linux-imx

// SPDX-License-Identifier: GPL-2.0-only

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/*

 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support

 *               extra sysfs attribute from DRM. Normal drm_sysfs_class

 *               does not allow adding attributes.

 *

 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>

 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>

 * Copyright (c) 2003-2004 IBM Corp.

 */

​

#include <linux/device.h>

#include <linux/kdev_t.h>

#include <linux/gfp.h>

#include <linux/err.h>

#include <linux/export.h>

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#include <drm/drm_sysfs.h>

#include <drm/drmP.h>

#include "drm_internal.h"

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#define to_drm_minor(d) dev_get_drvdata(d)

#define to_drm_connector(d) dev_get_drvdata(d)

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/**

 * DOC: overview

 *

 * DRM provides very little additional support to drivers for sysfs

 * interactions, beyond just all the standard stuff. Drivers who want to expose

 * additional sysfs properties and property groups can attach them at either

 * &drm_device.dev or &drm_connector.kdev.

 *

 * Registration is automatically handled when calling drm_dev_register(), or

 * drm_connector_register() in case of hot-plugged connectors. Unregistration is

 * also automatically handled by drm_dev_unregister() and

 * drm_connector_unregister().

 */

​

static struct device_type drm_sysfs_device_minor = {

    .name = "drm_minor"

};

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struct class *drm_class;

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static char *drm_devnode(struct device *dev, umode_t *mode)

{

    return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));

}

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static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");

​

/**

 * drm_sysfs_init - initialize sysfs helpers

 *

 * This is used to create the DRM class, which is the implicit parent of any

 * other top-level DRM sysfs objects.

 *

 * You must call drm_sysfs_destroy() to release the allocated resources.

 *

 * Return: 0 on success, negative error code on failure.

 */

int drm_sysfs_init(void)