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Kernel: Add ioctl to get the EDID from a framebuffer

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Tom 2021-12-31 22:02:55 -07:00 • committed by Linus Groh
parent 8184870f93
commit 03c45b1865
Notes: sideshowbarker 2024-07-17 20:21:28 +09:00
20 changed files with 265 additions and 84 deletions
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26
Kernel/Graphics/GenericFramebufferDevice.cpp
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@ -33,7 +33,11 @@ ErrorOr<void> GenericFramebufferDevice::verify_head_index(int head_index) const
ErrorOr<void> GenericFramebufferDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
TRY(Process::current().require_promise(Pledge::video));
if (request != FB_IOCTL_GET_HEAD_EDID) {
// Allow anyone to query the EDID. Eventually we'll publish the current EDID on /sys
// so it doesn't really make sense to require the video pledge to query it.
TRY(Process::current().require_promise(Pledge::video));
}
switch (request) {
case FB_IOCTL_GET_PROPERTIES: {
auto user_properties = static_ptr_cast<FBProperties*>(arg);
@ -60,6 +64,26 @@ ErrorOr<void> GenericFramebufferDevice::ioctl(OpenFileDescription&, unsigned req
head_properties.offset = TRY(vertical_offset(head_properties.head_index));
return copy_to_user(user_head_properties, &head_properties);
}
case FB_IOCTL_GET_HEAD_EDID: {
auto user_head_edid = static_ptr_cast<FBHeadEDID*>(arg);
FBHeadEDID head_edid {};
TRY(copy_from_user(&head_edid, user_head_edid));
TRY(verify_head_index(head_edid.head_index));
auto edid_bytes = TRY(get_edid(head_edid.head_index));
if (head_edid.bytes != nullptr) {
// Only return the EDID if a buffer was provided. Either way,
// we'll write back the bytes_size with the actual size
if (head_edid.bytes_size < edid_bytes.size()) {
head_edid.bytes_size = edid_bytes.size();
TRY(copy_to_user(user_head_edid, &head_edid));
return Error::from_errno(EOVERFLOW);
}
TRY(copy_to_user(head_edid.bytes, (void const*)edid_bytes.data(), edid_bytes.size()));
}
head_edid.bytes_size = edid_bytes.size();
return copy_to_user(user_head_edid, &head_edid);
}
case FB_IOCTL_SET_HEAD_RESOLUTION: {
auto user_head_resolution = static_ptr_cast<FBHeadResolution const*>(arg);
auto head_resolution = TRY(copy_typed_from_user(user_head_resolution));