 | 22 | |
c216369e DH |
23 | /* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */ |
24 | static LIST_HEAD(ir_raw_client_list); | |
25 | ||
995187be | 26 | /* Used to handle IR raw handler extensions */ |
45a568fa | 27 | static DEFINE_MUTEX(ir_raw_handler_lock); |
667c9ebe DH |
28 | static LIST_HEAD(ir_raw_handler_list); |
29 | static u64 available_protocols; | |
93c312ff | 30 | |
5fa2989f | 31 | #ifdef MODULE |
995187be MCC |
32 | /* Used to load the decoders */ |
33 | static struct work_struct wq_load; | |
5fa2989f | 34 | #endif |
995187be | 35 | |
724e2495 DH |
36 | static void ir_raw_event_work(struct work_struct *work) |
37 | { | |
e40b1127 | 38 | struct ir_raw_event ev; |
c216369e | 39 | struct ir_raw_handler *handler; |
724e2495 DH |
40 | struct ir_raw_event_ctrl *raw = |
41 | container_of(work, struct ir_raw_event_ctrl, rx_work); | |
42 | ||
c216369e | 43 | while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev)) { |
45a568fa | 44 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
45 | list_for_each_entry(handler, &ir_raw_handler_list, list) |
46 | handler->decode(raw->input_dev, ev); | |
45a568fa | 47 | mutex_unlock(&ir_raw_handler_lock); |
c216369e DH |
48 | raw->prev_ev = ev; |
49 | } | |
724e2495 DH |
50 | } |
51 | ||
724e2495 DH |
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 | |
e40b1127 | 55 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
724e2495 DH |
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 | */ | |
e40b1127 | 62 | int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev) |
a3572c34 | 63 | { |
724e2495 | 64 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 MCC |
65 | |
66 | if (!ir->raw) | |
67 | return -EINVAL; | |
68 | ||
510fcb70 ML |
69 | IR_dprintk(2, "sample: (05%dus %s)\n", |
70 | TO_US(ev->duration), TO_STR(ev->pulse)); | |
71 | ||
e40b1127 | 72 | if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) |
724e2495 | 73 | return -ENOMEM; |
a3572c34 | 74 | |
724e2495 DH |
75 | return 0; |
76 | } | |
77 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
a3572c34 | 78 | |
724e2495 DH |
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) | |
91 | { | |
92 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
93 | ktime_t now; | |
94 | s64 delta; /* ns */ | |
e40b1127 | 95 | struct ir_raw_event ev; |
724e2495 | 96 | int rc = 0; |
a3572c34 | 97 | |
724e2495 DH |
98 | if (!ir->raw) |
99 | return -EINVAL; | |
a3572c34 | 100 | |
724e2495 DH |
101 | now = ktime_get(); |
102 | delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); | |
a3572c34 | 103 | |
724e2495 DH |
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. | |
107 | */ | |
e40b1127 DH |
108 | ev.duration = 0; |
109 | if (delta > IR_MAX_DURATION || !ir->raw->last_type) | |
724e2495 | 110 | type |= IR_START_EVENT; |
e40b1127 DH |
111 | else |
112 | ev.duration = delta; | |
724e2495 DH |
113 | |
114 | if (type & IR_START_EVENT) | |
115 | ir_raw_event_reset(input_dev); | |
e40b1127 DH |
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 | |
724e2495 | 123 | return 0; |
a3572c34 | 124 | |
724e2495 DH |
125 | ir->raw->last_event = now; |
126 | ir->raw->last_type = type; | |
a3572c34 MCC |
127 | return rc; |
128 | } | |
724e2495 | 129 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
a3572c34 | 130 | |
724e2495 DH |
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) | |
a3572c34 | 138 | { |
724e2495 | 139 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 | 140 | |
724e2495 DH |
141 | if (!ir->raw) |
142 | return; | |
a3572c34 | 143 | |
724e2495 | 144 | schedule_work(&ir->raw->rx_work); |
a3572c34 MCC |
145 | } |
146 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be | 147 | |
667c9ebe DH |
148 | /* used internally by the sysfs interface */ |
149 | u64 | |
150 | ir_raw_get_allowed_protocols() | |
151 | { | |
152 | u64 protocols; | |
45a568fa | 153 | mutex_lock(&ir_raw_handler_lock); |
667c9ebe | 154 | protocols = available_protocols; |
45a568fa | 155 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
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; | |
c216369e | 166 | struct ir_raw_handler *handler; |
667c9ebe DH |
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 | ||
45a568fa | 183 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
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); | |
45a568fa | 188 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 189 | |
c216369e | 190 | return 0; |
667c9ebe DH |
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); | |
c216369e | 196 | struct ir_raw_handler *handler; |
667c9ebe DH |
197 | |
198 | if (!ir->raw) | |
199 | return; | |
200 | ||
201 | cancel_work_sync(&ir->raw->rx_work); | |
c216369e | 202 | |
45a568fa | 203 | mutex_lock(&ir_raw_handler_lock); |
c216369e DH |
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); | |
45a568fa | 208 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe DH |
209 | |
210 | kfifo_free(&ir->raw->kfifo); | |
211 | kfree(ir->raw); | |
212 | ir->raw = NULL; | |
213 | } | |
214 | ||
995187be MCC |
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 | { | |
c216369e DH |
221 | struct ir_raw_event_ctrl *raw; |
222 | ||
45a568fa | 223 | mutex_lock(&ir_raw_handler_lock); |
995187be | 224 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
c216369e DH |
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); | |
667c9ebe | 228 | available_protocols |= ir_raw_handler->protocols; |
45a568fa | 229 | mutex_unlock(&ir_raw_handler_lock); |
667c9ebe | 230 | |
995187be MCC |
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 | { | |
c216369e DH |
237 | struct ir_raw_event_ctrl *raw; |
238 | ||
45a568fa | 239 | mutex_lock(&ir_raw_handler_lock); |
995187be | 240 | list_del(&ir_raw_handler->list); |
c216369e DH |
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); | |
667c9ebe | 244 | available_protocols &= ~ir_raw_handler->protocols; |
45a568fa | 245 | mutex_unlock(&ir_raw_handler_lock); |
995187be MCC |
246 | } |
247 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
248 | ||
5fa2989f | 249 | #ifdef MODULE |
995187be MCC |
250 | static void init_decoders(struct work_struct *work) |
251 | { | |
252 | /* Load the decoder modules */ | |
253 | ||
254 | load_nec_decode(); | |
db1423a6 | 255 | load_rc5_decode(); |
784a4931 | 256 | load_rc6_decode(); |
bf670f64 | 257 | load_jvc_decode(); |
3fe29c89 | 258 | load_sony_decode(); |
ca414698 | 259 | load_lirc_codec(); |
995187be MCC |
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 | } | |
5fa2989f | 265 | #endif |
995187be MCC |
266 | |
267 | void ir_raw_init(void) | |
268 | { | |
93c312ff | 269 | #ifdef MODULE |
995187be MCC |
270 | INIT_WORK(&wq_load, init_decoders); |
271 | schedule_work(&wq_load); | |
93c312ff MCC |
272 | #endif |
273 | } |