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        __be16 *bdata = buf;
  26
  27        ret = spi_read(spi, buf, count * 2);
  28        if (ret < 0) {
  29                dev_err(&spi->dev, "SPI read error\n");
  30                return ret;
  31        }
  32
  33        for (i = 0; i < count; i++)
  34                data[i] = be16_to_cpu(bdata[i]);
  35
  36        return 0;
  37}
  38
  39static const struct ad7606_bus_ops ad7606_spi_bops = {
  40        .read_block     = ad7606_spi_read_block,
  41};
  42
  43static int ad7606_spi_probe(struct spi_device *spi)
  44{
  45        struct iio_dev *indio_dev;
  46
  47        indio_dev = ad7606_probe(&spi->dev, spi->irq, NULL,
  48                                 spi_get_device_id(spi)->driver_data,
  49                                 &ad7606_spi_bops);
  50
  51        if (IS_ERR(indio_dev))
  52                return PTR_ERR(indio_dev);
  53
  54        spi_set_drvdata(spi, indio_dev);
  55
  56        return 0;
  57}
  58
  59static int ad7606_spi_remove(struct spi_device *spi)
  60{
  61        struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
  62
  63        return ad7606_remove(indio_dev, spi->irq);
  64}
  65
  66static const struct spi_device_id ad7606_id[] = {
  67        {"ad7606-8", ID_AD7606_8},
  68        {"ad7606-6", ID_AD7606_6},
  69        {"ad7606-4", ID_AD7606_4},
  70        {}
  71};
  72MODULE_DEVICE_TABLE(spi, ad7606_id);
  73
  74static struct spi_driver ad7606_driver = {
  75        .driver = {
  76                .name = "ad7606",
  77                .pm = AD7606_PM_OPS,
  78        },
  79        .probe = ad7606_spi_probe,
  80        .remove = ad7606_spi_remove,
  81        .id_table = ad7606_id,
  82};
  83module_spi_driver(ad7606_driver);
  84
  85MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
  86MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
  87MODULE_LICENSE("GPL v2");
  88