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150 lines
3.4 KiB
150 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Nano River Technologies viperboard IIO ADC driver |
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* |
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* (C) 2012 by Lemonage GmbH |
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* Author: Lars Poeschel <[email protected]> |
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* All rights reserved. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/mutex.h> |
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#include <linux/platform_device.h> |
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#include <linux/usb.h> |
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#include <linux/iio/iio.h> |
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#include <linux/mfd/viperboard.h> |
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#define VPRBRD_ADC_CMD_GET 0x00 |
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struct vprbrd_adc_msg { |
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u8 cmd; |
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u8 chan; |
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u8 val; |
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} __packed; |
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struct vprbrd_adc { |
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struct vprbrd *vb; |
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}; |
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#define VPRBRD_ADC_CHANNEL(_index) { \ |
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.type = IIO_VOLTAGE, \ |
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.indexed = 1, \ |
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.channel = _index, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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} |
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static struct iio_chan_spec const vprbrd_adc_iio_channels[] = { |
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VPRBRD_ADC_CHANNEL(0), |
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VPRBRD_ADC_CHANNEL(1), |
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VPRBRD_ADC_CHANNEL(2), |
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VPRBRD_ADC_CHANNEL(3), |
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}; |
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static int vprbrd_iio_read_raw(struct iio_dev *iio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, |
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int *val2, |
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long info) |
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{ |
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int ret, error = 0; |
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struct vprbrd_adc *adc = iio_priv(iio_dev); |
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struct vprbrd *vb = adc->vb; |
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struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf; |
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switch (info) { |
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case IIO_CHAN_INFO_RAW: |
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mutex_lock(&vb->lock); |
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admsg->cmd = VPRBRD_ADC_CMD_GET; |
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admsg->chan = chan->channel; |
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admsg->val = 0x00; |
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ret = usb_control_msg(vb->usb_dev, |
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usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC, |
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VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg, |
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sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS); |
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if (ret != sizeof(struct vprbrd_adc_msg)) { |
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dev_err(&iio_dev->dev, "usb send error on adc read\n"); |
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error = -EREMOTEIO; |
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} |
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ret = usb_control_msg(vb->usb_dev, |
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usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC, |
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VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg, |
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sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS); |
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*val = admsg->val; |
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mutex_unlock(&vb->lock); |
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if (ret != sizeof(struct vprbrd_adc_msg)) { |
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dev_err(&iio_dev->dev, "usb recv error on adc read\n"); |
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error = -EREMOTEIO; |
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} |
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if (error) |
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goto error; |
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return IIO_VAL_INT; |
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default: |
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error = -EINVAL; |
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break; |
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} |
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error: |
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return error; |
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} |
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static const struct iio_info vprbrd_adc_iio_info = { |
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.read_raw = &vprbrd_iio_read_raw, |
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}; |
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static int vprbrd_adc_probe(struct platform_device *pdev) |
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{ |
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struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent); |
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struct vprbrd_adc *adc; |
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struct iio_dev *indio_dev; |
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int ret; |
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/* registering iio */ |
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); |
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if (!indio_dev) { |
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dev_err(&pdev->dev, "failed allocating iio device\n"); |
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return -ENOMEM; |
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} |
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adc = iio_priv(indio_dev); |
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adc->vb = vb; |
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indio_dev->name = "viperboard adc"; |
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indio_dev->info = &vprbrd_adc_iio_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = vprbrd_adc_iio_channels; |
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indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels); |
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ret = devm_iio_device_register(&pdev->dev, indio_dev); |
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if (ret) { |
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dev_err(&pdev->dev, "could not register iio (adc)"); |
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return ret; |
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} |
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return 0; |
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} |
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static struct platform_driver vprbrd_adc_driver = { |
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.driver = { |
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.name = "viperboard-adc", |
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}, |
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.probe = vprbrd_adc_probe, |
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}; |
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module_platform_driver(vprbrd_adc_driver); |
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MODULE_AUTHOR("Lars Poeschel <[email protected]>"); |
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MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:viperboard-adc");
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