[GitHub/mt8127/android_kernel_alcatel_ttab.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/delay.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;

	const int *voltages; /* uV */

	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_list_voltage(struct regulator_dev *rdev,
				    unsigned selector)
{
	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);

	return ri->voltages[selector];
}

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 = aat2870_ldo_list_voltage,
	.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 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),	\
			.ops = &aat2870_ldo_ops,	\
			.type = REGULATOR_VOLTAGE,	\
			.owner = THIS_MODULE,		\
		},					\
		.voltages = aat2870_ldo_voltages,	\
		.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_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);

	rdev = regulator_register(&ri->desc, &pdev->dev,
				  pdev->dev.platform_data, ri, NULL);
	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>");
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 JP	26	#include <linux/slab.h>
	27	#include <linux/delay.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/regulator/driver.h>
	30	#include <linux/regulator/machine.h>
	31	#include <linux/mfd/aat2870.h>
	32
	33	struct aat2870_regulator {
b21bcd1a	34	struct aat2870_data *aat2870;
f7eb6c5e JP	35	struct regulator_desc desc;
	36
	37	const int voltages; / uV */
	38
	39	int min_uV;
	40	int max_uV;
	41
	42	u8 enable_addr;
	43	u8 enable_shift;
	44	u8 enable_mask;
	45
	46	u8 voltage_addr;
	47	u8 voltage_shift;
	48	u8 voltage_mask;
	49	};
	50
	51	static int aat2870_ldo_list_voltage(struct regulator_dev *rdev,
	52	unsigned selector)
	53	{
	54	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
	55
	56	return ri->voltages[selector];
	57	}
	58
	59	static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
	60	unsigned selector)
	61	{
	62	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	63	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	64
f7eb6c5e JP	65	return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
a5228d2e	66	selector << ri->voltage_shift);
f7eb6c5e JP	67	}
	68
	69	static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
	70	{
	71	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	72	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	73	u8 val;
	74	int ret;
	75
	76	ret = aat2870->read(aat2870, ri->voltage_addr, &val);
	77	if (ret)
	78	return ret;
	79
	80	return (val & ri->voltage_mask) >> ri->voltage_shift;
	81	}
	82
	83	static int aat2870_ldo_enable(struct regulator_dev *rdev)
	84	{
	85	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	86	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	87
	88	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
	89	ri->enable_mask);
	90	}
	91
	92	static int aat2870_ldo_disable(struct regulator_dev *rdev)
	93	{
	94	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	95	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	96
	97	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
	98	}
	99
	100	static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
	101	{
	102	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
b21bcd1a	103	struct aat2870_data *aat2870 = ri->aat2870;
f7eb6c5e JP	104	u8 val;
	105	int ret;
	106
	107	ret = aat2870->read(aat2870, ri->enable_addr, &val);
	108	if (ret)
	109	return ret;
	110
	111	return val & ri->enable_mask ? 1 : 0;
	112	}
	113
	114	static struct regulator_ops aat2870_ldo_ops = {
	115	.list_voltage = aat2870_ldo_list_voltage,
	116	.set_voltage_sel = aat2870_ldo_set_voltage_sel,
	117	.get_voltage_sel = aat2870_ldo_get_voltage_sel,
	118	.enable = aat2870_ldo_enable,
	119	.disable = aat2870_ldo_disable,
	120	.is_enabled = aat2870_ldo_is_enabled,
	121	};
	122
	123	static const int aat2870_ldo_voltages[] = {
	124	1200000, 1300000, 1500000, 1600000,
	125	1800000, 2000000, 2200000, 2500000,
	126	2600000, 2700000, 2800000, 2900000,
	127	3000000, 3100000, 3200000, 3300000,
	128	};
	129
	130	#define AAT2870_LDO(ids) \
	131	{ \
	132	.desc = { \
	133	.name = #ids, \
	134	.id = AAT2870_ID_##ids, \
	135	.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
	136	.ops = &aat2870_ldo_ops, \
	137	.type = REGULATOR_VOLTAGE, \
	138	.owner = THIS_MODULE, \
	139	}, \
	140	.voltages = aat2870_ldo_voltages, \
	141	.min_uV = 1200000, \
	142	.max_uV = 3300000, \
	143	}
	144
	145	static struct aat2870_regulator aat2870_regulators[] = {
	146	AAT2870_LDO(LDOA),
	147	AAT2870_LDO(LDOB),
	148	AAT2870_LDO(LDOC),
	149	AAT2870_LDO(LDOD),
	150	};
	151
	152	static struct aat2870_regulator *aat2870_get_regulator(int id)
	153	{
	154	struct aat2870_regulator *ri = NULL;
	155	int i;
	156
	157	for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
	158	ri = &aat2870_regulators[i];
	159	if (ri->desc.id == id)
	160	break;
	161	}
	162
d4d6373c	163	if (i == ARRAY_SIZE(aat2870_regulators))
f7eb6c5e JP	164	return NULL;
	165
	166	ri->enable_addr = AAT2870_LDO_EN;
	167	ri->enable_shift = id - AAT2870_ID_LDOA;
	168	ri->enable_mask = 0x1 << ri->enable_shift;
	169
	170	ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
	171	AAT2870_LDO_CD : AAT2870_LDO_AB;
	172	ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
	173	ri->voltage_mask = 0xF << ri->voltage_shift;
	174
	175	return ri;
	176	}
	177
	178	static int aat2870_regulator_probe(struct platform_device *pdev)
	179	{
	180	struct aat2870_regulator *ri;
	181	struct regulator_dev *rdev;
	182
	183	ri = aat2870_get_regulator(pdev->id);
	184	if (!ri) {
	185	dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
	186	return -EINVAL;
	187	}
b21bcd1a	188	ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
f7eb6c5e JP	189
f7eb6c5e JP	190	rdev = regulator_register(&ri->desc, &pdev->dev,
2c043bcb	191	pdev->dev.platform_data, ri, NULL);
f7eb6c5e JP	192	if (IS_ERR(rdev)) {
	193	dev_err(&pdev->dev, "Failed to register regulator %s\n",
	194	ri->desc.name);
	195	return PTR_ERR(rdev);
	196	}
	197	platform_set_drvdata(pdev, rdev);
	198
	199	return 0;
	200	}
	201
	202	static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
	203	{
	204	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	205
	206	regulator_unregister(rdev);
	207	return 0;
	208	}
	209
	210	static struct platform_driver aat2870_regulator_driver = {
	211	.driver = {
	212	.name = "aat2870-regulator",
	213	.owner = THIS_MODULE,
	214	},
	215	.probe = aat2870_regulator_probe,
	216	.remove = __devexit_p(aat2870_regulator_remove),
	217	};
	218
	219	static int __init aat2870_regulator_init(void)
	220	{
	221	return platform_driver_register(&aat2870_regulator_driver);
	222	}
	223	subsys_initcall(aat2870_regulator_init);
	224
	225	static void __exit aat2870_regulator_exit(void)
	226	{
	227	platform_driver_unregister(&aat2870_regulator_driver);
	228	}
	229	module_exit(aat2870_regulator_exit);
	230
	231	MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
	232	MODULE_LICENSE("GPL");
	233	MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");