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1/* ir-lirc-codec.c - rc-core to classic lirc interface bridge
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>
17#include <linux/module.h>
18#include <media/lirc.h>
19#include <media/lirc_dev.h>
20#include <media/rc-core.h>
21#include "rc-core-priv.h"
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.
28 * @input_dev: the struct rc_dev descriptor of the device
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 */
33static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
34{
35 struct lirc_codec *lirc = &dev->raw->lirc;
36 int sample;
37
38 if (!rc_protocols_enabled(dev, RC_BIT_LIRC))
39 return 0;
40
41 if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
42 return -EINVAL;
43
44 /* Packet start */
45 if (ev.reset)
46 return 0;
47
48 /* Carrier reports */
49 if (ev.carrier_report) {
50 sample = LIRC_FREQUENCY(ev.carrier);
51 IR_dprintk(2, "carrier report (freq: %d)\n", sample);
52
53 /* Packet end */
54 } else if (ev.timeout) {
55
56 if (lirc->gap)
57 return 0;
58
59 lirc->gap_start = ktime_get();
60 lirc->gap = true;
61 lirc->gap_duration = ev.duration;
62
63 if (!lirc->send_timeout_reports)
64 return 0;
65
66 sample = LIRC_TIMEOUT(ev.duration / 1000);
67 IR_dprintk(2, "timeout report (duration: %d)\n", sample);
68
69 /* Normal sample */
70 } else {
71
72 if (lirc->gap) {
73 int gap_sample;
74
75 lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
76 lirc->gap_start));
77
78 /* Convert to ms and cap by LIRC_VALUE_MASK */
79 do_div(lirc->gap_duration, 1000);
80 lirc->gap_duration = min(lirc->gap_duration,
81 (u64)LIRC_VALUE_MASK);
82
83 gap_sample = LIRC_SPACE(lirc->gap_duration);
84 lirc_buffer_write(dev->raw->lirc.drv->rbuf,
85 (unsigned char *) &gap_sample);
86 lirc->gap = false;
87 }
88
89 sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
90 LIRC_SPACE(ev.duration / 1000);
91 IR_dprintk(2, "delivering %uus %s to lirc_dev\n",
92 TO_US(ev.duration), TO_STR(ev.pulse));
93 }
94
95 lirc_buffer_write(dev->raw->lirc.drv->rbuf,
96 (unsigned char *) &sample);
97 wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);
98
99 return 0;
100}
101
102static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
103 size_t n, loff_t *ppos)
104{
105 struct lirc_codec *lirc;
106 struct rc_dev *dev;
107 unsigned int *txbuf; /* buffer with values to transmit */
108 ssize_t ret = -EINVAL;
109 size_t count;
110 ktime_t start;
111 s64 towait;
112 unsigned int duration = 0; /* signal duration in us */
113 int i;
114
115 start = ktime_get();
116
117 lirc = lirc_get_pdata(file);
118 if (!lirc)
119 return -EFAULT;
120
121 if (n < sizeof(unsigned) || n % sizeof(unsigned))
122 return -EINVAL;
123
124 count = n / sizeof(unsigned);
125 if (count > LIRCBUF_SIZE || count % 2 == 0)
126 return -EINVAL;
127
128 txbuf = memdup_user(buf, n);
129 if (IS_ERR(txbuf))
130 return PTR_ERR(txbuf);
131
132 dev = lirc->dev;
133 if (!dev) {
134 ret = -EFAULT;
135 goto out;
136 }
137
138 if (!dev->tx_ir) {
139 ret = -ENOSYS;
140 goto out;
141 }
142
143 for (i = 0; i < count; i++) {
144 if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) {
145 ret = -EINVAL;
146 goto out;
147 }
148
149 duration += txbuf[i];
150 }
151
152 ret = dev->tx_ir(dev, txbuf, count);
153 if (ret < 0)
154 goto out;
155
156 for (duration = i = 0; i < ret; i++)
157 duration += txbuf[i];
158
159 ret *= sizeof(unsigned int);
160
161 /*
162 * The lircd gap calculation expects the write function to
163 * wait for the actual IR signal to be transmitted before
164 * returning.
165 */
166 towait = ktime_us_delta(ktime_add_us(start, duration), ktime_get());
167 if (towait > 0) {
168 set_current_state(TASK_INTERRUPTIBLE);
169 schedule_timeout(usecs_to_jiffies(towait));
170 }
171
172out:
173 kfree(txbuf);
174 return ret;
175}
176
177static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
178 unsigned long arg)
179{
180 struct lirc_codec *lirc;
181 struct rc_dev *dev;
182 u32 __user *argp = (u32 __user *)(arg);
183 int ret = 0;
184 __u32 val = 0, tmp;
185
186 lirc = lirc_get_pdata(filep);
187 if (!lirc)
188 return -EFAULT;
189
190 dev = lirc->dev;
191 if (!dev)
192 return -EFAULT;
193
194 if (_IOC_DIR(cmd) & _IOC_WRITE) {
195 ret = get_user(val, argp);
196 if (ret)
197 return ret;
198 }
199
200 switch (cmd) {
201
202 /* legacy support */
203 case LIRC_GET_SEND_MODE:
204 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
205 break;
206
207 case LIRC_SET_SEND_MODE:
208 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
209 return -EINVAL;
210 return 0;
211
212 /* TX settings */
213 case LIRC_SET_TRANSMITTER_MASK:
214 if (!dev->s_tx_mask)
215 return -ENOSYS;
216
217 return dev->s_tx_mask(dev, val);
218
219 case LIRC_SET_SEND_CARRIER:
220 if (!dev->s_tx_carrier)
221 return -ENOSYS;
222
223 return dev->s_tx_carrier(dev, val);
224
225 case LIRC_SET_SEND_DUTY_CYCLE:
226 if (!dev->s_tx_duty_cycle)
227 return -ENOSYS;
228
229 if (val <= 0 || val >= 100)
230 return -EINVAL;
231
232 return dev->s_tx_duty_cycle(dev, val);
233
234 /* RX settings */
235 case LIRC_SET_REC_CARRIER:
236 if (!dev->s_rx_carrier_range)
237 return -ENOSYS;
238
239 if (val <= 0)
240 return -EINVAL;
241
242 return dev->s_rx_carrier_range(dev,
243 dev->raw->lirc.carrier_low,
244 val);
245
246 case LIRC_SET_REC_CARRIER_RANGE:
247 if (val <= 0)
248 return -EINVAL;
249
250 dev->raw->lirc.carrier_low = val;
251 return 0;
252
253 case LIRC_GET_REC_RESOLUTION:
254 val = dev->rx_resolution;
255 break;
256
257 case LIRC_SET_WIDEBAND_RECEIVER:
258 if (!dev->s_learning_mode)
259 return -ENOSYS;
260
261 return dev->s_learning_mode(dev, !!val);
262
263 case LIRC_SET_MEASURE_CARRIER_MODE:
264 if (!dev->s_carrier_report)
265 return -ENOSYS;
266
267 return dev->s_carrier_report(dev, !!val);
268
269 /* Generic timeout support */
270 case LIRC_GET_MIN_TIMEOUT:
271 if (!dev->max_timeout)
272 return -ENOSYS;
273 val = dev->min_timeout / 1000;
274 break;
275
276 case LIRC_GET_MAX_TIMEOUT:
277 if (!dev->max_timeout)
278 return -ENOSYS;
279 val = dev->max_timeout / 1000;
280 break;
281
282 case LIRC_SET_REC_TIMEOUT:
283 if (!dev->max_timeout)
284 return -ENOSYS;
285
286 tmp = val * 1000;
287
288 if (tmp < dev->min_timeout ||
289 tmp > dev->max_timeout)
290 return -EINVAL;
291
292 dev->timeout = tmp;
293 break;
294
295 case LIRC_SET_REC_TIMEOUT_REPORTS:
296 lirc->send_timeout_reports = !!val;
297 break;
298
299 default:
300 return lirc_dev_fop_ioctl(filep, cmd, arg);
301 }
302
303 if (_IOC_DIR(cmd) & _IOC_READ)
304 ret = put_user(val, argp);
305
306 return ret;
307}
308
309static int ir_lirc_open(void *data)
310{
311 return 0;
312}
313
314static void ir_lirc_close(void *data)
315{
316 return;
317}
318
319static const struct file_operations lirc_fops = {
320 .owner = THIS_MODULE,
321 .write = ir_lirc_transmit_ir,
322 .unlocked_ioctl = ir_lirc_ioctl,
323#ifdef CONFIG_COMPAT
324 .compat_ioctl = ir_lirc_ioctl,
325#endif
326 .read = lirc_dev_fop_read,
327 .poll = lirc_dev_fop_poll,
328 .open = lirc_dev_fop_open,
329 .release = lirc_dev_fop_close,
330 .llseek = no_llseek,
331};
332
333static int ir_lirc_register(struct rc_dev *dev)
334{
335 struct lirc_driver *drv;
336 struct lirc_buffer *rbuf;
337 int rc = -ENOMEM;
338 unsigned long features;
339
340 drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
341 if (!drv)
342 return rc;
343
344 rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
345 if (!rbuf)
346 goto rbuf_alloc_failed;
347
348 rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
349 if (rc)
350 goto rbuf_init_failed;
351
352 features = LIRC_CAN_REC_MODE2;
353 if (dev->tx_ir) {
354 features |= LIRC_CAN_SEND_PULSE;
355 if (dev->s_tx_mask)
356 features |= LIRC_CAN_SET_TRANSMITTER_MASK;
357 if (dev->s_tx_carrier)
358 features |= LIRC_CAN_SET_SEND_CARRIER;
359 if (dev->s_tx_duty_cycle)
360 features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
361 }
362
363 if (dev->s_rx_carrier_range)
364 features |= LIRC_CAN_SET_REC_CARRIER |
365 LIRC_CAN_SET_REC_CARRIER_RANGE;
366
367 if (dev->s_learning_mode)
368 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
369
370 if (dev->s_carrier_report)
371 features |= LIRC_CAN_MEASURE_CARRIER;
372
373 if (dev->max_timeout)
374 features |= LIRC_CAN_SET_REC_TIMEOUT;
375
376 snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
377 dev->driver_name);
378 drv->minor = -1;
379 drv->features = features;
380 drv->data = &dev->raw->lirc;
381 drv->rbuf = rbuf;
382 drv->set_use_inc = &ir_lirc_open;
383 drv->set_use_dec = &ir_lirc_close;
384 drv->code_length = sizeof(struct ir_raw_event) * 8;
385 drv->fops = &lirc_fops;
386 drv->dev = &dev->dev;
387 drv->rdev = dev;
388 drv->owner = THIS_MODULE;
389
390 drv->minor = lirc_register_driver(drv);
391 if (drv->minor < 0) {
392 rc = -ENODEV;
393 goto lirc_register_failed;
394 }
395
396 dev->raw->lirc.drv = drv;
397 dev->raw->lirc.dev = dev;
398 return 0;
399
400lirc_register_failed:
401rbuf_init_failed:
402 kfree(rbuf);
403rbuf_alloc_failed:
404 kfree(drv);
405
406 return rc;
407}
408
409static int ir_lirc_unregister(struct rc_dev *dev)
410{
411 struct lirc_codec *lirc = &dev->raw->lirc;
412
413 lirc_unregister_driver(lirc->drv->minor);
414 lirc_buffer_free(lirc->drv->rbuf);
415 kfree(lirc->drv);
416
417 return 0;
418}
419
420static struct ir_raw_handler lirc_handler = {
421 .protocols = RC_BIT_LIRC,
422 .decode = ir_lirc_decode,
423 .raw_register = ir_lirc_register,
424 .raw_unregister = ir_lirc_unregister,
425};
426
427static int __init ir_lirc_codec_init(void)
428{
429 ir_raw_handler_register(&lirc_handler);
430
431 printk(KERN_INFO "IR LIRC bridge handler initialized\n");
432 return 0;
433}
434
435static void __exit ir_lirc_codec_exit(void)
436{
437 ir_raw_handler_unregister(&lirc_handler);
438}
439
440module_init(ir_lirc_codec_init);
441module_exit(ir_lirc_codec_exit);
442
443MODULE_LICENSE("GPL");
444MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
445MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
446MODULE_DESCRIPTION("LIRC IR handler bridge");