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/* SPDX-License-Identifier: GPL-2.0 */
/*
* AD7606 ADC driver
*
* Copyright 2011 Analog Devices Inc.
*/
#ifndef IIO_ADC_AD7606_H_
#define IIO_ADC_AD7606_H_
/**
* struct ad7606_chip_info - chip specific information
* @channels: channel specification
* @num_channels: number of channels
* @oversampling_avail pointer to the array which stores the available
* oversampling ratios.
* @oversampling_num number of elements stored in oversampling_avail array
* @os_req_reset some devices require a reset to update oversampling
*/
struct ad7606_chip_info {
const struct iio_chan_spec *channels;
unsigned int num_channels;
const unsigned int *oversampling_avail;
unsigned int oversampling_num;
bool os_req_reset;
};
/**
* struct ad7606_state - driver instance specific data
* @dev pointer to kernel device
* @chip_info entry in the table of chips that describes this device
* @reg regulator info for the the power supply of the device
* @bops bus operations (SPI or parallel)
* @range voltage range selection, selects which scale to apply
* @oversampling oversampling selection
* @base_address address from where to read data in parallel operation
* @scale_avail pointer to the array which stores the available scales
* @num_scales number of elements stored in the scale_avail array
* @oversampling_avail pointer to the array which stores the available
* oversampling ratios.
* @num_os_ratios number of elements stored in oversampling_avail array
* @lock protect sensor state from concurrent accesses to GPIOs
* @gpio_convst GPIO descriptor for conversion start signal (CONVST)
* @gpio_reset GPIO descriptor for device hard-reset
* @gpio_range GPIO descriptor for range selection
* @gpio_standby GPIO descriptor for stand-by signal (STBY),
* controls power-down mode of device
* @gpio_frstdata GPIO descriptor for reading from device when data
* is being read on the first channel
* @gpio_os GPIO descriptors to control oversampling on the device
* @complete completion to indicate end of conversion
* @trig The IIO trigger associated with the device.
* @data buffer for reading data from the device
*/
struct ad7606_state {
struct device *dev;
const struct ad7606_chip_info *chip_info;
struct regulator *reg;
const struct ad7606_bus_ops *bops;
unsigned int range;
unsigned int oversampling;
void __iomem *base_address;
const unsigned int *scale_avail;
unsigned int num_scales;
const unsigned int *oversampling_avail;
unsigned int num_os_ratios;
struct mutex lock; /* protect sensor state */
struct gpio_desc *gpio_convst;
struct gpio_desc *gpio_reset;
struct gpio_desc *gpio_range;
struct gpio_desc *gpio_standby;
struct gpio_desc *gpio_frstdata;
struct gpio_descs *gpio_os;
struct iio_trigger *trig;
struct completion completion;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
* 16 * 16-bit samples + 64-bit timestamp
*/
unsigned short data[20] ____cacheline_aligned;
};
/**
* struct ad7606_bus_ops - driver bus operations
* @read_block function pointer for reading blocks of data
*/
struct ad7606_bus_ops {
/* more methods added in future? */
int (*read_block)(struct device *dev, int num, void *data);
};
int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
const char *name, unsigned int id,
const struct ad7606_bus_ops *bops);
enum ad7606_supported_device_ids {
ID_AD7605_4,
ID_AD7606_8,
ID_AD7606_6,
ID_AD7606_4,
ID_AD7616,
};
#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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