drivers/mfd/tps65217.c - linux - Git at Google

 /*
  * tps65217.c
  *
  * TPS65217 chip family multi-function driver
  *
  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 #include <linux/mfd/core.h>
 #include <linux/mfd/tps65217.h>

 static struct resource charger_resources[] = {
 	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
 	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
 };

 static struct resource pb_resources[] = {
 	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
 };

 struct tps65217_irq {
 	int mask;
 	int interrupt;
 };

 static const struct tps65217_irq tps65217_irqs[] = {
 	[TPS65217_IRQ_PB] = {
 		.mask = TPS65217_INT_PBM,
 		.interrupt = TPS65217_INT_PBI,
 	},
 	[TPS65217_IRQ_AC] = {
 		.mask = TPS65217_INT_ACM,
 		.interrupt = TPS65217_INT_ACI,
 	},
 	[TPS65217_IRQ_USB] = {
 		.mask = TPS65217_INT_USBM,
 		.interrupt = TPS65217_INT_USBI,
 	},
 };

 static void tps65217_irq_lock(struct irq_data *data)
 {
 	struct tps65217 *tps = irq_data_get_irq_chip_data(data);

 	mutex_lock(&tps->irq_lock);
 }

 static void tps65217_irq_sync_unlock(struct irq_data *data)
 {
 	struct tps65217 *tps = irq_data_get_irq_chip_data(data);
 	int ret;

 	ret = tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
 				TPS65217_PROTECT_NONE);
 	if (ret != 0)
 		dev_err(tps->dev, "Failed to sync IRQ masks\n");

 	mutex_unlock(&tps->irq_lock);
 }

 static inline const struct tps65217_irq *
 irq_to_tps65217_irq(struct tps65217 *tps, struct irq_data *data)
 {
 	return &tps65217_irqs[data->hwirq];
 }

 static void tps65217_irq_enable(struct irq_data *data)
 {
 	struct tps65217 *tps = irq_data_get_irq_chip_data(data);
 	const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);

 	tps->irq_mask &= ~irq_data->mask;
 }

 static void tps65217_irq_disable(struct irq_data *data)
 {
 	struct tps65217 *tps = irq_data_get_irq_chip_data(data);
 	const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);

 	tps->irq_mask |= irq_data->mask;
 }

 static struct irq_chip tps65217_irq_chip = {
 	.irq_bus_lock		= tps65217_irq_lock,
 	.irq_bus_sync_unlock	= tps65217_irq_sync_unlock,
 	.irq_enable		= tps65217_irq_enable,
 	.irq_disable		= tps65217_irq_disable,
 };

 static struct mfd_cell tps65217s[] = {
 	{
 		.name = "tps65217-pmic",
 		.of_compatible = "ti,tps65217-pmic",
 	},
 	{
 		.name = "tps65217-bl",
 		.of_compatible = "ti,tps65217-bl",
 	},
 	{
 		.name = "tps65217-charger",
 		.num_resources = ARRAY_SIZE(charger_resources),
 		.resources = charger_resources,
 		.of_compatible = "ti,tps65217-charger",
 	},
 	{
 		.name = "tps65217-pwrbutton",
 		.num_resources = ARRAY_SIZE(pb_resources),
 		.resources = pb_resources,
 		.of_compatible = "ti,tps65217-pwrbutton",
 	},
 };

 static irqreturn_t tps65217_irq_thread(int irq, void *data)
 {
 	struct tps65217 *tps = data;
 	unsigned int status;
 	bool handled = false;
 	int i;
 	int ret;

 	ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status);
 	if (ret < 0) {
 		dev_err(tps->dev, "Failed to read IRQ status: %d\n",
 			ret);
 		return IRQ_NONE;
 	}

 	for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
 		if (status & tps65217_irqs[i].interrupt) {
 			handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
 			handled = true;
 		}
 	}

 	if (handled)
 		return IRQ_HANDLED;

 	return IRQ_NONE;
 }

 static int tps65217_irq_map(struct irq_domain *h, unsigned int virq,
 			irq_hw_number_t hw)
 {
 	struct tps65217 *tps = h->host_data;

 	irq_set_chip_data(virq, tps);
 	irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq);
 	irq_set_nested_thread(virq, 1);
 	irq_set_parent(virq, tps->irq);
 	irq_set_noprobe(virq);

 	return 0;
 }

 static const struct irq_domain_ops tps65217_irq_domain_ops = {
 	.map = tps65217_irq_map,
 };

 static int tps65217_irq_init(struct tps65217 *tps, int irq)
 {
 	int ret;

 	mutex_init(&tps->irq_lock);
 	tps->irq = irq;

 	/* Mask all interrupt sources */
 	tps->irq_mask = (TPS65217_INT_RESERVEDM | TPS65217_INT_PBM
 			| TPS65217_INT_ACM | TPS65217_INT_USBM);
 	tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
 			TPS65217_PROTECT_NONE);

 	tps->irq_domain = irq_domain_add_linear(tps->dev->of_node,
 		TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps);
 	if (!tps->irq_domain) {
 		dev_err(tps->dev, "Could not create IRQ domain\n");
 		return -ENOMEM;
 	}

 	ret = devm_request_threaded_irq(tps->dev, irq, NULL,
 					tps65217_irq_thread, IRQF_ONESHOT,
 					"tps65217-irq", tps);
 	if (ret) {
 		dev_err(tps->dev, "Failed to request IRQ %d: %d\n",
 			irq, ret);
 		return ret;
 	}

 	return 0;
 }

 /**
  * tps65217_reg_read: Read a single tps65217 register.
  *
  * @tps: Device to read from.
  * @reg: Register to read.
  * @val: Contians the value
  */
 int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
 			unsigned int *val)
 {
 	return regmap_read(tps->regmap, reg, val);
 }
 EXPORT_SYMBOL_GPL(tps65217_reg_read);

 /**
  * tps65217_reg_write: Write a single tps65217 register.
  *
  * @tps65217: Device to write to.
  * @reg: Register to write to.
  * @val: Value to write.
  * @level: Password protected level
  */
 int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
 			unsigned int val, unsigned int level)
 {
 	int ret;
 	unsigned int xor_reg_val;

 	switch (level) {
 	case TPS65217_PROTECT_NONE:
 		return regmap_write(tps->regmap, reg, val);
 	case TPS65217_PROTECT_L1:
 		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
 							xor_reg_val);
 		if (ret < 0)
 			return ret;

 		return regmap_write(tps->regmap, reg, val);
 	case TPS65217_PROTECT_L2:
 		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
 							xor_reg_val);
 		if (ret < 0)
 			return ret;
 		ret = regmap_write(tps->regmap, reg, val);
 		if (ret < 0)
 			return ret;
 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
 							xor_reg_val);
 		if (ret < 0)
 			return ret;
 		return regmap_write(tps->regmap, reg, val);
 	default:
 		return -EINVAL;
 	}
 }
 EXPORT_SYMBOL_GPL(tps65217_reg_write);

 /**
  * tps65217_update_bits: Modify bits w.r.t mask, val and level.
  *
  * @tps65217: Device to write to.
  * @reg: Register to read-write to.
  * @mask: Mask.
  * @val: Value to write.
  * @level: Password protected level
  */
 static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
 		unsigned int mask, unsigned int val, unsigned int level)
 {
 	int ret;
 	unsigned int data;

 	ret = tps65217_reg_read(tps, reg, &data);
 	if (ret) {
 		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
 		return ret;
 	}

 	data &= ~mask;
 	data |= val & mask;

 	ret = tps65217_reg_write(tps, reg, data, level);
 	if (ret)
 		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);

 	return ret;
 }

 int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
 		unsigned int mask, unsigned int val, unsigned int level)
 {
 	return tps65217_update_bits(tps, reg, mask, val, level);
 }
 EXPORT_SYMBOL_GPL(tps65217_set_bits);

 int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
 		unsigned int mask, unsigned int level)
 {
 	return tps65217_update_bits(tps, reg, mask, 0, level);
 }
 EXPORT_SYMBOL_GPL(tps65217_clear_bits);

 static bool tps65217_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case TPS65217_REG_INT:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct regmap_config tps65217_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = TPS65217_REG_MAX,
 	.volatile_reg = tps65217_volatile_reg,
 };

 static const struct of_device_id tps65217_of_match[] = {
 	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, tps65217_of_match);

 static int tps65217_probe(struct i2c_client *client,
 				const struct i2c_device_id *ids)
 {
 	struct tps65217 *tps;
 	unsigned int version;
 	unsigned long chip_id = ids->driver_data;
 	const struct of_device_id *match;
 	bool status_off = false;
 	int ret;

 	if (client->dev.of_node) {
 		match = of_match_device(tps65217_of_match, &client->dev);
 		if (!match) {
 			dev_err(&client->dev,
 				"Failed to find matching dt id\n");
 			return -EINVAL;
 		}
 		chip_id = (unsigned long)match->data;
 		status_off = of_property_read_bool(client->dev.of_node,
 					"ti,pmic-shutdown-controller");
 	}

 	if (!chip_id) {
 		dev_err(&client->dev, "id is null.\n");
 		return -ENODEV;
 	}

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

 	i2c_set_clientdata(client, tps);
 	tps->dev = &client->dev;
 	tps->id = chip_id;

 	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 	if (IS_ERR(tps->regmap)) {
 		ret = PTR_ERR(tps->regmap);
 		dev_err(tps->dev, "Failed to allocate register map: %d\n",
 			ret);
 		return ret;
 	}

 	if (client->irq) {
 		tps65217_irq_init(tps, client->irq);
 	} else {
 		int i;

 		/* Don't tell children about IRQ resources which won't fire */
 		for (i = 0; i < ARRAY_SIZE(tps65217s); i++)
 			tps65217s[i].num_resources = 0;
 	}

 	ret = devm_mfd_add_devices(tps->dev, -1, tps65217s,
 				   ARRAY_SIZE(tps65217s), NULL, 0,
 				   tps->irq_domain);
 	if (ret < 0) {
 		dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 		return ret;
 	}

 	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 	if (ret < 0) {
 		dev_err(tps->dev, "Failed to read revision register: %d\n",
 			ret);
 		return ret;
 	}

 	/* Set the PMIC to shutdown on PWR_EN toggle */
 	if (status_off) {
 		ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
 				TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
 				TPS65217_PROTECT_NONE);
 		if (ret)
 			dev_warn(tps->dev, "unable to set the status OFF\n");
 	}

 	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 			(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 			version & TPS65217_CHIPID_REV_MASK);

 	return 0;
 }

 static const struct i2c_device_id tps65217_id_table[] = {
 	{"tps65217", TPS65217},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(i2c, tps65217_id_table);

 static struct i2c_driver tps65217_driver = {
 	.driver		= {
 		.name	= "tps65217",
 		.of_match_table = tps65217_of_match,
 	},
 	.id_table	= tps65217_id_table,
 	.probe		= tps65217_probe,
 };

 static int __init tps65217_init(void)
 {
 	return i2c_add_driver(&tps65217_driver);
 }
 subsys_initcall(tps65217_init);

 static void __exit tps65217_exit(void)
 {
 	i2c_del_driver(&tps65217_driver);
 }
 module_exit(tps65217_exit);

 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 MODULE_LICENSE("GPL v2");
	/*
	* tps65217.c
	*
	* TPS65217 chip family multi-function driver
	*
	* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/i2c.h>
	#include <linux/irq.h>
	#include <linux/irqdomain.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	#include <linux/mfd/core.h>
	#include <linux/mfd/tps65217.h>

	static struct resource charger_resources[] = {
	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
	};

	static struct resource pb_resources[] = {
	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
	};

	struct tps65217_irq {
	int mask;
	int interrupt;
	};

	static const struct tps65217_irq tps65217_irqs[] = {
	[TPS65217_IRQ_PB] = {
	.mask = TPS65217_INT_PBM,
	.interrupt = TPS65217_INT_PBI,
	},
	[TPS65217_IRQ_AC] = {
	.mask = TPS65217_INT_ACM,
	.interrupt = TPS65217_INT_ACI,
	},
	[TPS65217_IRQ_USB] = {
	.mask = TPS65217_INT_USBM,
	.interrupt = TPS65217_INT_USBI,
	},
	};

	static void tps65217_irq_lock(struct irq_data *data)
	{
	struct tps65217 *tps = irq_data_get_irq_chip_data(data);

	mutex_lock(&tps->irq_lock);
	}

	static void tps65217_irq_sync_unlock(struct irq_data *data)
	{
	struct tps65217 *tps = irq_data_get_irq_chip_data(data);
	int ret;

	ret = tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
	TPS65217_PROTECT_NONE);
	if (ret != 0)
	dev_err(tps->dev, "Failed to sync IRQ masks\n");

	mutex_unlock(&tps->irq_lock);
	}

	static inline const struct tps65217_irq *
	irq_to_tps65217_irq(struct tps65217 tps, struct irq_data data)
	{
	return &tps65217_irqs[data->hwirq];
	}

	static void tps65217_irq_enable(struct irq_data *data)
	{
	struct tps65217 *tps = irq_data_get_irq_chip_data(data);
	const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);

	tps->irq_mask &= ~irq_data->mask;
	}

	static void tps65217_irq_disable(struct irq_data *data)
	{
	struct tps65217 *tps = irq_data_get_irq_chip_data(data);
	const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);

	tps->irq_mask \|= irq_data->mask;
	}

	static struct irq_chip tps65217_irq_chip = {
	.irq_bus_lock = tps65217_irq_lock,
	.irq_bus_sync_unlock = tps65217_irq_sync_unlock,
	.irq_enable = tps65217_irq_enable,
	.irq_disable = tps65217_irq_disable,
	};

	static struct mfd_cell tps65217s[] = {
	{
	.name = "tps65217-pmic",
	.of_compatible = "ti,tps65217-pmic",
	},
	{
	.name = "tps65217-bl",
	.of_compatible = "ti,tps65217-bl",
	},
	{
	.name = "tps65217-charger",
	.num_resources = ARRAY_SIZE(charger_resources),
	.resources = charger_resources,
	.of_compatible = "ti,tps65217-charger",
	},
	{
	.name = "tps65217-pwrbutton",
	.num_resources = ARRAY_SIZE(pb_resources),
	.resources = pb_resources,
	.of_compatible = "ti,tps65217-pwrbutton",
	},
	};

	static irqreturn_t tps65217_irq_thread(int irq, void *data)
	{
	struct tps65217 *tps = data;
	unsigned int status;
	bool handled = false;
	int i;
	int ret;

	ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status);
	if (ret < 0) {
	dev_err(tps->dev, "Failed to read IRQ status: %d\n",
	ret);
	return IRQ_NONE;
	}

	for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
	if (status & tps65217_irqs[i].interrupt) {
	handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
	handled = true;
	}
	}

	if (handled)
	return IRQ_HANDLED;

	return IRQ_NONE;
	}

	static int tps65217_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	struct tps65217 *tps = h->host_data;

	irq_set_chip_data(virq, tps);
	irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq);
	irq_set_nested_thread(virq, 1);
	irq_set_parent(virq, tps->irq);
	irq_set_noprobe(virq);

	return 0;
	}

	static const struct irq_domain_ops tps65217_irq_domain_ops = {
	.map = tps65217_irq_map,
	};

	static int tps65217_irq_init(struct tps65217 *tps, int irq)
	{
	int ret;

	mutex_init(&tps->irq_lock);
	tps->irq = irq;

	/* Mask all interrupt sources */
	tps->irq_mask = (TPS65217_INT_RESERVEDM \| TPS65217_INT_PBM
	\| TPS65217_INT_ACM \| TPS65217_INT_USBM);
	tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
	TPS65217_PROTECT_NONE);

	tps->irq_domain = irq_domain_add_linear(tps->dev->of_node,
	TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps);
	if (!tps->irq_domain) {
	dev_err(tps->dev, "Could not create IRQ domain\n");
	return -ENOMEM;
	}

	ret = devm_request_threaded_irq(tps->dev, irq, NULL,
	tps65217_irq_thread, IRQF_ONESHOT,
	"tps65217-irq", tps);
	if (ret) {
	dev_err(tps->dev, "Failed to request IRQ %d: %d\n",
	irq, ret);
	return ret;
	}

	return 0;
	}

	/**
	* tps65217_reg_read: Read a single tps65217 register.
	*
	* @tps: Device to read from.
	* @reg: Register to read.
	* @val: Contians the value
	*/
	int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
	unsigned int *val)
	{
	return regmap_read(tps->regmap, reg, val);
	}
	EXPORT_SYMBOL_GPL(tps65217_reg_read);

	/**
	* tps65217_reg_write: Write a single tps65217 register.
	*
	* @tps65217: Device to write to.
	* @reg: Register to write to.
	* @val: Value to write.
	* @level: Password protected level
	*/
	int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
	unsigned int val, unsigned int level)
	{
	int ret;
	unsigned int xor_reg_val;

	switch (level) {
	case TPS65217_PROTECT_NONE:
	return regmap_write(tps->regmap, reg, val);
	case TPS65217_PROTECT_L1:
	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	xor_reg_val);
	if (ret < 0)
	return ret;

	return regmap_write(tps->regmap, reg, val);
	case TPS65217_PROTECT_L2:
	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	xor_reg_val);
	if (ret < 0)
	return ret;
	ret = regmap_write(tps->regmap, reg, val);
	if (ret < 0)
	return ret;
	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	xor_reg_val);
	if (ret < 0)
	return ret;
	return regmap_write(tps->regmap, reg, val);
	default:
	return -EINVAL;
	}
	}
	EXPORT_SYMBOL_GPL(tps65217_reg_write);

	/**
	* tps65217_update_bits: Modify bits w.r.t mask, val and level.
	*
	* @tps65217: Device to write to.
	* @reg: Register to read-write to.
	* @mask: Mask.
	* @val: Value to write.
	* @level: Password protected level
	*/
	static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
	unsigned int mask, unsigned int val, unsigned int level)
	{
	int ret;
	unsigned int data;

	ret = tps65217_reg_read(tps, reg, &data);
	if (ret) {
	dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
	return ret;
	}

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

	ret = tps65217_reg_write(tps, reg, data, level);
	if (ret)
	dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);

	return ret;
	}

	int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
	unsigned int mask, unsigned int val, unsigned int level)
	{
	return tps65217_update_bits(tps, reg, mask, val, level);
	}
	EXPORT_SYMBOL_GPL(tps65217_set_bits);

	int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
	unsigned int mask, unsigned int level)
	{
	return tps65217_update_bits(tps, reg, mask, 0, level);
	}
	EXPORT_SYMBOL_GPL(tps65217_clear_bits);

	static bool tps65217_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case TPS65217_REG_INT:
	return true;
	default:
	return false;
	}
	}

	static const struct regmap_config tps65217_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = TPS65217_REG_MAX,
	.volatile_reg = tps65217_volatile_reg,
	};

	static const struct of_device_id tps65217_of_match[] = {
	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	{ /* sentinel */ },
	};
	MODULE_DEVICE_TABLE(of, tps65217_of_match);

	static int tps65217_probe(struct i2c_client *client,
	const struct i2c_device_id *ids)
	{
	struct tps65217 *tps;
	unsigned int version;
	unsigned long chip_id = ids->driver_data;
	const struct of_device_id *match;
	bool status_off = false;
	int ret;

	if (client->dev.of_node) {
	match = of_match_device(tps65217_of_match, &client->dev);
	if (!match) {
	dev_err(&client->dev,
	"Failed to find matching dt id\n");
	return -EINVAL;
	}
	chip_id = (unsigned long)match->data;
	status_off = of_property_read_bool(client->dev.of_node,
	"ti,pmic-shutdown-controller");
	}

	if (!chip_id) {
	dev_err(&client->dev, "id is null.\n");
	return -ENODEV;
	}

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

	i2c_set_clientdata(client, tps);
	tps->dev = &client->dev;
	tps->id = chip_id;

	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
	if (IS_ERR(tps->regmap)) {
	ret = PTR_ERR(tps->regmap);
	dev_err(tps->dev, "Failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	if (client->irq) {
	tps65217_irq_init(tps, client->irq);
	} else {
	int i;

	/* Don't tell children about IRQ resources which won't fire */
	for (i = 0; i < ARRAY_SIZE(tps65217s); i++)
	tps65217s[i].num_resources = 0;
	}

	ret = devm_mfd_add_devices(tps->dev, -1, tps65217s,
	ARRAY_SIZE(tps65217s), NULL, 0,
	tps->irq_domain);
	if (ret < 0) {
	dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
	return ret;
	}

	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	if (ret < 0) {
	dev_err(tps->dev, "Failed to read revision register: %d\n",
	ret);
	return ret;
	}

	/* Set the PMIC to shutdown on PWR_EN toggle */
	if (status_off) {
	ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
	TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
	TPS65217_PROTECT_NONE);
	if (ret)
	dev_warn(tps->dev, "unable to set the status OFF\n");
	}

	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
	(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
	version & TPS65217_CHIPID_REV_MASK);

	return 0;
	}

	static const struct i2c_device_id tps65217_id_table[] = {
	{"tps65217", TPS65217},
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(i2c, tps65217_id_table);

	static struct i2c_driver tps65217_driver = {
	.driver = {
	.name = "tps65217",
	.of_match_table = tps65217_of_match,
	},
	.id_table = tps65217_id_table,
	.probe = tps65217_probe,
	};

	static int __init tps65217_init(void)
	{
	return i2c_add_driver(&tps65217_driver);
	}
	subsys_initcall(tps65217_init);

	static void __exit tps65217_exit(void)
	{
	i2c_del_driver(&tps65217_driver);
	}
	module_exit(tps65217_exit);

	MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
	MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
	MODULE_LICENSE("GPL v2");