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