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 comptible 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, "Failet to gett 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 client->name, core); 782 if (rval < 0) { 783 dev_err(&client->dev, "Could not request IRQ %d\n", 784 client->irq); 785 goto free_kfifo; 786 } 787 disable_irq(client->irq); 788 dev_dbg(&client->dev, "IRQ requested.\n"); 789 790 core->rds_fifo_depth = 20; 791 } else { 792 INIT_DELAYED_WORK(&core->status_monitor, 793 si476x_core_poll_loop); 794 dev_info(&client->dev, 795 "No IRQ number specified, will use polling\n"); 796 797 core->rds_fifo_depth = 5; 798 } 799 800 core->chip_id = id->driver_data; 801 802 rval = si476x_core_get_revision_info(core); 803 if (rval < 0) { 804 rval = -ENODEV; 805 goto free_kfifo; 806 } 807 808 cell_num = 0; 809 810 cell = &core->cells[SI476X_RADIO_CELL]; 811 cell->name = "si476x-radio"; 812 cell_num++; 813 814 #ifdef CONFIG_SND_SOC_SI476X 815 if ((core->chip_id == SI476X_CHIP_SI4761 || 816 core->chip_id == SI476X_CHIP_SI4764) && 817 core->pinmux.dclk == SI476X_DCLK_DAUDIO && 818 core->pinmux.dfs == SI476X_DFS_DAUDIO && 819 core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT && 820 core->pinmux.xout == SI476X_XOUT_TRISTATE) { 821 cell = &core->cells[SI476X_CODEC_CELL]; 822 cell->name = "si476x-codec"; 823 cell_num++; 824 } 825 #endif 826 rval = mfd_add_devices(&client->dev, 827 (client->adapter->nr << 8) + client->addr, 828 core->cells, cell_num, 829 NULL, 0, NULL); 830 if (!rval) 831 return 0; 832 833 free_kfifo: 834 kfifo_free(&core->rds_fifo); 835 836 free_gpio: 837 if (gpio_is_valid(core->gpio_reset)) 838 gpio_free(core->gpio_reset); 839 840 return rval; 841 } 842 843 static int si476x_core_remove(struct i2c_client *client) 844 { 845 struct si476x_core *core = i2c_get_clientdata(client); 846 847 si476x_core_pronounce_dead(core); 848 mfd_remove_devices(&client->dev); 849 850 if (client->irq) 851 disable_irq(client->irq); 852 else 853 cancel_delayed_work_sync(&core->status_monitor); 854 855 kfifo_free(&core->rds_fifo); 856 857 if (gpio_is_valid(core->gpio_reset)) 858 gpio_free(core->gpio_reset); 859 860 return 0; 861 } 862 863 864 static const struct i2c_device_id si476x_id[] = { 865 { "si4761", SI476X_CHIP_SI4761 }, 866 { "si4764", SI476X_CHIP_SI4764 }, 867 { "si4768", SI476X_CHIP_SI4768 }, 868 { }, 869 }; 870 MODULE_DEVICE_TABLE(i2c, si476x_id); 871 872 static struct i2c_driver si476x_core_driver = { 873 .driver = { 874 .name = "si476x-core", 875 .owner = THIS_MODULE, 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"); 887