![Sanjeev Sharma](/assets/img/avatar_default.png)
This patch removes the .owner field for drivers which use the platform_driver_register api because this is overriden in _platform_driver_register. Signed-off-by: Sanjeev Sharma <Sanjeev_Sharma@mentor.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/*
|
|
* Nano River Technologies viperboard IIO ADC driver
|
|
*
|
|
* (C) 2012 by Lemonage GmbH
|
|
* Author: Lars Poeschel <poeschel@lemonage.de>
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/usb.h>
|
|
#include <linux/iio/iio.h>
|
|
|
|
#include <linux/mfd/viperboard.h>
|
|
|
|
#define VPRBRD_ADC_CMD_GET 0x00
|
|
|
|
struct vprbrd_adc_msg {
|
|
u8 cmd;
|
|
u8 chan;
|
|
u8 val;
|
|
} __packed;
|
|
|
|
struct vprbrd_adc {
|
|
struct vprbrd *vb;
|
|
};
|
|
|
|
#define VPRBRD_ADC_CHANNEL(_index) { \
|
|
.type = IIO_VOLTAGE, \
|
|
.indexed = 1, \
|
|
.channel = _index, \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
|
}
|
|
|
|
static struct iio_chan_spec const vprbrd_adc_iio_channels[] = {
|
|
VPRBRD_ADC_CHANNEL(0),
|
|
VPRBRD_ADC_CHANNEL(1),
|
|
VPRBRD_ADC_CHANNEL(2),
|
|
VPRBRD_ADC_CHANNEL(3),
|
|
};
|
|
|
|
static int vprbrd_iio_read_raw(struct iio_dev *iio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val,
|
|
int *val2,
|
|
long info)
|
|
{
|
|
int ret, error = 0;
|
|
struct vprbrd_adc *adc = iio_priv(iio_dev);
|
|
struct vprbrd *vb = adc->vb;
|
|
struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf;
|
|
|
|
switch (info) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
mutex_lock(&vb->lock);
|
|
|
|
admsg->cmd = VPRBRD_ADC_CMD_GET;
|
|
admsg->chan = chan->channel;
|
|
admsg->val = 0x00;
|
|
|
|
ret = usb_control_msg(vb->usb_dev,
|
|
usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
|
|
VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg,
|
|
sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
|
|
if (ret != sizeof(struct vprbrd_adc_msg)) {
|
|
dev_err(&iio_dev->dev, "usb send error on adc read\n");
|
|
error = -EREMOTEIO;
|
|
}
|
|
|
|
ret = usb_control_msg(vb->usb_dev,
|
|
usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
|
|
VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg,
|
|
sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
|
|
|
|
*val = admsg->val;
|
|
|
|
mutex_unlock(&vb->lock);
|
|
|
|
if (ret != sizeof(struct vprbrd_adc_msg)) {
|
|
dev_err(&iio_dev->dev, "usb recv error on adc read\n");
|
|
error = -EREMOTEIO;
|
|
}
|
|
|
|
if (error)
|
|
goto error;
|
|
|
|
return IIO_VAL_INT;
|
|
default:
|
|
error = -EINVAL;
|
|
break;
|
|
}
|
|
error:
|
|
return error;
|
|
}
|
|
|
|
static const struct iio_info vprbrd_adc_iio_info = {
|
|
.read_raw = &vprbrd_iio_read_raw,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int vprbrd_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent);
|
|
struct vprbrd_adc *adc;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
|
|
/* registering iio */
|
|
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
|
|
if (!indio_dev) {
|
|
dev_err(&pdev->dev, "failed allocating iio device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
adc = iio_priv(indio_dev);
|
|
adc->vb = vb;
|
|
indio_dev->name = "viperboard adc";
|
|
indio_dev->dev.parent = &pdev->dev;
|
|
indio_dev->info = &vprbrd_adc_iio_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = vprbrd_adc_iio_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels);
|
|
|
|
ret = devm_iio_device_register(&pdev->dev, indio_dev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "could not register iio (adc)");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver vprbrd_adc_driver = {
|
|
.driver = {
|
|
.name = "viperboard-adc",
|
|
},
|
|
.probe = vprbrd_adc_probe,
|
|
};
|
|
|
|
module_platform_driver(vprbrd_adc_driver);
|
|
|
|
MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
|
|
MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:viperboard-adc");
|