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Kernel/SysFS: Add exposing interface for DisplayConnectors

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Under normal conditions (when mounting SysFS in /sys), there will be a
new directory in the /sys/devices directory called "graphics".
For now, under that directory there will be only a sub-directory called
"connectors" which will contain all DisplayConnectors' details, each in
its own sub-directory too, distinguished in naming with its minor
number.

Therefore, /sys/devices/graphics/connectors/MINOR_NUMBER/ will contain:
- General device attributes such as mutable_mode_setting_capable,
  double_buffering_capable, flush_support, partial_flush_support and
  refresh_rate_support. These values are exposed in the ioctl interface
  of the DisplayConnector class too, but these can be useful later on
  for command line utilities that want/need to expose these basic
  settings.
- The EDID blob, simply named "edid". This will help userspace to fetch
  the edid without the need of using the ioctl interface later on.
This commit is contained in:
Liav A 2022-07-16 08:08:53 +03:00 • committed by Linus Groh
parent cb900006b9
commit da8d18b263
12 changed files with 378 additions and 2 deletions
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26
Kernel/Graphics/DisplayConnector.cpp
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@ -4,6 +4,9 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/CharacterDevicesDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Graphics/DisplayConnector/DeviceDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Graphics/DisplayConnector/Directory.h>
#include <Kernel/Graphics/DisplayConnector.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Memory/MemoryManager.h>
@ -57,12 +60,31 @@ ErrorOr<size_t> DisplayConnector::write(OpenFileDescription&, u64, UserOrKernelB
void DisplayConnector::will_be_destroyed()
{
GraphicsManagement::the().detach_display_connector({}, *this);
Device::will_be_destroyed();
VERIFY(m_symlink_sysfs_component);
VERIFY(!is_block_device());
SysFSCharacterDevicesDirectory::the().m_child_components.with([&](auto& list) -> void {
list.remove(*m_symlink_sysfs_component);
});
m_symlink_sysfs_component.clear();
SysFSDisplayConnectorsDirectory::the().unplug({}, *m_sysfs_device_directory);
before_will_be_destroyed_remove_from_device_management();
}
void DisplayConnector::after_inserting()
{
Device::after_inserting();
after_inserting_add_to_device_management();
auto sysfs_display_connector_device_directory = DisplayConnectorSysFSDirectory::create(SysFSDisplayConnectorsDirectory::the(), *this);
m_sysfs_device_directory = sysfs_display_connector_device_directory;
SysFSDisplayConnectorsDirectory::the().plug({}, *sysfs_display_connector_device_directory);
VERIFY(!m_symlink_sysfs_component);
auto sys_fs_component = MUST(SysFSSymbolicLinkDeviceComponent::try_create(SysFSDeviceIdentifiersDirectory::the(), *this, *m_sysfs_device_directory));
m_symlink_sysfs_component = sys_fs_component;
VERIFY(!is_block_device());
SysFSCharacterDevicesDirectory::the().m_child_components.with([&](auto& list) -> void {
list.append(*m_symlink_sysfs_component);
});
auto rounded_size = MUST(Memory::page_round_up(m_framebuffer_resource_size));
if (!m_framebuffer_at_arbitrary_physical_range) {