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[karo-tx-linux.git] / drivers / vfio / platform / vfio_platform.c
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
28 static 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
47 static 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
54 static 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         vdev->parent_module = THIS_MODULE;
69
70         ret = vfio_platform_probe_common(vdev, &pdev->dev);
71         if (ret)
72                 kfree(vdev);
73
74         return ret;
75 }
76
77 static int vfio_platform_remove(struct platform_device *pdev)
78 {
79         struct vfio_platform_device *vdev;
80
81         vdev = vfio_platform_remove_common(&pdev->dev);
82         if (vdev) {
83                 kfree(vdev);
84                 return 0;
85         }
86
87         return -EINVAL;
88 }
89
90 static struct platform_driver vfio_platform_driver = {
91         .probe          = vfio_platform_probe,
92         .remove         = vfio_platform_remove,
93         .driver = {
94                 .name   = "vfio-platform",
95                 .owner  = THIS_MODULE,
96         },
97 };
98
99 module_platform_driver(vfio_platform_driver);
100
101 MODULE_VERSION(DRIVER_VERSION);
102 MODULE_LICENSE("GPL v2");
103 MODULE_AUTHOR(DRIVER_AUTHOR);
104 MODULE_DESCRIPTION(DRIVER_DESC);