Eric Lee / smarc-fsl-linux-kernel

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drivers/hwmon/wm8350-hwmon.c 3.82 KB
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fb6c023a2   Mark Brown   hwmon: Add WM835x... 
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  /*
   * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC
   *                                  hardware monitoring features.
   *
   * Copyright (C) 2009 Wolfson Microelectronics plc
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License v2 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 Street, Fifth Floor, Boston, MA  02110-1301, USA
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/err.h>
  #include <linux/platform_device.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  
  #include <linux/mfd/wm8350/core.h>
  #include <linux/mfd/wm8350/comparator.h>
  
  static ssize_t show_name(struct device *dev,
  			 struct device_attribute *attr, char *buf)
  {
  	return sprintf(buf, "wm8350
  ");
  }
  
  static const char *input_names[] = {
  	[WM8350_AUXADC_USB]  = "USB",
  	[WM8350_AUXADC_LINE] = "Line",
  	[WM8350_AUXADC_BATT] = "Battery",
  };
  
  
  static ssize_t show_voltage(struct device *dev,
  			    struct device_attribute *attr, char *buf)
  {
  	struct wm8350 *wm8350 = dev_get_drvdata(dev);
  	int channel = to_sensor_dev_attr(attr)->index;
  	int val;
  
  	val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF;
  	val = DIV_ROUND_CLOSEST(val, 1000);
  
  	return sprintf(buf, "%d
  ", val);
  }
  
  static ssize_t show_label(struct device *dev,
  			  struct device_attribute *attr, char *buf)
  {
  	int channel = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%s
  ", input_names[channel]);
  }
  
  #define WM8350_NAMED_VOLTAGE(id, name) \
  	static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\
  				  NULL, name);		\
  	static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,	\
  				  NULL, name)
  
  static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  
  WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
  WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
  WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
  
  static struct attribute *wm8350_attributes[] = {
  	&dev_attr_name.attr,
  
  	&sensor_dev_attr_in0_input.dev_attr.attr,
  	&sensor_dev_attr_in0_label.dev_attr.attr,
  	&sensor_dev_attr_in1_input.dev_attr.attr,
  	&sensor_dev_attr_in1_label.dev_attr.attr,
  	&sensor_dev_attr_in2_input.dev_attr.attr,
  	&sensor_dev_attr_in2_label.dev_attr.attr,
  
  	NULL,
  };
  
  static const struct attribute_group wm8350_attr_group = {
  	.attrs	= wm8350_attributes,
  };
  
  static int __devinit wm8350_hwmon_probe(struct platform_device *pdev)
  {
  	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
  	int ret;
  
  	ret = sysfs_create_group(&pdev->dev.kobj, &wm8350_attr_group);
  	if (ret)
  		goto err;
  
  	wm8350->hwmon.classdev = hwmon_device_register(&pdev->dev);
  	if (IS_ERR(wm8350->hwmon.classdev)) {
  		ret = PTR_ERR(wm8350->hwmon.classdev);
  		goto err_group;
  	}
  
  	return 0;
  
  err_group:
  	sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group);
  err:
  	return ret;
  }
  
  static int __devexit wm8350_hwmon_remove(struct platform_device *pdev)
  {
  	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
  
  	hwmon_device_unregister(wm8350->hwmon.classdev);
  	sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group);
  
  	return 0;
  }
  
  static struct platform_driver wm8350_hwmon_driver = {
  	.probe = wm8350_hwmon_probe,
  	.remove = __devexit_p(wm8350_hwmon_remove),
  	.driver = {
  		.name = "wm8350-hwmon",
  		.owner = THIS_MODULE,
  	},
  };
25a236a5d   Axel Lin   hwmon: convert dr... 
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  module_platform_driver(wm8350_hwmon_driver);
fb6c023a2   Mark Brown   hwmon: Add WM835x... 
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  MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
  MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:wm8350-hwmon");