/*
|
* dac7512.c - Linux kernel module for
|
* Texas Instruments DAC7512
|
*
|
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
|
*
|
* 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/spi/spi.h>
|
#include <linux/of.h>
|
|
static ssize_t dac7512_store_val(struct device *dev,
|
struct device_attribute *attr,
|
const char *buf, size_t count)
|
{
|
struct spi_device *spi = to_spi_device(dev);
|
unsigned char tmp[2];
|
unsigned long val;
|
int ret;
|
|
ret = kstrtoul(buf, 10, &val);
|
if (ret)
|
return ret;
|
|
tmp[0] = val >> 8;
|
tmp[1] = val & 0xff;
|
spi_write(spi, tmp, sizeof(tmp));
|
return count;
|
}
|
|
static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val);
|
|
static struct attribute *dac7512_attributes[] = {
|
&dev_attr_value.attr,
|
NULL
|
};
|
|
static const struct attribute_group dac7512_attr_group = {
|
.attrs = dac7512_attributes,
|
};
|
|
static int dac7512_probe(struct spi_device *spi)
|
{
|
int ret;
|
|
spi->bits_per_word = 8;
|
spi->mode = SPI_MODE_0;
|
ret = spi_setup(spi);
|
if (ret < 0)
|
return ret;
|
|
return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group);
|
}
|
|
static int dac7512_remove(struct spi_device *spi)
|
{
|
sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
|
return 0;
|
}
|
|
static const struct spi_device_id dac7512_id_table[] = {
|
{ "dac7512", 0 },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(spi, dac7512_id_table);
|
|
#ifdef CONFIG_OF
|
static const struct of_device_id dac7512_of_match[] = {
|
{ .compatible = "ti,dac7512", },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(of, dac7512_of_match);
|
#endif
|
|
static struct spi_driver dac7512_driver = {
|
.driver = {
|
.name = "dac7512",
|
.of_match_table = of_match_ptr(dac7512_of_match),
|
},
|
.probe = dac7512_probe,
|
.remove = dac7512_remove,
|
.id_table = dac7512_id_table,
|
};
|
|
module_spi_driver(dac7512_driver);
|
|
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
|
MODULE_DESCRIPTION("DAC7512 16-bit DAC");
|
MODULE_LICENSE("GPL v2");
|
