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/drivers/regulator/tps6105x-regulator.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 197 lines | 148 code | 31 blank | 18 comment | 11 complexity | 4bc8bb4f350d57436bbc273dca7cc94d MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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 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 int tps6105x_regulator_list_voltage(struct regulator_dev *rdev,
109					   unsigned selector)
110{
111	if (selector >= ARRAY_SIZE(tps6105x_voltages))
112		return -EINVAL;
113
114	return tps6105x_voltages[selector];
115}
116
117static struct regulator_ops tps6105x_regulator_ops = {
118	.enable		= tps6105x_regulator_enable,
119	.disable	= tps6105x_regulator_disable,
120	.is_enabled	= tps6105x_regulator_is_enabled,
121	.get_voltage_sel = tps6105x_regulator_get_voltage_sel,
122	.set_voltage_sel = tps6105x_regulator_set_voltage_sel,
123	.list_voltage	= tps6105x_regulator_list_voltage,
124};
125
126static struct regulator_desc tps6105x_regulator_desc = {
127	.name		= "tps6105x-boost",
128	.ops		= &tps6105x_regulator_ops,
129	.type		= REGULATOR_VOLTAGE,
130	.id		= 0,
131	.owner		= THIS_MODULE,
132	.n_voltages	= ARRAY_SIZE(tps6105x_voltages),
133};
134
135/*
136 * Registers the chip as a voltage regulator
137 */
138static int __devinit tps6105x_regulator_probe(struct platform_device *pdev)
139{
140	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
141	struct tps6105x_platform_data *pdata = tps6105x->pdata;
142	int ret;
143
144	/* This instance is not set for regulator mode so bail out */
145	if (pdata->mode != TPS6105X_MODE_VOLTAGE) {
146		dev_info(&pdev->dev,
147			 "chip not in voltage mode mode, exit probe \n");
148		return 0;
149	}
150
151	/* Register regulator with framework */
152	tps6105x->regulator = regulator_register(&tps6105x_regulator_desc,
153					     &tps6105x->client->dev,
154					     pdata->regulator_data, tps6105x);
155	if (IS_ERR(tps6105x->regulator)) {
156		ret = PTR_ERR(tps6105x->regulator);
157		dev_err(&tps6105x->client->dev,
158			"failed to register regulator\n");
159		return ret;
160	}
161	platform_set_drvdata(pdev, tps6105x);
162
163	return 0;
164}
165
166static int __devexit tps6105x_regulator_remove(struct platform_device *pdev)
167{
168	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
169	regulator_unregister(tps6105x->regulator);
170	return 0;
171}
172
173static struct platform_driver tps6105x_regulator_driver = {
174	.driver = {
175		.name  = "tps6105x-regulator",
176		.owner = THIS_MODULE,
177	},
178	.probe = tps6105x_regulator_probe,
179	.remove = __devexit_p(tps6105x_regulator_remove),
180};
181
182static __init int tps6105x_regulator_init(void)
183{
184	return platform_driver_register(&tps6105x_regulator_driver);
185}
186subsys_initcall(tps6105x_regulator_init);
187
188static __exit void tps6105x_regulator_exit(void)
189{
190	platform_driver_unregister(&tps6105x_regulator_driver);
191}
192module_exit(tps6105x_regulator_exit);
193
194MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
195MODULE_DESCRIPTION("TPS6105x regulator driver");
196MODULE_LICENSE("GPL v2");
197MODULE_ALIAS("platform:tps6105x-regulator");