[media] rc-core: lirc use unsigned int
[linux-2.6.git] / drivers / media / rc / ir-lirc-codec.c
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 <media/lirc.h>
18 #include <media/lirc_dev.h>
19 #include <media/rc-core.h>
20 #include "rc-core-priv.h"
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.
27  * @input_dev:  the struct rc_dev descriptor of the device
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  */
32 static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
33 {
34         struct lirc_codec *lirc = &dev->raw->lirc;
35         int sample;
36
37         if (!(dev->raw->enabled_protocols & RC_TYPE_LIRC))
38                 return 0;
39
40         if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
41                 return -EINVAL;
42
43         /* Packet start */
44         if (ev.reset)
45                 return 0;
46
47         /* Carrier reports */
48         if (ev.carrier_report) {
49                 sample = LIRC_FREQUENCY(ev.carrier);
50                 IR_dprintk(2, "carrier report (freq: %d)\n", sample);
51
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);
66                 IR_dprintk(2, "timeout report (duration: %d)\n", sample);
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);
83                         lirc_buffer_write(dev->raw->lirc.drv->rbuf,
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);
90                 IR_dprintk(2, "delivering %uus %s to lirc_dev\n",
91                            TO_US(ev.duration), TO_STR(ev.pulse));
92         }
93
94         lirc_buffer_write(dev->raw->lirc.drv->rbuf,
95                           (unsigned char *) &sample);
96         wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);
97
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;
105         struct rc_dev *dev;
106         unsigned int *txbuf; /* buffer with values to transmit */
107         ssize_t ret = 0;
108         size_t count;
109
110         lirc = lirc_get_pdata(file);
111         if (!lirc)
112                 return -EFAULT;
113
114         if (n < sizeof(unsigned) || n % sizeof(unsigned))
115                 return -EINVAL;
116
117         count = n / sizeof(unsigned);
118         if (count > LIRCBUF_SIZE || count % 2 == 0)
119                 return -EINVAL;
120
121         txbuf = memdup_user(buf, n);
122         if (IS_ERR(txbuf))
123                 return PTR_ERR(txbuf);
124
125         dev = lirc->dev;
126         if (!dev) {
127                 ret = -EFAULT;
128                 goto out;
129         }
130
131         if (dev->tx_ir)
132                 ret = dev->tx_ir(dev, txbuf, count);
133
134         if (ret > 0)
135                 ret *= sizeof(unsigned);
136
137 out:
138         kfree(txbuf);
139         return ret;
140 }
141
142 static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
143                         unsigned long __user arg)
144 {
145         struct lirc_codec *lirc;
146         struct rc_dev *dev;
147         int ret = 0;
148         __u32 val = 0, tmp;
149
150         lirc = lirc_get_pdata(filep);
151         if (!lirc)
152                 return -EFAULT;
153
154         dev = lirc->dev;
155         if (!dev)
156                 return -EFAULT;
157
158         if (_IOC_DIR(cmd) & _IOC_WRITE) {
159                 ret = get_user(val, (__u32 *)arg);
160                 if (ret)
161                         return ret;
162         }
163
164         switch (cmd) {
165
166         /* legacy support */
167         case LIRC_GET_SEND_MODE:
168                 val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
169                 break;
170
171         case LIRC_SET_SEND_MODE:
172                 if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
173                         return -EINVAL;
174                 return 0;
175
176         /* TX settings */
177         case LIRC_SET_TRANSMITTER_MASK:
178                 if (!dev->s_tx_mask)
179                         return -EINVAL;
180
181                 return dev->s_tx_mask(dev, val);
182
183         case LIRC_SET_SEND_CARRIER:
184                 if (!dev->s_tx_carrier)
185                         return -EINVAL;
186
187                 return dev->s_tx_carrier(dev, val);
188
189         case LIRC_SET_SEND_DUTY_CYCLE:
190                 if (!dev->s_tx_duty_cycle)
191                         return -ENOSYS;
192
193                 if (val <= 0 || val >= 100)
194                         return -EINVAL;
195
196                 return dev->s_tx_duty_cycle(dev, val);
197
198         /* RX settings */
199         case LIRC_SET_REC_CARRIER:
200                 if (!dev->s_rx_carrier_range)
201                         return -ENOSYS;
202
203                 if (val <= 0)
204                         return -EINVAL;
205
206                 return dev->s_rx_carrier_range(dev,
207                                                dev->raw->lirc.carrier_low,
208                                                val);
209
210         case LIRC_SET_REC_CARRIER_RANGE:
211                 if (val <= 0)
212                         return -EINVAL;
213
214                 dev->raw->lirc.carrier_low = val;
215                 return 0;
216
217         case LIRC_GET_REC_RESOLUTION:
218                 val = dev->rx_resolution;
219                 break;
220
221         case LIRC_SET_WIDEBAND_RECEIVER:
222                 if (!dev->s_learning_mode)
223                         return -ENOSYS;
224
225                 return dev->s_learning_mode(dev, !!val);
226
227         case LIRC_SET_MEASURE_CARRIER_MODE:
228                 if (!dev->s_carrier_report)
229                         return -ENOSYS;
230
231                 return dev->s_carrier_report(dev, !!val);
232
233         /* Generic timeout support */
234         case LIRC_GET_MIN_TIMEOUT:
235                 if (!dev->max_timeout)
236                         return -ENOSYS;
237                 val = dev->min_timeout / 1000;
238                 break;
239
240         case LIRC_GET_MAX_TIMEOUT:
241                 if (!dev->max_timeout)
242                         return -ENOSYS;
243                 val = dev->max_timeout / 1000;
244                 break;
245
246         case LIRC_SET_REC_TIMEOUT:
247                 if (!dev->max_timeout)
248                         return -ENOSYS;
249
250                 tmp = val * 1000;
251
252                 if (tmp < dev->min_timeout ||
253                     tmp > dev->max_timeout)
254                                 return -EINVAL;
255
256                 dev->timeout = tmp;
257                 break;
258
259         case LIRC_SET_REC_TIMEOUT_REPORTS:
260                 lirc->send_timeout_reports = !!val;
261                 break;
262
263         default:
264                 return lirc_dev_fop_ioctl(filep, cmd, arg);
265         }
266
267         if (_IOC_DIR(cmd) & _IOC_READ)
268                 ret = put_user(val, (__u32 *)arg);
269
270         return ret;
271 }
272
273 static int ir_lirc_open(void *data)
274 {
275         return 0;
276 }
277
278 static void ir_lirc_close(void *data)
279 {
280         return;
281 }
282
283 static struct file_operations lirc_fops = {
284         .owner          = THIS_MODULE,
285         .write          = ir_lirc_transmit_ir,
286         .unlocked_ioctl = ir_lirc_ioctl,
287 #ifdef CONFIG_COMPAT
288         .compat_ioctl   = ir_lirc_ioctl,
289 #endif
290         .read           = lirc_dev_fop_read,
291         .poll           = lirc_dev_fop_poll,
292         .open           = lirc_dev_fop_open,
293         .release        = lirc_dev_fop_close,
294         .llseek         = no_llseek,
295 };
296
297 static int ir_lirc_register(struct rc_dev *dev)
298 {
299         struct lirc_driver *drv;
300         struct lirc_buffer *rbuf;
301         int rc = -ENOMEM;
302         unsigned long features;
303
304         drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
305         if (!drv)
306                 return rc;
307
308         rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
309         if (!rbuf)
310                 goto rbuf_alloc_failed;
311
312         rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
313         if (rc)
314                 goto rbuf_init_failed;
315
316         features = LIRC_CAN_REC_MODE2;
317         if (dev->tx_ir) {
318                 features |= LIRC_CAN_SEND_PULSE;
319                 if (dev->s_tx_mask)
320                         features |= LIRC_CAN_SET_TRANSMITTER_MASK;
321                 if (dev->s_tx_carrier)
322                         features |= LIRC_CAN_SET_SEND_CARRIER;
323                 if (dev->s_tx_duty_cycle)
324                         features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
325         }
326
327         if (dev->s_rx_carrier_range)
328                 features |= LIRC_CAN_SET_REC_CARRIER |
329                         LIRC_CAN_SET_REC_CARRIER_RANGE;
330
331         if (dev->s_learning_mode)
332                 features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
333
334         if (dev->s_carrier_report)
335                 features |= LIRC_CAN_MEASURE_CARRIER;
336
337         if (dev->max_timeout)
338                 features |= LIRC_CAN_SET_REC_TIMEOUT;
339
340         snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
341                  dev->driver_name);
342         drv->minor = -1;
343         drv->features = features;
344         drv->data = &dev->raw->lirc;
345         drv->rbuf = rbuf;
346         drv->set_use_inc = &ir_lirc_open;
347         drv->set_use_dec = &ir_lirc_close;
348         drv->code_length = sizeof(struct ir_raw_event) * 8;
349         drv->fops = &lirc_fops;
350         drv->dev = &dev->dev;
351         drv->owner = THIS_MODULE;
352
353         drv->minor = lirc_register_driver(drv);
354         if (drv->minor < 0) {
355                 rc = -ENODEV;
356                 goto lirc_register_failed;
357         }
358
359         dev->raw->lirc.drv = drv;
360         dev->raw->lirc.dev = dev;
361         return 0;
362
363 lirc_register_failed:
364 rbuf_init_failed:
365         kfree(rbuf);
366 rbuf_alloc_failed:
367         kfree(drv);
368
369         return rc;
370 }
371
372 static int ir_lirc_unregister(struct rc_dev *dev)
373 {
374         struct lirc_codec *lirc = &dev->raw->lirc;
375
376         lirc_unregister_driver(lirc->drv->minor);
377         lirc_buffer_free(lirc->drv->rbuf);
378         kfree(lirc->drv);
379
380         return 0;
381 }
382
383 static struct ir_raw_handler lirc_handler = {
384         .protocols      = RC_TYPE_LIRC,
385         .decode         = ir_lirc_decode,
386         .raw_register   = ir_lirc_register,
387         .raw_unregister = ir_lirc_unregister,
388 };
389
390 static int __init ir_lirc_codec_init(void)
391 {
392         ir_raw_handler_register(&lirc_handler);
393
394         printk(KERN_INFO "IR LIRC bridge handler initialized\n");
395         return 0;
396 }
397
398 static void __exit ir_lirc_codec_exit(void)
399 {
400         ir_raw_handler_unregister(&lirc_handler);
401 }
402
403 module_init(ir_lirc_codec_init);
404 module_exit(ir_lirc_codec_exit);
405
406 MODULE_LICENSE("GPL");
407 MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
408 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
409 MODULE_DESCRIPTION("LIRC IR handler bridge");