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Commit a71b797f authored by Haojian Zhuang's avatar Haojian Zhuang Committed by Liam Girdwood
Browse files

regulator: enable max8649 regulator driver 



Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 79ac9bc3

drivers/regulator/Kconfig

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@@ -69,6 +69,13 @@ config REGULATOR_MAX1586 
	  regulator via I2C bus. The provided regulator is suitable

	  for PXA27x chips to control VCC_CORE and VCC_USIM voltages.



config REGULATOR_MAX8649

	tristate "Maxim 8649 voltage regulator"

	depends on I2C

	help

	  This driver controls a Maxim 8649 voltage output regulator via

	  I2C bus.



config REGULATOR_MAX8660

	tristate "Maxim 8660/8661 voltage regulator"

	depends on I2C

drivers/regulator/Makefile

+1 −0
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@@ -12,6 +12,7 @@ obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o 
obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o

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_WM831X) += wm831x-dcdc.o

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

drivers/regulator/max8649.c

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/*

 * Regulators driver for Maxim max8649

 *

 * Copyright (C) 2009-2010 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/module.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/max8649.h>



#define MAX8649_DCDC_VMIN	750000		/* uV */

#define MAX8649_DCDC_VMAX	1380000		/* uV */

#define MAX8649_DCDC_STEP	10000		/* uV */

#define MAX8649_VOL_MASK	0x3f



/* Registers */

#define MAX8649_MODE0		0x00

#define MAX8649_MODE1		0x01

#define MAX8649_MODE2		0x02

#define MAX8649_MODE3		0x03

#define MAX8649_CONTROL		0x04

#define MAX8649_SYNC		0x05

#define MAX8649_RAMP		0x06

#define MAX8649_CHIP_ID1	0x08

#define MAX8649_CHIP_ID2	0x09



/* Bits */

#define MAX8649_EN_PD		(1 << 7)

#define MAX8649_VID0_PD		(1 << 6)

#define MAX8649_VID1_PD		(1 << 5)

#define MAX8649_VID_MASK	(3 << 5)



#define MAX8649_FORCE_PWM	(1 << 7)

#define MAX8649_SYNC_EXTCLK	(1 << 6)



#define MAX8649_EXT_MASK	(3 << 6)



#define MAX8649_RAMP_MASK	(7 << 5)

#define MAX8649_RAMP_DOWN	(1 << 1)



struct max8649_regulator_info {

	struct regulator_dev	*regulator;

	struct i2c_client	*i2c;

	struct device		*dev;

	struct mutex		io_lock;



	int		vol_reg;

	unsigned	mode:2;	/* bit[1:0] = VID1, VID0 */

	unsigned	extclk_freq:2;

	unsigned	extclk:1;

	unsigned	ramp_timing:3;

	unsigned	ramp_down:1;

};



/* I2C operations */



static inline int max8649_read_device(struct i2c_client *i2c,

				      int reg, int bytes, void *dest)

{

	unsigned char data;

	int ret;



	data = (unsigned char)reg;

	ret = i2c_master_send(i2c, &data, 1);

	if (ret < 0)

		return ret;

	ret = i2c_master_recv(i2c, dest, bytes);

	if (ret < 0)

		return ret;

	return 0;

}



static inline int max8649_write_device(struct i2c_client *i2c,

				       int reg, int bytes, void *src)

{

	unsigned char buf[bytes + 1];

	int ret;



	buf[0] = (unsigned char)reg;

	memcpy(&buf[1], src, bytes);



	ret = i2c_master_send(i2c, buf, bytes + 1);

	if (ret < 0)

		return ret;

	return 0;

}



static int max8649_reg_read(struct i2c_client *i2c, int reg)

{

	struct max8649_regulator_info *info = i2c_get_clientdata(i2c);

	unsigned char data;

	int ret;



	mutex_lock(&info->io_lock);

	ret = max8649_read_device(i2c, reg, 1, &data);

	mutex_unlock(&info->io_lock);



	if (ret < 0)

		return ret;

	return (int)data;

}



static int max8649_set_bits(struct i2c_client *i2c, int reg,

			    unsigned char mask, unsigned char data)

{

	struct max8649_regulator_info *info = i2c_get_clientdata(i2c);

	unsigned char value;

	int ret;



	mutex_lock(&info->io_lock);

	ret = max8649_read_device(i2c, reg, 1, &value);

	if (ret < 0)

		goto out;

	value &= ~mask;

	value |= data;

	ret = max8649_write_device(i2c, reg, 1, &value);

out:

	mutex_unlock(&info->io_lock);

	return ret;

}



static inline int check_range(int min_uV, int max_uV)

{

	if ((min_uV < MAX8649_DCDC_VMIN) || (max_uV > MAX8649_DCDC_VMAX)

		|| (min_uV > max_uV))

		return -EINVAL;

	return 0;

}



static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)

{

	return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);

}



static int max8649_get_voltage(struct regulator_dev *rdev)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	unsigned char data;

	int ret;



	ret = max8649_reg_read(info->i2c, info->vol_reg);

	if (ret < 0)

		return ret;

	data = (unsigned char)ret & MAX8649_VOL_MASK;

	return max8649_list_voltage(rdev, data);

}



static int max8649_set_voltage(struct regulator_dev *rdev,

			       int min_uV, int max_uV)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	unsigned char data, mask;



	if (check_range(min_uV, max_uV)) {

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

			min_uV, max_uV);

		return -EINVAL;

	}

	data = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1)

		/ MAX8649_DCDC_STEP;

	mask = MAX8649_VOL_MASK;



	return max8649_set_bits(info->i2c, info->vol_reg, mask, data);

}



/* EN_PD means pulldown on EN input */

static int max8649_enable(struct regulator_dev *rdev)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	return max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_EN_PD, 0);

}



/*

 * Applied internal pulldown resistor on EN input pin.

 * If pulldown EN pin outside, it would be better.

 */

static int max8649_disable(struct regulator_dev *rdev)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	return max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_EN_PD,

				MAX8649_EN_PD);

}



static int max8649_is_enabled(struct regulator_dev *rdev)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	int ret;



	ret = max8649_reg_read(info->i2c, MAX8649_CONTROL);

	if (ret < 0)

		return ret;

	return !((unsigned char)ret & MAX8649_EN_PD);

}



static int max8649_enable_time(struct regulator_dev *rdev)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	int voltage, rate, ret;



	/* get voltage */

	ret = max8649_reg_read(info->i2c, info->vol_reg);

	if (ret < 0)

		return ret;

	ret &= MAX8649_VOL_MASK;

	voltage = max8649_list_voltage(rdev, (unsigned char)ret); /* uV */



	/* get rate */

	ret = max8649_reg_read(info->i2c, MAX8649_RAMP);

	if (ret < 0)

		return ret;

	ret = (ret & MAX8649_RAMP_MASK) >> 5;

	rate = (32 * 1000) >> ret;	/* uV/uS */



	return (voltage / rate);

}



static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);



	switch (mode) {

	case REGULATOR_MODE_FAST:

		max8649_set_bits(info->i2c, info->vol_reg, MAX8649_FORCE_PWM,

				 MAX8649_FORCE_PWM);

		break;

	case REGULATOR_MODE_NORMAL:

		max8649_set_bits(info->i2c, info->vol_reg,

				 MAX8649_FORCE_PWM, 0);

		break;

	default:

		return -EINVAL;

	}

	return 0;

}



static unsigned int max8649_get_mode(struct regulator_dev *rdev)

{

	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	int ret;



	ret = max8649_reg_read(info->i2c, info->vol_reg);

	if (ret & MAX8649_FORCE_PWM)

		return REGULATOR_MODE_FAST;

	return REGULATOR_MODE_NORMAL;

}



static struct regulator_ops max8649_dcdc_ops = {

	.set_voltage	= max8649_set_voltage,

	.get_voltage	= max8649_get_voltage,

	.list_voltage	= max8649_list_voltage,

	.enable		= max8649_enable,

	.disable	= max8649_disable,

	.is_enabled	= max8649_is_enabled,

	.enable_time	= max8649_enable_time,

	.set_mode	= max8649_set_mode,

	.get_mode	= max8649_get_mode,



};



static struct regulator_desc dcdc_desc = {

	.name		= "max8649",

	.ops		= &max8649_dcdc_ops,

	.type		= REGULATOR_VOLTAGE,

	.n_voltages	= 1 << 6,

	.owner		= THIS_MODULE,

};



static int __devinit max8649_regulator_probe(struct i2c_client *client,

					     const struct i2c_device_id *id)

{

	struct max8649_platform_data *pdata = client->dev.platform_data;

	struct max8649_regulator_info *info = NULL;

	unsigned char data;

	int ret;



	info = kzalloc(sizeof(struct max8649_regulator_info), GFP_KERNEL);

	if (!info) {

		dev_err(&client->dev, "No enough memory\n");

		return -ENOMEM;

	}



	info->i2c = client;

	info->dev = &client->dev;

	mutex_init(&info->io_lock);

	i2c_set_clientdata(client, info);



	info->mode = pdata->mode;

	switch (info->mode) {

	case 0:

		info->vol_reg = MAX8649_MODE0;

		break;

	case 1:

		info->vol_reg = MAX8649_MODE1;

		break;

	case 2:

		info->vol_reg = MAX8649_MODE2;

		break;

	case 3:

		info->vol_reg = MAX8649_MODE3;

		break;

	default:

		break;

	}



	ret = max8649_reg_read(info->i2c, MAX8649_CHIP_ID1);

	if (ret < 0) {

		dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",

			ret);

		goto out;

	}

	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);



	/* enable VID0 & VID1 */

	max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_VID_MASK, 0);



	/* enable/disable external clock synchronization */

	info->extclk = pdata->extclk;

	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;

	max8649_set_bits(info->i2c, info->vol_reg, MAX8649_SYNC_EXTCLK, data);

	if (info->extclk) {

		/* set external clock frequency */

		info->extclk_freq = pdata->extclk_freq;

		max8649_set_bits(info->i2c, MAX8649_SYNC, MAX8649_EXT_MASK,

				 info->extclk_freq);

	}



	if (pdata->ramp_timing) {

		info->ramp_timing = pdata->ramp_timing;

		max8649_set_bits(info->i2c, MAX8649_RAMP, MAX8649_RAMP_MASK,

				 info->ramp_timing << 5);

	}



	info->ramp_down = pdata->ramp_down;

	if (info->ramp_down) {

		max8649_set_bits(info->i2c, MAX8649_RAMP, MAX8649_RAMP_DOWN,

				 MAX8649_RAMP_DOWN);

	}



	info->regulator = regulator_register(&dcdc_desc, &client->dev,

					     pdata->regulator, info);

	if (IS_ERR(info->regulator)) {

		dev_err(info->dev, "failed to register regulator %s\n",

			dcdc_desc.name);

		ret = PTR_ERR(info->regulator);

		goto out;

	}



	dev_info(info->dev, "Max8649 regulator device is detected.\n");

	return 0;

out:

	kfree(info);

	return ret;

}



static int __devexit max8649_regulator_remove(struct i2c_client *client)

{

	struct max8649_regulator_info *info = i2c_get_clientdata(client);



	if (info) {

		if (info->regulator)

			regulator_unregister(info->regulator);

		kfree(info);

	}

	i2c_set_clientdata(client, NULL);



	return 0;

}



static const struct i2c_device_id max8649_id[] = {

	{ "max8649", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, max8649_id);



static struct i2c_driver max8649_driver = {

	.probe		= max8649_regulator_probe,

	.remove		= __devexit_p(max8649_regulator_remove),

	.driver		= {

		.name	= "max8649",

	},

	.id_table	= max8649_id,

};



static int __init max8649_init(void)

{

	return i2c_add_driver(&max8649_driver);

}

subsys_initcall(max8649_init);



static void __exit max8649_exit(void)

{

	i2c_del_driver(&max8649_driver);

}

module_exit(max8649_exit);



/* Module information */

MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");

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

MODULE_LICENSE("GPL");

include/linux/regulator/max8649.h

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/*

 * Interface of Maxim max8649

 *

 * Copyright (C) 2009-2010 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.

 */



#ifndef __LINUX_REGULATOR_MAX8649_H

#define	__LINUX_REGULATOR_MAX8649_H



#include <linux/regulator/machine.h>



enum {

	MAX8649_EXTCLK_26MHZ = 0,

	MAX8649_EXTCLK_13MHZ,

	MAX8649_EXTCLK_19MHZ,	/* 19.2MHz */

};



enum {

	MAX8649_RAMP_32MV = 0,

	MAX8649_RAMP_16MV,

	MAX8649_RAMP_8MV,

	MAX8649_RAMP_4MV,

	MAX8649_RAMP_2MV,

	MAX8649_RAMP_1MV,

	MAX8649_RAMP_0_5MV,

	MAX8649_RAMP_0_25MV,

};



struct max8649_platform_data {

	struct regulator_init_data *regulator;



	unsigned	mode:2;		/* bit[1:0] = VID1,VID0 */

	unsigned	extclk_freq:2;

	unsigned	extclk:1;

	unsigned	ramp_timing:3;

	unsigned	ramp_down:1;

};



#endif	/* __LINUX_REGULATOR_MAX8649_H */