text: /*
   * 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;
  	__be16 *bdata = buf;
  
  	ret = spi_read(spi, 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(bdata[i]);
  
  	return 0;
  }
  
  static const struct ad7606_bus_ops ad7606_spi_bops = {
  	.read_block	= ad7606_spi_read_block,
  };
  
  static int ad7606_spi_probe(struct spi_device *spi)
  {
  	const struct spi_device_id *id = spi_get_device_id(spi);
  
  	return ad7606_probe(&spi->dev, spi->irq, NULL,
  			    id->name, id->driver_data,
  			    &ad7606_spi_bops);
  }
  
  static int ad7606_spi_remove(struct spi_device *spi)
  {
  	return ad7606_remove(&spi->dev, spi->irq);
  }
  
  static const struct spi_device_id ad7606_id[] = {
  	{"ad7605-4", ID_AD7605_4},
  	{"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",
  		.pm = AD7606_PM_OPS,
  	},
  	.probe = ad7606_spi_probe,
  	.remove = ad7606_spi_remove,
  	.id_table = ad7606_id,
  };
  module_spi_driver(ad7606_driver);
  
  MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
  MODULE_LICENSE("GPL v2");
  