drivers/staging/iio/adc/ad7476.h

   1 /*
   2  * AD7476/5/7/8 (A) SPI ADC driver
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8 #ifndef IIO_ADC_AD7476_H_
   9 #define IIO_ADC_AD7476_H_
  10
  11 #define RES_MASK(bits)  ((1 << (bits)) - 1)
  12
  13 /*
  14  * TODO: struct ad7476_platform_data needs to go into include/linux/iio
  15  */
  16
  17 struct ad7476_platform_data {
  18         u16                             vref_mv;
  19 };
  20
  21 struct ad7476_chip_info {
  22         u16                             int_vref_mv;
  23         struct iio_chan_spec            channel[2];
  24 };
  25
  26 struct ad7476_state {
  27         struct spi_device               *spi;
  28         const struct ad7476_chip_info   *chip_info;
  29         struct regulator                *reg;
  30         size_t                          d_size;
  31         u16                             int_vref_mv;
  32         struct spi_transfer             xfer;
  33         struct spi_message              msg;
  34         /*
  35          * DMA (thus cache coherency maintenance) requires the
  36          * transfer buffers to live in their own cache lines.
  37          */
  38         unsigned char                   data[2] ____cacheline_aligned;
  39 };
  40
  41 enum ad7476_supported_device_ids {
  42         ID_AD7466,
  43         ID_AD7467,
  44         ID_AD7468,
  45         ID_AD7475,
  46         ID_AD7476,
  47         ID_AD7477,
  48         ID_AD7478,
  49         ID_AD7495
  50 };
  51
  52 #ifdef CONFIG_IIO_RING_BUFFER
  53 int ad7476_scan_from_ring(struct iio_dev *indio_dev);
  54 int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev);
  55 void ad7476_ring_cleanup(struct iio_dev *indio_dev);
  56 #else /* CONFIG_IIO_RING_BUFFER */
  57 static inline int ad7476_scan_from_ring(struct iio_dev *indio_dev)
  58 {
  59         return 0;
  60 }
  61
  62 static inline int
  63 ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
  64 {
  65         return 0;
  66 }
  67
  68 static inline void ad7476_ring_cleanup(struct iio_dev *indio_dev)
  69 {
  70 }
  71 #endif /* CONFIG_IIO_RING_BUFFER */
  72 #endif /* IIO_ADC_AD7476_H_ */