drivers/regulator/mc13xxx-regulator-core.c - kernel/common - Git at Google

 /*
  * 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);

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
 			       mc13xxx_regulators[id].enable_bit,
 			       mc13xxx_regulators[id].enable_bit);
 }

 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);

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
 			       mc13xxx_regulators[id].enable_bit, 0);
 }

 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;

 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
 	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);

 	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
 			       mc13xxx_regulators[id].vsel_mask,
 			       selector << mc13xxx_regulators[id].vsel_shift);
 }

 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);

 	ret = mc13xxx_reg_read(priv->mc13xxx,
 				mc13xxx_regulators[id].vsel_reg, &val);
 	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 mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
 {
 	struct device_node *parent;
 	int num;

 	if (!pdev->dev.parent->of_node)
 		return -ENODEV;

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

 	num = of_get_child_count(parent);
 	of_node_put(parent);
 	return num;
 }
 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);

 struct mc13xxx_regulator_init_data *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, parsed = 0;

 	if (!pdev->dev.parent->of_node)
 		return NULL;

 	parent = of_get_child_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) {
 		of_node_put(parent);
 		return NULL;
 	}

 	p = data;

 	for_each_child_of_node(parent, child) {
 		int found = 0;

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

 				parsed++;
 				found = 1;
 				break;
 			}
 		}

 		if (!found)
 			dev_warn(&pdev->dev,
 				 "Unknown regulator: %s\n", child->name);
 	}
 	of_node_put(parent);

 	priv->num_regulators = parsed;

 	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");
	/*
	* 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);

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
	mc13xxx_regulators[id].enable_bit,
	mc13xxx_regulators[id].enable_bit);
	}

	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);

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
	mc13xxx_regulators[id].enable_bit, 0);
	}

	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;

	ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
	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);

	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
	mc13xxx_regulators[id].vsel_mask,
	selector << mc13xxx_regulators[id].vsel_shift);
	}

	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);

	ret = mc13xxx_reg_read(priv->mc13xxx,
	mc13xxx_regulators[id].vsel_reg, &val);
	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 mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
	{
	struct device_node *parent;
	int num;

	if (!pdev->dev.parent->of_node)
	return -ENODEV;

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

	num = of_get_child_count(parent);
	of_node_put(parent);
	return num;
	}
	EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);

	struct mc13xxx_regulator_init_data *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, parsed = 0;

	if (!pdev->dev.parent->of_node)
	return NULL;

	parent = of_get_child_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) {
	of_node_put(parent);
	return NULL;
	}

	p = data;

	for_each_child_of_node(parent, child) {
	int found = 0;

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

	parsed++;
	found = 1;
	break;
	}
	}

	if (!found)
	dev_warn(&pdev->dev,
	"Unknown regulator: %s\n", child->name);
	}
	of_node_put(parent);

	priv->num_regulators = parsed;

	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");