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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 | |
995187be MCC |
23 | /* Used to handle IR raw handler extensions */ |
24 | static LIST_HEAD(ir_raw_handler_list); | |
6eb9435b | 25 | static DEFINE_SPINLOCK(ir_raw_handler_lock); |
93c312ff MCC |
26 | |
27 | /** | |
28 | * RUN_DECODER() - runs an operation on all IR decoders | |
29 | * @ops: IR raw handler operation to be called | |
30 | * @arg: arguments to be passed to the callback | |
31 | * | |
32 | * Calls ir_raw_handler::ops for all registered IR handlers. It prevents | |
33 | * new decode addition/removal while running, by locking ir_raw_handler_lock | |
34 | * mutex. If an error occurs, it stops the ops. Otherwise, it returns a sum | |
35 | * of the return codes. | |
36 | */ | |
37 | #define RUN_DECODER(ops, ...) ({ \ | |
38 | struct ir_raw_handler *_ir_raw_handler; \ | |
39 | int _sumrc = 0, _rc; \ | |
40 | spin_lock(&ir_raw_handler_lock); \ | |
41 | list_for_each_entry(_ir_raw_handler, &ir_raw_handler_list, list) { \ | |
42 | if (_ir_raw_handler->ops) { \ | |
43 | _rc = _ir_raw_handler->ops(__VA_ARGS__); \ | |
44 | if (_rc < 0) \ | |
45 | break; \ | |
46 | _sumrc += _rc; \ | |
47 | } \ | |
48 | } \ | |
49 | spin_unlock(&ir_raw_handler_lock); \ | |
50 | _sumrc; \ | |
51 | }) | |
52 | ||
995187be MCC |
53 | |
54 | /* Used to load the decoders */ | |
55 | static struct work_struct wq_load; | |
56 | ||
724e2495 DH |
57 | static void ir_raw_event_work(struct work_struct *work) |
58 | { | |
59 | s64 d; | |
60 | struct ir_raw_event_ctrl *raw = | |
61 | container_of(work, struct ir_raw_event_ctrl, rx_work); | |
62 | ||
63 | while (kfifo_out(&raw->kfifo, &d, sizeof(d)) == sizeof(d)) | |
64 | RUN_DECODER(decode, raw->input_dev, d); | |
65 | } | |
66 | ||
a3572c34 MCC |
67 | int ir_raw_event_register(struct input_dev *input_dev) |
68 | { | |
69 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
724e2495 | 70 | int rc; |
a3572c34 MCC |
71 | |
72 | ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); | |
93c312ff MCC |
73 | if (!ir->raw) |
74 | return -ENOMEM; | |
a3572c34 | 75 | |
724e2495 DH |
76 | ir->raw->input_dev = input_dev; |
77 | INIT_WORK(&ir->raw->rx_work, ir_raw_event_work); | |
a3572c34 | 78 | |
724e2495 DH |
79 | rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE, |
80 | GFP_KERNEL); | |
93c312ff MCC |
81 | if (rc < 0) { |
82 | kfree(ir->raw); | |
83 | ir->raw = NULL; | |
84 | return rc; | |
85 | } | |
86 | ||
87 | rc = RUN_DECODER(raw_register, input_dev); | |
88 | if (rc < 0) { | |
89 | kfifo_free(&ir->raw->kfifo); | |
90 | kfree(ir->raw); | |
91 | ir->raw = NULL; | |
92 | return rc; | |
93 | } | |
a3572c34 MCC |
94 | |
95 | return rc; | |
96 | } | |
a3572c34 MCC |
97 | |
98 | void ir_raw_event_unregister(struct input_dev *input_dev) | |
99 | { | |
100 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
101 | ||
102 | if (!ir->raw) | |
103 | return; | |
104 | ||
724e2495 | 105 | cancel_work_sync(&ir->raw->rx_work); |
93c312ff MCC |
106 | RUN_DECODER(raw_unregister, input_dev); |
107 | ||
a3572c34 MCC |
108 | kfifo_free(&ir->raw->kfifo); |
109 | kfree(ir->raw); | |
110 | ir->raw = NULL; | |
111 | } | |
a3572c34 | 112 | |
724e2495 DH |
113 | /** |
114 | * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders | |
115 | * @input_dev: the struct input_dev device descriptor | |
116 | * @duration: duration of the pulse or space in ns | |
117 | * | |
118 | * This routine (which may be called from an interrupt context) stores a | |
119 | * pulse/space duration for the raw ir decoding state machines. Pulses are | |
120 | * signalled as positive values and spaces as negative values. A zero value | |
121 | * will reset the decoding state machines. | |
122 | */ | |
123 | int ir_raw_event_store(struct input_dev *input_dev, s64 duration) | |
a3572c34 | 124 | { |
724e2495 | 125 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 MCC |
126 | |
127 | if (!ir->raw) | |
128 | return -EINVAL; | |
129 | ||
724e2495 DH |
130 | if (kfifo_in(&ir->raw->kfifo, &duration, sizeof(duration)) != sizeof(duration)) |
131 | return -ENOMEM; | |
a3572c34 | 132 | |
724e2495 DH |
133 | return 0; |
134 | } | |
135 | EXPORT_SYMBOL_GPL(ir_raw_event_store); | |
a3572c34 | 136 | |
724e2495 DH |
137 | /** |
138 | * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space | |
139 | * @input_dev: the struct input_dev device descriptor | |
140 | * @type: the type of the event that has occurred | |
141 | * | |
142 | * This routine (which may be called from an interrupt context) is used to | |
143 | * store the beginning of an ir pulse or space (or the start/end of ir | |
144 | * reception) for the raw ir decoding state machines. This is used by | |
145 | * hardware which does not provide durations directly but only interrupts | |
146 | * (or similar events) on state change. | |
147 | */ | |
148 | int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type) | |
149 | { | |
150 | struct ir_input_dev *ir = input_get_drvdata(input_dev); | |
151 | ktime_t now; | |
152 | s64 delta; /* ns */ | |
153 | int rc = 0; | |
a3572c34 | 154 | |
724e2495 DH |
155 | if (!ir->raw) |
156 | return -EINVAL; | |
a3572c34 | 157 | |
724e2495 DH |
158 | now = ktime_get(); |
159 | delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); | |
a3572c34 | 160 | |
724e2495 DH |
161 | /* Check for a long duration since last event or if we're |
162 | * being called for the first time, note that delta can't | |
163 | * possibly be negative. | |
164 | */ | |
165 | if (delta > NSEC_PER_SEC || !ir->raw->last_type) | |
166 | type |= IR_START_EVENT; | |
167 | ||
168 | if (type & IR_START_EVENT) | |
169 | ir_raw_event_reset(input_dev); | |
170 | else if (ir->raw->last_type & IR_SPACE) | |
171 | rc = ir_raw_event_store(input_dev, -delta); | |
172 | else if (ir->raw->last_type & IR_PULSE) | |
173 | rc = ir_raw_event_store(input_dev, delta); | |
174 | else | |
175 | return 0; | |
a3572c34 | 176 | |
724e2495 DH |
177 | ir->raw->last_event = now; |
178 | ir->raw->last_type = type; | |
a3572c34 MCC |
179 | return rc; |
180 | } | |
724e2495 | 181 | EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); |
a3572c34 | 182 | |
724e2495 DH |
183 | /** |
184 | * ir_raw_event_handle() - schedules the decoding of stored ir data | |
185 | * @input_dev: the struct input_dev device descriptor | |
186 | * | |
187 | * This routine will signal the workqueue to start decoding stored ir data. | |
188 | */ | |
189 | void ir_raw_event_handle(struct input_dev *input_dev) | |
a3572c34 | 190 | { |
724e2495 | 191 | struct ir_input_dev *ir = input_get_drvdata(input_dev); |
a3572c34 | 192 | |
724e2495 DH |
193 | if (!ir->raw) |
194 | return; | |
a3572c34 | 195 | |
724e2495 | 196 | schedule_work(&ir->raw->rx_work); |
a3572c34 MCC |
197 | } |
198 | EXPORT_SYMBOL_GPL(ir_raw_event_handle); | |
995187be MCC |
199 | |
200 | /* | |
201 | * Extension interface - used to register the IR decoders | |
202 | */ | |
203 | ||
204 | int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) | |
205 | { | |
93c312ff | 206 | spin_lock(&ir_raw_handler_lock); |
995187be | 207 | list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); |
93c312ff | 208 | spin_unlock(&ir_raw_handler_lock); |
995187be MCC |
209 | return 0; |
210 | } | |
211 | EXPORT_SYMBOL(ir_raw_handler_register); | |
212 | ||
213 | void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) | |
214 | { | |
93c312ff | 215 | spin_lock(&ir_raw_handler_lock); |
995187be | 216 | list_del(&ir_raw_handler->list); |
93c312ff | 217 | spin_unlock(&ir_raw_handler_lock); |
995187be MCC |
218 | } |
219 | EXPORT_SYMBOL(ir_raw_handler_unregister); | |
220 | ||
221 | static void init_decoders(struct work_struct *work) | |
222 | { | |
223 | /* Load the decoder modules */ | |
224 | ||
225 | load_nec_decode(); | |
db1423a6 | 226 | load_rc5_decode(); |
995187be MCC |
227 | |
228 | /* If needed, we may later add some init code. In this case, | |
229 | it is needed to change the CONFIG_MODULE test at ir-core.h | |
230 | */ | |
231 | } | |
232 | ||
233 | void ir_raw_init(void) | |
234 | { | |
93c312ff | 235 | #ifdef MODULE |
995187be MCC |
236 | INIT_WORK(&wq_load, init_decoders); |
237 | schedule_work(&wq_load); | |
93c312ff MCC |
238 | #endif |
239 | } |