summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/tps6105x-regulator.c
blob: ec9453ffb77fd561ec1c2d6c3591b7302bc16b5f (plain)
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
192
193
/*
 * Driver for TPS61050/61052 boost converters, typically used for white LEDs
 * or audio amplifiers.
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6105x.h>

static const unsigned int tps6105x_voltages[] = {
	4500000,
	5000000,
	5250000,
	5000000, /* There is an additional 5V */
};

static int tps6105x_regulator_enable(struct regulator_dev *rdev)
{
	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
	int ret;

	/* Activate voltage mode */
	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
		TPS6105X_REG0_MODE_MASK,
		TPS6105X_REG0_MODE_VOLTAGE << TPS6105X_REG0_MODE_SHIFT);
	if (ret)
		return ret;

	return 0;
}

static int tps6105x_regulator_disable(struct regulator_dev *rdev)
{
	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
	int ret;

	/* Set into shutdown mode */
	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
		TPS6105X_REG0_MODE_MASK,
		TPS6105X_REG0_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
	if (ret)
		return ret;

	return 0;
}

static int tps6105x_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
	u8 regval;
	int ret;

	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
	if (ret)
		return ret;
	regval &= TPS6105X_REG0_MODE_MASK;
	regval >>= TPS6105X_REG0_MODE_SHIFT;

	if (regval == TPS6105X_REG0_MODE_VOLTAGE)
		return 1;

	return 0;
}

static int tps6105x_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
	u8 regval;
	int ret;

	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
	if (ret)
		return ret;

	regval &= TPS6105X_REG0_VOLTAGE_MASK;
	regval >>= TPS6105X_REG0_VOLTAGE_SHIFT;
	return (int) regval;
}

static int tps6105x_regulator_set_voltage_sel(struct regulator_dev *rdev,
					      unsigned selector)
{
	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
	int ret;

	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
				    TPS6105X_REG0_VOLTAGE_MASK,
				    selector << TPS6105X_REG0_VOLTAGE_SHIFT);
	if (ret)
		return ret;

	return 0;
}

static struct regulator_ops tps6105x_regulator_ops = {
	.enable		= tps6105x_regulator_enable,
	.disable	= tps6105x_regulator_disable,
	.is_enabled	= tps6105x_regulator_is_enabled,
	.get_voltage_sel = tps6105x_regulator_get_voltage_sel,
	.set_voltage_sel = tps6105x_regulator_set_voltage_sel,
	.list_voltage	= regulator_list_voltage_table,
};

static const struct regulator_desc tps6105x_regulator_desc = {
	.name		= "tps6105x-boost",
	.ops		= &tps6105x_regulator_ops,
	.type		= REGULATOR_VOLTAGE,
	.id		= 0,
	.owner		= THIS_MODULE,
	.n_voltages	= ARRAY_SIZE(tps6105x_voltages),
	.volt_table	= tps6105x_voltages,
};

/*
 * Registers the chip as a voltage regulator
 */
static int tps6105x_regulator_probe(struct platform_device *pdev)
{
	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
	struct tps6105x_platform_data *pdata = tps6105x->pdata;
	struct regulator_config config = { };
	int ret;

	/* This instance is not set for regulator mode so bail out */
	if (pdata->mode != TPS6105X_MODE_VOLTAGE) {
		dev_info(&pdev->dev,
			 "chip not in voltage mode mode, exit probe \n");
		return 0;
	}

	config.dev = &tps6105x->client->dev;
	config.init_data = pdata->regulator_data;
	config.driver_data = tps6105x;

	/* Register regulator with framework */
	tps6105x->regulator = regulator_register(&tps6105x_regulator_desc,
						 &config);
	if (IS_ERR(tps6105x->regulator)) {
		ret = PTR_ERR(tps6105x->regulator);
		dev_err(&tps6105x->client->dev,
			"failed to register regulator\n");
		return ret;
	}
	platform_set_drvdata(pdev, tps6105x);

	return 0;
}

static int tps6105x_regulator_remove(struct platform_device *pdev)
{
	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
	regulator_unregister(tps6105x->regulator);
	return 0;
}

static struct platform_driver tps6105x_regulator_driver = {
	.driver = {
		.name  = "tps6105x-regulator",
		.owner = THIS_MODULE,
	},
	.probe = tps6105x_regulator_probe,
	.remove = tps6105x_regulator_remove,
};

static __init int tps6105x_regulator_init(void)
{
	return platform_driver_register(&tps6105x_regulator_driver);
}
subsys_initcall(tps6105x_regulator_init);

static __exit void tps6105x_regulator_exit(void)
{
	platform_driver_unregister(&tps6105x_regulator_driver);
}
module_exit(tps6105x_regulator_exit);

MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("TPS6105x regulator driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps6105x-regulator");