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