DeviceAttribute.cpp 3.0 KB

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  1. /*
  2. * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
  3. *
  4. * SPDX-License-Identifier: BSD-2-Clause
  5. */
  6. #include <Kernel/Bus/PCI/API.h>
  7. #include <Kernel/Bus/PCI/Access.h>
  8. #include <Kernel/Debug.h>
  9. #include <Kernel/FileSystem/SysFS/Subsystems/Devices/Graphics/DisplayConnector/DeviceAttribute.h>
  10. #include <Kernel/Sections.h>
  11. namespace Kernel {
  12. StringView DisplayConnectorAttributeSysFSComponent::name() const
  13. {
  14. switch (m_type) {
  15. case Type::MutableModeSettingCapable:
  16. return "mutable_mode_setting_capable"sv;
  17. case Type::DoubleFrameBufferingCapable:
  18. return "double_framebuffering_capable"sv;
  19. case Type::FlushSupport:
  20. return "flush_support"sv;
  21. case Type::PartialFlushSupport:
  22. return "partial_flush_support"sv;
  23. case Type::RefreshRateSupport:
  24. return "refresh_rate_support"sv;
  25. case Type::EDID:
  26. return "edid"sv;
  27. default:
  28. VERIFY_NOT_REACHED();
  29. }
  30. }
  31. NonnullRefPtr<DisplayConnectorAttributeSysFSComponent> DisplayConnectorAttributeSysFSComponent::must_create(DisplayConnectorSysFSDirectory const& device_directory, Type type)
  32. {
  33. return adopt_ref(*new (nothrow) DisplayConnectorAttributeSysFSComponent(device_directory, type));
  34. }
  35. DisplayConnectorAttributeSysFSComponent::DisplayConnectorAttributeSysFSComponent(DisplayConnectorSysFSDirectory const& device_directory, Type type)
  36. : SysFSComponent()
  37. , m_device(device_directory.device({}))
  38. , m_type(type)
  39. {
  40. }
  41. ErrorOr<size_t> DisplayConnectorAttributeSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
  42. {
  43. auto blob = TRY(try_to_generate_buffer());
  44. if ((size_t)offset >= blob->size())
  45. return 0;
  46. ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
  47. TRY(buffer.write(blob->data() + offset, nread));
  48. return nread;
  49. }
  50. ErrorOr<NonnullOwnPtr<KBuffer>> DisplayConnectorAttributeSysFSComponent::try_to_generate_buffer() const
  51. {
  52. OwnPtr<KString> value;
  53. switch (m_type) {
  54. case Type::MutableModeSettingCapable:
  55. value = TRY(KString::formatted("{:d}", m_device->mutable_mode_setting_capable()));
  56. break;
  57. case Type::DoubleFrameBufferingCapable:
  58. value = TRY(KString::formatted("{:d}", m_device->double_framebuffering_capable()));
  59. break;
  60. case Type::FlushSupport:
  61. value = TRY(KString::formatted("{:d}", m_device->flush_support()));
  62. break;
  63. case Type::PartialFlushSupport:
  64. value = TRY(KString::formatted("{:d}", m_device->partial_flush_support()));
  65. break;
  66. case Type::RefreshRateSupport:
  67. value = TRY(KString::formatted("{:d}", m_device->refresh_rate_support()));
  68. break;
  69. case Type::EDID: {
  70. auto edid_buffer = TRY(m_device->get_edid());
  71. return KBuffer::try_create_with_bytes("SysFS DisplayConnectorAttributeSysFSComponent EDID buffer"sv, edid_buffer.bytes());
  72. }
  73. default:
  74. VERIFY_NOT_REACHED();
  75. }
  76. return KBuffer::try_create_with_bytes("SysFS DisplayConnectorAttributeSysFSComponent buffer"sv, value->view().bytes());
  77. }
  78. }