diff options
Diffstat (limited to 'drivers/regulator/tps6105x-regulator.c')
| -rw-r--r-- | drivers/regulator/tps6105x-regulator.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/regulator/tps6105x-regulator.c b/drivers/regulator/tps6105x-regulator.c new file mode 100644 index 00000000000..1661499feda --- /dev/null +++ b/drivers/regulator/tps6105x-regulator.c @@ -0,0 +1,196 @@ +/* + * 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 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, ®val); + 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, ®val); + 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 int tps6105x_regulator_list_voltage(struct regulator_dev *rdev, + unsigned selector) +{ + if (selector >= ARRAY_SIZE(tps6105x_voltages)) + return -EINVAL; + + return tps6105x_voltages[selector]; +} + +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 = tps6105x_regulator_list_voltage, +}; + +static 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), +}; + +/* + * Registers the chip as a voltage regulator + */ +static int __devinit tps6105x_regulator_probe(struct platform_device *pdev) +{ + struct tps6105x *tps6105x = mfd_get_data(pdev); + struct tps6105x_platform_data *pdata = tps6105x->pdata; + 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; + } + + /* Register regulator with framework */ + tps6105x->regulator = regulator_register(&tps6105x_regulator_desc, + &tps6105x->client->dev, + pdata->regulator_data, tps6105x); + if (IS_ERR(tps6105x->regulator)) { + ret = PTR_ERR(tps6105x->regulator); + dev_err(&tps6105x->client->dev, + "failed to register regulator\n"); + return ret; + } + + return 0; +} + +static int __devexit tps6105x_regulator_remove(struct platform_device *pdev) +{ + struct tps6105x *tps6105x = platform_get_drvdata(pdev); + 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 = __devexit_p(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"); |