drivers/mfd/si476x-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
   4  * device
   5  *
   6  * Copyright (C) 2012 Innovative Converged Devices(ICD)
   7  * Copyright (C) 2013 Andrey Smirnov
   8  *
   9  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
  10  */
  11 #include <linux/module.h>
  12
  13 #include <linux/slab.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/delay.h>
  16 #include <linux/gpio.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/i2c.h>
  19 #include <linux/err.h>
  20
  21 #include <linux/mfd/si476x-core.h>
  22
  23 #define SI476X_MAX_IO_ERRORS            10
  24 #define SI476X_DRIVER_RDS_FIFO_DEPTH    128
  25
  26 /**
  27  * si476x_core_config_pinmux() - pin function configuration function
  28  *
  29  * @core: Core device structure
  30  *
  31  * Configure the functions of the pins of the radio chip.
  32  *
  33  * The function returns zero in case of succes or negative error code
  34  * otherwise.
  35  */
  36 static int si476x_core_config_pinmux(struct si476x_core *core)
  37 {
  38         int err;
  39         dev_dbg(&core->client->dev, "Configuring pinmux\n");
  40         err = si476x_core_cmd_dig_audio_pin_cfg(core,
  41                                                 core->pinmux.dclk,
  42                                                 core->pinmux.dfs,
  43                                                 core->pinmux.dout,
  44                                                 core->pinmux.xout);
  45         if (err < 0) {
  46                 dev_err(&core->client->dev,
  47                         "Failed to configure digital audio pins(err = %d)\n",
  48                         err);
  49                 return err;
  50         }
  51
  52         err = si476x_core_cmd_zif_pin_cfg(core,
  53                                           core->pinmux.iqclk,
  54                                           core->pinmux.iqfs,
  55                                           core->pinmux.iout,
  56                                           core->pinmux.qout);
  57         if (err < 0) {
  58                 dev_err(&core->client->dev,
  59                         "Failed to configure ZIF pins(err = %d)\n",
  60                         err);
  61                 return err;
  62         }
  63
  64         err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
  65                                                       core->pinmux.icin,
  66                                                       core->pinmux.icip,
  67                                                       core->pinmux.icon,
  68                                                       core->pinmux.icop);
  69         if (err < 0) {
  70                 dev_err(&core->client->dev,
  71                         "Failed to configure IC-Link/GPO pins(err = %d)\n",
  72                         err);
  73                 return err;
  74         }
  75
  76         err = si476x_core_cmd_ana_audio_pin_cfg(core,
  77                                                 core->pinmux.lrout);
  78         if (err < 0) {
  79                 dev_err(&core->client->dev,
  80                         "Failed to configure analog audio pins(err = %d)\n",
  81                         err);
  82                 return err;
  83         }
  84
  85         err = si476x_core_cmd_intb_pin_cfg(core,
  86                                            core->pinmux.intb,
  87                                            core->pinmux.a1);
  88         if (err < 0) {
  89                 dev_err(&core->client->dev,
  90                         "Failed to configure interrupt pins(err = %d)\n",
  91                         err);
  92                 return err;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
  99 {
 100         schedule_delayed_work(&core->status_monitor,
 101                               usecs_to_jiffies(SI476X_STATUS_POLL_US));
 102 }
 103
 104 /**
 105  * si476x_core_start() - early chip startup function
 106  * @core: Core device structure
 107  * @soft: When set, this flag forces "soft" startup, where "soft"
 108  * power down is the one done by sending appropriate command instead
 109  * of using reset pin of the tuner
 110  *
 111  * Perform required startup sequence to correctly power
 112  * up the chip and perform initial configuration. It does the
 113  * following sequence of actions:
 114  *       1. Claims and enables the power supplies VD and VIO1 required
 115  *          for I2C interface of the chip operation.
 116  *       2. Waits for 100us, pulls the reset line up, enables irq,
 117  *          waits for another 100us as it is specified by the
 118  *          datasheet.
 119  *       3. Sends 'POWER_UP' command to the device with all provided
 120  *          information about power-up parameters.
 121  *       4. Configures, pin multiplexor, disables digital audio and
 122  *          configures interrupt sources.
 123  *
 124  * The function returns zero in case of succes or negative error code
 125  * otherwise.
 126  */
 127 int si476x_core_start(struct si476x_core *core, bool soft)
 128 {
 129         struct i2c_client *client = core->client;
 130         int err;
 131
 132         if (!soft) {
 133                 if (gpio_is_valid(core->gpio_reset))
 134                         gpio_set_value_cansleep(core->gpio_reset, 1);
 135
 136                 if (client->irq)
 137                         enable_irq(client->irq);
 138
 139                 udelay(100);
 140
 141                 if (!client->irq) {
 142                         atomic_set(&core->is_alive, 1);
 143                         si476x_core_schedule_polling_work(core);
 144                 }
 145         } else {
 146                 if (client->irq)
 147                         enable_irq(client->irq);
 148                 else {
 149                         atomic_set(&core->is_alive, 1);
 150                         si476x_core_schedule_polling_work(core);
 151                 }
 152         }
 153
 154         err = si476x_core_cmd_power_up(core,
 155                                        &core->power_up_parameters);
 156
 157         if (err < 0) {
 158                 dev_err(&core->client->dev,
 159                         "Power up failure(err = %d)\n",
 160                         err);
 161                 goto disable_irq;
 162         }
 163
 164         if (client->irq)
 165                 atomic_set(&core->is_alive, 1);
 166
 167         err = si476x_core_config_pinmux(core);
 168         if (err < 0) {
 169                 dev_err(&core->client->dev,
 170                         "Failed to configure pinmux(err = %d)\n",
 171                         err);
 172                 goto disable_irq;
 173         }
 174
 175         if (client->irq) {
 176                 err = regmap_write(core->regmap,
 177                                    SI476X_PROP_INT_CTL_ENABLE,
 178                                    SI476X_RDSIEN |
 179                                    SI476X_STCIEN |
 180                                    SI476X_CTSIEN);
 181                 if (err < 0) {
 182                         dev_err(&core->client->dev,
 183                                 "Failed to configure interrupt sources"
 184                                 "(err = %d)\n", err);
 185                         goto disable_irq;
 186                 }
 187         }
 188
 189         return 0;
 190
 191 disable_irq:
 192         if (err == -ENODEV)
 193                 atomic_set(&core->is_alive, 0);
 194
 195         if (client->irq)
 196                 disable_irq(client->irq);
 197         else
 198                 cancel_delayed_work_sync(&core->status_monitor);
 199
 200         if (gpio_is_valid(core->gpio_reset))
 201                 gpio_set_value_cansleep(core->gpio_reset, 0);
 202
 203         return err;
 204 }
 205 EXPORT_SYMBOL_GPL(si476x_core_start);
 206
 207 /**
 208  * si476x_core_stop() - chip power-down function
 209  * @core: Core device structure
 210  * @soft: When set, function sends a POWER_DOWN command instead of
 211  * bringing reset line low
 212  *
 213  * Power down the chip by performing following actions:
 214  * 1. Disable IRQ or stop the polling worker
 215  * 2. Send the POWER_DOWN command if the power down is soft or bring
 216  *    reset line low if not.
 217  *
 218  * The function returns zero in case of succes or negative error code
 219  * otherwise.
 220  */
 221 int si476x_core_stop(struct si476x_core *core, bool soft)
 222 {
 223         int err = 0;
 224         atomic_set(&core->is_alive, 0);
 225
 226         if (soft) {
 227                 /* TODO: This probably shoud be a configurable option,
 228                  * so it is possible to have the chips keep their
 229                  * oscillators running
 230                  */
 231                 struct si476x_power_down_args args = {
 232                         .xosc = false,
 233                 };
 234                 err = si476x_core_cmd_power_down(core, &args);
 235         }
 236
 237         /* We couldn't disable those before
 238          * 'si476x_core_cmd_power_down' since we expect to get CTS
 239          * interrupt */
 240         if (core->client->irq)
 241                 disable_irq(core->client->irq);
 242         else
 243                 cancel_delayed_work_sync(&core->status_monitor);
 244
 245         if (!soft) {
 246                 if (gpio_is_valid(core->gpio_reset))
 247                         gpio_set_value_cansleep(core->gpio_reset, 0);
 248         }
 249         return err;
 250 }
 251 EXPORT_SYMBOL_GPL(si476x_core_stop);
 252
 253 /**
 254  * si476x_core_set_power_state() - set the level at which the power is
 255  * supplied for the chip.
 256  * @core: Core device structure
 257  * @next_state: enum si476x_power_state describing power state to
 258  *              switch to.
 259  *
 260  * Switch on all the required power supplies
 261  *
 262  * This function returns 0 in case of suvccess and negative error code
 263  * otherwise.
 264  */
 265 int si476x_core_set_power_state(struct si476x_core *core,
 266                                 enum si476x_power_state next_state)
 267 {
 268         /*
 269            It is not clear form the datasheet if it is possible to
 270            work with device if not all power domains are operational.
 271            So for now the power-up policy is "power-up all the things!"
 272          */
 273         int err = 0;
 274
 275         if (core->power_state == SI476X_POWER_INCONSISTENT) {
 276                 dev_err(&core->client->dev,
 277                         "The device in inconsistent power state\n");
 278                 return -EINVAL;
 279         }
 280
 281         if (next_state != core->power_state) {
 282                 switch (next_state) {
 283                 case SI476X_POWER_UP_FULL:
 284                         err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
 285                                                     core->supplies);
 286                         if (err < 0) {
 287                                 core->power_state = SI476X_POWER_INCONSISTENT;
 288                                 break;
 289                         }
 290                         /*
 291                          * Startup timing diagram recommends to have a
 292                          * 100 us delay between enabling of the power
 293                          * supplies and turning the tuner on.
 294                          */
 295                         udelay(100);
 296
 297                         err = si476x_core_start(core, false);
 298                         if (err < 0)
 299                                 goto disable_regulators;
 300
 301                         core->power_state = next_state;
 302                         break;
 303
 304                 case SI476X_POWER_DOWN:
 305                         core->power_state = next_state;
 306                         err = si476x_core_stop(core, false);
 307                         if (err < 0)
 308                                 core->power_state = SI476X_POWER_INCONSISTENT;
 309 disable_regulators:
 310                         err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
 311                                                      core->supplies);
 312                         if (err < 0)
 313                                 core->power_state = SI476X_POWER_INCONSISTENT;
 314                         break;
 315                 default:
 316                         BUG();
 317                 }
 318         }
 319
 320         return err;
 321 }
 322 EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
 323
 324 /**
 325  * si476x_core_report_drainer_stop() - mark the completion of the RDS
 326  * buffer drain porcess by the worker.
 327  *
 328  * @core: Core device structure
 329  */
 330 static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
 331 {
 332         mutex_lock(&core->rds_drainer_status_lock);
 333         core->rds_drainer_is_working = false;
 334         mutex_unlock(&core->rds_drainer_status_lock);
 335 }
 336
 337 /**
 338  * si476x_core_start_rds_drainer_once() - start RDS drainer worker if
 339  * ther is none working, do nothing otherwise
 340  *
 341  * @core: Datastructure corresponding to the chip.
 342  */
 343 static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
 344 {
 345         mutex_lock(&core->rds_drainer_status_lock);
 346         if (!core->rds_drainer_is_working) {
 347                 core->rds_drainer_is_working = true;
 348                 schedule_work(&core->rds_fifo_drainer);
 349         }
 350         mutex_unlock(&core->rds_drainer_status_lock);
 351 }
 352 /**
 353  * si476x_core_drain_rds_fifo() - RDS buffer drainer.
 354  * @work: struct work_struct being ppassed to the function by the
 355  * kernel.
 356  *
 357  * Drain the contents of the RDS FIFO of
 358  */
 359 static void si476x_core_drain_rds_fifo(struct work_struct *work)
 360 {
 361         int err;
 362
 363         struct si476x_core *core = container_of(work, struct si476x_core,
 364                                                 rds_fifo_drainer);
 365
 366         struct si476x_rds_status_report report;
 367
 368         si476x_core_lock(core);
 369         err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
 370         if (!err) {
 371                 int i = report.rdsfifoused;
 372                 dev_dbg(&core->client->dev,
 373                         "%d elements in RDS FIFO. Draining.\n", i);
 374                 for (; i > 0; --i) {
 375                         err = si476x_core_cmd_fm_rds_status(core, false, false,
 376                                                             (i == 1), &report);
 377                         if (err < 0)
 378                                 goto unlock;
 379
 380                         kfifo_in(&core->rds_fifo, report.rds,
 381                                  sizeof(report.rds));
 382                         dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
 383                                 (int)sizeof(report.rds), report.rds);
 384                 }
 385                 dev_dbg(&core->client->dev, "Drrrrained!\n");
 386                 wake_up_interruptible(&core->rds_read_queue);
 387         }
 388
 389 unlock:
 390         si476x_core_unlock(core);
 391         si476x_core_report_drainer_stop(core);
 392 }
 393
 394 /**
 395  * si476x_core_pronounce_dead()
 396  *
 397  * @core: Core device structure
 398  *
 399  * Mark the device as being dead and wake up all potentially waiting
 400  * threads of execution.
 401  *
 402  */
 403 static void si476x_core_pronounce_dead(struct si476x_core *core)
 404 {
 405         dev_info(&core->client->dev, "Core device is dead.\n");
 406
 407         atomic_set(&core->is_alive, 0);
 408
 409         /* Wake up al possible waiting processes */
 410         wake_up_interruptible(&core->rds_read_queue);
 411
 412         atomic_set(&core->cts, 1);
 413         wake_up(&core->command);
 414
 415         atomic_set(&core->stc, 1);
 416         wake_up(&core->tuning);
 417 }
 418
 419 /**
 420  * si476x_core_i2c_xfer()
 421  *
 422  * @core: Core device structure
 423  * @type: Transfer type
 424  * @buf: Transfer buffer for/with data
 425  * @count: Transfer buffer size
 426  *
 427  * Perfrom and I2C transfer(either read or write) and keep a counter
 428  * of I/O errors. If the error counter rises above the threshold
 429  * pronounce device dead.
 430  *
 431  * The function returns zero on succes or negative error code on
 432  * failure.
 433  */
 434 int si476x_core_i2c_xfer(struct si476x_core *core,
 435                     enum si476x_i2c_type type,
 436                     char *buf, int count)
 437 {
 438         static int io_errors_count;
 439         int err;
 440         if (type == SI476X_I2C_SEND)
 441                 err = i2c_master_send(core->client, buf, count);
 442         else
 443                 err = i2c_master_recv(core->client, buf, count);
 444
 445         if (err < 0) {
 446                 if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
 447                         si476x_core_pronounce_dead(core);
 448         } else {
 449                 io_errors_count = 0;
 450         }
 451
 452         return err;
 453 }
 454 EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
 455
 456 /**
 457  * si476x_core_get_status()
 458  * @core: Core device structure
 459  *
 460  * Get the status byte of the core device by berforming one byte I2C
 461  * read.
 462  *
 463  * The function returns a status value or a negative error code on
 464  * error.
 465  */
 466 static int si476x_core_get_status(struct si476x_core *core)
 467 {
 468         u8 response;
 469         int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
 470                                   &response, sizeof(response));
 471
 472         return (err < 0) ? err : response;
 473 }
 474
 475 /**
 476  * si476x_core_get_and_signal_status() - IRQ dispatcher
 477  * @core: Core device structure
 478  *
 479  * Dispatch the arrived interrupt request based on the value of the
 480  * status byte reported by the tuner.
 481  *
 482  */
 483 static void si476x_core_get_and_signal_status(struct si476x_core *core)
 484 {
 485         int status = si476x_core_get_status(core);
 486         if (status < 0) {
 487                 dev_err(&core->client->dev, "Failed to get status\n");
 488                 return;
 489         }
 490
 491         if (status & SI476X_CTS) {
 492                 /* Unfortunately completions could not be used for
 493                  * signalling CTS since this flag cannot be cleared
 494                  * in status byte, and therefore once it becomes true
 495                  * multiple calls to 'complete' would cause the
 496                  * commands following the current one to be completed
 497                  * before they actually are */
 498                 dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
 499                 atomic_set(&core->cts, 1);
 500                 wake_up(&core->command);
 501         }
 502
 503         if (status & SI476X_FM_RDS_INT) {
 504                 dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
 505                 si476x_core_start_rds_drainer_once(core);
 506         }
 507
 508         if (status & SI476X_STC_INT) {
 509                 dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
 510                 atomic_set(&core->stc, 1);
 511                 wake_up(&core->tuning);
 512         }
 513 }
 514
 515 static void si476x_core_poll_loop(struct work_struct *work)
 516 {
 517         struct si476x_core *core = SI476X_WORK_TO_CORE(work);
 518
 519         si476x_core_get_and_signal_status(core);
 520
 521         if (atomic_read(&core->is_alive))
 522                 si476x_core_schedule_polling_work(core);
 523 }
 524
 525 static irqreturn_t si476x_core_interrupt(int irq, void *dev)
 526 {
 527         struct si476x_core *core = dev;
 528
 529         si476x_core_get_and_signal_status(core);
 530
 531         return IRQ_HANDLED;
 532 }
 533
 534 /**
 535  * si476x_core_fwver_to_revision()
 536  * @core: Core device structure
 537  * @func: Selects the boot function of the device:
 538  *         *_BOOTLOADER  - Boot loader
 539  *         *_FM_RECEIVER - FM receiver
 540  *         *_AM_RECEIVER - AM receiver
 541  *         *_WB_RECEIVER - Weatherband receiver
 542  * @major:  Firmware major number
 543  * @minor1: Firmware first minor number
 544  * @minor2: Firmware second minor number
 545  *
 546  * Convert a chip's firmware version number into an offset that later
 547  * will be used to as offset in "vtable" of tuner functions
 548  *
 549  * This function returns a positive offset in case of success and a -1
 550  * in case of failure.
 551  */
 552 static int si476x_core_fwver_to_revision(struct si476x_core *core,
 553                                          int func, int major,
 554                                          int minor1, int minor2)
 555 {
 556         switch (func) {
 557         case SI476X_FUNC_FM_RECEIVER:
 558                 switch (major) {
 559                 case 5:
 560                         return SI476X_REVISION_A10;
 561                 case 8:
 562                         return SI476X_REVISION_A20;
 563                 case 10:
 564                         return SI476X_REVISION_A30;
 565                 default:
 566                         goto unknown_revision;
 567                 }
 568         case SI476X_FUNC_AM_RECEIVER:
 569                 switch (major) {
 570                 case 5:
 571                         return SI476X_REVISION_A10;
 572                 case 7:
 573                         return SI476X_REVISION_A20;
 574                 case 9:
 575                         return SI476X_REVISION_A30;
 576                 default:
 577                         goto unknown_revision;
 578                 }
 579         case SI476X_FUNC_WB_RECEIVER:
 580                 switch (major) {
 581                 case 3:
 582                         return SI476X_REVISION_A10;
 583                 case 5:
 584                         return SI476X_REVISION_A20;
 585                 case 7:
 586                         return SI476X_REVISION_A30;
 587                 default:
 588                         goto unknown_revision;
 589                 }
 590         case SI476X_FUNC_BOOTLOADER:
 591         default:                /* FALLTHROUGH */
 592                 BUG();
 593                 return -1;
 594         }
 595
 596 unknown_revision:
 597         dev_err(&core->client->dev,
 598                 "Unsupported version of the firmware: %d.%d.%d, "
 599                 "reverting to A10 compatible functions\n",
 600                 major, minor1, minor2);
 601
 602         return SI476X_REVISION_A10;
 603 }
 604
 605 /**
 606  * si476x_core_get_revision_info()
 607  * @core: Core device structure
 608  *
 609  * Get the firmware version number of the device. It is done in
 610  * following three steps:
 611  *    1. Power-up the device
 612  *    2. Send the 'FUNC_INFO' command
 613  *    3. Powering the device down.
 614  *
 615  * The function return zero on success and a negative error code on
 616  * failure.
 617  */
 618 static int si476x_core_get_revision_info(struct si476x_core *core)
 619 {
 620         int rval;
 621         struct si476x_func_info info;
 622
 623         si476x_core_lock(core);
 624         rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
 625         if (rval < 0)
 626                 goto exit;
 627
 628         rval = si476x_core_cmd_func_info(core, &info);
 629         if (rval < 0)
 630                 goto power_down;
 631
 632         core->revision = si476x_core_fwver_to_revision(core, info.func,
 633                                                        info.firmware.major,
 634                                                        info.firmware.minor[0],
 635                                                        info.firmware.minor[1]);
 636 power_down:
 637         si476x_core_set_power_state(core, SI476X_POWER_DOWN);
 638 exit:
 639         si476x_core_unlock(core);
 640
 641         return rval;
 642 }
 643
 644 bool si476x_core_has_am(struct si476x_core *core)
 645 {
 646         return core->chip_id == SI476X_CHIP_SI4761 ||
 647                 core->chip_id == SI476X_CHIP_SI4764;
 648 }
 649 EXPORT_SYMBOL_GPL(si476x_core_has_am);
 650
 651 bool si476x_core_has_diversity(struct si476x_core *core)
 652 {
 653         return core->chip_id == SI476X_CHIP_SI4764;
 654 }
 655 EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
 656
 657 bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
 658 {
 659         return si476x_core_has_diversity(core) &&
 660                 (core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
 661                  core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
 662 }
 663 EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
 664
 665 bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
 666 {
 667         return si476x_core_has_diversity(core) &&
 668                 (core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
 669                  core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
 670 }
 671 EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
 672
 673 bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
 674 {
 675         return si476x_core_has_am(core) &&
 676                 (core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
 677 }
 678 EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
 679
 680 bool si476x_core_is_powered_up(struct si476x_core *core)
 681 {
 682         return core->power_state == SI476X_POWER_UP_FULL;
 683 }
 684 EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
 685
 686 static int si476x_core_probe(struct i2c_client *client,
 687                              const struct i2c_device_id *id)
 688 {
 689         int rval;
 690         struct si476x_core          *core;
 691         struct si476x_platform_data *pdata;
 692         struct mfd_cell *cell;
 693         int              cell_num;
 694
 695         core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
 696         if (!core)
 697                 return -ENOMEM;
 698
 699         core->client = client;
 700
 701         core->regmap = devm_regmap_init_si476x(core);
 702         if (IS_ERR(core->regmap)) {
 703                 rval = PTR_ERR(core->regmap);
 704                 dev_err(&client->dev,
 705                         "Failed to allocate register map: %d\n",
 706                         rval);
 707                 return rval;
 708         }
 709
 710         i2c_set_clientdata(client, core);
 711
 712         atomic_set(&core->is_alive, 0);
 713         core->power_state = SI476X_POWER_DOWN;
 714
 715         pdata = dev_get_platdata(&client->dev);
 716         if (pdata) {
 717                 memcpy(&core->power_up_parameters,
 718                        &pdata->power_up_parameters,
 719                        sizeof(core->power_up_parameters));
 720
 721                 core->gpio_reset = -1;
 722                 if (gpio_is_valid(pdata->gpio_reset)) {
 723                         rval = gpio_request(pdata->gpio_reset, "si476x reset");
 724                         if (rval) {
 725                                 dev_err(&client->dev,
 726                                         "Failed to request gpio: %d\n", rval);
 727                                 return rval;
 728                         }
 729                         core->gpio_reset = pdata->gpio_reset;
 730                         gpio_direction_output(core->gpio_reset, 0);
 731                 }
 732
 733                 core->diversity_mode = pdata->diversity_mode;
 734                 memcpy(&core->pinmux, &pdata->pinmux,
 735                        sizeof(struct si476x_pinmux));
 736         } else {
 737                 dev_err(&client->dev, "No platform data provided\n");
 738                 return -EINVAL;
 739         }
 740
 741         core->supplies[0].supply = "vd";
 742         core->supplies[1].supply = "va";
 743         core->supplies[2].supply = "vio1";
 744         core->supplies[3].supply = "vio2";
 745
 746         rval = devm_regulator_bulk_get(&client->dev,
 747                                        ARRAY_SIZE(core->supplies),
 748                                        core->supplies);
 749         if (rval) {
 750                 dev_err(&client->dev, "Failed to get all of the regulators\n");
 751                 goto free_gpio;
 752         }
 753
 754         mutex_init(&core->cmd_lock);
 755         init_waitqueue_head(&core->command);
 756         init_waitqueue_head(&core->tuning);
 757
 758         rval = kfifo_alloc(&core->rds_fifo,
 759                            SI476X_DRIVER_RDS_FIFO_DEPTH *
 760                            sizeof(struct v4l2_rds_data),
 761                            GFP_KERNEL);
 762         if (rval) {
 763                 dev_err(&client->dev, "Could not allocate the FIFO\n");
 764                 goto free_gpio;
 765         }
 766         mutex_init(&core->rds_drainer_status_lock);
 767         init_waitqueue_head(&core->rds_read_queue);
 768         INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
 769
 770         if (client->irq) {
 771                 rval = devm_request_threaded_irq(&client->dev,
 772                                                  client->irq, NULL,
 773                                                  si476x_core_interrupt,
 774                                                  IRQF_TRIGGER_FALLING |
 775                                                  IRQF_ONESHOT,
 776                                                  client->name, core);
 777                 if (rval < 0) {
 778                         dev_err(&client->dev, "Could not request IRQ %d\n",
 779                                 client->irq);
 780                         goto free_kfifo;
 781                 }
 782                 disable_irq(client->irq);
 783                 dev_dbg(&client->dev, "IRQ requested.\n");
 784
 785                 core->rds_fifo_depth = 20;
 786         } else {
 787                 INIT_DELAYED_WORK(&core->status_monitor,
 788                                   si476x_core_poll_loop);
 789                 dev_info(&client->dev,
 790                          "No IRQ number specified, will use polling\n");
 791
 792                 core->rds_fifo_depth = 5;
 793         }
 794
 795         core->chip_id = id->driver_data;
 796
 797         rval = si476x_core_get_revision_info(core);
 798         if (rval < 0) {
 799                 rval = -ENODEV;
 800                 goto free_kfifo;
 801         }
 802
 803         cell_num = 0;
 804
 805         cell = &core->cells[SI476X_RADIO_CELL];
 806         cell->name = "si476x-radio";
 807         cell_num++;
 808
 809 #ifdef CONFIG_SND_SOC_SI476X
 810         if ((core->chip_id == SI476X_CHIP_SI4761 ||
 811              core->chip_id == SI476X_CHIP_SI4764)       &&
 812             core->pinmux.dclk == SI476X_DCLK_DAUDIO     &&
 813             core->pinmux.dfs  == SI476X_DFS_DAUDIO      &&
 814             core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
 815             core->pinmux.xout == SI476X_XOUT_TRISTATE) {
 816                 cell = &core->cells[SI476X_CODEC_CELL];
 817                 cell->name          = "si476x-codec";
 818                 cell_num++;
 819         }
 820 #endif
 821         rval = mfd_add_devices(&client->dev,
 822                                (client->adapter->nr << 8) + client->addr,
 823                                core->cells, cell_num,
 824                                NULL, 0, NULL);
 825         if (!rval)
 826                 return 0;
 827
 828 free_kfifo:
 829         kfifo_free(&core->rds_fifo);
 830
 831 free_gpio:
 832         if (gpio_is_valid(core->gpio_reset))
 833                 gpio_free(core->gpio_reset);
 834
 835         return rval;
 836 }
 837
 838 static void si476x_core_remove(struct i2c_client *client)
 839 {
 840         struct si476x_core *core = i2c_get_clientdata(client);
 841
 842         si476x_core_pronounce_dead(core);
 843         mfd_remove_devices(&client->dev);
 844
 845         if (client->irq)
 846                 disable_irq(client->irq);
 847         else
 848                 cancel_delayed_work_sync(&core->status_monitor);
 849
 850         kfifo_free(&core->rds_fifo);
 851
 852         if (gpio_is_valid(core->gpio_reset))
 853                 gpio_free(core->gpio_reset);
 854 }
 855
 856
 857 static const struct i2c_device_id si476x_id[] = {
 858         { "si4761", SI476X_CHIP_SI4761 },
 859         { "si4764", SI476X_CHIP_SI4764 },
 860         { "si4768", SI476X_CHIP_SI4768 },
 861         { },
 862 };
 863 MODULE_DEVICE_TABLE(i2c, si476x_id);
 864
 865 static struct i2c_driver si476x_core_driver = {
 866         .driver         = {
 867                 .name   = "si476x-core",
 868         },
 869         .probe          = si476x_core_probe,
 870         .remove         = si476x_core_remove,
 871         .id_table       = si476x_id,
 872 };
 873 module_i2c_driver(si476x_core_driver);
 874
 875
 876 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 877 MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
 878 MODULE_LICENSE("GPL");