6b13f685e
 김민수
BSP 최초 추가
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/*
* ads1000.c - driver for the ads1000 12-bit A/D converter
*
* Copyright (C) Boundary Devices
*
* Inspired by ADS1015 driver by Dirk Eibach
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c/ads1000.h>
#include <linux/i2c.h>
/* sysfs callback function */
static ssize_t show
(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct ads1000_platform_data *pdata = client->dev.platform_data;
s32 data = i2c_smbus_read_word_data(client, 0);
if (0 > data) {
pr_err("%s: error %d reading reg
",
__FILE__, data);
} else {
data = swab16(data);
}
if (pdata && pdata->denominator)
data = (data * pdata->numerator)/pdata->denominator;
else
pr_err("%s: invalid platform data
", __FILE__);
return (data < 0) ? data : sprintf(buf, "%d
", data);
}
static const struct sensor_device_attribute ads1000_attr =
SENSOR_ATTR(mv, S_IRUGO, show, NULL, 0);
/*
* Driver interface
*/
static int ads1000_remove(struct i2c_client *client)
{
device_remove_file(&client->dev, &ads1000_attr.dev_attr);
return 0;
}
static int ads1000_probe
(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ads1000_platform_data *pdata = client->dev.platform_data;
int err = device_create_file(&client->dev, &ads1000_attr.dev_attr);
if (0 > err) {
dev_err(&client->dev, "%s: error %d creating %s
",
__func__, err, ads1000_attr.dev_attr.attr.name);
}
if ((0 == err) && (0 == pdata)) {
struct device_node *np = client->dev.of_node;
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
pdata->numerator = 1;
pdata->denominator = 1;
client->dev.platform_data = pdata;
if (np) {
if (of_property_read_u32(np, "numerator",
&pdata->numerator)){
dev_err(&client->dev,
"%s: default to numerator == 1
",
__func__);
pdata->numerator = 1;
}
if (of_property_read_u32(np, "denominator",
&pdata->denominator)) {
dev_err(&client->dev,
"%s: default to denominator == 1
",
__func__);
pdata->denominator = 1;
}
} else
dev_err(&client->dev,
"%s: no device tree/no platform data
",
__func__);
}
return err;
}
static const struct i2c_device_id ads1000_id[] = {
{ "ads1000", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, ads1000_id);
static struct i2c_driver ads1000_driver = {
.driver = {
.name = "ads1000",
},
.probe = ads1000_probe,
.remove = ads1000_remove,
.id_table = ads1000_id,
};
static int __init ads1000_init(void)
{
return i2c_add_driver(&ads1000_driver);
}
static void __exit ads1000_exit(void)
{
i2c_del_driver(&ads1000_driver);
}
MODULE_AUTHOR("Eric Nelson <eric.nelson@boundarydevices.com>");
MODULE_DESCRIPTION("ADS1000 driver");
MODULE_LICENSE("GPL");
module_init(ads1000_init);
module_exit(ads1000_exit);
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