157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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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 <poeschel@lemonage.de>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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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->dev.parent = &pdev->dev;
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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 <poeschel@lemonage.de>");
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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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