1/*
2 * Copyright (C) 2013 - Virtual Open Systems
3 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/vfio.h>
18#include <linux/platform_device.h>
19
20#include "vfio_platform_private.h"
21
22#define DRIVER_VERSION  "0.10"
23#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis@virtualopensystems.com>"
24#define DRIVER_DESC     "VFIO for platform devices - User Level meta-driver"
25
26/* probing devices from the linux platform bus */
27
28static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
29					      int num)
30{
31	struct platform_device *dev = (struct platform_device *) vdev->opaque;
32	int i;
33
34	for (i = 0; i < dev->num_resources; i++) {
35		struct resource *r = &dev->resource[i];
36
37		if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
38			if (!num)
39				return r;
40
41			num--;
42		}
43	}
44	return NULL;
45}
46
47static int get_platform_irq(struct vfio_platform_device *vdev, int i)
48{
49	struct platform_device *pdev = (struct platform_device *) vdev->opaque;
50
51	return platform_get_irq(pdev, i);
52}
53
54static int vfio_platform_probe(struct platform_device *pdev)
55{
56	struct vfio_platform_device *vdev;
57	int ret;
58
59	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
60	if (!vdev)
61		return -ENOMEM;
62
63	vdev->opaque = (void *) pdev;
64	vdev->name = pdev->name;
65	vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
66	vdev->get_resource = get_platform_resource;
67	vdev->get_irq = get_platform_irq;
68
69	ret = vfio_platform_probe_common(vdev, &pdev->dev);
70	if (ret)
71		kfree(vdev);
72
73	return ret;
74}
75
76static int vfio_platform_remove(struct platform_device *pdev)
77{
78	struct vfio_platform_device *vdev;
79
80	vdev = vfio_platform_remove_common(&pdev->dev);
81	if (vdev) {
82		kfree(vdev);
83		return 0;
84	}
85
86	return -EINVAL;
87}
88
89static struct platform_driver vfio_platform_driver = {
90	.probe		= vfio_platform_probe,
91	.remove		= vfio_platform_remove,
92	.driver	= {
93		.name	= "vfio-platform",
94		.owner	= THIS_MODULE,
95	},
96};
97
98module_platform_driver(vfio_platform_driver);
99
100MODULE_VERSION(DRIVER_VERSION);
101MODULE_LICENSE("GPL v2");
102MODULE_AUTHOR(DRIVER_AUTHOR);
103MODULE_DESCRIPTION(DRIVER_DESC);
104