[linux-2.6-block.git] / drivers / regulator / da9210-regulator.c

/*
 * da9210-regulator.c - Regulator device driver for DA9210
 * Copyright (C) 2013  Dialog Semiconductor Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>

#include "da9210-regulator.h"

struct da9210 {
	struct regulator_dev *rdev;
	struct regmap *regmap;
};

static const struct regmap_config da9210_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
				    int max_uA);
static int da9210_get_current_limit(struct regulator_dev *rdev);

static struct regulator_ops da9210_buck_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_current_limit = da9210_set_current_limit,
	.get_current_limit = da9210_get_current_limit,
};

/* Default limits measured in millivolts and milliamps */
#define DA9210_MIN_MV		300
#define DA9210_MAX_MV		1570
#define DA9210_STEP_MV		10

/* Current limits for buck (uA) indices corresponds with register values */
static const int da9210_buck_limits[] = {
	1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
	3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
};

static const struct regulator_desc da9210_reg = {
	.name = "DA9210",
	.id = 0,
	.ops = &da9210_buck_ops,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
	.min_uV = (DA9210_MIN_MV * 1000),
	.uV_step = (DA9210_STEP_MV * 1000),
	.vsel_reg = DA9210_REG_VBUCK_A,
	.vsel_mask = DA9210_VBUCK_MASK,
	.enable_reg = DA9210_REG_BUCK_CONT,
	.enable_mask = DA9210_BUCK_EN,
	.owner = THIS_MODULE,
};

static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
				    int max_uA)
{
	struct da9210 *chip = rdev_get_drvdata(rdev);
	unsigned int sel;
	int i;

	/* search for closest to maximum */
	for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
		if (min_uA <= da9210_buck_limits[i] &&
		    max_uA >= da9210_buck_limits[i]) {
			sel = i;
			sel = sel << DA9210_BUCK_ILIM_SHIFT;
			return regmap_update_bits(chip->regmap,
						  DA9210_REG_BUCK_ILIM,
						  DA9210_BUCK_ILIM_MASK, sel);
		}
	}

	return -EINVAL;
}

static int da9210_get_current_limit(struct regulator_dev *rdev)
{
	struct da9210 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	unsigned int sel;
	int ret;

	ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
	if (ret < 0)
		return ret;

	/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
	sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;

	return da9210_buck_limits[sel];
}

/*
 * I2C driver interface functions
 */
static int da9210_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct da9210 *chip;
	struct device *dev = &i2c->dev;
	struct da9210_pdata *pdata = dev_get_platdata(dev);
	struct regulator_dev *rdev = NULL;
	struct regulator_config config = { };
	int error;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
	if (IS_ERR(chip->regmap)) {
		error = PTR_ERR(chip->regmap);
		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
			error);
		return error;
	}

	config.dev = &i2c->dev;
	config.init_data = pdata ? &pdata->da9210_constraints :
		of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
	config.driver_data = chip;
	config.regmap = chip->regmap;
	config.of_node = dev->of_node;

	/* Mask all interrupt sources to deassert interrupt line */
	error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
	if (!error)
		error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
	if (error) {
		dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
		return error;
	}

	rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
	if (IS_ERR(rdev)) {
		dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
		return PTR_ERR(rdev);
	}

	chip->rdev = rdev;

	i2c_set_clientdata(i2c, chip);

	return 0;
}

static const struct i2c_device_id da9210_i2c_id[] = {
	{"da9210", 0},
	{},
};

MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);

static struct i2c_driver da9210_regulator_driver = {
	.driver = {
		.name = "da9210",
		.owner = THIS_MODULE,
	},
	.probe = da9210_i2c_probe,
	.id_table = da9210_i2c_id,
};

module_i2c_driver(da9210_regulator_driver);

MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
16f10918 ST	1	/*
	2	* da9210-regulator.c - Regulator device driver for DA9210
	3	* Copyright (C) 2013 Dialog Semiconductor Ltd.
	4	*
	5	* This library is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU Library General Public
	7	* License as published by the Free Software Foundation; either
	8	* version 2 of the License, or (at your option) any later version.
	9	*
	10	* This library is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* Library General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU Library General Public
	16	* License along with this library; if not, write to the
	17	* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
	18	* Boston, MA 02110-1301, USA.
	19	*/
	20
	21	#include <linux/err.h>
	22	#include <linux/i2c.h>
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/slab.h>
	26	#include <linux/regulator/driver.h>
	27	#include <linux/regulator/machine.h>
937433c2	28	#include <linux/regulator/of_regulator.h>
16f10918 ST	29	#include <linux/regmap.h>
	30
	31	#include "da9210-regulator.h"
	32
	33	struct da9210 {
	34	struct regulator_dev *rdev;
	35	struct regmap *regmap;
	36	};
	37
	38	static const struct regmap_config da9210_regmap_config = {
	39	.reg_bits = 8,
	40	.val_bits = 8,
	41	};
	42
	43	static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
	44	int max_uA);
	45	static int da9210_get_current_limit(struct regulator_dev *rdev);
	46
	47	static struct regulator_ops da9210_buck_ops = {
	48	.enable = regulator_enable_regmap,
	49	.disable = regulator_disable_regmap,
	50	.is_enabled = regulator_is_enabled_regmap,
	51	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	52	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	53	.list_voltage = regulator_list_voltage_linear,
	54	.set_current_limit = da9210_set_current_limit,
	55	.get_current_limit = da9210_get_current_limit,
	56	};
	57
	58	/* Default limits measured in millivolts and milliamps */
	59	#define DA9210_MIN_MV 300
	60	#define DA9210_MAX_MV 1570
	61	#define DA9210_STEP_MV 10
	62
	63	/* Current limits for buck (uA) indices corresponds with register values */
	64	static const int da9210_buck_limits[] = {
	65	1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
	66	3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
	67	};
	68
	69	static const struct regulator_desc da9210_reg = {
	70	.name = "DA9210",
	71	.id = 0,
	72	.ops = &da9210_buck_ops,
	73	.type = REGULATOR_VOLTAGE,
	74	.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
	75	.min_uV = (DA9210_MIN_MV * 1000),
	76	.uV_step = (DA9210_STEP_MV * 1000),
	77	.vsel_reg = DA9210_REG_VBUCK_A,
	78	.vsel_mask = DA9210_VBUCK_MASK,
	79	.enable_reg = DA9210_REG_BUCK_CONT,
	80	.enable_mask = DA9210_BUCK_EN,
	81	.owner = THIS_MODULE,
	82	};
	83
	84	static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
	85	int max_uA)
	86	{
	87	struct da9210 *chip = rdev_get_drvdata(rdev);
	88	unsigned int sel;
	89	int i;
	90
	91	/* search for closest to maximum */
	92	for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
93	if (min_uA <= da9210_buck_limits[i] &&
94	max_uA >= da9210_buck_limits[i]) {
95	sel = i;
96	sel = sel << DA9210_BUCK_ILIM_SHIFT;
97	return regmap_update_bits(chip->regmap,
98	DA9210_REG_BUCK_ILIM,
99	DA9210_BUCK_ILIM_MASK, sel);
100	}
101	}
102
103	return -EINVAL;
104	}
105
106	static int da9210_get_current_limit(struct regulator_dev *rdev)
107	{
108	struct da9210 *chip = rdev_get_drvdata(rdev);
109	unsigned int data;
110	unsigned int sel;
111	int ret;
112
113	ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
114	if (ret < 0)
115	return ret;
116
117	/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
118	sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
119
120	return da9210_buck_limits[sel];
121	}
122
123	/*
124	* I2C driver interface functions
125	*/
126	static int da9210_i2c_probe(struct i2c_client *i2c,
127	const struct i2c_device_id *id)
128	{
129	struct da9210 *chip;
937433c2 GL	130	struct device *dev = &i2c->dev;
937433c2 GL	131	struct da9210_pdata *pdata = dev_get_platdata(dev);
16f10918 ST	132	struct regulator_dev *rdev = NULL;
	133	struct regulator_config config = { };
	134	int error;
	135
	136	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
6c48acfb	137	if (!chip)
16f10918	138	return -ENOMEM;
16f10918 ST	139
	140	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
	141	if (IS_ERR(chip->regmap)) {
	142	error = PTR_ERR(chip->regmap);
	143	dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
	144	error);
	145	return error;
	146	}
	147
	148	config.dev = &i2c->dev;
937433c2	149	config.init_data = pdata ? &pdata->da9210_constraints :
072e78b1	150	of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
16f10918 ST	151	config.driver_data = chip;
16f10918 ST	152	config.regmap = chip->regmap;
937433c2	153	config.of_node = dev->of_node;
16f10918	154
4d9cbff5 GU	155	/* Mask all interrupt sources to deassert interrupt line */
	156	error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
	157	if (!error)
	158	error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
	159	if (error) {
	160	dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
	161	return error;
	162	}
	163
11c0da7b	164	rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
16f10918 ST	165	if (IS_ERR(rdev)) {
	166	dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
	167	return PTR_ERR(rdev);
	168	}
	169
	170	chip->rdev = rdev;
	171
	172	i2c_set_clientdata(i2c, chip);
	173
	174	return 0;
	175	}
	176
16f10918 ST	177	static const struct i2c_device_id da9210_i2c_id[] = {
	178	{"da9210", 0},
	179	{},
	180	};
	181
	182	MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
	183
	184	static struct i2c_driver da9210_regulator_driver = {
	185	.driver = {
	186	.name = "da9210",
	187	.owner = THIS_MODULE,
	188	},
	189	.probe = da9210_i2c_probe,
16f10918 ST	190	.id_table = da9210_i2c_id,
	191	};
	192
	193	module_i2c_driver(da9210_regulator_driver);
	194
	195	MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
	196	MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
	197	MODULE_LICENSE("GPL v2");