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/regmap.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 = regmap_update_bits(tps6105x->regmap, 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 = regmap_update_bits(tps6105x->regmap, 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         unsigned int regval;
  64         int ret;
  65
  66         ret = regmap_read(tps6105x->regmap, 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         unsigned int regval;
  82         int ret;
  83
  84         ret = regmap_read(tps6105x->regmap, 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 = regmap_update_bits(tps6105x->regmap, 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         },
 167         .probe = tps6105x_regulator_probe,
 168 };
 169
 170 static __init int tps6105x_regulator_init(void)
 171 {
 172         return platform_driver_register(&tps6105x_regulator_driver);
 173 }
 174 subsys_initcall(tps6105x_regulator_init);
 175
 176 static __exit void tps6105x_regulator_exit(void)
 177 {
 178         platform_driver_unregister(&tps6105x_regulator_driver);
 179 }
 180 module_exit(tps6105x_regulator_exit);
 181
 182 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
 183 MODULE_DESCRIPTION("TPS6105x regulator driver");
 184 MODULE_LICENSE("GPL v2");
 185 MODULE_ALIAS("platform:tps6105x-regulator");