// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Copyright (C) ST-Ericsson SA 2010
   *

   * Authors: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
   *
   * This file is based on drivers/regulator/ab8500.c
   *
   * AB8500 external regulators
   *
   * ab8500-ext supports the following regulators:
   * - VextSupply3
   */
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/err.h>
  #include <linux/module.h>

  #include <linux/of.h>

  #include <linux/platform_device.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/machine.h>

  #include <linux/regulator/of_regulator.h>

  #include <linux/mfd/abx500.h>
  #include <linux/mfd/abx500/ab8500.h>
  #include <linux/regulator/ab8500.h>

  static struct regulator_consumer_supply ab8500_vaux1_consumers[] = {
  	/* Main display, u8500 R3 uib */
  	REGULATOR_SUPPLY("vddi", "mcde_disp_sony_acx424akp.0"),
  	/* Main display, u8500 uib and ST uib */
  	REGULATOR_SUPPLY("vdd1", "samsung_s6d16d0.0"),
  	/* Secondary display, ST uib */
  	REGULATOR_SUPPLY("vdd1", "samsung_s6d16d0.1"),
  	/* SFH7741 proximity sensor */
  	REGULATOR_SUPPLY("vcc", "gpio-keys.0"),
  	/* BH1780GLS ambient light sensor */
  	REGULATOR_SUPPLY("vcc", "2-0029"),
  	/* lsm303dlh accelerometer */
  	REGULATOR_SUPPLY("vdd", "2-0018"),
  	/* lsm303dlhc accelerometer */
  	REGULATOR_SUPPLY("vdd", "2-0019"),
  	/* lsm303dlh magnetometer */
  	REGULATOR_SUPPLY("vdd", "2-001e"),
  	/* Rohm BU21013 Touchscreen devices */
  	REGULATOR_SUPPLY("avdd", "3-005c"),
  	REGULATOR_SUPPLY("avdd", "3-005d"),
  	/* Synaptics RMI4 Touchscreen device */
  	REGULATOR_SUPPLY("vdd", "3-004b"),
  	/* L3G4200D Gyroscope device */
  	REGULATOR_SUPPLY("vdd", "2-0068"),
  	/* Ambient light sensor device */
  	REGULATOR_SUPPLY("vdd", "3-0029"),
  	/* Pressure sensor device */
  	REGULATOR_SUPPLY("vdd", "2-005c"),
  	/* Cypress TrueTouch Touchscreen device */
  	REGULATOR_SUPPLY("vcpin", "spi8.0"),
  	/* Camera device */
  	REGULATOR_SUPPLY("vaux12v5", "mmio_camera"),
  };
  
  static struct regulator_consumer_supply ab8500_vaux2_consumers[] = {
  	/* On-board eMMC power */
  	REGULATOR_SUPPLY("vmmc", "sdi4"),
  	/* AB8500 audio codec */
  	REGULATOR_SUPPLY("vcc-N2158", "ab8500-codec.0"),
  	/* AB8500 accessory detect 1 */
  	REGULATOR_SUPPLY("vcc-N2158", "ab8500-acc-det.0"),
  	/* AB8500 Tv-out device */
  	REGULATOR_SUPPLY("vcc-N2158", "mcde_tv_ab8500.4"),
  	/* AV8100 HDMI device */
  	REGULATOR_SUPPLY("vcc-N2158", "av8100_hdmi.3"),
  };
  
  static struct regulator_consumer_supply ab8500_vaux3_consumers[] = {
  	REGULATOR_SUPPLY("v-SD-STM", "stm"),
  	/* External MMC slot power */
  	REGULATOR_SUPPLY("vmmc", "sdi0"),
  };
  
  static struct regulator_consumer_supply ab8500_vtvout_consumers[] = {
  	/* TV-out DENC supply */
  	REGULATOR_SUPPLY("vtvout", "ab8500-denc.0"),
  	/* Internal general-purpose ADC */
  	REGULATOR_SUPPLY("vddadc", "ab8500-gpadc.0"),
  	/* ADC for charger */
  	REGULATOR_SUPPLY("vddadc", "ab8500-charger.0"),
  	/* AB8500 Tv-out device */
  	REGULATOR_SUPPLY("vtvout", "mcde_tv_ab8500.4"),
  };
  
  static struct regulator_consumer_supply ab8500_vaud_consumers[] = {
  	/* AB8500 audio-codec main supply */
  	REGULATOR_SUPPLY("vaud", "ab8500-codec.0"),
  };
  
  static struct regulator_consumer_supply ab8500_vamic1_consumers[] = {
  	/* AB8500 audio-codec Mic1 supply */
  	REGULATOR_SUPPLY("vamic1", "ab8500-codec.0"),
  };
  
  static struct regulator_consumer_supply ab8500_vamic2_consumers[] = {
  	/* AB8500 audio-codec Mic2 supply */
  	REGULATOR_SUPPLY("vamic2", "ab8500-codec.0"),
  };
  
  static struct regulator_consumer_supply ab8500_vdmic_consumers[] = {
  	/* AB8500 audio-codec DMic supply */
  	REGULATOR_SUPPLY("vdmic", "ab8500-codec.0"),
  };
  
  static struct regulator_consumer_supply ab8500_vintcore_consumers[] = {
  	/* SoC core supply, no device */
  	REGULATOR_SUPPLY("v-intcore", NULL),
  	/* USB Transceiver */
  	REGULATOR_SUPPLY("vddulpivio18", "ab8500-usb.0"),
  	/* Handled by abx500 clk driver */
  	REGULATOR_SUPPLY("v-intcore", "abx500-clk.0"),
  };
  
  static struct regulator_consumer_supply ab8500_vana_consumers[] = {
  	/* DB8500 DSI */
  	REGULATOR_SUPPLY("vdddsi1v2", "mcde"),
  	REGULATOR_SUPPLY("vdddsi1v2", "b2r2_core"),
  	REGULATOR_SUPPLY("vdddsi1v2", "b2r2_1_core"),
  	REGULATOR_SUPPLY("vdddsi1v2", "dsilink.0"),
  	REGULATOR_SUPPLY("vdddsi1v2", "dsilink.1"),
  	REGULATOR_SUPPLY("vdddsi1v2", "dsilink.2"),
  	/* DB8500 CSI */
  	REGULATOR_SUPPLY("vddcsi1v2", "mmio_camera"),
  };
  
  /* ab8500 regulator register initialization */
  static struct ab8500_regulator_reg_init ab8500_reg_init[] = {
  	/*
  	 * VanaRequestCtrl          = HP/LP depending on VxRequest
  	 * VextSupply1RequestCtrl   = HP/LP depending on VxRequest
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUREQUESTCTRL2,       0xf0, 0x00),
  	/*
  	 * VextSupply2RequestCtrl   = HP/LP depending on VxRequest
  	 * VextSupply3RequestCtrl   = HP/LP depending on VxRequest
  	 * Vaux1RequestCtrl         = HP/LP depending on VxRequest
  	 * Vaux2RequestCtrl         = HP/LP depending on VxRequest
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUREQUESTCTRL3,       0xff, 0x00),
  	/*
  	 * Vaux3RequestCtrl         = HP/LP depending on VxRequest
  	 * SwHPReq                  = Control through SWValid disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUREQUESTCTRL4,       0x07, 0x00),
  	/*
  	 * VanaSysClkReq1HPValid    = disabled
  	 * Vaux1SysClkReq1HPValid   = disabled
  	 * Vaux2SysClkReq1HPValid   = disabled
  	 * Vaux3SysClkReq1HPValid   = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUSYSCLKREQ1HPVALID1, 0xe8, 0x00),
  	/*
  	 * VextSupply1SysClkReq1HPValid = disabled
  	 * VextSupply2SysClkReq1HPValid = disabled
  	 * VextSupply3SysClkReq1HPValid = SysClkReq1 controlled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUSYSCLKREQ1HPVALID2, 0x70, 0x40),
  	/*
  	 * VanaHwHPReq1Valid        = disabled
  	 * Vaux1HwHPreq1Valid       = disabled
  	 * Vaux2HwHPReq1Valid       = disabled
  	 * Vaux3HwHPReqValid        = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUHWHPREQ1VALID1,     0xe8, 0x00),
  	/*
  	 * VextSupply1HwHPReq1Valid = disabled
  	 * VextSupply2HwHPReq1Valid = disabled
  	 * VextSupply3HwHPReq1Valid = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUHWHPREQ1VALID2,     0x07, 0x00),
  	/*
  	 * VanaHwHPReq2Valid        = disabled
  	 * Vaux1HwHPReq2Valid       = disabled
  	 * Vaux2HwHPReq2Valid       = disabled
  	 * Vaux3HwHPReq2Valid       = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUHWHPREQ2VALID1,     0xe8, 0x00),
  	/*
  	 * VextSupply1HwHPReq2Valid = disabled
  	 * VextSupply2HwHPReq2Valid = disabled
  	 * VextSupply3HwHPReq2Valid = HWReq2 controlled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUHWHPREQ2VALID2,     0x07, 0x04),
  	/*
  	 * VanaSwHPReqValid         = disabled
  	 * Vaux1SwHPReqValid        = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUSWHPREQVALID1,      0xa0, 0x00),
  	/*
  	 * Vaux2SwHPReqValid        = disabled
  	 * Vaux3SwHPReqValid        = disabled
  	 * VextSupply1SwHPReqValid  = disabled
  	 * VextSupply2SwHPReqValid  = disabled
  	 * VextSupply3SwHPReqValid  = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUSWHPREQVALID2,      0x1f, 0x00),
  	/*
  	 * SysClkReq2Valid1         = SysClkReq2 controlled
  	 * SysClkReq3Valid1         = disabled
  	 * SysClkReq4Valid1         = SysClkReq4 controlled
  	 * SysClkReq5Valid1         = disabled
  	 * SysClkReq6Valid1         = SysClkReq6 controlled
  	 * SysClkReq7Valid1         = disabled
  	 * SysClkReq8Valid1         = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUSYSCLKREQVALID1,    0xfe, 0x2a),
  	/*
  	 * SysClkReq2Valid2         = disabled
  	 * SysClkReq3Valid2         = disabled
  	 * SysClkReq4Valid2         = disabled
  	 * SysClkReq5Valid2         = disabled
  	 * SysClkReq6Valid2         = SysClkReq6 controlled
  	 * SysClkReq7Valid2         = disabled
  	 * SysClkReq8Valid2         = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUSYSCLKREQVALID2,    0xfe, 0x20),
  	/*
  	 * VTVoutEna                = disabled
  	 * Vintcore12Ena            = disabled
  	 * Vintcore12Sel            = 1.25 V
  	 * Vintcore12LP             = inactive (HP)
  	 * VTVoutLP                 = inactive (HP)
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUMISC1,              0xfe, 0x10),
  	/*
  	 * VaudioEna                = disabled
  	 * VdmicEna                 = disabled
  	 * Vamic1Ena                = disabled
  	 * Vamic2Ena                = disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VAUDIOSUPPLY,           0x1e, 0x00),
  	/*
  	 * Vamic1_dzout             = high-Z when Vamic1 is disabled
  	 * Vamic2_dzout             = high-Z when Vamic2 is disabled
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUCTRL1VAMIC,         0x03, 0x00),
  	/*
  	 * VPll                     = Hw controlled (NOTE! PRCMU bits)
  	 * VanaRegu                 = force off
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VPLLVANAREGU,           0x0f, 0x02),
  	/*
  	 * VrefDDREna               = disabled
  	 * VrefDDRSleepMode         = inactive (no pulldown)
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VREFDDR,                0x03, 0x00),
  	/*
  	 * VextSupply1Regu          = force LP
  	 * VextSupply2Regu          = force OFF
  	 * VextSupply3Regu          = force HP (-> STBB2=LP and TPS=LP)
  	 * ExtSupply2Bypass         = ExtSupply12LPn ball is 0 when Ena is 0
  	 * ExtSupply3Bypass         = ExtSupply3LPn ball is 0 when Ena is 0
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_EXTSUPPLYREGU,          0xff, 0x13),
  	/*
  	 * Vaux1Regu                = force HP
  	 * Vaux2Regu                = force off
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VAUX12REGU,             0x0f, 0x01),
  	/*
  	 * Vaux3Regu                = force off
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VRF1VAUX3REGU,          0x03, 0x00),
  	/*
  	 * Vaux1Sel                 = 2.8 V
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VAUX1SEL,               0x0f, 0x0C),
  	/*
  	 * Vaux2Sel                 = 2.9 V
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VAUX2SEL,               0x0f, 0x0d),
  	/*
  	 * Vaux3Sel                 = 2.91 V
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_VRF1VAUX3SEL,           0x07, 0x07),
  	/*
  	 * VextSupply12LP           = disabled (no LP)
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUCTRL2SPARE,         0x01, 0x00),
  	/*
  	 * Vaux1Disch               = short discharge time
  	 * Vaux2Disch               = short discharge time
  	 * Vaux3Disch               = short discharge time
  	 * Vintcore12Disch          = short discharge time
  	 * VTVoutDisch              = short discharge time
  	 * VaudioDisch              = short discharge time
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUCTRLDISCH,          0xfc, 0x00),
  	/*
  	 * VanaDisch                = short discharge time
  	 * VdmicPullDownEna         = pulldown disabled when Vdmic is disabled
  	 * VdmicDisch               = short discharge time
  	 */
  	INIT_REGULATOR_REGISTER(AB8500_REGUCTRLDISCH2,         0x16, 0x00),
  };
  
  /* AB8500 regulators */
  static struct regulator_init_data ab8500_regulators[AB8500_NUM_REGULATORS] = {
  	/* supplies to the display/camera */
  	[AB8500_LDO_AUX1] = {
  		.supply_regulator = "ab8500-ext-supply3",
  		.constraints = {
  			.name = "V-DISPLAY",
  			.min_uV = 2800000,
  			.max_uV = 3300000,
  			.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE |
  					  REGULATOR_CHANGE_STATUS,
  			.boot_on = 1, /* display is on at boot */
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vaux1_consumers),
  		.consumer_supplies = ab8500_vaux1_consumers,
  	},
  	/* supplies to the on-board eMMC */
  	[AB8500_LDO_AUX2] = {
  		.supply_regulator = "ab8500-ext-supply3",
  		.constraints = {
  			.name = "V-eMMC1",
  			.min_uV = 1100000,
  			.max_uV = 3300000,
  			.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE |
  					  REGULATOR_CHANGE_STATUS |
  					  REGULATOR_CHANGE_MODE,
  			.valid_modes_mask = REGULATOR_MODE_NORMAL |
  					    REGULATOR_MODE_IDLE,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vaux2_consumers),
  		.consumer_supplies = ab8500_vaux2_consumers,
  	},
  	/* supply for VAUX3, supplies to SDcard slots */
  	[AB8500_LDO_AUX3] = {
  		.supply_regulator = "ab8500-ext-supply3",
  		.constraints = {
  			.name = "V-MMC-SD",
  			.min_uV = 1100000,
  			.max_uV = 3300000,
  			.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE |
  					  REGULATOR_CHANGE_STATUS |
  					  REGULATOR_CHANGE_MODE,
  			.valid_modes_mask = REGULATOR_MODE_NORMAL |
  					    REGULATOR_MODE_IDLE,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vaux3_consumers),
  		.consumer_supplies = ab8500_vaux3_consumers,
  	},
  	/* supply for tvout, gpadc, TVOUT LDO */
  	[AB8500_LDO_TVOUT] = {
  		.constraints = {
  			.name = "V-TVOUT",
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vtvout_consumers),
  		.consumer_supplies = ab8500_vtvout_consumers,
  	},
  	/* supply for ab8500-vaudio, VAUDIO LDO */
  	[AB8500_LDO_AUDIO] = {
  		.constraints = {
  			.name = "V-AUD",
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vaud_consumers),
  		.consumer_supplies = ab8500_vaud_consumers,
  	},
  	/* supply for v-anamic1 VAMic1-LDO */
  	[AB8500_LDO_ANAMIC1] = {
  		.constraints = {
  			.name = "V-AMIC1",
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vamic1_consumers),
  		.consumer_supplies = ab8500_vamic1_consumers,
  	},
  	/* supply for v-amic2, VAMIC2 LDO, reuse constants for AMIC1 */
  	[AB8500_LDO_ANAMIC2] = {
  		.constraints = {
  			.name = "V-AMIC2",
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vamic2_consumers),
  		.consumer_supplies = ab8500_vamic2_consumers,
  	},
  	/* supply for v-dmic, VDMIC LDO */
  	[AB8500_LDO_DMIC] = {
  		.constraints = {
  			.name = "V-DMIC",
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vdmic_consumers),
  		.consumer_supplies = ab8500_vdmic_consumers,
  	},
  	/* supply for v-intcore12, VINTCORE12 LDO */
  	[AB8500_LDO_INTCORE] = {
  		.constraints = {
  			.name = "V-INTCORE",
  			.min_uV = 1250000,
  			.max_uV = 1350000,
  			.input_uV = 1800000,
  			.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE |
  					  REGULATOR_CHANGE_STATUS |
  					  REGULATOR_CHANGE_MODE |
  					  REGULATOR_CHANGE_DRMS,
  			.valid_modes_mask = REGULATOR_MODE_NORMAL |
  					    REGULATOR_MODE_IDLE,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vintcore_consumers),
  		.consumer_supplies = ab8500_vintcore_consumers,
  	},
  	/* supply for U8500 CSI-DSI, VANA LDO */
  	[AB8500_LDO_ANA] = {
  		.constraints = {
  			.name = "V-CSI-DSI",
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  		},
  		.num_consumer_supplies = ARRAY_SIZE(ab8500_vana_consumers),
  		.consumer_supplies = ab8500_vana_consumers,
  	},
  };
  
  /* supply for VextSupply3 */
  static struct regulator_consumer_supply ab8500_ext_supply3_consumers[] = {
  	/* SIM supply for 3 V SIM cards */
  	REGULATOR_SUPPLY("vinvsim", "sim-detect.0"),
  };
  
  /*
   * AB8500 external regulators
   */
  static struct regulator_init_data ab8500_ext_regulators[] = {
  	/* fixed Vbat supplies VSMPS1_EXT_1V8 */
  	[AB8500_EXT_SUPPLY1] = {
  		.constraints = {
  			.name = "ab8500-ext-supply1",
  			.min_uV = 1800000,
  			.max_uV = 1800000,
  			.initial_mode = REGULATOR_MODE_IDLE,
  			.boot_on = 1,
  			.always_on = 1,
  		},
  	},
  	/* fixed Vbat supplies VSMPS2_EXT_1V36 and VSMPS5_EXT_1V15 */
  	[AB8500_EXT_SUPPLY2] = {
  		.constraints = {
  			.name = "ab8500-ext-supply2",
  			.min_uV = 1360000,
  			.max_uV = 1360000,
  		},
  	},
  	/* fixed Vbat supplies VSMPS3_EXT_3V4 and VSMPS4_EXT_3V4 */
  	[AB8500_EXT_SUPPLY3] = {
  		.constraints = {
  			.name = "ab8500-ext-supply3",
  			.min_uV = 3400000,
  			.max_uV = 3400000,
  			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
  			.boot_on = 1,
  		},
  		.num_consumer_supplies =
  			ARRAY_SIZE(ab8500_ext_supply3_consumers),
  		.consumer_supplies = ab8500_ext_supply3_consumers,
  	},
  };
  
  static struct ab8500_regulator_platform_data ab8500_regulator_plat_data = {
  	.reg_init               = ab8500_reg_init,
  	.num_reg_init           = ARRAY_SIZE(ab8500_reg_init),
  	.regulator              = ab8500_regulators,
  	.num_regulator          = ARRAY_SIZE(ab8500_regulators),
  	.ext_regulator          = ab8500_ext_regulators,
  	.num_ext_regulator      = ARRAY_SIZE(ab8500_ext_regulators),
  };

  /**
   * struct ab8500_ext_regulator_info - ab8500 regulator information
   * @dev: device pointer
   * @desc: regulator description

   * @cfg: regulator configuration (extension of regulator FW configuration)

   * @update_bank: bank to control on/off
   * @update_reg: register to control on/off
   * @update_mask: mask to enable/disable and set mode of regulator
   * @update_val: bits holding the regulator current mode

   * @update_val_hp: bits to set EN pin active (LPn pin deactive)

   *                 normally this means high power mode

   * @update_val_lp: bits to set EN pin active and LPn pin active
   *                 normally this means low power mode
   * @update_val_hw: bits to set regulator pins in HW control
   *                 SysClkReq pins and logic will choose mode

   */
  struct ab8500_ext_regulator_info {
  	struct device *dev;
  	struct regulator_desc desc;

  	struct ab8500_ext_regulator_cfg *cfg;

  	u8 update_bank;
  	u8 update_reg;
  	u8 update_mask;
  	u8 update_val;

  	u8 update_val_hp;
  	u8 update_val_lp;
  	u8 update_val_hw;

  };

  static int ab8500_ext_regulator_enable(struct regulator_dev *rdev)

  {
  	int ret;

  	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
  	u8 regval;

  	if (info == NULL) {
  		dev_err(rdev_get_dev(rdev), "regulator info null pointer
  ");
  		return -EINVAL;
  	}

  
  	/*
  	 * To satisfy both HW high power request and SW request, the regulator
  	 * must be on in high power.
  	 */
  	if (info->cfg && info->cfg->hwreq)

  		regval = info->update_val_hp;
  	else
  		regval = info->update_val;

  
  	ret = abx500_mask_and_set_register_interruptible(info->dev,
  		info->update_bank, info->update_reg,

  		info->update_mask, regval);

  	if (ret < 0) {

  		dev_err(rdev_get_dev(rdev),

  			"couldn't set enable bits for regulator
  ");

  		return ret;
  	}

  	dev_dbg(rdev_get_dev(rdev),
  		"%s-enable (bank, reg, mask, value): 0x%02x, 0x%02x, 0x%02x, 0x%02x
  ",
  		info->desc.name, info->update_bank, info->update_reg,
  		info->update_mask, regval);
  
  	return 0;

  }

  static int ab8500_ext_regulator_disable(struct regulator_dev *rdev)

  {
  	int ret;
  	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);

  	u8 regval;

  
  	if (info == NULL) {
  		dev_err(rdev_get_dev(rdev), "regulator info null pointer
  ");
  		return -EINVAL;
  	}

  	/*
  	 * Set the regulator in HW request mode if configured
  	 */
  	if (info->cfg && info->cfg->hwreq)

  		regval = info->update_val_hw;
  	else
  		regval = 0;

  	ret = abx500_mask_and_set_register_interruptible(info->dev,
  		info->update_bank, info->update_reg,

  		info->update_mask, regval);

  	if (ret < 0) {

  		dev_err(rdev_get_dev(rdev),

  			"couldn't set disable bits for regulator
  ");

  		return ret;
  	}

  	dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):"
  		" 0x%02x, 0x%02x, 0x%02x, 0x%02x
  ",
  		info->desc.name, info->update_bank, info->update_reg,

  		info->update_mask, regval);

  	return 0;

  }
  
  static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev)
  {
  	int ret;
  	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
  	u8 regval;
  
  	if (info == NULL) {
  		dev_err(rdev_get_dev(rdev), "regulator info null pointer
  ");
  		return -EINVAL;
  	}
  
  	ret = abx500_get_register_interruptible(info->dev,
  		info->update_bank, info->update_reg, &regval);
  	if (ret < 0) {
  		dev_err(rdev_get_dev(rdev),
  			"couldn't read 0x%x register
  ", info->update_reg);
  		return ret;
  	}
  
  	dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):"
  		" 0x%02x, 0x%02x, 0x%02x, 0x%02x
  ",
  		info->desc.name, info->update_bank, info->update_reg,
  		info->update_mask, regval);

  	if (((regval & info->update_mask) == info->update_val_lp) ||
  	    ((regval & info->update_mask) == info->update_val_hp))

  		return 1;

  	else

  		return 0;

  }
  
  static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev,
  					 unsigned int mode)
  {
  	int ret = 0;
  	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);

  	u8 regval;

  
  	if (info == NULL) {
  		dev_err(rdev_get_dev(rdev), "regulator info null pointer
  ");
  		return -EINVAL;
  	}
  
  	switch (mode) {
  	case REGULATOR_MODE_NORMAL:

  		regval = info->update_val_hp;

  		break;
  	case REGULATOR_MODE_IDLE:

  		regval = info->update_val_lp;

  		break;
  
  	default:
  		return -EINVAL;
  	}

  	/* If regulator is enabled and info->cfg->hwreq is set, the regulator
  	   must be on in high power, so we don't need to write the register with
  	   the same value.
  	 */
  	if (ab8500_ext_regulator_is_enabled(rdev) &&
  	    !(info->cfg && info->cfg->hwreq)) {
  		ret = abx500_mask_and_set_register_interruptible(info->dev,
  					info->update_bank, info->update_reg,
  					info->update_mask, regval);
  		if (ret < 0) {

  			dev_err(rdev_get_dev(rdev),
  				"Could not set regulator mode.
  ");

  			return ret;
  		}

  
  		dev_dbg(rdev_get_dev(rdev),
  			"%s-set_mode (bank, reg, mask, value): "
  			"0x%x, 0x%x, 0x%x, 0x%x
  ",
  			info->desc.name, info->update_bank, info->update_reg,
  			info->update_mask, regval);
  	}

  	info->update_val = regval;
  
  	return 0;

  }
  
  static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev)
  {
  	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
  	int ret;
  
  	if (info == NULL) {
  		dev_err(rdev_get_dev(rdev), "regulator info null pointer
  ");
  		return -EINVAL;
  	}
  
  	if (info->update_val == info->update_val_hp)
  		ret = REGULATOR_MODE_NORMAL;
  	else if (info->update_val == info->update_val_lp)
  		ret = REGULATOR_MODE_IDLE;
  	else
  		ret = -EINVAL;
  
  	return ret;
  }

  static int ab8500_ext_set_voltage(struct regulator_dev *rdev, int min_uV,
  				  int max_uV, unsigned *selector)
  {
  	struct regulation_constraints *regu_constraints = rdev->constraints;
  
  	if (!regu_constraints) {
  		dev_err(rdev_get_dev(rdev), "No regulator constraints
  ");
  		return -EINVAL;
  	}
  
  	if (regu_constraints->min_uV == min_uV &&
  	    regu_constraints->max_uV == max_uV)
  		return 0;
  
  	dev_err(rdev_get_dev(rdev),
  		"Requested min %duV max %duV != constrained min %duV max %duV
  ",
  		min_uV, max_uV,
  		regu_constraints->min_uV, regu_constraints->max_uV);
  
  	return -EINVAL;
  }

  static int ab8500_ext_list_voltage(struct regulator_dev *rdev,
  				   unsigned selector)
  {
  	struct regulation_constraints *regu_constraints = rdev->constraints;
  
  	if (regu_constraints == NULL) {
  		dev_err(rdev_get_dev(rdev), "regulator constraints null pointer
  ");
  		return -EINVAL;
  	}
  	/* return the uV for the fixed regulators */
  	if (regu_constraints->min_uV && regu_constraints->max_uV) {
  		if (regu_constraints->min_uV == regu_constraints->max_uV)
  			return regu_constraints->min_uV;
  	}
  	return -EINVAL;
  }

  static const struct regulator_ops ab8500_ext_regulator_ops = {

  	.enable			= ab8500_ext_regulator_enable,
  	.disable		= ab8500_ext_regulator_disable,
  	.is_enabled		= ab8500_ext_regulator_is_enabled,
  	.set_mode		= ab8500_ext_regulator_set_mode,
  	.get_mode		= ab8500_ext_regulator_get_mode,

  	.set_voltage		= ab8500_ext_set_voltage,

  	.list_voltage		= ab8500_ext_list_voltage,
  };

  static struct ab8500_ext_regulator_info
  		ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = {
  	[AB8500_EXT_SUPPLY1] = {
  		.desc = {
  			.name		= "VEXTSUPPLY1",

  			.of_match	= of_match_ptr("ab8500_ext1"),

  			.ops		= &ab8500_ext_regulator_ops,
  			.type		= REGULATOR_VOLTAGE,
  			.id		= AB8500_EXT_SUPPLY1,
  			.owner		= THIS_MODULE,
  			.n_voltages	= 1,
  		},
  		.update_bank		= 0x04,
  		.update_reg		= 0x08,
  		.update_mask		= 0x03,
  		.update_val		= 0x01,
  		.update_val_hp		= 0x01,
  		.update_val_lp		= 0x03,
  		.update_val_hw		= 0x02,
  	},
  	[AB8500_EXT_SUPPLY2] = {
  		.desc = {
  			.name		= "VEXTSUPPLY2",

  			.of_match	= of_match_ptr("ab8500_ext2"),

  			.ops		= &ab8500_ext_regulator_ops,
  			.type		= REGULATOR_VOLTAGE,
  			.id		= AB8500_EXT_SUPPLY2,
  			.owner		= THIS_MODULE,
  			.n_voltages	= 1,
  		},
  		.update_bank		= 0x04,
  		.update_reg		= 0x08,
  		.update_mask		= 0x0c,
  		.update_val		= 0x04,
  		.update_val_hp		= 0x04,
  		.update_val_lp		= 0x0c,
  		.update_val_hw		= 0x08,
  	},
  	[AB8500_EXT_SUPPLY3] = {
  		.desc = {
  			.name		= "VEXTSUPPLY3",

  			.of_match	= of_match_ptr("ab8500_ext3"),

  			.ops		= &ab8500_ext_regulator_ops,
  			.type		= REGULATOR_VOLTAGE,
  			.id		= AB8500_EXT_SUPPLY3,
  			.owner		= THIS_MODULE,
  			.n_voltages	= 1,
  		},
  		.update_bank		= 0x04,
  		.update_reg		= 0x08,
  		.update_mask		= 0x30,
  		.update_val		= 0x10,

  		.update_val_hp		= 0x10,
  		.update_val_lp		= 0x30,
  		.update_val_hw		= 0x20,

  	},
  };

  static int ab8500_ext_regulator_probe(struct platform_device *pdev)

  {
  	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);

  	struct ab8500_regulator_platform_data *pdata = &ab8500_regulator_plat_data;

  	struct regulator_config config = { };

  	struct regulator_dev *rdev;

  	int i;

  	if (!ab8500) {
  		dev_err(&pdev->dev, "null mfd parent
  ");
  		return -EINVAL;
  	}

  	/* make sure the platform data has the correct size */
  	if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) {
  		dev_err(&pdev->dev, "Configuration error: size mismatch.
  ");
  		return -EINVAL;
  	}
  
  	/* check for AB8500 2.x */

  	if (is_ab8500_2p0_or_earlier(ab8500)) {

  		struct ab8500_ext_regulator_info *info;
  
  		/* VextSupply3LPn is inverted on AB8500 2.x */
  		info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3];
  		info->update_val = 0x30;

  		info->update_val_hp = 0x30;
  		info->update_val_lp = 0x10;

  	}
  
  	/* register all regulators */
  	for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) {
  		struct ab8500_ext_regulator_info *info = NULL;
  
  		/* assign per-regulator data */
  		info = &ab8500_ext_regulator_info[i];
  		info->dev = &pdev->dev;

  		info->cfg = (struct ab8500_ext_regulator_cfg *)
  			pdata->ext_regulator[i].driver_data;

  
  		config.dev = &pdev->dev;

  		config.driver_data = info;

  		config.init_data = &pdata->ext_regulator[i];

  
  		/* register regulator with framework */

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

  			dev_err(&pdev->dev, "failed to register regulator %s
  ",
  					info->desc.name);

  			return PTR_ERR(rdev);

  		}

  		dev_dbg(&pdev->dev, "%s-probed
  ", info->desc.name);

  	}
  
  	return 0;
  }

  static struct platform_driver ab8500_ext_regulator_driver = {
  	.probe = ab8500_ext_regulator_probe,

  	.driver         = {
  		.name   = "ab8500-ext-regulator",

  	},
  };
  
  static int __init ab8500_ext_regulator_init(void)
  {
  	int ret;
  
  	ret = platform_driver_register(&ab8500_ext_regulator_driver);
  	if (ret)
  		pr_err("Failed to register ab8500 ext regulator: %d
  ", ret);
  
  	return ret;
  }
  subsys_initcall(ab8500_ext_regulator_init);
  
  static void __exit ab8500_ext_regulator_exit(void)
  {
  	platform_driver_unregister(&ab8500_ext_regulator_driver);

  }

  module_exit(ab8500_ext_regulator_exit);

  
  MODULE_LICENSE("GPL v2");
  MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>");
  MODULE_DESCRIPTION("AB8500 external regulator driver");
  MODULE_ALIAS("platform:ab8500-ext-regulator");