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drivers/misc: add driver for Texas Instruments DAC7512

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Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: "H Hartley Sweeten" <hartleys@visionengravers.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Mack 2009-12-14 18:00:17 -08:00 committed by Linus Torvalds
parent c0f68c2fab
commit 4d00928c1f
3 changed files with 112 additions and 0 deletions
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10
drivers/misc/Kconfig
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@ -270,6 +270,16 @@ config DS1682
This driver can also be built as a module. If so, the module
will be called ds1682.
config TI_DAC7512
tristate "Texas Instruments DAC7512"
depends on SPI && SYSFS
help
If you say yes here you get support for the Texas Instruments
DAC7512 16-bit digital-to-analog converter.
This driver can also be built as a module. If so, the module
will be calles ti_dac7512.
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"

1
drivers/misc/Makefile
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@ -22,6 +22,7 @@ obj-$(CONFIG_HP_ILO) += hpilo.o
obj-$(CONFIG_ISL29003) += isl29003.o
obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
obj-$(CONFIG_DS1682) += ds1682.o
obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
obj-$(CONFIG_C2PORT) += c2port/
obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/
obj-y += eeprom/

101
drivers/misc/ti_dac7512.c Normal file
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@ -0,0 +1,101 @@
/*
* 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;
if (strict_strtoul(buf, 10, &val) < 0)
return -EINVAL;
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 __devinit 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 __devexit 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 = __devexit_p(dac7512_remove),
};
static int __init dac7512_init(void)
{
return spi_register_driver(&dac7512_driver);
}
static void __exit dac7512_exit(void)
{
spi_unregister_driver(&dac7512_driver);
}
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("DAC7512 16-bit DAC");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRIVER_VERSION);
module_init(dac7512_init);
module_exit(dac7512_exit);