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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> | |
f91f9258 | 25 | #include <linux/of.h> |
4d00928c | 26 | |
4d00928c DM |
27 | static ssize_t dac7512_store_val(struct device *dev, |
28 | struct device_attribute *attr, | |
29 | const char *buf, size_t count) | |
30 | { | |
31 | struct spi_device *spi = to_spi_device(dev); | |
32 | unsigned char tmp[2]; | |
33 | unsigned long val; | |
f7b41276 | 34 | int ret; |
4d00928c | 35 | |
f7b41276 JH |
36 | ret = kstrtoul(buf, 10, &val); |
37 | if (ret) | |
38 | return ret; | |
4d00928c DM |
39 | |
40 | tmp[0] = val >> 8; | |
41 | tmp[1] = val & 0xff; | |
42 | spi_write(spi, tmp, sizeof(tmp)); | |
43 | return count; | |
44 | } | |
45 | ||
46 | static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val); | |
47 | ||
48 | static struct attribute *dac7512_attributes[] = { | |
49 | &dev_attr_value.attr, | |
50 | NULL | |
51 | }; | |
52 | ||
53 | static const struct attribute_group dac7512_attr_group = { | |
54 | .attrs = dac7512_attributes, | |
55 | }; | |
56 | ||
80c8ae28 | 57 | static int dac7512_probe(struct spi_device *spi) |
4d00928c DM |
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 | ||
486a5c28 | 70 | static int dac7512_remove(struct spi_device *spi) |
4d00928c DM |
71 | { |
72 | sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group); | |
73 | return 0; | |
74 | } | |
75 | ||
beb900fc DM |
76 | static const struct spi_device_id dac7512_id_table[] = { |
77 | { "dac7512", 0 }, | |
78 | { } | |
79 | }; | |
80 | MODULE_DEVICE_TABLE(spi, dac7512_id_table); | |
81 | ||
f91f9258 DM |
82 | #ifdef CONFIG_OF |
83 | static const struct of_device_id dac7512_of_match[] = { | |
84 | { .compatible = "ti,dac7512", }, | |
85 | { } | |
86 | }; | |
87 | MODULE_DEVICE_TABLE(of, dac7512_of_match); | |
88 | #endif | |
89 | ||
4d00928c DM |
90 | static struct spi_driver dac7512_driver = { |
91 | .driver = { | |
e0646505 | 92 | .name = "dac7512", |
4d00928c | 93 | .owner = THIS_MODULE, |
f91f9258 | 94 | .of_match_table = of_match_ptr(dac7512_of_match), |
4d00928c DM |
95 | }, |
96 | .probe = dac7512_probe, | |
2d6bed9c | 97 | .remove = dac7512_remove, |
beb900fc | 98 | .id_table = dac7512_id_table, |
4d00928c DM |
99 | }; |
100 | ||
a3dc3c9e | 101 | module_spi_driver(dac7512_driver); |
4d00928c DM |
102 | |
103 | MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); | |
104 | MODULE_DESCRIPTION("DAC7512 16-bit DAC"); | |
105 | MODULE_LICENSE("GPL v2"); |