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/*
* AD7298 SPI ADC driver
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#ifndef IIO_ADC_AD7298_H_
#define IIO_ADC_AD7298_H_
#define AD7298_WRITE (1 << 15) /* write to the control register */
#define AD7298_REPEAT (1 << 14) /* repeated conversion enable */
#define AD7298_CH(x) (1 << (13 - (x))) /* channel select */
#define AD7298_TSENSE (1 << 5) /* temperature conversion enable */
#define AD7298_EXTREF (1 << 2) /* external reference enable */
#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */
#define AD7298_PDD (1 << 0) /* partial power down enable */
#define AD7298_MAX_CHAN 8
#define AD7298_BITS 12
#define AD7298_STORAGE_BITS 16
#define AD7298_INTREF_mV 2500
#define AD7298_CH_TEMP 9
#define RES_MASK(bits) ((1 << (bits)) - 1)
/*
* TODO: struct ad7298_platform_data needs to go into include/linux/iio
*/
struct ad7298_platform_data {
/* External Vref voltage applied */
u16 vref_mv;
};
struct ad7298_state {
struct spi_device *spi;
struct regulator *reg;
u16 int_vref_mv;
unsigned ext_ref;
struct spi_transfer ring_xfer[10];
struct spi_transfer scan_single_xfer[3];
struct spi_message ring_msg;
struct spi_message scan_single_msg;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
unsigned short rx_buf[8] ____cacheline_aligned;
unsigned short tx_buf[2];
};
#ifdef CONFIG_IIO_BUFFER
int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad7298_ring_cleanup(struct iio_dev *indio_dev);
#else /* CONFIG_IIO_BUFFER */
static inline int
ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
return 0;
}
static inline void ad7298_ring_cleanup(struct iio_dev *indio_dev)
{
}
#endif /* CONFIG_IIO_BUFFER */
#endif /* IIO_ADC_AD7298_H_ */
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