drivers/mfd/pm8821-irq.c - fp2-dev/kernel/msm - Gitiles

 /*
  * Copyright (c) 2012, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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.
  */

 #define pr_fmt(fmt)	"%s: " fmt, __func__

 #include <linux/export.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/mfd/pm8xxx/core.h>
 #include <linux/mfd/pm8xxx/pm8821-irq.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <mach/mpm.h>

 #define PM8821_TOTAL_IRQ_MASTERS	2
 #define PM8821_BLOCKS_PER_MASTER	7
 #define PM8821_IRQ_MASTER1_SET		0x01
 #define PM8821_IRQ_CLEAR_OFFSET		0x01
 #define PM8821_IRQ_RT_STATUS_OFFSET	0x0F
 #define PM8821_IRQ_MASK_REG_OFFSET	0x08
 #define SSBI_REG_ADDR_IRQ_MASTER0	0x30
 #define SSBI_REG_ADDR_IRQ_MASTER1	0xB0
 #define MPM_PIN_FOR_8821_IRQ		7
 #define SSBI_REG_ADDR_IRQ_IT_STATUS(master_base, block) (master_base + block)

 /*
  * Block 0 does not exist in PM8821 IRQ SSBI address space,
  * IRQ0 is assigned to bit0 of block1.
  */
 #define SSBI_REG_ADDR_IRQ_IT_CLEAR(master_base, block) \
 	(master_base + PM8821_IRQ_CLEAR_OFFSET + block)

 #define SSBI_REG_ADDR_IRQ_RT_STATUS(master_base, block) \
 	(master_base + PM8821_IRQ_RT_STATUS_OFFSET + block)

 #define SSBI_REG_ADDR_IRQ_MASK(master_base, block) \
 	(master_base + PM8821_IRQ_MASK_REG_OFFSET + block)

 struct pm_irq_chip {
 	struct device		*dev;
 	spinlock_t		pm_irq_lock;
 	unsigned int		base_addr;
 	unsigned int		devirq;
 	unsigned int		irq_base;
 	unsigned int		num_irqs;
 	int			masters[PM8821_TOTAL_IRQ_MASTERS];
 };

 static int pm8821_irq_masked_write(struct pm_irq_chip *chip, u16 addr,
 							u8 mask, u8 val)
 {
 	int rc;
 	u8 reg;

 	rc = pm8xxx_readb(chip->dev, addr, &reg);
 	if (rc) {
 		pr_err("read failed addr = %03X, rc = %d\n", addr, rc);
 		return rc;
 	}

 	reg &= ~mask;
 	reg |= val & mask;

 	rc = pm8xxx_writeb(chip->dev, addr, reg);
 	if (rc) {
 		pr_err("write failed addr = %03X, rc = %d\n", addr, rc);
 		return rc;
 	}

 	return 0;
 }

 static int pm8821_read_master_irq(const struct pm_irq_chip *chip,
 						int m, u8 *master)
 {
 	return pm8xxx_readb(chip->dev, chip->masters[m], master);
 }

 static int pm8821_read_block_irq(struct pm_irq_chip *chip, int master,
 						u8 block, u8 *bits)
 {
 	int rc;

 	spin_lock(&chip->pm_irq_lock);

 	rc = pm8xxx_readb(chip->dev,
 	    SSBI_REG_ADDR_IRQ_IT_STATUS(chip->masters[master], block), bits);
 	if (rc)
 		pr_err("Failed Reading Status rc=%d\n", rc);

 	spin_unlock(&chip->pm_irq_lock);
 	return rc;
 }


 static int pm8821_irq_block_handler(struct pm_irq_chip *chip,
 					int master_number, int block)
 {
 	int pmirq, irq, i, ret;
 	u8 bits;

 	ret = pm8821_read_block_irq(chip, master_number, block, &bits);
 	if (ret) {
 		pr_err("Failed reading %d block ret=%d", block, ret);
 		return ret;
 	}
 	if (!bits) {
 		pr_err("block bit set in master but no irqs: %d", block);
 		return 0;
 	}

 	/* Convert block offset to global block number */
 	block += (master_number * PM8821_BLOCKS_PER_MASTER) - 1;

 	/* Check IRQ bits */
 	for (i = 0; i < 8; i++) {
 		if (bits & BIT(i)) {
 			pmirq = (block << 3) + i;
 			irq = pmirq + chip->irq_base;
 			generic_handle_irq(irq);
 		}
 	}
 	return 0;
 }

 static int pm8821_irq_read_master(struct pm_irq_chip *chip,
 				int master_number, u8 master_val)
 {
 	int ret = 0;
 	int block;

 	for (block = 1; block < 8; block++) {
 		if (master_val & BIT(block)) {
 			ret |= pm8821_irq_block_handler(chip,
 					master_number, block);
 		}
 	}

 	return ret;
 }

 static irqreturn_t pm8821_irq_handler(int irq, void *data)
 {
 	struct pm_irq_chip *chip = data;
 	int ret;
 	u8 master;

 	ret = pm8821_read_master_irq(chip, 0, &master);
 	if (ret) {
 		pr_err("Failed to read master 0 ret=%d\n", ret);
 		return ret;
 	}

 	if (master & ~PM8821_IRQ_MASTER1_SET)
 		pm8821_irq_read_master(chip, 0, master);

 	if (!(master & PM8821_IRQ_MASTER1_SET))
 		goto done;

 	ret = pm8821_read_master_irq(chip, 1, &master);
 	if (ret) {
 		pr_err("Failed to read master 1 ret=%d\n", ret);
 		return ret;
 	}

 	pm8821_irq_read_master(chip, 1, master);

 done:
 	return IRQ_HANDLED;
 }

 static void pm8821_irq_mask(struct irq_data *d)
 {
 	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 	unsigned int pmirq = d->irq - chip->irq_base;
 	int irq_bit, rc;
 	u8 block, master;

 	block = pmirq >> 3;
 	master = block / PM8821_BLOCKS_PER_MASTER;
 	irq_bit = pmirq % 8;
 	block %= PM8821_BLOCKS_PER_MASTER;

 	spin_lock(&chip->pm_irq_lock);

 	rc = pm8821_irq_masked_write(chip,
 		SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
 		BIT(irq_bit), BIT(irq_bit));

 	if (rc)
 		pr_err("Failed to read/write mask IRQ:%d rc=%d\n", pmirq, rc);

 	spin_unlock(&chip->pm_irq_lock);
 }

 static void pm8821_irq_mask_ack(struct irq_data *d)
 {
 	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 	unsigned int pmirq = d->irq - chip->irq_base;
 	int irq_bit, rc;
 	u8 block, master;

 	block = pmirq >> 3;
 	master = block / PM8821_BLOCKS_PER_MASTER;
 	irq_bit = pmirq % 8;
 	block %= PM8821_BLOCKS_PER_MASTER;

 	spin_lock(&chip->pm_irq_lock);

 	rc = pm8821_irq_masked_write(chip,
 		SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
 		BIT(irq_bit), BIT(irq_bit));

 	if (rc) {
 		pr_err("Failed to read/write mask IRQ:%d rc=%d\n", pmirq, rc);
 		goto fail;
 	}

 	rc = pm8821_irq_masked_write(chip,
 		SSBI_REG_ADDR_IRQ_IT_CLEAR(chip->masters[master], block),
 		BIT(irq_bit), BIT(irq_bit));

 	if (rc) {
 		pr_err("Failed to read/write IT_CLEAR IRQ:%d rc=%d\n",
 								pmirq, rc);
 	}

 fail:
 	spin_unlock(&chip->pm_irq_lock);
 }

 static void pm8821_irq_unmask(struct irq_data *d)
 {
 	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 	unsigned int pmirq = d->irq - chip->irq_base;
 	int irq_bit, rc;
 	u8 block, master;

 	block = pmirq >> 3;
 	master = block / PM8821_BLOCKS_PER_MASTER;
 	irq_bit = pmirq % 8;
 	block %= PM8821_BLOCKS_PER_MASTER;

 	spin_lock(&chip->pm_irq_lock);

 	rc = pm8821_irq_masked_write(chip,
 		SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
 		BIT(irq_bit), ~BIT(irq_bit));

 	if (rc)
 		pr_err("Failed to read/write unmask IRQ:%d rc=%d\n", pmirq, rc);

 	spin_unlock(&chip->pm_irq_lock);
 }

 static int pm8821_irq_set_type(struct irq_data *d, unsigned int flow_type)
 {
 	/*
 	 * PM8821 IRQ controller does not have explicit software support for
 	 * IRQ flow type.
 	 */
 	return 0;
 }

 static int pm8821_irq_set_wake(struct irq_data *d, unsigned int on)
 {
 	return 0;
 }

 static int pm8821_irq_read_line(struct irq_data *d)
 {
 	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);

 	return pm8821_get_irq_stat(chip, d->irq);
 }

 static struct irq_chip pm_irq_chip = {
 	.name		= "pm8821-irq",
 	.irq_mask	= pm8821_irq_mask,
 	.irq_mask_ack	= pm8821_irq_mask_ack,
 	.irq_unmask	= pm8821_irq_unmask,
 	.irq_set_type	= pm8821_irq_set_type,
 	.irq_set_wake	= pm8821_irq_set_wake,
 	.irq_read_line	= pm8821_irq_read_line,
 	.flags		= IRQCHIP_MASK_ON_SUSPEND,
 };

 /**
  * pm8821_get_irq_stat - get the status of the irq line
  * @chip: pointer to identify a pmic irq controller
  * @irq: the irq number
  *
  * The pm8821 gpio and mpp rely on the interrupt block to read
  * the values on their pins. This function is to facilitate reading
  * the status of a gpio or an mpp line. The caller has to convert the
  * gpio number to irq number.
  *
  * RETURNS:
  * an int indicating the value read on that line
  */
 int pm8821_get_irq_stat(struct pm_irq_chip *chip, int irq)
 {
 	int pmirq, rc;
 	u8 block, bits, bit, master;
 	unsigned long flags;

 	if (chip == NULL || irq < chip->irq_base
 	    || irq >= chip->irq_base + chip->num_irqs)
 		return -EINVAL;

 	pmirq = irq - chip->irq_base;

 	block = pmirq >> 3;
 	master = block / PM8821_BLOCKS_PER_MASTER;
 	bit = pmirq % 8;
 	block %= PM8821_BLOCKS_PER_MASTER;

 	spin_lock_irqsave(&chip->pm_irq_lock, flags);

 	rc = pm8xxx_readb(chip->dev,
 		SSBI_REG_ADDR_IRQ_RT_STATUS(chip->masters[master], block),
 		&bits);
 	if (rc) {
 		pr_err("Failed Configuring irq=%d pmirq=%d blk=%d rc=%d\n",
 						irq, pmirq, block, rc);
 		goto bail_out;
 	}

 	rc = (bits & BIT(bit)) ? 1 : 0;

 bail_out:
 	spin_unlock_irqrestore(&chip->pm_irq_lock, flags);

 	return rc;
 }
 EXPORT_SYMBOL_GPL(pm8821_get_irq_stat);

 struct pm_irq_chip *  __devinit pm8821_irq_init(struct device *dev,
 				const struct pm8xxx_irq_platform_data *pdata)
 {
 	struct pm_irq_chip	*chip;
 	int			devirq, rc, blocks, masters;
 	unsigned int		pmirq;

 	if (!pdata) {
 		pr_err("No platform data\n");
 		return ERR_PTR(-EINVAL);
 	}

 	devirq = pdata->devirq;
 	if (devirq < 0) {
 		pr_err("missing devirq\n");
 		rc = devirq;
 		return ERR_PTR(-EINVAL);
 	}

 	chip = kzalloc(sizeof(struct pm_irq_chip)
 			+ sizeof(u8) * pdata->irq_cdata.nirqs, GFP_KERNEL);
 	if (!chip) {
 		pr_err("Cannot alloc pm_irq_chip struct\n");
 		return ERR_PTR(-EINVAL);
 	}

 	chip->dev	= dev;
 	chip->devirq	= devirq;
 	chip->irq_base	= pdata->irq_base;
 	chip->num_irqs	= pdata->irq_cdata.nirqs;
 	chip->base_addr = pdata->irq_cdata.base_addr;
 	blocks		= DIV_ROUND_UP(pdata->irq_cdata.nirqs, 8);
 	masters		= DIV_ROUND_UP(blocks, PM8821_BLOCKS_PER_MASTER);
 	chip->masters[0] = chip->base_addr + SSBI_REG_ADDR_IRQ_MASTER0;
 	chip->masters[1] = chip->base_addr + SSBI_REG_ADDR_IRQ_MASTER1;

 	if (masters != PM8821_TOTAL_IRQ_MASTERS) {
 		pr_err("Unequal number of masters, passed: %d, "
 		"should have been: %d\n", masters, PM8821_TOTAL_IRQ_MASTERS);
 		kfree(chip);
 		return ERR_PTR(-EINVAL);
 	}

 	spin_lock_init(&chip->pm_irq_lock);

 	for (pmirq = 0; pmirq < chip->num_irqs; pmirq++) {
 		irq_set_chip_and_handler(chip->irq_base + pmirq,
 				&pm_irq_chip, handle_level_irq);
 		irq_set_chip_data(chip->irq_base + pmirq, chip);
 #ifdef CONFIG_ARM
 		set_irq_flags(chip->irq_base + pmirq, IRQF_VALID);
 #else
 		irq_set_noprobe(chip->irq_base + pmirq);
 #endif
 	}

 	if (devirq != 0) {
 		rc = request_irq(devirq, pm8821_irq_handler,
 			pdata->irq_trigger_flag, "pm8821_sec_irq", chip);
 		if (rc) {
 			pr_err("failed to request_irq for %d rc=%d\n",
 							devirq, rc);
 			kfree(chip);
 			return ERR_PTR(rc);
 		} else{
 			irq_set_irq_wake(devirq, 1);
 			msm_mpm_set_pin_wake(MPM_PIN_FOR_8821_IRQ, 1);
 			msm_mpm_set_pin_type(MPM_PIN_FOR_8821_IRQ,
 				pdata->irq_trigger_flag);
 		}
 	}

 	return chip;
 }

 int pm8821_irq_exit(struct pm_irq_chip *chip)
 {
 	irq_set_chained_handler(chip->devirq, NULL);
 	kfree(chip);
 	return 0;
 }
	/*
	* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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.
	*/

	#define pr_fmt(fmt) "%s: " fmt, __func__

	#include <linux/export.h>
	#include <linux/err.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/mfd/pm8xxx/core.h>
	#include <linux/mfd/pm8xxx/pm8821-irq.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <mach/mpm.h>

	#define PM8821_TOTAL_IRQ_MASTERS 2
	#define PM8821_BLOCKS_PER_MASTER 7
	#define PM8821_IRQ_MASTER1_SET 0x01
	#define PM8821_IRQ_CLEAR_OFFSET 0x01
	#define PM8821_IRQ_RT_STATUS_OFFSET 0x0F
	#define PM8821_IRQ_MASK_REG_OFFSET 0x08
	#define SSBI_REG_ADDR_IRQ_MASTER0 0x30
	#define SSBI_REG_ADDR_IRQ_MASTER1 0xB0
	#define MPM_PIN_FOR_8821_IRQ 7
	#define SSBI_REG_ADDR_IRQ_IT_STATUS(master_base, block) (master_base + block)

	/*
	* Block 0 does not exist in PM8821 IRQ SSBI address space,
	* IRQ0 is assigned to bit0 of block1.
	*/
	#define SSBI_REG_ADDR_IRQ_IT_CLEAR(master_base, block) \
	(master_base + PM8821_IRQ_CLEAR_OFFSET + block)

	#define SSBI_REG_ADDR_IRQ_RT_STATUS(master_base, block) \
	(master_base + PM8821_IRQ_RT_STATUS_OFFSET + block)

	#define SSBI_REG_ADDR_IRQ_MASK(master_base, block) \
	(master_base + PM8821_IRQ_MASK_REG_OFFSET + block)

	struct pm_irq_chip {
	struct device *dev;
	spinlock_t pm_irq_lock;
	unsigned int base_addr;
	unsigned int devirq;
	unsigned int irq_base;
	unsigned int num_irqs;
	int masters[PM8821_TOTAL_IRQ_MASTERS];
	};

	static int pm8821_irq_masked_write(struct pm_irq_chip *chip, u16 addr,
	u8 mask, u8 val)
	{
	int rc;
	u8 reg;

	rc = pm8xxx_readb(chip->dev, addr, &reg);
	if (rc) {
	pr_err("read failed addr = %03X, rc = %d\n", addr, rc);
	return rc;
	}

	reg &= ~mask;
	reg \|= val & mask;

	rc = pm8xxx_writeb(chip->dev, addr, reg);
	if (rc) {
	pr_err("write failed addr = %03X, rc = %d\n", addr, rc);
	return rc;
	}

	return 0;
	}

	static int pm8821_read_master_irq(const struct pm_irq_chip *chip,
	int m, u8 *master)
	{
	return pm8xxx_readb(chip->dev, chip->masters[m], master);
	}

	static int pm8821_read_block_irq(struct pm_irq_chip *chip, int master,
	u8 block, u8 *bits)
	{
	int rc;

	spin_lock(&chip->pm_irq_lock);

	rc = pm8xxx_readb(chip->dev,
	SSBI_REG_ADDR_IRQ_IT_STATUS(chip->masters[master], block), bits);
	if (rc)
	pr_err("Failed Reading Status rc=%d\n", rc);

	spin_unlock(&chip->pm_irq_lock);
	return rc;
	}


	static int pm8821_irq_block_handler(struct pm_irq_chip *chip,
	int master_number, int block)
	{
	int pmirq, irq, i, ret;
	u8 bits;

	ret = pm8821_read_block_irq(chip, master_number, block, &bits);
	if (ret) {
	pr_err("Failed reading %d block ret=%d", block, ret);
	return ret;
	}
	if (!bits) {
	pr_err("block bit set in master but no irqs: %d", block);
	return 0;
	}

	/* Convert block offset to global block number */
	block += (master_number * PM8821_BLOCKS_PER_MASTER) - 1;

	/* Check IRQ bits */
	for (i = 0; i < 8; i++) {
	if (bits & BIT(i)) {
	pmirq = (block << 3) + i;
	irq = pmirq + chip->irq_base;
	generic_handle_irq(irq);
	}
	}
	return 0;
	}

	static int pm8821_irq_read_master(struct pm_irq_chip *chip,
	int master_number, u8 master_val)
	{
	int ret = 0;
	int block;

	for (block = 1; block < 8; block++) {
	if (master_val & BIT(block)) {
	ret \|= pm8821_irq_block_handler(chip,
	master_number, block);
	}
	}

	return ret;
	}

	static irqreturn_t pm8821_irq_handler(int irq, void *data)
	{
	struct pm_irq_chip *chip = data;
	int ret;
	u8 master;

	ret = pm8821_read_master_irq(chip, 0, &master);
	if (ret) {
	pr_err("Failed to read master 0 ret=%d\n", ret);
	return ret;
	}

	if (master & ~PM8821_IRQ_MASTER1_SET)
	pm8821_irq_read_master(chip, 0, master);

	if (!(master & PM8821_IRQ_MASTER1_SET))
	goto done;

	ret = pm8821_read_master_irq(chip, 1, &master);
	if (ret) {
	pr_err("Failed to read master 1 ret=%d\n", ret);
	return ret;
	}

	pm8821_irq_read_master(chip, 1, master);

	done:
	return IRQ_HANDLED;
	}

	static void pm8821_irq_mask(struct irq_data *d)
	{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int pmirq = d->irq - chip->irq_base;
	int irq_bit, rc;
	u8 block, master;

	block = pmirq >> 3;
	master = block / PM8821_BLOCKS_PER_MASTER;
	irq_bit = pmirq % 8;
	block %= PM8821_BLOCKS_PER_MASTER;

	spin_lock(&chip->pm_irq_lock);

	rc = pm8821_irq_masked_write(chip,
	SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
	BIT(irq_bit), BIT(irq_bit));

	if (rc)
	pr_err("Failed to read/write mask IRQ:%d rc=%d\n", pmirq, rc);

	spin_unlock(&chip->pm_irq_lock);
	}

	static void pm8821_irq_mask_ack(struct irq_data *d)
	{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int pmirq = d->irq - chip->irq_base;
	int irq_bit, rc;
	u8 block, master;

	block = pmirq >> 3;
	master = block / PM8821_BLOCKS_PER_MASTER;
	irq_bit = pmirq % 8;
	block %= PM8821_BLOCKS_PER_MASTER;

	spin_lock(&chip->pm_irq_lock);

	rc = pm8821_irq_masked_write(chip,
	SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
	BIT(irq_bit), BIT(irq_bit));

	if (rc) {
	pr_err("Failed to read/write mask IRQ:%d rc=%d\n", pmirq, rc);
	goto fail;
	}

	rc = pm8821_irq_masked_write(chip,
	SSBI_REG_ADDR_IRQ_IT_CLEAR(chip->masters[master], block),
	BIT(irq_bit), BIT(irq_bit));

	if (rc) {
	pr_err("Failed to read/write IT_CLEAR IRQ:%d rc=%d\n",
	pmirq, rc);
	}

	fail:
	spin_unlock(&chip->pm_irq_lock);
	}

	static void pm8821_irq_unmask(struct irq_data *d)
	{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int pmirq = d->irq - chip->irq_base;
	int irq_bit, rc;
	u8 block, master;

	block = pmirq >> 3;
	master = block / PM8821_BLOCKS_PER_MASTER;
	irq_bit = pmirq % 8;
	block %= PM8821_BLOCKS_PER_MASTER;

	spin_lock(&chip->pm_irq_lock);

	rc = pm8821_irq_masked_write(chip,
	SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
	BIT(irq_bit), ~BIT(irq_bit));

	if (rc)
	pr_err("Failed to read/write unmask IRQ:%d rc=%d\n", pmirq, rc);

	spin_unlock(&chip->pm_irq_lock);
	}

	static int pm8821_irq_set_type(struct irq_data *d, unsigned int flow_type)
	{
	/*
	* PM8821 IRQ controller does not have explicit software support for
	* IRQ flow type.
	*/
	return 0;
	}

	static int pm8821_irq_set_wake(struct irq_data *d, unsigned int on)
	{
	return 0;
	}

	static int pm8821_irq_read_line(struct irq_data *d)
	{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);

	return pm8821_get_irq_stat(chip, d->irq);
	}

	static struct irq_chip pm_irq_chip = {
	.name = "pm8821-irq",
	.irq_mask = pm8821_irq_mask,
	.irq_mask_ack = pm8821_irq_mask_ack,
	.irq_unmask = pm8821_irq_unmask,
	.irq_set_type = pm8821_irq_set_type,
	.irq_set_wake = pm8821_irq_set_wake,
	.irq_read_line = pm8821_irq_read_line,
	.flags = IRQCHIP_MASK_ON_SUSPEND,
	};

	/**
	* pm8821_get_irq_stat - get the status of the irq line
	* @chip: pointer to identify a pmic irq controller
	* @irq: the irq number
	*
	* The pm8821 gpio and mpp rely on the interrupt block to read
	* the values on their pins. This function is to facilitate reading
	* the status of a gpio or an mpp line. The caller has to convert the
	* gpio number to irq number.
	*
	* RETURNS:
	* an int indicating the value read on that line
	*/
	int pm8821_get_irq_stat(struct pm_irq_chip *chip, int irq)
	{
	int pmirq, rc;
	u8 block, bits, bit, master;
	unsigned long flags;

	if (chip == NULL \|\| irq < chip->irq_base
	\|\| irq >= chip->irq_base + chip->num_irqs)
	return -EINVAL;

	pmirq = irq - chip->irq_base;

	block = pmirq >> 3;
	master = block / PM8821_BLOCKS_PER_MASTER;
	bit = pmirq % 8;
	block %= PM8821_BLOCKS_PER_MASTER;

	spin_lock_irqsave(&chip->pm_irq_lock, flags);

	rc = pm8xxx_readb(chip->dev,
	SSBI_REG_ADDR_IRQ_RT_STATUS(chip->masters[master], block),
	&bits);
	if (rc) {
	pr_err("Failed Configuring irq=%d pmirq=%d blk=%d rc=%d\n",
	irq, pmirq, block, rc);
	goto bail_out;
	}

	rc = (bits & BIT(bit)) ? 1 : 0;

	bail_out:
	spin_unlock_irqrestore(&chip->pm_irq_lock, flags);

	return rc;
	}
	EXPORT_SYMBOL_GPL(pm8821_get_irq_stat);

	struct pm_irq_chip * __devinit pm8821_irq_init(struct device *dev,
	const struct pm8xxx_irq_platform_data *pdata)
	{
	struct pm_irq_chip *chip;
	int devirq, rc, blocks, masters;
	unsigned int pmirq;

	if (!pdata) {
	pr_err("No platform data\n");
	return ERR_PTR(-EINVAL);
	}

	devirq = pdata->devirq;
	if (devirq < 0) {
	pr_err("missing devirq\n");
	rc = devirq;
	return ERR_PTR(-EINVAL);
	}

	chip = kzalloc(sizeof(struct pm_irq_chip)
	+ sizeof(u8) * pdata->irq_cdata.nirqs, GFP_KERNEL);
	if (!chip) {
	pr_err("Cannot alloc pm_irq_chip struct\n");
	return ERR_PTR(-EINVAL);
	}

	chip->dev = dev;
	chip->devirq = devirq;
	chip->irq_base = pdata->irq_base;
	chip->num_irqs = pdata->irq_cdata.nirqs;
	chip->base_addr = pdata->irq_cdata.base_addr;
	blocks = DIV_ROUND_UP(pdata->irq_cdata.nirqs, 8);
	masters = DIV_ROUND_UP(blocks, PM8821_BLOCKS_PER_MASTER);
	chip->masters[0] = chip->base_addr + SSBI_REG_ADDR_IRQ_MASTER0;
	chip->masters[1] = chip->base_addr + SSBI_REG_ADDR_IRQ_MASTER1;

	if (masters != PM8821_TOTAL_IRQ_MASTERS) {
	pr_err("Unequal number of masters, passed: %d, "
	"should have been: %d\n", masters, PM8821_TOTAL_IRQ_MASTERS);
	kfree(chip);
	return ERR_PTR(-EINVAL);
	}

	spin_lock_init(&chip->pm_irq_lock);

	for (pmirq = 0; pmirq < chip->num_irqs; pmirq++) {
	irq_set_chip_and_handler(chip->irq_base + pmirq,
	&pm_irq_chip, handle_level_irq);
	irq_set_chip_data(chip->irq_base + pmirq, chip);
	#ifdef CONFIG_ARM
	set_irq_flags(chip->irq_base + pmirq, IRQF_VALID);
	#else
	irq_set_noprobe(chip->irq_base + pmirq);
	#endif
	}

	if (devirq != 0) {
	rc = request_irq(devirq, pm8821_irq_handler,
	pdata->irq_trigger_flag, "pm8821_sec_irq", chip);
	if (rc) {
	pr_err("failed to request_irq for %d rc=%d\n",
	devirq, rc);
	kfree(chip);
	return ERR_PTR(rc);
	} else{
	irq_set_irq_wake(devirq, 1);
	msm_mpm_set_pin_wake(MPM_PIN_FOR_8821_IRQ, 1);
	msm_mpm_set_pin_type(MPM_PIN_FOR_8821_IRQ,
	pdata->irq_trigger_flag);
	}
	}

	return chip;
	}

	int pm8821_irq_exit(struct pm_irq_chip *chip)
	{
	irq_set_chained_handler(chip->devirq, NULL);
	kfree(chip);
	return 0;
	}