1/*
2 * Driver for TPS61050/61052 boost converters, typically used for white LEDs
3 * or audio amplifiers.
4 *
5 * Copyright (C) 2011 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
7 *
8 * Author: Linus Walleij <linus.walleij@linaro.org>
9 *
10 * License terms: GNU General Public License (GPL) version 2
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/err.h>
17#include <linux/i2c.h>
18#include <linux/platform_device.h>
19#include <linux/regulator/driver.h>
20#include <linux/mfd/core.h>
21#include <linux/mfd/tps6105x.h>
22
23static const unsigned int tps6105x_voltages[] = {
24	4500000,
25	5000000,
26	5250000,
27	5000000, /* There is an additional 5V */
28};
29
30static int tps6105x_regulator_enable(struct regulator_dev *rdev)
31{
32	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
33	int ret;
34
35	/* Activate voltage mode */
36	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
37		TPS6105X_REG0_MODE_MASK,
38		TPS6105X_REG0_MODE_VOLTAGE << TPS6105X_REG0_MODE_SHIFT);
39	if (ret)
40		return ret;
41
42	return 0;
43}
44
45static int tps6105x_regulator_disable(struct regulator_dev *rdev)
46{
47	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
48	int ret;
49
50	/* Set into shutdown mode */
51	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
52		TPS6105X_REG0_MODE_MASK,
53		TPS6105X_REG0_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
54	if (ret)
55		return ret;
56
57	return 0;
58}
59
60static int tps6105x_regulator_is_enabled(struct regulator_dev *rdev)
61{
62	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
63	u8 regval;
64	int ret;
65
66	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
67	if (ret)
68		return ret;
69	regval &= TPS6105X_REG0_MODE_MASK;
70	regval >>= TPS6105X_REG0_MODE_SHIFT;
71
72	if (regval == TPS6105X_REG0_MODE_VOLTAGE)
73		return 1;
74
75	return 0;
76}
77
78static int tps6105x_regulator_get_voltage_sel(struct regulator_dev *rdev)
79{
80	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
81	u8 regval;
82	int ret;
83
84	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
85	if (ret)
86		return ret;
87
88	regval &= TPS6105X_REG0_VOLTAGE_MASK;
89	regval >>= TPS6105X_REG0_VOLTAGE_SHIFT;
90	return (int) regval;
91}
92
93static int tps6105x_regulator_set_voltage_sel(struct regulator_dev *rdev,
94					      unsigned selector)
95{
96	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
97	int ret;
98
99	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
100				    TPS6105X_REG0_VOLTAGE_MASK,
101				    selector << TPS6105X_REG0_VOLTAGE_SHIFT);
102	if (ret)
103		return ret;
104
105	return 0;
106}
107
108static struct regulator_ops tps6105x_regulator_ops = {
109	.enable		= tps6105x_regulator_enable,
110	.disable	= tps6105x_regulator_disable,
111	.is_enabled	= tps6105x_regulator_is_enabled,
112	.get_voltage_sel = tps6105x_regulator_get_voltage_sel,
113	.set_voltage_sel = tps6105x_regulator_set_voltage_sel,
114	.list_voltage	= regulator_list_voltage_table,
115};
116
117static const struct regulator_desc tps6105x_regulator_desc = {
118	.name		= "tps6105x-boost",
119	.ops		= &tps6105x_regulator_ops,
120	.type		= REGULATOR_VOLTAGE,
121	.id		= 0,
122	.owner		= THIS_MODULE,
123	.n_voltages	= ARRAY_SIZE(tps6105x_voltages),
124	.volt_table	= tps6105x_voltages,
125};
126
127/*
128 * Registers the chip as a voltage regulator
129 */
130static int tps6105x_regulator_probe(struct platform_device *pdev)
131{
132	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
133	struct tps6105x_platform_data *pdata = tps6105x->pdata;
134	struct regulator_config config = { };
135	int ret;
136
137	/* This instance is not set for regulator mode so bail out */
138	if (pdata->mode != TPS6105X_MODE_VOLTAGE) {
139		dev_info(&pdev->dev,
140			"chip not in voltage mode mode, exit probe\n");
141		return 0;
142	}
143
144	config.dev = &tps6105x->client->dev;
145	config.init_data = pdata->regulator_data;
146	config.driver_data = tps6105x;
147
148	/* Register regulator with framework */
149	tps6105x->regulator = devm_regulator_register(&pdev->dev,
150						      &tps6105x_regulator_desc,
151						      &config);
152	if (IS_ERR(tps6105x->regulator)) {
153		ret = PTR_ERR(tps6105x->regulator);
154		dev_err(&tps6105x->client->dev,
155			"failed to register regulator\n");
156		return ret;
157	}
158	platform_set_drvdata(pdev, tps6105x);
159
160	return 0;
161}
162
163static struct platform_driver tps6105x_regulator_driver = {
164	.driver = {
165		.name  = "tps6105x-regulator",
166	},
167	.probe = tps6105x_regulator_probe,
168};
169
170static __init int tps6105x_regulator_init(void)
171{
172	return platform_driver_register(&tps6105x_regulator_driver);
173}
174subsys_initcall(tps6105x_regulator_init);
175
176static __exit void tps6105x_regulator_exit(void)
177{
178	platform_driver_unregister(&tps6105x_regulator_driver);
179}
180module_exit(tps6105x_regulator_exit);
181
182MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
183MODULE_DESCRIPTION("TPS6105x regulator driver");
184MODULE_LICENSE("GPL v2");
185MODULE_ALIAS("platform:tps6105x-regulator");
186