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> | |
17 | #include <media/lirc.h> | |
5690085e | 18 | #include <media/lirc_dev.h> |
6bda9644 | 19 | #include <media/rc-core.h> |
f62de675 | 20 | #include "rc-core-priv.h" |
ca414698 JW |
21 | |
22 | #define LIRCBUF_SIZE 256 | |
23 | ||
24 | /** | |
25 | * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the | |
26 | * lircd userspace daemon for decoding. | |
d8b4b582 | 27 | * @input_dev: the struct rc_dev descriptor of the device |
ca414698 JW |
28 | * @duration: the struct ir_raw_event descriptor of the pulse/space |
29 | * | |
30 | * This function returns -EINVAL if the lirc interfaces aren't wired up. | |
31 | */ | |
d8b4b582 | 32 | static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev) |
ca414698 | 33 | { |
d8b4b582 | 34 | struct lirc_codec *lirc = &dev->raw->lirc; |
510fcb70 | 35 | int sample; |
ca414698 | 36 | |
52b66144 | 37 | if (!(dev->raw->enabled_protocols & RC_TYPE_LIRC)) |
ca414698 JW |
38 | return 0; |
39 | ||
d8b4b582 | 40 | if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf) |
ca414698 JW |
41 | return -EINVAL; |
42 | ||
4651918a ML |
43 | /* Packet start */ |
44 | if (ev.reset) | |
510fcb70 ML |
45 | return 0; |
46 | ||
4651918a ML |
47 | /* Carrier reports */ |
48 | if (ev.carrier_report) { | |
49 | sample = LIRC_FREQUENCY(ev.carrier); | |
457e2ffc | 50 | IR_dprintk(2, "carrier report (freq: %d)\n", sample); |
ca414698 | 51 | |
4651918a ML |
52 | /* Packet end */ |
53 | } else if (ev.timeout) { | |
54 | ||
55 | if (lirc->gap) | |
56 | return 0; | |
57 | ||
58 | lirc->gap_start = ktime_get(); | |
59 | lirc->gap = true; | |
60 | lirc->gap_duration = ev.duration; | |
61 | ||
62 | if (!lirc->send_timeout_reports) | |
63 | return 0; | |
64 | ||
65 | sample = LIRC_TIMEOUT(ev.duration / 1000); | |
457e2ffc | 66 | IR_dprintk(2, "timeout report (duration: %d)\n", sample); |
4651918a ML |
67 | |
68 | /* Normal sample */ | |
69 | } else { | |
70 | ||
71 | if (lirc->gap) { | |
72 | int gap_sample; | |
73 | ||
74 | lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(), | |
75 | lirc->gap_start)); | |
76 | ||
77 | /* Convert to ms and cap by LIRC_VALUE_MASK */ | |
78 | do_div(lirc->gap_duration, 1000); | |
79 | lirc->gap_duration = min(lirc->gap_duration, | |
80 | (u64)LIRC_VALUE_MASK); | |
81 | ||
82 | gap_sample = LIRC_SPACE(lirc->gap_duration); | |
d8b4b582 | 83 | lirc_buffer_write(dev->raw->lirc.drv->rbuf, |
4651918a ML |
84 | (unsigned char *) &gap_sample); |
85 | lirc->gap = false; | |
86 | } | |
87 | ||
88 | sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) : | |
89 | LIRC_SPACE(ev.duration / 1000); | |
457e2ffc JW |
90 | IR_dprintk(2, "delivering %uus %s to lirc_dev\n", |
91 | TO_US(ev.duration), TO_STR(ev.pulse)); | |
4651918a | 92 | } |
ca414698 | 93 | |
d8b4b582 | 94 | lirc_buffer_write(dev->raw->lirc.drv->rbuf, |
510fcb70 | 95 | (unsigned char *) &sample); |
d8b4b582 | 96 | wake_up(&dev->raw->lirc.drv->rbuf->wait_poll); |
ca414698 | 97 | |
ca414698 JW |
98 | return 0; |
99 | } | |
100 | ||
101 | static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf, | |
102 | size_t n, loff_t *ppos) | |
103 | { | |
104 | struct lirc_codec *lirc; | |
d8b4b582 | 105 | struct rc_dev *dev; |
ca414698 | 106 | int *txbuf; /* buffer with values to transmit */ |
4c8b8698 VK |
107 | int ret = 0; |
108 | size_t count; | |
ca414698 JW |
109 | |
110 | lirc = lirc_get_pdata(file); | |
111 | if (!lirc) | |
112 | return -EFAULT; | |
113 | ||
114 | if (n % sizeof(int)) | |
115 | return -EINVAL; | |
116 | ||
117 | count = n / sizeof(int); | |
4c8b8698 | 118 | if (count > LIRCBUF_SIZE || count % 2 == 0 || n % sizeof(int) != 0) |
ca414698 JW |
119 | return -EINVAL; |
120 | ||
6efb870a JW |
121 | txbuf = memdup_user(buf, n); |
122 | if (IS_ERR(txbuf)) | |
123 | return PTR_ERR(txbuf); | |
ca414698 | 124 | |
d8b4b582 DH |
125 | dev = lirc->dev; |
126 | if (!dev) { | |
ca414698 JW |
127 | ret = -EFAULT; |
128 | goto out; | |
129 | } | |
130 | ||
d8b4b582 DH |
131 | if (dev->tx_ir) |
132 | ret = dev->tx_ir(dev, txbuf, (u32)n); | |
ca414698 JW |
133 | |
134 | out: | |
135 | kfree(txbuf); | |
136 | return ret; | |
137 | } | |
138 | ||
e589333f ML |
139 | static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, |
140 | unsigned long __user arg) | |
ca414698 JW |
141 | { |
142 | struct lirc_codec *lirc; | |
d8b4b582 | 143 | struct rc_dev *dev; |
ca414698 | 144 | int ret = 0; |
4651918a | 145 | __u32 val = 0, tmp; |
ca414698 JW |
146 | |
147 | lirc = lirc_get_pdata(filep); | |
148 | if (!lirc) | |
149 | return -EFAULT; | |
150 | ||
d8b4b582 DH |
151 | dev = lirc->dev; |
152 | if (!dev) | |
ca414698 JW |
153 | return -EFAULT; |
154 | ||
e589333f | 155 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
be1f985f | 156 | ret = get_user(val, (__u32 *)arg); |
ca414698 JW |
157 | if (ret) |
158 | return ret; | |
e589333f ML |
159 | } |
160 | ||
161 | switch (cmd) { | |
162 | ||
163 | /* legacy support */ | |
164 | case LIRC_GET_SEND_MODE: | |
165 | val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK; | |
166 | break; | |
167 | ||
168 | case LIRC_SET_SEND_MODE: | |
169 | if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK)) | |
170 | return -EINVAL; | |
4651918a | 171 | return 0; |
ca414698 | 172 | |
e589333f ML |
173 | /* TX settings */ |
174 | case LIRC_SET_TRANSMITTER_MASK: | |
d8b4b582 | 175 | if (!dev->s_tx_mask) |
ca414698 | 176 | return -EINVAL; |
4651918a | 177 | |
d8b4b582 | 178 | return dev->s_tx_mask(dev, val); |
ca414698 JW |
179 | |
180 | case LIRC_SET_SEND_CARRIER: | |
d8b4b582 | 181 | if (!dev->s_tx_carrier) |
ca414698 | 182 | return -EINVAL; |
4651918a | 183 | |
d8b4b582 | 184 | return dev->s_tx_carrier(dev, val); |
ca414698 | 185 | |
e589333f | 186 | case LIRC_SET_SEND_DUTY_CYCLE: |
d8b4b582 | 187 | if (!dev->s_tx_duty_cycle) |
e589333f ML |
188 | return -ENOSYS; |
189 | ||
190 | if (val <= 0 || val >= 100) | |
191 | return -EINVAL; | |
192 | ||
d8b4b582 | 193 | return dev->s_tx_duty_cycle(dev, val); |
ca414698 | 194 | |
e589333f ML |
195 | /* RX settings */ |
196 | case LIRC_SET_REC_CARRIER: | |
d8b4b582 | 197 | if (!dev->s_rx_carrier_range) |
e589333f | 198 | return -ENOSYS; |
ca414698 | 199 | |
4651918a ML |
200 | if (val <= 0) |
201 | return -EINVAL; | |
202 | ||
d8b4b582 DH |
203 | return dev->s_rx_carrier_range(dev, |
204 | dev->raw->lirc.carrier_low, | |
205 | val); | |
e589333f ML |
206 | |
207 | case LIRC_SET_REC_CARRIER_RANGE: | |
4651918a ML |
208 | if (val <= 0) |
209 | return -EINVAL; | |
e589333f | 210 | |
d8b4b582 | 211 | dev->raw->lirc.carrier_low = val; |
4651918a | 212 | return 0; |
e589333f ML |
213 | |
214 | case LIRC_GET_REC_RESOLUTION: | |
d8b4b582 | 215 | val = dev->rx_resolution; |
e589333f ML |
216 | break; |
217 | ||
218 | case LIRC_SET_WIDEBAND_RECEIVER: | |
d8b4b582 | 219 | if (!dev->s_learning_mode) |
e589333f ML |
220 | return -ENOSYS; |
221 | ||
d8b4b582 | 222 | return dev->s_learning_mode(dev, !!val); |
4651918a ML |
223 | |
224 | case LIRC_SET_MEASURE_CARRIER_MODE: | |
d8b4b582 | 225 | if (!dev->s_carrier_report) |
4651918a ML |
226 | return -ENOSYS; |
227 | ||
d8b4b582 | 228 | return dev->s_carrier_report(dev, !!val); |
4651918a | 229 | |
e589333f ML |
230 | /* Generic timeout support */ |
231 | case LIRC_GET_MIN_TIMEOUT: | |
d8b4b582 | 232 | if (!dev->max_timeout) |
e589333f | 233 | return -ENOSYS; |
d8b4b582 | 234 | val = dev->min_timeout / 1000; |
e589333f ML |
235 | break; |
236 | ||
237 | case LIRC_GET_MAX_TIMEOUT: | |
d8b4b582 | 238 | if (!dev->max_timeout) |
e589333f | 239 | return -ENOSYS; |
d8b4b582 | 240 | val = dev->max_timeout / 1000; |
e589333f ML |
241 | break; |
242 | ||
243 | case LIRC_SET_REC_TIMEOUT: | |
d8b4b582 | 244 | if (!dev->max_timeout) |
4651918a ML |
245 | return -ENOSYS; |
246 | ||
247 | tmp = val * 1000; | |
248 | ||
d8b4b582 DH |
249 | if (tmp < dev->min_timeout || |
250 | tmp > dev->max_timeout) | |
4651918a ML |
251 | return -EINVAL; |
252 | ||
d8b4b582 | 253 | dev->timeout = tmp; |
4651918a ML |
254 | break; |
255 | ||
256 | case LIRC_SET_REC_TIMEOUT_REPORTS: | |
257 | lirc->send_timeout_reports = !!val; | |
ca414698 JW |
258 | break; |
259 | ||
260 | default: | |
044e5878 | 261 | return lirc_dev_fop_ioctl(filep, cmd, arg); |
ca414698 JW |
262 | } |
263 | ||
e589333f | 264 | if (_IOC_DIR(cmd) & _IOC_READ) |
be1f985f | 265 | ret = put_user(val, (__u32 *)arg); |
e589333f | 266 | |
ca414698 JW |
267 | return ret; |
268 | } | |
269 | ||
270 | static int ir_lirc_open(void *data) | |
271 | { | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static void ir_lirc_close(void *data) | |
276 | { | |
277 | return; | |
278 | } | |
279 | ||
280 | static struct file_operations lirc_fops = { | |
281 | .owner = THIS_MODULE, | |
282 | .write = ir_lirc_transmit_ir, | |
044e5878 | 283 | .unlocked_ioctl = ir_lirc_ioctl, |
8be292cc JW |
284 | #ifdef CONFIG_COMPAT |
285 | .compat_ioctl = ir_lirc_ioctl, | |
286 | #endif | |
ca414698 JW |
287 | .read = lirc_dev_fop_read, |
288 | .poll = lirc_dev_fop_poll, | |
289 | .open = lirc_dev_fop_open, | |
290 | .release = lirc_dev_fop_close, | |
d9d2e9d5 | 291 | .llseek = no_llseek, |
ca414698 JW |
292 | }; |
293 | ||
d8b4b582 | 294 | static int ir_lirc_register(struct rc_dev *dev) |
ca414698 | 295 | { |
ca414698 JW |
296 | struct lirc_driver *drv; |
297 | struct lirc_buffer *rbuf; | |
298 | int rc = -ENOMEM; | |
299 | unsigned long features; | |
300 | ||
301 | drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL); | |
302 | if (!drv) | |
303 | return rc; | |
304 | ||
305 | rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
49b7a12c | 306 | if (!rbuf) |
ca414698 JW |
307 | goto rbuf_alloc_failed; |
308 | ||
309 | rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE); | |
310 | if (rc) | |
311 | goto rbuf_init_failed; | |
312 | ||
313 | features = LIRC_CAN_REC_MODE2; | |
d8b4b582 | 314 | if (dev->tx_ir) { |
ca414698 | 315 | features |= LIRC_CAN_SEND_PULSE; |
d8b4b582 | 316 | if (dev->s_tx_mask) |
ca414698 | 317 | features |= LIRC_CAN_SET_TRANSMITTER_MASK; |
d8b4b582 | 318 | if (dev->s_tx_carrier) |
ca414698 | 319 | features |= LIRC_CAN_SET_SEND_CARRIER; |
d8b4b582 | 320 | if (dev->s_tx_duty_cycle) |
67332ba8 | 321 | features |= LIRC_CAN_SET_SEND_DUTY_CYCLE; |
ca414698 JW |
322 | } |
323 | ||
d8b4b582 | 324 | if (dev->s_rx_carrier_range) |
e589333f ML |
325 | features |= LIRC_CAN_SET_REC_CARRIER | |
326 | LIRC_CAN_SET_REC_CARRIER_RANGE; | |
327 | ||
d8b4b582 | 328 | if (dev->s_learning_mode) |
e589333f ML |
329 | features |= LIRC_CAN_USE_WIDEBAND_RECEIVER; |
330 | ||
d8b4b582 | 331 | if (dev->s_carrier_report) |
4651918a ML |
332 | features |= LIRC_CAN_MEASURE_CARRIER; |
333 | ||
d8b4b582 | 334 | if (dev->max_timeout) |
e589333f ML |
335 | features |= LIRC_CAN_SET_REC_TIMEOUT; |
336 | ||
ca414698 | 337 | snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)", |
d8b4b582 | 338 | dev->driver_name); |
ca414698 JW |
339 | drv->minor = -1; |
340 | drv->features = features; | |
d8b4b582 | 341 | drv->data = &dev->raw->lirc; |
ca414698 JW |
342 | drv->rbuf = rbuf; |
343 | drv->set_use_inc = &ir_lirc_open; | |
344 | drv->set_use_dec = &ir_lirc_close; | |
345 | drv->code_length = sizeof(struct ir_raw_event) * 8; | |
346 | drv->fops = &lirc_fops; | |
d8b4b582 | 347 | drv->dev = &dev->dev; |
ca414698 JW |
348 | drv->owner = THIS_MODULE; |
349 | ||
350 | drv->minor = lirc_register_driver(drv); | |
351 | if (drv->minor < 0) { | |
352 | rc = -ENODEV; | |
353 | goto lirc_register_failed; | |
354 | } | |
355 | ||
d8b4b582 DH |
356 | dev->raw->lirc.drv = drv; |
357 | dev->raw->lirc.dev = dev; | |
ca414698 JW |
358 | return 0; |
359 | ||
360 | lirc_register_failed: | |
361 | rbuf_init_failed: | |
362 | kfree(rbuf); | |
363 | rbuf_alloc_failed: | |
364 | kfree(drv); | |
365 | ||
366 | return rc; | |
367 | } | |
368 | ||
d8b4b582 | 369 | static int ir_lirc_unregister(struct rc_dev *dev) |
ca414698 | 370 | { |
d8b4b582 | 371 | struct lirc_codec *lirc = &dev->raw->lirc; |
ca414698 JW |
372 | |
373 | lirc_unregister_driver(lirc->drv->minor); | |
374 | lirc_buffer_free(lirc->drv->rbuf); | |
375 | kfree(lirc->drv); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static struct ir_raw_handler lirc_handler = { | |
52b66144 | 381 | .protocols = RC_TYPE_LIRC, |
ca414698 JW |
382 | .decode = ir_lirc_decode, |
383 | .raw_register = ir_lirc_register, | |
384 | .raw_unregister = ir_lirc_unregister, | |
385 | }; | |
386 | ||
387 | static int __init ir_lirc_codec_init(void) | |
388 | { | |
389 | ir_raw_handler_register(&lirc_handler); | |
390 | ||
391 | printk(KERN_INFO "IR LIRC bridge handler initialized\n"); | |
392 | return 0; | |
393 | } | |
394 | ||
395 | static void __exit ir_lirc_codec_exit(void) | |
396 | { | |
397 | ir_raw_handler_unregister(&lirc_handler); | |
398 | } | |
399 | ||
400 | module_init(ir_lirc_codec_init); | |
401 | module_exit(ir_lirc_codec_exit); | |
402 | ||
403 | MODULE_LICENSE("GPL"); | |
404 | MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>"); | |
405 | MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); | |
406 | MODULE_DESCRIPTION("LIRC IR handler bridge"); |