1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
* drivers/uio/uio_pdrv.c
*
* Copyright (C) 2008 by Digi International Inc.
* 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 version 2 as published by
* the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <linux/uio_driver.h>
#include <linux/stringify.h>
#include <linux/slab.h>
#define DRIVER_NAME "uio_pdrv"
struct uio_platdata {
struct uio_info *uioinfo;
};
static int uio_pdrv_probe(struct platform_device *pdev)
{
struct uio_info *uioinfo = pdev->dev.platform_data;
struct uio_platdata *pdata;
struct uio_mem *uiomem;
int ret = -ENODEV;
int i;
if (!uioinfo || !uioinfo->name || !uioinfo->version) {
dev_dbg(&pdev->dev, "%s: err_uioinfo\n", __func__);
goto err_uioinfo;
}
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
ret = -ENOMEM;
dev_dbg(&pdev->dev, "%s: err_alloc_pdata\n", __func__);
goto err_alloc_pdata;
}
pdata->uioinfo = uioinfo;
uiomem = &uioinfo->mem[0];
for (i = 0; i < pdev->num_resources; ++i) {
struct resource *r = &pdev->resource[i];
if (r->flags != IORESOURCE_MEM)
continue;
if (uiomem >= &uioinfo->mem[MAX_UIO_MAPS]) {
dev_warn(&pdev->dev, "device has more than "
__stringify(MAX_UIO_MAPS)
" I/O memory resources.\n");
break;
}
uiomem->memtype = UIO_MEM_PHYS;
uiomem->addr = r->start;
uiomem->size = resource_size(r);
++uiomem;
}
while (uiomem < &uioinfo->mem[MAX_UIO_MAPS]) {
uiomem->size = 0;
++uiomem;
}
pdata->uioinfo->priv = pdata;
ret = uio_register_device(&pdev->dev, pdata->uioinfo);
if (ret) {
kfree(pdata);
err_alloc_pdata:
err_uioinfo:
return ret;
}
platform_set_drvdata(pdev, pdata);
return 0;
}
static int uio_pdrv_remove(struct platform_device *pdev)
{
struct uio_platdata *pdata = platform_get_drvdata(pdev);
uio_unregister_device(pdata->uioinfo);
kfree(pdata);
return 0;
}
static struct platform_driver uio_pdrv = {
.probe = uio_pdrv_probe,
.remove = uio_pdrv_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init uio_pdrv_init(void)
{
return platform_driver_register(&uio_pdrv);
}
static void __exit uio_pdrv_exit(void)
{
platform_driver_unregister(&uio_pdrv);
}
module_init(uio_pdrv_init);
module_exit(uio_pdrv_exit);
MODULE_AUTHOR("Uwe Kleine-Koenig");
MODULE_DESCRIPTION("Userspace I/O platform driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
|
