drivers/regulator/da9055-regulator.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // Regulator driver for DA9055 PMIC
 //
 // Copyright(c) 2012 Dialog Semiconductor Ltd.
 //
 // Author: David Dajun Chen <dchen@diasemi.com>

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/of.h>
 #include <linux/regulator/of_regulator.h>

 #include <linux/mfd/da9055/core.h>
 #include <linux/mfd/da9055/reg.h>
 #include <linux/mfd/da9055/pdata.h>

 #define DA9055_MIN_UA		0
 #define DA9055_MAX_UA		3

 #define DA9055_LDO_MODE_SYNC	0
 #define DA9055_LDO_MODE_SLEEP	1

 #define DA9055_BUCK_MODE_SLEEP	1
 #define DA9055_BUCK_MODE_SYNC	2
 #define DA9055_BUCK_MODE_AUTO	3

 /* DA9055 REGULATOR IDs */
 #define DA9055_ID_BUCK1	0
 #define DA9055_ID_BUCK2	1
 #define DA9055_ID_LDO1		2
 #define DA9055_ID_LDO2		3
 #define DA9055_ID_LDO3		4
 #define DA9055_ID_LDO4		5
 #define DA9055_ID_LDO5		6
 #define DA9055_ID_LDO6		7

 /* DA9055 BUCK current limit */
 static const unsigned int da9055_current_limits[] = {
 	500000, 600000, 700000, 800000
 };

 struct da9055_conf_reg {
 	int reg;
 	int sel_mask;
 	int en_mask;
 };

 struct da9055_volt_reg {
 	int reg_a;
 	int reg_b;
 	int sl_shift;
 	int v_mask;
 };

 struct da9055_mode_reg {
 	int reg;
 	int mask;
 	int shift;
 };

 struct da9055_regulator_info {
 	struct regulator_desc reg_desc;
 	struct da9055_conf_reg conf;
 	struct da9055_volt_reg volt;
 	struct da9055_mode_reg mode;
 };

 struct da9055_regulator {
 	struct da9055 *da9055;
 	struct da9055_regulator_info *info;
 	struct regulator_dev *rdev;
 	enum gpio_select reg_rselect;
 };

 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	int ret, mode = 0;

 	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
 	if (ret < 0)
 		return ret;

 	switch ((ret & info->mode.mask) >> info->mode.shift) {
 	case DA9055_BUCK_MODE_SYNC:
 		mode = REGULATOR_MODE_FAST;
 		break;
 	case DA9055_BUCK_MODE_AUTO:
 		mode = REGULATOR_MODE_NORMAL;
 		break;
 	case DA9055_BUCK_MODE_SLEEP:
 		mode = REGULATOR_MODE_STANDBY;
 		break;
 	}

 	return mode;
 }

 static int da9055_buck_set_mode(struct regulator_dev *rdev,
 					unsigned int mode)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	int val = 0;

 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
 		break;
 	case REGULATOR_MODE_NORMAL:
 		val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
 		break;
 	case REGULATOR_MODE_STANDBY:
 		val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
 		break;
 	}

 	return da9055_reg_update(regulator->da9055, info->mode.reg,
 				 info->mode.mask, val);
 }

 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	int ret;

 	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
 	if (ret < 0)
 		return ret;

 	if (ret >> info->volt.sl_shift)
 		return REGULATOR_MODE_STANDBY;
 	else
 		return REGULATOR_MODE_NORMAL;
 }

 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	struct da9055_volt_reg volt = info->volt;
 	int val = 0;

 	switch (mode) {
 	case REGULATOR_MODE_NORMAL:
 	case REGULATOR_MODE_FAST:
 		val = DA9055_LDO_MODE_SYNC;
 		break;
 	case REGULATOR_MODE_STANDBY:
 		val = DA9055_LDO_MODE_SLEEP;
 		break;
 	}

 	return da9055_reg_update(regulator->da9055, volt.reg_b,
 				 1 << volt.sl_shift,
 				 val << volt.sl_shift);
 }

 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	struct da9055_volt_reg volt = info->volt;
 	int ret, sel;

 	/*
 	 * There are two voltage register set A & B for voltage ramping but
 	 * either one of then can be active therefore we first determine
 	 * the active register set.
 	 */
 	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 	if (ret < 0)
 		return ret;

 	ret &= info->conf.sel_mask;

 	/* Get the voltage for the active register set A/B */
 	if (ret == DA9055_REGUALTOR_SET_A)
 		ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 	else
 		ret = da9055_reg_read(regulator->da9055, volt.reg_b);

 	if (ret < 0)
 		return ret;

 	sel = (ret & volt.v_mask);
 	return sel;
 }

 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 					    unsigned int selector)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	int ret;

 	/*
 	 * Regulator register set A/B is not selected through GPIO therefore
 	 * we use default register set A for voltage ramping.
 	 */
 	if (regulator->reg_rselect == NO_GPIO) {
 		/* Select register set A */
 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 					info->conf.sel_mask, DA9055_SEL_REG_A);
 		if (ret < 0)
 			return ret;

 		/* Set the voltage */
 		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 					 info->volt.v_mask, selector);
 	}

 	/*
 	 * Here regulator register set A/B is selected through GPIO.
 	 * Therefore we first determine the selected register set A/B and
 	 * then set the desired voltage for that register set A/B.
 	 */
 	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 	if (ret < 0)
 		return ret;

 	ret &= info->conf.sel_mask;

 	/* Set the voltage */
 	if (ret == DA9055_REGUALTOR_SET_A)
 		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 					 info->volt.v_mask, selector);
 	else
 		return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 					 info->volt.v_mask, selector);
 }

 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 						int uV)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;
 	int ret;

 	/* Select register set B for suspend voltage ramping. */
 	if (regulator->reg_rselect == NO_GPIO) {
 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 					info->conf.sel_mask, DA9055_SEL_REG_B);
 		if (ret < 0)
 			return ret;
 	}

 	ret = regulator_map_voltage_linear(rdev, uV, uV);
 	if (ret < 0)
 		return ret;

 	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 				 info->volt.v_mask, ret);
 }

 static int da9055_suspend_enable(struct regulator_dev *rdev)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;

 	/* Select register set B for voltage ramping. */
 	if (regulator->reg_rselect == NO_GPIO)
 		return da9055_reg_update(regulator->da9055, info->conf.reg,
 					info->conf.sel_mask, DA9055_SEL_REG_B);
 	else
 		return 0;
 }

 static int da9055_suspend_disable(struct regulator_dev *rdev)
 {
 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9055_regulator_info *info = regulator->info;

 	/* Diselect register set B. */
 	if (regulator->reg_rselect == NO_GPIO)
 		return da9055_reg_update(regulator->da9055, info->conf.reg,
 					info->conf.sel_mask, DA9055_SEL_REG_A);
 	else
 		return 0;
 }

 static const struct regulator_ops da9055_buck_ops = {
 	.get_mode = da9055_buck_get_mode,
 	.set_mode = da9055_buck_set_mode,

 	.get_current_limit = regulator_get_current_limit_regmap,
 	.set_current_limit = regulator_set_current_limit_regmap,

 	.get_voltage_sel = da9055_regulator_get_voltage_sel,
 	.set_voltage_sel = da9055_regulator_set_voltage_sel,
 	.list_voltage = regulator_list_voltage_linear,
 	.map_voltage = regulator_map_voltage_linear,
 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,

 	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 	.set_suspend_enable = da9055_suspend_enable,
 	.set_suspend_disable = da9055_suspend_disable,
 	.set_suspend_mode = da9055_buck_set_mode,
 };

 static const struct regulator_ops da9055_ldo_ops = {
 	.get_mode = da9055_ldo_get_mode,
 	.set_mode = da9055_ldo_set_mode,

 	.get_voltage_sel = da9055_regulator_get_voltage_sel,
 	.set_voltage_sel = da9055_regulator_set_voltage_sel,
 	.list_voltage = regulator_list_voltage_linear,
 	.map_voltage = regulator_map_voltage_linear,
 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,

 	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 	.set_suspend_enable = da9055_suspend_enable,
 	.set_suspend_disable = da9055_suspend_disable,
 	.set_suspend_mode = da9055_ldo_set_mode,

 };

 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 {\
 	.reg_desc = {\
 		.name = #_id,\
 		.of_match = of_match_ptr(#_id),\
 		.regulators_node = of_match_ptr("regulators"),\
 		.ops = &da9055_ldo_ops,\
 		.type = REGULATOR_VOLTAGE,\
 		.id = DA9055_ID_##_id,\
 		.n_voltages = (max - min) / step + 1 + (voffset), \
 		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 		.enable_mask = 1, \
 		.min_uV = (min) * 1000,\
 		.uV_step = (step) * 1000,\
 		.linear_min_sel = (voffset),\
 		.owner = THIS_MODULE,\
 	},\
 	.conf = {\
 		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 		.sel_mask = (1 << 4),\
 		.en_mask = 1,\
 	},\
 	.volt = {\
 		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 		.sl_shift = 7,\
 		.v_mask = (1 << (vbits)) - 1,\
 	},\
 }

 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
 {\
 	.reg_desc = {\
 		.name = #_id,\
 		.of_match = of_match_ptr(#_id),\
 		.regulators_node = of_match_ptr("regulators"),\
 		.ops = &da9055_buck_ops,\
 		.type = REGULATOR_VOLTAGE,\
 		.id = DA9055_ID_##_id,\
 		.n_voltages = (max - min) / step + 1 + (voffset), \
 		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 		.enable_mask = 1,\
 		.min_uV = (min) * 1000,\
 		.uV_step = (step) * 1000,\
 		.linear_min_sel = (voffset),\
 		.owner = THIS_MODULE,\
 		.curr_table = da9055_current_limits,\
 		.n_current_limits = ARRAY_SIZE(da9055_current_limits),\
 		.csel_reg = DA9055_REG_BUCK_LIM,\
 		.csel_mask = (mbits),\
 	},\
 	.conf = {\
 		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 		.sel_mask = (1 << 4),\
 		.en_mask = 1,\
 	},\
 	.volt = {\
 		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 		.sl_shift = 7,\
 		.v_mask = (1 << (vbits)) - 1,\
 	},\
 	.mode = {\
 		.reg = DA9055_REG_BCORE_MODE,\
 		.mask = (mbits),\
 		.shift = (sbits),\
 	},\
 }

 static struct da9055_regulator_info da9055_regulator_info[] = {
 	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
 	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
 	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
 	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
 	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
 	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
 	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
 	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
 };

 /*
  * Configures regulator to be controlled either through GPIO 1 or 2.
  * GPIO can control regulator state and/or select the regulator register
  * set A/B for voltage ramping.
  */
 static int da9055_gpio_init(struct da9055_regulator *regulator,
 			    struct regulator_config *config,
 			    struct da9055_pdata *pdata, int id)
 {
 	struct da9055_regulator_info *info = regulator->info;
 	int ret = 0;

 	if (!pdata)
 		return 0;

 	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 		char name[18];
 		int gpio_mux = pdata->gpio_ren[id];

 		config->ena_gpiod = pdata->ena_gpiods[id];

 		/*
 		 * GPI pin is muxed with regulator to control the
 		 * regulator state.
 		 */
 		sprintf(name, "DA9055 GPI %d", gpio_mux);
 		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 					    name);
 		if (ret < 0)
 			goto err;

 		/*
 		 * Let the regulator know that its state is controlled
 		 * through GPI.
 		 */
 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 					DA9055_E_GPI_MASK,
 					pdata->reg_ren[id]
 					<< DA9055_E_GPI_SHIFT);
 		if (ret < 0)
 			goto err;
 	}

 	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
 		char name[18];
 		int gpio_mux = pdata->gpio_rsel[id];

 		regulator->reg_rselect = pdata->reg_rsel[id];

 		/*
 		 * GPI pin is muxed with regulator to select the
 		 * regulator register set A/B for voltage ramping.
 		 */
 		sprintf(name, "DA9055 GPI %d", gpio_mux);
 		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 					    name);
 		if (ret < 0)
 			goto err;

 		/*
 		 * Let the regulator know that its register set A/B
 		 * will be selected through GPI for voltage ramping.
 		 */
 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 					DA9055_V_GPI_MASK,
 					pdata->reg_rsel[id]
 					<< DA9055_V_GPI_SHIFT);
 	}

 err:
 	return ret;
 }

 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 {
 	struct da9055_regulator *regulator = data;

 	regulator_notifier_call_chain(regulator->rdev,
 				      REGULATOR_EVENT_OVER_CURRENT, NULL);

 	return IRQ_HANDLED;
 }

 static inline struct da9055_regulator_info *find_regulator_info(int id)
 {
 	struct da9055_regulator_info *info;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
 		info = &da9055_regulator_info[i];
 		if (info->reg_desc.id == id)
 			return info;
 	}

 	return NULL;
 }

 static int da9055_regulator_probe(struct platform_device *pdev)
 {
 	struct regulator_config config = { };
 	struct da9055_regulator *regulator;
 	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
 	struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
 	int ret, irq;

 	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
 				 GFP_KERNEL);
 	if (!regulator)
 		return -ENOMEM;

 	regulator->info = find_regulator_info(pdev->id);
 	if (regulator->info == NULL) {
 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
 		return -EINVAL;
 	}

 	regulator->da9055 = da9055;
 	config.dev = da9055->dev;
 	config.driver_data = regulator;
 	config.regmap = da9055->regmap;

 	if (pdata)
 		config.init_data = pdata->regulators[pdev->id];

 	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
 	if (ret < 0)
 		return ret;

 	regulator->rdev = devm_regulator_register(&pdev->dev,
 						  &regulator->info->reg_desc,
 						  &config);
 	if (IS_ERR(regulator->rdev)) {
 		dev_err(&pdev->dev, "Failed to register regulator %s\n",
 			regulator->info->reg_desc.name);
 		return PTR_ERR(regulator->rdev);
 	}

 	/* Only LDO 5 and 6 has got the over current interrupt */
 	if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
 		irq = platform_get_irq_byname(pdev, "REGULATOR");
 		if (irq < 0)
 			return irq;

 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 						da9055_ldo5_6_oc_irq,
 						IRQF_TRIGGER_HIGH |
 						IRQF_ONESHOT |
 						IRQF_PROBE_SHARED,
 						pdev->name, regulator);
 		if (ret != 0) {
 			if (ret != -EBUSY) {
 				dev_err(&pdev->dev,
 				"Failed to request Regulator IRQ %d: %d\n",
 				irq, ret);
 				return ret;
 			}
 		}
 	}

 	platform_set_drvdata(pdev, regulator);

 	return 0;
 }

 static struct platform_driver da9055_regulator_driver = {
 	.probe = da9055_regulator_probe,
 	.driver = {
 		.name = "da9055-regulator",
 	},
 };

 static int __init da9055_regulator_init(void)
 {
 	return platform_driver_register(&da9055_regulator_driver);
 }
 subsys_initcall(da9055_regulator_init);

 static void __exit da9055_regulator_exit(void)
 {
 	platform_driver_unregister(&da9055_regulator_driver);
 }
 module_exit(da9055_regulator_exit);

 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:da9055-regulator");
	// SPDX-License-Identifier: GPL-2.0+
	//
	// Regulator driver for DA9055 PMIC
	//
	// Copyright(c) 2012 Dialog Semiconductor Ltd.
	//
	// Author: David Dajun Chen <dchen@diasemi.com>

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/gpio.h>
	#include <linux/gpio/consumer.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/of.h>
	#include <linux/regulator/of_regulator.h>

	#include <linux/mfd/da9055/core.h>
	#include <linux/mfd/da9055/reg.h>
	#include <linux/mfd/da9055/pdata.h>

	#define DA9055_MIN_UA 0
	#define DA9055_MAX_UA 3

	#define DA9055_LDO_MODE_SYNC 0
	#define DA9055_LDO_MODE_SLEEP 1

	#define DA9055_BUCK_MODE_SLEEP 1
	#define DA9055_BUCK_MODE_SYNC 2
	#define DA9055_BUCK_MODE_AUTO 3

	/* DA9055 REGULATOR IDs */
	#define DA9055_ID_BUCK1 0
	#define DA9055_ID_BUCK2 1
	#define DA9055_ID_LDO1 2
	#define DA9055_ID_LDO2 3
	#define DA9055_ID_LDO3 4
	#define DA9055_ID_LDO4 5
	#define DA9055_ID_LDO5 6
	#define DA9055_ID_LDO6 7

	/* DA9055 BUCK current limit */
	static const unsigned int da9055_current_limits[] = {
	500000, 600000, 700000, 800000
	};

	struct da9055_conf_reg {
	int reg;
	int sel_mask;
	int en_mask;
	};

	struct da9055_volt_reg {
	int reg_a;
	int reg_b;
	int sl_shift;
	int v_mask;
	};

	struct da9055_mode_reg {
	int reg;
	int mask;
	int shift;
	};

	struct da9055_regulator_info {
	struct regulator_desc reg_desc;
	struct da9055_conf_reg conf;
	struct da9055_volt_reg volt;
	struct da9055_mode_reg mode;
	};

	struct da9055_regulator {
	struct da9055 *da9055;
	struct da9055_regulator_info *info;
	struct regulator_dev *rdev;
	enum gpio_select reg_rselect;
	};

	static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret, mode = 0;

	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
	if (ret < 0)
	return ret;

	switch ((ret & info->mode.mask) >> info->mode.shift) {
	case DA9055_BUCK_MODE_SYNC:
	mode = REGULATOR_MODE_FAST;
	break;
	case DA9055_BUCK_MODE_AUTO:
	mode = REGULATOR_MODE_NORMAL;
	break;
	case DA9055_BUCK_MODE_SLEEP:
	mode = REGULATOR_MODE_STANDBY;
	break;
	}

	return mode;
	}

	static int da9055_buck_set_mode(struct regulator_dev *rdev,
	unsigned int mode)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
	val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
	break;
	case REGULATOR_MODE_NORMAL:
	val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
	break;
	case REGULATOR_MODE_STANDBY:
	val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
	break;
	}

	return da9055_reg_update(regulator->da9055, info->mode.reg,
	info->mode.mask, val);
	}

	static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
	if (ret < 0)
	return ret;

	if (ret >> info->volt.sl_shift)
	return REGULATOR_MODE_STANDBY;
	else
	return REGULATOR_MODE_NORMAL;
	}

	static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	struct da9055_volt_reg volt = info->volt;
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
	case REGULATOR_MODE_FAST:
	val = DA9055_LDO_MODE_SYNC;
	break;
	case REGULATOR_MODE_STANDBY:
	val = DA9055_LDO_MODE_SLEEP;
	break;
	}

	return da9055_reg_update(regulator->da9055, volt.reg_b,
	1 << volt.sl_shift,
	val << volt.sl_shift);
	}

	static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	struct da9055_volt_reg volt = info->volt;
	int ret, sel;

	/*
	* There are two voltage register set A & B for voltage ramping but
	* either one of then can be active therefore we first determine
	* the active register set.
	*/
	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
	if (ret < 0)
	return ret;

	ret &= info->conf.sel_mask;

	/* Get the voltage for the active register set A/B */
	if (ret == DA9055_REGUALTOR_SET_A)
	ret = da9055_reg_read(regulator->da9055, volt.reg_a);
	else
	ret = da9055_reg_read(regulator->da9055, volt.reg_b);

	if (ret < 0)
	return ret;

	sel = (ret & volt.v_mask);
	return sel;
	}

	static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
	unsigned int selector)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	/*
	* Regulator register set A/B is not selected through GPIO therefore
	* we use default register set A for voltage ramping.
	*/
	if (regulator->reg_rselect == NO_GPIO) {
	/* Select register set A */
	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	info->conf.sel_mask, DA9055_SEL_REG_A);
	if (ret < 0)
	return ret;

	/* Set the voltage */
	return da9055_reg_update(regulator->da9055, info->volt.reg_a,
	info->volt.v_mask, selector);
	}

	/*
	* Here regulator register set A/B is selected through GPIO.
	* Therefore we first determine the selected register set A/B and
	* then set the desired voltage for that register set A/B.
	*/
	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
	if (ret < 0)
	return ret;

	ret &= info->conf.sel_mask;

	/* Set the voltage */
	if (ret == DA9055_REGUALTOR_SET_A)
	return da9055_reg_update(regulator->da9055, info->volt.reg_a,
	info->volt.v_mask, selector);
	else
	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
	info->volt.v_mask, selector);
	}

	static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
	int uV)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;
	int ret;

	/* Select register set B for suspend voltage ramping. */
	if (regulator->reg_rselect == NO_GPIO) {
	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	info->conf.sel_mask, DA9055_SEL_REG_B);
	if (ret < 0)
	return ret;
	}

	ret = regulator_map_voltage_linear(rdev, uV, uV);
	if (ret < 0)
	return ret;

	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
	info->volt.v_mask, ret);
	}

	static int da9055_suspend_enable(struct regulator_dev *rdev)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;

	/* Select register set B for voltage ramping. */
	if (regulator->reg_rselect == NO_GPIO)
	return da9055_reg_update(regulator->da9055, info->conf.reg,
	info->conf.sel_mask, DA9055_SEL_REG_B);
	else
	return 0;
	}

	static int da9055_suspend_disable(struct regulator_dev *rdev)
	{
	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9055_regulator_info *info = regulator->info;

	/* Diselect register set B. */
	if (regulator->reg_rselect == NO_GPIO)
	return da9055_reg_update(regulator->da9055, info->conf.reg,
	info->conf.sel_mask, DA9055_SEL_REG_A);
	else
	return 0;
	}

	static const struct regulator_ops da9055_buck_ops = {
	.get_mode = da9055_buck_get_mode,
	.set_mode = da9055_buck_set_mode,

	.get_current_limit = regulator_get_current_limit_regmap,
	.set_current_limit = regulator_set_current_limit_regmap,

	.get_voltage_sel = da9055_regulator_get_voltage_sel,
	.set_voltage_sel = da9055_regulator_set_voltage_sel,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,

	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
	.set_suspend_enable = da9055_suspend_enable,
	.set_suspend_disable = da9055_suspend_disable,
	.set_suspend_mode = da9055_buck_set_mode,
	};

	static const struct regulator_ops da9055_ldo_ops = {
	.get_mode = da9055_ldo_get_mode,
	.set_mode = da9055_ldo_set_mode,

	.get_voltage_sel = da9055_regulator_get_voltage_sel,
	.set_voltage_sel = da9055_regulator_set_voltage_sel,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,

	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
	.set_suspend_enable = da9055_suspend_enable,
	.set_suspend_disable = da9055_suspend_disable,
	.set_suspend_mode = da9055_ldo_set_mode,

	};

	#define DA9055_LDO(_id, step, min, max, vbits, voffset) \
	{\
	.reg_desc = {\
	.name = #_id,\
	.of_match = of_match_ptr(#_id),\
	.regulators_node = of_match_ptr("regulators"),\
	.ops = &da9055_ldo_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9055_ID_##_id,\
	.n_voltages = (max - min) / step + 1 + (voffset), \
	.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	.enable_mask = 1, \
	.min_uV = (min) * 1000,\
	.uV_step = (step) * 1000,\
	.linear_min_sel = (voffset),\
	.owner = THIS_MODULE,\
	},\
	.conf = {\
	.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	.sel_mask = (1 << 4),\
	.en_mask = 1,\
	},\
	.volt = {\
	.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
	.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
	.sl_shift = 7,\
	.v_mask = (1 << (vbits)) - 1,\
	},\
	}

	#define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
	{\
	.reg_desc = {\
	.name = #_id,\
	.of_match = of_match_ptr(#_id),\
	.regulators_node = of_match_ptr("regulators"),\
	.ops = &da9055_buck_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9055_ID_##_id,\
	.n_voltages = (max - min) / step + 1 + (voffset), \
	.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	.enable_mask = 1,\
	.min_uV = (min) * 1000,\
	.uV_step = (step) * 1000,\
	.linear_min_sel = (voffset),\
	.owner = THIS_MODULE,\
	.curr_table = da9055_current_limits,\
	.n_current_limits = ARRAY_SIZE(da9055_current_limits),\
	.csel_reg = DA9055_REG_BUCK_LIM,\
	.csel_mask = (mbits),\
	},\
	.conf = {\
	.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
	.sel_mask = (1 << 4),\
	.en_mask = 1,\
	},\
	.volt = {\
	.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
	.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
	.sl_shift = 7,\
	.v_mask = (1 << (vbits)) - 1,\
	},\
	.mode = {\
	.reg = DA9055_REG_BCORE_MODE,\
	.mask = (mbits),\
	.shift = (sbits),\
	},\
	}

	static struct da9055_regulator_info da9055_regulator_info[] = {
	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
	};

	/*
	* Configures regulator to be controlled either through GPIO 1 or 2.
	* GPIO can control regulator state and/or select the regulator register
	* set A/B for voltage ramping.
	*/
	static int da9055_gpio_init(struct da9055_regulator *regulator,
	struct regulator_config *config,
	struct da9055_pdata *pdata, int id)
	{
	struct da9055_regulator_info *info = regulator->info;
	int ret = 0;

	if (!pdata)
	return 0;

	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
	char name[18];
	int gpio_mux = pdata->gpio_ren[id];

	config->ena_gpiod = pdata->ena_gpiods[id];

	/*
	* GPI pin is muxed with regulator to control the
	* regulator state.
	*/
	sprintf(name, "DA9055 GPI %d", gpio_mux);
	ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
	name);
	if (ret < 0)
	goto err;

	/*
	* Let the regulator know that its state is controlled
	* through GPI.
	*/
	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	DA9055_E_GPI_MASK,
	pdata->reg_ren[id]
	<< DA9055_E_GPI_SHIFT);
	if (ret < 0)
	goto err;
	}

	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
	char name[18];
	int gpio_mux = pdata->gpio_rsel[id];

	regulator->reg_rselect = pdata->reg_rsel[id];

	/*
	* GPI pin is muxed with regulator to select the
	* regulator register set A/B for voltage ramping.
	*/
	sprintf(name, "DA9055 GPI %d", gpio_mux);
	ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
	name);
	if (ret < 0)
	goto err;

	/*
	* Let the regulator know that its register set A/B
	* will be selected through GPI for voltage ramping.
	*/
	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
	DA9055_V_GPI_MASK,
	pdata->reg_rsel[id]
	<< DA9055_V_GPI_SHIFT);
	}

	err:
	return ret;
	}

	static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
	{
	struct da9055_regulator *regulator = data;

	regulator_notifier_call_chain(regulator->rdev,
	REGULATOR_EVENT_OVER_CURRENT, NULL);

	return IRQ_HANDLED;
	}

	static inline struct da9055_regulator_info *find_regulator_info(int id)
	{
	struct da9055_regulator_info *info;
	int i;

	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
	info = &da9055_regulator_info[i];
	if (info->reg_desc.id == id)
	return info;
	}

	return NULL;
	}

	static int da9055_regulator_probe(struct platform_device *pdev)
	{
	struct regulator_config config = { };
	struct da9055_regulator *regulator;
	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
	struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
	int ret, irq;

	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
	GFP_KERNEL);
	if (!regulator)
	return -ENOMEM;

	regulator->info = find_regulator_info(pdev->id);
	if (regulator->info == NULL) {
	dev_err(&pdev->dev, "invalid regulator ID specified\n");
	return -EINVAL;
	}

	regulator->da9055 = da9055;
	config.dev = da9055->dev;
	config.driver_data = regulator;
	config.regmap = da9055->regmap;

	if (pdata)
	config.init_data = pdata->regulators[pdev->id];

	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
	if (ret < 0)
	return ret;

	regulator->rdev = devm_regulator_register(&pdev->dev,
	&regulator->info->reg_desc,
	&config);
	if (IS_ERR(regulator->rdev)) {
	dev_err(&pdev->dev, "Failed to register regulator %s\n",
	regulator->info->reg_desc.name);
	return PTR_ERR(regulator->rdev);
	}

	/* Only LDO 5 and 6 has got the over current interrupt */
	if (pdev->id == DA9055_ID_LDO5 \|\| pdev->id == DA9055_ID_LDO6) {
	irq = platform_get_irq_byname(pdev, "REGULATOR");
	if (irq < 0)
	return irq;

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
	da9055_ldo5_6_oc_irq,
	IRQF_TRIGGER_HIGH \|
	IRQF_ONESHOT \|
	IRQF_PROBE_SHARED,
	pdev->name, regulator);
	if (ret != 0) {
	if (ret != -EBUSY) {
	dev_err(&pdev->dev,
	"Failed to request Regulator IRQ %d: %d\n",
	irq, ret);
	return ret;
	}
	}
	}

	platform_set_drvdata(pdev, regulator);

	return 0;
	}

	static struct platform_driver da9055_regulator_driver = {
	.probe = da9055_regulator_probe,
	.driver = {
	.name = "da9055-regulator",
	},
	};

	static int __init da9055_regulator_init(void)
	{
	return platform_driver_register(&da9055_regulator_driver);
	}
	subsys_initcall(da9055_regulator_init);

	static void __exit da9055_regulator_exit(void)
	{
	platform_driver_unregister(&da9055_regulator_driver);
	}
	module_exit(da9055_regulator_exit);

	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:da9055-regulator");