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/spi/spi.h>
 24#include <linux/of.h>
 
 
 25
 26static ssize_t dac7512_store_val(struct device *dev,
 27				 struct device_attribute *attr,
 28				 const char *buf, size_t count)
 29{
 30	struct spi_device *spi = to_spi_device(dev);
 31	unsigned char tmp[2];
 32	unsigned long val;
 33	int ret;
 34
 35	ret = kstrtoul(buf, 10, &val);
 36	if (ret)
 37		return ret;
 38
 39	tmp[0] = val >> 8;
 40	tmp[1] = val & 0xff;
 41	spi_write(spi, tmp, sizeof(tmp));
 42	return count;
 43}
 44
 45static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val);
 46
 47static struct attribute *dac7512_attributes[] = {
 48	&dev_attr_value.attr,
 49	NULL
 50};
 51
 52static const struct attribute_group dac7512_attr_group = {
 53	.attrs = dac7512_attributes,
 54};
 55
 56static int dac7512_probe(struct spi_device *spi)
 57{
 58	int ret;
 59
 60	spi->bits_per_word = 8;
 61	spi->mode = SPI_MODE_0;
 62	ret = spi_setup(spi);
 63	if (ret < 0)
 64		return ret;
 65
 66	return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group);
 67}
 68
 69static int dac7512_remove(struct spi_device *spi)
 70{
 71	sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
 72	return 0;
 73}
 74
 75static const struct spi_device_id dac7512_id_table[] = {
 76	{ "dac7512", 0 },
 77	{ }
 78};
 79MODULE_DEVICE_TABLE(spi, dac7512_id_table);
 80
 81#ifdef CONFIG_OF
 82static const struct of_device_id dac7512_of_match[] = {
 83	{ .compatible = "ti,dac7512", },
 84	{ }
 85};
 86MODULE_DEVICE_TABLE(of, dac7512_of_match);
 87#endif
 88
 89static struct spi_driver dac7512_driver = {
 90	.driver = {
 91		.name	= "dac7512",
 92		.owner	= THIS_MODULE,
 93		.of_match_table = of_match_ptr(dac7512_of_match),
 94	},
 95	.probe	= dac7512_probe,
 96	.remove	= dac7512_remove,
 97	.id_table = dac7512_id_table,
 98};
 99
100module_spi_driver(dac7512_driver);
101
102MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
103MODULE_DESCRIPTION("DAC7512 16-bit DAC");
104MODULE_LICENSE("GPL v2");

 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
29static 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;
 
36
37	if (strict_strtoul(buf, 10, &val) < 0)
38		return -EINVAL;
 
39
40	tmp[0] = val >> 8;
41	tmp[1] = val & 0xff;
42	spi_write(spi, tmp, sizeof(tmp));
43	return count;
44}
45
46static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val);
47
48static struct attribute *dac7512_attributes[] = {
49	&dev_attr_value.attr,
50	NULL
51};
52
53static const struct attribute_group dac7512_attr_group = {
54	.attrs = dac7512_attributes,
55};
56
57static int __devinit dac7512_probe(struct spi_device *spi)
58{
59	int ret;
60
61	spi->bits_per_word = 8;
62	spi->mode = SPI_MODE_0;
63	ret = spi_setup(spi);
64	if (ret < 0)
65		return ret;
66
67	return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group);
68}
69
70static int __devexit dac7512_remove(struct spi_device *spi)
71{
72	sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
73	return 0;
74}
75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
76static struct spi_driver dac7512_driver = {
77	.driver = {
78		.name	= DAC7512_DRV_NAME,
79		.owner	= THIS_MODULE,
 
80	},
81	.probe	= dac7512_probe,
82	.remove	= __devexit_p(dac7512_remove),
 
83};
84
85module_spi_driver(dac7512_driver);
86
87MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
88MODULE_DESCRIPTION("DAC7512 16-bit DAC");
89MODULE_LICENSE("GPL v2");
90MODULE_VERSION(DRIVER_VERSION);