[deliverable/linux.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/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 da9210_pdata *pdata = i2c->dev.platform_data;
	struct regulator_dev *rdev = NULL;
	struct regulator_config config = { };
	int error;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
	if (NULL == chip) {
		dev_err(&i2c->dev,
			"Cannot kzalloc memory for regulator structure\n");
		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;
	if (pdata)
		config.init_data = &pdata->da9210_constraints;
	config.driver_data = chip;
	config.regmap = chip->regmap;

	rdev = regulator_register(&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 int da9210_i2c_remove(struct i2c_client *i2c)
{
	struct da9210 *chip = i2c_get_clientdata(i2c);
	regulator_unregister(chip->rdev);
	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,
	.remove = da9210_i2c_remove,
	.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>
	28	#include <linux/regmap.h>
	29
	30	#include "da9210-regulator.h"
	31
	32	struct da9210 {
	33	struct regulator_dev *rdev;
	34	struct regmap *regmap;
	35	};
	36
	37	static const struct regmap_config da9210_regmap_config = {
	38	.reg_bits = 8,
	39	.val_bits = 8,
	40	};
	41
	42	static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
	43	int max_uA);
	44	static int da9210_get_current_limit(struct regulator_dev *rdev);
	45
	46	static struct regulator_ops da9210_buck_ops = {
	47	.enable = regulator_enable_regmap,
	48	.disable = regulator_disable_regmap,
	49	.is_enabled = regulator_is_enabled_regmap,
	50	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	51	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	52	.list_voltage = regulator_list_voltage_linear,
	53	.set_current_limit = da9210_set_current_limit,
	54	.get_current_limit = da9210_get_current_limit,
	55	};
	56
	57	/* Default limits measured in millivolts and milliamps */
	58	#define DA9210_MIN_MV 300
	59	#define DA9210_MAX_MV 1570
	60	#define DA9210_STEP_MV 10
	61
	62	/* Current limits for buck (uA) indices corresponds with register values */
	63	static const int da9210_buck_limits[] = {
	64	1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
65	3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
66	};
67
68	static const struct regulator_desc da9210_reg = {
69	.name = "DA9210",
70	.id = 0,
71	.ops = &da9210_buck_ops,
72	.type = REGULATOR_VOLTAGE,
73	.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
74	.min_uV = (DA9210_MIN_MV * 1000),
75	.uV_step = (DA9210_STEP_MV * 1000),
76	.vsel_reg = DA9210_REG_VBUCK_A,
77	.vsel_mask = DA9210_VBUCK_MASK,
78	.enable_reg = DA9210_REG_BUCK_CONT,
79	.enable_mask = DA9210_BUCK_EN,
80	.owner = THIS_MODULE,
81	};
82
83	static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
84	int max_uA)
85	{
86	struct da9210 *chip = rdev_get_drvdata(rdev);
87	unsigned int sel;
88	int i;
89
90	/* search for closest to maximum */
91	for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
92	if (min_uA <= da9210_buck_limits[i] &&
93	max_uA >= da9210_buck_limits[i]) {
94	sel = i;
95	sel = sel << DA9210_BUCK_ILIM_SHIFT;
96	return regmap_update_bits(chip->regmap,
97	DA9210_REG_BUCK_ILIM,
98	DA9210_BUCK_ILIM_MASK, sel);
99	}
100	}
101
102	return -EINVAL;
103	}
104
105	static int da9210_get_current_limit(struct regulator_dev *rdev)
106	{
107	struct da9210 *chip = rdev_get_drvdata(rdev);
108	unsigned int data;
109	unsigned int sel;
110	int ret;
111
112	ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
113	if (ret < 0)
114	return ret;
115
116	/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
117	sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
118
119	return da9210_buck_limits[sel];
120	}
121
122	/*
123	* I2C driver interface functions
124	*/
125	static int da9210_i2c_probe(struct i2c_client *i2c,
126	const struct i2c_device_id *id)
127	{
128	struct da9210 *chip;
129	struct da9210_pdata *pdata = i2c->dev.platform_data;
130	struct regulator_dev *rdev = NULL;
131	struct regulator_config config = { };
132	int error;
133
134	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
135	if (NULL == chip) {
136	dev_err(&i2c->dev,
137	"Cannot kzalloc memory for regulator structure\n");
138	return -ENOMEM;
139	}
140
141	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
142	if (IS_ERR(chip->regmap)) {
143	error = PTR_ERR(chip->regmap);
144	dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
145	error);
146	return error;
147	}
148
149	config.dev = &i2c->dev;
150	if (pdata)
151	config.init_data = &pdata->da9210_constraints;
152	config.driver_data = chip;
153	config.regmap = chip->regmap;
154
155	rdev = regulator_register(&da9210_reg, &config);
156	if (IS_ERR(rdev)) {
157	dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
158	return PTR_ERR(rdev);
159	}
160
161	chip->rdev = rdev;
162
163	i2c_set_clientdata(i2c, chip);
164
165	return 0;
166	}
167
168	static int da9210_i2c_remove(struct i2c_client *i2c)
169	{
170	struct da9210 *chip = i2c_get_clientdata(i2c);
171	regulator_unregister(chip->rdev);
172	return 0;
173	}
174
175	static const struct i2c_device_id da9210_i2c_id[] = {
176	{"da9210", 0},
177	{},
178	};
179
180	MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
181
182	static struct i2c_driver da9210_regulator_driver = {
183	.driver = {
184	.name = "da9210",
185	.owner = THIS_MODULE,
186	},
187	.probe = da9210_i2c_probe,
188	.remove = da9210_i2c_remove,
189	.id_table = da9210_i2c_id,
190	};
191
192	module_i2c_driver(da9210_regulator_driver);
193
194	MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
195	MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
196	MODULE_LICENSE("GPL v2");