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/*
* AD7606 ADC driver
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#ifndef IIO_ADC_AD7606_H_
#define IIO_ADC_AD7606_H_
/*
* TODO: struct ad7606_platform_data needs to go into include/linux/iio
*/
/**
* struct ad7606_platform_data - platform/board specifc information
* @default_os: default oversampling value {0, 2, 4, 8, 16, 32, 64}
* @default_range: default range +/-{5000, 10000} mVolt
* @gpio_convst: number of gpio connected to the CONVST pin
* @gpio_reset: gpio connected to the RESET pin, if not used set to -1
* @gpio_range: gpio connected to the RANGE pin, if not used set to -1
* @gpio_os0: gpio connected to the OS0 pin, if not used set to -1
* @gpio_os1: gpio connected to the OS1 pin, if not used set to -1
* @gpio_os2: gpio connected to the OS2 pin, if not used set to -1
* @gpio_frstdata: gpio connected to the FRSTDAT pin, if not used set to -1
* @gpio_stby: gpio connected to the STBY pin, if not used set to -1
*/
struct ad7606_platform_data {
unsigned default_os;
unsigned default_range;
unsigned gpio_convst;
unsigned gpio_reset;
unsigned gpio_range;
unsigned gpio_os0;
unsigned gpio_os1;
unsigned gpio_os2;
unsigned gpio_frstdata;
unsigned gpio_stby;
};
/**
* struct ad7606_chip_info - chip specifc information
* @name: indentification string for chip
* @int_vref_mv: the internal reference voltage
* @channels: channel specification
* @num_channels: number of channels
*/
struct ad7606_chip_info {
const char *name;
u8 bits;
char sign;
u16 int_vref_mv;
struct iio_chan_spec *channels;
unsigned num_channels;
};
/**
* struct ad7606_state - driver instance specific data
*/
struct ad7606_state {
struct device *dev;
const struct ad7606_chip_info *chip_info;
struct ad7606_platform_data *pdata;
struct regulator *reg;
struct work_struct poll_work;
wait_queue_head_t wq_data_avail;
size_t d_size;
const struct ad7606_bus_ops *bops;
int irq;
unsigned id;
unsigned range;
unsigned oversampling;
bool done;
bool have_frstdata;
bool have_os;
bool have_stby;
bool have_reset;
bool have_range;
void __iomem *base_address;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
unsigned short data[8] ____cacheline_aligned;
};
struct ad7606_bus_ops {
/* more methods added in future? */
int (*read_block)(struct device *, int, void *);
};
void ad7606_suspend(struct iio_dev *indio_dev);
void ad7606_resume(struct iio_dev *indio_dev);
struct iio_dev *ad7606_probe(struct device *dev, int irq,
void __iomem *base_address, unsigned id,
const struct ad7606_bus_ops *bops);
int ad7606_remove(struct iio_dev *indio_dev);
int ad7606_reset(struct ad7606_state *st);
enum ad7606_supported_device_ids {
ID_AD7606_8,
ID_AD7606_6,
ID_AD7606_4
};
int ad7606_scan_from_ring(struct iio_dev *indio_dev, unsigned ch);
int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad7606_ring_cleanup(struct iio_dev *indio_dev);
#endif /* IIO_ADC_AD7606_H_ */
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