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