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da8d18b263
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.
87 lines
3 KiB
C++
87 lines
3 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Graphics/DisplayConnector/DeviceAttribute.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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StringView DisplayConnectorAttributeSysFSComponent::name() const
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{
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switch (m_type) {
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case Type::MutableModeSettingCapable:
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return "mutable_mode_setting_capable"sv;
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case Type::DoubleFrameBufferingCapable:
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return "double_framebuffering_capable"sv;
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case Type::FlushSupport:
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return "flush_support"sv;
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case Type::PartialFlushSupport:
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return "partial_flush_support"sv;
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case Type::RefreshRateSupport:
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return "refresh_rate_support"sv;
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case Type::EDID:
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return "edid"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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NonnullRefPtr<DisplayConnectorAttributeSysFSComponent> DisplayConnectorAttributeSysFSComponent::must_create(DisplayConnectorSysFSDirectory const& device_directory, Type type)
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{
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return adopt_ref(*new (nothrow) DisplayConnectorAttributeSysFSComponent(device_directory, type));
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}
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DisplayConnectorAttributeSysFSComponent::DisplayConnectorAttributeSysFSComponent(DisplayConnectorSysFSDirectory const& device_directory, Type type)
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: SysFSComponent()
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, m_device(device_directory.device({}))
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, m_type(type)
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{
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}
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ErrorOr<size_t> DisplayConnectorAttributeSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
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{
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auto blob = TRY(try_to_generate_buffer());
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if ((size_t)offset >= blob->size())
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return 0;
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ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
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TRY(buffer.write(blob->data() + offset, nread));
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return nread;
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}
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ErrorOr<NonnullOwnPtr<KBuffer>> DisplayConnectorAttributeSysFSComponent::try_to_generate_buffer() const
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{
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OwnPtr<KString> value;
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switch (m_type) {
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case Type::MutableModeSettingCapable:
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value = TRY(KString::formatted("{:d}", m_device->mutable_mode_setting_capable()));
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break;
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case Type::DoubleFrameBufferingCapable:
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value = TRY(KString::formatted("{:d}", m_device->double_framebuffering_capable()));
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break;
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case Type::FlushSupport:
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value = TRY(KString::formatted("{:d}", m_device->flush_support()));
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break;
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case Type::PartialFlushSupport:
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value = TRY(KString::formatted("{:d}", m_device->partial_flush_support()));
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break;
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case Type::RefreshRateSupport:
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value = TRY(KString::formatted("{:d}", m_device->refresh_rate_support()));
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break;
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case Type::EDID: {
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auto edid_buffer = TRY(m_device->get_edid());
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return KBuffer::try_create_with_bytes("SysFS DisplayConnectorAttributeSysFSComponent EDID buffer"sv, edid_buffer.bytes());
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}
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default:
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VERIFY_NOT_REACHED();
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}
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return KBuffer::try_create_with_bytes("SysFS DisplayConnectorAttributeSysFSComponent buffer"sv, value->view().bytes());
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}
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}
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