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