1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs 4 * 5 * Copyright 2009 Wolfson Microelectronics PLC. 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/i2c.h> 13 #include <linux/irq.h> 14 #include <linux/mfd/core.h> 15 #include <linux/interrupt.h> 16 #include <linux/irqdomain.h> 17 18 #include <linux/mfd/wm831x/core.h> 19 #include <linux/mfd/wm831x/pdata.h> 20 #include <linux/mfd/wm831x/gpio.h> 21 #include <linux/mfd/wm831x/irq.h> 22 23 #include <linux/delay.h> 24 25 struct wm831x_irq_data { 26 int primary; 27 int reg; 28 int mask; 29 }; 30 31 static struct wm831x_irq_data wm831x_irqs[] = { 32 [WM831X_IRQ_TEMP_THW] = { 33 .primary = WM831X_TEMP_INT, 34 .reg = 1, 35 .mask = WM831X_TEMP_THW_EINT, 36 }, 37 [WM831X_IRQ_GPIO_1] = { 38 .primary = WM831X_GP_INT, 39 .reg = 5, 40 .mask = WM831X_GP1_EINT, 41 }, 42 [WM831X_IRQ_GPIO_2] = { 43 .primary = WM831X_GP_INT, 44 .reg = 5, 45 .mask = WM831X_GP2_EINT, 46 }, 47 [WM831X_IRQ_GPIO_3] = { 48 .primary = WM831X_GP_INT, 49 .reg = 5, 50 .mask = WM831X_GP3_EINT, 51 }, 52 [WM831X_IRQ_GPIO_4] = { 53 .primary = WM831X_GP_INT, 54 .reg = 5, 55 .mask = WM831X_GP4_EINT, 56 }, 57 [WM831X_IRQ_GPIO_5] = { 58 .primary = WM831X_GP_INT, 59 .reg = 5, 60 .mask = WM831X_GP5_EINT, 61 }, 62 [WM831X_IRQ_GPIO_6] = { 63 .primary = WM831X_GP_INT, 64 .reg = 5, 65 .mask = WM831X_GP6_EINT, 66 }, 67 [WM831X_IRQ_GPIO_7] = { 68 .primary = WM831X_GP_INT, 69 .reg = 5, 70 .mask = WM831X_GP7_EINT, 71 }, 72 [WM831X_IRQ_GPIO_8] = { 73 .primary = WM831X_GP_INT, 74 .reg = 5, 75 .mask = WM831X_GP8_EINT, 76 }, 77 [WM831X_IRQ_GPIO_9] = { 78 .primary = WM831X_GP_INT, 79 .reg = 5, 80 .mask = WM831X_GP9_EINT, 81 }, 82 [WM831X_IRQ_GPIO_10] = { 83 .primary = WM831X_GP_INT, 84 .reg = 5, 85 .mask = WM831X_GP10_EINT, 86 }, 87 [WM831X_IRQ_GPIO_11] = { 88 .primary = WM831X_GP_INT, 89 .reg = 5, 90 .mask = WM831X_GP11_EINT, 91 }, 92 [WM831X_IRQ_GPIO_12] = { 93 .primary = WM831X_GP_INT, 94 .reg = 5, 95 .mask = WM831X_GP12_EINT, 96 }, 97 [WM831X_IRQ_GPIO_13] = { 98 .primary = WM831X_GP_INT, 99 .reg = 5, 100 .mask = WM831X_GP13_EINT, 101 }, 102 [WM831X_IRQ_GPIO_14] = { 103 .primary = WM831X_GP_INT, 104 .reg = 5, 105 .mask = WM831X_GP14_EINT, 106 }, 107 [WM831X_IRQ_GPIO_15] = { 108 .primary = WM831X_GP_INT, 109 .reg = 5, 110 .mask = WM831X_GP15_EINT, 111 }, 112 [WM831X_IRQ_GPIO_16] = { 113 .primary = WM831X_GP_INT, 114 .reg = 5, 115 .mask = WM831X_GP16_EINT, 116 }, 117 [WM831X_IRQ_ON] = { 118 .primary = WM831X_ON_PIN_INT, 119 .reg = 1, 120 .mask = WM831X_ON_PIN_EINT, 121 }, 122 [WM831X_IRQ_PPM_SYSLO] = { 123 .primary = WM831X_PPM_INT, 124 .reg = 1, 125 .mask = WM831X_PPM_SYSLO_EINT, 126 }, 127 [WM831X_IRQ_PPM_PWR_SRC] = { 128 .primary = WM831X_PPM_INT, 129 .reg = 1, 130 .mask = WM831X_PPM_PWR_SRC_EINT, 131 }, 132 [WM831X_IRQ_PPM_USB_CURR] = { 133 .primary = WM831X_PPM_INT, 134 .reg = 1, 135 .mask = WM831X_PPM_USB_CURR_EINT, 136 }, 137 [WM831X_IRQ_WDOG_TO] = { 138 .primary = WM831X_WDOG_INT, 139 .reg = 1, 140 .mask = WM831X_WDOG_TO_EINT, 141 }, 142 [WM831X_IRQ_RTC_PER] = { 143 .primary = WM831X_RTC_INT, 144 .reg = 1, 145 .mask = WM831X_RTC_PER_EINT, 146 }, 147 [WM831X_IRQ_RTC_ALM] = { 148 .primary = WM831X_RTC_INT, 149 .reg = 1, 150 .mask = WM831X_RTC_ALM_EINT, 151 }, 152 [WM831X_IRQ_CHG_BATT_HOT] = { 153 .primary = WM831X_CHG_INT, 154 .reg = 2, 155 .mask = WM831X_CHG_BATT_HOT_EINT, 156 }, 157 [WM831X_IRQ_CHG_BATT_COLD] = { 158 .primary = WM831X_CHG_INT, 159 .reg = 2, 160 .mask = WM831X_CHG_BATT_COLD_EINT, 161 }, 162 [WM831X_IRQ_CHG_BATT_FAIL] = { 163 .primary = WM831X_CHG_INT, 164 .reg = 2, 165 .mask = WM831X_CHG_BATT_FAIL_EINT, 166 }, 167 [WM831X_IRQ_CHG_OV] = { 168 .primary = WM831X_CHG_INT, 169 .reg = 2, 170 .mask = WM831X_CHG_OV_EINT, 171 }, 172 [WM831X_IRQ_CHG_END] = { 173 .primary = WM831X_CHG_INT, 174 .reg = 2, 175 .mask = WM831X_CHG_END_EINT, 176 }, 177 [WM831X_IRQ_CHG_TO] = { 178 .primary = WM831X_CHG_INT, 179 .reg = 2, 180 .mask = WM831X_CHG_TO_EINT, 181 }, 182 [WM831X_IRQ_CHG_MODE] = { 183 .primary = WM831X_CHG_INT, 184 .reg = 2, 185 .mask = WM831X_CHG_MODE_EINT, 186 }, 187 [WM831X_IRQ_CHG_START] = { 188 .primary = WM831X_CHG_INT, 189 .reg = 2, 190 .mask = WM831X_CHG_START_EINT, 191 }, 192 [WM831X_IRQ_TCHDATA] = { 193 .primary = WM831X_TCHDATA_INT, 194 .reg = 1, 195 .mask = WM831X_TCHDATA_EINT, 196 }, 197 [WM831X_IRQ_TCHPD] = { 198 .primary = WM831X_TCHPD_INT, 199 .reg = 1, 200 .mask = WM831X_TCHPD_EINT, 201 }, 202 [WM831X_IRQ_AUXADC_DATA] = { 203 .primary = WM831X_AUXADC_INT, 204 .reg = 1, 205 .mask = WM831X_AUXADC_DATA_EINT, 206 }, 207 [WM831X_IRQ_AUXADC_DCOMP1] = { 208 .primary = WM831X_AUXADC_INT, 209 .reg = 1, 210 .mask = WM831X_AUXADC_DCOMP1_EINT, 211 }, 212 [WM831X_IRQ_AUXADC_DCOMP2] = { 213 .primary = WM831X_AUXADC_INT, 214 .reg = 1, 215 .mask = WM831X_AUXADC_DCOMP2_EINT, 216 }, 217 [WM831X_IRQ_AUXADC_DCOMP3] = { 218 .primary = WM831X_AUXADC_INT, 219 .reg = 1, 220 .mask = WM831X_AUXADC_DCOMP3_EINT, 221 }, 222 [WM831X_IRQ_AUXADC_DCOMP4] = { 223 .primary = WM831X_AUXADC_INT, 224 .reg = 1, 225 .mask = WM831X_AUXADC_DCOMP4_EINT, 226 }, 227 [WM831X_IRQ_CS1] = { 228 .primary = WM831X_CS_INT, 229 .reg = 2, 230 .mask = WM831X_CS1_EINT, 231 }, 232 [WM831X_IRQ_CS2] = { 233 .primary = WM831X_CS_INT, 234 .reg = 2, 235 .mask = WM831X_CS2_EINT, 236 }, 237 [WM831X_IRQ_HC_DC1] = { 238 .primary = WM831X_HC_INT, 239 .reg = 4, 240 .mask = WM831X_HC_DC1_EINT, 241 }, 242 [WM831X_IRQ_HC_DC2] = { 243 .primary = WM831X_HC_INT, 244 .reg = 4, 245 .mask = WM831X_HC_DC2_EINT, 246 }, 247 [WM831X_IRQ_UV_LDO1] = { 248 .primary = WM831X_UV_INT, 249 .reg = 3, 250 .mask = WM831X_UV_LDO1_EINT, 251 }, 252 [WM831X_IRQ_UV_LDO2] = { 253 .primary = WM831X_UV_INT, 254 .reg = 3, 255 .mask = WM831X_UV_LDO2_EINT, 256 }, 257 [WM831X_IRQ_UV_LDO3] = { 258 .primary = WM831X_UV_INT, 259 .reg = 3, 260 .mask = WM831X_UV_LDO3_EINT, 261 }, 262 [WM831X_IRQ_UV_LDO4] = { 263 .primary = WM831X_UV_INT, 264 .reg = 3, 265 .mask = WM831X_UV_LDO4_EINT, 266 }, 267 [WM831X_IRQ_UV_LDO5] = { 268 .primary = WM831X_UV_INT, 269 .reg = 3, 270 .mask = WM831X_UV_LDO5_EINT, 271 }, 272 [WM831X_IRQ_UV_LDO6] = { 273 .primary = WM831X_UV_INT, 274 .reg = 3, 275 .mask = WM831X_UV_LDO6_EINT, 276 }, 277 [WM831X_IRQ_UV_LDO7] = { 278 .primary = WM831X_UV_INT, 279 .reg = 3, 280 .mask = WM831X_UV_LDO7_EINT, 281 }, 282 [WM831X_IRQ_UV_LDO8] = { 283 .primary = WM831X_UV_INT, 284 .reg = 3, 285 .mask = WM831X_UV_LDO8_EINT, 286 }, 287 [WM831X_IRQ_UV_LDO9] = { 288 .primary = WM831X_UV_INT, 289 .reg = 3, 290 .mask = WM831X_UV_LDO9_EINT, 291 }, 292 [WM831X_IRQ_UV_LDO10] = { 293 .primary = WM831X_UV_INT, 294 .reg = 3, 295 .mask = WM831X_UV_LDO10_EINT, 296 }, 297 [WM831X_IRQ_UV_DC1] = { 298 .primary = WM831X_UV_INT, 299 .reg = 4, 300 .mask = WM831X_UV_DC1_EINT, 301 }, 302 [WM831X_IRQ_UV_DC2] = { 303 .primary = WM831X_UV_INT, 304 .reg = 4, 305 .mask = WM831X_UV_DC2_EINT, 306 }, 307 [WM831X_IRQ_UV_DC3] = { 308 .primary = WM831X_UV_INT, 309 .reg = 4, 310 .mask = WM831X_UV_DC3_EINT, 311 }, 312 [WM831X_IRQ_UV_DC4] = { 313 .primary = WM831X_UV_INT, 314 .reg = 4, 315 .mask = WM831X_UV_DC4_EINT, 316 }, 317 }; 318 319 static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data) 320 { 321 return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg; 322 } 323 324 static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x, 325 int irq) 326 { 327 return &wm831x_irqs[irq]; 328 } 329 330 static void wm831x_irq_lock(struct irq_data *data) 331 { 332 struct wm831x *wm831x = irq_data_get_irq_chip_data(data); 333 334 mutex_lock(&wm831x->irq_lock); 335 } 336 337 static void wm831x_irq_sync_unlock(struct irq_data *data) 338 { 339 struct wm831x *wm831x = irq_data_get_irq_chip_data(data); 340 int i; 341 342 for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) { 343 if (wm831x->gpio_update[i]) { 344 wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + i, 345 WM831X_GPN_INT_MODE | WM831X_GPN_POL, 346 wm831x->gpio_update[i]); 347 wm831x->gpio_update[i] = 0; 348 } 349 } 350 351 for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) { 352 /* If there's been a change in the mask write it back 353 * to the hardware. */ 354 if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) { 355 dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n", 356 WM831X_INTERRUPT_STATUS_1_MASK + i, 357 wm831x->irq_masks_cur[i]); 358 359 wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i]; 360 wm831x_reg_write(wm831x, 361 WM831X_INTERRUPT_STATUS_1_MASK + i, 362 wm831x->irq_masks_cur[i]); 363 } 364 } 365 366 mutex_unlock(&wm831x->irq_lock); 367 } 368 369 static void wm831x_irq_enable(struct irq_data *data) 370 { 371 struct wm831x *wm831x = irq_data_get_irq_chip_data(data); 372 struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, 373 data->hwirq); 374 375 wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; 376 } 377 378 static void wm831x_irq_disable(struct irq_data *data) 379 { 380 struct wm831x *wm831x = irq_data_get_irq_chip_data(data); 381 struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, 382 data->hwirq); 383 384 wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; 385 } 386 387 static int wm831x_irq_set_type(struct irq_data *data, unsigned int type) 388 { 389 struct wm831x *wm831x = irq_data_get_irq_chip_data(data); 390 int irq; 391 392 irq = data->hwirq; 393 394 if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) { 395 /* Ignore internal-only IRQs */ 396 if (irq >= 0 && irq < WM831X_NUM_IRQS) 397 return 0; 398 else 399 return -EINVAL; 400 } 401 402 /* Rebase the IRQ into the GPIO range so we've got a sensible array 403 * index. 404 */ 405 irq -= WM831X_IRQ_GPIO_1; 406 407 /* We set the high bit to flag that we need an update; don't 408 * do the update here as we can be called with the bus lock 409 * held. 410 */ 411 wm831x->gpio_level_low[irq] = false; 412 wm831x->gpio_level_high[irq] = false; 413 switch (type) { 414 case IRQ_TYPE_EDGE_BOTH: 415 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE; 416 break; 417 case IRQ_TYPE_EDGE_RISING: 418 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL; 419 break; 420 case IRQ_TYPE_EDGE_FALLING: 421 wm831x->gpio_update[irq] = 0x10000; 422 break; 423 case IRQ_TYPE_LEVEL_HIGH: 424 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL; 425 wm831x->gpio_level_high[irq] = true; 426 break; 427 case IRQ_TYPE_LEVEL_LOW: 428 wm831x->gpio_update[irq] = 0x10000; 429 wm831x->gpio_level_low[irq] = true; 430 break; 431 default: 432 return -EINVAL; 433 } 434 435 return 0; 436 } 437 438 static struct irq_chip wm831x_irq_chip = { 439 .name = "wm831x", 440 .irq_bus_lock = wm831x_irq_lock, 441 .irq_bus_sync_unlock = wm831x_irq_sync_unlock, 442 .irq_disable = wm831x_irq_disable, 443 .irq_enable = wm831x_irq_enable, 444 .irq_set_type = wm831x_irq_set_type, 445 }; 446 447 /* The processing of the primary interrupt occurs in a thread so that 448 * we can interact with the device over I2C or SPI. */ 449 static irqreturn_t wm831x_irq_thread(int irq, void *data) 450 { 451 struct wm831x *wm831x = data; 452 unsigned int i; 453 int primary, status_addr, ret; 454 int status_regs[WM831X_NUM_IRQ_REGS] = { 0 }; 455 int read[WM831X_NUM_IRQ_REGS] = { 0 }; 456 int *status; 457 458 primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS); 459 if (primary < 0) { 460 dev_err(wm831x->dev, "Failed to read system interrupt: %d\n", 461 primary); 462 goto out; 463 } 464 465 /* The touch interrupts are visible in the primary register as 466 * an optimisation; open code this to avoid complicating the 467 * main handling loop and so we can also skip iterating the 468 * descriptors. 469 */ 470 if (primary & WM831X_TCHPD_INT) 471 handle_nested_irq(irq_find_mapping(wm831x->irq_domain, 472 WM831X_IRQ_TCHPD)); 473 if (primary & WM831X_TCHDATA_INT) 474 handle_nested_irq(irq_find_mapping(wm831x->irq_domain, 475 WM831X_IRQ_TCHDATA)); 476 primary &= ~(WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT); 477 478 for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) { 479 int offset = wm831x_irqs[i].reg - 1; 480 481 if (!(primary & wm831x_irqs[i].primary)) 482 continue; 483 484 status = &status_regs[offset]; 485 486 /* Hopefully there should only be one register to read 487 * each time otherwise we ought to do a block read. */ 488 if (!read[offset]) { 489 status_addr = irq_data_to_status_reg(&wm831x_irqs[i]); 490 491 *status = wm831x_reg_read(wm831x, status_addr); 492 if (*status < 0) { 493 dev_err(wm831x->dev, 494 "Failed to read IRQ status: %d\n", 495 *status); 496 goto out; 497 } 498 499 read[offset] = 1; 500 501 /* Ignore any bits that we don't think are masked */ 502 *status &= ~wm831x->irq_masks_cur[offset]; 503 504 /* Acknowledge now so we don't miss 505 * notifications while we handle. 506 */ 507 wm831x_reg_write(wm831x, status_addr, *status); 508 } 509 510 if (*status & wm831x_irqs[i].mask) 511 handle_nested_irq(irq_find_mapping(wm831x->irq_domain, 512 i)); 513 514 /* Simulate an edge triggered IRQ by polling the input 515 * status. This is sucky but improves interoperability. 516 */ 517 if (primary == WM831X_GP_INT && 518 wm831x->gpio_level_high[i - WM831X_IRQ_GPIO_1]) { 519 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); 520 while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) { 521 handle_nested_irq(irq_find_mapping(wm831x->irq_domain, 522 i)); 523 ret = wm831x_reg_read(wm831x, 524 WM831X_GPIO_LEVEL); 525 } 526 } 527 528 if (primary == WM831X_GP_INT && 529 wm831x->gpio_level_low[i - WM831X_IRQ_GPIO_1]) { 530 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); 531 while (!(ret & 1 << (i - WM831X_IRQ_GPIO_1))) { 532 handle_nested_irq(irq_find_mapping(wm831x->irq_domain, 533 i)); 534 ret = wm831x_reg_read(wm831x, 535 WM831X_GPIO_LEVEL); 536 } 537 } 538 } 539 540 out: 541 return IRQ_HANDLED; 542 } 543 544 static int wm831x_irq_map(struct irq_domain *h, unsigned int virq, 545 irq_hw_number_t hw) 546 { 547 irq_set_chip_data(virq, h->host_data); 548 irq_set_chip_and_handler(virq, &wm831x_irq_chip, handle_edge_irq); 549 irq_set_nested_thread(virq, 1); 550 irq_set_noprobe(virq); 551 552 return 0; 553 } 554 555 static const struct irq_domain_ops wm831x_irq_domain_ops = { 556 .map = wm831x_irq_map, 557 .xlate = irq_domain_xlate_twocell, 558 }; 559 560 int wm831x_irq_init(struct wm831x *wm831x, int irq) 561 { 562 struct wm831x_pdata *pdata = &wm831x->pdata; 563 struct irq_domain *domain; 564 int i, ret, irq_base; 565 566 mutex_init(&wm831x->irq_lock); 567 568 /* Mask the individual interrupt sources */ 569 for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) { 570 wm831x->irq_masks_cur[i] = 0xffff; 571 wm831x->irq_masks_cache[i] = 0xffff; 572 wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i, 573 0xffff); 574 } 575 576 /* Try to dynamically allocate IRQs if no base is specified */ 577 if (pdata->irq_base) { 578 irq_base = irq_alloc_descs(pdata->irq_base, 0, 579 WM831X_NUM_IRQS, 0); 580 if (irq_base < 0) { 581 dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n", 582 irq_base); 583 irq_base = 0; 584 } 585 } else { 586 irq_base = 0; 587 } 588 589 if (irq_base) 590 domain = irq_domain_add_legacy(wm831x->dev->of_node, 591 ARRAY_SIZE(wm831x_irqs), 592 irq_base, 0, 593 &wm831x_irq_domain_ops, 594 wm831x); 595 else 596 domain = irq_domain_add_linear(wm831x->dev->of_node, 597 ARRAY_SIZE(wm831x_irqs), 598 &wm831x_irq_domain_ops, 599 wm831x); 600 601 if (!domain) { 602 dev_warn(wm831x->dev, "Failed to allocate IRQ domain\n"); 603 return -EINVAL; 604 } 605 606 if (pdata->irq_cmos) 607 i = 0; 608 else 609 i = WM831X_IRQ_OD; 610 611 wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG, 612 WM831X_IRQ_OD, i); 613 614 wm831x->irq = irq; 615 wm831x->irq_domain = domain; 616 617 if (irq) { 618 /* Try to flag /IRQ as a wake source; there are a number of 619 * unconditional wake sources in the PMIC so this isn't 620 * conditional but we don't actually care *too* much if it 621 * fails. 622 */ 623 ret = enable_irq_wake(irq); 624 if (ret != 0) { 625 dev_warn(wm831x->dev, 626 "Can't enable IRQ as wake source: %d\n", 627 ret); 628 } 629 630 ret = request_threaded_irq(irq, NULL, wm831x_irq_thread, 631 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 632 "wm831x", wm831x); 633 if (ret != 0) { 634 dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n", 635 irq, ret); 636 return ret; 637 } 638 } else { 639 dev_warn(wm831x->dev, 640 "No interrupt specified - functionality limited\n"); 641 } 642 643 /* Enable top level interrupts, we mask at secondary level */ 644 wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0); 645 646 return 0; 647 } 648 649 void wm831x_irq_exit(struct wm831x *wm831x) 650 { 651 if (wm831x->irq) 652 free_irq(wm831x->irq, wm831x); 653 } 654