[linux-block.git] / drivers / regulator / isl6271a-regulator.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * isl6271a-regulator.c
 *
 * Support for Intersil ISL6271A voltage regulator
 *
 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/i2c.h>
#include <linux/slab.h>

#define	ISL6271A_VOLTAGE_MIN	850000
#define	ISL6271A_VOLTAGE_MAX	1600000
#define	ISL6271A_VOLTAGE_STEP	50000

/* PMIC details */
struct isl_pmic {
	struct i2c_client	*client;
	struct mutex		mtx;
};

static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
{
	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	int idx;

	mutex_lock(&pmic->mtx);

	idx = i2c_smbus_read_byte(pmic->client);
	if (idx < 0)
		dev_err(&pmic->client->dev, "Error getting voltage\n");

	mutex_unlock(&pmic->mtx);
	return idx;
}

static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
				    unsigned selector)
{
	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	int err;

	mutex_lock(&pmic->mtx);

	err = i2c_smbus_write_byte(pmic->client, selector);
	if (err < 0)
		dev_err(&pmic->client->dev, "Error setting voltage\n");

	mutex_unlock(&pmic->mtx);
	return err;
}

static const struct regulator_ops isl_core_ops = {
	.get_voltage_sel = isl6271a_get_voltage_sel,
	.set_voltage_sel = isl6271a_set_voltage_sel,
	.list_voltage	= regulator_list_voltage_linear,
	.map_voltage	= regulator_map_voltage_linear,
};

static const struct regulator_ops isl_fixed_ops = {
	.list_voltage	= regulator_list_voltage_linear,
};

static const struct regulator_desc isl_rd[] = {
	{
		.name		= "Core Buck",
		.id		= 0,
		.n_voltages	= 16,
		.ops		= &isl_core_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.min_uV		= ISL6271A_VOLTAGE_MIN,
		.uV_step	= ISL6271A_VOLTAGE_STEP,
	}, {
		.name		= "LDO1",
		.id		= 1,
		.n_voltages	= 1,
		.ops		= &isl_fixed_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.min_uV		= 1100000,
	}, {
		.name		= "LDO2",
		.id		= 2,
		.n_voltages	= 1,
		.ops		= &isl_fixed_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.min_uV		= 1300000,
	},
};

static int isl6271a_probe(struct i2c_client *i2c)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
	struct regulator_dev *rdev;
	struct regulator_config config = { };
	struct regulator_init_data *init_data	= dev_get_platdata(&i2c->dev);
	struct isl_pmic *pmic;
	int i;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
	if (!pmic)
		return -ENOMEM;

	pmic->client = i2c;

	mutex_init(&pmic->mtx);

	for (i = 0; i < 3; i++) {
		config.dev = &i2c->dev;
		if (i == 0)
			config.init_data = init_data;
		else
			config.init_data = NULL;
		config.driver_data = pmic;

		rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
		if (IS_ERR(rdev)) {
			dev_err(&i2c->dev, "failed to register %s\n", id->name);
			return PTR_ERR(rdev);
		}
	}

	i2c_set_clientdata(i2c, pmic);

	return 0;
}

static const struct i2c_device_id isl6271a_id[] = {
	{.name = "isl6271a", 0 },
	{ },
};

MODULE_DEVICE_TABLE(i2c, isl6271a_id);

static struct i2c_driver isl6271a_i2c_driver = {
	.driver = {
		.name = "isl6271a",
	},
	.probe_new = isl6271a_probe,
	.id_table = isl6271a_id,
};

static int __init isl6271a_init(void)
{
	return i2c_add_driver(&isl6271a_i2c_driver);
}

static void __exit isl6271a_cleanup(void)
{
	i2c_del_driver(&isl6271a_i2c_driver);
}

subsys_initcall(isl6271a_init);
module_exit(isl6271a_cleanup);

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2aec85b2	1	// SPDX-License-Identifier: GPL-2.0-only
51bd6943 MV	2	/*
	3	* isl6271a-regulator.c
	4	*
	5	* Support for Intersil ISL6271A voltage regulator
	6	*
	7	* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
51bd6943 MV	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/err.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/regulator/driver.h>
	16	#include <linux/i2c.h>
51bd6943 MV	17	#include <linux/slab.h>
	18
	19	#define ISL6271A_VOLTAGE_MIN 850000
	20	#define ISL6271A_VOLTAGE_MAX 1600000
	21	#define ISL6271A_VOLTAGE_STEP 50000
	22
	23	/* PMIC details */
	24	struct isl_pmic {
	25	struct i2c_client *client;
51bd6943 MV	26	struct mutex mtx;
	27	};
	28
a9b2899b	29	static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
51bd6943 MV	30	{
51bd6943 MV	31	struct isl_pmic *pmic = rdev_get_drvdata(dev);
a9b2899b	32	int idx;
51bd6943 MV	33
	34	mutex_lock(&pmic->mtx);
	35
	36	idx = i2c_smbus_read_byte(pmic->client);
a9b2899b	37	if (idx < 0)
51bd6943	38	dev_err(&pmic->client->dev, "Error getting voltage\n");
51bd6943	39
51bd6943	40	mutex_unlock(&pmic->mtx);
a9b2899b	41	return idx;
51bd6943 MV	42	}
51bd6943 MV	43
dde2b724 AL	44	static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
dde2b724 AL	45	unsigned selector)
51bd6943 MV	46	{
51bd6943 MV	47	struct isl_pmic *pmic = rdev_get_drvdata(dev);
dde2b724	48	int err;
3a93f2a9	49
51bd6943 MV	50	mutex_lock(&pmic->mtx);
51bd6943 MV	51
dde2b724	52	err = i2c_smbus_write_byte(pmic->client, selector);
51bd6943 MV	53	if (err < 0)
	54	dev_err(&pmic->client->dev, "Error setting voltage\n");
	55
	56	mutex_unlock(&pmic->mtx);
	57	return err;
	58	}
	59
1dceee5e	60	static const struct regulator_ops isl_core_ops = {
a9b2899b	61	.get_voltage_sel = isl6271a_get_voltage_sel,
dde2b724	62	.set_voltage_sel = isl6271a_set_voltage_sel,
2b7a7a4e	63	.list_voltage = regulator_list_voltage_linear,
dde2b724	64	.map_voltage = regulator_map_voltage_linear,
51bd6943 MV	65	};
51bd6943 MV	66
1dceee5e	67	static const struct regulator_ops isl_fixed_ops = {
985f769c	68	.list_voltage = regulator_list_voltage_linear,
51bd6943 MV	69	};
51bd6943 MV	70
4b65e159	71	static const struct regulator_desc isl_rd[] = {
51bd6943 MV	72	{
	73	.name = "Core Buck",
	74	.id = 0,
	75	.n_voltages = 16,
	76	.ops = &isl_core_ops,
	77	.type = REGULATOR_VOLTAGE,
	78	.owner = THIS_MODULE,
2b7a7a4e AL	79	.min_uV = ISL6271A_VOLTAGE_MIN,
2b7a7a4e AL	80	.uV_step = ISL6271A_VOLTAGE_STEP,
51bd6943 MV	81	}, {
	82	.name = "LDO1",
	83	.id = 1,
	84	.n_voltages = 1,
	85	.ops = &isl_fixed_ops,
	86	.type = REGULATOR_VOLTAGE,
	87	.owner = THIS_MODULE,
985f769c	88	.min_uV = 1100000,
51bd6943 MV	89	}, {
	90	.name = "LDO2",
	91	.id = 2,
	92	.n_voltages = 1,
	93	.ops = &isl_fixed_ops,
	94	.type = REGULATOR_VOLTAGE,
	95	.owner = THIS_MODULE,
985f769c	96	.min_uV = 1300000,
51bd6943 MV	97	},
	98	};
	99
69518d21	100	static int isl6271a_probe(struct i2c_client *i2c)
51bd6943	101	{
69518d21	102	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
a6e58299	103	struct regulator_dev *rdev;
c172708d	104	struct regulator_config config = { };
dff91d0b	105	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
51bd6943	106	struct isl_pmic *pmic;
0ab6e8ca	107	int i;
51bd6943 MV	108
	109	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	110	return -EIO;
	111
ef6bd5a3	112	pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
51bd6943 MV	113	if (!pmic)
	114	return -ENOMEM;
	115
	116	pmic->client = i2c;
	117
	118	mutex_init(&pmic->mtx);
	119
	120	for (i = 0; i < 3; i++) {
c172708d MB	121	config.dev = &i2c->dev;
	122	if (i == 0)
	123	config.init_data = init_data;
	124	else
85bea1bf	125	config.init_data = NULL;
c172708d MB	126	config.driver_data = pmic;
c172708d MB	127
a6e58299 AL	128	rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
a6e58299 AL	129	if (IS_ERR(rdev)) {
51bd6943	130	dev_err(&i2c->dev, "failed to register %s\n", id->name);
a6e58299	131	return PTR_ERR(rdev);
51bd6943 MV	132	}
	133	}
	134
	135	i2c_set_clientdata(i2c, pmic);
	136
	137	return 0;
51bd6943 MV	138	}
	139
	140	static const struct i2c_device_id isl6271a_id[] = {
	141	{.name = "isl6271a", 0 },
	142	{ },
	143	};
	144
	145	MODULE_DEVICE_TABLE(i2c, isl6271a_id);
	146
	147	static struct i2c_driver isl6271a_i2c_driver = {
	148	.driver = {
	149	.name = "isl6271a",
51bd6943	150	},
69518d21	151	.probe_new = isl6271a_probe,
51bd6943 MV	152	.id_table = isl6271a_id,
	153	};
	154
	155	static int __init isl6271a_init(void)
	156	{
	157	return i2c_add_driver(&isl6271a_i2c_driver);
	158	}
	159
	160	static void __exit isl6271a_cleanup(void)
	161	{
	162	i2c_del_driver(&isl6271a_i2c_driver);
	163	}
	164
	165	subsys_initcall(isl6271a_init);
	166	module_exit(isl6271a_cleanup);
	167
	168	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	169	MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
	170	MODULE_LICENSE("GPL v2");