Commit 08ff6f2a authored by Haojian Zhuang's avatar Haojian Zhuang Committed by Samuel Ortiz
Browse files

regulator: Add max8925 support 



MAX8925 contains 3 Buck and 20 LDO regulator.

Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 4f811ef0

drivers/regulator/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -94,6 +94,12 @@ config REGULATOR_MAX8660 
	  This driver controls a Maxim 8660/8661 voltage output

	  regulator via I2C bus.



config REGULATOR_MAX8925

	tristate "Maxim MAX8925 Power Management IC"

	depends on MFD_MAX8925

	help

	  Say y here to support the voltage regulaltor of Maxim MAX8925 PMIC.



config REGULATOR_TWL4030

	bool "TI TWL4030/TWL5030/TWL6030/TPS695x0 PMIC"

	depends on TWL4030_CORE

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o 
obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o

obj-$(CONFIG_REGULATOR_MAX8649)	+= max8649.o

obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o

obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o

obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o

obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o

obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o

drivers/regulator/max8925-regulator.c

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+306 −0
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/*

 * Regulators driver for Maxim max8925

 *

 * Copyright (C) 2009 Marvell International Ltd.

 *      Haojian Zhuang <haojian.zhuang@marvell.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.

 */

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/mfd/max8925.h>



#define SD1_DVM_VMIN		850000

#define SD1_DVM_VMAX		1000000

#define SD1_DVM_STEP		50000

#define SD1_DVM_SHIFT		5		/* SDCTL1 bit5 */

#define SD1_DVM_EN		6		/* SDV1 bit 6 */



struct max8925_regulator_info {

	struct regulator_desc	desc;

	struct regulator_dev	*regulator;

	struct i2c_client	*i2c;

	struct max8925_chip	*chip;



	int	min_uV;

	int	max_uV;

	int	step_uV;

	int	vol_reg;

	int	vol_shift;

	int	vol_nbits;

	int	enable_bit;

	int	enable_reg;

};



static inline int check_range(struct max8925_regulator_info *info,

			      int min_uV, int max_uV)

{

	if (min_uV < info->min_uV || min_uV > info->max_uV)

		return -EINVAL;



	return 0;

}



static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return info->min_uV + index * info->step_uV;

}



static int max8925_set_voltage(struct regulator_dev *rdev,

			       int min_uV, int max_uV)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	unsigned char data, mask;



	if (check_range(info, min_uV, max_uV)) {

		dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",

			min_uV, max_uV);

		return -EINVAL;

	}

	data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;

	data <<= info->vol_shift;

	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;



	return max8925_set_bits(info->i2c, info->vol_reg, mask, data);

}



static int max8925_get_voltage(struct regulator_dev *rdev)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	unsigned char data, mask;

	int ret;



	ret = max8925_reg_read(info->i2c, info->vol_reg);

	if (ret < 0)

		return ret;

	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;

	data = (ret & mask) >> info->vol_shift;



	return max8925_list_voltage(rdev, data);

}



static int max8925_enable(struct regulator_dev *rdev)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);



	return max8925_set_bits(info->i2c, info->enable_reg,

				1 << info->enable_bit,

				1 << info->enable_bit);

}



static int max8925_disable(struct regulator_dev *rdev)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);



	return max8925_set_bits(info->i2c, info->enable_reg,

				1 << info->enable_bit, 0);

}



static int max8925_is_enabled(struct regulator_dev *rdev)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	int ret;



	ret = max8925_reg_read(info->i2c, info->vol_reg);

	if (ret < 0)

		return ret;



	return ret & (1 << info->enable_bit);

}



static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	unsigned char data, mask;



	if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)

		return -EINVAL;



	data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;

	data <<= SD1_DVM_SHIFT;

	mask = 3 << SD1_DVM_SHIFT;



	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);

}



static int max8925_set_dvm_enable(struct regulator_dev *rdev)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);



	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,

				1 << SD1_DVM_EN);

}



static int max8925_set_dvm_disable(struct regulator_dev *rdev)

{

	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);



	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);

}



static struct regulator_ops max8925_regulator_sdv_ops = {

	.set_voltage		= max8925_set_voltage,

	.get_voltage		= max8925_get_voltage,

	.enable			= max8925_enable,

	.disable		= max8925_disable,

	.is_enabled		= max8925_is_enabled,

	.set_suspend_voltage	= max8925_set_dvm_voltage,

	.set_suspend_enable	= max8925_set_dvm_enable,

	.set_suspend_disable	= max8925_set_dvm_disable,

};



static struct regulator_ops max8925_regulator_ldo_ops = {

	.set_voltage		= max8925_set_voltage,

	.get_voltage		= max8925_get_voltage,

	.enable			= max8925_enable,

	.disable		= max8925_disable,

	.is_enabled		= max8925_is_enabled,

};



#define MAX8925_SDV(_id, min, max, step)			\

{								\

	.desc	= {						\

		.name	= "SDV" #_id,				\

		.ops	= &max8925_regulator_sdv_ops,		\

		.type	= REGULATOR_VOLTAGE,			\

		.id	= MAX8925_ID_SD##_id,			\

		.owner	= THIS_MODULE,				\

	},							\

	.min_uV		= min * 1000,				\

	.max_uV		= max * 1000,				\

	.step_uV	= step * 1000,				\

	.vol_reg	= MAX8925_SDV##_id,			\

	.vol_shift	= 0,					\

	.vol_nbits	= 6,					\

	.enable_reg	= MAX8925_SDCTL##_id,			\

	.enable_bit	= 0,					\

}



#define MAX8925_LDO(_id, min, max, step)			\

{								\

	.desc	= {						\

		.name	= "LDO" #_id,				\

		.ops	= &max8925_regulator_ldo_ops,		\

		.type	= REGULATOR_VOLTAGE,			\

		.id	= MAX8925_ID_LDO##_id,			\

		.owner	= THIS_MODULE,				\

	},							\

	.min_uV		= min * 1000,				\

	.max_uV		= max * 1000,				\

	.step_uV	= step * 1000,				\

	.vol_reg	= MAX8925_LDOVOUT##_id,			\

	.vol_shift	= 0,					\

	.vol_nbits	= 6,					\

	.enable_reg	= MAX8925_LDOCTL##_id,			\

	.enable_bit	= 0,					\

}



static struct max8925_regulator_info max8925_regulator_info[] = {

	MAX8925_SDV(1, 637.5, 1425, 12.5),

	MAX8925_SDV(2,   650, 2225,   25),

	MAX8925_SDV(3,   750, 3900,   50),



	MAX8925_LDO(1,  750, 3900, 50),

	MAX8925_LDO(2,  650, 2250, 25),

	MAX8925_LDO(3,  650, 2250, 25),

	MAX8925_LDO(4,  750, 3900, 50),

	MAX8925_LDO(5,  750, 3900, 50),

	MAX8925_LDO(6,  750, 3900, 50),

	MAX8925_LDO(7,  750, 3900, 50),

	MAX8925_LDO(8,  750, 3900, 50),

	MAX8925_LDO(9,  750, 3900, 50),

	MAX8925_LDO(10, 750, 3900, 50),

	MAX8925_LDO(11, 750, 3900, 50),

	MAX8925_LDO(12, 750, 3900, 50),

	MAX8925_LDO(13, 750, 3900, 50),

	MAX8925_LDO(14, 750, 3900, 50),

	MAX8925_LDO(15, 750, 3900, 50),

	MAX8925_LDO(16, 750, 3900, 50),

	MAX8925_LDO(17, 650, 2250, 25),

	MAX8925_LDO(18, 650, 2250, 25),

	MAX8925_LDO(19, 750, 3900, 50),

	MAX8925_LDO(20, 750, 3900, 50),

};



static inline struct max8925_regulator_info *find_regulator_info(int id)

{

	struct max8925_regulator_info *ri;

	int i;



	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {

		ri = &max8925_regulator_info[i];

		if (ri->desc.id == id)

			return ri;

	}

	return NULL;

}



static int __devinit max8925_regulator_probe(struct platform_device *pdev)

{

	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);

	struct max8925_platform_data *pdata = chip->dev->platform_data;

	struct max8925_regulator_info *ri = NULL;

	struct regulator_dev *rdev;



	ri = find_regulator_info(pdev->id);

	if (ri == NULL) {

		dev_err(&pdev->dev, "invalid regulator ID specified\n");

		return -EINVAL;

	}

	ri->i2c = chip->i2c;

	ri->chip = chip;



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

				  pdata->regulator[pdev->id], 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 max8925_regulator_remove(struct platform_device *pdev)

{

	struct regulator_dev *rdev = platform_get_drvdata(pdev);



	regulator_unregister(rdev);

	return 0;

}



static struct platform_driver max8925_regulator_driver = {

	.driver		= {

		.name	= "max8925-regulator",

		.owner	= THIS_MODULE,

	},

	.probe		= max8925_regulator_probe,

	.remove		= __devexit_p(max8925_regulator_remove),

};



static int __init max8925_regulator_init(void)

{

	return platform_driver_register(&max8925_regulator_driver);

}

subsys_initcall(max8925_regulator_init);



static void __exit max8925_regulator_exit(void)

{

	platform_driver_unregister(&max8925_regulator_driver);

}

module_exit(max8925_regulator_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");

MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");

MODULE_ALIAS("platform:max8925-regulator");