text: /*
   * I2C access for DA9052 PMICs.
   *
   * Copyright(c) 2011 Dialog Semiconductor Ltd.
   *
   * Author: David Dajun Chen <dchen@diasemi.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.
   *
   */
  
  #include <linux/device.h>
  #include <linux/module.h>
  #include <linux/input.h>
  #include <linux/mfd/core.h>
  #include <linux/i2c.h>
  #include <linux/err.h>
  
  #include <linux/mfd/da9052/da9052.h>
  #include <linux/mfd/da9052/reg.h>
  
  static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
  {
  	int reg_val, ret;
  
  	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
  	if (ret < 0)
  		return ret;
  
  	if (reg_val & DA9052_CONTROL_B_WRITEMODE) {
  		reg_val &= ~DA9052_CONTROL_B_WRITEMODE;
  		ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
  				   reg_val);
  		if (ret < 0)
  			return ret;
  	}
  
  	return 0;
  }
  
  static int __devinit da9052_i2c_probe(struct i2c_client *client,
  				       const struct i2c_device_id *id)
  {
  	struct da9052 *da9052;
  	int ret;
  
  	da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL);
  	if (!da9052)
  		return -ENOMEM;
  
  	if (!i2c_check_functionality(client->adapter,
  				     I2C_FUNC_SMBUS_BYTE_DATA)) {
  		dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
  			 __func__);
  		ret = -ENODEV;
  		goto err;
  	}
  
  	da9052->dev = &client->dev;
  	da9052->chip_irq = client->irq;
  
  	i2c_set_clientdata(client, da9052);
  
  	da9052->regmap = regmap_init_i2c(client, &da9052_regmap_config);
  	if (IS_ERR(da9052->regmap)) {
  		ret = PTR_ERR(da9052->regmap);
  		dev_err(&client->dev, "Failed to allocate register map: %d\n",
  			ret);
  		goto err;
  	}
  
  	ret = da9052_i2c_enable_multiwrite(da9052);
  	if (ret < 0)
  		goto err;
  
  	ret = da9052_device_init(da9052, id->driver_data);
  	if (ret != 0)
  		goto err;
  
  	return 0;
  
  err:
  	kfree(da9052);
  	return ret;
  }
  
  static int da9052_i2c_remove(struct i2c_client *client)
  {
  	struct da9052 *da9052 = i2c_get_clientdata(client);
  
  	da9052_device_exit(da9052);
  	kfree(da9052);
  
  	return 0;
  }
  
  static struct i2c_device_id da9052_i2c_id[] = {
  	{"da9052", DA9052},
  	{"da9053-aa", DA9053_AA},
  	{"da9053-ba", DA9053_BA},
  	{"da9053-bb", DA9053_BB},
  	{}
  };
  
  static struct i2c_driver da9052_i2c_driver = {
  	.probe = da9052_i2c_probe,
  	.remove = da9052_i2c_remove,
  	.id_table = da9052_i2c_id,
  	.driver = {
  		.name = "da9052",
  		.owner = THIS_MODULE,
  	},
  };
  
  static int __init da9052_i2c_init(void)
  {
  	int ret;
  
  	ret = i2c_add_driver(&da9052_i2c_driver);
  	if (ret != 0) {
  		pr_err("DA9052 I2C registration failed %d\n", ret);
  		return ret;
  	}
  
  	return 0;
  }
  subsys_initcall(da9052_i2c_init);
  
  static void __exit da9052_i2c_exit(void)
  {
  	i2c_del_driver(&da9052_i2c_driver);
  }
  module_exit(da9052_i2c_exit);
  
  MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
  MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
  MODULE_LICENSE("GPL");
  