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 */
ir_lirc_decode(struct rc_dev * dev,struct ir_raw_event ev)33 static 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 (!(dev->raw->enabled_protocols & RC_TYPE_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
ir_lirc_transmit_ir(struct file * file,const char __user * buf,size_t n,loff_t * ppos)102 static 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 = 0;
109 size_t count;
110
111 lirc = lirc_get_pdata(file);
112 if (!lirc)
113 return -EFAULT;
114
115 if (n < sizeof(unsigned) || n % sizeof(unsigned))
116 return -EINVAL;
117
118 count = n / sizeof(unsigned);
119 if (count > LIRCBUF_SIZE || count % 2 == 0)
120 return -EINVAL;
121
122 txbuf = memdup_user(buf, n);
123 if (IS_ERR(txbuf))
124 return PTR_ERR(txbuf);
125
126 dev = lirc->dev;
127 if (!dev) {
128 ret = -EFAULT;
129 goto out;
130 }
131
132 if (dev->tx_ir)
133 ret = dev->tx_ir(dev, txbuf, count);
134
135 if (ret > 0)
136 ret *= sizeof(unsigned);
137
138 out:
139 kfree(txbuf);
140 return ret;
141 }
142
ir_lirc_ioctl(struct file * filep,unsigned int cmd,unsigned long arg)143 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
144 unsigned long arg)
145 {
146 struct lirc_codec *lirc;
147 struct rc_dev *dev;
148 u32 __user *argp = (u32 __user *)(arg);
149 int ret = 0;
150 __u32 val = 0, tmp;
151
152 lirc = lirc_get_pdata(filep);
153 if (!lirc)
154 return -EFAULT;
155
156 dev = lirc->dev;
157 if (!dev)
158 return -EFAULT;
159
160 if (_IOC_DIR(cmd) & _IOC_WRITE) {
161 ret = get_user(val, argp);
162 if (ret)
163 return ret;
164 }
165
166 switch (cmd) {
167
168 /* legacy support */
169 case LIRC_GET_SEND_MODE:
170 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
171 break;
172
173 case LIRC_SET_SEND_MODE:
174 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
175 return -EINVAL;
176 return 0;
177
178 /* TX settings */
179 case LIRC_SET_TRANSMITTER_MASK:
180 if (!dev->s_tx_mask)
181 return -EINVAL;
182
183 return dev->s_tx_mask(dev, val);
184
185 case LIRC_SET_SEND_CARRIER:
186 if (!dev->s_tx_carrier)
187 return -EINVAL;
188
189 return dev->s_tx_carrier(dev, val);
190
191 case LIRC_SET_SEND_DUTY_CYCLE:
192 if (!dev->s_tx_duty_cycle)
193 return -ENOSYS;
194
195 if (val <= 0 || val >= 100)
196 return -EINVAL;
197
198 return dev->s_tx_duty_cycle(dev, val);
199
200 /* RX settings */
201 case LIRC_SET_REC_CARRIER:
202 if (!dev->s_rx_carrier_range)
203 return -ENOSYS;
204
205 if (val <= 0)
206 return -EINVAL;
207
208 return dev->s_rx_carrier_range(dev,
209 dev->raw->lirc.carrier_low,
210 val);
211
212 case LIRC_SET_REC_CARRIER_RANGE:
213 if (val <= 0)
214 return -EINVAL;
215
216 dev->raw->lirc.carrier_low = val;
217 return 0;
218
219 case LIRC_GET_REC_RESOLUTION:
220 val = dev->rx_resolution;
221 break;
222
223 case LIRC_SET_WIDEBAND_RECEIVER:
224 if (!dev->s_learning_mode)
225 return -ENOSYS;
226
227 return dev->s_learning_mode(dev, !!val);
228
229 case LIRC_SET_MEASURE_CARRIER_MODE:
230 if (!dev->s_carrier_report)
231 return -ENOSYS;
232
233 return dev->s_carrier_report(dev, !!val);
234
235 /* Generic timeout support */
236 case LIRC_GET_MIN_TIMEOUT:
237 if (!dev->max_timeout)
238 return -ENOSYS;
239 val = dev->min_timeout / 1000;
240 break;
241
242 case LIRC_GET_MAX_TIMEOUT:
243 if (!dev->max_timeout)
244 return -ENOSYS;
245 val = dev->max_timeout / 1000;
246 break;
247
248 case LIRC_SET_REC_TIMEOUT:
249 if (!dev->max_timeout)
250 return -ENOSYS;
251
252 tmp = val * 1000;
253
254 if (tmp < dev->min_timeout ||
255 tmp > dev->max_timeout)
256 return -EINVAL;
257
258 dev->timeout = tmp;
259 break;
260
261 case LIRC_SET_REC_TIMEOUT_REPORTS:
262 lirc->send_timeout_reports = !!val;
263 break;
264
265 default:
266 return lirc_dev_fop_ioctl(filep, cmd, arg);
267 }
268
269 if (_IOC_DIR(cmd) & _IOC_READ)
270 ret = put_user(val, argp);
271
272 return ret;
273 }
274
ir_lirc_open(void * data)275 static int ir_lirc_open(void *data)
276 {
277 return 0;
278 }
279
ir_lirc_close(void * data)280 static void ir_lirc_close(void *data)
281 {
282 return;
283 }
284
285 static struct file_operations lirc_fops = {
286 .owner = THIS_MODULE,
287 .write = ir_lirc_transmit_ir,
288 .unlocked_ioctl = ir_lirc_ioctl,
289 #ifdef CONFIG_COMPAT
290 .compat_ioctl = ir_lirc_ioctl,
291 #endif
292 .read = lirc_dev_fop_read,
293 .poll = lirc_dev_fop_poll,
294 .open = lirc_dev_fop_open,
295 .release = lirc_dev_fop_close,
296 .llseek = no_llseek,
297 };
298
ir_lirc_register(struct rc_dev * dev)299 static int ir_lirc_register(struct rc_dev *dev)
300 {
301 struct lirc_driver *drv;
302 struct lirc_buffer *rbuf;
303 int rc = -ENOMEM;
304 unsigned long features;
305
306 drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
307 if (!drv)
308 return rc;
309
310 rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
311 if (!rbuf)
312 goto rbuf_alloc_failed;
313
314 rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
315 if (rc)
316 goto rbuf_init_failed;
317
318 features = LIRC_CAN_REC_MODE2;
319 if (dev->tx_ir) {
320 features |= LIRC_CAN_SEND_PULSE;
321 if (dev->s_tx_mask)
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;
327 }
328
329 if (dev->s_rx_carrier_range)
330 features |= LIRC_CAN_SET_REC_CARRIER |
331 LIRC_CAN_SET_REC_CARRIER_RANGE;
332
333 if (dev->s_learning_mode)
334 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
335
336 if (dev->s_carrier_report)
337 features |= LIRC_CAN_MEASURE_CARRIER;
338
339 if (dev->max_timeout)
340 features |= LIRC_CAN_SET_REC_TIMEOUT;
341
342 snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
343 dev->driver_name);
344 drv->minor = -1;
345 drv->features = features;
346 drv->data = &dev->raw->lirc;
347 drv->rbuf = rbuf;
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;
354
355 drv->minor = lirc_register_driver(drv);
356 if (drv->minor < 0) {
357 rc = -ENODEV;
358 goto lirc_register_failed;
359 }
360
361 dev->raw->lirc.drv = drv;
362 dev->raw->lirc.dev = dev;
363 return 0;
364
365 lirc_register_failed:
366 rbuf_init_failed:
367 kfree(rbuf);
368 rbuf_alloc_failed:
369 kfree(drv);
370
371 return rc;
372 }
373
ir_lirc_unregister(struct rc_dev * dev)374 static int ir_lirc_unregister(struct rc_dev *dev)
375 {
376 struct lirc_codec *lirc = &dev->raw->lirc;
377
378 lirc_unregister_driver(lirc->drv->minor);
379 lirc_buffer_free(lirc->drv->rbuf);
380 kfree(lirc->drv);
381
382 return 0;
383 }
384
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,
390 };
391
ir_lirc_codec_init(void)392 static int __init ir_lirc_codec_init(void)
393 {
394 ir_raw_handler_register(&lirc_handler);
395
396 printk(KERN_INFO "IR LIRC bridge handler initialized\n");
397 return 0;
398 }
399
ir_lirc_codec_exit(void)400 static void __exit ir_lirc_codec_exit(void)
401 {
402 ir_raw_handler_unregister(&lirc_handler);
403 }
404
405 module_init(ir_lirc_codec_init);
406 module_exit(ir_lirc_codec_exit);
407
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");
412