drivers/media/radio/radio-si476x.c

   1 /*
   2  * drivers/media/radio/radio-si476x.c -- V4L2 driver for SI476X chips
   3  *
   4  * Copyright (C) 2012 Innovative Converged Devices(ICD)
   5  * Copyright (C) 2013 Andrey Smirnov
   6  *
   7  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; version 2 of the License.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/delay.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/slab.h>
  24 #include <linux/atomic.h>
  25 #include <linux/videodev2.h>
  26 #include <linux/mutex.h>
  27 #include <linux/debugfs.h>
  28 #include <media/v4l2-common.h>
  29 #include <media/v4l2-ioctl.h>
  30 #include <media/v4l2-ctrls.h>
  31 #include <media/v4l2-event.h>
  32 #include <media/v4l2-device.h>
  33
  34 #include <media/si476x.h>
  35 #include <linux/mfd/si476x-core.h>
  36
  37 #define FM_FREQ_RANGE_LOW   64000000
  38 #define FM_FREQ_RANGE_HIGH 108000000
  39
  40 #define AM_FREQ_RANGE_LOW    520000
  41 #define AM_FREQ_RANGE_HIGH 30000000
  42
  43 #define PWRLINEFLTR (1 << 8)
  44
  45 #define FREQ_MUL (10000000 / 625)
  46
  47 #define SI476X_PHDIV_STATUS_LINK_LOCKED(status) (0x80 & (status))
  48
  49 #define DRIVER_NAME "si476x-radio"
  50 #define DRIVER_CARD "SI476x AM/FM Receiver"
  51
  52 enum si476x_freq_bands {
  53         SI476X_BAND_FM,
  54         SI476X_BAND_AM,
  55 };
  56
  57 static const struct v4l2_frequency_band si476x_bands[] = {
  58         [SI476X_BAND_FM] = {
  59                 .type           = V4L2_TUNER_RADIO,
  60                 .index          = SI476X_BAND_FM,
  61                 .capability     = V4L2_TUNER_CAP_LOW
  62                 | V4L2_TUNER_CAP_STEREO
  63                 | V4L2_TUNER_CAP_RDS
  64                 | V4L2_TUNER_CAP_RDS_BLOCK_IO
  65                 | V4L2_TUNER_CAP_FREQ_BANDS,
  66                 .rangelow       =  64 * FREQ_MUL,
  67                 .rangehigh      = 108 * FREQ_MUL,
  68                 .modulation     = V4L2_BAND_MODULATION_FM,
  69         },
  70         [SI476X_BAND_AM] = {
  71                 .type           = V4L2_TUNER_RADIO,
  72                 .index          = SI476X_BAND_AM,
  73                 .capability     = V4L2_TUNER_CAP_LOW
  74                 | V4L2_TUNER_CAP_FREQ_BANDS,
  75                 .rangelow       = 0.52 * FREQ_MUL,
  76                 .rangehigh      = 30 * FREQ_MUL,
  77                 .modulation     = V4L2_BAND_MODULATION_AM,
  78         },
  79 };
  80
  81 static inline bool si476x_radio_freq_is_inside_of_the_band(u32 freq, int band)
  82 {
  83         return freq >= si476x_bands[band].rangelow &&
  84                 freq <= si476x_bands[band].rangehigh;
  85 }
  86
  87 static inline bool si476x_radio_range_is_inside_of_the_band(u32 low, u32 high,
  88                                                             int band)
  89 {
  90         return low  >= si476x_bands[band].rangelow &&
  91                 high <= si476x_bands[band].rangehigh;
  92 }
  93
  94 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl);
  95 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
  96
  97 enum phase_diversity_modes_idx {
  98         SI476X_IDX_PHDIV_DISABLED,
  99         SI476X_IDX_PHDIV_PRIMARY_COMBINING,
 100         SI476X_IDX_PHDIV_PRIMARY_ANTENNA,
 101         SI476X_IDX_PHDIV_SECONDARY_ANTENNA,
 102         SI476X_IDX_PHDIV_SECONDARY_COMBINING,
 103 };
 104
 105 static const char * const phase_diversity_modes[] = {
 106         [SI476X_IDX_PHDIV_DISABLED]             = "Disabled",
 107         [SI476X_IDX_PHDIV_PRIMARY_COMBINING]    = "Primary with Secondary",
 108         [SI476X_IDX_PHDIV_PRIMARY_ANTENNA]      = "Primary Antenna",
 109         [SI476X_IDX_PHDIV_SECONDARY_ANTENNA]    = "Secondary Antenna",
 110         [SI476X_IDX_PHDIV_SECONDARY_COMBINING]  = "Secondary with Primary",
 111 };
 112
 113 static inline enum phase_diversity_modes_idx
 114 si476x_phase_diversity_mode_to_idx(enum si476x_phase_diversity_mode mode)
 115 {
 116         switch (mode) {
 117         default:                /* FALLTHROUGH */
 118         case SI476X_PHDIV_DISABLED:
 119                 return SI476X_IDX_PHDIV_DISABLED;
 120         case SI476X_PHDIV_PRIMARY_COMBINING:
 121                 return SI476X_IDX_PHDIV_PRIMARY_COMBINING;
 122         case SI476X_PHDIV_PRIMARY_ANTENNA:
 123                 return SI476X_IDX_PHDIV_PRIMARY_ANTENNA;
 124         case SI476X_PHDIV_SECONDARY_ANTENNA:
 125                 return SI476X_IDX_PHDIV_SECONDARY_ANTENNA;
 126         case SI476X_PHDIV_SECONDARY_COMBINING:
 127                 return SI476X_IDX_PHDIV_SECONDARY_COMBINING;
 128         }
 129 }
 130
 131 static inline enum si476x_phase_diversity_mode
 132 si476x_phase_diversity_idx_to_mode(enum phase_diversity_modes_idx idx)
 133 {
 134         static const int idx_to_value[] = {
 135                 [SI476X_IDX_PHDIV_DISABLED]             = SI476X_PHDIV_DISABLED,
 136                 [SI476X_IDX_PHDIV_PRIMARY_COMBINING]    = SI476X_PHDIV_PRIMARY_COMBINING,
 137                 [SI476X_IDX_PHDIV_PRIMARY_ANTENNA]      = SI476X_PHDIV_PRIMARY_ANTENNA,
 138                 [SI476X_IDX_PHDIV_SECONDARY_ANTENNA]    = SI476X_PHDIV_SECONDARY_ANTENNA,
 139                 [SI476X_IDX_PHDIV_SECONDARY_COMBINING]  = SI476X_PHDIV_SECONDARY_COMBINING,
 140         };
 141
 142         return idx_to_value[idx];
 143 }
 144
 145 static const struct v4l2_ctrl_ops si476x_ctrl_ops = {
 146         .g_volatile_ctrl        = si476x_radio_g_volatile_ctrl,
 147         .s_ctrl                 = si476x_radio_s_ctrl,
 148 };
 149
 150
 151 enum si476x_ctrl_idx {
 152         SI476X_IDX_RSSI_THRESHOLD,
 153         SI476X_IDX_SNR_THRESHOLD,
 154         SI476X_IDX_MAX_TUNE_ERROR,
 155         SI476X_IDX_HARMONICS_COUNT,
 156         SI476X_IDX_DIVERSITY_MODE,
 157         SI476X_IDX_INTERCHIP_LINK,
 158 };
 159 static struct v4l2_ctrl_config si476x_ctrls[] = {
 160
 161         /**
 162          * SI476X during its station seeking(or tuning) process uses several
 163          * parameters to detrmine if "the station" is valid:
 164          *
 165          *      - Signal's SNR(in dBuV) must be lower than
 166          *      #V4L2_CID_SI476X_SNR_THRESHOLD
 167          *      - Signal's RSSI(in dBuV) must be greater than
 168          *      #V4L2_CID_SI476X_RSSI_THRESHOLD
 169          *      - Signal's frequency deviation(in units of 2ppm) must not be
 170          *      more than #V4L2_CID_SI476X_MAX_TUNE_ERROR
 171          */
 172         [SI476X_IDX_RSSI_THRESHOLD] = {
 173                 .ops    = &si476x_ctrl_ops,
 174                 .id     = V4L2_CID_SI476X_RSSI_THRESHOLD,
 175                 .name   = "Valid RSSI Threshold",
 176                 .type   = V4L2_CTRL_TYPE_INTEGER,
 177                 .min    = -128,
 178                 .max    = 127,
 179                 .step   = 1,
 180         },
 181         [SI476X_IDX_SNR_THRESHOLD] = {
 182                 .ops    = &si476x_ctrl_ops,
 183                 .id     = V4L2_CID_SI476X_SNR_THRESHOLD,
 184                 .type   = V4L2_CTRL_TYPE_INTEGER,
 185                 .name   = "Valid SNR Threshold",
 186                 .min    = -128,
 187                 .max    = 127,
 188                 .step   = 1,
 189         },
 190         [SI476X_IDX_MAX_TUNE_ERROR] = {
 191                 .ops    = &si476x_ctrl_ops,
 192                 .id     = V4L2_CID_SI476X_MAX_TUNE_ERROR,
 193                 .type   = V4L2_CTRL_TYPE_INTEGER,
 194                 .name   = "Max Tune Errors",
 195                 .min    = 0,
 196                 .max    = 126 * 2,
 197                 .step   = 2,
 198         },
 199
 200         /**
 201          * #V4L2_CID_SI476X_HARMONICS_COUNT -- number of harmonics
 202          * built-in power-line noise supression filter is to reject
 203          * during AM-mode operation.
 204          */
 205         [SI476X_IDX_HARMONICS_COUNT] = {
 206                 .ops    = &si476x_ctrl_ops,
 207                 .id     = V4L2_CID_SI476X_HARMONICS_COUNT,
 208                 .type   = V4L2_CTRL_TYPE_INTEGER,
 209
 210                 .name   = "Count of Harmonics to Reject",
 211                 .min    = 0,
 212                 .max    = 20,
 213                 .step   = 1,
 214         },
 215
 216         /**
 217          * #V4L2_CID_SI476X_DIVERSITY_MODE -- configuration which
 218          * two tuners working in diversity mode are to work in.
 219          *
 220          *  - #SI476X_IDX_PHDIV_DISABLED diversity mode disabled
 221          *  - #SI476X_IDX_PHDIV_PRIMARY_COMBINING diversity mode is
 222          *  on, primary tuner's antenna is the main one.
 223          *  - #SI476X_IDX_PHDIV_PRIMARY_ANTENNA diversity mode is
 224          *  off, primary tuner's antenna is the main one.
 225          *  - #SI476X_IDX_PHDIV_SECONDARY_ANTENNA diversity mode is
 226          *  off, secondary tuner's antenna is the main one.
 227          *  - #SI476X_IDX_PHDIV_SECONDARY_COMBINING diversity mode is
 228          *  on, secondary tuner's antenna is the main one.
 229          */
 230         [SI476X_IDX_DIVERSITY_MODE] = {
 231                 .ops    = &si476x_ctrl_ops,
 232                 .id     = V4L2_CID_SI476X_DIVERSITY_MODE,
 233                 .type   = V4L2_CTRL_TYPE_MENU,
 234                 .name   = "Phase Diversity Mode",
 235                 .qmenu  = phase_diversity_modes,
 236                 .min    = 0,
 237                 .max    = ARRAY_SIZE(phase_diversity_modes) - 1,
 238         },
 239
 240         /**
 241          * #V4L2_CID_SI476X_INTERCHIP_LINK -- inter-chip link in
 242          * diversity mode indicator. Allows user to determine if two
 243          * chips working in diversity mode have established a link
 244          * between each other and if the system as a whole uses
 245          * signals from both antennas to receive FM radio.
 246          */
 247         [SI476X_IDX_INTERCHIP_LINK] = {
 248                 .ops    = &si476x_ctrl_ops,
 249                 .id     = V4L2_CID_SI476X_INTERCHIP_LINK,
 250                 .type   = V4L2_CTRL_TYPE_BOOLEAN,
 251                 .flags  = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_VOLATILE,
 252                 .name   = "Inter-Chip Link",
 253                 .min    = 0,
 254                 .max    = 1,
 255                 .step   = 1,
 256         },
 257 };
 258
 259 struct si476x_radio;
 260
 261 /**
 262  * struct si476x_radio_ops - vtable of tuner functions
 263  *
 264  * This table holds pointers to functions implementing particular
 265  * operations depending on the mode in which the tuner chip was
 266  * configured to start in. If the function is not supported
 267  * corresponding element is set to #NULL.
 268  *
 269  * @tune_freq: Tune chip to a specific frequency
 270  * @seek_start: Star station seeking
 271  * @rsq_status: Get Received Signal Quality(RSQ) status
 272  * @rds_blckcnt: Get received RDS blocks count
 273  * @phase_diversity: Change phase diversity mode of the tuner
 274  * @phase_div_status: Get phase diversity mode status
 275  * @acf_status: Get the status of Automatically Controlled
 276  * Features(ACF)
 277  * @agc_status: Get Automatic Gain Control(AGC) status
 278  */
 279 struct si476x_radio_ops {
 280         int (*tune_freq)(struct si476x_core *, struct si476x_tune_freq_args *);
 281         int (*seek_start)(struct si476x_core *, bool, bool);
 282         int (*rsq_status)(struct si476x_core *, struct si476x_rsq_status_args *,
 283                           struct si476x_rsq_status_report *);
 284         int (*rds_blckcnt)(struct si476x_core *, bool,
 285                            struct si476x_rds_blockcount_report *);
 286
 287         int (*phase_diversity)(struct si476x_core *,
 288                                enum si476x_phase_diversity_mode);
 289         int (*phase_div_status)(struct si476x_core *);
 290         int (*acf_status)(struct si476x_core *,
 291                           struct si476x_acf_status_report *);
 292         int (*agc_status)(struct si476x_core *,
 293                           struct si476x_agc_status_report *);
 294 };
 295
 296 /**
 297  * struct si476x_radio - radio device
 298  *
 299  * @core: Pointer to underlying core device
 300  * @videodev: Pointer to video device created by V4L2 subsystem
 301  * @ops: Vtable of functions. See struct si476x_radio_ops for details
 302  * @kref: Reference counter
 303  * @core_lock: An r/w semaphore to brebvent the deletion of underlying
 304  * core structure is the radio device is being used
 305  */
 306 struct si476x_radio {
 307         struct v4l2_device v4l2dev;
 308         struct video_device videodev;
 309         struct v4l2_ctrl_handler ctrl_handler;
 310
 311         struct si476x_core  *core;
 312         /* This field should not be accesses unless core lock is held */
 313         const struct si476x_radio_ops *ops;
 314
 315         struct dentry   *debugfs;
 316         u32 audmode;
 317 };
 318
 319 static inline struct si476x_radio *
 320 v4l2_dev_to_radio(struct v4l2_device *d)
 321 {
 322         return container_of(d, struct si476x_radio, v4l2dev);
 323 }
 324
 325 static inline struct si476x_radio *
 326 v4l2_ctrl_handler_to_radio(struct v4l2_ctrl_handler *d)
 327 {
 328         return container_of(d, struct si476x_radio, ctrl_handler);
 329 }
 330
 331 /*
 332  * si476x_vidioc_querycap - query device capabilities
 333  */
 334 static int si476x_radio_querycap(struct file *file, void *priv,
 335                                  struct v4l2_capability *capability)
 336 {
 337         struct si476x_radio *radio = video_drvdata(file);
 338
 339         strlcpy(capability->driver, radio->v4l2dev.name,
 340                 sizeof(capability->driver));
 341         strlcpy(capability->card,   DRIVER_CARD, sizeof(capability->card));
 342         snprintf(capability->bus_info, sizeof(capability->bus_info),
 343                  "platform:%s", radio->v4l2dev.name);
 344
 345         capability->device_caps = V4L2_CAP_TUNER
 346                 | V4L2_CAP_RADIO
 347                 | V4L2_CAP_HW_FREQ_SEEK;
 348
 349         si476x_core_lock(radio->core);
 350         if (!si476x_core_is_a_secondary_tuner(radio->core))
 351                 capability->device_caps |= V4L2_CAP_RDS_CAPTURE
 352                         | V4L2_CAP_READWRITE;
 353         si476x_core_unlock(radio->core);
 354
 355         capability->capabilities = capability->device_caps
 356                 | V4L2_CAP_DEVICE_CAPS;
 357         return 0;
 358 }
 359
 360 static int si476x_radio_enum_freq_bands(struct file *file, void *priv,
 361                                         struct v4l2_frequency_band *band)
 362 {
 363         int err;
 364         struct si476x_radio *radio = video_drvdata(file);
 365
 366         if (band->tuner != 0)
 367                 return -EINVAL;
 368
 369         switch (radio->core->chip_id) {
 370                 /* AM/FM tuners -- all bands are supported */
 371         case SI476X_CHIP_SI4761:
 372         case SI476X_CHIP_SI4764:
 373                 if (band->index < ARRAY_SIZE(si476x_bands)) {
 374                         *band = si476x_bands[band->index];
 375                         err = 0;
 376                 } else {
 377                         err = -EINVAL;
 378                 }
 379                 break;
 380                 /* FM companion tuner chips -- only FM bands are
 381                  * supported */
 382         case SI476X_CHIP_SI4768:
 383                 if (band->index == SI476X_BAND_FM) {
 384                         *band = si476x_bands[band->index];
 385                         err = 0;
 386                 } else {
 387                         err = -EINVAL;
 388                 }
 389                 break;
 390         default:
 391                 err = -EINVAL;
 392         }
 393
 394         return err;
 395 }
 396
 397 static int si476x_radio_g_tuner(struct file *file, void *priv,
 398                                 struct v4l2_tuner *tuner)
 399 {
 400         int err;
 401         struct si476x_rsq_status_report report;
 402         struct si476x_radio *radio = video_drvdata(file);
 403
 404         struct si476x_rsq_status_args args = {
 405                 .primary        = false,
 406                 .rsqack         = false,
 407                 .attune         = false,
 408                 .cancel         = false,
 409                 .stcack         = false,
 410         };
 411
 412         if (tuner->index != 0)
 413                 return -EINVAL;
 414
 415         tuner->type       = V4L2_TUNER_RADIO;
 416         tuner->capability = V4L2_TUNER_CAP_LOW /* Measure frequencies
 417                                                  * in multiples of
 418                                                  * 62.5 Hz */
 419                 | V4L2_TUNER_CAP_STEREO
 420                 | V4L2_TUNER_CAP_HWSEEK_BOUNDED
 421                 | V4L2_TUNER_CAP_HWSEEK_WRAP
 422                 | V4L2_TUNER_CAP_HWSEEK_PROG_LIM;
 423
 424         si476x_core_lock(radio->core);
 425
 426         if (si476x_core_is_a_secondary_tuner(radio->core)) {
 427                 strlcpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
 428                 tuner->rxsubchans = 0;
 429                 tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
 430         } else if (si476x_core_has_am(radio->core)) {
 431                 if (si476x_core_is_a_primary_tuner(radio->core))
 432                         strlcpy(tuner->name, "AM/FM (primary)",
 433                                 sizeof(tuner->name));
 434                 else
 435                         strlcpy(tuner->name, "AM/FM", sizeof(tuner->name));
 436
 437                 tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO
 438                         | V4L2_TUNER_SUB_RDS;
 439                 tuner->capability |= V4L2_TUNER_CAP_RDS
 440                         | V4L2_TUNER_CAP_RDS_BLOCK_IO
 441                         | V4L2_TUNER_CAP_FREQ_BANDS;
 442
 443                 tuner->rangelow = si476x_bands[SI476X_BAND_AM].rangelow;
 444         } else {
 445                 strlcpy(tuner->name, "FM", sizeof(tuner->name));
 446                 tuner->rxsubchans = V4L2_TUNER_SUB_RDS;
 447                 tuner->capability |= V4L2_TUNER_CAP_RDS
 448                         | V4L2_TUNER_CAP_RDS_BLOCK_IO
 449                         | V4L2_TUNER_CAP_FREQ_BANDS;
 450                 tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
 451         }
 452
 453         tuner->audmode = radio->audmode;
 454
 455         tuner->afc = 1;
 456         tuner->rangehigh = si476x_bands[SI476X_BAND_FM].rangehigh;
 457
 458         err = radio->ops->rsq_status(radio->core,
 459                                      &args, &report);
 460         if (err < 0) {
 461                 tuner->signal = 0;
 462         } else {
 463                 /*
 464                  * tuner->signal value range: 0x0000 .. 0xFFFF,
 465                  * report.rssi: -128 .. 127
 466                  */
 467                 tuner->signal = (report.rssi + 128) * 257;
 468         }
 469         si476x_core_unlock(radio->core);
 470
 471         return err;
 472 }
 473
 474 static int si476x_radio_s_tuner(struct file *file, void *priv,
 475                                 const struct v4l2_tuner *tuner)
 476 {
 477         struct si476x_radio *radio = video_drvdata(file);
 478
 479         if (tuner->index != 0)
 480                 return -EINVAL;
 481
 482         if (tuner->audmode == V4L2_TUNER_MODE_MONO ||
 483             tuner->audmode == V4L2_TUNER_MODE_STEREO)
 484                 radio->audmode = tuner->audmode;
 485         else
 486                 radio->audmode = V4L2_TUNER_MODE_STEREO;
 487
 488         return 0;
 489 }
 490
 491 static int si476x_radio_init_vtable(struct si476x_radio *radio,
 492                                     enum si476x_func func)
 493 {
 494         static const struct si476x_radio_ops fm_ops = {
 495                 .tune_freq              = si476x_core_cmd_fm_tune_freq,
 496                 .seek_start             = si476x_core_cmd_fm_seek_start,
 497                 .rsq_status             = si476x_core_cmd_fm_rsq_status,
 498                 .rds_blckcnt            = si476x_core_cmd_fm_rds_blockcount,
 499                 .phase_diversity        = si476x_core_cmd_fm_phase_diversity,
 500                 .phase_div_status       = si476x_core_cmd_fm_phase_div_status,
 501                 .acf_status             = si476x_core_cmd_fm_acf_status,
 502                 .agc_status             = si476x_core_cmd_agc_status,
 503         };
 504
 505         static const struct si476x_radio_ops am_ops = {
 506                 .tune_freq              = si476x_core_cmd_am_tune_freq,
 507                 .seek_start             = si476x_core_cmd_am_seek_start,
 508                 .rsq_status             = si476x_core_cmd_am_rsq_status,
 509                 .rds_blckcnt            = NULL,
 510                 .phase_diversity        = NULL,
 511                 .phase_div_status       = NULL,
 512                 .acf_status             = si476x_core_cmd_am_acf_status,
 513                 .agc_status             = NULL,
 514         };
 515
 516         switch (func) {
 517         case SI476X_FUNC_FM_RECEIVER:
 518                 radio->ops = &fm_ops;
 519                 return 0;
 520
 521         case SI476X_FUNC_AM_RECEIVER:
 522                 radio->ops = &am_ops;
 523                 return 0;
 524         default:
 525                 WARN(1, "Unexpected tuner function value\n");
 526                 return -EINVAL;
 527         }
 528 }
 529
 530 static int si476x_radio_pretune(struct si476x_radio *radio,
 531                                 enum si476x_func func)
 532 {
 533         int retval;
 534
 535         struct si476x_tune_freq_args args = {
 536                 .zifsr          = false,
 537                 .hd             = false,
 538                 .injside        = SI476X_INJSIDE_AUTO,
 539                 .tunemode       = SI476X_TM_VALIDATED_NORMAL_TUNE,
 540                 .smoothmetrics  = SI476X_SM_INITIALIZE_AUDIO,
 541                 .antcap         = 0,
 542         };
 543
 544         switch (func) {
 545         case SI476X_FUNC_FM_RECEIVER:
 546                 args.freq = v4l2_to_si476x(radio->core,
 547                                            92 * FREQ_MUL);
 548                 retval = radio->ops->tune_freq(radio->core, &args);
 549                 break;
 550         case SI476X_FUNC_AM_RECEIVER:
 551                 args.freq = v4l2_to_si476x(radio->core,
 552                                            0.6 * FREQ_MUL);
 553                 retval = radio->ops->tune_freq(radio->core, &args);
 554                 break;
 555         default:
 556                 WARN(1, "Unexpected tuner function value\n");
 557                 retval = -EINVAL;
 558         }
 559
 560         return retval;
 561 }
 562 static int si476x_radio_do_post_powerup_init(struct si476x_radio *radio,
 563                                              enum si476x_func func)
 564 {
 565         int err;
 566
 567         /* regcache_mark_dirty(radio->core->regmap); */
 568         err = regcache_sync_region(radio->core->regmap,
 569                                    SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE,
 570                                    SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT);
 571                 if (err < 0)
 572                         return err;
 573
 574         err = regcache_sync_region(radio->core->regmap,
 575                                    SI476X_PROP_AUDIO_DEEMPHASIS,
 576                                    SI476X_PROP_AUDIO_PWR_LINE_FILTER);
 577         if (err < 0)
 578                 return err;
 579
 580         err = regcache_sync_region(radio->core->regmap,
 581                                    SI476X_PROP_INT_CTL_ENABLE,
 582                                    SI476X_PROP_INT_CTL_ENABLE);
 583         if (err < 0)
 584                 return err;
 585
 586         /*
 587          * Is there any point in restoring SNR and the like
 588          * when switching between AM/FM?
 589          */
 590         err = regcache_sync_region(radio->core->regmap,
 591                                    SI476X_PROP_VALID_MAX_TUNE_ERROR,
 592                                    SI476X_PROP_VALID_MAX_TUNE_ERROR);
 593         if (err < 0)
 594                 return err;
 595
 596         err = regcache_sync_region(radio->core->regmap,
 597                                    SI476X_PROP_VALID_SNR_THRESHOLD,
 598                                    SI476X_PROP_VALID_RSSI_THRESHOLD);
 599         if (err < 0)
 600                 return err;
 601
 602         if (func == SI476X_FUNC_FM_RECEIVER) {
 603                 if (si476x_core_has_diversity(radio->core)) {
 604                         err = si476x_core_cmd_fm_phase_diversity(radio->core,
 605                                                                  radio->core->diversity_mode);
 606                         if (err < 0)
 607                                 return err;
 608                 }
 609
 610                 err = regcache_sync_region(radio->core->regmap,
 611                                            SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
 612                                            SI476X_PROP_FM_RDS_CONFIG);
 613                 if (err < 0)
 614                         return err;
 615         }
 616
 617         return si476x_radio_init_vtable(radio, func);
 618
 619 }
 620
 621 static int si476x_radio_change_func(struct si476x_radio *radio,
 622                                     enum si476x_func func)
 623 {
 624         int err;
 625         bool soft;
 626         /*
 627          * Since power/up down is a very time consuming operation,
 628          * try to avoid doing it if the requested mode matches the one
 629          * the tuner is in
 630          */
 631         if (func == radio->core->power_up_parameters.func)
 632                 return 0;
 633
 634         soft = true;
 635         err = si476x_core_stop(radio->core, soft);
 636         if (err < 0) {
 637                 /*
 638                  * OK, if the chip does not want to play nice let's
 639                  * try to reset it in more brutal way
 640                  */
 641                 soft = false;
 642                 err = si476x_core_stop(radio->core, soft);
 643                 if (err < 0)
 644                         return err;
 645         }
 646         /*
 647           Set the desired radio tuner function
 648          */
 649         radio->core->power_up_parameters.func = func;
 650
 651         err = si476x_core_start(radio->core, soft);
 652         if (err < 0)
 653                 return err;
 654
 655         /*
 656          * No need to do the rest of manipulations for the bootlader
 657          * mode
 658          */
 659         if (func != SI476X_FUNC_FM_RECEIVER &&
 660             func != SI476X_FUNC_AM_RECEIVER)
 661                 return err;
 662
 663         return si476x_radio_do_post_powerup_init(radio, func);
 664 }
 665
 666 static int si476x_radio_g_frequency(struct file *file, void *priv,
 667                               struct v4l2_frequency *f)
 668 {
 669         int err;
 670         struct si476x_radio *radio = video_drvdata(file);
 671
 672         if (f->tuner != 0 ||
 673             f->type  != V4L2_TUNER_RADIO)
 674                 return -EINVAL;
 675
 676         si476x_core_lock(radio->core);
 677
 678         if (radio->ops->rsq_status) {
 679                 struct si476x_rsq_status_report report;
 680                 struct si476x_rsq_status_args   args = {
 681                         .primary        = false,
 682                         .rsqack         = false,
 683                         .attune         = true,
 684                         .cancel         = false,
 685                         .stcack         = false,
 686                 };
 687
 688                 err = radio->ops->rsq_status(radio->core, &args, &report);
 689                 if (!err)
 690                         f->frequency = si476x_to_v4l2(radio->core,
 691                                                       report.readfreq);
 692         } else {
 693                 err = -EINVAL;
 694         }
 695
 696         si476x_core_unlock(radio->core);
 697
 698         return err;
 699 }
 700
 701 static int si476x_radio_s_frequency(struct file *file, void *priv,
 702                                     const struct v4l2_frequency *f)
 703 {
 704         int err;
 705         u32 freq = f->frequency;
 706         struct si476x_tune_freq_args args;
 707         struct si476x_radio *radio = video_drvdata(file);
 708
 709         const u32 midrange = (si476x_bands[SI476X_BAND_AM].rangehigh +
 710                               si476x_bands[SI476X_BAND_FM].rangelow) / 2;
 711         const int band = (freq > midrange) ?
 712                 SI476X_BAND_FM : SI476X_BAND_AM;
 713         const enum si476x_func func = (band == SI476X_BAND_AM) ?
 714                 SI476X_FUNC_AM_RECEIVER : SI476X_FUNC_FM_RECEIVER;
 715
 716         if (f->tuner != 0 ||
 717             f->type  != V4L2_TUNER_RADIO)
 718                 return -EINVAL;
 719
 720         si476x_core_lock(radio->core);
 721
 722         freq = clamp(freq,
 723                      si476x_bands[band].rangelow,
 724                      si476x_bands[band].rangehigh);
 725
 726         if (si476x_radio_freq_is_inside_of_the_band(freq,
 727                                                     SI476X_BAND_AM) &&
 728             (!si476x_core_has_am(radio->core) ||
 729              si476x_core_is_a_secondary_tuner(radio->core))) {
 730                 err = -EINVAL;
 731                 goto unlock;
 732         }
 733
 734         err = si476x_radio_change_func(radio, func);
 735         if (err < 0)
 736                 goto unlock;
 737
 738         args.zifsr              = false;
 739         args.hd                 = false;
 740         args.injside            = SI476X_INJSIDE_AUTO;
 741         args.freq               = v4l2_to_si476x(radio->core, freq);
 742         args.tunemode           = SI476X_TM_VALIDATED_NORMAL_TUNE;
 743         args.smoothmetrics      = SI476X_SM_INITIALIZE_AUDIO;
 744         args.antcap             = 0;
 745
 746         err = radio->ops->tune_freq(radio->core, &args);
 747
 748 unlock:
 749         si476x_core_unlock(radio->core);
 750         return err;
 751 }
 752
 753 static int si476x_radio_s_hw_freq_seek(struct file *file, void *priv,
 754                                        const struct v4l2_hw_freq_seek *seek)
 755 {
 756         int err;
 757         enum si476x_func func;
 758         u32 rangelow, rangehigh;
 759         struct si476x_radio *radio = video_drvdata(file);
 760
 761         if (file->f_flags & O_NONBLOCK)
 762                 return -EAGAIN;
 763
 764         if (seek->tuner != 0 ||
 765             seek->type  != V4L2_TUNER_RADIO)
 766                 return -EINVAL;
 767
 768         si476x_core_lock(radio->core);
 769
 770         if (!seek->rangelow) {
 771                 err = regmap_read(radio->core->regmap,
 772                                   SI476X_PROP_SEEK_BAND_BOTTOM,
 773                                   &rangelow);
 774                 if (!err)
 775                         rangelow = si476x_to_v4l2(radio->core, rangelow);
 776                 else
 777                         goto unlock;
 778         }
 779         if (!seek->rangehigh) {
 780                 err = regmap_read(radio->core->regmap,
 781                                   SI476X_PROP_SEEK_BAND_TOP,
 782                                   &rangehigh);
 783                 if (!err)
 784                         rangehigh = si476x_to_v4l2(radio->core, rangehigh);
 785                 else
 786                         goto unlock;
 787         }
 788
 789         if (rangelow > rangehigh) {
 790                 err = -EINVAL;
 791                 goto unlock;
 792         }
 793
 794         if (si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
 795                                                      SI476X_BAND_FM)) {
 796                 func = SI476X_FUNC_FM_RECEIVER;
 797
 798         } else if (si476x_core_has_am(radio->core) &&
 799                    si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
 800                                                             SI476X_BAND_AM)) {
 801                 func = SI476X_FUNC_AM_RECEIVER;
 802         } else {
 803                 err = -EINVAL;
 804                 goto unlock;
 805         }
 806
 807         err = si476x_radio_change_func(radio, func);
 808         if (err < 0)
 809                 goto unlock;
 810
 811         if (seek->rangehigh) {
 812                 err = regmap_write(radio->core->regmap,
 813                                    SI476X_PROP_SEEK_BAND_TOP,
 814                                    v4l2_to_si476x(radio->core,
 815                                                   seek->rangehigh));
 816                 if (err)
 817                         goto unlock;
 818         }
 819         if (seek->rangelow) {
 820                 err = regmap_write(radio->core->regmap,
 821                                    SI476X_PROP_SEEK_BAND_BOTTOM,
 822                                    v4l2_to_si476x(radio->core,
 823                                                   seek->rangelow));
 824                 if (err)
 825                         goto unlock;
 826         }
 827         if (seek->spacing) {
 828                 err = regmap_write(radio->core->regmap,
 829                                      SI476X_PROP_SEEK_FREQUENCY_SPACING,
 830                                      v4l2_to_si476x(radio->core,
 831                                                     seek->spacing));
 832                 if (err)
 833                         goto unlock;
 834         }
 835
 836         err = radio->ops->seek_start(radio->core,
 837                                      seek->seek_upward,
 838                                      seek->wrap_around);
 839 unlock:
 840         si476x_core_unlock(radio->core);
 841
 842
 843
 844         return err;
 845 }
 846
 847 static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 848 {
 849         int retval;
 850         struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
 851
 852         si476x_core_lock(radio->core);
 853
 854         switch (ctrl->id) {
 855         case V4L2_CID_SI476X_INTERCHIP_LINK:
 856                 if (si476x_core_has_diversity(radio->core)) {
 857                         if (radio->ops->phase_diversity) {
 858                                 retval = radio->ops->phase_div_status(radio->core);
 859                                 if (retval < 0)
 860                                         break;
 861
 862                                 ctrl->val = !!SI476X_PHDIV_STATUS_LINK_LOCKED(retval);
 863                                 retval = 0;
 864                                 break;
 865                         } else {
 866                                 retval = -ENOTTY;
 867                                 break;
 868                         }
 869                 }
 870                 retval = -EINVAL;
 871                 break;
 872         default:
 873                 retval = -EINVAL;
 874                 break;
 875         }
 876         si476x_core_unlock(radio->core);
 877         return retval;
 878
 879 }
 880
 881 static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl)
 882 {
 883         int retval;
 884         enum si476x_phase_diversity_mode mode;
 885         struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
 886
 887         si476x_core_lock(radio->core);
 888
 889         switch (ctrl->id) {
 890         case V4L2_CID_SI476X_HARMONICS_COUNT:
 891                 retval = regmap_update_bits(radio->core->regmap,
 892                                             SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 893                                             SI476X_PROP_PWR_HARMONICS_MASK,
 894                                             ctrl->val);
 895                 break;
 896         case V4L2_CID_POWER_LINE_FREQUENCY:
 897                 switch (ctrl->val) {
 898                 case V4L2_CID_POWER_LINE_FREQUENCY_DISABLED:
 899                         retval = regmap_update_bits(radio->core->regmap,
 900                                                     SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 901                                                     SI476X_PROP_PWR_ENABLE_MASK,
 902                                                     0);
 903                         break;
 904                 case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
 905                         retval = regmap_update_bits(radio->core->regmap,
 906                                                     SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 907                                                     SI476X_PROP_PWR_GRID_MASK,
 908                                                     SI476X_PROP_PWR_GRID_50HZ);
 909                         break;
 910                 case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
 911                         retval = regmap_update_bits(radio->core->regmap,
 912                                                     SI476X_PROP_AUDIO_PWR_LINE_FILTER,
 913                                                     SI476X_PROP_PWR_GRID_MASK,
 914                                                     SI476X_PROP_PWR_GRID_60HZ);
 915                         break;
 916                 default:
 917                         retval = -EINVAL;
 918                         break;
 919                 }
 920                 break;
 921         case V4L2_CID_SI476X_RSSI_THRESHOLD:
 922                 retval = regmap_write(radio->core->regmap,
 923                                       SI476X_PROP_VALID_RSSI_THRESHOLD,
 924                                       ctrl->val);
 925                 break;
 926         case V4L2_CID_SI476X_SNR_THRESHOLD:
 927                 retval = regmap_write(radio->core->regmap,
 928                                       SI476X_PROP_VALID_SNR_THRESHOLD,
 929                                       ctrl->val);
 930                 break;
 931         case V4L2_CID_SI476X_MAX_TUNE_ERROR:
 932                 retval = regmap_write(radio->core->regmap,
 933                                       SI476X_PROP_VALID_MAX_TUNE_ERROR,
 934                                       ctrl->val);
 935                 break;
 936         case V4L2_CID_RDS_RECEPTION:
 937                 /*
 938                  * It looks like RDS related properties are
 939                  * inaccesable when tuner is in AM mode, so cache the
 940                  * changes
 941                  */
 942                 if (si476x_core_is_in_am_receiver_mode(radio->core))
 943                         regcache_cache_only(radio->core->regmap, true);
 944
 945                 if (ctrl->val) {
 946                         retval = regmap_write(radio->core->regmap,
 947                                               SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT,
 948                                               radio->core->rds_fifo_depth);
 949                         if (retval < 0)
 950                                 break;
 951
 952                         if (radio->core->client->irq) {
 953                                 retval = regmap_write(radio->core->regmap,
 954                                                       SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
 955                                                       SI476X_RDSRECV);
 956                                 if (retval < 0)
 957                                         break;
 958                         }
 959
 960                         /* Drain RDS FIFO before enabling RDS processing */
 961                         retval = si476x_core_cmd_fm_rds_status(radio->core,
 962                                                                false,
 963                                                                true,
 964                                                                true,
 965                                                                NULL);
 966                         if (retval < 0)
 967                                 break;
 968
 969                         retval = regmap_update_bits(radio->core->regmap,
 970                                                     SI476X_PROP_FM_RDS_CONFIG,
 971                                                     SI476X_PROP_RDSEN_MASK,
 972                                                     SI476X_PROP_RDSEN);
 973                 } else {
 974                         retval = regmap_update_bits(radio->core->regmap,
 975                                                     SI476X_PROP_FM_RDS_CONFIG,
 976                                                     SI476X_PROP_RDSEN_MASK,
 977                                                     !SI476X_PROP_RDSEN);
 978                 }
 979
 980                 if (si476x_core_is_in_am_receiver_mode(radio->core))
 981                         regcache_cache_only(radio->core->regmap, false);
 982                 break;
 983         case V4L2_CID_TUNE_DEEMPHASIS:
 984                 retval = regmap_write(radio->core->regmap,
 985                                       SI476X_PROP_AUDIO_DEEMPHASIS,
 986                                       ctrl->val);
 987                 break;
 988
 989         case V4L2_CID_SI476X_DIVERSITY_MODE:
 990                 mode = si476x_phase_diversity_idx_to_mode(ctrl->val);
 991
 992                 if (mode == radio->core->diversity_mode) {
 993                         retval = 0;
 994                         break;
 995                 }
 996
 997                 if (si476x_core_is_in_am_receiver_mode(radio->core)) {
 998                         /*
 999                          * Diversity cannot be configured while tuner
1000                          * is in AM mode so save the changes and carry on.
1001                          */
1002                         radio->core->diversity_mode = mode;
1003                         retval = 0;
1004                 } else {
1005                         retval = radio->ops->phase_diversity(radio->core, mode);
1006                         if (!retval)
1007                                 radio->core->diversity_mode = mode;
1008                 }
1009                 break;
1010
1011         default:
1012                 retval = -EINVAL;
1013                 break;
1014         }
1015
1016         si476x_core_unlock(radio->core);
1017
1018         return retval;
1019 }
1020
1021 #ifdef CONFIG_VIDEO_ADV_DEBUG
1022 static int si476x_radio_g_register(struct file *file, void *fh,
1023                                    struct v4l2_dbg_register *reg)
1024 {
1025         int err;
1026         unsigned int value;
1027         struct si476x_radio *radio = video_drvdata(file);
1028
1029         si476x_core_lock(radio->core);
1030         reg->size = 2;
1031         err = regmap_read(radio->core->regmap,
1032                           (unsigned int)reg->reg, &value);
1033         reg->val = value;
1034         si476x_core_unlock(radio->core);
1035
1036         return err;
1037 }
1038 static int si476x_radio_s_register(struct file *file, void *fh,
1039                                    const struct v4l2_dbg_register *reg)
1040 {
1041
1042         int err;
1043         struct si476x_radio *radio = video_drvdata(file);
1044
1045         si476x_core_lock(radio->core);
1046         err = regmap_write(radio->core->regmap,
1047                            (unsigned int)reg->reg,
1048                            (unsigned int)reg->val);
1049         si476x_core_unlock(radio->core);
1050
1051         return err;
1052 }
1053 #endif
1054
1055 static int si476x_radio_fops_open(struct file *file)
1056 {
1057         struct si476x_radio *radio = video_drvdata(file);
1058         int err;
1059
1060         err = v4l2_fh_open(file);
1061         if (err)
1062                 return err;
1063
1064         if (v4l2_fh_is_singular_file(file)) {
1065                 si476x_core_lock(radio->core);
1066                 err = si476x_core_set_power_state(radio->core,
1067                                                   SI476X_POWER_UP_FULL);
1068                 if (err < 0)
1069                         goto done;
1070
1071                 err = si476x_radio_do_post_powerup_init(radio,
1072                                                         radio->core->power_up_parameters.func);
1073                 if (err < 0)
1074                         goto power_down;
1075
1076                 err = si476x_radio_pretune(radio,
1077                                            radio->core->power_up_parameters.func);
1078                 if (err < 0)
1079                         goto power_down;
1080
1081                 si476x_core_unlock(radio->core);
1082                 /*Must be done after si476x_core_unlock to prevent a deadlock*/
1083                 v4l2_ctrl_handler_setup(&radio->ctrl_handler);
1084         }
1085
1086         return err;
1087
1088 power_down:
1089         si476x_core_set_power_state(radio->core,
1090                                     SI476X_POWER_DOWN);
1091 done:
1092         si476x_core_unlock(radio->core);
1093         v4l2_fh_release(file);
1094
1095         return err;
1096 }
1097
1098 static int si476x_radio_fops_release(struct file *file)
1099 {
1100         int err;
1101         struct si476x_radio *radio = video_drvdata(file);
1102
1103         if (v4l2_fh_is_singular_file(file) &&
1104             atomic_read(&radio->core->is_alive))
1105                 si476x_core_set_power_state(radio->core,
1106                                             SI476X_POWER_DOWN);
1107
1108         err = v4l2_fh_release(file);
1109
1110         return err;
1111 }
1112
1113 static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
1114                                       size_t count, loff_t *ppos)
1115 {
1116         ssize_t      rval;
1117         size_t       fifo_len;
1118         unsigned int copied;
1119
1120         struct si476x_radio *radio = video_drvdata(file);
1121
1122         /* block if no new data available */
1123         if (kfifo_is_empty(&radio->core->rds_fifo)) {
1124                 if (file->f_flags & O_NONBLOCK)
1125                         return -EWOULDBLOCK;
1126
1127                 rval = wait_event_interruptible(radio->core->rds_read_queue,
1128                                                 (!kfifo_is_empty(&radio->core->rds_fifo) ||
1129                                                  !atomic_read(&radio->core->is_alive)));
1130                 if (rval < 0)
1131                         return -EINTR;
1132
1133                 if (!atomic_read(&radio->core->is_alive))
1134                         return -ENODEV;
1135         }
1136
1137         fifo_len = kfifo_len(&radio->core->rds_fifo);
1138
1139         if (kfifo_to_user(&radio->core->rds_fifo, buf,
1140                           min(fifo_len, count),
1141                           &copied) != 0) {
1142                 dev_warn(&radio->videodev.dev,
1143                          "Error during FIFO to userspace copy\n");
1144                 rval = -EIO;
1145         } else {
1146                 rval = (ssize_t)copied;
1147         }
1148
1149         return rval;
1150 }
1151
1152 static unsigned int si476x_radio_fops_poll(struct file *file,
1153                                 struct poll_table_struct *pts)
1154 {
1155         struct si476x_radio *radio = video_drvdata(file);
1156         unsigned long req_events = poll_requested_events(pts);
1157         unsigned int err = v4l2_ctrl_poll(file, pts);
1158
1159         if (req_events & (POLLIN | POLLRDNORM)) {
1160                 if (atomic_read(&radio->core->is_alive))
1161                         poll_wait(file, &radio->core->rds_read_queue, pts);
1162
1163                 if (!atomic_read(&radio->core->is_alive))
1164                         err = POLLHUP;
1165
1166                 if (!kfifo_is_empty(&radio->core->rds_fifo))
1167                         err = POLLIN | POLLRDNORM;
1168         }
1169
1170         return err;
1171 }
1172
1173 static const struct v4l2_file_operations si476x_fops = {
1174         .owner                  = THIS_MODULE,
1175         .read                   = si476x_radio_fops_read,
1176         .poll                   = si476x_radio_fops_poll,
1177         .unlocked_ioctl         = video_ioctl2,
1178         .open                   = si476x_radio_fops_open,
1179         .release                = si476x_radio_fops_release,
1180 };
1181
1182
1183 static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
1184         .vidioc_querycap                = si476x_radio_querycap,
1185         .vidioc_g_tuner                 = si476x_radio_g_tuner,
1186         .vidioc_s_tuner                 = si476x_radio_s_tuner,
1187
1188         .vidioc_g_frequency             = si476x_radio_g_frequency,
1189         .vidioc_s_frequency             = si476x_radio_s_frequency,
1190         .vidioc_s_hw_freq_seek          = si476x_radio_s_hw_freq_seek,
1191         .vidioc_enum_freq_bands         = si476x_radio_enum_freq_bands,
1192
1193         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
1194         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
1195
1196 #ifdef CONFIG_VIDEO_ADV_DEBUG
1197         .vidioc_g_register              = si476x_radio_g_register,
1198         .vidioc_s_register              = si476x_radio_s_register,
1199 #endif
1200 };
1201
1202
1203 static const struct video_device si476x_viddev_template = {
1204         .fops                   = &si476x_fops,
1205         .name                   = DRIVER_NAME,
1206         .release                = video_device_release_empty,
1207 };
1208
1209
1210
1211 static ssize_t si476x_radio_read_acf_blob(struct file *file,
1212                                           char __user *user_buf,
1213                                           size_t count, loff_t *ppos)
1214 {
1215         int err;
1216         struct si476x_radio *radio = file->private_data;
1217         struct si476x_acf_status_report report;
1218
1219         si476x_core_lock(radio->core);
1220         if (radio->ops->acf_status)
1221                 err = radio->ops->acf_status(radio->core, &report);
1222         else
1223                 err = -ENOENT;
1224         si476x_core_unlock(radio->core);
1225
1226         if (err < 0)
1227                 return err;
1228
1229         return simple_read_from_buffer(user_buf, count, ppos, &report,
1230                                        sizeof(report));
1231 }
1232
1233 static const struct file_operations radio_acf_fops = {
1234         .open   = simple_open,
1235         .llseek = default_llseek,
1236         .read   = si476x_radio_read_acf_blob,
1237 };
1238
1239 static ssize_t si476x_radio_read_rds_blckcnt_blob(struct file *file,
1240                                                   char __user *user_buf,
1241                                                   size_t count, loff_t *ppos)
1242 {
1243         int err;
1244         struct si476x_radio *radio = file->private_data;
1245         struct si476x_rds_blockcount_report report;
1246
1247         si476x_core_lock(radio->core);
1248         if (radio->ops->rds_blckcnt)
1249                 err = radio->ops->rds_blckcnt(radio->core, true,
1250                                                &report);
1251         else
1252                 err = -ENOENT;
1253         si476x_core_unlock(radio->core);
1254
1255         if (err < 0)
1256                 return err;
1257
1258         return simple_read_from_buffer(user_buf, count, ppos, &report,
1259                                        sizeof(report));
1260 }
1261
1262 static const struct file_operations radio_rds_blckcnt_fops = {
1263         .open   = simple_open,
1264         .llseek = default_llseek,
1265         .read   = si476x_radio_read_rds_blckcnt_blob,
1266 };
1267
1268 static ssize_t si476x_radio_read_agc_blob(struct file *file,
1269                                           char __user *user_buf,
1270                                           size_t count, loff_t *ppos)
1271 {
1272         int err;
1273         struct si476x_radio *radio = file->private_data;
1274         struct si476x_agc_status_report report;
1275
1276         si476x_core_lock(radio->core);
1277         if (radio->ops->rds_blckcnt)
1278                 err = radio->ops->agc_status(radio->core, &report);
1279         else
1280                 err = -ENOENT;
1281         si476x_core_unlock(radio->core);
1282
1283         if (err < 0)
1284                 return err;
1285
1286         return simple_read_from_buffer(user_buf, count, ppos, &report,
1287                                        sizeof(report));
1288 }
1289
1290 static const struct file_operations radio_agc_fops = {
1291         .open   = simple_open,
1292         .llseek = default_llseek,
1293         .read   = si476x_radio_read_agc_blob,
1294 };
1295
1296 static ssize_t si476x_radio_read_rsq_blob(struct file *file,
1297                                           char __user *user_buf,
1298                                           size_t count, loff_t *ppos)
1299 {
1300         int err;
1301         struct si476x_radio *radio = file->private_data;
1302         struct si476x_rsq_status_report report;
1303         struct si476x_rsq_status_args args = {
1304                 .primary        = false,
1305                 .rsqack         = false,
1306                 .attune         = false,
1307                 .cancel         = false,
1308                 .stcack         = false,
1309         };
1310
1311         si476x_core_lock(radio->core);
1312         if (radio->ops->rds_blckcnt)
1313                 err = radio->ops->rsq_status(radio->core, &args, &report);
1314         else
1315                 err = -ENOENT;
1316         si476x_core_unlock(radio->core);
1317
1318         if (err < 0)
1319                 return err;
1320
1321         return simple_read_from_buffer(user_buf, count, ppos, &report,
1322                                        sizeof(report));
1323 }
1324
1325 static const struct file_operations radio_rsq_fops = {
1326         .open   = simple_open,
1327         .llseek = default_llseek,
1328         .read   = si476x_radio_read_rsq_blob,
1329 };
1330
1331 static ssize_t si476x_radio_read_rsq_primary_blob(struct file *file,
1332                                                   char __user *user_buf,
1333                                                   size_t count, loff_t *ppos)
1334 {
1335         int err;
1336         struct si476x_radio *radio = file->private_data;
1337         struct si476x_rsq_status_report report;
1338         struct si476x_rsq_status_args args = {
1339                 .primary        = true,
1340                 .rsqack         = false,
1341                 .attune         = false,
1342                 .cancel         = false,
1343                 .stcack         = false,
1344         };
1345
1346         si476x_core_lock(radio->core);
1347         if (radio->ops->rds_blckcnt)
1348                 err = radio->ops->rsq_status(radio->core, &args, &report);
1349         else
1350                 err = -ENOENT;
1351         si476x_core_unlock(radio->core);
1352
1353         if (err < 0)
1354                 return err;
1355
1356         return simple_read_from_buffer(user_buf, count, ppos, &report,
1357                                        sizeof(report));
1358 }
1359
1360 static const struct file_operations radio_rsq_primary_fops = {
1361         .open   = simple_open,
1362         .llseek = default_llseek,
1363         .read   = si476x_radio_read_rsq_primary_blob,
1364 };
1365
1366
1367 static int si476x_radio_init_debugfs(struct si476x_radio *radio)
1368 {
1369         struct dentry   *dentry;
1370         int             ret;
1371
1372         dentry = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
1373         if (IS_ERR(dentry)) {
1374                 ret = PTR_ERR(dentry);
1375                 goto exit;
1376         }
1377         radio->debugfs = dentry;
1378
1379         dentry = debugfs_create_file("acf", S_IRUGO,
1380                                      radio->debugfs, radio, &radio_acf_fops);
1381         if (IS_ERR(dentry)) {
1382                 ret = PTR_ERR(dentry);
1383                 goto cleanup;
1384         }
1385
1386         dentry = debugfs_create_file("rds_blckcnt", S_IRUGO,
1387                                      radio->debugfs, radio,
1388                                      &radio_rds_blckcnt_fops);
1389         if (IS_ERR(dentry)) {
1390                 ret = PTR_ERR(dentry);
1391                 goto cleanup;
1392         }
1393
1394         dentry = debugfs_create_file("agc", S_IRUGO,
1395                                      radio->debugfs, radio, &radio_agc_fops);
1396         if (IS_ERR(dentry)) {
1397                 ret = PTR_ERR(dentry);
1398                 goto cleanup;
1399         }
1400
1401         dentry = debugfs_create_file("rsq", S_IRUGO,
1402                                      radio->debugfs, radio, &radio_rsq_fops);
1403         if (IS_ERR(dentry)) {
1404                 ret = PTR_ERR(dentry);
1405                 goto cleanup;
1406         }
1407
1408         dentry = debugfs_create_file("rsq_primary", S_IRUGO,
1409                                      radio->debugfs, radio,
1410                                      &radio_rsq_primary_fops);
1411         if (IS_ERR(dentry)) {
1412                 ret = PTR_ERR(dentry);
1413                 goto cleanup;
1414         }
1415
1416         return 0;
1417 cleanup:
1418         debugfs_remove_recursive(radio->debugfs);
1419 exit:
1420         return ret;
1421 }
1422
1423
1424 static int si476x_radio_add_new_custom(struct si476x_radio *radio,
1425                                        enum si476x_ctrl_idx idx)
1426 {
1427         int rval;
1428         struct v4l2_ctrl *ctrl;
1429
1430         ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
1431                                     &si476x_ctrls[idx],
1432                                     NULL);
1433         rval = radio->ctrl_handler.error;
1434         if (ctrl == NULL && rval)
1435                 dev_err(radio->v4l2dev.dev,
1436                         "Could not initialize '%s' control %d\n",
1437                         si476x_ctrls[idx].name, rval);
1438
1439         return rval;
1440 }
1441
1442 static int si476x_radio_probe(struct platform_device *pdev)
1443 {
1444         int rval;
1445         struct si476x_radio *radio;
1446         struct v4l2_ctrl *ctrl;
1447
1448         static atomic_t instance = ATOMIC_INIT(0);
1449
1450         radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
1451         if (!radio)
1452                 return -ENOMEM;
1453
1454         radio->core = i2c_mfd_cell_to_core(&pdev->dev);
1455
1456         v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
1457
1458         rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
1459         if (rval) {
1460                 dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
1461                 return rval;
1462         }
1463
1464         memcpy(&radio->videodev, &si476x_viddev_template,
1465                sizeof(struct video_device));
1466
1467         radio->videodev.v4l2_dev  = &radio->v4l2dev;
1468         radio->videodev.ioctl_ops = &si4761_ioctl_ops;
1469
1470         video_set_drvdata(&radio->videodev, radio);
1471         platform_set_drvdata(pdev, radio);
1472
1473         set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
1474
1475         radio->v4l2dev.ctrl_handler = &radio->ctrl_handler;
1476         v4l2_ctrl_handler_init(&radio->ctrl_handler,
1477                                1 + ARRAY_SIZE(si476x_ctrls));
1478
1479         if (si476x_core_has_am(radio->core)) {
1480                 ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1481                                               &si476x_ctrl_ops,
1482                                               V4L2_CID_POWER_LINE_FREQUENCY,
1483                                               V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
1484                                               0, 0);
1485                 rval = radio->ctrl_handler.error;
1486                 if (ctrl == NULL && rval) {
1487                         dev_err(&pdev->dev, "Could not initialize V4L2_CID_POWER_LINE_FREQUENCY control %d\n",
1488                                 rval);
1489                         goto exit;
1490                 }
1491
1492                 rval = si476x_radio_add_new_custom(radio,
1493                                                    SI476X_IDX_HARMONICS_COUNT);
1494                 if (rval < 0)
1495                         goto exit;
1496         }
1497
1498         rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RSSI_THRESHOLD);
1499         if (rval < 0)
1500                 goto exit;
1501
1502         rval = si476x_radio_add_new_custom(radio, SI476X_IDX_SNR_THRESHOLD);
1503         if (rval < 0)
1504                 goto exit;
1505
1506         rval = si476x_radio_add_new_custom(radio, SI476X_IDX_MAX_TUNE_ERROR);
1507         if (rval < 0)
1508                 goto exit;
1509
1510         ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
1511                                       &si476x_ctrl_ops,
1512                                       V4L2_CID_TUNE_DEEMPHASIS,
1513                                       V4L2_DEEMPHASIS_75_uS, 0, 0);
1514         rval = radio->ctrl_handler.error;
1515         if (ctrl == NULL && rval) {
1516                 dev_err(&pdev->dev, "Could not initialize V4L2_CID_TUNE_DEEMPHASIS control %d\n",
1517                         rval);
1518                 goto exit;
1519         }
1520
1521         ctrl = v4l2_ctrl_new_std(&radio->ctrl_handler, &si476x_ctrl_ops,
1522                                  V4L2_CID_RDS_RECEPTION,
1523                                  0, 1, 1, 1);
1524         rval = radio->ctrl_handler.error;
1525         if (ctrl == NULL && rval) {
1526                 dev_err(&pdev->dev, "Could not initialize V4L2_CID_RDS_RECEPTION control %d\n",
1527                         rval);
1528                 goto exit;
1529         }
1530
1531         if (si476x_core_has_diversity(radio->core)) {
1532                 si476x_ctrls[SI476X_IDX_DIVERSITY_MODE].def =
1533                         si476x_phase_diversity_mode_to_idx(radio->core->diversity_mode);
1534                 si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
1535                 if (rval < 0)
1536                         goto exit;
1537
1538                 si476x_radio_add_new_custom(radio, SI476X_IDX_INTERCHIP_LINK);
1539                 if (rval < 0)
1540                         goto exit;
1541         }
1542
1543         /* register video device */
1544         rval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, -1);
1545         if (rval < 0) {
1546                 dev_err(&pdev->dev, "Could not register video device\n");
1547                 goto exit;
1548         }
1549
1550         rval = si476x_radio_init_debugfs(radio);
1551         if (rval < 0) {
1552                 dev_err(&pdev->dev, "Could not creat debugfs interface\n");
1553                 goto exit;
1554         }
1555
1556         return 0;
1557 exit:
1558         v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1559         return rval;
1560 }
1561
1562 static int si476x_radio_remove(struct platform_device *pdev)
1563 {
1564         struct si476x_radio *radio = platform_get_drvdata(pdev);
1565
1566         v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
1567         video_unregister_device(&radio->videodev);
1568         v4l2_device_unregister(&radio->v4l2dev);
1569         debugfs_remove_recursive(radio->debugfs);
1570
1571         return 0;
1572 }
1573
1574 MODULE_ALIAS("platform:si476x-radio");
1575
1576 static struct platform_driver si476x_radio_driver = {
1577         .driver         = {
1578                 .name   = DRIVER_NAME,
1579                 .owner  = THIS_MODULE,
1580         },
1581         .probe          = si476x_radio_probe,
1582         .remove         = si476x_radio_remove,
1583 };
1584 module_platform_driver(si476x_radio_driver);
1585
1586 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
1587 MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
1588 MODULE_LICENSE("GPL");