[deliverable/linux.git] / drivers / regulator / aat2870-regulator.c

/*
 * linux/drivers/regulator/aat2870-regulator.c
 *
 * Copyright (c) 2011, NVIDIA Corporation.
 * Author: Jin Park <jinyoungp@nvidia.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/aat2870.h>

struct aat2870_regulator {
	struct aat2870_data *aat2870;
	struct regulator_desc desc;

	int min_uV;
	int max_uV;

	u8 enable_addr;
	u8 enable_shift;
	u8 enable_mask;

	u8 voltage_addr;
	u8 voltage_shift;
	u8 voltage_mask;
};

static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
				       unsigned selector)
{
	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
	struct aat2870_data *aat2870 = ri->aat2870;

	return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
			       selector << ri->voltage_shift);
}

static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
{
	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
	struct aat2870_data *aat2870 = ri->aat2870;
	u8 val;
	int ret;

	ret = aat2870->read(aat2870, ri->voltage_addr, &val);
	if (ret)
		return ret;

	return (val & ri->voltage_mask) >> ri->voltage_shift;
}

static int aat2870_ldo_enable(struct regulator_dev *rdev)
{
	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
	struct aat2870_data *aat2870 = ri->aat2870;

	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
			       ri->enable_mask);
}

static int aat2870_ldo_disable(struct regulator_dev *rdev)
{
	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
	struct aat2870_data *aat2870 = ri->aat2870;

	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
}

static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
{
	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
	struct aat2870_data *aat2870 = ri->aat2870;
	u8 val;
	int ret;

	ret = aat2870->read(aat2870, ri->enable_addr, &val);
	if (ret)
		return ret;

	return val & ri->enable_mask ? 1 : 0;
}

static struct regulator_ops aat2870_ldo_ops = {
	.list_voltage = regulator_list_voltage_table,
	.set_voltage_sel = aat2870_ldo_set_voltage_sel,
	.get_voltage_sel = aat2870_ldo_get_voltage_sel,
	.enable = aat2870_ldo_enable,
	.disable = aat2870_ldo_disable,
	.is_enabled = aat2870_ldo_is_enabled,
};

static const unsigned int aat2870_ldo_voltages[] = {
	1200000, 1300000, 1500000, 1600000,
	1800000, 2000000, 2200000, 2500000,
	2600000, 2700000, 2800000, 2900000,
	3000000, 3100000, 3200000, 3300000,
};

#define AAT2870_LDO(ids)				\
	{						\
		.desc = {				\
			.name = #ids,			\
			.id = AAT2870_ID_##ids,		\
			.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages),	\
			.volt_table = aat2870_ldo_voltages, \
			.ops = &aat2870_ldo_ops,	\
			.type = REGULATOR_VOLTAGE,	\
			.owner = THIS_MODULE,		\
		},					\
		.min_uV = 1200000,			\
		.max_uV = 3300000,			\
	}

static struct aat2870_regulator aat2870_regulators[] = {
	AAT2870_LDO(LDOA),
	AAT2870_LDO(LDOB),
	AAT2870_LDO(LDOC),
	AAT2870_LDO(LDOD),
};

static struct aat2870_regulator *aat2870_get_regulator(int id)
{
	struct aat2870_regulator *ri = NULL;
	int i;

	for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
		ri = &aat2870_regulators[i];
		if (ri->desc.id == id)
			break;
	}

	if (i == ARRAY_SIZE(aat2870_regulators))
		return NULL;

	ri->enable_addr = AAT2870_LDO_EN;
	ri->enable_shift = id - AAT2870_ID_LDOA;
	ri->enable_mask = 0x1 << ri->enable_shift;

	ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
			   AAT2870_LDO_CD : AAT2870_LDO_AB;
	ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
	ri->voltage_mask = 0xF << ri->voltage_shift;

	return ri;
}

static int aat2870_regulator_probe(struct platform_device *pdev)
{
	struct aat2870_regulator *ri;
	struct regulator_config config = { 0 };
	struct regulator_dev *rdev;

	ri = aat2870_get_regulator(pdev->id);
	if (!ri) {
		dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
		return -EINVAL;
	}
	ri->aat2870 = dev_get_drvdata(pdev->dev.parent);

	config.dev = &pdev->dev;
	config.driver_data = ri;
	config.init_data = pdev->dev.platform_data;

	rdev = regulator_register(&ri->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(&pdev->dev, "Failed to register regulator %s\n",
			ri->desc.name);
		return PTR_ERR(rdev);
	}
	platform_set_drvdata(pdev, rdev);

	return 0;
}

static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);
	return 0;
}

static struct platform_driver aat2870_regulator_driver = {
	.driver = {
		.name	= "aat2870-regulator",
		.owner	= THIS_MODULE,
	},
	.probe	= aat2870_regulator_probe,
	.remove	= __devexit_p(aat2870_regulator_remove),
};

static int __init aat2870_regulator_init(void)
{
	return platform_driver_register(&aat2870_regulator_driver);
}
subsys_initcall(aat2870_regulator_init);

static void __exit aat2870_regulator_exit(void)
{
	platform_driver_unregister(&aat2870_regulator_driver);
}
module_exit(aat2870_regulator_exit);

MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
MODULE_ALIAS("platform:aat2870-regulator");
Commit	Line	Data
f7eb6c5e JP	1	/*
	2	* linux/drivers/regulator/aat2870-regulator.c
	3	*
	4	* Copyright (c) 2011, NVIDIA Corporation.
	5	* Author: Jin Park <jinyoungp@nvidia.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/init.h>
	24	#include <linux/err.h>
3a7d021b	25	#include <linux/module.h>
f7eb6c5e	26	#include <linux/slab.h>
f7eb6c5e JP	27	#include <linux/platform_device.h>
	28	#include <linux/regulator/driver.h>
	29	#include <linux/regulator/machine.h>
	30	#include <linux/mfd/aat2870.h>
	31
	32	struct aat2870_regulator {
b21bcd1a	33	struct aat2870_data *aat2870;
f7eb6c5e JP	34	struct regulator_desc desc;
f7eb6c5e JP	35
f7eb6c5e JP	36	int min_uV;
	37	int max_uV;
	38
	39	u8 enable_addr;
	40	u8 enable_shift;
	41	u8 enable_mask;
	42
	43	u8 voltage_addr;
	44	u8 voltage_shift;
	45	u8 voltage_mask;
	46	};
	47
f7eb6c5e JP	48	static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
	49	unsigned selector)
	50	{
	51	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	52	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	53
f7eb6c5e JP	54	return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
a5228d2e	55	selector << ri->voltage_shift);
f7eb6c5e JP	56	}
	57
	58	static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
	59	{
	60	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	61	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	62	u8 val;
	63	int ret;
	64
	65	ret = aat2870->read(aat2870, ri->voltage_addr, &val);
	66	if (ret)
	67	return ret;
	68
	69	return (val & ri->voltage_mask) >> ri->voltage_shift;
	70	}
	71
	72	static int aat2870_ldo_enable(struct regulator_dev *rdev)
	73	{
	74	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	75	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	76
	77	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
	78	ri->enable_mask);
	79	}
	80
	81	static int aat2870_ldo_disable(struct regulator_dev *rdev)
	82	{
	83	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	84	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	85
	86	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
	87	}
	88
	89	static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
	90	{
	91	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	92	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	93	u8 val;
	94	int ret;
	95
	96	ret = aat2870->read(aat2870, ri->enable_addr, &val);
	97	if (ret)
	98	return ret;
	99
	100	return val & ri->enable_mask ? 1 : 0;
	101	}
	102
	103	static struct regulator_ops aat2870_ldo_ops = {
4506c6d5	104	.list_voltage = regulator_list_voltage_table,
f7eb6c5e JP	105	.set_voltage_sel = aat2870_ldo_set_voltage_sel,
	106	.get_voltage_sel = aat2870_ldo_get_voltage_sel,
	107	.enable = aat2870_ldo_enable,
	108	.disable = aat2870_ldo_disable,
	109	.is_enabled = aat2870_ldo_is_enabled,
	110	};
	111
4506c6d5	112	static const unsigned int aat2870_ldo_voltages[] = {
f7eb6c5e JP	113	1200000, 1300000, 1500000, 1600000,
	114	1800000, 2000000, 2200000, 2500000,
	115	2600000, 2700000, 2800000, 2900000,
	116	3000000, 3100000, 3200000, 3300000,
	117	};
	118
	119	#define AAT2870_LDO(ids) \
	120	{ \
	121	.desc = { \
	122	.name = #ids, \
	123	.id = AAT2870_ID_##ids, \
	124	.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
4506c6d5	125	.volt_table = aat2870_ldo_voltages, \
f7eb6c5e JP	126	.ops = &aat2870_ldo_ops, \
	127	.type = REGULATOR_VOLTAGE, \
	128	.owner = THIS_MODULE, \
	129	}, \
f7eb6c5e JP	130	.min_uV = 1200000, \
	131	.max_uV = 3300000, \
	132	}
	133
	134	static struct aat2870_regulator aat2870_regulators[] = {
	135	AAT2870_LDO(LDOA),
	136	AAT2870_LDO(LDOB),
	137	AAT2870_LDO(LDOC),
	138	AAT2870_LDO(LDOD),
	139	};
	140
	141	static struct aat2870_regulator *aat2870_get_regulator(int id)
	142	{
	143	struct aat2870_regulator *ri = NULL;
	144	int i;
	145
	146	for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
	147	ri = &aat2870_regulators[i];
	148	if (ri->desc.id == id)
	149	break;
	150	}
	151
d4d6373c	152	if (i == ARRAY_SIZE(aat2870_regulators))
f7eb6c5e JP	153	return NULL;
	154
	155	ri->enable_addr = AAT2870_LDO_EN;
	156	ri->enable_shift = id - AAT2870_ID_LDOA;
	157	ri->enable_mask = 0x1 << ri->enable_shift;
	158
	159	ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
	160	AAT2870_LDO_CD : AAT2870_LDO_AB;
	161	ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
	162	ri->voltage_mask = 0xF << ri->voltage_shift;
	163
	164	return ri;
	165	}
	166
	167	static int aat2870_regulator_probe(struct platform_device *pdev)
	168	{
	169	struct aat2870_regulator *ri;
c172708d	170	struct regulator_config config = { 0 };
f7eb6c5e JP	171	struct regulator_dev *rdev;
	172
	173	ri = aat2870_get_regulator(pdev->id);
	174	if (!ri) {
	175	dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
	176	return -EINVAL;
	177	}
b21bcd1a	178	ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
f7eb6c5e	179
c172708d MB	180	config.dev = &pdev->dev;
	181	config.driver_data = ri;
	182	config.init_data = pdev->dev.platform_data;
	183
	184	rdev = regulator_register(&ri->desc, &config);
f7eb6c5e JP	185	if (IS_ERR(rdev)) {
	186	dev_err(&pdev->dev, "Failed to register regulator %s\n",
	187	ri->desc.name);
	188	return PTR_ERR(rdev);
	189	}
	190	platform_set_drvdata(pdev, rdev);
	191
	192	return 0;
	193	}
	194
	195	static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
	196	{
	197	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	198
	199	regulator_unregister(rdev);
	200	return 0;
	201	}
	202
	203	static struct platform_driver aat2870_regulator_driver = {
	204	.driver = {
	205	.name = "aat2870-regulator",
	206	.owner = THIS_MODULE,
	207	},
	208	.probe = aat2870_regulator_probe,
	209	.remove = __devexit_p(aat2870_regulator_remove),
	210	};
	211
	212	static int __init aat2870_regulator_init(void)
	213	{
	214	return platform_driver_register(&aat2870_regulator_driver);
	215	}
	216	subsys_initcall(aat2870_regulator_init);
	217
	218	static void __exit aat2870_regulator_exit(void)
	219	{
	220	platform_driver_unregister(&aat2870_regulator_driver);
	221	}
	222	module_exit(aat2870_regulator_exit);
	223
	224	MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
	225	MODULE_LICENSE("GPL");
	226	MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
ad9c5ffe	227	MODULE_ALIAS("platform:aat2870-regulator");