// SPDX-License-Identifier: GPL-2.0 /* * This file is the ADC part of the STM32 DFSDM driver * * Copyright (C) 2017, STMicroelectronics - All Rights Reserved * Author: Arnaud Pouliquen <[email protected]>. */ #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/iio/adc/stm32-dfsdm-adc.h> #include <linux/iio/backend.h> #include <linux/iio/buffer.h> #include <linux/iio/hw-consumer.h> #include <linux/iio/sysfs.h> #include <linux/iio/timer/stm32-lptim-trigger.h> #include <linux/iio/timer/stm32-timer-trigger.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> #include "stm32-dfsdm.h" #define DFSDM_DMA_BUFFER_SIZE … /* Conversion timeout */ #define DFSDM_TIMEOUT_US … #define DFSDM_TIMEOUT … /* Oversampling attribute default */ #define DFSDM_DEFAULT_OVERSAMPLING … /* Oversampling max values */ #define DFSDM_MAX_INT_OVERSAMPLING … #define DFSDM_MAX_FL_OVERSAMPLING … /* Limit filter output resolution to 31 bits. (i.e. sample range is +/-2^30) */ #define DFSDM_DATA_MAX … /* * Data are output as two's complement data in a 24 bit field. * Data from filters are in the range +/-2^(n-1) * 2^(n-1) maximum positive value cannot be coded in 2's complement n bits * An extra bit is required to avoid wrap-around of the binary code for 2^(n-1) * So, the resolution of samples from filter is actually limited to 23 bits */ #define DFSDM_DATA_RES … /* Filter configuration */ #define DFSDM_CR1_CFG_MASK … enum sd_converter_type { … }; struct stm32_dfsdm_dev_data { … }; struct stm32_dfsdm_adc { … }; struct stm32_dfsdm_str2field { … }; /* DFSDM channel serial interface type */ static const struct stm32_dfsdm_str2field stm32_dfsdm_chan_type[] = …; /* DFSDM channel clock source */ static const struct stm32_dfsdm_str2field stm32_dfsdm_chan_src[] = …; static int stm32_dfsdm_str2val(const char *str, const struct stm32_dfsdm_str2field *list) { … } /** * struct stm32_dfsdm_trig_info - DFSDM trigger info * @name: name of the trigger, corresponding to its source * @jextsel: trigger signal selection */ struct stm32_dfsdm_trig_info { … }; /* hardware injected trigger enable, edge selection */ enum stm32_dfsdm_jexten { … }; static const struct stm32_dfsdm_trig_info stm32_dfsdm_trigs[] = …; static int stm32_dfsdm_get_jextsel(struct iio_dev *indio_dev, struct iio_trigger *trig) { … } static int stm32_dfsdm_compute_osrs(struct stm32_dfsdm_filter *fl, unsigned int fast, unsigned int oversamp) { … } static int stm32_dfsdm_compute_all_osrs(struct iio_dev *indio_dev, unsigned int oversamp) { … } static int stm32_dfsdm_start_channel(struct iio_dev *indio_dev) { … } static void stm32_dfsdm_stop_channel(struct iio_dev *indio_dev) { … } static int stm32_dfsdm_chan_configure(struct stm32_dfsdm *dfsdm, struct stm32_dfsdm_channel *ch) { … } static int stm32_dfsdm_start_filter(struct stm32_dfsdm_adc *adc, unsigned int fl_id, struct iio_trigger *trig) { … } static void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm, unsigned int fl_id) { … } static int stm32_dfsdm_filter_set_trig(struct iio_dev *indio_dev, unsigned int fl_id, struct iio_trigger *trig) { … } static int stm32_dfsdm_channels_configure(struct iio_dev *indio_dev, unsigned int fl_id, struct iio_trigger *trig) { … } static int stm32_dfsdm_filter_configure(struct iio_dev *indio_dev, unsigned int fl_id, struct iio_trigger *trig) { … } static int stm32_dfsdm_channel_parse_of(struct stm32_dfsdm *dfsdm, struct iio_dev *indio_dev, struct iio_chan_spec *ch) { … } static int stm32_dfsdm_generic_channel_parse_of(struct stm32_dfsdm *dfsdm, struct iio_dev *indio_dev, struct iio_chan_spec *ch, struct fwnode_handle *node) { … } static ssize_t dfsdm_adc_audio_get_spiclk(struct iio_dev *indio_dev, uintptr_t priv, const struct iio_chan_spec *chan, char *buf) { … } static int dfsdm_adc_set_samp_freq(struct iio_dev *indio_dev, unsigned int sample_freq, unsigned int spi_freq) { … } static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev, uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static int stm32_dfsdm_start_conv(struct iio_dev *indio_dev, struct iio_trigger *trig) { … } static void stm32_dfsdm_stop_conv(struct iio_dev *indio_dev) { … } static int stm32_dfsdm_set_watermark(struct iio_dev *indio_dev, unsigned int val) { … } static unsigned int stm32_dfsdm_adc_dma_residue(struct stm32_dfsdm_adc *adc) { … } static inline void stm32_dfsdm_process_data(struct stm32_dfsdm_adc *adc, s32 *buffer) { … } static void stm32_dfsdm_dma_buffer_done(void *data) { … } static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev) { … } static void stm32_dfsdm_adc_dma_stop(struct iio_dev *indio_dev) { … } static int stm32_dfsdm_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { … } static int stm32_dfsdm_postenable(struct iio_dev *indio_dev) { … } static int stm32_dfsdm_predisable(struct iio_dev *indio_dev) { … } static const struct iio_buffer_setup_ops stm32_dfsdm_buffer_setup_ops = …; /** * stm32_dfsdm_get_buff_cb() - register a callback that will be called when * DMA transfer period is achieved. * * @iio_dev: Handle to IIO device. * @cb: Pointer to callback function: * - data: pointer to data buffer * - size: size in byte of the data buffer * - private: pointer to consumer private structure. * @private: Pointer to consumer private structure. */ int stm32_dfsdm_get_buff_cb(struct iio_dev *iio_dev, int (*cb)(const void *data, size_t size, void *private), void *private) { … } EXPORT_SYMBOL_GPL(…); /** * stm32_dfsdm_release_buff_cb - unregister buffer callback * * @iio_dev: Handle to IIO device. */ int stm32_dfsdm_release_buff_cb(struct iio_dev *iio_dev) { … } EXPORT_SYMBOL_GPL(…); static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int *res) { … } static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int stm32_dfsdm_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig) { … } static const struct iio_info stm32_dfsdm_info_audio = …; static const struct iio_info stm32_dfsdm_info_adc = …; static irqreturn_t stm32_dfsdm_irq(int irq, void *arg) { … } /* * Define external info for SPI Frequency and audio sampling rate that can be * configured by ASoC driver through consumer.h API */ static const struct iio_chan_spec_ext_info dfsdm_adc_audio_ext_info[] = …; static void stm32_dfsdm_dma_release(struct iio_dev *indio_dev) { … } static int stm32_dfsdm_dma_request(struct device *dev, struct iio_dev *indio_dev) { … } static int stm32_dfsdm_adc_chan_init_one(struct iio_dev *indio_dev, struct iio_chan_spec *ch, struct fwnode_handle *child) { … } static int stm32_dfsdm_chan_init(struct iio_dev *indio_dev, struct iio_chan_spec *channels) { … } static int stm32_dfsdm_generic_chan_init(struct iio_dev *indio_dev, struct iio_chan_spec *channels) { … } static int stm32_dfsdm_audio_init(struct device *dev, struct iio_dev *indio_dev) { … } static int stm32_dfsdm_adc_init(struct device *dev, struct iio_dev *indio_dev) { … } static const struct stm32_dfsdm_dev_data stm32h7_dfsdm_adc_data = …; static const struct stm32_dfsdm_dev_data stm32h7_dfsdm_audio_data = …; static const struct of_device_id stm32_dfsdm_adc_match[] = …; MODULE_DEVICE_TABLE(of, stm32_dfsdm_adc_match); static int stm32_dfsdm_adc_probe(struct platform_device *pdev) { … } static void stm32_dfsdm_adc_remove(struct platform_device *pdev) { … } static int stm32_dfsdm_adc_suspend(struct device *dev) { … } static int stm32_dfsdm_adc_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(stm32_dfsdm_adc_pm_ops, stm32_dfsdm_adc_suspend, stm32_dfsdm_adc_resume); static struct platform_driver stm32_dfsdm_adc_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_IMPORT_NS(…);
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