/*
   * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
   * 1-Cell Li-Ion Charger connected via GPIOs.
   *
   * Copyright (c) 2008 Philipp Zabel
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   */
  
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/platform_device.h>
  #include <linux/err.h>

  #include <linux/module.h>

  #include <linux/gpio.h>
  #include <linux/regulator/bq24022.h>
  #include <linux/regulator/driver.h>

  static int bq24022_set_current_limit(struct regulator_dev *rdev,
  					int min_uA, int max_uA)
  {

  	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

  	dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA
  ",

  		max_uA >= 500000 ? "500" : "100");
  
  	/* REVISIT: maybe return error if min_uA != 0 ? */
  	gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
  	return 0;
  }
  
  static int bq24022_get_current_limit(struct regulator_dev *rdev)
  {

  	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

  
  	return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
  }
  
  static int bq24022_enable(struct regulator_dev *rdev)
  {

  	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

  	dev_dbg(rdev_get_dev(rdev), "enabling charger
  ");

  
  	gpio_set_value(pdata->gpio_nce, 0);
  	return 0;
  }
  
  static int bq24022_disable(struct regulator_dev *rdev)
  {

  	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

  	dev_dbg(rdev_get_dev(rdev), "disabling charger
  ");

  
  	gpio_set_value(pdata->gpio_nce, 1);
  	return 0;
  }
  
  static int bq24022_is_enabled(struct regulator_dev *rdev)
  {

  	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

  
  	return !gpio_get_value(pdata->gpio_nce);
  }
  
  static struct regulator_ops bq24022_ops = {
  	.set_current_limit = bq24022_set_current_limit,
  	.get_current_limit = bq24022_get_current_limit,
  	.enable            = bq24022_enable,
  	.disable           = bq24022_disable,
  	.is_enabled        = bq24022_is_enabled,
  };
  
  static struct regulator_desc bq24022_desc = {
  	.name  = "bq24022",
  	.ops   = &bq24022_ops,
  	.type  = REGULATOR_CURRENT,

  	.owner = THIS_MODULE,

  };
  
  static int __init bq24022_probe(struct platform_device *pdev)
  {
  	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
  	struct regulator_dev *bq24022;
  	int ret;
  
  	if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)
  		return -EINVAL;
  
  	ret = gpio_request(pdata->gpio_nce, "ncharge_en");
  	if (ret) {
  		dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d
  ",
  			pdata->gpio_nce);
  		goto err_ce;
  	}
  	ret = gpio_request(pdata->gpio_iset2, "charge_mode");
  	if (ret) {
  		dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d
  ",
  			pdata->gpio_iset2);
  		goto err_iset2;
  	}
  	ret = gpio_direction_output(pdata->gpio_iset2, 0);
  	ret = gpio_direction_output(pdata->gpio_nce, 1);

  	bq24022 = regulator_register(&bq24022_desc, &pdev->dev,

  				     pdata->init_data, pdata, NULL);

  	if (IS_ERR(bq24022)) {
  		dev_dbg(&pdev->dev, "couldn't register regulator
  ");
  		ret = PTR_ERR(bq24022);
  		goto err_reg;
  	}
  	platform_set_drvdata(pdev, bq24022);
  	dev_dbg(&pdev->dev, "registered regulator
  ");
  
  	return 0;
  err_reg:
  	gpio_free(pdata->gpio_iset2);
  err_iset2:
  	gpio_free(pdata->gpio_nce);
  err_ce:
  	return ret;
  }
  
  static int __devexit bq24022_remove(struct platform_device *pdev)
  {
  	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
  	struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
  
  	regulator_unregister(bq24022);
  	gpio_free(pdata->gpio_iset2);
  	gpio_free(pdata->gpio_nce);
  
  	return 0;
  }
  
  static struct platform_driver bq24022_driver = {
  	.driver = {
  		.name = "bq24022",
  	},
  	.remove = __devexit_p(bq24022_remove),
  };
  
  static int __init bq24022_init(void)
  {
  	return platform_driver_probe(&bq24022_driver, bq24022_probe);
  }
  
  static void __exit bq24022_exit(void)
  {
  	platform_driver_unregister(&bq24022_driver);
  }

  module_init(bq24022_init);

  module_exit(bq24022_exit);
  
  MODULE_AUTHOR("Philipp Zabel");
  MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
  MODULE_LICENSE("GPL");