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/*
* AD7887 SPI ADC driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef IIO_ADC_AD7887_H_
#define IIO_ADC_AD7887_H_
#define AD7887_REF_DIS (1 << 5) /* on-chip reference disable */
#define AD7887_DUAL (1 << 4) /* dual-channel mode */
#define AD7887_CH_AIN1 (1 << 3) /* convert on channel 1, DUAL=1 */
#define AD7887_CH_AIN0 (0 << 3) /* convert on channel 0, DUAL=0,1 */
#define AD7887_PM_MODE1 (0) /* CS based shutdown */
#define AD7887_PM_MODE2 (1) /* full on */
#define AD7887_PM_MODE3 (2) /* auto shutdown after conversion */
#define AD7887_PM_MODE4 (3) /* standby mode */
enum ad7887_channels {
AD7887_CH0,
AD7887_CH0_CH1,
AD7887_CH1,
};
#define RES_MASK(bits) ((1 << (bits)) - 1) /* TODO: move this into a common header */
/*
* TODO: struct ad7887_platform_data needs to go into include/linux/iio
*/
struct ad7887_platform_data {
/* External Vref voltage applied */
u16 vref_mv;
/*
* AD7887:
* In single channel mode en_dual = flase, AIN1/Vref pins assumes its
* Vref function. In dual channel mode en_dual = true, AIN1 becomes the
* second input channel, and Vref is internally connected to Vdd.
*/
bool en_dual;
/*
* AD7887:
* use_onchip_ref = true, the Vref is internally connected to the 2.500V
* Voltage reference. If use_onchip_ref = false, the reference voltage
* is supplied by AIN1/Vref
*/
bool use_onchip_ref;
};
/**
* struct ad7887_chip_info - chip specifc information
* @int_vref_mv: the internal reference voltage
* @channel: channel specification
*/
struct ad7887_chip_info {
u16 int_vref_mv;
struct iio_chan_spec channel[3];
};
struct ad7887_state {
struct spi_device *spi;
const struct ad7887_chip_info *chip_info;
struct regulator *reg;
size_t d_size;
u16 int_vref_mv;
struct spi_transfer xfer[4];
struct spi_message msg[3];
struct spi_message *ring_msg;
unsigned char tx_cmd_buf[8];
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
unsigned char data[4] ____cacheline_aligned;
};
enum ad7887_supported_device_ids {
ID_AD7887
};
#ifdef CONFIG_IIO_BUFFER
int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad7887_ring_cleanup(struct iio_dev *indio_dev);
#else /* CONFIG_IIO_BUFFER */
static inline int
ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
return 0;
}
static inline void ad7887_ring_cleanup(struct iio_dev *indio_dev)
{
}
#endif /* CONFIG_IIO_BUFFER */
#endif /* IIO_ADC_AD7887_H_ */
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