text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Driver for TPS61050/61052 boost converters, typically used for white LEDs
   * or audio amplifiers.
   *
   * Copyright (C) 2011 ST-Ericsson SA
   * Written on behalf of Linaro for ST-Ericsson
   *
   * Author: Linus Walleij <linus.walleij@linaro.org>
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/err.h>
  #include <linux/regmap.h>
  #include <linux/platform_device.h>
  #include <linux/regulator/driver.h>
  #include <linux/mfd/core.h>
  #include <linux/mfd/tps6105x.h>
  
  static const unsigned int tps6105x_voltages[] = {
  	4500000,
  	5000000,
  	5250000,
  	5000000, /* There is an additional 5V */
  };
  
  static struct regulator_ops tps6105x_regulator_ops = {
  	.enable		= regulator_enable_regmap,
  	.disable	= regulator_disable_regmap,
  	.is_enabled	= regulator_is_enabled_regmap,
  	.get_voltage_sel = regulator_get_voltage_sel_regmap,
  	.set_voltage_sel = regulator_set_voltage_sel_regmap,
  	.list_voltage	= regulator_list_voltage_table,
  };
  
  static const struct regulator_desc tps6105x_regulator_desc = {
  	.name		= "tps6105x-boost",
  	.ops		= &tps6105x_regulator_ops,
  	.type		= REGULATOR_VOLTAGE,
  	.id		= 0,
  	.owner		= THIS_MODULE,
  	.n_voltages	= ARRAY_SIZE(tps6105x_voltages),
  	.volt_table	= tps6105x_voltages,
  	.vsel_reg	= TPS6105X_REG_0,
  	.vsel_mask	= TPS6105X_REG0_VOLTAGE_MASK,
  	.enable_reg	= TPS6105X_REG_0,
  	.enable_mask	= TPS6105X_REG0_MODE_MASK,
  	.enable_val	= TPS6105X_REG0_MODE_VOLTAGE <<
  			  TPS6105X_REG0_MODE_SHIFT,
  };
  
  /*
   * Registers the chip as a voltage regulator
   */
  static int tps6105x_regulator_probe(struct platform_device *pdev)
  {
  	struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
  	struct tps6105x_platform_data *pdata = tps6105x->pdata;
  	struct regulator_config config = { };
  	int ret;
  
  	/* This instance is not set for regulator mode so bail out */
  	if (pdata->mode != TPS6105X_MODE_VOLTAGE) {
  		dev_info(&pdev->dev,
  			"chip not in voltage mode mode, exit probe\n");
  		return 0;
  	}
  
  	config.dev = &tps6105x->client->dev;
  	config.init_data = pdata->regulator_data;
  	config.driver_data = tps6105x;
  	config.regmap = tps6105x->regmap;
  
  	/* Register regulator with framework */
  	tps6105x->regulator = devm_regulator_register(&pdev->dev,
  						      &tps6105x_regulator_desc,
  						      &config);
  	if (IS_ERR(tps6105x->regulator)) {
  		ret = PTR_ERR(tps6105x->regulator);
  		dev_err(&tps6105x->client->dev,
  			"failed to register regulator\n");
  		return ret;
  	}
  	platform_set_drvdata(pdev, tps6105x);
  
  	return 0;
  }
  
  static struct platform_driver tps6105x_regulator_driver = {
  	.driver = {
  		.name  = "tps6105x-regulator",
  	},
  	.probe = tps6105x_regulator_probe,
  };
  
  static __init int tps6105x_regulator_init(void)
  {
  	return platform_driver_register(&tps6105x_regulator_driver);
  }
  subsys_initcall(tps6105x_regulator_init);
  
  static __exit void tps6105x_regulator_exit(void)
  {
  	platform_driver_unregister(&tps6105x_regulator_driver);
  }
  module_exit(tps6105x_regulator_exit);
  
  MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
  MODULE_DESCRIPTION("TPS6105x regulator driver");
  MODULE_LICENSE("GPL v2");
  MODULE_ALIAS("platform:tps6105x-regulator");
  