2 * drivers/media/radio/si470x/radio-si470x-common.c
4 * Driver for radios with Silicon Labs Si470x FM Radio Receivers
6 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
7 * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
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.
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.
23 * 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net>
25 * - First working version
26 * 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net>
28 * - Improved error handling, every function now returns errno
29 * - Improved multi user access (start/mute/stop)
30 * - Channel doesn't get lost anymore after start/mute/stop
31 * - RDS support added (polling mode via interrupt EP 1)
32 * - marked default module parameters with *value*
33 * - switched from bit structs to bit masks
34 * - header file cleaned and integrated
35 * 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net>
37 * - hex values are now lower case
38 * - commented USB ID for ADS/Tech moved on todo list
39 * - blacklisted si470x in hid-quirks.c
40 * - rds buffer handling functions integrated into *_work, *_read
41 * - rds_command in si470x_poll exchanged against simple retval
42 * - check for firmware version 15
43 * - code order and prototypes still remain the same
44 * - spacing and bottom of band codes remain the same
45 * 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net>
47 * - code reordered to avoid function prototypes
48 * - switch/case defaults are now more user-friendly
49 * - unified comment style
50 * - applied all checkpatch.pl v1.12 suggestions
51 * except the warning about the too long lines with bit comments
52 * - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
53 * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net>
55 * - avoid poss. locking when doing copy_to_user which may sleep
56 * - RDS is automatically activated on read now
57 * - code cleaned of unnecessary rds_commands
58 * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
59 * (thanks to Guillaume RAMOUSSE)
60 * 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net>
62 * - number of seek_retries changed to tune_timeout
63 * - fixed problem with incomplete tune operations by own buffers
64 * - optimization of variables and printf types
65 * - improved error logging
66 * 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net>
67 * Oliver Neukum <oliver@neukum.org>
69 * - fixed coverity checker warnings in *_usb_driver_disconnect
70 * - probe()/open() race by correct ordering in probe()
71 * - DMA coherency rules by separate allocation of all buffers
72 * - use of endianness macros
73 * - abuse of spinlock, replaced by mutex
74 * - racy handling of timer in disconnect,
75 * replaced by delayed_work
76 * - racy interruptible_sleep_on(),
77 * replaced with wait_event_interruptible()
78 * - handle signals in read()
79 * 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net>
80 * Oliver Neukum <oliver@neukum.org>
82 * - usb autosuspend support
84 * 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net>
86 * - hardware frequency seek support
88 * - more safety checks, let si470x_get_freq return errno
89 * - vidioc behavior corrected according to v4l2 spec
90 * 2008-10-20 Alexey Klimov <klimov.linux@gmail.com>
91 * - add support for KWorld USB FM Radio FM700
92 * - blacklisted KWorld radio in hid-core.c and hid-ids.h
93 * 2008-12-03 Mark Lord <mlord@pobox.com>
94 * - add support for DealExtreme USB Radio
95 * 2009-01-31 Bob Ross <pigiron@gmx.com>
96 * - correction of stereo detection/setting
97 * - correction of signal strength indicator scaling
98 * 2009-01-31 Rick Bronson <rick@efn.org>
99 * Tobias Lorenz <tobias.lorenz@gmx.net>
100 * - add LED status output
101 * - get HW/SW version from scratchpad
102 * 2009-06-16 Edouard Lafargue <edouard@lafargue.name>
104 * - add support for interrupt mode for RDS endpoint,
105 * instead of polling.
106 * Improves RDS reception significantly
110 /* kernel includes */
111 #include "radio-si470x.h"
113 /**************************************************************************
115 **************************************************************************/
118 /* 0: 200 kHz (USA, Australia) */
119 /* 1: 100 kHz (Europe, Japan) */
121 static unsigned short space = 2;
122 module_param(space, ushort, 0444);
123 MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
127 /* 1: 50 us (Europe, Australia, Japan) */
128 static unsigned short de = 1;
129 module_param(de, ushort, 0444);
130 MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
133 static unsigned int tune_timeout = 3000;
134 module_param(tune_timeout, uint, 0644);
135 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
138 static unsigned int seek_timeout = 5000;
139 module_param(seek_timeout, uint, 0644);
140 MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
142 static const struct v4l2_frequency_band bands[] = {
144 .type = V4L2_TUNER_RADIO,
146 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
147 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
148 V4L2_TUNER_CAP_FREQ_BANDS |
149 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
150 V4L2_TUNER_CAP_HWSEEK_WRAP,
151 .rangelow = 87500 * 16,
152 .rangehigh = 108000 * 16,
153 .modulation = V4L2_BAND_MODULATION_FM,
156 .type = V4L2_TUNER_RADIO,
158 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
159 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
160 V4L2_TUNER_CAP_FREQ_BANDS |
161 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
162 V4L2_TUNER_CAP_HWSEEK_WRAP,
163 .rangelow = 76000 * 16,
164 .rangehigh = 108000 * 16,
165 .modulation = V4L2_BAND_MODULATION_FM,
168 .type = V4L2_TUNER_RADIO,
170 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
171 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
172 V4L2_TUNER_CAP_FREQ_BANDS |
173 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
174 V4L2_TUNER_CAP_HWSEEK_WRAP,
175 .rangelow = 76000 * 16,
176 .rangehigh = 90000 * 16,
177 .modulation = V4L2_BAND_MODULATION_FM,
181 /**************************************************************************
183 **************************************************************************/
186 * si470x_set_band - set the band
188 static int si470x_set_band(struct si470x_device *radio, int band)
190 if (radio->band == band)
194 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND;
195 radio->registers[SYSCONFIG2] |= radio->band << 6;
196 return radio->set_register(radio, SYSCONFIG2);
200 * si470x_set_chan - set the channel
202 static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
205 unsigned long time_left;
206 bool timed_out = false;
208 retval = radio->get_register(radio, POWERCFG);
212 if ((radio->registers[POWERCFG] & (POWERCFG_ENABLE|POWERCFG_DMUTE))
213 != (POWERCFG_ENABLE|POWERCFG_DMUTE)) {
218 radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
219 radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
220 retval = radio->set_register(radio, CHANNEL);
224 /* wait till tune operation has completed */
225 reinit_completion(&radio->completion);
226 time_left = wait_for_completion_timeout(&radio->completion,
227 msecs_to_jiffies(tune_timeout));
231 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
232 dev_warn(&radio->videodev.dev, "tune does not complete\n");
234 dev_warn(&radio->videodev.dev,
235 "tune timed out after %u ms\n", tune_timeout);
238 radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
239 retval = radio->set_register(radio, CHANNEL);
246 * si470x_get_step - get channel spacing
248 static unsigned int si470x_get_step(struct si470x_device *radio)
251 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
252 /* 0: 200 kHz (USA, Australia) */
255 /* 1: 100 kHz (Europe, Japan) */
266 * si470x_get_freq - get the frequency
268 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
273 retval = radio->get_register(radio, READCHAN);
274 chan = radio->registers[READCHAN] & READCHAN_READCHAN;
276 /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
277 *freq = chan * si470x_get_step(radio) + bands[radio->band].rangelow;
284 * si470x_set_freq - set the frequency
286 int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
290 freq = clamp(freq, bands[radio->band].rangelow,
291 bands[radio->band].rangehigh);
292 /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
293 chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio);
295 return si470x_set_chan(radio, chan);
297 EXPORT_SYMBOL_GPL(si470x_set_freq);
301 * si470x_set_seek - set seek
303 static int si470x_set_seek(struct si470x_device *radio,
304 const struct v4l2_hw_freq_seek *seek)
308 bool timed_out = false;
309 unsigned long time_left;
312 if (seek->rangelow || seek->rangehigh) {
313 for (band = 0; band < ARRAY_SIZE(bands); band++) {
314 if (bands[band].rangelow == seek->rangelow &&
315 bands[band].rangehigh == seek->rangehigh)
318 if (band == ARRAY_SIZE(bands))
319 return -EINVAL; /* No matching band found */
321 band = 1; /* If nothing is specified seek 76 - 108 Mhz */
323 if (radio->band != band) {
324 retval = si470x_get_freq(radio, &freq);
327 retval = si470x_set_band(radio, band);
330 retval = si470x_set_freq(radio, freq);
336 radio->registers[POWERCFG] |= POWERCFG_SEEK;
337 if (seek->wrap_around)
338 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
340 radio->registers[POWERCFG] |= POWERCFG_SKMODE;
341 if (seek->seek_upward)
342 radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
344 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
345 retval = radio->set_register(radio, POWERCFG);
349 /* wait till tune operation has completed */
350 reinit_completion(&radio->completion);
351 time_left = wait_for_completion_timeout(&radio->completion,
352 msecs_to_jiffies(seek_timeout));
356 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
357 dev_warn(&radio->videodev.dev, "seek does not complete\n");
358 if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
359 dev_warn(&radio->videodev.dev,
360 "seek failed / band limit reached\n");
363 radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
364 retval = radio->set_register(radio, POWERCFG);
366 /* try again, if timed out */
367 if (retval == 0 && timed_out)
374 * si470x_start - switch on radio
376 int si470x_start(struct si470x_device *radio)
381 radio->registers[POWERCFG] =
382 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
383 retval = radio->set_register(radio, POWERCFG);
388 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDSIEN | SYSCONFIG1_STCIEN |
390 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
391 radio->registers[SYSCONFIG1] |= SYSCONFIG1_GPIO2_INT;
393 radio->registers[SYSCONFIG1] |= SYSCONFIG1_DE;
394 retval = radio->set_register(radio, SYSCONFIG1);
399 radio->registers[SYSCONFIG2] =
400 (0x1f << 8) | /* SEEKTH */
401 ((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */
402 ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
403 15; /* VOLUME (max) */
404 retval = radio->set_register(radio, SYSCONFIG2);
408 /* reset last channel */
409 retval = si470x_set_chan(radio,
410 radio->registers[CHANNEL] & CHANNEL_CHAN);
415 EXPORT_SYMBOL_GPL(si470x_start);
419 * si470x_stop - switch off radio
421 int si470x_stop(struct si470x_device *radio)
426 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
427 retval = radio->set_register(radio, SYSCONFIG1);
432 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
433 /* POWERCFG_ENABLE has to automatically go low */
434 radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
435 retval = radio->set_register(radio, POWERCFG);
440 EXPORT_SYMBOL_GPL(si470x_stop);
444 * si470x_rds_on - switch on rds reception
446 static int si470x_rds_on(struct si470x_device *radio)
451 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
452 retval = radio->set_register(radio, SYSCONFIG1);
454 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
461 /**************************************************************************
462 * File Operations Interface
463 **************************************************************************/
466 * si470x_fops_read - read RDS data
468 static ssize_t si470x_fops_read(struct file *file, char __user *buf,
469 size_t count, loff_t *ppos)
471 struct si470x_device *radio = video_drvdata(file);
473 unsigned int block_count = 0;
475 /* switch on rds reception */
476 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
477 si470x_rds_on(radio);
479 /* block if no new data available */
480 while (radio->wr_index == radio->rd_index) {
481 if (file->f_flags & O_NONBLOCK) {
482 retval = -EWOULDBLOCK;
485 if (wait_event_interruptible(radio->read_queue,
486 radio->wr_index != radio->rd_index) < 0) {
492 /* calculate block count from byte count */
495 /* copy RDS block out of internal buffer and to user buffer */
496 while (block_count < count) {
497 if (radio->rd_index == radio->wr_index)
500 /* always transfer rds complete blocks */
501 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
502 /* retval = -EFAULT; */
505 /* increment and wrap read pointer */
506 radio->rd_index += 3;
507 if (radio->rd_index >= radio->buf_size)
510 /* increment counters */
522 * si470x_fops_poll - poll RDS data
524 static __poll_t si470x_fops_poll(struct file *file,
525 struct poll_table_struct *pts)
527 struct si470x_device *radio = video_drvdata(file);
528 __poll_t req_events = poll_requested_events(pts);
529 __poll_t retval = v4l2_ctrl_poll(file, pts);
531 if (req_events & (EPOLLIN | EPOLLRDNORM)) {
532 /* switch on rds reception */
533 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
534 si470x_rds_on(radio);
536 poll_wait(file, &radio->read_queue, pts);
538 if (radio->rd_index != radio->wr_index)
539 retval |= EPOLLIN | EPOLLRDNORM;
546 static int si470x_fops_open(struct file *file)
548 struct si470x_device *radio = video_drvdata(file);
550 return radio->fops_open(file);
555 * si470x_fops_release - file release
557 static int si470x_fops_release(struct file *file)
559 struct si470x_device *radio = video_drvdata(file);
561 return radio->fops_release(file);
566 * si470x_fops - file operations interface
568 static const struct v4l2_file_operations si470x_fops = {
569 .owner = THIS_MODULE,
570 .read = si470x_fops_read,
571 .poll = si470x_fops_poll,
572 .unlocked_ioctl = video_ioctl2,
573 .open = si470x_fops_open,
574 .release = si470x_fops_release,
579 /**************************************************************************
580 * Video4Linux Interface
581 **************************************************************************/
584 static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
586 struct si470x_device *radio =
587 container_of(ctrl->handler, struct si470x_device, hdl);
590 case V4L2_CID_AUDIO_VOLUME:
591 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
592 radio->registers[SYSCONFIG2] |= ctrl->val;
593 return radio->set_register(radio, SYSCONFIG2);
594 case V4L2_CID_AUDIO_MUTE:
596 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
598 radio->registers[POWERCFG] |= POWERCFG_DMUTE;
599 return radio->set_register(radio, POWERCFG);
607 * si470x_vidioc_g_tuner - get tuner attributes
609 static int si470x_vidioc_g_tuner(struct file *file, void *priv,
610 struct v4l2_tuner *tuner)
612 struct si470x_device *radio = video_drvdata(file);
615 if (tuner->index != 0)
618 if (!radio->status_rssi_auto_update) {
619 retval = radio->get_register(radio, STATUSRSSI);
624 /* driver constants */
625 strscpy(tuner->name, "FM", sizeof(tuner->name));
626 tuner->type = V4L2_TUNER_RADIO;
627 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
628 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
629 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
630 V4L2_TUNER_CAP_HWSEEK_WRAP;
631 tuner->rangelow = 76 * FREQ_MUL;
632 tuner->rangehigh = 108 * FREQ_MUL;
634 /* stereo indicator == stereo (instead of mono) */
635 if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
636 tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
638 tuner->rxsubchans = V4L2_TUNER_SUB_STEREO;
639 /* If there is a reliable method of detecting an RDS channel,
640 then this code should check for that before setting this
642 tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
644 /* mono/stereo selector */
645 if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
646 tuner->audmode = V4L2_TUNER_MODE_STEREO;
648 tuner->audmode = V4L2_TUNER_MODE_MONO;
650 /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
651 /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */
652 tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
653 /* the ideal factor is 0xffff/75 = 873,8 */
654 tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
655 if (tuner->signal > 0xffff)
656 tuner->signal = 0xffff;
658 /* automatic frequency control: -1: freq to low, 1 freq to high */
659 /* AFCRL does only indicate that freq. differs, not if too low/high */
660 tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
667 * si470x_vidioc_s_tuner - set tuner attributes
669 static int si470x_vidioc_s_tuner(struct file *file, void *priv,
670 const struct v4l2_tuner *tuner)
672 struct si470x_device *radio = video_drvdata(file);
674 if (tuner->index != 0)
677 /* mono/stereo selector */
678 switch (tuner->audmode) {
679 case V4L2_TUNER_MODE_MONO:
680 radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */
682 case V4L2_TUNER_MODE_STEREO:
684 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
688 return radio->set_register(radio, POWERCFG);
693 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
695 static int si470x_vidioc_g_frequency(struct file *file, void *priv,
696 struct v4l2_frequency *freq)
698 struct si470x_device *radio = video_drvdata(file);
700 if (freq->tuner != 0)
703 freq->type = V4L2_TUNER_RADIO;
704 return si470x_get_freq(radio, &freq->frequency);
709 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
711 static int si470x_vidioc_s_frequency(struct file *file, void *priv,
712 const struct v4l2_frequency *freq)
714 struct si470x_device *radio = video_drvdata(file);
717 if (freq->tuner != 0)
720 if (freq->frequency < bands[radio->band].rangelow ||
721 freq->frequency > bands[radio->band].rangehigh) {
722 /* Switch to band 1 which covers everything we support */
723 retval = si470x_set_band(radio, 1);
727 return si470x_set_freq(radio, freq->frequency);
732 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
734 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
735 const struct v4l2_hw_freq_seek *seek)
737 struct si470x_device *radio = video_drvdata(file);
739 if (seek->tuner != 0)
742 if (file->f_flags & O_NONBLOCK)
745 return si470x_set_seek(radio, seek);
749 * si470x_vidioc_enum_freq_bands - enumerate supported bands
751 static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv,
752 struct v4l2_frequency_band *band)
754 if (band->tuner != 0)
756 if (band->index >= ARRAY_SIZE(bands))
758 *band = bands[band->index];
762 const struct v4l2_ctrl_ops si470x_ctrl_ops = {
763 .s_ctrl = si470x_s_ctrl,
765 EXPORT_SYMBOL_GPL(si470x_ctrl_ops);
767 static int si470x_vidioc_querycap(struct file *file, void *priv,
768 struct v4l2_capability *capability)
770 struct si470x_device *radio = video_drvdata(file);
772 return radio->vidioc_querycap(file, priv, capability);
776 * si470x_ioctl_ops - video device ioctl operations
778 static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
779 .vidioc_querycap = si470x_vidioc_querycap,
780 .vidioc_g_tuner = si470x_vidioc_g_tuner,
781 .vidioc_s_tuner = si470x_vidioc_s_tuner,
782 .vidioc_g_frequency = si470x_vidioc_g_frequency,
783 .vidioc_s_frequency = si470x_vidioc_s_frequency,
784 .vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek,
785 .vidioc_enum_freq_bands = si470x_vidioc_enum_freq_bands,
786 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
787 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
792 * si470x_viddev_template - video device interface
794 const struct video_device si470x_viddev_template = {
795 .fops = &si470x_fops,
797 .release = video_device_release_empty,
798 .ioctl_ops = &si470x_ioctl_ops,
800 EXPORT_SYMBOL_GPL(si470x_viddev_template);
802 MODULE_LICENSE("GPL");