/*
   * MFD core driver for the Richtek RT5033.
   *
   * RT5033 comprises multiple sub-devices switcing charger, fuel gauge,
   * flash LED, current source, LDO and BUCK regulators.
   *
   * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
   * Author: Beomho Seo <beomho.seo@samsung.com>
   *
   * 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 bythe Free Software Foundation.
   */
  
  #include <linux/err.h>
  #include <linux/module.h>
  #include <linux/interrupt.h>
  #include <linux/of_device.h>
  #include <linux/mfd/core.h>
  #include <linux/mfd/rt5033.h>
  #include <linux/mfd/rt5033-private.h>
  
  static const struct regmap_irq rt5033_irqs[] = {
  	{ .mask = RT5033_PMIC_IRQ_BUCKOCP, },
  	{ .mask = RT5033_PMIC_IRQ_BUCKLV, },
  	{ .mask = RT5033_PMIC_IRQ_SAFELDOLV, },
  	{ .mask = RT5033_PMIC_IRQ_LDOLV, },
  	{ .mask = RT5033_PMIC_IRQ_OT, },
  	{ .mask = RT5033_PMIC_IRQ_VDDA_UV, },
  };
  
  static const struct regmap_irq_chip rt5033_irq_chip = {
  	.name		= "rt5033",
  	.status_base	= RT5033_REG_PMIC_IRQ_STAT,
  	.mask_base	= RT5033_REG_PMIC_IRQ_CTRL,
  	.mask_invert	= true,
  	.num_regs	= 1,
  	.irqs		= rt5033_irqs,
  	.num_irqs	= ARRAY_SIZE(rt5033_irqs),
  };
  
  static const struct mfd_cell rt5033_devs[] = {
  	{ .name = "rt5033-regulator", },
  	{
  		.name = "rt5033-charger",
  		.of_compatible = "richtek,rt5033-charger",
  	}, {
  		.name = "rt5033-battery",
  		.of_compatible = "richtek,rt5033-battery",

  	}, {
  		.name = "rt5033-led",
  		.of_compatible = "richtek,rt5033-led",

  	},
  };
  
  static const struct regmap_config rt5033_regmap_config = {
  	.reg_bits	= 8,
  	.val_bits	= 8,
  	.max_register	= RT5033_REG_END,
  };
  
  static int rt5033_i2c_probe(struct i2c_client *i2c,
  				const struct i2c_device_id *id)
  {
  	struct rt5033_dev *rt5033;
  	unsigned int dev_id;
  	int ret;
  
  	rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
  	if (!rt5033)
  		return -ENOMEM;
  
  	i2c_set_clientdata(i2c, rt5033);
  	rt5033->dev = &i2c->dev;
  	rt5033->irq = i2c->irq;
  	rt5033->wakeup = true;
  
  	rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
  	if (IS_ERR(rt5033->regmap)) {
  		dev_err(&i2c->dev, "Failed to allocate register map.
  ");
  		return PTR_ERR(rt5033->regmap);
  	}
  
  	ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
  	if (ret) {
  		dev_err(&i2c->dev, "Device not found
  ");
  		return -ENODEV;
  	}
  	dev_info(&i2c->dev, "Device found Device ID: %04x
  ", dev_id);
  
  	ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
  			IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  			0, &rt5033_irq_chip, &rt5033->irq_data);
  	if (ret) {
  		dev_err(&i2c->dev, "Failed to request IRQ %d: %d
  ",
  							rt5033->irq, ret);
  		return ret;
  	}

  	ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs,
  				   ARRAY_SIZE(rt5033_devs), NULL, 0,
  				   regmap_irq_get_domain(rt5033->irq_data));

  	if (ret < 0) {
  		dev_err(&i2c->dev, "Failed to add RT5033 child devices.
  ");
  		return ret;
  	}
  
  	device_init_wakeup(rt5033->dev, rt5033->wakeup);
  
  	return 0;
  }

  static const struct i2c_device_id rt5033_i2c_id[] = {
  	{ "rt5033", },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
  
  static const struct of_device_id rt5033_dt_match[] = {
  	{ .compatible = "richtek,rt5033", },
  	{ }
  };

  MODULE_DEVICE_TABLE(of, rt5033_dt_match);

  
  static struct i2c_driver rt5033_driver = {
  	.driver = {
  		.name = "rt5033",
  		.of_match_table = of_match_ptr(rt5033_dt_match),
  	},
  	.probe = rt5033_i2c_probe,

  	.id_table = rt5033_i2c_id,
  };
  module_i2c_driver(rt5033_driver);

  MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
  MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
  MODULE_LICENSE("GPL");