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Linux/drivers/regulator/tps6105x-regulator.c

  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 
 23 static const unsigned int tps6105x_voltages[] = {
 24         4500000,
 25         5000000,
 26         5250000,
 27         5000000, /* There is an additional 5V */
 28 };
 29 
 30 static 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 
 45 static 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 
 60 static 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 
 78 static 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 
 93 static 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 
108 static 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 
117 static 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  */
130 static 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 
163 static struct platform_driver tps6105x_regulator_driver = {
164         .driver = {
165                 .name  = "tps6105x-regulator",
166                 .owner = THIS_MODULE,
167         },
168         .probe = tps6105x_regulator_probe,
169 };
170 
171 static __init int tps6105x_regulator_init(void)
172 {
173         return platform_driver_register(&tps6105x_regulator_driver);
174 }
175 subsys_initcall(tps6105x_regulator_init);
176 
177 static __exit void tps6105x_regulator_exit(void)
178 {
179         platform_driver_unregister(&tps6105x_regulator_driver);
180 }
181 module_exit(tps6105x_regulator_exit);
182 
183 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
184 MODULE_DESCRIPTION("TPS6105x regulator driver");
185 MODULE_LICENSE("GPL v2");
186 MODULE_ALIAS("platform:tps6105x-regulator");
187 

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