LXR linux/drivers/staging/iio/adc/ad7606

   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
  19static 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
  38static const struct ad7606_bus_ops ad7606_spi_bops = {
  39        .read_block     = ad7606_spi_read_block,
  40};
  41
  42static 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
  58static 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
  66static 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
  75static 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
  84static 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
  95static 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};
 101MODULE_DEVICE_TABLE(spi, ad7606_id);
 102
 103static 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};
 112module_spi_driver(ad7606_driver);
 113
 114MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 115MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 116MODULE_LICENSE("GPL v2");
 117