drivers/staging/iio/adc/ad7780.h

   1 /*
   2  * AD7780/AD7781 SPI ADC driver
   3  *
   4  * Copyright 2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8 #ifndef IIO_ADC_AD7780_H_
   9 #define IIO_ADC_AD7780_H_
  10
  11 /*
  12  * TODO: struct ad7780_platform_data needs to go into include/linux/iio
  13  */
  14
  15 /* NOTE:
  16  * The AD7780 doesn't feature a dedicated SPI chip select, in addition it
  17  * features a dual use data out ready DOUT/RDY output.
  18  * In order to avoid contentions on the SPI bus, it's therefore necessary
  19  * to use spi bus locking combined with a dedicated GPIO to control the
  20  * power down reset signal of the AD7780.
  21  *
  22  * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
  23  */
  24
  25 struct ad7780_platform_data {
  26         u16                             vref_mv;
  27         int                             gpio_pdrst;
  28 };
  29
  30 #endif /* IIO_ADC_AD7780_H_ */