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/err.h> 20 #include <linux/delay.h> 21 #include <linux/mfd/core.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/of_gpio.h> 25 #include <linux/pm_runtime.h> 26 #include <linux/regmap.h> 27 #include <linux/regulator/consumer.h> 28 #include <linux/regulator/machine.h> 29 30 #include <linux/mfd/wm8994/core.h> 31 #include <linux/mfd/wm8994/pdata.h> 32 #include <linux/mfd/wm8994/registers.h> 33 34 #include "wm8994.h" 35 36 static const struct mfd_cell wm8994_regulator_devs[] = { 37 { 38 .name = "wm8994-ldo", 39 .id = 0, 40 .pm_runtime_no_callbacks = true, 41 }, 42 { 43 .name = "wm8994-ldo", 44 .id = 1, 45 .pm_runtime_no_callbacks = true, 46 }, 47 }; 48 49 static struct resource wm8994_codec_resources[] = { 50 { 51 .start = WM8994_IRQ_TEMP_SHUT, 52 .end = WM8994_IRQ_TEMP_WARN, 53 .flags = IORESOURCE_IRQ, 54 }, 55 }; 56 57 static struct resource wm8994_gpio_resources[] = { 58 { 59 .start = WM8994_IRQ_GPIO(1), 60 .end = WM8994_IRQ_GPIO(11), 61 .flags = IORESOURCE_IRQ, 62 }, 63 }; 64 65 static const struct mfd_cell wm8994_devs[] = { 66 { 67 .name = "wm8994-codec", 68 .num_resources = ARRAY_SIZE(wm8994_codec_resources), 69 .resources = wm8994_codec_resources, 70 }, 71 72 { 73 .name = "wm8994-gpio", 74 .num_resources = ARRAY_SIZE(wm8994_gpio_resources), 75 .resources = wm8994_gpio_resources, 76 .pm_runtime_no_callbacks = true, 77 }, 78 }; 79 80 /* 81 * Supplies for the main bulk of CODEC; the LDO supplies are ignored 82 * and should be handled via the standard regulator API supply 83 * management. 84 */ 85 static const char *wm1811_main_supplies[] = { 86 "DBVDD1", 87 "DBVDD2", 88 "DBVDD3", 89 "DCVDD", 90 "AVDD1", 91 "AVDD2", 92 "CPVDD", 93 "SPKVDD1", 94 "SPKVDD2", 95 }; 96 97 static const char *wm8994_main_supplies[] = { 98 "DBVDD", 99 "DCVDD", 100 "AVDD1", 101 "AVDD2", 102 "CPVDD", 103 "SPKVDD1", 104 "SPKVDD2", 105 }; 106 107 static const char *wm8958_main_supplies[] = { 108 "DBVDD1", 109 "DBVDD2", 110 "DBVDD3", 111 "DCVDD", 112 "AVDD1", 113 "AVDD2", 114 "CPVDD", 115 "SPKVDD1", 116 "SPKVDD2", 117 }; 118 119 #ifdef CONFIG_PM 120 static int wm8994_suspend(struct device *dev) 121 { 122 struct wm8994 *wm8994 = dev_get_drvdata(dev); 123 int ret; 124 125 /* Don't actually go through with the suspend if the CODEC is 126 * still active for accessory detect. */ 127 switch (wm8994->type) { 128 case WM8958: 129 case WM1811: 130 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1); 131 if (ret < 0) { 132 dev_err(dev, "Failed to read power status: %d\n", ret); 133 } else if (ret & WM8958_MICD_ENA) { 134 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 135 return 0; 136 } 137 break; 138 default: 139 break; 140 } 141 142 /* Disable LDO pulldowns while the device is suspended if we 143 * don't know that something will be driving them. */ 144 if (!wm8994->ldo_ena_always_driven) 145 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 146 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, 147 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD); 148 149 /* Explicitly put the device into reset in case regulators 150 * don't get disabled in order to ensure consistent restart. 151 */ 152 wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 153 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET)); 154 155 regcache_mark_dirty(wm8994->regmap); 156 157 /* Restore GPIO registers to prevent problems with mismatched 158 * pin configurations. 159 */ 160 ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1, 161 WM8994_GPIO_11); 162 if (ret != 0) 163 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret); 164 165 /* In case one of the GPIOs is used as a wake input. */ 166 ret = regcache_sync_region(wm8994->regmap, 167 WM8994_INTERRUPT_STATUS_1_MASK, 168 WM8994_INTERRUPT_STATUS_1_MASK); 169 if (ret != 0) 170 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret); 171 172 regcache_cache_only(wm8994->regmap, true); 173 wm8994->suspended = true; 174 175 ret = regulator_bulk_disable(wm8994->num_supplies, 176 wm8994->supplies); 177 if (ret != 0) { 178 dev_err(dev, "Failed to disable supplies: %d\n", ret); 179 return ret; 180 } 181 182 return 0; 183 } 184 185 static int wm8994_resume(struct device *dev) 186 { 187 struct wm8994 *wm8994 = dev_get_drvdata(dev); 188 int ret; 189 190 /* We may have lied to the PM core about suspending */ 191 if (!wm8994->suspended) 192 return 0; 193 194 ret = regulator_bulk_enable(wm8994->num_supplies, 195 wm8994->supplies); 196 if (ret != 0) { 197 dev_err(dev, "Failed to enable supplies: %d\n", ret); 198 return ret; 199 } 200 201 regcache_cache_only(wm8994->regmap, false); 202 ret = regcache_sync(wm8994->regmap); 203 if (ret != 0) { 204 dev_err(dev, "Failed to restore register map: %d\n", ret); 205 goto err_enable; 206 } 207 208 /* Disable LDO pulldowns while the device is active */ 209 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 210 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, 211 0); 212 213 wm8994->suspended = false; 214 215 return 0; 216 217 err_enable: 218 regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies); 219 220 return ret; 221 } 222 #endif 223 224 #ifdef CONFIG_REGULATOR 225 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) 226 { 227 struct wm8994_ldo_pdata *ldo_pdata; 228 229 if (!pdata) 230 return 0; 231 232 ldo_pdata = &pdata->ldo[ldo]; 233 234 if (!ldo_pdata->init_data) 235 return 0; 236 237 return ldo_pdata->init_data->num_consumer_supplies != 0; 238 } 239 #else 240 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) 241 { 242 return 0; 243 } 244 #endif 245 246 static const struct reg_sequence wm8994_revc_patch[] = { 247 { 0x102, 0x3 }, 248 { 0x56, 0x3 }, 249 { 0x817, 0x0 }, 250 { 0x102, 0x0 }, 251 }; 252 253 static const struct reg_sequence wm8958_reva_patch[] = { 254 { 0x102, 0x3 }, 255 { 0xcb, 0x81 }, 256 { 0x817, 0x0 }, 257 { 0x102, 0x0 }, 258 }; 259 260 static const struct reg_sequence wm1811_reva_patch[] = { 261 { 0x102, 0x3 }, 262 { 0x56, 0xc07 }, 263 { 0x5d, 0x7e }, 264 { 0x5e, 0x0 }, 265 { 0x102, 0x0 }, 266 }; 267 268 #ifdef CONFIG_OF 269 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994) 270 { 271 struct device_node *np = wm8994->dev->of_node; 272 struct wm8994_pdata *pdata = &wm8994->pdata; 273 int i; 274 275 if (!np) 276 return 0; 277 278 if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults, 279 ARRAY_SIZE(pdata->gpio_defaults)) >= 0) { 280 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { 281 if (wm8994->pdata.gpio_defaults[i] == 0) 282 pdata->gpio_defaults[i] 283 = WM8994_CONFIGURE_GPIO; 284 } 285 } 286 287 of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias, 288 ARRAY_SIZE(pdata->micbias)); 289 290 pdata->lineout1_diff = true; 291 pdata->lineout2_diff = true; 292 if (of_find_property(np, "wlf,lineout1-se", NULL)) 293 pdata->lineout1_diff = false; 294 if (of_find_property(np, "wlf,lineout2-se", NULL)) 295 pdata->lineout2_diff = false; 296 297 if (of_find_property(np, "wlf,lineout1-feedback", NULL)) 298 pdata->lineout1fb = true; 299 if (of_find_property(np, "wlf,lineout2-feedback", NULL)) 300 pdata->lineout2fb = true; 301 302 if (of_find_property(np, "wlf,ldoena-always-driven", NULL)) 303 pdata->lineout2fb = true; 304 305 pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0); 306 if (pdata->ldo[0].enable < 0) 307 pdata->ldo[0].enable = 0; 308 309 pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0); 310 if (pdata->ldo[1].enable < 0) 311 pdata->ldo[1].enable = 0; 312 313 return 0; 314 } 315 #else 316 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994) 317 { 318 return 0; 319 } 320 #endif 321 322 /* 323 * Instantiate the generic non-control parts of the device. 324 */ 325 static int wm8994_device_init(struct wm8994 *wm8994, int irq) 326 { 327 struct wm8994_pdata *pdata; 328 struct regmap_config *regmap_config; 329 const struct reg_sequence *regmap_patch = NULL; 330 const char *devname; 331 int ret, i, patch_regs = 0; 332 int pulls = 0; 333 334 if (dev_get_platdata(wm8994->dev)) { 335 pdata = dev_get_platdata(wm8994->dev); 336 wm8994->pdata = *pdata; 337 } 338 pdata = &wm8994->pdata; 339 340 ret = wm8994_set_pdata_from_of(wm8994); 341 if (ret != 0) 342 return ret; 343 344 dev_set_drvdata(wm8994->dev, wm8994); 345 346 /* Add the on-chip regulators first for bootstrapping */ 347 ret = mfd_add_devices(wm8994->dev, 0, 348 wm8994_regulator_devs, 349 ARRAY_SIZE(wm8994_regulator_devs), 350 NULL, 0, NULL); 351 if (ret != 0) { 352 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 353 goto err; 354 } 355 356 switch (wm8994->type) { 357 case WM1811: 358 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies); 359 break; 360 case WM8994: 361 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies); 362 break; 363 case WM8958: 364 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies); 365 break; 366 default: 367 BUG(); 368 goto err; 369 } 370 371 wm8994->supplies = devm_kcalloc(wm8994->dev, 372 wm8994->num_supplies, 373 sizeof(struct regulator_bulk_data), 374 GFP_KERNEL); 375 if (!wm8994->supplies) { 376 ret = -ENOMEM; 377 goto err; 378 } 379 380 switch (wm8994->type) { 381 case WM1811: 382 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++) 383 wm8994->supplies[i].supply = wm1811_main_supplies[i]; 384 break; 385 case WM8994: 386 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++) 387 wm8994->supplies[i].supply = wm8994_main_supplies[i]; 388 break; 389 case WM8958: 390 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++) 391 wm8994->supplies[i].supply = wm8958_main_supplies[i]; 392 break; 393 default: 394 BUG(); 395 goto err; 396 } 397 398 /* 399 * Can't use devres helper here as some of the supplies are provided by 400 * wm8994->dev's children (regulators) and those regulators are 401 * unregistered by the devres core before the supplies are freed. 402 */ 403 ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies, 404 wm8994->supplies); 405 if (ret != 0) { 406 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret); 407 goto err; 408 } 409 410 ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies); 411 if (ret != 0) { 412 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret); 413 goto err_regulator_free; 414 } 415 416 ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET); 417 if (ret < 0) { 418 dev_err(wm8994->dev, "Failed to read ID register\n"); 419 goto err_enable; 420 } 421 switch (ret) { 422 case 0x1811: 423 devname = "WM1811"; 424 if (wm8994->type != WM1811) 425 dev_warn(wm8994->dev, "Device registered as type %d\n", 426 wm8994->type); 427 wm8994->type = WM1811; 428 break; 429 case 0x8994: 430 devname = "WM8994"; 431 if (wm8994->type != WM8994) 432 dev_warn(wm8994->dev, "Device registered as type %d\n", 433 wm8994->type); 434 wm8994->type = WM8994; 435 break; 436 case 0x8958: 437 devname = "WM8958"; 438 if (wm8994->type != WM8958) 439 dev_warn(wm8994->dev, "Device registered as type %d\n", 440 wm8994->type); 441 wm8994->type = WM8958; 442 break; 443 default: 444 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n", 445 ret); 446 ret = -EINVAL; 447 goto err_enable; 448 } 449 450 ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION); 451 if (ret < 0) { 452 dev_err(wm8994->dev, "Failed to read revision register: %d\n", 453 ret); 454 goto err_enable; 455 } 456 wm8994->revision = ret & WM8994_CHIP_REV_MASK; 457 wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT; 458 459 switch (wm8994->type) { 460 case WM8994: 461 switch (wm8994->revision) { 462 case 0: 463 case 1: 464 dev_warn(wm8994->dev, 465 "revision %c not fully supported\n", 466 'A' + wm8994->revision); 467 break; 468 case 2: 469 case 3: 470 default: 471 regmap_patch = wm8994_revc_patch; 472 patch_regs = ARRAY_SIZE(wm8994_revc_patch); 473 break; 474 } 475 break; 476 477 case WM8958: 478 switch (wm8994->revision) { 479 case 0: 480 regmap_patch = wm8958_reva_patch; 481 patch_regs = ARRAY_SIZE(wm8958_reva_patch); 482 break; 483 default: 484 break; 485 } 486 break; 487 488 case WM1811: 489 /* Revision C did not change the relevant layer */ 490 if (wm8994->revision > 1) 491 wm8994->revision++; 492 493 regmap_patch = wm1811_reva_patch; 494 patch_regs = ARRAY_SIZE(wm1811_reva_patch); 495 break; 496 497 default: 498 break; 499 } 500 501 dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname, 502 'A' + wm8994->revision, wm8994->cust_id); 503 504 switch (wm8994->type) { 505 case WM1811: 506 regmap_config = &wm1811_regmap_config; 507 break; 508 case WM8994: 509 regmap_config = &wm8994_regmap_config; 510 break; 511 case WM8958: 512 regmap_config = &wm8958_regmap_config; 513 break; 514 default: 515 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type); 516 return -EINVAL; 517 } 518 519 ret = regmap_reinit_cache(wm8994->regmap, regmap_config); 520 if (ret != 0) { 521 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n", 522 ret); 523 return ret; 524 } 525 526 /* Explicitly put the device into reset in case regulators 527 * don't get disabled in order to ensure we know the device 528 * state. 529 */ 530 ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 531 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET)); 532 if (ret != 0) { 533 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret); 534 return ret; 535 } 536 537 if (regmap_patch) { 538 ret = regmap_register_patch(wm8994->regmap, regmap_patch, 539 patch_regs); 540 if (ret != 0) { 541 dev_err(wm8994->dev, "Failed to register patch: %d\n", 542 ret); 543 goto err; 544 } 545 } 546 547 wm8994->irq_base = pdata->irq_base; 548 wm8994->gpio_base = pdata->gpio_base; 549 550 /* GPIO configuration is only applied if it's non-zero */ 551 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { 552 if (pdata->gpio_defaults[i]) { 553 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i, 554 0xffff, pdata->gpio_defaults[i]); 555 } 556 } 557 558 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven; 559 560 if (pdata->spkmode_pu) 561 pulls |= WM8994_SPKMODE_PU; 562 563 /* Disable unneeded pulls */ 564 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 565 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD | 566 WM8994_SPKMODE_PU | WM8994_CSNADDR_PD, 567 pulls); 568 569 /* In some system designs where the regulators are not in use, 570 * we can achieve a small reduction in leakage currents by 571 * floating LDO outputs. This bit makes no difference if the 572 * LDOs are enabled, it only affects cases where the LDOs were 573 * in operation and are then disabled. 574 */ 575 for (i = 0; i < WM8994_NUM_LDO_REGS; i++) { 576 if (wm8994_ldo_in_use(pdata, i)) 577 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 578 WM8994_LDO1_DISCH, WM8994_LDO1_DISCH); 579 else 580 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 581 WM8994_LDO1_DISCH, 0); 582 } 583 584 wm8994_irq_init(wm8994); 585 586 ret = mfd_add_devices(wm8994->dev, -1, 587 wm8994_devs, ARRAY_SIZE(wm8994_devs), 588 NULL, 0, NULL); 589 if (ret != 0) { 590 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 591 goto err_irq; 592 } 593 594 pm_runtime_enable(wm8994->dev); 595 pm_runtime_idle(wm8994->dev); 596 597 return 0; 598 599 err_irq: 600 wm8994_irq_exit(wm8994); 601 err_enable: 602 regulator_bulk_disable(wm8994->num_supplies, 603 wm8994->supplies); 604 err_regulator_free: 605 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); 606 err: 607 mfd_remove_devices(wm8994->dev); 608 return ret; 609 } 610 611 static void wm8994_device_exit(struct wm8994 *wm8994) 612 { 613 pm_runtime_disable(wm8994->dev); 614 wm8994_irq_exit(wm8994); 615 regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies); 616 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); 617 mfd_remove_devices(wm8994->dev); 618 } 619 620 static const struct of_device_id wm8994_of_match[] = { 621 { .compatible = "wlf,wm1811", .data = (void *)WM1811 }, 622 { .compatible = "wlf,wm8994", .data = (void *)WM8994 }, 623 { .compatible = "wlf,wm8958", .data = (void *)WM8958 }, 624 { } 625 }; 626 MODULE_DEVICE_TABLE(of, wm8994_of_match); 627 628 static int wm8994_i2c_probe(struct i2c_client *i2c, 629 const struct i2c_device_id *id) 630 { 631 const struct of_device_id *of_id; 632 struct wm8994 *wm8994; 633 int ret; 634 635 wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL); 636 if (wm8994 == NULL) 637 return -ENOMEM; 638 639 i2c_set_clientdata(i2c, wm8994); 640 wm8994->dev = &i2c->dev; 641 wm8994->irq = i2c->irq; 642 643 if (i2c->dev.of_node) { 644 of_id = of_match_device(wm8994_of_match, &i2c->dev); 645 if (of_id) 646 wm8994->type = (enum wm8994_type)of_id->data; 647 } else { 648 wm8994->type = id->driver_data; 649 } 650 651 wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config); 652 if (IS_ERR(wm8994->regmap)) { 653 ret = PTR_ERR(wm8994->regmap); 654 dev_err(wm8994->dev, "Failed to allocate register map: %d\n", 655 ret); 656 return ret; 657 } 658 659 return wm8994_device_init(wm8994, i2c->irq); 660 } 661 662 static int wm8994_i2c_remove(struct i2c_client *i2c) 663 { 664 struct wm8994 *wm8994 = i2c_get_clientdata(i2c); 665 666 wm8994_device_exit(wm8994); 667 668 return 0; 669 } 670 671 static const struct i2c_device_id wm8994_i2c_id[] = { 672 { "wm1811", WM1811 }, 673 { "wm1811a", WM1811 }, 674 { "wm8994", WM8994 }, 675 { "wm8958", WM8958 }, 676 { } 677 }; 678 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id); 679 680 static const struct dev_pm_ops wm8994_pm_ops = { 681 SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL) 682 }; 683 684 static struct i2c_driver wm8994_i2c_driver = { 685 .driver = { 686 .name = "wm8994", 687 .pm = &wm8994_pm_ops, 688 .of_match_table = of_match_ptr(wm8994_of_match), 689 }, 690 .probe = wm8994_i2c_probe, 691 .remove = wm8994_i2c_remove, 692 .id_table = wm8994_i2c_id, 693 }; 694 695 module_i2c_driver(wm8994_i2c_driver); 696 697 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC"); 698 MODULE_LICENSE("GPL"); 699 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 700