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_BUFFER
53 int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev);
54 void ad7476_ring_cleanup(struct iio_dev *indio_dev);
55 #else /* CONFIG_IIO_BUFFER */
56 
57 static inline int
ad7476_register_ring_funcs_and_init(struct iio_dev * indio_dev)58 ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
59 {
60 	return 0;
61 }
62 
ad7476_ring_cleanup(struct iio_dev * indio_dev)63 static inline void ad7476_ring_cleanup(struct iio_dev *indio_dev)
64 {
65 }
66 #endif /* CONFIG_IIO_BUFFER */
67 #endif /* IIO_ADC_AD7476_H_ */
68