2 * AD7298 SPI ADC driver
4 * Copyright 2011 Analog Devices Inc.
6 * Licensed under the GPL-2.
9 #ifndef IIO_ADC_AD7298_H_
10 #define IIO_ADC_AD7298_H_
12 #define AD7298_WRITE (1 << 15) /* write to the control register */
13 #define AD7298_REPEAT (1 << 14) /* repeated conversion enable */
14 #define AD7298_CH(x) (1 << (13 - (x))) /* channel select */
15 #define AD7298_TSENSE (1 << 5) /* temperature conversion enable */
16 #define AD7298_EXTREF (1 << 2) /* external reference enable */
17 #define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */
18 #define AD7298_PDD (1 << 0) /* partial power down enable */
20 #define AD7298_MAX_CHAN 8
21 #define AD7298_BITS 12
22 #define AD7298_STORAGE_BITS 16
23 #define AD7298_INTREF_mV 2500
25 #define AD7298_CH_TEMP 9
27 #define RES_MASK(bits) ((1 << (bits)) - 1)
30 * TODO: struct ad7298_platform_data needs to go into include/linux/iio
33 struct ad7298_platform_data {
34 /* External Vref voltage applied */
39 struct spi_device *spi;
40 struct regulator *reg;
43 struct spi_transfer ring_xfer[10];
44 struct spi_transfer scan_single_xfer[3];
45 struct spi_message ring_msg;
46 struct spi_message scan_single_msg;
48 * DMA (thus cache coherency maintenance) requires the
49 * transfer buffers to live in their own cache lines.
51 unsigned short rx_buf[8] ____cacheline_aligned;
52 unsigned short tx_buf[2];
55 #ifdef CONFIG_IIO_BUFFER
56 int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev);
57 void ad7298_ring_cleanup(struct iio_dev *indio_dev);
58 #else /* CONFIG_IIO_BUFFER */
61 ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
66 static inline void ad7298_ring_cleanup(struct iio_dev *indio_dev)
69 #endif /* CONFIG_IIO_BUFFER */
70 #endif /* IIO_ADC_AD7298_H_ */