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Commit f7eb6c5e authored by Jin Park's avatar Jin Park Committed by Samuel Ortiz
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regulator: aat2870: Add AAT2870 regulator driver 



Add regulator driver for AnalogicTech AAT2870.

Signed-off-by: default avatarJin Park <jinyoungp@nvidia.com>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 4b0d711b

drivers/regulator/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -310,5 +310,12 @@ config REGULATOR_TPS65910 
	help

	  This driver supports TPS65910 voltage regulator chips.



config REGULATOR_AAT2870

	tristate "AnalogicTech AAT2870 Regulators"

	depends on MFD_AAT2870_CORE

	help

	  If you have a AnalogicTech AAT2870 say Y to enable the

	  regulator driver.



endif

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -44,5 +44,6 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o 
obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500.o

obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o

obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o

obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o



ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/aat2870-regulator.c

0 → 100644
+232 −0
Original line number Diff line number Diff line 
/*

 * 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/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 platform_device *pdev;

	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 = dev_get_drvdata(ri->pdev->dev.parent);



	return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,

			(selector << ri->voltage_shift) & ri->voltage_mask);

}



static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)

{

	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);

	struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);

	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 = dev_get_drvdata(ri->pdev->dev.parent);



	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 = dev_get_drvdata(ri->pdev->dev.parent);



	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 = dev_get_drvdata(ri->pdev->dev.parent);

	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 (!ri)

		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->pdev = pdev;



	rdev = regulator_register(&ri->desc, &pdev->dev,

				  pdev->dev.platform_data, ri);

	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>");