ad7606_spi.c

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/*
 * 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;

    ret = spi_read(spi, (u8 *)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(data[i]);

    return 0;
}

static const struct ad7606_bus_ops ad7606_spi_bops = {
    .read_block = ad7606_spi_read_block,
};

static int __devinit 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 __devexit ad7606_spi_remove(struct spi_device *spi)
{
    struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);

    return ad7606_remove(indio_dev, spi->irq);
}

#ifdef CONFIG_PM
static int ad7606_spi_suspend(struct device *dev)
{
    struct iio_dev *indio_dev = dev_get_drvdata(dev);

    ad7606_suspend(indio_dev);

    return 0;
}

static int ad7606_spi_resume(struct device *dev)
{
    struct iio_dev *indio_dev = dev_get_drvdata(dev);

    ad7606_resume(indio_dev);

    return 0;
}

static const struct dev_pm_ops ad7606_pm_ops = {
    .suspend = ad7606_spi_suspend,
    .resume  = ad7606_spi_resume,
};
#define AD7606_SPI_PM_OPS (&ad7606_pm_ops)

#else
#define AD7606_SPI_PM_OPS NULL
#endif

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",
        .owner = THIS_MODULE,
        .pm    = AD7606_SPI_PM_OPS,
    },
    .probe = ad7606_spi_probe,
    .remove = __devexit_p(ad7606_spi_remove),
    .id_table = ad7606_id,
};
module_spi_driver(ad7606_driver);

MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
MODULE_LICENSE("GPL v2");