2 * dac7512.c - Linux kernel module for
3 * Texas Instruments DAC7512
5 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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.
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.
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.
22 #include <linux/module.h>
23 #include <linux/spi/spi.h>
26 static ssize_t dac7512_store_val(struct device *dev,
27 struct device_attribute *attr,
28 const char *buf, size_t count)
30 struct spi_device *spi = to_spi_device(dev);
35 ret = kstrtoul(buf, 10, &val);
41 spi_write(spi, tmp, sizeof(tmp));
45 static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val);
47 static struct attribute *dac7512_attributes[] = {
52 static const struct attribute_group dac7512_attr_group = {
53 .attrs = dac7512_attributes,
56 static int dac7512_probe(struct spi_device *spi)
60 spi->bits_per_word = 8;
61 spi->mode = SPI_MODE_0;
66 return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group);
69 static int dac7512_remove(struct spi_device *spi)
71 sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
75 static const struct spi_device_id dac7512_id_table[] = {
79 MODULE_DEVICE_TABLE(spi, dac7512_id_table);
82 static const struct of_device_id dac7512_of_match[] = {
83 { .compatible = "ti,dac7512", },
86 MODULE_DEVICE_TABLE(of, dac7512_of_match);
89 static struct spi_driver dac7512_driver = {
92 .of_match_table = of_match_ptr(dac7512_of_match),
94 .probe = dac7512_probe,
95 .remove = dac7512_remove,
96 .id_table = dac7512_id_table,
99 module_spi_driver(dac7512_driver);
101 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
102 MODULE_DESCRIPTION("DAC7512 16-bit DAC");
103 MODULE_LICENSE("GPL v2");