drivers/mfd/wm8350-irq.c

   1 /*
   2  * wm8350-irq.c  --  IRQ support for Wolfson WM8350
   3  *
   4  * Copyright 2007, 2008, 2009 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Liam Girdwood, Mark Brown
   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/bug.h>
  18 #include <linux/device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/irq.h>
  21
  22 #include <linux/mfd/wm8350/core.h>
  23 #include <linux/mfd/wm8350/audio.h>
  24 #include <linux/mfd/wm8350/comparator.h>
  25 #include <linux/mfd/wm8350/gpio.h>
  26 #include <linux/mfd/wm8350/pmic.h>
  27 #include <linux/mfd/wm8350/rtc.h>
  28 #include <linux/mfd/wm8350/supply.h>
  29 #include <linux/mfd/wm8350/wdt.h>
  30
  31 #define WM8350_INT_OFFSET_1                     0
  32 #define WM8350_INT_OFFSET_2                     1
  33 #define WM8350_POWER_UP_INT_OFFSET              2
  34 #define WM8350_UNDER_VOLTAGE_INT_OFFSET         3
  35 #define WM8350_OVER_CURRENT_INT_OFFSET          4
  36 #define WM8350_GPIO_INT_OFFSET                  5
  37 #define WM8350_COMPARATOR_INT_OFFSET            6
  38
  39 struct wm8350_irq_data {
  40         int primary;
  41         int reg;
  42         int mask;
  43         int primary_only;
  44 };
  45
  46 static struct wm8350_irq_data wm8350_irqs[] = {
  47         [WM8350_IRQ_OC_LS] = {
  48                 .primary = WM8350_OC_INT,
  49                 .reg = WM8350_OVER_CURRENT_INT_OFFSET,
  50                 .mask = WM8350_OC_LS_EINT,
  51                 .primary_only = 1,
  52         },
  53         [WM8350_IRQ_UV_DC1] = {
  54                 .primary = WM8350_UV_INT,
  55                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  56                 .mask = WM8350_UV_DC1_EINT,
  57         },
  58         [WM8350_IRQ_UV_DC2] = {
  59                 .primary = WM8350_UV_INT,
  60                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  61                 .mask = WM8350_UV_DC2_EINT,
  62         },
  63         [WM8350_IRQ_UV_DC3] = {
  64                 .primary = WM8350_UV_INT,
  65                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  66                 .mask = WM8350_UV_DC3_EINT,
  67         },
  68         [WM8350_IRQ_UV_DC4] = {
  69                 .primary = WM8350_UV_INT,
  70                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  71                 .mask = WM8350_UV_DC4_EINT,
  72         },
  73         [WM8350_IRQ_UV_DC5] = {
  74                 .primary = WM8350_UV_INT,
  75                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  76                 .mask = WM8350_UV_DC5_EINT,
  77         },
  78         [WM8350_IRQ_UV_DC6] = {
  79                 .primary = WM8350_UV_INT,
  80                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  81                 .mask = WM8350_UV_DC6_EINT,
  82         },
  83         [WM8350_IRQ_UV_LDO1] = {
  84                 .primary = WM8350_UV_INT,
  85                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  86                 .mask = WM8350_UV_LDO1_EINT,
  87         },
  88         [WM8350_IRQ_UV_LDO2] = {
  89                 .primary = WM8350_UV_INT,
  90                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  91                 .mask = WM8350_UV_LDO2_EINT,
  92         },
  93         [WM8350_IRQ_UV_LDO3] = {
  94                 .primary = WM8350_UV_INT,
  95                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
  96                 .mask = WM8350_UV_LDO3_EINT,
  97         },
  98         [WM8350_IRQ_UV_LDO4] = {
  99                 .primary = WM8350_UV_INT,
 100                 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
 101                 .mask = WM8350_UV_LDO4_EINT,
 102         },
 103         [WM8350_IRQ_CHG_BAT_HOT] = {
 104                 .primary = WM8350_CHG_INT,
 105                 .reg = WM8350_INT_OFFSET_1,
 106                 .mask = WM8350_CHG_BAT_HOT_EINT,
 107         },
 108         [WM8350_IRQ_CHG_BAT_COLD] = {
 109                 .primary = WM8350_CHG_INT,
 110                 .reg = WM8350_INT_OFFSET_1,
 111                 .mask = WM8350_CHG_BAT_COLD_EINT,
 112         },
 113         [WM8350_IRQ_CHG_BAT_FAIL] = {
 114                 .primary = WM8350_CHG_INT,
 115                 .reg = WM8350_INT_OFFSET_1,
 116                 .mask = WM8350_CHG_BAT_FAIL_EINT,
 117         },
 118         [WM8350_IRQ_CHG_TO] = {
 119                 .primary = WM8350_CHG_INT,
 120                 .reg = WM8350_INT_OFFSET_1,
 121                 .mask = WM8350_CHG_TO_EINT,
 122         },
 123         [WM8350_IRQ_CHG_END] = {
 124                 .primary = WM8350_CHG_INT,
 125                 .reg = WM8350_INT_OFFSET_1,
 126                 .mask = WM8350_CHG_END_EINT,
 127         },
 128         [WM8350_IRQ_CHG_START] = {
 129                 .primary = WM8350_CHG_INT,
 130                 .reg = WM8350_INT_OFFSET_1,
 131                 .mask = WM8350_CHG_START_EINT,
 132         },
 133         [WM8350_IRQ_CHG_FAST_RDY] = {
 134                 .primary = WM8350_CHG_INT,
 135                 .reg = WM8350_INT_OFFSET_1,
 136                 .mask = WM8350_CHG_FAST_RDY_EINT,
 137         },
 138         [WM8350_IRQ_CHG_VBATT_LT_3P9] = {
 139                 .primary = WM8350_CHG_INT,
 140                 .reg = WM8350_INT_OFFSET_1,
 141                 .mask = WM8350_CHG_VBATT_LT_3P9_EINT,
 142         },
 143         [WM8350_IRQ_CHG_VBATT_LT_3P1] = {
 144                 .primary = WM8350_CHG_INT,
 145                 .reg = WM8350_INT_OFFSET_1,
 146                 .mask = WM8350_CHG_VBATT_LT_3P1_EINT,
 147         },
 148         [WM8350_IRQ_CHG_VBATT_LT_2P85] = {
 149                 .primary = WM8350_CHG_INT,
 150                 .reg = WM8350_INT_OFFSET_1,
 151                 .mask = WM8350_CHG_VBATT_LT_2P85_EINT,
 152         },
 153         [WM8350_IRQ_RTC_ALM] = {
 154                 .primary = WM8350_RTC_INT,
 155                 .reg = WM8350_INT_OFFSET_1,
 156                 .mask = WM8350_RTC_ALM_EINT,
 157         },
 158         [WM8350_IRQ_RTC_SEC] = {
 159                 .primary = WM8350_RTC_INT,
 160                 .reg = WM8350_INT_OFFSET_1,
 161                 .mask = WM8350_RTC_SEC_EINT,
 162         },
 163         [WM8350_IRQ_RTC_PER] = {
 164                 .primary = WM8350_RTC_INT,
 165                 .reg = WM8350_INT_OFFSET_1,
 166                 .mask = WM8350_RTC_PER_EINT,
 167         },
 168         [WM8350_IRQ_CS1] = {
 169                 .primary = WM8350_CS_INT,
 170                 .reg = WM8350_INT_OFFSET_2,
 171                 .mask = WM8350_CS1_EINT,
 172         },
 173         [WM8350_IRQ_CS2] = {
 174                 .primary = WM8350_CS_INT,
 175                 .reg = WM8350_INT_OFFSET_2,
 176                 .mask = WM8350_CS2_EINT,
 177         },
 178         [WM8350_IRQ_SYS_HYST_COMP_FAIL] = {
 179                 .primary = WM8350_SYS_INT,
 180                 .reg = WM8350_INT_OFFSET_2,
 181                 .mask = WM8350_SYS_HYST_COMP_FAIL_EINT,
 182         },
 183         [WM8350_IRQ_SYS_CHIP_GT115] = {
 184                 .primary = WM8350_SYS_INT,
 185                 .reg = WM8350_INT_OFFSET_2,
 186                 .mask = WM8350_SYS_CHIP_GT115_EINT,
 187         },
 188         [WM8350_IRQ_SYS_CHIP_GT140] = {
 189                 .primary = WM8350_SYS_INT,
 190                 .reg = WM8350_INT_OFFSET_2,
 191                 .mask = WM8350_SYS_CHIP_GT140_EINT,
 192         },
 193         [WM8350_IRQ_SYS_WDOG_TO] = {
 194                 .primary = WM8350_SYS_INT,
 195                 .reg = WM8350_INT_OFFSET_2,
 196                 .mask = WM8350_SYS_WDOG_TO_EINT,
 197         },
 198         [WM8350_IRQ_AUXADC_DATARDY] = {
 199                 .primary = WM8350_AUXADC_INT,
 200                 .reg = WM8350_INT_OFFSET_2,
 201                 .mask = WM8350_AUXADC_DATARDY_EINT,
 202         },
 203         [WM8350_IRQ_AUXADC_DCOMP4] = {
 204                 .primary = WM8350_AUXADC_INT,
 205                 .reg = WM8350_INT_OFFSET_2,
 206                 .mask = WM8350_AUXADC_DCOMP4_EINT,
 207         },
 208         [WM8350_IRQ_AUXADC_DCOMP3] = {
 209                 .primary = WM8350_AUXADC_INT,
 210                 .reg = WM8350_INT_OFFSET_2,
 211                 .mask = WM8350_AUXADC_DCOMP3_EINT,
 212         },
 213         [WM8350_IRQ_AUXADC_DCOMP2] = {
 214                 .primary = WM8350_AUXADC_INT,
 215                 .reg = WM8350_INT_OFFSET_2,
 216                 .mask = WM8350_AUXADC_DCOMP2_EINT,
 217         },
 218         [WM8350_IRQ_AUXADC_DCOMP1] = {
 219                 .primary = WM8350_AUXADC_INT,
 220                 .reg = WM8350_INT_OFFSET_2,
 221                 .mask = WM8350_AUXADC_DCOMP1_EINT,
 222         },
 223         [WM8350_IRQ_USB_LIMIT] = {
 224                 .primary = WM8350_USB_INT,
 225                 .reg = WM8350_INT_OFFSET_2,
 226                 .mask = WM8350_USB_LIMIT_EINT,
 227                 .primary_only = 1,
 228         },
 229         [WM8350_IRQ_WKUP_OFF_STATE] = {
 230                 .primary = WM8350_WKUP_INT,
 231                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 232                 .mask = WM8350_WKUP_OFF_STATE_EINT,
 233         },
 234         [WM8350_IRQ_WKUP_HIB_STATE] = {
 235                 .primary = WM8350_WKUP_INT,
 236                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 237                 .mask = WM8350_WKUP_HIB_STATE_EINT,
 238         },
 239         [WM8350_IRQ_WKUP_CONV_FAULT] = {
 240                 .primary = WM8350_WKUP_INT,
 241                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 242                 .mask = WM8350_WKUP_CONV_FAULT_EINT,
 243         },
 244         [WM8350_IRQ_WKUP_WDOG_RST] = {
 245                 .primary = WM8350_WKUP_INT,
 246                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 247                 .mask = WM8350_WKUP_WDOG_RST_EINT,
 248         },
 249         [WM8350_IRQ_WKUP_GP_PWR_ON] = {
 250                 .primary = WM8350_WKUP_INT,
 251                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 252                 .mask = WM8350_WKUP_GP_PWR_ON_EINT,
 253         },
 254         [WM8350_IRQ_WKUP_ONKEY] = {
 255                 .primary = WM8350_WKUP_INT,
 256                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 257                 .mask = WM8350_WKUP_ONKEY_EINT,
 258         },
 259         [WM8350_IRQ_WKUP_GP_WAKEUP] = {
 260                 .primary = WM8350_WKUP_INT,
 261                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 262                 .mask = WM8350_WKUP_GP_WAKEUP_EINT,
 263         },
 264         [WM8350_IRQ_CODEC_JCK_DET_L] = {
 265                 .primary = WM8350_CODEC_INT,
 266                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 267                 .mask = WM8350_CODEC_JCK_DET_L_EINT,
 268         },
 269         [WM8350_IRQ_CODEC_JCK_DET_R] = {
 270                 .primary = WM8350_CODEC_INT,
 271                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 272                 .mask = WM8350_CODEC_JCK_DET_R_EINT,
 273         },
 274         [WM8350_IRQ_CODEC_MICSCD] = {
 275                 .primary = WM8350_CODEC_INT,
 276                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 277                 .mask = WM8350_CODEC_MICSCD_EINT,
 278         },
 279         [WM8350_IRQ_CODEC_MICD] = {
 280                 .primary = WM8350_CODEC_INT,
 281                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 282                 .mask = WM8350_CODEC_MICD_EINT,
 283         },
 284         [WM8350_IRQ_EXT_USB_FB] = {
 285                 .primary = WM8350_EXT_INT,
 286                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 287                 .mask = WM8350_EXT_USB_FB_EINT,
 288         },
 289         [WM8350_IRQ_EXT_WALL_FB] = {
 290                 .primary = WM8350_EXT_INT,
 291                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 292                 .mask = WM8350_EXT_WALL_FB_EINT,
 293         },
 294         [WM8350_IRQ_EXT_BAT_FB] = {
 295                 .primary = WM8350_EXT_INT,
 296                 .reg = WM8350_COMPARATOR_INT_OFFSET,
 297                 .mask = WM8350_EXT_BAT_FB_EINT,
 298         },
 299         [WM8350_IRQ_GPIO(0)] = {
 300                 .primary = WM8350_GP_INT,
 301                 .reg = WM8350_GPIO_INT_OFFSET,
 302                 .mask = WM8350_GP0_EINT,
 303         },
 304         [WM8350_IRQ_GPIO(1)] = {
 305                 .primary = WM8350_GP_INT,
 306                 .reg = WM8350_GPIO_INT_OFFSET,
 307                 .mask = WM8350_GP1_EINT,
 308         },
 309         [WM8350_IRQ_GPIO(2)] = {
 310                 .primary = WM8350_GP_INT,
 311                 .reg = WM8350_GPIO_INT_OFFSET,
 312                 .mask = WM8350_GP2_EINT,
 313         },
 314         [WM8350_IRQ_GPIO(3)] = {
 315                 .primary = WM8350_GP_INT,
 316                 .reg = WM8350_GPIO_INT_OFFSET,
 317                 .mask = WM8350_GP3_EINT,
 318         },
 319         [WM8350_IRQ_GPIO(4)] = {
 320                 .primary = WM8350_GP_INT,
 321                 .reg = WM8350_GPIO_INT_OFFSET,
 322                 .mask = WM8350_GP4_EINT,
 323         },
 324         [WM8350_IRQ_GPIO(5)] = {
 325                 .primary = WM8350_GP_INT,
 326                 .reg = WM8350_GPIO_INT_OFFSET,
 327                 .mask = WM8350_GP5_EINT,
 328         },
 329         [WM8350_IRQ_GPIO(6)] = {
 330                 .primary = WM8350_GP_INT,
 331                 .reg = WM8350_GPIO_INT_OFFSET,
 332                 .mask = WM8350_GP6_EINT,
 333         },
 334         [WM8350_IRQ_GPIO(7)] = {
 335                 .primary = WM8350_GP_INT,
 336                 .reg = WM8350_GPIO_INT_OFFSET,
 337                 .mask = WM8350_GP7_EINT,
 338         },
 339         [WM8350_IRQ_GPIO(8)] = {
 340                 .primary = WM8350_GP_INT,
 341                 .reg = WM8350_GPIO_INT_OFFSET,
 342                 .mask = WM8350_GP8_EINT,
 343         },
 344         [WM8350_IRQ_GPIO(9)] = {
 345                 .primary = WM8350_GP_INT,
 346                 .reg = WM8350_GPIO_INT_OFFSET,
 347                 .mask = WM8350_GP9_EINT,
 348         },
 349         [WM8350_IRQ_GPIO(10)] = {
 350                 .primary = WM8350_GP_INT,
 351                 .reg = WM8350_GPIO_INT_OFFSET,
 352                 .mask = WM8350_GP10_EINT,
 353         },
 354         [WM8350_IRQ_GPIO(11)] = {
 355                 .primary = WM8350_GP_INT,
 356                 .reg = WM8350_GPIO_INT_OFFSET,
 357                 .mask = WM8350_GP11_EINT,
 358         },
 359         [WM8350_IRQ_GPIO(12)] = {
 360                 .primary = WM8350_GP_INT,
 361                 .reg = WM8350_GPIO_INT_OFFSET,
 362                 .mask = WM8350_GP12_EINT,
 363         },
 364 };
 365
 366 static inline struct wm8350_irq_data *irq_to_wm8350_irq(struct wm8350 *wm8350,
 367                                                         int irq)
 368 {
 369         return &wm8350_irqs[irq - wm8350->irq_base];
 370 }
 371
 372 /*
 373  * This is a threaded IRQ handler so can access I2C/SPI.  Since all
 374  * interrupts are clear on read the IRQ line will be reasserted and
 375  * the physical IRQ will be handled again if another interrupt is
 376  * asserted while we run - in the normal course of events this is a
 377  * rare occurrence so we save I2C/SPI reads.  We're also assuming that
 378  * it's rare to get lots of interrupts firing simultaneously so try to
 379  * minimise I/O.
 380  */
 381 static irqreturn_t wm8350_irq(int irq, void *irq_data)
 382 {
 383         struct wm8350 *wm8350 = irq_data;
 384         u16 level_one;
 385         u16 sub_reg[WM8350_NUM_IRQ_REGS];
 386         int read_done[WM8350_NUM_IRQ_REGS];
 387         struct wm8350_irq_data *data;
 388         int i;
 389
 390         level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS)
 391                 & ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK);
 392
 393         if (!level_one)
 394                 return IRQ_NONE;
 395
 396         memset(&read_done, 0, sizeof(read_done));
 397
 398         for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) {
 399                 data = &wm8350_irqs[i];
 400
 401                 if (!(level_one & data->primary))
 402                         continue;
 403
 404                 if (!read_done[data->reg]) {
 405                         sub_reg[data->reg] =
 406                                 wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 +
 407                                                 data->reg);
 408                         sub_reg[data->reg] &= ~wm8350->irq_masks[data->reg];
 409                         read_done[data->reg] = 1;
 410                 }
 411
 412                 if (sub_reg[data->reg] & data->mask)
 413                         handle_nested_irq(wm8350->irq_base + i);
 414         }
 415
 416         return IRQ_HANDLED;
 417 }
 418
 419 static void wm8350_irq_lock(struct irq_data *data)
 420 {
 421         struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
 422
 423         mutex_lock(&wm8350->irq_lock);
 424 }
 425
 426 static void wm8350_irq_sync_unlock(struct irq_data *data)
 427 {
 428         struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
 429         int i;
 430
 431         for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
 432                 /* If there's been a change in the mask write it back
 433                  * to the hardware. */
 434                 WARN_ON(regmap_update_bits(wm8350->regmap,
 435                                            WM8350_INT_STATUS_1_MASK + i,
 436                                            0xffff, wm8350->irq_masks[i]));
 437         }
 438
 439         mutex_unlock(&wm8350->irq_lock);
 440 }
 441
 442 static void wm8350_irq_enable(struct irq_data *data)
 443 {
 444         struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
 445         struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
 446                                                              data->irq);
 447
 448         wm8350->irq_masks[irq_data->reg] &= ~irq_data->mask;
 449 }
 450
 451 static void wm8350_irq_disable(struct irq_data *data)
 452 {
 453         struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
 454         struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
 455                                                              data->irq);
 456
 457         wm8350->irq_masks[irq_data->reg] |= irq_data->mask;
 458 }
 459
 460 static struct irq_chip wm8350_irq_chip = {
 461         .name                   = "wm8350",
 462         .irq_bus_lock           = wm8350_irq_lock,
 463         .irq_bus_sync_unlock    = wm8350_irq_sync_unlock,
 464         .irq_disable            = wm8350_irq_disable,
 465         .irq_enable             = wm8350_irq_enable,
 466 };
 467
 468 int wm8350_irq_init(struct wm8350 *wm8350, int irq,
 469                     struct wm8350_platform_data *pdata)
 470 {
 471         int ret, cur_irq, i;
 472         int flags = IRQF_ONESHOT;
 473         int irq_base = -1;
 474
 475         if (!irq) {
 476                 dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n");
 477                 return 0;
 478         }
 479
 480         /* Mask top level interrupts */
 481         wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF);
 482
 483         /* Mask all individual interrupts by default and cache the
 484          * masks.  We read the masks back since there are unwritable
 485          * bits in the mask registers. */
 486         for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
 487                 wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK + i,
 488                                  0xFFFF);
 489                 wm8350->irq_masks[i] =
 490                         wm8350_reg_read(wm8350,
 491                                         WM8350_INT_STATUS_1_MASK + i);
 492         }
 493
 494         mutex_init(&wm8350->irq_lock);
 495         wm8350->chip_irq = irq;
 496
 497         if (pdata && pdata->irq_base > 0)
 498                 irq_base = pdata->irq_base;
 499
 500         wm8350->irq_base =
 501                 irq_alloc_descs(irq_base, 0, ARRAY_SIZE(wm8350_irqs), 0);
 502         if (wm8350->irq_base < 0) {
 503                 dev_warn(wm8350->dev, "Allocating irqs failed with %d\n",
 504                         wm8350->irq_base);
 505                 return 0;
 506         }
 507
 508         if (pdata && pdata->irq_high) {
 509                 flags |= IRQF_TRIGGER_HIGH;
 510
 511                 wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
 512                                 WM8350_IRQ_POL);
 513         } else {
 514                 flags |= IRQF_TRIGGER_LOW;
 515
 516                 wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
 517                                   WM8350_IRQ_POL);
 518         }
 519
 520         /* Register with genirq */
 521         for (cur_irq = wm8350->irq_base;
 522              cur_irq < ARRAY_SIZE(wm8350_irqs) + wm8350->irq_base;
 523              cur_irq++) {
 524                 irq_set_chip_data(cur_irq, wm8350);
 525                 irq_set_chip_and_handler(cur_irq, &wm8350_irq_chip,
 526                                          handle_edge_irq);
 527                 irq_set_nested_thread(cur_irq, 1);
 528
 529                 irq_clear_status_flags(cur_irq, IRQ_NOREQUEST | IRQ_NOPROBE);
 530         }
 531
 532         ret = request_threaded_irq(irq, NULL, wm8350_irq, flags,
 533                                    "wm8350", wm8350);
 534         if (ret != 0)
 535                 dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret);
 536
 537         /* Allow interrupts to fire */
 538         wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0);
 539
 540         return ret;
 541 }
 542
 543 int wm8350_irq_exit(struct wm8350 *wm8350)
 544 {
 545         free_irq(wm8350->chip_irq, wm8350);
 546         return 0;
 547 }