drivers/regulator/mc13892-regulator.c - kernel/mindspeed - Git at Google

 /*
  * Regulator Driver for Freescale MC13892 PMIC
  *
  * Copyright 2010 Yong Shen <yong.shen@linaro.org>
  *
  * Based on draft driver from Arnaud Patard <arnaud.patard@rtp-net.org>
  *
  * 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/mfd/mc13892.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/driver.h>
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include "mc13xxx.h"

 #define MC13892_REVISION			7

 #define MC13892_POWERCTL0			13
 #define MC13892_POWERCTL0_USEROFFSPI		3
 #define MC13892_POWERCTL0_VCOINCELLVSEL		20
 #define MC13892_POWERCTL0_VCOINCELLVSEL_M	(7<<20)
 #define MC13892_POWERCTL0_VCOINCELLEN		(1<<23)

 #define MC13892_SWITCHERS0_SWxHI		(1<<23)

 #define MC13892_SWITCHERS0			24
 #define MC13892_SWITCHERS0_SW1VSEL		0
 #define MC13892_SWITCHERS0_SW1VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS0_SW1HI		(1<<23)
 #define MC13892_SWITCHERS0_SW1EN		0

 #define MC13892_SWITCHERS1			25
 #define MC13892_SWITCHERS1_SW2VSEL		0
 #define MC13892_SWITCHERS1_SW2VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS1_SW2HI		(1<<23)
 #define MC13892_SWITCHERS1_SW2EN		0

 #define MC13892_SWITCHERS2			26
 #define MC13892_SWITCHERS2_SW3VSEL		0
 #define MC13892_SWITCHERS2_SW3VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS2_SW3HI		(1<<23)
 #define MC13892_SWITCHERS2_SW3EN		0

 #define MC13892_SWITCHERS3			27
 #define MC13892_SWITCHERS3_SW4VSEL		0
 #define MC13892_SWITCHERS3_SW4VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS3_SW4HI		(1<<23)
 #define MC13892_SWITCHERS3_SW4EN		0

 #define MC13892_SWITCHERS4			28
 #define MC13892_SWITCHERS4_SW1MODE		0
 #define MC13892_SWITCHERS4_SW1MODE_AUTO		(8<<0)
 #define MC13892_SWITCHERS4_SW1MODE_M		(0xf<<0)
 #define MC13892_SWITCHERS4_SW2MODE		10
 #define MC13892_SWITCHERS4_SW2MODE_AUTO		(8<<10)
 #define MC13892_SWITCHERS4_SW2MODE_M		(0xf<<10)

 #define MC13892_SWITCHERS5			29
 #define MC13892_SWITCHERS5_SW3MODE		0
 #define MC13892_SWITCHERS5_SW3MODE_AUTO		(8<<0)
 #define MC13892_SWITCHERS5_SW3MODE_M		(0xf<<0)
 #define MC13892_SWITCHERS5_SW4MODE		8
 #define MC13892_SWITCHERS5_SW4MODE_AUTO		(8<<8)
 #define MC13892_SWITCHERS5_SW4MODE_M		(0xf<<8)
 #define MC13892_SWITCHERS5_SWBSTEN		(1<<20)

 #define MC13892_REGULATORSETTING0		30
 #define MC13892_REGULATORSETTING0_VGEN1VSEL	0
 #define MC13892_REGULATORSETTING0_VDIGVSEL	4
 #define MC13892_REGULATORSETTING0_VGEN2VSEL	6
 #define MC13892_REGULATORSETTING0_VPLLVSEL	9
 #define MC13892_REGULATORSETTING0_VUSB2VSEL	11
 #define MC13892_REGULATORSETTING0_VGEN3VSEL	14
 #define MC13892_REGULATORSETTING0_VCAMVSEL	16

 #define MC13892_REGULATORSETTING0_VGEN1VSEL_M	(3<<0)
 #define MC13892_REGULATORSETTING0_VDIGVSEL_M	(3<<4)
 #define MC13892_REGULATORSETTING0_VGEN2VSEL_M	(7<<6)
 #define MC13892_REGULATORSETTING0_VPLLVSEL_M	(3<<9)
 #define MC13892_REGULATORSETTING0_VUSB2VSEL_M	(3<<11)
 #define MC13892_REGULATORSETTING0_VGEN3VSEL_M	(1<<14)
 #define MC13892_REGULATORSETTING0_VCAMVSEL_M	(3<<16)

 #define MC13892_REGULATORSETTING1		31
 #define MC13892_REGULATORSETTING1_VVIDEOVSEL	2
 #define MC13892_REGULATORSETTING1_VAUDIOVSEL	4
 #define MC13892_REGULATORSETTING1_VSDVSEL	6

 #define MC13892_REGULATORSETTING1_VVIDEOVSEL_M	(3<<2)
 #define MC13892_REGULATORSETTING1_VAUDIOVSEL_M	(3<<4)
 #define MC13892_REGULATORSETTING1_VSDVSEL_M	(7<<6)

 #define MC13892_REGULATORMODE0			32
 #define MC13892_REGULATORMODE0_VGEN1EN		(1<<0)
 #define MC13892_REGULATORMODE0_VGEN1STDBY	(1<<1)
 #define MC13892_REGULATORMODE0_VGEN1MODE	(1<<2)
 #define MC13892_REGULATORMODE0_VIOHIEN		(1<<3)
 #define MC13892_REGULATORMODE0_VIOHISTDBY	(1<<4)
 #define MC13892_REGULATORMODE0_VIOHIMODE	(1<<5)
 #define MC13892_REGULATORMODE0_VDIGEN		(1<<9)
 #define MC13892_REGULATORMODE0_VDIGSTDBY	(1<<10)
 #define MC13892_REGULATORMODE0_VDIGMODE		(1<<11)
 #define MC13892_REGULATORMODE0_VGEN2EN		(1<<12)
 #define MC13892_REGULATORMODE0_VGEN2STDBY	(1<<13)
 #define MC13892_REGULATORMODE0_VGEN2MODE	(1<<14)
 #define MC13892_REGULATORMODE0_VPLLEN		(1<<15)
 #define MC13892_REGULATORMODE0_VPLLSTDBY	(1<<16)
 #define MC13892_REGULATORMODE0_VPLLMODE		(1<<17)
 #define MC13892_REGULATORMODE0_VUSB2EN		(1<<18)
 #define MC13892_REGULATORMODE0_VUSB2STDBY	(1<<19)
 #define MC13892_REGULATORMODE0_VUSB2MODE	(1<<20)

 #define MC13892_REGULATORMODE1			33
 #define MC13892_REGULATORMODE1_VGEN3EN		(1<<0)
 #define MC13892_REGULATORMODE1_VGEN3STDBY	(1<<1)
 #define MC13892_REGULATORMODE1_VGEN3MODE	(1<<2)
 #define MC13892_REGULATORMODE1_VCAMEN		(1<<6)
 #define MC13892_REGULATORMODE1_VCAMSTDBY	(1<<7)
 #define MC13892_REGULATORMODE1_VCAMMODE		(1<<8)
 #define MC13892_REGULATORMODE1_VCAMCONFIGEN	(1<<9)
 #define MC13892_REGULATORMODE1_VVIDEOEN		(1<<12)
 #define MC13892_REGULATORMODE1_VVIDEOSTDBY	(1<<13)
 #define MC13892_REGULATORMODE1_VVIDEOMODE	(1<<14)
 #define MC13892_REGULATORMODE1_VAUDIOEN		(1<<15)
 #define MC13892_REGULATORMODE1_VAUDIOSTDBY	(1<<16)
 #define MC13892_REGULATORMODE1_VAUDIOMODE	(1<<17)
 #define MC13892_REGULATORMODE1_VSDEN		(1<<18)
 #define MC13892_REGULATORMODE1_VSDSTDBY		(1<<19)
 #define MC13892_REGULATORMODE1_VSDMODE		(1<<20)

 #define MC13892_POWERMISC			34
 #define MC13892_POWERMISC_GPO1EN		(1<<6)
 #define MC13892_POWERMISC_GPO2EN		(1<<8)
 #define MC13892_POWERMISC_GPO3EN		(1<<10)
 #define MC13892_POWERMISC_GPO4EN		(1<<12)
 #define MC13892_POWERMISC_PWGT1SPIEN		(1<<15)
 #define MC13892_POWERMISC_PWGT2SPIEN		(1<<16)
 #define MC13892_POWERMISC_GPO4ADINEN		(1<<21)

 #define MC13892_POWERMISC_PWGTSPI_M		(3 << 15)

 #define MC13892_USB1				50
 #define MC13892_USB1_VUSBEN			(1<<3)

 static const int mc13892_vcoincell[] = {
 	2500000, 2700000, 2800000, 2900000, 3000000, 3100000,
 	3200000, 3300000,
 };

 static const int mc13892_sw1[] = {
 	600000,   625000,  650000,  675000,  700000,  725000,
 	750000,   775000,  800000,  825000,  850000,  875000,
 	900000,   925000,  950000,  975000, 1000000, 1025000,
 	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
 	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
 	1350000, 1375000
 };

 static const int mc13892_sw[] = {
 	600000,   625000,  650000,  675000,  700000,  725000,
 	750000,   775000,  800000,  825000,  850000,  875000,
 	900000,   925000,  950000,  975000, 1000000, 1025000,
 	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
 	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
 	1350000, 1375000, 1400000, 1425000, 1450000, 1475000,
 	1500000, 1525000, 1550000, 1575000, 1600000, 1625000,
 	1650000, 1675000, 1700000, 1725000, 1750000, 1775000,
 	1800000, 1825000, 1850000, 1875000
 };

 static const int mc13892_swbst[] = {
 	5000000,
 };

 static const int mc13892_viohi[] = {
 	2775000,
 };

 static const int mc13892_vpll[] = {
 	1050000, 1250000, 1650000, 1800000,
 };

 static const int mc13892_vdig[] = {
 	1050000, 1250000, 1650000, 1800000,
 };

 static const int mc13892_vsd[] = {
 	1800000, 2000000, 2600000, 2700000,
 	2800000, 2900000, 3000000, 3150000,
 };

 static const int mc13892_vusb2[] = {
 	2400000, 2600000, 2700000, 2775000,
 };

 static const int mc13892_vvideo[] = {
 	2700000, 2775000, 2500000, 2600000,
 };

 static const int mc13892_vaudio[] = {
 	2300000, 2500000, 2775000, 3000000,
 };

 static const int mc13892_vcam[] = {
 	2500000, 2600000, 2750000, 3000000,
 };

 static const int mc13892_vgen1[] = {
 	1200000, 1500000, 2775000, 3150000,
 };

 static const int mc13892_vgen2[] = {
 	1200000, 1500000, 1600000, 1800000,
 	2700000, 2800000, 3000000, 3150000,
 };

 static const int mc13892_vgen3[] = {
 	1800000, 2900000,
 };

 static const int mc13892_vusb[] = {
 	3300000,
 };

 static const int mc13892_gpo[] = {
 	2750000,
 };

 static const int mc13892_pwgtdrv[] = {
 	5000000,
 };

 static struct regulator_ops mc13892_gpo_regulator_ops;
 /* sw regulators need special care due to the "hi bit" */
 static struct regulator_ops mc13892_sw_regulator_ops;


 #define MC13892_FIXED_DEFINE(name, reg, voltages)		\
 	MC13xxx_FIXED_DEFINE(MC13892_, name, reg, voltages,	\
 			mc13xxx_fixed_regulator_ops)

 #define MC13892_GPO_DEFINE(name, reg, voltages)			\
 	MC13xxx_GPO_DEFINE(MC13892_, name, reg, voltages,	\
 			mc13892_gpo_regulator_ops)

 #define MC13892_SW_DEFINE(name, reg, vsel_reg, voltages)	\
 	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
 			mc13892_sw_regulator_ops)

 #define MC13892_DEFINE_REGU(name, reg, vsel_reg, voltages)	\
 	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
 			mc13xxx_regulator_ops)

 static struct mc13xxx_regulator mc13892_regulators[] = {
 	MC13892_DEFINE_REGU(VCOINCELL, POWERCTL0, POWERCTL0, mc13892_vcoincell),
 	MC13892_SW_DEFINE(SW1, SWITCHERS0, SWITCHERS0, mc13892_sw1),
 	MC13892_SW_DEFINE(SW2, SWITCHERS1, SWITCHERS1, mc13892_sw),
 	MC13892_SW_DEFINE(SW3, SWITCHERS2, SWITCHERS2, mc13892_sw),
 	MC13892_SW_DEFINE(SW4, SWITCHERS3, SWITCHERS3, mc13892_sw),
 	MC13892_FIXED_DEFINE(SWBST, SWITCHERS5, mc13892_swbst),
 	MC13892_FIXED_DEFINE(VIOHI, REGULATORMODE0, mc13892_viohi),
 	MC13892_DEFINE_REGU(VPLL, REGULATORMODE0, REGULATORSETTING0,	\
 		mc13892_vpll),
 	MC13892_DEFINE_REGU(VDIG, REGULATORMODE0, REGULATORSETTING0,	\
 		mc13892_vdig),
 	MC13892_DEFINE_REGU(VSD, REGULATORMODE1, REGULATORSETTING1,	\
 		mc13892_vsd),
 	MC13892_DEFINE_REGU(VUSB2, REGULATORMODE0, REGULATORSETTING0,	\
 		mc13892_vusb2),
 	MC13892_DEFINE_REGU(VVIDEO, REGULATORMODE1, REGULATORSETTING1,	\
 		mc13892_vvideo),
 	MC13892_DEFINE_REGU(VAUDIO, REGULATORMODE1, REGULATORSETTING1,	\
 		mc13892_vaudio),
 	MC13892_DEFINE_REGU(VCAM, REGULATORMODE1, REGULATORSETTING0,	\
 		mc13892_vcam),
 	MC13892_DEFINE_REGU(VGEN1, REGULATORMODE0, REGULATORSETTING0,	\
 		mc13892_vgen1),
 	MC13892_DEFINE_REGU(VGEN2, REGULATORMODE0, REGULATORSETTING0,	\
 		mc13892_vgen2),
 	MC13892_DEFINE_REGU(VGEN3, REGULATORMODE1, REGULATORSETTING0,	\
 		mc13892_vgen3),
 	MC13892_FIXED_DEFINE(VUSB, USB1, mc13892_vusb),
 	MC13892_GPO_DEFINE(GPO1, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(GPO2, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(GPO3, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(GPO4, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(PWGT1SPI, POWERMISC, mc13892_pwgtdrv),
 	MC13892_GPO_DEFINE(PWGT2SPI, POWERMISC, mc13892_pwgtdrv),
 };

 static int mc13892_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
 				 u32 val)
 {
 	struct mc13xxx *mc13892 = priv->mc13xxx;
 	int ret;
 	u32 valread;

 	BUG_ON(val & ~mask);

 	ret = mc13xxx_reg_read(mc13892, MC13892_POWERMISC, &valread);
 	if (ret)
 		return ret;

 	/* Update the stored state for Power Gates. */
 	priv->powermisc_pwgt_state =
 		(priv->powermisc_pwgt_state & ~mask) | val;
 	priv->powermisc_pwgt_state &= MC13892_POWERMISC_PWGTSPI_M;

 	/* Construct the new register value */
 	valread = (valread & ~mask) | val;
 	/* Overwrite the PWGTxEN with the stored version */
 	valread = (valread & ~MC13892_POWERMISC_PWGTSPI_M) |
 		priv->powermisc_pwgt_state;

 	return mc13xxx_reg_write(mc13892, MC13892_POWERMISC, valread);
 }

 static int mc13892_gpo_regulator_enable(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int id = rdev_get_id(rdev);
 	int ret;
 	u32 en_val = mc13892_regulators[id].enable_bit;
 	u32 mask = mc13892_regulators[id].enable_bit;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	/* Power Gate enable value is 0 */
 	if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
 		en_val = 0;

 	if (id == MC13892_GPO4)
 		mask |= MC13892_POWERMISC_GPO4ADINEN;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13892_powermisc_rmw(priv, mask, en_val);
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static int mc13892_gpo_regulator_disable(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int id = rdev_get_id(rdev);
 	int ret;
 	u32 dis_val = 0;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	/* Power Gate disable value is 1 */
 	if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
 		dis_val = mc13892_regulators[id].enable_bit;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13892_powermisc_rmw(priv, mc13892_regulators[id].enable_bit,
 		dis_val);
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static int mc13892_gpo_regulator_is_enabled(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);
 	unsigned int val;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
 	mc13xxx_unlock(priv->mc13xxx);

 	if (ret)
 		return ret;

 	/* Power Gates state is stored in powermisc_pwgt_state
 	 * where the meaning of bits is negated */
 	val = (val & ~MC13892_POWERMISC_PWGTSPI_M) |
 		(priv->powermisc_pwgt_state ^ MC13892_POWERMISC_PWGTSPI_M);

 	return (val & mc13892_regulators[id].enable_bit) != 0;
 }


 static struct regulator_ops mc13892_gpo_regulator_ops = {
 	.enable = mc13892_gpo_regulator_enable,
 	.disable = mc13892_gpo_regulator_disable,
 	.is_enabled = mc13892_gpo_regulator_is_enabled,
 	.list_voltage = mc13xxx_regulator_list_voltage,
 	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
 	.get_voltage = mc13xxx_fixed_regulator_get_voltage,
 };

 static int mc13892_sw_regulator_get_voltage(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);
 	unsigned int val, hi;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx,
 		mc13892_regulators[id].vsel_reg, &val);
 	mc13xxx_unlock(priv->mc13xxx);
 	if (ret)
 		return ret;

 	hi  = val & MC13892_SWITCHERS0_SWxHI;
 	val = (val & mc13892_regulators[id].vsel_mask)
 		>> mc13892_regulators[id].vsel_shift;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);

 	if (hi)
 		val = (25000 * val) + 1100000;
 	else
 		val = (25000 * val) + 600000;

 	return val;
 }

 static int mc13892_sw_regulator_set_voltage(struct regulator_dev *rdev,
 		int min_uV, int max_uV, unsigned *selector)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int hi, value, mask, id = rdev_get_id(rdev);
 	u32 valread;
 	int ret;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 		__func__, id, min_uV, max_uV);

 	/* Find the best index */
 	value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
 	dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
 	if (value < 0)
 		return value;

 	value = mc13892_regulators[id].voltages[value];

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx,
 		mc13892_regulators[id].vsel_reg, &valread);
 	if (ret)
 		goto err;

 	if (value > 1375000)
 		hi = 1;
 	else if (value < 1100000)
 		hi = 0;
 	else
 		hi = valread & MC13892_SWITCHERS0_SWxHI;

 	if (hi) {
 		value = (value - 1100000) / 25000;
 		value |= MC13892_SWITCHERS0_SWxHI;
 	} else
 		value = (value - 600000) / 25000;

 	mask = mc13892_regulators[id].vsel_mask | MC13892_SWITCHERS0_SWxHI;
 	valread = (valread & ~mask) |
 			(value << mc13892_regulators[id].vsel_shift);
 	ret = mc13xxx_reg_write(priv->mc13xxx, mc13892_regulators[id].vsel_reg,
 			valread);
 err:
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static struct regulator_ops mc13892_sw_regulator_ops = {
 	.is_enabled = mc13xxx_sw_regulator_is_enabled,
 	.list_voltage = mc13xxx_regulator_list_voltage,
 	.set_voltage = mc13892_sw_regulator_set_voltage,
 	.get_voltage = mc13892_sw_regulator_get_voltage,
 };

 static int mc13892_vcam_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	unsigned int en_val = 0;
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);

 	if (mode == REGULATOR_MODE_FAST)
 		en_val = MC13892_REGULATORMODE1_VCAMCONFIGEN;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].reg,
 		MC13892_REGULATORMODE1_VCAMCONFIGEN, en_val);
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static unsigned int mc13892_vcam_get_mode(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);
 	unsigned int val;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
 	mc13xxx_unlock(priv->mc13xxx);

 	if (ret)
 		return ret;

 	if (val & MC13892_REGULATORMODE1_VCAMCONFIGEN)
 		return REGULATOR_MODE_FAST;

 	return REGULATOR_MODE_NORMAL;
 }


 static int __devinit mc13892_regulator_probe(struct platform_device *pdev)
 {
 	struct mc13xxx_regulator_priv *priv;
 	struct mc13xxx *mc13892 = dev_get_drvdata(pdev->dev.parent);
 	struct mc13xxx_regulator_platform_data *pdata =
 		dev_get_platdata(&pdev->dev);
 	struct mc13xxx_regulator_init_data *init_data;
 	int i, ret;
 	u32 val;

 	priv = kzalloc(sizeof(*priv) +
 		pdata->num_regulators * sizeof(priv->regulators[0]),
 		GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->mc13xxx_regulators = mc13892_regulators;
 	priv->mc13xxx = mc13892;

 	mc13xxx_lock(mc13892);
 	ret = mc13xxx_reg_read(mc13892, MC13892_REVISION, &val);
 	if (ret)
 		goto err_free;

 	/* enable switch auto mode */
 	if ((val & 0x0000FFFF) == 0x45d0) {
 		ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS4,
 			MC13892_SWITCHERS4_SW1MODE_M |
 			MC13892_SWITCHERS4_SW2MODE_M,
 			MC13892_SWITCHERS4_SW1MODE_AUTO |
 			MC13892_SWITCHERS4_SW2MODE_AUTO);
 		if (ret)
 			goto err_free;

 		ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS5,
 			MC13892_SWITCHERS5_SW3MODE_M |
 			MC13892_SWITCHERS5_SW4MODE_M,
 			MC13892_SWITCHERS5_SW3MODE_AUTO |
 			MC13892_SWITCHERS5_SW4MODE_AUTO);
 		if (ret)
 			goto err_free;
 	}
 	mc13xxx_unlock(mc13892);

 	mc13892_regulators[MC13892_VCAM].desc.ops->set_mode
 		= mc13892_vcam_set_mode;
 	mc13892_regulators[MC13892_VCAM].desc.ops->get_mode
 		= mc13892_vcam_get_mode;
 	for (i = 0; i < pdata->num_regulators; i++) {
 		init_data = &pdata->regulators[i];
 		priv->regulators[i] = regulator_register(
 			&mc13892_regulators[init_data->id].desc,
 			&pdev->dev, init_data->init_data, priv);

 		if (IS_ERR(priv->regulators[i])) {
 			dev_err(&pdev->dev, "failed to register regulator %s\n",
 				mc13892_regulators[i].desc.name);
 			ret = PTR_ERR(priv->regulators[i]);
 			goto err;
 		}
 	}

 	platform_set_drvdata(pdev, priv);

 	return 0;
 err:
 	while (--i >= 0)
 		regulator_unregister(priv->regulators[i]);

 err_free:
 	mc13xxx_unlock(mc13892);
 	kfree(priv);

 	return ret;
 }

 static int __devexit mc13892_regulator_remove(struct platform_device *pdev)
 {
 	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
 	struct mc13xxx_regulator_platform_data *pdata =
 		dev_get_platdata(&pdev->dev);
 	int i;

 	platform_set_drvdata(pdev, NULL);

 	for (i = 0; i < pdata->num_regulators; i++)
 		regulator_unregister(priv->regulators[i]);

 	kfree(priv);
 	return 0;
 }

 static struct platform_driver mc13892_regulator_driver = {
 	.driver	= {
 		.name	= "mc13892-regulator",
 		.owner	= THIS_MODULE,
 	},
 	.remove	= __devexit_p(mc13892_regulator_remove),
 	.probe	= mc13892_regulator_probe,
 };

 static int __init mc13892_regulator_init(void)
 {
 	return platform_driver_register(&mc13892_regulator_driver);
 }
 subsys_initcall(mc13892_regulator_init);

 static void __exit mc13892_regulator_exit(void)
 {
 	platform_driver_unregister(&mc13892_regulator_driver);
 }
 module_exit(mc13892_regulator_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13892 PMIC");
 MODULE_ALIAS("platform:mc13892-regulator");
	/*
	* Regulator Driver for Freescale MC13892 PMIC
	*
	* Copyright 2010 Yong Shen <yong.shen@linaro.org>
	*
	* Based on draft driver from Arnaud Patard <arnaud.patard@rtp-net.org>
	*
	* 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/mfd/mc13892.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/driver.h>
	#include <linux/platform_device.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include "mc13xxx.h"

	#define MC13892_REVISION 7

	#define MC13892_POWERCTL0 13
	#define MC13892_POWERCTL0_USEROFFSPI 3
	#define MC13892_POWERCTL0_VCOINCELLVSEL 20
	#define MC13892_POWERCTL0_VCOINCELLVSEL_M (7<<20)
	#define MC13892_POWERCTL0_VCOINCELLEN (1<<23)

	#define MC13892_SWITCHERS0_SWxHI (1<<23)

	#define MC13892_SWITCHERS0 24
	#define MC13892_SWITCHERS0_SW1VSEL 0
	#define MC13892_SWITCHERS0_SW1VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS0_SW1HI (1<<23)
	#define MC13892_SWITCHERS0_SW1EN 0

	#define MC13892_SWITCHERS1 25
	#define MC13892_SWITCHERS1_SW2VSEL 0
	#define MC13892_SWITCHERS1_SW2VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS1_SW2HI (1<<23)
	#define MC13892_SWITCHERS1_SW2EN 0

	#define MC13892_SWITCHERS2 26
	#define MC13892_SWITCHERS2_SW3VSEL 0
	#define MC13892_SWITCHERS2_SW3VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS2_SW3HI (1<<23)
	#define MC13892_SWITCHERS2_SW3EN 0

	#define MC13892_SWITCHERS3 27
	#define MC13892_SWITCHERS3_SW4VSEL 0
	#define MC13892_SWITCHERS3_SW4VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS3_SW4HI (1<<23)
	#define MC13892_SWITCHERS3_SW4EN 0

	#define MC13892_SWITCHERS4 28
	#define MC13892_SWITCHERS4_SW1MODE 0
	#define MC13892_SWITCHERS4_SW1MODE_AUTO (8<<0)
	#define MC13892_SWITCHERS4_SW1MODE_M (0xf<<0)
	#define MC13892_SWITCHERS4_SW2MODE 10
	#define MC13892_SWITCHERS4_SW2MODE_AUTO (8<<10)
	#define MC13892_SWITCHERS4_SW2MODE_M (0xf<<10)

	#define MC13892_SWITCHERS5 29
	#define MC13892_SWITCHERS5_SW3MODE 0
	#define MC13892_SWITCHERS5_SW3MODE_AUTO (8<<0)
	#define MC13892_SWITCHERS5_SW3MODE_M (0xf<<0)
	#define MC13892_SWITCHERS5_SW4MODE 8
	#define MC13892_SWITCHERS5_SW4MODE_AUTO (8<<8)
	#define MC13892_SWITCHERS5_SW4MODE_M (0xf<<8)
	#define MC13892_SWITCHERS5_SWBSTEN (1<<20)

	#define MC13892_REGULATORSETTING0 30
	#define MC13892_REGULATORSETTING0_VGEN1VSEL 0
	#define MC13892_REGULATORSETTING0_VDIGVSEL 4
	#define MC13892_REGULATORSETTING0_VGEN2VSEL 6
	#define MC13892_REGULATORSETTING0_VPLLVSEL 9
	#define MC13892_REGULATORSETTING0_VUSB2VSEL 11
	#define MC13892_REGULATORSETTING0_VGEN3VSEL 14
	#define MC13892_REGULATORSETTING0_VCAMVSEL 16

	#define MC13892_REGULATORSETTING0_VGEN1VSEL_M (3<<0)
	#define MC13892_REGULATORSETTING0_VDIGVSEL_M (3<<4)
	#define MC13892_REGULATORSETTING0_VGEN2VSEL_M (7<<6)
	#define MC13892_REGULATORSETTING0_VPLLVSEL_M (3<<9)
	#define MC13892_REGULATORSETTING0_VUSB2VSEL_M (3<<11)
	#define MC13892_REGULATORSETTING0_VGEN3VSEL_M (1<<14)
	#define MC13892_REGULATORSETTING0_VCAMVSEL_M (3<<16)

	#define MC13892_REGULATORSETTING1 31
	#define MC13892_REGULATORSETTING1_VVIDEOVSEL 2
	#define MC13892_REGULATORSETTING1_VAUDIOVSEL 4
	#define MC13892_REGULATORSETTING1_VSDVSEL 6

	#define MC13892_REGULATORSETTING1_VVIDEOVSEL_M (3<<2)
	#define MC13892_REGULATORSETTING1_VAUDIOVSEL_M (3<<4)
	#define MC13892_REGULATORSETTING1_VSDVSEL_M (7<<6)

	#define MC13892_REGULATORMODE0 32
	#define MC13892_REGULATORMODE0_VGEN1EN (1<<0)
	#define MC13892_REGULATORMODE0_VGEN1STDBY (1<<1)
	#define MC13892_REGULATORMODE0_VGEN1MODE (1<<2)
	#define MC13892_REGULATORMODE0_VIOHIEN (1<<3)
	#define MC13892_REGULATORMODE0_VIOHISTDBY (1<<4)
	#define MC13892_REGULATORMODE0_VIOHIMODE (1<<5)
	#define MC13892_REGULATORMODE0_VDIGEN (1<<9)
	#define MC13892_REGULATORMODE0_VDIGSTDBY (1<<10)
	#define MC13892_REGULATORMODE0_VDIGMODE (1<<11)
	#define MC13892_REGULATORMODE0_VGEN2EN (1<<12)
	#define MC13892_REGULATORMODE0_VGEN2STDBY (1<<13)
	#define MC13892_REGULATORMODE0_VGEN2MODE (1<<14)
	#define MC13892_REGULATORMODE0_VPLLEN (1<<15)
	#define MC13892_REGULATORMODE0_VPLLSTDBY (1<<16)
	#define MC13892_REGULATORMODE0_VPLLMODE (1<<17)
	#define MC13892_REGULATORMODE0_VUSB2EN (1<<18)
	#define MC13892_REGULATORMODE0_VUSB2STDBY (1<<19)
	#define MC13892_REGULATORMODE0_VUSB2MODE (1<<20)

	#define MC13892_REGULATORMODE1 33
	#define MC13892_REGULATORMODE1_VGEN3EN (1<<0)
	#define MC13892_REGULATORMODE1_VGEN3STDBY (1<<1)
	#define MC13892_REGULATORMODE1_VGEN3MODE (1<<2)
	#define MC13892_REGULATORMODE1_VCAMEN (1<<6)
	#define MC13892_REGULATORMODE1_VCAMSTDBY (1<<7)
	#define MC13892_REGULATORMODE1_VCAMMODE (1<<8)
	#define MC13892_REGULATORMODE1_VCAMCONFIGEN (1<<9)
	#define MC13892_REGULATORMODE1_VVIDEOEN (1<<12)
	#define MC13892_REGULATORMODE1_VVIDEOSTDBY (1<<13)
	#define MC13892_REGULATORMODE1_VVIDEOMODE (1<<14)
	#define MC13892_REGULATORMODE1_VAUDIOEN (1<<15)
	#define MC13892_REGULATORMODE1_VAUDIOSTDBY (1<<16)
	#define MC13892_REGULATORMODE1_VAUDIOMODE (1<<17)
	#define MC13892_REGULATORMODE1_VSDEN (1<<18)
	#define MC13892_REGULATORMODE1_VSDSTDBY (1<<19)
	#define MC13892_REGULATORMODE1_VSDMODE (1<<20)

	#define MC13892_POWERMISC 34
	#define MC13892_POWERMISC_GPO1EN (1<<6)
	#define MC13892_POWERMISC_GPO2EN (1<<8)
	#define MC13892_POWERMISC_GPO3EN (1<<10)
	#define MC13892_POWERMISC_GPO4EN (1<<12)
	#define MC13892_POWERMISC_PWGT1SPIEN (1<<15)
	#define MC13892_POWERMISC_PWGT2SPIEN (1<<16)
	#define MC13892_POWERMISC_GPO4ADINEN (1<<21)

	#define MC13892_POWERMISC_PWGTSPI_M (3 << 15)

	#define MC13892_USB1 50
	#define MC13892_USB1_VUSBEN (1<<3)

	static const int mc13892_vcoincell[] = {
	2500000, 2700000, 2800000, 2900000, 3000000, 3100000,
	3200000, 3300000,
	};

	static const int mc13892_sw1[] = {
	600000, 625000, 650000, 675000, 700000, 725000,
	750000, 775000, 800000, 825000, 850000, 875000,
	900000, 925000, 950000, 975000, 1000000, 1025000,
	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
	1350000, 1375000
	};

	static const int mc13892_sw[] = {
	600000, 625000, 650000, 675000, 700000, 725000,
	750000, 775000, 800000, 825000, 850000, 875000,
	900000, 925000, 950000, 975000, 1000000, 1025000,
	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
	1350000, 1375000, 1400000, 1425000, 1450000, 1475000,
	1500000, 1525000, 1550000, 1575000, 1600000, 1625000,
	1650000, 1675000, 1700000, 1725000, 1750000, 1775000,
	1800000, 1825000, 1850000, 1875000
	};

	static const int mc13892_swbst[] = {
	5000000,
	};

	static const int mc13892_viohi[] = {
	2775000,
	};

	static const int mc13892_vpll[] = {
	1050000, 1250000, 1650000, 1800000,
	};

	static const int mc13892_vdig[] = {
	1050000, 1250000, 1650000, 1800000,
	};

	static const int mc13892_vsd[] = {
	1800000, 2000000, 2600000, 2700000,
	2800000, 2900000, 3000000, 3150000,
	};

	static const int mc13892_vusb2[] = {
	2400000, 2600000, 2700000, 2775000,
	};

	static const int mc13892_vvideo[] = {
	2700000, 2775000, 2500000, 2600000,
	};

	static const int mc13892_vaudio[] = {
	2300000, 2500000, 2775000, 3000000,
	};

	static const int mc13892_vcam[] = {
	2500000, 2600000, 2750000, 3000000,
	};

	static const int mc13892_vgen1[] = {
	1200000, 1500000, 2775000, 3150000,
	};

	static const int mc13892_vgen2[] = {
	1200000, 1500000, 1600000, 1800000,
	2700000, 2800000, 3000000, 3150000,
	};

	static const int mc13892_vgen3[] = {
	1800000, 2900000,
	};

	static const int mc13892_vusb[] = {
	3300000,
	};

	static const int mc13892_gpo[] = {
	2750000,
	};

	static const int mc13892_pwgtdrv[] = {
	5000000,
	};

	static struct regulator_ops mc13892_gpo_regulator_ops;
	/* sw regulators need special care due to the "hi bit" */
	static struct regulator_ops mc13892_sw_regulator_ops;


	#define MC13892_FIXED_DEFINE(name, reg, voltages) \
	MC13xxx_FIXED_DEFINE(MC13892_, name, reg, voltages, \
	mc13xxx_fixed_regulator_ops)

	#define MC13892_GPO_DEFINE(name, reg, voltages) \
	MC13xxx_GPO_DEFINE(MC13892_, name, reg, voltages, \
	mc13892_gpo_regulator_ops)

	#define MC13892_SW_DEFINE(name, reg, vsel_reg, voltages) \
	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
	mc13892_sw_regulator_ops)

	#define MC13892_DEFINE_REGU(name, reg, vsel_reg, voltages) \
	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
	mc13xxx_regulator_ops)

	static struct mc13xxx_regulator mc13892_regulators[] = {
	MC13892_DEFINE_REGU(VCOINCELL, POWERCTL0, POWERCTL0, mc13892_vcoincell),
	MC13892_SW_DEFINE(SW1, SWITCHERS0, SWITCHERS0, mc13892_sw1),
	MC13892_SW_DEFINE(SW2, SWITCHERS1, SWITCHERS1, mc13892_sw),
	MC13892_SW_DEFINE(SW3, SWITCHERS2, SWITCHERS2, mc13892_sw),
	MC13892_SW_DEFINE(SW4, SWITCHERS3, SWITCHERS3, mc13892_sw),
	MC13892_FIXED_DEFINE(SWBST, SWITCHERS5, mc13892_swbst),
	MC13892_FIXED_DEFINE(VIOHI, REGULATORMODE0, mc13892_viohi),
	MC13892_DEFINE_REGU(VPLL, REGULATORMODE0, REGULATORSETTING0, \
	mc13892_vpll),
	MC13892_DEFINE_REGU(VDIG, REGULATORMODE0, REGULATORSETTING0, \
	mc13892_vdig),
	MC13892_DEFINE_REGU(VSD, REGULATORMODE1, REGULATORSETTING1, \
	mc13892_vsd),
	MC13892_DEFINE_REGU(VUSB2, REGULATORMODE0, REGULATORSETTING0, \
	mc13892_vusb2),
	MC13892_DEFINE_REGU(VVIDEO, REGULATORMODE1, REGULATORSETTING1, \
	mc13892_vvideo),
	MC13892_DEFINE_REGU(VAUDIO, REGULATORMODE1, REGULATORSETTING1, \
	mc13892_vaudio),
	MC13892_DEFINE_REGU(VCAM, REGULATORMODE1, REGULATORSETTING0, \
	mc13892_vcam),
	MC13892_DEFINE_REGU(VGEN1, REGULATORMODE0, REGULATORSETTING0, \
	mc13892_vgen1),
	MC13892_DEFINE_REGU(VGEN2, REGULATORMODE0, REGULATORSETTING0, \
	mc13892_vgen2),
	MC13892_DEFINE_REGU(VGEN3, REGULATORMODE1, REGULATORSETTING0, \
	mc13892_vgen3),
	MC13892_FIXED_DEFINE(VUSB, USB1, mc13892_vusb),
	MC13892_GPO_DEFINE(GPO1, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(GPO2, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(GPO3, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(GPO4, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(PWGT1SPI, POWERMISC, mc13892_pwgtdrv),
	MC13892_GPO_DEFINE(PWGT2SPI, POWERMISC, mc13892_pwgtdrv),
	};

	static int mc13892_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
	u32 val)
	{
	struct mc13xxx *mc13892 = priv->mc13xxx;
	int ret;
	u32 valread;

	BUG_ON(val & ~mask);

	ret = mc13xxx_reg_read(mc13892, MC13892_POWERMISC, &valread);
	if (ret)
	return ret;

	/* Update the stored state for Power Gates. */
	priv->powermisc_pwgt_state =
	(priv->powermisc_pwgt_state & ~mask) \| val;
	priv->powermisc_pwgt_state &= MC13892_POWERMISC_PWGTSPI_M;

	/* Construct the new register value */
	valread = (valread & ~mask) \| val;
	/* Overwrite the PWGTxEN with the stored version */
	valread = (valread & ~MC13892_POWERMISC_PWGTSPI_M) \|
	priv->powermisc_pwgt_state;

	return mc13xxx_reg_write(mc13892, MC13892_POWERMISC, valread);
	}

	static int mc13892_gpo_regulator_enable(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	int ret;
	u32 en_val = mc13892_regulators[id].enable_bit;
	u32 mask = mc13892_regulators[id].enable_bit;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	/* Power Gate enable value is 0 */
	if (id == MC13892_PWGT1SPI \|\| id == MC13892_PWGT2SPI)
	en_val = 0;

	if (id == MC13892_GPO4)
	mask \|= MC13892_POWERMISC_GPO4ADINEN;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13892_powermisc_rmw(priv, mask, en_val);
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static int mc13892_gpo_regulator_disable(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	int ret;
	u32 dis_val = 0;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	/* Power Gate disable value is 1 */
	if (id == MC13892_PWGT1SPI \|\| id == MC13892_PWGT2SPI)
	dis_val = mc13892_regulators[id].enable_bit;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13892_powermisc_rmw(priv, mc13892_regulators[id].enable_bit,
	dis_val);
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static int mc13892_gpo_regulator_is_enabled(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);
	unsigned int val;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
	return ret;

	/* Power Gates state is stored in powermisc_pwgt_state
	* where the meaning of bits is negated */
	val = (val & ~MC13892_POWERMISC_PWGTSPI_M) \|
	(priv->powermisc_pwgt_state ^ MC13892_POWERMISC_PWGTSPI_M);

	return (val & mc13892_regulators[id].enable_bit) != 0;
	}


	static struct regulator_ops mc13892_gpo_regulator_ops = {
	.enable = mc13892_gpo_regulator_enable,
	.disable = mc13892_gpo_regulator_disable,
	.is_enabled = mc13892_gpo_regulator_is_enabled,
	.list_voltage = mc13xxx_regulator_list_voltage,
	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
	.get_voltage = mc13xxx_fixed_regulator_get_voltage,
	};

	static int mc13892_sw_regulator_get_voltage(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);
	unsigned int val, hi;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx,
	mc13892_regulators[id].vsel_reg, &val);
	mc13xxx_unlock(priv->mc13xxx);
	if (ret)
	return ret;

	hi = val & MC13892_SWITCHERS0_SWxHI;
	val = (val & mc13892_regulators[id].vsel_mask)
	>> mc13892_regulators[id].vsel_shift;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);

	if (hi)
	val = (25000 * val) + 1100000;
	else
	val = (25000 * val) + 600000;

	return val;
	}

	static int mc13892_sw_regulator_set_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV, unsigned *selector)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int hi, value, mask, id = rdev_get_id(rdev);
	u32 valread;
	int ret;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
	__func__, id, min_uV, max_uV);

	/* Find the best index */
	value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
	dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
	if (value < 0)
	return value;

	value = mc13892_regulators[id].voltages[value];

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx,
	mc13892_regulators[id].vsel_reg, &valread);
	if (ret)
	goto err;

	if (value > 1375000)
	hi = 1;
	else if (value < 1100000)
	hi = 0;
	else
	hi = valread & MC13892_SWITCHERS0_SWxHI;

	if (hi) {
	value = (value - 1100000) / 25000;
	value \|= MC13892_SWITCHERS0_SWxHI;
	} else
	value = (value - 600000) / 25000;

	mask = mc13892_regulators[id].vsel_mask \| MC13892_SWITCHERS0_SWxHI;
	valread = (valread & ~mask) \|
	(value << mc13892_regulators[id].vsel_shift);
	ret = mc13xxx_reg_write(priv->mc13xxx, mc13892_regulators[id].vsel_reg,
	valread);
	err:
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static struct regulator_ops mc13892_sw_regulator_ops = {
	.is_enabled = mc13xxx_sw_regulator_is_enabled,
	.list_voltage = mc13xxx_regulator_list_voltage,
	.set_voltage = mc13892_sw_regulator_set_voltage,
	.get_voltage = mc13892_sw_regulator_get_voltage,
	};

	static int mc13892_vcam_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	unsigned int en_val = 0;
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);

	if (mode == REGULATOR_MODE_FAST)
	en_val = MC13892_REGULATORMODE1_VCAMCONFIGEN;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].reg,
	MC13892_REGULATORMODE1_VCAMCONFIGEN, en_val);
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static unsigned int mc13892_vcam_get_mode(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);
	unsigned int val;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
	return ret;

	if (val & MC13892_REGULATORMODE1_VCAMCONFIGEN)
	return REGULATOR_MODE_FAST;

	return REGULATOR_MODE_NORMAL;
	}


	static int __devinit mc13892_regulator_probe(struct platform_device *pdev)
	{
	struct mc13xxx_regulator_priv *priv;
	struct mc13xxx *mc13892 = dev_get_drvdata(pdev->dev.parent);
	struct mc13xxx_regulator_platform_data *pdata =
	dev_get_platdata(&pdev->dev);
	struct mc13xxx_regulator_init_data *init_data;
	int i, ret;
	u32 val;

	priv = kzalloc(sizeof(*priv) +
	pdata->num_regulators * sizeof(priv->regulators[0]),
	GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->mc13xxx_regulators = mc13892_regulators;
	priv->mc13xxx = mc13892;

	mc13xxx_lock(mc13892);
	ret = mc13xxx_reg_read(mc13892, MC13892_REVISION, &val);
	if (ret)
	goto err_free;

	/* enable switch auto mode */
	if ((val & 0x0000FFFF) == 0x45d0) {
	ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS4,
	MC13892_SWITCHERS4_SW1MODE_M \|
	MC13892_SWITCHERS4_SW2MODE_M,
	MC13892_SWITCHERS4_SW1MODE_AUTO \|
	MC13892_SWITCHERS4_SW2MODE_AUTO);
	if (ret)
	goto err_free;

	ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS5,
	MC13892_SWITCHERS5_SW3MODE_M \|
	MC13892_SWITCHERS5_SW4MODE_M,
	MC13892_SWITCHERS5_SW3MODE_AUTO \|
	MC13892_SWITCHERS5_SW4MODE_AUTO);
	if (ret)
	goto err_free;
	}
	mc13xxx_unlock(mc13892);

	mc13892_regulators[MC13892_VCAM].desc.ops->set_mode
	= mc13892_vcam_set_mode;
	mc13892_regulators[MC13892_VCAM].desc.ops->get_mode
	= mc13892_vcam_get_mode;
	for (i = 0; i < pdata->num_regulators; i++) {
	init_data = &pdata->regulators[i];
	priv->regulators[i] = regulator_register(
	&mc13892_regulators[init_data->id].desc,
	&pdev->dev, init_data->init_data, priv);

	if (IS_ERR(priv->regulators[i])) {
	dev_err(&pdev->dev, "failed to register regulator %s\n",
	mc13892_regulators[i].desc.name);
	ret = PTR_ERR(priv->regulators[i]);
	goto err;
	}
	}

	platform_set_drvdata(pdev, priv);

	return 0;
	err:
	while (--i >= 0)
	regulator_unregister(priv->regulators[i]);

	err_free:
	mc13xxx_unlock(mc13892);
	kfree(priv);

	return ret;
	}

	static int __devexit mc13892_regulator_remove(struct platform_device *pdev)
	{
	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
	struct mc13xxx_regulator_platform_data *pdata =
	dev_get_platdata(&pdev->dev);
	int i;

	platform_set_drvdata(pdev, NULL);

	for (i = 0; i < pdata->num_regulators; i++)
	regulator_unregister(priv->regulators[i]);

	kfree(priv);
	return 0;
	}

	static struct platform_driver mc13892_regulator_driver = {
	.driver = {
	.name = "mc13892-regulator",
	.owner = THIS_MODULE,
	},
	.remove = __devexit_p(mc13892_regulator_remove),
	.probe = mc13892_regulator_probe,
	};

	static int __init mc13892_regulator_init(void)
	{
	return platform_driver_register(&mc13892_regulator_driver);
	}
	subsys_initcall(mc13892_regulator_init);

	static void __exit mc13892_regulator_exit(void)
	{
	platform_driver_unregister(&mc13892_regulator_driver);
	}
	module_exit(mc13892_regulator_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
	MODULE_DESCRIPTION("Regulator Driver for Freescale MC13892 PMIC");
	MODULE_ALIAS("platform:mc13892-regulator");