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Merge tag 'freevxfs-for-4.8' of git://git.infradead.org/users/hch/freevxfs
[deliverable/linux.git] / drivers / media / radio / si470x / radio-si470x-common.c
1 /*
2 * drivers/media/radio/si470x/radio-si470x-common.c
3 *
4 * Driver for radios with Silicon Labs Si470x FM Radio Receivers
5 *
6 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
7 * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24
25 /*
26 * History:
27 * 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net>
28 * Version 1.0.0
29 * - First working version
30 * 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net>
31 * Version 1.0.1
32 * - Improved error handling, every function now returns errno
33 * - Improved multi user access (start/mute/stop)
34 * - Channel doesn't get lost anymore after start/mute/stop
35 * - RDS support added (polling mode via interrupt EP 1)
36 * - marked default module parameters with *value*
37 * - switched from bit structs to bit masks
38 * - header file cleaned and integrated
39 * 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net>
40 * Version 1.0.2
41 * - hex values are now lower case
42 * - commented USB ID for ADS/Tech moved on todo list
43 * - blacklisted si470x in hid-quirks.c
44 * - rds buffer handling functions integrated into *_work, *_read
45 * - rds_command in si470x_poll exchanged against simple retval
46 * - check for firmware version 15
47 * - code order and prototypes still remain the same
48 * - spacing and bottom of band codes remain the same
49 * 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net>
50 * Version 1.0.3
51 * - code reordered to avoid function prototypes
52 * - switch/case defaults are now more user-friendly
53 * - unified comment style
54 * - applied all checkpatch.pl v1.12 suggestions
55 * except the warning about the too long lines with bit comments
56 * - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
57 * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net>
58 * Version 1.0.4
59 * - avoid poss. locking when doing copy_to_user which may sleep
60 * - RDS is automatically activated on read now
61 * - code cleaned of unnecessary rds_commands
62 * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
63 * (thanks to Guillaume RAMOUSSE)
64 * 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net>
65 * Version 1.0.5
66 * - number of seek_retries changed to tune_timeout
67 * - fixed problem with incomplete tune operations by own buffers
68 * - optimization of variables and printf types
69 * - improved error logging
70 * 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net>
71 * Oliver Neukum <oliver@neukum.org>
72 * Version 1.0.6
73 * - fixed coverity checker warnings in *_usb_driver_disconnect
74 * - probe()/open() race by correct ordering in probe()
75 * - DMA coherency rules by separate allocation of all buffers
76 * - use of endianness macros
77 * - abuse of spinlock, replaced by mutex
78 * - racy handling of timer in disconnect,
79 * replaced by delayed_work
80 * - racy interruptible_sleep_on(),
81 * replaced with wait_event_interruptible()
82 * - handle signals in read()
83 * 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net>
84 * Oliver Neukum <oliver@neukum.org>
85 * Version 1.0.7
86 * - usb autosuspend support
87 * - unplugging fixed
88 * 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net>
89 * Version 1.0.8
90 * - hardware frequency seek support
91 * - afc indication
92 * - more safety checks, let si470x_get_freq return errno
93 * - vidioc behavior corrected according to v4l2 spec
94 * 2008-10-20 Alexey Klimov <klimov.linux@gmail.com>
95 * - add support for KWorld USB FM Radio FM700
96 * - blacklisted KWorld radio in hid-core.c and hid-ids.h
97 * 2008-12-03 Mark Lord <mlord@pobox.com>
98 * - add support for DealExtreme USB Radio
99 * 2009-01-31 Bob Ross <pigiron@gmx.com>
100 * - correction of stereo detection/setting
101 * - correction of signal strength indicator scaling
102 * 2009-01-31 Rick Bronson <rick@efn.org>
103 * Tobias Lorenz <tobias.lorenz@gmx.net>
104 * - add LED status output
105 * - get HW/SW version from scratchpad
106 * 2009-06-16 Edouard Lafargue <edouard@lafargue.name>
107 * Version 1.0.10
108 * - add support for interrupt mode for RDS endpoint,
109 * instead of polling.
110 * Improves RDS reception significantly
111 */
112
113
114 /* kernel includes */
115 #include "radio-si470x.h"
116
117
118
119 /**************************************************************************
120 * Module Parameters
121 **************************************************************************/
122
123 /* Spacing (kHz) */
124 /* 0: 200 kHz (USA, Australia) */
125 /* 1: 100 kHz (Europe, Japan) */
126 /* 2: 50 kHz */
127 static unsigned short space = 2;
128 module_param(space, ushort, 0444);
129 MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
130
131 /* De-emphasis */
132 /* 0: 75 us (USA) */
133 /* 1: 50 us (Europe, Australia, Japan) */
134 static unsigned short de = 1;
135 module_param(de, ushort, 0444);
136 MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
137
138 /* Tune timeout */
139 static unsigned int tune_timeout = 3000;
140 module_param(tune_timeout, uint, 0644);
141 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
142
143 /* Seek timeout */
144 static unsigned int seek_timeout = 5000;
145 module_param(seek_timeout, uint, 0644);
146 MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
147
148 static const struct v4l2_frequency_band bands[] = {
149 {
150 .type = V4L2_TUNER_RADIO,
151 .index = 0,
152 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
153 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
154 V4L2_TUNER_CAP_FREQ_BANDS |
155 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
156 V4L2_TUNER_CAP_HWSEEK_WRAP,
157 .rangelow = 87500 * 16,
158 .rangehigh = 108000 * 16,
159 .modulation = V4L2_BAND_MODULATION_FM,
160 },
161 {
162 .type = V4L2_TUNER_RADIO,
163 .index = 1,
164 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
165 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
166 V4L2_TUNER_CAP_FREQ_BANDS |
167 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
168 V4L2_TUNER_CAP_HWSEEK_WRAP,
169 .rangelow = 76000 * 16,
170 .rangehigh = 108000 * 16,
171 .modulation = V4L2_BAND_MODULATION_FM,
172 },
173 {
174 .type = V4L2_TUNER_RADIO,
175 .index = 2,
176 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
177 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
178 V4L2_TUNER_CAP_FREQ_BANDS |
179 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
180 V4L2_TUNER_CAP_HWSEEK_WRAP,
181 .rangelow = 76000 * 16,
182 .rangehigh = 90000 * 16,
183 .modulation = V4L2_BAND_MODULATION_FM,
184 },
185 };
186
187 /**************************************************************************
188 * Generic Functions
189 **************************************************************************/
190
191 /*
192 * si470x_set_band - set the band
193 */
194 static int si470x_set_band(struct si470x_device *radio, int band)
195 {
196 if (radio->band == band)
197 return 0;
198
199 radio->band = band;
200 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND;
201 radio->registers[SYSCONFIG2] |= radio->band << 6;
202 return si470x_set_register(radio, SYSCONFIG2);
203 }
204
205 /*
206 * si470x_set_chan - set the channel
207 */
208 static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
209 {
210 int retval;
211 unsigned long time_left;
212 bool timed_out = false;
213
214 /* start tuning */
215 radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
216 radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
217 retval = si470x_set_register(radio, CHANNEL);
218 if (retval < 0)
219 goto done;
220
221 /* wait till tune operation has completed */
222 reinit_completion(&radio->completion);
223 time_left = wait_for_completion_timeout(&radio->completion,
224 msecs_to_jiffies(tune_timeout));
225 if (time_left == 0)
226 timed_out = true;
227
228 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
229 dev_warn(&radio->videodev.dev, "tune does not complete\n");
230 if (timed_out)
231 dev_warn(&radio->videodev.dev,
232 "tune timed out after %u ms\n", tune_timeout);
233
234 /* stop tuning */
235 radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
236 retval = si470x_set_register(radio, CHANNEL);
237
238 done:
239 return retval;
240 }
241
242 /*
243 * si470x_get_step - get channel spacing
244 */
245 static unsigned int si470x_get_step(struct si470x_device *radio)
246 {
247 /* Spacing (kHz) */
248 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
249 /* 0: 200 kHz (USA, Australia) */
250 case 0:
251 return 200 * 16;
252 /* 1: 100 kHz (Europe, Japan) */
253 case 1:
254 return 100 * 16;
255 /* 2: 50 kHz */
256 default:
257 return 50 * 16;
258 }
259 }
260
261
262 /*
263 * si470x_get_freq - get the frequency
264 */
265 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
266 {
267 int chan, retval;
268
269 /* read channel */
270 retval = si470x_get_register(radio, READCHAN);
271 chan = radio->registers[READCHAN] & READCHAN_READCHAN;
272
273 /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
274 *freq = chan * si470x_get_step(radio) + bands[radio->band].rangelow;
275
276 return retval;
277 }
278
279
280 /*
281 * si470x_set_freq - set the frequency
282 */
283 int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
284 {
285 unsigned short chan;
286
287 freq = clamp(freq, bands[radio->band].rangelow,
288 bands[radio->band].rangehigh);
289 /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
290 chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio);
291
292 return si470x_set_chan(radio, chan);
293 }
294
295
296 /*
297 * si470x_set_seek - set seek
298 */
299 static int si470x_set_seek(struct si470x_device *radio,
300 const struct v4l2_hw_freq_seek *seek)
301 {
302 int band, retval;
303 unsigned int freq;
304 bool timed_out = false;
305 unsigned long time_left;
306
307 /* set band */
308 if (seek->rangelow || seek->rangehigh) {
309 for (band = 0; band < ARRAY_SIZE(bands); band++) {
310 if (bands[band].rangelow == seek->rangelow &&
311 bands[band].rangehigh == seek->rangehigh)
312 break;
313 }
314 if (band == ARRAY_SIZE(bands))
315 return -EINVAL; /* No matching band found */
316 } else
317 band = 1; /* If nothing is specified seek 76 - 108 Mhz */
318
319 if (radio->band != band) {
320 retval = si470x_get_freq(radio, &freq);
321 if (retval)
322 return retval;
323 retval = si470x_set_band(radio, band);
324 if (retval)
325 return retval;
326 retval = si470x_set_freq(radio, freq);
327 if (retval)
328 return retval;
329 }
330
331 /* start seeking */
332 radio->registers[POWERCFG] |= POWERCFG_SEEK;
333 if (seek->wrap_around)
334 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
335 else
336 radio->registers[POWERCFG] |= POWERCFG_SKMODE;
337 if (seek->seek_upward)
338 radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
339 else
340 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
341 retval = si470x_set_register(radio, POWERCFG);
342 if (retval < 0)
343 return retval;
344
345 /* wait till tune operation has completed */
346 reinit_completion(&radio->completion);
347 time_left = wait_for_completion_timeout(&radio->completion,
348 msecs_to_jiffies(seek_timeout));
349 if (time_left == 0)
350 timed_out = true;
351
352 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
353 dev_warn(&radio->videodev.dev, "seek does not complete\n");
354 if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
355 dev_warn(&radio->videodev.dev,
356 "seek failed / band limit reached\n");
357
358 /* stop seeking */
359 radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
360 retval = si470x_set_register(radio, POWERCFG);
361
362 /* try again, if timed out */
363 if (retval == 0 && timed_out)
364 return -ENODATA;
365 return retval;
366 }
367
368
369 /*
370 * si470x_start - switch on radio
371 */
372 int si470x_start(struct si470x_device *radio)
373 {
374 int retval;
375
376 /* powercfg */
377 radio->registers[POWERCFG] =
378 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
379 retval = si470x_set_register(radio, POWERCFG);
380 if (retval < 0)
381 goto done;
382
383 /* sysconfig 1 */
384 radio->registers[SYSCONFIG1] =
385 (de << 11) & SYSCONFIG1_DE; /* DE*/
386 retval = si470x_set_register(radio, SYSCONFIG1);
387 if (retval < 0)
388 goto done;
389
390 /* sysconfig 2 */
391 radio->registers[SYSCONFIG2] =
392 (0x1f << 8) | /* SEEKTH */
393 ((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */
394 ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
395 15; /* VOLUME (max) */
396 retval = si470x_set_register(radio, SYSCONFIG2);
397 if (retval < 0)
398 goto done;
399
400 /* reset last channel */
401 retval = si470x_set_chan(radio,
402 radio->registers[CHANNEL] & CHANNEL_CHAN);
403
404 done:
405 return retval;
406 }
407
408
409 /*
410 * si470x_stop - switch off radio
411 */
412 int si470x_stop(struct si470x_device *radio)
413 {
414 int retval;
415
416 /* sysconfig 1 */
417 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
418 retval = si470x_set_register(radio, SYSCONFIG1);
419 if (retval < 0)
420 goto done;
421
422 /* powercfg */
423 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
424 /* POWERCFG_ENABLE has to automatically go low */
425 radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
426 retval = si470x_set_register(radio, POWERCFG);
427
428 done:
429 return retval;
430 }
431
432
433 /*
434 * si470x_rds_on - switch on rds reception
435 */
436 static int si470x_rds_on(struct si470x_device *radio)
437 {
438 int retval;
439
440 /* sysconfig 1 */
441 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
442 retval = si470x_set_register(radio, SYSCONFIG1);
443 if (retval < 0)
444 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
445
446 return retval;
447 }
448
449
450
451 /**************************************************************************
452 * File Operations Interface
453 **************************************************************************/
454
455 /*
456 * si470x_fops_read - read RDS data
457 */
458 static ssize_t si470x_fops_read(struct file *file, char __user *buf,
459 size_t count, loff_t *ppos)
460 {
461 struct si470x_device *radio = video_drvdata(file);
462 int retval = 0;
463 unsigned int block_count = 0;
464
465 /* switch on rds reception */
466 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
467 si470x_rds_on(radio);
468
469 /* block if no new data available */
470 while (radio->wr_index == radio->rd_index) {
471 if (file->f_flags & O_NONBLOCK) {
472 retval = -EWOULDBLOCK;
473 goto done;
474 }
475 if (wait_event_interruptible(radio->read_queue,
476 radio->wr_index != radio->rd_index) < 0) {
477 retval = -EINTR;
478 goto done;
479 }
480 }
481
482 /* calculate block count from byte count */
483 count /= 3;
484
485 /* copy RDS block out of internal buffer and to user buffer */
486 while (block_count < count) {
487 if (radio->rd_index == radio->wr_index)
488 break;
489
490 /* always transfer rds complete blocks */
491 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
492 /* retval = -EFAULT; */
493 break;
494
495 /* increment and wrap read pointer */
496 radio->rd_index += 3;
497 if (radio->rd_index >= radio->buf_size)
498 radio->rd_index = 0;
499
500 /* increment counters */
501 block_count++;
502 buf += 3;
503 retval += 3;
504 }
505
506 done:
507 return retval;
508 }
509
510
511 /*
512 * si470x_fops_poll - poll RDS data
513 */
514 static unsigned int si470x_fops_poll(struct file *file,
515 struct poll_table_struct *pts)
516 {
517 struct si470x_device *radio = video_drvdata(file);
518 unsigned long req_events = poll_requested_events(pts);
519 int retval = v4l2_ctrl_poll(file, pts);
520
521 if (req_events & (POLLIN | POLLRDNORM)) {
522 /* switch on rds reception */
523 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
524 si470x_rds_on(radio);
525
526 poll_wait(file, &radio->read_queue, pts);
527
528 if (radio->rd_index != radio->wr_index)
529 retval |= POLLIN | POLLRDNORM;
530 }
531
532 return retval;
533 }
534
535
536 /*
537 * si470x_fops - file operations interface
538 */
539 static const struct v4l2_file_operations si470x_fops = {
540 .owner = THIS_MODULE,
541 .read = si470x_fops_read,
542 .poll = si470x_fops_poll,
543 .unlocked_ioctl = video_ioctl2,
544 .open = si470x_fops_open,
545 .release = si470x_fops_release,
546 };
547
548
549
550 /**************************************************************************
551 * Video4Linux Interface
552 **************************************************************************/
553
554
555 static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
556 {
557 struct si470x_device *radio =
558 container_of(ctrl->handler, struct si470x_device, hdl);
559
560 switch (ctrl->id) {
561 case V4L2_CID_AUDIO_VOLUME:
562 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
563 radio->registers[SYSCONFIG2] |= ctrl->val;
564 return si470x_set_register(radio, SYSCONFIG2);
565 case V4L2_CID_AUDIO_MUTE:
566 if (ctrl->val)
567 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
568 else
569 radio->registers[POWERCFG] |= POWERCFG_DMUTE;
570 return si470x_set_register(radio, POWERCFG);
571 default:
572 return -EINVAL;
573 }
574 }
575
576
577 /*
578 * si470x_vidioc_g_tuner - get tuner attributes
579 */
580 static int si470x_vidioc_g_tuner(struct file *file, void *priv,
581 struct v4l2_tuner *tuner)
582 {
583 struct si470x_device *radio = video_drvdata(file);
584 int retval = 0;
585
586 if (tuner->index != 0)
587 return -EINVAL;
588
589 if (!radio->status_rssi_auto_update) {
590 retval = si470x_get_register(radio, STATUSRSSI);
591 if (retval < 0)
592 return retval;
593 }
594
595 /* driver constants */
596 strcpy(tuner->name, "FM");
597 tuner->type = V4L2_TUNER_RADIO;
598 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
599 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
600 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
601 V4L2_TUNER_CAP_HWSEEK_WRAP;
602 tuner->rangelow = 76 * FREQ_MUL;
603 tuner->rangehigh = 108 * FREQ_MUL;
604
605 /* stereo indicator == stereo (instead of mono) */
606 if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
607 tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
608 else
609 tuner->rxsubchans = V4L2_TUNER_SUB_STEREO;
610 /* If there is a reliable method of detecting an RDS channel,
611 then this code should check for that before setting this
612 RDS subchannel. */
613 tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
614
615 /* mono/stereo selector */
616 if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
617 tuner->audmode = V4L2_TUNER_MODE_STEREO;
618 else
619 tuner->audmode = V4L2_TUNER_MODE_MONO;
620
621 /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
622 /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */
623 tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
624 /* the ideal factor is 0xffff/75 = 873,8 */
625 tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
626 if (tuner->signal > 0xffff)
627 tuner->signal = 0xffff;
628
629 /* automatic frequency control: -1: freq to low, 1 freq to high */
630 /* AFCRL does only indicate that freq. differs, not if too low/high */
631 tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
632
633 return retval;
634 }
635
636
637 /*
638 * si470x_vidioc_s_tuner - set tuner attributes
639 */
640 static int si470x_vidioc_s_tuner(struct file *file, void *priv,
641 const struct v4l2_tuner *tuner)
642 {
643 struct si470x_device *radio = video_drvdata(file);
644
645 if (tuner->index != 0)
646 return -EINVAL;
647
648 /* mono/stereo selector */
649 switch (tuner->audmode) {
650 case V4L2_TUNER_MODE_MONO:
651 radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */
652 break;
653 case V4L2_TUNER_MODE_STEREO:
654 default:
655 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
656 break;
657 }
658
659 return si470x_set_register(radio, POWERCFG);
660 }
661
662
663 /*
664 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
665 */
666 static int si470x_vidioc_g_frequency(struct file *file, void *priv,
667 struct v4l2_frequency *freq)
668 {
669 struct si470x_device *radio = video_drvdata(file);
670
671 if (freq->tuner != 0)
672 return -EINVAL;
673
674 freq->type = V4L2_TUNER_RADIO;
675 return si470x_get_freq(radio, &freq->frequency);
676 }
677
678
679 /*
680 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
681 */
682 static int si470x_vidioc_s_frequency(struct file *file, void *priv,
683 const struct v4l2_frequency *freq)
684 {
685 struct si470x_device *radio = video_drvdata(file);
686 int retval;
687
688 if (freq->tuner != 0)
689 return -EINVAL;
690
691 if (freq->frequency < bands[radio->band].rangelow ||
692 freq->frequency > bands[radio->band].rangehigh) {
693 /* Switch to band 1 which covers everything we support */
694 retval = si470x_set_band(radio, 1);
695 if (retval)
696 return retval;
697 }
698 return si470x_set_freq(radio, freq->frequency);
699 }
700
701
702 /*
703 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
704 */
705 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
706 const struct v4l2_hw_freq_seek *seek)
707 {
708 struct si470x_device *radio = video_drvdata(file);
709
710 if (seek->tuner != 0)
711 return -EINVAL;
712
713 if (file->f_flags & O_NONBLOCK)
714 return -EWOULDBLOCK;
715
716 return si470x_set_seek(radio, seek);
717 }
718
719 /*
720 * si470x_vidioc_enum_freq_bands - enumerate supported bands
721 */
722 static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv,
723 struct v4l2_frequency_band *band)
724 {
725 if (band->tuner != 0)
726 return -EINVAL;
727 if (band->index >= ARRAY_SIZE(bands))
728 return -EINVAL;
729 *band = bands[band->index];
730 return 0;
731 }
732
733 const struct v4l2_ctrl_ops si470x_ctrl_ops = {
734 .s_ctrl = si470x_s_ctrl,
735 };
736
737 /*
738 * si470x_ioctl_ops - video device ioctl operations
739 */
740 static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
741 .vidioc_querycap = si470x_vidioc_querycap,
742 .vidioc_g_tuner = si470x_vidioc_g_tuner,
743 .vidioc_s_tuner = si470x_vidioc_s_tuner,
744 .vidioc_g_frequency = si470x_vidioc_g_frequency,
745 .vidioc_s_frequency = si470x_vidioc_s_frequency,
746 .vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek,
747 .vidioc_enum_freq_bands = si470x_vidioc_enum_freq_bands,
748 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
749 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
750 };
751
752
753 /*
754 * si470x_viddev_template - video device interface
755 */
756 struct video_device si470x_viddev_template = {
757 .fops = &si470x_fops,
758 .name = DRIVER_NAME,
759 .release = video_device_release_empty,
760 .ioctl_ops = &si470x_ioctl_ops,
761 };
Linux kernel - Deliverables
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