[linux-2.6-block.git] / drivers / regulator / mc13xxx-regulator-core.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/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 <yong.shen@linaro.org>");
MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
MODULE_ALIAS("mc13xxx-regulator-core");
Commit	Line	Data
167e3d8a YS	1	/*
	2	* Regulator Driver for Freescale MC13xxx PMIC
	3	*
	4	* Copyright 2010 Yong Shen <yong.shen@linaro.org>
	5	*
	6	* Based on mc13783 regulator driver :
	7	* Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
	8	* Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	* Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
	15	* from freescale
	16	*/
	17
	18	#include <linux/mfd/mc13xxx.h>
	19	#include <linux/regulator/machine.h>
	20	#include <linux/regulator/driver.h>
93bcb23b	21	#include <linux/regulator/of_regulator.h>
167e3d8a YS	22	#include <linux/platform_device.h>
	23	#include <linux/kernel.h>
	24	#include <linux/slab.h>
	25	#include <linux/init.h>
	26	#include <linux/err.h>
65602c32	27	#include <linux/module.h>
93bcb23b	28	#include <linux/of.h>
167e3d8a YS	29	#include "mc13xxx.h"
	30
	31	static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
	32	{
	33	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	34	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	35	int id = rdev_get_id(rdev);
167e3d8a YS	36
	37	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	38
7dd33c1d AS	39	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
	40	mc13xxx_regulators[id].enable_bit,
	41	mc13xxx_regulators[id].enable_bit);
167e3d8a YS	42	}
	43
	44	static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
	45	{
	46	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	47	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	48	int id = rdev_get_id(rdev);
167e3d8a YS	49
	50	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	51
7dd33c1d AS	52	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
7dd33c1d AS	53	mc13xxx_regulators[id].enable_bit, 0);
167e3d8a YS	54	}
	55
	56	static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
	57	{
	58	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	59	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	60	int ret, id = rdev_get_id(rdev);
	61	unsigned int val;
	62
167e3d8a	63	ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
167e3d8a YS	64	if (ret)
	65	return ret;
	66
	67	return (val & mc13xxx_regulators[id].enable_bit) != 0;
	68	}
	69
939b62d8 AL	70	static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
939b62d8 AL	71	unsigned selector)
167e3d8a YS	72	{
	73	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	74	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
939b62d8	75	int id = rdev_get_id(rdev);
167e3d8a	76
7dd33c1d AS	77	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
	78	mc13xxx_regulators[id].vsel_mask,
	79	selector << mc13xxx_regulators[id].vsel_shift);
167e3d8a YS	80	}
	81
	82	static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
	83	{
	84	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	85	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	86	int ret, id = rdev_get_id(rdev);
	87	unsigned int val;
	88
	89	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	90
167e3d8a YS	91	ret = mc13xxx_reg_read(priv->mc13xxx,
167e3d8a YS	92	mc13xxx_regulators[id].vsel_reg, &val);
167e3d8a YS	93	if (ret)
	94	return ret;
	95
	96	val = (val & mc13xxx_regulators[id].vsel_mask)
	97	>> mc13xxx_regulators[id].vsel_shift;
	98
	99	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
	100
3c24019d	101	BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
167e3d8a	102
34e74f39	103	return rdev->desc->volt_table[val];
167e3d8a YS	104	}
	105
	106	struct regulator_ops mc13xxx_regulator_ops = {
	107	.enable = mc13xxx_regulator_enable,
	108	.disable = mc13xxx_regulator_disable,
	109	.is_enabled = mc13xxx_regulator_is_enabled,
34e74f39	110	.list_voltage = regulator_list_voltage_table,
939b62d8	111	.set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
167e3d8a YS	112	.get_voltage = mc13xxx_regulator_get_voltage,
167e3d8a YS	113	};
4d7071f1	114	EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
167e3d8a YS	115
	116	int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
	117	int max_uV, unsigned *selector)
	118	{
167e3d8a YS	119	int id = rdev_get_id(rdev);
	120
	121	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
	122	__func__, id, min_uV, max_uV);
	123
34e74f39	124	if (min_uV <= rdev->desc->volt_table[0] &&
13407ea8 AL	125	rdev->desc->volt_table[0] <= max_uV) {
13407ea8 AL	126	*selector = 0;
167e3d8a	127	return 0;
13407ea8	128	} else {
167e3d8a	129	return -EINVAL;
13407ea8	130	}
167e3d8a	131	}
4d7071f1	132	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
167e3d8a	133
167e3d8a YS	134	struct regulator_ops mc13xxx_fixed_regulator_ops = {
	135	.enable = mc13xxx_regulator_enable,
	136	.disable = mc13xxx_regulator_disable,
	137	.is_enabled = mc13xxx_regulator_is_enabled,
34e74f39	138	.list_voltage = regulator_list_voltage_table,
167e3d8a	139	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
167e3d8a	140	};
4d7071f1	141	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
167e3d8a	142
93bcb23b	143	#ifdef CONFIG_OF
a5023574	144	int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
93bcb23b	145	{
86f66733 AL	146	struct device_node *parent;
86f66733 AL	147	int num;
93bcb23b	148
b431e69a	149	if (!pdev->dev.parent->of_node)
bf7f882b SK	150	return -ENODEV;
bf7f882b SK	151
b431e69a	152	parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
93bcb23b SG	153	if (!parent)
	154	return -ENODEV;
	155
86f66733	156	num = of_get_child_count(parent);
c92f5dd2	157	of_node_put(parent);
93bcb23b SG	158	return num;
93bcb23b SG	159	}
53269163	160	EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
93bcb23b	161
a5023574	162	struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
93bcb23b	163	struct platform_device pdev, struct mc13xxx_regulator regulators,
eb0d8e7a	164	int num_regulators)
93bcb23b SG	165	{
	166	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
	167	struct mc13xxx_regulator_init_data data, p;
	168	struct device_node parent, child;
2c8a5dca MS	169	int i, parsed = 0;
2c8a5dca MS	170
b431e69a	171	if (!pdev->dev.parent->of_node)
bf7f882b SK	172	return NULL;
bf7f882b SK	173
b431e69a	174	parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
93bcb23b SG	175	if (!parent)
	176	return NULL;
	177
	178	data = devm_kzalloc(&pdev->dev, sizeof(data) priv->num_regulators,
	179	GFP_KERNEL);
c92f5dd2 AL	180	if (!data) {
c92f5dd2 AL	181	of_node_put(parent);
93bcb23b	182	return NULL;
c92f5dd2 AL	183	}
c92f5dd2 AL	184
93bcb23b SG	185	p = data;
	186
	187	for_each_child_of_node(parent, child) {
eb0d8e7a AS	188	int found = 0;
eb0d8e7a AS	189
93bcb23b	190	for (i = 0; i < num_regulators; i++) {
eb0d8e7a AS	191	if (!regulators[i].desc.name)
eb0d8e7a AS	192	continue;
93bcb23b SG	193	if (!of_node_cmp(child->name,
	194	regulators[i].desc.name)) {
	195	p->id = i;
	196	p->init_data = of_get_regulator_init_data(
072e78b1 JMC	197	&pdev->dev, child,
072e78b1 JMC	198	&regulators[i].desc);
93bcb23b SG	199	p->node = child;
93bcb23b SG	200	p++;
2c8a5dca MS	201
2c8a5dca MS	202	parsed++;
eb0d8e7a	203	found = 1;
93bcb23b SG	204	break;
	205	}
	206	}
eb0d8e7a AS	207
	208	if (!found)
	209	dev_warn(&pdev->dev,
	210	"Unknown regulator: %s\n", child->name);
93bcb23b	211	}
c92f5dd2	212	of_node_put(parent);
93bcb23b	213
eb0d8e7a AS	214	priv->num_regulators = parsed;
eb0d8e7a AS	215
93bcb23b SG	216	return data;
93bcb23b SG	217	}
53269163	218	EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
93bcb23b SG	219	#endif
93bcb23b SG	220
167e3d8a YS	221	MODULE_LICENSE("GPL v2");
	222	MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
	223	MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
	224	MODULE_ALIAS("mc13xxx-regulator-core");