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 */
111 lirc = lirc_get_pdata(file);
115 if (n < sizeof(unsigned) || n % sizeof(unsigned))
118 count = n / sizeof(unsigned);
119 if (count > LIRCBUF_SIZE || count % 2 == 0)
122 txbuf = memdup_user(buf, n);
124 return PTR_ERR(txbuf);
133 ret = dev->tx_ir(dev, txbuf, count);
136 ret *= sizeof(unsigned);
143 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
146 struct lirc_codec *lirc;
148 u32 __user *argp = (u32 __user *)(arg);
152 lirc = lirc_get_pdata(filep);
160 if (_IOC_DIR(cmd) & _IOC_WRITE) {
161 ret = get_user(val, argp);
169 case LIRC_GET_SEND_MODE:
170 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
173 case LIRC_SET_SEND_MODE:
174 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
179 case LIRC_SET_TRANSMITTER_MASK:
183 return dev->s_tx_mask(dev, val);
185 case LIRC_SET_SEND_CARRIER:
186 if (!dev->s_tx_carrier)
189 return dev->s_tx_carrier(dev, val);
191 case LIRC_SET_SEND_DUTY_CYCLE:
192 if (!dev->s_tx_duty_cycle)
195 if (val <= 0 || val >= 100)
198 return dev->s_tx_duty_cycle(dev, val);
201 case LIRC_SET_REC_CARRIER:
202 if (!dev->s_rx_carrier_range)
208 return dev->s_rx_carrier_range(dev,
209 dev->raw->lirc.carrier_low,
212 case LIRC_SET_REC_CARRIER_RANGE:
216 dev->raw->lirc.carrier_low = val;
219 case LIRC_GET_REC_RESOLUTION:
220 val = dev->rx_resolution;
223 case LIRC_SET_WIDEBAND_RECEIVER:
224 if (!dev->s_learning_mode)
227 return dev->s_learning_mode(dev, !!val);
229 case LIRC_SET_MEASURE_CARRIER_MODE:
230 if (!dev->s_carrier_report)
233 return dev->s_carrier_report(dev, !!val);
235 /* Generic timeout support */
236 case LIRC_GET_MIN_TIMEOUT:
237 if (!dev->max_timeout)
239 val = dev->min_timeout / 1000;
242 case LIRC_GET_MAX_TIMEOUT:
243 if (!dev->max_timeout)
245 val = dev->max_timeout / 1000;
248 case LIRC_SET_REC_TIMEOUT:
249 if (!dev->max_timeout)
254 if (tmp < dev->min_timeout ||
255 tmp > dev->max_timeout)
261 case LIRC_SET_REC_TIMEOUT_REPORTS:
262 lirc->send_timeout_reports = !!val;
266 return lirc_dev_fop_ioctl(filep, cmd, arg);
269 if (_IOC_DIR(cmd) & _IOC_READ)
270 ret = put_user(val, argp);
275 static int ir_lirc_open(void *data)
280 static void ir_lirc_close(void *data)
285 static struct file_operations lirc_fops = {
286 .owner = THIS_MODULE,
287 .write = ir_lirc_transmit_ir,
288 .unlocked_ioctl = ir_lirc_ioctl,
290 .compat_ioctl = ir_lirc_ioctl,
292 .read = lirc_dev_fop_read,
293 .poll = lirc_dev_fop_poll,
294 .open = lirc_dev_fop_open,
295 .release = lirc_dev_fop_close,
299 static int ir_lirc_register(struct rc_dev *dev)
301 struct lirc_driver *drv;
302 struct lirc_buffer *rbuf;
304 unsigned long features;
306 drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
310 rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
312 goto rbuf_alloc_failed;
314 rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
316 goto rbuf_init_failed;
318 features = LIRC_CAN_REC_MODE2;
320 features |= LIRC_CAN_SEND_PULSE;
322 features |= LIRC_CAN_SET_TRANSMITTER_MASK;
323 if (dev->s_tx_carrier)
324 features |= LIRC_CAN_SET_SEND_CARRIER;
325 if (dev->s_tx_duty_cycle)
326 features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
329 if (dev->s_rx_carrier_range)
330 features |= LIRC_CAN_SET_REC_CARRIER |
331 LIRC_CAN_SET_REC_CARRIER_RANGE;
333 if (dev->s_learning_mode)
334 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
336 if (dev->s_carrier_report)
337 features |= LIRC_CAN_MEASURE_CARRIER;
339 if (dev->max_timeout)
340 features |= LIRC_CAN_SET_REC_TIMEOUT;
342 snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
345 drv->features = features;
346 drv->data = &dev->raw->lirc;
348 drv->set_use_inc = &ir_lirc_open;
349 drv->set_use_dec = &ir_lirc_close;
350 drv->code_length = sizeof(struct ir_raw_event) * 8;
351 drv->fops = &lirc_fops;
352 drv->dev = &dev->dev;
353 drv->owner = THIS_MODULE;
355 drv->minor = lirc_register_driver(drv);
356 if (drv->minor < 0) {
358 goto lirc_register_failed;
361 dev->raw->lirc.drv = drv;
362 dev->raw->lirc.dev = dev;
365 lirc_register_failed:
374 static int ir_lirc_unregister(struct rc_dev *dev)
376 struct lirc_codec *lirc = &dev->raw->lirc;
378 lirc_unregister_driver(lirc->drv->minor);
379 lirc_buffer_free(lirc->drv->rbuf);
385 static struct ir_raw_handler lirc_handler = {
386 .protocols = RC_TYPE_LIRC,
387 .decode = ir_lirc_decode,
388 .raw_register = ir_lirc_register,
389 .raw_unregister = ir_lirc_unregister,
392 static int __init ir_lirc_codec_init(void)
394 ir_raw_handler_register(&lirc_handler);
396 printk(KERN_INFO "IR LIRC bridge handler initialized\n");
400 static void __exit ir_lirc_codec_exit(void)
402 ir_raw_handler_unregister(&lirc_handler);
405 module_init(ir_lirc_codec_init);
406 module_exit(ir_lirc_codec_exit);
408 MODULE_LICENSE("GPL");
409 MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
410 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
411 MODULE_DESCRIPTION("LIRC IR handler bridge");