drivers/mfd/ab8500-core.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (C) ST-Ericsson SA 2010
  *
  * License Terms: GNU General Public License v2
  * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
  * Author: Rabin Vincent <rabin.vincent@stericsson.com>
  * Changes: Mattias Wallin <mattias.wallin@stericsson.com>
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/abx500.h>
 #include <linux/mfd/ab8500.h>
 #include <linux/regulator/ab8500.h>

 /*
  * Interrupt register offsets
  * Bank : 0x0E
  */
 #define AB8500_IT_SOURCE1_REG		0x00
 #define AB8500_IT_SOURCE2_REG		0x01
 #define AB8500_IT_SOURCE3_REG		0x02
 #define AB8500_IT_SOURCE4_REG		0x03
 #define AB8500_IT_SOURCE5_REG		0x04
 #define AB8500_IT_SOURCE6_REG		0x05
 #define AB8500_IT_SOURCE7_REG		0x06
 #define AB8500_IT_SOURCE8_REG		0x07
 #define AB8500_IT_SOURCE19_REG		0x12
 #define AB8500_IT_SOURCE20_REG		0x13
 #define AB8500_IT_SOURCE21_REG		0x14
 #define AB8500_IT_SOURCE22_REG		0x15
 #define AB8500_IT_SOURCE23_REG		0x16
 #define AB8500_IT_SOURCE24_REG		0x17

 /*
  * latch registers
  */
 #define AB8500_IT_LATCH1_REG		0x20
 #define AB8500_IT_LATCH2_REG		0x21
 #define AB8500_IT_LATCH3_REG		0x22
 #define AB8500_IT_LATCH4_REG		0x23
 #define AB8500_IT_LATCH5_REG		0x24
 #define AB8500_IT_LATCH6_REG		0x25
 #define AB8500_IT_LATCH7_REG		0x26
 #define AB8500_IT_LATCH8_REG		0x27
 #define AB8500_IT_LATCH9_REG		0x28
 #define AB8500_IT_LATCH10_REG		0x29
 #define AB8500_IT_LATCH19_REG		0x32
 #define AB8500_IT_LATCH20_REG		0x33
 #define AB8500_IT_LATCH21_REG		0x34
 #define AB8500_IT_LATCH22_REG		0x35
 #define AB8500_IT_LATCH23_REG		0x36
 #define AB8500_IT_LATCH24_REG		0x37

 /*
  * mask registers
  */

 #define AB8500_IT_MASK1_REG		0x40
 #define AB8500_IT_MASK2_REG		0x41
 #define AB8500_IT_MASK3_REG		0x42
 #define AB8500_IT_MASK4_REG		0x43
 #define AB8500_IT_MASK5_REG		0x44
 #define AB8500_IT_MASK6_REG		0x45
 #define AB8500_IT_MASK7_REG		0x46
 #define AB8500_IT_MASK8_REG		0x47
 #define AB8500_IT_MASK9_REG		0x48
 #define AB8500_IT_MASK10_REG		0x49
 #define AB8500_IT_MASK11_REG		0x4A
 #define AB8500_IT_MASK12_REG		0x4B
 #define AB8500_IT_MASK13_REG		0x4C
 #define AB8500_IT_MASK14_REG		0x4D
 #define AB8500_IT_MASK15_REG		0x4E
 #define AB8500_IT_MASK16_REG		0x4F
 #define AB8500_IT_MASK17_REG		0x50
 #define AB8500_IT_MASK18_REG		0x51
 #define AB8500_IT_MASK19_REG		0x52
 #define AB8500_IT_MASK20_REG		0x53
 #define AB8500_IT_MASK21_REG		0x54
 #define AB8500_IT_MASK22_REG		0x55
 #define AB8500_IT_MASK23_REG		0x56
 #define AB8500_IT_MASK24_REG		0x57

 #define AB8500_REV_REG			0x80

 /*
  * Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
  * numbers are indexed into this array with (num / 8).
  *
  * This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
  * offset 0.
  */
 static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
 	0, 1, 2, 3, 4, 6, 7, 8, 9, 18, 19, 20, 21,
 };

 static int ab8500_get_chip_id(struct device *dev)
 {
 	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
 	return (int)ab8500->chip_id;
 }

 static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
 	u8 reg, u8 data)
 {
 	int ret;
 	/*
 	 * Put the u8 bank and u8 register together into a an u16.
 	 * The bank on higher 8 bits and register in lower 8 bits.
 	 * */
 	u16 addr = ((u16)bank) << 8 | reg;

 	dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);

 	ret = mutex_lock_interruptible(&ab8500->lock);
 	if (ret)
 		return ret;

 	ret = ab8500->write(ab8500, addr, data);
 	if (ret < 0)
 		dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
 			addr, ret);
 	mutex_unlock(&ab8500->lock);

 	return ret;
 }

 static int ab8500_set_register(struct device *dev, u8 bank,
 	u8 reg, u8 value)
 {
 	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);

 	return set_register_interruptible(ab8500, bank, reg, value);
 }

 static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
 	u8 reg, u8 *value)
 {
 	int ret;
 	/* put the u8 bank and u8 reg together into a an u16.
 	 * bank on higher 8 bits and reg in lower */
 	u16 addr = ((u16)bank) << 8 | reg;

 	ret = mutex_lock_interruptible(&ab8500->lock);
 	if (ret)
 		return ret;

 	ret = ab8500->read(ab8500, addr);
 	if (ret < 0)
 		dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
 			addr, ret);
 	else
 		*value = ret;

 	mutex_unlock(&ab8500->lock);
 	dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);

 	return ret;
 }

 static int ab8500_get_register(struct device *dev, u8 bank,
 	u8 reg, u8 *value)
 {
 	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);

 	return get_register_interruptible(ab8500, bank, reg, value);
 }

 static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
 	u8 reg, u8 bitmask, u8 bitvalues)
 {
 	int ret;
 	u8 data;
 	/* put the u8 bank and u8 reg together into a an u16.
 	 * bank on higher 8 bits and reg in lower */
 	u16 addr = ((u16)bank) << 8 | reg;

 	ret = mutex_lock_interruptible(&ab8500->lock);
 	if (ret)
 		return ret;

 	ret = ab8500->read(ab8500, addr);
 	if (ret < 0) {
 		dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
 			addr, ret);
 		goto out;
 	}

 	data = (u8)ret;
 	data = (~bitmask & data) | (bitmask & bitvalues);

 	ret = ab8500->write(ab8500, addr, data);
 	if (ret < 0)
 		dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
 			addr, ret);

 	dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
 out:
 	mutex_unlock(&ab8500->lock);
 	return ret;
 }

 static int ab8500_mask_and_set_register(struct device *dev,
 	u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
 {
 	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);

 	return mask_and_set_register_interruptible(ab8500, bank, reg,
 		bitmask, bitvalues);

 }

 static struct abx500_ops ab8500_ops = {
 	.get_chip_id = ab8500_get_chip_id,
 	.get_register = ab8500_get_register,
 	.set_register = ab8500_set_register,
 	.get_register_page = NULL,
 	.set_register_page = NULL,
 	.mask_and_set_register = ab8500_mask_and_set_register,
 	.event_registers_startup_state_get = NULL,
 	.startup_irq_enabled = NULL,
 };

 static void ab8500_irq_lock(unsigned int irq)
 {
 	struct ab8500 *ab8500 = get_irq_chip_data(irq);

 	mutex_lock(&ab8500->irq_lock);
 }

 static void ab8500_irq_sync_unlock(unsigned int irq)
 {
 	struct ab8500 *ab8500 = get_irq_chip_data(irq);
 	int i;

 	for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
 		u8 old = ab8500->oldmask[i];
 		u8 new = ab8500->mask[i];
 		int reg;

 		if (new == old)
 			continue;

 		ab8500->oldmask[i] = new;

 		reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
 		set_register_interruptible(ab8500, AB8500_INTERRUPT, reg, new);
 	}

 	mutex_unlock(&ab8500->irq_lock);
 }

 static void ab8500_irq_mask(unsigned int irq)
 {
 	struct ab8500 *ab8500 = get_irq_chip_data(irq);
 	int offset = irq - ab8500->irq_base;
 	int index = offset / 8;
 	int mask = 1 << (offset % 8);

 	ab8500->mask[index] |= mask;
 }

 static void ab8500_irq_unmask(unsigned int irq)
 {
 	struct ab8500 *ab8500 = get_irq_chip_data(irq);
 	int offset = irq - ab8500->irq_base;
 	int index = offset / 8;
 	int mask = 1 << (offset % 8);

 	ab8500->mask[index] &= ~mask;
 }

 static struct irq_chip ab8500_irq_chip = {
 	.name			= "ab8500",
 	.bus_lock		= ab8500_irq_lock,
 	.bus_sync_unlock	= ab8500_irq_sync_unlock,
 	.mask			= ab8500_irq_mask,
 	.unmask			= ab8500_irq_unmask,
 };

 static irqreturn_t ab8500_irq(int irq, void *dev)
 {
 	struct ab8500 *ab8500 = dev;
 	int i;

 	dev_vdbg(ab8500->dev, "interrupt\n");

 	for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
 		int regoffset = ab8500_irq_regoffset[i];
 		int status;
 		u8 value;

 		status = get_register_interruptible(ab8500, AB8500_INTERRUPT,
 			AB8500_IT_LATCH1_REG + regoffset, &value);
 		if (status < 0 || value == 0)
 			continue;

 		do {
 			int bit = __ffs(value);
 			int line = i * 8 + bit;

 			handle_nested_irq(ab8500->irq_base + line);
 			value &= ~(1 << bit);
 		} while (value);
 	}

 	return IRQ_HANDLED;
 }

 static int ab8500_irq_init(struct ab8500 *ab8500)
 {
 	int base = ab8500->irq_base;
 	int irq;

 	for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
 		set_irq_chip_data(irq, ab8500);
 		set_irq_chip_and_handler(irq, &ab8500_irq_chip,
 					 handle_simple_irq);
 		set_irq_nested_thread(irq, 1);
 #ifdef CONFIG_ARM
 		set_irq_flags(irq, IRQF_VALID);
 #else
 		set_irq_noprobe(irq);
 #endif
 	}

 	return 0;
 }

 static void ab8500_irq_remove(struct ab8500 *ab8500)
 {
 	int base = ab8500->irq_base;
 	int irq;

 	for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
 #ifdef CONFIG_ARM
 		set_irq_flags(irq, 0);
 #endif
 		set_irq_chip_and_handler(irq, NULL, NULL);
 		set_irq_chip_data(irq, NULL);
 	}
 }

 static struct resource ab8500_gpadc_resources[] = {
 	{
 		.name	= "HW_CONV_END",
 		.start	= AB8500_INT_GP_HW_ADC_CONV_END,
 		.end	= AB8500_INT_GP_HW_ADC_CONV_END,
 		.flags	= IORESOURCE_IRQ,
 	},
 	{
 		.name	= "SW_CONV_END",
 		.start	= AB8500_INT_GP_SW_ADC_CONV_END,
 		.end	= AB8500_INT_GP_SW_ADC_CONV_END,
 		.flags	= IORESOURCE_IRQ,
 	},
 };

 static struct resource ab8500_rtc_resources[] = {
 	{
 		.name	= "60S",
 		.start	= AB8500_INT_RTC_60S,
 		.end	= AB8500_INT_RTC_60S,
 		.flags	= IORESOURCE_IRQ,
 	},
 	{
 		.name	= "ALARM",
 		.start	= AB8500_INT_RTC_ALARM,
 		.end	= AB8500_INT_RTC_ALARM,
 		.flags	= IORESOURCE_IRQ,
 	},
 };

 static struct resource ab8500_poweronkey_db_resources[] = {
 	{
 		.name	= "ONKEY_DBF",
 		.start	= AB8500_INT_PON_KEY1DB_F,
 		.end	= AB8500_INT_PON_KEY1DB_F,
 		.flags	= IORESOURCE_IRQ,
 	},
 	{
 		.name	= "ONKEY_DBR",
 		.start	= AB8500_INT_PON_KEY1DB_R,
 		.end	= AB8500_INT_PON_KEY1DB_R,
 		.flags	= IORESOURCE_IRQ,
 	},
 };

 static struct mfd_cell ab8500_devs[] = {
 #ifdef CONFIG_DEBUG_FS
 	{
 		.name = "ab8500-debug",
 	},
 #endif
 	{
 		.name = "ab8500-gpadc",
 		.num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
 		.resources = ab8500_gpadc_resources,
 	},
 	{
 		.name = "ab8500-rtc",
 		.num_resources = ARRAY_SIZE(ab8500_rtc_resources),
 		.resources = ab8500_rtc_resources,
 	},
 	{
 		.name = "ab8500-pwm",
 		.id = 1,
 	},
 	{
 		.name = "ab8500-pwm",
 		.id = 2,
 	},
 	{
 		.name = "ab8500-pwm",
 		.id = 3,
 	},
 	{ .name = "ab8500-charger", },
 	{ .name = "ab8500-audio", },
 	{ .name = "ab8500-usb", },
 	{ .name = "ab8500-regulator", },
 	{
 		.name = "ab8500-poweron-key",
 		.num_resources = ARRAY_SIZE(ab8500_poweronkey_db_resources),
 		.resources = ab8500_poweronkey_db_resources,
 	},
 };

 int __devinit ab8500_init(struct ab8500 *ab8500)
 {
 	struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
 	int ret;
 	int i;
 	u8 value;

 	if (plat)
 		ab8500->irq_base = plat->irq_base;

 	mutex_init(&ab8500->lock);
 	mutex_init(&ab8500->irq_lock);

 	ret = get_register_interruptible(ab8500, AB8500_MISC,
 		AB8500_REV_REG, &value);
 	if (ret < 0)
 		return ret;

 	/*
 	 * 0x0 - Early Drop
 	 * 0x10 - Cut 1.0
 	 * 0x11 - Cut 1.1
 	 */
 	if (value == 0x0 || value == 0x10 || value == 0x11) {
 		ab8500->revision = value;
 		dev_info(ab8500->dev, "detected chip, revision: %#x\n", value);
 	} else {
 		dev_err(ab8500->dev, "unknown chip, revision: %#x\n", value);
 		return -EINVAL;
 	}
 	ab8500->chip_id = value;

 	if (plat && plat->init)
 		plat->init(ab8500);

 	/* Clear and mask all interrupts */
 	for (i = 0; i < 10; i++) {
 		get_register_interruptible(ab8500, AB8500_INTERRUPT,
 			AB8500_IT_LATCH1_REG + i, &value);
 		set_register_interruptible(ab8500, AB8500_INTERRUPT,
 			AB8500_IT_MASK1_REG + i, 0xff);
 	}

 	for (i = 18; i < 24; i++) {
 		get_register_interruptible(ab8500, AB8500_INTERRUPT,
 			AB8500_IT_LATCH1_REG + i, &value);
 		set_register_interruptible(ab8500, AB8500_INTERRUPT,
 			AB8500_IT_MASK1_REG + i, 0xff);
 	}

 	ret = abx500_register_ops(ab8500->dev, &ab8500_ops);
 	if (ret)
 		return ret;

 	for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
 		ab8500->mask[i] = ab8500->oldmask[i] = 0xff;

 	if (ab8500->irq_base) {
 		ret = ab8500_irq_init(ab8500);
 		if (ret)
 			return ret;

 		ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
 					   IRQF_ONESHOT, "ab8500", ab8500);
 		if (ret)
 			goto out_removeirq;
 	}

 	ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
 			      ARRAY_SIZE(ab8500_devs), NULL,
 			      ab8500->irq_base);
 	if (ret)
 		goto out_freeirq;

 	return ret;

 out_freeirq:
 	if (ab8500->irq_base) {
 		free_irq(ab8500->irq, ab8500);
 out_removeirq:
 		ab8500_irq_remove(ab8500);
 	}
 	return ret;
 }

 int __devexit ab8500_exit(struct ab8500 *ab8500)
 {
 	mfd_remove_devices(ab8500->dev);
 	if (ab8500->irq_base) {
 		free_irq(ab8500->irq, ab8500);
 		ab8500_irq_remove(ab8500);
 	}

 	return 0;
 }

 MODULE_AUTHOR("Srinidhi Kasagar, Rabin Vincent");
 MODULE_DESCRIPTION("AB8500 MFD core");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) ST-Ericsson SA 2010
	*
	* License Terms: GNU General Public License v2
	* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
	* Author: Rabin Vincent <rabin.vincent@stericsson.com>
	* Changes: Mattias Wallin <mattias.wallin@stericsson.com>
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/irq.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/abx500.h>
	#include <linux/mfd/ab8500.h>
	#include <linux/regulator/ab8500.h>

	/*
	* Interrupt register offsets
	* Bank : 0x0E
	*/
	#define AB8500_IT_SOURCE1_REG 0x00
	#define AB8500_IT_SOURCE2_REG 0x01
	#define AB8500_IT_SOURCE3_REG 0x02
	#define AB8500_IT_SOURCE4_REG 0x03
	#define AB8500_IT_SOURCE5_REG 0x04
	#define AB8500_IT_SOURCE6_REG 0x05
	#define AB8500_IT_SOURCE7_REG 0x06
	#define AB8500_IT_SOURCE8_REG 0x07
	#define AB8500_IT_SOURCE19_REG 0x12
	#define AB8500_IT_SOURCE20_REG 0x13
	#define AB8500_IT_SOURCE21_REG 0x14
	#define AB8500_IT_SOURCE22_REG 0x15
	#define AB8500_IT_SOURCE23_REG 0x16
	#define AB8500_IT_SOURCE24_REG 0x17

	/*
	* latch registers
	*/
	#define AB8500_IT_LATCH1_REG 0x20
	#define AB8500_IT_LATCH2_REG 0x21
	#define AB8500_IT_LATCH3_REG 0x22
	#define AB8500_IT_LATCH4_REG 0x23
	#define AB8500_IT_LATCH5_REG 0x24
	#define AB8500_IT_LATCH6_REG 0x25
	#define AB8500_IT_LATCH7_REG 0x26
	#define AB8500_IT_LATCH8_REG 0x27
	#define AB8500_IT_LATCH9_REG 0x28
	#define AB8500_IT_LATCH10_REG 0x29
	#define AB8500_IT_LATCH19_REG 0x32
	#define AB8500_IT_LATCH20_REG 0x33
	#define AB8500_IT_LATCH21_REG 0x34
	#define AB8500_IT_LATCH22_REG 0x35
	#define AB8500_IT_LATCH23_REG 0x36
	#define AB8500_IT_LATCH24_REG 0x37

	/*
	* mask registers
	*/

	#define AB8500_IT_MASK1_REG 0x40
	#define AB8500_IT_MASK2_REG 0x41
	#define AB8500_IT_MASK3_REG 0x42
	#define AB8500_IT_MASK4_REG 0x43
	#define AB8500_IT_MASK5_REG 0x44
	#define AB8500_IT_MASK6_REG 0x45
	#define AB8500_IT_MASK7_REG 0x46
	#define AB8500_IT_MASK8_REG 0x47
	#define AB8500_IT_MASK9_REG 0x48
	#define AB8500_IT_MASK10_REG 0x49
	#define AB8500_IT_MASK11_REG 0x4A
	#define AB8500_IT_MASK12_REG 0x4B
	#define AB8500_IT_MASK13_REG 0x4C
	#define AB8500_IT_MASK14_REG 0x4D
	#define AB8500_IT_MASK15_REG 0x4E
	#define AB8500_IT_MASK16_REG 0x4F
	#define AB8500_IT_MASK17_REG 0x50
	#define AB8500_IT_MASK18_REG 0x51
	#define AB8500_IT_MASK19_REG 0x52
	#define AB8500_IT_MASK20_REG 0x53
	#define AB8500_IT_MASK21_REG 0x54
	#define AB8500_IT_MASK22_REG 0x55
	#define AB8500_IT_MASK23_REG 0x56
	#define AB8500_IT_MASK24_REG 0x57

	#define AB8500_REV_REG 0x80

	/*
	* Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
	* numbers are indexed into this array with (num / 8).
	*
	* This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
	* offset 0.
	*/
	static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
	0, 1, 2, 3, 4, 6, 7, 8, 9, 18, 19, 20, 21,
	};

	static int ab8500_get_chip_id(struct device *dev)
	{
	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
	return (int)ab8500->chip_id;
	}

	static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
	u8 reg, u8 data)
	{
	int ret;
	/*
	* Put the u8 bank and u8 register together into a an u16.
	* The bank on higher 8 bits and register in lower 8 bits.
	* */
	u16 addr = ((u16)bank) << 8 \| reg;

	dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);

	ret = mutex_lock_interruptible(&ab8500->lock);
	if (ret)
	return ret;

	ret = ab8500->write(ab8500, addr, data);
	if (ret < 0)
	dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
	addr, ret);
	mutex_unlock(&ab8500->lock);

	return ret;
	}

	static int ab8500_set_register(struct device *dev, u8 bank,
	u8 reg, u8 value)
	{
	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);

	return set_register_interruptible(ab8500, bank, reg, value);
	}

	static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
	u8 reg, u8 *value)
	{
	int ret;
	/* put the u8 bank and u8 reg together into a an u16.
	* bank on higher 8 bits and reg in lower */
	u16 addr = ((u16)bank) << 8 \| reg;

	ret = mutex_lock_interruptible(&ab8500->lock);
	if (ret)
	return ret;

	ret = ab8500->read(ab8500, addr);
	if (ret < 0)
	dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
	addr, ret);
	else
	*value = ret;

	mutex_unlock(&ab8500->lock);
	dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);

	return ret;
	}

	static int ab8500_get_register(struct device *dev, u8 bank,
	u8 reg, u8 *value)
	{
	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);

	return get_register_interruptible(ab8500, bank, reg, value);
	}

	static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
	u8 reg, u8 bitmask, u8 bitvalues)
	{
	int ret;
	u8 data;
	/* put the u8 bank and u8 reg together into a an u16.
	* bank on higher 8 bits and reg in lower */
	u16 addr = ((u16)bank) << 8 \| reg;

	ret = mutex_lock_interruptible(&ab8500->lock);
	if (ret)
	return ret;

	ret = ab8500->read(ab8500, addr);
	if (ret < 0) {
	dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
	addr, ret);
	goto out;
	}

	data = (u8)ret;
	data = (~bitmask & data) \| (bitmask & bitvalues);

	ret = ab8500->write(ab8500, addr, data);
	if (ret < 0)
	dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
	addr, ret);

	dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
	out:
	mutex_unlock(&ab8500->lock);
	return ret;
	}

	static int ab8500_mask_and_set_register(struct device *dev,
	u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
	{
	struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);

	return mask_and_set_register_interruptible(ab8500, bank, reg,
	bitmask, bitvalues);

	}

	static struct abx500_ops ab8500_ops = {
	.get_chip_id = ab8500_get_chip_id,
	.get_register = ab8500_get_register,
	.set_register = ab8500_set_register,
	.get_register_page = NULL,
	.set_register_page = NULL,
	.mask_and_set_register = ab8500_mask_and_set_register,
	.event_registers_startup_state_get = NULL,
	.startup_irq_enabled = NULL,
	};

	static void ab8500_irq_lock(unsigned int irq)
	{
	struct ab8500 *ab8500 = get_irq_chip_data(irq);

	mutex_lock(&ab8500->irq_lock);
	}

	static void ab8500_irq_sync_unlock(unsigned int irq)
	{
	struct ab8500 *ab8500 = get_irq_chip_data(irq);
	int i;

	for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
	u8 old = ab8500->oldmask[i];
	u8 new = ab8500->mask[i];
	int reg;

	if (new == old)
	continue;

	ab8500->oldmask[i] = new;

	reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
	set_register_interruptible(ab8500, AB8500_INTERRUPT, reg, new);
	}

	mutex_unlock(&ab8500->irq_lock);
	}

	static void ab8500_irq_mask(unsigned int irq)
	{
	struct ab8500 *ab8500 = get_irq_chip_data(irq);
	int offset = irq - ab8500->irq_base;
	int index = offset / 8;
	int mask = 1 << (offset % 8);

	ab8500->mask[index] \|= mask;
	}

	static void ab8500_irq_unmask(unsigned int irq)
	{
	struct ab8500 *ab8500 = get_irq_chip_data(irq);
	int offset = irq - ab8500->irq_base;
	int index = offset / 8;
	int mask = 1 << (offset % 8);

	ab8500->mask[index] &= ~mask;
	}

	static struct irq_chip ab8500_irq_chip = {
	.name = "ab8500",
	.bus_lock = ab8500_irq_lock,
	.bus_sync_unlock = ab8500_irq_sync_unlock,
	.mask = ab8500_irq_mask,
	.unmask = ab8500_irq_unmask,
	};

	static irqreturn_t ab8500_irq(int irq, void *dev)
	{
	struct ab8500 *ab8500 = dev;
	int i;

	dev_vdbg(ab8500->dev, "interrupt\n");

	for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
	int regoffset = ab8500_irq_regoffset[i];
	int status;
	u8 value;

	status = get_register_interruptible(ab8500, AB8500_INTERRUPT,
	AB8500_IT_LATCH1_REG + regoffset, &value);
	if (status < 0 \|\| value == 0)
	continue;

	do {
	int bit = __ffs(value);
	int line = i * 8 + bit;

	handle_nested_irq(ab8500->irq_base + line);
	value &= ~(1 << bit);
	} while (value);
	}

	return IRQ_HANDLED;
	}

	static int ab8500_irq_init(struct ab8500 *ab8500)
	{
	int base = ab8500->irq_base;
	int irq;

	for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
	set_irq_chip_data(irq, ab8500);
	set_irq_chip_and_handler(irq, &ab8500_irq_chip,
	handle_simple_irq);
	set_irq_nested_thread(irq, 1);
	#ifdef CONFIG_ARM
	set_irq_flags(irq, IRQF_VALID);
	#else
	set_irq_noprobe(irq);
	#endif
	}

	return 0;
	}

	static void ab8500_irq_remove(struct ab8500 *ab8500)
	{
	int base = ab8500->irq_base;
	int irq;

	for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
	#ifdef CONFIG_ARM
	set_irq_flags(irq, 0);
	#endif
	set_irq_chip_and_handler(irq, NULL, NULL);
	set_irq_chip_data(irq, NULL);
	}
	}

	static struct resource ab8500_gpadc_resources[] = {
	{
	.name = "HW_CONV_END",
	.start = AB8500_INT_GP_HW_ADC_CONV_END,
	.end = AB8500_INT_GP_HW_ADC_CONV_END,
	.flags = IORESOURCE_IRQ,
	},
	{
	.name = "SW_CONV_END",
	.start = AB8500_INT_GP_SW_ADC_CONV_END,
	.end = AB8500_INT_GP_SW_ADC_CONV_END,
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct resource ab8500_rtc_resources[] = {
	{
	.name = "60S",
	.start = AB8500_INT_RTC_60S,
	.end = AB8500_INT_RTC_60S,
	.flags = IORESOURCE_IRQ,
	},
	{
	.name = "ALARM",
	.start = AB8500_INT_RTC_ALARM,
	.end = AB8500_INT_RTC_ALARM,
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct resource ab8500_poweronkey_db_resources[] = {
	{
	.name = "ONKEY_DBF",
	.start = AB8500_INT_PON_KEY1DB_F,
	.end = AB8500_INT_PON_KEY1DB_F,
	.flags = IORESOURCE_IRQ,
	},
	{
	.name = "ONKEY_DBR",
	.start = AB8500_INT_PON_KEY1DB_R,
	.end = AB8500_INT_PON_KEY1DB_R,
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct mfd_cell ab8500_devs[] = {
	#ifdef CONFIG_DEBUG_FS
	{
	.name = "ab8500-debug",
	},
	#endif
	{
	.name = "ab8500-gpadc",
	.num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
	.resources = ab8500_gpadc_resources,
	},
	{
	.name = "ab8500-rtc",
	.num_resources = ARRAY_SIZE(ab8500_rtc_resources),
	.resources = ab8500_rtc_resources,
	},
	{
	.name = "ab8500-pwm",
	.id = 1,
	},
	{
	.name = "ab8500-pwm",
	.id = 2,
	},
	{
	.name = "ab8500-pwm",
	.id = 3,
	},
	{ .name = "ab8500-charger", },
	{ .name = "ab8500-audio", },
	{ .name = "ab8500-usb", },
	{ .name = "ab8500-regulator", },
	{
	.name = "ab8500-poweron-key",
	.num_resources = ARRAY_SIZE(ab8500_poweronkey_db_resources),
	.resources = ab8500_poweronkey_db_resources,
	},
	};

	int __devinit ab8500_init(struct ab8500 *ab8500)
	{
	struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
	int ret;
	int i;
	u8 value;

	if (plat)
	ab8500->irq_base = plat->irq_base;

	mutex_init(&ab8500->lock);
	mutex_init(&ab8500->irq_lock);

	ret = get_register_interruptible(ab8500, AB8500_MISC,
	AB8500_REV_REG, &value);
	if (ret < 0)
	return ret;

	/*
	* 0x0 - Early Drop
	* 0x10 - Cut 1.0
	* 0x11 - Cut 1.1
	*/
	if (value == 0x0 \|\| value == 0x10 \|\| value == 0x11) {
	ab8500->revision = value;
	dev_info(ab8500->dev, "detected chip, revision: %#x\n", value);
	} else {
	dev_err(ab8500->dev, "unknown chip, revision: %#x\n", value);
	return -EINVAL;
	}
	ab8500->chip_id = value;

	if (plat && plat->init)
	plat->init(ab8500);

	/* Clear and mask all interrupts */
	for (i = 0; i < 10; i++) {
	get_register_interruptible(ab8500, AB8500_INTERRUPT,
	AB8500_IT_LATCH1_REG + i, &value);
	set_register_interruptible(ab8500, AB8500_INTERRUPT,
	AB8500_IT_MASK1_REG + i, 0xff);
	}

	for (i = 18; i < 24; i++) {
	get_register_interruptible(ab8500, AB8500_INTERRUPT,
	AB8500_IT_LATCH1_REG + i, &value);
	set_register_interruptible(ab8500, AB8500_INTERRUPT,
	AB8500_IT_MASK1_REG + i, 0xff);
	}

	ret = abx500_register_ops(ab8500->dev, &ab8500_ops);
	if (ret)
	return ret;

	for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
	ab8500->mask[i] = ab8500->oldmask[i] = 0xff;

	if (ab8500->irq_base) {
	ret = ab8500_irq_init(ab8500);
	if (ret)
	return ret;

	ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
	IRQF_ONESHOT, "ab8500", ab8500);
	if (ret)
	goto out_removeirq;
	}

	ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
	ARRAY_SIZE(ab8500_devs), NULL,
	ab8500->irq_base);
	if (ret)
	goto out_freeirq;

	return ret;

	out_freeirq:
	if (ab8500->irq_base) {
	free_irq(ab8500->irq, ab8500);
	out_removeirq:
	ab8500_irq_remove(ab8500);
	}
	return ret;
	}

	int __devexit ab8500_exit(struct ab8500 *ab8500)
	{
	mfd_remove_devices(ab8500->dev);
	if (ab8500->irq_base) {
	free_irq(ab8500->irq, ab8500);
	ab8500_irq_remove(ab8500);
	}

	return 0;
	}

	MODULE_AUTHOR("Srinidhi Kasagar, Rabin Vincent");
	MODULE_DESCRIPTION("AB8500 MFD core");
	MODULE_LICENSE("GPL v2");