drivers/regulator/twl-regulator.c - kernel/msm-4.9 - Gitiles

 /*
  * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
  *
  * Copyright (C) 2008 David Brownell
  *
  * 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/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/i2c/twl.h>


 /*
  * The TWL4030/TW5030/TPS659x0/TWL6030 family chips include power management, a
  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
  * include an audio codec, battery charger, and more voltage regulators.
  * These chips are often used in OMAP-based systems.
  *
  * This driver implements software-based resource control for various
  * voltage regulators.  This is usually augmented with state machine
  * based control.
  */

 struct twlreg_info {
 	/* start of regulator's PM_RECEIVER control register bank */
 	u8			base;

 	/* twl resource ID, for resource control state machine */
 	u8			id;

 	/* voltage in mV = table[VSEL]; table_len must be a power-of-two */
 	u8			table_len;
 	const u16		*table;

 	/* regulator specific turn-on delay */
 	u16			delay;

 	/* State REMAP default configuration */
 	u8			remap;

 	/* chip constraints on regulator behavior */
 	u16			min_mV;
 	u16			max_mV;

 	/* used by regulator core */
 	struct regulator_desc	desc;
 };


 /* LDO control registers ... offset is from the base of its register bank.
  * The first three registers of all power resource banks help hardware to
  * manage the various resource groups.
  */
 /* Common offset in TWL4030/6030 */
 #define VREG_GRP		0
 /* TWL4030 register offsets */
 #define VREG_TYPE		1
 #define VREG_REMAP		2
 #define VREG_DEDICATED		3	/* LDO control */
 /* TWL6030 register offsets */
 #define VREG_TRANS		1
 #define VREG_STATE		2
 #define VREG_VOLTAGE		3
 /* TWL6030 Misc register offsets */
 #define VREG_BC_ALL		1
 #define VREG_BC_REF		2
 #define VREG_BC_PROC		3
 #define VREG_BC_CLK_RST		4

 static inline int
 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
 {
 	u8 value;
 	int status;

 	status = twl_i2c_read_u8(slave_subgp,
 			&value, info->base + offset);
 	return (status < 0) ? status : value;
 }

 static inline int
 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
 						 u8 value)
 {
 	return twl_i2c_write_u8(slave_subgp,
 			value, info->base + offset);
 }

 /*----------------------------------------------------------------------*/

 /* generic power resource operations, which work on all regulators */

 static int twlreg_grp(struct regulator_dev *rdev)
 {
 	return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
 								 VREG_GRP);
 }

 /*
  * Enable/disable regulators by joining/leaving the P1 (processor) group.
  * We assume nobody else is updating the DEV_GRP registers.
  */
 /* definition for 4030 family */
 #define P3_GRP_4030	BIT(7)		/* "peripherals" */
 #define P2_GRP_4030	BIT(6)		/* secondary processor, modem, etc */
 #define P1_GRP_4030	BIT(5)		/* CPU/Linux */
 /* definition for 6030 family */
 #define P3_GRP_6030	BIT(2)		/* secondary processor, modem, etc */
 #define P2_GRP_6030	BIT(1)		/* "peripherals" */
 #define P1_GRP_6030	BIT(0)		/* CPU/Linux */

 static int twlreg_is_enabled(struct regulator_dev *rdev)
 {
 	int	state = twlreg_grp(rdev);

 	if (state < 0)
 		return state;

 	if (twl_class_is_4030())
 		state &= P1_GRP_4030;
 	else
 		state &= P1_GRP_6030;
 	return state;
 }

 static int twlreg_enable(struct regulator_dev *rdev)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int			grp;
 	int			ret;

 	grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
 	if (grp < 0)
 		return grp;

 	if (twl_class_is_4030())
 		grp |= P1_GRP_4030;
 	else
 		grp |= P1_GRP_6030;

 	ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);

 	udelay(info->delay);

 	return ret;
 }

 static int twlreg_disable(struct regulator_dev *rdev)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int			grp;

 	grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
 	if (grp < 0)
 		return grp;

 	if (twl_class_is_4030())
 		grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
 	else
 		grp &= ~(P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030);

 	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 }

 static int twlreg_get_status(struct regulator_dev *rdev)
 {
 	int	state = twlreg_grp(rdev);

 	if (twl_class_is_6030())
 		return 0; /* FIXME return for 6030 regulator */

 	if (state < 0)
 		return state;
 	state &= 0x0f;

 	/* assume state != WARM_RESET; we'd not be running...  */
 	if (!state)
 		return REGULATOR_STATUS_OFF;
 	return (state & BIT(3))
 		? REGULATOR_STATUS_NORMAL
 		: REGULATOR_STATUS_STANDBY;
 }

 static int twlreg_set_mode(struct regulator_dev *rdev, unsigned mode)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	unsigned		message;
 	int			status;

 	if (twl_class_is_6030())
 		return 0; /* FIXME return for 6030 regulator */

 	/* We can only set the mode through state machine commands... */
 	switch (mode) {
 	case REGULATOR_MODE_NORMAL:
 		message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 		break;
 	case REGULATOR_MODE_STANDBY:
 		message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* Ensure the resource is associated with some group */
 	status = twlreg_grp(rdev);
 	if (status < 0)
 		return status;
 	if (!(status & (P3_GRP_4030 | P2_GRP_4030 | P1_GRP_4030)))
 		return -EACCES;

 	status = twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
 			message >> 8, TWL4030_PM_MASTER_PB_WORD_MSB);
 	if (status < 0)
 		return status;

 	return twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
 			message & 0xff, TWL4030_PM_MASTER_PB_WORD_LSB);
 }

 /*----------------------------------------------------------------------*/

 /*
  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
  * select field in its control register.   We use tables indexed by VSEL
  * to record voltages in milliVolts.  (Accuracy is about three percent.)
  *
  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
  * currently handled by listing two slightly different VAUX2 regulators,
  * only one of which will be configured.
  *
  * VSEL values documented as "TI cannot support these values" are flagged
  * in these tables as UNSUP() values; we normally won't assign them.
  *
  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
  */
 #ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
 #define UNSUP_MASK	0x0000
 #else
 #define UNSUP_MASK	0x8000
 #endif

 #define UNSUP(x)	(UNSUP_MASK | (x))
 #define IS_UNSUP(x)	(UNSUP_MASK & (x))
 #define LDO_MV(x)	(~UNSUP_MASK & (x))


 static const u16 VAUX1_VSEL_table[] = {
 	UNSUP(1500), UNSUP(1800), 2500, 2800,
 	3000, 3000, 3000, 3000,
 };
 static const u16 VAUX2_4030_VSEL_table[] = {
 	UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 	1500, 1800, UNSUP(1850), 2500,
 	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 };
 static const u16 VAUX2_VSEL_table[] = {
 	1700, 1700, 1900, 1300,
 	1500, 1800, 2000, 2500,
 	2100, 2800, 2200, 2300,
 	2400, 2400, 2400, 2400,
 };
 static const u16 VAUX3_VSEL_table[] = {
 	1500, 1800, 2500, 2800,
 	3000, 3000, 3000, 3000,
 };
 static const u16 VAUX4_VSEL_table[] = {
 	700, 1000, 1200, UNSUP(1300),
 	1500, 1800, UNSUP(1850), 2500,
 	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 };
 static const u16 VMMC1_VSEL_table[] = {
 	1850, 2850, 3000, 3150,
 };
 static const u16 VMMC2_VSEL_table[] = {
 	UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 	UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 	2600, 2800, 2850, 3000,
 	3150, 3150, 3150, 3150,
 };
 static const u16 VPLL1_VSEL_table[] = {
 	1000, 1200, 1300, 1800,
 	UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 };
 static const u16 VPLL2_VSEL_table[] = {
 	700, 1000, 1200, 1300,
 	UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 	UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 };
 static const u16 VSIM_VSEL_table[] = {
 	UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 	2800, 3000, 3000, 3000,
 };
 static const u16 VDAC_VSEL_table[] = {
 	1200, 1300, 1800, 1800,
 };
 static const u16 VDD1_VSEL_table[] = {
 	800, 1450,
 };
 static const u16 VDD2_VSEL_table[] = {
 	800, 1450, 1500,
 };
 static const u16 VIO_VSEL_table[] = {
 	1800, 1850,
 };
 static const u16 VINTANA2_VSEL_table[] = {
 	2500, 2750,
 };

 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int			mV = info->table[index];

 	return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
 }

 static int
 twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
 		       unsigned *selector)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int			vsel;

 	for (vsel = 0; vsel < info->table_len; vsel++) {
 		int mV = info->table[vsel];
 		int uV;

 		if (IS_UNSUP(mV))
 			continue;
 		uV = LDO_MV(mV) * 1000;

 		/* REVISIT for VAUX2, first match may not be best/lowest */

 		/* use the first in-range value */
 		if (min_uV <= uV && uV <= max_uV) {
 			*selector = vsel;
 			return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
 							VREG_VOLTAGE, vsel);
 		}
 	}

 	return -EDOM;
 }

 static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int		vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 								VREG_VOLTAGE);

 	if (vsel < 0)
 		return vsel;

 	vsel &= info->table_len - 1;
 	return LDO_MV(info->table[vsel]) * 1000;
 }

 static struct regulator_ops twl4030ldo_ops = {
 	.list_voltage	= twl4030ldo_list_voltage,

 	.set_voltage	= twl4030ldo_set_voltage,
 	.get_voltage	= twl4030ldo_get_voltage,

 	.enable		= twlreg_enable,
 	.disable	= twlreg_disable,
 	.is_enabled	= twlreg_is_enabled,

 	.set_mode	= twlreg_set_mode,

 	.get_status	= twlreg_get_status,
 };

 static int twl6030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);

 	return ((info->min_mV + (index * 100)) * 1000);
 }

 static int
 twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
 		       unsigned *selector)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int			vsel;

 	if ((min_uV/1000 < info->min_mV) || (max_uV/1000 > info->max_mV))
 		return -EDOM;

 	/*
 	 * Use the below formula to calculate vsel
 	 * mV = 1000mv + 100mv * (vsel - 1)
 	 */
 	vsel = (min_uV/1000 - 1000)/100 + 1;
 	*selector = vsel;
 	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, vsel);

 }

 static int twl6030ldo_get_voltage(struct regulator_dev *rdev)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);
 	int		vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 								VREG_VOLTAGE);

 	if (vsel < 0)
 		return vsel;

 	/*
 	 * Use the below formula to calculate vsel
 	 * mV = 1000mv + 100mv * (vsel - 1)
 	 */
 	return (1000 + (100 * (vsel - 1))) * 1000;
 }

 static struct regulator_ops twl6030ldo_ops = {
 	.list_voltage	= twl6030ldo_list_voltage,

 	.set_voltage	= twl6030ldo_set_voltage,
 	.get_voltage	= twl6030ldo_get_voltage,

 	.enable		= twlreg_enable,
 	.disable	= twlreg_disable,
 	.is_enabled	= twlreg_is_enabled,

 	.set_mode	= twlreg_set_mode,

 	.get_status	= twlreg_get_status,
 };

 /*----------------------------------------------------------------------*/

 /*
  * Fixed voltage LDOs don't have a VSEL field to update.
  */
 static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);

 	return info->min_mV * 1000;
 }

 static int twlfixed_get_voltage(struct regulator_dev *rdev)
 {
 	struct twlreg_info	*info = rdev_get_drvdata(rdev);

 	return info->min_mV * 1000;
 }

 static struct regulator_ops twlfixed_ops = {
 	.list_voltage	= twlfixed_list_voltage,

 	.get_voltage	= twlfixed_get_voltage,

 	.enable		= twlreg_enable,
 	.disable	= twlreg_disable,
 	.is_enabled	= twlreg_is_enabled,

 	.set_mode	= twlreg_set_mode,

 	.get_status	= twlreg_get_status,
 };

 static struct regulator_ops twl6030_fixed_resource = {
 	.enable		= twlreg_enable,
 	.disable	= twlreg_disable,
 	.is_enabled	= twlreg_is_enabled,
 	.get_status	= twlreg_get_status,
 };

 /*----------------------------------------------------------------------*/

 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 			remap_conf) \
 		TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 			remap_conf, TWL4030)
 #define TWL6030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 			remap_conf) \
 		TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 			remap_conf, TWL6030)

 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) { \
 	.base = offset, \
 	.id = num, \
 	.table_len = ARRAY_SIZE(label##_VSEL_table), \
 	.table = label##_VSEL_table, \
 	.delay = turnon_delay, \
 	.remap = remap_conf, \
 	.desc = { \
 		.name = #label, \
 		.id = TWL4030_REG_##label, \
 		.n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 		.ops = &twl4030ldo_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		}, \
 	}

 #define TWL6030_ADJUSTABLE_LDO(label, offset, min_mVolts, max_mVolts, num, \
 		remap_conf) { \
 	.base = offset, \
 	.id = num, \
 	.min_mV = min_mVolts, \
 	.max_mV = max_mVolts, \
 	.remap = remap_conf, \
 	.desc = { \
 		.name = #label, \
 		.id = TWL6030_REG_##label, \
 		.n_voltages = (max_mVolts - min_mVolts)/100, \
 		.ops = &twl6030ldo_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		}, \
 	}


 #define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
 		family) { \
 	.base = offset, \
 	.id = num, \
 	.min_mV = mVolts, \
 	.delay = turnon_delay, \
 	.remap = remap_conf, \
 	.desc = { \
 		.name = #label, \
 		.id = family##_REG_##label, \
 		.n_voltages = 1, \
 		.ops = &twlfixed_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		}, \
 	}

 #define TWL6030_FIXED_RESOURCE(label, offset, num, turnon_delay, remap_conf) { \
 	.base = offset, \
 	.id = num, \
 	.delay = turnon_delay, \
 	.remap = remap_conf, \
 	.desc = { \
 		.name = #label, \
 		.id = TWL6030_REG_##label, \
 		.ops = &twl6030_fixed_resource, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		}, \
 	}

 /*
  * We list regulators here if systems need some level of
  * software control over them after boot.
  */
 static struct twlreg_info twl_regs[] = {
 	TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00),
 	TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00),
 	TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08),
 	TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08),
 	TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VDD1, 0x55, 15, 1000, 0x08),
 	TWL4030_ADJUSTABLE_LDO(VDD2, 0x63, 16, 1000, 0x08),
 	TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08),
 	TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08),
 	TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08),
 	/* VUSBCP is managed *only* by the USB subchip */

 	/* 6030 REG with base as PMC Slave Misc : 0x0030 */
 	/* Turnon-delay and remap configuration values for 6030 are not
 	   verified since the specification is not public */
 	TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1000, 3300, 1, 0x21),
 	TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 1000, 3300, 2, 0x21),
 	TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 1000, 3300, 3, 0x21),
 	TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 1000, 3300, 4, 0x21),
 	TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 1000, 3300, 5, 0x21),
 	TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 1000, 3300, 7, 0x21),
 	TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15, 0, 0x21),
 	TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16, 0, 0x21),
 	TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17, 0, 0x21),
 	TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18, 0, 0x21),
 	TWL6030_FIXED_RESOURCE(CLK32KG, 0x8C, 48, 0, 0x21),
 };

 static int __devinit twlreg_probe(struct platform_device *pdev)
 {
 	int				i;
 	struct twlreg_info		*info;
 	struct regulator_init_data	*initdata;
 	struct regulation_constraints	*c;
 	struct regulator_dev		*rdev;

 	for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
 		if (twl_regs[i].desc.id != pdev->id)
 			continue;
 		info = twl_regs + i;
 		break;
 	}
 	if (!info)
 		return -ENODEV;

 	initdata = pdev->dev.platform_data;
 	if (!initdata)
 		return -EINVAL;

 	/* Constrain board-specific capabilities according to what
 	 * this driver and the chip itself can actually do.
 	 */
 	c = &initdata->constraints;
 	c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 	c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 				| REGULATOR_CHANGE_MODE
 				| REGULATOR_CHANGE_STATUS;
 	switch (pdev->id) {
 	case TWL4030_REG_VIO:
 	case TWL4030_REG_VDD1:
 	case TWL4030_REG_VDD2:
 	case TWL4030_REG_VPLL1:
 	case TWL4030_REG_VINTANA1:
 	case TWL4030_REG_VINTANA2:
 	case TWL4030_REG_VINTDIG:
 		c->always_on = true;
 		break;
 	default:
 		break;
 	}

 	rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
 	if (IS_ERR(rdev)) {
 		dev_err(&pdev->dev, "can't register %s, %ld\n",
 				info->desc.name, PTR_ERR(rdev));
 		return PTR_ERR(rdev);
 	}
 	platform_set_drvdata(pdev, rdev);

 	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP,
 						info->remap);

 	/* NOTE:  many regulators support short-circuit IRQs (presentable
 	 * as REGULATOR_OVER_CURRENT notifications?) configured via:
 	 *  - SC_CONFIG
 	 *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 	 *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 	 *  - IT_CONFIG
 	 */

 	return 0;
 }

 static int __devexit twlreg_remove(struct platform_device *pdev)
 {
 	regulator_unregister(platform_get_drvdata(pdev));
 	return 0;
 }

 MODULE_ALIAS("platform:twl_reg");

 static struct platform_driver twlreg_driver = {
 	.probe		= twlreg_probe,
 	.remove		= __devexit_p(twlreg_remove),
 	/* NOTE: short name, to work around driver model truncation of
 	 * "twl_regulator.12" (and friends) to "twl_regulator.1".
 	 */
 	.driver.name	= "twl_reg",
 	.driver.owner	= THIS_MODULE,
 };

 static int __init twlreg_init(void)
 {
 	return platform_driver_register(&twlreg_driver);
 }
 subsys_initcall(twlreg_init);

 static void __exit twlreg_exit(void)
 {
 	platform_driver_unregister(&twlreg_driver);
 }
 module_exit(twlreg_exit)

 MODULE_DESCRIPTION("TWL regulator driver");
 MODULE_LICENSE("GPL");
	/*
	* twl-regulator.c -- support regulators in twl4030/twl6030 family chips
	*
	* Copyright (C) 2008 David Brownell
	*
	* 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/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/i2c/twl.h>


	/*
	* The TWL4030/TW5030/TPS659x0/TWL6030 family chips include power management, a
	* USB OTG transceiver, an RTC, ADC, PWM, and lots more. Some versions
	* include an audio codec, battery charger, and more voltage regulators.
	* These chips are often used in OMAP-based systems.
	*
	* This driver implements software-based resource control for various
	* voltage regulators. This is usually augmented with state machine
	* based control.
	*/

	struct twlreg_info {
	/* start of regulator's PM_RECEIVER control register bank */
	u8 base;

	/* twl resource ID, for resource control state machine */
	u8 id;

	/* voltage in mV = table[VSEL]; table_len must be a power-of-two */
	u8 table_len;
	const u16 *table;

	/* regulator specific turn-on delay */
	u16 delay;

	/* State REMAP default configuration */
	u8 remap;

	/* chip constraints on regulator behavior */
	u16 min_mV;
	u16 max_mV;

	/* used by regulator core */
	struct regulator_desc desc;
	};


	/* LDO control registers ... offset is from the base of its register bank.
	* The first three registers of all power resource banks help hardware to
	* manage the various resource groups.
	*/
	/* Common offset in TWL4030/6030 */
	#define VREG_GRP 0
	/* TWL4030 register offsets */
	#define VREG_TYPE 1
	#define VREG_REMAP 2
	#define VREG_DEDICATED 3 /* LDO control */
	/* TWL6030 register offsets */
	#define VREG_TRANS 1
	#define VREG_STATE 2
	#define VREG_VOLTAGE 3
	/* TWL6030 Misc register offsets */
	#define VREG_BC_ALL 1
	#define VREG_BC_REF 2
	#define VREG_BC_PROC 3
	#define VREG_BC_CLK_RST 4

	static inline int
	twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
	{
	u8 value;
	int status;

	status = twl_i2c_read_u8(slave_subgp,
	&value, info->base + offset);
	return (status < 0) ? status : value;
	}

	static inline int
	twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
	u8 value)
	{
	return twl_i2c_write_u8(slave_subgp,
	value, info->base + offset);
	}

	/----------------------------------------------------------------------/

	/* generic power resource operations, which work on all regulators */

	static int twlreg_grp(struct regulator_dev *rdev)
	{
	return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
	VREG_GRP);
	}

	/*
	* Enable/disable regulators by joining/leaving the P1 (processor) group.
	* We assume nobody else is updating the DEV_GRP registers.
	*/
	/* definition for 4030 family */
	#define P3_GRP_4030 BIT(7) /* "peripherals" */
	#define P2_GRP_4030 BIT(6) /* secondary processor, modem, etc */
	#define P1_GRP_4030 BIT(5) /* CPU/Linux */
	/* definition for 6030 family */
	#define P3_GRP_6030 BIT(2) /* secondary processor, modem, etc */
	#define P2_GRP_6030 BIT(1) /* "peripherals" */
	#define P1_GRP_6030 BIT(0) /* CPU/Linux */

	static int twlreg_is_enabled(struct regulator_dev *rdev)
	{
	int state = twlreg_grp(rdev);

	if (state < 0)
	return state;

	if (twl_class_is_4030())
	state &= P1_GRP_4030;
	else
	state &= P1_GRP_6030;
	return state;
	}

	static int twlreg_enable(struct regulator_dev *rdev)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int grp;
	int ret;

	grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
	if (grp < 0)
	return grp;

	if (twl_class_is_4030())
	grp \|= P1_GRP_4030;
	else
	grp \|= P1_GRP_6030;

	ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);

	udelay(info->delay);

	return ret;
	}

	static int twlreg_disable(struct regulator_dev *rdev)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int grp;

	grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
	if (grp < 0)
	return grp;

	if (twl_class_is_4030())
	grp &= ~(P1_GRP_4030 \| P2_GRP_4030 \| P3_GRP_4030);
	else
	grp &= ~(P1_GRP_6030 \| P2_GRP_6030 \| P3_GRP_6030);

	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
	}

	static int twlreg_get_status(struct regulator_dev *rdev)
	{
	int state = twlreg_grp(rdev);

	if (twl_class_is_6030())
	return 0; /* FIXME return for 6030 regulator */

	if (state < 0)
	return state;
	state &= 0x0f;

	/* assume state != WARM_RESET; we'd not be running... */
	if (!state)
	return REGULATOR_STATUS_OFF;
	return (state & BIT(3))
	? REGULATOR_STATUS_NORMAL
	: REGULATOR_STATUS_STANDBY;
	}

	static int twlreg_set_mode(struct regulator_dev *rdev, unsigned mode)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	unsigned message;
	int status;

	if (twl_class_is_6030())
	return 0; /* FIXME return for 6030 regulator */

	/* We can only set the mode through state machine commands... */
	switch (mode) {
	case REGULATOR_MODE_NORMAL:
	message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
	break;
	case REGULATOR_MODE_STANDBY:
	message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
	break;
	default:
	return -EINVAL;
	}

	/* Ensure the resource is associated with some group */
	status = twlreg_grp(rdev);
	if (status < 0)
	return status;
	if (!(status & (P3_GRP_4030 \| P2_GRP_4030 \| P1_GRP_4030)))
	return -EACCES;

	status = twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
	message >> 8, TWL4030_PM_MASTER_PB_WORD_MSB);
	if (status < 0)
	return status;

	return twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
	message & 0xff, TWL4030_PM_MASTER_PB_WORD_LSB);
	}

	/----------------------------------------------------------------------/

	/*
	* Support for adjustable-voltage LDOs uses a four bit (or less) voltage
	* select field in its control register. We use tables indexed by VSEL
	* to record voltages in milliVolts. (Accuracy is about three percent.)
	*
	* Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
	* currently handled by listing two slightly different VAUX2 regulators,
	* only one of which will be configured.
	*
	* VSEL values documented as "TI cannot support these values" are flagged
	* in these tables as UNSUP() values; we normally won't assign them.
	*
	* VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
	* TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
	*/
	#ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
	#define UNSUP_MASK 0x0000
	#else
	#define UNSUP_MASK 0x8000
	#endif

	#define UNSUP(x) (UNSUP_MASK \| (x))
	#define IS_UNSUP(x) (UNSUP_MASK & (x))
	#define LDO_MV(x) (~UNSUP_MASK & (x))


	static const u16 VAUX1_VSEL_table[] = {
	UNSUP(1500), UNSUP(1800), 2500, 2800,
	3000, 3000, 3000, 3000,
	};
	static const u16 VAUX2_4030_VSEL_table[] = {
	UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
	1500, 1800, UNSUP(1850), 2500,
	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
	};
	static const u16 VAUX2_VSEL_table[] = {
	1700, 1700, 1900, 1300,
	1500, 1800, 2000, 2500,
	2100, 2800, 2200, 2300,
	2400, 2400, 2400, 2400,
	};
	static const u16 VAUX3_VSEL_table[] = {
	1500, 1800, 2500, 2800,
	3000, 3000, 3000, 3000,
	};
	static const u16 VAUX4_VSEL_table[] = {
	700, 1000, 1200, UNSUP(1300),
	1500, 1800, UNSUP(1850), 2500,
	UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
	};
	static const u16 VMMC1_VSEL_table[] = {
	1850, 2850, 3000, 3150,
	};
	static const u16 VMMC2_VSEL_table[] = {
	UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
	UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
	2600, 2800, 2850, 3000,
	3150, 3150, 3150, 3150,
	};
	static const u16 VPLL1_VSEL_table[] = {
	1000, 1200, 1300, 1800,
	UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
	};
	static const u16 VPLL2_VSEL_table[] = {
	700, 1000, 1200, 1300,
	UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
	UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
	UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
	};
	static const u16 VSIM_VSEL_table[] = {
	UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
	2800, 3000, 3000, 3000,
	};
	static const u16 VDAC_VSEL_table[] = {
	1200, 1300, 1800, 1800,
	};
	static const u16 VDD1_VSEL_table[] = {
	800, 1450,
	};
	static const u16 VDD2_VSEL_table[] = {
	800, 1450, 1500,
	};
	static const u16 VIO_VSEL_table[] = {
	1800, 1850,
	};
	static const u16 VINTANA2_VSEL_table[] = {
	2500, 2750,
	};

	static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int mV = info->table[index];

	return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
	}

	static int
	twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
	unsigned *selector)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int vsel;

	for (vsel = 0; vsel < info->table_len; vsel++) {
	int mV = info->table[vsel];
	int uV;

	if (IS_UNSUP(mV))
	continue;
	uV = LDO_MV(mV) * 1000;

	/* REVISIT for VAUX2, first match may not be best/lowest */

	/* use the first in-range value */
	if (min_uV <= uV && uV <= max_uV) {
	*selector = vsel;
	return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
	VREG_VOLTAGE, vsel);
	}
	}

	return -EDOM;
	}

	static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
	VREG_VOLTAGE);

	if (vsel < 0)
	return vsel;

	vsel &= info->table_len - 1;
	return LDO_MV(info->table[vsel]) * 1000;
	}

	static struct regulator_ops twl4030ldo_ops = {
	.list_voltage = twl4030ldo_list_voltage,

	.set_voltage = twl4030ldo_set_voltage,
	.get_voltage = twl4030ldo_get_voltage,

	.enable = twlreg_enable,
	.disable = twlreg_disable,
	.is_enabled = twlreg_is_enabled,

	.set_mode = twlreg_set_mode,

	.get_status = twlreg_get_status,
	};

	static int twl6030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);

	return ((info->min_mV + (index * 100)) * 1000);
	}

	static int
	twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
	unsigned *selector)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int vsel;

	if ((min_uV/1000 < info->min_mV) \|\| (max_uV/1000 > info->max_mV))
	return -EDOM;

	/*
	* Use the below formula to calculate vsel
	* mV = 1000mv + 100mv * (vsel - 1)
	*/
	vsel = (min_uV/1000 - 1000)/100 + 1;
	*selector = vsel;
	return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, vsel);

	}

	static int twl6030ldo_get_voltage(struct regulator_dev *rdev)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);
	int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
	VREG_VOLTAGE);

	if (vsel < 0)
	return vsel;

	/*
	* Use the below formula to calculate vsel
	* mV = 1000mv + 100mv * (vsel - 1)
	*/
	return (1000 + (100 * (vsel - 1))) * 1000;
	}

	static struct regulator_ops twl6030ldo_ops = {
	.list_voltage = twl6030ldo_list_voltage,

	.set_voltage = twl6030ldo_set_voltage,
	.get_voltage = twl6030ldo_get_voltage,

	.enable = twlreg_enable,
	.disable = twlreg_disable,
	.is_enabled = twlreg_is_enabled,

	.set_mode = twlreg_set_mode,

	.get_status = twlreg_get_status,
	};

	/----------------------------------------------------------------------/

	/*
	* Fixed voltage LDOs don't have a VSEL field to update.
	*/
	static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);

	return info->min_mV * 1000;
	}

	static int twlfixed_get_voltage(struct regulator_dev *rdev)
	{
	struct twlreg_info *info = rdev_get_drvdata(rdev);

	return info->min_mV * 1000;
	}

	static struct regulator_ops twlfixed_ops = {
	.list_voltage = twlfixed_list_voltage,

	.get_voltage = twlfixed_get_voltage,

	.enable = twlreg_enable,
	.disable = twlreg_disable,
	.is_enabled = twlreg_is_enabled,

	.set_mode = twlreg_set_mode,

	.get_status = twlreg_get_status,
	};

	static struct regulator_ops twl6030_fixed_resource = {
	.enable = twlreg_enable,
	.disable = twlreg_disable,
	.is_enabled = twlreg_is_enabled,
	.get_status = twlreg_get_status,
	};

	/----------------------------------------------------------------------/

	#define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
	remap_conf) \
	TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
	remap_conf, TWL4030)
	#define TWL6030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
	remap_conf) \
	TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
	remap_conf, TWL6030)

	#define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) { \
	.base = offset, \
	.id = num, \
	.table_len = ARRAY_SIZE(label##_VSEL_table), \
	.table = label##_VSEL_table, \
	.delay = turnon_delay, \
	.remap = remap_conf, \
	.desc = { \
	.name = #label, \
	.id = TWL4030_REG_##label, \
	.n_voltages = ARRAY_SIZE(label##_VSEL_table), \
	.ops = &twl4030ldo_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}, \
	}

	#define TWL6030_ADJUSTABLE_LDO(label, offset, min_mVolts, max_mVolts, num, \
	remap_conf) { \
	.base = offset, \
	.id = num, \
	.min_mV = min_mVolts, \
	.max_mV = max_mVolts, \
	.remap = remap_conf, \
	.desc = { \
	.name = #label, \
	.id = TWL6030_REG_##label, \
	.n_voltages = (max_mVolts - min_mVolts)/100, \
	.ops = &twl6030ldo_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}, \
	}


	#define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
	family) { \
	.base = offset, \
	.id = num, \
	.min_mV = mVolts, \
	.delay = turnon_delay, \
	.remap = remap_conf, \
	.desc = { \
	.name = #label, \
	.id = family##_REG_##label, \
	.n_voltages = 1, \
	.ops = &twlfixed_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}, \
	}

	#define TWL6030_FIXED_RESOURCE(label, offset, num, turnon_delay, remap_conf) { \
	.base = offset, \
	.id = num, \
	.delay = turnon_delay, \
	.remap = remap_conf, \
	.desc = { \
	.name = #label, \
	.id = TWL6030_REG_##label, \
	.ops = &twl6030_fixed_resource, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}, \
	}

	/*
	* We list regulators here if systems need some level of
	* software control over them after boot.
	*/
	static struct twlreg_info twl_regs[] = {
	TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00),
	TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00),
	TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08),
	TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08),
	TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08),
	TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08),
	TWL4030_ADJUSTABLE_LDO(VDD1, 0x55, 15, 1000, 0x08),
	TWL4030_ADJUSTABLE_LDO(VDD2, 0x63, 16, 1000, 0x08),
	TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08),
	TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08),
	TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08),
	/* VUSBCP is managed only by the USB subchip */

	/* 6030 REG with base as PMC Slave Misc : 0x0030 */
	/* Turnon-delay and remap configuration values for 6030 are not
	verified since the specification is not public */
	TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1000, 3300, 1, 0x21),
	TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 1000, 3300, 2, 0x21),
	TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 1000, 3300, 3, 0x21),
	TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 1000, 3300, 4, 0x21),
	TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 1000, 3300, 5, 0x21),
	TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 1000, 3300, 7, 0x21),
	TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15, 0, 0x21),
	TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16, 0, 0x21),
	TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17, 0, 0x21),
	TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18, 0, 0x21),
	TWL6030_FIXED_RESOURCE(CLK32KG, 0x8C, 48, 0, 0x21),
	};

	static int __devinit twlreg_probe(struct platform_device *pdev)
	{
	int i;
	struct twlreg_info *info;
	struct regulator_init_data *initdata;
	struct regulation_constraints *c;
	struct regulator_dev *rdev;

	for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
	if (twl_regs[i].desc.id != pdev->id)
	continue;
	info = twl_regs + i;
	break;
	}
	if (!info)
	return -ENODEV;

	initdata = pdev->dev.platform_data;
	if (!initdata)
	return -EINVAL;

	/* Constrain board-specific capabilities according to what
	* this driver and the chip itself can actually do.
	*/
	c = &initdata->constraints;
	c->valid_modes_mask &= REGULATOR_MODE_NORMAL \| REGULATOR_MODE_STANDBY;
	c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
	\| REGULATOR_CHANGE_MODE
	\| REGULATOR_CHANGE_STATUS;
	switch (pdev->id) {
	case TWL4030_REG_VIO:
	case TWL4030_REG_VDD1:
	case TWL4030_REG_VDD2:
	case TWL4030_REG_VPLL1:
	case TWL4030_REG_VINTANA1:
	case TWL4030_REG_VINTANA2:
	case TWL4030_REG_VINTDIG:
	c->always_on = true;
	break;
	default:
	break;
	}

	rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
	if (IS_ERR(rdev)) {
	dev_err(&pdev->dev, "can't register %s, %ld\n",
	info->desc.name, PTR_ERR(rdev));
	return PTR_ERR(rdev);
	}
	platform_set_drvdata(pdev, rdev);

	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP,
	info->remap);

	/* NOTE: many regulators support short-circuit IRQs (presentable
	* as REGULATOR_OVER_CURRENT notifications?) configured via:
	* - SC_CONFIG
	* - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
	* - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
	* - IT_CONFIG
	*/

	return 0;
	}

	static int __devexit twlreg_remove(struct platform_device *pdev)
	{
	regulator_unregister(platform_get_drvdata(pdev));
	return 0;
	}

	MODULE_ALIAS("platform:twl_reg");

	static struct platform_driver twlreg_driver = {
	.probe = twlreg_probe,
	.remove = __devexit_p(twlreg_remove),
	/* NOTE: short name, to work around driver model truncation of
	* "twl_regulator.12" (and friends) to "twl_regulator.1".
	*/
	.driver.name = "twl_reg",
	.driver.owner = THIS_MODULE,
	};

	static int __init twlreg_init(void)
	{
	return platform_driver_register(&twlreg_driver);
	}
	subsys_initcall(twlreg_init);

	static void __exit twlreg_exit(void)
	{
	platform_driver_unregister(&twlreg_driver);
	}
	module_exit(twlreg_exit)

	MODULE_DESCRIPTION("TWL regulator driver");
	MODULE_LICENSE("GPL");