[deliverable/linux.git] / drivers / misc / ti_dac7512.c

/*
 *  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/init.h>
#include <linux/spi/spi.h>

#define DAC7512_DRV_NAME	"dac7512"
#define DRIVER_VERSION		"1.0"

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 struct spi_driver dac7512_driver = {
	.driver = {
		.name	= DAC7512_DRV_NAME,
		.owner	= THIS_MODULE,
	},
	.probe	= dac7512_probe,
	.remove	= dac7512_remove,
};

module_spi_driver(dac7512_driver);

MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("DAC7512 16-bit DAC");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRIVER_VERSION);
Commit	Line	Data
4d00928c DM	1	/*
	2	* dac7512.c - Linux kernel module for
	3	* Texas Instruments DAC7512
	4	*
	5	* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24	#include <linux/spi/spi.h>
	25
	26	#define DAC7512_DRV_NAME "dac7512"
	27	#define DRIVER_VERSION "1.0"
	28
	29	static ssize_t dac7512_store_val(struct device *dev,
	30	struct device_attribute *attr,
	31	const char *buf, size_t count)
	32	{
	33	struct spi_device *spi = to_spi_device(dev);
	34	unsigned char tmp[2];
	35	unsigned long val;
f7b41276	36	int ret;
4d00928c	37
f7b41276 JH	38	ret = kstrtoul(buf, 10, &val);
	39	if (ret)
	40	return ret;
4d00928c DM	41
	42	tmp[0] = val >> 8;
	43	tmp[1] = val & 0xff;
	44	spi_write(spi, tmp, sizeof(tmp));
	45	return count;
	46	}
	47
	48	static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val);
	49
	50	static struct attribute *dac7512_attributes[] = {
	51	&dev_attr_value.attr,
	52	NULL
	53	};
	54
	55	static const struct attribute_group dac7512_attr_group = {
	56	.attrs = dac7512_attributes,
	57	};
	58
80c8ae28	59	static int dac7512_probe(struct spi_device *spi)
4d00928c DM	60	{
	61	int ret;
	62
	63	spi->bits_per_word = 8;
	64	spi->mode = SPI_MODE_0;
	65	ret = spi_setup(spi);
	66	if (ret < 0)
	67	return ret;
	68
	69	return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group);
	70	}
	71
486a5c28	72	static int dac7512_remove(struct spi_device *spi)
4d00928c DM	73	{
	74	sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
	75	return 0;
	76	}
	77
	78	static struct spi_driver dac7512_driver = {
	79	.driver = {
	80	.name = DAC7512_DRV_NAME,
	81	.owner = THIS_MODULE,
	82	},
	83	.probe = dac7512_probe,
2d6bed9c	84	.remove = dac7512_remove,
4d00928c DM	85	};
4d00928c DM	86
a3dc3c9e	87	module_spi_driver(dac7512_driver);
4d00928c DM	88
	89	MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
	90	MODULE_DESCRIPTION("DAC7512 16-bit DAC");
	91	MODULE_LICENSE("GPL v2");
	92	MODULE_VERSION(DRIVER_VERSION);