241 lines
6.5 KiB
C
241 lines
6.5 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/regulator/of_regulator.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 <linux/module.h>
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#include <linux/of.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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static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
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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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int ret;
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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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selector << 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 rdev->desc->volt_table[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 = regulator_list_voltage_table,
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.set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
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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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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 <= rdev->desc->volt_table[0] &&
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rdev->desc->volt_table[0] <= max_uV) {
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*selector = 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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}
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EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_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 = regulator_list_voltage_table,
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.set_voltage = mc13xxx_fixed_regulator_set_voltage,
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};
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EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
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#ifdef CONFIG_OF
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int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
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{
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struct device_node *parent;
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int num;
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of_node_get(pdev->dev.parent->of_node);
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parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
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if (!parent)
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return -ENODEV;
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num = of_get_child_count(parent);
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of_node_put(parent);
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return num;
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}
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EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
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struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
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struct platform_device *pdev, struct mc13xxx_regulator *regulators,
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int num_regulators)
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{
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struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
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struct mc13xxx_regulator_init_data *data, *p;
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struct device_node *parent, *child;
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int i, parsed = 0;
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of_node_get(pdev->dev.parent->of_node);
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parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
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if (!parent)
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return NULL;
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data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
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GFP_KERNEL);
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if (!data) {
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of_node_put(parent);
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return NULL;
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}
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p = data;
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for_each_child_of_node(parent, child) {
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int found = 0;
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for (i = 0; i < num_regulators; i++) {
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if (!regulators[i].desc.name)
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continue;
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if (!of_node_cmp(child->name,
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regulators[i].desc.name)) {
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p->id = i;
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p->init_data = of_get_regulator_init_data(
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&pdev->dev, child);
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p->node = child;
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p++;
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parsed++;
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found = 1;
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break;
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}
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}
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if (!found)
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dev_warn(&pdev->dev,
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"Unknown regulator: %s\n", child->name);
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}
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of_node_put(parent);
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priv->num_regulators = parsed;
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return data;
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}
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EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
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#endif
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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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