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authorJoonyoung Shim <jy0922.shim@samsung.com>2009-08-09 13:22:20 -0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-09-12 11:18:40 -0400
commitb09cd16354454daa1f047b4982691a3826787a0b (patch)
tree8969ec668f879f1a4b77b4c22ab106f1ea89db84 /drivers/media/radio/si470x
parent4efa2d75d4a3b86c2d47c422237c848d1f04ba58 (diff)
V4L/DVB (12413): radio-si470x: separate common and usb code
This patch is a preceding work to add the i2c interface of si470x. The si470x directory includes a common file and usb specific file and header file. The part unrelated with usb interface and i2c interface exists in radio-si470x-common.c file, and The usb specific part exists in radio-si470x-usb.c file. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> [tobias.lorenz@gmx.net: Small changes, due to new include "linux/smp_lock.h"] Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/radio/si470x')
-rw-r--r--drivers/media/radio/si470x/Kconfig24
-rw-r--r--drivers/media/radio/si470x/Makefile7
-rw-r--r--drivers/media/radio/si470x/radio-si470x-common.c794
-rw-r--r--drivers/media/radio/si470x/radio-si470x-usb.c958
-rw-r--r--drivers/media/radio/si470x/radio-si470x.h201
5 files changed, 1984 insertions, 0 deletions
diff --git a/drivers/media/radio/si470x/Kconfig b/drivers/media/radio/si470x/Kconfig
new file mode 100644
index 000000000000..20d05c04fa27
--- /dev/null
+++ b/drivers/media/radio/si470x/Kconfig
@@ -0,0 +1,24 @@
1config USB_SI470X
2 tristate "Silicon Labs Si470x FM Radio Receiver support with USB"
3 depends on USB && RADIO_SI470X
4 ---help---
5 This is a driver for USB devices with the Silicon Labs SI470x
6 chip. Currently these devices are known to work:
7 - 10c4:818a: Silicon Labs USB FM Radio Reference Design
8 - 06e1:a155: ADS/Tech FM Radio Receiver (formerly Instant FM Music)
9 - 1b80:d700: KWorld USB FM Radio SnapMusic Mobile 700 (FM700)
10 - 10c5:819a: Sanei Electric FM USB Radio (aka DealExtreme.com PCear)
11
12 Sound is provided by the ALSA USB Audio/MIDI driver. Therefore
13 if you don't want to use the device solely for RDS receiving,
14 it is recommended to also select SND_USB_AUDIO.
15
16 Please have a look at the documentation, especially on how
17 to redirect the audio stream from the radio to your sound device:
18 Documentation/video4linux/si470x.txt
19
20 Say Y here if you want to connect this type of radio to your
21 computer's USB port.
22
23 To compile this driver as a module, choose M here: the
24 module will be called radio-usb-si470x.
diff --git a/drivers/media/radio/si470x/Makefile b/drivers/media/radio/si470x/Makefile
new file mode 100644
index 000000000000..3cb777fe36bf
--- /dev/null
+++ b/drivers/media/radio/si470x/Makefile
@@ -0,0 +1,7 @@
1#
2# Makefile for radios with Silicon Labs Si470x FM Radio Receivers
3#
4
5radio-usb-si470x-objs := radio-si470x-usb.o radio-si470x-common.o
6
7obj-$(CONFIG_USB_SI470X) += radio-usb-si470x.o
diff --git a/drivers/media/radio/si470x/radio-si470x-common.c b/drivers/media/radio/si470x/radio-si470x-common.c
new file mode 100644
index 000000000000..b64559d561e5
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-common.c
@@ -0,0 +1,794 @@
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 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24/*
25 * History:
26 * 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net>
27 * Version 1.0.0
28 * - First working version
29 * 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net>
30 * Version 1.0.1
31 * - Improved error handling, every function now returns errno
32 * - Improved multi user access (start/mute/stop)
33 * - Channel doesn't get lost anymore after start/mute/stop
34 * - RDS support added (polling mode via interrupt EP 1)
35 * - marked default module parameters with *value*
36 * - switched from bit structs to bit masks
37 * - header file cleaned and integrated
38 * 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net>
39 * Version 1.0.2
40 * - hex values are now lower case
41 * - commented USB ID for ADS/Tech moved on todo list
42 * - blacklisted si470x in hid-quirks.c
43 * - rds buffer handling functions integrated into *_work, *_read
44 * - rds_command in si470x_poll exchanged against simple retval
45 * - check for firmware version 15
46 * - code order and prototypes still remain the same
47 * - spacing and bottom of band codes remain the same
48 * 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net>
49 * Version 1.0.3
50 * - code reordered to avoid function prototypes
51 * - switch/case defaults are now more user-friendly
52 * - unified comment style
53 * - applied all checkpatch.pl v1.12 suggestions
54 * except the warning about the too long lines with bit comments
55 * - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
56 * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net>
57 * Version 1.0.4
58 * - avoid poss. locking when doing copy_to_user which may sleep
59 * - RDS is automatically activated on read now
60 * - code cleaned of unnecessary rds_commands
61 * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
62 * (thanks to Guillaume RAMOUSSE)
63 * 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net>
64 * Version 1.0.5
65 * - number of seek_retries changed to tune_timeout
66 * - fixed problem with incomplete tune operations by own buffers
67 * - optimization of variables and printf types
68 * - improved error logging
69 * 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net>
70 * Oliver Neukum <oliver@neukum.org>
71 * Version 1.0.6
72 * - fixed coverity checker warnings in *_usb_driver_disconnect
73 * - probe()/open() race by correct ordering in probe()
74 * - DMA coherency rules by separate allocation of all buffers
75 * - use of endianness macros
76 * - abuse of spinlock, replaced by mutex
77 * - racy handling of timer in disconnect,
78 * replaced by delayed_work
79 * - racy interruptible_sleep_on(),
80 * replaced with wait_event_interruptible()
81 * - handle signals in read()
82 * 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net>
83 * Oliver Neukum <oliver@neukum.org>
84 * Version 1.0.7
85 * - usb autosuspend support
86 * - unplugging fixed
87 * 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net>
88 * Version 1.0.8
89 * - hardware frequency seek support
90 * - afc indication
91 * - more safety checks, let si470x_get_freq return errno
92 * - vidioc behavior corrected according to v4l2 spec
93 * 2008-10-20 Alexey Klimov <klimov.linux@gmail.com>
94 * - add support for KWorld USB FM Radio FM700
95 * - blacklisted KWorld radio in hid-core.c and hid-ids.h
96 * 2008-12-03 Mark Lord <mlord@pobox.com>
97 * - add support for DealExtreme USB Radio
98 * 2009-01-31 Bob Ross <pigiron@gmx.com>
99 * - correction of stereo detection/setting
100 * - correction of signal strength indicator scaling
101 * 2009-01-31 Rick Bronson <rick@efn.org>
102 * Tobias Lorenz <tobias.lorenz@gmx.net>
103 * - add LED status output
104 * - get HW/SW version from scratchpad
105 * 2009-06-16 Edouard Lafargue <edouard@lafargue.name>
106 * Version 1.0.10
107 * - add support for interrupt mode for RDS endpoint,
108 * instead of polling.
109 * Improves RDS reception significantly
110 */
111
112
113/* kernel includes */
114#include "radio-si470x.h"
115
116
117
118/**************************************************************************
119 * Module Parameters
120 **************************************************************************/
121
122/* Spacing (kHz) */
123/* 0: 200 kHz (USA, Australia) */
124/* 1: 100 kHz (Europe, Japan) */
125/* 2: 50 kHz */
126static unsigned short space = 2;
127module_param(space, ushort, 0444);
128MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
129
130/* Bottom of Band (MHz) */
131/* 0: 87.5 - 108 MHz (USA, Europe)*/
132/* 1: 76 - 108 MHz (Japan wide band) */
133/* 2: 76 - 90 MHz (Japan) */
134static unsigned short band = 1;
135module_param(band, ushort, 0444);
136MODULE_PARM_DESC(band, "Band: 0=87.5..108MHz *1=76..108MHz* 2=76..90MHz");
137
138/* De-emphasis */
139/* 0: 75 us (USA) */
140/* 1: 50 us (Europe, Australia, Japan) */
141static unsigned short de = 1;
142module_param(de, ushort, 0444);
143MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
144
145/* Tune timeout */
146static unsigned int tune_timeout = 3000;
147module_param(tune_timeout, uint, 0644);
148MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
149
150/* Seek timeout */
151static unsigned int seek_timeout = 5000;
152module_param(seek_timeout, uint, 0644);
153MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
154
155
156
157/**************************************************************************
158 * Generic Functions
159 **************************************************************************/
160
161/*
162 * si470x_set_chan - set the channel
163 */
164static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
165{
166 int retval;
167 unsigned long timeout;
168 bool timed_out = 0;
169
170 /* start tuning */
171 radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
172 radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
173 retval = si470x_set_register(radio, CHANNEL);
174 if (retval < 0)
175 goto done;
176
177 /* wait till tune operation has completed */
178 timeout = jiffies + msecs_to_jiffies(tune_timeout);
179 do {
180 retval = si470x_get_register(radio, STATUSRSSI);
181 if (retval < 0)
182 goto stop;
183 timed_out = time_after(jiffies, timeout);
184 } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
185 (!timed_out));
186 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
187 printk(KERN_WARNING DRIVER_NAME ": tune does not complete\n");
188 if (timed_out)
189 printk(KERN_WARNING DRIVER_NAME
190 ": tune timed out after %u ms\n", tune_timeout);
191
192stop:
193 /* stop tuning */
194 radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
195 retval = si470x_set_register(radio, CHANNEL);
196
197done:
198 return retval;
199}
200
201
202/*
203 * si470x_get_freq - get the frequency
204 */
205static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
206{
207 unsigned int spacing, band_bottom;
208 unsigned short chan;
209 int retval;
210
211 /* Spacing (kHz) */
212 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
213 /* 0: 200 kHz (USA, Australia) */
214 case 0:
215 spacing = 0.200 * FREQ_MUL; break;
216 /* 1: 100 kHz (Europe, Japan) */
217 case 1:
218 spacing = 0.100 * FREQ_MUL; break;
219 /* 2: 50 kHz */
220 default:
221 spacing = 0.050 * FREQ_MUL; break;
222 };
223
224 /* Bottom of Band (MHz) */
225 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
226 /* 0: 87.5 - 108 MHz (USA, Europe) */
227 case 0:
228 band_bottom = 87.5 * FREQ_MUL; break;
229 /* 1: 76 - 108 MHz (Japan wide band) */
230 default:
231 band_bottom = 76 * FREQ_MUL; break;
232 /* 2: 76 - 90 MHz (Japan) */
233 case 2:
234 band_bottom = 76 * FREQ_MUL; break;
235 };
236
237 /* read channel */
238 retval = si470x_get_register(radio, READCHAN);
239 chan = radio->registers[READCHAN] & READCHAN_READCHAN;
240
241 /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
242 *freq = chan * spacing + band_bottom;
243
244 return retval;
245}
246
247
248/*
249 * si470x_set_freq - set the frequency
250 */
251int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
252{
253 unsigned int spacing, band_bottom;
254 unsigned short chan;
255
256 /* Spacing (kHz) */
257 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
258 /* 0: 200 kHz (USA, Australia) */
259 case 0:
260 spacing = 0.200 * FREQ_MUL; break;
261 /* 1: 100 kHz (Europe, Japan) */
262 case 1:
263 spacing = 0.100 * FREQ_MUL; break;
264 /* 2: 50 kHz */
265 default:
266 spacing = 0.050 * FREQ_MUL; break;
267 };
268
269 /* Bottom of Band (MHz) */
270 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
271 /* 0: 87.5 - 108 MHz (USA, Europe) */
272 case 0:
273 band_bottom = 87.5 * FREQ_MUL; break;
274 /* 1: 76 - 108 MHz (Japan wide band) */
275 default:
276 band_bottom = 76 * FREQ_MUL; break;
277 /* 2: 76 - 90 MHz (Japan) */
278 case 2:
279 band_bottom = 76 * FREQ_MUL; break;
280 };
281
282 /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
283 chan = (freq - band_bottom) / spacing;
284
285 return si470x_set_chan(radio, chan);
286}
287
288
289/*
290 * si470x_set_seek - set seek
291 */
292static int si470x_set_seek(struct si470x_device *radio,
293 unsigned int wrap_around, unsigned int seek_upward)
294{
295 int retval = 0;
296 unsigned long timeout;
297 bool timed_out = 0;
298
299 /* start seeking */
300 radio->registers[POWERCFG] |= POWERCFG_SEEK;
301 if (wrap_around == 1)
302 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
303 else
304 radio->registers[POWERCFG] |= POWERCFG_SKMODE;
305 if (seek_upward == 1)
306 radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
307 else
308 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
309 retval = si470x_set_register(radio, POWERCFG);
310 if (retval < 0)
311 goto done;
312
313 /* wait till seek operation has completed */
314 timeout = jiffies + msecs_to_jiffies(seek_timeout);
315 do {
316 retval = si470x_get_register(radio, STATUSRSSI);
317 if (retval < 0)
318 goto stop;
319 timed_out = time_after(jiffies, timeout);
320 } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
321 (!timed_out));
322 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
323 printk(KERN_WARNING DRIVER_NAME ": seek does not complete\n");
324 if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
325 printk(KERN_WARNING DRIVER_NAME
326 ": seek failed / band limit reached\n");
327 if (timed_out)
328 printk(KERN_WARNING DRIVER_NAME
329 ": seek timed out after %u ms\n", seek_timeout);
330
331stop:
332 /* stop seeking */
333 radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
334 retval = si470x_set_register(radio, POWERCFG);
335
336done:
337 /* try again, if timed out */
338 if ((retval == 0) && timed_out)
339 retval = -EAGAIN;
340
341 return retval;
342}
343
344
345/*
346 * si470x_start - switch on radio
347 */
348int si470x_start(struct si470x_device *radio)
349{
350 int retval;
351
352 /* powercfg */
353 radio->registers[POWERCFG] =
354 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
355 retval = si470x_set_register(radio, POWERCFG);
356 if (retval < 0)
357 goto done;
358
359 /* sysconfig 1 */
360 radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
361 retval = si470x_set_register(radio, SYSCONFIG1);
362 if (retval < 0)
363 goto done;
364
365 /* sysconfig 2 */
366 radio->registers[SYSCONFIG2] =
367 (0x3f << 8) | /* SEEKTH */
368 ((band << 6) & SYSCONFIG2_BAND) | /* BAND */
369 ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
370 15; /* VOLUME (max) */
371 retval = si470x_set_register(radio, SYSCONFIG2);
372 if (retval < 0)
373 goto done;
374
375 /* reset last channel */
376 retval = si470x_set_chan(radio,
377 radio->registers[CHANNEL] & CHANNEL_CHAN);
378
379done:
380 return retval;
381}
382
383
384/*
385 * si470x_stop - switch off radio
386 */
387int si470x_stop(struct si470x_device *radio)
388{
389 int retval;
390
391 /* sysconfig 1 */
392 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
393 retval = si470x_set_register(radio, SYSCONFIG1);
394 if (retval < 0)
395 goto done;
396
397 /* powercfg */
398 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
399 /* POWERCFG_ENABLE has to automatically go low */
400 radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
401 retval = si470x_set_register(radio, POWERCFG);
402
403done:
404 return retval;
405}
406
407
408/*
409 * si470x_rds_on - switch on rds reception
410 */
411int si470x_rds_on(struct si470x_device *radio)
412{
413 int retval;
414
415 /* sysconfig 1 */
416 mutex_lock(&radio->lock);
417 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
418 retval = si470x_set_register(radio, SYSCONFIG1);
419 if (retval < 0)
420 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
421 mutex_unlock(&radio->lock);
422
423 return retval;
424}
425
426
427
428/**************************************************************************
429 * Video4Linux Interface
430 **************************************************************************/
431
432/*
433 * si470x_vidioc_queryctrl - enumerate control items
434 */
435static int si470x_vidioc_queryctrl(struct file *file, void *priv,
436 struct v4l2_queryctrl *qc)
437{
438 int retval = -EINVAL;
439
440 /* abort if qc->id is below V4L2_CID_BASE */
441 if (qc->id < V4L2_CID_BASE)
442 goto done;
443
444 /* search video control */
445 switch (qc->id) {
446 case V4L2_CID_AUDIO_VOLUME:
447 return v4l2_ctrl_query_fill(qc, 0, 15, 1, 15);
448 case V4L2_CID_AUDIO_MUTE:
449 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
450 }
451
452 /* disable unsupported base controls */
453 /* to satisfy kradio and such apps */
454 if ((retval == -EINVAL) && (qc->id < V4L2_CID_LASTP1)) {
455 qc->flags = V4L2_CTRL_FLAG_DISABLED;
456 retval = 0;
457 }
458
459done:
460 if (retval < 0)
461 printk(KERN_WARNING DRIVER_NAME
462 ": query controls failed with %d\n", retval);
463 return retval;
464}
465
466
467/*
468 * si470x_vidioc_g_ctrl - get the value of a control
469 */
470static int si470x_vidioc_g_ctrl(struct file *file, void *priv,
471 struct v4l2_control *ctrl)
472{
473 struct si470x_device *radio = video_drvdata(file);
474 int retval = 0;
475
476 /* safety checks */
477 if (radio->disconnected) {
478 retval = -EIO;
479 goto done;
480 }
481
482 switch (ctrl->id) {
483 case V4L2_CID_AUDIO_VOLUME:
484 ctrl->value = radio->registers[SYSCONFIG2] &
485 SYSCONFIG2_VOLUME;
486 break;
487 case V4L2_CID_AUDIO_MUTE:
488 ctrl->value = ((radio->registers[POWERCFG] &
489 POWERCFG_DMUTE) == 0) ? 1 : 0;
490 break;
491 default:
492 retval = -EINVAL;
493 }
494
495done:
496 if (retval < 0)
497 printk(KERN_WARNING DRIVER_NAME
498 ": get control failed with %d\n", retval);
499 return retval;
500}
501
502
503/*
504 * si470x_vidioc_s_ctrl - set the value of a control
505 */
506static int si470x_vidioc_s_ctrl(struct file *file, void *priv,
507 struct v4l2_control *ctrl)
508{
509 struct si470x_device *radio = video_drvdata(file);
510 int retval = 0;
511
512 /* safety checks */
513 if (radio->disconnected) {
514 retval = -EIO;
515 goto done;
516 }
517
518 switch (ctrl->id) {
519 case V4L2_CID_AUDIO_VOLUME:
520 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
521 radio->registers[SYSCONFIG2] |= ctrl->value;
522 retval = si470x_set_register(radio, SYSCONFIG2);
523 break;
524 case V4L2_CID_AUDIO_MUTE:
525 if (ctrl->value == 1)
526 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
527 else
528 radio->registers[POWERCFG] |= POWERCFG_DMUTE;
529 retval = si470x_set_register(radio, POWERCFG);
530 break;
531 default:
532 retval = -EINVAL;
533 }
534
535done:
536 if (retval < 0)
537 printk(KERN_WARNING DRIVER_NAME
538 ": set control failed with %d\n", retval);
539 return retval;
540}
541
542
543/*
544 * si470x_vidioc_g_audio - get audio attributes
545 */
546static int si470x_vidioc_g_audio(struct file *file, void *priv,
547 struct v4l2_audio *audio)
548{
549 /* driver constants */
550 audio->index = 0;
551 strcpy(audio->name, "Radio");
552 audio->capability = V4L2_AUDCAP_STEREO;
553 audio->mode = 0;
554
555 return 0;
556}
557
558
559/*
560 * si470x_vidioc_g_tuner - get tuner attributes
561 */
562static int si470x_vidioc_g_tuner(struct file *file, void *priv,
563 struct v4l2_tuner *tuner)
564{
565 struct si470x_device *radio = video_drvdata(file);
566 int retval = 0;
567
568 /* safety checks */
569 if (radio->disconnected) {
570 retval = -EIO;
571 goto done;
572 }
573 if (tuner->index != 0) {
574 retval = -EINVAL;
575 goto done;
576 }
577
578 retval = si470x_get_register(radio, STATUSRSSI);
579 if (retval < 0)
580 goto done;
581
582 /* driver constants */
583 strcpy(tuner->name, "FM");
584 tuner->type = V4L2_TUNER_RADIO;
585 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
586 V4L2_TUNER_CAP_RDS;
587
588 /* range limits */
589 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
590 /* 0: 87.5 - 108 MHz (USA, Europe, default) */
591 default:
592 tuner->rangelow = 87.5 * FREQ_MUL;
593 tuner->rangehigh = 108 * FREQ_MUL;
594 break;
595 /* 1: 76 - 108 MHz (Japan wide band) */
596 case 1:
597 tuner->rangelow = 76 * FREQ_MUL;
598 tuner->rangehigh = 108 * FREQ_MUL;
599 break;
600 /* 2: 76 - 90 MHz (Japan) */
601 case 2:
602 tuner->rangelow = 76 * FREQ_MUL;
603 tuner->rangehigh = 90 * FREQ_MUL;
604 break;
605 };
606
607 /* stereo indicator == stereo (instead of mono) */
608 if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
609 tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
610 else
611 tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
612 /* If there is a reliable method of detecting an RDS channel,
613 then this code should check for that before setting this
614 RDS subchannel. */
615 tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
616
617 /* mono/stereo selector */
618 if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
619 tuner->audmode = V4L2_TUNER_MODE_STEREO;
620 else
621 tuner->audmode = V4L2_TUNER_MODE_MONO;
622
623 /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
624 /* measured in units of db쨉V in 1 db increments (max at ~75 db쨉V) */
625 tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
626 /* the ideal factor is 0xffff/75 = 873,8 */
627 tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
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
633done:
634 if (retval < 0)
635 printk(KERN_WARNING DRIVER_NAME
636 ": get tuner failed with %d\n", retval);
637 return retval;
638}
639
640
641/*
642 * si470x_vidioc_s_tuner - set tuner attributes
643 */
644static int si470x_vidioc_s_tuner(struct file *file, void *priv,
645 struct v4l2_tuner *tuner)
646{
647 struct si470x_device *radio = video_drvdata(file);
648 int retval = -EINVAL;
649
650 /* safety checks */
651 if (radio->disconnected) {
652 retval = -EIO;
653 goto done;
654 }
655 if (tuner->index != 0)
656 goto done;
657
658 /* mono/stereo selector */
659 switch (tuner->audmode) {
660 case V4L2_TUNER_MODE_MONO:
661 radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */
662 break;
663 case V4L2_TUNER_MODE_STEREO:
664 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
665 break;
666 default:
667 goto done;
668 }
669
670 retval = si470x_set_register(radio, POWERCFG);
671
672done:
673 if (retval < 0)
674 printk(KERN_WARNING DRIVER_NAME
675 ": set tuner failed with %d\n", retval);
676 return retval;
677}
678
679
680/*
681 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
682 */
683static int si470x_vidioc_g_frequency(struct file *file, void *priv,
684 struct v4l2_frequency *freq)
685{
686 struct si470x_device *radio = video_drvdata(file);
687 int retval = 0;
688
689 /* safety checks */
690 if (radio->disconnected) {
691 retval = -EIO;
692 goto done;
693 }
694 if (freq->tuner != 0) {
695 retval = -EINVAL;
696 goto done;
697 }
698
699 freq->type = V4L2_TUNER_RADIO;
700 retval = si470x_get_freq(radio, &freq->frequency);
701
702done:
703 if (retval < 0)
704 printk(KERN_WARNING DRIVER_NAME
705 ": get frequency failed with %d\n", retval);
706 return retval;
707}
708
709
710/*
711 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
712 */
713static int si470x_vidioc_s_frequency(struct file *file, void *priv,
714 struct v4l2_frequency *freq)
715{
716 struct si470x_device *radio = video_drvdata(file);
717 int retval = 0;
718
719 /* safety checks */
720 if (radio->disconnected) {
721 retval = -EIO;
722 goto done;
723 }
724 if (freq->tuner != 0) {
725 retval = -EINVAL;
726 goto done;
727 }
728
729 retval = si470x_set_freq(radio, freq->frequency);
730
731done:
732 if (retval < 0)
733 printk(KERN_WARNING DRIVER_NAME
734 ": set frequency failed with %d\n", retval);
735 return retval;
736}
737
738
739/*
740 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
741 */
742static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
743 struct v4l2_hw_freq_seek *seek)
744{
745 struct si470x_device *radio = video_drvdata(file);
746 int retval = 0;
747
748 /* safety checks */
749 if (radio->disconnected) {
750 retval = -EIO;
751 goto done;
752 }
753 if (seek->tuner != 0) {
754 retval = -EINVAL;
755 goto done;
756 }
757
758 retval = si470x_set_seek(radio, seek->wrap_around, seek->seek_upward);
759
760done:
761 if (retval < 0)
762 printk(KERN_WARNING DRIVER_NAME
763 ": set hardware frequency seek failed with %d\n",
764 retval);
765 return retval;
766}
767
768
769/*
770 * si470x_ioctl_ops - video device ioctl operations
771 */
772static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
773 .vidioc_querycap = si470x_vidioc_querycap,
774 .vidioc_queryctrl = si470x_vidioc_queryctrl,
775 .vidioc_g_ctrl = si470x_vidioc_g_ctrl,
776 .vidioc_s_ctrl = si470x_vidioc_s_ctrl,
777 .vidioc_g_audio = si470x_vidioc_g_audio,
778 .vidioc_g_tuner = si470x_vidioc_g_tuner,
779 .vidioc_s_tuner = si470x_vidioc_s_tuner,
780 .vidioc_g_frequency = si470x_vidioc_g_frequency,
781 .vidioc_s_frequency = si470x_vidioc_s_frequency,
782 .vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek,
783};
784
785
786/*
787 * si470x_viddev_template - video device interface
788 */
789struct video_device si470x_viddev_template = {
790 .fops = &si470x_fops,
791 .name = DRIVER_NAME,
792 .release = video_device_release,
793 .ioctl_ops = &si470x_ioctl_ops,
794};
diff --git a/drivers/media/radio/si470x/radio-si470x-usb.c b/drivers/media/radio/si470x/radio-si470x-usb.c
new file mode 100644
index 000000000000..f3d805f70996
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x-usb.c
@@ -0,0 +1,958 @@
1/*
2 * drivers/media/radio/si470x/radio-si470x-usb.c
3 *
4 * USB driver for radios with Silicon Labs Si470x FM Radio Receivers
5 *
6 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24/*
25 * ToDo:
26 * - add firmware download/update support
27 */
28
29
30/* driver definitions */
31#define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
32#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 10)
33#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
34#define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
35#define DRIVER_VERSION "1.0.10"
36
37/* kernel includes */
38#include <linux/usb.h>
39#include <linux/hid.h>
40
41#include "radio-si470x.h"
42
43
44/* USB Device ID List */
45static struct usb_device_id si470x_usb_driver_id_table[] = {
46 /* Silicon Labs USB FM Radio Reference Design */
47 { USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
48 /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
49 { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
50 /* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
51 { USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
52 /* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
53 { USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
54 /* Terminating entry */
55 { }
56};
57MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
58
59
60
61/**************************************************************************
62 * Module Parameters
63 **************************************************************************/
64
65/* Radio Nr */
66static int radio_nr = -1;
67module_param(radio_nr, int, 0444);
68MODULE_PARM_DESC(radio_nr, "Radio Nr");
69
70/* USB timeout */
71static unsigned int usb_timeout = 500;
72module_param(usb_timeout, uint, 0644);
73MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
74
75/* RDS buffer blocks */
76static unsigned int rds_buf = 100;
77module_param(rds_buf, uint, 0444);
78MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
79
80/* RDS maximum block errors */
81static unsigned short max_rds_errors = 1;
82/* 0 means 0 errors requiring correction */
83/* 1 means 1-2 errors requiring correction (used by original USBRadio.exe) */
84/* 2 means 3-5 errors requiring correction */
85/* 3 means 6+ errors or errors in checkword, correction not possible */
86module_param(max_rds_errors, ushort, 0644);
87MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
88
89
90
91/**************************************************************************
92 * USB HID Reports
93 **************************************************************************/
94
95/* Reports 1-16 give direct read/write access to the 16 Si470x registers */
96/* with the (REPORT_ID - 1) corresponding to the register address across USB */
97/* endpoint 0 using GET_REPORT and SET_REPORT */
98#define REGISTER_REPORT_SIZE (RADIO_REGISTER_SIZE + 1)
99#define REGISTER_REPORT(reg) ((reg) + 1)
100
101/* Report 17 gives direct read/write access to the entire Si470x register */
102/* map across endpoint 0 using GET_REPORT and SET_REPORT */
103#define ENTIRE_REPORT_SIZE (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
104#define ENTIRE_REPORT 17
105
106/* Report 18 is used to send the lowest 6 Si470x registers up the HID */
107/* interrupt endpoint 1 to Windows every 20 milliseconds for status */
108#define RDS_REPORT_SIZE (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
109#define RDS_REPORT 18
110
111/* Report 19: LED state */
112#define LED_REPORT_SIZE 3
113#define LED_REPORT 19
114
115/* Report 19: stream */
116#define STREAM_REPORT_SIZE 3
117#define STREAM_REPORT 19
118
119/* Report 20: scratch */
120#define SCRATCH_PAGE_SIZE 63
121#define SCRATCH_REPORT_SIZE (SCRATCH_PAGE_SIZE + 1)
122#define SCRATCH_REPORT 20
123
124/* Reports 19-22: flash upgrade of the C8051F321 */
125#define WRITE_REPORT_SIZE 4
126#define WRITE_REPORT 19
127#define FLASH_REPORT_SIZE 64
128#define FLASH_REPORT 20
129#define CRC_REPORT_SIZE 3
130#define CRC_REPORT 21
131#define RESPONSE_REPORT_SIZE 2
132#define RESPONSE_REPORT 22
133
134/* Report 23: currently unused, but can accept 60 byte reports on the HID */
135/* interrupt out endpoint 2 every 1 millisecond */
136#define UNUSED_REPORT 23
137
138
139
140/**************************************************************************
141 * Software/Hardware Versions
142 **************************************************************************/
143#define RADIO_SW_VERSION_NOT_BOOTLOADABLE 6
144#define RADIO_SW_VERSION 7
145#define RADIO_SW_VERSION_CURRENT 15
146#define RADIO_HW_VERSION 1
147
148#define SCRATCH_PAGE_SW_VERSION 1
149#define SCRATCH_PAGE_HW_VERSION 2
150
151
152
153/**************************************************************************
154 * LED State Definitions
155 **************************************************************************/
156#define LED_COMMAND 0x35
157
158#define NO_CHANGE_LED 0x00
159#define ALL_COLOR_LED 0x01 /* streaming state */
160#define BLINK_GREEN_LED 0x02 /* connect state */
161#define BLINK_RED_LED 0x04
162#define BLINK_ORANGE_LED 0x10 /* disconnect state */
163#define SOLID_GREEN_LED 0x20 /* tuning/seeking state */
164#define SOLID_RED_LED 0x40 /* bootload state */
165#define SOLID_ORANGE_LED 0x80
166
167
168
169/**************************************************************************
170 * Stream State Definitions
171 **************************************************************************/
172#define STREAM_COMMAND 0x36
173#define STREAM_VIDPID 0x00
174#define STREAM_AUDIO 0xff
175
176
177
178/**************************************************************************
179 * Bootloader / Flash Commands
180 **************************************************************************/
181
182/* unique id sent to bootloader and required to put into a bootload state */
183#define UNIQUE_BL_ID 0x34
184
185/* mask for the flash data */
186#define FLASH_DATA_MASK 0x55
187
188/* bootloader commands */
189#define GET_SW_VERSION_COMMAND 0x00
190#define SET_PAGE_COMMAND 0x01
191#define ERASE_PAGE_COMMAND 0x02
192#define WRITE_PAGE_COMMAND 0x03
193#define CRC_ON_PAGE_COMMAND 0x04
194#define READ_FLASH_BYTE_COMMAND 0x05
195#define RESET_DEVICE_COMMAND 0x06
196#define GET_HW_VERSION_COMMAND 0x07
197#define BLANK 0xff
198
199/* bootloader command responses */
200#define COMMAND_OK 0x01
201#define COMMAND_FAILED 0x02
202#define COMMAND_PENDING 0x03
203
204
205
206/**************************************************************************
207 * General Driver Functions - REGISTER_REPORTs
208 **************************************************************************/
209
210/*
211 * si470x_get_report - receive a HID report
212 */
213static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
214{
215 unsigned char *report = (unsigned char *) buf;
216 int retval;
217
218 retval = usb_control_msg(radio->usbdev,
219 usb_rcvctrlpipe(radio->usbdev, 0),
220 HID_REQ_GET_REPORT,
221 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
222 report[0], 2,
223 buf, size, usb_timeout);
224
225 if (retval < 0)
226 printk(KERN_WARNING DRIVER_NAME
227 ": si470x_get_report: usb_control_msg returned %d\n",
228 retval);
229 return retval;
230}
231
232
233/*
234 * si470x_set_report - send a HID report
235 */
236static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
237{
238 unsigned char *report = (unsigned char *) buf;
239 int retval;
240
241 retval = usb_control_msg(radio->usbdev,
242 usb_sndctrlpipe(radio->usbdev, 0),
243 HID_REQ_SET_REPORT,
244 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
245 report[0], 2,
246 buf, size, usb_timeout);
247
248 if (retval < 0)
249 printk(KERN_WARNING DRIVER_NAME
250 ": si470x_set_report: usb_control_msg returned %d\n",
251 retval);
252 return retval;
253}
254
255
256/*
257 * si470x_get_register - read register
258 */
259int si470x_get_register(struct si470x_device *radio, int regnr)
260{
261 unsigned char buf[REGISTER_REPORT_SIZE];
262 int retval;
263
264 buf[0] = REGISTER_REPORT(regnr);
265
266 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
267
268 if (retval >= 0)
269 radio->registers[regnr] = get_unaligned_be16(&buf[1]);
270
271 return (retval < 0) ? -EINVAL : 0;
272}
273
274
275/*
276 * si470x_set_register - write register
277 */
278int si470x_set_register(struct si470x_device *radio, int regnr)
279{
280 unsigned char buf[REGISTER_REPORT_SIZE];
281 int retval;
282
283 buf[0] = REGISTER_REPORT(regnr);
284 put_unaligned_be16(radio->registers[regnr], &buf[1]);
285
286 retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
287
288 return (retval < 0) ? -EINVAL : 0;
289}
290
291
292
293/**************************************************************************
294 * General Driver Functions - ENTIRE_REPORT
295 **************************************************************************/
296
297/*
298 * si470x_get_all_registers - read entire registers
299 */
300static int si470x_get_all_registers(struct si470x_device *radio)
301{
302 unsigned char buf[ENTIRE_REPORT_SIZE];
303 int retval;
304 unsigned char regnr;
305
306 buf[0] = ENTIRE_REPORT;
307
308 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
309
310 if (retval >= 0)
311 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
312 radio->registers[regnr] = get_unaligned_be16(
313 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
314
315 return (retval < 0) ? -EINVAL : 0;
316}
317
318
319
320/**************************************************************************
321 * General Driver Functions - LED_REPORT
322 **************************************************************************/
323
324/*
325 * si470x_set_led_state - sets the led state
326 */
327static int si470x_set_led_state(struct si470x_device *radio,
328 unsigned char led_state)
329{
330 unsigned char buf[LED_REPORT_SIZE];
331 int retval;
332
333 buf[0] = LED_REPORT;
334 buf[1] = LED_COMMAND;
335 buf[2] = led_state;
336
337 retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
338
339 return (retval < 0) ? -EINVAL : 0;
340}
341
342
343
344/**************************************************************************
345 * General Driver Functions - SCRATCH_REPORT
346 **************************************************************************/
347
348/*
349 * si470x_get_scratch_versions - gets the scratch page and version infos
350 */
351static int si470x_get_scratch_page_versions(struct si470x_device *radio)
352{
353 unsigned char buf[SCRATCH_REPORT_SIZE];
354 int retval;
355
356 buf[0] = SCRATCH_REPORT;
357
358 retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
359
360 if (retval < 0)
361 printk(KERN_WARNING DRIVER_NAME ": si470x_get_scratch: "
362 "si470x_get_report returned %d\n", retval);
363 else {
364 radio->software_version = buf[1];
365 radio->hardware_version = buf[2];
366 }
367
368 return (retval < 0) ? -EINVAL : 0;
369}
370
371
372
373/**************************************************************************
374 * RDS Driver Functions
375 **************************************************************************/
376
377/*
378 * si470x_int_in_callback - rds callback and processing function
379 *
380 * TODO: do we need to use mutex locks in some sections?
381 */
382static void si470x_int_in_callback(struct urb *urb)
383{
384 struct si470x_device *radio = urb->context;
385 unsigned char buf[RDS_REPORT_SIZE];
386 int retval;
387 unsigned char regnr;
388 unsigned char blocknum;
389 unsigned short bler; /* rds block errors */
390 unsigned short rds;
391 unsigned char tmpbuf[3];
392
393 if (urb->status) {
394 if (urb->status == -ENOENT ||
395 urb->status == -ECONNRESET ||
396 urb->status == -ESHUTDOWN) {
397 return;
398 } else {
399 printk(KERN_WARNING DRIVER_NAME
400 ": non-zero urb status (%d)\n", urb->status);
401 goto resubmit; /* Maybe we can recover. */
402 }
403 }
404
405 /* safety checks */
406 if (radio->disconnected)
407 return;
408 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
409 goto resubmit;
410
411 if (urb->actual_length > 0) {
412 /* Update RDS registers with URB data */
413 buf[0] = RDS_REPORT;
414 for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
415 radio->registers[STATUSRSSI + regnr] =
416 get_unaligned_be16(&radio->int_in_buffer[
417 regnr * RADIO_REGISTER_SIZE + 1]);
418 /* get rds blocks */
419 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
420 /* No RDS group ready, better luck next time */
421 goto resubmit;
422 }
423 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
424 /* RDS decoder not synchronized */
425 goto resubmit;
426 }
427 for (blocknum = 0; blocknum < 4; blocknum++) {
428 switch (blocknum) {
429 default:
430 bler = (radio->registers[STATUSRSSI] &
431 STATUSRSSI_BLERA) >> 9;
432 rds = radio->registers[RDSA];
433 break;
434 case 1:
435 bler = (radio->registers[READCHAN] &
436 READCHAN_BLERB) >> 14;
437 rds = radio->registers[RDSB];
438 break;
439 case 2:
440 bler = (radio->registers[READCHAN] &
441 READCHAN_BLERC) >> 12;
442 rds = radio->registers[RDSC];
443 break;
444 case 3:
445 bler = (radio->registers[READCHAN] &
446 READCHAN_BLERD) >> 10;
447 rds = radio->registers[RDSD];
448 break;
449 };
450
451 /* Fill the V4L2 RDS buffer */
452 put_unaligned_le16(rds, &tmpbuf);
453 tmpbuf[2] = blocknum; /* offset name */
454 tmpbuf[2] |= blocknum << 3; /* received offset */
455 if (bler > max_rds_errors)
456 tmpbuf[2] |= 0x80; /* uncorrectable errors */
457 else if (bler > 0)
458 tmpbuf[2] |= 0x40; /* corrected error(s) */
459
460 /* copy RDS block to internal buffer */
461 memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
462 radio->wr_index += 3;
463
464 /* wrap write pointer */
465 if (radio->wr_index >= radio->buf_size)
466 radio->wr_index = 0;
467
468 /* check for overflow */
469 if (radio->wr_index == radio->rd_index) {
470 /* increment and wrap read pointer */
471 radio->rd_index += 3;
472 if (radio->rd_index >= radio->buf_size)
473 radio->rd_index = 0;
474 }
475 }
476 if (radio->wr_index != radio->rd_index)
477 wake_up_interruptible(&radio->read_queue);
478 }
479
480resubmit:
481 /* Resubmit if we're still running. */
482 if (radio->int_in_running && radio->usbdev) {
483 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
484 if (retval) {
485 printk(KERN_WARNING DRIVER_NAME
486 ": resubmitting urb failed (%d)", retval);
487 radio->int_in_running = 0;
488 }
489 }
490}
491
492
493
494/**************************************************************************
495 * File Operations Interface
496 **************************************************************************/
497
498/*
499 * si470x_fops_read - read RDS data
500 */
501static ssize_t si470x_fops_read(struct file *file, char __user *buf,
502 size_t count, loff_t *ppos)
503{
504 struct si470x_device *radio = video_drvdata(file);
505 int retval = 0;
506 unsigned int block_count = 0;
507
508 /* switch on rds reception */
509 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
510 si470x_rds_on(radio);
511
512 /* block if no new data available */
513 while (radio->wr_index == radio->rd_index) {
514 if (file->f_flags & O_NONBLOCK) {
515 retval = -EWOULDBLOCK;
516 goto done;
517 }
518 if (wait_event_interruptible(radio->read_queue,
519 radio->wr_index != radio->rd_index) < 0) {
520 retval = -EINTR;
521 goto done;
522 }
523 }
524
525 /* calculate block count from byte count */
526 count /= 3;
527
528 /* copy RDS block out of internal buffer and to user buffer */
529 mutex_lock(&radio->lock);
530 while (block_count < count) {
531 if (radio->rd_index == radio->wr_index)
532 break;
533
534 /* always transfer rds complete blocks */
535 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
536 /* retval = -EFAULT; */
537 break;
538
539 /* increment and wrap read pointer */
540 radio->rd_index += 3;
541 if (radio->rd_index >= radio->buf_size)
542 radio->rd_index = 0;
543
544 /* increment counters */
545 block_count++;
546 buf += 3;
547 retval += 3;
548 }
549 mutex_unlock(&radio->lock);
550
551done:
552 return retval;
553}
554
555
556/*
557 * si470x_fops_poll - poll RDS data
558 */
559static unsigned int si470x_fops_poll(struct file *file,
560 struct poll_table_struct *pts)
561{
562 struct si470x_device *radio = video_drvdata(file);
563 int retval = 0;
564
565 /* switch on rds reception */
566 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
567 si470x_rds_on(radio);
568
569 poll_wait(file, &radio->read_queue, pts);
570
571 if (radio->rd_index != radio->wr_index)
572 retval = POLLIN | POLLRDNORM;
573
574 return retval;
575}
576
577
578/*
579 * si470x_fops_open - file open
580 */
581static int si470x_fops_open(struct file *file)
582{
583 struct si470x_device *radio = video_drvdata(file);
584 int retval;
585
586 lock_kernel();
587 radio->users++;
588
589 retval = usb_autopm_get_interface(radio->intf);
590 if (retval < 0) {
591 radio->users--;
592 retval = -EIO;
593 goto done;
594 }
595
596 if (radio->users == 1) {
597 /* start radio */
598 retval = si470x_start(radio);
599 if (retval < 0) {
600 usb_autopm_put_interface(radio->intf);
601 goto done;
602 }
603
604 /* initialize interrupt urb */
605 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
606 usb_rcvintpipe(radio->usbdev,
607 radio->int_in_endpoint->bEndpointAddress),
608 radio->int_in_buffer,
609 le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
610 si470x_int_in_callback,
611 radio,
612 radio->int_in_endpoint->bInterval);
613
614 radio->int_in_running = 1;
615 mb();
616
617 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
618 if (retval) {
619 printk(KERN_INFO DRIVER_NAME
620 ": submitting int urb failed (%d)\n", retval);
621 radio->int_in_running = 0;
622 usb_autopm_put_interface(radio->intf);
623 }
624 }
625
626done:
627 unlock_kernel();
628 return retval;
629}
630
631
632/*
633 * si470x_fops_release - file release
634 */
635static int si470x_fops_release(struct file *file)
636{
637 struct si470x_device *radio = video_drvdata(file);
638 int retval = 0;
639
640 /* safety check */
641 if (!radio) {
642 retval = -ENODEV;
643 goto done;
644 }
645
646 mutex_lock(&radio->disconnect_lock);
647 radio->users--;
648 if (radio->users == 0) {
649 /* shutdown interrupt handler */
650 if (radio->int_in_running) {
651 radio->int_in_running = 0;
652 if (radio->int_in_urb)
653 usb_kill_urb(radio->int_in_urb);
654 }
655
656 if (radio->disconnected) {
657 video_unregister_device(radio->videodev);
658 kfree(radio->int_in_buffer);
659 kfree(radio->buffer);
660 kfree(radio);
661 goto unlock;
662 }
663
664 /* cancel read processes */
665 wake_up_interruptible(&radio->read_queue);
666
667 /* stop radio */
668 retval = si470x_stop(radio);
669 usb_autopm_put_interface(radio->intf);
670 }
671unlock:
672 mutex_unlock(&radio->disconnect_lock);
673done:
674 return retval;
675}
676
677
678/*
679 * si470x_fops - file operations interface
680 */
681const struct v4l2_file_operations si470x_fops = {
682 .owner = THIS_MODULE,
683 .read = si470x_fops_read,
684 .poll = si470x_fops_poll,
685 .ioctl = video_ioctl2,
686 .open = si470x_fops_open,
687 .release = si470x_fops_release,
688};
689
690
691
692/**************************************************************************
693 * Video4Linux Interface
694 **************************************************************************/
695
696/*
697 * si470x_vidioc_querycap - query device capabilities
698 */
699int si470x_vidioc_querycap(struct file *file, void *priv,
700 struct v4l2_capability *capability)
701{
702 struct si470x_device *radio = video_drvdata(file);
703
704 strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
705 strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
706 usb_make_path(radio->usbdev, capability->bus_info,
707 sizeof(capability->bus_info));
708 capability->version = DRIVER_KERNEL_VERSION;
709 capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
710 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
711
712 return 0;
713}
714
715
716
717/**************************************************************************
718 * USB Interface
719 **************************************************************************/
720
721/*
722 * si470x_usb_driver_probe - probe for the device
723 */
724static int si470x_usb_driver_probe(struct usb_interface *intf,
725 const struct usb_device_id *id)
726{
727 struct si470x_device *radio;
728 struct usb_host_interface *iface_desc;
729 struct usb_endpoint_descriptor *endpoint;
730 int i, int_end_size, retval = 0;
731
732 /* private data allocation and initialization */
733 radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
734 if (!radio) {
735 retval = -ENOMEM;
736 goto err_initial;
737 }
738 radio->users = 0;
739 radio->disconnected = 0;
740 radio->usbdev = interface_to_usbdev(intf);
741 radio->intf = intf;
742 mutex_init(&radio->disconnect_lock);
743 mutex_init(&radio->lock);
744
745 iface_desc = intf->cur_altsetting;
746
747 /* Set up interrupt endpoint information. */
748 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
749 endpoint = &iface_desc->endpoint[i].desc;
750 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
751 USB_DIR_IN) && ((endpoint->bmAttributes &
752 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
753 radio->int_in_endpoint = endpoint;
754 }
755 if (!radio->int_in_endpoint) {
756 printk(KERN_INFO DRIVER_NAME
757 ": could not find interrupt in endpoint\n");
758 retval = -EIO;
759 goto err_radio;
760 }
761
762 int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
763
764 radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
765 if (!radio->int_in_buffer) {
766 printk(KERN_INFO DRIVER_NAME
767 "could not allocate int_in_buffer");
768 retval = -ENOMEM;
769 goto err_radio;
770 }
771
772 radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
773 if (!radio->int_in_urb) {
774 printk(KERN_INFO DRIVER_NAME "could not allocate int_in_urb");
775 retval = -ENOMEM;
776 goto err_intbuffer;
777 }
778
779 /* video device allocation and initialization */
780 radio->videodev = video_device_alloc();
781 if (!radio->videodev) {
782 retval = -ENOMEM;
783 goto err_intbuffer;
784 }
785 memcpy(radio->videodev, &si470x_viddev_template,
786 sizeof(si470x_viddev_template));
787 video_set_drvdata(radio->videodev, radio);
788
789 /* show some infos about the specific si470x device */
790 if (si470x_get_all_registers(radio) < 0) {
791 retval = -EIO;
792 goto err_video;
793 }
794 printk(KERN_INFO DRIVER_NAME ": DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
795 radio->registers[DEVICEID], radio->registers[CHIPID]);
796
797 /* get software and hardware versions */
798 if (si470x_get_scratch_page_versions(radio) < 0) {
799 retval = -EIO;
800 goto err_video;
801 }
802 printk(KERN_INFO DRIVER_NAME
803 ": software version %d, hardware version %d\n",
804 radio->software_version, radio->hardware_version);
805
806 /* check if device and firmware is current */
807 if ((radio->registers[CHIPID] & CHIPID_FIRMWARE)
808 < RADIO_SW_VERSION_CURRENT) {
809 printk(KERN_WARNING DRIVER_NAME
810 ": This driver is known to work with "
811 "firmware version %hu,\n", RADIO_SW_VERSION_CURRENT);
812 printk(KERN_WARNING DRIVER_NAME
813 ": but the device has firmware version %hu.\n",
814 radio->registers[CHIPID] & CHIPID_FIRMWARE);
815 printk(KERN_WARNING DRIVER_NAME
816 ": If you have some trouble using this driver,\n");
817 printk(KERN_WARNING DRIVER_NAME
818 ": please report to V4L ML at "
819 "linux-media@vger.kernel.org\n");
820 }
821
822 /* set initial frequency */
823 si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
824
825 /* set led to connect state */
826 si470x_set_led_state(radio, BLINK_GREEN_LED);
827
828 /* rds buffer allocation */
829 radio->buf_size = rds_buf * 3;
830 radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
831 if (!radio->buffer) {
832 retval = -EIO;
833 goto err_video;
834 }
835
836 /* rds buffer configuration */
837 radio->wr_index = 0;
838 radio->rd_index = 0;
839 init_waitqueue_head(&radio->read_queue);
840
841 /* register video device */
842 retval = video_register_device(radio->videodev, VFL_TYPE_RADIO,
843 radio_nr);
844 if (retval) {
845 printk(KERN_WARNING DRIVER_NAME
846 ": Could not register video device\n");
847 goto err_all;
848 }
849 usb_set_intfdata(intf, radio);
850
851 return 0;
852err_all:
853 kfree(radio->buffer);
854err_video:
855 video_device_release(radio->videodev);
856err_intbuffer:
857 kfree(radio->int_in_buffer);
858err_radio:
859 kfree(radio);
860err_initial:
861 return retval;
862}
863
864
865/*
866 * si470x_usb_driver_suspend - suspend the device
867 */
868static int si470x_usb_driver_suspend(struct usb_interface *intf,
869 pm_message_t message)
870{
871 printk(KERN_INFO DRIVER_NAME ": suspending now...\n");
872
873 return 0;
874}
875
876
877/*
878 * si470x_usb_driver_resume - resume the device
879 */
880static int si470x_usb_driver_resume(struct usb_interface *intf)
881{
882 printk(KERN_INFO DRIVER_NAME ": resuming now...\n");
883
884 return 0;
885}
886
887
888/*
889 * si470x_usb_driver_disconnect - disconnect the device
890 */
891static void si470x_usb_driver_disconnect(struct usb_interface *intf)
892{
893 struct si470x_device *radio = usb_get_intfdata(intf);
894
895 mutex_lock(&radio->disconnect_lock);
896 radio->disconnected = 1;
897 usb_set_intfdata(intf, NULL);
898 if (radio->users == 0) {
899 /* set led to disconnect state */
900 si470x_set_led_state(radio, BLINK_ORANGE_LED);
901
902 /* Free data structures. */
903 usb_free_urb(radio->int_in_urb);
904
905 kfree(radio->int_in_buffer);
906 video_unregister_device(radio->videodev);
907 kfree(radio->buffer);
908 kfree(radio);
909 }
910 mutex_unlock(&radio->disconnect_lock);
911}
912
913
914/*
915 * si470x_usb_driver - usb driver interface
916 */
917static struct usb_driver si470x_usb_driver = {
918 .name = DRIVER_NAME,
919 .probe = si470x_usb_driver_probe,
920 .disconnect = si470x_usb_driver_disconnect,
921 .suspend = si470x_usb_driver_suspend,
922 .resume = si470x_usb_driver_resume,
923 .id_table = si470x_usb_driver_id_table,
924 .supports_autosuspend = 1,
925};
926
927
928
929/**************************************************************************
930 * Module Interface
931 **************************************************************************/
932
933/*
934 * si470x_module_init - module init
935 */
936static int __init si470x_module_init(void)
937{
938 printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\n");
939 return usb_register(&si470x_usb_driver);
940}
941
942
943/*
944 * si470x_module_exit - module exit
945 */
946static void __exit si470x_module_exit(void)
947{
948 usb_deregister(&si470x_usb_driver);
949}
950
951
952module_init(si470x_module_init);
953module_exit(si470x_module_exit);
954
955MODULE_LICENSE("GPL");
956MODULE_AUTHOR(DRIVER_AUTHOR);
957MODULE_DESCRIPTION(DRIVER_DESC);
958MODULE_VERSION(DRIVER_VERSION);
diff --git a/drivers/media/radio/si470x/radio-si470x.h b/drivers/media/radio/si470x/radio-si470x.h
new file mode 100644
index 000000000000..dd71985c4113
--- /dev/null
+++ b/drivers/media/radio/si470x/radio-si470x.h
@@ -0,0 +1,201 @@
1/*
2 * drivers/media/radio/si470x/radio-si470x.h
3 *
4 * Driver for radios with Silicon Labs Si470x FM Radio Receivers
5 *
6 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24/* driver definitions */
25#define DRIVER_NAME "radio-si470x"
26
27
28/* kernel includes */
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/slab.h>
33#include <linux/smp_lock.h>
34#include <linux/input.h>
35#include <linux/version.h>
36#include <linux/videodev2.h>
37#include <linux/mutex.h>
38#include <media/v4l2-common.h>
39#include <media/v4l2-ioctl.h>
40#include <media/rds.h>
41#include <asm/unaligned.h>
42
43
44/**************************************************************************
45 * Register Definitions
46 **************************************************************************/
47#define RADIO_REGISTER_SIZE 2 /* 16 register bit width */
48#define RADIO_REGISTER_NUM 16 /* DEVICEID ... RDSD */
49#define RDS_REGISTER_NUM 6 /* STATUSRSSI ... RDSD */
50
51#define DEVICEID 0 /* Device ID */
52#define DEVICEID_PN 0xf000 /* bits 15..12: Part Number */
53#define DEVICEID_MFGID 0x0fff /* bits 11..00: Manufacturer ID */
54
55#define CHIPID 1 /* Chip ID */
56#define CHIPID_REV 0xfc00 /* bits 15..10: Chip Version */
57#define CHIPID_DEV 0x0200 /* bits 09..09: Device */
58#define CHIPID_FIRMWARE 0x01ff /* bits 08..00: Firmware Version */
59
60#define POWERCFG 2 /* Power Configuration */
61#define POWERCFG_DSMUTE 0x8000 /* bits 15..15: Softmute Disable */
62#define POWERCFG_DMUTE 0x4000 /* bits 14..14: Mute Disable */
63#define POWERCFG_MONO 0x2000 /* bits 13..13: Mono Select */
64#define POWERCFG_RDSM 0x0800 /* bits 11..11: RDS Mode (Si4701 only) */
65#define POWERCFG_SKMODE 0x0400 /* bits 10..10: Seek Mode */
66#define POWERCFG_SEEKUP 0x0200 /* bits 09..09: Seek Direction */
67#define POWERCFG_SEEK 0x0100 /* bits 08..08: Seek */
68#define POWERCFG_DISABLE 0x0040 /* bits 06..06: Powerup Disable */
69#define POWERCFG_ENABLE 0x0001 /* bits 00..00: Powerup Enable */
70
71#define CHANNEL 3 /* Channel */
72#define CHANNEL_TUNE 0x8000 /* bits 15..15: Tune */
73#define CHANNEL_CHAN 0x03ff /* bits 09..00: Channel Select */
74
75#define SYSCONFIG1 4 /* System Configuration 1 */
76#define SYSCONFIG1_RDSIEN 0x8000 /* bits 15..15: RDS Interrupt Enable (Si4701 only) */
77#define SYSCONFIG1_STCIEN 0x4000 /* bits 14..14: Seek/Tune Complete Interrupt Enable */
78#define SYSCONFIG1_RDS 0x1000 /* bits 12..12: RDS Enable (Si4701 only) */
79#define SYSCONFIG1_DE 0x0800 /* bits 11..11: De-emphasis (0=75us 1=50us) */
80#define SYSCONFIG1_AGCD 0x0400 /* bits 10..10: AGC Disable */
81#define SYSCONFIG1_BLNDADJ 0x00c0 /* bits 07..06: Stereo/Mono Blend Level Adjustment */
82#define SYSCONFIG1_GPIO3 0x0030 /* bits 05..04: General Purpose I/O 3 */
83#define SYSCONFIG1_GPIO2 0x000c /* bits 03..02: General Purpose I/O 2 */
84#define SYSCONFIG1_GPIO1 0x0003 /* bits 01..00: General Purpose I/O 1 */
85
86#define SYSCONFIG2 5 /* System Configuration 2 */
87#define SYSCONFIG2_SEEKTH 0xff00 /* bits 15..08: RSSI Seek Threshold */
88#define SYSCONFIG2_BAND 0x0080 /* bits 07..06: Band Select */
89#define SYSCONFIG2_SPACE 0x0030 /* bits 05..04: Channel Spacing */
90#define SYSCONFIG2_VOLUME 0x000f /* bits 03..00: Volume */
91
92#define SYSCONFIG3 6 /* System Configuration 3 */
93#define SYSCONFIG3_SMUTER 0xc000 /* bits 15..14: Softmute Attack/Recover Rate */
94#define SYSCONFIG3_SMUTEA 0x3000 /* bits 13..12: Softmute Attenuation */
95#define SYSCONFIG3_SKSNR 0x00f0 /* bits 07..04: Seek SNR Threshold */
96#define SYSCONFIG3_SKCNT 0x000f /* bits 03..00: Seek FM Impulse Detection Threshold */
97
98#define TEST1 7 /* Test 1 */
99#define TEST1_AHIZEN 0x4000 /* bits 14..14: Audio High-Z Enable */
100
101#define TEST2 8 /* Test 2 */
102/* TEST2 only contains reserved bits */
103
104#define BOOTCONFIG 9 /* Boot Configuration */
105/* BOOTCONFIG only contains reserved bits */
106
107#define STATUSRSSI 10 /* Status RSSI */
108#define STATUSRSSI_RDSR 0x8000 /* bits 15..15: RDS Ready (Si4701 only) */
109#define STATUSRSSI_STC 0x4000 /* bits 14..14: Seek/Tune Complete */
110#define STATUSRSSI_SF 0x2000 /* bits 13..13: Seek Fail/Band Limit */
111#define STATUSRSSI_AFCRL 0x1000 /* bits 12..12: AFC Rail */
112#define STATUSRSSI_RDSS 0x0800 /* bits 11..11: RDS Synchronized (Si4701 only) */
113#define STATUSRSSI_BLERA 0x0600 /* bits 10..09: RDS Block A Errors (Si4701 only) */
114#define STATUSRSSI_ST 0x0100 /* bits 08..08: Stereo Indicator */
115#define STATUSRSSI_RSSI 0x00ff /* bits 07..00: RSSI (Received Signal Strength Indicator) */
116
117#define READCHAN 11 /* Read Channel */
118#define READCHAN_BLERB 0xc000 /* bits 15..14: RDS Block D Errors (Si4701 only) */
119#define READCHAN_BLERC 0x3000 /* bits 13..12: RDS Block C Errors (Si4701 only) */
120#define READCHAN_BLERD 0x0c00 /* bits 11..10: RDS Block B Errors (Si4701 only) */
121#define READCHAN_READCHAN 0x03ff /* bits 09..00: Read Channel */
122
123#define RDSA 12 /* RDSA */
124#define RDSA_RDSA 0xffff /* bits 15..00: RDS Block A Data (Si4701 only) */
125
126#define RDSB 13 /* RDSB */
127#define RDSB_RDSB 0xffff /* bits 15..00: RDS Block B Data (Si4701 only) */
128
129#define RDSC 14 /* RDSC */
130#define RDSC_RDSC 0xffff /* bits 15..00: RDS Block C Data (Si4701 only) */
131
132#define RDSD 15 /* RDSD */
133#define RDSD_RDSD 0xffff /* bits 15..00: RDS Block D Data (Si4701 only) */
134
135
136/**************************************************************************
137 * General Driver Definitions
138 **************************************************************************/
139
140/*
141 * si470x_device - private data
142 */
143struct si470x_device {
144 struct video_device *videodev;
145
146 /* reference to USB and video device */
147 struct usb_device *usbdev;
148 struct usb_interface *intf;
149
150 /* Interrupt endpoint handling */
151 char *int_in_buffer;
152 struct usb_endpoint_descriptor *int_in_endpoint;
153 struct urb *int_in_urb;
154 int int_in_running;
155
156 /* scratch page */
157 unsigned char software_version;
158 unsigned char hardware_version;
159
160 /* driver management */
161 unsigned char disconnected;
162 struct mutex disconnect_lock;
163 unsigned int users;
164
165 /* Silabs internal registers (0..15) */
166 unsigned short registers[RADIO_REGISTER_NUM];
167
168 /* RDS receive buffer */
169 wait_queue_head_t read_queue;
170 struct mutex lock; /* buffer locking */
171 unsigned char *buffer; /* size is always multiple of three */
172 unsigned int buf_size;
173 unsigned int rd_index;
174 unsigned int wr_index;
175};
176
177
178/*
179 * The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW,
180 * 62.5 kHz otherwise.
181 * The tuner is able to have a channel spacing of 50, 100 or 200 kHz.
182 * tuner->capability is therefore set to V4L2_TUNER_CAP_LOW
183 * The FREQ_MUL is then: 1 MHz / 62.5 Hz = 16000
184 */
185#define FREQ_MUL (1000000 / 62.5)
186
187
188
189/**************************************************************************
190 * Common Functions
191 **************************************************************************/
192extern const struct v4l2_file_operations si470x_fops;
193extern struct video_device si470x_viddev_template;
194int si470x_get_register(struct si470x_device *radio, int regnr);
195int si470x_set_register(struct si470x_device *radio, int regnr);
196int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
197int si470x_start(struct si470x_device *radio);
198int si470x_stop(struct si470x_device *radio);
199int si470x_rds_on(struct si470x_device *radio);
200int si470x_vidioc_querycap(struct file *file, void *priv,
201 struct v4l2_capability *capability);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-18 06:36:09 -0500