243 строки
7.3 KiB
C
243 строки
7.3 KiB
C
/*
|
|
* 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 <linux/module.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");
|