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 { 688 const struct i2c_device_id *id = i2c_client_get_device_id(client); 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"); 879