linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright 2018 Noralf Trønnes

 */

​

#include <linux/list.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/seq_file.h>

#include <linux/slab.h>

​

#include <drm/drm_client.h>

#include <drm/drm_debugfs.h>

#include <drm/drm_device.h>

#include <drm/drm_drv.h>

#include <drm/drm_file.h>

#include <drm/drm_fourcc.h>

#include <drm/drm_gem.h>

#include <drm/drm_mode.h>

#include <drm/drm_print.h>

#include <drm/drmP.h>

​

#include "drm_crtc_internal.h"

#include "drm_internal.h"

​

/**

 * DOC: overview

 *

 * This library provides support for clients running in the kernel like fbdev and bootsplash.

 * Currently it's only partially implemented, just enough to support fbdev.

 *

 * GEM drivers which provide a GEM based dumb buffer with a virtual address are supported.

 */

​

static int drm_client_open(struct drm_client_dev *client)

{

    struct drm_device *dev = client->dev;

    struct drm_file *file;

​

    file = drm_file_alloc(dev->primary);

    if (IS_ERR(file))

        return PTR_ERR(file);

​

    mutex_lock(&dev->filelist_mutex);

    list_add(&file->lhead, &dev->filelist_internal);

    mutex_unlock(&dev->filelist_mutex);

​

    client->file = file;

​

    return 0;

}

​

static void drm_client_close(struct drm_client_dev *client)

{

    struct drm_device *dev = client->dev;

​

    mutex_lock(&dev->filelist_mutex);

    list_del(&client->file->lhead);

    mutex_unlock(&dev->filelist_mutex);

​

    drm_file_free(client->file);

}

EXPORT_SYMBOL(drm_client_close);

​

/**

 * drm_client_init - Initialise a DRM client

 * @dev: DRM device

 * @client: DRM client

 * @name: Client name

 * @funcs: DRM client functions (optional)

 *

 * This initialises the client and opens a &drm_file.

 * Use drm_client_register() to complete the process.

 * The caller needs to hold a reference on @dev before calling this function.

 * The client is freed when the &drm_device is unregistered. See drm_client_release().

 *

 * Returns:

 * Zero on success or negative error code on failure.

 */

int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,

            const char *name, const struct drm_client_funcs *funcs)

{

    int ret;

​

    if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)

        return -EOPNOTSUPP;

​

    if (funcs && !try_module_get(funcs->owner))

        return -ENODEV;

​

    client->dev = dev;

    client->name = name;