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Diffstat (limited to '')
| -rw-r--r-- | drivers/regulator/mc13xxx-regulator-core.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/regulator/mc13xxx-regulator-core.c b/drivers/regulator/mc13xxx-regulator-core.c new file mode 100644 index 000000000000..2bb5de1f2421 --- /dev/null +++ b/drivers/regulator/mc13xxx-regulator-core.c @@ -0,0 +1,241 @@ +/* + * Regulator Driver for Freescale MC13xxx PMIC + * + * Copyright 2010 Yong Shen <yong.shen@linaro.org> + * + * Based on mc13783 regulator driver : + * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> + * Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file + * from freescale + */ + +#include <linux/mfd/mc13xxx.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/driver.h> +#include <linux/platform_device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/err.h> +#include "mc13xxx.h" + +static int mc13xxx_regulator_enable(struct regulator_dev *rdev) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int id = rdev_get_id(rdev); + int ret; + + dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); + + mc13xxx_lock(priv->mc13xxx); + ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, + mc13xxx_regulators[id].enable_bit, + mc13xxx_regulators[id].enable_bit); + mc13xxx_unlock(priv->mc13xxx); + + return ret; +} + +static int mc13xxx_regulator_disable(struct regulator_dev *rdev) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int id = rdev_get_id(rdev); + int ret; + + dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); + + mc13xxx_lock(priv->mc13xxx); + ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, + mc13xxx_regulators[id].enable_bit, 0); + mc13xxx_unlock(priv->mc13xxx); + + return ret; +} + +static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int ret, id = rdev_get_id(rdev); + unsigned int val; + + mc13xxx_lock(priv->mc13xxx); + ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); + mc13xxx_unlock(priv->mc13xxx); + + if (ret) + return ret; + + return (val & mc13xxx_regulators[id].enable_bit) != 0; +} + +int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev, + unsigned selector) +{ + int id = rdev_get_id(rdev); + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + + if (selector >= mc13xxx_regulators[id].desc.n_voltages) + return -EINVAL; + + return mc13xxx_regulators[id].voltages[selector]; +} +EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage); + +int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int reg_id = rdev_get_id(rdev); + int i; + int bestmatch; + int bestindex; + + /* + * Locate the minimum voltage fitting the criteria on + * this regulator. The switchable voltages are not + * in strict falling order so we need to check them + * all for the best match. + */ + bestmatch = INT_MAX; + bestindex = -1; + for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) { + if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV && + mc13xxx_regulators[reg_id].voltages[i] < bestmatch) { + bestmatch = mc13xxx_regulators[reg_id].voltages[i]; + bestindex = i; + } + } + + if (bestindex < 0 || bestmatch > max_uV) { + dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n", + min_uV, max_uV); + return -EINVAL; + } + return bestindex; +} +EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index); + +static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, + int max_uV, unsigned *selector) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int value, id = rdev_get_id(rdev); + int ret; + + dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", + __func__, id, min_uV, max_uV); + + /* Find the best index */ + value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV); + dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value); + if (value < 0) + return value; + + mc13xxx_lock(priv->mc13xxx); + ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, + mc13xxx_regulators[id].vsel_mask, + value << mc13xxx_regulators[id].vsel_shift); + mc13xxx_unlock(priv->mc13xxx); + + return ret; +} + +static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int ret, id = rdev_get_id(rdev); + unsigned int val; + + dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); + + mc13xxx_lock(priv->mc13xxx); + ret = mc13xxx_reg_read(priv->mc13xxx, + mc13xxx_regulators[id].vsel_reg, &val); + mc13xxx_unlock(priv->mc13xxx); + + if (ret) + return ret; + + val = (val & mc13xxx_regulators[id].vsel_mask) + >> mc13xxx_regulators[id].vsel_shift; + + dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); + + BUG_ON(val > mc13xxx_regulators[id].desc.n_voltages); + + return mc13xxx_regulators[id].voltages[val]; +} + +struct regulator_ops mc13xxx_regulator_ops = { + .enable = mc13xxx_regulator_enable, + .disable = mc13xxx_regulator_disable, + .is_enabled = mc13xxx_regulator_is_enabled, + .list_voltage = mc13xxx_regulator_list_voltage, + .set_voltage = mc13xxx_regulator_set_voltage, + .get_voltage = mc13xxx_regulator_get_voltage, +}; +EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); + +int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, + int max_uV, unsigned *selector) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int id = rdev_get_id(rdev); + + dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", + __func__, id, min_uV, max_uV); + + if (min_uV >= mc13xxx_regulators[id].voltages[0] && + max_uV <= mc13xxx_regulators[id].voltages[0]) + return 0; + else + return -EINVAL; +} +EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); + +int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev) +{ + struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); + struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; + int id = rdev_get_id(rdev); + + dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); + + return mc13xxx_regulators[id].voltages[0]; +} +EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage); + +struct regulator_ops mc13xxx_fixed_regulator_ops = { + .enable = mc13xxx_regulator_enable, + .disable = mc13xxx_regulator_disable, + .is_enabled = mc13xxx_regulator_is_enabled, + .list_voltage = mc13xxx_regulator_list_voltage, + .set_voltage = mc13xxx_fixed_regulator_set_voltage, + .get_voltage = mc13xxx_fixed_regulator_get_voltage, +}; +EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); + +int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev) +{ + return 1; +} +EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); +MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); +MODULE_ALIAS("mc13xxx-regulator-core"); |