drivers/mfd/wm831x-irq.c - kernel/prism - Git at Google

 /*
  * wm831x-irq.c  --  Interrupt controller support for Wolfson WM831x PMICs
  *
  * Copyright 2009 Wolfson Microelectronics PLC.
  *
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  *
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/mfd/core.h>
 #include <linux/interrupt.h>

 #include <linux/mfd/wm831x/core.h>
 #include <linux/mfd/wm831x/pdata.h>
 #include <linux/mfd/wm831x/irq.h>

 #include <linux/delay.h>

 /*
  * Since generic IRQs don't currently support interrupt controllers on
  * interrupt driven buses we don't use genirq but instead provide an
  * interface that looks very much like the standard ones.  This leads
  * to some bodges, including storing interrupt handler information in
  * the static irq_data table we use to look up the data for individual
  * interrupts, but hopefully won't last too long.
  */

 struct wm831x_irq_data {
 	int primary;
 	int reg;
 	int mask;
 	irq_handler_t handler;
 	void *handler_data;
 };

 static struct wm831x_irq_data wm831x_irqs[] = {
 	[WM831X_IRQ_TEMP_THW] = {
 		.primary = WM831X_TEMP_INT,
 		.reg = 1,
 		.mask = WM831X_TEMP_THW_EINT,
 	},
 	[WM831X_IRQ_GPIO_1] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP1_EINT,
 	},
 	[WM831X_IRQ_GPIO_2] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP2_EINT,
 	},
 	[WM831X_IRQ_GPIO_3] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP3_EINT,
 	},
 	[WM831X_IRQ_GPIO_4] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP4_EINT,
 	},
 	[WM831X_IRQ_GPIO_5] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP5_EINT,
 	},
 	[WM831X_IRQ_GPIO_6] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP6_EINT,
 	},
 	[WM831X_IRQ_GPIO_7] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP7_EINT,
 	},
 	[WM831X_IRQ_GPIO_8] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP8_EINT,
 	},
 	[WM831X_IRQ_GPIO_9] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP9_EINT,
 	},
 	[WM831X_IRQ_GPIO_10] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP10_EINT,
 	},
 	[WM831X_IRQ_GPIO_11] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP11_EINT,
 	},
 	[WM831X_IRQ_GPIO_12] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP12_EINT,
 	},
 	[WM831X_IRQ_GPIO_13] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP13_EINT,
 	},
 	[WM831X_IRQ_GPIO_14] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP14_EINT,
 	},
 	[WM831X_IRQ_GPIO_15] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP15_EINT,
 	},
 	[WM831X_IRQ_GPIO_16] = {
 		.primary = WM831X_GP_INT,
 		.reg = 5,
 		.mask = WM831X_GP16_EINT,
 	},
 	[WM831X_IRQ_ON] = {
 		.primary = WM831X_ON_PIN_INT,
 		.reg = 1,
 		.mask = WM831X_ON_PIN_EINT,
 	},
 	[WM831X_IRQ_PPM_SYSLO] = {
 		.primary = WM831X_PPM_INT,
 		.reg = 1,
 		.mask = WM831X_PPM_SYSLO_EINT,
 	},
 	[WM831X_IRQ_PPM_PWR_SRC] = {
 		.primary = WM831X_PPM_INT,
 		.reg = 1,
 		.mask = WM831X_PPM_PWR_SRC_EINT,
 	},
 	[WM831X_IRQ_PPM_USB_CURR] = {
 		.primary = WM831X_PPM_INT,
 		.reg = 1,
 		.mask = WM831X_PPM_USB_CURR_EINT,
 	},
 	[WM831X_IRQ_WDOG_TO] = {
 		.primary = WM831X_WDOG_INT,
 		.reg = 1,
 		.mask = WM831X_WDOG_TO_EINT,
 	},
 	[WM831X_IRQ_RTC_PER] = {
 		.primary = WM831X_RTC_INT,
 		.reg = 1,
 		.mask = WM831X_RTC_PER_EINT,
 	},
 	[WM831X_IRQ_RTC_ALM] = {
 		.primary = WM831X_RTC_INT,
 		.reg = 1,
 		.mask = WM831X_RTC_ALM_EINT,
 	},
 	[WM831X_IRQ_CHG_BATT_HOT] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_BATT_HOT_EINT,
 	},
 	[WM831X_IRQ_CHG_BATT_COLD] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_BATT_COLD_EINT,
 	},
 	[WM831X_IRQ_CHG_BATT_FAIL] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_BATT_FAIL_EINT,
 	},
 	[WM831X_IRQ_CHG_OV] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_OV_EINT,
 	},
 	[WM831X_IRQ_CHG_END] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_END_EINT,
 	},
 	[WM831X_IRQ_CHG_TO] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_TO_EINT,
 	},
 	[WM831X_IRQ_CHG_MODE] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_MODE_EINT,
 	},
 	[WM831X_IRQ_CHG_START] = {
 		.primary = WM831X_CHG_INT,
 		.reg = 2,
 		.mask = WM831X_CHG_START_EINT,
 	},
 	[WM831X_IRQ_TCHDATA] = {
 		.primary = WM831X_TCHDATA_INT,
 		.reg = 1,
 		.mask = WM831X_TCHDATA_EINT,
 	},
 	[WM831X_IRQ_TCHPD] = {
 		.primary = WM831X_TCHPD_INT,
 		.reg = 1,
 		.mask = WM831X_TCHPD_EINT,
 	},
 	[WM831X_IRQ_AUXADC_DATA] = {
 		.primary = WM831X_AUXADC_INT,
 		.reg = 1,
 		.mask = WM831X_AUXADC_DATA_EINT,
 	},
 	[WM831X_IRQ_AUXADC_DCOMP1] = {
 		.primary = WM831X_AUXADC_INT,
 		.reg = 1,
 		.mask = WM831X_AUXADC_DCOMP1_EINT,
 	},
 	[WM831X_IRQ_AUXADC_DCOMP2] = {
 		.primary = WM831X_AUXADC_INT,
 		.reg = 1,
 		.mask = WM831X_AUXADC_DCOMP2_EINT,
 	},
 	[WM831X_IRQ_AUXADC_DCOMP3] = {
 		.primary = WM831X_AUXADC_INT,
 		.reg = 1,
 		.mask = WM831X_AUXADC_DCOMP3_EINT,
 	},
 	[WM831X_IRQ_AUXADC_DCOMP4] = {
 		.primary = WM831X_AUXADC_INT,
 		.reg = 1,
 		.mask = WM831X_AUXADC_DCOMP4_EINT,
 	},
 	[WM831X_IRQ_CS1] = {
 		.primary = WM831X_CS_INT,
 		.reg = 2,
 		.mask = WM831X_CS1_EINT,
 	},
 	[WM831X_IRQ_CS2] = {
 		.primary = WM831X_CS_INT,
 		.reg = 2,
 		.mask = WM831X_CS2_EINT,
 	},
 	[WM831X_IRQ_HC_DC1] = {
 		.primary = WM831X_HC_INT,
 		.reg = 4,
 		.mask = WM831X_HC_DC1_EINT,
 	},
 	[WM831X_IRQ_HC_DC2] = {
 		.primary = WM831X_HC_INT,
 		.reg = 4,
 		.mask = WM831X_HC_DC2_EINT,
 	},
 	[WM831X_IRQ_UV_LDO1] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO1_EINT,
 	},
 	[WM831X_IRQ_UV_LDO2] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO2_EINT,
 	},
 	[WM831X_IRQ_UV_LDO3] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO3_EINT,
 	},
 	[WM831X_IRQ_UV_LDO4] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO4_EINT,
 	},
 	[WM831X_IRQ_UV_LDO5] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO5_EINT,
 	},
 	[WM831X_IRQ_UV_LDO6] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO6_EINT,
 	},
 	[WM831X_IRQ_UV_LDO7] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO7_EINT,
 	},
 	[WM831X_IRQ_UV_LDO8] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO8_EINT,
 	},
 	[WM831X_IRQ_UV_LDO9] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO9_EINT,
 	},
 	[WM831X_IRQ_UV_LDO10] = {
 		.primary = WM831X_UV_INT,
 		.reg = 3,
 		.mask = WM831X_UV_LDO10_EINT,
 	},
 	[WM831X_IRQ_UV_DC1] = {
 		.primary = WM831X_UV_INT,
 		.reg = 4,
 		.mask = WM831X_UV_DC1_EINT,
 	},
 	[WM831X_IRQ_UV_DC2] = {
 		.primary = WM831X_UV_INT,
 		.reg = 4,
 		.mask = WM831X_UV_DC2_EINT,
 	},
 	[WM831X_IRQ_UV_DC3] = {
 		.primary = WM831X_UV_INT,
 		.reg = 4,
 		.mask = WM831X_UV_DC3_EINT,
 	},
 	[WM831X_IRQ_UV_DC4] = {
 		.primary = WM831X_UV_INT,
 		.reg = 4,
 		.mask = WM831X_UV_DC4_EINT,
 	},
 };

 static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
 {
 	return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
 }

 static inline int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data)
 {
 	return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
 }

 static void __wm831x_enable_irq(struct wm831x *wm831x, int irq)
 {
 	struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];

 	wm831x->irq_masks[irq_data->reg - 1] &= ~irq_data->mask;
 	wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data),
 			 wm831x->irq_masks[irq_data->reg - 1]);
 }

 void wm831x_enable_irq(struct wm831x *wm831x, int irq)
 {
 	mutex_lock(&wm831x->irq_lock);
 	__wm831x_enable_irq(wm831x, irq);
 	mutex_unlock(&wm831x->irq_lock);
 }
 EXPORT_SYMBOL_GPL(wm831x_enable_irq);

 static void __wm831x_disable_irq(struct wm831x *wm831x, int irq)
 {
 	struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];

 	wm831x->irq_masks[irq_data->reg - 1] |= irq_data->mask;
 	wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data),
 			 wm831x->irq_masks[irq_data->reg - 1]);
 }

 void wm831x_disable_irq(struct wm831x *wm831x, int irq)
 {
 	mutex_lock(&wm831x->irq_lock);
 	__wm831x_disable_irq(wm831x, irq);
 	mutex_unlock(&wm831x->irq_lock);
 }
 EXPORT_SYMBOL_GPL(wm831x_disable_irq);

 int wm831x_request_irq(struct wm831x *wm831x,
 		       unsigned int irq, irq_handler_t handler,
 		       unsigned long flags, const char *name,
 		       void *dev)
 {
 	int ret = 0;

 	if (irq < 0 || irq >= WM831X_NUM_IRQS)
 		return -EINVAL;

 	mutex_lock(&wm831x->irq_lock);

 	if (wm831x_irqs[irq].handler) {
 		dev_err(wm831x->dev, "Already have handler for IRQ %d\n", irq);
 		ret = -EINVAL;
 		goto out;
 	}

 	wm831x_irqs[irq].handler = handler;
 	wm831x_irqs[irq].handler_data = dev;

 	__wm831x_enable_irq(wm831x, irq);

 out:
 	mutex_unlock(&wm831x->irq_lock);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm831x_request_irq);

 void wm831x_free_irq(struct wm831x *wm831x, unsigned int irq, void *data)
 {
 	if (irq < 0 || irq >= WM831X_NUM_IRQS)
 		return;

 	mutex_lock(&wm831x->irq_lock);

 	wm831x_irqs[irq].handler = NULL;
 	wm831x_irqs[irq].handler_data = NULL;

 	__wm831x_disable_irq(wm831x, irq);

 	mutex_unlock(&wm831x->irq_lock);
 }
 EXPORT_SYMBOL_GPL(wm831x_free_irq);


 static void wm831x_handle_irq(struct wm831x *wm831x, int irq, int status)
 {
 	struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];

 	if (irq_data->handler) {
 		irq_data->handler(irq, irq_data->handler_data);
 		wm831x_reg_write(wm831x, irq_data_to_status_reg(irq_data),
 				 irq_data->mask);
 	} else {
 		dev_err(wm831x->dev, "Unhandled IRQ %d, masking\n", irq);
 		__wm831x_disable_irq(wm831x, irq);
 	}
 }

 /* Main interrupt handling occurs in a workqueue since we need
  * interrupts enabled to interact with the chip. */
 static void wm831x_irq_worker(struct work_struct *work)
 {
 	struct wm831x *wm831x = container_of(work, struct wm831x, irq_work);
 	unsigned int i;
 	int primary;
 	int status_regs[5];
 	int read[5] = { 0 };
 	int *status;

 	primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
 	if (primary < 0) {
 		dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
 			primary);
 		goto out;
 	}

 	mutex_lock(&wm831x->irq_lock);

 	for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
 		int offset = wm831x_irqs[i].reg - 1;

 		if (!(primary & wm831x_irqs[i].primary))
 			continue;

 		status = &status_regs[offset];

 		/* Hopefully there should only be one register to read
 		 * each time otherwise we ought to do a block read. */
 		if (!read[offset]) {
 			*status = wm831x_reg_read(wm831x,
 				     irq_data_to_status_reg(&wm831x_irqs[i]));
 			if (*status < 0) {
 				dev_err(wm831x->dev,
 					"Failed to read IRQ status: %d\n",
 					*status);
 				goto out_lock;
 			}

 			/* Mask out the disabled IRQs */
 			*status &= ~wm831x->irq_masks[offset];
 			read[offset] = 1;
 		}

 		if (*status & wm831x_irqs[i].mask)
 			wm831x_handle_irq(wm831x, i, *status);
 	}

 out_lock:
 	mutex_unlock(&wm831x->irq_lock);
 out:
 	enable_irq(wm831x->irq);
 }


 static irqreturn_t wm831x_cpu_irq(int irq, void *data)
 {
 	struct wm831x *wm831x = data;

 	/* Shut the interrupt to the CPU up and schedule the actual
 	 * handler; we can't check that the IRQ is asserted. */
 	disable_irq_nosync(irq);

 	queue_work(wm831x->irq_wq, &wm831x->irq_work);

 	return IRQ_HANDLED;
 }

 int wm831x_irq_init(struct wm831x *wm831x, int irq)
 {
 	int i, ret;

 	mutex_init(&wm831x->irq_lock);

 	if (!irq) {
 		dev_warn(wm831x->dev,
 			 "No interrupt specified - functionality limited\n");
 		return 0;
 	}


 	wm831x->irq_wq = create_singlethread_workqueue("wm831x-irq");
 	if (!wm831x->irq_wq) {
 		dev_err(wm831x->dev, "Failed to allocate IRQ worker\n");
 		return -ESRCH;
 	}

 	wm831x->irq = irq;
 	INIT_WORK(&wm831x->irq_work, wm831x_irq_worker);

 	/* Mask the individual interrupt sources */
 	for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks); i++) {
 		wm831x->irq_masks[i] = 0xffff;
 		wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
 				 0xffff);
 	}

 	/* Enable top level interrupts, we mask at secondary level */
 	wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);

 	/* We're good to go.  We set IRQF_SHARED since there's a
 	 * chance the driver will interoperate with another driver but
 	 * the need to disable the IRQ while handing via I2C/SPI means
 	 * that this may break and performance will be impacted.  If
 	 * this does happen it's a hardware design issue and the only
 	 * other alternative would be polling.
 	 */
 	ret = request_irq(irq, wm831x_cpu_irq, IRQF_TRIGGER_LOW | IRQF_SHARED,
 			  "wm831x", wm831x);
 	if (ret != 0) {
 		dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
 			irq, ret);
 		return ret;
 	}

 	return 0;
 }

 void wm831x_irq_exit(struct wm831x *wm831x)
 {
 	if (wm831x->irq)
 		free_irq(wm831x->irq, wm831x);
 }
	/*
	* wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs
	*
	* Copyright 2009 Wolfson Microelectronics PLC.
	*
	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/mfd/core.h>
	#include <linux/interrupt.h>

	#include <linux/mfd/wm831x/core.h>
	#include <linux/mfd/wm831x/pdata.h>
	#include <linux/mfd/wm831x/irq.h>

	#include <linux/delay.h>

	/*
	* Since generic IRQs don't currently support interrupt controllers on
	* interrupt driven buses we don't use genirq but instead provide an
	* interface that looks very much like the standard ones. This leads
	* to some bodges, including storing interrupt handler information in
	* the static irq_data table we use to look up the data for individual
	* interrupts, but hopefully won't last too long.
	*/

	struct wm831x_irq_data {
	int primary;
	int reg;
	int mask;
	irq_handler_t handler;
	void *handler_data;
	};

	static struct wm831x_irq_data wm831x_irqs[] = {
	[WM831X_IRQ_TEMP_THW] = {
	.primary = WM831X_TEMP_INT,
	.reg = 1,
	.mask = WM831X_TEMP_THW_EINT,
	},
	[WM831X_IRQ_GPIO_1] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP1_EINT,
	},
	[WM831X_IRQ_GPIO_2] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP2_EINT,
	},
	[WM831X_IRQ_GPIO_3] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP3_EINT,
	},
	[WM831X_IRQ_GPIO_4] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP4_EINT,
	},
	[WM831X_IRQ_GPIO_5] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP5_EINT,
	},
	[WM831X_IRQ_GPIO_6] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP6_EINT,
	},
	[WM831X_IRQ_GPIO_7] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP7_EINT,
	},
	[WM831X_IRQ_GPIO_8] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP8_EINT,
	},
	[WM831X_IRQ_GPIO_9] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP9_EINT,
	},
	[WM831X_IRQ_GPIO_10] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP10_EINT,
	},
	[WM831X_IRQ_GPIO_11] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP11_EINT,
	},
	[WM831X_IRQ_GPIO_12] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP12_EINT,
	},
	[WM831X_IRQ_GPIO_13] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP13_EINT,
	},
	[WM831X_IRQ_GPIO_14] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP14_EINT,
	},
	[WM831X_IRQ_GPIO_15] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP15_EINT,
	},
	[WM831X_IRQ_GPIO_16] = {
	.primary = WM831X_GP_INT,
	.reg = 5,
	.mask = WM831X_GP16_EINT,
	},
	[WM831X_IRQ_ON] = {
	.primary = WM831X_ON_PIN_INT,
	.reg = 1,
	.mask = WM831X_ON_PIN_EINT,
	},
	[WM831X_IRQ_PPM_SYSLO] = {
	.primary = WM831X_PPM_INT,
	.reg = 1,
	.mask = WM831X_PPM_SYSLO_EINT,
	},
	[WM831X_IRQ_PPM_PWR_SRC] = {
	.primary = WM831X_PPM_INT,
	.reg = 1,
	.mask = WM831X_PPM_PWR_SRC_EINT,
	},
	[WM831X_IRQ_PPM_USB_CURR] = {
	.primary = WM831X_PPM_INT,
	.reg = 1,
	.mask = WM831X_PPM_USB_CURR_EINT,
	},
	[WM831X_IRQ_WDOG_TO] = {
	.primary = WM831X_WDOG_INT,
	.reg = 1,
	.mask = WM831X_WDOG_TO_EINT,
	},
	[WM831X_IRQ_RTC_PER] = {
	.primary = WM831X_RTC_INT,
	.reg = 1,
	.mask = WM831X_RTC_PER_EINT,
	},
	[WM831X_IRQ_RTC_ALM] = {
	.primary = WM831X_RTC_INT,
	.reg = 1,
	.mask = WM831X_RTC_ALM_EINT,
	},
	[WM831X_IRQ_CHG_BATT_HOT] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_BATT_HOT_EINT,
	},
	[WM831X_IRQ_CHG_BATT_COLD] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_BATT_COLD_EINT,
	},
	[WM831X_IRQ_CHG_BATT_FAIL] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_BATT_FAIL_EINT,
	},
	[WM831X_IRQ_CHG_OV] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_OV_EINT,
	},
	[WM831X_IRQ_CHG_END] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_END_EINT,
	},
	[WM831X_IRQ_CHG_TO] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_TO_EINT,
	},
	[WM831X_IRQ_CHG_MODE] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_MODE_EINT,
	},
	[WM831X_IRQ_CHG_START] = {
	.primary = WM831X_CHG_INT,
	.reg = 2,
	.mask = WM831X_CHG_START_EINT,
	},
	[WM831X_IRQ_TCHDATA] = {
	.primary = WM831X_TCHDATA_INT,
	.reg = 1,
	.mask = WM831X_TCHDATA_EINT,
	},
	[WM831X_IRQ_TCHPD] = {
	.primary = WM831X_TCHPD_INT,
	.reg = 1,
	.mask = WM831X_TCHPD_EINT,
	},
	[WM831X_IRQ_AUXADC_DATA] = {
	.primary = WM831X_AUXADC_INT,
	.reg = 1,
	.mask = WM831X_AUXADC_DATA_EINT,
	},
	[WM831X_IRQ_AUXADC_DCOMP1] = {
	.primary = WM831X_AUXADC_INT,
	.reg = 1,
	.mask = WM831X_AUXADC_DCOMP1_EINT,
	},
	[WM831X_IRQ_AUXADC_DCOMP2] = {
	.primary = WM831X_AUXADC_INT,
	.reg = 1,
	.mask = WM831X_AUXADC_DCOMP2_EINT,
	},
	[WM831X_IRQ_AUXADC_DCOMP3] = {
	.primary = WM831X_AUXADC_INT,
	.reg = 1,
	.mask = WM831X_AUXADC_DCOMP3_EINT,
	},
	[WM831X_IRQ_AUXADC_DCOMP4] = {
	.primary = WM831X_AUXADC_INT,
	.reg = 1,
	.mask = WM831X_AUXADC_DCOMP4_EINT,
	},
	[WM831X_IRQ_CS1] = {
	.primary = WM831X_CS_INT,
	.reg = 2,
	.mask = WM831X_CS1_EINT,
	},
	[WM831X_IRQ_CS2] = {
	.primary = WM831X_CS_INT,
	.reg = 2,
	.mask = WM831X_CS2_EINT,
	},
	[WM831X_IRQ_HC_DC1] = {
	.primary = WM831X_HC_INT,
	.reg = 4,
	.mask = WM831X_HC_DC1_EINT,
	},
	[WM831X_IRQ_HC_DC2] = {
	.primary = WM831X_HC_INT,
	.reg = 4,
	.mask = WM831X_HC_DC2_EINT,
	},
	[WM831X_IRQ_UV_LDO1] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO1_EINT,
	},
	[WM831X_IRQ_UV_LDO2] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO2_EINT,
	},
	[WM831X_IRQ_UV_LDO3] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO3_EINT,
	},
	[WM831X_IRQ_UV_LDO4] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO4_EINT,
	},
	[WM831X_IRQ_UV_LDO5] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO5_EINT,
	},
	[WM831X_IRQ_UV_LDO6] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO6_EINT,
	},
	[WM831X_IRQ_UV_LDO7] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO7_EINT,
	},
	[WM831X_IRQ_UV_LDO8] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO8_EINT,
	},
	[WM831X_IRQ_UV_LDO9] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO9_EINT,
	},
	[WM831X_IRQ_UV_LDO10] = {
	.primary = WM831X_UV_INT,
	.reg = 3,
	.mask = WM831X_UV_LDO10_EINT,
	},
	[WM831X_IRQ_UV_DC1] = {
	.primary = WM831X_UV_INT,
	.reg = 4,
	.mask = WM831X_UV_DC1_EINT,
	},
	[WM831X_IRQ_UV_DC2] = {
	.primary = WM831X_UV_INT,
	.reg = 4,
	.mask = WM831X_UV_DC2_EINT,
	},
	[WM831X_IRQ_UV_DC3] = {
	.primary = WM831X_UV_INT,
	.reg = 4,
	.mask = WM831X_UV_DC3_EINT,
	},
	[WM831X_IRQ_UV_DC4] = {
	.primary = WM831X_UV_INT,
	.reg = 4,
	.mask = WM831X_UV_DC4_EINT,
	},
	};

	static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
	{
	return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
	}

	static inline int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data)
	{
	return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
	}

	static void __wm831x_enable_irq(struct wm831x *wm831x, int irq)
	{
	struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];

	wm831x->irq_masks[irq_data->reg - 1] &= ~irq_data->mask;
	wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data),
	wm831x->irq_masks[irq_data->reg - 1]);
	}

	void wm831x_enable_irq(struct wm831x *wm831x, int irq)
	{
	mutex_lock(&wm831x->irq_lock);
	__wm831x_enable_irq(wm831x, irq);
	mutex_unlock(&wm831x->irq_lock);
	}
	EXPORT_SYMBOL_GPL(wm831x_enable_irq);

	static void __wm831x_disable_irq(struct wm831x *wm831x, int irq)
	{
	struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];

	wm831x->irq_masks[irq_data->reg - 1] \|= irq_data->mask;
	wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data),
	wm831x->irq_masks[irq_data->reg - 1]);
	}

	void wm831x_disable_irq(struct wm831x *wm831x, int irq)
	{
	mutex_lock(&wm831x->irq_lock);
	__wm831x_disable_irq(wm831x, irq);
	mutex_unlock(&wm831x->irq_lock);
	}
	EXPORT_SYMBOL_GPL(wm831x_disable_irq);

	int wm831x_request_irq(struct wm831x *wm831x,
	unsigned int irq, irq_handler_t handler,
	unsigned long flags, const char *name,
	void *dev)
	{
	int ret = 0;

	if (irq < 0 \|\| irq >= WM831X_NUM_IRQS)
	return -EINVAL;

	mutex_lock(&wm831x->irq_lock);

	if (wm831x_irqs[irq].handler) {
	dev_err(wm831x->dev, "Already have handler for IRQ %d\n", irq);
	ret = -EINVAL;
	goto out;
	}

	wm831x_irqs[irq].handler = handler;
	wm831x_irqs[irq].handler_data = dev;

	__wm831x_enable_irq(wm831x, irq);

	out:
	mutex_unlock(&wm831x->irq_lock);

	return ret;
	}
	EXPORT_SYMBOL_GPL(wm831x_request_irq);

	void wm831x_free_irq(struct wm831x wm831x, unsigned int irq, void data)
	{
	if (irq < 0 \|\| irq >= WM831X_NUM_IRQS)
	return;

	mutex_lock(&wm831x->irq_lock);

	wm831x_irqs[irq].handler = NULL;
	wm831x_irqs[irq].handler_data = NULL;

	__wm831x_disable_irq(wm831x, irq);

	mutex_unlock(&wm831x->irq_lock);
	}
	EXPORT_SYMBOL_GPL(wm831x_free_irq);


	static void wm831x_handle_irq(struct wm831x *wm831x, int irq, int status)
	{
	struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];

	if (irq_data->handler) {
	irq_data->handler(irq, irq_data->handler_data);
	wm831x_reg_write(wm831x, irq_data_to_status_reg(irq_data),
	irq_data->mask);
	} else {
	dev_err(wm831x->dev, "Unhandled IRQ %d, masking\n", irq);
	__wm831x_disable_irq(wm831x, irq);
	}
	}

	/* Main interrupt handling occurs in a workqueue since we need
	* interrupts enabled to interact with the chip. */
	static void wm831x_irq_worker(struct work_struct *work)
	{
	struct wm831x *wm831x = container_of(work, struct wm831x, irq_work);
	unsigned int i;
	int primary;
	int status_regs[5];
	int read[5] = { 0 };
	int *status;

	primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
	if (primary < 0) {
	dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
	primary);
	goto out;
	}

	mutex_lock(&wm831x->irq_lock);

	for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
	int offset = wm831x_irqs[i].reg - 1;

	if (!(primary & wm831x_irqs[i].primary))
	continue;

	status = &status_regs[offset];

	/* Hopefully there should only be one register to read
	* each time otherwise we ought to do a block read. */
	if (!read[offset]) {
	*status = wm831x_reg_read(wm831x,
	irq_data_to_status_reg(&wm831x_irqs[i]));
	if (*status < 0) {
	dev_err(wm831x->dev,
	"Failed to read IRQ status: %d\n",
	*status);
	goto out_lock;
	}

	/* Mask out the disabled IRQs */
	*status &= ~wm831x->irq_masks[offset];
	read[offset] = 1;
	}

	if (*status & wm831x_irqs[i].mask)
	wm831x_handle_irq(wm831x, i, *status);
	}

	out_lock:
	mutex_unlock(&wm831x->irq_lock);
	out:
	enable_irq(wm831x->irq);
	}


	static irqreturn_t wm831x_cpu_irq(int irq, void *data)
	{
	struct wm831x *wm831x = data;

	/* Shut the interrupt to the CPU up and schedule the actual
	* handler; we can't check that the IRQ is asserted. */
	disable_irq_nosync(irq);

	queue_work(wm831x->irq_wq, &wm831x->irq_work);

	return IRQ_HANDLED;
	}

	int wm831x_irq_init(struct wm831x *wm831x, int irq)
	{
	int i, ret;

	mutex_init(&wm831x->irq_lock);

	if (!irq) {
	dev_warn(wm831x->dev,
	"No interrupt specified - functionality limited\n");
	return 0;
	}


	wm831x->irq_wq = create_singlethread_workqueue("wm831x-irq");
	if (!wm831x->irq_wq) {
	dev_err(wm831x->dev, "Failed to allocate IRQ worker\n");
	return -ESRCH;
	}

	wm831x->irq = irq;
	INIT_WORK(&wm831x->irq_work, wm831x_irq_worker);

	/* Mask the individual interrupt sources */
	for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks); i++) {
	wm831x->irq_masks[i] = 0xffff;
	wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
	0xffff);
	}

	/* Enable top level interrupts, we mask at secondary level */
	wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);

	/* We're good to go. We set IRQF_SHARED since there's a
	* chance the driver will interoperate with another driver but
	* the need to disable the IRQ while handing via I2C/SPI means
	* that this may break and performance will be impacted. If
	* this does happen it's a hardware design issue and the only
	* other alternative would be polling.
	*/
	ret = request_irq(irq, wm831x_cpu_irq, IRQF_TRIGGER_LOW \| IRQF_SHARED,
	"wm831x", wm831x);
	if (ret != 0) {
	dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
	irq, ret);
	return ret;
	}

	return 0;
	}

	void wm831x_irq_exit(struct wm831x *wm831x)
	{
	if (wm831x->irq)
	free_irq(wm831x->irq, wm831x);
	}