/*
   * isl9305 - Intersil ISL9305 DCDC regulator
   *
   * Copyright 2014 Linaro Ltd
   *
   * Author: Mark Brown <broonie@kernel.org>
   *
   *  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/err.h>
  #include <linux/i2c.h>
  #include <linux/of.h>
  #include <linux/platform_data/isl9305.h>
  #include <linux/regmap.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/of_regulator.h>
  #include <linux/slab.h>
  
  /*
   * Registers
   */
  #define ISL9305_DCD1OUT          0x0
  #define ISL9305_DCD2OUT          0x1
  #define ISL9305_LDO1OUT          0x2
  #define ISL9305_LDO2OUT          0x3
  #define ISL9305_DCD_PARAMETER    0x4
  #define ISL9305_SYSTEM_PARAMETER 0x5
  #define ISL9305_DCD_SRCTL        0x6
  
  #define ISL9305_MAX_REG ISL9305_DCD_SRCTL
  
  /*
   * DCD_PARAMETER
   */
  #define ISL9305_DCD_PHASE   0x40
  #define ISL9305_DCD2_ULTRA  0x20
  #define ISL9305_DCD1_ULTRA  0x10
  #define ISL9305_DCD2_BLD    0x08
  #define ISL9305_DCD1_BLD    0x04
  #define ISL9305_DCD2_MODE   0x02
  #define ISL9305_DCD1_MODE   0x01
  
  /*
   * SYSTEM_PARAMETER
   */
  #define ISL9305_I2C_EN      0x40
  #define ISL9305_DCDPOR_MASK 0x30
  #define ISL9305_LDO2_EN     0x08
  #define ISL9305_LDO1_EN     0x04
  #define ISL9305_DCD2_EN     0x02
  #define ISL9305_DCD1_EN     0x01
  
  /*
   * DCD_SRCTL
   */
  #define ISL9305_DCD2SR_MASK 0xc0
  #define ISL9305_DCD1SR_MASK 0x07
  
  static const struct regulator_ops isl9305_ops = {
  	.enable = regulator_enable_regmap,
  	.disable = regulator_disable_regmap,
  	.is_enabled = regulator_is_enabled_regmap,
  	.list_voltage = regulator_list_voltage_linear,
  	.get_voltage_sel = regulator_get_voltage_sel_regmap,
  	.set_voltage_sel = regulator_set_voltage_sel_regmap,
  };
  
  static const struct regulator_desc isl9305_regulators[] = {
  	[ISL9305_DCD1] = {
  		.name =		"DCD1",

  		.of_match =	of_match_ptr("dcd1"),
  		.regulators_node = of_match_ptr("regulators"),

  		.n_voltages =	0x70,
  		.min_uV =	825000,
  		.uV_step =	25000,
  		.vsel_reg =	ISL9305_DCD1OUT,
  		.vsel_mask =	0x7f,
  		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
  		.enable_mask =	ISL9305_DCD1_EN,
  		.supply_name =	"VINDCD1",
  		.ops =		&isl9305_ops,
  	},
  	[ISL9305_DCD2] = {
  		.name =		"DCD2",

  		.of_match =	of_match_ptr("dcd2"),
  		.regulators_node = of_match_ptr("regulators"),

  		.n_voltages =	0x70,
  		.min_uV =	825000,
  		.uV_step =	25000,
  		.vsel_reg =	ISL9305_DCD2OUT,
  		.vsel_mask =	0x7f,
  		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
  		.enable_mask =	ISL9305_DCD2_EN,
  		.supply_name =	"VINDCD2",
  		.ops =		&isl9305_ops,
  	},
  	[ISL9305_LDO1] = {
  		.name =		"LDO1",

  		.of_match =	of_match_ptr("ldo1"),
  		.regulators_node = of_match_ptr("regulators"),

  		.n_voltages =	0x37,
  		.min_uV =	900000,
  		.uV_step =	50000,
  		.vsel_reg =	ISL9305_LDO1OUT,
  		.vsel_mask =	0x3f,
  		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
  		.enable_mask =	ISL9305_LDO1_EN,
  		.supply_name =	"VINLDO1",
  		.ops =		&isl9305_ops,
  	},
  	[ISL9305_LDO2] = {
  		.name =		"LDO2",

  		.of_match =	of_match_ptr("ldo2"),
  		.regulators_node = of_match_ptr("regulators"),

  		.n_voltages =	0x37,
  		.min_uV =	900000,
  		.uV_step =	50000,
  		.vsel_reg =	ISL9305_LDO2OUT,
  		.vsel_mask =	0x3f,
  		.enable_reg =	ISL9305_SYSTEM_PARAMETER,
  		.enable_mask =	ISL9305_LDO2_EN,
  		.supply_name =	"VINLDO2",
  		.ops =		&isl9305_ops,
  	},
  };

  static const struct regmap_config isl9305_regmap = {
  	.reg_bits = 8,
  	.val_bits = 8,
  
  	.max_register = ISL9305_MAX_REG,
  	.cache_type = REGCACHE_RBTREE,
  };
  
  static int isl9305_i2c_probe(struct i2c_client *i2c,
  			     const struct i2c_device_id *id)
  {
  	struct regulator_config config = { };
  	struct isl9305_pdata *pdata = i2c->dev.platform_data;

  	struct regulator_dev *rdev;
  	struct regmap *regmap;
  	int i, ret;

  	regmap = devm_regmap_init_i2c(i2c, &isl9305_regmap);
  	if (IS_ERR(regmap)) {
  		ret = PTR_ERR(regmap);
  		dev_err(&i2c->dev, "Failed to create regmap: %d
  ", ret);
  		return ret;
  	}
  
  	config.dev = &i2c->dev;
  
  	for (i = 0; i < ARRAY_SIZE(isl9305_regulators); i++) {

  		if (pdata)

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

  		else
  			config.init_data = NULL;

  
  		rdev = devm_regulator_register(&i2c->dev,
  					       &isl9305_regulators[i],
  					       &config);
  		if (IS_ERR(rdev)) {
  			ret = PTR_ERR(rdev);
  			dev_err(&i2c->dev, "Failed to register %s: %d
  ",
  				isl9305_regulators[i].name, ret);
  			return ret;
  		}
  	}
  
  	return 0;
  }
  
  #ifdef CONFIG_OF
  static const struct of_device_id isl9305_dt_ids[] = {

  	{ .compatible = "isl,isl9305" }, /* for backward compat., don't use */
  	{ .compatible = "isil,isl9305" },
  	{ .compatible = "isl,isl9305h" }, /* for backward compat., don't use */
  	{ .compatible = "isil,isl9305h" },

  	{},
  };

  MODULE_DEVICE_TABLE(of, isl9305_dt_ids);

  #endif
  
  static const struct i2c_device_id isl9305_i2c_id[] = {
  	{ "isl9305", },
  	{ "isl9305h", },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, isl9305_i2c_id);
  
  static struct i2c_driver isl9305_regulator_driver = {
  	.driver = {
  		.name = "isl9305",

  		.of_match_table	= of_match_ptr(isl9305_dt_ids),
  	},
  	.probe = isl9305_i2c_probe,
  	.id_table = isl9305_i2c_id,
  };
  
  module_i2c_driver(isl9305_regulator_driver);
  
  MODULE_AUTHOR("Mark Brown");
  MODULE_DESCRIPTION("Intersil ISL9305 DCDC regulator");
  MODULE_LICENSE("GPL");