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 struct mfd_cell wm8994_regulator_devs[] = { 37 { 38 .name = "wm8994-ldo", 39 .id = 1, 40 .pm_runtime_no_callbacks = true, 41 }, 42 { 43 .name = "wm8994-ldo", 44 .id = 2, 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 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_RUNTIME 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_default wm8994_revc_patch[] = { 247 { 0x102, 0x3 }, 248 { 0x56, 0x3 }, 249 { 0x817, 0x0 }, 250 { 0x102, 0x0 }, 251 }; 252 253 static const struct reg_default wm8958_reva_patch[] = { 254 { 0x102, 0x3 }, 255 { 0xcb, 0x81 }, 256 { 0x817, 0x0 }, 257 { 0x102, 0x0 }, 258 }; 259 260 static const struct reg_default 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_default *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, -1, 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_kzalloc(wm8994->dev, 372 sizeof(struct regulator_bulk_data) * 373 wm8994->num_supplies, GFP_KERNEL); 374 if (!wm8994->supplies) { 375 ret = -ENOMEM; 376 goto err; 377 } 378 379 switch (wm8994->type) { 380 case WM1811: 381 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++) 382 wm8994->supplies[i].supply = wm1811_main_supplies[i]; 383 break; 384 case WM8994: 385 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++) 386 wm8994->supplies[i].supply = wm8994_main_supplies[i]; 387 break; 388 case WM8958: 389 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++) 390 wm8994->supplies[i].supply = wm8958_main_supplies[i]; 391 break; 392 default: 393 BUG(); 394 goto err; 395 } 396 397 ret = devm_regulator_bulk_get(wm8994->dev, wm8994->num_supplies, 398 wm8994->supplies); 399 if (ret != 0) { 400 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret); 401 goto err; 402 } 403 404 ret = regulator_bulk_enable(wm8994->num_supplies, 405 wm8994->supplies); 406 if (ret != 0) { 407 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret); 408 goto err; 409 } 410 411 ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET); 412 if (ret < 0) { 413 dev_err(wm8994->dev, "Failed to read ID register\n"); 414 goto err_enable; 415 } 416 switch (ret) { 417 case 0x1811: 418 devname = "WM1811"; 419 if (wm8994->type != WM1811) 420 dev_warn(wm8994->dev, "Device registered as type %d\n", 421 wm8994->type); 422 wm8994->type = WM1811; 423 break; 424 case 0x8994: 425 devname = "WM8994"; 426 if (wm8994->type != WM8994) 427 dev_warn(wm8994->dev, "Device registered as type %d\n", 428 wm8994->type); 429 wm8994->type = WM8994; 430 break; 431 case 0x8958: 432 devname = "WM8958"; 433 if (wm8994->type != WM8958) 434 dev_warn(wm8994->dev, "Device registered as type %d\n", 435 wm8994->type); 436 wm8994->type = WM8958; 437 break; 438 default: 439 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n", 440 ret); 441 ret = -EINVAL; 442 goto err_enable; 443 } 444 445 ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION); 446 if (ret < 0) { 447 dev_err(wm8994->dev, "Failed to read revision register: %d\n", 448 ret); 449 goto err_enable; 450 } 451 wm8994->revision = ret & WM8994_CHIP_REV_MASK; 452 wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT; 453 454 switch (wm8994->type) { 455 case WM8994: 456 switch (wm8994->revision) { 457 case 0: 458 case 1: 459 dev_warn(wm8994->dev, 460 "revision %c not fully supported\n", 461 'A' + wm8994->revision); 462 break; 463 case 2: 464 case 3: 465 default: 466 regmap_patch = wm8994_revc_patch; 467 patch_regs = ARRAY_SIZE(wm8994_revc_patch); 468 break; 469 } 470 break; 471 472 case WM8958: 473 switch (wm8994->revision) { 474 case 0: 475 regmap_patch = wm8958_reva_patch; 476 patch_regs = ARRAY_SIZE(wm8958_reva_patch); 477 break; 478 default: 479 break; 480 } 481 break; 482 483 case WM1811: 484 /* Revision C did not change the relevant layer */ 485 if (wm8994->revision > 1) 486 wm8994->revision++; 487 488 regmap_patch = wm1811_reva_patch; 489 patch_regs = ARRAY_SIZE(wm1811_reva_patch); 490 break; 491 492 default: 493 break; 494 } 495 496 dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname, 497 'A' + wm8994->revision, wm8994->cust_id); 498 499 switch (wm8994->type) { 500 case WM1811: 501 regmap_config = &wm1811_regmap_config; 502 break; 503 case WM8994: 504 regmap_config = &wm8994_regmap_config; 505 break; 506 case WM8958: 507 regmap_config = &wm8958_regmap_config; 508 break; 509 default: 510 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type); 511 return -EINVAL; 512 } 513 514 ret = regmap_reinit_cache(wm8994->regmap, regmap_config); 515 if (ret != 0) { 516 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n", 517 ret); 518 return ret; 519 } 520 521 /* Explicitly put the device into reset in case regulators 522 * don't get disabled in order to ensure we know the device 523 * state. 524 */ 525 ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 526 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET)); 527 if (ret != 0) { 528 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret); 529 return ret; 530 } 531 532 if (regmap_patch) { 533 ret = regmap_register_patch(wm8994->regmap, regmap_patch, 534 patch_regs); 535 if (ret != 0) { 536 dev_err(wm8994->dev, "Failed to register patch: %d\n", 537 ret); 538 goto err; 539 } 540 } 541 542 wm8994->irq_base = pdata->irq_base; 543 wm8994->gpio_base = pdata->gpio_base; 544 545 /* GPIO configuration is only applied if it's non-zero */ 546 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { 547 if (pdata->gpio_defaults[i]) { 548 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i, 549 0xffff, pdata->gpio_defaults[i]); 550 } 551 } 552 553 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven; 554 555 if (pdata->spkmode_pu) 556 pulls |= WM8994_SPKMODE_PU; 557 558 /* Disable unneeded pulls */ 559 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 560 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD | 561 WM8994_SPKMODE_PU | WM8994_CSNADDR_PD, 562 pulls); 563 564 /* In some system designs where the regulators are not in use, 565 * we can achieve a small reduction in leakage currents by 566 * floating LDO outputs. This bit makes no difference if the 567 * LDOs are enabled, it only affects cases where the LDOs were 568 * in operation and are then disabled. 569 */ 570 for (i = 0; i < WM8994_NUM_LDO_REGS; i++) { 571 if (wm8994_ldo_in_use(pdata, i)) 572 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 573 WM8994_LDO1_DISCH, WM8994_LDO1_DISCH); 574 else 575 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 576 WM8994_LDO1_DISCH, 0); 577 } 578 579 wm8994_irq_init(wm8994); 580 581 ret = mfd_add_devices(wm8994->dev, -1, 582 wm8994_devs, ARRAY_SIZE(wm8994_devs), 583 NULL, 0, NULL); 584 if (ret != 0) { 585 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 586 goto err_irq; 587 } 588 589 pm_runtime_enable(wm8994->dev); 590 pm_runtime_idle(wm8994->dev); 591 592 return 0; 593 594 err_irq: 595 wm8994_irq_exit(wm8994); 596 err_enable: 597 regulator_bulk_disable(wm8994->num_supplies, 598 wm8994->supplies); 599 err: 600 mfd_remove_devices(wm8994->dev); 601 return ret; 602 } 603 604 static void wm8994_device_exit(struct wm8994 *wm8994) 605 { 606 pm_runtime_disable(wm8994->dev); 607 mfd_remove_devices(wm8994->dev); 608 wm8994_irq_exit(wm8994); 609 regulator_bulk_disable(wm8994->num_supplies, 610 wm8994->supplies); 611 } 612 613 static const struct of_device_id wm8994_of_match[] = { 614 { .compatible = "wlf,wm1811", .data = (void *)WM1811 }, 615 { .compatible = "wlf,wm8994", .data = (void *)WM8994 }, 616 { .compatible = "wlf,wm8958", .data = (void *)WM8958 }, 617 { } 618 }; 619 MODULE_DEVICE_TABLE(of, wm8994_of_match); 620 621 static int wm8994_i2c_probe(struct i2c_client *i2c, 622 const struct i2c_device_id *id) 623 { 624 const struct of_device_id *of_id; 625 struct wm8994 *wm8994; 626 int ret; 627 628 wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL); 629 if (wm8994 == NULL) 630 return -ENOMEM; 631 632 i2c_set_clientdata(i2c, wm8994); 633 wm8994->dev = &i2c->dev; 634 wm8994->irq = i2c->irq; 635 636 if (i2c->dev.of_node) { 637 of_id = of_match_device(wm8994_of_match, &i2c->dev); 638 if (of_id) 639 wm8994->type = (int)of_id->data; 640 } else { 641 wm8994->type = id->driver_data; 642 } 643 644 wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config); 645 if (IS_ERR(wm8994->regmap)) { 646 ret = PTR_ERR(wm8994->regmap); 647 dev_err(wm8994->dev, "Failed to allocate register map: %d\n", 648 ret); 649 return ret; 650 } 651 652 return wm8994_device_init(wm8994, i2c->irq); 653 } 654 655 static int wm8994_i2c_remove(struct i2c_client *i2c) 656 { 657 struct wm8994 *wm8994 = i2c_get_clientdata(i2c); 658 659 wm8994_device_exit(wm8994); 660 661 return 0; 662 } 663 664 static const struct i2c_device_id wm8994_i2c_id[] = { 665 { "wm1811", WM1811 }, 666 { "wm1811a", WM1811 }, 667 { "wm8994", WM8994 }, 668 { "wm8958", WM8958 }, 669 { } 670 }; 671 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id); 672 673 static const struct dev_pm_ops wm8994_pm_ops = { 674 SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL) 675 }; 676 677 static struct i2c_driver wm8994_i2c_driver = { 678 .driver = { 679 .name = "wm8994", 680 .owner = THIS_MODULE, 681 .pm = &wm8994_pm_ops, 682 .of_match_table = of_match_ptr(wm8994_of_match), 683 }, 684 .probe = wm8994_i2c_probe, 685 .remove = wm8994_i2c_remove, 686 .id_table = wm8994_i2c_id, 687 }; 688 689 module_i2c_driver(wm8994_i2c_driver); 690 691 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC"); 692 MODULE_LICENSE("GPL"); 693 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 694