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/drv-intf/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  * @v4l2dev: Pointer to V4L2 device created by V4L2 subsystem
300  * @videodev: Pointer to video device created by V4L2 subsystem
301  * @ctrl_handler: V4L2 controls handler
302  * @core: Pointer to underlying core device
303  * @ops: Vtable of functions. See struct si476x_radio_ops for details
304  * @debugfs: pointer to &strucd dentry for debugfs
305  * @audmode: audio mode, as defined for the rxsubchans field
306  *	     at videodev2.h
307  *
308  * core structure is the radio device is being used
309  */
310 struct si476x_radio {
311 	struct v4l2_device v4l2dev;
312 	struct video_device videodev;
313 	struct v4l2_ctrl_handler ctrl_handler;
314 
315 	struct si476x_core  *core;
316 	/* This field should not be accesses unless core lock is held */
317 	const struct si476x_radio_ops *ops;
318 
319 	struct dentry	*debugfs;
320 	u32 audmode;
321 };
322 
323 static inline struct si476x_radio *
324 v4l2_dev_to_radio(struct v4l2_device *d)
325 {
326 	return container_of(d, struct si476x_radio, v4l2dev);
327 }
328 
329 static inline struct si476x_radio *
330 v4l2_ctrl_handler_to_radio(struct v4l2_ctrl_handler *d)
331 {
332 	return container_of(d, struct si476x_radio, ctrl_handler);
333 }
334 
335 /*
336  * si476x_vidioc_querycap - query device capabilities
337  */
338 static int si476x_radio_querycap(struct file *file, void *priv,
339 				 struct v4l2_capability *capability)
340 {
341 	struct si476x_radio *radio = video_drvdata(file);
342 
343 	strlcpy(capability->driver, radio->v4l2dev.name,
344 		sizeof(capability->driver));
345 	strlcpy(capability->card,   DRIVER_CARD, sizeof(capability->card));
346 	snprintf(capability->bus_info, sizeof(capability->bus_info),
347 		 "platform:%s", radio->v4l2dev.name);
348 
349 	capability->device_caps = V4L2_CAP_TUNER
350 		| V4L2_CAP_RADIO
351 		| V4L2_CAP_HW_FREQ_SEEK;
352 
353 	si476x_core_lock(radio->core);
354 	if (!si476x_core_is_a_secondary_tuner(radio->core))
355 		capability->device_caps |= V4L2_CAP_RDS_CAPTURE
356 			| V4L2_CAP_READWRITE;
357 	si476x_core_unlock(radio->core);
358 
359 	capability->capabilities = capability->device_caps
360 		| V4L2_CAP_DEVICE_CAPS;
361 	return 0;
362 }
363 
364 static int si476x_radio_enum_freq_bands(struct file *file, void *priv,
365 					struct v4l2_frequency_band *band)
366 {
367 	int err;
368 	struct si476x_radio *radio = video_drvdata(file);
369 
370 	if (band->tuner != 0)
371 		return -EINVAL;
372 
373 	switch (radio->core->chip_id) {
374 		/* AM/FM tuners -- all bands are supported */
375 	case SI476X_CHIP_SI4761:
376 	case SI476X_CHIP_SI4764:
377 		if (band->index < ARRAY_SIZE(si476x_bands)) {
378 			*band = si476x_bands[band->index];
379 			err = 0;
380 		} else {
381 			err = -EINVAL;
382 		}
383 		break;
384 		/* FM companion tuner chips -- only FM bands are
385 		 * supported */
386 	case SI476X_CHIP_SI4768:
387 		if (band->index == SI476X_BAND_FM) {
388 			*band = si476x_bands[band->index];
389 			err = 0;
390 		} else {
391 			err = -EINVAL;
392 		}
393 		break;
394 	default:
395 		err = -EINVAL;
396 	}
397 
398 	return err;
399 }
400 
401 static int si476x_radio_g_tuner(struct file *file, void *priv,
402 				struct v4l2_tuner *tuner)
403 {
404 	int err;
405 	struct si476x_rsq_status_report report;
406 	struct si476x_radio *radio = video_drvdata(file);
407 
408 	struct si476x_rsq_status_args args = {
409 		.primary	= false,
410 		.rsqack		= false,
411 		.attune		= false,
412 		.cancel		= false,
413 		.stcack		= false,
414 	};
415 
416 	if (tuner->index != 0)
417 		return -EINVAL;
418 
419 	tuner->type       = V4L2_TUNER_RADIO;
420 	tuner->capability = V4L2_TUNER_CAP_LOW /* Measure frequencies
421 						 * in multiples of
422 						 * 62.5 Hz */
423 		| V4L2_TUNER_CAP_STEREO
424 		| V4L2_TUNER_CAP_HWSEEK_BOUNDED
425 		| V4L2_TUNER_CAP_HWSEEK_WRAP
426 		| V4L2_TUNER_CAP_HWSEEK_PROG_LIM;
427 
428 	si476x_core_lock(radio->core);
429 
430 	if (si476x_core_is_a_secondary_tuner(radio->core)) {
431 		strlcpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
432 		tuner->rxsubchans = 0;
433 		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
434 	} else if (si476x_core_has_am(radio->core)) {
435 		if (si476x_core_is_a_primary_tuner(radio->core))
436 			strlcpy(tuner->name, "AM/FM (primary)",
437 				sizeof(tuner->name));
438 		else
439 			strlcpy(tuner->name, "AM/FM", sizeof(tuner->name));
440 
441 		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO
442 			| V4L2_TUNER_SUB_RDS;
443 		tuner->capability |= V4L2_TUNER_CAP_RDS
444 			| V4L2_TUNER_CAP_RDS_BLOCK_IO
445 			| V4L2_TUNER_CAP_FREQ_BANDS;
446 
447 		tuner->rangelow = si476x_bands[SI476X_BAND_AM].rangelow;
448 	} else {
449 		strlcpy(tuner->name, "FM", sizeof(tuner->name));
450 		tuner->rxsubchans = V4L2_TUNER_SUB_RDS;
451 		tuner->capability |= V4L2_TUNER_CAP_RDS
452 			| V4L2_TUNER_CAP_RDS_BLOCK_IO
453 			| V4L2_TUNER_CAP_FREQ_BANDS;
454 		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
455 	}
456 
457 	tuner->audmode = radio->audmode;
458 
459 	tuner->afc = 1;
460 	tuner->rangehigh = si476x_bands[SI476X_BAND_FM].rangehigh;
461 
462 	err = radio->ops->rsq_status(radio->core,
463 				     &args, &report);
464 	if (err < 0) {
465 		tuner->signal = 0;
466 	} else {
467 		/*
468 		 * tuner->signal value range: 0x0000 .. 0xFFFF,
469 		 * report.rssi: -128 .. 127
470 		 */
471 		tuner->signal = (report.rssi + 128) * 257;
472 	}
473 	si476x_core_unlock(radio->core);
474 
475 	return err;
476 }
477 
478 static int si476x_radio_s_tuner(struct file *file, void *priv,
479 				const struct v4l2_tuner *tuner)
480 {
481 	struct si476x_radio *radio = video_drvdata(file);
482 
483 	if (tuner->index != 0)
484 		return -EINVAL;
485 
486 	if (tuner->audmode == V4L2_TUNER_MODE_MONO ||
487 	    tuner->audmode == V4L2_TUNER_MODE_STEREO)
488 		radio->audmode = tuner->audmode;
489 	else
490 		radio->audmode = V4L2_TUNER_MODE_STEREO;
491 
492 	return 0;
493 }
494 
495 static int si476x_radio_init_vtable(struct si476x_radio *radio,
496 				    enum si476x_func func)
497 {
498 	static const struct si476x_radio_ops fm_ops = {
499 		.tune_freq		= si476x_core_cmd_fm_tune_freq,
500 		.seek_start		= si476x_core_cmd_fm_seek_start,
501 		.rsq_status		= si476x_core_cmd_fm_rsq_status,
502 		.rds_blckcnt		= si476x_core_cmd_fm_rds_blockcount,
503 		.phase_diversity	= si476x_core_cmd_fm_phase_diversity,
504 		.phase_div_status	= si476x_core_cmd_fm_phase_div_status,
505 		.acf_status		= si476x_core_cmd_fm_acf_status,
506 		.agc_status		= si476x_core_cmd_agc_status,
507 	};
508 
509 	static const struct si476x_radio_ops am_ops = {
510 		.tune_freq		= si476x_core_cmd_am_tune_freq,
511 		.seek_start		= si476x_core_cmd_am_seek_start,
512 		.rsq_status		= si476x_core_cmd_am_rsq_status,
513 		.rds_blckcnt		= NULL,
514 		.phase_diversity	= NULL,
515 		.phase_div_status	= NULL,
516 		.acf_status		= si476x_core_cmd_am_acf_status,
517 		.agc_status		= NULL,
518 	};
519 
520 	switch (func) {
521 	case SI476X_FUNC_FM_RECEIVER:
522 		radio->ops = &fm_ops;
523 		return 0;
524 
525 	case SI476X_FUNC_AM_RECEIVER:
526 		radio->ops = &am_ops;
527 		return 0;
528 	default:
529 		WARN(1, "Unexpected tuner function value\n");
530 		return -EINVAL;
531 	}
532 }
533 
534 static int si476x_radio_pretune(struct si476x_radio *radio,
535 				enum si476x_func func)
536 {
537 	int retval;
538 
539 	struct si476x_tune_freq_args args = {
540 		.zifsr		= false,
541 		.hd		= false,
542 		.injside	= SI476X_INJSIDE_AUTO,
543 		.tunemode	= SI476X_TM_VALIDATED_NORMAL_TUNE,
544 		.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO,
545 		.antcap		= 0,
546 	};
547 
548 	switch (func) {
549 	case SI476X_FUNC_FM_RECEIVER:
550 		args.freq = v4l2_to_si476x(radio->core,
551 					   92 * FREQ_MUL);
552 		retval = radio->ops->tune_freq(radio->core, &args);
553 		break;
554 	case SI476X_FUNC_AM_RECEIVER:
555 		args.freq = v4l2_to_si476x(radio->core,
556 					   0.6 * FREQ_MUL);
557 		retval = radio->ops->tune_freq(radio->core, &args);
558 		break;
559 	default:
560 		WARN(1, "Unexpected tuner function value\n");
561 		retval = -EINVAL;
562 	}
563 
564 	return retval;
565 }
566 static int si476x_radio_do_post_powerup_init(struct si476x_radio *radio,
567 					     enum si476x_func func)
568 {
569 	int err;
570 
571 	/* regcache_mark_dirty(radio->core->regmap); */
572 	err = regcache_sync_region(radio->core->regmap,
573 				   SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE,
574 				   SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT);
575 	if (err < 0)
576 		return err;
577 
578 	err = regcache_sync_region(radio->core->regmap,
579 				   SI476X_PROP_AUDIO_DEEMPHASIS,
580 				   SI476X_PROP_AUDIO_PWR_LINE_FILTER);
581 	if (err < 0)
582 		return err;
583 
584 	err = regcache_sync_region(radio->core->regmap,
585 				   SI476X_PROP_INT_CTL_ENABLE,
586 				   SI476X_PROP_INT_CTL_ENABLE);
587 	if (err < 0)
588 		return err;
589 
590 	/*
591 	 * Is there any point in restoring SNR and the like
592 	 * when switching between AM/FM?
593 	 */
594 	err = regcache_sync_region(radio->core->regmap,
595 				   SI476X_PROP_VALID_MAX_TUNE_ERROR,
596 				   SI476X_PROP_VALID_MAX_TUNE_ERROR);
597 	if (err < 0)
598 		return err;
599 
600 	err = regcache_sync_region(radio->core->regmap,
601 				   SI476X_PROP_VALID_SNR_THRESHOLD,
602 				   SI476X_PROP_VALID_RSSI_THRESHOLD);
603 	if (err < 0)
604 		return err;
605 
606 	if (func == SI476X_FUNC_FM_RECEIVER) {
607 		if (si476x_core_has_diversity(radio->core)) {
608 			err = si476x_core_cmd_fm_phase_diversity(radio->core,
609 								 radio->core->diversity_mode);
610 			if (err < 0)
611 				return err;
612 		}
613 
614 		err = regcache_sync_region(radio->core->regmap,
615 					   SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
616 					   SI476X_PROP_FM_RDS_CONFIG);
617 		if (err < 0)
618 			return err;
619 	}
620 
621 	return si476x_radio_init_vtable(radio, func);
622 
623 }
624 
625 static int si476x_radio_change_func(struct si476x_radio *radio,
626 				    enum si476x_func func)
627 {
628 	int err;
629 	bool soft;
630 	/*
631 	 * Since power/up down is a very time consuming operation,
632 	 * try to avoid doing it if the requested mode matches the one
633 	 * the tuner is in
634 	 */
635 	if (func == radio->core->power_up_parameters.func)
636 		return 0;
637 
638 	soft = true;
639 	err = si476x_core_stop(radio->core, soft);
640 	if (err < 0) {
641 		/*
642 		 * OK, if the chip does not want to play nice let's
643 		 * try to reset it in more brutal way
644 		 */
645 		soft = false;
646 		err = si476x_core_stop(radio->core, soft);
647 		if (err < 0)
648 			return err;
649 	}
650 	/*
651 	  Set the desired radio tuner function
652 	 */
653 	radio->core->power_up_parameters.func = func;
654 
655 	err = si476x_core_start(radio->core, soft);
656 	if (err < 0)
657 		return err;
658 
659 	/*
660 	 * No need to do the rest of manipulations for the bootlader
661 	 * mode
662 	 */
663 	if (func != SI476X_FUNC_FM_RECEIVER &&
664 	    func != SI476X_FUNC_AM_RECEIVER)
665 		return err;
666 
667 	return si476x_radio_do_post_powerup_init(radio, func);
668 }
669 
670 static int si476x_radio_g_frequency(struct file *file, void *priv,
671 			      struct v4l2_frequency *f)
672 {
673 	int err;
674 	struct si476x_radio *radio = video_drvdata(file);
675 
676 	if (f->tuner != 0 ||
677 	    f->type  != V4L2_TUNER_RADIO)
678 		return -EINVAL;
679 
680 	si476x_core_lock(radio->core);
681 
682 	if (radio->ops->rsq_status) {
683 		struct si476x_rsq_status_report report;
684 		struct si476x_rsq_status_args   args = {
685 			.primary	= false,
686 			.rsqack		= false,
687 			.attune		= true,
688 			.cancel		= false,
689 			.stcack		= false,
690 		};
691 
692 		err = radio->ops->rsq_status(radio->core, &args, &report);
693 		if (!err)
694 			f->frequency = si476x_to_v4l2(radio->core,
695 						      report.readfreq);
696 	} else {
697 		err = -EINVAL;
698 	}
699 
700 	si476x_core_unlock(radio->core);
701 
702 	return err;
703 }
704 
705 static int si476x_radio_s_frequency(struct file *file, void *priv,
706 				    const struct v4l2_frequency *f)
707 {
708 	int err;
709 	u32 freq = f->frequency;
710 	struct si476x_tune_freq_args args;
711 	struct si476x_radio *radio = video_drvdata(file);
712 
713 	const u32 midrange = (si476x_bands[SI476X_BAND_AM].rangehigh +
714 			      si476x_bands[SI476X_BAND_FM].rangelow) / 2;
715 	const int band = (freq > midrange) ?
716 		SI476X_BAND_FM : SI476X_BAND_AM;
717 	const enum si476x_func func = (band == SI476X_BAND_AM) ?
718 		SI476X_FUNC_AM_RECEIVER : SI476X_FUNC_FM_RECEIVER;
719 
720 	if (f->tuner != 0 ||
721 	    f->type  != V4L2_TUNER_RADIO)
722 		return -EINVAL;
723 
724 	si476x_core_lock(radio->core);
725 
726 	freq = clamp(freq,
727 		     si476x_bands[band].rangelow,
728 		     si476x_bands[band].rangehigh);
729 
730 	if (si476x_radio_freq_is_inside_of_the_band(freq,
731 						    SI476X_BAND_AM) &&
732 	    (!si476x_core_has_am(radio->core) ||
733 	     si476x_core_is_a_secondary_tuner(radio->core))) {
734 		err = -EINVAL;
735 		goto unlock;
736 	}
737 
738 	err = si476x_radio_change_func(radio, func);
739 	if (err < 0)
740 		goto unlock;
741 
742 	args.zifsr		= false;
743 	args.hd			= false;
744 	args.injside		= SI476X_INJSIDE_AUTO;
745 	args.freq		= v4l2_to_si476x(radio->core, freq);
746 	args.tunemode		= SI476X_TM_VALIDATED_NORMAL_TUNE;
747 	args.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO;
748 	args.antcap		= 0;
749 
750 	err = radio->ops->tune_freq(radio->core, &args);
751 
752 unlock:
753 	si476x_core_unlock(radio->core);
754 	return err;
755 }
756 
757 static int si476x_radio_s_hw_freq_seek(struct file *file, void *priv,
758 				       const struct v4l2_hw_freq_seek *seek)
759 {
760 	int err;
761 	enum si476x_func func;
762 	u32 rangelow = seek->rangelow, rangehigh = seek->rangehigh;
763 	struct si476x_radio *radio = video_drvdata(file);
764 
765 	if (file->f_flags & O_NONBLOCK)
766 		return -EAGAIN;
767 
768 	if (seek->tuner != 0 ||
769 	    seek->type  != V4L2_TUNER_RADIO)
770 		return -EINVAL;
771 
772 	si476x_core_lock(radio->core);
773 
774 	if (!rangelow) {
775 		err = regmap_read(radio->core->regmap,
776 				  SI476X_PROP_SEEK_BAND_BOTTOM,
777 				  &rangelow);
778 		if (err)
779 			goto unlock;
780 		rangelow = si476x_to_v4l2(radio->core, rangelow);
781 	}
782 	if (!rangehigh) {
783 		err = regmap_read(radio->core->regmap,
784 				  SI476X_PROP_SEEK_BAND_TOP,
785 				  &rangehigh);
786 		if (err)
787 			goto unlock;
788 		rangehigh = si476x_to_v4l2(radio->core, rangehigh);
789 	}
790 
791 	if (rangelow > rangehigh) {
792 		err = -EINVAL;
793 		goto unlock;
794 	}
795 
796 	if (si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
797 						     SI476X_BAND_FM)) {
798 		func = SI476X_FUNC_FM_RECEIVER;
799 
800 	} else if (si476x_core_has_am(radio->core) &&
801 		   si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
802 							    SI476X_BAND_AM)) {
803 		func = SI476X_FUNC_AM_RECEIVER;
804 	} else {
805 		err = -EINVAL;
806 		goto unlock;
807 	}
808 
809 	err = si476x_radio_change_func(radio, func);
810 	if (err < 0)
811 		goto unlock;
812 
813 	if (seek->rangehigh) {
814 		err = regmap_write(radio->core->regmap,
815 				   SI476X_PROP_SEEK_BAND_TOP,
816 				   v4l2_to_si476x(radio->core,
817 						  seek->rangehigh));
818 		if (err)
819 			goto unlock;
820 	}
821 	if (seek->rangelow) {
822 		err = regmap_write(radio->core->regmap,
823 				   SI476X_PROP_SEEK_BAND_BOTTOM,
824 				   v4l2_to_si476x(radio->core,
825 						  seek->rangelow));
826 		if (err)
827 			goto unlock;
828 	}
829 	if (seek->spacing) {
830 		err = regmap_write(radio->core->regmap,
831 				     SI476X_PROP_SEEK_FREQUENCY_SPACING,
832 				     v4l2_to_si476x(radio->core,
833 						    seek->spacing));
834 		if (err)
835 			goto unlock;
836 	}
837 
838 	err = radio->ops->seek_start(radio->core,
839 				     seek->seek_upward,
840 				     seek->wrap_around);
841 unlock:
842 	si476x_core_unlock(radio->core);
843 
844 
845 
846 	return err;
847 }
848 
849 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
850 {
851 	int retval;
852 	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
853 
854 	si476x_core_lock(radio->core);
855 
856 	switch (ctrl->id) {
857 	case V4L2_CID_SI476X_INTERCHIP_LINK:
858 		if (si476x_core_has_diversity(radio->core)) {
859 			if (radio->ops->phase_diversity) {
860 				retval = radio->ops->phase_div_status(radio->core);
861 				if (retval < 0)
862 					break;
863 
864 				ctrl->val = !!SI476X_PHDIV_STATUS_LINK_LOCKED(retval);
865 				retval = 0;
866 				break;
867 			} else {
868 				retval = -ENOTTY;
869 				break;
870 			}
871 		}
872 		retval = -EINVAL;
873 		break;
874 	default:
875 		retval = -EINVAL;
876 		break;
877 	}
878 	si476x_core_unlock(radio->core);
879 	return retval;
880 
881 }
882 
883 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl)
884 {
885 	int retval;
886 	enum si476x_phase_diversity_mode mode;
887 	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
888 
889 	si476x_core_lock(radio->core);
890 
891 	switch (ctrl->id) {
892 	case V4L2_CID_SI476X_HARMONICS_COUNT:
893 		retval = regmap_update_bits(radio->core->regmap,
894 					    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
895 					    SI476X_PROP_PWR_HARMONICS_MASK,
896 					    ctrl->val);
897 		break;
898 	case V4L2_CID_POWER_LINE_FREQUENCY:
899 		switch (ctrl->val) {
900 		case V4L2_CID_POWER_LINE_FREQUENCY_DISABLED:
901 			retval = regmap_update_bits(radio->core->regmap,
902 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
903 						    SI476X_PROP_PWR_ENABLE_MASK,
904 						    0);
905 			break;
906 		case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
907 			retval = regmap_update_bits(radio->core->regmap,
908 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
909 						    SI476X_PROP_PWR_GRID_MASK,
910 						    SI476X_PROP_PWR_GRID_50HZ);
911 			break;
912 		case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
913 			retval = regmap_update_bits(radio->core->regmap,
914 						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
915 						    SI476X_PROP_PWR_GRID_MASK,
916 						    SI476X_PROP_PWR_GRID_60HZ);
917 			break;
918 		default:
919 			retval = -EINVAL;
920 			break;
921 		}
922 		break;
923 	case V4L2_CID_SI476X_RSSI_THRESHOLD:
924 		retval = regmap_write(radio->core->regmap,
925 				      SI476X_PROP_VALID_RSSI_THRESHOLD,
926 				      ctrl->val);
927 		break;
928 	case V4L2_CID_SI476X_SNR_THRESHOLD:
929 		retval = regmap_write(radio->core->regmap,
930 				      SI476X_PROP_VALID_SNR_THRESHOLD,
931 				      ctrl->val);
932 		break;
933 	case V4L2_CID_SI476X_MAX_TUNE_ERROR:
934 		retval = regmap_write(radio->core->regmap,
935 				      SI476X_PROP_VALID_MAX_TUNE_ERROR,
936 				      ctrl->val);
937 		break;
938 	case V4L2_CID_RDS_RECEPTION:
939 		/*
940 		 * It looks like RDS related properties are
941 		 * inaccesable when tuner is in AM mode, so cache the
942 		 * changes
943 		 */
944 		if (si476x_core_is_in_am_receiver_mode(radio->core))
945 			regcache_cache_only(radio->core->regmap, true);
946 
947 		if (ctrl->val) {
948 			retval = regmap_write(radio->core->regmap,
949 					      SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT,
950 					      radio->core->rds_fifo_depth);
951 			if (retval < 0)
952 				break;
953 
954 			if (radio->core->client->irq) {
955 				retval = regmap_write(radio->core->regmap,
956 						      SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
957 						      SI476X_RDSRECV);
958 				if (retval < 0)
959 					break;
960 			}
961 
962 			/* Drain RDS FIFO before enabling RDS processing */
963 			retval = si476x_core_cmd_fm_rds_status(radio->core,
964 							       false,
965 							       true,
966 							       true,
967 							       NULL);
968 			if (retval < 0)
969 				break;
970 
971 			retval = regmap_update_bits(radio->core->regmap,
972 						    SI476X_PROP_FM_RDS_CONFIG,
973 						    SI476X_PROP_RDSEN_MASK,
974 						    SI476X_PROP_RDSEN);
975 		} else {
976 			retval = regmap_update_bits(radio->core->regmap,
977 						    SI476X_PROP_FM_RDS_CONFIG,
978 						    SI476X_PROP_RDSEN_MASK,
979 						    !SI476X_PROP_RDSEN);
980 		}
981 
982 		if (si476x_core_is_in_am_receiver_mode(radio->core))
983 			regcache_cache_only(radio->core->regmap, false);
984 		break;
985 	case V4L2_CID_TUNE_DEEMPHASIS:
986 		retval = regmap_write(radio->core->regmap,
987 				      SI476X_PROP_AUDIO_DEEMPHASIS,
988 				      ctrl->val);
989 		break;
990 
991 	case V4L2_CID_SI476X_DIVERSITY_MODE:
992 		mode = si476x_phase_diversity_idx_to_mode(ctrl->val);
993 
994 		if (mode == radio->core->diversity_mode) {
995 			retval = 0;
996 			break;
997 		}
998 
999 		if (si476x_core_is_in_am_receiver_mode(radio->core)) {
1000 			/*
1001 			 * Diversity cannot be configured while tuner
1002 			 * is in AM mode so save the changes and carry on.
1003 			 */
1004 			radio->core->diversity_mode = mode;
1005 			retval = 0;
1006 		} else {
1007 			retval = radio->ops->phase_diversity(radio->core, mode);
1008 			if (!retval)
1009 				radio->core->diversity_mode = mode;
1010 		}
1011 		break;
1012 
1013 	default:
1014 		retval = -EINVAL;
1015 		break;
1016 	}
1017 
1018 	si476x_core_unlock(radio->core);
1019 
1020 	return retval;
1021 }
1022 
1023 #ifdef CONFIG_VIDEO_ADV_DEBUG
1024 static int si476x_radio_g_register(struct file *file, void *fh,
1025 				   struct v4l2_dbg_register *reg)
1026 {
1027 	int err;
1028 	unsigned int value;
1029 	struct si476x_radio *radio = video_drvdata(file);
1030 
1031 	si476x_core_lock(radio->core);
1032 	reg->size = 2;
1033 	err = regmap_read(radio->core->regmap,
1034 			  (unsigned int)reg->reg, &value);
1035 	reg->val = value;
1036 	si476x_core_unlock(radio->core);
1037 
1038 	return err;
1039 }
1040 static int si476x_radio_s_register(struct file *file, void *fh,
1041 				   const struct v4l2_dbg_register *reg)
1042 {
1043 
1044 	int err;
1045 	struct si476x_radio *radio = video_drvdata(file);
1046 
1047 	si476x_core_lock(radio->core);
1048 	err = regmap_write(radio->core->regmap,
1049 			   (unsigned int)reg->reg,
1050 			   (unsigned int)reg->val);
1051 	si476x_core_unlock(radio->core);
1052 
1053 	return err;
1054 }
1055 #endif
1056 
1057 static int si476x_radio_fops_open(struct file *file)
1058 {
1059 	struct si476x_radio *radio = video_drvdata(file);
1060 	int err;
1061 
1062 	err = v4l2_fh_open(file);
1063 	if (err)
1064 		return err;
1065 
1066 	if (v4l2_fh_is_singular_file(file)) {
1067 		si476x_core_lock(radio->core);
1068 		err = si476x_core_set_power_state(radio->core,
1069 						  SI476X_POWER_UP_FULL);
1070 		if (err < 0)
1071 			goto done;
1072 
1073 		err = si476x_radio_do_post_powerup_init(radio,
1074 							radio->core->power_up_parameters.func);
1075 		if (err < 0)
1076 			goto power_down;
1077 
1078 		err = si476x_radio_pretune(radio,
1079 					   radio->core->power_up_parameters.func);
1080 		if (err < 0)
1081 			goto power_down;
1082 
1083 		si476x_core_unlock(radio->core);
1084 		/*Must be done after si476x_core_unlock to prevent a deadlock*/
1085 		v4l2_ctrl_handler_setup(&radio->ctrl_handler);
1086 	}
1087 
1088 	return err;
1089 
1090 power_down:
1091 	si476x_core_set_power_state(radio->core,
1092 				    SI476X_POWER_DOWN);
1093 done:
1094 	si476x_core_unlock(radio->core);
1095 	v4l2_fh_release(file);
1096 
1097 	return err;
1098 }
1099 
1100 static int si476x_radio_fops_release(struct file *file)
1101 {
1102 	int err;
1103 	struct si476x_radio *radio = video_drvdata(file);
1104 
1105 	if (v4l2_fh_is_singular_file(file) &&
1106 	    atomic_read(&radio->core->is_alive))
1107 		si476x_core_set_power_state(radio->core,
1108 					    SI476X_POWER_DOWN);
1109 
1110 	err = v4l2_fh_release(file);
1111 
1112 	return err;
1113 }
1114 
1115 static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
1116 				      size_t count, loff_t *ppos)
1117 {
1118 	ssize_t      rval;
1119 	size_t       fifo_len;
1120 	unsigned int copied;
1121 
1122 	struct si476x_radio *radio = video_drvdata(file);
1123 
1124 	/* block if no new data available */
1125 	if (kfifo_is_empty(&radio->core->rds_fifo)) {
1126 		if (file->f_flags & O_NONBLOCK)
1127 			return -EWOULDBLOCK;
1128 
1129 		rval = wait_event_interruptible(radio->core->rds_read_queue,
1130 						(!kfifo_is_empty(&radio->core->rds_fifo) ||
1131 						 !atomic_read(&radio->core->is_alive)));
1132 		if (rval < 0)
1133 			return -EINTR;
1134 
1135 		if (!atomic_read(&radio->core->is_alive))
1136 			return -ENODEV;
1137 	}
1138 
1139 	fifo_len = kfifo_len(&radio->core->rds_fifo);
1140 
1141 	if (kfifo_to_user(&radio->core->rds_fifo, buf,
1142 			  min(fifo_len, count),
1143 			  &copied) != 0) {
1144 		dev_warn(&radio->videodev.dev,
1145 			 "Error during FIFO to userspace copy\n");
1146 		rval = -EIO;
1147 	} else {
1148 		rval = (ssize_t)copied;
1149 	}
1150 
1151 	return rval;
1152 }
1153 
1154 static __poll_t si476x_radio_fops_poll(struct file *file,
1155 				struct poll_table_struct *pts)
1156 {
1157 	struct si476x_radio *radio = video_drvdata(file);
1158 	__poll_t req_events = poll_requested_events(pts);
1159 	__poll_t err = v4l2_ctrl_poll(file, pts);
1160 
1161 	if (req_events & (EPOLLIN | EPOLLRDNORM)) {
1162 		if (atomic_read(&radio->core->is_alive))
1163 			poll_wait(file, &radio->core->rds_read_queue, pts);
1164 
1165 		if (!atomic_read(&radio->core->is_alive))
1166 			err = EPOLLHUP;
1167 
1168 		if (!kfifo_is_empty(&radio->core->rds_fifo))
1169 			err = EPOLLIN | EPOLLRDNORM;
1170 	}
1171 
1172 	return err;
1173 }
1174 
1175 static const struct v4l2_file_operations si476x_fops = {
1176 	.owner			= THIS_MODULE,
1177 	.read			= si476x_radio_fops_read,
1178 	.poll			= si476x_radio_fops_poll,
1179 	.unlocked_ioctl		= video_ioctl2,
1180 	.open			= si476x_radio_fops_open,
1181 	.release		= si476x_radio_fops_release,
1182 };
1183 
1184 
1185 static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
1186 	.vidioc_querycap		= si476x_radio_querycap,
1187 	.vidioc_g_tuner			= si476x_radio_g_tuner,
1188 	.vidioc_s_tuner			= si476x_radio_s_tuner,
1189 
1190 	.vidioc_g_frequency		= si476x_radio_g_frequency,
1191 	.vidioc_s_frequency		= si476x_radio_s_frequency,
1192 	.vidioc_s_hw_freq_seek		= si476x_radio_s_hw_freq_seek,
1193 	.vidioc_enum_freq_bands		= si476x_radio_enum_freq_bands,
1194 
1195 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
1196 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
1197 
1198 #ifdef CONFIG_VIDEO_ADV_DEBUG
1199 	.vidioc_g_register		= si476x_radio_g_register,
1200 	.vidioc_s_register		= si476x_radio_s_register,
1201 #endif
1202 };
1203 
1204 
1205 static const struct video_device si476x_viddev_template = {
1206 	.fops			= &si476x_fops,
1207 	.name			= DRIVER_NAME,
1208 	.release		= video_device_release_empty,
1209 };
1210 
1211 
1212 
1213 static ssize_t si476x_radio_read_acf_blob(struct file *file,
1214 					  char __user *user_buf,
1215 					  size_t count, loff_t *ppos)
1216 {
1217 	int err;
1218 	struct si476x_radio *radio = file->private_data;
1219 	struct si476x_acf_status_report report;
1220 
1221 	si476x_core_lock(radio->core);
1222 	if (radio->ops->acf_status)
1223 		err = radio->ops->acf_status(radio->core, &report);
1224 	else
1225 		err = -ENOENT;
1226 	si476x_core_unlock(radio->core);
1227 
1228 	if (err < 0)
1229 		return err;
1230 
1231 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1232 				       sizeof(report));
1233 }
1234 
1235 static const struct file_operations radio_acf_fops = {
1236 	.open	= simple_open,
1237 	.llseek = default_llseek,
1238 	.read	= si476x_radio_read_acf_blob,
1239 };
1240 
1241 static ssize_t si476x_radio_read_rds_blckcnt_blob(struct file *file,
1242 						  char __user *user_buf,
1243 						  size_t count, loff_t *ppos)
1244 {
1245 	int err;
1246 	struct si476x_radio *radio = file->private_data;
1247 	struct si476x_rds_blockcount_report report;
1248 
1249 	si476x_core_lock(radio->core);
1250 	if (radio->ops->rds_blckcnt)
1251 		err = radio->ops->rds_blckcnt(radio->core, true,
1252 					       &report);
1253 	else
1254 		err = -ENOENT;
1255 	si476x_core_unlock(radio->core);
1256 
1257 	if (err < 0)
1258 		return err;
1259 
1260 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1261 				       sizeof(report));
1262 }
1263 
1264 static const struct file_operations radio_rds_blckcnt_fops = {
1265 	.open	= simple_open,
1266 	.llseek = default_llseek,
1267 	.read	= si476x_radio_read_rds_blckcnt_blob,
1268 };
1269 
1270 static ssize_t si476x_radio_read_agc_blob(struct file *file,
1271 					  char __user *user_buf,
1272 					  size_t count, loff_t *ppos)
1273 {
1274 	int err;
1275 	struct si476x_radio *radio = file->private_data;
1276 	struct si476x_agc_status_report report;
1277 
1278 	si476x_core_lock(radio->core);
1279 	if (radio->ops->rds_blckcnt)
1280 		err = radio->ops->agc_status(radio->core, &report);
1281 	else
1282 		err = -ENOENT;
1283 	si476x_core_unlock(radio->core);
1284 
1285 	if (err < 0)
1286 		return err;
1287 
1288 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1289 				       sizeof(report));
1290 }
1291 
1292 static const struct file_operations radio_agc_fops = {
1293 	.open	= simple_open,
1294 	.llseek = default_llseek,
1295 	.read	= si476x_radio_read_agc_blob,
1296 };
1297 
1298 static ssize_t si476x_radio_read_rsq_blob(struct file *file,
1299 					  char __user *user_buf,
1300 					  size_t count, loff_t *ppos)
1301 {
1302 	int err;
1303 	struct si476x_radio *radio = file->private_data;
1304 	struct si476x_rsq_status_report report;
1305 	struct si476x_rsq_status_args args = {
1306 		.primary	= false,
1307 		.rsqack		= false,
1308 		.attune		= false,
1309 		.cancel		= false,
1310 		.stcack		= false,
1311 	};
1312 
1313 	si476x_core_lock(radio->core);
1314 	if (radio->ops->rds_blckcnt)
1315 		err = radio->ops->rsq_status(radio->core, &args, &report);
1316 	else
1317 		err = -ENOENT;
1318 	si476x_core_unlock(radio->core);
1319 
1320 	if (err < 0)
1321 		return err;
1322 
1323 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1324 				       sizeof(report));
1325 }
1326 
1327 static const struct file_operations radio_rsq_fops = {
1328 	.open	= simple_open,
1329 	.llseek = default_llseek,
1330 	.read	= si476x_radio_read_rsq_blob,
1331 };
1332 
1333 static ssize_t si476x_radio_read_rsq_primary_blob(struct file *file,
1334 						  char __user *user_buf,
1335 						  size_t count, loff_t *ppos)
1336 {
1337 	int err;
1338 	struct si476x_radio *radio = file->private_data;
1339 	struct si476x_rsq_status_report report;
1340 	struct si476x_rsq_status_args args = {
1341 		.primary	= true,
1342 		.rsqack		= false,
1343 		.attune		= false,
1344 		.cancel		= false,
1345 		.stcack		= false,
1346 	};
1347 
1348 	si476x_core_lock(radio->core);
1349 	if (radio->ops->rds_blckcnt)
1350 		err = radio->ops->rsq_status(radio->core, &args, &report);
1351 	else
1352 		err = -ENOENT;
1353 	si476x_core_unlock(radio->core);
1354 
1355 	if (err < 0)
1356 		return err;
1357 
1358 	return simple_read_from_buffer(user_buf, count, ppos, &report,
1359 				       sizeof(report));
1360 }
1361 
1362 static const struct file_operations radio_rsq_primary_fops = {
1363 	.open	= simple_open,
1364 	.llseek = default_llseek,
1365 	.read	= si476x_radio_read_rsq_primary_blob,
1366 };
1367 
1368 
1369 static int si476x_radio_init_debugfs(struct si476x_radio *radio)
1370 {
1371 	struct dentry	*dentry;
1372 	int		ret;
1373 
1374 	dentry = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
1375 	if (IS_ERR(dentry)) {
1376 		ret = PTR_ERR(dentry);
1377 		goto exit;
1378 	}
1379 	radio->debugfs = dentry;
1380 
1381 	dentry = debugfs_create_file("acf", S_IRUGO,
1382 				     radio->debugfs, radio, &radio_acf_fops);
1383 	if (IS_ERR(dentry)) {
1384 		ret = PTR_ERR(dentry);
1385 		goto cleanup;
1386 	}
1387 
1388 	dentry = debugfs_create_file("rds_blckcnt", S_IRUGO,
1389 				     radio->debugfs, radio,
1390 				     &radio_rds_blckcnt_fops);
1391 	if (IS_ERR(dentry)) {
1392 		ret = PTR_ERR(dentry);
1393 		goto cleanup;
1394 	}
1395 
1396 	dentry = debugfs_create_file("agc", S_IRUGO,
1397 				     radio->debugfs, radio, &radio_agc_fops);
1398 	if (IS_ERR(dentry)) {
1399 		ret = PTR_ERR(dentry);
1400 		goto cleanup;
1401 	}
1402 
1403 	dentry = debugfs_create_file("rsq", S_IRUGO,
1404 				     radio->debugfs, radio, &radio_rsq_fops);
1405 	if (IS_ERR(dentry)) {
1406 		ret = PTR_ERR(dentry);
1407 		goto cleanup;
1408 	}
1409 
1410 	dentry = debugfs_create_file("rsq_primary", S_IRUGO,
1411 				     radio->debugfs, radio,
1412 				     &radio_rsq_primary_fops);
1413 	if (IS_ERR(dentry)) {
1414 		ret = PTR_ERR(dentry);
1415 		goto cleanup;
1416 	}
1417 
1418 	return 0;
1419 cleanup:
1420 	debugfs_remove_recursive(radio->debugfs);
1421 exit:
1422 	return ret;
1423 }
1424 
1425 
1426 static int si476x_radio_add_new_custom(struct si476x_radio *radio,
1427 				       enum si476x_ctrl_idx idx)
1428 {
1429 	int rval;
1430 	struct v4l2_ctrl *ctrl;
1431 
1432 	ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
1433 				    &si476x_ctrls[idx],
1434 				    NULL);
1435 	rval = radio->ctrl_handler.error;
1436 	if (ctrl == NULL && rval)
1437 		dev_err(radio->v4l2dev.dev,
1438 			"Could not initialize '%s' control %d\n",
1439 			si476x_ctrls[idx].name, rval);
1440 
1441 	return rval;
1442 }
1443 
1444 static int si476x_radio_probe(struct platform_device *pdev)
1445 {
1446 	int rval;
1447 	struct si476x_radio *radio;
1448 	struct v4l2_ctrl *ctrl;
1449 
1450 	static atomic_t instance = ATOMIC_INIT(0);
1451 
1452 	radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
1453 	if (!radio)
1454 		return -ENOMEM;
1455 
1456 	radio->core = i2c_mfd_cell_to_core(&pdev->dev);
1457 
1458 	v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
1459 
1460 	rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
1461 	if (rval) {
1462 		dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
1463 		return rval;
1464 	}
1465 
1466 	memcpy(&radio->videodev, &si476x_viddev_template,
1467 	       sizeof(struct video_device));
1468 
1469 	radio->videodev.v4l2_dev  = &radio->v4l2dev;
1470 	radio->videodev.ioctl_ops = &si4761_ioctl_ops;
1471 
1472 	video_set_drvdata(&radio->videodev, radio);
1473 	platform_set_drvdata(pdev, radio);
1474 
1475 
1476 	radio->v4l2dev.ctrl_handler = &radio->ctrl_handler;
1477 	v4l2_ctrl_handler_init(&radio->ctrl_handler,
1478 			       1 + ARRAY_SIZE(si476x_ctrls));
1479 
1480 	if (si476x_core_has_am(radio->core)) {
1481 		ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1482 					      &si476x_ctrl_ops,
1483 					      V4L2_CID_POWER_LINE_FREQUENCY,
1484 					      V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
1485 					      0, 0);
1486 		rval = radio->ctrl_handler.error;
1487 		if (ctrl == NULL && rval) {
1488 			dev_err(&pdev->dev, "Could not initialize V4L2_CID_POWER_LINE_FREQUENCY control %d\n",
1489 				rval);
1490 			goto exit;
1491 		}
1492 
1493 		rval = si476x_radio_add_new_custom(radio,
1494 						   SI476X_IDX_HARMONICS_COUNT);
1495 		if (rval < 0)
1496 			goto exit;
1497 	}
1498 
1499 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RSSI_THRESHOLD);
1500 	if (rval < 0)
1501 		goto exit;
1502 
1503 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_SNR_THRESHOLD);
1504 	if (rval < 0)
1505 		goto exit;
1506 
1507 	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_MAX_TUNE_ERROR);
1508 	if (rval < 0)
1509 		goto exit;
1510 
1511 	ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1512 				      &si476x_ctrl_ops,
1513 				      V4L2_CID_TUNE_DEEMPHASIS,
1514 				      V4L2_DEEMPHASIS_75_uS, 0, 0);
1515 	rval = radio->ctrl_handler.error;
1516 	if (ctrl == NULL && rval) {
1517 		dev_err(&pdev->dev, "Could not initialize V4L2_CID_TUNE_DEEMPHASIS control %d\n",
1518 			rval);
1519 		goto exit;
1520 	}
1521 
1522 	ctrl = v4l2_ctrl_new_std(&radio->ctrl_handler, &si476x_ctrl_ops,
1523 				 V4L2_CID_RDS_RECEPTION,
1524 				 0, 1, 1, 1);
1525 	rval = radio->ctrl_handler.error;
1526 	if (ctrl == NULL && rval) {
1527 		dev_err(&pdev->dev, "Could not initialize V4L2_CID_RDS_RECEPTION control %d\n",
1528 			rval);
1529 		goto exit;
1530 	}
1531 
1532 	if (si476x_core_has_diversity(radio->core)) {
1533 		si476x_ctrls[SI476X_IDX_DIVERSITY_MODE].def =
1534 			si476x_phase_diversity_mode_to_idx(radio->core->diversity_mode);
1535 		rval = si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
1536 		if (rval < 0)
1537 			goto exit;
1538 
1539 		rval = si476x_radio_add_new_custom(radio, SI476X_IDX_INTERCHIP_LINK);
1540 		if (rval < 0)
1541 			goto exit;
1542 	}
1543 
1544 	/* register video device */
1545 	rval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, -1);
1546 	if (rval < 0) {
1547 		dev_err(&pdev->dev, "Could not register video device\n");
1548 		goto exit;
1549 	}
1550 
1551 	rval = si476x_radio_init_debugfs(radio);
1552 	if (rval < 0) {
1553 		dev_err(&pdev->dev, "Could not creat debugfs interface\n");
1554 		goto exit;
1555 	}
1556 
1557 	return 0;
1558 exit:
1559 	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1560 	return rval;
1561 }
1562 
1563 static int si476x_radio_remove(struct platform_device *pdev)
1564 {
1565 	struct si476x_radio *radio = platform_get_drvdata(pdev);
1566 
1567 	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1568 	video_unregister_device(&radio->videodev);
1569 	v4l2_device_unregister(&radio->v4l2dev);
1570 	debugfs_remove_recursive(radio->debugfs);
1571 
1572 	return 0;
1573 }
1574 
1575 MODULE_ALIAS("platform:si476x-radio");
1576 
1577 static struct platform_driver si476x_radio_driver = {
1578 	.driver		= {
1579 		.name	= DRIVER_NAME,
1580 	},
1581 	.probe		= si476x_radio_probe,
1582 	.remove		= si476x_radio_remove,
1583 };
1584 module_platform_driver(si476x_radio_driver);
1585 
1586 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
1587 MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
1588 MODULE_LICENSE("GPL");
1589