drivers/regulator/pcf50633-regulator.c - third_party/linux - Git at Google

 /* NXP PCF50633 PMIC Driver
  *
  * (C) 2006-2008 by Openmoko, Inc.
  * Author: Balaji Rao <balajirrao@openmoko.org>
  * All rights reserved.
  *
  * Broken down from monstrous PCF50633 driver mainly by
  * Harald Welte and Andy Green and Werner Almesberger
  *
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>

 #include <linux/mfd/pcf50633/core.h>
 #include <linux/mfd/pcf50633/pmic.h>

 #define PCF50633_REGULATOR(_name, _id) 		\
 	{					\
 		.name = _name, 			\
 		.id = _id,			\
 		.ops = &pcf50633_regulator_ops,	\
 		.type = REGULATOR_VOLTAGE, 	\
 		.owner = THIS_MODULE, 		\
 	}

 static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
 	[PCF50633_REGULATOR_AUTO]	= PCF50633_REG_AUTOOUT,
 	[PCF50633_REGULATOR_DOWN1]	= PCF50633_REG_DOWN1OUT,
 	[PCF50633_REGULATOR_DOWN2]	= PCF50633_REG_DOWN2OUT,
 	[PCF50633_REGULATOR_MEMLDO]	= PCF50633_REG_MEMLDOOUT,
 	[PCF50633_REGULATOR_LDO1]	= PCF50633_REG_LDO1OUT,
 	[PCF50633_REGULATOR_LDO2]	= PCF50633_REG_LDO2OUT,
 	[PCF50633_REGULATOR_LDO3]	= PCF50633_REG_LDO3OUT,
 	[PCF50633_REGULATOR_LDO4]	= PCF50633_REG_LDO4OUT,
 	[PCF50633_REGULATOR_LDO5]	= PCF50633_REG_LDO5OUT,
 	[PCF50633_REGULATOR_LDO6]	= PCF50633_REG_LDO6OUT,
 	[PCF50633_REGULATOR_HCLDO]	= PCF50633_REG_HCLDOOUT,
 };

 /* Bits from voltage value */
 static u8 auto_voltage_bits(unsigned int millivolts)
 {
 	if (millivolts < 1800)
 		return 0;
 	if (millivolts > 3800)
 		return 0xff;

 	millivolts -= 625;

 	return millivolts / 25;
 }

 static u8 down_voltage_bits(unsigned int millivolts)
 {
 	if (millivolts < 625)
 		return 0;
 	else if (millivolts > 3000)
 		return 0xff;

 	millivolts -= 625;

 	return millivolts / 25;
 }

 static u8 ldo_voltage_bits(unsigned int millivolts)
 {
 	if (millivolts < 900)
 		return 0;
 	else if (millivolts > 3600)
 		return 0x1f;

 	millivolts -= 900;
 	return millivolts / 100;
 }

 /* Obtain voltage value from bits */
 static unsigned int auto_voltage_value(u8 bits)
 {
 	if (bits < 0x2f)
 		return 0;

 	return 625 + (bits * 25);
 }


 static unsigned int down_voltage_value(u8 bits)
 {
 	return 625 + (bits * 25);
 }


 static unsigned int ldo_voltage_value(u8 bits)
 {
 	bits &= 0x1f;

 	return 900 + (bits * 100);
 }

 static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
 						int min_uV, int max_uV)
 {
 	struct pcf50633 *pcf;
 	int regulator_id, millivolts;
 	u8 volt_bits, regnr;

 	pcf = rdev_get_drvdata(rdev);

 	regulator_id = rdev_get_id(rdev);
 	if (regulator_id >= PCF50633_NUM_REGULATORS)
 		return -EINVAL;

 	millivolts = min_uV / 1000;

 	regnr = pcf50633_regulator_registers[regulator_id];

 	switch (regulator_id) {
 	case PCF50633_REGULATOR_AUTO:
 		volt_bits = auto_voltage_bits(millivolts);
 		break;
 	case PCF50633_REGULATOR_DOWN1:
 		volt_bits = down_voltage_bits(millivolts);
 		break;
 	case PCF50633_REGULATOR_DOWN2:
 		volt_bits = down_voltage_bits(millivolts);
 		break;
 	case PCF50633_REGULATOR_LDO1:
 	case PCF50633_REGULATOR_LDO2:
 	case PCF50633_REGULATOR_LDO3:
 	case PCF50633_REGULATOR_LDO4:
 	case PCF50633_REGULATOR_LDO5:
 	case PCF50633_REGULATOR_LDO6:
 	case PCF50633_REGULATOR_HCLDO:
 		volt_bits = ldo_voltage_bits(millivolts);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return pcf50633_reg_write(pcf, regnr, volt_bits);
 }

 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
 {
 	struct pcf50633 *pcf;
 	int regulator_id, millivolts, volt_bits;
 	u8 regnr;

 	pcf = rdev_get_drvdata(rdev);;

 	regulator_id = rdev_get_id(rdev);
 	if (regulator_id >= PCF50633_NUM_REGULATORS)
 		return -EINVAL;

 	regnr = pcf50633_regulator_registers[regulator_id];

 	volt_bits = pcf50633_reg_read(pcf, regnr);
 	if (volt_bits < 0)
 		return -1;

 	switch (regulator_id) {
 	case PCF50633_REGULATOR_AUTO:
 		millivolts = auto_voltage_value(volt_bits);
 		break;
 	case PCF50633_REGULATOR_DOWN1:
 		millivolts = down_voltage_value(volt_bits);
 		break;
 	case PCF50633_REGULATOR_DOWN2:
 		millivolts = down_voltage_value(volt_bits);
 		break;
 	case PCF50633_REGULATOR_LDO1:
 	case PCF50633_REGULATOR_LDO2:
 	case PCF50633_REGULATOR_LDO3:
 	case PCF50633_REGULATOR_LDO4:
 	case PCF50633_REGULATOR_LDO5:
 	case PCF50633_REGULATOR_LDO6:
 	case PCF50633_REGULATOR_HCLDO:
 		millivolts = ldo_voltage_value(volt_bits);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return millivolts * 1000;
 }

 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 {
 	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 	int regulator_id;
 	u8 regnr;

 	regulator_id = rdev_get_id(rdev);
 	if (regulator_id >= PCF50633_NUM_REGULATORS)
 		return -EINVAL;

 	/* The *ENA register is always one after the *OUT register */
 	regnr = pcf50633_regulator_registers[regulator_id] + 1;

 	return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 						       PCF50633_REGULATOR_ON);
 }

 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 {
 	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 	int regulator_id;
 	u8 regnr;

 	regulator_id = rdev_get_id(rdev);
 	if (regulator_id >= PCF50633_NUM_REGULATORS)
 		return -EINVAL;

 	/* the *ENA register is always one after the *OUT register */
 	regnr = pcf50633_regulator_registers[regulator_id] + 1;

 	return pcf50633_reg_set_bit_mask(pcf, regnr,
 					PCF50633_REGULATOR_ON, 0);
 }

 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 {
 	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 	int regulator_id = rdev_get_id(rdev);
 	u8 regnr;

 	regulator_id = rdev_get_id(rdev);
 	if (regulator_id >= PCF50633_NUM_REGULATORS)
 		return -EINVAL;

 	/* the *ENA register is always one after the *OUT register */
 	regnr = pcf50633_regulator_registers[regulator_id] + 1;

 	return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 }

 static struct regulator_ops pcf50633_regulator_ops = {
 	.set_voltage = pcf50633_regulator_set_voltage,
 	.get_voltage = pcf50633_regulator_get_voltage,
 	.enable = pcf50633_regulator_enable,
 	.disable = pcf50633_regulator_disable,
 	.is_enabled = pcf50633_regulator_is_enabled,
 };

 static struct regulator_desc regulators[] = {
 	[PCF50633_REGULATOR_AUTO] =
 		PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
 	[PCF50633_REGULATOR_DOWN1] =
 		PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
 	[PCF50633_REGULATOR_DOWN2] =
 		PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
 	[PCF50633_REGULATOR_LDO1] =
 		PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
 	[PCF50633_REGULATOR_LDO2] =
 		PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
 	[PCF50633_REGULATOR_LDO3] =
 		PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
 	[PCF50633_REGULATOR_LDO4] =
 		PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
 	[PCF50633_REGULATOR_LDO5] =
 		PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
 	[PCF50633_REGULATOR_LDO6] =
 		PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
 	[PCF50633_REGULATOR_HCLDO] =
 		PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
 	[PCF50633_REGULATOR_MEMLDO] =
 		PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
 };

 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 {
 	struct regulator_dev *rdev;
 	struct pcf50633 *pcf;

 	/* Already set by core driver */
 	pcf = platform_get_drvdata(pdev);

 	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 				  pdev->dev.platform_data, pcf);
 	if (IS_ERR(rdev))
 		return PTR_ERR(rdev);

 	if (pcf->pdata->regulator_registered)
 		pcf->pdata->regulator_registered(pcf, pdev->id);

 	return 0;
 }

 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 {
 	struct regulator_dev *rdev = platform_get_drvdata(pdev);

 	regulator_unregister(rdev);

 	return 0;
 }

 static struct platform_driver pcf50633_regulator_driver = {
 	.driver = {
 		.name = "pcf50633-regltr",
 	},
 	.probe = pcf50633_regulator_probe,
 	.remove = __devexit_p(pcf50633_regulator_remove),
 };

 static int __init pcf50633_regulator_init(void)
 {
 	return platform_driver_register(&pcf50633_regulator_driver);
 }
 subsys_initcall(pcf50633_regulator_init);

 static void __exit pcf50633_regulator_exit(void)
 {
 	platform_driver_unregister(&pcf50633_regulator_driver);
 }
 module_exit(pcf50633_regulator_exit);

 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 MODULE_DESCRIPTION("PCF50633 regulator driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:pcf50633-regulator");
	/* NXP PCF50633 PMIC Driver
	*
	* (C) 2006-2008 by Openmoko, Inc.
	* Author: Balaji Rao <balajirrao@openmoko.org>
	* All rights reserved.
	*
	* Broken down from monstrous PCF50633 driver mainly by
	* Harald Welte and Andy Green and Werner Almesberger
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>

	#include <linux/mfd/pcf50633/core.h>
	#include <linux/mfd/pcf50633/pmic.h>

	#define PCF50633_REGULATOR(_name, _id) \
	{ \
	.name = _name, \
	.id = _id, \
	.ops = &pcf50633_regulator_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}

	static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
	[PCF50633_REGULATOR_AUTO] = PCF50633_REG_AUTOOUT,
	[PCF50633_REGULATOR_DOWN1] = PCF50633_REG_DOWN1OUT,
	[PCF50633_REGULATOR_DOWN2] = PCF50633_REG_DOWN2OUT,
	[PCF50633_REGULATOR_MEMLDO] = PCF50633_REG_MEMLDOOUT,
	[PCF50633_REGULATOR_LDO1] = PCF50633_REG_LDO1OUT,
	[PCF50633_REGULATOR_LDO2] = PCF50633_REG_LDO2OUT,
	[PCF50633_REGULATOR_LDO3] = PCF50633_REG_LDO3OUT,
	[PCF50633_REGULATOR_LDO4] = PCF50633_REG_LDO4OUT,
	[PCF50633_REGULATOR_LDO5] = PCF50633_REG_LDO5OUT,
	[PCF50633_REGULATOR_LDO6] = PCF50633_REG_LDO6OUT,
	[PCF50633_REGULATOR_HCLDO] = PCF50633_REG_HCLDOOUT,
	};

	/* Bits from voltage value */
	static u8 auto_voltage_bits(unsigned int millivolts)
	{
	if (millivolts < 1800)
	return 0;
	if (millivolts > 3800)
	return 0xff;

	millivolts -= 625;

	return millivolts / 25;
	}

	static u8 down_voltage_bits(unsigned int millivolts)
	{
	if (millivolts < 625)
	return 0;
	else if (millivolts > 3000)
	return 0xff;

	millivolts -= 625;

	return millivolts / 25;
	}

	static u8 ldo_voltage_bits(unsigned int millivolts)
	{
	if (millivolts < 900)
	return 0;
	else if (millivolts > 3600)
	return 0x1f;

	millivolts -= 900;
	return millivolts / 100;
	}

	/* Obtain voltage value from bits */
	static unsigned int auto_voltage_value(u8 bits)
	{
	if (bits < 0x2f)
	return 0;

	return 625 + (bits * 25);
	}


	static unsigned int down_voltage_value(u8 bits)
	{
	return 625 + (bits * 25);
	}


	static unsigned int ldo_voltage_value(u8 bits)
	{
	bits &= 0x1f;

	return 900 + (bits * 100);
	}

	static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV)
	{
	struct pcf50633 *pcf;
	int regulator_id, millivolts;
	u8 volt_bits, regnr;

	pcf = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
	return -EINVAL;

	millivolts = min_uV / 1000;

	regnr = pcf50633_regulator_registers[regulator_id];

	switch (regulator_id) {
	case PCF50633_REGULATOR_AUTO:
	volt_bits = auto_voltage_bits(millivolts);
	break;
	case PCF50633_REGULATOR_DOWN1:
	volt_bits = down_voltage_bits(millivolts);
	break;
	case PCF50633_REGULATOR_DOWN2:
	volt_bits = down_voltage_bits(millivolts);
	break;
	case PCF50633_REGULATOR_LDO1:
	case PCF50633_REGULATOR_LDO2:
	case PCF50633_REGULATOR_LDO3:
	case PCF50633_REGULATOR_LDO4:
	case PCF50633_REGULATOR_LDO5:
	case PCF50633_REGULATOR_LDO6:
	case PCF50633_REGULATOR_HCLDO:
	volt_bits = ldo_voltage_bits(millivolts);
	break;
	default:
	return -EINVAL;
	}

	return pcf50633_reg_write(pcf, regnr, volt_bits);
	}

	static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
	{
	struct pcf50633 *pcf;
	int regulator_id, millivolts, volt_bits;
	u8 regnr;

	pcf = rdev_get_drvdata(rdev);;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
	return -EINVAL;

	regnr = pcf50633_regulator_registers[regulator_id];

	volt_bits = pcf50633_reg_read(pcf, regnr);
	if (volt_bits < 0)
	return -1;

	switch (regulator_id) {
	case PCF50633_REGULATOR_AUTO:
	millivolts = auto_voltage_value(volt_bits);
	break;
	case PCF50633_REGULATOR_DOWN1:
	millivolts = down_voltage_value(volt_bits);
	break;
	case PCF50633_REGULATOR_DOWN2:
	millivolts = down_voltage_value(volt_bits);
	break;
	case PCF50633_REGULATOR_LDO1:
	case PCF50633_REGULATOR_LDO2:
	case PCF50633_REGULATOR_LDO3:
	case PCF50633_REGULATOR_LDO4:
	case PCF50633_REGULATOR_LDO5:
	case PCF50633_REGULATOR_LDO6:
	case PCF50633_REGULATOR_HCLDO:
	millivolts = ldo_voltage_value(volt_bits);
	break;
	default:
	return -EINVAL;
	}

	return millivolts * 1000;
	}

	static int pcf50633_regulator_enable(struct regulator_dev *rdev)
	{
	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
	int regulator_id;
	u8 regnr;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
	return -EINVAL;

	/* The ENA register is always one after the OUT register */
	regnr = pcf50633_regulator_registers[regulator_id] + 1;

	return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
	PCF50633_REGULATOR_ON);
	}

	static int pcf50633_regulator_disable(struct regulator_dev *rdev)
	{
	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
	int regulator_id;
	u8 regnr;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
	return -EINVAL;

	/* the ENA register is always one after the OUT register */
	regnr = pcf50633_regulator_registers[regulator_id] + 1;

	return pcf50633_reg_set_bit_mask(pcf, regnr,
	PCF50633_REGULATOR_ON, 0);
	}

	static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
	{
	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
	int regulator_id = rdev_get_id(rdev);
	u8 regnr;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
	return -EINVAL;

	/* the ENA register is always one after the OUT register */
	regnr = pcf50633_regulator_registers[regulator_id] + 1;

	return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
	}

	static struct regulator_ops pcf50633_regulator_ops = {
	.set_voltage = pcf50633_regulator_set_voltage,
	.get_voltage = pcf50633_regulator_get_voltage,
	.enable = pcf50633_regulator_enable,
	.disable = pcf50633_regulator_disable,
	.is_enabled = pcf50633_regulator_is_enabled,
	};

	static struct regulator_desc regulators[] = {
	[PCF50633_REGULATOR_AUTO] =
	PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
	[PCF50633_REGULATOR_DOWN1] =
	PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
	[PCF50633_REGULATOR_DOWN2] =
	PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
	[PCF50633_REGULATOR_LDO1] =
	PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
	[PCF50633_REGULATOR_LDO2] =
	PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
	[PCF50633_REGULATOR_LDO3] =
	PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
	[PCF50633_REGULATOR_LDO4] =
	PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
	[PCF50633_REGULATOR_LDO5] =
	PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
	[PCF50633_REGULATOR_LDO6] =
	PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
	[PCF50633_REGULATOR_HCLDO] =
	PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
	[PCF50633_REGULATOR_MEMLDO] =
	PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
	};

	static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
	{
	struct regulator_dev *rdev;
	struct pcf50633 *pcf;

	/* Already set by core driver */
	pcf = platform_get_drvdata(pdev);

	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
	pdev->dev.platform_data, pcf);
	if (IS_ERR(rdev))
	return PTR_ERR(rdev);

	if (pcf->pdata->regulator_registered)
	pcf->pdata->regulator_registered(pcf, pdev->id);

	return 0;
	}

	static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
	{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);

	return 0;
	}

	static struct platform_driver pcf50633_regulator_driver = {
	.driver = {
	.name = "pcf50633-regltr",
	},
	.probe = pcf50633_regulator_probe,
	.remove = __devexit_p(pcf50633_regulator_remove),
	};

	static int __init pcf50633_regulator_init(void)
	{
	return platform_driver_register(&pcf50633_regulator_driver);
	}
	subsys_initcall(pcf50633_regulator_init);

	static void __exit pcf50633_regulator_exit(void)
	{
	platform_driver_unregister(&pcf50633_regulator_driver);
	}
	module_exit(pcf50633_regulator_exit);

	MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
	MODULE_DESCRIPTION("PCF50633 regulator driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:pcf50633-regulator");