drivers/regulator/tps65132-regulator.c - kernel/msm.git - Git at Google

 /* Copyright (c) 2014, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #define pr_fmt(fmt) "%s: " fmt, __func__

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/of_device.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/regmap.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/bitops.h>
 #include <linux/types.h>

 struct tps65132_regulator {
 	struct regulator_init_data	*init_data;
 	struct regulator_dev		*rdev;
 	struct device_node		*node;
 	struct regulator_desc		rdesc;
 	struct tps65132_chip		*chip;
 	const char			*name;
 	u8				vol_reg;
 	u8				dischg_bit_pos;
 	bool				dischg_en;
 	u8				ctrl_reg;
 	u8				wrt_en_bit_pos;
 	u8				read_eeprom_bit_pos;
 	int				en_gpio;
 	enum				of_gpio_flags gpio_flags;
 	bool				is_enabled;
 	int				curr_uV;
 	u8				vol_set_val;
 	bool				vol_set_postpone;
 };

 struct tps65132_chip {
 	struct tps65132_regulator	*vreg;
 	struct regulator		*i2c_pwr;
 	struct regmap			*regmap;
 	struct device			*dev;
 	u8				num_regulators;
 	u8				apps_cfg;
 	u8				apps_dischg_reg;
 	u8				apps_cfg_bit_pos;
 	u8				apps_dischg_val;
 	bool				apps_dischg_cfg_postpone;
 	bool				en_gpio_lpm;
 };

 #define TPS65132_REG_VPOS		0x00
 #define TPS65132_REG_VNEG		0x01
 #define TPS65132_VOLTAGE_MASK		0x1f
 #define TPS65132_REG_APPS_DISCHARGE	0x03
 #define TPS65132_DISCHARGE_NEG_BIT	0
 #define TPS65132_DISCHARGE_POS_BIT	1
 #define TPS65132_APPSCFG_BIT		6
 #define TPS65132_REG_CTRL		0xff
 #define TPS65132_WRITE_EN_BIT		7

 #define TPS65132_VOLTAGE_MIN	4000000
 #define TPS65132_VOLTAGE_MAX	6000000
 #define TPS65132_VOLTAGE_STEP	100000
 #define TPS65132_VOLTAGE_LEVELS	\
 	((TPS65132_VOLTAGE_MAX - TPS65132_VOLTAGE_MIN) \
 	 / TPS65132_VOLTAGE_STEP + 1)
 #define TPS65132_CTRL_READ_DAC		0
 #define TPS65132_CTRL_READ_EEPROM	1

 #define TPS65132_NEG_TABLET_CURR_LIMIT_UA	80000
 #define TPS65132_NEG_SMARTPHONE_CURR_LIMIT_UA	40000
 #define TPS65132_POS_CURR_LIMIT_UA		200000

 #define I2C_VOLTAGE_LEVEL	1800000

 enum {
 	TPS65132_POSITIVE_BOOST = 0,
 	TPS65132_NEGATIVE_BOOST,
 };

 static struct of_regulator_match tps65132_reg_matches[] = {
 	{ .name = "pos-boost", .driver_data = (void *)TPS65132_POSITIVE_BOOST },
 	{ .name = "neg-boost", .driver_data = (void *)TPS65132_NEGATIVE_BOOST },
 };

 static int tps65132_regulator_disable(struct regulator_dev *rdev)
 {
 	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
 	struct tps65132_chip *chip = vreg->chip;

 	if (chip->en_gpio_lpm)
 		gpio_direction_input(vreg->en_gpio);
 	else
 		gpio_set_value_cansleep(vreg->en_gpio,
 			vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 1 : 0);

 	vreg->is_enabled = false;

 	return 0;
 }

 static int tps65132_regulator_enable(struct regulator_dev *rdev)
 {
 	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
 	struct tps65132_chip *chip = vreg->chip;
 	int rc;

 	if (chip->en_gpio_lpm)
 		gpio_direction_output(vreg->en_gpio,
 			vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 0 : 1);
 	else
 		gpio_set_value_cansleep(vreg->en_gpio,
 			vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 0 : 1);
 	vreg->is_enabled = true;

 	if (chip->apps_dischg_cfg_postpone) {
 		rc = regmap_write(chip->regmap, chip->apps_dischg_reg,
 						chip->apps_dischg_val);
 		if (rc) {
 			pr_err("apps_dischg set failed, rc = %d\n", rc);
 			return rc;
 		}
 		chip->apps_dischg_cfg_postpone = false;
 	}

 	if (vreg->vol_set_postpone) {
 		rc = regmap_write(rdev->regmap, vreg->vol_reg,
 					vreg->vol_set_val);

 		if (rc) {
 			pr_err("set voltage failed, rc = %d\n", rc);
 			return rc;
 		}
 		vreg->vol_set_postpone = false;
 	}

 	return 0;
 }

 static int tps65132_regulator_get_voltage(struct regulator_dev *rdev)
 {
 	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
 	int rc, val;

 	if (!rdev->regmap) {
 		pr_err("regmap not found\n");
 		return -EINVAL;
 	}
 	if (!vreg->is_enabled)
 		return vreg->curr_uV;

 	rc = regmap_write(rdev->regmap, vreg->ctrl_reg, TPS65132_CTRL_READ_DAC);
 	if (rc) {
 		pr_err("failed to write reg %d, rc = %d\n", vreg->ctrl_reg, rc);
 		return rc;
 	}

 	rc = regmap_read(rdev->regmap, vreg->vol_reg, &val);
 	if (rc) {
 		pr_err("read reg %d failed, rc = %d\n", vreg->vol_reg, rc);
 		return rc;
 	} else {
 		vreg->curr_uV = (val & TPS65132_VOLTAGE_MASK) *
 			TPS65132_VOLTAGE_STEP + TPS65132_VOLTAGE_MIN;
 	}

 	return vreg->curr_uV;
 }

 static int tps65132_regulator_set_voltage(struct regulator_dev *rdev,
 		int min_uV, int max_uV, unsigned *selector)
 {
 	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
 	int val, new_uV, rc;

 	if (!rdev->regmap) {
 		pr_err("regmap not found\n");
 		return -EINVAL;
 	}

 	val = DIV_ROUND_UP(min_uV - TPS65132_VOLTAGE_MIN,
 				TPS65132_VOLTAGE_STEP);
 	val = val & TPS65132_VOLTAGE_MASK;
 	new_uV = TPS65132_VOLTAGE_MIN + (val * TPS65132_VOLTAGE_STEP);
 	if (new_uV > max_uV) {
 		pr_err("failed to set voltage (%d %d)\n", min_uV, max_uV);
 		return -EINVAL;
 	}
 	if (!vreg->is_enabled) {
 		vreg->vol_set_val = val;
 		vreg->vol_set_postpone = true;
 	} else {
 		rc = regmap_write(rdev->regmap, vreg->vol_reg, val);
 		if (rc) {
 			pr_err("failed to write reg %d, rc = %d\n",
 						vreg->vol_reg, rc);
 			return rc;
 		}
 	}
 	vreg->curr_uV = new_uV;

 	*selector = val;

 	return 0;
 }

 static int tps65132_regulator_list_voltage(struct regulator_dev *rdev,
 							unsigned selector)
 {
 	if (selector >= TPS65132_VOLTAGE_LEVELS)
 		return 0;

 	return selector * TPS65132_VOLTAGE_STEP + TPS65132_VOLTAGE_MIN;
 }

 static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
 {
 	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);

 	return vreg->is_enabled ? 1 : 0;
 }

 static struct regulator_ops tps65132_ops = {
 	.set_voltage = tps65132_regulator_set_voltage,
 	.get_voltage = tps65132_regulator_get_voltage,
 	.list_voltage = tps65132_regulator_list_voltage,
 	.enable = tps65132_regulator_enable,
 	.disable = tps65132_regulator_disable,
 	.is_enabled = tps65132_regulator_is_enabled,
 };

 static int tps65132_regulator_gpio_init(struct tps65132_chip *chip)
 {
 	struct tps65132_regulator *vreg;
 	u32 gpio;
 	enum of_gpio_flags flags;
 	int state;
 	int i, rc = 0;

 	for (i = 0; i < chip->num_regulators; i++) {
 		vreg = &chip->vreg[i];
 		gpio = vreg->en_gpio;
 		flags = vreg->gpio_flags;
 		if (gpio_is_valid(gpio)) {
 			rc = devm_gpio_request(chip->dev, gpio, vreg->name);
 			if (rc < 0) {
 				pr_err("gpio %d request failed, rc = %d\n",
 								gpio, rc);
 				return rc;
 			}
 			state = gpio_get_value_cansleep(gpio);
 			if (state < 0) {
 				pr_err("gpio %d: get value failed, rc = %d\n",
 						gpio, state);
 				return state;
 			}
 			rc = gpio_direction_output(gpio, state);
 			if (rc < 0) {
 				pr_err("gpio %d set output failed, rc = %d\n",
 								gpio, rc);
 				return rc;
 			}
 			if (((flags & OF_GPIO_ACTIVE_LOW) && (state == 0)) ||
 				(!(flags & OF_GPIO_ACTIVE_LOW) && (state == 1)))
 				vreg->is_enabled = true;
 		} else {
 			pr_err("gpio %d is invalid for %s EN-pin\n",
 						gpio, vreg->name);
 			return -EINVAL;
 		}
 	}

 	return rc;
 }

 static int tps65132_regulator_apps_dischg_config(struct tps65132_chip *chip)
 {
 	struct tps65132_regulator *vreg;
 	u8 value = 0;
 	bool online = false;
 	int i, rc = 0;

 	if (chip->apps_cfg > 0)
 		value = BIT(chip->apps_cfg_bit_pos);

 	for (i = 0; i < chip->num_regulators; i++) {
 		vreg = &chip->vreg[i];
 		if (vreg->dischg_en)
 			value |= BIT(vreg->dischg_bit_pos);
 		if (vreg->is_enabled)
 			online = true;
 	}
 	if (online) {
 		rc = regmap_write(chip->regmap, chip->apps_dischg_reg, value);
 		if (rc)
 			pr_err("write reg %d failed, rc = %d\n",
 					chip->apps_dischg_reg, rc);
 	} else {
 		chip->apps_dischg_cfg_postpone = true;
 		chip->apps_dischg_val = value;
 	}

 	return 0;
 }

 static int tps65132_regulator_hw_init(struct tps65132_chip *chip)
 {
 	int rc;
 	struct regulator *i2c_pwr = chip->i2c_pwr;

 	rc = tps65132_regulator_gpio_init(chip);
 	if (rc) {
 		pr_err("gpios initialize failed, rc = %d\n", rc);
 		return rc;
 	}

 	if (i2c_pwr) {
 		if (regulator_count_voltages(i2c_pwr) > 0) {
 			rc = regulator_set_voltage(i2c_pwr,
 				I2C_VOLTAGE_LEVEL, I2C_VOLTAGE_LEVEL);
 			if (rc < 0) {
 				pr_err("set i2c-pwr voltage failed, rc = %d\n",
 									rc);
 				return rc;
 			}
 		}
 		rc = regulator_enable(i2c_pwr);
 		if (rc) {
 			pr_err("enable i2c-pwr voltage failed, rc = %d\n", rc);
 			return rc;
 		}
 	}

 	rc = tps65132_regulator_apps_dischg_config(chip);
 	if (rc)
 		pr_err("appscfg set failed, rc = %d\n", rc);

 	return rc;
 }

 static int tps65132_parse_dt(struct tps65132_chip *chip,
 				struct i2c_client *client)
 {
 	struct device_node *node;
 	struct of_regulator_match *match;
 	int type, i, rc;
 	u32 current_limit;

 	if (!client->dev.of_node) {
 		pr_err("device node missing\n");
 		return -EINVAL;
 	}

 	node = of_find_node_by_name(client->dev.of_node, "regulators");
 	if (!node) {
 		pr_err("get regulators node failed\n");
 		return -EINVAL;
 	}

 	rc = of_regulator_match(&client->dev, node, tps65132_reg_matches,
 					ARRAY_SIZE(tps65132_reg_matches));
 	if (rc < 0) {
 		pr_err("regulator match failed, rc = %d\n", rc);
 		return rc;
 	}

 	chip->num_regulators = rc;

 	chip->vreg = devm_kzalloc(&client->dev, chip->num_regulators *
 					sizeof(struct tps65132_regulator),
 					GFP_KERNEL);
 	if (!chip->vreg) {
 		pr_err("memory allocation failed for vreg\n");
 		return -ENOMEM;
 	}
 	if (of_find_property(client->dev.of_node, "i2c-pwr-supply", NULL)) {
 		chip->i2c_pwr = devm_regulator_get(&client->dev, "i2c-pwr");
 		if (IS_ERR_OR_NULL(chip->i2c_pwr)) {
 			rc = PTR_RET(chip->i2c_pwr);
 			if (rc != EPROBE_DEFER)
 				pr_err("get i2c_pwr failed, rc = %d\n", rc);
 			return rc;
 		}
 	}
 	chip->en_gpio_lpm = of_property_read_bool(client->dev.of_node,
 						"ti,en-gpio-lpm");

 	for (i = 0; i < chip->num_regulators; i++) {
 		match = &tps65132_reg_matches[i];
 		if (!match->init_data)
 			continue;
 		match->init_data->constraints.input_uV =
 				match->init_data->constraints.max_uV;
 		match->init_data->constraints.valid_ops_mask =
 					REGULATOR_CHANGE_VOLTAGE |
 					REGULATOR_CHANGE_STATUS;

 		chip->vreg[i].init_data = match->init_data;
 		chip->vreg[i].node = match->of_node;
 		chip->vreg[i].chip = chip;
 		chip->vreg[i].name = match->init_data->constraints.name;
 		chip->vreg[i].ctrl_reg = TPS65132_REG_CTRL;
 		chip->vreg[i].wrt_en_bit_pos = TPS65132_WRITE_EN_BIT;
 		chip->vreg[i].read_eeprom_bit_pos =
 						TPS65132_WRITE_EN_BIT;
 		chip->vreg[i].dischg_en = of_property_read_bool(
 					match->of_node, "ti,discharge-enable");
 		rc = of_property_read_u32(match->of_node, "ti,enable-time",
 					&chip->vreg[i].rdesc.enable_time);
 		if (rc < 0) {
 			pr_debug("ti,enable-time read failed, rc = %d\n", rc);
 			chip->vreg[i].rdesc.enable_time = 800;
 		}
 		rc = of_property_read_u32(match->of_node, "ti,current-limit",
 							&current_limit);
 		type = (uintptr_t)match->driver_data;
 		if (type == TPS65132_POSITIVE_BOOST) {
 			chip->vreg[i].vol_reg = TPS65132_REG_VPOS;
 			chip->vreg[i].dischg_bit_pos =
 					TPS65132_DISCHARGE_POS_BIT;
 			if (!rc && (current_limit !=
 					TPS65132_POS_CURR_LIMIT_UA)) {
 				pr_err("current limit %duA is invalid for postive boost\n",
 							current_limit);
 				return -EINVAL;
 			}
 		} else if (type == TPS65132_NEGATIVE_BOOST) {
 			chip->vreg[i].vol_reg = TPS65132_REG_VNEG;
 			chip->vreg[i].dischg_bit_pos =
 					TPS65132_DISCHARGE_NEG_BIT;
 			if (!rc && (current_limit !=
 				TPS65132_NEG_TABLET_CURR_LIMIT_UA) &&
 				(current_limit !=
 				 TPS65132_NEG_SMARTPHONE_CURR_LIMIT_UA)) {
 				pr_err("current limit %duA is invalid for negative boost\n",
 							current_limit);
 				return -EINVAL;
 			} else if (!rc && (current_limit ==
 					TPS65132_NEG_TABLET_CURR_LIMIT_UA)) {
 				chip->apps_cfg = 1;
 			}
 		} else {
 			pr_err("unknown regulator type: %d\n", type);
 			return -EINVAL;
 		}
 		rc = 0;
 		chip->vreg[i].en_gpio = of_get_named_gpio_flags(
 					match->of_node, "ti,en-gpio", 0,
 					&chip->vreg[i].gpio_flags);
 		if (chip->vreg[i].en_gpio < 0) {
 			pr_err("get ti,en-gpio failed, rc = %d\n",
 					chip->vreg[i].en_gpio);
 			return chip->vreg[i].en_gpio;
 		}
 	}
 	chip->apps_dischg_reg = TPS65132_REG_APPS_DISCHARGE;
 	chip->apps_cfg_bit_pos = TPS65132_APPSCFG_BIT;

 	return rc;
 }

 static struct regmap_config tps65132_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int tps65132_regulator_probe(struct i2c_client *client,
 				const struct i2c_device_id *id)
 {
 	struct tps65132_chip *chip;
 	struct regulator_config config = {};
 	struct regulator_desc *rdesc;
 	int i, j, rc;

 	chip = devm_kzalloc(&client->dev, sizeof(struct tps65132_chip),
 							GFP_KERNEL);
 	if (!chip) {
 		pr_err("memory allocation failed for tps65132_chip\n");
 		return -ENOMEM;
 	}
 	rc = tps65132_parse_dt(chip, client);
 	if (rc) {
 		pr_err("parse device tree failed for tps65132, rc = %d\n",
 								rc);
 		return rc;
 	}
 	chip->regmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
 	if (IS_ERR(chip->regmap)) {
 		pr_err("init regmap failed for tps65132, rc = %ld\n",
 						PTR_ERR(chip->regmap));
 		return PTR_ERR(chip->regmap);
 	}
 	chip->dev = &client->dev;

 	rc = tps65132_regulator_hw_init(chip);
 	if (rc < 0) {
 		pr_err("hardware init failed for tps65132, rc = %d\n", rc);
 		return rc;
 	}
 	i2c_set_clientdata(client, chip);

 	for (i = 0; i < chip->num_regulators; i++) {
 		config.dev = &client->dev;
 		config.init_data = chip->vreg[i].init_data;
 		config.regmap = chip->regmap;
 		config.driver_data = &chip->vreg[i];
 		config.of_node = chip->vreg[i].node;

 		rdesc = &chip->vreg[i].rdesc;
 		rdesc->name = chip->vreg[i].name;
 		rdesc->type = REGULATOR_VOLTAGE;
 		rdesc->owner = THIS_MODULE;
 		rdesc->n_voltages = TPS65132_VOLTAGE_LEVELS;
 		if (of_get_property(client->dev.of_node, "vin-supply", NULL))
 			rdesc->supply_name = "vin";
 		rdesc->ops = &tps65132_ops;
 		chip->vreg[i].rdev = regulator_register(rdesc, &config);
 		if (IS_ERR(chip->vreg[i].rdev)) {
 			pr_err("regulator register failed, rc = %ld\n",
 					PTR_ERR(chip->vreg[i].rdev));
 			for (j = i - 1; j >= 0; j--)
 				regulator_unregister(chip->vreg[j].rdev);

 			return PTR_ERR(chip->vreg[i].rdev);
 		}
 	}

 	return 0;
 }

 static int tps65132_regulator_remove(struct i2c_client *client)
 {
 	struct tps65132_chip *chip = i2c_get_clientdata(client);
 	struct regulator *i2c_pwr = chip->i2c_pwr;
 	int i;

 	if (i2c_pwr)
 		regulator_disable(i2c_pwr);

 	for (i = 0; i < chip->num_regulators; i++)
 		regulator_unregister(chip->vreg[i].rdev);

 	return 0;
 }

 static struct of_device_id tps65132_match_table[] = {
 	{ .compatible = "ti,tps65132", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, tps65132_match_table);

 static const struct i2c_device_id tps65132_id[] = {
 	{"tps65132", -1},
 	{ },
 };

 static int tps65132_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct tps65132_chip *chip = i2c_get_clientdata(client);
 	int rc = 0;

 	if (chip->i2c_pwr)
 		rc = regulator_disable(chip->i2c_pwr);

 	return rc;
 }

 static int tps65132_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct tps65132_chip *chip = i2c_get_clientdata(client);
 	int rc = 0;

 	if (chip->i2c_pwr)
 		rc = regulator_enable(chip->i2c_pwr);

 	return rc;
 }

 static const struct dev_pm_ops tps65132_pm_ops = {
 	.resume = tps65132_resume,
 	.suspend = tps65132_suspend,
 };

 static struct i2c_driver tps65132_regulator_driver = {
 	.driver = {
 		.name		= "tps65132",
 		.owner		= THIS_MODULE,
 		.of_match_table	= tps65132_match_table,
 		.pm		= &tps65132_pm_ops,
 	},
 	.probe = tps65132_regulator_probe,
 	.remove = tps65132_regulator_remove,
 	.id_table = tps65132_id,
 };

 static int __init tps65132_init(void)
 {
 	return i2c_add_driver(&tps65132_regulator_driver);
 }
 subsys_initcall(tps65132_init);

 static void __exit tps65132_exit(void)
 {
 	i2c_del_driver(&tps65132_regulator_driver);
 }
 module_exit(tps65132_exit);

 MODULE_DESCRIPTION("TI TPS65132 regulator driver");
 MODULE_LICENSE("GPL v2");
	/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#define pr_fmt(fmt) "%s: " fmt, __func__

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/of_device.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/regmap.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/bitops.h>
	#include <linux/types.h>

	struct tps65132_regulator {
	struct regulator_init_data *init_data;
	struct regulator_dev *rdev;
	struct device_node *node;
	struct regulator_desc rdesc;
	struct tps65132_chip *chip;
	const char *name;
	u8 vol_reg;
	u8 dischg_bit_pos;
	bool dischg_en;
	u8 ctrl_reg;
	u8 wrt_en_bit_pos;
	u8 read_eeprom_bit_pos;
	int en_gpio;
	enum of_gpio_flags gpio_flags;
	bool is_enabled;
	int curr_uV;
	u8 vol_set_val;
	bool vol_set_postpone;
	};

	struct tps65132_chip {
	struct tps65132_regulator *vreg;
	struct regulator *i2c_pwr;
	struct regmap *regmap;
	struct device *dev;
	u8 num_regulators;
	u8 apps_cfg;
	u8 apps_dischg_reg;
	u8 apps_cfg_bit_pos;
	u8 apps_dischg_val;
	bool apps_dischg_cfg_postpone;
	bool en_gpio_lpm;
	};

	#define TPS65132_REG_VPOS 0x00
	#define TPS65132_REG_VNEG 0x01
	#define TPS65132_VOLTAGE_MASK 0x1f
	#define TPS65132_REG_APPS_DISCHARGE 0x03
	#define TPS65132_DISCHARGE_NEG_BIT 0
	#define TPS65132_DISCHARGE_POS_BIT 1
	#define TPS65132_APPSCFG_BIT 6
	#define TPS65132_REG_CTRL 0xff
	#define TPS65132_WRITE_EN_BIT 7

	#define TPS65132_VOLTAGE_MIN 4000000
	#define TPS65132_VOLTAGE_MAX 6000000
	#define TPS65132_VOLTAGE_STEP 100000
	#define TPS65132_VOLTAGE_LEVELS \
	((TPS65132_VOLTAGE_MAX - TPS65132_VOLTAGE_MIN) \
	/ TPS65132_VOLTAGE_STEP + 1)
	#define TPS65132_CTRL_READ_DAC 0
	#define TPS65132_CTRL_READ_EEPROM 1

	#define TPS65132_NEG_TABLET_CURR_LIMIT_UA 80000
	#define TPS65132_NEG_SMARTPHONE_CURR_LIMIT_UA 40000
	#define TPS65132_POS_CURR_LIMIT_UA 200000

	#define I2C_VOLTAGE_LEVEL 1800000

	enum {
	TPS65132_POSITIVE_BOOST = 0,
	TPS65132_NEGATIVE_BOOST,
	};

	static struct of_regulator_match tps65132_reg_matches[] = {
	{ .name = "pos-boost", .driver_data = (void *)TPS65132_POSITIVE_BOOST },
	{ .name = "neg-boost", .driver_data = (void *)TPS65132_NEGATIVE_BOOST },
	};

	static int tps65132_regulator_disable(struct regulator_dev *rdev)
	{
	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
	struct tps65132_chip *chip = vreg->chip;

	if (chip->en_gpio_lpm)
	gpio_direction_input(vreg->en_gpio);
	else
	gpio_set_value_cansleep(vreg->en_gpio,
	vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 1 : 0);

	vreg->is_enabled = false;

	return 0;
	}

	static int tps65132_regulator_enable(struct regulator_dev *rdev)
	{
	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
	struct tps65132_chip *chip = vreg->chip;
	int rc;

	if (chip->en_gpio_lpm)
	gpio_direction_output(vreg->en_gpio,
	vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 0 : 1);
	else
	gpio_set_value_cansleep(vreg->en_gpio,
	vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 0 : 1);
	vreg->is_enabled = true;

	if (chip->apps_dischg_cfg_postpone) {
	rc = regmap_write(chip->regmap, chip->apps_dischg_reg,
	chip->apps_dischg_val);
	if (rc) {
	pr_err("apps_dischg set failed, rc = %d\n", rc);
	return rc;
	}
	chip->apps_dischg_cfg_postpone = false;
	}

	if (vreg->vol_set_postpone) {
	rc = regmap_write(rdev->regmap, vreg->vol_reg,
	vreg->vol_set_val);

	if (rc) {
	pr_err("set voltage failed, rc = %d\n", rc);
	return rc;
	}
	vreg->vol_set_postpone = false;
	}

	return 0;
	}

	static int tps65132_regulator_get_voltage(struct regulator_dev *rdev)
	{
	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
	int rc, val;

	if (!rdev->regmap) {
	pr_err("regmap not found\n");
	return -EINVAL;
	}
	if (!vreg->is_enabled)
	return vreg->curr_uV;

	rc = regmap_write(rdev->regmap, vreg->ctrl_reg, TPS65132_CTRL_READ_DAC);
	if (rc) {
	pr_err("failed to write reg %d, rc = %d\n", vreg->ctrl_reg, rc);
	return rc;
	}

	rc = regmap_read(rdev->regmap, vreg->vol_reg, &val);
	if (rc) {
	pr_err("read reg %d failed, rc = %d\n", vreg->vol_reg, rc);
	return rc;
	} else {
	vreg->curr_uV = (val & TPS65132_VOLTAGE_MASK) *
	TPS65132_VOLTAGE_STEP + TPS65132_VOLTAGE_MIN;
	}

	return vreg->curr_uV;
	}

	static int tps65132_regulator_set_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV, unsigned *selector)
	{
	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
	int val, new_uV, rc;

	if (!rdev->regmap) {
	pr_err("regmap not found\n");
	return -EINVAL;
	}

	val = DIV_ROUND_UP(min_uV - TPS65132_VOLTAGE_MIN,
	TPS65132_VOLTAGE_STEP);
	val = val & TPS65132_VOLTAGE_MASK;
	new_uV = TPS65132_VOLTAGE_MIN + (val * TPS65132_VOLTAGE_STEP);
	if (new_uV > max_uV) {
	pr_err("failed to set voltage (%d %d)\n", min_uV, max_uV);
	return -EINVAL;
	}
	if (!vreg->is_enabled) {
	vreg->vol_set_val = val;
	vreg->vol_set_postpone = true;
	} else {
	rc = regmap_write(rdev->regmap, vreg->vol_reg, val);
	if (rc) {
	pr_err("failed to write reg %d, rc = %d\n",
	vreg->vol_reg, rc);
	return rc;
	}
	}
	vreg->curr_uV = new_uV;

	*selector = val;

	return 0;
	}

	static int tps65132_regulator_list_voltage(struct regulator_dev *rdev,
	unsigned selector)
	{
	if (selector >= TPS65132_VOLTAGE_LEVELS)
	return 0;

	return selector * TPS65132_VOLTAGE_STEP + TPS65132_VOLTAGE_MIN;
	}

	static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
	{
	struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);

	return vreg->is_enabled ? 1 : 0;
	}

	static struct regulator_ops tps65132_ops = {
	.set_voltage = tps65132_regulator_set_voltage,
	.get_voltage = tps65132_regulator_get_voltage,
	.list_voltage = tps65132_regulator_list_voltage,
	.enable = tps65132_regulator_enable,
	.disable = tps65132_regulator_disable,
	.is_enabled = tps65132_regulator_is_enabled,
	};

	static int tps65132_regulator_gpio_init(struct tps65132_chip *chip)
	{
	struct tps65132_regulator *vreg;
	u32 gpio;
	enum of_gpio_flags flags;
	int state;
	int i, rc = 0;

	for (i = 0; i < chip->num_regulators; i++) {
	vreg = &chip->vreg[i];
	gpio = vreg->en_gpio;
	flags = vreg->gpio_flags;
	if (gpio_is_valid(gpio)) {
	rc = devm_gpio_request(chip->dev, gpio, vreg->name);
	if (rc < 0) {
	pr_err("gpio %d request failed, rc = %d\n",
	gpio, rc);
	return rc;
	}
	state = gpio_get_value_cansleep(gpio);
	if (state < 0) {
	pr_err("gpio %d: get value failed, rc = %d\n",
	gpio, state);
	return state;
	}
	rc = gpio_direction_output(gpio, state);
	if (rc < 0) {
	pr_err("gpio %d set output failed, rc = %d\n",
	gpio, rc);
	return rc;
	}
	if (((flags & OF_GPIO_ACTIVE_LOW) && (state == 0)) \|\|
	(!(flags & OF_GPIO_ACTIVE_LOW) && (state == 1)))
	vreg->is_enabled = true;
	} else {
	pr_err("gpio %d is invalid for %s EN-pin\n",
	gpio, vreg->name);
	return -EINVAL;
	}
	}

	return rc;
	}

	static int tps65132_regulator_apps_dischg_config(struct tps65132_chip *chip)
	{
	struct tps65132_regulator *vreg;
	u8 value = 0;
	bool online = false;
	int i, rc = 0;

	if (chip->apps_cfg > 0)
	value = BIT(chip->apps_cfg_bit_pos);

	for (i = 0; i < chip->num_regulators; i++) {
	vreg = &chip->vreg[i];
	if (vreg->dischg_en)
	value \|= BIT(vreg->dischg_bit_pos);
	if (vreg->is_enabled)
	online = true;
	}
	if (online) {
	rc = regmap_write(chip->regmap, chip->apps_dischg_reg, value);
	if (rc)
	pr_err("write reg %d failed, rc = %d\n",
	chip->apps_dischg_reg, rc);
	} else {
	chip->apps_dischg_cfg_postpone = true;
	chip->apps_dischg_val = value;
	}

	return 0;
	}

	static int tps65132_regulator_hw_init(struct tps65132_chip *chip)
	{
	int rc;
	struct regulator *i2c_pwr = chip->i2c_pwr;

	rc = tps65132_regulator_gpio_init(chip);
	if (rc) {
	pr_err("gpios initialize failed, rc = %d\n", rc);
	return rc;
	}

	if (i2c_pwr) {
	if (regulator_count_voltages(i2c_pwr) > 0) {
	rc = regulator_set_voltage(i2c_pwr,
	I2C_VOLTAGE_LEVEL, I2C_VOLTAGE_LEVEL);
	if (rc < 0) {
	pr_err("set i2c-pwr voltage failed, rc = %d\n",
	rc);
	return rc;
	}
	}
	rc = regulator_enable(i2c_pwr);
	if (rc) {
	pr_err("enable i2c-pwr voltage failed, rc = %d\n", rc);
	return rc;
	}
	}

	rc = tps65132_regulator_apps_dischg_config(chip);
	if (rc)
	pr_err("appscfg set failed, rc = %d\n", rc);

	return rc;
	}

	static int tps65132_parse_dt(struct tps65132_chip *chip,
	struct i2c_client *client)
	{
	struct device_node *node;
	struct of_regulator_match *match;
	int type, i, rc;
	u32 current_limit;

	if (!client->dev.of_node) {
	pr_err("device node missing\n");
	return -EINVAL;
	}

	node = of_find_node_by_name(client->dev.of_node, "regulators");
	if (!node) {
	pr_err("get regulators node failed\n");
	return -EINVAL;
	}

	rc = of_regulator_match(&client->dev, node, tps65132_reg_matches,
	ARRAY_SIZE(tps65132_reg_matches));
	if (rc < 0) {
	pr_err("regulator match failed, rc = %d\n", rc);
	return rc;
	}

	chip->num_regulators = rc;

	chip->vreg = devm_kzalloc(&client->dev, chip->num_regulators *
	sizeof(struct tps65132_regulator),
	GFP_KERNEL);
	if (!chip->vreg) {
	pr_err("memory allocation failed for vreg\n");
	return -ENOMEM;
	}
	if (of_find_property(client->dev.of_node, "i2c-pwr-supply", NULL)) {
	chip->i2c_pwr = devm_regulator_get(&client->dev, "i2c-pwr");
	if (IS_ERR_OR_NULL(chip->i2c_pwr)) {
	rc = PTR_RET(chip->i2c_pwr);
	if (rc != EPROBE_DEFER)
	pr_err("get i2c_pwr failed, rc = %d\n", rc);
	return rc;
	}
	}
	chip->en_gpio_lpm = of_property_read_bool(client->dev.of_node,
	"ti,en-gpio-lpm");

	for (i = 0; i < chip->num_regulators; i++) {
	match = &tps65132_reg_matches[i];
	if (!match->init_data)
	continue;
	match->init_data->constraints.input_uV =
	match->init_data->constraints.max_uV;
	match->init_data->constraints.valid_ops_mask =
	REGULATOR_CHANGE_VOLTAGE \|
	REGULATOR_CHANGE_STATUS;

	chip->vreg[i].init_data = match->init_data;
	chip->vreg[i].node = match->of_node;
	chip->vreg[i].chip = chip;
	chip->vreg[i].name = match->init_data->constraints.name;
	chip->vreg[i].ctrl_reg = TPS65132_REG_CTRL;
	chip->vreg[i].wrt_en_bit_pos = TPS65132_WRITE_EN_BIT;
	chip->vreg[i].read_eeprom_bit_pos =
	TPS65132_WRITE_EN_BIT;
	chip->vreg[i].dischg_en = of_property_read_bool(
	match->of_node, "ti,discharge-enable");
	rc = of_property_read_u32(match->of_node, "ti,enable-time",
	&chip->vreg[i].rdesc.enable_time);
	if (rc < 0) {
	pr_debug("ti,enable-time read failed, rc = %d\n", rc);
	chip->vreg[i].rdesc.enable_time = 800;
	}
	rc = of_property_read_u32(match->of_node, "ti,current-limit",
	&current_limit);
	type = (uintptr_t)match->driver_data;
	if (type == TPS65132_POSITIVE_BOOST) {
	chip->vreg[i].vol_reg = TPS65132_REG_VPOS;
	chip->vreg[i].dischg_bit_pos =
	TPS65132_DISCHARGE_POS_BIT;
	if (!rc && (current_limit !=
	TPS65132_POS_CURR_LIMIT_UA)) {
	pr_err("current limit %duA is invalid for postive boost\n",
	current_limit);
	return -EINVAL;
	}
	} else if (type == TPS65132_NEGATIVE_BOOST) {
	chip->vreg[i].vol_reg = TPS65132_REG_VNEG;
	chip->vreg[i].dischg_bit_pos =
	TPS65132_DISCHARGE_NEG_BIT;
	if (!rc && (current_limit !=
	TPS65132_NEG_TABLET_CURR_LIMIT_UA) &&
	(current_limit !=
	TPS65132_NEG_SMARTPHONE_CURR_LIMIT_UA)) {
	pr_err("current limit %duA is invalid for negative boost\n",
	current_limit);
	return -EINVAL;
	} else if (!rc && (current_limit ==
	TPS65132_NEG_TABLET_CURR_LIMIT_UA)) {
	chip->apps_cfg = 1;
	}
	} else {
	pr_err("unknown regulator type: %d\n", type);
	return -EINVAL;
	}
	rc = 0;
	chip->vreg[i].en_gpio = of_get_named_gpio_flags(
	match->of_node, "ti,en-gpio", 0,
	&chip->vreg[i].gpio_flags);
	if (chip->vreg[i].en_gpio < 0) {
	pr_err("get ti,en-gpio failed, rc = %d\n",
	chip->vreg[i].en_gpio);
	return chip->vreg[i].en_gpio;
	}
	}
	chip->apps_dischg_reg = TPS65132_REG_APPS_DISCHARGE;
	chip->apps_cfg_bit_pos = TPS65132_APPSCFG_BIT;

	return rc;
	}

	static struct regmap_config tps65132_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int tps65132_regulator_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tps65132_chip *chip;
	struct regulator_config config = {};
	struct regulator_desc *rdesc;
	int i, j, rc;

	chip = devm_kzalloc(&client->dev, sizeof(struct tps65132_chip),
	GFP_KERNEL);
	if (!chip) {
	pr_err("memory allocation failed for tps65132_chip\n");
	return -ENOMEM;
	}
	rc = tps65132_parse_dt(chip, client);
	if (rc) {
	pr_err("parse device tree failed for tps65132, rc = %d\n",
	rc);
	return rc;
	}
	chip->regmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
	if (IS_ERR(chip->regmap)) {
	pr_err("init regmap failed for tps65132, rc = %ld\n",
	PTR_ERR(chip->regmap));
	return PTR_ERR(chip->regmap);
	}
	chip->dev = &client->dev;

	rc = tps65132_regulator_hw_init(chip);
	if (rc < 0) {
	pr_err("hardware init failed for tps65132, rc = %d\n", rc);
	return rc;
	}
	i2c_set_clientdata(client, chip);

	for (i = 0; i < chip->num_regulators; i++) {
	config.dev = &client->dev;
	config.init_data = chip->vreg[i].init_data;
	config.regmap = chip->regmap;
	config.driver_data = &chip->vreg[i];
	config.of_node = chip->vreg[i].node;

	rdesc = &chip->vreg[i].rdesc;
	rdesc->name = chip->vreg[i].name;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->owner = THIS_MODULE;
	rdesc->n_voltages = TPS65132_VOLTAGE_LEVELS;
	if (of_get_property(client->dev.of_node, "vin-supply", NULL))
	rdesc->supply_name = "vin";
	rdesc->ops = &tps65132_ops;
	chip->vreg[i].rdev = regulator_register(rdesc, &config);
	if (IS_ERR(chip->vreg[i].rdev)) {
	pr_err("regulator register failed, rc = %ld\n",
	PTR_ERR(chip->vreg[i].rdev));
	for (j = i - 1; j >= 0; j--)
	regulator_unregister(chip->vreg[j].rdev);

	return PTR_ERR(chip->vreg[i].rdev);
	}
	}

	return 0;
	}

	static int tps65132_regulator_remove(struct i2c_client *client)
	{
	struct tps65132_chip *chip = i2c_get_clientdata(client);
	struct regulator *i2c_pwr = chip->i2c_pwr;
	int i;

	if (i2c_pwr)
	regulator_disable(i2c_pwr);

	for (i = 0; i < chip->num_regulators; i++)
	regulator_unregister(chip->vreg[i].rdev);

	return 0;
	}

	static struct of_device_id tps65132_match_table[] = {
	{ .compatible = "ti,tps65132", },
	{},
	};
	MODULE_DEVICE_TABLE(of, tps65132_match_table);

	static const struct i2c_device_id tps65132_id[] = {
	{"tps65132", -1},
	{ },
	};

	static int tps65132_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct tps65132_chip *chip = i2c_get_clientdata(client);
	int rc = 0;

	if (chip->i2c_pwr)
	rc = regulator_disable(chip->i2c_pwr);

	return rc;
	}

	static int tps65132_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct tps65132_chip *chip = i2c_get_clientdata(client);
	int rc = 0;

	if (chip->i2c_pwr)
	rc = regulator_enable(chip->i2c_pwr);

	return rc;
	}

	static const struct dev_pm_ops tps65132_pm_ops = {
	.resume = tps65132_resume,
	.suspend = tps65132_suspend,
	};

	static struct i2c_driver tps65132_regulator_driver = {
	.driver = {
	.name = "tps65132",
	.owner = THIS_MODULE,
	.of_match_table = tps65132_match_table,
	.pm = &tps65132_pm_ops,
	},
	.probe = tps65132_regulator_probe,
	.remove = tps65132_regulator_remove,
	.id_table = tps65132_id,
	};

	static int __init tps65132_init(void)
	{
	return i2c_add_driver(&tps65132_regulator_driver);
	}
	subsys_initcall(tps65132_init);

	static void __exit tps65132_exit(void)
	{
	i2c_del_driver(&tps65132_regulator_driver);
	}
	module_exit(tps65132_exit);

	MODULE_DESCRIPTION("TI TPS65132 regulator driver");
	MODULE_LICENSE("GPL v2");