[GitHub/mt8127/android_kernel_alcatel_ttab.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;
}

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 mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
{
	struct device_node *parent;
	int num;

	of_node_get(pdev->dev.parent->of_node);
	parent = of_find_node_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;

	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) {
		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);
				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);
	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
939b62d8 AL	83	static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
939b62d8 AL	84	unsigned selector)
167e3d8a YS	85	{
	86	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	87	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
939b62d8	88	int id = rdev_get_id(rdev);
167e3d8a YS	89	int ret;
167e3d8a YS	90
167e3d8a YS	91	mc13xxx_lock(priv->mc13xxx);
	92	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
	93	mc13xxx_regulators[id].vsel_mask,
939b62d8	94	selector << mc13xxx_regulators[id].vsel_shift);
167e3d8a YS	95	mc13xxx_unlock(priv->mc13xxx);
	96
	97	return ret;
	98	}
	99
	100	static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
	101	{
	102	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	103	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	104	int ret, id = rdev_get_id(rdev);
	105	unsigned int val;
	106
	107	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
	108
	109	mc13xxx_lock(priv->mc13xxx);
	110	ret = mc13xxx_reg_read(priv->mc13xxx,
	111	mc13xxx_regulators[id].vsel_reg, &val);
	112	mc13xxx_unlock(priv->mc13xxx);
	113
	114	if (ret)
	115	return ret;
	116
	117	val = (val & mc13xxx_regulators[id].vsel_mask)
	118	>> mc13xxx_regulators[id].vsel_shift;
	119
	120	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
	121
3c24019d	122	BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
167e3d8a	123
34e74f39	124	return rdev->desc->volt_table[val];
167e3d8a YS	125	}
	126
	127	struct regulator_ops mc13xxx_regulator_ops = {
	128	.enable = mc13xxx_regulator_enable,
	129	.disable = mc13xxx_regulator_disable,
	130	.is_enabled = mc13xxx_regulator_is_enabled,
34e74f39	131	.list_voltage = regulator_list_voltage_table,
939b62d8	132	.set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
167e3d8a YS	133	.get_voltage = mc13xxx_regulator_get_voltage,
167e3d8a YS	134	};
4d7071f1	135	EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
167e3d8a YS	136
	137	int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
	138	int max_uV, unsigned *selector)
	139	{
167e3d8a YS	140	int id = rdev_get_id(rdev);
	141
	142	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
	143	__func__, id, min_uV, max_uV);
	144
34e74f39	145	if (min_uV <= rdev->desc->volt_table[0] &&
13407ea8 AL	146	rdev->desc->volt_table[0] <= max_uV) {
13407ea8 AL	147	*selector = 0;
167e3d8a	148	return 0;
13407ea8	149	} else {
167e3d8a	150	return -EINVAL;
13407ea8	151	}
167e3d8a	152	}
4d7071f1	153	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
167e3d8a	154
167e3d8a YS	155	struct regulator_ops mc13xxx_fixed_regulator_ops = {
	156	.enable = mc13xxx_regulator_enable,
	157	.disable = mc13xxx_regulator_disable,
	158	.is_enabled = mc13xxx_regulator_is_enabled,
34e74f39	159	.list_voltage = regulator_list_voltage_table,
167e3d8a	160	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
167e3d8a	161	};
4d7071f1	162	EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
167e3d8a	163
93bcb23b	164	#ifdef CONFIG_OF
a5023574	165	int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
93bcb23b	166	{
86f66733 AL	167	struct device_node *parent;
86f66733 AL	168	int num;
93bcb23b SG	169
	170	of_node_get(pdev->dev.parent->of_node);
	171	parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
	172	if (!parent)
	173	return -ENODEV;
	174
86f66733	175	num = of_get_child_count(parent);
c92f5dd2	176	of_node_put(parent);
93bcb23b SG	177	return num;
93bcb23b SG	178	}
53269163	179	EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
93bcb23b	180
a5023574	181	struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
93bcb23b	182	struct platform_device pdev, struct mc13xxx_regulator regulators,
eb0d8e7a	183	int num_regulators)
93bcb23b SG	184	{
	185	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
	186	struct mc13xxx_regulator_init_data data, p;
	187	struct device_node parent, child;
2c8a5dca MS	188	int i, parsed = 0;
2c8a5dca MS	189
93bcb23b SG	190	of_node_get(pdev->dev.parent->of_node);
	191	parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
	192	if (!parent)
	193	return NULL;
	194
	195	data = devm_kzalloc(&pdev->dev, sizeof(data) priv->num_regulators,
	196	GFP_KERNEL);
c92f5dd2 AL	197	if (!data) {
c92f5dd2 AL	198	of_node_put(parent);
93bcb23b	199	return NULL;
c92f5dd2 AL	200	}
c92f5dd2 AL	201
93bcb23b SG	202	p = data;
	203
	204	for_each_child_of_node(parent, child) {
eb0d8e7a AS	205	int found = 0;
eb0d8e7a AS	206
93bcb23b	207	for (i = 0; i < num_regulators; i++) {
eb0d8e7a AS	208	if (!regulators[i].desc.name)
eb0d8e7a AS	209	continue;
93bcb23b SG	210	if (!of_node_cmp(child->name,
	211	regulators[i].desc.name)) {
	212	p->id = i;
	213	p->init_data = of_get_regulator_init_data(
	214	&pdev->dev, child);
	215	p->node = child;
	216	p++;
2c8a5dca MS	217
2c8a5dca MS	218	parsed++;
eb0d8e7a	219	found = 1;
93bcb23b SG	220	break;
	221	}
	222	}
eb0d8e7a AS	223
	224	if (!found)
	225	dev_warn(&pdev->dev,
	226	"Unknown regulator: %s\n", child->name);
93bcb23b	227	}
c92f5dd2	228	of_node_put(parent);
93bcb23b	229
eb0d8e7a AS	230	priv->num_regulators = parsed;
eb0d8e7a AS	231
93bcb23b SG	232	return data;
93bcb23b SG	233	}
53269163	234	EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
93bcb23b SG	235	#endif
93bcb23b SG	236
167e3d8a YS	237	MODULE_LICENSE("GPL v2");
	238	MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
	239	MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
	240	MODULE_ALIAS("mc13xxx-regulator-core");