iio: Add IIO support for the Measurement Computing CIO-DAC family (3b8df5fd) · Commits · 戴 / test

MAINTAINERS

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		@@ -7318,6 +7318,12 @@ L: linux-iio@vger.kernel.org
		S: Maintained
		F: drivers/iio/potentiometer/mcp4531.c

		MEASUREMENT COMPUTING CIO-DAC IIO DRIVER
		M: William Breathitt Gray <vilhelm.gray@gmail.com>
		L: linux-iio@vger.kernel.org
		S: Maintained
		F: drivers/iio/dac/cio-dac.c

		MEDIA DRIVERS FOR RENESAS - VSP1
		M: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
		L: linux-media@vger.kernel.org

drivers/iio/dac/Kconfig

+9 −0

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		@@ -181,6 +181,15 @@ config AD7303
		To compile this driver as module choose M here: the module will be called
		ad7303.

		config CIO_DAC
		tristate "Measurement Computing CIO-DAC IIO driver"
		depends on X86 && ISA_BUS_API
		help
		Say yes here to build support for the Measurement Computing CIO-DAC
		analog output device family (CIO-DAC16, CIO-DAC08, PC104-DAC06). The
		base port addresses for the devices may be configured via the base
		array module parameter.

		config LPC18XX_DAC
		tristate "NXP LPC18xx DAC driver"
		depends on ARCH_LPC18XX \|\| COMPILE_TEST

drivers/iio/dac/Makefile

+1 −0

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		@@ -20,6 +20,7 @@ obj-$(CONFIG_AD5764) += ad5764.o
		obj-$(CONFIG_AD5791) += ad5791.o
		obj-$(CONFIG_AD5686) += ad5686.o
		obj-$(CONFIG_AD7303) += ad7303.o
		obj-$(CONFIG_CIO_DAC) += cio-dac.o
		obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o
		obj-$(CONFIG_M62332) += m62332.o
		obj-$(CONFIG_MAX517) += max517.o

drivers/iio/dac/cio-dac.c

0 → 100644

+144 −0

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		/*
		* IIO driver for the Measurement Computing CIO-DAC
		* Copyright (C) 2016 William Breathitt Gray
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License, version 2, as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*
		* This driver supports the following Measurement Computing devices: CIO-DAC16,
		* CIO-DAC06, and PC104-DAC06.
		*/
		#include <linux/bitops.h>
		#include <linux/device.h>
		#include <linux/errno.h>
		#include <linux/iio/iio.h>
		#include <linux/iio/types.h>
		#include <linux/io.h>
		#include <linux/ioport.h>
		#include <linux/isa.h>
		#include <linux/module.h>
		#include <linux/moduleparam.h>

		#define CIO_DAC_NUM_CHAN 16

		#define CIO_DAC_CHAN(chan) { \
		.type = IIO_VOLTAGE, \
		.channel = chan, \
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
		.indexed = 1, \
		.output = 1 \
		}

		#define CIO_DAC_EXTENT 32

		static unsigned int base[max_num_isa_dev(CIO_DAC_EXTENT)];
		static unsigned int num_cio_dac;
		module_param_array(base, uint, &num_cio_dac, 0);
		MODULE_PARM_DESC(base, "Measurement Computing CIO-DAC base addresses");

		/**
		* struct cio_dac_iio - IIO device private data structure
		* @chan_out_states: channels' output states
		* @base: base port address of the IIO device
		*/
		struct cio_dac_iio {
		int chan_out_states[CIO_DAC_NUM_CHAN];
		unsigned int base;
		};

		static int cio_dac_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const chan, int val, int *val2, long mask)
		{
		struct cio_dac_iio *const priv = iio_priv(indio_dev);

		if (mask != IIO_CHAN_INFO_RAW)
		return -EINVAL;

		*val = priv->chan_out_states[chan->channel];

		return IIO_VAL_INT;
		}

		static int cio_dac_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan, int val, int val2, long mask)
		{
		struct cio_dac_iio *const priv = iio_priv(indio_dev);
		const unsigned int chan_addr_offset = 2 * chan->channel;

		if (mask != IIO_CHAN_INFO_RAW)
		return -EINVAL;

		/* DAC can only accept up to a 16-bit value */
		if ((unsigned int)val > 65535)
		return -EINVAL;

		priv->chan_out_states[chan->channel] = val;
		outw(val, priv->base + chan_addr_offset);

		return 0;
		}

		static const struct iio_info cio_dac_info = {
		.driver_module = THIS_MODULE,
		.read_raw = cio_dac_read_raw,
		.write_raw = cio_dac_write_raw
		};

		static const struct iio_chan_spec cio_dac_channels[CIO_DAC_NUM_CHAN] = {
		CIO_DAC_CHAN(0), CIO_DAC_CHAN(1), CIO_DAC_CHAN(2), CIO_DAC_CHAN(3),
		CIO_DAC_CHAN(4), CIO_DAC_CHAN(5), CIO_DAC_CHAN(6), CIO_DAC_CHAN(7),
		CIO_DAC_CHAN(8), CIO_DAC_CHAN(9), CIO_DAC_CHAN(10), CIO_DAC_CHAN(11),
		CIO_DAC_CHAN(12), CIO_DAC_CHAN(13), CIO_DAC_CHAN(14), CIO_DAC_CHAN(15)
		};

		static int cio_dac_probe(struct device *dev, unsigned int id)
		{
		struct iio_dev *indio_dev;
		struct cio_dac_iio *priv;
		unsigned int i;

		indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
		if (!indio_dev)
		return -ENOMEM;

		if (!devm_request_region(dev, base[id], CIO_DAC_EXTENT,
		dev_name(dev))) {
		dev_err(dev, "Unable to request port addresses (0x%X-0x%X)\n",
		base[id], base[id] + CIO_DAC_EXTENT);
		return -EBUSY;
		}

		indio_dev->info = &cio_dac_info;
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->channels = cio_dac_channels;
		indio_dev->num_channels = CIO_DAC_NUM_CHAN;
		indio_dev->name = dev_name(dev);

		priv = iio_priv(indio_dev);
		priv->base = base[id];

		/* initialize DAC outputs to 0V */
		for (i = 0; i < 32; i += 2)
		outw(0, base[id] + i);

		return devm_iio_device_register(dev, indio_dev);
		}

		static struct isa_driver cio_dac_driver = {
		.probe = cio_dac_probe,
		.driver = {
		.name = "cio-dac"
		}
		};

		module_isa_driver(cio_dac_driver, num_cio_dac);

		MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
		MODULE_DESCRIPTION("Measurement Computing CIO-DAC IIO driver");
		MODULE_LICENSE("GPL v2");

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