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// SPDX-License-Identifier: GPL-2.0
/*
* AD7606 Parallel Interface ADC driver
*
* Copyright 2011 - 2024 Analog Devices Inc.
* Copyright 2024 BayLibre SAS.
*/
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/types.h>
#include <linux/iio/backend.h>
#include <linux/iio/iio.h>
#include "ad7606.h"
static const struct iio_chan_spec ad7606b_bi_channels[] = {
AD7606_BI_CHANNEL(0),
AD7606_BI_CHANNEL(1),
AD7606_BI_CHANNEL(2),
AD7606_BI_CHANNEL(3),
AD7606_BI_CHANNEL(4),
AD7606_BI_CHANNEL(5),
AD7606_BI_CHANNEL(6),
AD7606_BI_CHANNEL(7),
};
static int ad7606_bi_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
unsigned int c, ret;
for (c = 0; c < indio_dev->num_channels; c++) {
if (test_bit(c, scan_mask))
ret = iio_backend_chan_enable(st->back, c);
else
ret = iio_backend_chan_disable(st->back, c);
if (ret)
return ret;
}
return 0;
}
static int ad7606_bi_setup_iio_backend(struct device *dev, struct iio_dev *indio_dev)
{
struct ad7606_state *st = iio_priv(indio_dev);
unsigned int ret, c;
struct iio_backend_data_fmt data = {
.sign_extend = true,
.enable = true,
};
st->back = devm_iio_backend_get(dev, NULL);
if (IS_ERR(st->back))
return PTR_ERR(st->back);
/* If the device is iio_backend powered the PWM is mandatory */
if (!st->cnvst_pwm)
return dev_err_probe(st->dev, -EINVAL,
"A PWM is mandatory when using backend.\n");
ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev);
if (ret)
return ret;
ret = devm_iio_backend_enable(dev, st->back);
if (ret)
return ret;
for (c = 0; c < indio_dev->num_channels; c++) {
ret = iio_backend_data_format_set(st->back, c, &data);
if (ret)
return ret;
}
indio_dev->channels = ad7606b_bi_channels;
indio_dev->num_channels = 8;
return 0;
}
static const struct ad7606_bus_ops ad7606_bi_bops = {
.iio_backend_config = ad7606_bi_setup_iio_backend,
.update_scan_mode = ad7606_bi_update_scan_mode,
};
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 ad7606_chip_info *chip_info;
const struct platform_device_id *id;
struct resource *res;
void __iomem *addr;
resource_size_t remap_size;
int irq;
/*
* If a firmware node is available (ACPI or DT), platform_device_id is null
* and we must use get_match_data.
*/
if (dev_fwnode(&pdev->dev)) {
chip_info = device_get_match_data(&pdev->dev);
if (device_property_present(&pdev->dev, "io-backends"))
/*
* If a backend is available ,call the core probe with backend
* bops, otherwise use the former bops.
*/
return ad7606_probe(&pdev->dev, 0, NULL,
chip_info,
&ad7606_bi_bops);
} else {
id = platform_get_device_id(pdev);
chip_info = (const struct ad7606_chip_info *)id->driver_data;
}
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, chip_info,
remap_size > 1 ? &ad7606_par16_bops :
&ad7606_par8_bops);
}
static const struct platform_device_id ad7606_driver_ids[] = {
{ .name = "ad7605-4", .driver_data = (kernel_ulong_t)&ad7605_4_info, },
{ .name = "ad7606-4", .driver_data = (kernel_ulong_t)&ad7606_4_info, },
{ .name = "ad7606-6", .driver_data = (kernel_ulong_t)&ad7606_6_info, },
{ .name = "ad7606-8", .driver_data = (kernel_ulong_t)&ad7606_8_info, },
{ .name = "ad7606b", .driver_data = (kernel_ulong_t)&ad7606b_info, },
{ .name = "ad7607", .driver_data = (kernel_ulong_t)&ad7607_info, },
{ .name = "ad7608", .driver_data = (kernel_ulong_t)&ad7608_info, },
{ .name = "ad7609", .driver_data = (kernel_ulong_t)&ad7609_info, },
{ }
};
MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
static const struct of_device_id ad7606_of_match[] = {
{ .compatible = "adi,ad7605-4", .data = &ad7605_4_info },
{ .compatible = "adi,ad7606-4", .data = &ad7606_4_info },
{ .compatible = "adi,ad7606-6", .data = &ad7606_6_info },
{ .compatible = "adi,ad7606-8", .data = &ad7606_8_info },
{ .compatible = "adi,ad7606b", .data = &ad7606b_info },
{ .compatible = "adi,ad7607", .data = &ad7607_info },
{ .compatible = "adi,ad7608", .data = &ad7608_info },
{ .compatible = "adi,ad7609", .data = &ad7609_info },
{ }
};
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 <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_AD7606);
MODULE_IMPORT_NS(IIO_BACKEND);
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