drivers/regulator/lm363x-regulator.c - linux - Git at Google

 /*
  * TI LM363X Regulator Driver
  *
  * Copyright 2015 Texas Instruments
  *
  * Author: Milo Kim <milo.kim@ti.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/err.h>
 #include <linux/kernel.h>
 #include <linux/mfd/ti-lmu.h>
 #include <linux/mfd/ti-lmu-register.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/gpio/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/slab.h>

 /* LM3631 */
 #define LM3631_BOOST_VSEL_MAX		0x25
 #define LM3631_LDO_VSEL_MAX		0x28
 #define LM3631_CONT_VSEL_MAX		0x03
 #define LM3631_VBOOST_MIN		4500000
 #define LM3631_VCONT_MIN		1800000
 #define LM3631_VLDO_MIN			4000000
 #define ENABLE_TIME_USEC		1000

 /* LM3632 */
 #define LM3632_BOOST_VSEL_MAX		0x26
 #define LM3632_LDO_VSEL_MAX		0x29
 #define LM3632_VBOOST_MIN		4500000
 #define LM3632_VLDO_MIN			4000000

 /* Common */
 #define LM363X_STEP_50mV		50000
 #define LM363X_STEP_500mV		500000

 static const int ldo_cont_enable_time[] = {
 	0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
 };

 static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
 {
 	enum lm363x_regulator_id id = rdev_get_id(rdev);
 	u8 val, addr, mask;

 	switch (id) {
 	case LM3631_LDO_CONT:
 		addr = LM3631_REG_ENTIME_VCONT;
 		mask = LM3631_ENTIME_CONT_MASK;
 		break;
 	case LM3631_LDO_OREF:
 		addr = LM3631_REG_ENTIME_VOREF;
 		mask = LM3631_ENTIME_MASK;
 		break;
 	case LM3631_LDO_POS:
 		addr = LM3631_REG_ENTIME_VPOS;
 		mask = LM3631_ENTIME_MASK;
 		break;
 	case LM3631_LDO_NEG:
 		addr = LM3631_REG_ENTIME_VNEG;
 		mask = LM3631_ENTIME_MASK;
 		break;
 	default:
 		return 0;
 	}

 	if (regmap_read(rdev->regmap, addr, (unsigned int *)&val))
 		return -EINVAL;

 	val = (val & mask) >> LM3631_ENTIME_SHIFT;

 	if (id == LM3631_LDO_CONT)
 		return ldo_cont_enable_time[val];
 	else
 		return ENABLE_TIME_USEC * val;
 }

 static struct regulator_ops lm363x_boost_voltage_table_ops = {
 	.list_voltage     = regulator_list_voltage_linear,
 	.set_voltage_sel  = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel  = regulator_get_voltage_sel_regmap,
 };

 static struct regulator_ops lm363x_regulator_voltage_table_ops = {
 	.list_voltage     = regulator_list_voltage_linear,
 	.set_voltage_sel  = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel  = regulator_get_voltage_sel_regmap,
 	.enable           = regulator_enable_regmap,
 	.disable          = regulator_disable_regmap,
 	.is_enabled       = regulator_is_enabled_regmap,
 	.enable_time      = lm363x_regulator_enable_time,
 };

 static const struct regulator_desc lm363x_regulator_desc[] = {
 	/* LM3631 */
 	{
 		.name           = "vboost",
 		.of_match	= "vboost",
 		.id             = LM3631_BOOST,
 		.ops            = &lm363x_boost_voltage_table_ops,
 		.n_voltages     = LM3631_BOOST_VSEL_MAX + 1,
 		.min_uV         = LM3631_VBOOST_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3631_REG_VOUT_BOOST,
 		.vsel_mask      = LM3631_VOUT_MASK,
 	},
 	{
 		.name           = "ldo_cont",
 		.of_match	= "vcont",
 		.id             = LM3631_LDO_CONT,
 		.ops            = &lm363x_regulator_voltage_table_ops,
 		.n_voltages     = LM3631_CONT_VSEL_MAX + 1,
 		.min_uV         = LM3631_VCONT_MIN,
 		.uV_step        = LM363X_STEP_500mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3631_REG_VOUT_CONT,
 		.vsel_mask      = LM3631_VOUT_CONT_MASK,
 		.enable_reg     = LM3631_REG_LDO_CTRL2,
 		.enable_mask    = LM3631_EN_CONT_MASK,
 	},
 	{
 		.name           = "ldo_oref",
 		.of_match	= "voref",
 		.id             = LM3631_LDO_OREF,
 		.ops            = &lm363x_regulator_voltage_table_ops,
 		.n_voltages     = LM3631_LDO_VSEL_MAX + 1,
 		.min_uV         = LM3631_VLDO_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3631_REG_VOUT_OREF,
 		.vsel_mask      = LM3631_VOUT_MASK,
 		.enable_reg     = LM3631_REG_LDO_CTRL1,
 		.enable_mask    = LM3631_EN_OREF_MASK,
 	},
 	{
 		.name           = "ldo_vpos",
 		.of_match	= "vpos",
 		.id             = LM3631_LDO_POS,
 		.ops            = &lm363x_regulator_voltage_table_ops,
 		.n_voltages     = LM3631_LDO_VSEL_MAX + 1,
 		.min_uV         = LM3631_VLDO_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3631_REG_VOUT_POS,
 		.vsel_mask      = LM3631_VOUT_MASK,
 		.enable_reg     = LM3631_REG_LDO_CTRL1,
 		.enable_mask    = LM3631_EN_VPOS_MASK,
 	},
 	{
 		.name           = "ldo_vneg",
 		.of_match	= "vneg",
 		.id             = LM3631_LDO_NEG,
 		.ops            = &lm363x_regulator_voltage_table_ops,
 		.n_voltages     = LM3631_LDO_VSEL_MAX + 1,
 		.min_uV         = LM3631_VLDO_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3631_REG_VOUT_NEG,
 		.vsel_mask      = LM3631_VOUT_MASK,
 		.enable_reg     = LM3631_REG_LDO_CTRL1,
 		.enable_mask    = LM3631_EN_VNEG_MASK,
 	},
 	/* LM3632 */
 	{
 		.name           = "vboost",
 		.of_match	= "vboost",
 		.id             = LM3632_BOOST,
 		.ops            = &lm363x_boost_voltage_table_ops,
 		.n_voltages     = LM3632_BOOST_VSEL_MAX + 1,
 		.min_uV         = LM3632_VBOOST_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3632_REG_VOUT_BOOST,
 		.vsel_mask      = LM3632_VOUT_MASK,
 	},
 	{
 		.name           = "ldo_vpos",
 		.of_match	= "vpos",
 		.id             = LM3632_LDO_POS,
 		.ops            = &lm363x_regulator_voltage_table_ops,
 		.n_voltages     = LM3632_LDO_VSEL_MAX + 1,
 		.min_uV         = LM3632_VLDO_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3632_REG_VOUT_POS,
 		.vsel_mask      = LM3632_VOUT_MASK,
 		.enable_reg     = LM3632_REG_BIAS_CONFIG,
 		.enable_mask    = LM3632_EN_VPOS_MASK,
 	},
 	{
 		.name           = "ldo_vneg",
 		.of_match	= "vneg",
 		.id             = LM3632_LDO_NEG,
 		.ops            = &lm363x_regulator_voltage_table_ops,
 		.n_voltages     = LM3632_LDO_VSEL_MAX + 1,
 		.min_uV         = LM3632_VLDO_MIN,
 		.uV_step        = LM363X_STEP_50mV,
 		.type           = REGULATOR_VOLTAGE,
 		.owner          = THIS_MODULE,
 		.vsel_reg       = LM3632_REG_VOUT_NEG,
 		.vsel_mask      = LM3632_VOUT_MASK,
 		.enable_reg     = LM3632_REG_BIAS_CONFIG,
 		.enable_mask    = LM3632_EN_VNEG_MASK,
 	},
 };

 static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev, int id)
 {
 	/*
 	 * Check LCM_EN1/2_GPIO is configured.
 	 * Those pins are used for enabling VPOS/VNEG LDOs.
 	 * Do not use devm* here: the regulator core takes over the
 	 * lifecycle management of the GPIO descriptor.
 	 */
 	switch (id) {
 	case LM3632_LDO_POS:
 		return gpiod_get_index_optional(dev, "enable", 0,
 				GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
 	case LM3632_LDO_NEG:
 		return gpiod_get_index_optional(dev, "enable", 1,
 				GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
 	default:
 		return NULL;
 	}
 }

 static int lm363x_regulator_probe(struct platform_device *pdev)
 {
 	struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
 	struct regmap *regmap = lmu->regmap;
 	struct regulator_config cfg = { };
 	struct regulator_dev *rdev;
 	struct device *dev = &pdev->dev;
 	int id = pdev->id;
 	struct gpio_desc *gpiod;
 	int ret;

 	cfg.dev = dev;
 	cfg.regmap = regmap;

 	/*
 	 * LM3632 LDOs can be controlled by external pin.
 	 * Register update is required if the pin is used.
 	 */
 	gpiod = lm363x_regulator_of_get_enable_gpio(dev, id);
 	if (gpiod) {
 		cfg.ena_gpiod = gpiod;

 		ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
 					 LM3632_EXT_EN_MASK,
 					 LM3632_EXT_EN_MASK);
 		if (ret) {
 			if (gpiod)
 				gpiod_put(gpiod);
 			dev_err(dev, "External pin err: %d\n", ret);
 			return ret;
 		}
 	}

 	rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
 	if (IS_ERR(rdev)) {
 		ret = PTR_ERR(rdev);
 		dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
 		return ret;
 	}

 	return 0;
 }

 static struct platform_driver lm363x_regulator_driver = {
 	.probe = lm363x_regulator_probe,
 	.driver = {
 		.name = "lm363x-regulator",
 	},
 };

 module_platform_driver(lm363x_regulator_driver);

 MODULE_DESCRIPTION("TI LM363X Regulator Driver");
 MODULE_AUTHOR("Milo Kim");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:lm363x-regulator");
	/*
	* TI LM363X Regulator Driver
	*
	* Copyright 2015 Texas Instruments
	*
	* Author: Milo Kim <milo.kim@ti.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/err.h>
	#include <linux/kernel.h>
	#include <linux/mfd/ti-lmu.h>
	#include <linux/mfd/ti-lmu-register.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/gpio/consumer.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/slab.h>

	/* LM3631 */
	#define LM3631_BOOST_VSEL_MAX 0x25
	#define LM3631_LDO_VSEL_MAX 0x28
	#define LM3631_CONT_VSEL_MAX 0x03
	#define LM3631_VBOOST_MIN 4500000
	#define LM3631_VCONT_MIN 1800000
	#define LM3631_VLDO_MIN 4000000
	#define ENABLE_TIME_USEC 1000

	/* LM3632 */
	#define LM3632_BOOST_VSEL_MAX 0x26
	#define LM3632_LDO_VSEL_MAX 0x29
	#define LM3632_VBOOST_MIN 4500000
	#define LM3632_VLDO_MIN 4000000

	/* Common */
	#define LM363X_STEP_50mV 50000
	#define LM363X_STEP_500mV 500000

	static const int ldo_cont_enable_time[] = {
	0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
	};

	static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
	{
	enum lm363x_regulator_id id = rdev_get_id(rdev);
	u8 val, addr, mask;

	switch (id) {
	case LM3631_LDO_CONT:
	addr = LM3631_REG_ENTIME_VCONT;
	mask = LM3631_ENTIME_CONT_MASK;
	break;
	case LM3631_LDO_OREF:
	addr = LM3631_REG_ENTIME_VOREF;
	mask = LM3631_ENTIME_MASK;
	break;
	case LM3631_LDO_POS:
	addr = LM3631_REG_ENTIME_VPOS;
	mask = LM3631_ENTIME_MASK;
	break;
	case LM3631_LDO_NEG:
	addr = LM3631_REG_ENTIME_VNEG;
	mask = LM3631_ENTIME_MASK;
	break;
	default:
	return 0;
	}

	if (regmap_read(rdev->regmap, addr, (unsigned int *)&val))
	return -EINVAL;

	val = (val & mask) >> LM3631_ENTIME_SHIFT;

	if (id == LM3631_LDO_CONT)
	return ldo_cont_enable_time[val];
	else
	return ENABLE_TIME_USEC * val;
	}

	static struct regulator_ops lm363x_boost_voltage_table_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	};

	static struct regulator_ops lm363x_regulator_voltage_table_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.enable_time = lm363x_regulator_enable_time,
	};

	static const struct regulator_desc lm363x_regulator_desc[] = {
	/* LM3631 */
	{
	.name = "vboost",
	.of_match = "vboost",
	.id = LM3631_BOOST,
	.ops = &lm363x_boost_voltage_table_ops,
	.n_voltages = LM3631_BOOST_VSEL_MAX + 1,
	.min_uV = LM3631_VBOOST_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3631_REG_VOUT_BOOST,
	.vsel_mask = LM3631_VOUT_MASK,
	},
	{
	.name = "ldo_cont",
	.of_match = "vcont",
	.id = LM3631_LDO_CONT,
	.ops = &lm363x_regulator_voltage_table_ops,
	.n_voltages = LM3631_CONT_VSEL_MAX + 1,
	.min_uV = LM3631_VCONT_MIN,
	.uV_step = LM363X_STEP_500mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3631_REG_VOUT_CONT,
	.vsel_mask = LM3631_VOUT_CONT_MASK,
	.enable_reg = LM3631_REG_LDO_CTRL2,
	.enable_mask = LM3631_EN_CONT_MASK,
	},
	{
	.name = "ldo_oref",
	.of_match = "voref",
	.id = LM3631_LDO_OREF,
	.ops = &lm363x_regulator_voltage_table_ops,
	.n_voltages = LM3631_LDO_VSEL_MAX + 1,
	.min_uV = LM3631_VLDO_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3631_REG_VOUT_OREF,
	.vsel_mask = LM3631_VOUT_MASK,
	.enable_reg = LM3631_REG_LDO_CTRL1,
	.enable_mask = LM3631_EN_OREF_MASK,
	},
	{
	.name = "ldo_vpos",
	.of_match = "vpos",
	.id = LM3631_LDO_POS,
	.ops = &lm363x_regulator_voltage_table_ops,
	.n_voltages = LM3631_LDO_VSEL_MAX + 1,
	.min_uV = LM3631_VLDO_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3631_REG_VOUT_POS,
	.vsel_mask = LM3631_VOUT_MASK,
	.enable_reg = LM3631_REG_LDO_CTRL1,
	.enable_mask = LM3631_EN_VPOS_MASK,
	},
	{
	.name = "ldo_vneg",
	.of_match = "vneg",
	.id = LM3631_LDO_NEG,
	.ops = &lm363x_regulator_voltage_table_ops,
	.n_voltages = LM3631_LDO_VSEL_MAX + 1,
	.min_uV = LM3631_VLDO_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3631_REG_VOUT_NEG,
	.vsel_mask = LM3631_VOUT_MASK,
	.enable_reg = LM3631_REG_LDO_CTRL1,
	.enable_mask = LM3631_EN_VNEG_MASK,
	},
	/* LM3632 */
	{
	.name = "vboost",
	.of_match = "vboost",
	.id = LM3632_BOOST,
	.ops = &lm363x_boost_voltage_table_ops,
	.n_voltages = LM3632_BOOST_VSEL_MAX + 1,
	.min_uV = LM3632_VBOOST_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3632_REG_VOUT_BOOST,
	.vsel_mask = LM3632_VOUT_MASK,
	},
	{
	.name = "ldo_vpos",
	.of_match = "vpos",
	.id = LM3632_LDO_POS,
	.ops = &lm363x_regulator_voltage_table_ops,
	.n_voltages = LM3632_LDO_VSEL_MAX + 1,
	.min_uV = LM3632_VLDO_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3632_REG_VOUT_POS,
	.vsel_mask = LM3632_VOUT_MASK,
	.enable_reg = LM3632_REG_BIAS_CONFIG,
	.enable_mask = LM3632_EN_VPOS_MASK,
	},
	{
	.name = "ldo_vneg",
	.of_match = "vneg",
	.id = LM3632_LDO_NEG,
	.ops = &lm363x_regulator_voltage_table_ops,
	.n_voltages = LM3632_LDO_VSEL_MAX + 1,
	.min_uV = LM3632_VLDO_MIN,
	.uV_step = LM363X_STEP_50mV,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.vsel_reg = LM3632_REG_VOUT_NEG,
	.vsel_mask = LM3632_VOUT_MASK,
	.enable_reg = LM3632_REG_BIAS_CONFIG,
	.enable_mask = LM3632_EN_VNEG_MASK,
	},
	};

	static struct gpio_desc lm363x_regulator_of_get_enable_gpio(struct device dev, int id)
	{
	/*
	* Check LCM_EN1/2_GPIO is configured.
	* Those pins are used for enabling VPOS/VNEG LDOs.
	* Do not use devm* here: the regulator core takes over the
	* lifecycle management of the GPIO descriptor.
	*/
	switch (id) {
	case LM3632_LDO_POS:
	return gpiod_get_index_optional(dev, "enable", 0,
	GPIOD_OUT_LOW \| GPIOD_FLAGS_BIT_NONEXCLUSIVE);
	case LM3632_LDO_NEG:
	return gpiod_get_index_optional(dev, "enable", 1,
	GPIOD_OUT_LOW \| GPIOD_FLAGS_BIT_NONEXCLUSIVE);
	default:
	return NULL;
	}
	}

	static int lm363x_regulator_probe(struct platform_device *pdev)
	{
	struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
	struct regmap *regmap = lmu->regmap;
	struct regulator_config cfg = { };
	struct regulator_dev *rdev;
	struct device *dev = &pdev->dev;
	int id = pdev->id;
	struct gpio_desc *gpiod;
	int ret;

	cfg.dev = dev;
	cfg.regmap = regmap;

	/*
	* LM3632 LDOs can be controlled by external pin.
	* Register update is required if the pin is used.
	*/
	gpiod = lm363x_regulator_of_get_enable_gpio(dev, id);
	if (gpiod) {
	cfg.ena_gpiod = gpiod;

	ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
	LM3632_EXT_EN_MASK,
	LM3632_EXT_EN_MASK);
	if (ret) {
	if (gpiod)
	gpiod_put(gpiod);
	dev_err(dev, "External pin err: %d\n", ret);
	return ret;
	}
	}

	rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
	if (IS_ERR(rdev)) {
	ret = PTR_ERR(rdev);
	dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
	return ret;
	}

	return 0;
	}

	static struct platform_driver lm363x_regulator_driver = {
	.probe = lm363x_regulator_probe,
	.driver = {
	.name = "lm363x-regulator",
	},
	};

	module_platform_driver(lm363x_regulator_driver);

	MODULE_DESCRIPTION("TI LM363X Regulator Driver");
	MODULE_AUTHOR("Milo Kim");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:lm363x-regulator");