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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 const char * const 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\n", 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\n", 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)
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_attrs[] = {
&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,
};
ATTRIBUTE_GROUPS(wm8350);
static int wm8350_hwmon_probe(struct platform_device *pdev)
{
struct wm8350 *wm8350 = platform_get_drvdata(pdev);
struct device *hwmon_dev;
hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350",
wm8350,
wm8350_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static struct platform_driver wm8350_hwmon_driver = {
.probe = wm8350_hwmon_probe,
.driver = {
.name = "wm8350-hwmon",
},
};
module_platform_driver(wm8350_hwmon_driver);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8350-hwmon");
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