// SPDX-License-Identifier: GPL-2.0
/*
* AD7606 Parallel Interface ADC driver
*
* Copyright 2011 Analog Devices Inc.
*/
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iio/iio.h>
#include "ad7606.h"
static int ad7606_par16_read_block(struct device *dev,
int count, void *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad7606_state *st = iio_priv(indio_dev);
/*
* On the parallel interface, the frstdata signal is set to high while
* and after reading the sample of the first channel and low for all
* other channels. This can be used to check that the incoming data is
* correctly aligned. During normal operation the data should never
* become unaligned, but some glitch or electrostatic discharge might
* cause an extra read or clock cycle. Monitoring the frstdata signal
* allows to recover from such failure situations.
*/
int num = count;
u16 *_buf = buf;
if (st->gpio_frstdata) {
insw((unsigned long)st->base_address, _buf, 1);
if (!gpiod_get_value(st->gpio_frstdata)) {
ad7606_reset(st);
return -EIO;
}
_buf++;
num--;
}
insw((unsigned long)st->base_address, _buf, num);
return 0;
}
static const struct ad7606_bus_ops ad7606_par16_bops = {
.read_block = ad7606_par16_read_block,
};
static int ad7606_par8_read_block(struct device *dev,
int count, void *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad7606_state *st = iio_priv(indio_dev);
/*
* On the parallel interface, the frstdata signal is set to high while
* and after reading the sample of the first channel and low for all
* other channels. This can be used to check that the incoming data is
* correctly aligned. During normal operation the data should never
* become unaligned, but some glitch or electrostatic discharge might
* cause an extra read or clock cycle. Monitoring the frstdata signal
* allows to recover from such failure situations.
*/
int num = count;
u16 *_buf = buf;
if (st->gpio_frstdata) {
insb((unsigned long)st->base_address, _buf, 2);
if (!gpiod_get_value(st->gpio_frstdata)) {
ad7606_reset(st);
return -EIO;
}
_buf++;
num--;
}
insb((unsigned long)st->base_address, _buf, num * 2);
return 0;
}
static const struct ad7606_bus_ops ad7606_par8_bops = {
.read_block = ad7606_par8_read_block,
};
static int ad7606_par_probe(struct platform_device *pdev)
{
const struct platform_device_id *id = platform_get_device_id(pdev);
struct resource *res;
void __iomem *addr;
resource_size_t remap_size;
int irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(addr))
return PTR_ERR(addr);
remap_size = resource_size(res);
return ad7606_probe(&pdev->dev, irq, addr,
id->name, id->driver_data,
remap_size > 1 ? &ad7606_par16_bops :
&ad7606_par8_bops);
}
static const struct platform_device_id ad7606_driver_ids[] = {
{ .name = "ad7605-4", .driver_data = ID_AD7605_4, },
{ .name = "ad7606-4", .driver_data = ID_AD7606_4, },
{ .name = "ad7606-6", .driver_data = ID_AD7606_6, },
{ .name = "ad7606-8", .driver_data = ID_AD7606_8, },
{ }
};
MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
static const struct of_device_id ad7606_of_match[] = {
{ .compatible = "adi,ad7605-4" },
{ .compatible = "adi,ad7606-4" },
{ .compatible = "adi,ad7606-6" },
{ .compatible = "adi,ad7606-8" },
{ }
};
MODULE_DEVICE_TABLE(of, ad7606_of_match);
static struct platform_driver ad7606_driver = {
.probe = ad7606_par_probe,
.id_table = ad7606_driver_ids,
.driver = {
.name = "ad7606",
.pm = AD7606_PM_OPS,
.of_match_table = ad7606_of_match,
},
};
module_platform_driver(ad7606_driver);
MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_AD7606);
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