1 /* ir-lirc-codec.c - rc-core to classic lirc interface bridge
3 * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
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.
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.
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"
23 #define LIRCBUF_SIZE 256
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
31 * This function returns -EINVAL if the lirc interfaces aren't wired up.
33 static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
35 struct lirc_codec *lirc = &dev->raw->lirc;
38 if (!(dev->raw->enabled_protocols & RC_TYPE_LIRC))
41 if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
49 if (ev.carrier_report) {
50 sample = LIRC_FREQUENCY(ev.carrier);
51 IR_dprintk(2, "carrier report (freq: %d)\n", sample);
54 } else if (ev.timeout) {
59 lirc->gap_start = ktime_get();
61 lirc->gap_duration = ev.duration;
63 if (!lirc->send_timeout_reports)
66 sample = LIRC_TIMEOUT(ev.duration / 1000);
67 IR_dprintk(2, "timeout report (duration: %d)\n", sample);
75 lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
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);
83 gap_sample = LIRC_SPACE(lirc->gap_duration);
84 lirc_buffer_write(dev->raw->lirc.drv->rbuf,
85 (unsigned char *) &gap_sample);
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));
95 lirc_buffer_write(dev->raw->lirc.drv->rbuf,
96 (unsigned char *) &sample);
97 wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);
102 static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
103 size_t n, loff_t *ppos)
105 struct lirc_codec *lirc;
107 unsigned int *txbuf; /* buffer with values to transmit */
108 ssize_t ret = -EINVAL;
112 unsigned int duration = 0; /* signal duration in us */
117 lirc = lirc_get_pdata(file);
121 if (n < sizeof(unsigned) || n % sizeof(unsigned))
124 count = n / sizeof(unsigned);
125 if (count > LIRCBUF_SIZE || count % 2 == 0)
128 txbuf = memdup_user(buf, n);
130 return PTR_ERR(txbuf);
143 ret = dev->tx_ir(dev, txbuf, count);
147 for (i = 0; i < ret; i++)
148 duration += txbuf[i];
150 ret *= sizeof(unsigned int);
153 * The lircd gap calculation expects the write function to
154 * wait for the actual IR signal to be transmitted before
157 towait = ktime_us_delta(ktime_add_us(start, duration), ktime_get());
159 set_current_state(TASK_INTERRUPTIBLE);
160 schedule_timeout(usecs_to_jiffies(towait));
168 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
171 struct lirc_codec *lirc;
173 u32 __user *argp = (u32 __user *)(arg);
177 lirc = lirc_get_pdata(filep);
185 if (_IOC_DIR(cmd) & _IOC_WRITE) {
186 ret = get_user(val, argp);
194 case LIRC_GET_SEND_MODE:
195 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
198 case LIRC_SET_SEND_MODE:
199 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
204 case LIRC_SET_TRANSMITTER_MASK:
208 return dev->s_tx_mask(dev, val);
210 case LIRC_SET_SEND_CARRIER:
211 if (!dev->s_tx_carrier)
214 return dev->s_tx_carrier(dev, val);
216 case LIRC_SET_SEND_DUTY_CYCLE:
217 if (!dev->s_tx_duty_cycle)
220 if (val <= 0 || val >= 100)
223 return dev->s_tx_duty_cycle(dev, val);
226 case LIRC_SET_REC_CARRIER:
227 if (!dev->s_rx_carrier_range)
233 return dev->s_rx_carrier_range(dev,
234 dev->raw->lirc.carrier_low,
237 case LIRC_SET_REC_CARRIER_RANGE:
241 dev->raw->lirc.carrier_low = val;
244 case LIRC_GET_REC_RESOLUTION:
245 val = dev->rx_resolution;
248 case LIRC_SET_WIDEBAND_RECEIVER:
249 if (!dev->s_learning_mode)
252 return dev->s_learning_mode(dev, !!val);
254 case LIRC_SET_MEASURE_CARRIER_MODE:
255 if (!dev->s_carrier_report)
258 return dev->s_carrier_report(dev, !!val);
260 /* Generic timeout support */
261 case LIRC_GET_MIN_TIMEOUT:
262 if (!dev->max_timeout)
264 val = dev->min_timeout / 1000;
267 case LIRC_GET_MAX_TIMEOUT:
268 if (!dev->max_timeout)
270 val = dev->max_timeout / 1000;
273 case LIRC_SET_REC_TIMEOUT:
274 if (!dev->max_timeout)
279 if (tmp < dev->min_timeout ||
280 tmp > dev->max_timeout)
286 case LIRC_SET_REC_TIMEOUT_REPORTS:
287 lirc->send_timeout_reports = !!val;
291 return lirc_dev_fop_ioctl(filep, cmd, arg);
294 if (_IOC_DIR(cmd) & _IOC_READ)
295 ret = put_user(val, argp);
300 static int ir_lirc_open(void *data)
305 static void ir_lirc_close(void *data)
310 static struct file_operations lirc_fops = {
311 .owner = THIS_MODULE,
312 .write = ir_lirc_transmit_ir,
313 .unlocked_ioctl = ir_lirc_ioctl,
315 .compat_ioctl = ir_lirc_ioctl,
317 .read = lirc_dev_fop_read,
318 .poll = lirc_dev_fop_poll,
319 .open = lirc_dev_fop_open,
320 .release = lirc_dev_fop_close,
324 static int ir_lirc_register(struct rc_dev *dev)
326 struct lirc_driver *drv;
327 struct lirc_buffer *rbuf;
329 unsigned long features;
331 drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
335 rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
337 goto rbuf_alloc_failed;
339 rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
341 goto rbuf_init_failed;
343 features = LIRC_CAN_REC_MODE2;
345 features |= LIRC_CAN_SEND_PULSE;
347 features |= LIRC_CAN_SET_TRANSMITTER_MASK;
348 if (dev->s_tx_carrier)
349 features |= LIRC_CAN_SET_SEND_CARRIER;
350 if (dev->s_tx_duty_cycle)
351 features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
354 if (dev->s_rx_carrier_range)
355 features |= LIRC_CAN_SET_REC_CARRIER |
356 LIRC_CAN_SET_REC_CARRIER_RANGE;
358 if (dev->s_learning_mode)
359 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
361 if (dev->s_carrier_report)
362 features |= LIRC_CAN_MEASURE_CARRIER;
364 if (dev->max_timeout)
365 features |= LIRC_CAN_SET_REC_TIMEOUT;
367 snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
370 drv->features = features;
371 drv->data = &dev->raw->lirc;
373 drv->set_use_inc = &ir_lirc_open;
374 drv->set_use_dec = &ir_lirc_close;
375 drv->code_length = sizeof(struct ir_raw_event) * 8;
376 drv->fops = &lirc_fops;
377 drv->dev = &dev->dev;
378 drv->owner = THIS_MODULE;
380 drv->minor = lirc_register_driver(drv);
381 if (drv->minor < 0) {
383 goto lirc_register_failed;
386 dev->raw->lirc.drv = drv;
387 dev->raw->lirc.dev = dev;
390 lirc_register_failed:
399 static int ir_lirc_unregister(struct rc_dev *dev)
401 struct lirc_codec *lirc = &dev->raw->lirc;
403 lirc_unregister_driver(lirc->drv->minor);
404 lirc_buffer_free(lirc->drv->rbuf);
410 static struct ir_raw_handler lirc_handler = {
411 .protocols = RC_TYPE_LIRC,
412 .decode = ir_lirc_decode,
413 .raw_register = ir_lirc_register,
414 .raw_unregister = ir_lirc_unregister,
417 static int __init ir_lirc_codec_init(void)
419 ir_raw_handler_register(&lirc_handler);
421 printk(KERN_INFO "IR LIRC bridge handler initialized\n");
425 static void __exit ir_lirc_codec_exit(void)
427 ir_raw_handler_unregister(&lirc_handler);
430 module_init(ir_lirc_codec_init);
431 module_exit(ir_lirc_codec_exit);
433 MODULE_LICENSE("GPL");
434 MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
435 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
436 MODULE_DESCRIPTION("LIRC IR handler bridge");