drivers/mfd/tps6586x.c - kernel/msm-4.9 - Gitiles

 /*
  * Core driver for TI TPS6586x PMIC family
  *
  * Copyright (c) 2010 CompuLab Ltd.
  * Mike Rapoport <mike@compulab.co.il>
  *
  * Based on da903x.c.
  * Copyright (C) 2008 Compulab, Ltd.
  * Mike Rapoport <mike@compulab.co.il>
  * Copyright (C) 2006-2008 Marvell International Ltd.
  * Eric Miao <eric.miao@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/interrupt.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/i2c.h>

 #include <linux/mfd/core.h>
 #include <linux/mfd/tps6586x.h>

 /* GPIO control registers */
 #define TPS6586X_GPIOSET1	0x5d
 #define TPS6586X_GPIOSET2	0x5e

 /* interrupt control registers */
 #define TPS6586X_INT_ACK1	0xb5
 #define TPS6586X_INT_ACK2	0xb6
 #define TPS6586X_INT_ACK3	0xb7
 #define TPS6586X_INT_ACK4	0xb8

 /* interrupt mask registers */
 #define TPS6586X_INT_MASK1	0xb0
 #define TPS6586X_INT_MASK2	0xb1
 #define TPS6586X_INT_MASK3	0xb2
 #define TPS6586X_INT_MASK4	0xb3
 #define TPS6586X_INT_MASK5	0xb4

 /* device id */
 #define TPS6586X_VERSIONCRC	0xcd

 struct tps6586x_irq_data {
 	u8	mask_reg;
 	u8	mask_mask;
 };

 #define TPS6586X_IRQ(_reg, _mask)				\
 	{							\
 		.mask_reg = (_reg) - TPS6586X_INT_MASK1,	\
 		.mask_mask = (_mask),				\
 	}

 static const struct tps6586x_irq_data tps6586x_irqs[] = {
 	[TPS6586X_INT_PLDO_0]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
 	[TPS6586X_INT_PLDO_1]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
 	[TPS6586X_INT_PLDO_2]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
 	[TPS6586X_INT_PLDO_3]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
 	[TPS6586X_INT_PLDO_4]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
 	[TPS6586X_INT_PLDO_5]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
 	[TPS6586X_INT_PLDO_6]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
 	[TPS6586X_INT_PLDO_7]	= TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
 	[TPS6586X_INT_COMP_DET]	= TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
 	[TPS6586X_INT_ADC]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
 	[TPS6586X_INT_PLDO_8]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
 	[TPS6586X_INT_PLDO_9]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
 	[TPS6586X_INT_PSM_0]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
 	[TPS6586X_INT_PSM_1]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
 	[TPS6586X_INT_PSM_2]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
 	[TPS6586X_INT_PSM_3]	= TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
 	[TPS6586X_INT_RTC_ALM1]	= TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
 	[TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
 	[TPS6586X_INT_USB_DET]	= TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
 	[TPS6586X_INT_AC_DET]	= TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
 	[TPS6586X_INT_BAT_DET]	= TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
 	[TPS6586X_INT_CHG_STAT]	= TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
 	[TPS6586X_INT_CHG_TEMP]	= TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
 	[TPS6586X_INT_PP]	= TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
 	[TPS6586X_INT_RESUME]	= TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
 	[TPS6586X_INT_LOW_SYS]	= TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
 	[TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
 };

 struct tps6586x {
 	struct mutex		lock;
 	struct device		*dev;
 	struct i2c_client	*client;

 	struct gpio_chip	gpio;
 	struct irq_chip		irq_chip;
 	struct mutex		irq_lock;
 	int			irq_base;
 	u32			irq_en;
 	u8			mask_cache[5];
 	u8			mask_reg[5];
 };

 static inline int __tps6586x_read(struct i2c_client *client,
 				  int reg, uint8_t *val)
 {
 	int ret;

 	ret = i2c_smbus_read_byte_data(client, reg);
 	if (ret < 0) {
 		dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
 		return ret;
 	}

 	*val = (uint8_t)ret;

 	return 0;
 }

 static inline int __tps6586x_reads(struct i2c_client *client, int reg,
 				   int len, uint8_t *val)
 {
 	int ret;

 	ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
 	if (ret < 0) {
 		dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
 		return ret;
 	}

 	return 0;
 }

 static inline int __tps6586x_write(struct i2c_client *client,
 				 int reg, uint8_t val)
 {
 	int ret;

 	ret = i2c_smbus_write_byte_data(client, reg, val);
 	if (ret < 0) {
 		dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
 				val, reg);
 		return ret;
 	}

 	return 0;
 }

 static inline int __tps6586x_writes(struct i2c_client *client, int reg,
 				  int len, uint8_t *val)
 {
 	int ret, i;

 	for (i = 0; i < len; i++) {
 		ret = __tps6586x_write(client, reg + i, *(val + i));
 		if (ret < 0)
 			return ret;
 	}

 	return 0;
 }

 int tps6586x_write(struct device *dev, int reg, uint8_t val)
 {
 	return __tps6586x_write(to_i2c_client(dev), reg, val);
 }
 EXPORT_SYMBOL_GPL(tps6586x_write);

 int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
 {
 	return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
 }
 EXPORT_SYMBOL_GPL(tps6586x_writes);

 int tps6586x_read(struct device *dev, int reg, uint8_t *val)
 {
 	return __tps6586x_read(to_i2c_client(dev), reg, val);
 }
 EXPORT_SYMBOL_GPL(tps6586x_read);

 int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
 {
 	return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
 }
 EXPORT_SYMBOL_GPL(tps6586x_reads);

 int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 {
 	struct tps6586x *tps6586x = dev_get_drvdata(dev);
 	uint8_t reg_val;
 	int ret = 0;

 	mutex_lock(&tps6586x->lock);

 	ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
 	if (ret)
 		goto out;

 	if ((reg_val & bit_mask) == 0) {
 		reg_val |= bit_mask;
 		ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
 	}
 out:
 	mutex_unlock(&tps6586x->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(tps6586x_set_bits);

 int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 {
 	struct tps6586x *tps6586x = dev_get_drvdata(dev);
 	uint8_t reg_val;
 	int ret = 0;

 	mutex_lock(&tps6586x->lock);

 	ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
 	if (ret)
 		goto out;

 	if (reg_val & bit_mask) {
 		reg_val &= ~bit_mask;
 		ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
 	}
 out:
 	mutex_unlock(&tps6586x->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(tps6586x_clr_bits);

 int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
 {
 	struct tps6586x *tps6586x = dev_get_drvdata(dev);
 	uint8_t reg_val;
 	int ret = 0;

 	mutex_lock(&tps6586x->lock);

 	ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
 	if (ret)
 		goto out;

 	if ((reg_val & mask) != val) {
 		reg_val = (reg_val & ~mask) | val;
 		ret = __tps6586x_write(tps6586x->client, reg, reg_val);
 	}
 out:
 	mutex_unlock(&tps6586x->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(tps6586x_update);

 static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
 {
 	struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
 	uint8_t val;
 	int ret;

 	ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
 	if (ret)
 		return ret;

 	return !!(val & (1 << offset));
 }


 static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
 			      int value)
 {
 	struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);

 	__tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,
 			 value << offset);
 }

 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
 				int value)
 {
 	struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
 	uint8_t val, mask;

 	tps6586x_gpio_set(gc, offset, value);

 	val = 0x1 << (offset * 2);
 	mask = 0x3 << (offset * 2);

 	return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
 }

 static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
 {
 	int ret;

 	if (!gpio_base)
 		return;

 	tps6586x->gpio.owner		= THIS_MODULE;
 	tps6586x->gpio.label		= tps6586x->client->name;
 	tps6586x->gpio.dev		= tps6586x->dev;
 	tps6586x->gpio.base		= gpio_base;
 	tps6586x->gpio.ngpio		= 4;
 	tps6586x->gpio.can_sleep	= 1;

 	/* FIXME: add handling of GPIOs as dedicated inputs */
 	tps6586x->gpio.direction_output	= tps6586x_gpio_output;
 	tps6586x->gpio.set		= tps6586x_gpio_set;
 	tps6586x->gpio.get		= tps6586x_gpio_get;

 	ret = gpiochip_add(&tps6586x->gpio);
 	if (ret)
 		dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);
 }

 static int __remove_subdev(struct device *dev, void *unused)
 {
 	platform_device_unregister(to_platform_device(dev));
 	return 0;
 }

 static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
 {
 	return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
 }

 static void tps6586x_irq_lock(struct irq_data *data)
 {
 	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);

 	mutex_lock(&tps6586x->irq_lock);
 }

 static void tps6586x_irq_enable(struct irq_data *irq_data)
 {
 	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
 	unsigned int __irq = irq_data->irq - tps6586x->irq_base;
 	const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];

 	tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
 	tps6586x->irq_en |= (1 << __irq);
 }

 static void tps6586x_irq_disable(struct irq_data *irq_data)
 {
 	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);

 	unsigned int __irq = irq_data->irq - tps6586x->irq_base;
 	const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];

 	tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
 	tps6586x->irq_en &= ~(1 << __irq);
 }

 static void tps6586x_irq_sync_unlock(struct irq_data *data)
 {
 	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
 	int i;

 	for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
 		if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
 			if (!WARN_ON(tps6586x_write(tps6586x->dev,
 						    TPS6586X_INT_MASK1 + i,
 						    tps6586x->mask_reg[i])))
 				tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
 		}
 	}

 	mutex_unlock(&tps6586x->irq_lock);
 }

 static irqreturn_t tps6586x_irq(int irq, void *data)
 {
 	struct tps6586x *tps6586x = data;
 	u32 acks;
 	int ret = 0;

 	ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
 			     sizeof(acks), (uint8_t *)&acks);

 	if (ret < 0) {
 		dev_err(tps6586x->dev, "failed to read interrupt status\n");
 		return IRQ_NONE;
 	}

 	acks = le32_to_cpu(acks);

 	while (acks) {
 		int i = __ffs(acks);

 		if (tps6586x->irq_en & (1 << i))
 			handle_nested_irq(tps6586x->irq_base + i);

 		acks &= ~(1 << i);
 	}

 	return IRQ_HANDLED;
 }

 static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
 				       int irq_base)
 {
 	int i, ret;
 	u8 tmp[4];

 	if (!irq_base) {
 		dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
 		return -EINVAL;
 	}

 	mutex_init(&tps6586x->irq_lock);
 	for (i = 0; i < 5; i++) {
 		tps6586x->mask_cache[i] = 0xff;
 		tps6586x->mask_reg[i] = 0xff;
 		tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
 	}

 	tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);

 	tps6586x->irq_base = irq_base;

 	tps6586x->irq_chip.name = "tps6586x";
 	tps6586x->irq_chip.irq_enable = tps6586x_irq_enable;
 	tps6586x->irq_chip.irq_disable = tps6586x_irq_disable;
 	tps6586x->irq_chip.irq_bus_lock = tps6586x_irq_lock;
 	tps6586x->irq_chip.irq_bus_sync_unlock = tps6586x_irq_sync_unlock;

 	for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
 		int __irq = i + tps6586x->irq_base;
 		set_irq_chip_data(__irq, tps6586x);
 		set_irq_chip_and_handler(__irq, &tps6586x->irq_chip,
 					 handle_simple_irq);
 		set_irq_nested_thread(__irq, 1);
 #ifdef CONFIG_ARM
 		set_irq_flags(__irq, IRQF_VALID);
 #endif
 	}

 	ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
 				   "tps6586x", tps6586x);

 	if (!ret) {
 		device_init_wakeup(tps6586x->dev, 1);
 		enable_irq_wake(irq);
 	}

 	return ret;
 }

 static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
 					  struct tps6586x_platform_data *pdata)
 {
 	struct tps6586x_subdev_info *subdev;
 	struct platform_device *pdev;
 	int i, ret = 0;

 	for (i = 0; i < pdata->num_subdevs; i++) {
 		subdev = &pdata->subdevs[i];

 		pdev = platform_device_alloc(subdev->name, subdev->id);
 		if (!pdev) {
 			ret = -ENOMEM;
 			goto failed;
 		}

 		pdev->dev.parent = tps6586x->dev;
 		pdev->dev.platform_data = subdev->platform_data;

 		ret = platform_device_add(pdev);
 		if (ret) {
 			platform_device_put(pdev);
 			goto failed;
 		}
 	}
 	return 0;

 failed:
 	tps6586x_remove_subdevs(tps6586x);
 	return ret;
 }

 static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
 	struct tps6586x_platform_data *pdata = client->dev.platform_data;
 	struct tps6586x *tps6586x;
 	int ret;

 	if (!pdata) {
 		dev_err(&client->dev, "tps6586x requires platform data\n");
 		return -ENOTSUPP;
 	}

 	ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
 	if (ret < 0) {
 		dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
 		return -EIO;
 	}

 	dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);

 	tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
 	if (tps6586x == NULL)
 		return -ENOMEM;

 	tps6586x->client = client;
 	tps6586x->dev = &client->dev;
 	i2c_set_clientdata(client, tps6586x);

 	mutex_init(&tps6586x->lock);

 	if (client->irq) {
 		ret = tps6586x_irq_init(tps6586x, client->irq,
 					pdata->irq_base);
 		if (ret) {
 			dev_err(&client->dev, "IRQ init failed: %d\n", ret);
 			goto err_irq_init;
 		}
 	}

 	ret = tps6586x_add_subdevs(tps6586x, pdata);
 	if (ret) {
 		dev_err(&client->dev, "add devices failed: %d\n", ret);
 		goto err_add_devs;
 	}

 	tps6586x_gpio_init(tps6586x, pdata->gpio_base);

 	return 0;

 err_add_devs:
 	if (client->irq)
 		free_irq(client->irq, tps6586x);
 err_irq_init:
 	kfree(tps6586x);
 	return ret;
 }

 static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
 {
 	struct tps6586x *tps6586x = i2c_get_clientdata(client);
 	struct tps6586x_platform_data *pdata = client->dev.platform_data;
 	int ret;

 	if (client->irq)
 		free_irq(client->irq, tps6586x);

 	if (pdata->gpio_base) {
 		ret = gpiochip_remove(&tps6586x->gpio);
 		if (ret)
 			dev_err(&client->dev, "Can't remove gpio chip: %d\n",
 				ret);
 	}

 	tps6586x_remove_subdevs(tps6586x);
 	kfree(tps6586x);
 	return 0;
 }

 static const struct i2c_device_id tps6586x_id_table[] = {
 	{ "tps6586x", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);

 static struct i2c_driver tps6586x_driver = {
 	.driver	= {
 		.name	= "tps6586x",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= tps6586x_i2c_probe,
 	.remove		= __devexit_p(tps6586x_i2c_remove),
 	.id_table	= tps6586x_id_table,
 };

 static int __init tps6586x_init(void)
 {
 	return i2c_add_driver(&tps6586x_driver);
 }
 subsys_initcall(tps6586x_init);

 static void __exit tps6586x_exit(void)
 {
 	i2c_del_driver(&tps6586x_driver);
 }
 module_exit(tps6586x_exit);

 MODULE_DESCRIPTION("TPS6586X core driver");
 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 MODULE_LICENSE("GPL");
	/*
	* Core driver for TI TPS6586x PMIC family
	*
	* Copyright (c) 2010 CompuLab Ltd.
	* Mike Rapoport <mike@compulab.co.il>
	*
	* Based on da903x.c.
	* Copyright (C) 2008 Compulab, Ltd.
	* Mike Rapoport <mike@compulab.co.il>
	* Copyright (C) 2006-2008 Marvell International Ltd.
	* Eric Miao <eric.miao@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/interrupt.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/i2c.h>

	#include <linux/mfd/core.h>
	#include <linux/mfd/tps6586x.h>

	/* GPIO control registers */
	#define TPS6586X_GPIOSET1 0x5d
	#define TPS6586X_GPIOSET2 0x5e

	/* interrupt control registers */
	#define TPS6586X_INT_ACK1 0xb5
	#define TPS6586X_INT_ACK2 0xb6
	#define TPS6586X_INT_ACK3 0xb7
	#define TPS6586X_INT_ACK4 0xb8

	/* interrupt mask registers */
	#define TPS6586X_INT_MASK1 0xb0
	#define TPS6586X_INT_MASK2 0xb1
	#define TPS6586X_INT_MASK3 0xb2
	#define TPS6586X_INT_MASK4 0xb3
	#define TPS6586X_INT_MASK5 0xb4

	/* device id */
	#define TPS6586X_VERSIONCRC 0xcd

	struct tps6586x_irq_data {
	u8 mask_reg;
	u8 mask_mask;
	};

	#define TPS6586X_IRQ(_reg, _mask) \
	{ \
	.mask_reg = (_reg) - TPS6586X_INT_MASK1, \
	.mask_mask = (_mask), \
	}

	static const struct tps6586x_irq_data tps6586x_irqs[] = {
	[TPS6586X_INT_PLDO_0] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
	[TPS6586X_INT_PLDO_1] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
	[TPS6586X_INT_PLDO_2] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
	[TPS6586X_INT_PLDO_3] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
	[TPS6586X_INT_PLDO_4] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
	[TPS6586X_INT_PLDO_5] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
	[TPS6586X_INT_PLDO_6] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
	[TPS6586X_INT_PLDO_7] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
	[TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
	[TPS6586X_INT_ADC] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
	[TPS6586X_INT_PLDO_8] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
	[TPS6586X_INT_PLDO_9] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
	[TPS6586X_INT_PSM_0] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
	[TPS6586X_INT_PSM_1] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
	[TPS6586X_INT_PSM_2] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
	[TPS6586X_INT_PSM_3] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
	[TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
	[TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
	[TPS6586X_INT_USB_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
	[TPS6586X_INT_AC_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
	[TPS6586X_INT_BAT_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
	[TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
	[TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
	[TPS6586X_INT_PP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
	[TPS6586X_INT_RESUME] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
	[TPS6586X_INT_LOW_SYS] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
	[TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
	};

	struct tps6586x {
	struct mutex lock;
	struct device *dev;
	struct i2c_client *client;

	struct gpio_chip gpio;
	struct irq_chip irq_chip;
	struct mutex irq_lock;
	int irq_base;
	u32 irq_en;
	u8 mask_cache[5];
	u8 mask_reg[5];
	};

	static inline int __tps6586x_read(struct i2c_client *client,
	int reg, uint8_t *val)
	{
	int ret;

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0) {
	dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
	return ret;
	}

	*val = (uint8_t)ret;

	return 0;
	}

	static inline int __tps6586x_reads(struct i2c_client *client, int reg,
	int len, uint8_t *val)
	{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
	if (ret < 0) {
	dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
	return ret;
	}

	return 0;
	}

	static inline int __tps6586x_write(struct i2c_client *client,
	int reg, uint8_t val)
	{
	int ret;

	ret = i2c_smbus_write_byte_data(client, reg, val);
	if (ret < 0) {
	dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
	val, reg);
	return ret;
	}

	return 0;
	}

	static inline int __tps6586x_writes(struct i2c_client *client, int reg,
	int len, uint8_t *val)
	{
	int ret, i;

	for (i = 0; i < len; i++) {
	ret = __tps6586x_write(client, reg + i, *(val + i));
	if (ret < 0)
	return ret;
	}

	return 0;
	}

	int tps6586x_write(struct device *dev, int reg, uint8_t val)
	{
	return __tps6586x_write(to_i2c_client(dev), reg, val);
	}
	EXPORT_SYMBOL_GPL(tps6586x_write);

	int tps6586x_writes(struct device dev, int reg, int len, uint8_t val)
	{
	return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
	}
	EXPORT_SYMBOL_GPL(tps6586x_writes);

	int tps6586x_read(struct device dev, int reg, uint8_t val)
	{
	return __tps6586x_read(to_i2c_client(dev), reg, val);
	}
	EXPORT_SYMBOL_GPL(tps6586x_read);

	int tps6586x_reads(struct device dev, int reg, int len, uint8_t val)
	{
	return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
	}
	EXPORT_SYMBOL_GPL(tps6586x_reads);

	int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
	{
	struct tps6586x *tps6586x = dev_get_drvdata(dev);
	uint8_t reg_val;
	int ret = 0;

	mutex_lock(&tps6586x->lock);

	ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
	if (ret)
	goto out;

	if ((reg_val & bit_mask) == 0) {
	reg_val \|= bit_mask;
	ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
	}
	out:
	mutex_unlock(&tps6586x->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(tps6586x_set_bits);

	int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
	{
	struct tps6586x *tps6586x = dev_get_drvdata(dev);
	uint8_t reg_val;
	int ret = 0;

	mutex_lock(&tps6586x->lock);

	ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
	if (ret)
	goto out;

	if (reg_val & bit_mask) {
	reg_val &= ~bit_mask;
	ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
	}
	out:
	mutex_unlock(&tps6586x->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(tps6586x_clr_bits);

	int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
	{
	struct tps6586x *tps6586x = dev_get_drvdata(dev);
	uint8_t reg_val;
	int ret = 0;

	mutex_lock(&tps6586x->lock);

	ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
	if (ret)
	goto out;

	if ((reg_val & mask) != val) {
	reg_val = (reg_val & ~mask) \| val;
	ret = __tps6586x_write(tps6586x->client, reg, reg_val);
	}
	out:
	mutex_unlock(&tps6586x->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(tps6586x_update);

	static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
	{
	struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
	uint8_t val;
	int ret;

	ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
	if (ret)
	return ret;

	return !!(val & (1 << offset));
	}


	static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
	int value)
	{
	struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);

	__tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,
	value << offset);
	}

	static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
	int value)
	{
	struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
	uint8_t val, mask;

	tps6586x_gpio_set(gc, offset, value);

	val = 0x1 << (offset * 2);
	mask = 0x3 << (offset * 2);

	return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
	}

	static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
	{
	int ret;

	if (!gpio_base)
	return;

	tps6586x->gpio.owner = THIS_MODULE;
	tps6586x->gpio.label = tps6586x->client->name;
	tps6586x->gpio.dev = tps6586x->dev;
	tps6586x->gpio.base = gpio_base;
	tps6586x->gpio.ngpio = 4;
	tps6586x->gpio.can_sleep = 1;

	/* FIXME: add handling of GPIOs as dedicated inputs */
	tps6586x->gpio.direction_output = tps6586x_gpio_output;
	tps6586x->gpio.set = tps6586x_gpio_set;
	tps6586x->gpio.get = tps6586x_gpio_get;

	ret = gpiochip_add(&tps6586x->gpio);
	if (ret)
	dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);
	}

	static int __remove_subdev(struct device dev, void unused)
	{
	platform_device_unregister(to_platform_device(dev));
	return 0;
	}

	static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
	{
	return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
	}

	static void tps6586x_irq_lock(struct irq_data *data)
	{
	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);

	mutex_lock(&tps6586x->irq_lock);
	}

	static void tps6586x_irq_enable(struct irq_data *irq_data)
	{
	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
	unsigned int __irq = irq_data->irq - tps6586x->irq_base;
	const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];

	tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
	tps6586x->irq_en \|= (1 << __irq);
	}

	static void tps6586x_irq_disable(struct irq_data *irq_data)
	{
	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);

	unsigned int __irq = irq_data->irq - tps6586x->irq_base;
	const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];

	tps6586x->mask_reg[data->mask_reg] \|= data->mask_mask;
	tps6586x->irq_en &= ~(1 << __irq);
	}

	static void tps6586x_irq_sync_unlock(struct irq_data *data)
	{
	struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
	int i;

	for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
	if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
	if (!WARN_ON(tps6586x_write(tps6586x->dev,
	TPS6586X_INT_MASK1 + i,
	tps6586x->mask_reg[i])))
	tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
	}
	}

	mutex_unlock(&tps6586x->irq_lock);
	}

	static irqreturn_t tps6586x_irq(int irq, void *data)
	{
	struct tps6586x *tps6586x = data;
	u32 acks;
	int ret = 0;

	ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
	sizeof(acks), (uint8_t *)&acks);

	if (ret < 0) {
	dev_err(tps6586x->dev, "failed to read interrupt status\n");
	return IRQ_NONE;
	}

	acks = le32_to_cpu(acks);

	while (acks) {
	int i = __ffs(acks);

	if (tps6586x->irq_en & (1 << i))
	handle_nested_irq(tps6586x->irq_base + i);

	acks &= ~(1 << i);
	}

	return IRQ_HANDLED;
	}

	static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
	int irq_base)
	{
	int i, ret;
	u8 tmp[4];

	if (!irq_base) {
	dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
	return -EINVAL;
	}

	mutex_init(&tps6586x->irq_lock);
	for (i = 0; i < 5; i++) {
	tps6586x->mask_cache[i] = 0xff;
	tps6586x->mask_reg[i] = 0xff;
	tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
	}

	tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);

	tps6586x->irq_base = irq_base;

	tps6586x->irq_chip.name = "tps6586x";
	tps6586x->irq_chip.irq_enable = tps6586x_irq_enable;
	tps6586x->irq_chip.irq_disable = tps6586x_irq_disable;
	tps6586x->irq_chip.irq_bus_lock = tps6586x_irq_lock;
	tps6586x->irq_chip.irq_bus_sync_unlock = tps6586x_irq_sync_unlock;

	for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
	int __irq = i + tps6586x->irq_base;
	set_irq_chip_data(__irq, tps6586x);
	set_irq_chip_and_handler(__irq, &tps6586x->irq_chip,
	handle_simple_irq);
	set_irq_nested_thread(__irq, 1);
	#ifdef CONFIG_ARM
	set_irq_flags(__irq, IRQF_VALID);
	#endif
	}

	ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
	"tps6586x", tps6586x);

	if (!ret) {
	device_init_wakeup(tps6586x->dev, 1);
	enable_irq_wake(irq);
	}

	return ret;
	}

	static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
	struct tps6586x_platform_data *pdata)
	{
	struct tps6586x_subdev_info *subdev;
	struct platform_device *pdev;
	int i, ret = 0;

	for (i = 0; i < pdata->num_subdevs; i++) {
	subdev = &pdata->subdevs[i];

	pdev = platform_device_alloc(subdev->name, subdev->id);
	if (!pdev) {
	ret = -ENOMEM;
	goto failed;
	}

	pdev->dev.parent = tps6586x->dev;
	pdev->dev.platform_data = subdev->platform_data;

	ret = platform_device_add(pdev);
	if (ret) {
	platform_device_put(pdev);
	goto failed;
	}
	}
	return 0;

	failed:
	tps6586x_remove_subdevs(tps6586x);
	return ret;
	}

	static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tps6586x_platform_data *pdata = client->dev.platform_data;
	struct tps6586x *tps6586x;
	int ret;

	if (!pdata) {
	dev_err(&client->dev, "tps6586x requires platform data\n");
	return -ENOTSUPP;
	}

	ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
	if (ret < 0) {
	dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
	return -EIO;
	}

	dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);

	tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
	if (tps6586x == NULL)
	return -ENOMEM;

	tps6586x->client = client;
	tps6586x->dev = &client->dev;
	i2c_set_clientdata(client, tps6586x);

	mutex_init(&tps6586x->lock);

	if (client->irq) {
	ret = tps6586x_irq_init(tps6586x, client->irq,
	pdata->irq_base);
	if (ret) {
	dev_err(&client->dev, "IRQ init failed: %d\n", ret);
	goto err_irq_init;
	}
	}

	ret = tps6586x_add_subdevs(tps6586x, pdata);
	if (ret) {
	dev_err(&client->dev, "add devices failed: %d\n", ret);
	goto err_add_devs;
	}

	tps6586x_gpio_init(tps6586x, pdata->gpio_base);

	return 0;

	err_add_devs:
	if (client->irq)
	free_irq(client->irq, tps6586x);
	err_irq_init:
	kfree(tps6586x);
	return ret;
	}

	static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
	{
	struct tps6586x *tps6586x = i2c_get_clientdata(client);
	struct tps6586x_platform_data *pdata = client->dev.platform_data;
	int ret;

	if (client->irq)
	free_irq(client->irq, tps6586x);

	if (pdata->gpio_base) {
	ret = gpiochip_remove(&tps6586x->gpio);
	if (ret)
	dev_err(&client->dev, "Can't remove gpio chip: %d\n",
	ret);
	}

	tps6586x_remove_subdevs(tps6586x);
	kfree(tps6586x);
	return 0;
	}

	static const struct i2c_device_id tps6586x_id_table[] = {
	{ "tps6586x", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);

	static struct i2c_driver tps6586x_driver = {
	.driver = {
	.name = "tps6586x",
	.owner = THIS_MODULE,
	},
	.probe = tps6586x_i2c_probe,
	.remove = __devexit_p(tps6586x_i2c_remove),
	.id_table = tps6586x_id_table,
	};

	static int __init tps6586x_init(void)
	{
	return i2c_add_driver(&tps6586x_driver);
	}
	subsys_initcall(tps6586x_init);

	static void __exit tps6586x_exit(void)
	{
	i2c_del_driver(&tps6586x_driver);
	}
	module_exit(tps6586x_exit);

	MODULE_DESCRIPTION("TPS6586X core driver");
	MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
	MODULE_LICENSE("GPL");