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);