drivers/mfd/arizona-core.c

   1 /*
   2  * Arizona core driver
   3  *
   4  * Copyright 2012 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
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/err.h>
  15 #include <linux/gpio.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/module.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/regmap.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <linux/slab.h>
  23
  24 #include <linux/mfd/arizona/core.h>
  25 #include <linux/mfd/arizona/registers.h>
  26
  27 #include "arizona.h"
  28
  29 static const char *wm5102_core_supplies[] = {
  30         "AVDD",
  31         "DBVDD1",
  32 };
  33
  34 int arizona_clk32k_enable(struct arizona *arizona)
  35 {
  36         int ret = 0;
  37
  38         mutex_lock(&arizona->clk_lock);
  39
  40         arizona->clk32k_ref++;
  41
  42         if (arizona->clk32k_ref == 1)
  43                 ret = regmap_update_bits(arizona->regmap, ARIZONA_CLOCK_32K_1,
  44                                          ARIZONA_CLK_32K_ENA,
  45                                          ARIZONA_CLK_32K_ENA);
  46
  47         if (ret != 0)
  48                 arizona->clk32k_ref--;
  49
  50         mutex_unlock(&arizona->clk_lock);
  51
  52         return ret;
  53 }
  54 EXPORT_SYMBOL_GPL(arizona_clk32k_enable);
  55
  56 int arizona_clk32k_disable(struct arizona *arizona)
  57 {
  58         int ret = 0;
  59
  60         mutex_lock(&arizona->clk_lock);
  61
  62         BUG_ON(arizona->clk32k_ref <= 0);
  63
  64         arizona->clk32k_ref--;
  65
  66         if (arizona->clk32k_ref == 0)
  67                 regmap_update_bits(arizona->regmap, ARIZONA_CLOCK_32K_1,
  68                                    ARIZONA_CLK_32K_ENA, 0);
  69
  70         mutex_unlock(&arizona->clk_lock);
  71
  72         return ret;
  73 }
  74 EXPORT_SYMBOL_GPL(arizona_clk32k_disable);
  75
  76 static irqreturn_t arizona_clkgen_err(int irq, void *data)
  77 {
  78         struct arizona *arizona = data;
  79
  80         dev_err(arizona->dev, "CLKGEN error\n");
  81
  82         return IRQ_HANDLED;
  83 }
  84
  85 static irqreturn_t arizona_underclocked(int irq, void *data)
  86 {
  87         struct arizona *arizona = data;
  88         unsigned int val;
  89         int ret;
  90
  91         ret = regmap_read(arizona->regmap, ARIZONA_INTERRUPT_RAW_STATUS_8,
  92                           &val);
  93         if (ret != 0) {
  94                 dev_err(arizona->dev, "Failed to read underclock status: %d\n",
  95                         ret);
  96                 return IRQ_NONE;
  97         }
  98
  99         if (val & ARIZONA_AIF3_UNDERCLOCKED_STS)
 100                 dev_err(arizona->dev, "AIF3 underclocked\n");
 101         if (val & ARIZONA_AIF2_UNDERCLOCKED_STS)
 102                 dev_err(arizona->dev, "AIF2 underclocked\n");
 103         if (val & ARIZONA_AIF1_UNDERCLOCKED_STS)
 104                 dev_err(arizona->dev, "AIF1 underclocked\n");
 105         if (val & ARIZONA_ISRC2_UNDERCLOCKED_STS)
 106                 dev_err(arizona->dev, "ISRC2 underclocked\n");
 107         if (val & ARIZONA_ISRC1_UNDERCLOCKED_STS)
 108                 dev_err(arizona->dev, "ISRC1 underclocked\n");
 109         if (val & ARIZONA_FX_UNDERCLOCKED_STS)
 110                 dev_err(arizona->dev, "FX underclocked\n");
 111         if (val & ARIZONA_ASRC_UNDERCLOCKED_STS)
 112                 dev_err(arizona->dev, "ASRC underclocked\n");
 113         if (val & ARIZONA_DAC_UNDERCLOCKED_STS)
 114                 dev_err(arizona->dev, "DAC underclocked\n");
 115         if (val & ARIZONA_ADC_UNDERCLOCKED_STS)
 116                 dev_err(arizona->dev, "ADC underclocked\n");
 117         if (val & ARIZONA_MIXER_UNDERCLOCKED_STS)
 118                 dev_err(arizona->dev, "Mixer underclocked\n");
 119
 120         return IRQ_HANDLED;
 121 }
 122
 123 static irqreturn_t arizona_overclocked(int irq, void *data)
 124 {
 125         struct arizona *arizona = data;
 126         unsigned int val[2];
 127         int ret;
 128
 129         ret = regmap_bulk_read(arizona->regmap, ARIZONA_INTERRUPT_RAW_STATUS_6,
 130                                &val[0], 2);
 131         if (ret != 0) {
 132                 dev_err(arizona->dev, "Failed to read overclock status: %d\n",
 133                         ret);
 134                 return IRQ_NONE;
 135         }
 136
 137         if (val[0] & ARIZONA_PWM_OVERCLOCKED_STS)
 138                 dev_err(arizona->dev, "PWM overclocked\n");
 139         if (val[0] & ARIZONA_FX_CORE_OVERCLOCKED_STS)
 140                 dev_err(arizona->dev, "FX core overclocked\n");
 141         if (val[0] & ARIZONA_DAC_SYS_OVERCLOCKED_STS)
 142                 dev_err(arizona->dev, "DAC SYS overclocked\n");
 143         if (val[0] & ARIZONA_DAC_WARP_OVERCLOCKED_STS)
 144                 dev_err(arizona->dev, "DAC WARP overclocked\n");
 145         if (val[0] & ARIZONA_ADC_OVERCLOCKED_STS)
 146                 dev_err(arizona->dev, "ADC overclocked\n");
 147         if (val[0] & ARIZONA_MIXER_OVERCLOCKED_STS)
 148                 dev_err(arizona->dev, "Mixer overclocked\n");
 149         if (val[0] & ARIZONA_AIF3_SYNC_OVERCLOCKED_STS)
 150                 dev_err(arizona->dev, "AIF3 overclocked\n");
 151         if (val[0] & ARIZONA_AIF2_SYNC_OVERCLOCKED_STS)
 152                 dev_err(arizona->dev, "AIF2 overclocked\n");
 153         if (val[0] & ARIZONA_AIF1_SYNC_OVERCLOCKED_STS)
 154                 dev_err(arizona->dev, "AIF1 overclocked\n");
 155         if (val[0] & ARIZONA_PAD_CTRL_OVERCLOCKED_STS)
 156                 dev_err(arizona->dev, "Pad control overclocked\n");
 157
 158         if (val[1] & ARIZONA_SLIMBUS_SUBSYS_OVERCLOCKED_STS)
 159                 dev_err(arizona->dev, "Slimbus subsystem overclocked\n");
 160         if (val[1] & ARIZONA_SLIMBUS_ASYNC_OVERCLOCKED_STS)
 161                 dev_err(arizona->dev, "Slimbus async overclocked\n");
 162         if (val[1] & ARIZONA_SLIMBUS_SYNC_OVERCLOCKED_STS)
 163                 dev_err(arizona->dev, "Slimbus sync overclocked\n");
 164         if (val[1] & ARIZONA_ASRC_ASYNC_SYS_OVERCLOCKED_STS)
 165                 dev_err(arizona->dev, "ASRC async system overclocked\n");
 166         if (val[1] & ARIZONA_ASRC_ASYNC_WARP_OVERCLOCKED_STS)
 167                 dev_err(arizona->dev, "ASRC async WARP overclocked\n");
 168         if (val[1] & ARIZONA_ASRC_SYNC_SYS_OVERCLOCKED_STS)
 169                 dev_err(arizona->dev, "ASRC sync system overclocked\n");
 170         if (val[1] & ARIZONA_ASRC_SYNC_WARP_OVERCLOCKED_STS)
 171                 dev_err(arizona->dev, "ASRC sync WARP overclocked\n");
 172         if (val[1] & ARIZONA_ADSP2_1_OVERCLOCKED_STS)
 173                 dev_err(arizona->dev, "DSP1 overclocked\n");
 174         if (val[1] & ARIZONA_ISRC2_OVERCLOCKED_STS)
 175                 dev_err(arizona->dev, "ISRC2 overclocked\n");
 176         if (val[1] & ARIZONA_ISRC1_OVERCLOCKED_STS)
 177                 dev_err(arizona->dev, "ISRC1 overclocked\n");
 178
 179         return IRQ_HANDLED;
 180 }
 181
 182 static int arizona_wait_for_boot(struct arizona *arizona)
 183 {
 184         unsigned int reg;
 185         int ret, i;
 186
 187         /*
 188          * We can't use an interrupt as we need to runtime resume to do so,
 189          * we won't race with the interrupt handler as it'll be blocked on
 190          * runtime resume.
 191          */
 192         for (i = 0; i < 5; i++) {
 193                 msleep(1);
 194
 195                 ret = regmap_read(arizona->regmap,
 196                                   ARIZONA_INTERRUPT_RAW_STATUS_5, &reg);
 197                 if (ret != 0) {
 198                         dev_err(arizona->dev, "Failed to read boot state: %d\n",
 199                                 ret);
 200                         continue;
 201                 }
 202
 203                 if (reg & ARIZONA_BOOT_DONE_STS)
 204                         break;
 205         }
 206
 207         if (reg & ARIZONA_BOOT_DONE_STS) {
 208                 regmap_write(arizona->regmap, ARIZONA_INTERRUPT_STATUS_5,
 209                              ARIZONA_BOOT_DONE_STS);
 210         } else {
 211                 dev_err(arizona->dev, "Device boot timed out: %x\n", reg);
 212                 return -ETIMEDOUT;
 213         }
 214
 215         pm_runtime_mark_last_busy(arizona->dev);
 216
 217         return 0;
 218 }
 219
 220 #ifdef CONFIG_PM_RUNTIME
 221 static int arizona_runtime_resume(struct device *dev)
 222 {
 223         struct arizona *arizona = dev_get_drvdata(dev);
 224         int ret;
 225
 226         dev_dbg(arizona->dev, "Leaving AoD mode\n");
 227
 228         ret = regulator_enable(arizona->dcvdd);
 229         if (ret != 0) {
 230                 dev_err(arizona->dev, "Failed to enable DCVDD: %d\n", ret);
 231                 return ret;
 232         }
 233
 234         regcache_cache_only(arizona->regmap, false);
 235
 236         ret = arizona_wait_for_boot(arizona);
 237         if (ret != 0) {
 238                 regulator_disable(arizona->dcvdd);
 239                 return ret;
 240         }
 241
 242         regcache_sync(arizona->regmap);
 243
 244         return 0;
 245 }
 246
 247 static int arizona_runtime_suspend(struct device *dev)
 248 {
 249         struct arizona *arizona = dev_get_drvdata(dev);
 250
 251         dev_dbg(arizona->dev, "Entering AoD mode\n");
 252
 253         regulator_disable(arizona->dcvdd);
 254         regcache_cache_only(arizona->regmap, true);
 255         regcache_mark_dirty(arizona->regmap);
 256
 257         return 0;
 258 }
 259 #endif
 260
 261 const struct dev_pm_ops arizona_pm_ops = {
 262         SET_RUNTIME_PM_OPS(arizona_runtime_suspend,
 263                            arizona_runtime_resume,
 264                            NULL)
 265 };
 266 EXPORT_SYMBOL_GPL(arizona_pm_ops);
 267
 268 static struct mfd_cell early_devs[] = {
 269         { .name = "arizona-ldo1" },
 270 };
 271
 272 static struct mfd_cell wm5102_devs[] = {
 273         { .name = "arizona-extcon" },
 274         { .name = "arizona-gpio" },
 275         { .name = "arizona-micsupp" },
 276         { .name = "arizona-pwm" },
 277         { .name = "wm5102-codec" },
 278 };
 279
 280 static struct mfd_cell wm5110_devs[] = {
 281         { .name = "arizona-extcon" },
 282         { .name = "arizona-gpio" },
 283         { .name = "arizona-micsupp" },
 284         { .name = "arizona-pwm" },
 285         { .name = "wm5110-codec" },
 286 };
 287
 288 int arizona_dev_init(struct arizona *arizona)
 289 {
 290         struct device *dev = arizona->dev;
 291         const char *type_name;
 292         unsigned int reg, val;
 293         int ret, i;
 294
 295         dev_set_drvdata(arizona->dev, arizona);
 296         mutex_init(&arizona->clk_lock);
 297
 298         if (dev_get_platdata(arizona->dev))
 299                 memcpy(&arizona->pdata, dev_get_platdata(arizona->dev),
 300                        sizeof(arizona->pdata));
 301
 302         regcache_cache_only(arizona->regmap, true);
 303
 304         switch (arizona->type) {
 305         case WM5102:
 306         case WM5110:
 307                 for (i = 0; i < ARRAY_SIZE(wm5102_core_supplies); i++)
 308                         arizona->core_supplies[i].supply
 309                                 = wm5102_core_supplies[i];
 310                 arizona->num_core_supplies = ARRAY_SIZE(wm5102_core_supplies);
 311                 break;
 312         default:
 313                 dev_err(arizona->dev, "Unknown device type %d\n",
 314                         arizona->type);
 315                 return -EINVAL;
 316         }
 317
 318         ret = mfd_add_devices(arizona->dev, -1, early_devs,
 319                               ARRAY_SIZE(early_devs), NULL, 0, NULL);
 320         if (ret != 0) {
 321                 dev_err(dev, "Failed to add early children: %d\n", ret);
 322                 return ret;
 323         }
 324
 325         ret = devm_regulator_bulk_get(dev, arizona->num_core_supplies,
 326                                       arizona->core_supplies);
 327         if (ret != 0) {
 328                 dev_err(dev, "Failed to request core supplies: %d\n",
 329                         ret);
 330                 goto err_early;
 331         }
 332
 333         arizona->dcvdd = devm_regulator_get(arizona->dev, "DCVDD");
 334         if (IS_ERR(arizona->dcvdd)) {
 335                 ret = PTR_ERR(arizona->dcvdd);
 336                 dev_err(dev, "Failed to request DCVDD: %d\n", ret);
 337                 goto err_early;
 338         }
 339
 340         ret = regulator_bulk_enable(arizona->num_core_supplies,
 341                                     arizona->core_supplies);
 342         if (ret != 0) {
 343                 dev_err(dev, "Failed to enable core supplies: %d\n",
 344                         ret);
 345                 goto err_early;
 346         }
 347
 348         ret = regulator_enable(arizona->dcvdd);
 349         if (ret != 0) {
 350                 dev_err(dev, "Failed to enable DCVDD: %d\n", ret);
 351                 goto err_enable;
 352         }
 353
 354         if (arizona->pdata.reset) {
 355                 /* Start out with /RESET low to put the chip into reset */
 356                 ret = gpio_request_one(arizona->pdata.reset,
 357                                        GPIOF_DIR_OUT | GPIOF_INIT_LOW,
 358                                        "arizona /RESET");
 359                 if (ret != 0) {
 360                         dev_err(dev, "Failed to request /RESET: %d\n", ret);
 361                         goto err_dcvdd;
 362                 }
 363
 364                 gpio_set_value_cansleep(arizona->pdata.reset, 1);
 365         }
 366
 367         regcache_cache_only(arizona->regmap, false);
 368
 369         ret = regmap_read(arizona->regmap, ARIZONA_SOFTWARE_RESET, &reg);
 370         if (ret != 0) {
 371                 dev_err(dev, "Failed to read ID register: %d\n", ret);
 372                 goto err_reset;
 373         }
 374
 375         ret = regmap_read(arizona->regmap, ARIZONA_DEVICE_REVISION,
 376                           &arizona->rev);
 377         if (ret != 0) {
 378                 dev_err(dev, "Failed to read revision register: %d\n", ret);
 379                 goto err_reset;
 380         }
 381         arizona->rev &= ARIZONA_DEVICE_REVISION_MASK;
 382
 383         switch (reg) {
 384 #ifdef CONFIG_MFD_WM5102
 385         case 0x5102:
 386                 type_name = "WM5102";
 387                 if (arizona->type != WM5102) {
 388                         dev_err(arizona->dev, "WM5102 registered as %d\n",
 389                                 arizona->type);
 390                         arizona->type = WM5102;
 391                 }
 392                 ret = wm5102_patch(arizona);
 393                 break;
 394 #endif
 395 #ifdef CONFIG_MFD_WM5110
 396         case 0x5110:
 397                 type_name = "WM5110";
 398                 if (arizona->type != WM5110) {
 399                         dev_err(arizona->dev, "WM5110 registered as %d\n",
 400                                 arizona->type);
 401                         arizona->type = WM5110;
 402                 }
 403                 ret = wm5110_patch(arizona);
 404                 break;
 405 #endif
 406         default:
 407                 dev_err(arizona->dev, "Unknown device ID %x\n", reg);
 408                 goto err_reset;
 409         }
 410
 411         dev_info(dev, "%s revision %c\n", type_name, arizona->rev + 'A');
 412
 413         if (ret != 0)
 414                 dev_err(arizona->dev, "Failed to apply patch: %d\n", ret);
 415
 416         /* If we have a /RESET GPIO we'll already be reset */
 417         if (!arizona->pdata.reset) {
 418                 regcache_mark_dirty(arizona->regmap);
 419
 420                 ret = regmap_write(arizona->regmap, ARIZONA_SOFTWARE_RESET, 0);
 421                 if (ret != 0) {
 422                         dev_err(dev, "Failed to reset device: %d\n", ret);
 423                         goto err_reset;
 424                 }
 425
 426                 ret = regcache_sync(arizona->regmap);
 427                 if (ret != 0) {
 428                         dev_err(dev, "Failed to sync device: %d\n", ret);
 429                         goto err_reset;
 430                 }
 431         }
 432
 433         ret = arizona_wait_for_boot(arizona);
 434         if (ret != 0) {
 435                 dev_err(arizona->dev, "Device failed initial boot: %d\n", ret);
 436                 goto err_reset;
 437         }
 438
 439         for (i = 0; i < ARRAY_SIZE(arizona->pdata.gpio_defaults); i++) {
 440                 if (!arizona->pdata.gpio_defaults[i])
 441                         continue;
 442
 443                 regmap_write(arizona->regmap, ARIZONA_GPIO1_CTRL + i,
 444                              arizona->pdata.gpio_defaults[i]);
 445         }
 446
 447         pm_runtime_set_autosuspend_delay(arizona->dev, 100);
 448         pm_runtime_use_autosuspend(arizona->dev);
 449         pm_runtime_enable(arizona->dev);
 450
 451         /* Chip default */
 452         if (!arizona->pdata.clk32k_src)
 453                 arizona->pdata.clk32k_src = ARIZONA_32KZ_MCLK2;
 454
 455         switch (arizona->pdata.clk32k_src) {
 456         case ARIZONA_32KZ_MCLK1:
 457         case ARIZONA_32KZ_MCLK2:
 458                 regmap_update_bits(arizona->regmap, ARIZONA_CLOCK_32K_1,
 459                                    ARIZONA_CLK_32K_SRC_MASK,
 460                                    arizona->pdata.clk32k_src - 1);
 461                 break;
 462         case ARIZONA_32KZ_NONE:
 463                 regmap_update_bits(arizona->regmap, ARIZONA_CLOCK_32K_1,
 464                                    ARIZONA_CLK_32K_SRC_MASK, 2);
 465                 break;
 466         default:
 467                 dev_err(arizona->dev, "Invalid 32kHz clock source: %d\n",
 468                         arizona->pdata.clk32k_src);
 469                 ret = -EINVAL;
 470                 goto err_reset;
 471         }
 472
 473         for (i = 0; i < ARIZONA_MAX_INPUT; i++) {
 474                 /* Default for both is 0 so noop with defaults */
 475                 val = arizona->pdata.dmic_ref[i]
 476                         << ARIZONA_IN1_DMIC_SUP_SHIFT;
 477                 val |= arizona->pdata.inmode[i] << ARIZONA_IN1_MODE_SHIFT;
 478
 479                 regmap_update_bits(arizona->regmap,
 480                                    ARIZONA_IN1L_CONTROL + (i * 8),
 481                                    ARIZONA_IN1_DMIC_SUP_MASK |
 482                                    ARIZONA_IN1_MODE_MASK, val);
 483         }
 484
 485         for (i = 0; i < ARIZONA_MAX_OUTPUT; i++) {
 486                 /* Default is 0 so noop with defaults */
 487                 if (arizona->pdata.out_mono[i])
 488                         val = ARIZONA_OUT1_MONO;
 489                 else
 490                         val = 0;
 491
 492                 regmap_update_bits(arizona->regmap,
 493                                    ARIZONA_OUTPUT_PATH_CONFIG_1L + (i * 8),
 494                                    ARIZONA_OUT1_MONO, val);
 495         }
 496
 497         for (i = 0; i < ARIZONA_MAX_PDM_SPK; i++) {
 498                 if (arizona->pdata.spk_mute[i])
 499                         regmap_update_bits(arizona->regmap,
 500                                            ARIZONA_PDM_SPK1_CTRL_1 + (i * 2),
 501                                            ARIZONA_SPK1_MUTE_ENDIAN_MASK |
 502                                            ARIZONA_SPK1_MUTE_SEQ1_MASK,
 503                                            arizona->pdata.spk_mute[i]);
 504
 505                 if (arizona->pdata.spk_fmt[i])
 506                         regmap_update_bits(arizona->regmap,
 507                                            ARIZONA_PDM_SPK1_CTRL_2 + (i * 2),
 508                                            ARIZONA_SPK1_FMT_MASK,
 509                                            arizona->pdata.spk_fmt[i]);
 510         }
 511
 512         /* Set up for interrupts */
 513         ret = arizona_irq_init(arizona);
 514         if (ret != 0)
 515                 goto err_reset;
 516
 517         arizona_request_irq(arizona, ARIZONA_IRQ_CLKGEN_ERR, "CLKGEN error",
 518                             arizona_clkgen_err, arizona);
 519         arizona_request_irq(arizona, ARIZONA_IRQ_OVERCLOCKED, "Overclocked",
 520                             arizona_overclocked, arizona);
 521         arizona_request_irq(arizona, ARIZONA_IRQ_UNDERCLOCKED, "Underclocked",
 522                             arizona_underclocked, arizona);
 523
 524         switch (arizona->type) {
 525         case WM5102:
 526                 ret = mfd_add_devices(arizona->dev, -1, wm5102_devs,
 527                                       ARRAY_SIZE(wm5102_devs), NULL, 0, NULL);
 528                 break;
 529         case WM5110:
 530                 ret = mfd_add_devices(arizona->dev, -1, wm5110_devs,
 531                                       ARRAY_SIZE(wm5110_devs), NULL, 0, NULL);
 532                 break;
 533         }
 534
 535         if (ret != 0) {
 536                 dev_err(arizona->dev, "Failed to add subdevices: %d\n", ret);
 537                 goto err_irq;
 538         }
 539
 540 #ifdef CONFIG_PM_RUNTIME
 541         regulator_disable(arizona->dcvdd);
 542 #endif
 543
 544         return 0;
 545
 546 err_irq:
 547         arizona_irq_exit(arizona);
 548 err_reset:
 549         if (arizona->pdata.reset) {
 550                 gpio_set_value_cansleep(arizona->pdata.reset, 1);
 551                 gpio_free(arizona->pdata.reset);
 552         }
 553 err_dcvdd:
 554         regulator_disable(arizona->dcvdd);
 555 err_enable:
 556         regulator_bulk_disable(arizona->num_core_supplies,
 557                                arizona->core_supplies);
 558 err_early:
 559         mfd_remove_devices(dev);
 560         return ret;
 561 }
 562 EXPORT_SYMBOL_GPL(arizona_dev_init);
 563
 564 int arizona_dev_exit(struct arizona *arizona)
 565 {
 566         mfd_remove_devices(arizona->dev);
 567         arizona_free_irq(arizona, ARIZONA_IRQ_UNDERCLOCKED, arizona);
 568         arizona_free_irq(arizona, ARIZONA_IRQ_OVERCLOCKED, arizona);
 569         arizona_free_irq(arizona, ARIZONA_IRQ_CLKGEN_ERR, arizona);
 570         pm_runtime_disable(arizona->dev);
 571         arizona_irq_exit(arizona);
 572         return 0;
 573 }
 574 EXPORT_SYMBOL_GPL(arizona_dev_exit);