130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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#ifndef IIO_ADC_AD7606_H_
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#define IIO_ADC_AD7606_H_
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/**
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* struct ad7606_chip_info - chip specific information
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* @channels: channel specification
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* @num_channels: number of channels
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* @oversampling_avail pointer to the array which stores the available
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* oversampling ratios.
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* @oversampling_num number of elements stored in oversampling_avail array
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* @os_req_reset some devices require a reset to update oversampling
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* @write_scale_sw pointer to the function which writes the scale via spi
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in software mode
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* @write_os_sw pointer to the function which writes the os via spi
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in software mode
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* @sw_mode_config: pointer to a function which configured the device
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* for software mode
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*/
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struct ad7606_chip_info {
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const struct iio_chan_spec *channels;
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unsigned int num_channels;
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const unsigned int *oversampling_avail;
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unsigned int oversampling_num;
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bool os_req_reset;
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int (*write_scale_sw)(struct iio_dev *indio_dev, int ch, int val);
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int (*write_os_sw)(struct iio_dev *indio_dev, int val);
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int (*sw_mode_config)(struct iio_dev *indio_dev);
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};
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/**
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* struct ad7606_state - driver instance specific data
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* @dev pointer to kernel device
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* @chip_info entry in the table of chips that describes this device
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* @reg regulator info for the the power supply of the device
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* @bops bus operations (SPI or parallel)
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* @range voltage range selection, selects which scale to apply
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* @oversampling oversampling selection
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* @base_address address from where to read data in parallel operation
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* @sw_mode_en software mode enabled
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* @scale_avail pointer to the array which stores the available scales
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* @num_scales number of elements stored in the scale_avail array
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* @oversampling_avail pointer to the array which stores the available
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* oversampling ratios.
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* @num_os_ratios number of elements stored in oversampling_avail array
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* @write_scale pointer to the function which writes the scale
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* @write_os pointer to the function which writes the os
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* @lock protect sensor state from concurrent accesses to GPIOs
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* @gpio_convst GPIO descriptor for conversion start signal (CONVST)
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* @gpio_reset GPIO descriptor for device hard-reset
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* @gpio_range GPIO descriptor for range selection
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* @gpio_standby GPIO descriptor for stand-by signal (STBY),
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* controls power-down mode of device
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* @gpio_frstdata GPIO descriptor for reading from device when data
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* is being read on the first channel
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* @gpio_os GPIO descriptors to control oversampling on the device
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* @complete completion to indicate end of conversion
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* @trig The IIO trigger associated with the device.
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* @data buffer for reading data from the device
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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 regulator *reg;
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const struct ad7606_bus_ops *bops;
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unsigned int range[16];
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unsigned int oversampling;
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void __iomem *base_address;
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bool sw_mode_en;
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const unsigned int *scale_avail;
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unsigned int num_scales;
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const unsigned int *oversampling_avail;
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unsigned int num_os_ratios;
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int (*write_scale)(struct iio_dev *indio_dev, int ch, int val);
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int (*write_os)(struct iio_dev *indio_dev, int val);
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struct mutex lock; /* protect sensor state */
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struct gpio_desc *gpio_convst;
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struct gpio_desc *gpio_reset;
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struct gpio_desc *gpio_range;
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struct gpio_desc *gpio_standby;
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struct gpio_desc *gpio_frstdata;
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struct gpio_descs *gpio_os;
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struct iio_trigger *trig;
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struct completion completion;
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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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* 16 * 16-bit samples + 64-bit timestamp
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*/
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unsigned short data[20] ____cacheline_aligned;
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};
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/**
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* struct ad7606_bus_ops - driver bus operations
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* @read_block function pointer for reading blocks of data
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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 *dev, int num, void *data);
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};
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int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
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const char *name, unsigned int id,
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const struct ad7606_bus_ops *bops);
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enum ad7606_supported_device_ids {
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ID_AD7605_4,
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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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ID_AD7616,
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};
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#ifdef CONFIG_PM_SLEEP
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extern const struct dev_pm_ops ad7606_pm_ops;
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#define AD7606_PM_OPS (&ad7606_pm_ops)
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#else
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#define AD7606_PM_OPS NULL
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#endif
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#endif /* IIO_ADC_AD7606_H_ */
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