/*
   * Device driver for Hi6421 IC
   *
   * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
   *              http://www.hisilicon.com
   * Copyright (c) <2013-2014> Linaro Ltd.
   *              http://www.linaro.org
   *
   * Author: Guodong Xu <guodong.xu@linaro.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.
   *
   * This program is distributed in the hope it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/device.h>
  #include <linux/err.h>
  #include <linux/mfd/core.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/regmap.h>
  #include <linux/mfd/hi6421-pmic.h>
  
  static const struct mfd_cell hi6421_devs[] = {
  	{ .name = "hi6421-regulator", },
  };

  static const struct regmap_config hi6421_regmap_config = {

  	.reg_bits = 32,
  	.reg_stride = 4,
  	.val_bits = 8,
  	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
  };
  
  static int hi6421_pmic_probe(struct platform_device *pdev)
  {
  	struct hi6421_pmic *pmic;
  	struct resource *res;
  	void __iomem *base;
  	int ret;
  
  	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
  	if (!pmic)
  		return -ENOMEM;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	base = devm_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(base))
  		return PTR_ERR(base);
  
  	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
  						 &hi6421_regmap_config);
  	if (IS_ERR(pmic->regmap)) {
  		dev_err(&pdev->dev,
  			"regmap init failed: %ld
  ", PTR_ERR(pmic->regmap));
  		return PTR_ERR(pmic->regmap);
  	}
  
  	/* set over-current protection debounce 8ms */
  	regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
  				(HI6421_OCP_DEB_SEL_MASK
  				 | HI6421_OCP_EN_DEBOUNCE_MASK
  				 | HI6421_OCP_AUTO_STOP_MASK),
  				(HI6421_OCP_DEB_SEL_8MS
  				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
  
  	platform_set_drvdata(pdev, pmic);

  	ret = devm_mfd_add_devices(&pdev->dev, 0, hi6421_devs,
  				   ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);

  	if (ret) {
  		dev_err(&pdev->dev, "add mfd devices failed: %d
  ", ret);
  		return ret;
  	}
  
  	return 0;
  }

  static const struct of_device_id of_hi6421_pmic_match_tbl[] = {

  	{ .compatible = "hisilicon,hi6421-pmic", },
  	{ },
  };

  MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match_tbl);

  
  static struct platform_driver hi6421_pmic_driver = {
  	.driver = {
  		.name	= "hi6421_pmic",
  		.of_match_table = of_hi6421_pmic_match_tbl,
  	},
  	.probe	= hi6421_pmic_probe,

  };
  module_platform_driver(hi6421_pmic_driver);
  
  MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
  MODULE_DESCRIPTION("Hi6421 PMIC driver");
  MODULE_LICENSE("GPL v2");