/*

   * max8998.c - mfd core driver for the Maxim 8998

   *
   *  Copyright (C) 2009-2010 Samsung Electronics
   *  Kyungmin Park <kyungmin.park@samsung.com>
   *  Marek Szyprowski <m.szyprowski@samsung.com>
   *
   * 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 that 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, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/i2c.h>

  #include <linux/interrupt.h>
  #include <linux/pm_runtime.h>

  #include <linux/mutex.h>
  #include <linux/mfd/core.h>
  #include <linux/mfd/max8998.h>
  #include <linux/mfd/max8998-private.h>

  #define RTC_I2C_ADDR		(0x0c >> 1)

  static struct mfd_cell max8998_devs[] = {
  	{
  		.name = "max8998-pmic",

  	}, {
  		.name = "max8998-rtc",

  	}, {
  		.name = "max8998-battery",

  	},

  };

  static struct mfd_cell lp3974_devs[] = {
  	{
  		.name = "lp3974-pmic",
  	}, {
  		.name = "lp3974-rtc",
  	},
  };

  int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)

  {

  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

  	int ret;
  
  	mutex_lock(&max8998->iolock);

  	ret = i2c_smbus_read_byte_data(i2c, reg);

  	mutex_unlock(&max8998->iolock);
  	if (ret < 0)
  		return ret;
  
  	ret &= 0xff;
  	*dest = ret;
  	return 0;
  }

  EXPORT_SYMBOL(max8998_read_reg);

  int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  {
  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  	int ret;
  
  	mutex_lock(&max8998->iolock);
  	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  	mutex_unlock(&max8998->iolock);
  	if (ret < 0)
  		return ret;
  
  	return 0;
  }
  EXPORT_SYMBOL(max8998_bulk_read);

  int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)

  {

  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

  	int ret;
  
  	mutex_lock(&max8998->iolock);

  	ret = i2c_smbus_write_byte_data(i2c, reg, value);

  	mutex_unlock(&max8998->iolock);
  	return ret;
  }

  EXPORT_SYMBOL(max8998_write_reg);

  int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  {
  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  	int ret;
  
  	mutex_lock(&max8998->iolock);
  	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
  	mutex_unlock(&max8998->iolock);
  	if (ret < 0)
  		return ret;
  
  	return 0;
  }
  EXPORT_SYMBOL(max8998_bulk_write);

  int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)

  {

  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

  	int ret;
  
  	mutex_lock(&max8998->iolock);

  	ret = i2c_smbus_read_byte_data(i2c, reg);

  	if (ret >= 0) {
  		u8 old_val = ret & 0xff;
  		u8 new_val = (val & mask) | (old_val & (~mask));

  		ret = i2c_smbus_write_byte_data(i2c, reg, new_val);

  	}
  	mutex_unlock(&max8998->iolock);
  	return ret;
  }

  EXPORT_SYMBOL(max8998_update_reg);

  
  static int max8998_i2c_probe(struct i2c_client *i2c,
  			    const struct i2c_device_id *id)
  {

  	struct max8998_platform_data *pdata = i2c->dev.platform_data;

  	struct max8998_dev *max8998;
  	int ret = 0;
  
  	max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);

  	if (max8998 == NULL)

  		return -ENOMEM;

  
  	i2c_set_clientdata(i2c, max8998);
  	max8998->dev = &i2c->dev;

  	max8998->i2c = i2c;

  	max8998->irq = i2c->irq;

  	max8998->type = id->driver_data;

  	if (pdata) {
  		max8998->ono = pdata->ono;
  		max8998->irq_base = pdata->irq_base;

  		max8998->wakeup = pdata->wakeup;

  	}

  	mutex_init(&max8998->iolock);

  	max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
  	i2c_set_clientdata(max8998->rtc, max8998);

  	max8998_irq_init(max8998);

  	pm_runtime_set_active(max8998->dev);

  	switch (id->driver_data) {
  	case TYPE_LP3974:
  		ret = mfd_add_devices(max8998->dev, -1,
  				lp3974_devs, ARRAY_SIZE(lp3974_devs),
  				NULL, 0);
  		break;
  	case TYPE_MAX8998:
  		ret = mfd_add_devices(max8998->dev, -1,
  				max8998_devs, ARRAY_SIZE(max8998_devs),
  				NULL, 0);
  		break;
  	default:
  		ret = -EINVAL;
  	}

  	if (ret < 0)
  		goto err;

  	device_init_wakeup(max8998->dev, max8998->wakeup);

  	return ret;
  
  err:
  	mfd_remove_devices(max8998->dev);

  	max8998_irq_exit(max8998);
  	i2c_unregister_device(max8998->rtc);

  	kfree(max8998);
  	return ret;
  }
  
  static int max8998_i2c_remove(struct i2c_client *i2c)
  {
  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  
  	mfd_remove_devices(max8998->dev);

  	max8998_irq_exit(max8998);
  	i2c_unregister_device(max8998->rtc);

  	kfree(max8998);
  
  	return 0;
  }
  
  static const struct i2c_device_id max8998_i2c_id[] = {

  	{ "max8998", TYPE_MAX8998 },
  	{ "lp3974", TYPE_LP3974},

  	{ }

  };
  MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);

  static int max8998_suspend(struct device *dev)
  {
  	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

  	if (device_may_wakeup(dev))

  		irq_set_irq_wake(max8998->irq, 1);

  	return 0;
  }
  
  static int max8998_resume(struct device *dev)
  {
  	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
  	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

  	if (device_may_wakeup(dev))

  		irq_set_irq_wake(max8998->irq, 0);

  	/*
  	 * In LP3974, if IRQ registers are not "read & clear"
  	 * when it's set during sleep, the interrupt becomes
  	 * disabled.
  	 */
  	return max8998_irq_resume(i2c_get_clientdata(i2c));
  }
  
  struct max8998_reg_dump {
  	u8	addr;
  	u8	val;
  };
  #define SAVE_ITEM(x)	{ .addr = (x), .val = 0x0, }

  static struct max8998_reg_dump max8998_dump[] = {

  	SAVE_ITEM(MAX8998_REG_IRQM1),
  	SAVE_ITEM(MAX8998_REG_IRQM2),
  	SAVE_ITEM(MAX8998_REG_IRQM3),
  	SAVE_ITEM(MAX8998_REG_IRQM4),
  	SAVE_ITEM(MAX8998_REG_STATUSM1),
  	SAVE_ITEM(MAX8998_REG_STATUSM2),
  	SAVE_ITEM(MAX8998_REG_CHGR1),
  	SAVE_ITEM(MAX8998_REG_CHGR2),
  	SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
  	SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
  	SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
  	SAVE_ITEM(MAX8998_REG_ONOFF1),
  	SAVE_ITEM(MAX8998_REG_ONOFF2),
  	SAVE_ITEM(MAX8998_REG_ONOFF3),
  	SAVE_ITEM(MAX8998_REG_ONOFF4),
  	SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
  	SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
  	SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
  	SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
  	SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
  	SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
  	SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
  	SAVE_ITEM(MAX8998_REG_LDO4),
  	SAVE_ITEM(MAX8998_REG_LDO5),
  	SAVE_ITEM(MAX8998_REG_LDO6),
  	SAVE_ITEM(MAX8998_REG_LDO7),
  	SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
  	SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
  	SAVE_ITEM(MAX8998_REG_LDO12),
  	SAVE_ITEM(MAX8998_REG_LDO13),
  	SAVE_ITEM(MAX8998_REG_LDO14),
  	SAVE_ITEM(MAX8998_REG_LDO15),
  	SAVE_ITEM(MAX8998_REG_LDO16),
  	SAVE_ITEM(MAX8998_REG_LDO17),
  	SAVE_ITEM(MAX8998_REG_BKCHR),
  	SAVE_ITEM(MAX8998_REG_LBCNFG1),
  	SAVE_ITEM(MAX8998_REG_LBCNFG2),
  };
  /* Save registers before hibernation */
  static int max8998_freeze(struct device *dev)
  {
  	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
  		max8998_read_reg(i2c, max8998_dump[i].addr,
  				&max8998_dump[i].val);
  
  	return 0;
  }
  
  /* Restore registers after hibernation */
  static int max8998_restore(struct device *dev)
  {
  	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
  		max8998_write_reg(i2c, max8998_dump[i].addr,
  				max8998_dump[i].val);
  
  	return 0;
  }

  static const struct dev_pm_ops max8998_pm = {

  	.suspend = max8998_suspend,
  	.resume = max8998_resume,
  	.freeze = max8998_freeze,
  	.restore = max8998_restore,
  };

  static struct i2c_driver max8998_i2c_driver = {
  	.driver = {
  		   .name = "max8998",
  		   .owner = THIS_MODULE,

  		   .pm = &max8998_pm,

  	},
  	.probe = max8998_i2c_probe,
  	.remove = max8998_i2c_remove,
  	.id_table = max8998_i2c_id,
  };
  
  static int __init max8998_i2c_init(void)
  {
  	return i2c_add_driver(&max8998_i2c_driver);
  }
  /* init early so consumer devices can complete system boot */
  subsys_initcall(max8998_i2c_init);
  
  static void __exit max8998_i2c_exit(void)
  {
  	i2c_del_driver(&max8998_i2c_driver);
  }
  module_exit(max8998_i2c_exit);
  
  MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
  MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
  MODULE_LICENSE("GPL");