/*
   *
   * TWL4030 MADC Hwmon driver-This driver monitors the real time
   * conversion of analog signals like battery temperature,
   * battery type, battery level etc. User can ask for the conversion on a
   * particular channel using the sysfs nodes.
   *
   * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   * J Keerthy <j-keerthy@ti.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 by the Free Software Foundation.
   *
   * 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., 51 Franklin St, Fifth Floor, Boston, MA
   * 02110-1301 USA
   *
   */
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/i2c/twl.h>
  #include <linux/device.h>
  #include <linux/platform_device.h>
  #include <linux/i2c/twl4030-madc.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/stddef.h>
  #include <linux/sysfs.h>
  #include <linux/err.h>
  #include <linux/types.h>
  
  /*
   * sysfs hook function
   */
  static ssize_t madc_read(struct device *dev,
  			 struct device_attribute *devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct twl4030_madc_request req;
  	long val;
  
  	req.channels = (1 << attr->index);
  	req.method = TWL4030_MADC_SW2;
  	req.func_cb = NULL;
  	val = twl4030_madc_conversion(&req);
  	if (val < 0)
  		return val;
  
  	return sprintf(buf, "%d
  ", req.rbuf[attr->index]);
  }
  
  /* sysfs nodes to read individual channels from user side */
  static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0);
  static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1);
  static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2);
  static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3);
  static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4);
  static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5);
  static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6);
  static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7);
  static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8);
  static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9);
  static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10);
  static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11);
  static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12);
  static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15);
  
  static struct attribute *twl4030_madc_attributes[] = {
  	&sensor_dev_attr_in0_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_in2_input.dev_attr.attr,
  	&sensor_dev_attr_in3_input.dev_attr.attr,
  	&sensor_dev_attr_in4_input.dev_attr.attr,
  	&sensor_dev_attr_in5_input.dev_attr.attr,
  	&sensor_dev_attr_in6_input.dev_attr.attr,
  	&sensor_dev_attr_in7_input.dev_attr.attr,
  	&sensor_dev_attr_in8_input.dev_attr.attr,
  	&sensor_dev_attr_in9_input.dev_attr.attr,
  	&sensor_dev_attr_curr10_input.dev_attr.attr,
  	&sensor_dev_attr_in11_input.dev_attr.attr,
  	&sensor_dev_attr_in12_input.dev_attr.attr,
  	&sensor_dev_attr_in15_input.dev_attr.attr,
  	NULL
  };
  
  static const struct attribute_group twl4030_madc_group = {
  	.attrs = twl4030_madc_attributes,
  };
  
  static int __devinit twl4030_madc_hwmon_probe(struct platform_device *pdev)
  {
  	int ret;

  	struct device *hwmon;
  
  	ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group);
  	if (ret)
  		goto err_sysfs;
  	hwmon = hwmon_device_register(&pdev->dev);
  	if (IS_ERR(hwmon)) {
  		dev_err(&pdev->dev, "hwmon_device_register failed.
  ");

  		ret = PTR_ERR(hwmon);

  		goto err_reg;
  	}
  
  	return 0;
  
  err_reg:
  	sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
  err_sysfs:
  
  	return ret;
  }
  
  static int __devexit twl4030_madc_hwmon_remove(struct platform_device *pdev)
  {
  	hwmon_device_unregister(&pdev->dev);
  	sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
  
  	return 0;
  }
  
  static struct platform_driver twl4030_madc_hwmon_driver = {
  	.probe = twl4030_madc_hwmon_probe,
  	.remove = __exit_p(twl4030_madc_hwmon_remove),
  	.driver = {
  		   .name = "twl4030_madc_hwmon",
  		   .owner = THIS_MODULE,
  		   },
  };

  module_platform_driver(twl4030_madc_hwmon_driver);

  
  MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver");
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("J Keerthy");

  MODULE_ALIAS("platform:twl4030_madc_hwmon");