// SPDX-License-Identifier: GPL-2.0-only /* * Support code for Analog Devices Sigma-Delta ADCs * * Copyright 2012 Analog Devices Inc. * Author: Lars-Peter Clausen <[email protected]> */ #include <linux/align.h> #include <linux/interrupt.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include <linux/err.h> #include <linux/module.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/adc/ad_sigma_delta.h> #include <linux/unaligned.h> #define AD_SD_COMM_CHAN_MASK … #define AD_SD_REG_COMM … #define AD_SD_REG_DATA … /** * ad_sd_set_comm() - Set communications register * * @sigma_delta: The sigma delta device * @comm: New value for the communications register */ void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm) { … } EXPORT_SYMBOL_NS_GPL(…); /** * ad_sd_write_reg() - Write a register * * @sigma_delta: The sigma delta device * @reg: Address of the register * @size: Size of the register (0-3) * @val: Value to write to the register * * Returns 0 on success, an error code otherwise. **/ int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, unsigned int size, unsigned int val) { … } EXPORT_SYMBOL_NS_GPL(…); static int ad_sd_read_reg_raw(struct ad_sigma_delta *sigma_delta, unsigned int reg, unsigned int size, uint8_t *val) { … } /** * ad_sd_read_reg() - Read a register * * @sigma_delta: The sigma delta device * @reg: Address of the register * @size: Size of the register (1-4) * @val: Read value * * Returns 0 on success, an error code otherwise. **/ int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, unsigned int size, unsigned int *val) { … } EXPORT_SYMBOL_NS_GPL(…); /** * ad_sd_reset() - Reset the serial interface * * @sigma_delta: The sigma delta device * @reset_length: Number of SCLKs with DIN = 1 * * Returns 0 on success, an error code otherwise. **/ int ad_sd_reset(struct ad_sigma_delta *sigma_delta, unsigned int reset_length) { … } EXPORT_SYMBOL_NS_GPL(…); int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta, unsigned int mode, unsigned int channel) { … } EXPORT_SYMBOL_NS_GPL(…); /** * ad_sd_calibrate_all() - Performs channel calibration * @sigma_delta: The sigma delta device * @cb: Array of channels and calibration type to perform * @n: Number of items in cb * * Returns 0 on success, an error code otherwise. **/ int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta, const struct ad_sd_calib_data *cb, unsigned int n) { … } EXPORT_SYMBOL_NS_GPL(…); /** * ad_sigma_delta_single_conversion() - Performs a single data conversion * @indio_dev: The IIO device * @chan: The conversion is done for this channel * @val: Pointer to the location where to store the read value * * Returns: 0 on success, an error value otherwise. */ int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int *val) { … } EXPORT_SYMBOL_NS_GPL(…); static int ad_sd_buffer_postenable(struct iio_dev *indio_dev) { … } static int ad_sd_buffer_postdisable(struct iio_dev *indio_dev) { … } static irqreturn_t ad_sd_trigger_handler(int irq, void *p) { … } static bool ad_sd_validate_scan_mask(struct iio_dev *indio_dev, const unsigned long *mask) { … } static const struct iio_buffer_setup_ops ad_sd_buffer_setup_ops = …; static irqreturn_t ad_sd_data_rdy_trig_poll(int irq, void *private) { … } /** * ad_sd_validate_trigger() - validate_trigger callback for ad_sigma_delta devices * @indio_dev: The IIO device * @trig: The new trigger * * Returns: 0 if the 'trig' matches the trigger registered by the ad_sigma_delta * device, -EINVAL otherwise. */ int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig) { … } EXPORT_SYMBOL_NS_GPL(…); static int devm_ad_sd_probe_trigger(struct device *dev, struct iio_dev *indio_dev) { … } /** * devm_ad_sd_setup_buffer_and_trigger() - Device-managed buffer & trigger setup * @dev: Device object to which to bind the life-time of the resources attached * @indio_dev: The IIO device */ int devm_ad_sd_setup_buffer_and_trigger(struct device *dev, struct iio_dev *indio_dev) { … } EXPORT_SYMBOL_NS_GPL(…); /** * ad_sd_init() - Initializes a ad_sigma_delta struct * @sigma_delta: The ad_sigma_delta device * @indio_dev: The IIO device which the Sigma Delta device is used for * @spi: The SPI device for the ad_sigma_delta device * @info: Device specific callbacks and options * * This function needs to be called before any other operations are performed on * the ad_sigma_delta struct. */ int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev, struct spi_device *spi, const struct ad_sigma_delta_info *info) { … } EXPORT_SYMBOL_NS_GPL(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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