Commit | Line | Data |
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457e2ffc | 1 | /* ir-lirc-codec.c - rc-core to classic lirc interface bridge |
ca414698 JW |
2 | * |
3 | * Copyright (C) 2010 by Jarod Wilson <jarod@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 | ||
15 | #include <linux/sched.h> | |
16 | #include <linux/wait.h> | |
7a707b89 | 17 | #include <linux/module.h> |
ca414698 | 18 | #include <media/lirc.h> |
5690085e | 19 | #include <media/lirc_dev.h> |
6bda9644 | 20 | #include <media/rc-core.h> |
f62de675 | 21 | #include "rc-core-priv.h" |
ca414698 JW |
22 | |
23 | #define LIRCBUF_SIZE 256 | |
24 | ||
25 | /** | |
26 | * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the | |
27 | * lircd userspace daemon for decoding. | |
d8b4b582 | 28 | * @input_dev: the struct rc_dev descriptor of the device |
ca414698 JW |
29 | * @duration: the struct ir_raw_event descriptor of the pulse/space |
30 | * | |
31 | * This function returns -EINVAL if the lirc interfaces aren't wired up. | |
32 | */ | |
d8b4b582 | 33 | static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev) |
ca414698 | 34 | { |
d8b4b582 | 35 | struct lirc_codec *lirc = &dev->raw->lirc; |
510fcb70 | 36 | int sample; |
ca414698 | 37 | |
d8b4b582 | 38 | if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf) |
ca414698 JW |
39 | return -EINVAL; |
40 | ||
4651918a | 41 | /* Packet start */ |
a8f29e89 AL |
42 | if (ev.reset) { |
43 | /* Userspace expects a long space event before the start of | |
44 | * the signal to use as a sync. This may be done with repeat | |
45 | * packets and normal samples. But if a reset has been sent | |
46 | * then we assume that a long time has passed, so we send a | |
47 | * space with the maximum time value. */ | |
48 | sample = LIRC_SPACE(LIRC_VALUE_MASK); | |
49 | IR_dprintk(2, "delivering reset sync space to lirc_dev\n"); | |
510fcb70 | 50 | |
4651918a | 51 | /* Carrier reports */ |
a8f29e89 | 52 | } else if (ev.carrier_report) { |
4651918a | 53 | sample = LIRC_FREQUENCY(ev.carrier); |
457e2ffc | 54 | IR_dprintk(2, "carrier report (freq: %d)\n", sample); |
ca414698 | 55 | |
4651918a ML |
56 | /* Packet end */ |
57 | } else if (ev.timeout) { | |
58 | ||
59 | if (lirc->gap) | |
60 | return 0; | |
61 | ||
62 | lirc->gap_start = ktime_get(); | |
63 | lirc->gap = true; | |
64 | lirc->gap_duration = ev.duration; | |
65 | ||
66 | if (!lirc->send_timeout_reports) | |
67 | return 0; | |
68 | ||
69 | sample = LIRC_TIMEOUT(ev.duration / 1000); | |
457e2ffc | 70 | IR_dprintk(2, "timeout report (duration: %d)\n", sample); |
4651918a ML |
71 | |
72 | /* Normal sample */ | |
73 | } else { | |
74 | ||
75 | if (lirc->gap) { | |
76 | int gap_sample; | |
77 | ||
78 | lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(), | |
79 | lirc->gap_start)); | |
80 | ||
81 | /* Convert to ms and cap by LIRC_VALUE_MASK */ | |
82 | do_div(lirc->gap_duration, 1000); | |
83 | lirc->gap_duration = min(lirc->gap_duration, | |
84 | (u64)LIRC_VALUE_MASK); | |
85 | ||
86 | gap_sample = LIRC_SPACE(lirc->gap_duration); | |
d8b4b582 | 87 | lirc_buffer_write(dev->raw->lirc.drv->rbuf, |
4651918a ML |
88 | (unsigned char *) &gap_sample); |
89 | lirc->gap = false; | |
90 | } | |
91 | ||
92 | sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) : | |
93 | LIRC_SPACE(ev.duration / 1000); | |
457e2ffc JW |
94 | IR_dprintk(2, "delivering %uus %s to lirc_dev\n", |
95 | TO_US(ev.duration), TO_STR(ev.pulse)); | |
4651918a | 96 | } |
ca414698 | 97 | |
d8b4b582 | 98 | lirc_buffer_write(dev->raw->lirc.drv->rbuf, |
510fcb70 | 99 | (unsigned char *) &sample); |
d8b4b582 | 100 | wake_up(&dev->raw->lirc.drv->rbuf->wait_poll); |
ca414698 | 101 | |
ca414698 JW |
102 | return 0; |
103 | } | |
104 | ||
06bd801c | 105 | static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf, |
ca414698 JW |
106 | size_t n, loff_t *ppos) |
107 | { | |
108 | struct lirc_codec *lirc; | |
d8b4b582 | 109 | struct rc_dev *dev; |
5588dc2b | 110 | unsigned int *txbuf; /* buffer with values to transmit */ |
d07df223 | 111 | ssize_t ret = -EINVAL; |
4c8b8698 | 112 | size_t count; |
f8e00d5f DH |
113 | ktime_t start; |
114 | s64 towait; | |
115 | unsigned int duration = 0; /* signal duration in us */ | |
116 | int i; | |
117 | ||
118 | start = ktime_get(); | |
ca414698 JW |
119 | |
120 | lirc = lirc_get_pdata(file); | |
121 | if (!lirc) | |
122 | return -EFAULT; | |
123 | ||
5588dc2b | 124 | if (n < sizeof(unsigned) || n % sizeof(unsigned)) |
ca414698 JW |
125 | return -EINVAL; |
126 | ||
5588dc2b DH |
127 | count = n / sizeof(unsigned); |
128 | if (count > LIRCBUF_SIZE || count % 2 == 0) | |
ca414698 JW |
129 | return -EINVAL; |
130 | ||
6efb870a JW |
131 | txbuf = memdup_user(buf, n); |
132 | if (IS_ERR(txbuf)) | |
133 | return PTR_ERR(txbuf); | |
ca414698 | 134 | |
d8b4b582 DH |
135 | dev = lirc->dev; |
136 | if (!dev) { | |
ca414698 JW |
137 | ret = -EFAULT; |
138 | goto out; | |
139 | } | |
140 | ||
f8e00d5f DH |
141 | if (!dev->tx_ir) { |
142 | ret = -ENOSYS; | |
143 | goto out; | |
144 | } | |
145 | ||
25379bf8 SY |
146 | for (i = 0; i < count; i++) { |
147 | if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) { | |
148 | ret = -EINVAL; | |
149 | goto out; | |
150 | } | |
151 | ||
152 | duration += txbuf[i]; | |
153 | } | |
154 | ||
586c61fd | 155 | ret = dev->tx_ir(dev, txbuf, count); |
f8e00d5f DH |
156 | if (ret < 0) |
157 | goto out; | |
158 | ||
25379bf8 | 159 | for (duration = i = 0; i < ret; i++) |
f8e00d5f | 160 | duration += txbuf[i]; |
5588dc2b | 161 | |
f8e00d5f DH |
162 | ret *= sizeof(unsigned int); |
163 | ||
164 | /* | |
165 | * The lircd gap calculation expects the write function to | |
166 | * wait for the actual IR signal to be transmitted before | |
167 | * returning. | |
168 | */ | |
169 | towait = ktime_us_delta(ktime_add_us(start, duration), ktime_get()); | |
170 | if (towait > 0) { | |
171 | set_current_state(TASK_INTERRUPTIBLE); | |
172 | schedule_timeout(usecs_to_jiffies(towait)); | |
173 | } | |
ca414698 JW |
174 | |
175 | out: | |
176 | kfree(txbuf); | |
177 | return ret; | |
178 | } | |
179 | ||
e589333f | 180 | static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, |
06bd801c | 181 | unsigned long arg) |
ca414698 JW |
182 | { |
183 | struct lirc_codec *lirc; | |
d8b4b582 | 184 | struct rc_dev *dev; |
06bd801c | 185 | u32 __user *argp = (u32 __user *)(arg); |
ca414698 | 186 | int ret = 0; |
4651918a | 187 | __u32 val = 0, tmp; |
ca414698 JW |
188 | |
189 | lirc = lirc_get_pdata(filep); | |
190 | if (!lirc) | |
191 | return -EFAULT; | |
192 | ||
d8b4b582 DH |
193 | dev = lirc->dev; |
194 | if (!dev) | |
ca414698 JW |
195 | return -EFAULT; |
196 | ||
e589333f | 197 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
06bd801c | 198 | ret = get_user(val, argp); |
ca414698 JW |
199 | if (ret) |
200 | return ret; | |
e589333f ML |
201 | } |
202 | ||
203 | switch (cmd) { | |
204 | ||
205 | /* legacy support */ | |
206 | case LIRC_GET_SEND_MODE: | |
207 | val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK; | |
208 | break; | |
209 | ||
210 | case LIRC_SET_SEND_MODE: | |
211 | if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK)) | |
212 | return -EINVAL; | |
4651918a | 213 | return 0; |
ca414698 | 214 | |
e589333f ML |
215 | /* TX settings */ |
216 | case LIRC_SET_TRANSMITTER_MASK: | |
d8b4b582 | 217 | if (!dev->s_tx_mask) |
5f49908a | 218 | return -ENOSYS; |
4651918a | 219 | |
d8b4b582 | 220 | return dev->s_tx_mask(dev, val); |
ca414698 JW |
221 | |
222 | case LIRC_SET_SEND_CARRIER: | |
d8b4b582 | 223 | if (!dev->s_tx_carrier) |
5f49908a | 224 | return -ENOSYS; |
4651918a | 225 | |
d8b4b582 | 226 | return dev->s_tx_carrier(dev, val); |
ca414698 | 227 | |
e589333f | 228 | case LIRC_SET_SEND_DUTY_CYCLE: |
d8b4b582 | 229 | if (!dev->s_tx_duty_cycle) |
e589333f ML |
230 | return -ENOSYS; |
231 | ||
232 | if (val <= 0 || val >= 100) | |
233 | return -EINVAL; | |
234 | ||
d8b4b582 | 235 | return dev->s_tx_duty_cycle(dev, val); |
ca414698 | 236 | |
e589333f ML |
237 | /* RX settings */ |
238 | case LIRC_SET_REC_CARRIER: | |
d8b4b582 | 239 | if (!dev->s_rx_carrier_range) |
e589333f | 240 | return -ENOSYS; |
ca414698 | 241 | |
4651918a ML |
242 | if (val <= 0) |
243 | return -EINVAL; | |
244 | ||
d8b4b582 DH |
245 | return dev->s_rx_carrier_range(dev, |
246 | dev->raw->lirc.carrier_low, | |
247 | val); | |
e589333f ML |
248 | |
249 | case LIRC_SET_REC_CARRIER_RANGE: | |
4651918a ML |
250 | if (val <= 0) |
251 | return -EINVAL; | |
e589333f | 252 | |
d8b4b582 | 253 | dev->raw->lirc.carrier_low = val; |
4651918a | 254 | return 0; |
e589333f ML |
255 | |
256 | case LIRC_GET_REC_RESOLUTION: | |
d8b4b582 | 257 | val = dev->rx_resolution; |
e589333f ML |
258 | break; |
259 | ||
260 | case LIRC_SET_WIDEBAND_RECEIVER: | |
d8b4b582 | 261 | if (!dev->s_learning_mode) |
e589333f ML |
262 | return -ENOSYS; |
263 | ||
d8b4b582 | 264 | return dev->s_learning_mode(dev, !!val); |
4651918a ML |
265 | |
266 | case LIRC_SET_MEASURE_CARRIER_MODE: | |
d8b4b582 | 267 | if (!dev->s_carrier_report) |
4651918a ML |
268 | return -ENOSYS; |
269 | ||
d8b4b582 | 270 | return dev->s_carrier_report(dev, !!val); |
4651918a | 271 | |
e589333f ML |
272 | /* Generic timeout support */ |
273 | case LIRC_GET_MIN_TIMEOUT: | |
d8b4b582 | 274 | if (!dev->max_timeout) |
e589333f | 275 | return -ENOSYS; |
d8b4b582 | 276 | val = dev->min_timeout / 1000; |
e589333f ML |
277 | break; |
278 | ||
279 | case LIRC_GET_MAX_TIMEOUT: | |
d8b4b582 | 280 | if (!dev->max_timeout) |
e589333f | 281 | return -ENOSYS; |
d8b4b582 | 282 | val = dev->max_timeout / 1000; |
e589333f ML |
283 | break; |
284 | ||
285 | case LIRC_SET_REC_TIMEOUT: | |
d8b4b582 | 286 | if (!dev->max_timeout) |
4651918a ML |
287 | return -ENOSYS; |
288 | ||
289 | tmp = val * 1000; | |
290 | ||
d8b4b582 DH |
291 | if (tmp < dev->min_timeout || |
292 | tmp > dev->max_timeout) | |
4651918a ML |
293 | return -EINVAL; |
294 | ||
d8b4b582 | 295 | dev->timeout = tmp; |
4651918a ML |
296 | break; |
297 | ||
298 | case LIRC_SET_REC_TIMEOUT_REPORTS: | |
299 | lirc->send_timeout_reports = !!val; | |
ca414698 JW |
300 | break; |
301 | ||
302 | default: | |
044e5878 | 303 | return lirc_dev_fop_ioctl(filep, cmd, arg); |
ca414698 JW |
304 | } |
305 | ||
e589333f | 306 | if (_IOC_DIR(cmd) & _IOC_READ) |
06bd801c | 307 | ret = put_user(val, argp); |
e589333f | 308 | |
ca414698 JW |
309 | return ret; |
310 | } | |
311 | ||
312 | static int ir_lirc_open(void *data) | |
313 | { | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static void ir_lirc_close(void *data) | |
318 | { | |
319 | return; | |
320 | } | |
321 | ||
75ef9de1 | 322 | static const struct file_operations lirc_fops = { |
ca414698 JW |
323 | .owner = THIS_MODULE, |
324 | .write = ir_lirc_transmit_ir, | |
044e5878 | 325 | .unlocked_ioctl = ir_lirc_ioctl, |
8be292cc JW |
326 | #ifdef CONFIG_COMPAT |
327 | .compat_ioctl = ir_lirc_ioctl, | |
328 | #endif | |
ca414698 JW |
329 | .read = lirc_dev_fop_read, |
330 | .poll = lirc_dev_fop_poll, | |
331 | .open = lirc_dev_fop_open, | |
332 | .release = lirc_dev_fop_close, | |
d9d2e9d5 | 333 | .llseek = no_llseek, |
ca414698 JW |
334 | }; |
335 | ||
d8b4b582 | 336 | static int ir_lirc_register(struct rc_dev *dev) |
ca414698 | 337 | { |
ca414698 JW |
338 | struct lirc_driver *drv; |
339 | struct lirc_buffer *rbuf; | |
340 | int rc = -ENOMEM; | |
341 | unsigned long features; | |
342 | ||
343 | drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL); | |
344 | if (!drv) | |
345 | return rc; | |
346 | ||
347 | rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
49b7a12c | 348 | if (!rbuf) |
ca414698 JW |
349 | goto rbuf_alloc_failed; |
350 | ||
351 | rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE); | |
352 | if (rc) | |
353 | goto rbuf_init_failed; | |
354 | ||
355 | features = LIRC_CAN_REC_MODE2; | |
d8b4b582 | 356 | if (dev->tx_ir) { |
ca414698 | 357 | features |= LIRC_CAN_SEND_PULSE; |
d8b4b582 | 358 | if (dev->s_tx_mask) |
ca414698 | 359 | features |= LIRC_CAN_SET_TRANSMITTER_MASK; |
d8b4b582 | 360 | if (dev->s_tx_carrier) |
ca414698 | 361 | features |= LIRC_CAN_SET_SEND_CARRIER; |
d8b4b582 | 362 | if (dev->s_tx_duty_cycle) |
67332ba8 | 363 | features |= LIRC_CAN_SET_SEND_DUTY_CYCLE; |
ca414698 JW |
364 | } |
365 | ||
d8b4b582 | 366 | if (dev->s_rx_carrier_range) |
e589333f ML |
367 | features |= LIRC_CAN_SET_REC_CARRIER | |
368 | LIRC_CAN_SET_REC_CARRIER_RANGE; | |
369 | ||
d8b4b582 | 370 | if (dev->s_learning_mode) |
e589333f ML |
371 | features |= LIRC_CAN_USE_WIDEBAND_RECEIVER; |
372 | ||
d8b4b582 | 373 | if (dev->s_carrier_report) |
4651918a ML |
374 | features |= LIRC_CAN_MEASURE_CARRIER; |
375 | ||
d8b4b582 | 376 | if (dev->max_timeout) |
e589333f ML |
377 | features |= LIRC_CAN_SET_REC_TIMEOUT; |
378 | ||
ca414698 | 379 | snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)", |
d8b4b582 | 380 | dev->driver_name); |
ca414698 JW |
381 | drv->minor = -1; |
382 | drv->features = features; | |
d8b4b582 | 383 | drv->data = &dev->raw->lirc; |
ca414698 JW |
384 | drv->rbuf = rbuf; |
385 | drv->set_use_inc = &ir_lirc_open; | |
386 | drv->set_use_dec = &ir_lirc_close; | |
387 | drv->code_length = sizeof(struct ir_raw_event) * 8; | |
388 | drv->fops = &lirc_fops; | |
d8b4b582 | 389 | drv->dev = &dev->dev; |
ca7a722d | 390 | drv->rdev = dev; |
ca414698 JW |
391 | drv->owner = THIS_MODULE; |
392 | ||
393 | drv->minor = lirc_register_driver(drv); | |
394 | if (drv->minor < 0) { | |
395 | rc = -ENODEV; | |
396 | goto lirc_register_failed; | |
397 | } | |
398 | ||
d8b4b582 DH |
399 | dev->raw->lirc.drv = drv; |
400 | dev->raw->lirc.dev = dev; | |
ca414698 JW |
401 | return 0; |
402 | ||
403 | lirc_register_failed: | |
404 | rbuf_init_failed: | |
405 | kfree(rbuf); | |
406 | rbuf_alloc_failed: | |
407 | kfree(drv); | |
408 | ||
409 | return rc; | |
410 | } | |
411 | ||
d8b4b582 | 412 | static int ir_lirc_unregister(struct rc_dev *dev) |
ca414698 | 413 | { |
d8b4b582 | 414 | struct lirc_codec *lirc = &dev->raw->lirc; |
ca414698 JW |
415 | |
416 | lirc_unregister_driver(lirc->drv->minor); | |
417 | lirc_buffer_free(lirc->drv->rbuf); | |
418 | kfree(lirc->drv); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | static struct ir_raw_handler lirc_handler = { | |
275ddb40 | 424 | .protocols = 0, |
ca414698 JW |
425 | .decode = ir_lirc_decode, |
426 | .raw_register = ir_lirc_register, | |
427 | .raw_unregister = ir_lirc_unregister, | |
428 | }; | |
429 | ||
430 | static int __init ir_lirc_codec_init(void) | |
431 | { | |
432 | ir_raw_handler_register(&lirc_handler); | |
433 | ||
434 | printk(KERN_INFO "IR LIRC bridge handler initialized\n"); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static void __exit ir_lirc_codec_exit(void) | |
439 | { | |
440 | ir_raw_handler_unregister(&lirc_handler); | |
441 | } | |
442 | ||
443 | module_init(ir_lirc_codec_init); | |
444 | module_exit(ir_lirc_codec_exit); | |
445 | ||
446 | MODULE_LICENSE("GPL"); | |
447 | MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>"); | |
448 | MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); | |
449 | MODULE_DESCRIPTION("LIRC IR handler bridge"); |