1 /*
2  * drivers/media/radio/radio-si476x.c -- V4L2 driver for SI476X chips
3  *
4  * Copyright (C) 2012 Innovative Converged Devices(ICD)
5  * Copyright (C) 2013 Andrey Smirnov
6  *
7  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; version 2 of the License.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  */
19 
20 #include <linux/module.h>
21 #include <linux/delay.h>
22 #include <linux/interrupt.h>
23 #include <linux/slab.h>
24 #include <linux/atomic.h>
25 #include <linux/videodev2.h>
26 #include <linux/mutex.h>
27 #include <linux/debugfs.h>
28 #include <media/v4l2-common.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-ctrls.h>
31 #include <media/v4l2-event.h>
32 #include <media/v4l2-device.h>
33 
34 #include <media/si476x.h>
35 #include <linux/mfd/si476x-core.h>
36 
37 #define FM_FREQ_RANGE_LOW   64000000
38 #define FM_FREQ_RANGE_HIGH 108000000
39 
40 #define AM_FREQ_RANGE_LOW    520000
41 #define AM_FREQ_RANGE_HIGH 30000000
42 
43 #define PWRLINEFLTR (1 << 8)
44 
45 #define FREQ_MUL (10000000 / 625)
46 
47 #define SI476X_PHDIV_STATUS_LINK_LOCKED(status) (0x80 & (status))
48 
49 #define DRIVER_NAME "si476x-radio"
50 #define DRIVER_CARD "SI476x AM/FM Receiver"
51 
52 enum si476x_freq_bands {
53 	SI476X_BAND_FM,
54 	SI476X_BAND_AM,
55 };
56 
57 static const struct v4l2_frequency_band si476x_bands[] = {
58 	[SI476X_BAND_FM] = {
59 		.type		= V4L2_TUNER_RADIO,
60 		.index		= SI476X_BAND_FM,
61 		.capability	= V4L2_TUNER_CAP_LOW
62 		| V4L2_TUNER_CAP_STEREO
63 		| V4L2_TUNER_CAP_RDS
64 		| V4L2_TUNER_CAP_RDS_BLOCK_IO
65 		| V4L2_TUNER_CAP_FREQ_BANDS,
66 		.rangelow	=  64 * FREQ_MUL,
67 		.rangehigh	= 108 * FREQ_MUL,
68 		.modulation	= V4L2_BAND_MODULATION_FM,
69 	},
70 	[SI476X_BAND_AM] = {
71 		.type		= V4L2_TUNER_RADIO,
72 		.index		= SI476X_BAND_AM,
73 		.capability	= V4L2_TUNER_CAP_LOW
74 		| V4L2_TUNER_CAP_FREQ_BANDS,
75 		.rangelow	= 0.52 * FREQ_MUL,
76 		.rangehigh	= 30 * FREQ_MUL,
77 		.modulation	= V4L2_BAND_MODULATION_AM,
78 	},
79 };
80 
81 static inline bool si476x_radio_freq_is_inside_of_the_band(u32 freq, int band)
82 {
83 	return freq >= si476x_bands[band].rangelow &&
84 		freq <= si476x_bands[band].rangehigh;
85 }
86 
87 static inline bool si476x_radio_range_is_inside_of_the_band(u32 low, u32 high,
88 							    int band)
89 {
90 	return low  >= si476x_bands[band].rangelow &&
91 		high <= si476x_bands[band].rangehigh;
92 }
93 
94 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl);
95 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
96 
97 enum phase_diversity_modes_idx {
98 	SI476X_IDX_PHDIV_DISABLED,
99 	SI476X_IDX_PHDIV_PRIMARY_COMBINING,
100 	SI476X_IDX_PHDIV_PRIMARY_ANTENNA,
101 	SI476X_IDX_PHDIV_SECONDARY_ANTENNA,
102 	SI476X_IDX_PHDIV_SECONDARY_COMBINING,
103 };
104 
105 static const char * const phase_diversity_modes[] = {
106 	[SI476X_IDX_PHDIV_DISABLED]		= "Disabled",
107 	[SI476X_IDX_PHDIV_PRIMARY_COMBINING]	= "Primary with Secondary",
108 	[SI476X_IDX_PHDIV_PRIMARY_ANTENNA]	= "Primary Antenna",
109 	[SI476X_IDX_PHDIV_SECONDARY_ANTENNA]	= "Secondary Antenna",
110 	[SI476X_IDX_PHDIV_SECONDARY_COMBINING]	= "Secondary with Primary",
111 };
112 
113 static inline enum phase_diversity_modes_idx
114 si476x_phase_diversity_mode_to_idx(enum si476x_phase_diversity_mode mode)
115 {
116 	switch (mode) {
117 	default:		/* FALLTHROUGH */
118 	case SI476X_PHDIV_DISABLED:
119 		return SI476X_IDX_PHDIV_DISABLED;
120 	case SI476X_PHDIV_PRIMARY_COMBINING:
121 		return SI476X_IDX_PHDIV_PRIMARY_COMBINING;
122 	case SI476X_PHDIV_PRIMARY_ANTENNA:
123 		return SI476X_IDX_PHDIV_PRIMARY_ANTENNA;
124 	case SI476X_PHDIV_SECONDARY_ANTENNA:
125 		return SI476X_IDX_PHDIV_SECONDARY_ANTENNA;
126 	case SI476X_PHDIV_SECONDARY_COMBINING:
127 		return SI476X_IDX_PHDIV_SECONDARY_COMBINING;
128 	}
129 }
130 
131 static inline enum si476x_phase_diversity_mode
132 si476x_phase_diversity_idx_to_mode(enum phase_diversity_modes_idx idx)
133 {
134 	static const int idx_to_value[] = {
135 		[SI476X_IDX_PHDIV_DISABLED]		= SI476X_PHDIV_DISABLED,
136 		[SI476X_IDX_PHDIV_PRIMARY_COMBINING]	= SI476X_PHDIV_PRIMARY_COMBINING,
137 		[SI476X_IDX_PHDIV_PRIMARY_ANTENNA]	= SI476X_PHDIV_PRIMARY_ANTENNA,
138 		[SI476X_IDX_PHDIV_SECONDARY_ANTENNA]	= SI476X_PHDIV_SECONDARY_ANTENNA,
139 		[SI476X_IDX_PHDIV_SECONDARY_COMBINING]	= SI476X_PHDIV_SECONDARY_COMBINING,
140 	};
141 
142 	return idx_to_value[idx];
143 }
144 
145 static const struct v4l2_ctrl_ops si476x_ctrl_ops = {
146 	.g_volatile_ctrl	= si476x_radio_g_volatile_ctrl,
147 	.s_ctrl			= si476x_radio_s_ctrl,
148 };
149 
150 
151 enum si476x_ctrl_idx {
152 	SI476X_IDX_RSSI_THRESHOLD,
153 	SI476X_IDX_SNR_THRESHOLD,
154 	SI476X_IDX_MAX_TUNE_ERROR,
155 	SI476X_IDX_HARMONICS_COUNT,
156 	SI476X_IDX_DIVERSITY_MODE,
157 	SI476X_IDX_INTERCHIP_LINK,
158 };
159 static struct v4l2_ctrl_config si476x_ctrls[] = {
160 
161 	/**
162 	 * SI476X during its station seeking(or tuning) process uses several
163 	 * parameters to detrmine if "the station" is valid:
164 	 *
165 	 *	- Signal's SNR(in dBuV) must be lower than
166 	 *	#V4L2_CID_SI476X_SNR_THRESHOLD
167 	 *	- Signal's RSSI(in dBuV) must be greater than
168 	 *	#V4L2_CID_SI476X_RSSI_THRESHOLD
169 	 *	- Signal's frequency deviation(in units of 2ppm) must not be
170 	 *	more than #V4L2_CID_SI476X_MAX_TUNE_ERROR
171 	 */
172 	[SI476X_IDX_RSSI_THRESHOLD] = {
173 		.ops	= &si476x_ctrl_ops,
174 		.id	= V4L2_CID_SI476X_RSSI_THRESHOLD,
175 		.name	= "Valid RSSI Threshold",
176 		.type	= V4L2_CTRL_TYPE_INTEGER,
177 		.min	= -128,
178 		.max	= 127,
179 		.step	= 1,
180 	},
181 	[SI476X_IDX_SNR_THRESHOLD] = {
182 		.ops	= &si476x_ctrl_ops,
183 		.id	= V4L2_CID_SI476X_SNR_THRESHOLD,
184 		.type	= V4L2_CTRL_TYPE_INTEGER,
185 		.name	= "Valid SNR Threshold",
186 		.min	= -128,
187 		.max	= 127,
188 		.step	= 1,
189 	},
190 	[SI476X_IDX_MAX_TUNE_ERROR] = {
191 		.ops	= &si476x_ctrl_ops,
192 		.id	= V4L2_CID_SI476X_MAX_TUNE_ERROR,
193 		.type	= V4L2_CTRL_TYPE_INTEGER,
194 		.name	= "Max Tune Errors",
195 		.min	= 0,
196 		.max	= 126 * 2,
197 		.step	= 2,
198 	},
199 
200 	/**
201 	 * #V4L2_CID_SI476X_HARMONICS_COUNT -- number of harmonics
202 	 * built-in power-line noise supression filter is to reject
203 	 * during AM-mode operation.
204 	 */
205 	[SI476X_IDX_HARMONICS_COUNT] = {
206 		.ops	= &si476x_ctrl_ops,
207 		.id	= V4L2_CID_SI476X_HARMONICS_COUNT,
208 		.type	= V4L2_CTRL_TYPE_INTEGER,
209 
210 		.name	= "Count of Harmonics to Reject",
211 		.min	= 0,
212 		.max	= 20,
213 		.step	= 1,
214 	},
215 
216 	/**
217 	 * #V4L2_CID_SI476X_DIVERSITY_MODE -- configuration which
218 	 * two tuners working in diversity mode are to work in.
219 	 *
220 	 *  - #SI476X_IDX_PHDIV_DISABLED diversity mode disabled
221 	 *  - #SI476X_IDX_PHDIV_PRIMARY_COMBINING diversity mode is
222 	 *  on, primary tuner's antenna is the main one.
223 	 *  - #SI476X_IDX_PHDIV_PRIMARY_ANTENNA diversity mode is
224 	 *  off, primary tuner's antenna is the main one.
225 	 *  - #SI476X_IDX_PHDIV_SECONDARY_ANTENNA diversity mode is
226 	 *  off, secondary tuner's antenna is the main one.
227 	 *  - #SI476X_IDX_PHDIV_SECONDARY_COMBINING diversity mode is
228 	 *  on, secondary tuner's antenna is the main one.
229 	 */
230 	[SI476X_IDX_DIVERSITY_MODE] = {
231 		.ops	= &si476x_ctrl_ops,
232 		.id	= V4L2_CID_SI476X_DIVERSITY_MODE,
233 		.type	= V4L2_CTRL_TYPE_MENU,
234 		.name	= "Phase Diversity Mode",
235 		.qmenu	= phase_diversity_modes,
236 		.min	= 0,
237 		.max	= ARRAY_SIZE(phase_diversity_modes) - 1,
238 	},
239 
240 	/**
241 	 * #V4L2_CID_SI476X_INTERCHIP_LINK -- inter-chip link in
242 	 * diversity mode indicator. Allows user to determine if two
243 	 * chips working in diversity mode have established a link
244 	 * between each other and if the system as a whole uses
245 	 * signals from both antennas to receive FM radio.
246 	 */
247 	[SI476X_IDX_INTERCHIP_LINK] = {
248 		.ops	= &si476x_ctrl_ops,
249 		.id	= V4L2_CID_SI476X_INTERCHIP_LINK,
250 		.type	= V4L2_CTRL_TYPE_BOOLEAN,
251 		.flags  = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_VOLATILE,
252 		.name	= "Inter-Chip Link",
253 		.min	= 0,
254 		.max	= 1,
255 		.step	= 1,
256 	},
257 };
258 
259 struct si476x_radio;
260 
261 /**
262  * struct si476x_radio_ops - vtable of tuner functions
263  *
264  * This table holds pointers to functions implementing particular
265  * operations depending on the mode in which the tuner chip was
266  * configured to start in. If the function is not supported
267  * corresponding element is set to #NULL.
268  *
269  * @tune_freq: Tune chip to a specific frequency
270  * @seek_start: Star station seeking
271  * @rsq_status: Get Received Signal Quality(RSQ) status
272  * @rds_blckcnt: Get received RDS blocks count
273  * @phase_diversity: Change phase diversity mode of the tuner
274  * @phase_div_status: Get phase diversity mode status
275  * @acf_status: Get the status of Automatically Controlled
276  * Features(ACF)
277  * @agc_status: Get Automatic Gain Control(AGC) status
278  */
279 struct si476x_radio_ops {
280 	int (*tune_freq)(struct si476x_core *, struct si476x_tune_freq_args *);
281 	int (*seek_start)(struct si476x_core *, bool, bool);
282 	int (*rsq_status)(struct si476x_core *, struct si476x_rsq_status_args *,
283 			  struct si476x_rsq_status_report *);
284 	int (*rds_blckcnt)(struct si476x_core *, bool,
285 			   struct si476x_rds_blockcount_report *);
286 
287 	int (*phase_diversity)(struct si476x_core *,
288 			       enum si476x_phase_diversity_mode);
289 	int (*phase_div_status)(struct si476x_core *);
290 	int (*acf_status)(struct si476x_core *,
291 			  struct si476x_acf_status_report *);
292 	int (*agc_status)(struct si476x_core *,
293 			  struct si476x_agc_status_report *);
294 };
295 
296 /**
297  * struct si476x_radio - radio device
298  *
299  * @core: Pointer to underlying core device
300  * @videodev: Pointer to video device created by V4L2 subsystem
301  * @ops: Vtable of functions. See struct si476x_radio_ops for details
302  * @kref: Reference counter
303  * @core_lock: An r/w semaphore to brebvent the deletion of underlying
304  * core structure is the radio device is being used
305  */
306 struct si476x_radio {
307 	struct v4l2_device v4l2dev;
308 	struct video_device videodev;
309 	struct v4l2_ctrl_handler ctrl_handler;
310 
311 	struct si476x_core  *core;
312 	/* This field should not be accesses unless core lock is held */
313 	const struct si476x_radio_ops *ops;
314 
315 	struct dentry	*debugfs;
316 	u32 audmode;
317 };
318 
319 static inline struct si476x_radio *
320 v4l2_dev_to_radio(struct v4l2_device *d)
321 {
322 	return container_of(d, struct si476x_radio, v4l2dev);
323 }
324 
325 static inline struct si476x_radio *
326 v4l2_ctrl_handler_to_radio(struct v4l2_ctrl_handler *d)
327 {
328 	return container_of(d, struct si476x_radio, ctrl_handler);
329 }
330 
331 /*
332  * si476x_vidioc_querycap - query device capabilities
333  */
334 static int si476x_radio_querycap(struct file *file, void *priv,
335 				 struct v4l2_capability *capability)
336 {
337 	struct si476x_radio *radio = video_drvdata(file);
338 
339 	strlcpy(capability->driver, radio->v4l2dev.name,
340 		sizeof(capability->driver));
341 	strlcpy(capability->card,   DRIVER_CARD, sizeof(capability->card));
342 	snprintf(capability->bus_info, sizeof(capability->bus_info),
343 		 "platform:%s", radio->v4l2dev.name);
344 
345 	capability->device_caps = V4L2_CAP_TUNER
346 		| V4L2_CAP_RADIO
347 		| V4L2_CAP_HW_FREQ_SEEK;
348 
349 	si476x_core_lock(radio->core);
350 	if (!si476x_core_is_a_secondary_tuner(radio->core))
351 		capability->device_caps |= V4L2_CAP_RDS_CAPTURE
352 			| V4L2_CAP_READWRITE;
353 	si476x_core_unlock(radio->core);
354 
355 	capability->capabilities = capability->device_caps
356 		| V4L2_CAP_DEVICE_CAPS;
357 	return 0;
358 }
359 
360 static int si476x_radio_enum_freq_bands(struct file *file, void *priv,
361 					struct v4l2_frequency_band *band)
362 {
363 	int err;
364 	struct si476x_radio *radio = video_drvdata(file);
365 
366 	if (band->tuner != 0)
367 		return -EINVAL;
368 
369 	switch (radio->core->chip_id) {
370 		/* AM/FM tuners -- all bands are supported */
371 	case SI476X_CHIP_SI4761:
372 	case SI476X_CHIP_SI4764:
373 		if (band->index < ARRAY_SIZE(si476x_bands)) {
374 			*band = si476x_bands[band->index];
375 			err = 0;
376 		} else {
377 			err = -EINVAL;
378 		}
379 		break;
380 		/* FM companion tuner chips -- only FM bands are
381 		 * supported */
382 	case SI476X_CHIP_SI4768:
383 		if (band->index == SI476X_BAND_FM) {
384 			*band = si476x_bands[band->index];
385 			err = 0;
386 		} else {
387 			err = -EINVAL;
388 		}
389 		break;
390 	default:
391 		err = -EINVAL;
392 	}
393 
394 	return err;
395 }
396 
397 static int si476x_radio_g_tuner(struct file *file, void *priv,
398 				struct v4l2_tuner *tuner)
399 {
400 	int err;
401 	struct si476x_rsq_status_report report;
402 	struct si476x_radio *radio = video_drvdata(file);
403 
404 	struct si476x_rsq_status_args args = {
405 		.primary	= false,
406 		.rsqack		= false,
407 		.attune		= false,
408 		.cancel		= false,
409 		.stcack		= false,
410 	};
411 
412 	if (tuner->index != 0)
413 		return -EINVAL;
414 
415 	tuner->type       = V4L2_TUNER_RADIO;
416 	tuner->capability = V4L2_TUNER_CAP_LOW /* Measure frequencies
417 						 * in multiples of
418 						 * 62.5 Hz */
419 		| V4L2_TUNER_CAP_STEREO
420 		| V4L2_TUNER_CAP_HWSEEK_BOUNDED
421 		| V4L2_TUNER_CAP_HWSEEK_WRAP
422 		| V4L2_TUNER_CAP_HWSEEK_PROG_LIM;
423 
424 	si476x_core_lock(radio->core);
425 
426 	if (si476x_core_is_a_secondary_tuner(radio->core)) {
427 		strlcpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
428 		tuner->rxsubchans = 0;
429 		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
430 	} else if (si476x_core_has_am(radio->core)) {
431 		if (si476x_core_is_a_primary_tuner(radio->core))
432 			strlcpy(tuner->name, "AM/FM (primary)",
433 				sizeof(tuner->name));
434 		else
435 			strlcpy(tuner->name, "AM/FM", sizeof(tuner->name));
436 
437 		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO
438 			| V4L2_TUNER_SUB_RDS;
439 		tuner->capability |= V4L2_TUNER_CAP_RDS
440 			| V4L2_TUNER_CAP_RDS_BLOCK_IO
441 			| V4L2_TUNER_CAP_FREQ_BANDS;
442 
443 		tuner->rangelow = si476x_bands[SI476X_BAND_AM].rangelow;
444 	} else {
445 		strlcpy(tuner->name, "FM", sizeof(tuner->name));
446 		tuner->rxsubchans = V4L2_TUNER_SUB_RDS;
447 		tuner->capability |= V4L2_TUNER_CAP_RDS
448 			| V4L2_TUNER_CAP_RDS_BLOCK_IO
449 			| V4L2_TUNER_CAP_FREQ_BANDS;
450 		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
451 	}
452 
453 	tuner->audmode = radio->audmode;
454 
455 	tuner->afc = 1;
456 	tuner->rangehigh = si476x_bands[SI476X_BAND_FM].rangehigh;
457 
458 	err = radio->ops->rsq_status(radio->core,
459 				     &args, &report);
460 	if (err < 0) {
461 		tuner->signal = 0;
462 	} else {
463 		/*
464 		 * tuner->signal value range: 0x0000 .. 0xFFFF,
465 		 * report.rssi: -128 .. 127
466 		 */
467 		tuner->signal = (report.rssi + 128) * 257;
468 	}
469 	si476x_core_unlock(radio->core);
470 
471 	return err;
472 }
473 
474 static int si476x_radio_s_tuner(struct file *file, void *priv,
475 				const struct v4l2_tuner *tuner)
476 {
477 	struct si476x_radio *radio = video_drvdata(file);
478 
479 	if (tuner->index != 0)
480 		return -EINVAL;
481 
482 	if (tuner->audmode == V4L2_TUNER_MODE_MONO ||
483 	    tuner->audmode == V4L2_TUNER_MODE_STEREO)
484 		radio->audmode = tuner->audmode;
485 	else
486 		radio->audmode = V4L2_TUNER_MODE_STEREO;
487 
488 	return 0;
489 }
490 
491 static int si476x_radio_init_vtable(struct si476x_radio *radio,
492 				    enum si476x_func func)
493 {
494 	static const struct si476x_radio_ops fm_ops = {
495 		.tune_freq		= si476x_core_cmd_fm_tune_freq,
496 		.seek_start		= si476x_core_cmd_fm_seek_start,
497 		.rsq_status		= si476x_core_cmd_fm_rsq_status,
498 		.rds_blckcnt		= si476x_core_cmd_fm_rds_blockcount,
499 		.phase_diversity	= si476x_core_cmd_fm_phase_diversity,
500 		.phase_div_status	= si476x_core_cmd_fm_phase_div_status,
501 		.acf_status		= si476x_core_cmd_fm_acf_status,
502 		.agc_status		= si476x_core_cmd_agc_status,
503 	};
504 
505 	static const struct si476x_radio_ops am_ops = {
506 		.tune_freq		= si476x_core_cmd_am_tune_freq,
507 		.seek_start		= si476x_core_cmd_am_seek_start,
508 		.rsq_status		= si476x_core_cmd_am_rsq_status,
509 		.rds_blckcnt		= NULL,
510 		.phase_diversity	= NULL,
511 		.phase_div_status	= NULL,
512 		.acf_status		= si476x_core_cmd_am_acf_status,
513 		.agc_status		= NULL,
514 	};
515 
516 	switch (func) {
517 	case SI476X_FUNC_FM_RECEIVER:
518 		radio->ops = &fm_ops;
519 		return 0;
520 
521 	case SI476X_FUNC_AM_RECEIVER:
522 		radio->ops = &am_ops;
523 		return 0;
524 	default:
525 		WARN(1, "Unexpected tuner function value\n");
526 		return -EINVAL;
527 	}
528 }
529 
530 static int si476x_radio_pretune(struct si476x_radio *radio,
531 				enum si476x_func func)
532 {
533 	int retval;
534 
535 	struct si476x_tune_freq_args args = {
536 		.zifsr		= false,
537 		.hd		= false,
538 		.injside	= SI476X_INJSIDE_AUTO,
539 		.tunemode	= SI476X_TM_VALIDATED_NORMAL_TUNE,
540 		.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO,
541 		.antcap		= 0,
542 	};
543 
544 	switch (func) {
545 	case SI476X_FUNC_FM_RECEIVER:
546 		args.freq = v4l2_to_si476x(radio->core,
547 					   92 * FREQ_MUL);
548 		retval = radio->ops->tune_freq(radio->core, &args);
549 		break;
550 	case SI476X_FUNC_AM_RECEIVER:
551 		args.freq = v4l2_to_si476x(radio->core,
552 					   0.6 * FREQ_MUL);
553 		retval = radio->ops->tune_freq(radio->core, &args);
554 		break;
555 	default:
556 		WARN(1, "Unexpected tuner function value\n");
557 		retval = -EINVAL;
558 	}
559 
560 	return retval;
561 }
562 static int si476x_radio_do_post_powerup_init(struct si476x_radio *radio,
563 					     enum si476x_func func)
564 {
565 	int err;
566 
567 	/* regcache_mark_dirty(radio->core->regmap); */
568 	err = regcache_sync_region(radio->core->regmap,
569 				   SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE,
570 				   SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT);
571 	if (err < 0)
572 		return err;
573 
574 	err = regcache_sync_region(radio->core->regmap,
575 				   SI476X_PROP_AUDIO_DEEMPHASIS,
576 				   SI476X_PROP_AUDIO_PWR_LINE_FILTER);
577 	if (err < 0)
578 		return err;
579 
580 	err = regcache_sync_region(radio->core->regmap,
581 				   SI476X_PROP_INT_CTL_ENABLE,
582 				   SI476X_PROP_INT_CTL_ENABLE);
583 	if (err < 0)
584 		return err;
585 
586 	/*
587 	 * Is there any point in restoring SNR and the like
588 	 * when switching between AM/FM?
589 	 */
590 	err = regcache_sync_region(radio->core->regmap,
591 				   SI476X_PROP_VALID_MAX_TUNE_ERROR,
592 				   SI476X_PROP_VALID_MAX_TUNE_ERROR);
593 	if (err < 0)
594 		return err;
595 
596 	err = regcache_sync_region(radio->core->regmap,
597 				   SI476X_PROP_VALID_SNR_THRESHOLD,
598 				   SI476X_PROP_VALID_RSSI_THRESHOLD);
599 	if (err < 0)
600 		return err;
601 
602 	if (func == SI476X_FUNC_FM_RECEIVER) {
603 		if (si476x_core_has_diversity(radio->core)) {
604 			err = si476x_core_cmd_fm_phase_diversity(radio->core,
605 								 radio->core->diversity_mode);
606 			if (err < 0)
607 				return err;
608 		}
609 
610 		err = regcache_sync_region(radio->core->regmap,
611 					   SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
612 					   SI476X_PROP_FM_RDS_CONFIG);
613 		if (err < 0)
614 			return err;
615 	}
616 
617 	return si476x_radio_init_vtable(radio, func);
618 
619 }
620 
621 static int si476x_radio_change_func(struct si476x_radio *radio,
622 				    enum si476x_func func)
623 {
624 	int err;
625 	bool soft;
626 	/*
627 	 * Since power/up down is a very time consuming operation,
628 	 * try to avoid doing it if the requested mode matches the one
629 	 * the tuner is in
630 	 */
631 	if (func == radio->core->power_up_parameters.func)
632 		return 0;
633 
634 	soft = true;
635 	err = si476x_core_stop(radio->core, soft);
636 	if (err < 0) {
637 		/*
638 		 * OK, if the chip does not want to play nice let's
639 		 * try to reset it in more brutal way
640 		 */
641 		soft = false;
642 		err = si476x_core_stop(radio->core, soft);
643 		if (err < 0)
644 			return err;
645 	}
646 	/*
647 	  Set the desired radio tuner function
648 	 */
649 	radio->core->power_up_parameters.func = func;
650 
651 	err = si476x_core_start(radio->core, soft);
652 	if (err < 0)
653 		return err;
654 
655 	/*
656 	 * No need to do the rest of manipulations for the bootlader
657 	 * mode
658 	 */
659 	if (func != SI476X_FUNC_FM_RECEIVER &&
660 	    func != SI476X_FUNC_AM_RECEIVER)
661 		return err;
662 
663 	return si476x_radio_do_post_powerup_init(radio, func);
664 }
665 
666 static int si476x_radio_g_frequency(struct file *file, void *priv,
667 			      struct v4l2_frequency *f)
668 {
669 	int err;
670 	struct si476x_radio *radio = video_drvdata(file);
671 
672 	if (f->tuner != 0 ||
673 	    f->type  != V4L2_TUNER_RADIO)
674 		return -EINVAL;
675 
676 	si476x_core_lock(radio->core);
677 
678 	if (radio->ops->rsq_status) {
679 		struct si476x_rsq_status_report report;
680 		struct si476x_rsq_status_args   args = {
681 			.primary	= false,
682 			.rsqack		= false,
683 			.attune		= true,
684 			.cancel		= false,
685 			.stcack		= false,
686 		};
687 
688 		err = radio->ops->rsq_status(radio->core, &args, &report);
689 		if (!err)
690 			f->frequency = si476x_to_v4l2(radio->core,
691 						      report.readfreq);
692 	} else {
693 		err = -EINVAL;
694 	}
695 
696 	si476x_core_unlock(radio->core);
697 
698 	return err;
699 }
700 
701 static int si476x_radio_s_frequency(struct file *file, void *priv,
702 				    const struct v4l2_frequency *f)
703 {
704 	int err;
705 	u32 freq = f->frequency;
706 	struct si476x_tune_freq_args args;
707 	struct si476x_radio *radio = video_drvdata(file);
708 
709 	const u32 midrange = (si476x_bands[SI476X_BAND_AM].rangehigh +
710 			      si476x_bands[SI476X_BAND_FM].rangelow) / 2;
711 	const int band = (freq > midrange) ?
712 		SI476X_BAND_FM : SI476X_BAND_AM;
713 	const enum si476x_func func = (band == SI476X_BAND_AM) ?
714 		SI476X_FUNC_AM_RECEIVER : SI476X_FUNC_FM_RECEIVER;
715 
716 	if (f->tuner != 0 ||
717 	    f->type  != V4L2_TUNER_RADIO)
718 		return -EINVAL;
719 
720 	si476x_core_lock(radio->core);
721 
722 	freq = clamp(freq,
723 		     si476x_bands[band].rangelow,
724 		     si476x_bands[band].rangehigh);
725 
726 	if (si476x_radio_freq_is_inside_of_the_band(freq,
727 						    SI476X_BAND_AM) &&
728 	    (!si476x_core_has_am(radio->core) ||
729 	     si476x_core_is_a_secondary_tuner(radio->core))) {
730 		err = -EINVAL;
731 		goto unlock;
732 	}
733 
734 	err = si476x_radio_change_func(radio, func);
735 	if (err < 0)
736 		goto unlock;
737 
738 	args.zifsr		= false;
739 	args.hd			= false;
740 	args.injside		= SI476X_INJSIDE_AUTO;
741 	args.freq		= v4l2_to_si476x(radio->core, freq);
742 	args.tunemode		= SI476X_TM_VALIDATED_NORMAL_TUNE;
743 	args.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO;
744 	args.antcap		= 0;
745 
746 	err = radio->ops->tune_freq(radio->core, &args);
747 
748 unlock:
749 	si476x_core_unlock(radio->core);
750 	return err;
751 }
752 
753 static int si476x_radio_s_hw_freq_seek(struct file *file, void *priv,
754 				       const struct v4l2_hw_freq_seek *seek)
755 {
756 	int err;
757 	enum si476x_func func;
758 	u32 rangelow, rangehigh;
759 	struct si476x_radio *radio = video_drvdata(file);
760 
761 	if (file->f_flags & O_NONBLOCK)
762 		return -EAGAIN;
763 
764 	if (seek->tuner != 0 ||
765 	    seek->type  != V4L2_TUNER_RADIO)
766 		return -EINVAL;
767 
768 	si476x_core_lock(radio->core);
769 
770 	if (!seek->rangelow) {
771 		err = regmap_read(radio->core->regmap,
772 				  SI476X_PROP_SEEK_BAND_BOTTOM,
773 				  &rangelow);
774 		if (!err)
775 			rangelow = si476x_to_v4l2(radio->core, rangelow);
776 		else
777 			goto unlock;
778 	}
779 	if (!seek->rangehigh) {
780 		err = regmap_read(radio->core->regmap,
781 				  SI476X_PROP_SEEK_BAND_TOP,
782 				  &rangehigh);
783 		if (!err)
784 			rangehigh = si476x_to_v4l2(radio->core, rangehigh);
785 		else
786 			goto unlock;
787 	}
788 
789 	if (rangelow > rangehigh) {
790 		err = -EINVAL;
791 		goto unlock;
792 	}
793 
794 	if (si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
795 						     SI476X_BAND_FM)) {
796 		func = SI476X_FUNC_FM_RECEIVER;
797 
798 	} else if (si476x_core_has_am(radio->core) &&
799 		   si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
800 							    SI476X_BAND_AM)) {
801 		func = SI476X_FUNC_AM_RECEIVER;
802 	} else {
803 		err = -EINVAL;
804 		goto unlock;
805 	}
806 
807 	err = si476x_radio_change_func(radio, func);
808 	if (err < 0)
809 		goto unlock;
810 
811 	if (seek->rangehigh) {
812 		err = regmap_write(radio->core->regmap,
813 				   SI476X_PROP_SEEK_BAND_TOP,
814 				   v4l2_to_si476x(radio->core,
815 						  seek->rangehigh));
816 		if (err)
817 			goto unlock;
818 	}
819 	if (seek->rangelow) {
820 		err = regmap_write(radio->core->regmap,
821 				   SI476X_PROP_SEEK_BAND_BOTTOM,
822 				   v4l2_to_si476x(radio->core,
823 						  seek->rangelow));
824 		if (err)
825 			goto unlock;
826 	}
827 	if (seek->spacing) {
828 		err = regmap_write(radio->core->regmap,
829 				     SI476X_PROP_SEEK_FREQUENCY_SPACING,
830 				     v4l2_to_si476x(radio->core,
831 						    seek->spacing));
832 		if (err)
833 			goto unlock;
834 	}
835 
836 	err = radio->ops->seek_start(radio->core,
837 				     seek->seek_upward,
838 				     seek->wrap_around);
839 unlock:
840 	si476x_core_unlock(radio->core);
841 
842 
843 
844 	return err;
845 }
846 
847 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
848 {
849 	int retval;
850 	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
851 
852 	si476x_core_lock(radio->core);
853 
854 	switch (ctrl->id) {
855 	case V4L2_CID_SI476X_INTERCHIP_LINK:
856 		if (si476x_core_has_diversity(radio->core)) {
857 			if (radio->ops->phase_diversity) {
858 				retval = radio->ops->phase_div_status(radio->core);
859 				if (retval < 0)
860 					break;
861 
862 				ctrl->val = !!SI476X_PHDIV_STATUS_LINK_LOCKED(retval);
863 				retval = 0;
864 				break;
865 			} else {
866 				retval = -ENOTTY;
867 				break;
868 			}
869 		}
870 		retval = -EINVAL;
871 		break;
872 	default:
873 		retval = -EINVAL;
874 		break;
875 	}
876 	si476x_core_unlock(radio->core);
877 	return retval;
878 
879 }
880 
881 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl)
882 {
883 	int retval;
884 	enum si476x_phase_diversity_mode mode;
885 	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
886 
887 	si476x_core_lock(radio->core);
888 
889 	switch (ctrl->id) {
890 	case V4L2_CID_SI476X_HARMONICS_COUNT:
891 		retval = regmap_update_bits(radio->core->regmap,
892 					    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
893 					    SI476X_PROP_PWR_HARMONICS_MASK,
894 					    ctrl->val);
895 		break;
896 	case V4L2_CID_POWER_LINE_FREQUENCY:
897 		switch (ctrl->val) {
898 		case V4L2_CID_POWER_LINE_FREQUENCY_DISABLED:
899 			retval = regmap_update_bits(radio->core->regmap,
900 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
901 						    SI476X_PROP_PWR_ENABLE_MASK,
902 						    0);
903 			break;
904 		case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
905 			retval = regmap_update_bits(radio->core->regmap,
906 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
907 						    SI476X_PROP_PWR_GRID_MASK,
908 						    SI476X_PROP_PWR_GRID_50HZ);
909 			break;
910 		case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
911 			retval = regmap_update_bits(radio->core->regmap,
912 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
913 						    SI476X_PROP_PWR_GRID_MASK,
914 						    SI476X_PROP_PWR_GRID_60HZ);
915 			break;
916 		default:
917 			retval = -EINVAL;
918 			break;
919 		}
920 		break;
921 	case V4L2_CID_SI476X_RSSI_THRESHOLD:
922 		retval = regmap_write(radio->core->regmap,
923 				      SI476X_PROP_VALID_RSSI_THRESHOLD,
924 				      ctrl->val);
925 		break;
926 	case V4L2_CID_SI476X_SNR_THRESHOLD:
927 		retval = regmap_write(radio->core->regmap,
928 				      SI476X_PROP_VALID_SNR_THRESHOLD,
929 				      ctrl->val);
930 		break;
931 	case V4L2_CID_SI476X_MAX_TUNE_ERROR:
932 		retval = regmap_write(radio->core->regmap,
933 				      SI476X_PROP_VALID_MAX_TUNE_ERROR,
934 				      ctrl->val);
935 		break;
936 	case V4L2_CID_RDS_RECEPTION:
937 		/*
938 		 * It looks like RDS related properties are
939 		 * inaccesable when tuner is in AM mode, so cache the
940 		 * changes
941 		 */
942 		if (si476x_core_is_in_am_receiver_mode(radio->core))
943 			regcache_cache_only(radio->core->regmap, true);
944 
945 		if (ctrl->val) {
946 			retval = regmap_write(radio->core->regmap,
947 					      SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT,
948 					      radio->core->rds_fifo_depth);
949 			if (retval < 0)
950 				break;
951 
952 			if (radio->core->client->irq) {
953 				retval = regmap_write(radio->core->regmap,
954 						      SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
955 						      SI476X_RDSRECV);
956 				if (retval < 0)
957 					break;
958 			}
959 
960 			/* Drain RDS FIFO before enabling RDS processing */
961 			retval = si476x_core_cmd_fm_rds_status(radio->core,
962 							       false,
963 							       true,
964 							       true,
965 							       NULL);
966 			if (retval < 0)
967 				break;
968 
969 			retval = regmap_update_bits(radio->core->regmap,
970 						    SI476X_PROP_FM_RDS_CONFIG,
971 						    SI476X_PROP_RDSEN_MASK,
972 						    SI476X_PROP_RDSEN);
973 		} else {
974 			retval = regmap_update_bits(radio->core->regmap,
975 						    SI476X_PROP_FM_RDS_CONFIG,
976 						    SI476X_PROP_RDSEN_MASK,
977 						    !SI476X_PROP_RDSEN);
978 		}
979 
980 		if (si476x_core_is_in_am_receiver_mode(radio->core))
981 			regcache_cache_only(radio->core->regmap, false);
982 		break;
983 	case V4L2_CID_TUNE_DEEMPHASIS:
984 		retval = regmap_write(radio->core->regmap,
985 				      SI476X_PROP_AUDIO_DEEMPHASIS,
986 				      ctrl->val);
987 		break;
988 
989 	case V4L2_CID_SI476X_DIVERSITY_MODE:
990 		mode = si476x_phase_diversity_idx_to_mode(ctrl->val);
991 
992 		if (mode == radio->core->diversity_mode) {
993 			retval = 0;
994 			break;
995 		}
996 
997 		if (si476x_core_is_in_am_receiver_mode(radio->core)) {
998 			/*
999 			 * Diversity cannot be configured while tuner
1000 			 * is in AM mode so save the changes and carry on.
1001 			 */
1002 			radio->core->diversity_mode = mode;
1003 			retval = 0;
1004 		} else {
1005 			retval = radio->ops->phase_diversity(radio->core, mode);
1006 			if (!retval)
1007 				radio->core->diversity_mode = mode;
1008 		}
1009 		break;
1010 
1011 	default:
1012 		retval = -EINVAL;
1013 		break;
1014 	}
1015 
1016 	si476x_core_unlock(radio->core);
1017 
1018 	return retval;
1019 }
1020 
1021 #ifdef CONFIG_VIDEO_ADV_DEBUG
1022 static int si476x_radio_g_register(struct file *file, void *fh,
1023 				   struct v4l2_dbg_register *reg)
1024 {
1025 	int err;
1026 	unsigned int value;
1027 	struct si476x_radio *radio = video_drvdata(file);
1028 
1029 	si476x_core_lock(radio->core);
1030 	reg->size = 2;
1031 	err = regmap_read(radio->core->regmap,
1032 			  (unsigned int)reg->reg, &value);
1033 	reg->val = value;
1034 	si476x_core_unlock(radio->core);
1035 
1036 	return err;
1037 }
1038 static int si476x_radio_s_register(struct file *file, void *fh,
1039 				   const struct v4l2_dbg_register *reg)
1040 {
1041 
1042 	int err;
1043 	struct si476x_radio *radio = video_drvdata(file);
1044 
1045 	si476x_core_lock(radio->core);
1046 	err = regmap_write(radio->core->regmap,
1047 			   (unsigned int)reg->reg,
1048 			   (unsigned int)reg->val);
1049 	si476x_core_unlock(radio->core);
1050 
1051 	return err;
1052 }
1053 #endif
1054 
1055 static int si476x_radio_fops_open(struct file *file)
1056 {
1057 	struct si476x_radio *radio = video_drvdata(file);
1058 	int err;
1059 
1060 	err = v4l2_fh_open(file);
1061 	if (err)
1062 		return err;
1063 
1064 	if (v4l2_fh_is_singular_file(file)) {
1065 		si476x_core_lock(radio->core);
1066 		err = si476x_core_set_power_state(radio->core,
1067 						  SI476X_POWER_UP_FULL);
1068 		if (err < 0)
1069 			goto done;
1070 
1071 		err = si476x_radio_do_post_powerup_init(radio,
1072 							radio->core->power_up_parameters.func);
1073 		if (err < 0)
1074 			goto power_down;
1075 
1076 		err = si476x_radio_pretune(radio,
1077 					   radio->core->power_up_parameters.func);
1078 		if (err < 0)
1079 			goto power_down;
1080 
1081 		si476x_core_unlock(radio->core);
1082 		/*Must be done after si476x_core_unlock to prevent a deadlock*/
1083 		v4l2_ctrl_handler_setup(&radio->ctrl_handler);
1084 	}
1085 
1086 	return err;
1087 
1088 power_down:
1089 	si476x_core_set_power_state(radio->core,
1090 				    SI476X_POWER_DOWN);
1091 done:
1092 	si476x_core_unlock(radio->core);
1093 	v4l2_fh_release(file);
1094 
1095 	return err;
1096 }
1097 
1098 static int si476x_radio_fops_release(struct file *file)
1099 {
1100 	int err;
1101 	struct si476x_radio *radio = video_drvdata(file);
1102 
1103 	if (v4l2_fh_is_singular_file(file) &&
1104 	    atomic_read(&radio->core->is_alive))
1105 		si476x_core_set_power_state(radio->core,
1106 					    SI476X_POWER_DOWN);
1107 
1108 	err = v4l2_fh_release(file);
1109 
1110 	return err;
1111 }
1112 
1113 static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
1114 				      size_t count, loff_t *ppos)
1115 {
1116 	ssize_t      rval;
1117 	size_t       fifo_len;
1118 	unsigned int copied;
1119 
1120 	struct si476x_radio *radio = video_drvdata(file);
1121 
1122 	/* block if no new data available */
1123 	if (kfifo_is_empty(&radio->core->rds_fifo)) {
1124 		if (file->f_flags & O_NONBLOCK)
1125 			return -EWOULDBLOCK;
1126 
1127 		rval = wait_event_interruptible(radio->core->rds_read_queue,
1128 						(!kfifo_is_empty(&radio->core->rds_fifo) ||
1129 						 !atomic_read(&radio->core->is_alive)));
1130 		if (rval < 0)
1131 			return -EINTR;
1132 
1133 		if (!atomic_read(&radio->core->is_alive))
1134 			return -ENODEV;
1135 	}
1136 
1137 	fifo_len = kfifo_len(&radio->core->rds_fifo);
1138 
1139 	if (kfifo_to_user(&radio->core->rds_fifo, buf,
1140 			  min(fifo_len, count),
1141 			  &copied) != 0) {
1142 		dev_warn(&radio->videodev.dev,
1143 			 "Error during FIFO to userspace copy\n");
1144 		rval = -EIO;
1145 	} else {
1146 		rval = (ssize_t)copied;
1147 	}
1148 
1149 	return rval;
1150 }
1151 
1152 static unsigned int si476x_radio_fops_poll(struct file *file,
1153 				struct poll_table_struct *pts)
1154 {
1155 	struct si476x_radio *radio = video_drvdata(file);
1156 	unsigned long req_events = poll_requested_events(pts);
1157 	unsigned int err = v4l2_ctrl_poll(file, pts);
1158 
1159 	if (req_events & (POLLIN | POLLRDNORM)) {
1160 		if (atomic_read(&radio->core->is_alive))
1161 			poll_wait(file, &radio->core->rds_read_queue, pts);
1162 
1163 		if (!atomic_read(&radio->core->is_alive))
1164 			err = POLLHUP;
1165 
1166 		if (!kfifo_is_empty(&radio->core->rds_fifo))
1167 			err = POLLIN | POLLRDNORM;
1168 	}
1169 
1170 	return err;
1171 }
1172 
1173 static const struct v4l2_file_operations si476x_fops = {
1174 	.owner			= THIS_MODULE,
1175 	.read			= si476x_radio_fops_read,
1176 	.poll			= si476x_radio_fops_poll,
1177 	.unlocked_ioctl		= video_ioctl2,
1178 	.open			= si476x_radio_fops_open,
1179 	.release		= si476x_radio_fops_release,
1180 };
1181 
1182 
1183 static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
1184 	.vidioc_querycap		= si476x_radio_querycap,
1185 	.vidioc_g_tuner			= si476x_radio_g_tuner,
1186 	.vidioc_s_tuner			= si476x_radio_s_tuner,
1187 
1188 	.vidioc_g_frequency		= si476x_radio_g_frequency,
1189 	.vidioc_s_frequency		= si476x_radio_s_frequency,
1190 	.vidioc_s_hw_freq_seek		= si476x_radio_s_hw_freq_seek,
1191 	.vidioc_enum_freq_bands		= si476x_radio_enum_freq_bands,
1192 
1193 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
1194 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
1195 
1196 #ifdef CONFIG_VIDEO_ADV_DEBUG
1197 	.vidioc_g_register		= si476x_radio_g_register,
1198 	.vidioc_s_register		= si476x_radio_s_register,
1199 #endif
1200 };
1201 
1202 
1203 static const struct video_device si476x_viddev_template = {
1204 	.fops			= &si476x_fops,
1205 	.name			= DRIVER_NAME,
1206 	.release		= video_device_release_empty,
1207 };
1208 
1209 
1210 
1211 static ssize_t si476x_radio_read_acf_blob(struct file *file,
1212 					  char __user *user_buf,
1213 					  size_t count, loff_t *ppos)
1214 {
1215 	int err;
1216 	struct si476x_radio *radio = file->private_data;
1217 	struct si476x_acf_status_report report;
1218 
1219 	si476x_core_lock(radio->core);
1220 	if (radio->ops->acf_status)
1221 		err = radio->ops->acf_status(radio->core, &report);
1222 	else
1223 		err = -ENOENT;
1224 	si476x_core_unlock(radio->core);
1225 
1226 	if (err < 0)
1227 		return err;
1228 
1229 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1230 				       sizeof(report));
1231 }
1232 
1233 static const struct file_operations radio_acf_fops = {
1234 	.open	= simple_open,
1235 	.llseek = default_llseek,
1236 	.read	= si476x_radio_read_acf_blob,
1237 };
1238 
1239 static ssize_t si476x_radio_read_rds_blckcnt_blob(struct file *file,
1240 						  char __user *user_buf,
1241 						  size_t count, loff_t *ppos)
1242 {
1243 	int err;
1244 	struct si476x_radio *radio = file->private_data;
1245 	struct si476x_rds_blockcount_report report;
1246 
1247 	si476x_core_lock(radio->core);
1248 	if (radio->ops->rds_blckcnt)
1249 		err = radio->ops->rds_blckcnt(radio->core, true,
1250 					       &report);
1251 	else
1252 		err = -ENOENT;
1253 	si476x_core_unlock(radio->core);
1254 
1255 	if (err < 0)
1256 		return err;
1257 
1258 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1259 				       sizeof(report));
1260 }
1261 
1262 static const struct file_operations radio_rds_blckcnt_fops = {
1263 	.open	= simple_open,
1264 	.llseek = default_llseek,
1265 	.read	= si476x_radio_read_rds_blckcnt_blob,
1266 };
1267 
1268 static ssize_t si476x_radio_read_agc_blob(struct file *file,
1269 					  char __user *user_buf,
1270 					  size_t count, loff_t *ppos)
1271 {
1272 	int err;
1273 	struct si476x_radio *radio = file->private_data;
1274 	struct si476x_agc_status_report report;
1275 
1276 	si476x_core_lock(radio->core);
1277 	if (radio->ops->rds_blckcnt)
1278 		err = radio->ops->agc_status(radio->core, &report);
1279 	else
1280 		err = -ENOENT;
1281 	si476x_core_unlock(radio->core);
1282 
1283 	if (err < 0)
1284 		return err;
1285 
1286 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1287 				       sizeof(report));
1288 }
1289 
1290 static const struct file_operations radio_agc_fops = {
1291 	.open	= simple_open,
1292 	.llseek = default_llseek,
1293 	.read	= si476x_radio_read_agc_blob,
1294 };
1295 
1296 static ssize_t si476x_radio_read_rsq_blob(struct file *file,
1297 					  char __user *user_buf,
1298 					  size_t count, loff_t *ppos)
1299 {
1300 	int err;
1301 	struct si476x_radio *radio = file->private_data;
1302 	struct si476x_rsq_status_report report;
1303 	struct si476x_rsq_status_args args = {
1304 		.primary	= false,
1305 		.rsqack		= false,
1306 		.attune		= false,
1307 		.cancel		= false,
1308 		.stcack		= false,
1309 	};
1310 
1311 	si476x_core_lock(radio->core);
1312 	if (radio->ops->rds_blckcnt)
1313 		err = radio->ops->rsq_status(radio->core, &args, &report);
1314 	else
1315 		err = -ENOENT;
1316 	si476x_core_unlock(radio->core);
1317 
1318 	if (err < 0)
1319 		return err;
1320 
1321 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1322 				       sizeof(report));
1323 }
1324 
1325 static const struct file_operations radio_rsq_fops = {
1326 	.open	= simple_open,
1327 	.llseek = default_llseek,
1328 	.read	= si476x_radio_read_rsq_blob,
1329 };
1330 
1331 static ssize_t si476x_radio_read_rsq_primary_blob(struct file *file,
1332 						  char __user *user_buf,
1333 						  size_t count, loff_t *ppos)
1334 {
1335 	int err;
1336 	struct si476x_radio *radio = file->private_data;
1337 	struct si476x_rsq_status_report report;
1338 	struct si476x_rsq_status_args args = {
1339 		.primary	= true,
1340 		.rsqack		= false,
1341 		.attune		= false,
1342 		.cancel		= false,
1343 		.stcack		= false,
1344 	};
1345 
1346 	si476x_core_lock(radio->core);
1347 	if (radio->ops->rds_blckcnt)
1348 		err = radio->ops->rsq_status(radio->core, &args, &report);
1349 	else
1350 		err = -ENOENT;
1351 	si476x_core_unlock(radio->core);
1352 
1353 	if (err < 0)
1354 		return err;
1355 
1356 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1357 				       sizeof(report));
1358 }
1359 
1360 static const struct file_operations radio_rsq_primary_fops = {
1361 	.open	= simple_open,
1362 	.llseek = default_llseek,
1363 	.read	= si476x_radio_read_rsq_primary_blob,
1364 };
1365 
1366 
1367 static int si476x_radio_init_debugfs(struct si476x_radio *radio)
1368 {
1369 	struct dentry	*dentry;
1370 	int		ret;
1371 
1372 	dentry = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
1373 	if (IS_ERR(dentry)) {
1374 		ret = PTR_ERR(dentry);
1375 		goto exit;
1376 	}
1377 	radio->debugfs = dentry;
1378 
1379 	dentry = debugfs_create_file("acf", S_IRUGO,
1380 				     radio->debugfs, radio, &radio_acf_fops);
1381 	if (IS_ERR(dentry)) {
1382 		ret = PTR_ERR(dentry);
1383 		goto cleanup;
1384 	}
1385 
1386 	dentry = debugfs_create_file("rds_blckcnt", S_IRUGO,
1387 				     radio->debugfs, radio,
1388 				     &radio_rds_blckcnt_fops);
1389 	if (IS_ERR(dentry)) {
1390 		ret = PTR_ERR(dentry);
1391 		goto cleanup;
1392 	}
1393 
1394 	dentry = debugfs_create_file("agc", S_IRUGO,
1395 				     radio->debugfs, radio, &radio_agc_fops);
1396 	if (IS_ERR(dentry)) {
1397 		ret = PTR_ERR(dentry);
1398 		goto cleanup;
1399 	}
1400 
1401 	dentry = debugfs_create_file("rsq", S_IRUGO,
1402 				     radio->debugfs, radio, &radio_rsq_fops);
1403 	if (IS_ERR(dentry)) {
1404 		ret = PTR_ERR(dentry);
1405 		goto cleanup;
1406 	}
1407 
1408 	dentry = debugfs_create_file("rsq_primary", S_IRUGO,
1409 				     radio->debugfs, radio,
1410 				     &radio_rsq_primary_fops);
1411 	if (IS_ERR(dentry)) {
1412 		ret = PTR_ERR(dentry);
1413 		goto cleanup;
1414 	}
1415 
1416 	return 0;
1417 cleanup:
1418 	debugfs_remove_recursive(radio->debugfs);
1419 exit:
1420 	return ret;
1421 }
1422 
1423 
1424 static int si476x_radio_add_new_custom(struct si476x_radio *radio,
1425 				       enum si476x_ctrl_idx idx)
1426 {
1427 	int rval;
1428 	struct v4l2_ctrl *ctrl;
1429 
1430 	ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
1431 				    &si476x_ctrls[idx],
1432 				    NULL);
1433 	rval = radio->ctrl_handler.error;
1434 	if (ctrl == NULL && rval)
1435 		dev_err(radio->v4l2dev.dev,
1436 			"Could not initialize '%s' control %d\n",
1437 			si476x_ctrls[idx].name, rval);
1438 
1439 	return rval;
1440 }
1441 
1442 static int si476x_radio_probe(struct platform_device *pdev)
1443 {
1444 	int rval;
1445 	struct si476x_radio *radio;
1446 	struct v4l2_ctrl *ctrl;
1447 
1448 	static atomic_t instance = ATOMIC_INIT(0);
1449 
1450 	radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
1451 	if (!radio)
1452 		return -ENOMEM;
1453 
1454 	radio->core = i2c_mfd_cell_to_core(&pdev->dev);
1455 
1456 	v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
1457 
1458 	rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
1459 	if (rval) {
1460 		dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
1461 		return rval;
1462 	}
1463 
1464 	memcpy(&radio->videodev, &si476x_viddev_template,
1465 	       sizeof(struct video_device));
1466 
1467 	radio->videodev.v4l2_dev  = &radio->v4l2dev;
1468 	radio->videodev.ioctl_ops = &si4761_ioctl_ops;
1469 
1470 	video_set_drvdata(&radio->videodev, radio);
1471 	platform_set_drvdata(pdev, radio);
1472 
1473 
1474 	radio->v4l2dev.ctrl_handler = &radio->ctrl_handler;
1475 	v4l2_ctrl_handler_init(&radio->ctrl_handler,
1476 			       1 + ARRAY_SIZE(si476x_ctrls));
1477 
1478 	if (si476x_core_has_am(radio->core)) {
1479 		ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1480 					      &si476x_ctrl_ops,
1481 					      V4L2_CID_POWER_LINE_FREQUENCY,
1482 					      V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
1483 					      0, 0);
1484 		rval = radio->ctrl_handler.error;
1485 		if (ctrl == NULL && rval) {
1486 			dev_err(&pdev->dev, "Could not initialize V4L2_CID_POWER_LINE_FREQUENCY control %d\n",
1487 				rval);
1488 			goto exit;
1489 		}
1490 
1491 		rval = si476x_radio_add_new_custom(radio,
1492 						   SI476X_IDX_HARMONICS_COUNT);
1493 		if (rval < 0)
1494 			goto exit;
1495 	}
1496 
1497 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RSSI_THRESHOLD);
1498 	if (rval < 0)
1499 		goto exit;
1500 
1501 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_SNR_THRESHOLD);
1502 	if (rval < 0)
1503 		goto exit;
1504 
1505 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_MAX_TUNE_ERROR);
1506 	if (rval < 0)
1507 		goto exit;
1508 
1509 	ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1510 				      &si476x_ctrl_ops,
1511 				      V4L2_CID_TUNE_DEEMPHASIS,
1512 				      V4L2_DEEMPHASIS_75_uS, 0, 0);
1513 	rval = radio->ctrl_handler.error;
1514 	if (ctrl == NULL && rval) {
1515 		dev_err(&pdev->dev, "Could not initialize V4L2_CID_TUNE_DEEMPHASIS control %d\n",
1516 			rval);
1517 		goto exit;
1518 	}
1519 
1520 	ctrl = v4l2_ctrl_new_std(&radio->ctrl_handler, &si476x_ctrl_ops,
1521 				 V4L2_CID_RDS_RECEPTION,
1522 				 0, 1, 1, 1);
1523 	rval = radio->ctrl_handler.error;
1524 	if (ctrl == NULL && rval) {
1525 		dev_err(&pdev->dev, "Could not initialize V4L2_CID_RDS_RECEPTION control %d\n",
1526 			rval);
1527 		goto exit;
1528 	}
1529 
1530 	if (si476x_core_has_diversity(radio->core)) {
1531 		si476x_ctrls[SI476X_IDX_DIVERSITY_MODE].def =
1532 			si476x_phase_diversity_mode_to_idx(radio->core->diversity_mode);
1533 		si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
1534 		if (rval < 0)
1535 			goto exit;
1536 
1537 		si476x_radio_add_new_custom(radio, SI476X_IDX_INTERCHIP_LINK);
1538 		if (rval < 0)
1539 			goto exit;
1540 	}
1541 
1542 	/* register video device */
1543 	rval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, -1);
1544 	if (rval < 0) {
1545 		dev_err(&pdev->dev, "Could not register video device\n");
1546 		goto exit;
1547 	}
1548 
1549 	rval = si476x_radio_init_debugfs(radio);
1550 	if (rval < 0) {
1551 		dev_err(&pdev->dev, "Could not creat debugfs interface\n");
1552 		goto exit;
1553 	}
1554 
1555 	return 0;
1556 exit:
1557 	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1558 	return rval;
1559 }
1560 
1561 static int si476x_radio_remove(struct platform_device *pdev)
1562 {
1563 	struct si476x_radio *radio = platform_get_drvdata(pdev);
1564 
1565 	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1566 	video_unregister_device(&radio->videodev);
1567 	v4l2_device_unregister(&radio->v4l2dev);
1568 	debugfs_remove_recursive(radio->debugfs);
1569 
1570 	return 0;
1571 }
1572 
1573 MODULE_ALIAS("platform:si476x-radio");
1574 
1575 static struct platform_driver si476x_radio_driver = {
1576 	.driver		= {
1577 		.name	= DRIVER_NAME,
1578 	},
1579 	.probe		= si476x_radio_probe,
1580 	.remove		= si476x_radio_remove,
1581 };
1582 module_platform_driver(si476x_radio_driver);
1583 
1584 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
1585 MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
1586 MODULE_LICENSE("GPL");
1587