drivers/mfd/max8925-core.c - kernel/msm - Gitiles

 /*
  * Base driver for Maxim MAX8925
  *
  * Copyright (C) 2009-2010 Marvell International Ltd.
  *	Haojian Zhuang <haojian.zhuang@marvell.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max8925.h>

 static struct resource backlight_resources[] = {
 	{
 		.name	= "max8925-backlight",
 		.start	= MAX8925_WLED_MODE_CNTL,
 		.end	= MAX8925_WLED_CNTL,
 		.flags	= IORESOURCE_IO,
 	},
 };

 static struct mfd_cell backlight_devs[] = {
 	{
 		.name		= "max8925-backlight",
 		.num_resources	= 1,
 		.resources	= &backlight_resources[0],
 		.id		= -1,
 	},
 };

 static struct resource touch_resources[] = {
 	{
 		.name	= "max8925-tsc",
 		.start	= MAX8925_TSC_IRQ,
 		.end	= MAX8925_ADC_RES_END,
 		.flags	= IORESOURCE_IO,
 	},
 };

 static struct mfd_cell touch_devs[] = {
 	{
 		.name		= "max8925-touch",
 		.num_resources	= 1,
 		.resources	= &touch_resources[0],
 		.id		= -1,
 	},
 };

 static struct resource power_supply_resources[] = {
 	{
 		.name	= "max8925-power",
 		.start	= MAX8925_CHG_IRQ1,
 		.end	= MAX8925_CHG_IRQ1_MASK,
 		.flags	= IORESOURCE_IO,
 	},
 };

 static struct mfd_cell power_devs[] = {
 	{
 		.name		= "max8925-power",
 		.num_resources	= 1,
 		.resources	= &power_supply_resources[0],
 		.id		= -1,
 	},
 };

 static struct resource rtc_resources[] = {
 	{
 		.name	= "max8925-rtc",
 		.start	= MAX8925_RTC_IRQ,
 		.end	= MAX8925_RTC_IRQ_MASK,
 		.flags	= IORESOURCE_IO,
 	},
 };

 static struct mfd_cell rtc_devs[] = {
 	{
 		.name		= "max8925-rtc",
 		.num_resources	= 1,
 		.resources	= &rtc_resources[0],
 		.id		= -1,
 	},
 };

 #define MAX8925_REG_RESOURCE(_start, _end)	\
 {						\
 	.start	= MAX8925_##_start,		\
 	.end	= MAX8925_##_end,		\
 	.flags	= IORESOURCE_IO,		\
 }

 static struct resource regulator_resources[] = {
 	MAX8925_REG_RESOURCE(SDCTL1, SDCTL1),
 	MAX8925_REG_RESOURCE(SDCTL2, SDCTL2),
 	MAX8925_REG_RESOURCE(SDCTL3, SDCTL3),
 	MAX8925_REG_RESOURCE(LDOCTL1, LDOCTL1),
 	MAX8925_REG_RESOURCE(LDOCTL2, LDOCTL2),
 	MAX8925_REG_RESOURCE(LDOCTL3, LDOCTL3),
 	MAX8925_REG_RESOURCE(LDOCTL4, LDOCTL4),
 	MAX8925_REG_RESOURCE(LDOCTL5, LDOCTL5),
 	MAX8925_REG_RESOURCE(LDOCTL6, LDOCTL6),
 	MAX8925_REG_RESOURCE(LDOCTL7, LDOCTL7),
 	MAX8925_REG_RESOURCE(LDOCTL8, LDOCTL8),
 	MAX8925_REG_RESOURCE(LDOCTL9, LDOCTL9),
 	MAX8925_REG_RESOURCE(LDOCTL10, LDOCTL10),
 	MAX8925_REG_RESOURCE(LDOCTL11, LDOCTL11),
 	MAX8925_REG_RESOURCE(LDOCTL12, LDOCTL12),
 	MAX8925_REG_RESOURCE(LDOCTL13, LDOCTL13),
 	MAX8925_REG_RESOURCE(LDOCTL14, LDOCTL14),
 	MAX8925_REG_RESOURCE(LDOCTL15, LDOCTL15),
 	MAX8925_REG_RESOURCE(LDOCTL16, LDOCTL16),
 	MAX8925_REG_RESOURCE(LDOCTL17, LDOCTL17),
 	MAX8925_REG_RESOURCE(LDOCTL18, LDOCTL18),
 	MAX8925_REG_RESOURCE(LDOCTL19, LDOCTL19),
 	MAX8925_REG_RESOURCE(LDOCTL20, LDOCTL20),
 };

 #define MAX8925_REG_DEVS(_id)						\
 {									\
 	.name		= "max8925-regulator",				\
 	.num_resources	= 1,						\
 	.resources	= &regulator_resources[MAX8925_ID_##_id],	\
 	.id		= MAX8925_ID_##_id,				\
 }

 static struct mfd_cell regulator_devs[] = {
 	MAX8925_REG_DEVS(SD1),
 	MAX8925_REG_DEVS(SD2),
 	MAX8925_REG_DEVS(SD3),
 	MAX8925_REG_DEVS(LDO1),
 	MAX8925_REG_DEVS(LDO2),
 	MAX8925_REG_DEVS(LDO3),
 	MAX8925_REG_DEVS(LDO4),
 	MAX8925_REG_DEVS(LDO5),
 	MAX8925_REG_DEVS(LDO6),
 	MAX8925_REG_DEVS(LDO7),
 	MAX8925_REG_DEVS(LDO8),
 	MAX8925_REG_DEVS(LDO9),
 	MAX8925_REG_DEVS(LDO10),
 	MAX8925_REG_DEVS(LDO11),
 	MAX8925_REG_DEVS(LDO12),
 	MAX8925_REG_DEVS(LDO13),
 	MAX8925_REG_DEVS(LDO14),
 	MAX8925_REG_DEVS(LDO15),
 	MAX8925_REG_DEVS(LDO16),
 	MAX8925_REG_DEVS(LDO17),
 	MAX8925_REG_DEVS(LDO18),
 	MAX8925_REG_DEVS(LDO19),
 	MAX8925_REG_DEVS(LDO20),
 };

 enum {
 	FLAGS_ADC = 1,	/* register in ADC component */
 	FLAGS_RTC,	/* register in RTC component */
 };

 struct max8925_irq_data {
 	int	reg;
 	int	mask_reg;
 	int	enable;		/* enable or not */
 	int	offs;		/* bit offset in mask register */
 	int	flags;
 	int	tsc_irq;
 };

 static struct max8925_irq_data max8925_irqs[] = {
 	[MAX8925_IRQ_VCHG_DC_OVP] = {
 		.reg		= MAX8925_CHG_IRQ1,
 		.mask_reg	= MAX8925_CHG_IRQ1_MASK,
 		.offs		= 1 << 0,
 	},
 	[MAX8925_IRQ_VCHG_DC_F] = {
 		.reg		= MAX8925_CHG_IRQ1,
 		.mask_reg	= MAX8925_CHG_IRQ1_MASK,
 		.offs		= 1 << 1,
 	},
 	[MAX8925_IRQ_VCHG_DC_R] = {
 		.reg		= MAX8925_CHG_IRQ1,
 		.mask_reg	= MAX8925_CHG_IRQ1_MASK,
 		.offs		= 1 << 2,
 	},
 	[MAX8925_IRQ_VCHG_USB_OVP] = {
 		.reg		= MAX8925_CHG_IRQ1,
 		.mask_reg	= MAX8925_CHG_IRQ1_MASK,
 		.offs		= 1 << 3,
 	},
 	[MAX8925_IRQ_VCHG_USB_F] =  {
 		.reg		= MAX8925_CHG_IRQ1,
 		.mask_reg	= MAX8925_CHG_IRQ1_MASK,
 		.offs		= 1 << 4,
 	},
 	[MAX8925_IRQ_VCHG_USB_R] = {
 		.reg		= MAX8925_CHG_IRQ1,
 		.mask_reg	= MAX8925_CHG_IRQ1_MASK,
 		.offs		= 1 << 5,
 	},
 	[MAX8925_IRQ_VCHG_THM_OK_R] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 0,
 	},
 	[MAX8925_IRQ_VCHG_THM_OK_F] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 1,
 	},
 	[MAX8925_IRQ_VCHG_SYSLOW_F] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 2,
 	},
 	[MAX8925_IRQ_VCHG_SYSLOW_R] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 3,
 	},
 	[MAX8925_IRQ_VCHG_RST] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 4,
 	},
 	[MAX8925_IRQ_VCHG_DONE] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 5,
 	},
 	[MAX8925_IRQ_VCHG_TOPOFF] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 6,
 	},
 	[MAX8925_IRQ_VCHG_TMR_FAULT] = {
 		.reg		= MAX8925_CHG_IRQ2,
 		.mask_reg	= MAX8925_CHG_IRQ2_MASK,
 		.offs		= 1 << 7,
 	},
 	[MAX8925_IRQ_GPM_RSTIN] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 0,
 	},
 	[MAX8925_IRQ_GPM_MPL] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 1,
 	},
 	[MAX8925_IRQ_GPM_SW_3SEC] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 2,
 	},
 	[MAX8925_IRQ_GPM_EXTON_F] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 3,
 	},
 	[MAX8925_IRQ_GPM_EXTON_R] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 4,
 	},
 	[MAX8925_IRQ_GPM_SW_1SEC] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 5,
 	},
 	[MAX8925_IRQ_GPM_SW_F] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 6,
 	},
 	[MAX8925_IRQ_GPM_SW_R] = {
 		.reg		= MAX8925_ON_OFF_IRQ1,
 		.mask_reg	= MAX8925_ON_OFF_IRQ1_MASK,
 		.offs		= 1 << 7,
 	},
 	[MAX8925_IRQ_GPM_SYSCKEN_F] = {
 		.reg		= MAX8925_ON_OFF_IRQ2,
 		.mask_reg	= MAX8925_ON_OFF_IRQ2_MASK,
 		.offs		= 1 << 0,
 	},
 	[MAX8925_IRQ_GPM_SYSCKEN_R] = {
 		.reg		= MAX8925_ON_OFF_IRQ2,
 		.mask_reg	= MAX8925_ON_OFF_IRQ2_MASK,
 		.offs		= 1 << 1,
 	},
 	[MAX8925_IRQ_RTC_ALARM1] = {
 		.reg		= MAX8925_RTC_IRQ,
 		.mask_reg	= MAX8925_RTC_IRQ_MASK,
 		.offs		= 1 << 2,
 		.flags		= FLAGS_RTC,
 	},
 	[MAX8925_IRQ_RTC_ALARM0] = {
 		.reg		= MAX8925_RTC_IRQ,
 		.mask_reg	= MAX8925_RTC_IRQ_MASK,
 		.offs		= 1 << 3,
 		.flags		= FLAGS_RTC,
 	},
 	[MAX8925_IRQ_TSC_STICK] = {
 		.reg		= MAX8925_TSC_IRQ,
 		.mask_reg	= MAX8925_TSC_IRQ_MASK,
 		.offs		= 1 << 0,
 		.flags		= FLAGS_ADC,
 		.tsc_irq	= 1,
 	},
 	[MAX8925_IRQ_TSC_NSTICK] = {
 		.reg		= MAX8925_TSC_IRQ,
 		.mask_reg	= MAX8925_TSC_IRQ_MASK,
 		.offs		= 1 << 1,
 		.flags		= FLAGS_ADC,
 		.tsc_irq	= 1,
 	},
 };

 static inline struct max8925_irq_data *irq_to_max8925(struct max8925_chip *chip,
 						      int irq)
 {
 	return &max8925_irqs[irq - chip->irq_base];
 }

 static irqreturn_t max8925_irq(int irq, void *data)
 {
 	struct max8925_chip *chip = data;
 	struct max8925_irq_data *irq_data;
 	struct i2c_client *i2c;
 	int read_reg = -1, value = 0;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
 		irq_data = &max8925_irqs[i];
 		/* TSC IRQ should be serviced in max8925_tsc_irq() */
 		if (irq_data->tsc_irq)
 			continue;
 		if (irq_data->flags == FLAGS_RTC)
 			i2c = chip->rtc;
 		else if (irq_data->flags == FLAGS_ADC)
 			i2c = chip->adc;
 		else
 			i2c = chip->i2c;
 		if (read_reg != irq_data->reg) {
 			read_reg = irq_data->reg;
 			value = max8925_reg_read(i2c, irq_data->reg);
 		}
 		if (value & irq_data->enable)
 			handle_nested_irq(chip->irq_base + i);
 	}
 	return IRQ_HANDLED;
 }

 static irqreturn_t max8925_tsc_irq(int irq, void *data)
 {
 	struct max8925_chip *chip = data;
 	struct max8925_irq_data *irq_data;
 	struct i2c_client *i2c;
 	int read_reg = -1, value = 0;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
 		irq_data = &max8925_irqs[i];
 		/* non TSC IRQ should be serviced in max8925_irq() */
 		if (!irq_data->tsc_irq)
 			continue;
 		if (irq_data->flags == FLAGS_RTC)
 			i2c = chip->rtc;
 		else if (irq_data->flags == FLAGS_ADC)
 			i2c = chip->adc;
 		else
 			i2c = chip->i2c;
 		if (read_reg != irq_data->reg) {
 			read_reg = irq_data->reg;
 			value = max8925_reg_read(i2c, irq_data->reg);
 		}
 		if (value & irq_data->enable)
 			handle_nested_irq(chip->irq_base + i);
 	}
 	return IRQ_HANDLED;
 }

 static void max8925_irq_lock(unsigned int irq)
 {
 	struct max8925_chip *chip = get_irq_chip_data(irq);

 	mutex_lock(&chip->irq_lock);
 }

 static void max8925_irq_sync_unlock(unsigned int irq)
 {
 	struct max8925_chip *chip = get_irq_chip_data(irq);
 	struct max8925_irq_data *irq_data;
 	static unsigned char cache_chg[2] = {0xff, 0xff};
 	static unsigned char cache_on[2] = {0xff, 0xff};
 	static unsigned char cache_rtc = 0xff, cache_tsc = 0xff;
 	unsigned char irq_chg[2], irq_on[2];
 	unsigned char irq_rtc, irq_tsc;
 	int i;

 	/* Load cached value. In initial, all IRQs are masked */
 	irq_chg[0] = cache_chg[0];
 	irq_chg[1] = cache_chg[1];
 	irq_on[0] = cache_on[0];
 	irq_on[1] = cache_on[1];
 	irq_rtc = cache_rtc;
 	irq_tsc = cache_tsc;
 	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
 		irq_data = &max8925_irqs[i];
 		switch (irq_data->mask_reg) {
 		case MAX8925_CHG_IRQ1_MASK:
 			irq_chg[0] &= irq_data->enable;
 			break;
 		case MAX8925_CHG_IRQ2_MASK:
 			irq_chg[1] &= irq_data->enable;
 			break;
 		case MAX8925_ON_OFF_IRQ1_MASK:
 			irq_on[0] &= irq_data->enable;
 			break;
 		case MAX8925_ON_OFF_IRQ2_MASK:
 			irq_on[1] &= irq_data->enable;
 			break;
 		case MAX8925_RTC_IRQ_MASK:
 			irq_rtc &= irq_data->enable;
 			break;
 		case MAX8925_TSC_IRQ_MASK:
 			irq_tsc &= irq_data->enable;
 			break;
 		default:
 			dev_err(chip->dev, "wrong IRQ\n");
 			break;
 		}
 	}
 	/* update mask into registers */
 	if (cache_chg[0] != irq_chg[0]) {
 		cache_chg[0] = irq_chg[0];
 		max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK,
 			irq_chg[0]);
 	}
 	if (cache_chg[1] != irq_chg[1]) {
 		cache_chg[1] = irq_chg[1];
 		max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK,
 			irq_chg[1]);
 	}
 	if (cache_on[0] != irq_on[0]) {
 		cache_on[0] = irq_on[0];
 		max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK,
 				irq_on[0]);
 	}
 	if (cache_on[1] != irq_on[1]) {
 		cache_on[1] = irq_on[1];
 		max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK,
 				irq_on[1]);
 	}
 	if (cache_rtc != irq_rtc) {
 		cache_rtc = irq_rtc;
 		max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, irq_rtc);
 	}
 	if (cache_tsc != irq_tsc) {
 		cache_tsc = irq_tsc;
 		max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, irq_tsc);
 	}

 	mutex_unlock(&chip->irq_lock);
 }

 static void max8925_irq_enable(unsigned int irq)
 {
 	struct max8925_chip *chip = get_irq_chip_data(irq);
 	max8925_irqs[irq - chip->irq_base].enable
 		= max8925_irqs[irq - chip->irq_base].offs;
 }

 static void max8925_irq_disable(unsigned int irq)
 {
 	struct max8925_chip *chip = get_irq_chip_data(irq);
 	max8925_irqs[irq - chip->irq_base].enable = 0;
 }

 static struct irq_chip max8925_irq_chip = {
 	.name		= "max8925",
 	.bus_lock	= max8925_irq_lock,
 	.bus_sync_unlock = max8925_irq_sync_unlock,
 	.enable		= max8925_irq_enable,
 	.disable	= max8925_irq_disable,
 };

 static int max8925_irq_init(struct max8925_chip *chip, int irq,
 			    struct max8925_platform_data *pdata)
 {
 	unsigned long flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
 	struct irq_desc *desc;
 	int i, ret;
 	int __irq;

 	if (!pdata || !pdata->irq_base) {
 		dev_warn(chip->dev, "No interrupt support on IRQ base\n");
 		return -EINVAL;
 	}
 	/* clear all interrupts */
 	max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ1);
 	max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ2);
 	max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ1);
 	max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ2);
 	max8925_reg_read(chip->rtc, MAX8925_RTC_IRQ);
 	max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
 	/* mask all interrupts */
 	max8925_reg_write(chip->rtc, MAX8925_ALARM0_CNTL, 0);
 	max8925_reg_write(chip->rtc, MAX8925_ALARM1_CNTL, 0);
 	max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK, 0xff);
 	max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK, 0xff);
 	max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff);
 	max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK, 0xff);
 	max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, 0xff);
 	max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, 0xff);

 	mutex_init(&chip->irq_lock);
 	chip->core_irq = irq;
 	chip->irq_base = pdata->irq_base;
 	desc = irq_to_desc(chip->core_irq);

 	/* register with genirq */
 	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
 		__irq = i + chip->irq_base;
 		set_irq_chip_data(__irq, chip);
 		set_irq_chip_and_handler(__irq, &max8925_irq_chip,
 					 handle_edge_irq);
 		set_irq_nested_thread(__irq, 1);
 #ifdef CONFIG_ARM
 		set_irq_flags(__irq, IRQF_VALID);
 #else
 		set_irq_noprobe(__irq);
 #endif
 	}
 	if (!irq) {
 		dev_warn(chip->dev, "No interrupt support on core IRQ\n");
 		goto tsc_irq;
 	}

 	ret = request_threaded_irq(irq, NULL, max8925_irq, flags,
 				   "max8925", chip);
 	if (ret) {
 		dev_err(chip->dev, "Failed to request core IRQ: %d\n", ret);
 		chip->core_irq = 0;
 	}
 tsc_irq:
 	if (!pdata->tsc_irq) {
 		dev_warn(chip->dev, "No interrupt support on TSC IRQ\n");
 		return 0;
 	}
 	chip->tsc_irq = pdata->tsc_irq;

 	ret = request_threaded_irq(chip->tsc_irq, NULL, max8925_tsc_irq,
 				   flags, "max8925-tsc", chip);
 	if (ret) {
 		dev_err(chip->dev, "Failed to request TSC IRQ: %d\n", ret);
 		chip->tsc_irq = 0;
 	}
 	return 0;
 }

 int __devinit max8925_device_init(struct max8925_chip *chip,
 				  struct max8925_platform_data *pdata)
 {
 	int ret;

 	max8925_irq_init(chip, chip->i2c->irq, pdata);

 	if (pdata && (pdata->power || pdata->touch)) {
 		/* enable ADC to control internal reference */
 		max8925_set_bits(chip->i2c, MAX8925_RESET_CNFG, 1, 1);
 		/* enable internal reference for ADC */
 		max8925_set_bits(chip->adc, MAX8925_TSC_CNFG1, 3, 2);
 		/* check for internal reference IRQ */
 		do {
 			ret = max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
 		} while (ret & MAX8925_NREF_OK);
 		/* enaable ADC scheduler, interval is 1 second */
 		max8925_set_bits(chip->adc, MAX8925_ADC_SCHED, 3, 2);
 	}

 	/* enable Momentary Power Loss */
 	max8925_set_bits(chip->rtc, MAX8925_MPL_CNTL, 1 << 4, 1 << 4);

 	ret = mfd_add_devices(chip->dev, 0, &rtc_devs[0],
 			      ARRAY_SIZE(rtc_devs),
 			      &rtc_resources[0], 0);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to add rtc subdev\n");
 		goto out;
 	}
 	if (pdata && pdata->regulator[0]) {
 		ret = mfd_add_devices(chip->dev, 0, &regulator_devs[0],
 				      ARRAY_SIZE(regulator_devs),
 				      &regulator_resources[0], 0);
 		if (ret < 0) {
 			dev_err(chip->dev, "Failed to add regulator subdev\n");
 			goto out_dev;
 		}
 	}

 	if (pdata && pdata->backlight) {
 		ret = mfd_add_devices(chip->dev, 0, &backlight_devs[0],
 				      ARRAY_SIZE(backlight_devs),
 				      &backlight_resources[0], 0);
 		if (ret < 0) {
 			dev_err(chip->dev, "Failed to add backlight subdev\n");
 			goto out_dev;
 		}
 	}

 	if (pdata && pdata->power) {
 		ret = mfd_add_devices(chip->dev, 0, &power_devs[0],
 					ARRAY_SIZE(power_devs),
 					&power_supply_resources[0], 0);
 		if (ret < 0) {
 			dev_err(chip->dev, "Failed to add power supply "
 				"subdev\n");
 			goto out_dev;
 		}
 	}

 	if (pdata && pdata->touch) {
 		ret = mfd_add_devices(chip->dev, 0, &touch_devs[0],
 				      ARRAY_SIZE(touch_devs),
 				      &touch_resources[0], 0);
 		if (ret < 0) {
 			dev_err(chip->dev, "Failed to add touch subdev\n");
 			goto out_dev;
 		}
 	}

 	return 0;
 out_dev:
 	mfd_remove_devices(chip->dev);
 out:
 	return ret;
 }

 void __devexit max8925_device_exit(struct max8925_chip *chip)
 {
 	if (chip->core_irq)
 		free_irq(chip->core_irq, chip);
 	if (chip->tsc_irq)
 		free_irq(chip->tsc_irq, chip);
 	mfd_remove_devices(chip->dev);
 }


 MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
 MODULE_LICENSE("GPL");
	/*
	* Base driver for Maxim MAX8925
	*
	* Copyright (C) 2009-2010 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/max8925.h>

	static struct resource backlight_resources[] = {
	{
	.name = "max8925-backlight",
	.start = MAX8925_WLED_MODE_CNTL,
	.end = MAX8925_WLED_CNTL,
	.flags = IORESOURCE_IO,
	},
	};

	static struct mfd_cell backlight_devs[] = {
	{
	.name = "max8925-backlight",
	.num_resources = 1,
	.resources = &backlight_resources[0],
	.id = -1,
	},
	};

	static struct resource touch_resources[] = {
	{
	.name = "max8925-tsc",
	.start = MAX8925_TSC_IRQ,
	.end = MAX8925_ADC_RES_END,
	.flags = IORESOURCE_IO,
	},
	};

	static struct mfd_cell touch_devs[] = {
	{
	.name = "max8925-touch",
	.num_resources = 1,
	.resources = &touch_resources[0],
	.id = -1,
	},
	};

	static struct resource power_supply_resources[] = {
	{
	.name = "max8925-power",
	.start = MAX8925_CHG_IRQ1,
	.end = MAX8925_CHG_IRQ1_MASK,
	.flags = IORESOURCE_IO,
	},
	};

	static struct mfd_cell power_devs[] = {
	{
	.name = "max8925-power",
	.num_resources = 1,
	.resources = &power_supply_resources[0],
	.id = -1,
	},
	};

	static struct resource rtc_resources[] = {
	{
	.name = "max8925-rtc",
	.start = MAX8925_RTC_IRQ,
	.end = MAX8925_RTC_IRQ_MASK,
	.flags = IORESOURCE_IO,
	},
	};

	static struct mfd_cell rtc_devs[] = {
	{
	.name = "max8925-rtc",
	.num_resources = 1,
	.resources = &rtc_resources[0],
	.id = -1,
	},
	};

	#define MAX8925_REG_RESOURCE(_start, _end) \
	{ \
	.start = MAX8925_##_start, \
	.end = MAX8925_##_end, \
	.flags = IORESOURCE_IO, \
	}

	static struct resource regulator_resources[] = {
	MAX8925_REG_RESOURCE(SDCTL1, SDCTL1),
	MAX8925_REG_RESOURCE(SDCTL2, SDCTL2),
	MAX8925_REG_RESOURCE(SDCTL3, SDCTL3),
	MAX8925_REG_RESOURCE(LDOCTL1, LDOCTL1),
	MAX8925_REG_RESOURCE(LDOCTL2, LDOCTL2),
	MAX8925_REG_RESOURCE(LDOCTL3, LDOCTL3),
	MAX8925_REG_RESOURCE(LDOCTL4, LDOCTL4),
	MAX8925_REG_RESOURCE(LDOCTL5, LDOCTL5),
	MAX8925_REG_RESOURCE(LDOCTL6, LDOCTL6),
	MAX8925_REG_RESOURCE(LDOCTL7, LDOCTL7),
	MAX8925_REG_RESOURCE(LDOCTL8, LDOCTL8),
	MAX8925_REG_RESOURCE(LDOCTL9, LDOCTL9),
	MAX8925_REG_RESOURCE(LDOCTL10, LDOCTL10),
	MAX8925_REG_RESOURCE(LDOCTL11, LDOCTL11),
	MAX8925_REG_RESOURCE(LDOCTL12, LDOCTL12),
	MAX8925_REG_RESOURCE(LDOCTL13, LDOCTL13),
	MAX8925_REG_RESOURCE(LDOCTL14, LDOCTL14),
	MAX8925_REG_RESOURCE(LDOCTL15, LDOCTL15),
	MAX8925_REG_RESOURCE(LDOCTL16, LDOCTL16),
	MAX8925_REG_RESOURCE(LDOCTL17, LDOCTL17),
	MAX8925_REG_RESOURCE(LDOCTL18, LDOCTL18),
	MAX8925_REG_RESOURCE(LDOCTL19, LDOCTL19),
	MAX8925_REG_RESOURCE(LDOCTL20, LDOCTL20),
	};

	#define MAX8925_REG_DEVS(_id) \
	{ \
	.name = "max8925-regulator", \
	.num_resources = 1, \
	.resources = &regulator_resources[MAX8925_ID_##_id], \
	.id = MAX8925_ID_##_id, \
	}

	static struct mfd_cell regulator_devs[] = {
	MAX8925_REG_DEVS(SD1),
	MAX8925_REG_DEVS(SD2),
	MAX8925_REG_DEVS(SD3),
	MAX8925_REG_DEVS(LDO1),
	MAX8925_REG_DEVS(LDO2),
	MAX8925_REG_DEVS(LDO3),
	MAX8925_REG_DEVS(LDO4),
	MAX8925_REG_DEVS(LDO5),
	MAX8925_REG_DEVS(LDO6),
	MAX8925_REG_DEVS(LDO7),
	MAX8925_REG_DEVS(LDO8),
	MAX8925_REG_DEVS(LDO9),
	MAX8925_REG_DEVS(LDO10),
	MAX8925_REG_DEVS(LDO11),
	MAX8925_REG_DEVS(LDO12),
	MAX8925_REG_DEVS(LDO13),
	MAX8925_REG_DEVS(LDO14),
	MAX8925_REG_DEVS(LDO15),
	MAX8925_REG_DEVS(LDO16),
	MAX8925_REG_DEVS(LDO17),
	MAX8925_REG_DEVS(LDO18),
	MAX8925_REG_DEVS(LDO19),
	MAX8925_REG_DEVS(LDO20),
	};

	enum {
	FLAGS_ADC = 1, /* register in ADC component */
	FLAGS_RTC, /* register in RTC component */
	};

	struct max8925_irq_data {
	int reg;
	int mask_reg;
	int enable; /* enable or not */
	int offs; /* bit offset in mask register */
	int flags;
	int tsc_irq;
	};

	static struct max8925_irq_data max8925_irqs[] = {
	[MAX8925_IRQ_VCHG_DC_OVP] = {
	.reg = MAX8925_CHG_IRQ1,
	.mask_reg = MAX8925_CHG_IRQ1_MASK,
	.offs = 1 << 0,
	},
	[MAX8925_IRQ_VCHG_DC_F] = {
	.reg = MAX8925_CHG_IRQ1,
	.mask_reg = MAX8925_CHG_IRQ1_MASK,
	.offs = 1 << 1,
	},
	[MAX8925_IRQ_VCHG_DC_R] = {
	.reg = MAX8925_CHG_IRQ1,
	.mask_reg = MAX8925_CHG_IRQ1_MASK,
	.offs = 1 << 2,
	},
	[MAX8925_IRQ_VCHG_USB_OVP] = {
	.reg = MAX8925_CHG_IRQ1,
	.mask_reg = MAX8925_CHG_IRQ1_MASK,
	.offs = 1 << 3,
	},
	[MAX8925_IRQ_VCHG_USB_F] = {
	.reg = MAX8925_CHG_IRQ1,
	.mask_reg = MAX8925_CHG_IRQ1_MASK,
	.offs = 1 << 4,
	},
	[MAX8925_IRQ_VCHG_USB_R] = {
	.reg = MAX8925_CHG_IRQ1,
	.mask_reg = MAX8925_CHG_IRQ1_MASK,
	.offs = 1 << 5,
	},
	[MAX8925_IRQ_VCHG_THM_OK_R] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 0,
	},
	[MAX8925_IRQ_VCHG_THM_OK_F] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 1,
	},
	[MAX8925_IRQ_VCHG_SYSLOW_F] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 2,
	},
	[MAX8925_IRQ_VCHG_SYSLOW_R] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 3,
	},
	[MAX8925_IRQ_VCHG_RST] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 4,
	},
	[MAX8925_IRQ_VCHG_DONE] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 5,
	},
	[MAX8925_IRQ_VCHG_TOPOFF] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 6,
	},
	[MAX8925_IRQ_VCHG_TMR_FAULT] = {
	.reg = MAX8925_CHG_IRQ2,
	.mask_reg = MAX8925_CHG_IRQ2_MASK,
	.offs = 1 << 7,
	},
	[MAX8925_IRQ_GPM_RSTIN] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 0,
	},
	[MAX8925_IRQ_GPM_MPL] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 1,
	},
	[MAX8925_IRQ_GPM_SW_3SEC] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 2,
	},
	[MAX8925_IRQ_GPM_EXTON_F] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 3,
	},
	[MAX8925_IRQ_GPM_EXTON_R] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 4,
	},
	[MAX8925_IRQ_GPM_SW_1SEC] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 5,
	},
	[MAX8925_IRQ_GPM_SW_F] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 6,
	},
	[MAX8925_IRQ_GPM_SW_R] = {
	.reg = MAX8925_ON_OFF_IRQ1,
	.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
	.offs = 1 << 7,
	},
	[MAX8925_IRQ_GPM_SYSCKEN_F] = {
	.reg = MAX8925_ON_OFF_IRQ2,
	.mask_reg = MAX8925_ON_OFF_IRQ2_MASK,
	.offs = 1 << 0,
	},
	[MAX8925_IRQ_GPM_SYSCKEN_R] = {
	.reg = MAX8925_ON_OFF_IRQ2,
	.mask_reg = MAX8925_ON_OFF_IRQ2_MASK,
	.offs = 1 << 1,
	},
	[MAX8925_IRQ_RTC_ALARM1] = {
	.reg = MAX8925_RTC_IRQ,
	.mask_reg = MAX8925_RTC_IRQ_MASK,
	.offs = 1 << 2,
	.flags = FLAGS_RTC,
	},
	[MAX8925_IRQ_RTC_ALARM0] = {
	.reg = MAX8925_RTC_IRQ,
	.mask_reg = MAX8925_RTC_IRQ_MASK,
	.offs = 1 << 3,
	.flags = FLAGS_RTC,
	},
	[MAX8925_IRQ_TSC_STICK] = {
	.reg = MAX8925_TSC_IRQ,
	.mask_reg = MAX8925_TSC_IRQ_MASK,
	.offs = 1 << 0,
	.flags = FLAGS_ADC,
	.tsc_irq = 1,
	},
	[MAX8925_IRQ_TSC_NSTICK] = {
	.reg = MAX8925_TSC_IRQ,
	.mask_reg = MAX8925_TSC_IRQ_MASK,
	.offs = 1 << 1,
	.flags = FLAGS_ADC,
	.tsc_irq = 1,
	},
	};

	static inline struct max8925_irq_data irq_to_max8925(struct max8925_chip chip,
	int irq)
	{
	return &max8925_irqs[irq - chip->irq_base];
	}

	static irqreturn_t max8925_irq(int irq, void *data)
	{
	struct max8925_chip *chip = data;
	struct max8925_irq_data *irq_data;
	struct i2c_client *i2c;
	int read_reg = -1, value = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
	irq_data = &max8925_irqs[i];
	/* TSC IRQ should be serviced in max8925_tsc_irq() */
	if (irq_data->tsc_irq)
	continue;
	if (irq_data->flags == FLAGS_RTC)
	i2c = chip->rtc;
	else if (irq_data->flags == FLAGS_ADC)
	i2c = chip->adc;
	else
	i2c = chip->i2c;
	if (read_reg != irq_data->reg) {
	read_reg = irq_data->reg;
	value = max8925_reg_read(i2c, irq_data->reg);
	}
	if (value & irq_data->enable)
	handle_nested_irq(chip->irq_base + i);
	}
	return IRQ_HANDLED;
	}

	static irqreturn_t max8925_tsc_irq(int irq, void *data)
	{
	struct max8925_chip *chip = data;
	struct max8925_irq_data *irq_data;
	struct i2c_client *i2c;
	int read_reg = -1, value = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
	irq_data = &max8925_irqs[i];
	/* non TSC IRQ should be serviced in max8925_irq() */
	if (!irq_data->tsc_irq)
	continue;
	if (irq_data->flags == FLAGS_RTC)
	i2c = chip->rtc;
	else if (irq_data->flags == FLAGS_ADC)
	i2c = chip->adc;
	else
	i2c = chip->i2c;
	if (read_reg != irq_data->reg) {
	read_reg = irq_data->reg;
	value = max8925_reg_read(i2c, irq_data->reg);
	}
	if (value & irq_data->enable)
	handle_nested_irq(chip->irq_base + i);
	}
	return IRQ_HANDLED;
	}

	static void max8925_irq_lock(unsigned int irq)
	{
	struct max8925_chip *chip = get_irq_chip_data(irq);

	mutex_lock(&chip->irq_lock);
	}

	static void max8925_irq_sync_unlock(unsigned int irq)
	{
	struct max8925_chip *chip = get_irq_chip_data(irq);
	struct max8925_irq_data *irq_data;
	static unsigned char cache_chg[2] = {0xff, 0xff};
	static unsigned char cache_on[2] = {0xff, 0xff};
	static unsigned char cache_rtc = 0xff, cache_tsc = 0xff;
	unsigned char irq_chg[2], irq_on[2];
	unsigned char irq_rtc, irq_tsc;
	int i;

	/* Load cached value. In initial, all IRQs are masked */
	irq_chg[0] = cache_chg[0];
	irq_chg[1] = cache_chg[1];
	irq_on[0] = cache_on[0];
	irq_on[1] = cache_on[1];
	irq_rtc = cache_rtc;
	irq_tsc = cache_tsc;
	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
	irq_data = &max8925_irqs[i];
	switch (irq_data->mask_reg) {
	case MAX8925_CHG_IRQ1_MASK:
	irq_chg[0] &= irq_data->enable;
	break;
	case MAX8925_CHG_IRQ2_MASK:
	irq_chg[1] &= irq_data->enable;
	break;
	case MAX8925_ON_OFF_IRQ1_MASK:
	irq_on[0] &= irq_data->enable;
	break;
	case MAX8925_ON_OFF_IRQ2_MASK:
	irq_on[1] &= irq_data->enable;
	break;
	case MAX8925_RTC_IRQ_MASK:
	irq_rtc &= irq_data->enable;
	break;
	case MAX8925_TSC_IRQ_MASK:
	irq_tsc &= irq_data->enable;
	break;
	default:
	dev_err(chip->dev, "wrong IRQ\n");
	break;
	}
	}
	/* update mask into registers */
	if (cache_chg[0] != irq_chg[0]) {
	cache_chg[0] = irq_chg[0];
	max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK,
	irq_chg[0]);
	}
	if (cache_chg[1] != irq_chg[1]) {
	cache_chg[1] = irq_chg[1];
	max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK,
	irq_chg[1]);
	}
	if (cache_on[0] != irq_on[0]) {
	cache_on[0] = irq_on[0];
	max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK,
	irq_on[0]);
	}
	if (cache_on[1] != irq_on[1]) {
	cache_on[1] = irq_on[1];
	max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK,
	irq_on[1]);
	}
	if (cache_rtc != irq_rtc) {
	cache_rtc = irq_rtc;
	max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, irq_rtc);
	}
	if (cache_tsc != irq_tsc) {
	cache_tsc = irq_tsc;
	max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, irq_tsc);
	}

	mutex_unlock(&chip->irq_lock);
	}

	static void max8925_irq_enable(unsigned int irq)
	{
	struct max8925_chip *chip = get_irq_chip_data(irq);
	max8925_irqs[irq - chip->irq_base].enable
	= max8925_irqs[irq - chip->irq_base].offs;
	}

	static void max8925_irq_disable(unsigned int irq)
	{
	struct max8925_chip *chip = get_irq_chip_data(irq);
	max8925_irqs[irq - chip->irq_base].enable = 0;
	}

	static struct irq_chip max8925_irq_chip = {
	.name = "max8925",
	.bus_lock = max8925_irq_lock,
	.bus_sync_unlock = max8925_irq_sync_unlock,
	.enable = max8925_irq_enable,
	.disable = max8925_irq_disable,
	};

	static int max8925_irq_init(struct max8925_chip *chip, int irq,
	struct max8925_platform_data *pdata)
	{
	unsigned long flags = IRQF_TRIGGER_FALLING \| IRQF_ONESHOT;
	struct irq_desc *desc;
	int i, ret;
	int __irq;

	if (!pdata \|\| !pdata->irq_base) {
	dev_warn(chip->dev, "No interrupt support on IRQ base\n");
	return -EINVAL;
	}
	/* clear all interrupts */
	max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ1);
	max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ2);
	max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ1);
	max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ2);
	max8925_reg_read(chip->rtc, MAX8925_RTC_IRQ);
	max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
	/* mask all interrupts */
	max8925_reg_write(chip->rtc, MAX8925_ALARM0_CNTL, 0);
	max8925_reg_write(chip->rtc, MAX8925_ALARM1_CNTL, 0);
	max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK, 0xff);
	max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK, 0xff);
	max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff);
	max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK, 0xff);
	max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, 0xff);
	max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, 0xff);

	mutex_init(&chip->irq_lock);
	chip->core_irq = irq;
	chip->irq_base = pdata->irq_base;
	desc = irq_to_desc(chip->core_irq);

	/* register with genirq */
	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
	__irq = i + chip->irq_base;
	set_irq_chip_data(__irq, chip);
	set_irq_chip_and_handler(__irq, &max8925_irq_chip,
	handle_edge_irq);
	set_irq_nested_thread(__irq, 1);
	#ifdef CONFIG_ARM
	set_irq_flags(__irq, IRQF_VALID);
	#else
	set_irq_noprobe(__irq);
	#endif
	}
	if (!irq) {
	dev_warn(chip->dev, "No interrupt support on core IRQ\n");
	goto tsc_irq;
	}

	ret = request_threaded_irq(irq, NULL, max8925_irq, flags,
	"max8925", chip);
	if (ret) {
	dev_err(chip->dev, "Failed to request core IRQ: %d\n", ret);
	chip->core_irq = 0;
	}
	tsc_irq:
	if (!pdata->tsc_irq) {
	dev_warn(chip->dev, "No interrupt support on TSC IRQ\n");
	return 0;
	}
	chip->tsc_irq = pdata->tsc_irq;

	ret = request_threaded_irq(chip->tsc_irq, NULL, max8925_tsc_irq,
	flags, "max8925-tsc", chip);
	if (ret) {
	dev_err(chip->dev, "Failed to request TSC IRQ: %d\n", ret);
	chip->tsc_irq = 0;
	}
	return 0;
	}

	int __devinit max8925_device_init(struct max8925_chip *chip,
	struct max8925_platform_data *pdata)
	{
	int ret;

	max8925_irq_init(chip, chip->i2c->irq, pdata);

	if (pdata && (pdata->power \|\| pdata->touch)) {
	/* enable ADC to control internal reference */
	max8925_set_bits(chip->i2c, MAX8925_RESET_CNFG, 1, 1);
	/* enable internal reference for ADC */
	max8925_set_bits(chip->adc, MAX8925_TSC_CNFG1, 3, 2);
	/* check for internal reference IRQ */
	do {
	ret = max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
	} while (ret & MAX8925_NREF_OK);
	/* enaable ADC scheduler, interval is 1 second */
	max8925_set_bits(chip->adc, MAX8925_ADC_SCHED, 3, 2);
	}

	/* enable Momentary Power Loss */
	max8925_set_bits(chip->rtc, MAX8925_MPL_CNTL, 1 << 4, 1 << 4);

	ret = mfd_add_devices(chip->dev, 0, &rtc_devs[0],
	ARRAY_SIZE(rtc_devs),
	&rtc_resources[0], 0);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add rtc subdev\n");
	goto out;
	}
	if (pdata && pdata->regulator[0]) {
	ret = mfd_add_devices(chip->dev, 0, &regulator_devs[0],
	ARRAY_SIZE(regulator_devs),
	&regulator_resources[0], 0);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add regulator subdev\n");
	goto out_dev;
	}
	}

	if (pdata && pdata->backlight) {
	ret = mfd_add_devices(chip->dev, 0, &backlight_devs[0],
	ARRAY_SIZE(backlight_devs),
	&backlight_resources[0], 0);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add backlight subdev\n");
	goto out_dev;
	}
	}

	if (pdata && pdata->power) {
	ret = mfd_add_devices(chip->dev, 0, &power_devs[0],
	ARRAY_SIZE(power_devs),
	&power_supply_resources[0], 0);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add power supply "
	"subdev\n");
	goto out_dev;
	}
	}

	if (pdata && pdata->touch) {
	ret = mfd_add_devices(chip->dev, 0, &touch_devs[0],
	ARRAY_SIZE(touch_devs),
	&touch_resources[0], 0);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add touch subdev\n");
	goto out_dev;
	}
	}

	return 0;
	out_dev:
	mfd_remove_devices(chip->dev);
	out:
	return ret;
	}

	void __devexit max8925_device_exit(struct max8925_chip *chip)
	{
	if (chip->core_irq)
	free_irq(chip->core_irq, chip);
	if (chip->tsc_irq)
	free_irq(chip->tsc_irq, chip);
	mfd_remove_devices(chip->dev);
	}


	MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
	MODULE_LICENSE("GPL");