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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> |
93c312ff | 16 | #include <linux/spinlock.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 */ |
6eb9435b | 27 | static DEFINE_SPINLOCK(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 DH |
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 | } | |
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 | ||
e40b1127 | 69 | if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) |
724e2495 | 70 | return -ENOMEM; |
a3572c34 | 71 | |
724e2495 DH |
72 | return 0; |
73 | } | |
74 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
a3572c34 | 75 | |
724e2495 DH |
76 | /** |
77 | * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space | |
78 | * @input_dev: the struct input_dev device descriptor | |
79 | * @type: the type of the event that has occurred | |
80 | * | |
81 | * This routine (which may be called from an interrupt context) is used to | |
82 | * store the beginning of an ir pulse or space (or the start/end of ir | |
83 | * reception) for the raw ir decoding state machines. This is used by | |
84 | * hardware which does not provide durations directly but only interrupts | |
85 | * (or similar events) on state change. | |
86 | */ | |
87 | int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type) | |
88 | { | |
89 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
90 | ktime_t now; | |
91 | s64 delta; /* ns */ | |
e40b1127 | 92 | struct ir_raw_event ev; |
724e2495 | 93 | int rc = 0; |
a3572c34 | 94 | |
724e2495 DH |
95 | if (!ir->raw) |
96 | return -EINVAL; | |
a3572c34 | 97 | |
724e2495 DH |
98 | now = ktime_get(); |
99 | delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); | |
a3572c34 | 100 | |
724e2495 DH |
101 | /* Check for a long duration since last event or if we're |
102 | * being called for the first time, note that delta can't | |
103 | * possibly be negative. | |
104 | */ | |
e40b1127 DH |
105 | ev.duration = 0; |
106 | if (delta > IR_MAX_DURATION || !ir->raw->last_type) | |
724e2495 | 107 | type |= IR_START_EVENT; |
e40b1127 DH |
108 | else |
109 | ev.duration = delta; | |
724e2495 DH |
110 | |
111 | if (type & IR_START_EVENT) | |
112 | ir_raw_event_reset(input_dev); | |
e40b1127 DH |
113 | else if (ir->raw->last_type & IR_SPACE) { |
114 | ev.pulse = false; | |
115 | rc = ir_raw_event_store(input_dev, &ev); | |
116 | } else if (ir->raw->last_type & IR_PULSE) { | |
117 | ev.pulse = true; | |
118 | rc = ir_raw_event_store(input_dev, &ev); | |
119 | } else | |
724e2495 | 120 | return 0; |
a3572c34 | 121 | |
724e2495 DH |
122 | ir->raw->last_event = now; |
123 | ir->raw->last_type = type; | |
a3572c34 MCC |
124 | return rc; |
125 | } | |
724e2495 | 126 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
a3572c34 | 127 | |
724e2495 DH |
128 | /** |
129 | * ir_raw_event_handle() - schedules the decoding of stored ir data | |
130 | * @input_dev: the struct input_dev device descriptor | |
131 | * | |
132 | * This routine will signal the workqueue to start decoding stored ir data. | |
133 | */ | |
134 | void ir_raw_event_handle(struct input_dev *input_dev) | |
a3572c34 | 135 | { |
724e2495 | 136 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 | 137 | |
724e2495 DH |
138 | if (!ir->raw) |
139 | return; | |
a3572c34 | 140 | |
724e2495 | 141 | schedule_work(&ir->raw->rx_work); |
a3572c34 MCC |
142 | } |
143 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be | 144 | |
667c9ebe DH |
145 | /* used internally by the sysfs interface */ |
146 | u64 | |
147 | ir_raw_get_allowed_protocols() | |
148 | { | |
149 | u64 protocols; | |
150 | spin_lock(&ir_raw_handler_lock); | |
151 | protocols = available_protocols; | |
152 | spin_unlock(&ir_raw_handler_lock); | |
153 | return protocols; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Used to (un)register raw event clients | |
158 | */ | |
159 | int ir_raw_event_register(struct input_dev *input_dev) | |
160 | { | |
161 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
162 | int rc; | |
c216369e | 163 | struct ir_raw_handler *handler; |
667c9ebe DH |
164 | |
165 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); | |
166 | if (!ir->raw) | |
167 | return -ENOMEM; | |
168 | ||
169 | ir->raw->input_dev = input_dev; | |
170 | INIT_WORK(&ir->raw->rx_work, ir_raw_event_work); | |
171 | ir->raw->enabled_protocols = ~0; | |
172 | rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE, | |
173 | GFP_KERNEL); | |
174 | if (rc < 0) { | |
175 | kfree(ir->raw); | |
176 | ir->raw = NULL; | |
177 | return rc; | |
178 | } | |
179 | ||
c216369e DH |
180 | spin_lock(&ir_raw_handler_lock); |
181 | list_add_tail(&ir->raw->list, &ir_raw_client_list); | |
182 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
183 | if (handler->raw_register) | |
184 | handler->raw_register(ir->raw->input_dev); | |
185 | spin_unlock(&ir_raw_handler_lock); | |
667c9ebe | 186 | |
c216369e | 187 | return 0; |
667c9ebe DH |
188 | } |
189 | ||
190 | void ir_raw_event_unregister(struct input_dev *input_dev) | |
191 | { | |
192 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
c216369e | 193 | struct ir_raw_handler *handler; |
667c9ebe DH |
194 | |
195 | if (!ir->raw) | |
196 | return; | |
197 | ||
198 | cancel_work_sync(&ir->raw->rx_work); | |
c216369e DH |
199 | |
200 | spin_lock(&ir_raw_handler_lock); | |
201 | list_del(&ir->raw->list); | |
202 | list_for_each_entry(handler, &ir_raw_handler_list, list) | |
203 | if (handler->raw_unregister) | |
204 | handler->raw_unregister(ir->raw->input_dev); | |
205 | spin_unlock(&ir_raw_handler_lock); | |
667c9ebe DH |
206 | |
207 | kfifo_free(&ir->raw->kfifo); | |
208 | kfree(ir->raw); | |
209 | ir->raw = NULL; | |
210 | } | |
211 | ||
995187be MCC |
212 | /* |
213 | * Extension interface - used to register the IR decoders | |
214 | */ | |
215 | ||
216 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) | |
217 | { | |
c216369e DH |
218 | struct ir_raw_event_ctrl *raw; |
219 | ||
93c312ff | 220 | spin_lock(&ir_raw_handler_lock); |
995187be | 221 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
c216369e DH |
222 | if (ir_raw_handler->raw_register) |
223 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
224 | ir_raw_handler->raw_register(raw->input_dev); | |
667c9ebe | 225 | available_protocols |= ir_raw_handler->protocols; |
93c312ff | 226 | spin_unlock(&ir_raw_handler_lock); |
667c9ebe | 227 | |
995187be MCC |
228 | return 0; |
229 | } | |
230 | EXPORT_SYMBOL(ir_raw_handler_register); | |
231 | ||
232 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) | |
233 | { | |
c216369e DH |
234 | struct ir_raw_event_ctrl *raw; |
235 | ||
93c312ff | 236 | spin_lock(&ir_raw_handler_lock); |
995187be | 237 | list_del(&ir_raw_handler->list); |
c216369e DH |
238 | if (ir_raw_handler->raw_unregister) |
239 | list_for_each_entry(raw, &ir_raw_client_list, list) | |
240 | ir_raw_handler->raw_unregister(raw->input_dev); | |
667c9ebe | 241 | available_protocols &= ~ir_raw_handler->protocols; |
93c312ff | 242 | spin_unlock(&ir_raw_handler_lock); |
995187be MCC |
243 | } |
244 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
245 | ||
5fa2989f | 246 | #ifdef MODULE |
995187be MCC |
247 | static void init_decoders(struct work_struct *work) |
248 | { | |
249 | /* Load the decoder modules */ | |
250 | ||
251 | load_nec_decode(); | |
db1423a6 | 252 | load_rc5_decode(); |
784a4931 | 253 | load_rc6_decode(); |
bf670f64 | 254 | load_jvc_decode(); |
3fe29c89 | 255 | load_sony_decode(); |
ca414698 | 256 | load_lirc_codec(); |
995187be MCC |
257 | |
258 | /* If needed, we may later add some init code. In this case, | |
259 | it is needed to change the CONFIG_MODULE test at ir-core.h | |
260 | */ | |
261 | } | |
5fa2989f | 262 | #endif |
995187be MCC |
263 | |
264 | void ir_raw_init(void) | |
265 | { | |
93c312ff | 266 | #ifdef MODULE |
995187be MCC |
267 | INIT_WORK(&wq_load, init_decoders); |
268 | schedule_work(&wq_load); | |
93c312ff MCC |
269 | #endif |
270 | } |