ad7606_par.c

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/*
 * AD7606 Parallel Interface ADC driver
 *
 * Copyright 2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/io.h>

#include <linux/iio/iio.h>
#include "ad7606.h"

static int ad7606_par16_read_block(struct device *dev,
                 int count, void *buf)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct iio_dev *indio_dev = platform_get_drvdata(pdev);
    struct ad7606_state *st = iio_priv(indio_dev);

    insw((unsigned long) st->base_address, buf, count);

    return 0;
}

static const struct ad7606_bus_ops ad7606_par16_bops = {
    .read_block = ad7606_par16_read_block,
};

static int ad7606_par8_read_block(struct device *dev,
                 int count, void *buf)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct iio_dev *indio_dev = platform_get_drvdata(pdev);
    struct ad7606_state *st = iio_priv(indio_dev);

    insb((unsigned long) st->base_address, buf, count * 2);

    return 0;
}

static const struct ad7606_bus_ops ad7606_par8_bops = {
    .read_block = ad7606_par8_read_block,
};

static int __devinit ad7606_par_probe(struct platform_device *pdev)
{
    struct resource *res;
    struct iio_dev *indio_dev;
    void __iomem *addr;
    resource_size_t remap_size;
    int ret, irq;

    irq = platform_get_irq(pdev, 0);
    if (irq < 0) {
        dev_err(&pdev->dev, "no irq\n");
        return -ENODEV;
    }

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res)
        return -ENODEV;

    remap_size = resource_size(res);

    /* Request the regions */
    if (!request_mem_region(res->start, remap_size, "iio-ad7606")) {
        ret = -EBUSY;
        goto out1;
    }
    addr = ioremap(res->start, remap_size);
    if (!addr) {
        ret = -ENOMEM;
        goto out1;
    }

    indio_dev = ad7606_probe(&pdev->dev, irq, addr,
              platform_get_device_id(pdev)->driver_data,
              remap_size > 1 ? &ad7606_par16_bops :
              &ad7606_par8_bops);

    if (IS_ERR(indio_dev))  {
        ret = PTR_ERR(indio_dev);
        goto out2;
    }

    platform_set_drvdata(pdev, indio_dev);

    return 0;

out2:
    iounmap(addr);
out1:
    release_mem_region(res->start, remap_size);

    return ret;
}

static int __devexit ad7606_par_remove(struct platform_device *pdev)
{
    struct iio_dev *indio_dev = platform_get_drvdata(pdev);
    struct resource *res;
    struct ad7606_state *st = iio_priv(indio_dev);

    ad7606_remove(indio_dev, platform_get_irq(pdev, 0));

    iounmap(st->base_address);
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    release_mem_region(res->start, resource_size(res));

    platform_set_drvdata(pdev, NULL);

    return 0;
}

#ifdef CONFIG_PM
static int ad7606_par_suspend(struct device *dev)
{
    struct iio_dev *indio_dev = dev_get_drvdata(dev);

    ad7606_suspend(indio_dev);

    return 0;
}

static int ad7606_par_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_par_suspend,
    .resume  = ad7606_par_resume,
};
#define AD7606_PAR_PM_OPS (&ad7606_pm_ops)

#else
#define AD7606_PAR_PM_OPS NULL
#endif  /* CONFIG_PM */

static struct platform_device_id ad7606_driver_ids[] = {
    {
        .name       = "ad7606-8",
        .driver_data    = ID_AD7606_8,
    }, {
        .name       = "ad7606-6",
        .driver_data    = ID_AD7606_6,
    }, {
        .name       = "ad7606-4",
        .driver_data    = ID_AD7606_4,
    },
    { }
};

MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);

static struct platform_driver ad7606_driver = {
    .probe = ad7606_par_probe,
    .remove = __devexit_p(ad7606_par_remove),
    .id_table = ad7606_driver_ids,
    .driver = {
        .name    = "ad7606",
        .owner  = THIS_MODULE,
        .pm    = AD7606_PAR_PM_OPS,
    },
};

module_platform_driver(ad7606_driver);

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