drivers/mfd/si476x-i2c.c

   1 /*
   2  * drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
   3  * device
   4  *
   5  * Copyright (C) 2012 Innovative Converged Devices(ICD)
   6  * Copyright (C) 2013 Andrey Smirnov
   7  *
   8  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; version 2 of the License.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  */
  20 #include <linux/module.h>
  21
  22 #include <linux/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/delay.h>
  25 #include <linux/gpio.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <linux/i2c.h>
  28 #include <linux/err.h>
  29
  30 #include <linux/mfd/si476x-core.h>
  31
  32 #define SI476X_MAX_IO_ERRORS            10
  33 #define SI476X_DRIVER_RDS_FIFO_DEPTH    128
  34
  35 /**
  36  * si476x_core_config_pinmux() - pin function configuration function
  37  *
  38  * @core: Core device structure
  39  *
  40  * Configure the functions of the pins of the radio chip.
  41  *
  42  * The function returns zero in case of succes or negative error code
  43  * otherwise.
  44  */
  45 static int si476x_core_config_pinmux(struct si476x_core *core)
  46 {
  47         int err;
  48         dev_dbg(&core->client->dev, "Configuring pinmux\n");
  49         err = si476x_core_cmd_dig_audio_pin_cfg(core,
  50                                                 core->pinmux.dclk,
  51                                                 core->pinmux.dfs,
  52                                                 core->pinmux.dout,
  53                                                 core->pinmux.xout);
  54         if (err < 0) {
  55                 dev_err(&core->client->dev,
  56                         "Failed to configure digital audio pins(err = %d)\n",
  57                         err);
  58                 return err;
  59         }
  60
  61         err = si476x_core_cmd_zif_pin_cfg(core,
  62                                           core->pinmux.iqclk,
  63                                           core->pinmux.iqfs,
  64                                           core->pinmux.iout,
  65                                           core->pinmux.qout);
  66         if (err < 0) {
  67                 dev_err(&core->client->dev,
  68                         "Failed to configure ZIF pins(err = %d)\n",
  69                         err);
  70                 return err;
  71         }
  72
  73         err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
  74                                                       core->pinmux.icin,
  75                                                       core->pinmux.icip,
  76                                                       core->pinmux.icon,
  77                                                       core->pinmux.icop);
  78         if (err < 0) {
  79                 dev_err(&core->client->dev,
  80                         "Failed to configure IC-Link/GPO pins(err = %d)\n",
  81                         err);
  82                 return err;
  83         }
  84
  85         err = si476x_core_cmd_ana_audio_pin_cfg(core,
  86                                                 core->pinmux.lrout);
  87         if (err < 0) {
  88                 dev_err(&core->client->dev,
  89                         "Failed to configure analog audio pins(err = %d)\n",
  90                         err);
  91                 return err;
  92         }
  93
  94         err = si476x_core_cmd_intb_pin_cfg(core,
  95                                            core->pinmux.intb,
  96                                            core->pinmux.a1);
  97         if (err < 0) {
  98                 dev_err(&core->client->dev,
  99                         "Failed to configure interrupt pins(err = %d)\n",
 100                         err);
 101                 return err;
 102         }
 103
 104         return 0;
 105 }
 106
 107 static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
 108 {
 109         schedule_delayed_work(&core->status_monitor,
 110                               usecs_to_jiffies(SI476X_STATUS_POLL_US));
 111 }
 112
 113 /**
 114  * si476x_core_start() - early chip startup function
 115  * @core: Core device structure
 116  * @soft: When set, this flag forces "soft" startup, where "soft"
 117  * power down is the one done by sending appropriate command instead
 118  * of using reset pin of the tuner
 119  *
 120  * Perform required startup sequence to correctly power
 121  * up the chip and perform initial configuration. It does the
 122  * following sequence of actions:
 123  *       1. Claims and enables the power supplies VD and VIO1 required
 124  *          for I2C interface of the chip operation.
 125  *       2. Waits for 100us, pulls the reset line up, enables irq,
 126  *          waits for another 100us as it is specified by the
 127  *          datasheet.
 128  *       3. Sends 'POWER_UP' command to the device with all provided
 129  *          information about power-up parameters.
 130  *       4. Configures, pin multiplexor, disables digital audio and
 131  *          configures interrupt sources.
 132  *
 133  * The function returns zero in case of succes or negative error code
 134  * otherwise.
 135  */
 136 int si476x_core_start(struct si476x_core *core, bool soft)
 137 {
 138         struct i2c_client *client = core->client;
 139         int err;
 140
 141         if (!soft) {
 142                 if (gpio_is_valid(core->gpio_reset))
 143                         gpio_set_value_cansleep(core->gpio_reset, 1);
 144
 145                 if (client->irq)
 146                         enable_irq(client->irq);
 147
 148                 udelay(100);
 149
 150                 if (!client->irq) {
 151                         atomic_set(&core->is_alive, 1);
 152                         si476x_core_schedule_polling_work(core);
 153                 }
 154         } else {
 155                 if (client->irq)
 156                         enable_irq(client->irq);
 157                 else {
 158                         atomic_set(&core->is_alive, 1);
 159                         si476x_core_schedule_polling_work(core);
 160                 }
 161         }
 162
 163         err = si476x_core_cmd_power_up(core,
 164                                        &core->power_up_parameters);
 165
 166         if (err < 0) {
 167                 dev_err(&core->client->dev,
 168                         "Power up failure(err = %d)\n",
 169                         err);
 170                 goto disable_irq;
 171         }
 172
 173         if (client->irq)
 174                 atomic_set(&core->is_alive, 1);
 175
 176         err = si476x_core_config_pinmux(core);
 177         if (err < 0) {
 178                 dev_err(&core->client->dev,
 179                         "Failed to configure pinmux(err = %d)\n",
 180                         err);
 181                 goto disable_irq;
 182         }
 183
 184         if (client->irq) {
 185                 err = regmap_write(core->regmap,
 186                                    SI476X_PROP_INT_CTL_ENABLE,
 187                                    SI476X_RDSIEN |
 188                                    SI476X_STCIEN |
 189                                    SI476X_CTSIEN);
 190                 if (err < 0) {
 191                         dev_err(&core->client->dev,
 192                                 "Failed to configure interrupt sources"
 193                                 "(err = %d)\n", err);
 194                         goto disable_irq;
 195                 }
 196         }
 197
 198         return 0;
 199
 200 disable_irq:
 201         if (err == -ENODEV)
 202                 atomic_set(&core->is_alive, 0);
 203
 204         if (client->irq)
 205                 disable_irq(client->irq);
 206         else
 207                 cancel_delayed_work_sync(&core->status_monitor);
 208
 209         if (gpio_is_valid(core->gpio_reset))
 210                 gpio_set_value_cansleep(core->gpio_reset, 0);
 211
 212         return err;
 213 }
 214 EXPORT_SYMBOL_GPL(si476x_core_start);
 215
 216 /**
 217  * si476x_core_stop() - chip power-down function
 218  * @core: Core device structure
 219  * @soft: When set, function sends a POWER_DOWN command instead of
 220  * bringing reset line low
 221  *
 222  * Power down the chip by performing following actions:
 223  * 1. Disable IRQ or stop the polling worker
 224  * 2. Send the POWER_DOWN command if the power down is soft or bring
 225  *    reset line low if not.
 226  *
 227  * The function returns zero in case of succes or negative error code
 228  * otherwise.
 229  */
 230 int si476x_core_stop(struct si476x_core *core, bool soft)
 231 {
 232         int err = 0;
 233         atomic_set(&core->is_alive, 0);
 234
 235         if (soft) {
 236                 /* TODO: This probably shoud be a configurable option,
 237                  * so it is possible to have the chips keep their
 238                  * oscillators running
 239                  */
 240                 struct si476x_power_down_args args = {
 241                         .xosc = false,
 242                 };
 243                 err = si476x_core_cmd_power_down(core, &args);
 244         }
 245
 246         /* We couldn't disable those before
 247          * 'si476x_core_cmd_power_down' since we expect to get CTS
 248          * interrupt */
 249         if (core->client->irq)
 250                 disable_irq(core->client->irq);
 251         else
 252                 cancel_delayed_work_sync(&core->status_monitor);
 253
 254         if (!soft) {
 255                 if (gpio_is_valid(core->gpio_reset))
 256                         gpio_set_value_cansleep(core->gpio_reset, 0);
 257         }
 258         return err;
 259 }
 260 EXPORT_SYMBOL_GPL(si476x_core_stop);
 261
 262 /**
 263  * si476x_core_set_power_state() - set the level at which the power is
 264  * supplied for the chip.
 265  * @core: Core device structure
 266  * @next_state: enum si476x_power_state describing power state to
 267  *              switch to.
 268  *
 269  * Switch on all the required power supplies
 270  *
 271  * This function returns 0 in case of suvccess and negative error code
 272  * otherwise.
 273  */
 274 int si476x_core_set_power_state(struct si476x_core *core,
 275                                 enum si476x_power_state next_state)
 276 {
 277         /*
 278            It is not clear form the datasheet if it is possible to
 279            work with device if not all power domains are operational.
 280            So for now the power-up policy is "power-up all the things!"
 281          */
 282         int err = 0;
 283
 284         if (core->power_state == SI476X_POWER_INCONSISTENT) {
 285                 dev_err(&core->client->dev,
 286                         "The device in inconsistent power state\n");
 287                 return -EINVAL;
 288         }
 289
 290         if (next_state != core->power_state) {
 291                 switch (next_state) {
 292                 case SI476X_POWER_UP_FULL:
 293                         err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
 294                                                     core->supplies);
 295                         if (err < 0) {
 296                                 core->power_state = SI476X_POWER_INCONSISTENT;
 297                                 break;
 298                         }
 299                         /*
 300                          * Startup timing diagram recommends to have a
 301                          * 100 us delay between enabling of the power
 302                          * supplies and turning the tuner on.
 303                          */
 304                         udelay(100);
 305
 306                         err = si476x_core_start(core, false);
 307                         if (err < 0)
 308                                 goto disable_regulators;
 309
 310                         core->power_state = next_state;
 311                         break;
 312
 313                 case SI476X_POWER_DOWN:
 314                         core->power_state = next_state;
 315                         err = si476x_core_stop(core, false);
 316                         if (err < 0)
 317                                 core->power_state = SI476X_POWER_INCONSISTENT;
 318 disable_regulators:
 319                         err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
 320                                                      core->supplies);
 321                         if (err < 0)
 322                                 core->power_state = SI476X_POWER_INCONSISTENT;
 323                         break;
 324                 default:
 325                         BUG();
 326                 }
 327         }
 328
 329         return err;
 330 }
 331 EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
 332
 333 /**
 334  * si476x_core_report_drainer_stop() - mark the completion of the RDS
 335  * buffer drain porcess by the worker.
 336  *
 337  * @core: Core device structure
 338  */
 339 static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
 340 {
 341         mutex_lock(&core->rds_drainer_status_lock);
 342         core->rds_drainer_is_working = false;
 343         mutex_unlock(&core->rds_drainer_status_lock);
 344 }
 345
 346 /**
 347  * si476x_core_start_rds_drainer_once() - start RDS drainer worker if
 348  * ther is none working, do nothing otherwise
 349  *
 350  * @core: Datastructure corresponding to the chip.
 351  */
 352 static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
 353 {
 354         mutex_lock(&core->rds_drainer_status_lock);
 355         if (!core->rds_drainer_is_working) {
 356                 core->rds_drainer_is_working = true;
 357                 schedule_work(&core->rds_fifo_drainer);
 358         }
 359         mutex_unlock(&core->rds_drainer_status_lock);
 360 }
 361 /**
 362  * si476x_drain_rds_fifo() - RDS buffer drainer.
 363  * @work: struct work_struct being ppassed to the function by the
 364  * kernel.
 365  *
 366  * Drain the contents of the RDS FIFO of
 367  */
 368 static void si476x_core_drain_rds_fifo(struct work_struct *work)
 369 {
 370         int err;
 371
 372         struct si476x_core *core = container_of(work, struct si476x_core,
 373                                                 rds_fifo_drainer);
 374
 375         struct si476x_rds_status_report report;
 376
 377         si476x_core_lock(core);
 378         err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
 379         if (!err) {
 380                 int i = report.rdsfifoused;
 381                 dev_dbg(&core->client->dev,
 382                         "%d elements in RDS FIFO. Draining.\n", i);
 383                 for (; i > 0; --i) {
 384                         err = si476x_core_cmd_fm_rds_status(core, false, false,
 385                                                             (i == 1), &report);
 386                         if (err < 0)
 387                                 goto unlock;
 388
 389                         kfifo_in(&core->rds_fifo, report.rds,
 390                                  sizeof(report.rds));
 391                         dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
 392                                 (int)sizeof(report.rds), report.rds);
 393                 }
 394                 dev_dbg(&core->client->dev, "Drrrrained!\n");
 395                 wake_up_interruptible(&core->rds_read_queue);
 396         }
 397
 398 unlock:
 399         si476x_core_unlock(core);
 400         si476x_core_report_drainer_stop(core);
 401 }
 402
 403 /**
 404  * si476x_core_pronounce_dead()
 405  *
 406  * @core: Core device structure
 407  *
 408  * Mark the device as being dead and wake up all potentially waiting
 409  * threads of execution.
 410  *
 411  */
 412 static void si476x_core_pronounce_dead(struct si476x_core *core)
 413 {
 414         dev_info(&core->client->dev, "Core device is dead.\n");
 415
 416         atomic_set(&core->is_alive, 0);
 417
 418         /* Wake up al possible waiting processes */
 419         wake_up_interruptible(&core->rds_read_queue);
 420
 421         atomic_set(&core->cts, 1);
 422         wake_up(&core->command);
 423
 424         atomic_set(&core->stc, 1);
 425         wake_up(&core->tuning);
 426 }
 427
 428 /**
 429  * si476x_core_i2c_xfer()
 430  *
 431  * @core: Core device structure
 432  * @type: Transfer type
 433  * @buf: Transfer buffer for/with data
 434  * @count: Transfer buffer size
 435  *
 436  * Perfrom and I2C transfer(either read or write) and keep a counter
 437  * of I/O errors. If the error counter rises above the threshold
 438  * pronounce device dead.
 439  *
 440  * The function returns zero on succes or negative error code on
 441  * failure.
 442  */
 443 int si476x_core_i2c_xfer(struct si476x_core *core,
 444                     enum si476x_i2c_type type,
 445                     char *buf, int count)
 446 {
 447         static int io_errors_count;
 448         int err;
 449         if (type == SI476X_I2C_SEND)
 450                 err = i2c_master_send(core->client, buf, count);
 451         else
 452                 err = i2c_master_recv(core->client, buf, count);
 453
 454         if (err < 0) {
 455                 if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
 456                         si476x_core_pronounce_dead(core);
 457         } else {
 458                 io_errors_count = 0;
 459         }
 460
 461         return err;
 462 }
 463 EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
 464
 465 /**
 466  * si476x_get_status()
 467  * @core: Core device structure
 468  *
 469  * Get the status byte of the core device by berforming one byte I2C
 470  * read.
 471  *
 472  * The function returns a status value or a negative error code on
 473  * error.
 474  */
 475 static int si476x_core_get_status(struct si476x_core *core)
 476 {
 477         u8 response;
 478         int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
 479                                   &response, sizeof(response));
 480
 481         return (err < 0) ? err : response;
 482 }
 483
 484 /**
 485  * si476x_get_and_signal_status() - IRQ dispatcher
 486  * @core: Core device structure
 487  *
 488  * Dispatch the arrived interrupt request based on the value of the
 489  * status byte reported by the tuner.
 490  *
 491  */
 492 static void si476x_core_get_and_signal_status(struct si476x_core *core)
 493 {
 494         int status = si476x_core_get_status(core);
 495         if (status < 0) {
 496                 dev_err(&core->client->dev, "Failed to get status\n");
 497                 return;
 498         }
 499
 500         if (status & SI476X_CTS) {
 501                 /* Unfortunately completions could not be used for
 502                  * signalling CTS since this flag cannot be cleared
 503                  * in status byte, and therefore once it becomes true
 504                  * multiple calls to 'complete' would cause the
 505                  * commands following the current one to be completed
 506                  * before they actually are */
 507                 dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
 508                 atomic_set(&core->cts, 1);
 509                 wake_up(&core->command);
 510         }
 511
 512         if (status & SI476X_FM_RDS_INT) {
 513                 dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
 514                 si476x_core_start_rds_drainer_once(core);
 515         }
 516
 517         if (status & SI476X_STC_INT) {
 518                 dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
 519                 atomic_set(&core->stc, 1);
 520                 wake_up(&core->tuning);
 521         }
 522 }
 523
 524 static void si476x_core_poll_loop(struct work_struct *work)
 525 {
 526         struct si476x_core *core = SI476X_WORK_TO_CORE(work);
 527
 528         si476x_core_get_and_signal_status(core);
 529
 530         if (atomic_read(&core->is_alive))
 531                 si476x_core_schedule_polling_work(core);
 532 }
 533
 534 static irqreturn_t si476x_core_interrupt(int irq, void *dev)
 535 {
 536         struct si476x_core *core = dev;
 537
 538         si476x_core_get_and_signal_status(core);
 539
 540         return IRQ_HANDLED;
 541 }
 542
 543 /**
 544  * si476x_firmware_version_to_revision()
 545  * @core: Core device structure
 546  * @major:  Firmware major number
 547  * @minor1: Firmware first minor number
 548  * @minor2: Firmware second minor number
 549  *
 550  * Convert a chip's firmware version number into an offset that later
 551  * will be used to as offset in "vtable" of tuner functions
 552  *
 553  * This function returns a positive offset in case of success and a -1
 554  * in case of failure.
 555  */
 556 static int si476x_core_fwver_to_revision(struct si476x_core *core,
 557                                          int func, int major,
 558                                          int minor1, int minor2)
 559 {
 560         switch (func) {
 561         case SI476X_FUNC_FM_RECEIVER:
 562                 switch (major) {
 563                 case 5:
 564                         return SI476X_REVISION_A10;
 565                 case 8:
 566                         return SI476X_REVISION_A20;
 567                 case 10:
 568                         return SI476X_REVISION_A30;
 569                 default:
 570                         goto unknown_revision;
 571                 }
 572         case SI476X_FUNC_AM_RECEIVER:
 573                 switch (major) {
 574                 case 5:
 575                         return SI476X_REVISION_A10;
 576                 case 7:
 577                         return SI476X_REVISION_A20;
 578                 case 9:
 579                         return SI476X_REVISION_A30;
 580                 default:
 581                         goto unknown_revision;
 582                 }
 583         case SI476X_FUNC_WB_RECEIVER:
 584                 switch (major) {
 585                 case 3:
 586                         return SI476X_REVISION_A10;
 587                 case 5:
 588                         return SI476X_REVISION_A20;
 589                 case 7:
 590                         return SI476X_REVISION_A30;
 591                 default:
 592                         goto unknown_revision;
 593                 }
 594         case SI476X_FUNC_BOOTLOADER:
 595         default:                /* FALLTHROUG */
 596                 BUG();
 597                 return -1;
 598         }
 599
 600 unknown_revision:
 601         dev_err(&core->client->dev,
 602                 "Unsupported version of the firmware: %d.%d.%d, "
 603                 "reverting to A10 compatible functions\n",
 604                 major, minor1, minor2);
 605
 606         return SI476X_REVISION_A10;
 607 }
 608
 609 /**
 610  * si476x_get_revision_info()
 611  * @core: Core device structure
 612  *
 613  * Get the firmware version number of the device. It is done in
 614  * following three steps:
 615  *    1. Power-up the device
 616  *    2. Send the 'FUNC_INFO' command
 617  *    3. Powering the device down.
 618  *
 619  * The function return zero on success and a negative error code on
 620  * failure.
 621  */
 622 static int si476x_core_get_revision_info(struct si476x_core *core)
 623 {
 624         int rval;
 625         struct si476x_func_info info;
 626
 627         si476x_core_lock(core);
 628         rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
 629         if (rval < 0)
 630                 goto exit;
 631
 632         rval = si476x_core_cmd_func_info(core, &info);
 633         if (rval < 0)
 634                 goto power_down;
 635
 636         core->revision = si476x_core_fwver_to_revision(core, info.func,
 637                                                        info.firmware.major,
 638                                                        info.firmware.minor[0],
 639                                                        info.firmware.minor[1]);
 640 power_down:
 641         si476x_core_set_power_state(core, SI476X_POWER_DOWN);
 642 exit:
 643         si476x_core_unlock(core);
 644
 645         return rval;
 646 }
 647
 648 bool si476x_core_has_am(struct si476x_core *core)
 649 {
 650         return core->chip_id == SI476X_CHIP_SI4761 ||
 651                 core->chip_id == SI476X_CHIP_SI4764;
 652 }
 653 EXPORT_SYMBOL_GPL(si476x_core_has_am);
 654
 655 bool si476x_core_has_diversity(struct si476x_core *core)
 656 {
 657         return core->chip_id == SI476X_CHIP_SI4764;
 658 }
 659 EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
 660
 661 bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
 662 {
 663         return si476x_core_has_diversity(core) &&
 664                 (core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
 665                  core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
 666 }
 667 EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
 668
 669 bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
 670 {
 671         return si476x_core_has_diversity(core) &&
 672                 (core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
 673                  core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
 674 }
 675 EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
 676
 677 bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
 678 {
 679         return si476x_core_has_am(core) &&
 680                 (core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
 681 }
 682 EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
 683
 684 bool si476x_core_is_powered_up(struct si476x_core *core)
 685 {
 686         return core->power_state == SI476X_POWER_UP_FULL;
 687 }
 688 EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
 689
 690 static int si476x_core_probe(struct i2c_client *client,
 691                              const struct i2c_device_id *id)
 692 {
 693         int rval;
 694         struct si476x_core          *core;
 695         struct si476x_platform_data *pdata;
 696         struct mfd_cell *cell;
 697         int              cell_num;
 698
 699         core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
 700         if (!core) {
 701                 dev_err(&client->dev,
 702                         "failed to allocate 'struct si476x_core'\n");
 703                 return -ENOMEM;
 704         }
 705         core->client = client;
 706
 707         core->regmap = devm_regmap_init_si476x(core);
 708         if (IS_ERR(core->regmap)) {
 709                 rval = PTR_ERR(core->regmap);
 710                 dev_err(&client->dev,
 711                         "Failed to allocate register map: %d\n",
 712                         rval);
 713                 return rval;
 714         }
 715
 716         i2c_set_clientdata(client, core);
 717
 718         atomic_set(&core->is_alive, 0);
 719         core->power_state = SI476X_POWER_DOWN;
 720
 721         pdata = dev_get_platdata(&client->dev);
 722         if (pdata) {
 723                 memcpy(&core->power_up_parameters,
 724                        &pdata->power_up_parameters,
 725                        sizeof(core->power_up_parameters));
 726
 727                 core->gpio_reset = -1;
 728                 if (gpio_is_valid(pdata->gpio_reset)) {
 729                         rval = gpio_request(pdata->gpio_reset, "si476x reset");
 730                         if (rval) {
 731                                 dev_err(&client->dev,
 732                                         "Failed to request gpio: %d\n", rval);
 733                                 return rval;
 734                         }
 735                         core->gpio_reset = pdata->gpio_reset;
 736                         gpio_direction_output(core->gpio_reset, 0);
 737                 }
 738
 739                 core->diversity_mode = pdata->diversity_mode;
 740                 memcpy(&core->pinmux, &pdata->pinmux,
 741                        sizeof(struct si476x_pinmux));
 742         } else {
 743                 dev_err(&client->dev, "No platform data provided\n");
 744                 return -EINVAL;
 745         }
 746
 747         core->supplies[0].supply = "vd";
 748         core->supplies[1].supply = "va";
 749         core->supplies[2].supply = "vio1";
 750         core->supplies[3].supply = "vio2";
 751
 752         rval = devm_regulator_bulk_get(&client->dev,
 753                                        ARRAY_SIZE(core->supplies),
 754                                        core->supplies);
 755         if (rval) {
 756                 dev_err(&client->dev, "Failed to get all of the regulators\n");
 757                 goto free_gpio;
 758         }
 759
 760         mutex_init(&core->cmd_lock);
 761         init_waitqueue_head(&core->command);
 762         init_waitqueue_head(&core->tuning);
 763
 764         rval = kfifo_alloc(&core->rds_fifo,
 765                            SI476X_DRIVER_RDS_FIFO_DEPTH *
 766                            sizeof(struct v4l2_rds_data),
 767                            GFP_KERNEL);
 768         if (rval) {
 769                 dev_err(&client->dev, "Could not allocate the FIFO\n");
 770                 goto free_gpio;
 771         }
 772         mutex_init(&core->rds_drainer_status_lock);
 773         init_waitqueue_head(&core->rds_read_queue);
 774         INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
 775
 776         if (client->irq) {
 777                 rval = devm_request_threaded_irq(&client->dev,
 778                                                  client->irq, NULL,
 779                                                  si476x_core_interrupt,
 780                                                  IRQF_TRIGGER_FALLING |
 781                                                  IRQF_ONESHOT,
 782                                                  client->name, core);
 783                 if (rval < 0) {
 784                         dev_err(&client->dev, "Could not request IRQ %d\n",
 785                                 client->irq);
 786                         goto free_kfifo;
 787                 }
 788                 disable_irq(client->irq);
 789                 dev_dbg(&client->dev, "IRQ requested.\n");
 790
 791                 core->rds_fifo_depth = 20;
 792         } else {
 793                 INIT_DELAYED_WORK(&core->status_monitor,
 794                                   si476x_core_poll_loop);
 795                 dev_info(&client->dev,
 796                          "No IRQ number specified, will use polling\n");
 797
 798                 core->rds_fifo_depth = 5;
 799         }
 800
 801         core->chip_id = id->driver_data;
 802
 803         rval = si476x_core_get_revision_info(core);
 804         if (rval < 0) {
 805                 rval = -ENODEV;
 806                 goto free_kfifo;
 807         }
 808
 809         cell_num = 0;
 810
 811         cell = &core->cells[SI476X_RADIO_CELL];
 812         cell->name = "si476x-radio";
 813         cell_num++;
 814
 815 #ifdef CONFIG_SND_SOC_SI476X
 816         if ((core->chip_id == SI476X_CHIP_SI4761 ||
 817              core->chip_id == SI476X_CHIP_SI4764)       &&
 818             core->pinmux.dclk == SI476X_DCLK_DAUDIO     &&
 819             core->pinmux.dfs  == SI476X_DFS_DAUDIO      &&
 820             core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
 821             core->pinmux.xout == SI476X_XOUT_TRISTATE) {
 822                 cell = &core->cells[SI476X_CODEC_CELL];
 823                 cell->name          = "si476x-codec";
 824                 cell_num++;
 825         }
 826 #endif
 827         rval = mfd_add_devices(&client->dev,
 828                                (client->adapter->nr << 8) + client->addr,
 829                                core->cells, cell_num,
 830                                NULL, 0, NULL);
 831         if (!rval)
 832                 return 0;
 833
 834 free_kfifo:
 835         kfifo_free(&core->rds_fifo);
 836
 837 free_gpio:
 838         if (gpio_is_valid(core->gpio_reset))
 839                 gpio_free(core->gpio_reset);
 840
 841         return rval;
 842 }
 843
 844 static int si476x_core_remove(struct i2c_client *client)
 845 {
 846         struct si476x_core *core = i2c_get_clientdata(client);
 847
 848         si476x_core_pronounce_dead(core);
 849         mfd_remove_devices(&client->dev);
 850
 851         if (client->irq)
 852                 disable_irq(client->irq);
 853         else
 854                 cancel_delayed_work_sync(&core->status_monitor);
 855
 856         kfifo_free(&core->rds_fifo);
 857
 858         if (gpio_is_valid(core->gpio_reset))
 859                 gpio_free(core->gpio_reset);
 860
 861         return 0;
 862 }
 863
 864
 865 static const struct i2c_device_id si476x_id[] = {
 866         { "si4761", SI476X_CHIP_SI4761 },
 867         { "si4764", SI476X_CHIP_SI4764 },
 868         { "si4768", SI476X_CHIP_SI4768 },
 869         { },
 870 };
 871 MODULE_DEVICE_TABLE(i2c, si476x_id);
 872
 873 static struct i2c_driver si476x_core_driver = {
 874         .driver         = {
 875                 .name   = "si476x-core",
 876         },
 877         .probe          = si476x_core_probe,
 878         .remove         = si476x_core_remove,
 879         .id_table       = si476x_id,
 880 };
 881 module_i2c_driver(si476x_core_driver);
 882
 883
 884 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 885 MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
 886 MODULE_LICENSE("GPL");