drivers/mfd/max8997-irq.c - kernel/msm-4.19 - Gitiles

 /*
  * max8997-irq.c - Interrupt controller support for MAX8997
  *
  * Copyright (C) 2011 Samsung Electronics Co.Ltd
  * MyungJoo Ham <myungjoo.ham@samsung.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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * This driver is based on max8998-irq.c
  */

 #include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/max8997.h>
 #include <linux/mfd/max8997-private.h>

 static const u8 max8997_mask_reg[] = {
 	[PMIC_INT1] = MAX8997_REG_INT1MSK,
 	[PMIC_INT2] = MAX8997_REG_INT2MSK,
 	[PMIC_INT3] = MAX8997_REG_INT3MSK,
 	[PMIC_INT4] = MAX8997_REG_INT4MSK,
 	[FUEL_GAUGE] = MAX8997_REG_INVALID,
 	[MUIC_INT1] = MAX8997_MUIC_REG_INTMASK1,
 	[MUIC_INT2] = MAX8997_MUIC_REG_INTMASK2,
 	[MUIC_INT3] = MAX8997_MUIC_REG_INTMASK3,
 	[GPIO_LOW] = MAX8997_REG_INVALID,
 	[GPIO_HI] = MAX8997_REG_INVALID,
 	[FLASH_STATUS] = MAX8997_REG_INVALID,
 };

 static struct i2c_client *get_i2c(struct max8997_dev *max8997,
 				enum max8997_irq_source src)
 {
 	switch (src) {
 	case PMIC_INT1 ... PMIC_INT4:
 		return max8997->i2c;
 	case FUEL_GAUGE:
 		return NULL;
 	case MUIC_INT1 ... MUIC_INT3:
 		return max8997->muic;
 	case GPIO_LOW ... GPIO_HI:
 		return max8997->i2c;
 	case FLASH_STATUS:
 		return max8997->i2c;
 	default:
 		return ERR_PTR(-EINVAL);
 	}
 }

 struct max8997_irq_data {
 	int mask;
 	enum max8997_irq_source group;
 };

 #define DECLARE_IRQ(idx, _group, _mask)		\
 	[(idx)] = { .group = (_group), .mask = (_mask) }
 static const struct max8997_irq_data max8997_irqs[] = {
 	DECLARE_IRQ(MAX8997_PMICIRQ_PWRONR,	PMIC_INT1, 1 << 0),
 	DECLARE_IRQ(MAX8997_PMICIRQ_PWRONF,	PMIC_INT1, 1 << 1),
 	DECLARE_IRQ(MAX8997_PMICIRQ_PWRON1SEC,	PMIC_INT1, 1 << 3),
 	DECLARE_IRQ(MAX8997_PMICIRQ_JIGONR,	PMIC_INT1, 1 << 4),
 	DECLARE_IRQ(MAX8997_PMICIRQ_JIGONF,	PMIC_INT1, 1 << 5),
 	DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT2,	PMIC_INT1, 1 << 6),
 	DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT1,	PMIC_INT1, 1 << 7),

 	DECLARE_IRQ(MAX8997_PMICIRQ_JIGR,	PMIC_INT2, 1 << 0),
 	DECLARE_IRQ(MAX8997_PMICIRQ_JIGF,	PMIC_INT2, 1 << 1),
 	DECLARE_IRQ(MAX8997_PMICIRQ_MR,		PMIC_INT2, 1 << 2),
 	DECLARE_IRQ(MAX8997_PMICIRQ_DVS1OK,	PMIC_INT2, 1 << 3),
 	DECLARE_IRQ(MAX8997_PMICIRQ_DVS2OK,	PMIC_INT2, 1 << 4),
 	DECLARE_IRQ(MAX8997_PMICIRQ_DVS3OK,	PMIC_INT2, 1 << 5),
 	DECLARE_IRQ(MAX8997_PMICIRQ_DVS4OK,	PMIC_INT2, 1 << 6),

 	DECLARE_IRQ(MAX8997_PMICIRQ_CHGINS,	PMIC_INT3, 1 << 0),
 	DECLARE_IRQ(MAX8997_PMICIRQ_CHGRM,	PMIC_INT3, 1 << 1),
 	DECLARE_IRQ(MAX8997_PMICIRQ_DCINOVP,	PMIC_INT3, 1 << 2),
 	DECLARE_IRQ(MAX8997_PMICIRQ_TOPOFFR,	PMIC_INT3, 1 << 3),
 	DECLARE_IRQ(MAX8997_PMICIRQ_CHGRSTF,	PMIC_INT3, 1 << 5),
 	DECLARE_IRQ(MAX8997_PMICIRQ_MBCHGTMEXPD,	PMIC_INT3, 1 << 7),

 	DECLARE_IRQ(MAX8997_PMICIRQ_RTC60S,	PMIC_INT4, 1 << 0),
 	DECLARE_IRQ(MAX8997_PMICIRQ_RTCA1,	PMIC_INT4, 1 << 1),
 	DECLARE_IRQ(MAX8997_PMICIRQ_RTCA2,	PMIC_INT4, 1 << 2),
 	DECLARE_IRQ(MAX8997_PMICIRQ_SMPL_INT,	PMIC_INT4, 1 << 3),
 	DECLARE_IRQ(MAX8997_PMICIRQ_RTC1S,	PMIC_INT4, 1 << 4),
 	DECLARE_IRQ(MAX8997_PMICIRQ_WTSR,	PMIC_INT4, 1 << 5),

 	DECLARE_IRQ(MAX8997_MUICIRQ_ADCError,	MUIC_INT1, 1 << 2),
 	DECLARE_IRQ(MAX8997_MUICIRQ_ADCLow,	MUIC_INT1, 1 << 1),
 	DECLARE_IRQ(MAX8997_MUICIRQ_ADC,	MUIC_INT1, 1 << 0),

 	DECLARE_IRQ(MAX8997_MUICIRQ_VBVolt,	MUIC_INT2, 1 << 4),
 	DECLARE_IRQ(MAX8997_MUICIRQ_DBChg,	MUIC_INT2, 1 << 3),
 	DECLARE_IRQ(MAX8997_MUICIRQ_DCDTmr,	MUIC_INT2, 1 << 2),
 	DECLARE_IRQ(MAX8997_MUICIRQ_ChgDetRun,	MUIC_INT2, 1 << 1),
 	DECLARE_IRQ(MAX8997_MUICIRQ_ChgTyp,	MUIC_INT2, 1 << 0),

 	DECLARE_IRQ(MAX8997_MUICIRQ_OVP,	MUIC_INT3, 1 << 2),
 };

 static void max8997_irq_lock(struct irq_data *data)
 {
 	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);

 	mutex_lock(&max8997->irqlock);
 }

 static void max8997_irq_sync_unlock(struct irq_data *data)
 {
 	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
 	int i;

 	for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
 		u8 mask_reg = max8997_mask_reg[i];
 		struct i2c_client *i2c = get_i2c(max8997, i);

 		if (mask_reg == MAX8997_REG_INVALID ||
 				IS_ERR_OR_NULL(i2c))
 			continue;
 		max8997->irq_masks_cache[i] = max8997->irq_masks_cur[i];

 		max8997_write_reg(i2c, max8997_mask_reg[i],
 				max8997->irq_masks_cur[i]);
 	}

 	mutex_unlock(&max8997->irqlock);
 }

 static const inline struct max8997_irq_data *
 irq_to_max8997_irq(struct max8997_dev *max8997, int irq)
 {
 	struct irq_data *data = irq_get_irq_data(irq);
 	return &max8997_irqs[data->hwirq];
 }

 static void max8997_irq_mask(struct irq_data *data)
 {
 	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
 	const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
 								data->irq);

 	max8997->irq_masks_cur[irq_data->group] |= irq_data->mask;
 }

 static void max8997_irq_unmask(struct irq_data *data)
 {
 	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
 	const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
 								data->irq);

 	max8997->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
 }

 static struct irq_chip max8997_irq_chip = {
 	.name			= "max8997",
 	.irq_bus_lock		= max8997_irq_lock,
 	.irq_bus_sync_unlock	= max8997_irq_sync_unlock,
 	.irq_mask		= max8997_irq_mask,
 	.irq_unmask		= max8997_irq_unmask,
 };

 #define MAX8997_IRQSRC_PMIC		(1 << 1)
 #define MAX8997_IRQSRC_FUELGAUGE	(1 << 2)
 #define MAX8997_IRQSRC_MUIC		(1 << 3)
 #define MAX8997_IRQSRC_GPIO		(1 << 4)
 #define MAX8997_IRQSRC_FLASH		(1 << 5)
 static irqreturn_t max8997_irq_thread(int irq, void *data)
 {
 	struct max8997_dev *max8997 = data;
 	u8 irq_reg[MAX8997_IRQ_GROUP_NR] = {};
 	u8 irq_src;
 	int ret;
 	int i, cur_irq;

 	ret = max8997_read_reg(max8997->i2c, MAX8997_REG_INTSRC, &irq_src);
 	if (ret < 0) {
 		dev_err(max8997->dev, "Failed to read interrupt source: %d\n",
 				ret);
 		return IRQ_NONE;
 	}

 	if (irq_src & MAX8997_IRQSRC_PMIC) {
 		/* PMIC INT1 ~ INT4 */
 		max8997_bulk_read(max8997->i2c, MAX8997_REG_INT1, 4,
 				&irq_reg[PMIC_INT1]);
 	}
 	if (irq_src & MAX8997_IRQSRC_FUELGAUGE) {
 		/*
 		 * TODO: FUEL GAUGE
 		 *
 		 * This is to be supported by Max17042 driver. When
 		 * an interrupt incurs here, it should be relayed to a
 		 * Max17042 device that is connected (probably by
 		 * platform-data). However, we do not have interrupt
 		 * handling in Max17042 driver currently. The Max17042 IRQ
 		 * driver should be ready to be used as a stand-alone device and
 		 * a Max8997-dependent device. Because it is not ready in
 		 * Max17042-side and it is not too critical in operating
 		 * Max8997, we do not implement this in initial releases.
 		 */
 		irq_reg[FUEL_GAUGE] = 0;
 	}
 	if (irq_src & MAX8997_IRQSRC_MUIC) {
 		/* MUIC INT1 ~ INT3 */
 		max8997_bulk_read(max8997->muic, MAX8997_MUIC_REG_INT1, 3,
 				&irq_reg[MUIC_INT1]);
 	}
 	if (irq_src & MAX8997_IRQSRC_GPIO) {
 		/* GPIO Interrupt */
 		u8 gpio_info[MAX8997_NUM_GPIO];

 		irq_reg[GPIO_LOW] = 0;
 		irq_reg[GPIO_HI] = 0;

 		max8997_bulk_read(max8997->i2c, MAX8997_REG_GPIOCNTL1,
 				MAX8997_NUM_GPIO, gpio_info);
 		for (i = 0; i < MAX8997_NUM_GPIO; i++) {
 			bool interrupt = false;

 			switch (gpio_info[i] & MAX8997_GPIO_INT_MASK) {
 			case MAX8997_GPIO_INT_BOTH:
 				if (max8997->gpio_status[i] != gpio_info[i])
 					interrupt = true;
 				break;
 			case MAX8997_GPIO_INT_RISE:
 				if ((max8997->gpio_status[i] != gpio_info[i]) &&
 				    (gpio_info[i] & MAX8997_GPIO_DATA_MASK))
 					interrupt = true;
 				break;
 			case MAX8997_GPIO_INT_FALL:
 				if ((max8997->gpio_status[i] != gpio_info[i]) &&
 				    !(gpio_info[i] & MAX8997_GPIO_DATA_MASK))
 					interrupt = true;
 				break;
 			default:
 				break;
 			}

 			if (interrupt) {
 				if (i < 8)
 					irq_reg[GPIO_LOW] |= (1 << i);
 				else
 					irq_reg[GPIO_HI] |= (1 << (i - 8));
 			}

 		}
 	}
 	if (irq_src & MAX8997_IRQSRC_FLASH) {
 		/* Flash Status Interrupt */
 		ret = max8997_read_reg(max8997->i2c, MAX8997_REG_FLASHSTATUS,
 				&irq_reg[FLASH_STATUS]);
 	}

 	/* Apply masking */
 	for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++)
 		irq_reg[i] &= ~max8997->irq_masks_cur[i];

 	/* Report */
 	for (i = 0; i < MAX8997_IRQ_NR; i++) {
 		if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask) {
 			cur_irq = irq_find_mapping(max8997->irq_domain, i);
 			if (cur_irq)
 				handle_nested_irq(cur_irq);
 		}
 	}

 	return IRQ_HANDLED;
 }

 int max8997_irq_resume(struct max8997_dev *max8997)
 {
 	if (max8997->irq && max8997->irq_domain)
 		max8997_irq_thread(0, max8997);
 	return 0;
 }

 static int max8997_irq_domain_map(struct irq_domain *d, unsigned int irq,
 					irq_hw_number_t hw)
 {
 	struct max8997_dev *max8997 = d->host_data;

 	irq_set_chip_data(irq, max8997);
 	irq_set_chip_and_handler(irq, &max8997_irq_chip, handle_edge_irq);
 	irq_set_nested_thread(irq, 1);
 #ifdef CONFIG_ARM
 	set_irq_flags(irq, IRQF_VALID);
 #else
 	irq_set_noprobe(irq);
 #endif
 	return 0;
 }

 static struct irq_domain_ops max8997_irq_domain_ops = {
 	.map = max8997_irq_domain_map,
 };

 int max8997_irq_init(struct max8997_dev *max8997)
 {
 	struct irq_domain *domain;
 	int i;
 	int ret;
 	u8 val;

 	if (!max8997->irq) {
 		dev_warn(max8997->dev, "No interrupt specified.\n");
 		return 0;
 	}

 	mutex_init(&max8997->irqlock);

 	/* Mask individual interrupt sources */
 	for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
 		struct i2c_client *i2c;

 		max8997->irq_masks_cur[i] = 0xff;
 		max8997->irq_masks_cache[i] = 0xff;
 		i2c = get_i2c(max8997, i);

 		if (IS_ERR_OR_NULL(i2c))
 			continue;
 		if (max8997_mask_reg[i] == MAX8997_REG_INVALID)
 			continue;

 		max8997_write_reg(i2c, max8997_mask_reg[i], 0xff);
 	}

 	for (i = 0; i < MAX8997_NUM_GPIO; i++) {
 		max8997->gpio_status[i] = (max8997_read_reg(max8997->i2c,
 						MAX8997_REG_GPIOCNTL1 + i,
 						&val)
 					& MAX8997_GPIO_DATA_MASK) ?
 					true : false;
 	}

 	domain = irq_domain_add_linear(NULL, MAX8997_IRQ_NR,
 					&max8997_irq_domain_ops, max8997);
 	if (!domain) {
 		dev_err(max8997->dev, "could not create irq domain\n");
 		return -ENODEV;
 	}
 	max8997->irq_domain = domain;

 	ret = request_threaded_irq(max8997->irq, NULL, max8997_irq_thread,
 			IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 			"max8997-irq", max8997);

 	if (ret) {
 		dev_err(max8997->dev, "Failed to request IRQ %d: %d\n",
 				max8997->irq, ret);
 		return ret;
 	}

 	if (!max8997->ono)
 		return 0;

 	ret = request_threaded_irq(max8997->ono, NULL, max8997_irq_thread,
 			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 			IRQF_ONESHOT, "max8997-ono", max8997);

 	if (ret)
 		dev_err(max8997->dev, "Failed to request ono-IRQ %d: %d\n",
 				max8997->ono, ret);

 	return 0;
 }

 void max8997_irq_exit(struct max8997_dev *max8997)
 {
 	if (max8997->ono)
 		free_irq(max8997->ono, max8997);

 	if (max8997->irq)
 		free_irq(max8997->irq, max8997);
 }
	/*
	* max8997-irq.c - Interrupt controller support for MAX8997
	*
	* Copyright (C) 2011 Samsung Electronics Co.Ltd
	* MyungJoo Ham <myungjoo.ham@samsung.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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* This driver is based on max8998-irq.c
	*/

	#include <linux/err.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/mfd/max8997.h>
	#include <linux/mfd/max8997-private.h>

	static const u8 max8997_mask_reg[] = {
	[PMIC_INT1] = MAX8997_REG_INT1MSK,
	[PMIC_INT2] = MAX8997_REG_INT2MSK,
	[PMIC_INT3] = MAX8997_REG_INT3MSK,
	[PMIC_INT4] = MAX8997_REG_INT4MSK,
	[FUEL_GAUGE] = MAX8997_REG_INVALID,
	[MUIC_INT1] = MAX8997_MUIC_REG_INTMASK1,
	[MUIC_INT2] = MAX8997_MUIC_REG_INTMASK2,
	[MUIC_INT3] = MAX8997_MUIC_REG_INTMASK3,
	[GPIO_LOW] = MAX8997_REG_INVALID,
	[GPIO_HI] = MAX8997_REG_INVALID,
	[FLASH_STATUS] = MAX8997_REG_INVALID,
	};

	static struct i2c_client get_i2c(struct max8997_dev max8997,
	enum max8997_irq_source src)
	{
	switch (src) {
	case PMIC_INT1 ... PMIC_INT4:
	return max8997->i2c;
	case FUEL_GAUGE:
	return NULL;
	case MUIC_INT1 ... MUIC_INT3:
	return max8997->muic;
	case GPIO_LOW ... GPIO_HI:
	return max8997->i2c;
	case FLASH_STATUS:
	return max8997->i2c;
	default:
	return ERR_PTR(-EINVAL);
	}
	}

	struct max8997_irq_data {
	int mask;
	enum max8997_irq_source group;
	};

	#define DECLARE_IRQ(idx, _group, _mask) \
	[(idx)] = { .group = (_group), .mask = (_mask) }
	static const struct max8997_irq_data max8997_irqs[] = {
	DECLARE_IRQ(MAX8997_PMICIRQ_PWRONR, PMIC_INT1, 1 << 0),
	DECLARE_IRQ(MAX8997_PMICIRQ_PWRONF, PMIC_INT1, 1 << 1),
	DECLARE_IRQ(MAX8997_PMICIRQ_PWRON1SEC, PMIC_INT1, 1 << 3),
	DECLARE_IRQ(MAX8997_PMICIRQ_JIGONR, PMIC_INT1, 1 << 4),
	DECLARE_IRQ(MAX8997_PMICIRQ_JIGONF, PMIC_INT1, 1 << 5),
	DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT2, PMIC_INT1, 1 << 6),
	DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT1, PMIC_INT1, 1 << 7),

	DECLARE_IRQ(MAX8997_PMICIRQ_JIGR, PMIC_INT2, 1 << 0),
	DECLARE_IRQ(MAX8997_PMICIRQ_JIGF, PMIC_INT2, 1 << 1),
	DECLARE_IRQ(MAX8997_PMICIRQ_MR, PMIC_INT2, 1 << 2),
	DECLARE_IRQ(MAX8997_PMICIRQ_DVS1OK, PMIC_INT2, 1 << 3),
	DECLARE_IRQ(MAX8997_PMICIRQ_DVS2OK, PMIC_INT2, 1 << 4),
	DECLARE_IRQ(MAX8997_PMICIRQ_DVS3OK, PMIC_INT2, 1 << 5),
	DECLARE_IRQ(MAX8997_PMICIRQ_DVS4OK, PMIC_INT2, 1 << 6),

	DECLARE_IRQ(MAX8997_PMICIRQ_CHGINS, PMIC_INT3, 1 << 0),
	DECLARE_IRQ(MAX8997_PMICIRQ_CHGRM, PMIC_INT3, 1 << 1),
	DECLARE_IRQ(MAX8997_PMICIRQ_DCINOVP, PMIC_INT3, 1 << 2),
	DECLARE_IRQ(MAX8997_PMICIRQ_TOPOFFR, PMIC_INT3, 1 << 3),
	DECLARE_IRQ(MAX8997_PMICIRQ_CHGRSTF, PMIC_INT3, 1 << 5),
	DECLARE_IRQ(MAX8997_PMICIRQ_MBCHGTMEXPD, PMIC_INT3, 1 << 7),

	DECLARE_IRQ(MAX8997_PMICIRQ_RTC60S, PMIC_INT4, 1 << 0),
	DECLARE_IRQ(MAX8997_PMICIRQ_RTCA1, PMIC_INT4, 1 << 1),
	DECLARE_IRQ(MAX8997_PMICIRQ_RTCA2, PMIC_INT4, 1 << 2),
	DECLARE_IRQ(MAX8997_PMICIRQ_SMPL_INT, PMIC_INT4, 1 << 3),
	DECLARE_IRQ(MAX8997_PMICIRQ_RTC1S, PMIC_INT4, 1 << 4),
	DECLARE_IRQ(MAX8997_PMICIRQ_WTSR, PMIC_INT4, 1 << 5),

	DECLARE_IRQ(MAX8997_MUICIRQ_ADCError, MUIC_INT1, 1 << 2),
	DECLARE_IRQ(MAX8997_MUICIRQ_ADCLow, MUIC_INT1, 1 << 1),
	DECLARE_IRQ(MAX8997_MUICIRQ_ADC, MUIC_INT1, 1 << 0),

	DECLARE_IRQ(MAX8997_MUICIRQ_VBVolt, MUIC_INT2, 1 << 4),
	DECLARE_IRQ(MAX8997_MUICIRQ_DBChg, MUIC_INT2, 1 << 3),
	DECLARE_IRQ(MAX8997_MUICIRQ_DCDTmr, MUIC_INT2, 1 << 2),
	DECLARE_IRQ(MAX8997_MUICIRQ_ChgDetRun, MUIC_INT2, 1 << 1),
	DECLARE_IRQ(MAX8997_MUICIRQ_ChgTyp, MUIC_INT2, 1 << 0),

	DECLARE_IRQ(MAX8997_MUICIRQ_OVP, MUIC_INT3, 1 << 2),
	};

	static void max8997_irq_lock(struct irq_data *data)
	{
	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);

	mutex_lock(&max8997->irqlock);
	}

	static void max8997_irq_sync_unlock(struct irq_data *data)
	{
	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
	int i;

	for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
	u8 mask_reg = max8997_mask_reg[i];
	struct i2c_client *i2c = get_i2c(max8997, i);

	if (mask_reg == MAX8997_REG_INVALID \|\|
	IS_ERR_OR_NULL(i2c))
	continue;
	max8997->irq_masks_cache[i] = max8997->irq_masks_cur[i];

	max8997_write_reg(i2c, max8997_mask_reg[i],
	max8997->irq_masks_cur[i]);
	}

	mutex_unlock(&max8997->irqlock);
	}

	static const inline struct max8997_irq_data *
	irq_to_max8997_irq(struct max8997_dev *max8997, int irq)
	{
	struct irq_data *data = irq_get_irq_data(irq);
	return &max8997_irqs[data->hwirq];
	}

	static void max8997_irq_mask(struct irq_data *data)
	{
	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
	const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
	data->irq);

	max8997->irq_masks_cur[irq_data->group] \|= irq_data->mask;
	}

	static void max8997_irq_unmask(struct irq_data *data)
	{
	struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
	const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
	data->irq);

	max8997->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
	}

	static struct irq_chip max8997_irq_chip = {
	.name = "max8997",
	.irq_bus_lock = max8997_irq_lock,
	.irq_bus_sync_unlock = max8997_irq_sync_unlock,
	.irq_mask = max8997_irq_mask,
	.irq_unmask = max8997_irq_unmask,
	};

	#define MAX8997_IRQSRC_PMIC (1 << 1)
	#define MAX8997_IRQSRC_FUELGAUGE (1 << 2)
	#define MAX8997_IRQSRC_MUIC (1 << 3)
	#define MAX8997_IRQSRC_GPIO (1 << 4)
	#define MAX8997_IRQSRC_FLASH (1 << 5)
	static irqreturn_t max8997_irq_thread(int irq, void *data)
	{
	struct max8997_dev *max8997 = data;
	u8 irq_reg[MAX8997_IRQ_GROUP_NR] = {};
	u8 irq_src;
	int ret;
	int i, cur_irq;

	ret = max8997_read_reg(max8997->i2c, MAX8997_REG_INTSRC, &irq_src);
	if (ret < 0) {
	dev_err(max8997->dev, "Failed to read interrupt source: %d\n",
	ret);
	return IRQ_NONE;
	}

	if (irq_src & MAX8997_IRQSRC_PMIC) {
	/* PMIC INT1 ~ INT4 */
	max8997_bulk_read(max8997->i2c, MAX8997_REG_INT1, 4,
	&irq_reg[PMIC_INT1]);
	}
	if (irq_src & MAX8997_IRQSRC_FUELGAUGE) {
	/*
	* TODO: FUEL GAUGE
	*
	* This is to be supported by Max17042 driver. When
	* an interrupt incurs here, it should be relayed to a
	* Max17042 device that is connected (probably by
	* platform-data). However, we do not have interrupt
	* handling in Max17042 driver currently. The Max17042 IRQ
	* driver should be ready to be used as a stand-alone device and
	* a Max8997-dependent device. Because it is not ready in
	* Max17042-side and it is not too critical in operating
	* Max8997, we do not implement this in initial releases.
	*/
	irq_reg[FUEL_GAUGE] = 0;
	}
	if (irq_src & MAX8997_IRQSRC_MUIC) {
	/* MUIC INT1 ~ INT3 */
	max8997_bulk_read(max8997->muic, MAX8997_MUIC_REG_INT1, 3,
	&irq_reg[MUIC_INT1]);
	}
	if (irq_src & MAX8997_IRQSRC_GPIO) {
	/* GPIO Interrupt */
	u8 gpio_info[MAX8997_NUM_GPIO];

	irq_reg[GPIO_LOW] = 0;
	irq_reg[GPIO_HI] = 0;

	max8997_bulk_read(max8997->i2c, MAX8997_REG_GPIOCNTL1,
	MAX8997_NUM_GPIO, gpio_info);
	for (i = 0; i < MAX8997_NUM_GPIO; i++) {
	bool interrupt = false;

	switch (gpio_info[i] & MAX8997_GPIO_INT_MASK) {
	case MAX8997_GPIO_INT_BOTH:
	if (max8997->gpio_status[i] != gpio_info[i])
	interrupt = true;
	break;
	case MAX8997_GPIO_INT_RISE:
	if ((max8997->gpio_status[i] != gpio_info[i]) &&
	(gpio_info[i] & MAX8997_GPIO_DATA_MASK))
	interrupt = true;
	break;
	case MAX8997_GPIO_INT_FALL:
	if ((max8997->gpio_status[i] != gpio_info[i]) &&
	!(gpio_info[i] & MAX8997_GPIO_DATA_MASK))
	interrupt = true;
	break;
	default:
	break;
	}

	if (interrupt) {
	if (i < 8)
	irq_reg[GPIO_LOW] \|= (1 << i);
	else
	irq_reg[GPIO_HI] \|= (1 << (i - 8));
	}

	}
	}
	if (irq_src & MAX8997_IRQSRC_FLASH) {
	/* Flash Status Interrupt */
	ret = max8997_read_reg(max8997->i2c, MAX8997_REG_FLASHSTATUS,
	&irq_reg[FLASH_STATUS]);
	}

	/* Apply masking */
	for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++)
	irq_reg[i] &= ~max8997->irq_masks_cur[i];

	/* Report */
	for (i = 0; i < MAX8997_IRQ_NR; i++) {
	if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask) {
	cur_irq = irq_find_mapping(max8997->irq_domain, i);
	if (cur_irq)
	handle_nested_irq(cur_irq);
	}
	}

	return IRQ_HANDLED;
	}

	int max8997_irq_resume(struct max8997_dev *max8997)
	{
	if (max8997->irq && max8997->irq_domain)
	max8997_irq_thread(0, max8997);
	return 0;
	}

	static int max8997_irq_domain_map(struct irq_domain *d, unsigned int irq,
	irq_hw_number_t hw)
	{
	struct max8997_dev *max8997 = d->host_data;

	irq_set_chip_data(irq, max8997);
	irq_set_chip_and_handler(irq, &max8997_irq_chip, handle_edge_irq);
	irq_set_nested_thread(irq, 1);
	#ifdef CONFIG_ARM
	set_irq_flags(irq, IRQF_VALID);
	#else
	irq_set_noprobe(irq);
	#endif
	return 0;
	}

	static struct irq_domain_ops max8997_irq_domain_ops = {
	.map = max8997_irq_domain_map,
	};

	int max8997_irq_init(struct max8997_dev *max8997)
	{
	struct irq_domain *domain;
	int i;
	int ret;
	u8 val;

	if (!max8997->irq) {
	dev_warn(max8997->dev, "No interrupt specified.\n");
	return 0;
	}

	mutex_init(&max8997->irqlock);

	/* Mask individual interrupt sources */
	for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
	struct i2c_client *i2c;

	max8997->irq_masks_cur[i] = 0xff;
	max8997->irq_masks_cache[i] = 0xff;
	i2c = get_i2c(max8997, i);

	if (IS_ERR_OR_NULL(i2c))
	continue;
	if (max8997_mask_reg[i] == MAX8997_REG_INVALID)
	continue;

	max8997_write_reg(i2c, max8997_mask_reg[i], 0xff);
	}

	for (i = 0; i < MAX8997_NUM_GPIO; i++) {
	max8997->gpio_status[i] = (max8997_read_reg(max8997->i2c,
	MAX8997_REG_GPIOCNTL1 + i,
	&val)
	& MAX8997_GPIO_DATA_MASK) ?
	true : false;
	}

	domain = irq_domain_add_linear(NULL, MAX8997_IRQ_NR,
	&max8997_irq_domain_ops, max8997);
	if (!domain) {
	dev_err(max8997->dev, "could not create irq domain\n");
	return -ENODEV;
	}
	max8997->irq_domain = domain;

	ret = request_threaded_irq(max8997->irq, NULL, max8997_irq_thread,
	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	"max8997-irq", max8997);

	if (ret) {
	dev_err(max8997->dev, "Failed to request IRQ %d: %d\n",
	max8997->irq, ret);
	return ret;
	}

	if (!max8997->ono)
	return 0;

	ret = request_threaded_irq(max8997->ono, NULL, max8997_irq_thread,
	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
	IRQF_ONESHOT, "max8997-ono", max8997);

	if (ret)
	dev_err(max8997->dev, "Failed to request ono-IRQ %d: %d\n",
	max8997->ono, ret);

	return 0;
	}

	void max8997_irq_exit(struct max8997_dev *max8997)
	{
	if (max8997->ono)
	free_irq(max8997->ono, max8997);

	if (max8997->irq)
	free_irq(max8997->irq, max8997);
	}