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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> | |
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 | }; |
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); |