[linux.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/mod_devicetable.h>
#include <linux/platform_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);
	return PTR_ERR_OR_ZERO(rdev);
}

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,
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.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>
045a44d4 RH	11	#include <linux/mod_devicetable.h>
045a44d4 RH	12	#include <linux/platform_device.h>
31e54086 PM	13	#include <linux/regulator/driver.h>
	14	#include <linux/regulator/machine.h>
	15	#include <linux/regulator/of_regulator.h>
	16	#include <linux/vexpress.h>
	17
31e54086 PM	18	static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
31e54086 PM	19	{
eeb1b235 AL	20	unsigned int uV;
eeb1b235 AL	21	int err = regmap_read(regdev->regmap, 0, &uV);
31e54086 PM	22
	23	return err ? err : uV;
	24	}
	25
	26	static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
	27	int min_uV, int max_uV, unsigned *selector)
	28	{
eeb1b235	29	return regmap_write(regdev->regmap, 0, min_uV);
31e54086 PM	30	}
31e54086 PM	31
ab54a4d7	32	static const struct regulator_ops vexpress_regulator_ops_ro = {
31e54086 PM	33	.get_voltage = vexpress_regulator_get_voltage,
	34	};
	35
ab54a4d7	36	static const struct regulator_ops vexpress_regulator_ops = {
31e54086 PM	37	.get_voltage = vexpress_regulator_get_voltage,
	38	.set_voltage = vexpress_regulator_set_voltage,
	39	};
	40
	41	static int vexpress_regulator_probe(struct platform_device *pdev)
	42	{
eeb1b235	43	struct regulator_desc *desc;
31e54086 PM	44	struct regulator_init_data *init_data;
31e54086 PM	45	struct regulator_config config = { };
eeb1b235 AL	46	struct regulator_dev *rdev;
eeb1b235 AL	47	struct regmap *regmap;
31e54086	48
eeb1b235 AL	49	desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
eeb1b235 AL	50	if (!desc)
3b9334ac	51	return -ENOMEM;
31e54086	52
eeb1b235 AL	53	regmap = devm_regmap_init_vexpress_config(&pdev->dev);
	54	if (IS_ERR(regmap))
	55	return PTR_ERR(regmap);
31e54086	56
eeb1b235 AL	57	desc->name = dev_name(&pdev->dev);
	58	desc->type = REGULATOR_VOLTAGE;
	59	desc->owner = THIS_MODULE;
	60	desc->continuous_voltage_range = true;
31e54086	61
072e78b1	62	init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
eeb1b235	63	desc);
3b9334ac PM	64	if (!init_data)
3b9334ac PM	65	return -EINVAL;
31e54086 PM	66
	67	init_data->constraints.apply_uV = 0;
	68	if (init_data->constraints.min_uV && init_data->constraints.max_uV)
eeb1b235	69	desc->ops = &vexpress_regulator_ops;
31e54086	70	else
eeb1b235	71	desc->ops = &vexpress_regulator_ops_ro;
31e54086	72
eeb1b235	73	config.regmap = regmap;
31e54086 PM	74	config.dev = &pdev->dev;
31e54086 PM	75	config.init_data = init_data;
31e54086 PM	76	config.of_node = pdev->dev.of_node;
31e54086 PM	77
eeb1b235	78	rdev = devm_regulator_register(&pdev->dev, desc, &config);
1d7c4c11	79	return PTR_ERR_OR_ZERO(rdev);
31e54086 PM	80	}
31e54086 PM	81
1439afd8	82	static const struct of_device_id vexpress_regulator_of_match[] = {
31e54086	83	{ .compatible = "arm,vexpress-volt", },
9f4e45f7	84	{ }
31e54086	85	};
7209fee8	86	MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
31e54086 PM	87
	88	static struct platform_driver vexpress_regulator_driver = {
	89	.probe = vexpress_regulator_probe,
31e54086 PM	90	.driver = {
31e54086 PM	91	.name = DRVNAME,
259b93b2	92	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
31e54086 PM	93	.of_match_table = vexpress_regulator_of_match,
	94	},
	95	};
	96
	97	module_platform_driver(vexpress_regulator_driver);
	98
	99	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	100	MODULE_DESCRIPTION("Versatile Express regulator");
	101	MODULE_LICENSE("GPL");
	102	MODULE_ALIAS("platform:vexpress-regulator");