Userland: Make graphics_connector_get_head_edid to read EDID from SysFS

The EDID blob is now exposed in the SysFS for each DisplayConnector, so
we don't need to use the ioctl interface anymore to read the EDID.

1 files changed, 28 insertions, 1 deletions

diff --git a/Kernel/API/FB.h b/Kernel/API/FB.h
index bb89042548..36948e3e61 100644
--- a/Kernel/API/FB.h
+++ b/Kernel/API/FB.h
@@ -7,9 +7,16 @@
 #pragma once
 
 #include <AK/Platform.h>
+#include <AK/ScopeGuard.h>
+#include <AK/String.h>
+#include <fcntl.h>
 #include <stddef.h>
+#include <stdio.h>
 #include <sys/cdefs.h>
 #include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
 
 __BEGIN_DECLS
 
@@ -20,7 +27,27 @@ ALWAYS_INLINE int graphics_connector_get_properties(int fd, GraphicsConnectorPro
 
 ALWAYS_INLINE int graphics_connector_get_head_edid(int fd, GraphicsHeadEDID* info)
 {
-    return ioctl(fd, GRAPHICS_IOCTL_GET_HEAD_EDID, info);
+    // FIXME: Optimize this function to get a minor number instead of a file descriptor.
+    struct stat display_connector_stat;
+    if (auto rc = fstat(fd, &display_connector_stat); rc < 0) {
+        return rc;
+    }
+    auto minor_number = minor(display_connector_stat.st_rdev);
+
+    auto edid_fd = open(String::formatted("/sys/devices/graphics/connectors/{}/edid", minor_number).characters(), O_RDONLY);
+    if (edid_fd < 0) {
+        return edid_fd;
+    }
+
+    ScopeGuard close_on_return([&]() {
+        close(edid_fd);
+    });
+
+    if (auto rc = read(edid_fd, info->bytes, info->bytes_size); rc < 0) {
+        return rc;
+    }
+
+    return 0;
 }
 
 ALWAYS_INLINE int fb_get_head_vertical_offset_buffer(int fd, GraphicsHeadVerticalOffset* vertical_offset)