Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013 - Virtual Open Systems
 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
 */
 
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vfio.h>
#include <linux/platform_device.h>
 
#include "vfio_platform_private.h"
 
#define DRIVER_VERSION  "0.10"
#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis@virtualopensystems.com>"
#define DRIVER_DESC     "VFIO for platform devices - User Level meta-driver"
 
static bool reset_required = true;
module_param(reset_required, bool, 0444);
MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
 
/* probing devices from the linux platform bus */
 
static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
<------><------><------><------><------>      int num)
{
<------>struct platform_device *dev = (struct platform_device *) vdev->opaque;
<------>int i;
 
<------>for (i = 0; i < dev->num_resources; i++) {
<------><------>struct resource *r = &dev->resource[i];
 
<------><------>if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
<------><------><------>if (!num)
<------><------><------><------>return r;
 
<------><------><------>num--;
<------><------>}
<------>}
<------>return NULL;
}
 
static int get_platform_irq(struct vfio_platform_device *vdev, int i)
{
<------>struct platform_device *pdev = (struct platform_device *) vdev->opaque;
 
<------>return platform_get_irq_optional(pdev, i);
}
 
static int vfio_platform_probe(struct platform_device *pdev)
{
<------>struct vfio_platform_device *vdev;
<------>int ret;
 
<------>vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
<------>if (!vdev)
<------><------>return -ENOMEM;
 
<------>vdev->opaque = (void *) pdev;
<------>vdev->name = pdev->name;
<------>vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
<------>vdev->get_resource = get_platform_resource;
<------>vdev->get_irq = get_platform_irq;
<------>vdev->parent_module = THIS_MODULE;
<------>vdev->reset_required = reset_required;
 
<------>ret = vfio_platform_probe_common(vdev, &pdev->dev);
<------>if (ret)
<------><------>kfree(vdev);
 
<------>return ret;
}
 
static int vfio_platform_remove(struct platform_device *pdev)
{
<------>struct vfio_platform_device *vdev;
 
<------>vdev = vfio_platform_remove_common(&pdev->dev);
<------>if (vdev) {
<------><------>kfree(vdev);
<------><------>return 0;
<------>}
 
<------>return -EINVAL;
}
 
static struct platform_driver vfio_platform_driver = {
<------>.probe		= vfio_platform_probe,
<------>.remove		= vfio_platform_remove,
<------>.driver	= {
<------><------>.name	= "vfio-platform",
<------>},
};
 
module_platform_driver(vfio_platform_driver);
 
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);