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4d80d594 UKK |
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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
4d80d594 | 15 | |
a6fcc3a1 | 16 | #define DRIVER_NAME "uio_pdrv" |
4d80d594 UKK |
17 | |
18 | struct uio_platdata { | |
19 | struct uio_info *uioinfo; | |
20 | }; | |
21 | ||
22 | static int uio_pdrv_probe(struct platform_device *pdev) | |
23 | { | |
24 | struct uio_info *uioinfo = pdev->dev.platform_data; | |
25 | struct uio_platdata *pdata; | |
26 | struct uio_mem *uiomem; | |
27 | int ret = -ENODEV; | |
28 | int i; | |
29 | ||
30 | if (!uioinfo || !uioinfo->name || !uioinfo->version) { | |
31 | dev_dbg(&pdev->dev, "%s: err_uioinfo\n", __func__); | |
32 | goto err_uioinfo; | |
33 | } | |
34 | ||
35 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
36 | if (!pdata) { | |
37 | ret = -ENOMEM; | |
38 | dev_dbg(&pdev->dev, "%s: err_alloc_pdata\n", __func__); | |
39 | goto err_alloc_pdata; | |
40 | } | |
41 | ||
42 | pdata->uioinfo = uioinfo; | |
43 | ||
44 | uiomem = &uioinfo->mem[0]; | |
45 | ||
46 | for (i = 0; i < pdev->num_resources; ++i) { | |
47 | struct resource *r = &pdev->resource[i]; | |
48 | ||
49 | if (r->flags != IORESOURCE_MEM) | |
50 | continue; | |
51 | ||
52 | if (uiomem >= &uioinfo->mem[MAX_UIO_MAPS]) { | |
53 | dev_warn(&pdev->dev, "device has more than " | |
54 | __stringify(MAX_UIO_MAPS) | |
55 | " I/O memory resources.\n"); | |
56 | break; | |
57 | } | |
58 | ||
59 | uiomem->memtype = UIO_MEM_PHYS; | |
60 | uiomem->addr = r->start; | |
28f65c11 | 61 | uiomem->size = resource_size(r); |
4d80d594 UKK |
62 | ++uiomem; |
63 | } | |
64 | ||
65 | while (uiomem < &uioinfo->mem[MAX_UIO_MAPS]) { | |
66 | uiomem->size = 0; | |
67 | ++uiomem; | |
68 | } | |
69 | ||
70 | pdata->uioinfo->priv = pdata; | |
71 | ||
72 | ret = uio_register_device(&pdev->dev, pdata->uioinfo); | |
73 | ||
74 | if (ret) { | |
75 | kfree(pdata); | |
76 | err_alloc_pdata: | |
77 | err_uioinfo: | |
78 | return ret; | |
79 | } | |
80 | ||
81 | platform_set_drvdata(pdev, pdata); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int uio_pdrv_remove(struct platform_device *pdev) | |
87 | { | |
88 | struct uio_platdata *pdata = platform_get_drvdata(pdev); | |
89 | ||
90 | uio_unregister_device(pdata->uioinfo); | |
91 | ||
331995e7 UKK |
92 | kfree(pdata); |
93 | ||
4d80d594 UKK |
94 | return 0; |
95 | } | |
96 | ||
97 | static struct platform_driver uio_pdrv = { | |
98 | .probe = uio_pdrv_probe, | |
99 | .remove = uio_pdrv_remove, | |
100 | .driver = { | |
101 | .name = DRIVER_NAME, | |
102 | .owner = THIS_MODULE, | |
103 | }, | |
104 | }; | |
105 | ||
106 | static int __init uio_pdrv_init(void) | |
107 | { | |
108 | return platform_driver_register(&uio_pdrv); | |
109 | } | |
110 | ||
111 | static void __exit uio_pdrv_exit(void) | |
112 | { | |
113 | platform_driver_unregister(&uio_pdrv); | |
114 | } | |
115 | module_init(uio_pdrv_init); | |
116 | module_exit(uio_pdrv_exit); | |
117 | ||
118 | MODULE_AUTHOR("Uwe Kleine-Koenig"); | |
119 | MODULE_DESCRIPTION("Userspace I/O platform driver"); | |
0f90927d | 120 | MODULE_LICENSE("GPL v2"); |
4d80d594 | 121 | MODULE_ALIAS("platform:" DRIVER_NAME); |