[mirror_ubuntu-artful-kernel.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);
	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);

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 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_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)
{
	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] &&
	    mc13xxx_regulators[id].voltages[0] <= max_uV)
		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);

#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 <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);
	36	int ret;
	37
	38	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	39
	40	mc13xxx_lock(priv->mc13xxx);
	41	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
	42	mc13xxx_regulators[id].enable_bit,
	43	mc13xxx_regulators[id].enable_bit);
	44	mc13xxx_unlock(priv->mc13xxx);
	45
	46	return ret;
	47	}
	48
	49	static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
	50	{
	51	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	52	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	53	int id = rdev_get_id(rdev);
	54	int ret;
	55
	56	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	57
	58	mc13xxx_lock(priv->mc13xxx);
	59	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
	60	mc13xxx_regulators[id].enable_bit, 0);
	61	mc13xxx_unlock(priv->mc13xxx);
	62
	63	return ret;
	64	}
	65
	66	static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
	67	{
	68	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	69	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	70	int ret, id = rdev_get_id(rdev);
	71	unsigned int val;
	72
	73	mc13xxx_lock(priv->mc13xxx);
	74	ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
	75	mc13xxx_unlock(priv->mc13xxx);
	76
	77	if (ret)
	78	return ret;
	79
	80	return (val & mc13xxx_regulators[id].enable_bit) != 0;
	81	}
	82
	83	int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev,
	84	unsigned selector)
	85	{
	86	int id = rdev_get_id(rdev);
	87	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	88	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	89
	90	if (selector >= mc13xxx_regulators[id].desc.n_voltages)
	91	return -EINVAL;
	92
93	return mc13xxx_regulators[id].voltages[selector];
94	}
4d7071f1	95	EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage);
167e3d8a	96
939b62d8 AL	97	static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
939b62d8 AL	98	unsigned selector)
167e3d8a YS	99	{
	100	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	101	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
939b62d8	102	int id = rdev_get_id(rdev);
167e3d8a YS	103	int ret;
167e3d8a YS	104
167e3d8a YS	105	mc13xxx_lock(priv->mc13xxx);
	106	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
	107	mc13xxx_regulators[id].vsel_mask,
939b62d8	108	selector << mc13xxx_regulators[id].vsel_shift);
167e3d8a YS	109	mc13xxx_unlock(priv->mc13xxx);
	110
	111	return ret;
	112	}
	113
	114	static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
	115	{
	116	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	117	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	118	int ret, id = rdev_get_id(rdev);
	119	unsigned int val;
	120
	121	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	122
	123	mc13xxx_lock(priv->mc13xxx);
	124	ret = mc13xxx_reg_read(priv->mc13xxx,
	125	mc13xxx_regulators[id].vsel_reg, &val);
	126	mc13xxx_unlock(priv->mc13xxx);
	127
	128	if (ret)
	129	return ret;
	130
	131	val = (val & mc13xxx_regulators[id].vsel_mask)
	132	>> mc13xxx_regulators[id].vsel_shift;
	133
	134	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
	135
3c24019d	136	BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
167e3d8a YS	137
	138	return mc13xxx_regulators[id].voltages[val];
	139	}
	140
	141	struct regulator_ops mc13xxx_regulator_ops = {
	142	.enable = mc13xxx_regulator_enable,
	143	.disable = mc13xxx_regulator_disable,
	144	.is_enabled = mc13xxx_regulator_is_enabled,
	145	.list_voltage = mc13xxx_regulator_list_voltage,
939b62d8	146	.set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
167e3d8a YS	147	.get_voltage = mc13xxx_regulator_get_voltage,
167e3d8a YS	148	};
4d7071f1	149	EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
167e3d8a YS	150
	151	int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
	152	int max_uV, unsigned *selector)
	153	{
	154	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	155	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	156	int id = rdev_get_id(rdev);
	157
	158	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
	159	__func__, id, min_uV, max_uV);
	160
ee5e6253 AL	161	if (min_uV <= mc13xxx_regulators[id].voltages[0] &&
ee5e6253 AL	162	mc13xxx_regulators[id].voltages[0] <= max_uV)
167e3d8a YS	163	return 0;
	164	else
	165	return -EINVAL;
	166	}
4d7071f1	167	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
167e3d8a YS	168
	169	int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
	170	{
	171	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	172	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	173	int id = rdev_get_id(rdev);
	174
	175	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	176
	177	return mc13xxx_regulators[id].voltages[0];
	178	}
4d7071f1	179	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
167e3d8a YS	180
	181	struct regulator_ops mc13xxx_fixed_regulator_ops = {
	182	.enable = mc13xxx_regulator_enable,
	183	.disable = mc13xxx_regulator_disable,
	184	.is_enabled = mc13xxx_regulator_is_enabled,
	185	.list_voltage = mc13xxx_regulator_list_voltage,
	186	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
	187	.get_voltage = mc13xxx_fixed_regulator_get_voltage,
	188	};
4d7071f1	189	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
167e3d8a YS	190
	191	int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
	192	{
	193	return 1;
	194	}
4d7071f1	195	EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
167e3d8a	196
93bcb23b SG	197	#ifdef CONFIG_OF
	198	int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
	199	{
	200	struct device_node parent, child;
	201	int num = 0;
	202
	203	of_node_get(pdev->dev.parent->of_node);
	204	parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
	205	if (!parent)
	206	return -ENODEV;
	207
	208	for_each_child_of_node(parent, child)
	209	num++;
	210
	211	return num;
	212	}
53269163	213	EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
93bcb23b SG	214
	215	struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt(
	216	struct platform_device pdev, struct mc13xxx_regulator regulators,
	217	int num_regulators)
	218	{
	219	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
	220	struct mc13xxx_regulator_init_data data, p;
	221	struct device_node parent, child;
	222	int i;
	223
	224	of_node_get(pdev->dev.parent->of_node);
	225	parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
	226	if (!parent)
	227	return NULL;
	228
	229	data = devm_kzalloc(&pdev->dev, sizeof(data) priv->num_regulators,
	230	GFP_KERNEL);
	231	if (!data)
	232	return NULL;
	233	p = data;
	234
	235	for_each_child_of_node(parent, child) {
	236	for (i = 0; i < num_regulators; i++) {
	237	if (!of_node_cmp(child->name,
	238	regulators[i].desc.name)) {
	239	p->id = i;
	240	p->init_data = of_get_regulator_init_data(
	241	&pdev->dev, child);
	242	p->node = child;
	243	p++;
	244	break;
	245	}
	246	}
	247	}
	248
	249	return data;
	250	}
53269163	251	EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
93bcb23b SG	252	#endif
93bcb23b SG	253
167e3d8a YS	254	MODULE_LICENSE("GPL v2");
	255	MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
	256	MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
	257	MODULE_ALIAS("mc13xxx-regulator-core");