[linux-2.6-block.git] / drivers / regulator / vexpress-regulator.c

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2012 ARM Limited

#define DRVNAME "vexpress-regulator"
#define pr_fmt(fmt) DRVNAME ": " fmt

#include <linux/device.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/vexpress.h>

static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
{
	unsigned int uV;
	int err = regmap_read(regdev->regmap, 0, &uV);

	return err ? err : uV;
}

static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
		int min_uV, int max_uV, unsigned *selector)
{
	return regmap_write(regdev->regmap, 0, min_uV);
}

static const struct regulator_ops vexpress_regulator_ops_ro = {
	.get_voltage = vexpress_regulator_get_voltage,
};

static const struct regulator_ops vexpress_regulator_ops = {
	.get_voltage = vexpress_regulator_get_voltage,
	.set_voltage = vexpress_regulator_set_voltage,
};

static int vexpress_regulator_probe(struct platform_device *pdev)
{
	struct regulator_desc *desc;
	struct regulator_init_data *init_data;
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	struct regmap *regmap;

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

	regmap = devm_regmap_init_vexpress_config(&pdev->dev);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	desc->name = dev_name(&pdev->dev);
	desc->type = REGULATOR_VOLTAGE;
	desc->owner = THIS_MODULE;
	desc->continuous_voltage_range = true;

	init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
					       desc);
	if (!init_data)
		return -EINVAL;

	init_data->constraints.apply_uV = 0;
	if (init_data->constraints.min_uV && init_data->constraints.max_uV)
		desc->ops = &vexpress_regulator_ops;
	else
		desc->ops = &vexpress_regulator_ops_ro;

	config.regmap = regmap;
	config.dev = &pdev->dev;
	config.init_data = init_data;
	config.of_node = pdev->dev.of_node;

	rdev = devm_regulator_register(&pdev->dev, desc, &config);
	if (IS_ERR(rdev))
		return PTR_ERR(rdev);

	return 0;
}

static const struct of_device_id vexpress_regulator_of_match[] = {
	{ .compatible = "arm,vexpress-volt", },
	{ }
};
MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);

static struct platform_driver vexpress_regulator_driver = {
	.probe = vexpress_regulator_probe,
	.driver	= {
		.name = DRVNAME,
		.of_match_table = vexpress_regulator_of_match,
	},
};

module_platform_driver(vexpress_regulator_driver);

MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
MODULE_DESCRIPTION("Versatile Express regulator");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:vexpress-regulator");
Commit	Line	Data
c5e911ad AL	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// Copyright (C) 2012 ARM Limited
31e54086 PM	4
	5	#define DRVNAME "vexpress-regulator"
	6	#define pr_fmt(fmt) DRVNAME ": " fmt
	7
	8	#include <linux/device.h>
	9	#include <linux/err.h>
	10	#include <linux/module.h>
	11	#include <linux/of_device.h>
	12	#include <linux/regulator/driver.h>
	13	#include <linux/regulator/machine.h>
	14	#include <linux/regulator/of_regulator.h>
	15	#include <linux/vexpress.h>
	16
31e54086 PM	17	static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
31e54086 PM	18	{
eeb1b235 AL	19	unsigned int uV;
eeb1b235 AL	20	int err = regmap_read(regdev->regmap, 0, &uV);
31e54086 PM	21
	22	return err ? err : uV;
	23	}
	24
	25	static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
	26	int min_uV, int max_uV, unsigned *selector)
	27	{
eeb1b235	28	return regmap_write(regdev->regmap, 0, min_uV);
31e54086 PM	29	}
31e54086 PM	30
ab54a4d7	31	static const struct regulator_ops vexpress_regulator_ops_ro = {
31e54086 PM	32	.get_voltage = vexpress_regulator_get_voltage,
	33	};
	34
ab54a4d7	35	static const struct regulator_ops vexpress_regulator_ops = {
31e54086 PM	36	.get_voltage = vexpress_regulator_get_voltage,
	37	.set_voltage = vexpress_regulator_set_voltage,
	38	};
	39
	40	static int vexpress_regulator_probe(struct platform_device *pdev)
	41	{
eeb1b235	42	struct regulator_desc *desc;
31e54086 PM	43	struct regulator_init_data *init_data;
31e54086 PM	44	struct regulator_config config = { };
eeb1b235 AL	45	struct regulator_dev *rdev;
eeb1b235 AL	46	struct regmap *regmap;
31e54086	47
eeb1b235 AL	48	desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
eeb1b235 AL	49	if (!desc)
3b9334ac	50	return -ENOMEM;
31e54086	51
eeb1b235 AL	52	regmap = devm_regmap_init_vexpress_config(&pdev->dev);
	53	if (IS_ERR(regmap))
	54	return PTR_ERR(regmap);
31e54086	55
eeb1b235 AL	56	desc->name = dev_name(&pdev->dev);
	57	desc->type = REGULATOR_VOLTAGE;
	58	desc->owner = THIS_MODULE;
	59	desc->continuous_voltage_range = true;
31e54086	60
072e78b1	61	init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
eeb1b235	62	desc);
3b9334ac PM	63	if (!init_data)
3b9334ac PM	64	return -EINVAL;
31e54086 PM	65
	66	init_data->constraints.apply_uV = 0;
	67	if (init_data->constraints.min_uV && init_data->constraints.max_uV)
eeb1b235	68	desc->ops = &vexpress_regulator_ops;
31e54086	69	else
eeb1b235	70	desc->ops = &vexpress_regulator_ops_ro;
31e54086	71
eeb1b235	72	config.regmap = regmap;
31e54086 PM	73	config.dev = &pdev->dev;
31e54086 PM	74	config.init_data = init_data;
31e54086 PM	75	config.of_node = pdev->dev.of_node;
31e54086 PM	76
eeb1b235 AL	77	rdev = devm_regulator_register(&pdev->dev, desc, &config);
	78	if (IS_ERR(rdev))
	79	return PTR_ERR(rdev);
31e54086	80
31e54086 PM	81	return 0;
	82	}
	83
1439afd8	84	static const struct of_device_id vexpress_regulator_of_match[] = {
31e54086	85	{ .compatible = "arm,vexpress-volt", },
9f4e45f7	86	{ }
31e54086	87	};
7209fee8	88	MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
31e54086 PM	89
	90	static struct platform_driver vexpress_regulator_driver = {
	91	.probe = vexpress_regulator_probe,
31e54086 PM	92	.driver = {
31e54086 PM	93	.name = DRVNAME,
31e54086 PM	94	.of_match_table = vexpress_regulator_of_match,
	95	},
	96	};
	97
	98	module_platform_driver(vexpress_regulator_driver);
	99
	100	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	101	MODULE_DESCRIPTION("Versatile Express regulator");
	102	MODULE_LICENSE("GPL");
	103	MODULE_ALIAS("platform:vexpress-regulator");