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