/*
 * Split TWL6030 logic from twl-regulator.c:
 * Copyright (C) 2008 David Brownell
 *
 * Copyright (C) 2016 Nicolae Rosia <nicolae.rosia@gmail.com>
 * 
 * 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/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/twl.h>
#include <linux/delay.h>

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

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

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

        u8                      flags;

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

        /* chip specific features */
        unsigned long           features;

        /* data passed from board for external get/set voltage */
        void                    *data;
};


/* 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
/* TWL6030 register offsets */
#define VREG_TRANS              1
#define VREG_STATE              2
#define VREG_VOLTAGE            3
#define VREG_VOLTAGE_SMPS       4
/* 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

/* TWL6030 LDO register values for CFG_STATE */
#define TWL6030_CFG_STATE_OFF   0x00
#define TWL6030_CFG_STATE_ON    0x01
#define TWL6030_CFG_STATE_OFF2  0x02
#define TWL6030_CFG_STATE_SLEEP 0x03
#define TWL6030_CFG_STATE_GRP_SHIFT     5
#define TWL6030_CFG_STATE_APP_SHIFT     2
#define TWL6030_CFG_STATE_APP_MASK      (0x03 << TWL6030_CFG_STATE_APP_SHIFT)
#define TWL6030_CFG_STATE_APP(v)        (((v) & TWL6030_CFG_STATE_APP_MASK) >>\
                                                TWL6030_CFG_STATE_APP_SHIFT)

/* Flags for SMPS Voltage reading */
#define SMPS_OFFSET_EN          BIT(0)
#define SMPS_EXTENDED_EN        BIT(1)

/* twl6032 SMPS EPROM values */
#define TWL6030_SMPS_OFFSET             0xB0
#define TWL6030_SMPS_MULT               0xB3
#define SMPS_MULTOFFSET_SMPS4   BIT(0)
#define SMPS_MULTOFFSET_VIO     BIT(1)
#define SMPS_MULTOFFSET_SMPS3   BIT(6)

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 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 twl6030reg_is_enabled(struct regulator_dev *rdev)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);
        int                     grp = 0, val;

        if (!(twl_class_is_6030() && (info->features & TWL6032_SUBCLASS))) {
                grp = twlreg_grp(rdev);
                if (grp < 0)
                        return grp;
                grp &= P1_GRP_6030;
        } else {
                grp = 1;
        }

        val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE);
        val = TWL6030_CFG_STATE_APP(val);

        return grp && (val == TWL6030_CFG_STATE_ON);
}

#define PB_I2C_BUSY     BIT(0)
#define PB_I2C_BWEN     BIT(1)


static int twl6030reg_enable(struct regulator_dev *rdev)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);
        int                     grp = 0;
        int                     ret;

        if (!(twl_class_is_6030() && (info->features & TWL6032_SUBCLASS)))
                grp = twlreg_grp(rdev);
        if (grp < 0)
                return grp;

        ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_STATE,
                        grp << TWL6030_CFG_STATE_GRP_SHIFT |
                        TWL6030_CFG_STATE_ON);
        return ret;
}

static int twl6030reg_disable(struct regulator_dev *rdev)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);
        int                     grp = 0;
        int                     ret;

        if (!(twl_class_is_6030() && (info->features & TWL6032_SUBCLASS)))
                grp = P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030;

        /* For 6030, set the off state for all grps enabled */
        ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_STATE,
                        (grp) << TWL6030_CFG_STATE_GRP_SHIFT |
                        TWL6030_CFG_STATE_OFF);

        return ret;
}

static int twl6030reg_get_status(struct regulator_dev *rdev)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);
        int                     val;

        val = twlreg_grp(rdev);
        if (val < 0)
                return val;

        val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE);

        switch (TWL6030_CFG_STATE_APP(val)) {
        case TWL6030_CFG_STATE_ON:
                return REGULATOR_STATUS_NORMAL;

        case TWL6030_CFG_STATE_SLEEP:
                return REGULATOR_STATUS_STANDBY;

        case TWL6030_CFG_STATE_OFF:
        case TWL6030_CFG_STATE_OFF2:
        default:
                break;
        }

        return REGULATOR_STATUS_OFF;
}

static int twl6030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);
        int grp = 0;
        int val;

        if (!(twl_class_is_6030() && (info->features & TWL6032_SUBCLASS)))
                grp = twlreg_grp(rdev);

        if (grp < 0)
                return grp;

        /* Compose the state register settings */
        val = grp << TWL6030_CFG_STATE_GRP_SHIFT;
        /* We can only set the mode through state machine commands... */
        switch (mode) {
        case REGULATOR_MODE_NORMAL:
                val |= TWL6030_CFG_STATE_ON;
                break;
        case REGULATOR_MODE_STANDBY:
                val |= TWL6030_CFG_STATE_SLEEP;
                break;

        default:
                return -EINVAL;
        }

        return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_STATE, val);
}

static int twl6030coresmps_set_voltage(struct regulator_dev *rdev, int min_uV,
        int max_uV, unsigned *selector)
{
        return -ENODEV;
}

static int twl6030coresmps_get_voltage(struct regulator_dev *rdev)
{
        return -ENODEV;
}

static struct regulator_ops twl6030coresmps_ops = {
        .set_voltage    = twl6030coresmps_set_voltage,
        .get_voltage    = twl6030coresmps_get_voltage,
};

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

        switch (sel) {
        case 0:
                return 0;
        case 1 ... 24:
                /* Linear mapping from 00000001 to 00011000:
                 * Absolute voltage value = 1.0 V + 0.1 V × (sel – 00000001)
                 */
                return (info->min_mV + 100 * (sel - 1)) * 1000;
        case 25 ... 30:
                return -EINVAL;
        case 31:
                return 2750000;
        default:
                return -EINVAL;
        }
}

static int
twl6030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);

        return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
                            selector);
}

static int twl6030ldo_get_voltage_sel(struct regulator_dev *rdev)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);
        int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);

        return vsel;
}

static struct regulator_ops twl6030ldo_ops = {
        .list_voltage   = twl6030ldo_list_voltage,

        .set_voltage_sel = twl6030ldo_set_voltage_sel,
        .get_voltage_sel = twl6030ldo_get_voltage_sel,

        .enable         = twl6030reg_enable,
        .disable        = twl6030reg_disable,
        .is_enabled     = twl6030reg_is_enabled,

        .set_mode       = twl6030reg_set_mode,

        .get_status     = twl6030reg_get_status,
};

static struct regulator_ops twl6030fixed_ops = {
        .list_voltage   = regulator_list_voltage_linear,

        .enable         = twl6030reg_enable,
        .disable        = twl6030reg_disable,
        .is_enabled     = twl6030reg_is_enabled,

        .set_mode       = twl6030reg_set_mode,

        .get_status     = twl6030reg_get_status,
};

/*
 * SMPS status and control
 */

static int twl6030smps_list_voltage(struct regulator_dev *rdev, unsigned index)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);

        int voltage = 0;

        switch (info->flags) {
        case SMPS_OFFSET_EN:
                voltage = 100000;
                /* fall through */
        case 0:
                switch (index) {
                case 0:
                        voltage = 0;
                        break;
                case 58:
                        voltage = 1350 * 1000;
                        break;
                case 59:
                        voltage = 1500 * 1000;
                        break;
                case 60:
                        voltage = 1800 * 1000;
                        break;
                case 61:
                        voltage = 1900 * 1000;
                        break;
                case 62:
                        voltage = 2100 * 1000;
                        break;
                default:
                        voltage += (600000 + (12500 * (index - 1)));
                }
                break;
        case SMPS_EXTENDED_EN:
                switch (index) {
                case 0:
                        voltage = 0;
                        break;
                case 58:
                        voltage = 2084 * 1000;
                        break;
                case 59:
                        voltage = 2315 * 1000;
                        break;
                case 60:
                        voltage = 2778 * 1000;
                        break;
                case 61:
                        voltage = 2932 * 1000;
                        break;
                case 62:
                        voltage = 3241 * 1000;
                        break;
                default:
                        voltage = (1852000 + (38600 * (index - 1)));
                }
                break;
        case SMPS_OFFSET_EN | SMPS_EXTENDED_EN:
                switch (index) {
                case 0:
                        voltage = 0;
                        break;
                case 58:
                        voltage = 4167 * 1000;
                        break;
                case 59:
                        voltage = 2315 * 1000;
                        break;
                case 60:
                        voltage = 2778 * 1000;
                        break;
                case 61:
                        voltage = 2932 * 1000;
                        break;
                case 62:
                        voltage = 3241 * 1000;
                        break;
                default:
                        voltage = (2161000 + (38600 * (index - 1)));
                }
                break;
        }

        return voltage;
}

static int twl6030smps_map_voltage(struct regulator_dev *rdev, int min_uV,
                                   int max_uV)
{
        struct twlreg_info *info = rdev_get_drvdata(rdev);
        int vsel = 0;

        switch (info->flags) {
        case 0:
                if (min_uV == 0)
                        vsel = 0;
                else if ((min_uV >= 600000) && (min_uV <= 1300000)) {
                        vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
                        vsel++;
                }
                /* Values 1..57 for vsel are linear and can be calculated
                 * values 58..62 are non linear.
                 */
                else if ((min_uV > 1900000) && (min_uV <= 2100000))
                        vsel = 62;
                else if ((min_uV > 1800000) && (min_uV <= 1900000))
                        vsel = 61;
                else if ((min_uV > 1500000) && (min_uV <= 1800000))
                        vsel = 60;
                else if ((min_uV > 1350000) && (min_uV <= 1500000))
                        vsel = 59;
                else if ((min_uV > 1300000) && (min_uV <= 1350000))
                        vsel = 58;
                else
                        return -EINVAL;
                break;
        case SMPS_OFFSET_EN:
                if (min_uV == 0)
                        vsel = 0;
                else if ((min_uV >= 700000) && (min_uV <= 1420000)) {
                        vsel = DIV_ROUND_UP(min_uV - 700000, 12500);
                        vsel++;
                }
                /* Values 1..57 for vsel are linear and can be calculated
                 * values 58..62 are non linear.
                 */
                else if ((min_uV > 1900000) && (min_uV <= 2100000))
                        vsel = 62;
                else if ((min_uV > 1800000) && (min_uV <= 1900000))
                        vsel = 61;
                else if ((min_uV > 1500000) && (min_uV <= 1800000))
                        vsel = 60;
                else if ((min_uV > 1350000) && (min_uV <= 1500000))
                        vsel = 59;
                else
                        return -EINVAL;
                break;
        case SMPS_EXTENDED_EN:
                if (min_uV == 0) {
                        vsel = 0;
                } else if ((min_uV >= 1852000) && (max_uV <= 4013600)) {
                        vsel = DIV_ROUND_UP(min_uV - 1852000, 38600);
                        vsel++;
                }
                break;
        case SMPS_OFFSET_EN|SMPS_EXTENDED_EN:
                if (min_uV == 0) {
                        vsel = 0;
                } else if ((min_uV >= 2161000) && (min_uV <= 4321000)) {
                        vsel = DIV_ROUND_UP(min_uV - 2161000, 38600);
                        vsel++;
                }
                break;
        }

        return vsel;
}

static int twl6030smps_set_voltage_sel(struct regulator_dev *rdev,
                                       unsigned int selector)
{
        struct twlreg_info *info = rdev_get_drvdata(rdev);

        return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS,
                            selector);
}

static int twl6030smps_get_voltage_sel(struct regulator_dev *rdev)
{
        struct twlreg_info      *info = rdev_get_drvdata(rdev);

        return twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS);
}

static struct regulator_ops twlsmps_ops = {
        .list_voltage           = twl6030smps_list_voltage,
        .map_voltage            = twl6030smps_map_voltage,

        .set_voltage_sel        = twl6030smps_set_voltage_sel,
        .get_voltage_sel        = twl6030smps_get_voltage_sel,

        .enable                 = twl6030reg_enable,
        .disable                = twl6030reg_disable,
        .is_enabled             = twl6030reg_is_enabled,

        .set_mode               = twl6030reg_set_mode,

        .get_status             = twl6030reg_get_status,
};

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

#define TWL6030_ADJUSTABLE_SMPS(label) \
static const struct twlreg_info TWL6030_INFO_##label = { \
        .desc = { \
                .name = #label, \
                .id = TWL6030_REG_##label, \
                .ops = &twl6030coresmps_ops, \
                .type = REGULATOR_VOLTAGE, \
                .owner = THIS_MODULE, \
                }, \
        }

#define TWL6030_ADJUSTABLE_LDO(label, offset, min_mVolts) \
static const struct twlreg_info TWL6030_INFO_##label = { \
        .base = offset, \
        .min_mV = min_mVolts, \
        .desc = { \
                .name = #label, \
                .id = TWL6030_REG_##label, \
                .n_voltages = 32, \
                .ops = &twl6030ldo_ops, \
                .type = REGULATOR_VOLTAGE, \
                .owner = THIS_MODULE, \
                }, \
        }

#define TWL6032_ADJUSTABLE_LDO(label, offset, min_mVolts) \
static const struct twlreg_info TWL6032_INFO_##label = { \
        .base = offset, \
        .min_mV = min_mVolts, \
        .desc = { \
                .name = #label, \
                .id = TWL6032_REG_##label, \
                .n_voltages = 32, \
                .ops = &twl6030ldo_ops, \
                .type = REGULATOR_VOLTAGE, \
                .owner = THIS_MODULE, \
                }, \
        }

#define TWL6030_FIXED_LDO(label, offset, mVolts, turnon_delay) \
static const struct twlreg_info TWLFIXED_INFO_##label = { \
        .base = offset, \
        .id = 0, \
        .min_mV = mVolts, \
        .desc = { \
                .name = #label, \
                .id = TWL6030##_REG_##label, \
                .n_voltages = 1, \
                .ops = &twl6030fixed_ops, \
                .type = REGULATOR_VOLTAGE, \
                .owner = THIS_MODULE, \
                .min_uV = mVolts * 1000, \
                .enable_time = turnon_delay, \
                .of_map_mode = NULL, \
                }, \
        }

#define TWL6032_ADJUSTABLE_SMPS(label, offset) \
static const struct twlreg_info TWLSMPS_INFO_##label = { \
        .base = offset, \
        .min_mV = 600, \
        .desc = { \
                .name = #label, \
                .id = TWL6032_REG_##label, \
                .n_voltages = 63, \
                .ops = &twlsmps_ops, \
                .type = REGULATOR_VOLTAGE, \
                .owner = THIS_MODULE, \
                }, \
        }

/* 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_SMPS(VDD1);
TWL6030_ADJUSTABLE_SMPS(VDD2);
TWL6030_ADJUSTABLE_SMPS(VDD3);
TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1000);
TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 1000);
TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 1000);
TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 1000);
TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 1000);
TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 1000);
/* 6025 are renamed compared to 6030 versions */
TWL6032_ADJUSTABLE_LDO(LDO2, 0x54, 1000);
TWL6032_ADJUSTABLE_LDO(LDO4, 0x58, 1000);
TWL6032_ADJUSTABLE_LDO(LDO3, 0x5c, 1000);
TWL6032_ADJUSTABLE_LDO(LDO5, 0x68, 1000);
TWL6032_ADJUSTABLE_LDO(LDO1, 0x6c, 1000);
TWL6032_ADJUSTABLE_LDO(LDO7, 0x74, 1000);
TWL6032_ADJUSTABLE_LDO(LDO6, 0x60, 1000);
TWL6032_ADJUSTABLE_LDO(LDOLN, 0x64, 1000);
TWL6032_ADJUSTABLE_LDO(LDOUSB, 0x70, 1000);
TWL6030_FIXED_LDO(VANA, 0x50, 2100, 0);
TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 0);
TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 0);
TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 0);
TWL6030_FIXED_LDO(V1V8, 0x16, 1800, 0);
TWL6030_FIXED_LDO(V2V1, 0x1c, 2100, 0);
TWL6032_ADJUSTABLE_SMPS(SMPS3, 0x34);
TWL6032_ADJUSTABLE_SMPS(SMPS4, 0x10);
TWL6032_ADJUSTABLE_SMPS(VIO, 0x16);

static u8 twl_get_smps_offset(void)
{
        u8 value;

        twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &value,
                        TWL6030_SMPS_OFFSET);
        return value;
}

static u8 twl_get_smps_mult(void)
{
        u8 value;

        twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &value,
                        TWL6030_SMPS_MULT);
        return value;
}

#define TWL_OF_MATCH(comp, family, label) \
        { \
                .compatible = comp, \
                .data = &family##_INFO_##label, \
        }

#define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
#define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
#define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
#define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)

static const struct of_device_id twl_of_match[] = {
        TWL6030_OF_MATCH("ti,twl6030-vdd1", VDD1),
        TWL6030_OF_MATCH("ti,twl6030-vdd2", VDD2),
        TWL6030_OF_MATCH("ti,twl6030-vdd3", VDD3),
        TWL6030_OF_MATCH("ti,twl6030-vaux1", VAUX1_6030),
        TWL6030_OF_MATCH("ti,twl6030-vaux2", VAUX2_6030),
        TWL6030_OF_MATCH("ti,twl6030-vaux3", VAUX3_6030),
        TWL6030_OF_MATCH("ti,twl6030-vmmc", VMMC),
        TWL6030_OF_MATCH("ti,twl6030-vpp", VPP),
        TWL6030_OF_MATCH("ti,twl6030-vusim", VUSIM),
        TWL6032_OF_MATCH("ti,twl6032-ldo2", LDO2),
        TWL6032_OF_MATCH("ti,twl6032-ldo4", LDO4),
        TWL6032_OF_MATCH("ti,twl6032-ldo3", LDO3),
        TWL6032_OF_MATCH("ti,twl6032-ldo5", LDO5),
        TWL6032_OF_MATCH("ti,twl6032-ldo1", LDO1),
        TWL6032_OF_MATCH("ti,twl6032-ldo7", LDO7),
        TWL6032_OF_MATCH("ti,twl6032-ldo6", LDO6),
        TWL6032_OF_MATCH("ti,twl6032-ldoln", LDOLN),
        TWL6032_OF_MATCH("ti,twl6032-ldousb", LDOUSB),
        TWLFIXED_OF_MATCH("ti,twl6030-vana", VANA),
        TWLFIXED_OF_MATCH("ti,twl6030-vcxio", VCXIO),
        TWLFIXED_OF_MATCH("ti,twl6030-vdac", VDAC),
        TWLFIXED_OF_MATCH("ti,twl6030-vusb", VUSB),
        TWLFIXED_OF_MATCH("ti,twl6030-v1v8", V1V8),
        TWLFIXED_OF_MATCH("ti,twl6030-v2v1", V2V1),
        TWLSMPS_OF_MATCH("ti,twl6032-smps3", SMPS3),
        TWLSMPS_OF_MATCH("ti,twl6032-smps4", SMPS4),
        TWLSMPS_OF_MATCH("ti,twl6032-vio", VIO),
        {},
};
MODULE_DEVICE_TABLE(of, twl_of_match);

static int twlreg_probe(struct platform_device *pdev)
{
        int id;
        struct twlreg_info              *info;
        const struct twlreg_info        *template;
        struct regulator_init_data      *initdata;
        struct regulation_constraints   *c;
        struct regulator_dev            *rdev;
        const struct of_device_id       *match;
        struct regulator_config         config = { };

        match = of_match_device(twl_of_match, &pdev->dev);
        if (!match)
                return -ENODEV;

        template = match->data;
        if (!template)
                return -ENODEV;

        id = template->desc.id;
        initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
                                                &template->desc);
        if (!initdata)
                return -EINVAL;

        info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;

        /* 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 (id) {
        case TWL6032_REG_SMPS3:
                if (twl_get_smps_mult() & SMPS_MULTOFFSET_SMPS3)
                        info->flags |= SMPS_EXTENDED_EN;
                if (twl_get_smps_offset() & SMPS_MULTOFFSET_SMPS3)
                        info->flags |= SMPS_OFFSET_EN;
                break;
        case TWL6032_REG_SMPS4:
                if (twl_get_smps_mult() & SMPS_MULTOFFSET_SMPS4)
                        info->flags |= SMPS_EXTENDED_EN;
                if (twl_get_smps_offset() & SMPS_MULTOFFSET_SMPS4)
                        info->flags |= SMPS_OFFSET_EN;
                break;
        case TWL6032_REG_VIO:
                if (twl_get_smps_mult() & SMPS_MULTOFFSET_VIO)
                        info->flags |= SMPS_EXTENDED_EN;
                if (twl_get_smps_offset() & SMPS_MULTOFFSET_VIO)
                        info->flags |= SMPS_OFFSET_EN;
                break;
        }

        config.dev = &pdev->dev;
        config.init_data = initdata;
        config.driver_data = info;
        config.of_node = pdev->dev.of_node;

        rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
        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);

        /* 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;
}

MODULE_ALIAS("platform:twl6030_reg");

static struct platform_driver twlreg_driver = {
        .probe          = twlreg_probe,
        /* NOTE: short name, to work around driver model truncation of
         * "twl_regulator.12" (and friends) to "twl_regulator.1".
         */
        .driver  = {
                .name  = "twl6030_reg",
                .of_match_table = of_match_ptr(twl_of_match),
        },
};

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("TWL6030 regulator driver");
MODULE_LICENSE("GPL");