summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/da9210-regulator.c
blob: 6f5ecbe1132e7da4f02496672578ef2301285767 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/*
 * 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 (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;
	config.init_data = pdata ? &pdata->da9210_constraints :
		of_get_regulator_init_data(dev, dev->of_node);
	config.driver_data = chip;
	config.regmap = chip->regmap;
	config.of_node = dev->of_node;

	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");