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