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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2020 DisplayLink (UK) Ltd.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "evdi_platform_dev.h"
#include <linux/version.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#if KERNEL_VERSION(5, 9, 0) <= LINUX_VERSION_CODE
#include <linux/iommu.h>
#endif
#include "evdi_platform_drv.h"
#include "evdi_debug.h"
#include "evdi_drm_drv.h"
struct evdi_platform_device_data {
struct drm_device *drm_dev;
struct device *parent;
bool symlinked;
};
struct platform_device *evdi_platform_dev_create(struct platform_device_info *info)
{
struct platform_device *platform_dev = NULL;
platform_dev = platform_device_register_full(info);
if (dma_set_mask(&platform_dev->dev, DMA_BIT_MASK(64))) {
EVDI_DEBUG("Unable to change dma mask to 64 bit. ");
EVDI_DEBUG("Sticking with 32 bit\n");
}
EVDI_INFO("Evdi platform_device create\n");
return platform_dev;
}
void evdi_platform_dev_destroy(struct platform_device *dev)
{
platform_device_unregister(dev);
EVDI_INFO("Evdi platform_device destroy\n");
}
int evdi_platform_device_probe(struct platform_device *pdev)
{
struct drm_device *dev = NULL;
struct evdi_platform_device_data *data =
kzalloc(sizeof(struct evdi_platform_device_data), GFP_KERNEL);
#if KERNEL_VERSION(5, 9, 0) <= LINUX_VERSION_CODE
#if IS_ENABLED(CONFIG_IOMMU_API) && defined(CONFIG_INTEL_IOMMU)
struct dev_iommu iommu;
#endif
#endif
EVDI_CHECKPT();
/* Intel-IOMMU workaround: platform-bus unsupported, force ID-mapping */
#if IS_ENABLED(CONFIG_IOMMU_API) && defined(CONFIG_INTEL_IOMMU)
#if KERNEL_VERSION(5, 9, 0) <= LINUX_VERSION_CODE
memset(&iommu, 0, sizeof(iommu));
iommu.priv = (void *)-1;
pdev->dev.iommu = &iommu;
#else
#define INTEL_IOMMU_DUMMY_DOMAIN ((void *)-1)
pdev->dev.archdata.iommu = INTEL_IOMMU_DUMMY_DOMAIN;
#endif
#endif
dev = evdi_drm_device_create(&pdev->dev);
if (IS_ERR_OR_NULL(dev))
kfree(data);
else {
data->drm_dev = dev;
data->symlinked = false;
platform_set_drvdata(pdev, data);
}
return PTR_ERR_OR_ZERO(dev);
}
int evdi_platform_device_remove(struct platform_device *pdev)
{
struct evdi_platform_device_data *data =
(struct evdi_platform_device_data *)platform_get_drvdata(pdev);
EVDI_CHECKPT();
evdi_drm_device_remove(data->drm_dev);
kfree(data);
return 0;
}
bool evdi_platform_device_is_free(struct platform_device *pdev)
{
struct evdi_platform_device_data *data =
(struct evdi_platform_device_data *)platform_get_drvdata(pdev);
struct evdi_device *evdi = data->drm_dev->dev_private;
if (evdi && !evdi_painter_is_connected(evdi->painter) &&
!data->symlinked)
return true;
return false;
}
void evdi_platform_device_link(struct platform_device *pdev,
struct device *parent)
{
struct evdi_platform_device_data *data = NULL;
char evdi_name[10] = { 0 };
int ret = 0;
if (!parent || !pdev)
return;
data = (struct evdi_platform_device_data *)platform_get_drvdata(pdev);
if (!evdi_platform_device_is_free(pdev)) {
EVDI_FATAL("Device is already attached can't symlink again\n");
return;
}
snprintf(evdi_name, sizeof(evdi_name), "evdi.%d", pdev->id);
ret = sysfs_create_link(&parent->kobj, &pdev->dev.kobj, evdi_name);
if (ret)
EVDI_FATAL("Failed to create sysfs link to parent device\n");
else {
data->symlinked = true;
data->parent = parent;
}
}
void evdi_platform_device_unlink_if_linked_with(struct platform_device *pdev,
struct device *parent)
{
struct evdi_platform_device_data *data =
(struct evdi_platform_device_data *)platform_get_drvdata(pdev);
if (data->parent == parent) {
data->symlinked = false;
data->parent = NULL;
EVDI_INFO("Detached from parent device\n");
}
}
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