247 строки
6.8 KiB
C
247 строки
6.8 KiB
C
/*
|
|
* Driver for the Freescale Semiconductor MC13783 adc.
|
|
*
|
|
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
* Copyright (C) 2009 Sascha Hauer, Pengutronix
|
|
*
|
|
* 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., 51
|
|
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/mfd/mc13783.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
|
|
#define MC13783_ADC_NAME "mc13783-adc"
|
|
|
|
struct mc13783_adc_priv {
|
|
struct mc13783 *mc13783;
|
|
struct device *hwmon_dev;
|
|
};
|
|
|
|
static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute
|
|
*devattr, char *buf)
|
|
{
|
|
return sprintf(buf, "mc13783_adc\n");
|
|
}
|
|
|
|
static int mc13783_adc_read(struct device *dev,
|
|
struct device_attribute *devattr, unsigned int *val)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
unsigned int channel = attr->index;
|
|
unsigned int sample[4];
|
|
int ret;
|
|
|
|
ret = mc13783_adc_do_conversion(priv->mc13783,
|
|
MC13783_ADC_MODE_MULT_CHAN,
|
|
channel, sample);
|
|
if (ret)
|
|
return ret;
|
|
|
|
channel &= 0x7;
|
|
|
|
*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t mc13783_adc_read_bp(struct device *dev,
|
|
struct device_attribute *devattr, char *buf)
|
|
{
|
|
unsigned val;
|
|
int ret = mc13783_adc_read(dev, devattr, &val);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* BP (channel 2) reports with offset 2.4V to the actual value to fit
|
|
* the input range of the ADC. unit = 2.25mV = 9/4 mV.
|
|
*/
|
|
val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
|
|
|
|
return sprintf(buf, "%u\n", val);
|
|
}
|
|
|
|
static ssize_t mc13783_adc_read_gp(struct device *dev,
|
|
struct device_attribute *devattr, char *buf)
|
|
{
|
|
unsigned val;
|
|
int ret = mc13783_adc_read(dev, devattr, &val);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* input range is [0, 2.3V], val has 10 bits, so each bit
|
|
* is worth 9/4 mV.
|
|
*/
|
|
val = DIV_ROUND_CLOSEST(val * 9, 4);
|
|
|
|
return sprintf(buf, "%u\n", val);
|
|
}
|
|
|
|
static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL);
|
|
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
|
|
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6);
|
|
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7);
|
|
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8);
|
|
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9);
|
|
static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10);
|
|
static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11);
|
|
static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12);
|
|
static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
|
|
static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
|
|
static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);
|
|
|
|
static struct attribute *mc13783_attr[] = {
|
|
&dev_attr_name.attr,
|
|
&sensor_dev_attr_in2_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_in10_input.dev_attr.attr,
|
|
&sensor_dev_attr_in11_input.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group mc13783_group = {
|
|
.attrs = mc13783_attr,
|
|
};
|
|
|
|
/* last four channels may be occupied by the touchscreen */
|
|
static struct attribute *mc13783_attr_ts[] = {
|
|
&sensor_dev_attr_in12_input.dev_attr.attr,
|
|
&sensor_dev_attr_in13_input.dev_attr.attr,
|
|
&sensor_dev_attr_in14_input.dev_attr.attr,
|
|
&sensor_dev_attr_in15_input.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group mc13783_group_ts = {
|
|
.attrs = mc13783_attr_ts,
|
|
};
|
|
|
|
static int mc13783_adc_use_touchscreen(struct platform_device *pdev)
|
|
{
|
|
struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
|
|
unsigned flags = mc13783_get_flags(priv->mc13783);
|
|
|
|
return flags & MC13783_USE_TOUCHSCREEN;
|
|
}
|
|
|
|
static int __init mc13783_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct mc13783_adc_priv *priv;
|
|
int ret;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
/* Register sysfs hooks */
|
|
ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group);
|
|
if (ret)
|
|
goto out_err_create1;
|
|
|
|
if (!mc13783_adc_use_touchscreen(pdev)) {
|
|
ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
|
|
if (ret)
|
|
goto out_err_create2;
|
|
}
|
|
|
|
priv->hwmon_dev = hwmon_device_register(&pdev->dev);
|
|
if (IS_ERR(priv->hwmon_dev)) {
|
|
ret = PTR_ERR(priv->hwmon_dev);
|
|
dev_err(&pdev->dev,
|
|
"hwmon_device_register failed with %d.\n", ret);
|
|
goto out_err_register;
|
|
}
|
|
|
|
|
|
return 0;
|
|
|
|
out_err_register:
|
|
|
|
if (!mc13783_adc_use_touchscreen(pdev))
|
|
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
|
|
out_err_create2:
|
|
|
|
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
|
|
out_err_create1:
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
kfree(priv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit mc13783_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
|
|
|
|
hwmon_device_unregister(priv->hwmon_dev);
|
|
|
|
if (!mc13783_adc_use_touchscreen(pdev))
|
|
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
|
|
|
|
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver mc13783_adc_driver = {
|
|
.remove = __devexit_p(mc13783_adc_remove),
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = MC13783_ADC_NAME,
|
|
},
|
|
};
|
|
|
|
static int __init mc13783_adc_init(void)
|
|
{
|
|
return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe);
|
|
}
|
|
|
|
static void __exit mc13783_adc_exit(void)
|
|
{
|
|
platform_driver_unregister(&mc13783_adc_driver);
|
|
}
|
|
|
|
module_init(mc13783_adc_init);
|
|
module_exit(mc13783_adc_exit);
|
|
|
|
MODULE_DESCRIPTION("MC13783 ADC driver");
|
|
MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" MC13783_ADC_NAME);
|