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

   1/*
   2 * AD7606 Parallel Interface 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/platform_device.h>
  11#include <linux/types.h>
  12#include <linux/err.h>
  13#include <linux/io.h>
  14
  15#include <linux/iio/iio.h>
  16#include "ad7606.h"
  17
  18static int ad7606_par16_read_block(struct device *dev,
  19                                   int count, void *buf)
  20{
  21        struct iio_dev *indio_dev = dev_get_drvdata(dev);
  22        struct ad7606_state *st = iio_priv(indio_dev);
  23
  24        insw((unsigned long)st->base_address, buf, count);
  25
  26        return 0;
  27}
  28
  29static const struct ad7606_bus_ops ad7606_par16_bops = {
  30        .read_block     = ad7606_par16_read_block,
  31};
  32
  33static int ad7606_par8_read_block(struct device *dev,
  34                                  int count, void *buf)
  35{
  36        struct iio_dev *indio_dev = dev_get_drvdata(dev);
  37        struct ad7606_state *st = iio_priv(indio_dev);
  38
  39        insb((unsigned long)st->base_address, buf, count * 2);
  40
  41        return 0;
  42}
  43
  44static const struct ad7606_bus_ops ad7606_par8_bops = {
  45        .read_block     = ad7606_par8_read_block,
  46};
  47
  48static int ad7606_par_probe(struct platform_device *pdev)
  49{
  50        const struct platform_device_id *id = platform_get_device_id(pdev);
  51        struct resource *res;
  52        void __iomem *addr;
  53        resource_size_t remap_size;
  54        int irq;
  55
  56        irq = platform_get_irq(pdev, 0);
  57        if (irq < 0) {
  58                dev_err(&pdev->dev, "no irq: %d\n", irq);
  59                return irq;
  60        }
  61
  62        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  63        addr = devm_ioremap_resource(&pdev->dev, res);
  64        if (IS_ERR(addr))
  65                return PTR_ERR(addr);
  66
  67        remap_size = resource_size(res);
  68
  69        return ad7606_probe(&pdev->dev, irq, addr,
  70                            id->name, id->driver_data,
  71                            remap_size > 1 ? &ad7606_par16_bops :
  72                            &ad7606_par8_bops);
  73}
  74
  75static int ad7606_par_remove(struct platform_device *pdev)
  76{
  77        return ad7606_remove(&pdev->dev, platform_get_irq(pdev, 0));
  78}
  79
  80static const struct platform_device_id ad7606_driver_ids[] = {
  81        {
  82                .name           = "ad7606-8",
  83                .driver_data    = ID_AD7606_8,
  84        }, {
  85                .name           = "ad7606-6",
  86                .driver_data    = ID_AD7606_6,
  87        }, {
  88                .name           = "ad7606-4",
  89                .driver_data    = ID_AD7606_4,
  90        },
  91        { }
  92};
  93
  94MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
  95
  96static struct platform_driver ad7606_driver = {
  97        .probe = ad7606_par_probe,
  98        .remove = ad7606_par_remove,
  99        .id_table = ad7606_driver_ids,
 100        .driver = {
 101                .name    = "ad7606",
 102                .pm      = AD7606_PM_OPS,
 103        },
 104};
 105
 106module_platform_driver(ad7606_driver);
 107
 108MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 109MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 110MODULE_LICENSE("GPL v2");
 111