| /* |
| * 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"); |
