drivers/mfd/s2mps17_irq.c - LeafOS-Devices/android_kernel_samsung_universal7904 - Gitiles

 /*
  * s2mps17-irq.c - Interrupt controller support for S2MPS17
  *
  * Copyright (C) 2016 Samsung Electronics Co.Ltd
  *
  * 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
  *
 */

 #include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/gpio.h>
 #include <linux/mfd/samsung/s2mps17.h>
 #include <linux/mfd/samsung/s2mps17-private.h>

 static const u8 s2mps17_mask_reg[] = {
 	/* TODO: Need to check other INTMASK */
 	[PMIC_INT1] = 	S2MPS17_PMIC_REG_INT1M,
 	[PMIC_INT2] =	S2MPS17_PMIC_REG_INT2M,
 	[PMIC_INT3] = 	S2MPS17_PMIC_REG_INT3M,
 	[PMIC_INT4] = 	S2MPS17_PMIC_REG_INT4M,
 	[PMIC_INT5] =	S2MPS17_PMIC_REG_INT5M,
 	[PMIC_INT6] = 	S2MPS17_PMIC_REG_INT6M,
 };

 static struct i2c_client *get_i2c(struct s2mps17_dev *s2mps17,
 				enum s2mps17_irq_source src)
 {
 	switch (src) {
 	case PMIC_INT1 ... PMIC_INT6:
 		return s2mps17->pmic;
 	default:
 		return ERR_PTR(-EINVAL);
 	}
 }

 struct s2mps17_irq_data {
 	int mask;
 	enum s2mps17_irq_source group;
 };

 #define DECLARE_IRQ(idx, _group, _mask)		\
 	[(idx)] = { .group = (_group), .mask = (_mask) }
 static const struct s2mps17_irq_data s2mps17_irqs[] = {
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_PWRONR_INT1,	PMIC_INT1, 1 << 1),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_PWRONF_INT1,	PMIC_INT1, 1 << 0),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_JIGONBF_INT1,	PMIC_INT1, 1 << 2),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_JIGONBR_INT1,	PMIC_INT1, 1 << 3),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_ACOKBF_INT1,	PMIC_INT1, 1 << 4),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_ACOKBR_INT1,	PMIC_INT1, 1 << 5),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_PWRON1S_INT1,	PMIC_INT1, 1 << 6),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_MRB_INT1,		PMIC_INT1, 1 << 7),

 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTC60S_INT2,	PMIC_INT2, 1 << 0),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTCA1_INT2,	PMIC_INT2, 1 << 1),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTCA0_INT2,	PMIC_INT2, 1 << 2),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_SMPL_INT2,		PMIC_INT2, 1 << 3),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTC1S_INT2,	PMIC_INT2, 1 << 4),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_WTSR_INT2,		PMIC_INT2, 1 << 5),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_WRSTB_INT2,	PMIC_INT2, 1 << 7),

 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_120C_INT3,		PMIC_INT3, 1 << 0),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_140C_INT3,		PMIC_INT3, 1 << 1),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_TSD_INT3,		PMIC_INT3, 1 << 2),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_ADCDONE_INT3,	PMIC_INT3, 1 << 7),

 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC0_INT4,		PMIC_INT4, 1 << 0),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC1_INT4,		PMIC_INT4, 1 << 1),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC2_INT4,		PMIC_INT4, 1 << 2),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC3_INT4,		PMIC_INT4, 1 << 3),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC4_INT4,		PMIC_INT4, 1 << 4),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC5_INT4,		PMIC_INT4, 1 << 5),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC6_INT4,		PMIC_INT4, 1 << 6),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC7_INT4,		PMIC_INT4, 1 << 7),

 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB1_INT5,	PMIC_INT5, 1 << 0),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB2_INT5,	PMIC_INT5, 1 << 1),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB3_INT5,	PMIC_INT5, 1 << 2),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB4_INT5,	PMIC_INT5, 1 << 3),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB5_INT5,	PMIC_INT5, 1 << 4),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB6_INT5,	PMIC_INT5, 1 << 5),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB7_INT5,	PMIC_INT5, 1 << 6),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB8_INT5,	PMIC_INT5, 1 << 7),

 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB9_INT6,	PMIC_INT6, 1 << 0),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB10_INT6,	PMIC_INT6, 1 << 1),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB11_INT6,	PMIC_INT6, 1 << 2),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB12_INT6,	PMIC_INT6, 1 << 3),
 	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPBB_INT6,	PMIC_INT6, 1 << 4),
 };

 static void s2mps17_irq_lock(struct irq_data *data)
 {
 	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);

 	mutex_lock(&s2mps17->irqlock);
 }

 static void s2mps17_irq_sync_unlock(struct irq_data *data)
 {
 	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);
 	int i;

 	for (i = 0; i < S2MPS17_IRQ_GROUP_NR; i++) {
 		u8 mask_reg = s2mps17_mask_reg[i];
 		struct i2c_client *i2c = get_i2c(s2mps17, i);

 		if (mask_reg == S2MPS17_REG_INVALID ||
 				IS_ERR_OR_NULL(i2c))
 			continue;
 		s2mps17->irq_masks_cache[i] = s2mps17->irq_masks_cur[i];

 		s2mps17_write_reg(i2c, s2mps17_mask_reg[i],
 				s2mps17->irq_masks_cur[i]);
 	}

 	mutex_unlock(&s2mps17->irqlock);
 }

 static const inline struct s2mps17_irq_data *
 irq_to_s2mps17_irq(struct s2mps17_dev *s2mps17, int irq)
 {
 	return &s2mps17_irqs[irq - s2mps17->irq_base];
 }

 static void s2mps17_irq_mask(struct irq_data *data)
 {
 	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);
 	const struct s2mps17_irq_data *irq_data =
 	    irq_to_s2mps17_irq(s2mps17, data->irq);

 	if (irq_data->group >= S2MPS17_IRQ_GROUP_NR)
 		return;

 	s2mps17->irq_masks_cur[irq_data->group] |= irq_data->mask;
 }

 static void s2mps17_irq_unmask(struct irq_data *data)
 {
 	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);
 	const struct s2mps17_irq_data *irq_data =
 	    irq_to_s2mps17_irq(s2mps17, data->irq);

 	if (irq_data->group >= S2MPS17_IRQ_GROUP_NR)
 		return;

 	s2mps17->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
 }

 static struct irq_chip s2mps17_irq_chip = {
 	.name			= MFD_DEV_NAME,
 	.irq_bus_lock		= s2mps17_irq_lock,
 	.irq_bus_sync_unlock	= s2mps17_irq_sync_unlock,
 	.irq_mask		= s2mps17_irq_mask,
 	.irq_unmask		= s2mps17_irq_unmask,
 };

 static irqreturn_t s2mps17_irq_thread(int irq, void *data)
 {
 	struct s2mps17_dev *s2mps17 = data;
 	u8 irq_reg[S2MPS17_IRQ_GROUP_NR] = {0};
 	u8 irq_src;
 	int i, ret;

 	pr_debug("%s: irq gpio pre-state(0x%02x)\n", __func__,
 				gpio_get_value(s2mps17->irq_gpio));

 	ret = s2mps17_read_reg(s2mps17->i2c,
 					S2MPS17_PMIC_REG_INTSRC, &irq_src);
 	if (ret) {
 		pr_err("%s:%s Failed to read interrupt source: %d\n",
 			MFD_DEV_NAME, __func__, ret);
 		return IRQ_NONE;
 	}

 	pr_info("%s: interrupt source(0x%02x)\n", __func__, irq_src);

 	if (irq_src & S2MPS17_IRQSRC_PMIC) {
 		/* PMIC_INT */
 		ret = s2mps17_bulk_read(s2mps17->pmic, S2MPS17_PMIC_REG_INT1,
 				S2MPS17_NUM_IRQ_PMIC_REGS, &irq_reg[PMIC_INT1]);
 		if (ret) {
 			pr_err("%s:%s Failed to read pmic interrupt: %d\n",
 				MFD_DEV_NAME, __func__, ret);
 			return IRQ_NONE;
 		}

 		pr_info("%s: pmic interrupt(0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x)\n",
 			 __func__, irq_reg[PMIC_INT1], irq_reg[PMIC_INT2],
 			 irq_reg[PMIC_INT3], irq_reg[PMIC_INT4], irq_reg[PMIC_INT5], irq_reg[PMIC_INT6]);
 	}

 	/* Apply masking */
 	for (i = 0; i < S2MPS17_IRQ_GROUP_NR; i++)
 		irq_reg[i] &= ~s2mps17->irq_masks_cur[i];

 	/* Report */
 	for (i = 0; i < S2MPS17_IRQ_NR; i++) {
 		if (irq_reg[s2mps17_irqs[i].group] & s2mps17_irqs[i].mask)
 			handle_nested_irq(s2mps17->irq_base + i);
 	}

 	return IRQ_HANDLED;
 }

 int s2mps17_irq_init(struct s2mps17_dev *s2mps17)
 {
 	int i;
 	int ret;
 	u8 i2c_data;
 	int cur_irq;

 	if (!s2mps17->irq_gpio) {
 		dev_warn(s2mps17->dev, "No interrupt specified.\n");
 		s2mps17->irq_base = 0;
 		return 0;
 	}

 	if (!s2mps17->irq_base) {
 		dev_err(s2mps17->dev, "No interrupt base specified.\n");
 		return 0;
 	}

 	mutex_init(&s2mps17->irqlock);

 	s2mps17->irq = gpio_to_irq(s2mps17->irq_gpio);
 	pr_info("%s:%s irq=%d, irq->gpio=%d\n", MFD_DEV_NAME, __func__,
 			s2mps17->irq, s2mps17->irq_gpio);

 	ret = gpio_request(s2mps17->irq_gpio, "if_pmic_irq");
 	if (ret) {
 		dev_err(s2mps17->dev, "%s: failed requesting gpio %d\n",
 			__func__, s2mps17->irq_gpio);
 		return ret;
 	}
 	gpio_direction_input(s2mps17->irq_gpio);
 	gpio_free(s2mps17->irq_gpio);

 	/* Mask individual interrupt sources */
 	for (i = 0; i < S2MPS17_IRQ_GROUP_NR; i++) {
 		struct i2c_client *i2c;

 		s2mps17->irq_masks_cur[i] = 0xff;
 		s2mps17->irq_masks_cache[i] = 0xff;

 		i2c = get_i2c(s2mps17, i);

 		if (IS_ERR_OR_NULL(i2c))
 			continue;
 		if (s2mps17_mask_reg[i] == S2MPS17_REG_INVALID)
 			continue;

 		s2mps17_write_reg(i2c, s2mps17_mask_reg[i], 0xff);
 	}

 	/* Register with genirq */
 	for (i = 0; i < S2MPS17_IRQ_NR; i++) {
 		cur_irq = i + s2mps17->irq_base;
 		irq_set_chip_data(cur_irq, s2mps17);
 		irq_set_chip_and_handler(cur_irq, &s2mps17_irq_chip,
 					 handle_level_irq);
 		irq_set_nested_thread(cur_irq, 1);
 #ifdef CONFIG_ARM
 		set_irq_flags(cur_irq, IRQF_VALID);
 #else
 		irq_set_noprobe(cur_irq);
 #endif
 	}

 	s2mps17_write_reg(s2mps17->i2c, S2MPS17_PMIC_REG_INTSRC_MASK, 0xff);
 	/* Unmask s2mps17 interrupt */
 	ret = s2mps17_read_reg(s2mps17->i2c, S2MPS17_PMIC_REG_INTSRC_MASK,
 			  &i2c_data);
 	if (ret) {
 		pr_err("%s:%s fail to read intsrc mask reg\n",
 					 MFD_DEV_NAME, __func__);
 		return ret;
 	}

 	i2c_data &= ~(S2MPS17_IRQSRC_PMIC);	/* Unmask pmic interrupt */
 	s2mps17_write_reg(s2mps17->i2c, S2MPS17_PMIC_REG_INTSRC_MASK,
 			   i2c_data);

 	pr_info("%s:%s s2mps17_PMIC_REG_INTSRC_MASK=0x%02x\n",
 			MFD_DEV_NAME, __func__, i2c_data);

 	ret = request_threaded_irq(s2mps17->irq, NULL, s2mps17_irq_thread,
 				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 				   "s2mps17-irq", s2mps17);

 	if (ret) {
 		dev_err(s2mps17->dev, "Failed to request IRQ %d: %d\n",
 			s2mps17->irq, ret);
 		return ret;
 	}

 	return 0;
 }

 void s2mps17_irq_exit(struct s2mps17_dev *s2mps17)
 {
 	if (s2mps17->irq)
 		free_irq(s2mps17->irq, s2mps17);
 }
	/*
	* s2mps17-irq.c - Interrupt controller support for S2MPS17
	*
	* Copyright (C) 2016 Samsung Electronics Co.Ltd
	*
	* 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
	*
	*/

	#include <linux/err.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/gpio.h>
	#include <linux/mfd/samsung/s2mps17.h>
	#include <linux/mfd/samsung/s2mps17-private.h>

	static const u8 s2mps17_mask_reg[] = {
	/* TODO: Need to check other INTMASK */
	[PMIC_INT1] = S2MPS17_PMIC_REG_INT1M,
	[PMIC_INT2] = S2MPS17_PMIC_REG_INT2M,
	[PMIC_INT3] = S2MPS17_PMIC_REG_INT3M,
	[PMIC_INT4] = S2MPS17_PMIC_REG_INT4M,
	[PMIC_INT5] = S2MPS17_PMIC_REG_INT5M,
	[PMIC_INT6] = S2MPS17_PMIC_REG_INT6M,
	};

	static struct i2c_client get_i2c(struct s2mps17_dev s2mps17,
	enum s2mps17_irq_source src)
	{
	switch (src) {
	case PMIC_INT1 ... PMIC_INT6:
	return s2mps17->pmic;
	default:
	return ERR_PTR(-EINVAL);
	}
	}

	struct s2mps17_irq_data {
	int mask;
	enum s2mps17_irq_source group;
	};

	#define DECLARE_IRQ(idx, _group, _mask) \
	[(idx)] = { .group = (_group), .mask = (_mask) }
	static const struct s2mps17_irq_data s2mps17_irqs[] = {
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_PWRONR_INT1, PMIC_INT1, 1 << 1),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_PWRONF_INT1, PMIC_INT1, 1 << 0),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_JIGONBF_INT1, PMIC_INT1, 1 << 2),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_JIGONBR_INT1, PMIC_INT1, 1 << 3),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_ACOKBF_INT1, PMIC_INT1, 1 << 4),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_ACOKBR_INT1, PMIC_INT1, 1 << 5),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_PWRON1S_INT1, PMIC_INT1, 1 << 6),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_MRB_INT1, PMIC_INT1, 1 << 7),

	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTC60S_INT2, PMIC_INT2, 1 << 0),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTCA1_INT2, PMIC_INT2, 1 << 1),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTCA0_INT2, PMIC_INT2, 1 << 2),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_SMPL_INT2, PMIC_INT2, 1 << 3),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_RTC1S_INT2, PMIC_INT2, 1 << 4),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_WTSR_INT2, PMIC_INT2, 1 << 5),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_WRSTB_INT2, PMIC_INT2, 1 << 7),

	DECLARE_IRQ(S2MPS17_PMIC_IRQ_120C_INT3, PMIC_INT3, 1 << 0),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_140C_INT3, PMIC_INT3, 1 << 1),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_TSD_INT3, PMIC_INT3, 1 << 2),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_ADCDONE_INT3, PMIC_INT3, 1 << 7),

	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC0_INT4, PMIC_INT4, 1 << 0),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC1_INT4, PMIC_INT4, 1 << 1),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC2_INT4, PMIC_INT4, 1 << 2),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC3_INT4, PMIC_INT4, 1 << 3),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC4_INT4, PMIC_INT4, 1 << 4),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC5_INT4, PMIC_INT4, 1 << 5),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC6_INT4, PMIC_INT4, 1 << 6),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OC7_INT4, PMIC_INT4, 1 << 7),

	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB1_INT5, PMIC_INT5, 1 << 0),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB2_INT5, PMIC_INT5, 1 << 1),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB3_INT5, PMIC_INT5, 1 << 2),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB4_INT5, PMIC_INT5, 1 << 3),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB5_INT5, PMIC_INT5, 1 << 4),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB6_INT5, PMIC_INT5, 1 << 5),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB7_INT5, PMIC_INT5, 1 << 6),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB8_INT5, PMIC_INT5, 1 << 7),

	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB9_INT6, PMIC_INT6, 1 << 0),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB10_INT6, PMIC_INT6, 1 << 1),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB11_INT6, PMIC_INT6, 1 << 2),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPB12_INT6, PMIC_INT6, 1 << 3),
	DECLARE_IRQ(S2MPS17_PMIC_IRQ_OCPBB_INT6, PMIC_INT6, 1 << 4),
	};

	static void s2mps17_irq_lock(struct irq_data *data)
	{
	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);

	mutex_lock(&s2mps17->irqlock);
	}

	static void s2mps17_irq_sync_unlock(struct irq_data *data)
	{
	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);
	int i;

	for (i = 0; i < S2MPS17_IRQ_GROUP_NR; i++) {
	u8 mask_reg = s2mps17_mask_reg[i];
	struct i2c_client *i2c = get_i2c(s2mps17, i);

	if (mask_reg == S2MPS17_REG_INVALID \|\|
	IS_ERR_OR_NULL(i2c))
	continue;
	s2mps17->irq_masks_cache[i] = s2mps17->irq_masks_cur[i];

	s2mps17_write_reg(i2c, s2mps17_mask_reg[i],
	s2mps17->irq_masks_cur[i]);
	}

	mutex_unlock(&s2mps17->irqlock);
	}

	static const inline struct s2mps17_irq_data *
	irq_to_s2mps17_irq(struct s2mps17_dev *s2mps17, int irq)
	{
	return &s2mps17_irqs[irq - s2mps17->irq_base];
	}

	static void s2mps17_irq_mask(struct irq_data *data)
	{
	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);
	const struct s2mps17_irq_data *irq_data =
	irq_to_s2mps17_irq(s2mps17, data->irq);

	if (irq_data->group >= S2MPS17_IRQ_GROUP_NR)
	return;

	s2mps17->irq_masks_cur[irq_data->group] \|= irq_data->mask;
	}

	static void s2mps17_irq_unmask(struct irq_data *data)
	{
	struct s2mps17_dev *s2mps17 = irq_get_chip_data(data->irq);
	const struct s2mps17_irq_data *irq_data =
	irq_to_s2mps17_irq(s2mps17, data->irq);

	if (irq_data->group >= S2MPS17_IRQ_GROUP_NR)
	return;

	s2mps17->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
	}

	static struct irq_chip s2mps17_irq_chip = {
	.name = MFD_DEV_NAME,
	.irq_bus_lock = s2mps17_irq_lock,
	.irq_bus_sync_unlock = s2mps17_irq_sync_unlock,
	.irq_mask = s2mps17_irq_mask,
	.irq_unmask = s2mps17_irq_unmask,
	};

	static irqreturn_t s2mps17_irq_thread(int irq, void *data)
	{
	struct s2mps17_dev *s2mps17 = data;
	u8 irq_reg[S2MPS17_IRQ_GROUP_NR] = {0};
	u8 irq_src;
	int i, ret;

	pr_debug("%s: irq gpio pre-state(0x%02x)\n", __func__,
	gpio_get_value(s2mps17->irq_gpio));

	ret = s2mps17_read_reg(s2mps17->i2c,
	S2MPS17_PMIC_REG_INTSRC, &irq_src);
	if (ret) {
	pr_err("%s:%s Failed to read interrupt source: %d\n",
	MFD_DEV_NAME, __func__, ret);
	return IRQ_NONE;
	}

	pr_info("%s: interrupt source(0x%02x)\n", __func__, irq_src);

	if (irq_src & S2MPS17_IRQSRC_PMIC) {
	/* PMIC_INT */
	ret = s2mps17_bulk_read(s2mps17->pmic, S2MPS17_PMIC_REG_INT1,
	S2MPS17_NUM_IRQ_PMIC_REGS, &irq_reg[PMIC_INT1]);
	if (ret) {
	pr_err("%s:%s Failed to read pmic interrupt: %d\n",
	MFD_DEV_NAME, __func__, ret);
	return IRQ_NONE;
	}

	pr_info("%s: pmic interrupt(0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x)\n",
	__func__, irq_reg[PMIC_INT1], irq_reg[PMIC_INT2],
	irq_reg[PMIC_INT3], irq_reg[PMIC_INT4], irq_reg[PMIC_INT5], irq_reg[PMIC_INT6]);
	}

	/* Apply masking */
	for (i = 0; i < S2MPS17_IRQ_GROUP_NR; i++)
	irq_reg[i] &= ~s2mps17->irq_masks_cur[i];

	/* Report */
	for (i = 0; i < S2MPS17_IRQ_NR; i++) {
	if (irq_reg[s2mps17_irqs[i].group] & s2mps17_irqs[i].mask)
	handle_nested_irq(s2mps17->irq_base + i);
	}

	return IRQ_HANDLED;
	}

	int s2mps17_irq_init(struct s2mps17_dev *s2mps17)
	{
	int i;
	int ret;
	u8 i2c_data;
	int cur_irq;

	if (!s2mps17->irq_gpio) {
	dev_warn(s2mps17->dev, "No interrupt specified.\n");
	s2mps17->irq_base = 0;
	return 0;
	}

	if (!s2mps17->irq_base) {
	dev_err(s2mps17->dev, "No interrupt base specified.\n");
	return 0;
	}

	mutex_init(&s2mps17->irqlock);

	s2mps17->irq = gpio_to_irq(s2mps17->irq_gpio);
	pr_info("%s:%s irq=%d, irq->gpio=%d\n", MFD_DEV_NAME, __func__,
	s2mps17->irq, s2mps17->irq_gpio);

	ret = gpio_request(s2mps17->irq_gpio, "if_pmic_irq");
	if (ret) {
	dev_err(s2mps17->dev, "%s: failed requesting gpio %d\n",
	__func__, s2mps17->irq_gpio);
	return ret;
	}
	gpio_direction_input(s2mps17->irq_gpio);
	gpio_free(s2mps17->irq_gpio);

	/* Mask individual interrupt sources */
	for (i = 0; i < S2MPS17_IRQ_GROUP_NR; i++) {
	struct i2c_client *i2c;

	s2mps17->irq_masks_cur[i] = 0xff;
	s2mps17->irq_masks_cache[i] = 0xff;

	i2c = get_i2c(s2mps17, i);

	if (IS_ERR_OR_NULL(i2c))
	continue;
	if (s2mps17_mask_reg[i] == S2MPS17_REG_INVALID)
	continue;

	s2mps17_write_reg(i2c, s2mps17_mask_reg[i], 0xff);
	}

	/* Register with genirq */
	for (i = 0; i < S2MPS17_IRQ_NR; i++) {
	cur_irq = i + s2mps17->irq_base;
	irq_set_chip_data(cur_irq, s2mps17);
	irq_set_chip_and_handler(cur_irq, &s2mps17_irq_chip,
	handle_level_irq);
	irq_set_nested_thread(cur_irq, 1);
	#ifdef CONFIG_ARM
	set_irq_flags(cur_irq, IRQF_VALID);
	#else
	irq_set_noprobe(cur_irq);
	#endif
	}

	s2mps17_write_reg(s2mps17->i2c, S2MPS17_PMIC_REG_INTSRC_MASK, 0xff);
	/* Unmask s2mps17 interrupt */
	ret = s2mps17_read_reg(s2mps17->i2c, S2MPS17_PMIC_REG_INTSRC_MASK,
	&i2c_data);
	if (ret) {
	pr_err("%s:%s fail to read intsrc mask reg\n",
	MFD_DEV_NAME, __func__);
	return ret;
	}

	i2c_data &= ~(S2MPS17_IRQSRC_PMIC); /* Unmask pmic interrupt */
	s2mps17_write_reg(s2mps17->i2c, S2MPS17_PMIC_REG_INTSRC_MASK,
	i2c_data);

	pr_info("%s:%s s2mps17_PMIC_REG_INTSRC_MASK=0x%02x\n",
	MFD_DEV_NAME, __func__, i2c_data);

	ret = request_threaded_irq(s2mps17->irq, NULL, s2mps17_irq_thread,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"s2mps17-irq", s2mps17);

	if (ret) {
	dev_err(s2mps17->dev, "Failed to request IRQ %d: %d\n",
	s2mps17->irq, ret);
	return ret;
	}

	return 0;
	}

	void s2mps17_irq_exit(struct s2mps17_dev *s2mps17)
	{
	if (s2mps17->irq)
	free_irq(s2mps17->irq, s2mps17);
	}