1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/media/radio/radio-si476x.c -- V4L2 driver for SI476X chips
4  *
5  * Copyright (C) 2012 Innovative Converged Devices(ICD)
6  * Copyright (C) 2013 Andrey Smirnov
7  *
8  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
9  */
10 
11 #include <linux/module.h>
12 #include <linux/delay.h>
13 #include <linux/interrupt.h>
14 #include <linux/slab.h>
15 #include <linux/atomic.h>
16 #include <linux/videodev2.h>
17 #include <linux/mutex.h>
18 #include <linux/debugfs.h>
19 #include <media/v4l2-common.h>
20 #include <media/v4l2-ioctl.h>
21 #include <media/v4l2-ctrls.h>
22 #include <media/v4l2-event.h>
23 #include <media/v4l2-device.h>
24 
25 #include <media/drv-intf/si476x.h>
26 #include <linux/mfd/si476x-core.h>
27 
28 #define FM_FREQ_RANGE_LOW   64000000
29 #define FM_FREQ_RANGE_HIGH 108000000
30 
31 #define AM_FREQ_RANGE_LOW    520000
32 #define AM_FREQ_RANGE_HIGH 30000000
33 
34 #define PWRLINEFLTR (1 << 8)
35 
36 #define FREQ_MUL (10000000 / 625)
37 
38 #define SI476X_PHDIV_STATUS_LINK_LOCKED(status) (0x80 & (status))
39 
40 #define DRIVER_NAME "si476x-radio"
41 #define DRIVER_CARD "SI476x AM/FM Receiver"
42 
43 enum si476x_freq_bands {
44 	SI476X_BAND_FM,
45 	SI476X_BAND_AM,
46 };
47 
48 static const struct v4l2_frequency_band si476x_bands[] = {
49 	[SI476X_BAND_FM] = {
50 		.type		= V4L2_TUNER_RADIO,
51 		.index		= SI476X_BAND_FM,
52 		.capability	= V4L2_TUNER_CAP_LOW
53 		| V4L2_TUNER_CAP_STEREO
54 		| V4L2_TUNER_CAP_RDS
55 		| V4L2_TUNER_CAP_RDS_BLOCK_IO
56 		| V4L2_TUNER_CAP_FREQ_BANDS,
57 		.rangelow	=  64 * FREQ_MUL,
58 		.rangehigh	= 108 * FREQ_MUL,
59 		.modulation	= V4L2_BAND_MODULATION_FM,
60 	},
61 	[SI476X_BAND_AM] = {
62 		.type		= V4L2_TUNER_RADIO,
63 		.index		= SI476X_BAND_AM,
64 		.capability	= V4L2_TUNER_CAP_LOW
65 		| V4L2_TUNER_CAP_FREQ_BANDS,
66 		.rangelow	= 0.52 * FREQ_MUL,
67 		.rangehigh	= 30 * FREQ_MUL,
68 		.modulation	= V4L2_BAND_MODULATION_AM,
69 	},
70 };
71 
72 static inline bool si476x_radio_freq_is_inside_of_the_band(u32 freq, int band)
73 {
74 	return freq >= si476x_bands[band].rangelow &&
75 		freq <= si476x_bands[band].rangehigh;
76 }
77 
78 static inline bool si476x_radio_range_is_inside_of_the_band(u32 low, u32 high,
79 							    int band)
80 {
81 	return low  >= si476x_bands[band].rangelow &&
82 		high <= si476x_bands[band].rangehigh;
83 }
84 
85 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl);
86 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
87 
88 enum phase_diversity_modes_idx {
89 	SI476X_IDX_PHDIV_DISABLED,
90 	SI476X_IDX_PHDIV_PRIMARY_COMBINING,
91 	SI476X_IDX_PHDIV_PRIMARY_ANTENNA,
92 	SI476X_IDX_PHDIV_SECONDARY_ANTENNA,
93 	SI476X_IDX_PHDIV_SECONDARY_COMBINING,
94 };
95 
96 static const char * const phase_diversity_modes[] = {
97 	[SI476X_IDX_PHDIV_DISABLED]		= "Disabled",
98 	[SI476X_IDX_PHDIV_PRIMARY_COMBINING]	= "Primary with Secondary",
99 	[SI476X_IDX_PHDIV_PRIMARY_ANTENNA]	= "Primary Antenna",
100 	[SI476X_IDX_PHDIV_SECONDARY_ANTENNA]	= "Secondary Antenna",
101 	[SI476X_IDX_PHDIV_SECONDARY_COMBINING]	= "Secondary with Primary",
102 };
103 
104 static inline enum phase_diversity_modes_idx
105 si476x_phase_diversity_mode_to_idx(enum si476x_phase_diversity_mode mode)
106 {
107 	switch (mode) {
108 	default:
109 		fallthrough;
110 	case SI476X_PHDIV_DISABLED:
111 		return SI476X_IDX_PHDIV_DISABLED;
112 	case SI476X_PHDIV_PRIMARY_COMBINING:
113 		return SI476X_IDX_PHDIV_PRIMARY_COMBINING;
114 	case SI476X_PHDIV_PRIMARY_ANTENNA:
115 		return SI476X_IDX_PHDIV_PRIMARY_ANTENNA;
116 	case SI476X_PHDIV_SECONDARY_ANTENNA:
117 		return SI476X_IDX_PHDIV_SECONDARY_ANTENNA;
118 	case SI476X_PHDIV_SECONDARY_COMBINING:
119 		return SI476X_IDX_PHDIV_SECONDARY_COMBINING;
120 	}
121 }
122 
123 static inline enum si476x_phase_diversity_mode
124 si476x_phase_diversity_idx_to_mode(enum phase_diversity_modes_idx idx)
125 {
126 	static const int idx_to_value[] = {
127 		[SI476X_IDX_PHDIV_DISABLED]		= SI476X_PHDIV_DISABLED,
128 		[SI476X_IDX_PHDIV_PRIMARY_COMBINING]	= SI476X_PHDIV_PRIMARY_COMBINING,
129 		[SI476X_IDX_PHDIV_PRIMARY_ANTENNA]	= SI476X_PHDIV_PRIMARY_ANTENNA,
130 		[SI476X_IDX_PHDIV_SECONDARY_ANTENNA]	= SI476X_PHDIV_SECONDARY_ANTENNA,
131 		[SI476X_IDX_PHDIV_SECONDARY_COMBINING]	= SI476X_PHDIV_SECONDARY_COMBINING,
132 	};
133 
134 	return idx_to_value[idx];
135 }
136 
137 static const struct v4l2_ctrl_ops si476x_ctrl_ops = {
138 	.g_volatile_ctrl	= si476x_radio_g_volatile_ctrl,
139 	.s_ctrl			= si476x_radio_s_ctrl,
140 };
141 
142 
143 enum si476x_ctrl_idx {
144 	SI476X_IDX_RSSI_THRESHOLD,
145 	SI476X_IDX_SNR_THRESHOLD,
146 	SI476X_IDX_MAX_TUNE_ERROR,
147 	SI476X_IDX_HARMONICS_COUNT,
148 	SI476X_IDX_DIVERSITY_MODE,
149 	SI476X_IDX_INTERCHIP_LINK,
150 };
151 static struct v4l2_ctrl_config si476x_ctrls[] = {
152 
153 	/*
154 	 * SI476X during its station seeking(or tuning) process uses several
155 	 * parameters to determine if "the station" is valid:
156 	 *
157 	 *	- Signal's SNR(in dBuV) must be lower than
158 	 *	#V4L2_CID_SI476X_SNR_THRESHOLD
159 	 *	- Signal's RSSI(in dBuV) must be greater than
160 	 *	#V4L2_CID_SI476X_RSSI_THRESHOLD
161 	 *	- Signal's frequency deviation(in units of 2ppm) must not be
162 	 *	more than #V4L2_CID_SI476X_MAX_TUNE_ERROR
163 	 */
164 	[SI476X_IDX_RSSI_THRESHOLD] = {
165 		.ops	= &si476x_ctrl_ops,
166 		.id	= V4L2_CID_SI476X_RSSI_THRESHOLD,
167 		.name	= "Valid RSSI Threshold",
168 		.type	= V4L2_CTRL_TYPE_INTEGER,
169 		.min	= -128,
170 		.max	= 127,
171 		.step	= 1,
172 	},
173 	[SI476X_IDX_SNR_THRESHOLD] = {
174 		.ops	= &si476x_ctrl_ops,
175 		.id	= V4L2_CID_SI476X_SNR_THRESHOLD,
176 		.type	= V4L2_CTRL_TYPE_INTEGER,
177 		.name	= "Valid SNR Threshold",
178 		.min	= -128,
179 		.max	= 127,
180 		.step	= 1,
181 	},
182 	[SI476X_IDX_MAX_TUNE_ERROR] = {
183 		.ops	= &si476x_ctrl_ops,
184 		.id	= V4L2_CID_SI476X_MAX_TUNE_ERROR,
185 		.type	= V4L2_CTRL_TYPE_INTEGER,
186 		.name	= "Max Tune Errors",
187 		.min	= 0,
188 		.max	= 126 * 2,
189 		.step	= 2,
190 	},
191 
192 	/*
193 	 * #V4L2_CID_SI476X_HARMONICS_COUNT -- number of harmonics
194 	 * built-in power-line noise supression filter is to reject
195 	 * during AM-mode operation.
196 	 */
197 	[SI476X_IDX_HARMONICS_COUNT] = {
198 		.ops	= &si476x_ctrl_ops,
199 		.id	= V4L2_CID_SI476X_HARMONICS_COUNT,
200 		.type	= V4L2_CTRL_TYPE_INTEGER,
201 
202 		.name	= "Count of Harmonics to Reject",
203 		.min	= 0,
204 		.max	= 20,
205 		.step	= 1,
206 	},
207 
208 	/*
209 	 * #V4L2_CID_SI476X_DIVERSITY_MODE -- configuration which
210 	 * two tuners working in diversity mode are to work in.
211 	 *
212 	 *  - #SI476X_IDX_PHDIV_DISABLED diversity mode disabled
213 	 *  - #SI476X_IDX_PHDIV_PRIMARY_COMBINING diversity mode is
214 	 *  on, primary tuner's antenna is the main one.
215 	 *  - #SI476X_IDX_PHDIV_PRIMARY_ANTENNA diversity mode is
216 	 *  off, primary tuner's antenna is the main one.
217 	 *  - #SI476X_IDX_PHDIV_SECONDARY_ANTENNA diversity mode is
218 	 *  off, secondary tuner's antenna is the main one.
219 	 *  - #SI476X_IDX_PHDIV_SECONDARY_COMBINING diversity mode is
220 	 *  on, secondary tuner's antenna is the main one.
221 	 */
222 	[SI476X_IDX_DIVERSITY_MODE] = {
223 		.ops	= &si476x_ctrl_ops,
224 		.id	= V4L2_CID_SI476X_DIVERSITY_MODE,
225 		.type	= V4L2_CTRL_TYPE_MENU,
226 		.name	= "Phase Diversity Mode",
227 		.qmenu	= phase_diversity_modes,
228 		.min	= 0,
229 		.max	= ARRAY_SIZE(phase_diversity_modes) - 1,
230 	},
231 
232 	/*
233 	 * #V4L2_CID_SI476X_INTERCHIP_LINK -- inter-chip link in
234 	 * diversity mode indicator. Allows user to determine if two
235 	 * chips working in diversity mode have established a link
236 	 * between each other and if the system as a whole uses
237 	 * signals from both antennas to receive FM radio.
238 	 */
239 	[SI476X_IDX_INTERCHIP_LINK] = {
240 		.ops	= &si476x_ctrl_ops,
241 		.id	= V4L2_CID_SI476X_INTERCHIP_LINK,
242 		.type	= V4L2_CTRL_TYPE_BOOLEAN,
243 		.flags  = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_VOLATILE,
244 		.name	= "Inter-Chip Link",
245 		.min	= 0,
246 		.max	= 1,
247 		.step	= 1,
248 	},
249 };
250 
251 struct si476x_radio;
252 
253 /**
254  * struct si476x_radio_ops - vtable of tuner functions
255  *
256  * This table holds pointers to functions implementing particular
257  * operations depending on the mode in which the tuner chip was
258  * configured to start. If the function is not supported
259  * corresponding element is set to #NULL.
260  *
261  * @tune_freq: Tune chip to a specific frequency
262  * @seek_start: Star station seeking
263  * @rsq_status: Get Received Signal Quality(RSQ) status
264  * @rds_blckcnt: Get received RDS blocks count
265  * @phase_diversity: Change phase diversity mode of the tuner
266  * @phase_div_status: Get phase diversity mode status
267  * @acf_status: Get the status of Automatically Controlled
268  * Features(ACF)
269  * @agc_status: Get Automatic Gain Control(AGC) status
270  */
271 struct si476x_radio_ops {
272 	int (*tune_freq)(struct si476x_core *, struct si476x_tune_freq_args *);
273 	int (*seek_start)(struct si476x_core *, bool, bool);
274 	int (*rsq_status)(struct si476x_core *, struct si476x_rsq_status_args *,
275 			  struct si476x_rsq_status_report *);
276 	int (*rds_blckcnt)(struct si476x_core *, bool,
277 			   struct si476x_rds_blockcount_report *);
278 
279 	int (*phase_diversity)(struct si476x_core *,
280 			       enum si476x_phase_diversity_mode);
281 	int (*phase_div_status)(struct si476x_core *);
282 	int (*acf_status)(struct si476x_core *,
283 			  struct si476x_acf_status_report *);
284 	int (*agc_status)(struct si476x_core *,
285 			  struct si476x_agc_status_report *);
286 };
287 
288 /**
289  * struct si476x_radio - radio device
290  *
291  * @v4l2dev: Pointer to V4L2 device created by V4L2 subsystem
292  * @videodev: Pointer to video device created by V4L2 subsystem
293  * @ctrl_handler: V4L2 controls handler
294  * @core: Pointer to underlying core device
295  * @ops: Vtable of functions. See struct si476x_radio_ops for details
296  * @debugfs: pointer to &strucd dentry for debugfs
297  * @audmode: audio mode, as defined for the rxsubchans field
298  *	     at videodev2.h
299  *
300  * core structure is the radio device is being used
301  */
302 struct si476x_radio {
303 	struct v4l2_device v4l2dev;
304 	struct video_device videodev;
305 	struct v4l2_ctrl_handler ctrl_handler;
306 
307 	struct si476x_core  *core;
308 	/* This field should not be accesses unless core lock is held */
309 	const struct si476x_radio_ops *ops;
310 
311 	struct dentry	*debugfs;
312 	u32 audmode;
313 };
314 
315 static inline struct si476x_radio *
316 v4l2_dev_to_radio(struct v4l2_device *d)
317 {
318 	return container_of(d, struct si476x_radio, v4l2dev);
319 }
320 
321 static inline struct si476x_radio *
322 v4l2_ctrl_handler_to_radio(struct v4l2_ctrl_handler *d)
323 {
324 	return container_of(d, struct si476x_radio, ctrl_handler);
325 }
326 
327 /*
328  * si476x_vidioc_querycap - query device capabilities
329  */
330 static int si476x_radio_querycap(struct file *file, void *priv,
331 				 struct v4l2_capability *capability)
332 {
333 	struct si476x_radio *radio = video_drvdata(file);
334 
335 	strscpy(capability->driver, radio->v4l2dev.name,
336 		sizeof(capability->driver));
337 	strscpy(capability->card,   DRIVER_CARD, sizeof(capability->card));
338 	snprintf(capability->bus_info, sizeof(capability->bus_info),
339 		 "platform:%s", radio->v4l2dev.name);
340 	return 0;
341 }
342 
343 static int si476x_radio_enum_freq_bands(struct file *file, void *priv,
344 					struct v4l2_frequency_band *band)
345 {
346 	int err;
347 	struct si476x_radio *radio = video_drvdata(file);
348 
349 	if (band->tuner != 0)
350 		return -EINVAL;
351 
352 	switch (radio->core->chip_id) {
353 		/* AM/FM tuners -- all bands are supported */
354 	case SI476X_CHIP_SI4761:
355 	case SI476X_CHIP_SI4764:
356 		if (band->index < ARRAY_SIZE(si476x_bands)) {
357 			*band = si476x_bands[band->index];
358 			err = 0;
359 		} else {
360 			err = -EINVAL;
361 		}
362 		break;
363 		/* FM companion tuner chips -- only FM bands are
364 		 * supported */
365 	case SI476X_CHIP_SI4768:
366 		if (band->index == SI476X_BAND_FM) {
367 			*band = si476x_bands[band->index];
368 			err = 0;
369 		} else {
370 			err = -EINVAL;
371 		}
372 		break;
373 	default:
374 		err = -EINVAL;
375 	}
376 
377 	return err;
378 }
379 
380 static int si476x_radio_g_tuner(struct file *file, void *priv,
381 				struct v4l2_tuner *tuner)
382 {
383 	int err;
384 	struct si476x_rsq_status_report report;
385 	struct si476x_radio *radio = video_drvdata(file);
386 
387 	struct si476x_rsq_status_args args = {
388 		.primary	= false,
389 		.rsqack		= false,
390 		.attune		= false,
391 		.cancel		= false,
392 		.stcack		= false,
393 	};
394 
395 	if (tuner->index != 0)
396 		return -EINVAL;
397 
398 	tuner->type       = V4L2_TUNER_RADIO;
399 	tuner->capability = V4L2_TUNER_CAP_LOW /* Measure frequencies
400 						 * in multiples of
401 						 * 62.5 Hz */
402 		| V4L2_TUNER_CAP_STEREO
403 		| V4L2_TUNER_CAP_HWSEEK_BOUNDED
404 		| V4L2_TUNER_CAP_HWSEEK_WRAP
405 		| V4L2_TUNER_CAP_HWSEEK_PROG_LIM;
406 
407 	si476x_core_lock(radio->core);
408 
409 	if (si476x_core_is_a_secondary_tuner(radio->core)) {
410 		strscpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
411 		tuner->rxsubchans = 0;
412 		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
413 	} else if (si476x_core_has_am(radio->core)) {
414 		if (si476x_core_is_a_primary_tuner(radio->core))
415 			strscpy(tuner->name, "AM/FM (primary)",
416 				sizeof(tuner->name));
417 		else
418 			strscpy(tuner->name, "AM/FM", sizeof(tuner->name));
419 
420 		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO
421 			| V4L2_TUNER_SUB_RDS;
422 		tuner->capability |= V4L2_TUNER_CAP_RDS
423 			| V4L2_TUNER_CAP_RDS_BLOCK_IO
424 			| V4L2_TUNER_CAP_FREQ_BANDS;
425 
426 		tuner->rangelow = si476x_bands[SI476X_BAND_AM].rangelow;
427 	} else {
428 		strscpy(tuner->name, "FM", sizeof(tuner->name));
429 		tuner->rxsubchans = V4L2_TUNER_SUB_RDS;
430 		tuner->capability |= V4L2_TUNER_CAP_RDS
431 			| V4L2_TUNER_CAP_RDS_BLOCK_IO
432 			| V4L2_TUNER_CAP_FREQ_BANDS;
433 		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
434 	}
435 
436 	tuner->audmode = radio->audmode;
437 
438 	tuner->afc = 1;
439 	tuner->rangehigh = si476x_bands[SI476X_BAND_FM].rangehigh;
440 
441 	err = radio->ops->rsq_status(radio->core,
442 				     &args, &report);
443 	if (err < 0) {
444 		tuner->signal = 0;
445 	} else {
446 		/*
447 		 * tuner->signal value range: 0x0000 .. 0xFFFF,
448 		 * report.rssi: -128 .. 127
449 		 */
450 		tuner->signal = (report.rssi + 128) * 257;
451 	}
452 	si476x_core_unlock(radio->core);
453 
454 	return err;
455 }
456 
457 static int si476x_radio_s_tuner(struct file *file, void *priv,
458 				const struct v4l2_tuner *tuner)
459 {
460 	struct si476x_radio *radio = video_drvdata(file);
461 
462 	if (tuner->index != 0)
463 		return -EINVAL;
464 
465 	if (tuner->audmode == V4L2_TUNER_MODE_MONO ||
466 	    tuner->audmode == V4L2_TUNER_MODE_STEREO)
467 		radio->audmode = tuner->audmode;
468 	else
469 		radio->audmode = V4L2_TUNER_MODE_STEREO;
470 
471 	return 0;
472 }
473 
474 static int si476x_radio_init_vtable(struct si476x_radio *radio,
475 				    enum si476x_func func)
476 {
477 	static const struct si476x_radio_ops fm_ops = {
478 		.tune_freq		= si476x_core_cmd_fm_tune_freq,
479 		.seek_start		= si476x_core_cmd_fm_seek_start,
480 		.rsq_status		= si476x_core_cmd_fm_rsq_status,
481 		.rds_blckcnt		= si476x_core_cmd_fm_rds_blockcount,
482 		.phase_diversity	= si476x_core_cmd_fm_phase_diversity,
483 		.phase_div_status	= si476x_core_cmd_fm_phase_div_status,
484 		.acf_status		= si476x_core_cmd_fm_acf_status,
485 		.agc_status		= si476x_core_cmd_agc_status,
486 	};
487 
488 	static const struct si476x_radio_ops am_ops = {
489 		.tune_freq		= si476x_core_cmd_am_tune_freq,
490 		.seek_start		= si476x_core_cmd_am_seek_start,
491 		.rsq_status		= si476x_core_cmd_am_rsq_status,
492 		.rds_blckcnt		= NULL,
493 		.phase_diversity	= NULL,
494 		.phase_div_status	= NULL,
495 		.acf_status		= si476x_core_cmd_am_acf_status,
496 		.agc_status		= NULL,
497 	};
498 
499 	switch (func) {
500 	case SI476X_FUNC_FM_RECEIVER:
501 		radio->ops = &fm_ops;
502 		return 0;
503 
504 	case SI476X_FUNC_AM_RECEIVER:
505 		radio->ops = &am_ops;
506 		return 0;
507 	default:
508 		WARN(1, "Unexpected tuner function value\n");
509 		return -EINVAL;
510 	}
511 }
512 
513 static int si476x_radio_pretune(struct si476x_radio *radio,
514 				enum si476x_func func)
515 {
516 	int retval;
517 
518 	struct si476x_tune_freq_args args = {
519 		.zifsr		= false,
520 		.hd		= false,
521 		.injside	= SI476X_INJSIDE_AUTO,
522 		.tunemode	= SI476X_TM_VALIDATED_NORMAL_TUNE,
523 		.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO,
524 		.antcap		= 0,
525 	};
526 
527 	switch (func) {
528 	case SI476X_FUNC_FM_RECEIVER:
529 		args.freq = v4l2_to_si476x(radio->core,
530 					   92 * FREQ_MUL);
531 		retval = radio->ops->tune_freq(radio->core, &args);
532 		break;
533 	case SI476X_FUNC_AM_RECEIVER:
534 		args.freq = v4l2_to_si476x(radio->core,
535 					   0.6 * FREQ_MUL);
536 		retval = radio->ops->tune_freq(radio->core, &args);
537 		break;
538 	default:
539 		WARN(1, "Unexpected tuner function value\n");
540 		retval = -EINVAL;
541 	}
542 
543 	return retval;
544 }
545 static int si476x_radio_do_post_powerup_init(struct si476x_radio *radio,
546 					     enum si476x_func func)
547 {
548 	int err;
549 
550 	/* regcache_mark_dirty(radio->core->regmap); */
551 	err = regcache_sync_region(radio->core->regmap,
552 				   SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE,
553 				   SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT);
554 	if (err < 0)
555 		return err;
556 
557 	err = regcache_sync_region(radio->core->regmap,
558 				   SI476X_PROP_AUDIO_DEEMPHASIS,
559 				   SI476X_PROP_AUDIO_PWR_LINE_FILTER);
560 	if (err < 0)
561 		return err;
562 
563 	err = regcache_sync_region(radio->core->regmap,
564 				   SI476X_PROP_INT_CTL_ENABLE,
565 				   SI476X_PROP_INT_CTL_ENABLE);
566 	if (err < 0)
567 		return err;
568 
569 	/*
570 	 * Is there any point in restoring SNR and the like
571 	 * when switching between AM/FM?
572 	 */
573 	err = regcache_sync_region(radio->core->regmap,
574 				   SI476X_PROP_VALID_MAX_TUNE_ERROR,
575 				   SI476X_PROP_VALID_MAX_TUNE_ERROR);
576 	if (err < 0)
577 		return err;
578 
579 	err = regcache_sync_region(radio->core->regmap,
580 				   SI476X_PROP_VALID_SNR_THRESHOLD,
581 				   SI476X_PROP_VALID_RSSI_THRESHOLD);
582 	if (err < 0)
583 		return err;
584 
585 	if (func == SI476X_FUNC_FM_RECEIVER) {
586 		if (si476x_core_has_diversity(radio->core)) {
587 			err = si476x_core_cmd_fm_phase_diversity(radio->core,
588 								 radio->core->diversity_mode);
589 			if (err < 0)
590 				return err;
591 		}
592 
593 		err = regcache_sync_region(radio->core->regmap,
594 					   SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
595 					   SI476X_PROP_FM_RDS_CONFIG);
596 		if (err < 0)
597 			return err;
598 	}
599 
600 	return si476x_radio_init_vtable(radio, func);
601 
602 }
603 
604 static int si476x_radio_change_func(struct si476x_radio *radio,
605 				    enum si476x_func func)
606 {
607 	int err;
608 	bool soft;
609 	/*
610 	 * Since power/up down is a very time consuming operation,
611 	 * try to avoid doing it if the requested mode matches the one
612 	 * the tuner is in
613 	 */
614 	if (func == radio->core->power_up_parameters.func)
615 		return 0;
616 
617 	soft = true;
618 	err = si476x_core_stop(radio->core, soft);
619 	if (err < 0) {
620 		/*
621 		 * OK, if the chip does not want to play nice let's
622 		 * try to reset it in more brutal way
623 		 */
624 		soft = false;
625 		err = si476x_core_stop(radio->core, soft);
626 		if (err < 0)
627 			return err;
628 	}
629 	/*
630 	  Set the desired radio tuner function
631 	 */
632 	radio->core->power_up_parameters.func = func;
633 
634 	err = si476x_core_start(radio->core, soft);
635 	if (err < 0)
636 		return err;
637 
638 	/*
639 	 * No need to do the rest of manipulations for the bootlader
640 	 * mode
641 	 */
642 	if (func != SI476X_FUNC_FM_RECEIVER &&
643 	    func != SI476X_FUNC_AM_RECEIVER)
644 		return err;
645 
646 	return si476x_radio_do_post_powerup_init(radio, func);
647 }
648 
649 static int si476x_radio_g_frequency(struct file *file, void *priv,
650 			      struct v4l2_frequency *f)
651 {
652 	int err;
653 	struct si476x_radio *radio = video_drvdata(file);
654 
655 	if (f->tuner != 0 ||
656 	    f->type  != V4L2_TUNER_RADIO)
657 		return -EINVAL;
658 
659 	si476x_core_lock(radio->core);
660 
661 	if (radio->ops->rsq_status) {
662 		struct si476x_rsq_status_report report;
663 		struct si476x_rsq_status_args   args = {
664 			.primary	= false,
665 			.rsqack		= false,
666 			.attune		= true,
667 			.cancel		= false,
668 			.stcack		= false,
669 		};
670 
671 		err = radio->ops->rsq_status(radio->core, &args, &report);
672 		if (!err)
673 			f->frequency = si476x_to_v4l2(radio->core,
674 						      report.readfreq);
675 	} else {
676 		err = -EINVAL;
677 	}
678 
679 	si476x_core_unlock(radio->core);
680 
681 	return err;
682 }
683 
684 static int si476x_radio_s_frequency(struct file *file, void *priv,
685 				    const struct v4l2_frequency *f)
686 {
687 	int err;
688 	u32 freq = f->frequency;
689 	struct si476x_tune_freq_args args;
690 	struct si476x_radio *radio = video_drvdata(file);
691 
692 	const u32 midrange = (si476x_bands[SI476X_BAND_AM].rangehigh +
693 			      si476x_bands[SI476X_BAND_FM].rangelow) / 2;
694 	const int band = (freq > midrange) ?
695 		SI476X_BAND_FM : SI476X_BAND_AM;
696 	const enum si476x_func func = (band == SI476X_BAND_AM) ?
697 		SI476X_FUNC_AM_RECEIVER : SI476X_FUNC_FM_RECEIVER;
698 
699 	if (f->tuner != 0 ||
700 	    f->type  != V4L2_TUNER_RADIO)
701 		return -EINVAL;
702 
703 	si476x_core_lock(radio->core);
704 
705 	freq = clamp(freq,
706 		     si476x_bands[band].rangelow,
707 		     si476x_bands[band].rangehigh);
708 
709 	if (si476x_radio_freq_is_inside_of_the_band(freq,
710 						    SI476X_BAND_AM) &&
711 	    (!si476x_core_has_am(radio->core) ||
712 	     si476x_core_is_a_secondary_tuner(radio->core))) {
713 		err = -EINVAL;
714 		goto unlock;
715 	}
716 
717 	err = si476x_radio_change_func(radio, func);
718 	if (err < 0)
719 		goto unlock;
720 
721 	args.zifsr		= false;
722 	args.hd			= false;
723 	args.injside		= SI476X_INJSIDE_AUTO;
724 	args.freq		= v4l2_to_si476x(radio->core, freq);
725 	args.tunemode		= SI476X_TM_VALIDATED_NORMAL_TUNE;
726 	args.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO;
727 	args.antcap		= 0;
728 
729 	err = radio->ops->tune_freq(radio->core, &args);
730 
731 unlock:
732 	si476x_core_unlock(radio->core);
733 	return err;
734 }
735 
736 static int si476x_radio_s_hw_freq_seek(struct file *file, void *priv,
737 				       const struct v4l2_hw_freq_seek *seek)
738 {
739 	int err;
740 	enum si476x_func func;
741 	u32 rangelow = seek->rangelow, rangehigh = seek->rangehigh;
742 	struct si476x_radio *radio = video_drvdata(file);
743 
744 	if (file->f_flags & O_NONBLOCK)
745 		return -EAGAIN;
746 
747 	if (seek->tuner != 0 ||
748 	    seek->type  != V4L2_TUNER_RADIO)
749 		return -EINVAL;
750 
751 	si476x_core_lock(radio->core);
752 
753 	if (!rangelow) {
754 		err = regmap_read(radio->core->regmap,
755 				  SI476X_PROP_SEEK_BAND_BOTTOM,
756 				  &rangelow);
757 		if (err)
758 			goto unlock;
759 		rangelow = si476x_to_v4l2(radio->core, rangelow);
760 	}
761 	if (!rangehigh) {
762 		err = regmap_read(radio->core->regmap,
763 				  SI476X_PROP_SEEK_BAND_TOP,
764 				  &rangehigh);
765 		if (err)
766 			goto unlock;
767 		rangehigh = si476x_to_v4l2(radio->core, rangehigh);
768 	}
769 
770 	if (rangelow > rangehigh) {
771 		err = -EINVAL;
772 		goto unlock;
773 	}
774 
775 	if (si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
776 						     SI476X_BAND_FM)) {
777 		func = SI476X_FUNC_FM_RECEIVER;
778 
779 	} else if (si476x_core_has_am(radio->core) &&
780 		   si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
781 							    SI476X_BAND_AM)) {
782 		func = SI476X_FUNC_AM_RECEIVER;
783 	} else {
784 		err = -EINVAL;
785 		goto unlock;
786 	}
787 
788 	err = si476x_radio_change_func(radio, func);
789 	if (err < 0)
790 		goto unlock;
791 
792 	if (seek->rangehigh) {
793 		err = regmap_write(radio->core->regmap,
794 				   SI476X_PROP_SEEK_BAND_TOP,
795 				   v4l2_to_si476x(radio->core,
796 						  seek->rangehigh));
797 		if (err)
798 			goto unlock;
799 	}
800 	if (seek->rangelow) {
801 		err = regmap_write(radio->core->regmap,
802 				   SI476X_PROP_SEEK_BAND_BOTTOM,
803 				   v4l2_to_si476x(radio->core,
804 						  seek->rangelow));
805 		if (err)
806 			goto unlock;
807 	}
808 	if (seek->spacing) {
809 		err = regmap_write(radio->core->regmap,
810 				     SI476X_PROP_SEEK_FREQUENCY_SPACING,
811 				     v4l2_to_si476x(radio->core,
812 						    seek->spacing));
813 		if (err)
814 			goto unlock;
815 	}
816 
817 	err = radio->ops->seek_start(radio->core,
818 				     seek->seek_upward,
819 				     seek->wrap_around);
820 unlock:
821 	si476x_core_unlock(radio->core);
822 
823 
824 
825 	return err;
826 }
827 
828 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
829 {
830 	int retval;
831 	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
832 
833 	si476x_core_lock(radio->core);
834 
835 	switch (ctrl->id) {
836 	case V4L2_CID_SI476X_INTERCHIP_LINK:
837 		if (si476x_core_has_diversity(radio->core)) {
838 			if (radio->ops->phase_diversity) {
839 				retval = radio->ops->phase_div_status(radio->core);
840 				if (retval < 0)
841 					break;
842 
843 				ctrl->val = !!SI476X_PHDIV_STATUS_LINK_LOCKED(retval);
844 				retval = 0;
845 				break;
846 			} else {
847 				retval = -ENOTTY;
848 				break;
849 			}
850 		}
851 		retval = -EINVAL;
852 		break;
853 	default:
854 		retval = -EINVAL;
855 		break;
856 	}
857 	si476x_core_unlock(radio->core);
858 	return retval;
859 
860 }
861 
862 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl)
863 {
864 	int retval;
865 	enum si476x_phase_diversity_mode mode;
866 	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
867 
868 	si476x_core_lock(radio->core);
869 
870 	switch (ctrl->id) {
871 	case V4L2_CID_SI476X_HARMONICS_COUNT:
872 		retval = regmap_update_bits(radio->core->regmap,
873 					    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
874 					    SI476X_PROP_PWR_HARMONICS_MASK,
875 					    ctrl->val);
876 		break;
877 	case V4L2_CID_POWER_LINE_FREQUENCY:
878 		switch (ctrl->val) {
879 		case V4L2_CID_POWER_LINE_FREQUENCY_DISABLED:
880 			retval = regmap_update_bits(radio->core->regmap,
881 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
882 						    SI476X_PROP_PWR_ENABLE_MASK,
883 						    0);
884 			break;
885 		case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
886 			retval = regmap_update_bits(radio->core->regmap,
887 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
888 						    SI476X_PROP_PWR_GRID_MASK,
889 						    SI476X_PROP_PWR_GRID_50HZ);
890 			break;
891 		case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
892 			retval = regmap_update_bits(radio->core->regmap,
893 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
894 						    SI476X_PROP_PWR_GRID_MASK,
895 						    SI476X_PROP_PWR_GRID_60HZ);
896 			break;
897 		default:
898 			retval = -EINVAL;
899 			break;
900 		}
901 		break;
902 	case V4L2_CID_SI476X_RSSI_THRESHOLD:
903 		retval = regmap_write(radio->core->regmap,
904 				      SI476X_PROP_VALID_RSSI_THRESHOLD,
905 				      ctrl->val);
906 		break;
907 	case V4L2_CID_SI476X_SNR_THRESHOLD:
908 		retval = regmap_write(radio->core->regmap,
909 				      SI476X_PROP_VALID_SNR_THRESHOLD,
910 				      ctrl->val);
911 		break;
912 	case V4L2_CID_SI476X_MAX_TUNE_ERROR:
913 		retval = regmap_write(radio->core->regmap,
914 				      SI476X_PROP_VALID_MAX_TUNE_ERROR,
915 				      ctrl->val);
916 		break;
917 	case V4L2_CID_RDS_RECEPTION:
918 		/*
919 		 * It looks like RDS related properties are
920 		 * inaccessible when tuner is in AM mode, so cache the
921 		 * changes
922 		 */
923 		if (si476x_core_is_in_am_receiver_mode(radio->core))
924 			regcache_cache_only(radio->core->regmap, true);
925 
926 		if (ctrl->val) {
927 			retval = regmap_write(radio->core->regmap,
928 					      SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT,
929 					      radio->core->rds_fifo_depth);
930 			if (retval < 0)
931 				break;
932 
933 			if (radio->core->client->irq) {
934 				retval = regmap_write(radio->core->regmap,
935 						      SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
936 						      SI476X_RDSRECV);
937 				if (retval < 0)
938 					break;
939 			}
940 
941 			/* Drain RDS FIFO before enabling RDS processing */
942 			retval = si476x_core_cmd_fm_rds_status(radio->core,
943 							       false,
944 							       true,
945 							       true,
946 							       NULL);
947 			if (retval < 0)
948 				break;
949 
950 			retval = regmap_update_bits(radio->core->regmap,
951 						    SI476X_PROP_FM_RDS_CONFIG,
952 						    SI476X_PROP_RDSEN_MASK,
953 						    SI476X_PROP_RDSEN);
954 		} else {
955 			retval = regmap_update_bits(radio->core->regmap,
956 						    SI476X_PROP_FM_RDS_CONFIG,
957 						    SI476X_PROP_RDSEN_MASK,
958 						    !SI476X_PROP_RDSEN);
959 		}
960 
961 		if (si476x_core_is_in_am_receiver_mode(radio->core))
962 			regcache_cache_only(radio->core->regmap, false);
963 		break;
964 	case V4L2_CID_TUNE_DEEMPHASIS:
965 		retval = regmap_write(radio->core->regmap,
966 				      SI476X_PROP_AUDIO_DEEMPHASIS,
967 				      ctrl->val);
968 		break;
969 
970 	case V4L2_CID_SI476X_DIVERSITY_MODE:
971 		mode = si476x_phase_diversity_idx_to_mode(ctrl->val);
972 
973 		if (mode == radio->core->diversity_mode) {
974 			retval = 0;
975 			break;
976 		}
977 
978 		if (si476x_core_is_in_am_receiver_mode(radio->core)) {
979 			/*
980 			 * Diversity cannot be configured while tuner
981 			 * is in AM mode so save the changes and carry on.
982 			 */
983 			radio->core->diversity_mode = mode;
984 			retval = 0;
985 		} else {
986 			retval = radio->ops->phase_diversity(radio->core, mode);
987 			if (!retval)
988 				radio->core->diversity_mode = mode;
989 		}
990 		break;
991 
992 	default:
993 		retval = -EINVAL;
994 		break;
995 	}
996 
997 	si476x_core_unlock(radio->core);
998 
999 	return retval;
1000 }
1001 
1002 #ifdef CONFIG_VIDEO_ADV_DEBUG
1003 static int si476x_radio_g_register(struct file *file, void *fh,
1004 				   struct v4l2_dbg_register *reg)
1005 {
1006 	int err;
1007 	unsigned int value;
1008 	struct si476x_radio *radio = video_drvdata(file);
1009 
1010 	si476x_core_lock(radio->core);
1011 	reg->size = 2;
1012 	err = regmap_read(radio->core->regmap,
1013 			  (unsigned int)reg->reg, &value);
1014 	reg->val = value;
1015 	si476x_core_unlock(radio->core);
1016 
1017 	return err;
1018 }
1019 static int si476x_radio_s_register(struct file *file, void *fh,
1020 				   const struct v4l2_dbg_register *reg)
1021 {
1022 
1023 	int err;
1024 	struct si476x_radio *radio = video_drvdata(file);
1025 
1026 	si476x_core_lock(radio->core);
1027 	err = regmap_write(radio->core->regmap,
1028 			   (unsigned int)reg->reg,
1029 			   (unsigned int)reg->val);
1030 	si476x_core_unlock(radio->core);
1031 
1032 	return err;
1033 }
1034 #endif
1035 
1036 static int si476x_radio_fops_open(struct file *file)
1037 {
1038 	struct si476x_radio *radio = video_drvdata(file);
1039 	int err;
1040 
1041 	err = v4l2_fh_open(file);
1042 	if (err)
1043 		return err;
1044 
1045 	if (v4l2_fh_is_singular_file(file)) {
1046 		si476x_core_lock(radio->core);
1047 		err = si476x_core_set_power_state(radio->core,
1048 						  SI476X_POWER_UP_FULL);
1049 		if (err < 0)
1050 			goto done;
1051 
1052 		err = si476x_radio_do_post_powerup_init(radio,
1053 							radio->core->power_up_parameters.func);
1054 		if (err < 0)
1055 			goto power_down;
1056 
1057 		err = si476x_radio_pretune(radio,
1058 					   radio->core->power_up_parameters.func);
1059 		if (err < 0)
1060 			goto power_down;
1061 
1062 		si476x_core_unlock(radio->core);
1063 		/*Must be done after si476x_core_unlock to prevent a deadlock*/
1064 		v4l2_ctrl_handler_setup(&radio->ctrl_handler);
1065 	}
1066 
1067 	return err;
1068 
1069 power_down:
1070 	si476x_core_set_power_state(radio->core,
1071 				    SI476X_POWER_DOWN);
1072 done:
1073 	si476x_core_unlock(radio->core);
1074 	v4l2_fh_release(file);
1075 
1076 	return err;
1077 }
1078 
1079 static int si476x_radio_fops_release(struct file *file)
1080 {
1081 	int err;
1082 	struct si476x_radio *radio = video_drvdata(file);
1083 
1084 	if (v4l2_fh_is_singular_file(file) &&
1085 	    atomic_read(&radio->core->is_alive))
1086 		si476x_core_set_power_state(radio->core,
1087 					    SI476X_POWER_DOWN);
1088 
1089 	err = v4l2_fh_release(file);
1090 
1091 	return err;
1092 }
1093 
1094 static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
1095 				      size_t count, loff_t *ppos)
1096 {
1097 	ssize_t      rval;
1098 	size_t       fifo_len;
1099 	unsigned int copied;
1100 
1101 	struct si476x_radio *radio = video_drvdata(file);
1102 
1103 	/* block if no new data available */
1104 	if (kfifo_is_empty(&radio->core->rds_fifo)) {
1105 		if (file->f_flags & O_NONBLOCK)
1106 			return -EWOULDBLOCK;
1107 
1108 		rval = wait_event_interruptible(radio->core->rds_read_queue,
1109 						(!kfifo_is_empty(&radio->core->rds_fifo) ||
1110 						 !atomic_read(&radio->core->is_alive)));
1111 		if (rval < 0)
1112 			return -EINTR;
1113 
1114 		if (!atomic_read(&radio->core->is_alive))
1115 			return -ENODEV;
1116 	}
1117 
1118 	fifo_len = kfifo_len(&radio->core->rds_fifo);
1119 
1120 	if (kfifo_to_user(&radio->core->rds_fifo, buf,
1121 			  min(fifo_len, count),
1122 			  &copied) != 0) {
1123 		dev_warn(&radio->videodev.dev,
1124 			 "Error during FIFO to userspace copy\n");
1125 		rval = -EIO;
1126 	} else {
1127 		rval = (ssize_t)copied;
1128 	}
1129 
1130 	return rval;
1131 }
1132 
1133 static __poll_t si476x_radio_fops_poll(struct file *file,
1134 				struct poll_table_struct *pts)
1135 {
1136 	struct si476x_radio *radio = video_drvdata(file);
1137 	__poll_t req_events = poll_requested_events(pts);
1138 	__poll_t err = v4l2_ctrl_poll(file, pts);
1139 
1140 	if (req_events & (EPOLLIN | EPOLLRDNORM)) {
1141 		if (atomic_read(&radio->core->is_alive))
1142 			poll_wait(file, &radio->core->rds_read_queue, pts);
1143 
1144 		if (!atomic_read(&radio->core->is_alive))
1145 			err = EPOLLHUP;
1146 
1147 		if (!kfifo_is_empty(&radio->core->rds_fifo))
1148 			err = EPOLLIN | EPOLLRDNORM;
1149 	}
1150 
1151 	return err;
1152 }
1153 
1154 static const struct v4l2_file_operations si476x_fops = {
1155 	.owner			= THIS_MODULE,
1156 	.read			= si476x_radio_fops_read,
1157 	.poll			= si476x_radio_fops_poll,
1158 	.unlocked_ioctl		= video_ioctl2,
1159 	.open			= si476x_radio_fops_open,
1160 	.release		= si476x_radio_fops_release,
1161 };
1162 
1163 
1164 static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
1165 	.vidioc_querycap		= si476x_radio_querycap,
1166 	.vidioc_g_tuner			= si476x_radio_g_tuner,
1167 	.vidioc_s_tuner			= si476x_radio_s_tuner,
1168 
1169 	.vidioc_g_frequency		= si476x_radio_g_frequency,
1170 	.vidioc_s_frequency		= si476x_radio_s_frequency,
1171 	.vidioc_s_hw_freq_seek		= si476x_radio_s_hw_freq_seek,
1172 	.vidioc_enum_freq_bands		= si476x_radio_enum_freq_bands,
1173 
1174 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
1175 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
1176 
1177 #ifdef CONFIG_VIDEO_ADV_DEBUG
1178 	.vidioc_g_register		= si476x_radio_g_register,
1179 	.vidioc_s_register		= si476x_radio_s_register,
1180 #endif
1181 };
1182 
1183 
1184 static const struct video_device si476x_viddev_template = {
1185 	.fops			= &si476x_fops,
1186 	.name			= DRIVER_NAME,
1187 	.release		= video_device_release_empty,
1188 };
1189 
1190 
1191 
1192 static ssize_t si476x_radio_read_acf_blob(struct file *file,
1193 					  char __user *user_buf,
1194 					  size_t count, loff_t *ppos)
1195 {
1196 	int err;
1197 	struct si476x_radio *radio = file->private_data;
1198 	struct si476x_acf_status_report report;
1199 
1200 	si476x_core_lock(radio->core);
1201 	if (radio->ops->acf_status)
1202 		err = radio->ops->acf_status(radio->core, &report);
1203 	else
1204 		err = -ENOENT;
1205 	si476x_core_unlock(radio->core);
1206 
1207 	if (err < 0)
1208 		return err;
1209 
1210 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1211 				       sizeof(report));
1212 }
1213 
1214 static const struct file_operations radio_acf_fops = {
1215 	.open	= simple_open,
1216 	.llseek = default_llseek,
1217 	.read	= si476x_radio_read_acf_blob,
1218 };
1219 
1220 static ssize_t si476x_radio_read_rds_blckcnt_blob(struct file *file,
1221 						  char __user *user_buf,
1222 						  size_t count, loff_t *ppos)
1223 {
1224 	int err;
1225 	struct si476x_radio *radio = file->private_data;
1226 	struct si476x_rds_blockcount_report report;
1227 
1228 	si476x_core_lock(radio->core);
1229 	if (radio->ops->rds_blckcnt)
1230 		err = radio->ops->rds_blckcnt(radio->core, true,
1231 					       &report);
1232 	else
1233 		err = -ENOENT;
1234 	si476x_core_unlock(radio->core);
1235 
1236 	if (err < 0)
1237 		return err;
1238 
1239 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1240 				       sizeof(report));
1241 }
1242 
1243 static const struct file_operations radio_rds_blckcnt_fops = {
1244 	.open	= simple_open,
1245 	.llseek = default_llseek,
1246 	.read	= si476x_radio_read_rds_blckcnt_blob,
1247 };
1248 
1249 static ssize_t si476x_radio_read_agc_blob(struct file *file,
1250 					  char __user *user_buf,
1251 					  size_t count, loff_t *ppos)
1252 {
1253 	int err;
1254 	struct si476x_radio *radio = file->private_data;
1255 	struct si476x_agc_status_report report;
1256 
1257 	si476x_core_lock(radio->core);
1258 	if (radio->ops->rds_blckcnt)
1259 		err = radio->ops->agc_status(radio->core, &report);
1260 	else
1261 		err = -ENOENT;
1262 	si476x_core_unlock(radio->core);
1263 
1264 	if (err < 0)
1265 		return err;
1266 
1267 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1268 				       sizeof(report));
1269 }
1270 
1271 static const struct file_operations radio_agc_fops = {
1272 	.open	= simple_open,
1273 	.llseek = default_llseek,
1274 	.read	= si476x_radio_read_agc_blob,
1275 };
1276 
1277 static ssize_t si476x_radio_read_rsq_blob(struct file *file,
1278 					  char __user *user_buf,
1279 					  size_t count, loff_t *ppos)
1280 {
1281 	int err;
1282 	struct si476x_radio *radio = file->private_data;
1283 	struct si476x_rsq_status_report report;
1284 	struct si476x_rsq_status_args args = {
1285 		.primary	= false,
1286 		.rsqack		= false,
1287 		.attune		= false,
1288 		.cancel		= false,
1289 		.stcack		= false,
1290 	};
1291 
1292 	si476x_core_lock(radio->core);
1293 	if (radio->ops->rds_blckcnt)
1294 		err = radio->ops->rsq_status(radio->core, &args, &report);
1295 	else
1296 		err = -ENOENT;
1297 	si476x_core_unlock(radio->core);
1298 
1299 	if (err < 0)
1300 		return err;
1301 
1302 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1303 				       sizeof(report));
1304 }
1305 
1306 static const struct file_operations radio_rsq_fops = {
1307 	.open	= simple_open,
1308 	.llseek = default_llseek,
1309 	.read	= si476x_radio_read_rsq_blob,
1310 };
1311 
1312 static ssize_t si476x_radio_read_rsq_primary_blob(struct file *file,
1313 						  char __user *user_buf,
1314 						  size_t count, loff_t *ppos)
1315 {
1316 	int err;
1317 	struct si476x_radio *radio = file->private_data;
1318 	struct si476x_rsq_status_report report;
1319 	struct si476x_rsq_status_args args = {
1320 		.primary	= true,
1321 		.rsqack		= false,
1322 		.attune		= false,
1323 		.cancel		= false,
1324 		.stcack		= false,
1325 	};
1326 
1327 	si476x_core_lock(radio->core);
1328 	if (radio->ops->rds_blckcnt)
1329 		err = radio->ops->rsq_status(radio->core, &args, &report);
1330 	else
1331 		err = -ENOENT;
1332 	si476x_core_unlock(radio->core);
1333 
1334 	if (err < 0)
1335 		return err;
1336 
1337 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1338 				       sizeof(report));
1339 }
1340 
1341 static const struct file_operations radio_rsq_primary_fops = {
1342 	.open	= simple_open,
1343 	.llseek = default_llseek,
1344 	.read	= si476x_radio_read_rsq_primary_blob,
1345 };
1346 
1347 
1348 static void si476x_radio_init_debugfs(struct si476x_radio *radio)
1349 {
1350 	radio->debugfs = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
1351 
1352 	debugfs_create_file("acf", S_IRUGO, radio->debugfs, radio,
1353 			    &radio_acf_fops);
1354 
1355 	debugfs_create_file("rds_blckcnt", S_IRUGO, radio->debugfs, radio,
1356 			    &radio_rds_blckcnt_fops);
1357 
1358 	debugfs_create_file("agc", S_IRUGO, radio->debugfs, radio,
1359 			    &radio_agc_fops);
1360 
1361 	debugfs_create_file("rsq", S_IRUGO, radio->debugfs, radio,
1362 			    &radio_rsq_fops);
1363 
1364 	debugfs_create_file("rsq_primary", S_IRUGO, radio->debugfs, radio,
1365 			    &radio_rsq_primary_fops);
1366 }
1367 
1368 
1369 static int si476x_radio_add_new_custom(struct si476x_radio *radio,
1370 				       enum si476x_ctrl_idx idx)
1371 {
1372 	int rval;
1373 	struct v4l2_ctrl *ctrl;
1374 
1375 	ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
1376 				    &si476x_ctrls[idx],
1377 				    NULL);
1378 	rval = radio->ctrl_handler.error;
1379 	if (ctrl == NULL && rval)
1380 		dev_err(radio->v4l2dev.dev,
1381 			"Could not initialize '%s' control %d\n",
1382 			si476x_ctrls[idx].name, rval);
1383 
1384 	return rval;
1385 }
1386 
1387 static int si476x_radio_probe(struct platform_device *pdev)
1388 {
1389 	int rval;
1390 	struct si476x_radio *radio;
1391 	struct v4l2_ctrl *ctrl;
1392 
1393 	static atomic_t instance = ATOMIC_INIT(0);
1394 
1395 	radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
1396 	if (!radio)
1397 		return -ENOMEM;
1398 
1399 	radio->core = i2c_mfd_cell_to_core(&pdev->dev);
1400 
1401 	v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
1402 
1403 	rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
1404 	if (rval) {
1405 		dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
1406 		return rval;
1407 	}
1408 
1409 	memcpy(&radio->videodev, &si476x_viddev_template,
1410 	       sizeof(struct video_device));
1411 
1412 	radio->videodev.v4l2_dev  = &radio->v4l2dev;
1413 	radio->videodev.ioctl_ops = &si4761_ioctl_ops;
1414 	radio->videodev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
1415 				      V4L2_CAP_HW_FREQ_SEEK;
1416 
1417 	si476x_core_lock(radio->core);
1418 	if (!si476x_core_is_a_secondary_tuner(radio->core))
1419 		radio->videodev.device_caps |= V4L2_CAP_RDS_CAPTURE |
1420 					       V4L2_CAP_READWRITE;
1421 	si476x_core_unlock(radio->core);
1422 
1423 	video_set_drvdata(&radio->videodev, radio);
1424 	platform_set_drvdata(pdev, radio);
1425 
1426 
1427 	radio->v4l2dev.ctrl_handler = &radio->ctrl_handler;
1428 	v4l2_ctrl_handler_init(&radio->ctrl_handler,
1429 			       1 + ARRAY_SIZE(si476x_ctrls));
1430 
1431 	if (si476x_core_has_am(radio->core)) {
1432 		ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1433 					      &si476x_ctrl_ops,
1434 					      V4L2_CID_POWER_LINE_FREQUENCY,
1435 					      V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
1436 					      0, 0);
1437 		rval = radio->ctrl_handler.error;
1438 		if (ctrl == NULL && rval) {
1439 			dev_err(&pdev->dev, "Could not initialize V4L2_CID_POWER_LINE_FREQUENCY control %d\n",
1440 				rval);
1441 			goto exit;
1442 		}
1443 
1444 		rval = si476x_radio_add_new_custom(radio,
1445 						   SI476X_IDX_HARMONICS_COUNT);
1446 		if (rval < 0)
1447 			goto exit;
1448 	}
1449 
1450 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RSSI_THRESHOLD);
1451 	if (rval < 0)
1452 		goto exit;
1453 
1454 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_SNR_THRESHOLD);
1455 	if (rval < 0)
1456 		goto exit;
1457 
1458 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_MAX_TUNE_ERROR);
1459 	if (rval < 0)
1460 		goto exit;
1461 
1462 	ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1463 				      &si476x_ctrl_ops,
1464 				      V4L2_CID_TUNE_DEEMPHASIS,
1465 				      V4L2_DEEMPHASIS_75_uS, 0, 0);
1466 	rval = radio->ctrl_handler.error;
1467 	if (ctrl == NULL && rval) {
1468 		dev_err(&pdev->dev, "Could not initialize V4L2_CID_TUNE_DEEMPHASIS control %d\n",
1469 			rval);
1470 		goto exit;
1471 	}
1472 
1473 	ctrl = v4l2_ctrl_new_std(&radio->ctrl_handler, &si476x_ctrl_ops,
1474 				 V4L2_CID_RDS_RECEPTION,
1475 				 0, 1, 1, 1);
1476 	rval = radio->ctrl_handler.error;
1477 	if (ctrl == NULL && rval) {
1478 		dev_err(&pdev->dev, "Could not initialize V4L2_CID_RDS_RECEPTION control %d\n",
1479 			rval);
1480 		goto exit;
1481 	}
1482 
1483 	if (si476x_core_has_diversity(radio->core)) {
1484 		si476x_ctrls[SI476X_IDX_DIVERSITY_MODE].def =
1485 			si476x_phase_diversity_mode_to_idx(radio->core->diversity_mode);
1486 		rval = si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
1487 		if (rval < 0)
1488 			goto exit;
1489 
1490 		rval = si476x_radio_add_new_custom(radio, SI476X_IDX_INTERCHIP_LINK);
1491 		if (rval < 0)
1492 			goto exit;
1493 	}
1494 
1495 	/* register video device */
1496 	rval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, -1);
1497 	if (rval < 0) {
1498 		dev_err(&pdev->dev, "Could not register video device\n");
1499 		goto exit;
1500 	}
1501 
1502 	si476x_radio_init_debugfs(radio);
1503 
1504 	return 0;
1505 exit:
1506 	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1507 	return rval;
1508 }
1509 
1510 static int si476x_radio_remove(struct platform_device *pdev)
1511 {
1512 	struct si476x_radio *radio = platform_get_drvdata(pdev);
1513 
1514 	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1515 	video_unregister_device(&radio->videodev);
1516 	v4l2_device_unregister(&radio->v4l2dev);
1517 	debugfs_remove_recursive(radio->debugfs);
1518 
1519 	return 0;
1520 }
1521 
1522 MODULE_ALIAS("platform:si476x-radio");
1523 
1524 static struct platform_driver si476x_radio_driver = {
1525 	.driver		= {
1526 		.name	= DRIVER_NAME,
1527 	},
1528 	.probe		= si476x_radio_probe,
1529 	.remove		= si476x_radio_remove,
1530 };
1531 module_platform_driver(si476x_radio_driver);
1532 
1533 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
1534 MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
1535 MODULE_LICENSE("GPL");
1536