1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*
* AD7606 SPI ADC driver
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/iio/iio.h>
#include "ad7606.h"
#define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */
static int ad7606_spi_read_block(struct device *dev,
int count, void *buf)
{
struct spi_device *spi = to_spi_device(dev);
int i, ret;
unsigned short *data = buf;
__be16 *bdata = buf;
ret = spi_read(spi, buf, count * 2);
if (ret < 0) {
dev_err(&spi->dev, "SPI read error\n");
return ret;
}
for (i = 0; i < count; i++)
data[i] = be16_to_cpu(bdata[i]);
return 0;
}
static const struct ad7606_bus_ops ad7606_spi_bops = {
.read_block = ad7606_spi_read_block,
};
static int ad7606_spi_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
indio_dev = ad7606_probe(&spi->dev, spi->irq, NULL,
spi_get_device_id(spi)->driver_data,
&ad7606_spi_bops);
if (IS_ERR(indio_dev))
return PTR_ERR(indio_dev);
spi_set_drvdata(spi, indio_dev);
return 0;
}
static int ad7606_spi_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
return ad7606_remove(indio_dev, spi->irq);
}
static const struct spi_device_id ad7606_id[] = {
{"ad7606-8", ID_AD7606_8},
{"ad7606-6", ID_AD7606_6},
{"ad7606-4", ID_AD7606_4},
{}
};
MODULE_DEVICE_TABLE(spi, ad7606_id);
static struct spi_driver ad7606_driver = {
.driver = {
.name = "ad7606",
.pm = AD7606_PM_OPS,
},
.probe = ad7606_spi_probe,
.remove = ad7606_spi_remove,
.id_table = ad7606_id,
};
module_spi_driver(ad7606_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
MODULE_LICENSE("GPL v2");
|
