radio-si476x.c

   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
  43enum si476x_freq_bands {
  44	SI476X_BAND_FM,
  45	SI476X_BAND_AM,
  46};
  47
  48static 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
  72static 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
  78static 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
  85static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl);
  86static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
  87
  88enum 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
  96static 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
 104static inline enum phase_diversity_modes_idx
 105si476x_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
 123static inline enum si476x_phase_diversity_mode
 124si476x_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
 137static 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
 143enum 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};
 151static 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
 251struct 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 */
 271struct 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 */
 302struct 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
 315static inline struct si476x_radio *
 316v4l2_ctrl_handler_to_radio(struct v4l2_ctrl_handler *d)
 317{
 318	return container_of(d, struct si476x_radio, ctrl_handler);
 319}
 320
 321/*
 322 * si476x_vidioc_querycap - query device capabilities
 323 */
 324static int si476x_radio_querycap(struct file *file, void *priv,
 325				 struct v4l2_capability *capability)
 326{
 327	struct si476x_radio *radio = video_drvdata(file);
 328
 329	strscpy(capability->driver, radio->v4l2dev.name,
 330		sizeof(capability->driver));
 331	strscpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 332	return 0;
 333}
 334
 335static int si476x_radio_enum_freq_bands(struct file *file, void *priv,
 336					struct v4l2_frequency_band *band)
 337{
 338	int err;
 339	struct si476x_radio *radio = video_drvdata(file);
 340
 341	if (band->tuner != 0)
 342		return -EINVAL;
 343
 344	switch (radio->core->chip_id) {
 345		/* AM/FM tuners -- all bands are supported */
 346	case SI476X_CHIP_SI4761:
 347	case SI476X_CHIP_SI4764:
 348		if (band->index < ARRAY_SIZE(si476x_bands)) {
 349			*band = si476x_bands[band->index];
 350			err = 0;
 351		} else {
 352			err = -EINVAL;
 353		}
 354		break;
 355		/* FM companion tuner chips -- only FM bands are
 356		 * supported */
 357	case SI476X_CHIP_SI4768:
 358		if (band->index == SI476X_BAND_FM) {
 359			*band = si476x_bands[band->index];
 360			err = 0;
 361		} else {
 362			err = -EINVAL;
 363		}
 364		break;
 365	default:
 366		err = -EINVAL;
 367	}
 368
 369	return err;
 370}
 371
 372static int si476x_radio_g_tuner(struct file *file, void *priv,
 373				struct v4l2_tuner *tuner)
 374{
 375	int err;
 376	struct si476x_rsq_status_report report;
 377	struct si476x_radio *radio = video_drvdata(file);
 378
 379	struct si476x_rsq_status_args args = {
 380		.primary	= false,
 381		.rsqack		= false,
 382		.attune		= false,
 383		.cancel		= false,
 384		.stcack		= false,
 385	};
 386
 387	if (tuner->index != 0)
 388		return -EINVAL;
 389
 390	tuner->type       = V4L2_TUNER_RADIO;
 391	tuner->capability = V4L2_TUNER_CAP_LOW /* Measure frequencies
 392						 * in multiples of
 393						 * 62.5 Hz */
 394		| V4L2_TUNER_CAP_STEREO
 395		| V4L2_TUNER_CAP_HWSEEK_BOUNDED
 396		| V4L2_TUNER_CAP_HWSEEK_WRAP
 397		| V4L2_TUNER_CAP_HWSEEK_PROG_LIM;
 398
 399	si476x_core_lock(radio->core);
 400
 401	if (si476x_core_is_a_secondary_tuner(radio->core)) {
 402		strscpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
 403		tuner->rxsubchans = 0;
 404		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
 405	} else if (si476x_core_has_am(radio->core)) {
 406		if (si476x_core_is_a_primary_tuner(radio->core))
 407			strscpy(tuner->name, "AM/FM (primary)",
 408				sizeof(tuner->name));
 409		else
 410			strscpy(tuner->name, "AM/FM", sizeof(tuner->name));
 411
 412		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO
 413			| V4L2_TUNER_SUB_RDS;
 414		tuner->capability |= V4L2_TUNER_CAP_RDS
 415			| V4L2_TUNER_CAP_RDS_BLOCK_IO
 416			| V4L2_TUNER_CAP_FREQ_BANDS;
 417
 418		tuner->rangelow = si476x_bands[SI476X_BAND_AM].rangelow;
 419	} else {
 420		strscpy(tuner->name, "FM", sizeof(tuner->name));
 421		tuner->rxsubchans = 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		tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
 426	}
 427
 428	tuner->audmode = radio->audmode;
 429
 430	tuner->afc = 1;
 431	tuner->rangehigh = si476x_bands[SI476X_BAND_FM].rangehigh;
 432
 433	err = radio->ops->rsq_status(radio->core,
 434				     &args, &report);
 435	if (err < 0) {
 436		tuner->signal = 0;
 437	} else {
 438		/*
 439		 * tuner->signal value range: 0x0000 .. 0xFFFF,
 440		 * report.rssi: -128 .. 127
 441		 */
 442		tuner->signal = (report.rssi + 128) * 257;
 443	}
 444	si476x_core_unlock(radio->core);
 445
 446	return err;
 447}
 448
 449static int si476x_radio_s_tuner(struct file *file, void *priv,
 450				const struct v4l2_tuner *tuner)
 451{
 452	struct si476x_radio *radio = video_drvdata(file);
 453
 454	if (tuner->index != 0)
 455		return -EINVAL;
 456
 457	if (tuner->audmode == V4L2_TUNER_MODE_MONO ||
 458	    tuner->audmode == V4L2_TUNER_MODE_STEREO)
 459		radio->audmode = tuner->audmode;
 460	else
 461		radio->audmode = V4L2_TUNER_MODE_STEREO;
 462
 463	return 0;
 464}
 465
 466static int si476x_radio_init_vtable(struct si476x_radio *radio,
 467				    enum si476x_func func)
 468{
 469	static const struct si476x_radio_ops fm_ops = {
 470		.tune_freq		= si476x_core_cmd_fm_tune_freq,
 471		.seek_start		= si476x_core_cmd_fm_seek_start,
 472		.rsq_status		= si476x_core_cmd_fm_rsq_status,
 473		.rds_blckcnt		= si476x_core_cmd_fm_rds_blockcount,
 474		.phase_diversity	= si476x_core_cmd_fm_phase_diversity,
 475		.phase_div_status	= si476x_core_cmd_fm_phase_div_status,
 476		.acf_status		= si476x_core_cmd_fm_acf_status,
 477		.agc_status		= si476x_core_cmd_agc_status,
 478	};
 479
 480	static const struct si476x_radio_ops am_ops = {
 481		.tune_freq		= si476x_core_cmd_am_tune_freq,
 482		.seek_start		= si476x_core_cmd_am_seek_start,
 483		.rsq_status		= si476x_core_cmd_am_rsq_status,
 484		.rds_blckcnt		= NULL,
 485		.phase_diversity	= NULL,
 486		.phase_div_status	= NULL,
 487		.acf_status		= si476x_core_cmd_am_acf_status,
 488		.agc_status		= NULL,
 489	};
 490
 491	switch (func) {
 492	case SI476X_FUNC_FM_RECEIVER:
 493		radio->ops = &fm_ops;
 494		return 0;
 495
 496	case SI476X_FUNC_AM_RECEIVER:
 497		radio->ops = &am_ops;
 498		return 0;
 499	default:
 500		WARN(1, "Unexpected tuner function value\n");
 501		return -EINVAL;
 502	}
 503}
 504
 505static int si476x_radio_pretune(struct si476x_radio *radio,
 506				enum si476x_func func)
 507{
 508	int retval;
 509
 510	struct si476x_tune_freq_args args = {
 511		.zifsr		= false,
 512		.hd		= false,
 513		.injside	= SI476X_INJSIDE_AUTO,
 514		.tunemode	= SI476X_TM_VALIDATED_NORMAL_TUNE,
 515		.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO,
 516		.antcap		= 0,
 517	};
 518
 519	switch (func) {
 520	case SI476X_FUNC_FM_RECEIVER:
 521		args.freq = v4l2_to_si476x(radio->core,
 522					   92 * FREQ_MUL);
 523		retval = radio->ops->tune_freq(radio->core, &args);
 524		break;
 525	case SI476X_FUNC_AM_RECEIVER:
 526		args.freq = v4l2_to_si476x(radio->core,
 527					   0.6 * FREQ_MUL);
 528		retval = radio->ops->tune_freq(radio->core, &args);
 529		break;
 530	default:
 531		WARN(1, "Unexpected tuner function value\n");
 532		retval = -EINVAL;
 533	}
 534
 535	return retval;
 536}
 537static int si476x_radio_do_post_powerup_init(struct si476x_radio *radio,
 538					     enum si476x_func func)
 539{
 540	int err;
 541
 542	/* regcache_mark_dirty(radio->core->regmap); */
 543	err = regcache_sync_region(radio->core->regmap,
 544				   SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE,
 545				   SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT);
 546	if (err < 0)
 547		return err;
 548
 549	err = regcache_sync_region(radio->core->regmap,
 550				   SI476X_PROP_AUDIO_DEEMPHASIS,
 551				   SI476X_PROP_AUDIO_PWR_LINE_FILTER);
 552	if (err < 0)
 553		return err;
 554
 555	err = regcache_sync_region(radio->core->regmap,
 556				   SI476X_PROP_INT_CTL_ENABLE,
 557				   SI476X_PROP_INT_CTL_ENABLE);
 558	if (err < 0)
 559		return err;
 560
 561	/*
 562	 * Is there any point in restoring SNR and the like
 563	 * when switching between AM/FM?
 564	 */
 565	err = regcache_sync_region(radio->core->regmap,
 566				   SI476X_PROP_VALID_MAX_TUNE_ERROR,
 567				   SI476X_PROP_VALID_MAX_TUNE_ERROR);
 568	if (err < 0)
 569		return err;
 570
 571	err = regcache_sync_region(radio->core->regmap,
 572				   SI476X_PROP_VALID_SNR_THRESHOLD,
 573				   SI476X_PROP_VALID_RSSI_THRESHOLD);
 574	if (err < 0)
 575		return err;
 576
 577	if (func == SI476X_FUNC_FM_RECEIVER) {
 578		if (si476x_core_has_diversity(radio->core)) {
 579			err = si476x_core_cmd_fm_phase_diversity(radio->core,
 580								 radio->core->diversity_mode);
 581			if (err < 0)
 582				return err;
 583		}
 584
 585		err = regcache_sync_region(radio->core->regmap,
 586					   SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
 587					   SI476X_PROP_FM_RDS_CONFIG);
 588		if (err < 0)
 589			return err;
 590	}
 591
 592	return si476x_radio_init_vtable(radio, func);
 593
 594}
 595
 596static int si476x_radio_change_func(struct si476x_radio *radio,
 597				    enum si476x_func func)
 598{
 599	int err;
 600	bool soft;
 601	/*
 602	 * Since power/up down is a very time consuming operation,
 603	 * try to avoid doing it if the requested mode matches the one
 604	 * the tuner is in
 605	 */
 606	if (func == radio->core->power_up_parameters.func)
 607		return 0;
 608
 609	soft = true;
 610	err = si476x_core_stop(radio->core, soft);
 611	if (err < 0) {
 612		/*
 613		 * OK, if the chip does not want to play nice let's
 614		 * try to reset it in more brutal way
 615		 */
 616		soft = false;
 617		err = si476x_core_stop(radio->core, soft);
 618		if (err < 0)
 619			return err;
 620	}
 621	/*
 622	  Set the desired radio tuner function
 623	 */
 624	radio->core->power_up_parameters.func = func;
 625
 626	err = si476x_core_start(radio->core, soft);
 627	if (err < 0)
 628		return err;
 629
 630	/*
 631	 * No need to do the rest of manipulations for the bootlader
 632	 * mode
 633	 */
 634	if (func != SI476X_FUNC_FM_RECEIVER &&
 635	    func != SI476X_FUNC_AM_RECEIVER)
 636		return err;
 637
 638	return si476x_radio_do_post_powerup_init(radio, func);
 639}
 640
 641static int si476x_radio_g_frequency(struct file *file, void *priv,
 642			      struct v4l2_frequency *f)
 643{
 644	int err;
 645	struct si476x_radio *radio = video_drvdata(file);
 646
 647	if (f->tuner != 0 ||
 648	    f->type  != V4L2_TUNER_RADIO)
 649		return -EINVAL;
 650
 651	si476x_core_lock(radio->core);
 652
 653	if (radio->ops->rsq_status) {
 654		struct si476x_rsq_status_report report;
 655		struct si476x_rsq_status_args   args = {
 656			.primary	= false,
 657			.rsqack		= false,
 658			.attune		= true,
 659			.cancel		= false,
 660			.stcack		= false,
 661		};
 662
 663		err = radio->ops->rsq_status(radio->core, &args, &report);
 664		if (!err)
 665			f->frequency = si476x_to_v4l2(radio->core,
 666						      report.readfreq);
 667	} else {
 668		err = -EINVAL;
 669	}
 670
 671	si476x_core_unlock(radio->core);
 672
 673	return err;
 674}
 675
 676static int si476x_radio_s_frequency(struct file *file, void *priv,
 677				    const struct v4l2_frequency *f)
 678{
 679	int err;
 680	u32 freq = f->frequency;
 681	struct si476x_tune_freq_args args;
 682	struct si476x_radio *radio = video_drvdata(file);
 683
 684	const u32 midrange = (si476x_bands[SI476X_BAND_AM].rangehigh +
 685			      si476x_bands[SI476X_BAND_FM].rangelow) / 2;
 686	const int band = (freq > midrange) ?
 687		SI476X_BAND_FM : SI476X_BAND_AM;
 688	const enum si476x_func func = (band == SI476X_BAND_AM) ?
 689		SI476X_FUNC_AM_RECEIVER : SI476X_FUNC_FM_RECEIVER;
 690
 691	if (f->tuner != 0 ||
 692	    f->type  != V4L2_TUNER_RADIO)
 693		return -EINVAL;
 694
 695	si476x_core_lock(radio->core);
 696
 697	freq = clamp(freq,
 698		     si476x_bands[band].rangelow,
 699		     si476x_bands[band].rangehigh);
 700
 701	if (si476x_radio_freq_is_inside_of_the_band(freq,
 702						    SI476X_BAND_AM) &&
 703	    (!si476x_core_has_am(radio->core) ||
 704	     si476x_core_is_a_secondary_tuner(radio->core))) {
 705		err = -EINVAL;
 706		goto unlock;
 707	}
 708
 709	err = si476x_radio_change_func(radio, func);
 710	if (err < 0)
 711		goto unlock;
 712
 713	args.zifsr		= false;
 714	args.hd			= false;
 715	args.injside		= SI476X_INJSIDE_AUTO;
 716	args.freq		= v4l2_to_si476x(radio->core, freq);
 717	args.tunemode		= SI476X_TM_VALIDATED_NORMAL_TUNE;
 718	args.smoothmetrics	= SI476X_SM_INITIALIZE_AUDIO;
 719	args.antcap		= 0;
 720
 721	err = radio->ops->tune_freq(radio->core, &args);
 722
 723unlock:
 724	si476x_core_unlock(radio->core);
 725	return err;
 726}
 727
 728static int si476x_radio_s_hw_freq_seek(struct file *file, void *priv,
 729				       const struct v4l2_hw_freq_seek *seek)
 730{
 731	int err;
 732	enum si476x_func func;
 733	u32 rangelow = seek->rangelow, rangehigh = seek->rangehigh;
 734	struct si476x_radio *radio = video_drvdata(file);
 735
 736	if (file->f_flags & O_NONBLOCK)
 737		return -EAGAIN;
 738
 739	if (seek->tuner != 0 ||
 740	    seek->type  != V4L2_TUNER_RADIO)
 741		return -EINVAL;
 742
 743	si476x_core_lock(radio->core);
 744
 745	if (!rangelow) {
 746		err = regmap_read(radio->core->regmap,
 747				  SI476X_PROP_SEEK_BAND_BOTTOM,
 748				  &rangelow);
 749		if (err)
 750			goto unlock;
 751		rangelow = si476x_to_v4l2(radio->core, rangelow);
 752	}
 753	if (!rangehigh) {
 754		err = regmap_read(radio->core->regmap,
 755				  SI476X_PROP_SEEK_BAND_TOP,
 756				  &rangehigh);
 757		if (err)
 758			goto unlock;
 759		rangehigh = si476x_to_v4l2(radio->core, rangehigh);
 760	}
 761
 762	if (rangelow > rangehigh) {
 763		err = -EINVAL;
 764		goto unlock;
 765	}
 766
 767	if (si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
 768						     SI476X_BAND_FM)) {
 769		func = SI476X_FUNC_FM_RECEIVER;
 770
 771	} else if (si476x_core_has_am(radio->core) &&
 772		   si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
 773							    SI476X_BAND_AM)) {
 774		func = SI476X_FUNC_AM_RECEIVER;
 775	} else {
 776		err = -EINVAL;
 777		goto unlock;
 778	}
 779
 780	err = si476x_radio_change_func(radio, func);
 781	if (err < 0)
 782		goto unlock;
 783
 784	if (seek->rangehigh) {
 785		err = regmap_write(radio->core->regmap,
 786				   SI476X_PROP_SEEK_BAND_TOP,
 787				   v4l2_to_si476x(radio->core,
 788						  seek->rangehigh));
 789		if (err)
 790			goto unlock;
 791	}
 792	if (seek->rangelow) {
 793		err = regmap_write(radio->core->regmap,
 794				   SI476X_PROP_SEEK_BAND_BOTTOM,
 795				   v4l2_to_si476x(radio->core,
 796						  seek->rangelow));
 797		if (err)
 798			goto unlock;
 799	}
 800	if (seek->spacing) {
 801		err = regmap_write(radio->core->regmap,
 802				     SI476X_PROP_SEEK_FREQUENCY_SPACING,
 803				     v4l2_to_si476x(radio->core,
 804						    seek->spacing));
 805		if (err)
 806			goto unlock;
 807	}
 808
 809	err = radio->ops->seek_start(radio->core,
 810				     seek->seek_upward,
 811				     seek->wrap_around);
 812unlock:
 813	si476x_core_unlock(radio->core);
 814
 815
 816
 817	return err;
 818}
 819
 820static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 821{
 822	int retval;
 823	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
 824
 825	si476x_core_lock(radio->core);
 826
 827	switch (ctrl->id) {
 828	case V4L2_CID_SI476X_INTERCHIP_LINK:
 829		if (si476x_core_has_diversity(radio->core)) {
 830			if (radio->ops->phase_diversity) {
 831				retval = radio->ops->phase_div_status(radio->core);
 832				if (retval < 0)
 833					break;
 834
 835				ctrl->val = !!SI476X_PHDIV_STATUS_LINK_LOCKED(retval);
 836				retval = 0;
 837				break;
 838			} else {
 839				retval = -ENOTTY;
 840				break;
 841			}
 842		}
 843		retval = -EINVAL;
 844		break;
 845	default:
 846		retval = -EINVAL;
 847		break;
 848	}
 849	si476x_core_unlock(radio->core);
 850	return retval;
 851
 852}
 853
 854static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl)
 855{
 856	int retval;
 857	enum si476x_phase_diversity_mode mode;
 858	struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
 859
 860	si476x_core_lock(radio->core);
 861
 862	switch (ctrl->id) {
 863	case V4L2_CID_SI476X_HARMONICS_COUNT:
 864		retval = regmap_update_bits(radio->core->regmap,
 865					    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 866					    SI476X_PROP_PWR_HARMONICS_MASK,
 867					    ctrl->val);
 868		break;
 869	case V4L2_CID_POWER_LINE_FREQUENCY:
 870		switch (ctrl->val) {
 871		case V4L2_CID_POWER_LINE_FREQUENCY_DISABLED:
 872			retval = regmap_update_bits(radio->core->regmap,
 873						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 874						    SI476X_PROP_PWR_ENABLE_MASK,
 875						    0);
 876			break;
 877		case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
 878			retval = regmap_update_bits(radio->core->regmap,
 879						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 880						    SI476X_PROP_PWR_GRID_MASK,
 881						    SI476X_PROP_PWR_GRID_50HZ);
 882			break;
 883		case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
 884			retval = regmap_update_bits(radio->core->regmap,
 885						    SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 886						    SI476X_PROP_PWR_GRID_MASK,
 887						    SI476X_PROP_PWR_GRID_60HZ);
 888			break;
 889		default:
 890			retval = -EINVAL;
 891			break;
 892		}
 893		break;
 894	case V4L2_CID_SI476X_RSSI_THRESHOLD:
 895		retval = regmap_write(radio->core->regmap,
 896				      SI476X_PROP_VALID_RSSI_THRESHOLD,
 897				      ctrl->val);
 898		break;
 899	case V4L2_CID_SI476X_SNR_THRESHOLD:
 900		retval = regmap_write(radio->core->regmap,
 901				      SI476X_PROP_VALID_SNR_THRESHOLD,
 902				      ctrl->val);
 903		break;
 904	case V4L2_CID_SI476X_MAX_TUNE_ERROR:
 905		retval = regmap_write(radio->core->regmap,
 906				      SI476X_PROP_VALID_MAX_TUNE_ERROR,
 907				      ctrl->val);
 908		break;
 909	case V4L2_CID_RDS_RECEPTION:
 910		/*
 911		 * It looks like RDS related properties are
 912		 * inaccessible when tuner is in AM mode, so cache the
 913		 * changes
 914		 */
 915		if (si476x_core_is_in_am_receiver_mode(radio->core))
 916			regcache_cache_only(radio->core->regmap, true);
 917
 918		if (ctrl->val) {
 919			retval = regmap_write(radio->core->regmap,
 920					      SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT,
 921					      radio->core->rds_fifo_depth);
 922			if (retval < 0)
 923				break;
 924
 925			if (radio->core->client->irq) {
 926				retval = regmap_write(radio->core->regmap,
 927						      SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
 928						      SI476X_RDSRECV);
 929				if (retval < 0)
 930					break;
 931			}
 932
 933			/* Drain RDS FIFO before enabling RDS processing */
 934			retval = si476x_core_cmd_fm_rds_status(radio->core,
 935							       false,
 936							       true,
 937							       true,
 938							       NULL);
 939			if (retval < 0)
 940				break;
 941
 942			retval = regmap_update_bits(radio->core->regmap,
 943						    SI476X_PROP_FM_RDS_CONFIG,
 944						    SI476X_PROP_RDSEN_MASK,
 945						    SI476X_PROP_RDSEN);
 946		} else {
 947			retval = regmap_update_bits(radio->core->regmap,
 948						    SI476X_PROP_FM_RDS_CONFIG,
 949						    SI476X_PROP_RDSEN_MASK,
 950						    !SI476X_PROP_RDSEN);
 951		}
 952
 953		if (si476x_core_is_in_am_receiver_mode(radio->core))
 954			regcache_cache_only(radio->core->regmap, false);
 955		break;
 956	case V4L2_CID_TUNE_DEEMPHASIS:
 957		retval = regmap_write(radio->core->regmap,
 958				      SI476X_PROP_AUDIO_DEEMPHASIS,
 959				      ctrl->val);
 960		break;
 961
 962	case V4L2_CID_SI476X_DIVERSITY_MODE:
 963		mode = si476x_phase_diversity_idx_to_mode(ctrl->val);
 964
 965		if (mode == radio->core->diversity_mode) {
 966			retval = 0;
 967			break;
 968		}
 969
 970		if (si476x_core_is_in_am_receiver_mode(radio->core)) {
 971			/*
 972			 * Diversity cannot be configured while tuner
 973			 * is in AM mode so save the changes and carry on.
 974			 */
 975			radio->core->diversity_mode = mode;
 976			retval = 0;
 977		} else {
 978			retval = radio->ops->phase_diversity(radio->core, mode);
 979			if (!retval)
 980				radio->core->diversity_mode = mode;
 981		}
 982		break;
 983
 984	default:
 985		retval = -EINVAL;
 986		break;
 987	}
 988
 989	si476x_core_unlock(radio->core);
 990
 991	return retval;
 992}
 993
 994#ifdef CONFIG_VIDEO_ADV_DEBUG
 995static int si476x_radio_g_register(struct file *file, void *fh,
 996				   struct v4l2_dbg_register *reg)
 997{
 998	int err;
 999	unsigned int value;
1000	struct si476x_radio *radio = video_drvdata(file);
1001
1002	si476x_core_lock(radio->core);
1003	reg->size = 2;
1004	err = regmap_read(radio->core->regmap,
1005			  (unsigned int)reg->reg, &value);
1006	reg->val = value;
1007	si476x_core_unlock(radio->core);
1008
1009	return err;
1010}
1011static int si476x_radio_s_register(struct file *file, void *fh,
1012				   const struct v4l2_dbg_register *reg)
1013{
1014
1015	int err;
1016	struct si476x_radio *radio = video_drvdata(file);
1017
1018	si476x_core_lock(radio->core);
1019	err = regmap_write(radio->core->regmap,
1020			   (unsigned int)reg->reg,
1021			   (unsigned int)reg->val);
1022	si476x_core_unlock(radio->core);
1023
1024	return err;
1025}
1026#endif
1027
1028static int si476x_radio_fops_open(struct file *file)
1029{
1030	struct si476x_radio *radio = video_drvdata(file);
1031	int err;
1032
1033	err = v4l2_fh_open(file);
1034	if (err)
1035		return err;
1036
1037	if (v4l2_fh_is_singular_file(file)) {
1038		si476x_core_lock(radio->core);
1039		err = si476x_core_set_power_state(radio->core,
1040						  SI476X_POWER_UP_FULL);
1041		if (err < 0)
1042			goto done;
1043
1044		err = si476x_radio_do_post_powerup_init(radio,
1045							radio->core->power_up_parameters.func);
1046		if (err < 0)
1047			goto power_down;
1048
1049		err = si476x_radio_pretune(radio,
1050					   radio->core->power_up_parameters.func);
1051		if (err < 0)
1052			goto power_down;
1053
1054		si476x_core_unlock(radio->core);
1055		/*Must be done after si476x_core_unlock to prevent a deadlock*/
1056		v4l2_ctrl_handler_setup(&radio->ctrl_handler);
1057	}
1058
1059	return err;
1060
1061power_down:
1062	si476x_core_set_power_state(radio->core,
1063				    SI476X_POWER_DOWN);
1064done:
1065	si476x_core_unlock(radio->core);
1066	v4l2_fh_release(file);
1067
1068	return err;
1069}
1070
1071static int si476x_radio_fops_release(struct file *file)
1072{
1073	struct si476x_radio *radio = video_drvdata(file);
1074
1075	if (v4l2_fh_is_singular_file(file) &&
1076	    atomic_read(&radio->core->is_alive))
1077		si476x_core_set_power_state(radio->core,
1078					    SI476X_POWER_DOWN);
1079
1080	return v4l2_fh_release(file);
1081}
1082
1083static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
1084				      size_t count, loff_t *ppos)
1085{
1086	ssize_t      rval;
1087	size_t       fifo_len;
1088	unsigned int copied;
1089
1090	struct si476x_radio *radio = video_drvdata(file);
1091
1092	/* block if no new data available */
1093	if (kfifo_is_empty(&radio->core->rds_fifo)) {
1094		if (file->f_flags & O_NONBLOCK)
1095			return -EWOULDBLOCK;
1096
1097		rval = wait_event_interruptible(radio->core->rds_read_queue,
1098						(!kfifo_is_empty(&radio->core->rds_fifo) ||
1099						 !atomic_read(&radio->core->is_alive)));
1100		if (rval < 0)
1101			return -EINTR;
1102
1103		if (!atomic_read(&radio->core->is_alive))
1104			return -ENODEV;
1105	}
1106
1107	fifo_len = kfifo_len(&radio->core->rds_fifo);
1108
1109	if (kfifo_to_user(&radio->core->rds_fifo, buf,
1110			  min(fifo_len, count),
1111			  &copied) != 0) {
1112		dev_warn(&radio->videodev.dev,
1113			 "Error during FIFO to userspace copy\n");
1114		rval = -EIO;
1115	} else {
1116		rval = (ssize_t)copied;
1117	}
1118
1119	return rval;
1120}
1121
1122static __poll_t si476x_radio_fops_poll(struct file *file,
1123				struct poll_table_struct *pts)
1124{
1125	struct si476x_radio *radio = video_drvdata(file);
1126	__poll_t req_events = poll_requested_events(pts);
1127	__poll_t err = v4l2_ctrl_poll(file, pts);
1128
1129	if (req_events & (EPOLLIN | EPOLLRDNORM)) {
1130		if (atomic_read(&radio->core->is_alive))
1131			poll_wait(file, &radio->core->rds_read_queue, pts);
1132
1133		if (!atomic_read(&radio->core->is_alive))
1134			err = EPOLLHUP;
1135
1136		if (!kfifo_is_empty(&radio->core->rds_fifo))
1137			err = EPOLLIN | EPOLLRDNORM;
1138	}
1139
1140	return err;
1141}
1142
1143static const struct v4l2_file_operations si476x_fops = {
1144	.owner			= THIS_MODULE,
1145	.read			= si476x_radio_fops_read,
1146	.poll			= si476x_radio_fops_poll,
1147	.unlocked_ioctl		= video_ioctl2,
1148	.open			= si476x_radio_fops_open,
1149	.release		= si476x_radio_fops_release,
1150};
1151
1152
1153static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
1154	.vidioc_querycap		= si476x_radio_querycap,
1155	.vidioc_g_tuner			= si476x_radio_g_tuner,
1156	.vidioc_s_tuner			= si476x_radio_s_tuner,
1157
1158	.vidioc_g_frequency		= si476x_radio_g_frequency,
1159	.vidioc_s_frequency		= si476x_radio_s_frequency,
1160	.vidioc_s_hw_freq_seek		= si476x_radio_s_hw_freq_seek,
1161	.vidioc_enum_freq_bands		= si476x_radio_enum_freq_bands,
1162
1163	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
1164	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
1165
1166#ifdef CONFIG_VIDEO_ADV_DEBUG
1167	.vidioc_g_register		= si476x_radio_g_register,
1168	.vidioc_s_register		= si476x_radio_s_register,
1169#endif
1170};
1171
1172
1173static const struct video_device si476x_viddev_template = {
1174	.fops			= &si476x_fops,
1175	.name			= DRIVER_NAME,
1176	.release		= video_device_release_empty,
1177};
1178
1179
1180
1181static ssize_t si476x_radio_read_acf_blob(struct file *file,
1182					  char __user *user_buf,
1183					  size_t count, loff_t *ppos)
1184{
1185	int err;
1186	struct si476x_radio *radio = file->private_data;
1187	struct si476x_acf_status_report report;
1188
1189	si476x_core_lock(radio->core);
1190	if (radio->ops->acf_status)
1191		err = radio->ops->acf_status(radio->core, &report);
1192	else
1193		err = -ENOENT;
1194	si476x_core_unlock(radio->core);
1195
1196	if (err < 0)
1197		return err;
1198
1199	return simple_read_from_buffer(user_buf, count, ppos, &report,
1200				       sizeof(report));
1201}
1202
1203static const struct file_operations radio_acf_fops = {
1204	.open	= simple_open,
1205	.llseek = default_llseek,
1206	.read	= si476x_radio_read_acf_blob,
1207};
1208
1209static ssize_t si476x_radio_read_rds_blckcnt_blob(struct file *file,
1210						  char __user *user_buf,
1211						  size_t count, loff_t *ppos)
1212{
1213	int err;
1214	struct si476x_radio *radio = file->private_data;
1215	struct si476x_rds_blockcount_report report;
1216
1217	si476x_core_lock(radio->core);
1218	if (radio->ops->rds_blckcnt)
1219		err = radio->ops->rds_blckcnt(radio->core, true,
1220					       &report);
1221	else
1222		err = -ENOENT;
1223	si476x_core_unlock(radio->core);
1224
1225	if (err < 0)
1226		return err;
1227
1228	return simple_read_from_buffer(user_buf, count, ppos, &report,
1229				       sizeof(report));
1230}
1231
1232static const struct file_operations radio_rds_blckcnt_fops = {
1233	.open	= simple_open,
1234	.llseek = default_llseek,
1235	.read	= si476x_radio_read_rds_blckcnt_blob,
1236};
1237
1238static ssize_t si476x_radio_read_agc_blob(struct file *file,
1239					  char __user *user_buf,
1240					  size_t count, loff_t *ppos)
1241{
1242	int err;
1243	struct si476x_radio *radio = file->private_data;
1244	struct si476x_agc_status_report report;
1245
1246	si476x_core_lock(radio->core);
1247	if (radio->ops->rds_blckcnt)
1248		err = radio->ops->agc_status(radio->core, &report);
1249	else
1250		err = -ENOENT;
1251	si476x_core_unlock(radio->core);
1252
1253	if (err < 0)
1254		return err;
1255
1256	return simple_read_from_buffer(user_buf, count, ppos, &report,
1257				       sizeof(report));
1258}
1259
1260static const struct file_operations radio_agc_fops = {
1261	.open	= simple_open,
1262	.llseek = default_llseek,
1263	.read	= si476x_radio_read_agc_blob,
1264};
1265
1266static ssize_t si476x_radio_read_rsq_blob(struct file *file,
1267					  char __user *user_buf,
1268					  size_t count, loff_t *ppos)
1269{
1270	int err;
1271	struct si476x_radio *radio = file->private_data;
1272	struct si476x_rsq_status_report report;
1273	struct si476x_rsq_status_args args = {
1274		.primary	= false,
1275		.rsqack		= false,
1276		.attune		= false,
1277		.cancel		= false,
1278		.stcack		= false,
1279	};
1280
1281	si476x_core_lock(radio->core);
1282	if (radio->ops->rds_blckcnt)
1283		err = radio->ops->rsq_status(radio->core, &args, &report);
1284	else
1285		err = -ENOENT;
1286	si476x_core_unlock(radio->core);
1287
1288	if (err < 0)
1289		return err;
1290
1291	return simple_read_from_buffer(user_buf, count, ppos, &report,
1292				       sizeof(report));
1293}
1294
1295static const struct file_operations radio_rsq_fops = {
1296	.open	= simple_open,
1297	.llseek = default_llseek,
1298	.read	= si476x_radio_read_rsq_blob,
1299};
1300
1301static ssize_t si476x_radio_read_rsq_primary_blob(struct file *file,
1302						  char __user *user_buf,
1303						  size_t count, loff_t *ppos)
1304{
1305	int err;
1306	struct si476x_radio *radio = file->private_data;
1307	struct si476x_rsq_status_report report;
1308	struct si476x_rsq_status_args args = {
1309		.primary	= true,
1310		.rsqack		= false,
1311		.attune		= false,
1312		.cancel		= false,
1313		.stcack		= false,
1314	};
1315
1316	si476x_core_lock(radio->core);
1317	if (radio->ops->rds_blckcnt)
1318		err = radio->ops->rsq_status(radio->core, &args, &report);
1319	else
1320		err = -ENOENT;
1321	si476x_core_unlock(radio->core);
1322
1323	if (err < 0)
1324		return err;
1325
1326	return simple_read_from_buffer(user_buf, count, ppos, &report,
1327				       sizeof(report));
1328}
1329
1330static const struct file_operations radio_rsq_primary_fops = {
1331	.open	= simple_open,
1332	.llseek = default_llseek,
1333	.read	= si476x_radio_read_rsq_primary_blob,
1334};
1335
1336
1337static void si476x_radio_init_debugfs(struct si476x_radio *radio)
1338{
1339	radio->debugfs = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
1340
1341	debugfs_create_file("acf", S_IRUGO, radio->debugfs, radio,
1342			    &radio_acf_fops);
1343
1344	debugfs_create_file("rds_blckcnt", S_IRUGO, radio->debugfs, radio,
1345			    &radio_rds_blckcnt_fops);
1346
1347	debugfs_create_file("agc", S_IRUGO, radio->debugfs, radio,
1348			    &radio_agc_fops);
1349
1350	debugfs_create_file("rsq", S_IRUGO, radio->debugfs, radio,
1351			    &radio_rsq_fops);
1352
1353	debugfs_create_file("rsq_primary", S_IRUGO, radio->debugfs, radio,
1354			    &radio_rsq_primary_fops);
1355}
1356
1357
1358static int si476x_radio_add_new_custom(struct si476x_radio *radio,
1359				       enum si476x_ctrl_idx idx)
1360{
1361	int rval;
1362	struct v4l2_ctrl *ctrl;
1363
1364	ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
1365				    &si476x_ctrls[idx],
1366				    NULL);
1367	rval = radio->ctrl_handler.error;
1368	if (ctrl == NULL && rval)
1369		dev_err(radio->v4l2dev.dev,
1370			"Could not initialize '%s' control %d\n",
1371			si476x_ctrls[idx].name, rval);
1372
1373	return rval;
1374}
1375
1376static int si476x_radio_probe(struct platform_device *pdev)
1377{
1378	int rval;
1379	struct si476x_radio *radio;
1380	struct v4l2_ctrl *ctrl;
1381
1382	static atomic_t instance = ATOMIC_INIT(0);
1383
1384	radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
1385	if (!radio)
1386		return -ENOMEM;
1387
1388	radio->core = i2c_mfd_cell_to_core(&pdev->dev);
1389
1390	v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
1391
1392	rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
1393	if (rval) {
1394		dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
1395		return rval;
1396	}
1397
1398	memcpy(&radio->videodev, &si476x_viddev_template,
1399	       sizeof(struct video_device));
1400
1401	radio->videodev.v4l2_dev  = &radio->v4l2dev;
1402	radio->videodev.ioctl_ops = &si4761_ioctl_ops;
1403	radio->videodev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
1404				      V4L2_CAP_HW_FREQ_SEEK;
1405
1406	si476x_core_lock(radio->core);
1407	if (!si476x_core_is_a_secondary_tuner(radio->core))
1408		radio->videodev.device_caps |= V4L2_CAP_RDS_CAPTURE |
1409					       V4L2_CAP_READWRITE;
1410	si476x_core_unlock(radio->core);
1411
1412	video_set_drvdata(&radio->videodev, radio);
1413	platform_set_drvdata(pdev, radio);
1414
1415
1416	radio->v4l2dev.ctrl_handler = &radio->ctrl_handler;
1417	v4l2_ctrl_handler_init(&radio->ctrl_handler,
1418			       1 + ARRAY_SIZE(si476x_ctrls));
1419
1420	if (si476x_core_has_am(radio->core)) {
1421		ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1422					      &si476x_ctrl_ops,
1423					      V4L2_CID_POWER_LINE_FREQUENCY,
1424					      V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
1425					      0, 0);
1426		rval = radio->ctrl_handler.error;
1427		if (ctrl == NULL && rval) {
1428			dev_err(&pdev->dev, "Could not initialize V4L2_CID_POWER_LINE_FREQUENCY control %d\n",
1429				rval);
1430			goto exit;
1431		}
1432
1433		rval = si476x_radio_add_new_custom(radio,
1434						   SI476X_IDX_HARMONICS_COUNT);
1435		if (rval < 0)
1436			goto exit;
1437	}
1438
1439	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RSSI_THRESHOLD);
1440	if (rval < 0)
1441		goto exit;
1442
1443	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_SNR_THRESHOLD);
1444	if (rval < 0)
1445		goto exit;
1446
1447	rval = si476x_radio_add_new_custom(radio, SI476X_IDX_MAX_TUNE_ERROR);
1448	if (rval < 0)
1449		goto exit;
1450
1451	ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1452				      &si476x_ctrl_ops,
1453				      V4L2_CID_TUNE_DEEMPHASIS,
1454				      V4L2_DEEMPHASIS_75_uS, 0, 0);
1455	rval = radio->ctrl_handler.error;
1456	if (ctrl == NULL && rval) {
1457		dev_err(&pdev->dev, "Could not initialize V4L2_CID_TUNE_DEEMPHASIS control %d\n",
1458			rval);
1459		goto exit;
1460	}
1461
1462	ctrl = v4l2_ctrl_new_std(&radio->ctrl_handler, &si476x_ctrl_ops,
1463				 V4L2_CID_RDS_RECEPTION,
1464				 0, 1, 1, 1);
1465	rval = radio->ctrl_handler.error;
1466	if (ctrl == NULL && rval) {
1467		dev_err(&pdev->dev, "Could not initialize V4L2_CID_RDS_RECEPTION control %d\n",
1468			rval);
1469		goto exit;
1470	}
1471
1472	if (si476x_core_has_diversity(radio->core)) {
1473		si476x_ctrls[SI476X_IDX_DIVERSITY_MODE].def =
1474			si476x_phase_diversity_mode_to_idx(radio->core->diversity_mode);
1475		rval = si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
1476		if (rval < 0)
1477			goto exit;
1478
1479		rval = si476x_radio_add_new_custom(radio, SI476X_IDX_INTERCHIP_LINK);
1480		if (rval < 0)
1481			goto exit;
1482	}
1483
1484	/* register video device */
1485	rval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, -1);
1486	if (rval < 0) {
1487		dev_err(&pdev->dev, "Could not register video device\n");
1488		goto exit;
1489	}
1490
1491	si476x_radio_init_debugfs(radio);
1492
1493	return 0;
1494exit:
1495	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1496	return rval;
1497}
1498
1499static void si476x_radio_remove(struct platform_device *pdev)
1500{
1501	struct si476x_radio *radio = platform_get_drvdata(pdev);
1502
1503	v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1504	video_unregister_device(&radio->videodev);
1505	v4l2_device_unregister(&radio->v4l2dev);
1506	debugfs_remove_recursive(radio->debugfs);
1507}
1508
1509MODULE_ALIAS("platform:si476x-radio");
1510
1511static struct platform_driver si476x_radio_driver = {
1512	.driver		= {
1513		.name	= DRIVER_NAME,
1514	},
1515	.probe		= si476x_radio_probe,
1516	.remove		= si476x_radio_remove,
1517};
1518module_platform_driver(si476x_radio_driver);
1519
1520MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
1521MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
1522MODULE_LICENSE("GPL");