linux/drivers/iio/adc/lpc18xx_adc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * IIO ADC driver for NXP LPC18xx ADC
 *
 * Copyright (C) 2016 Joachim Eastwood <[email protected]>
 *
 * UNSUPPORTED hardware features:
 *  - Hardware triggers
 *  - Burst mode
 *  - Interrupts
 *  - DMA
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/iio/iio.h>
#include <linux/iio/driver.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>

/* LPC18XX ADC registers and bits */
#define LPC18XX_ADC_CR …
#define LPC18XX_ADC_CR_CLKDIV_SHIFT …
#define LPC18XX_ADC_CR_PDN …
#define LPC18XX_ADC_CR_START_NOW …
#define LPC18XX_ADC_GDR …

/* Data register bits */
#define LPC18XX_ADC_SAMPLE_SHIFT …
#define LPC18XX_ADC_SAMPLE_MASK …
#define LPC18XX_ADC_CONV_DONE …

/* Clock should be 4.5 MHz or less */
#define LPC18XX_ADC_CLK_TARGET …

struct lpc18xx_adc { … };

#define LPC18XX_ADC_CHAN(_idx) …

static const struct iio_chan_spec lpc18xx_adc_iio_channels[] = …;

static int lpc18xx_adc_read_chan(struct lpc18xx_adc *adc, unsigned int ch)
{ … }

static int lpc18xx_adc_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{ … }

static const struct iio_info lpc18xx_adc_info = …;

static void lpc18xx_clear_cr_reg(void *data)
{ … }

static void lpc18xx_regulator_disable(void *vref)
{ … }

static int lpc18xx_adc_probe(struct platform_device *pdev)
{ … }

static const struct of_device_id lpc18xx_adc_match[] = …;
MODULE_DEVICE_TABLE(of, lpc18xx_adc_match);

static struct platform_driver lpc18xx_adc_driver = …;
module_platform_driver(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;