drivers/regulator/lp873x-regulator.c - kernel/common - Git at Google

 /*
  * Regulator driver for LP873X PMIC
  *
  * Copyright (C) 2016 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 version 2 as
  * published by the Free Software Foundation.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether expressed or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License version 2 for more details.
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>

 #include <linux/mfd/lp873x.h>

 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
 			 _delay, _lr, _cr)				\
 	[_id] = {							\
 		.desc = {						\
 			.name			= _name,		\
 			.supply_name		= _of "-in",		\
 			.id			= _id,			\
 			.of_match		= of_match_ptr(_of),	\
 			.regulators_node	= of_match_ptr("regulators"),\
 			.ops			= &_ops,		\
 			.n_voltages		= _n,			\
 			.type			= REGULATOR_VOLTAGE,	\
 			.owner			= THIS_MODULE,		\
 			.vsel_reg		= _vr,			\
 			.vsel_mask		= _vm,			\
 			.enable_reg		= _er,			\
 			.enable_mask		= _em,			\
 			.ramp_delay		= _delay,		\
 			.linear_ranges		= _lr,			\
 			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
 		},							\
 		.ctrl2_reg = _cr,					\
 	}

 struct lp873x_regulator {
 	struct regulator_desc desc;
 	unsigned int ctrl2_reg;
 };

 static const struct lp873x_regulator regulators[];

 static const struct regulator_linear_range buck0_buck1_ranges[] = {
 	REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
 	REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
 	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
 	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
 };

 static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
 	REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
 };

 static unsigned int lp873x_buck_ramp_delay[] = {
 	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
 };

 /* LP873X BUCK current limit */
 static const unsigned int lp873x_buck_uA[] = {
 	1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
 };

 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
 				      int ramp_delay)
 {
 	int id = rdev_get_id(rdev);
 	struct lp873x *lp873 = rdev_get_drvdata(rdev);
 	unsigned int reg;
 	int ret;

 	if (ramp_delay <= 470)
 		reg = 7;
 	else if (ramp_delay <= 940)
 		reg = 6;
 	else if (ramp_delay <= 1900)
 		reg = 5;
 	else if (ramp_delay <= 3800)
 		reg = 4;
 	else if (ramp_delay <= 7500)
 		reg = 3;
 	else if (ramp_delay <= 10000)
 		reg = 2;
 	else if (ramp_delay <= 15000)
 		reg = 1;
 	else
 		reg = 0;

 	ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
 				 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
 				 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
 	if (ret) {
 		dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 		return ret;
 	}

 	rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];

 	return 0;
 }

 static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,
 					 int min_uA, int max_uA)
 {
 	int id = rdev_get_id(rdev);
 	struct lp873x *lp873 = rdev_get_drvdata(rdev);
 	int i;

 	for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {
 		if (lp873x_buck_uA[i] >= min_uA &&
 		    lp873x_buck_uA[i] <= max_uA)
 			return regmap_update_bits(lp873->regmap,
 						  regulators[id].ctrl2_reg,
 						  LP873X_BUCK0_CTRL_2_BUCK0_ILIM,
 						  i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));
 	}

 	return -EINVAL;
 }

 static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)
 {
 	int id = rdev_get_id(rdev);
 	struct lp873x *lp873 = rdev_get_drvdata(rdev);
 	int ret;
 	unsigned int val;

 	ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);
 	if (ret)
 		return ret;

 	val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>
 	       __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);

 	return (val < ARRAY_SIZE(lp873x_buck_uA)) ?
 			lp873x_buck_uA[val] : -EINVAL;
 }

 /* Operations permitted on BUCK0, BUCK1 */
 static struct regulator_ops lp873x_buck01_ops = {
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 	.list_voltage		= regulator_list_voltage_linear_range,
 	.map_voltage		= regulator_map_voltage_linear_range,
 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
 	.set_ramp_delay		= lp873x_buck_set_ramp_delay,
 	.set_current_limit	= lp873x_buck_set_current_limit,
 	.get_current_limit	= lp873x_buck_get_current_limit,
 };

 /* Operations permitted on LDO0 and LDO1 */
 static struct regulator_ops lp873x_ldo01_ops = {
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 	.list_voltage		= regulator_list_voltage_linear_range,
 	.map_voltage		= regulator_map_voltage_linear_range,
 };

 static const struct lp873x_regulator regulators[] = {
 	LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
 			 256, LP873X_REG_BUCK0_VOUT,
 			 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
 			 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
 			 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 	LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
 			 256, LP873X_REG_BUCK1_VOUT,
 			 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
 			 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
 			 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 	LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
 			 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
 			 LP873X_REG_LDO0_CTRL,
 			 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 	LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
 			 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
 			 LP873X_REG_LDO1_CTRL,
 			 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
 };

 static int lp873x_regulator_probe(struct platform_device *pdev)
 {
 	struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 	struct regulator_config config = { };
 	struct regulator_dev *rdev;
 	int i;

 	platform_set_drvdata(pdev, lp873);

 	config.dev = &pdev->dev;
 	config.dev->of_node = lp873->dev->of_node;
 	config.driver_data = lp873;
 	config.regmap = lp873->regmap;

 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 					       &config);
 		if (IS_ERR(rdev)) {
 			dev_err(lp873->dev, "failed to register %s regulator\n",
 				pdev->name);
 			return PTR_ERR(rdev);
 		}
 	}

 	return 0;
 }

 static const struct platform_device_id lp873x_regulator_id_table[] = {
 	{ "lp873x-regulator", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);

 static struct platform_driver lp873x_regulator_driver = {
 	.driver = {
 		.name = "lp873x-pmic",
 	},
 	.probe = lp873x_regulator_probe,
 	.id_table = lp873x_regulator_id_table,
 };
 module_platform_driver(lp873x_regulator_driver);

 MODULE_AUTHOR("J Keerthy <[email protected]>");
 MODULE_DESCRIPTION("LP873X voltage regulator driver");
 MODULE_ALIAS("platform:lp873x-pmic");
 MODULE_LICENSE("GPL v2");
	/*
	* Regulator driver for LP873X PMIC
	*
	* Copyright (C) 2016 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 version 2 as
	* published by the Free Software Foundation.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether expressed or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License version 2 for more details.
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>

	#include <linux/mfd/lp873x.h>

	#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
	_delay, _lr, _cr) \
	[_id] = { \
	.desc = { \
	.name = _name, \
	.supply_name = _of "-in", \
	.id = _id, \
	.of_match = of_match_ptr(_of), \
	.regulators_node = of_match_ptr("regulators"),\
	.ops = &_ops, \
	.n_voltages = _n, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.vsel_reg = _vr, \
	.vsel_mask = _vm, \
	.enable_reg = _er, \
	.enable_mask = _em, \
	.ramp_delay = _delay, \
	.linear_ranges = _lr, \
	.n_linear_ranges = ARRAY_SIZE(_lr), \
	}, \
	.ctrl2_reg = _cr, \
	}

	struct lp873x_regulator {
	struct regulator_desc desc;
	unsigned int ctrl2_reg;
	};

	static const struct lp873x_regulator regulators[];

	static const struct regulator_linear_range buck0_buck1_ranges[] = {
	REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
	REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
	};

	static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
	REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
	};

	static unsigned int lp873x_buck_ramp_delay[] = {
	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
	};

	/* LP873X BUCK current limit */
	static const unsigned int lp873x_buck_uA[] = {
	1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
	};

	static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
	int ramp_delay)
	{
	int id = rdev_get_id(rdev);
	struct lp873x *lp873 = rdev_get_drvdata(rdev);
	unsigned int reg;
	int ret;

	if (ramp_delay <= 470)
	reg = 7;
	else if (ramp_delay <= 940)
	reg = 6;
	else if (ramp_delay <= 1900)
	reg = 5;
	else if (ramp_delay <= 3800)
	reg = 4;
	else if (ramp_delay <= 7500)
	reg = 3;
	else if (ramp_delay <= 10000)
	reg = 2;
	else if (ramp_delay <= 15000)
	reg = 1;
	else
	reg = 0;

	ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
	LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
	reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
	if (ret) {
	dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
	return ret;
	}

	rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];

	return 0;
	}

	static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,
	int min_uA, int max_uA)
	{
	int id = rdev_get_id(rdev);
	struct lp873x *lp873 = rdev_get_drvdata(rdev);
	int i;

	for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {
	if (lp873x_buck_uA[i] >= min_uA &&
	lp873x_buck_uA[i] <= max_uA)
	return regmap_update_bits(lp873->regmap,
	regulators[id].ctrl2_reg,
	LP873X_BUCK0_CTRL_2_BUCK0_ILIM,
	i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));
	}

	return -EINVAL;
	}

	static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)
	{
	int id = rdev_get_id(rdev);
	struct lp873x *lp873 = rdev_get_drvdata(rdev);
	int ret;
	unsigned int val;

	ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);
	if (ret)
	return ret;

	val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>
	__ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);

	return (val < ARRAY_SIZE(lp873x_buck_uA)) ?
	lp873x_buck_uA[val] : -EINVAL;
	}

	/* Operations permitted on BUCK0, BUCK1 */
	static struct regulator_ops lp873x_buck01_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.set_ramp_delay = lp873x_buck_set_ramp_delay,
	.set_current_limit = lp873x_buck_set_current_limit,
	.get_current_limit = lp873x_buck_get_current_limit,
	};

	/* Operations permitted on LDO0 and LDO1 */
	static struct regulator_ops lp873x_ldo01_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	};

	static const struct lp873x_regulator regulators[] = {
	LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
	256, LP873X_REG_BUCK0_VOUT,
	LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
	LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
	buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
	LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
	256, LP873X_REG_BUCK1_VOUT,
	LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
	LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
	buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
	LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
	LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
	LP873X_REG_LDO0_CTRL,
	LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
	LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
	LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
	LP873X_REG_LDO1_CTRL,
	LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
	};

	static int lp873x_regulator_probe(struct platform_device *pdev)
	{
	struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	int i;

	platform_set_drvdata(pdev, lp873);

	config.dev = &pdev->dev;
	config.dev->of_node = lp873->dev->of_node;
	config.driver_data = lp873;
	config.regmap = lp873->regmap;

	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
	rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
	&config);
	if (IS_ERR(rdev)) {
	dev_err(lp873->dev, "failed to register %s regulator\n",
	pdev->name);
	return PTR_ERR(rdev);
	}
	}

	return 0;
	}

	static const struct platform_device_id lp873x_regulator_id_table[] = {
	{ "lp873x-regulator", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);

	static struct platform_driver lp873x_regulator_driver = {
	.driver = {
	.name = "lp873x-pmic",
	},
	.probe = lp873x_regulator_probe,
	.id_table = lp873x_regulator_id_table,
	};
	module_platform_driver(lp873x_regulator_driver);

	MODULE_AUTHOR("J Keerthy <[email protected]>");
	MODULE_DESCRIPTION("LP873X voltage regulator driver");
	MODULE_ALIAS("platform:lp873x-pmic");
	MODULE_LICENSE("GPL v2");