[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / uio / uio_pdrv.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->name = r->name;
		++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);
Commit	Line	Data
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>
2949ead4	14	#include <linux/module.h>
5a0e3ad6	15	#include <linux/slab.h>
4d80d594	16
a6fcc3a1	17	#define DRIVER_NAME "uio_pdrv"
4d80d594 UKK	18
	19	struct uio_platdata {
	20	struct uio_info *uioinfo;
	21	};
	22
	23	static 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;
28f65c11	62	uiomem->size = resource_size(r);
ecd43c0d	63	uiomem->name = r->name;
4d80d594 UKK	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);
	78	err_alloc_pdata:
	79	err_uioinfo:
	80	return ret;
	81	}
	82
	83	platform_set_drvdata(pdev, pdata);
	84
	85	return 0;
	86	}
	87
	88	static 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
331995e7 UKK	94	kfree(pdata);
331995e7 UKK	95
4d80d594 UKK	96	return 0;
	97	}
	98
	99	static 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
11e3123d	108	module_platform_driver(uio_pdrv);
4d80d594 UKK	109
	110	MODULE_AUTHOR("Uwe Kleine-Koenig");
	111	MODULE_DESCRIPTION("Userspace I/O platform driver");
0f90927d	112	MODULE_LICENSE("GPL v2");
4d80d594	113	MODULE_ALIAS("platform:" DRIVER_NAME);