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iio: Add IIO support for the Measurement Computing CIO-DAC family
The Measurement Computing CIO-DAC is a family of 16-bit and 12-bit analog output devices. The analog outputs are from AD660BN/AD7237 converters with each output buffered by an OP-27. Voltage ranges are configured via physical jumpers on the device. This driver does not support the devices' simulataneous update mode; the XFER jumper option should be deselected for all analog output channels. This driver provides IIO support for the Measurement Computing CIO-DAC family: CIO-DAC16, CIO-DAC08, and PC104-DAC06. The base port addresses for the devices may be configured via the base array module parameter. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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William Breathitt Gray
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Jonathan Cameron
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Jul 24, 2016
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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> | ||
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#define CIO_DAC_NUM_CHAN 16 | ||
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#define CIO_DAC_CHAN(chan) { \ | ||
.type = IIO_VOLTAGE, \ | ||
.channel = chan, \ | ||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | ||
.indexed = 1, \ | ||
.output = 1 \ | ||
} | ||
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#define CIO_DAC_EXTENT 32 | ||
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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"); | ||
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/** | ||
* 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; | ||
}; | ||
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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); | ||
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if (mask != IIO_CHAN_INFO_RAW) | ||
return -EINVAL; | ||
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*val = priv->chan_out_states[chan->channel]; | ||
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return IIO_VAL_INT; | ||
} | ||
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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; | ||
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if (mask != IIO_CHAN_INFO_RAW) | ||
return -EINVAL; | ||
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/* DAC can only accept up to a 16-bit value */ | ||
if ((unsigned int)val > 65535) | ||
return -EINVAL; | ||
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priv->chan_out_states[chan->channel] = val; | ||
outw(val, priv->base + chan_addr_offset); | ||
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return 0; | ||
} | ||
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static const struct iio_info cio_dac_info = { | ||
.driver_module = THIS_MODULE, | ||
.read_raw = cio_dac_read_raw, | ||
.write_raw = cio_dac_write_raw | ||
}; | ||
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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) | ||
}; | ||
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static int cio_dac_probe(struct device *dev, unsigned int id) | ||
{ | ||
struct iio_dev *indio_dev; | ||
struct cio_dac_iio *priv; | ||
unsigned int i; | ||
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indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); | ||
if (!indio_dev) | ||
return -ENOMEM; | ||
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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; | ||
} | ||
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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); | ||
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priv = iio_priv(indio_dev); | ||
priv->base = base[id]; | ||
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/* initialize DAC outputs to 0V */ | ||
for (i = 0; i < 32; i += 2) | ||
outw(0, base[id] + i); | ||
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return devm_iio_device_register(dev, indio_dev); | ||
} | ||
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static struct isa_driver cio_dac_driver = { | ||
.probe = cio_dac_probe, | ||
.driver = { | ||
.name = "cio-dac" | ||
} | ||
}; | ||
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module_isa_driver(cio_dac_driver, num_cio_dac); | ||
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MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); | ||
MODULE_DESCRIPTION("Measurement Computing CIO-DAC IIO driver"); | ||
MODULE_LICENSE("GPL v2"); |