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/err.h>
 #include <linux/i2c.h>
 #include <linux/regmap.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/machine.h>

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

 /* 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

 /* Maximum register */
 #define TPS6586X_MAX_REGISTER	(TPS6586X_VERSIONCRC + 1)

 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),
 };

 static struct mfd_cell tps6586x_cell[] = {
 	{
 		.name = "tps6586x-gpio",
 	},
 	{
 		.name = "tps6586x-rtc",
 	},
 	{
 		.name = "tps6586x-onkey",
 	},
 };

 struct tps6586x {
 	struct device		*dev;
 	struct i2c_client	*client;
 	struct regmap		*regmap;

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

 static inline struct tps6586x *dev_to_tps6586x(struct device *dev)
 {
 	return i2c_get_clientdata(to_i2c_client(dev));
 }

 int tps6586x_write(struct device *dev, int reg, uint8_t val)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

 	return regmap_write(tps6586x->regmap, reg, val);
 }
 EXPORT_SYMBOL_GPL(tps6586x_write);

 int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

 	return regmap_bulk_write(tps6586x->regmap, reg, val, len);
 }
 EXPORT_SYMBOL_GPL(tps6586x_writes);

 int tps6586x_read(struct device *dev, int reg, uint8_t *val)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);
 	unsigned int rval;
 	int ret;

 	ret = regmap_read(tps6586x->regmap, reg, &rval);
 	if (!ret)
 		*val = rval;
 	return ret;
 }
 EXPORT_SYMBOL_GPL(tps6586x_read);

 int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

 	return regmap_bulk_read(tps6586x->regmap, reg, val, len);
 }
 EXPORT_SYMBOL_GPL(tps6586x_reads);

 int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

 	return regmap_update_bits(tps6586x->regmap, reg, bit_mask, bit_mask);
 }
 EXPORT_SYMBOL_GPL(tps6586x_set_bits);

 int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

 	return regmap_update_bits(tps6586x->regmap, reg, bit_mask, 0);
 }
 EXPORT_SYMBOL_GPL(tps6586x_clr_bits);

 int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
 {
 	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

 	return regmap_update_bits(tps6586x->regmap, reg, mask, val);
 }
 EXPORT_SYMBOL_GPL(tps6586x_update);

 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++) {
 		int ret;
 		ret = tps6586x_write(tps6586x->dev,
 					    TPS6586X_INT_MASK1 + i,
 					    tps6586x->mask_reg[i]);
 		WARN_ON(ret);
 	}

 	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_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;
 		irq_set_chip_data(__irq, tps6586x);
 		irq_set_chip_and_handler(__irq, &tps6586x->irq_chip,
 					 handle_simple_irq);
 		irq_set_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;
 		pdev->dev.of_node = subdev->of_node;

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

 failed:
 	tps6586x_remove_subdevs(tps6586x);
 	return ret;
 }

 #ifdef CONFIG_OF
 static struct of_regulator_match tps6586x_matches[] = {
 	{ .name = "sys",     .driver_data = (void *)TPS6586X_ID_SYS     },
 	{ .name = "sm0",     .driver_data = (void *)TPS6586X_ID_SM_0    },
 	{ .name = "sm1",     .driver_data = (void *)TPS6586X_ID_SM_1    },
 	{ .name = "sm2",     .driver_data = (void *)TPS6586X_ID_SM_2    },
 	{ .name = "ldo0",    .driver_data = (void *)TPS6586X_ID_LDO_0   },
 	{ .name = "ldo1",    .driver_data = (void *)TPS6586X_ID_LDO_1   },
 	{ .name = "ldo2",    .driver_data = (void *)TPS6586X_ID_LDO_2   },
 	{ .name = "ldo3",    .driver_data = (void *)TPS6586X_ID_LDO_3   },
 	{ .name = "ldo4",    .driver_data = (void *)TPS6586X_ID_LDO_4   },
 	{ .name = "ldo5",    .driver_data = (void *)TPS6586X_ID_LDO_5   },
 	{ .name = "ldo6",    .driver_data = (void *)TPS6586X_ID_LDO_6   },
 	{ .name = "ldo7",    .driver_data = (void *)TPS6586X_ID_LDO_7   },
 	{ .name = "ldo8",    .driver_data = (void *)TPS6586X_ID_LDO_8   },
 	{ .name = "ldo9",    .driver_data = (void *)TPS6586X_ID_LDO_9   },
 	{ .name = "ldo_rtc", .driver_data = (void *)TPS6586X_ID_LDO_RTC },
 };

 static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
 {
 	const unsigned int num = ARRAY_SIZE(tps6586x_matches);
 	struct device_node *np = client->dev.of_node;
 	struct tps6586x_platform_data *pdata;
 	struct tps6586x_subdev_info *devs;
 	struct device_node *regs;
 	const char *sys_rail_name = NULL;
 	unsigned int count;
 	unsigned int i, j;
 	int err;

 	regs = of_find_node_by_name(np, "regulators");
 	if (!regs)
 		return NULL;

 	err = of_regulator_match(&client->dev, regs, tps6586x_matches, num);
 	if (err < 0) {
 		of_node_put(regs);
 		return NULL;
 	}

 	of_node_put(regs);
 	count = err;

 	devs = devm_kzalloc(&client->dev, count * sizeof(*devs), GFP_KERNEL);
 	if (!devs)
 		return NULL;

 	for (i = 0, j = 0; i < num && j < count; i++) {
 		struct regulator_init_data *reg_idata;

 		if (!tps6586x_matches[i].init_data)
 			continue;

 		reg_idata  = tps6586x_matches[i].init_data;
 		devs[j].name = "tps6586x-regulator";
 		devs[j].platform_data = tps6586x_matches[i].init_data;
 		devs[j].id = (int)tps6586x_matches[i].driver_data;
 		if (devs[j].id == TPS6586X_ID_SYS)
 			sys_rail_name = reg_idata->constraints.name;

 		if ((devs[j].id == TPS6586X_ID_LDO_5) ||
 			(devs[j].id == TPS6586X_ID_LDO_RTC))
 			reg_idata->supply_regulator = sys_rail_name;

 		devs[j].of_node = tps6586x_matches[i].of_node;
 		j++;
 	}

 	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return NULL;

 	pdata->num_subdevs = count;
 	pdata->subdevs = devs;
 	pdata->gpio_base = -1;
 	pdata->irq_base = -1;

 	return pdata;
 }

 static struct of_device_id tps6586x_of_match[] = {
 	{ .compatible = "ti,tps6586x", },
 	{ },
 };
 #else
 static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
 {
 	return NULL;
 }
 #endif

 static bool is_volatile_reg(struct device *dev, unsigned int reg)
 {
 	/* Cache all interrupt mask register */
 	if ((reg >= TPS6586X_INT_MASK1) && (reg <= TPS6586X_INT_MASK5))
 		return false;

 	return true;
 }

 static const struct regmap_config tps6586x_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = TPS6586X_MAX_REGISTER - 1,
 	.volatile_reg = is_volatile_reg,
 	.cache_type = REGCACHE_RBTREE,
 };

 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 && client->dev.of_node)
 		pdata = tps6586x_parse_dt(client);

 	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 = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
 	if (tps6586x == NULL) {
 		dev_err(&client->dev, "memory for tps6586x alloc failed\n");
 		return -ENOMEM;
 	}

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

 	tps6586x->regmap = devm_regmap_init_i2c(client,
 					&tps6586x_regmap_config);
 	if (IS_ERR(tps6586x->regmap)) {
 		ret = PTR_ERR(tps6586x->regmap);
 		dev_err(&client->dev, "regmap init failed: %d\n", ret);
 		return ret;
 	}


 	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);
 			return ret;
 		}
 	}

 	ret = mfd_add_devices(tps6586x->dev, -1,
 			      tps6586x_cell, ARRAY_SIZE(tps6586x_cell),
 			      NULL, 0, NULL);
 	if (ret < 0) {
 		dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
 		goto err_mfd_add;
 	}

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

 	return 0;

 err_add_devs:
 	mfd_remove_devices(tps6586x->dev);
 err_mfd_add:
 	if (client->irq)
 		free_irq(client->irq, tps6586x);
 	return ret;
 }

 static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
 {
 	struct tps6586x *tps6586x = i2c_get_clientdata(client);

 	tps6586x_remove_subdevs(tps6586x);
 	mfd_remove_devices(tps6586x->dev);
 	if (client->irq)
 		free_irq(client->irq, 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,
 		.of_match_table = of_match_ptr(tps6586x_of_match),
 	},
 	.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/err.h>
	#include <linux/i2c.h>
	#include <linux/regmap.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/regulator/machine.h>

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

	/* 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

	/* Maximum register */
	#define TPS6586X_MAX_REGISTER (TPS6586X_VERSIONCRC + 1)

	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),
	};

	static struct mfd_cell tps6586x_cell[] = {
	{
	.name = "tps6586x-gpio",
	},
	{
	.name = "tps6586x-rtc",
	},
	{
	.name = "tps6586x-onkey",
	},
	};

	struct tps6586x {
	struct device *dev;
	struct i2c_client *client;
	struct regmap *regmap;

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

	static inline struct tps6586x dev_to_tps6586x(struct device dev)
	{
	return i2c_get_clientdata(to_i2c_client(dev));
	}

	int tps6586x_write(struct device *dev, int reg, uint8_t val)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

	return regmap_write(tps6586x->regmap, reg, val);
	}
	EXPORT_SYMBOL_GPL(tps6586x_write);

	int tps6586x_writes(struct device dev, int reg, int len, uint8_t val)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

	return regmap_bulk_write(tps6586x->regmap, reg, val, len);
	}
	EXPORT_SYMBOL_GPL(tps6586x_writes);

	int tps6586x_read(struct device dev, int reg, uint8_t val)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);
	unsigned int rval;
	int ret;

	ret = regmap_read(tps6586x->regmap, reg, &rval);
	if (!ret)
	*val = rval;
	return ret;
	}
	EXPORT_SYMBOL_GPL(tps6586x_read);

	int tps6586x_reads(struct device dev, int reg, int len, uint8_t val)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

	return regmap_bulk_read(tps6586x->regmap, reg, val, len);
	}
	EXPORT_SYMBOL_GPL(tps6586x_reads);

	int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

	return regmap_update_bits(tps6586x->regmap, reg, bit_mask, bit_mask);
	}
	EXPORT_SYMBOL_GPL(tps6586x_set_bits);

	int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

	return regmap_update_bits(tps6586x->regmap, reg, bit_mask, 0);
	}
	EXPORT_SYMBOL_GPL(tps6586x_clr_bits);

	int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
	{
	struct tps6586x *tps6586x = dev_to_tps6586x(dev);

	return regmap_update_bits(tps6586x->regmap, reg, mask, val);
	}
	EXPORT_SYMBOL_GPL(tps6586x_update);

	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++) {
	int ret;
	ret = tps6586x_write(tps6586x->dev,
	TPS6586X_INT_MASK1 + i,
	tps6586x->mask_reg[i]);
	WARN_ON(ret);
	}

	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_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;
	irq_set_chip_data(__irq, tps6586x);
	irq_set_chip_and_handler(__irq, &tps6586x->irq_chip,
	handle_simple_irq);
	irq_set_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;
	pdev->dev.of_node = subdev->of_node;

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

	failed:
	tps6586x_remove_subdevs(tps6586x);
	return ret;
	}

	#ifdef CONFIG_OF
	static struct of_regulator_match tps6586x_matches[] = {
	{ .name = "sys", .driver_data = (void *)TPS6586X_ID_SYS },
	{ .name = "sm0", .driver_data = (void *)TPS6586X_ID_SM_0 },
	{ .name = "sm1", .driver_data = (void *)TPS6586X_ID_SM_1 },
	{ .name = "sm2", .driver_data = (void *)TPS6586X_ID_SM_2 },
	{ .name = "ldo0", .driver_data = (void *)TPS6586X_ID_LDO_0 },
	{ .name = "ldo1", .driver_data = (void *)TPS6586X_ID_LDO_1 },
	{ .name = "ldo2", .driver_data = (void *)TPS6586X_ID_LDO_2 },
	{ .name = "ldo3", .driver_data = (void *)TPS6586X_ID_LDO_3 },
	{ .name = "ldo4", .driver_data = (void *)TPS6586X_ID_LDO_4 },
	{ .name = "ldo5", .driver_data = (void *)TPS6586X_ID_LDO_5 },
	{ .name = "ldo6", .driver_data = (void *)TPS6586X_ID_LDO_6 },
	{ .name = "ldo7", .driver_data = (void *)TPS6586X_ID_LDO_7 },
	{ .name = "ldo8", .driver_data = (void *)TPS6586X_ID_LDO_8 },
	{ .name = "ldo9", .driver_data = (void *)TPS6586X_ID_LDO_9 },
	{ .name = "ldo_rtc", .driver_data = (void *)TPS6586X_ID_LDO_RTC },
	};

	static struct tps6586x_platform_data tps6586x_parse_dt(struct i2c_client client)
	{
	const unsigned int num = ARRAY_SIZE(tps6586x_matches);
	struct device_node *np = client->dev.of_node;
	struct tps6586x_platform_data *pdata;
	struct tps6586x_subdev_info *devs;
	struct device_node *regs;
	const char *sys_rail_name = NULL;
	unsigned int count;
	unsigned int i, j;
	int err;

	regs = of_find_node_by_name(np, "regulators");
	if (!regs)
	return NULL;

	err = of_regulator_match(&client->dev, regs, tps6586x_matches, num);
	if (err < 0) {
	of_node_put(regs);
	return NULL;
	}

	of_node_put(regs);
	count = err;

	devs = devm_kzalloc(&client->dev, count * sizeof(*devs), GFP_KERNEL);
	if (!devs)
	return NULL;

	for (i = 0, j = 0; i < num && j < count; i++) {
	struct regulator_init_data *reg_idata;

	if (!tps6586x_matches[i].init_data)
	continue;

	reg_idata = tps6586x_matches[i].init_data;
	devs[j].name = "tps6586x-regulator";
	devs[j].platform_data = tps6586x_matches[i].init_data;
	devs[j].id = (int)tps6586x_matches[i].driver_data;
	if (devs[j].id == TPS6586X_ID_SYS)
	sys_rail_name = reg_idata->constraints.name;

	if ((devs[j].id == TPS6586X_ID_LDO_5) \|\|
	(devs[j].id == TPS6586X_ID_LDO_RTC))
	reg_idata->supply_regulator = sys_rail_name;

	devs[j].of_node = tps6586x_matches[i].of_node;
	j++;
	}

	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return NULL;

	pdata->num_subdevs = count;
	pdata->subdevs = devs;
	pdata->gpio_base = -1;
	pdata->irq_base = -1;

	return pdata;
	}

	static struct of_device_id tps6586x_of_match[] = {
	{ .compatible = "ti,tps6586x", },
	{ },
	};
	#else
	static struct tps6586x_platform_data tps6586x_parse_dt(struct i2c_client client)
	{
	return NULL;
	}
	#endif

	static bool is_volatile_reg(struct device *dev, unsigned int reg)
	{
	/* Cache all interrupt mask register */
	if ((reg >= TPS6586X_INT_MASK1) && (reg <= TPS6586X_INT_MASK5))
	return false;

	return true;
	}

	static const struct regmap_config tps6586x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = TPS6586X_MAX_REGISTER - 1,
	.volatile_reg = is_volatile_reg,
	.cache_type = REGCACHE_RBTREE,
	};

	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 && client->dev.of_node)
	pdata = tps6586x_parse_dt(client);

	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 = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
	if (tps6586x == NULL) {
	dev_err(&client->dev, "memory for tps6586x alloc failed\n");
	return -ENOMEM;
	}

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

	tps6586x->regmap = devm_regmap_init_i2c(client,
	&tps6586x_regmap_config);
	if (IS_ERR(tps6586x->regmap)) {
	ret = PTR_ERR(tps6586x->regmap);
	dev_err(&client->dev, "regmap init failed: %d\n", ret);
	return ret;
	}


	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);
	return ret;
	}
	}

	ret = mfd_add_devices(tps6586x->dev, -1,
	tps6586x_cell, ARRAY_SIZE(tps6586x_cell),
	NULL, 0, NULL);
	if (ret < 0) {
	dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
	goto err_mfd_add;
	}

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

	return 0;

	err_add_devs:
	mfd_remove_devices(tps6586x->dev);
	err_mfd_add:
	if (client->irq)
	free_irq(client->irq, tps6586x);
	return ret;
	}

	static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
	{
	struct tps6586x *tps6586x = i2c_get_clientdata(client);

	tps6586x_remove_subdevs(tps6586x);
	mfd_remove_devices(tps6586x->dev);
	if (client->irq)
	free_irq(client->irq, 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,
	.of_match_table = of_match_ptr(tps6586x_of_match),
	},
	.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");