drivers/iio/adc/ad7606_par.c - linux - Git at Google

 // 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"
 #include "ad7606_bus_iface.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 const struct iio_chan_spec ad7606b_bi_sw_channels[] = {
 	AD7606_BI_SW_CHANNEL(0),
 	AD7606_BI_SW_CHANNEL(1),
 	AD7606_BI_SW_CHANNEL(2),
 	AD7606_BI_SW_CHANNEL(3),
 	AD7606_BI_SW_CHANNEL(4),
 	AD7606_BI_SW_CHANNEL(5),
 	AD7606_BI_SW_CHANNEL(6),
 	AD7606_BI_SW_CHANNEL(7),
 };

 static int ad7606_par_bus_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_par_bus_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 int ad7606_par_bus_reg_read(struct ad7606_state *st, unsigned int addr)
 {
 	struct ad7606_platform_data *pdata = st->dev->platform_data;
 	int val, ret;

 	ret = pdata->bus_reg_read(st->back, addr, &val);
 	if (ret)
 		return ret;

 	return val;
 }

 static int ad7606_par_bus_reg_write(struct ad7606_state *st, unsigned int addr,
 				    unsigned int val)
 {
 	struct ad7606_platform_data *pdata = st->dev->platform_data;

 	return pdata->bus_reg_write(st->back, addr, val);
 }

 static int ad7606_par_bus_sw_mode_config(struct iio_dev *indio_dev)
 {
 	indio_dev->channels = ad7606b_bi_sw_channels;

 	return 0;
 }

 static const struct ad7606_bus_ops ad7606_bi_bops = {
 	.iio_backend_config = ad7606_par_bus_setup_iio_backend,
 	.update_scan_mode = ad7606_par_bus_update_scan_mode,
 	.reg_read = ad7606_par_bus_reg_read,
 	.reg_write = ad7606_par_bus_reg_write,
 	.sw_mode_config = ad7606_par_bus_sw_mode_config,
 };

 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");
	// 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"
	#include "ad7606_bus_iface.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 const struct iio_chan_spec ad7606b_bi_sw_channels[] = {
	AD7606_BI_SW_CHANNEL(0),
	AD7606_BI_SW_CHANNEL(1),
	AD7606_BI_SW_CHANNEL(2),
	AD7606_BI_SW_CHANNEL(3),
	AD7606_BI_SW_CHANNEL(4),
	AD7606_BI_SW_CHANNEL(5),
	AD7606_BI_SW_CHANNEL(6),
	AD7606_BI_SW_CHANNEL(7),
	};

	static int ad7606_par_bus_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_par_bus_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 int ad7606_par_bus_reg_read(struct ad7606_state *st, unsigned int addr)
	{
	struct ad7606_platform_data *pdata = st->dev->platform_data;
	int val, ret;

	ret = pdata->bus_reg_read(st->back, addr, &val);
	if (ret)
	return ret;

	return val;
	}

	static int ad7606_par_bus_reg_write(struct ad7606_state *st, unsigned int addr,
	unsigned int val)
	{
	struct ad7606_platform_data *pdata = st->dev->platform_data;

	return pdata->bus_reg_write(st->back, addr, val);
	}

	static int ad7606_par_bus_sw_mode_config(struct iio_dev *indio_dev)
	{
	indio_dev->channels = ad7606b_bi_sw_channels;

	return 0;
	}

	static const struct ad7606_bus_ops ad7606_bi_bops = {
	.iio_backend_config = ad7606_par_bus_setup_iio_backend,
	.update_scan_mode = ad7606_par_bus_update_scan_mode,
	.reg_read = ad7606_par_bus_reg_read,
	.reg_write = ad7606_par_bus_reg_write,
	.sw_mode_config = ad7606_par_bus_sw_mode_config,
	};

	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");