wm8994-core.c revision f40dff9edbf1daa14068542d60ae22df78e8c74a
1/* 2 * wm8994-core.c -- Device access for Wolfson WM8994 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15#include <linux/kernel.h> 16#include <linux/module.h> 17#include <linux/slab.h> 18#include <linux/i2c.h> 19#include <linux/delay.h> 20#include <linux/mfd/core.h> 21#include <linux/pm_runtime.h> 22#include <linux/regulator/consumer.h> 23#include <linux/regulator/machine.h> 24 25#include <linux/mfd/wm8994/core.h> 26#include <linux/mfd/wm8994/pdata.h> 27#include <linux/mfd/wm8994/registers.h> 28 29static int wm8994_read(struct wm8994 *wm8994, unsigned short reg, 30 int bytes, void *dest) 31{ 32 int ret, i; 33 u16 *buf = dest; 34 35 BUG_ON(bytes % 2); 36 BUG_ON(bytes <= 0); 37 38 ret = wm8994->read_dev(wm8994, reg, bytes, dest); 39 if (ret < 0) 40 return ret; 41 42 for (i = 0; i < bytes / 2; i++) { 43 buf[i] = be16_to_cpu(buf[i]); 44 45 dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n", 46 buf[i], reg + i, reg + i); 47 } 48 49 return 0; 50} 51 52/** 53 * wm8994_reg_read: Read a single WM8994 register. 54 * 55 * @wm8994: Device to read from. 56 * @reg: Register to read. 57 */ 58int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg) 59{ 60 unsigned short val; 61 int ret; 62 63 mutex_lock(&wm8994->io_lock); 64 65 ret = wm8994_read(wm8994, reg, 2, &val); 66 67 mutex_unlock(&wm8994->io_lock); 68 69 if (ret < 0) 70 return ret; 71 else 72 return val; 73} 74EXPORT_SYMBOL_GPL(wm8994_reg_read); 75 76/** 77 * wm8994_bulk_read: Read multiple WM8994 registers 78 * 79 * @wm8994: Device to read from 80 * @reg: First register 81 * @count: Number of registers 82 * @buf: Buffer to fill. 83 */ 84int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg, 85 int count, u16 *buf) 86{ 87 int ret; 88 89 mutex_lock(&wm8994->io_lock); 90 91 ret = wm8994_read(wm8994, reg, count * 2, buf); 92 93 mutex_unlock(&wm8994->io_lock); 94 95 return ret; 96} 97EXPORT_SYMBOL_GPL(wm8994_bulk_read); 98 99static int wm8994_write(struct wm8994 *wm8994, unsigned short reg, 100 int bytes, void *src) 101{ 102 u16 *buf = src; 103 int i; 104 105 BUG_ON(bytes % 2); 106 BUG_ON(bytes <= 0); 107 108 for (i = 0; i < bytes / 2; i++) { 109 dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n", 110 buf[i], reg + i, reg + i); 111 112 buf[i] = cpu_to_be16(buf[i]); 113 } 114 115 return wm8994->write_dev(wm8994, reg, bytes, src); 116} 117 118/** 119 * wm8994_reg_write: Write a single WM8994 register. 120 * 121 * @wm8994: Device to write to. 122 * @reg: Register to write to. 123 * @val: Value to write. 124 */ 125int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg, 126 unsigned short val) 127{ 128 int ret; 129 130 mutex_lock(&wm8994->io_lock); 131 132 ret = wm8994_write(wm8994, reg, 2, &val); 133 134 mutex_unlock(&wm8994->io_lock); 135 136 return ret; 137} 138EXPORT_SYMBOL_GPL(wm8994_reg_write); 139 140/** 141 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register 142 * 143 * @wm8994: Device to write to. 144 * @reg: Register to write to. 145 * @mask: Mask of bits to set. 146 * @val: Value to set (unshifted) 147 */ 148int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg, 149 unsigned short mask, unsigned short val) 150{ 151 int ret; 152 u16 r; 153 154 mutex_lock(&wm8994->io_lock); 155 156 ret = wm8994_read(wm8994, reg, 2, &r); 157 if (ret < 0) 158 goto out; 159 160 r &= ~mask; 161 r |= val; 162 163 ret = wm8994_write(wm8994, reg, 2, &r); 164 165out: 166 mutex_unlock(&wm8994->io_lock); 167 168 return ret; 169} 170EXPORT_SYMBOL_GPL(wm8994_set_bits); 171 172static struct mfd_cell wm8994_regulator_devs[] = { 173 { 174 .name = "wm8994-ldo", 175 .id = 1, 176 .pm_runtime_no_callbacks = true, 177 }, 178 { 179 .name = "wm8994-ldo", 180 .id = 2, 181 .pm_runtime_no_callbacks = true, 182 }, 183}; 184 185static struct resource wm8994_codec_resources[] = { 186 { 187 .start = WM8994_IRQ_TEMP_SHUT, 188 .end = WM8994_IRQ_TEMP_WARN, 189 .flags = IORESOURCE_IRQ, 190 }, 191}; 192 193static struct resource wm8994_gpio_resources[] = { 194 { 195 .start = WM8994_IRQ_GPIO(1), 196 .end = WM8994_IRQ_GPIO(11), 197 .flags = IORESOURCE_IRQ, 198 }, 199}; 200 201static struct mfd_cell wm8994_devs[] = { 202 { 203 .name = "wm8994-codec", 204 .num_resources = ARRAY_SIZE(wm8994_codec_resources), 205 .resources = wm8994_codec_resources, 206 }, 207 208 { 209 .name = "wm8994-gpio", 210 .num_resources = ARRAY_SIZE(wm8994_gpio_resources), 211 .resources = wm8994_gpio_resources, 212 .pm_runtime_no_callbacks = true, 213 }, 214}; 215 216/* 217 * Supplies for the main bulk of CODEC; the LDO supplies are ignored 218 * and should be handled via the standard regulator API supply 219 * management. 220 */ 221static const char *wm8994_main_supplies[] = { 222 "DBVDD", 223 "DCVDD", 224 "AVDD1", 225 "AVDD2", 226 "CPVDD", 227 "SPKVDD1", 228 "SPKVDD2", 229}; 230 231static const char *wm8958_main_supplies[] = { 232 "DBVDD1", 233 "DBVDD2", 234 "DBVDD3", 235 "DCVDD", 236 "AVDD1", 237 "AVDD2", 238 "CPVDD", 239 "SPKVDD1", 240 "SPKVDD2", 241}; 242 243#ifdef CONFIG_PM 244static int wm8994_suspend(struct device *dev) 245{ 246 struct wm8994 *wm8994 = dev_get_drvdata(dev); 247 int ret; 248 249 /* Don't actually go through with the suspend if the CODEC is 250 * still active (eg, for audio passthrough from CP. */ 251 ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1); 252 if (ret < 0) { 253 dev_err(dev, "Failed to read power status: %d\n", ret); 254 } else if (ret & WM8994_VMID_SEL_MASK) { 255 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 256 return 0; 257 } 258 259 /* GPIO configuration state is saved here since we may be configuring 260 * the GPIO alternate functions even if we're not using the gpiolib 261 * driver for them. 262 */ 263 ret = wm8994_read(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2, 264 &wm8994->gpio_regs); 265 if (ret < 0) 266 dev_err(dev, "Failed to save GPIO registers: %d\n", ret); 267 268 /* For similar reasons we also stash the regulator states */ 269 ret = wm8994_read(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2, 270 &wm8994->ldo_regs); 271 if (ret < 0) 272 dev_err(dev, "Failed to save LDO registers: %d\n", ret); 273 274 /* Explicitly put the device into reset in case regulators 275 * don't get disabled in order to ensure consistent restart. 276 */ 277 wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 0x8994); 278 279 wm8994->suspended = true; 280 281 ret = regulator_bulk_disable(wm8994->num_supplies, 282 wm8994->supplies); 283 if (ret != 0) { 284 dev_err(dev, "Failed to disable supplies: %d\n", ret); 285 return ret; 286 } 287 288 return 0; 289} 290 291static int wm8994_resume(struct device *dev) 292{ 293 struct wm8994 *wm8994 = dev_get_drvdata(dev); 294 int ret; 295 296 /* We may have lied to the PM core about suspending */ 297 if (!wm8994->suspended) 298 return 0; 299 300 ret = regulator_bulk_enable(wm8994->num_supplies, 301 wm8994->supplies); 302 if (ret != 0) { 303 dev_err(dev, "Failed to enable supplies: %d\n", ret); 304 return ret; 305 } 306 307 ret = wm8994_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK, 308 WM8994_NUM_IRQ_REGS * 2, &wm8994->irq_masks_cur); 309 if (ret < 0) 310 dev_err(dev, "Failed to restore interrupt masks: %d\n", ret); 311 312 ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2, 313 &wm8994->ldo_regs); 314 if (ret < 0) 315 dev_err(dev, "Failed to restore LDO registers: %d\n", ret); 316 317 ret = wm8994_write(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2, 318 &wm8994->gpio_regs); 319 if (ret < 0) 320 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret); 321 322 wm8994->suspended = false; 323 324 return 0; 325} 326#endif 327 328#ifdef CONFIG_REGULATOR 329static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) 330{ 331 struct wm8994_ldo_pdata *ldo_pdata; 332 333 if (!pdata) 334 return 0; 335 336 ldo_pdata = &pdata->ldo[ldo]; 337 338 if (!ldo_pdata->init_data) 339 return 0; 340 341 return ldo_pdata->init_data->num_consumer_supplies != 0; 342} 343#else 344static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) 345{ 346 return 0; 347} 348#endif 349 350/* 351 * Instantiate the generic non-control parts of the device. 352 */ 353static int wm8994_device_init(struct wm8994 *wm8994, int irq) 354{ 355 struct wm8994_pdata *pdata = wm8994->dev->platform_data; 356 const char *devname; 357 int ret, i; 358 359 mutex_init(&wm8994->io_lock); 360 dev_set_drvdata(wm8994->dev, wm8994); 361 362 /* Add the on-chip regulators first for bootstrapping */ 363 ret = mfd_add_devices(wm8994->dev, -1, 364 wm8994_regulator_devs, 365 ARRAY_SIZE(wm8994_regulator_devs), 366 NULL, 0); 367 if (ret != 0) { 368 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 369 goto err; 370 } 371 372 switch (wm8994->type) { 373 case WM8994: 374 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies); 375 break; 376 case WM8958: 377 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies); 378 break; 379 default: 380 BUG(); 381 return -EINVAL; 382 } 383 384 wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) * 385 wm8994->num_supplies, 386 GFP_KERNEL); 387 if (!wm8994->supplies) { 388 ret = -ENOMEM; 389 goto err; 390 } 391 392 switch (wm8994->type) { 393 case WM8994: 394 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++) 395 wm8994->supplies[i].supply = wm8994_main_supplies[i]; 396 break; 397 case WM8958: 398 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++) 399 wm8994->supplies[i].supply = wm8958_main_supplies[i]; 400 break; 401 default: 402 BUG(); 403 return -EINVAL; 404 } 405 406 ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies, 407 wm8994->supplies); 408 if (ret != 0) { 409 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret); 410 goto err_supplies; 411 } 412 413 ret = regulator_bulk_enable(wm8994->num_supplies, 414 wm8994->supplies); 415 if (ret != 0) { 416 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret); 417 goto err_get; 418 } 419 420 ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET); 421 if (ret < 0) { 422 dev_err(wm8994->dev, "Failed to read ID register\n"); 423 goto err_enable; 424 } 425 switch (ret) { 426 case 0x8994: 427 devname = "WM8994"; 428 if (wm8994->type != WM8994) 429 dev_warn(wm8994->dev, "Device registered as type %d\n", 430 wm8994->type); 431 wm8994->type = WM8994; 432 break; 433 case 0x8958: 434 devname = "WM8958"; 435 if (wm8994->type != WM8958) 436 dev_warn(wm8994->dev, "Device registered as type %d\n", 437 wm8994->type); 438 wm8994->type = WM8958; 439 break; 440 default: 441 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n", 442 ret); 443 ret = -EINVAL; 444 goto err_enable; 445 } 446 447 ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION); 448 if (ret < 0) { 449 dev_err(wm8994->dev, "Failed to read revision register: %d\n", 450 ret); 451 goto err_enable; 452 } 453 454 switch (ret) { 455 case 0: 456 case 1: 457 if (wm8994->type == WM8994) 458 dev_warn(wm8994->dev, 459 "revision %c not fully supported\n", 460 'A' + ret); 461 break; 462 default: 463 break; 464 } 465 466 dev_info(wm8994->dev, "%s revision %c\n", devname, 'A' + ret); 467 468 if (pdata) { 469 wm8994->irq_base = pdata->irq_base; 470 wm8994->gpio_base = pdata->gpio_base; 471 472 /* GPIO configuration is only applied if it's non-zero */ 473 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { 474 if (pdata->gpio_defaults[i]) { 475 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i, 476 0xffff, 477 pdata->gpio_defaults[i]); 478 } 479 } 480 } 481 482 /* In some system designs where the regulators are not in use, 483 * we can achieve a small reduction in leakage currents by 484 * floating LDO outputs. This bit makes no difference if the 485 * LDOs are enabled, it only affects cases where the LDOs were 486 * in operation and are then disabled. 487 */ 488 for (i = 0; i < WM8994_NUM_LDO_REGS; i++) { 489 if (wm8994_ldo_in_use(pdata, i)) 490 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 491 WM8994_LDO1_DISCH, WM8994_LDO1_DISCH); 492 else 493 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 494 WM8994_LDO1_DISCH, 0); 495 } 496 497 wm8994_irq_init(wm8994); 498 499 ret = mfd_add_devices(wm8994->dev, -1, 500 wm8994_devs, ARRAY_SIZE(wm8994_devs), 501 NULL, 0); 502 if (ret != 0) { 503 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 504 goto err_irq; 505 } 506 507 pm_runtime_enable(wm8994->dev); 508 pm_runtime_resume(wm8994->dev); 509 510 return 0; 511 512err_irq: 513 wm8994_irq_exit(wm8994); 514err_enable: 515 regulator_bulk_disable(wm8994->num_supplies, 516 wm8994->supplies); 517err_get: 518 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); 519err_supplies: 520 kfree(wm8994->supplies); 521err: 522 mfd_remove_devices(wm8994->dev); 523 kfree(wm8994); 524 return ret; 525} 526 527static void wm8994_device_exit(struct wm8994 *wm8994) 528{ 529 pm_runtime_disable(wm8994->dev); 530 mfd_remove_devices(wm8994->dev); 531 wm8994_irq_exit(wm8994); 532 regulator_bulk_disable(wm8994->num_supplies, 533 wm8994->supplies); 534 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); 535 kfree(wm8994->supplies); 536 kfree(wm8994); 537} 538 539static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg, 540 int bytes, void *dest) 541{ 542 struct i2c_client *i2c = wm8994->control_data; 543 int ret; 544 u16 r = cpu_to_be16(reg); 545 546 ret = i2c_master_send(i2c, (unsigned char *)&r, 2); 547 if (ret < 0) 548 return ret; 549 if (ret != 2) 550 return -EIO; 551 552 ret = i2c_master_recv(i2c, dest, bytes); 553 if (ret < 0) 554 return ret; 555 if (ret != bytes) 556 return -EIO; 557 return 0; 558} 559 560/* Currently we allocate the write buffer on the stack; this is OK for 561 * small writes - if we need to do large writes this will need to be 562 * revised. 563 */ 564static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg, 565 int bytes, void *src) 566{ 567 struct i2c_client *i2c = wm8994->control_data; 568 unsigned char msg[bytes + 2]; 569 int ret; 570 571 reg = cpu_to_be16(reg); 572 memcpy(&msg[0], ®, 2); 573 memcpy(&msg[2], src, bytes); 574 575 ret = i2c_master_send(i2c, msg, bytes + 2); 576 if (ret < 0) 577 return ret; 578 if (ret < bytes + 2) 579 return -EIO; 580 581 return 0; 582} 583 584static int wm8994_i2c_probe(struct i2c_client *i2c, 585 const struct i2c_device_id *id) 586{ 587 struct wm8994 *wm8994; 588 589 wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL); 590 if (wm8994 == NULL) 591 return -ENOMEM; 592 593 i2c_set_clientdata(i2c, wm8994); 594 wm8994->dev = &i2c->dev; 595 wm8994->control_data = i2c; 596 wm8994->read_dev = wm8994_i2c_read_device; 597 wm8994->write_dev = wm8994_i2c_write_device; 598 wm8994->irq = i2c->irq; 599 wm8994->type = id->driver_data; 600 601 return wm8994_device_init(wm8994, i2c->irq); 602} 603 604static int wm8994_i2c_remove(struct i2c_client *i2c) 605{ 606 struct wm8994 *wm8994 = i2c_get_clientdata(i2c); 607 608 wm8994_device_exit(wm8994); 609 610 return 0; 611} 612 613static const struct i2c_device_id wm8994_i2c_id[] = { 614 { "wm8994", WM8994 }, 615 { "wm8958", WM8958 }, 616 { } 617}; 618MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id); 619 620UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume, NULL); 621 622static struct i2c_driver wm8994_i2c_driver = { 623 .driver = { 624 .name = "wm8994", 625 .owner = THIS_MODULE, 626 .pm = &wm8994_pm_ops, 627 }, 628 .probe = wm8994_i2c_probe, 629 .remove = wm8994_i2c_remove, 630 .id_table = wm8994_i2c_id, 631}; 632 633static int __init wm8994_i2c_init(void) 634{ 635 int ret; 636 637 ret = i2c_add_driver(&wm8994_i2c_driver); 638 if (ret != 0) 639 pr_err("Failed to register wm8994 I2C driver: %d\n", ret); 640 641 return ret; 642} 643module_init(wm8994_i2c_init); 644 645static void __exit wm8994_i2c_exit(void) 646{ 647 i2c_del_driver(&wm8994_i2c_driver); 648} 649module_exit(wm8994_i2c_exit); 650 651MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC"); 652MODULE_LICENSE("GPL"); 653MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 654