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135 lines
3.5 KiB
135 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IIO driver for the Measurement Computing CIO-DAC |
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* Copyright (C) 2016 William Breathitt Gray |
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* |
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* This driver supports the following Measurement Computing devices: CIO-DAC16, |
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* CIO-DAC06, and PC104-DAC06. |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/device.h> |
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#include <linux/errno.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/types.h> |
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#include <linux/io.h> |
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#include <linux/ioport.h> |
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#include <linux/isa.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#define CIO_DAC_NUM_CHAN 16 |
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#define CIO_DAC_CHAN(chan) { \ |
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.type = IIO_VOLTAGE, \ |
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.channel = chan, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.indexed = 1, \ |
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.output = 1 \ |
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} |
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#define CIO_DAC_EXTENT 32 |
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static unsigned int base[max_num_isa_dev(CIO_DAC_EXTENT)]; |
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static unsigned int num_cio_dac; |
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module_param_hw_array(base, uint, ioport, &num_cio_dac, 0); |
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MODULE_PARM_DESC(base, "Measurement Computing CIO-DAC base addresses"); |
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/** |
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* struct cio_dac_iio - IIO device private data structure |
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* @chan_out_states: channels' output states |
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* @base: base port address of the IIO device |
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*/ |
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struct cio_dac_iio { |
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int chan_out_states[CIO_DAC_NUM_CHAN]; |
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unsigned int base; |
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}; |
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static int cio_dac_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int *val, int *val2, long mask) |
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{ |
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struct cio_dac_iio *const priv = iio_priv(indio_dev); |
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if (mask != IIO_CHAN_INFO_RAW) |
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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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} |
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static int cio_dac_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int val, int val2, long mask) |
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{ |
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struct cio_dac_iio *const priv = iio_priv(indio_dev); |
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const unsigned int chan_addr_offset = 2 * chan->channel; |
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if (mask != IIO_CHAN_INFO_RAW) |
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return -EINVAL; |
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/* DAC can only accept up to a 16-bit value */ |
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if ((unsigned int)val > 65535) |
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return -EINVAL; |
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priv->chan_out_states[chan->channel] = val; |
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outw(val, priv->base + chan_addr_offset); |
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return 0; |
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} |
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static const struct iio_info cio_dac_info = { |
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.read_raw = cio_dac_read_raw, |
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.write_raw = cio_dac_write_raw |
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}; |
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static const struct iio_chan_spec cio_dac_channels[CIO_DAC_NUM_CHAN] = { |
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CIO_DAC_CHAN(0), CIO_DAC_CHAN(1), CIO_DAC_CHAN(2), CIO_DAC_CHAN(3), |
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CIO_DAC_CHAN(4), CIO_DAC_CHAN(5), CIO_DAC_CHAN(6), CIO_DAC_CHAN(7), |
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CIO_DAC_CHAN(8), CIO_DAC_CHAN(9), CIO_DAC_CHAN(10), CIO_DAC_CHAN(11), |
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CIO_DAC_CHAN(12), CIO_DAC_CHAN(13), CIO_DAC_CHAN(14), CIO_DAC_CHAN(15) |
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}; |
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static int cio_dac_probe(struct device *dev, unsigned int id) |
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{ |
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struct iio_dev *indio_dev; |
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struct cio_dac_iio *priv; |
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unsigned int i; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); |
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if (!indio_dev) |
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return -ENOMEM; |
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if (!devm_request_region(dev, base[id], CIO_DAC_EXTENT, |
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dev_name(dev))) { |
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dev_err(dev, "Unable to request port addresses (0x%X-0x%X)\n", |
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base[id], base[id] + CIO_DAC_EXTENT); |
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return -EBUSY; |
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} |
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indio_dev->info = &cio_dac_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = cio_dac_channels; |
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indio_dev->num_channels = CIO_DAC_NUM_CHAN; |
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indio_dev->name = dev_name(dev); |
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priv = iio_priv(indio_dev); |
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priv->base = base[id]; |
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/* initialize DAC outputs to 0V */ |
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for (i = 0; i < 32; i += 2) |
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outw(0, base[id] + i); |
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return devm_iio_device_register(dev, indio_dev); |
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} |
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static struct isa_driver cio_dac_driver = { |
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.probe = cio_dac_probe, |
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.driver = { |
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.name = "cio-dac" |
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} |
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}; |
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module_isa_driver(cio_dac_driver, num_cio_dac); |
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MODULE_AUTHOR("William Breathitt Gray <[email protected]>"); |
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MODULE_DESCRIPTION("Measurement Computing CIO-DAC IIO driver"); |
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MODULE_LICENSE("GPL v2");
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