mc13xxx-regulator-core.c

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/*
 * Regulator Driver for Freescale MC13xxx PMIC
 *
 * Copyright 2010 Yong Shen <[email protected]>
 *
 * Based on mc13783 regulator driver :
 * Copyright (C) 2008 Sascha Hauer, Pengutronix <[email protected]>
 * Copyright 2009 Alberto Panizzo <[email protected]>
 *
 * 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/regulator/of_regulator.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 <linux/of.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;
}

static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
                         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);
    int ret;

    mc13xxx_lock(priv->mc13xxx);
    ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
            mc13xxx_regulators[id].vsel_mask,
            selector << 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 rdev->desc->volt_table[val];
}

struct regulator_ops mc13xxx_regulator_ops = {
    .enable = mc13xxx_regulator_enable,
    .disable = mc13xxx_regulator_disable,
    .is_enabled = mc13xxx_regulator_is_enabled,
    .list_voltage = regulator_list_voltage_table,
    .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
    .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)
{
    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 <= rdev->desc->volt_table[0] &&
        rdev->desc->volt_table[0] <= max_uV) {
        *selector = 0;
        return 0;
    } else {
        return -EINVAL;
    }
}
EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);

struct regulator_ops mc13xxx_fixed_regulator_ops = {
    .enable = mc13xxx_regulator_enable,
    .disable = mc13xxx_regulator_disable,
    .is_enabled = mc13xxx_regulator_is_enabled,
    .list_voltage = regulator_list_voltage_table,
    .set_voltage = mc13xxx_fixed_regulator_set_voltage,
};
EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);

#ifdef CONFIG_OF
int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
{
    struct device_node *parent, *child;
    int num = 0;

    of_node_get(pdev->dev.parent->of_node);
    parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
    if (!parent)
        return -ENODEV;

    for_each_child_of_node(parent, child)
        num++;

    return num;
}
EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);

struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt(
    struct platform_device *pdev, struct mc13xxx_regulator *regulators,
    int num_regulators)
{
    struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
    struct mc13xxx_regulator_init_data *data, *p;
    struct device_node *parent, *child;
    int i;

    of_node_get(pdev->dev.parent->of_node);
    parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
    if (!parent)
        return NULL;

    data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
                GFP_KERNEL);
    if (!data)
        return NULL;
    p = data;

    for_each_child_of_node(parent, child) {
        for (i = 0; i < num_regulators; i++) {
            if (!of_node_cmp(child->name,
                     regulators[i].desc.name)) {
                p->id = i;
                p->init_data = of_get_regulator_init_data(
                            &pdev->dev, child);
                p->node = child;
                p++;
                break;
            }
        }
    }

    return data;
}
EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
#endif

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Yong Shen <[email protected]>");
MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
MODULE_ALIAS("mc13xxx-regulator-core");