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->name = r->name;
  64                ++uiomem;
  65        }
  66
  67        while (uiomem < &uioinfo->mem[MAX_UIO_MAPS]) {
  68                uiomem->size = 0;
  69                ++uiomem;
  70        }
  71
  72        pdata->uioinfo->priv = pdata;
  73
  74        ret = uio_register_device(&pdev->dev, pdata->uioinfo);
  75
  76        if (ret) {
  77                kfree(pdata);
  78err_alloc_pdata:
  79err_uioinfo:
  80                return ret;
  81        }
  82
  83        platform_set_drvdata(pdev, pdata);
  84
  85        return 0;
  86}
  87
  88static int uio_pdrv_remove(struct platform_device *pdev)
  89{
  90        struct uio_platdata *pdata = platform_get_drvdata(pdev);
  91
  92        uio_unregister_device(pdata->uioinfo);
  93
  94        kfree(pdata);
  95
  96        return 0;
  97}
  98
  99static struct platform_driver uio_pdrv = {
 100        .probe = uio_pdrv_probe,
 101        .remove = uio_pdrv_remove,
 102        .driver = {
 103                .name = DRIVER_NAME,
 104                .owner = THIS_MODULE,
 105        },
 106};
 107
 108module_platform_driver(uio_pdrv);
 109
 110MODULE_AUTHOR("Uwe Kleine-Koenig");
 111MODULE_DESCRIPTION("Userspace I/O platform driver");
 112MODULE_LICENSE("GPL v2");
 113MODULE_ALIAS("platform:" DRIVER_NAME);
 114
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