Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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", |
Hans Verkuil | 4adedc5 | 2013-04-19 18:40:05 +0200 | [diff] [blame] | 392 | (int)sizeof(report.rds), report.rds); |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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, " |
Colin Ian King | 521d935 | 2016-06-04 20:19:58 +0100 | [diff] [blame] | 603 | "reverting to A10 compatible functions\n", |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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 | |
Jingoo Han | 334a41c | 2013-07-30 17:10:05 +0900 | [diff] [blame] | 721 | pdata = dev_get_platdata(&client->dev); |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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) { |
Colin Ian King | d4c55da | 2016-10-28 19:35:48 +0100 | [diff] [blame] | 756 | dev_err(&client->dev, "Failed to get all of the regulators\n"); |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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) { |
Masanari Iida | f42cf8d | 2015-02-24 23:11:26 +0900 | [diff] [blame] | 769 | dev_err(&client->dev, "Could not allocate the FIFO\n"); |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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, |
Fabio Estevam | ef76cc5 | 2015-05-16 15:42:17 -0300 | [diff] [blame] | 780 | IRQF_TRIGGER_FALLING | |
| 781 | IRQF_ONESHOT, |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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", |
Andrey Smirnov | 730a30a | 2013-04-18 09:58:28 -0700 | [diff] [blame] | 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"); |