1 /*
2 * AD7606 SPI ADC driver
3 *
4 * Copyright 2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2.
7 */
8
9 #include <linux/module.h>
10 #include <linux/spi/spi.h>
11 #include <linux/types.h>
12 #include <linux/err.h>
13
14 #include <linux/iio/iio.h>
15 #include "ad7606.h"
16
17 #define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */
18
ad7606_spi_read_block(struct device * dev,int count,void * buf)19 static int ad7606_spi_read_block(struct device *dev,
20 int count, void *buf)
21 {
22 struct spi_device *spi = to_spi_device(dev);
23 int i, ret;
24 unsigned short *data = buf;
25
26 ret = spi_read(spi, buf, count * 2);
27 if (ret < 0) {
28 dev_err(&spi->dev, "SPI read error\n");
29 return ret;
30 }
31
32 for (i = 0; i < count; i++)
33 data[i] = be16_to_cpu(data[i]);
34
35 return 0;
36 }
37
38 static const struct ad7606_bus_ops ad7606_spi_bops = {
39 .read_block = ad7606_spi_read_block,
40 };
41
ad7606_spi_probe(struct spi_device * spi)42 static int ad7606_spi_probe(struct spi_device *spi)
43 {
44 struct iio_dev *indio_dev;
45
46 indio_dev = ad7606_probe(&spi->dev, spi->irq, NULL,
47 spi_get_device_id(spi)->driver_data,
48 &ad7606_spi_bops);
49
50 if (IS_ERR(indio_dev))
51 return PTR_ERR(indio_dev);
52
53 spi_set_drvdata(spi, indio_dev);
54
55 return 0;
56 }
57
ad7606_spi_remove(struct spi_device * spi)58 static int ad7606_spi_remove(struct spi_device *spi)
59 {
60 struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
61
62 return ad7606_remove(indio_dev, spi->irq);
63 }
64
65 #ifdef CONFIG_PM
ad7606_spi_suspend(struct device * dev)66 static int ad7606_spi_suspend(struct device *dev)
67 {
68 struct iio_dev *indio_dev = dev_get_drvdata(dev);
69
70 ad7606_suspend(indio_dev);
71
72 return 0;
73 }
74
ad7606_spi_resume(struct device * dev)75 static int ad7606_spi_resume(struct device *dev)
76 {
77 struct iio_dev *indio_dev = dev_get_drvdata(dev);
78
79 ad7606_resume(indio_dev);
80
81 return 0;
82 }
83
84 static const struct dev_pm_ops ad7606_pm_ops = {
85 .suspend = ad7606_spi_suspend,
86 .resume = ad7606_spi_resume,
87 };
88
89 #define AD7606_SPI_PM_OPS (&ad7606_pm_ops)
90
91 #else
92 #define AD7606_SPI_PM_OPS NULL
93 #endif
94
95 static const struct spi_device_id ad7606_id[] = {
96 {"ad7606-8", ID_AD7606_8},
97 {"ad7606-6", ID_AD7606_6},
98 {"ad7606-4", ID_AD7606_4},
99 {}
100 };
101 MODULE_DEVICE_TABLE(spi, ad7606_id);
102
103 static struct spi_driver ad7606_driver = {
104 .driver = {
105 .name = "ad7606",
106 .pm = AD7606_SPI_PM_OPS,
107 },
108 .probe = ad7606_spi_probe,
109 .remove = ad7606_spi_remove,
110 .id_table = ad7606_id,
111 };
112 module_spi_driver(ad7606_driver);
113
114 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
115 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
116 MODULE_LICENSE("GPL v2");
117