Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2014 Angelo Compagnucci <angelo.compagnucci@gmail.com>
 *
 * Driver for Texas Instruments' ADC128S052, ADC122S021 and ADC124S021 ADC chip.
 * Datasheets can be found here:
 * https://www.ti.com/lit/ds/symlink/adc128s052.pdf
 * https://www.ti.com/lit/ds/symlink/adc122s021.pdf
 * https://www.ti.com/lit/ds/symlink/adc124s021.pdf
 */
 
#include <linux/acpi.h>
#include <linux/err.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/iio/iio.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
 
struct adc128_configuration {
<------>const struct iio_chan_spec	*channels;
<------>u8				num_channels;
};
 
struct adc128 {
<------>struct spi_device *spi;
 
<------>struct regulator *reg;
<------>struct mutex lock;
 
<------>u8 buffer[2] ____cacheline_aligned;
};
 
static int adc128_adc_conversion(struct adc128 *adc, u8 channel)
{
<------>int ret;
 
<------>mutex_lock(&adc->lock);
 
<------>adc->buffer[0] = channel << 3;
<------>adc->buffer[1] = 0;
 
<------>ret = spi_write(adc->spi, &adc->buffer, 2);
<------>if (ret < 0) {
<------><------>mutex_unlock(&adc->lock);
<------><------>return ret;
<------>}
 
<------>ret = spi_read(adc->spi, &adc->buffer, 2);
 
<------>mutex_unlock(&adc->lock);
 
<------>if (ret < 0)
<------><------>return ret;
 
<------>return ((adc->buffer[0] << 8 | adc->buffer[1]) & 0xFFF);
}
 
static int adc128_read_raw(struct iio_dev *indio_dev,
<------><------><------>   struct iio_chan_spec const *channel, int *val,
<------><------><------>   int *val2, long mask)
{
<------>struct adc128 *adc = iio_priv(indio_dev);
<------>int ret;
 
<------>switch (mask) {
<------>case IIO_CHAN_INFO_RAW:
 
<------><------>ret = adc128_adc_conversion(adc, channel->channel);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>*val = ret;
<------><------>return IIO_VAL_INT;
 
<------>case IIO_CHAN_INFO_SCALE:
 
<------><------>ret = regulator_get_voltage(adc->reg);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>*val = ret / 1000;
<------><------>*val2 = 12;
<------><------>return IIO_VAL_FRACTIONAL_LOG2;
 
<------>default:
<------><------>return -EINVAL;
<------>}
 
}
 
#define ADC128_VOLTAGE_CHANNEL(num)	\
<------>{ \
<------><------>.type = IIO_VOLTAGE, \
<------><------>.indexed = 1, \
<------><------>.channel = (num), \
<------><------>.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
<------><------>.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \
<------>}
 
static const struct iio_chan_spec adc128s052_channels[] = {
<------>ADC128_VOLTAGE_CHANNEL(0),
<------>ADC128_VOLTAGE_CHANNEL(1),
<------>ADC128_VOLTAGE_CHANNEL(2),
<------>ADC128_VOLTAGE_CHANNEL(3),
<------>ADC128_VOLTAGE_CHANNEL(4),
<------>ADC128_VOLTAGE_CHANNEL(5),
<------>ADC128_VOLTAGE_CHANNEL(6),
<------>ADC128_VOLTAGE_CHANNEL(7),
};
 
static const struct iio_chan_spec adc122s021_channels[] = {
<------>ADC128_VOLTAGE_CHANNEL(0),
<------>ADC128_VOLTAGE_CHANNEL(1),
};
 
static const struct iio_chan_spec adc124s021_channels[] = {
<------>ADC128_VOLTAGE_CHANNEL(0),
<------>ADC128_VOLTAGE_CHANNEL(1),
<------>ADC128_VOLTAGE_CHANNEL(2),
<------>ADC128_VOLTAGE_CHANNEL(3),
};
 
static const struct adc128_configuration adc128_config[] = {
<------>{ adc128s052_channels, ARRAY_SIZE(adc128s052_channels) },
<------>{ adc122s021_channels, ARRAY_SIZE(adc122s021_channels) },
<------>{ adc124s021_channels, ARRAY_SIZE(adc124s021_channels) },
};
 
static const struct iio_info adc128_info = {
<------>.read_raw = adc128_read_raw,
};
 
static int adc128_probe(struct spi_device *spi)
{
<------>struct iio_dev *indio_dev;
<------>unsigned int config;
<------>struct adc128 *adc;
<------>int ret;
 
<------>if (dev_fwnode(&spi->dev))
<------><------>config = (unsigned long) device_get_match_data(&spi->dev);
<------>else
<------><------>config = spi_get_device_id(spi)->driver_data;
 
<------>indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
<------>if (!indio_dev)
<------><------>return -ENOMEM;
 
<------>adc = iio_priv(indio_dev);
<------>adc->spi = spi;
 
<------>spi_set_drvdata(spi, indio_dev);
 
<------>indio_dev->name = spi_get_device_id(spi)->name;
<------>indio_dev->modes = INDIO_DIRECT_MODE;
<------>indio_dev->info = &adc128_info;
 
<------>indio_dev->channels = adc128_config[config].channels;
<------>indio_dev->num_channels = adc128_config[config].num_channels;
 
<------>adc->reg = devm_regulator_get(&spi->dev, "vref");
<------>if (IS_ERR(adc->reg))
<------><------>return PTR_ERR(adc->reg);
 
<------>ret = regulator_enable(adc->reg);
<------>if (ret < 0)
<------><------>return ret;
 
<------>mutex_init(&adc->lock);
 
<------>ret = iio_device_register(indio_dev);
<------>if (ret)
<------><------>goto err_disable_regulator;
 
<------>return 0;
 
err_disable_regulator:
<------>regulator_disable(adc->reg);
<------>return ret;
}
 
static int adc128_remove(struct spi_device *spi)
{
<------>struct iio_dev *indio_dev = spi_get_drvdata(spi);
<------>struct adc128 *adc = iio_priv(indio_dev);
 
<------>iio_device_unregister(indio_dev);
<------>regulator_disable(adc->reg);
 
<------>return 0;
}
 
static const struct of_device_id adc128_of_match[] = {
<------>{ .compatible = "ti,adc128s052", },
<------>{ .compatible = "ti,adc122s021", },
<------>{ .compatible = "ti,adc122s051", },
<------>{ .compatible = "ti,adc122s101", },
<------>{ .compatible = "ti,adc124s021", },
<------>{ .compatible = "ti,adc124s051", },
<------>{ .compatible = "ti,adc124s101", },
<------>{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, adc128_of_match);
 
static const struct spi_device_id adc128_id[] = {
<------>{ "adc128s052", 0 },	/* index into adc128_config */
<------>{ "adc122s021",	1 },
<------>{ "adc122s051",	1 },
<------>{ "adc122s101",	1 },
<------>{ "adc124s021", 2 },
<------>{ "adc124s051", 2 },
<------>{ "adc124s101", 2 },
<------>{ }
};
MODULE_DEVICE_TABLE(spi, adc128_id);
 
#ifdef CONFIG_ACPI
static const struct acpi_device_id adc128_acpi_match[] = {
<------>{ "AANT1280", 2 }, /* ADC124S021 compatible ACPI ID */
<------>{ }
};
MODULE_DEVICE_TABLE(acpi, adc128_acpi_match);
#endif
 
static struct spi_driver adc128_driver = {
<------>.driver = {
<------><------>.name = "adc128s052",
<------><------>.of_match_table = adc128_of_match,
<------><------>.acpi_match_table = ACPI_PTR(adc128_acpi_match),
<------>},
<------>.probe = adc128_probe,
<------>.remove = adc128_remove,
<------>.id_table = adc128_id,
};
module_spi_driver(adc128_driver);
 
MODULE_AUTHOR("Angelo Compagnucci <angelo.compagnucci@gmail.com>");
MODULE_DESCRIPTION("Texas Instruments ADC128S052");
MODULE_LICENSE("GPL v2");