Release 4.7 drivers/staging/iio/adc/ad7606.h

/*
 * 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 specific 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 int			default_os;
	
unsigned int			default_range;
	
unsigned int			gpio_convst;
	
unsigned int			gpio_reset;
	
unsigned int			gpio_range;
	
unsigned int			gpio_os0;
	
unsigned int			gpio_os1;
	
unsigned int			gpio_os2;
	
unsigned int			gpio_frstdata;
	
unsigned int			gpio_stby;
};

/**
 * struct ad7606_chip_info - chip specific information
 * @name:               identification 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;
	
u16				int_vref_mv;
	
const struct iio_chan_spec	*channels;
	
unsigned int			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;
	
const struct ad7606_bus_ops	*bops;
	
unsigned int			range;
	
unsigned int			oversampling;
	
bool				done;
	
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 *);
};

struct iio_dev *ad7606_probe(struct device *dev, int irq,
			      void __iomem *base_address, unsigned int id,
			      const struct ad7606_bus_ops *bops);
int ad7606_remove(struct iio_dev *indio_dev, int irq);
int ad7606_reset(struct ad7606_state *st);


enum ad7606_supported_device_ids {
	
ID_AD7606_8,
	
ID_AD7606_6,
	
ID_AD7606_4
};

int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad7606_ring_cleanup(struct iio_dev *indio_dev);

#ifdef CONFIG_PM_SLEEP
extern const struct dev_pm_ops ad7606_pm_ops;

#define AD7606_PM_OPS (&ad7606_pm_ops)
#else

#define AD7606_PM_OPS NULL
#endif

#endif /* IIO_ADC_AD7606_H_ */
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Directory: drivers/staging/iio/adc

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