1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/media/radio/si470x/radio-si470x-common.c
4 *
5 * Driver for radios with Silicon Labs Si470x FM Radio Receivers
6 *
7 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
8 * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
9 */
10
11
12 /*
13 * History:
14 * 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net>
15 * Version 1.0.0
16 * - First working version
17 * 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net>
18 * Version 1.0.1
19 * - Improved error handling, every function now returns errno
20 * - Improved multi user access (start/mute/stop)
21 * - Channel doesn't get lost anymore after start/mute/stop
22 * - RDS support added (polling mode via interrupt EP 1)
23 * - marked default module parameters with *value*
24 * - switched from bit structs to bit masks
25 * - header file cleaned and integrated
26 * 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net>
27 * Version 1.0.2
28 * - hex values are now lower case
29 * - commented USB ID for ADS/Tech moved on todo list
30 * - blacklisted si470x in hid-quirks.c
31 * - rds buffer handling functions integrated into *_work, *_read
32 * - rds_command in si470x_poll exchanged against simple retval
33 * - check for firmware version 15
34 * - code order and prototypes still remain the same
35 * - spacing and bottom of band codes remain the same
36 * 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net>
37 * Version 1.0.3
38 * - code reordered to avoid function prototypes
39 * - switch/case defaults are now more user-friendly
40 * - unified comment style
41 * - applied all checkpatch.pl v1.12 suggestions
42 * except the warning about the too long lines with bit comments
43 * - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
44 * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net>
45 * Version 1.0.4
46 * - avoid poss. locking when doing copy_to_user which may sleep
47 * - RDS is automatically activated on read now
48 * - code cleaned of unnecessary rds_commands
49 * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
50 * (thanks to Guillaume RAMOUSSE)
51 * 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net>
52 * Version 1.0.5
53 * - number of seek_retries changed to tune_timeout
54 * - fixed problem with incomplete tune operations by own buffers
55 * - optimization of variables and printf types
56 * - improved error logging
57 * 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net>
58 * Oliver Neukum <oliver@neukum.org>
59 * Version 1.0.6
60 * - fixed coverity checker warnings in *_usb_driver_disconnect
61 * - probe()/open() race by correct ordering in probe()
62 * - DMA coherency rules by separate allocation of all buffers
63 * - use of endianness macros
64 * - abuse of spinlock, replaced by mutex
65 * - racy handling of timer in disconnect,
66 * replaced by delayed_work
67 * - racy interruptible_sleep_on(),
68 * replaced with wait_event_interruptible()
69 * - handle signals in read()
70 * 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net>
71 * Oliver Neukum <oliver@neukum.org>
72 * Version 1.0.7
73 * - usb autosuspend support
74 * - unplugging fixed
75 * 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net>
76 * Version 1.0.8
77 * - hardware frequency seek support
78 * - afc indication
79 * - more safety checks, let si470x_get_freq return errno
80 * - vidioc behavior corrected according to v4l2 spec
81 * 2008-10-20 Alexey Klimov <klimov.linux@gmail.com>
82 * - add support for KWorld USB FM Radio FM700
83 * - blacklisted KWorld radio in hid-core.c and hid-ids.h
84 * 2008-12-03 Mark Lord <mlord@pobox.com>
85 * - add support for DealExtreme USB Radio
86 * 2009-01-31 Bob Ross <pigiron@gmx.com>
87 * - correction of stereo detection/setting
88 * - correction of signal strength indicator scaling
89 * 2009-01-31 Rick Bronson <rick@efn.org>
90 * Tobias Lorenz <tobias.lorenz@gmx.net>
91 * - add LED status output
92 * - get HW/SW version from scratchpad
93 * 2009-06-16 Edouard Lafargue <edouard@lafargue.name>
94 * Version 1.0.10
95 * - add support for interrupt mode for RDS endpoint,
96 * instead of polling.
97 * Improves RDS reception significantly
98 */
99
100
101 /* kernel includes */
102 #include "radio-si470x.h"
103
104 /**************************************************************************
105 * Module Parameters
106 **************************************************************************/
107
108 /* Spacing (kHz) */
109 /* 0: 200 kHz (USA, Australia) */
110 /* 1: 100 kHz (Europe, Japan) */
111 /* 2: 50 kHz */
112 static unsigned short space = 2;
113 module_param(space, ushort, 0444);
114 MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
115
116 /* De-emphasis */
117 /* 0: 75 us (USA) */
118 /* 1: 50 us (Europe, Australia, Japan) */
119 static unsigned short de = 1;
120 module_param(de, ushort, 0444);
121 MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
122
123 /* Tune timeout */
124 static unsigned int tune_timeout = 3000;
125 module_param(tune_timeout, uint, 0644);
126 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
127
128 /* Seek timeout */
129 static unsigned int seek_timeout = 5000;
130 module_param(seek_timeout, uint, 0644);
131 MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
132
133 static const struct v4l2_frequency_band bands[] = {
134 {
135 .type = V4L2_TUNER_RADIO,
136 .index = 0,
137 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
138 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
139 V4L2_TUNER_CAP_FREQ_BANDS |
140 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
141 V4L2_TUNER_CAP_HWSEEK_WRAP,
142 .rangelow = 87500 * 16,
143 .rangehigh = 108000 * 16,
144 .modulation = V4L2_BAND_MODULATION_FM,
145 },
146 {
147 .type = V4L2_TUNER_RADIO,
148 .index = 1,
149 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
150 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
151 V4L2_TUNER_CAP_FREQ_BANDS |
152 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
153 V4L2_TUNER_CAP_HWSEEK_WRAP,
154 .rangelow = 76000 * 16,
155 .rangehigh = 108000 * 16,
156 .modulation = V4L2_BAND_MODULATION_FM,
157 },
158 {
159 .type = V4L2_TUNER_RADIO,
160 .index = 2,
161 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
162 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
163 V4L2_TUNER_CAP_FREQ_BANDS |
164 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
165 V4L2_TUNER_CAP_HWSEEK_WRAP,
166 .rangelow = 76000 * 16,
167 .rangehigh = 90000 * 16,
168 .modulation = V4L2_BAND_MODULATION_FM,
169 },
170 };
171
172 /**************************************************************************
173 * Generic Functions
174 **************************************************************************/
175
176 /*
177 * si470x_set_band - set the band
178 */
si470x_set_band(struct si470x_device * radio,int band)179 static int si470x_set_band(struct si470x_device *radio, int band)
180 {
181 if (radio->band == band)
182 return 0;
183
184 radio->band = band;
185 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND;
186 radio->registers[SYSCONFIG2] |= radio->band << 6;
187 return radio->set_register(radio, SYSCONFIG2);
188 }
189
190 /*
191 * si470x_set_chan - set the channel
192 */
si470x_set_chan(struct si470x_device * radio,unsigned short chan)193 static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
194 {
195 int retval;
196 unsigned long time_left;
197 bool timed_out = false;
198
199 retval = radio->get_register(radio, POWERCFG);
200 if (retval)
201 return retval;
202
203 if ((radio->registers[POWERCFG] & (POWERCFG_ENABLE|POWERCFG_DMUTE))
204 != (POWERCFG_ENABLE|POWERCFG_DMUTE)) {
205 return 0;
206 }
207
208 /* start tuning */
209 radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
210 radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
211 retval = radio->set_register(radio, CHANNEL);
212 if (retval < 0)
213 goto done;
214
215 /* wait till tune operation has completed */
216 reinit_completion(&radio->completion);
217 time_left = wait_for_completion_timeout(&radio->completion,
218 msecs_to_jiffies(tune_timeout));
219 if (time_left == 0)
220 timed_out = true;
221
222 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
223 dev_warn(&radio->videodev.dev, "tune does not complete\n");
224 if (timed_out)
225 dev_warn(&radio->videodev.dev,
226 "tune timed out after %u ms\n", tune_timeout);
227
228 /* stop tuning */
229 radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
230 retval = radio->set_register(radio, CHANNEL);
231
232 done:
233 return retval;
234 }
235
236 /*
237 * si470x_get_step - get channel spacing
238 */
si470x_get_step(struct si470x_device * radio)239 static unsigned int si470x_get_step(struct si470x_device *radio)
240 {
241 /* Spacing (kHz) */
242 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
243 /* 0: 200 kHz (USA, Australia) */
244 case 0:
245 return 200 * 16;
246 /* 1: 100 kHz (Europe, Japan) */
247 case 1:
248 return 100 * 16;
249 /* 2: 50 kHz */
250 default:
251 return 50 * 16;
252 }
253 }
254
255
256 /*
257 * si470x_get_freq - get the frequency
258 */
si470x_get_freq(struct si470x_device * radio,unsigned int * freq)259 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
260 {
261 int chan, retval;
262
263 /* read channel */
264 retval = radio->get_register(radio, READCHAN);
265 chan = radio->registers[READCHAN] & READCHAN_READCHAN;
266
267 /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
268 *freq = chan * si470x_get_step(radio) + bands[radio->band].rangelow;
269
270 return retval;
271 }
272
273
274 /*
275 * si470x_set_freq - set the frequency
276 */
si470x_set_freq(struct si470x_device * radio,unsigned int freq)277 int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
278 {
279 unsigned short chan;
280
281 freq = clamp(freq, bands[radio->band].rangelow,
282 bands[radio->band].rangehigh);
283 /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
284 chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio);
285
286 return si470x_set_chan(radio, chan);
287 }
288 EXPORT_SYMBOL_GPL(si470x_set_freq);
289
290
291 /*
292 * si470x_set_seek - set seek
293 */
si470x_set_seek(struct si470x_device * radio,const struct v4l2_hw_freq_seek * seek)294 static int si470x_set_seek(struct si470x_device *radio,
295 const struct v4l2_hw_freq_seek *seek)
296 {
297 int band, retval;
298 unsigned int freq;
299 bool timed_out = false;
300 unsigned long time_left;
301
302 /* set band */
303 if (seek->rangelow || seek->rangehigh) {
304 for (band = 0; band < ARRAY_SIZE(bands); band++) {
305 if (bands[band].rangelow == seek->rangelow &&
306 bands[band].rangehigh == seek->rangehigh)
307 break;
308 }
309 if (band == ARRAY_SIZE(bands))
310 return -EINVAL; /* No matching band found */
311 } else
312 band = 1; /* If nothing is specified seek 76 - 108 Mhz */
313
314 if (radio->band != band) {
315 retval = si470x_get_freq(radio, &freq);
316 if (retval)
317 return retval;
318 retval = si470x_set_band(radio, band);
319 if (retval)
320 return retval;
321 retval = si470x_set_freq(radio, freq);
322 if (retval)
323 return retval;
324 }
325
326 /* start seeking */
327 radio->registers[POWERCFG] |= POWERCFG_SEEK;
328 if (seek->wrap_around)
329 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
330 else
331 radio->registers[POWERCFG] |= POWERCFG_SKMODE;
332 if (seek->seek_upward)
333 radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
334 else
335 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
336 retval = radio->set_register(radio, POWERCFG);
337 if (retval < 0)
338 return retval;
339
340 /* wait till tune operation has completed */
341 reinit_completion(&radio->completion);
342 time_left = wait_for_completion_timeout(&radio->completion,
343 msecs_to_jiffies(seek_timeout));
344 if (time_left == 0)
345 timed_out = true;
346
347 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
348 dev_warn(&radio->videodev.dev, "seek does not complete\n");
349 if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
350 dev_warn(&radio->videodev.dev,
351 "seek failed / band limit reached\n");
352
353 /* stop seeking */
354 radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
355 retval = radio->set_register(radio, POWERCFG);
356
357 /* try again, if timed out */
358 if (retval == 0 && timed_out)
359 return -ENODATA;
360 return retval;
361 }
362
363
364 /*
365 * si470x_start - switch on radio
366 */
si470x_start(struct si470x_device * radio)367 int si470x_start(struct si470x_device *radio)
368 {
369 int retval;
370
371 /* powercfg */
372 radio->registers[POWERCFG] =
373 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
374 retval = radio->set_register(radio, POWERCFG);
375 if (retval < 0)
376 goto done;
377
378 /* sysconfig 1 */
379 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDSIEN | SYSCONFIG1_STCIEN |
380 SYSCONFIG1_RDS;
381 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
382 radio->registers[SYSCONFIG1] |= SYSCONFIG1_GPIO2_INT;
383 if (de)
384 radio->registers[SYSCONFIG1] |= SYSCONFIG1_DE;
385 retval = radio->set_register(radio, SYSCONFIG1);
386 if (retval < 0)
387 goto done;
388
389 /* sysconfig 2 */
390 radio->registers[SYSCONFIG2] =
391 (0x1f << 8) | /* SEEKTH */
392 ((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */
393 ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
394 15; /* VOLUME (max) */
395 retval = radio->set_register(radio, SYSCONFIG2);
396 if (retval < 0)
397 goto done;
398
399 /* reset last channel */
400 retval = si470x_set_chan(radio,
401 radio->registers[CHANNEL] & CHANNEL_CHAN);
402
403 done:
404 return retval;
405 }
406 EXPORT_SYMBOL_GPL(si470x_start);
407
408
409 /*
410 * si470x_stop - switch off radio
411 */
si470x_stop(struct si470x_device * radio)412 int si470x_stop(struct si470x_device *radio)
413 {
414 int retval;
415
416 /* sysconfig 1 */
417 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
418 retval = radio->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 = radio->set_register(radio, POWERCFG);
427
428 done:
429 return retval;
430 }
431 EXPORT_SYMBOL_GPL(si470x_stop);
432
433
434 /*
435 * si470x_rds_on - switch on rds reception
436 */
si470x_rds_on(struct si470x_device * radio)437 static int si470x_rds_on(struct si470x_device *radio)
438 {
439 int retval;
440
441 /* sysconfig 1 */
442 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
443 retval = radio->set_register(radio, SYSCONFIG1);
444 if (retval < 0)
445 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
446
447 return retval;
448 }
449
450
451
452 /**************************************************************************
453 * File Operations Interface
454 **************************************************************************/
455
456 /*
457 * si470x_fops_read - read RDS data
458 */
si470x_fops_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)459 static ssize_t si470x_fops_read(struct file *file, char __user *buf,
460 size_t count, loff_t *ppos)
461 {
462 struct si470x_device *radio = video_drvdata(file);
463 int retval = 0;
464 unsigned int block_count = 0;
465
466 /* switch on rds reception */
467 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
468 si470x_rds_on(radio);
469
470 /* block if no new data available */
471 while (radio->wr_index == radio->rd_index) {
472 if (file->f_flags & O_NONBLOCK) {
473 retval = -EWOULDBLOCK;
474 goto done;
475 }
476 if (wait_event_interruptible(radio->read_queue,
477 radio->wr_index != radio->rd_index) < 0) {
478 retval = -EINTR;
479 goto done;
480 }
481 }
482
483 /* calculate block count from byte count */
484 count /= 3;
485
486 /* copy RDS block out of internal buffer and to user buffer */
487 while (block_count < count) {
488 if (radio->rd_index == radio->wr_index)
489 break;
490
491 /* always transfer rds complete blocks */
492 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
493 /* retval = -EFAULT; */
494 break;
495
496 /* increment and wrap read pointer */
497 radio->rd_index += 3;
498 if (radio->rd_index >= radio->buf_size)
499 radio->rd_index = 0;
500
501 /* increment counters */
502 block_count++;
503 buf += 3;
504 retval += 3;
505 }
506
507 done:
508 return retval;
509 }
510
511
512 /*
513 * si470x_fops_poll - poll RDS data
514 */
si470x_fops_poll(struct file * file,struct poll_table_struct * pts)515 static __poll_t si470x_fops_poll(struct file *file,
516 struct poll_table_struct *pts)
517 {
518 struct si470x_device *radio = video_drvdata(file);
519 __poll_t req_events = poll_requested_events(pts);
520 __poll_t retval = v4l2_ctrl_poll(file, pts);
521
522 if (req_events & (EPOLLIN | EPOLLRDNORM)) {
523 /* switch on rds reception */
524 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
525 si470x_rds_on(radio);
526
527 poll_wait(file, &radio->read_queue, pts);
528
529 if (radio->rd_index != radio->wr_index)
530 retval |= EPOLLIN | EPOLLRDNORM;
531 }
532
533 return retval;
534 }
535
536
si470x_fops_open(struct file * file)537 static int si470x_fops_open(struct file *file)
538 {
539 struct si470x_device *radio = video_drvdata(file);
540
541 return radio->fops_open(file);
542 }
543
544
545 /*
546 * si470x_fops_release - file release
547 */
si470x_fops_release(struct file * file)548 static int si470x_fops_release(struct file *file)
549 {
550 struct si470x_device *radio = video_drvdata(file);
551
552 return radio->fops_release(file);
553 }
554
555
556 /*
557 * si470x_fops - file operations interface
558 */
559 static const struct v4l2_file_operations si470x_fops = {
560 .owner = THIS_MODULE,
561 .read = si470x_fops_read,
562 .poll = si470x_fops_poll,
563 .unlocked_ioctl = video_ioctl2,
564 .open = si470x_fops_open,
565 .release = si470x_fops_release,
566 };
567
568
569
570 /**************************************************************************
571 * Video4Linux Interface
572 **************************************************************************/
573
574
si470x_s_ctrl(struct v4l2_ctrl * ctrl)575 static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
576 {
577 struct si470x_device *radio =
578 container_of(ctrl->handler, struct si470x_device, hdl);
579
580 switch (ctrl->id) {
581 case V4L2_CID_AUDIO_VOLUME:
582 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
583 radio->registers[SYSCONFIG2] |= ctrl->val;
584 return radio->set_register(radio, SYSCONFIG2);
585 case V4L2_CID_AUDIO_MUTE:
586 if (ctrl->val)
587 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
588 else
589 radio->registers[POWERCFG] |= POWERCFG_DMUTE;
590 return radio->set_register(radio, POWERCFG);
591 default:
592 return -EINVAL;
593 }
594 }
595
596
597 /*
598 * si470x_vidioc_g_tuner - get tuner attributes
599 */
si470x_vidioc_g_tuner(struct file * file,void * priv,struct v4l2_tuner * tuner)600 static int si470x_vidioc_g_tuner(struct file *file, void *priv,
601 struct v4l2_tuner *tuner)
602 {
603 struct si470x_device *radio = video_drvdata(file);
604 int retval = 0;
605
606 if (tuner->index != 0)
607 return -EINVAL;
608
609 if (!radio->status_rssi_auto_update) {
610 retval = radio->get_register(radio, STATUSRSSI);
611 if (retval < 0)
612 return retval;
613 }
614
615 /* driver constants */
616 strscpy(tuner->name, "FM", sizeof(tuner->name));
617 tuner->type = V4L2_TUNER_RADIO;
618 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
619 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
620 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
621 V4L2_TUNER_CAP_HWSEEK_WRAP;
622 tuner->rangelow = 76 * FREQ_MUL;
623 tuner->rangehigh = 108 * FREQ_MUL;
624
625 /* stereo indicator == stereo (instead of mono) */
626 if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
627 tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
628 else
629 tuner->rxsubchans = V4L2_TUNER_SUB_STEREO;
630 /* If there is a reliable method of detecting an RDS channel,
631 then this code should check for that before setting this
632 RDS subchannel. */
633 tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
634
635 /* mono/stereo selector */
636 if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
637 tuner->audmode = V4L2_TUNER_MODE_STEREO;
638 else
639 tuner->audmode = V4L2_TUNER_MODE_MONO;
640
641 /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
642 /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */
643 tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
644 /* the ideal factor is 0xffff/75 = 873,8 */
645 tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
646 if (tuner->signal > 0xffff)
647 tuner->signal = 0xffff;
648
649 /* automatic frequency control: -1: freq to low, 1 freq to high */
650 /* AFCRL does only indicate that freq. differs, not if too low/high */
651 tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
652
653 return retval;
654 }
655
656
657 /*
658 * si470x_vidioc_s_tuner - set tuner attributes
659 */
si470x_vidioc_s_tuner(struct file * file,void * priv,const struct v4l2_tuner * tuner)660 static int si470x_vidioc_s_tuner(struct file *file, void *priv,
661 const struct v4l2_tuner *tuner)
662 {
663 struct si470x_device *radio = video_drvdata(file);
664
665 if (tuner->index != 0)
666 return -EINVAL;
667
668 /* mono/stereo selector */
669 switch (tuner->audmode) {
670 case V4L2_TUNER_MODE_MONO:
671 radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */
672 break;
673 case V4L2_TUNER_MODE_STEREO:
674 default:
675 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
676 break;
677 }
678
679 return radio->set_register(radio, POWERCFG);
680 }
681
682
683 /*
684 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
685 */
si470x_vidioc_g_frequency(struct file * file,void * priv,struct v4l2_frequency * freq)686 static int si470x_vidioc_g_frequency(struct file *file, void *priv,
687 struct v4l2_frequency *freq)
688 {
689 struct si470x_device *radio = video_drvdata(file);
690
691 if (freq->tuner != 0)
692 return -EINVAL;
693
694 freq->type = V4L2_TUNER_RADIO;
695 return si470x_get_freq(radio, &freq->frequency);
696 }
697
698
699 /*
700 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
701 */
si470x_vidioc_s_frequency(struct file * file,void * priv,const struct v4l2_frequency * freq)702 static int si470x_vidioc_s_frequency(struct file *file, void *priv,
703 const struct v4l2_frequency *freq)
704 {
705 struct si470x_device *radio = video_drvdata(file);
706 int retval;
707
708 if (freq->tuner != 0)
709 return -EINVAL;
710
711 if (freq->frequency < bands[radio->band].rangelow ||
712 freq->frequency > bands[radio->band].rangehigh) {
713 /* Switch to band 1 which covers everything we support */
714 retval = si470x_set_band(radio, 1);
715 if (retval)
716 return retval;
717 }
718 return si470x_set_freq(radio, freq->frequency);
719 }
720
721
722 /*
723 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
724 */
si470x_vidioc_s_hw_freq_seek(struct file * file,void * priv,const struct v4l2_hw_freq_seek * seek)725 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
726 const struct v4l2_hw_freq_seek *seek)
727 {
728 struct si470x_device *radio = video_drvdata(file);
729
730 if (seek->tuner != 0)
731 return -EINVAL;
732
733 if (file->f_flags & O_NONBLOCK)
734 return -EWOULDBLOCK;
735
736 return si470x_set_seek(radio, seek);
737 }
738
739 /*
740 * si470x_vidioc_enum_freq_bands - enumerate supported bands
741 */
si470x_vidioc_enum_freq_bands(struct file * file,void * priv,struct v4l2_frequency_band * band)742 static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv,
743 struct v4l2_frequency_band *band)
744 {
745 if (band->tuner != 0)
746 return -EINVAL;
747 if (band->index >= ARRAY_SIZE(bands))
748 return -EINVAL;
749 *band = bands[band->index];
750 return 0;
751 }
752
753 const struct v4l2_ctrl_ops si470x_ctrl_ops = {
754 .s_ctrl = si470x_s_ctrl,
755 };
756 EXPORT_SYMBOL_GPL(si470x_ctrl_ops);
757
si470x_vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * capability)758 static int si470x_vidioc_querycap(struct file *file, void *priv,
759 struct v4l2_capability *capability)
760 {
761 struct si470x_device *radio = video_drvdata(file);
762
763 return radio->vidioc_querycap(file, priv, capability);
764 };
765
766 /*
767 * si470x_ioctl_ops - video device ioctl operations
768 */
769 static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
770 .vidioc_querycap = si470x_vidioc_querycap,
771 .vidioc_g_tuner = si470x_vidioc_g_tuner,
772 .vidioc_s_tuner = si470x_vidioc_s_tuner,
773 .vidioc_g_frequency = si470x_vidioc_g_frequency,
774 .vidioc_s_frequency = si470x_vidioc_s_frequency,
775 .vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek,
776 .vidioc_enum_freq_bands = si470x_vidioc_enum_freq_bands,
777 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
778 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
779 };
780
781
782 /*
783 * si470x_viddev_template - video device interface
784 */
785 const struct video_device si470x_viddev_template = {
786 .fops = &si470x_fops,
787 .name = DRIVER_NAME,
788 .release = video_device_release_empty,
789 .ioctl_ops = &si470x_ioctl_ops,
790 };
791 EXPORT_SYMBOL_GPL(si470x_viddev_template);
792
793 MODULE_DESCRIPTION("Core radio driver for Si470x FM Radio Receivers");
794 MODULE_LICENSE("GPL");
795