113 строки
2.3 KiB
C
113 строки
2.3 KiB
C
/*
|
|
* 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/module.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,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(uio_pdrv);
|
|
|
|
MODULE_AUTHOR("Uwe Kleine-Koenig");
|
|
MODULE_DESCRIPTION("Userspace I/O platform driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|