1 files changed, 74 insertions, 0 deletions

diff --git a/arch/x86/kernel/sysfb.c b/arch/x86/kernel/sysfb.c
new file mode 100644
index 000000000000..193ec2ce46c7
--- /dev/null
+++ b/arch/x86/kernel/sysfb.c
@@ -0,0 +1,74 @@
+/*
+ * Generic System Framebuffers on x86
+ * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+/*
+ * Simple-Framebuffer support for x86 systems
+ * Create a platform-device for any available boot framebuffer. The
+ * simple-framebuffer platform device is already available on DT systems, so
+ * this module parses the global "screen_info" object and creates a suitable
+ * platform device compatible with the "simple-framebuffer" DT object. If
+ * the framebuffer is incompatible, we instead create a legacy
+ * "vesa-framebuffer", "efi-framebuffer" or "platform-framebuffer" device and
+ * pass the screen_info as platform_data. This allows legacy drivers
+ * to pick these devices up without messing with simple-framebuffer drivers.
+ * The global "screen_info" is still valid at all times.
+ *
+ * If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer"
+ * platform devices, but only use legacy framebuffer devices for
+ * backwards compatibility.
+ *
+ * TODO: We set the dev_id field of all platform-devices to 0. This allows
+ * other x86 OF/DT parsers to create such devices, too. However, they must
+ * start at offset 1 for this to work.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/platform_data/simplefb.h>
+#include <linux/platform_device.h>
+#include <linux/screen_info.h>
+#include <asm/sysfb.h>
+
+static __init int sysfb_init(void)
+{
+        struct screen_info *si = &screen_info;
+        struct simplefb_platform_data mode;
+        struct platform_device *pd;
+        const char *name;
+        bool compatible;
+        int ret;
+
+        sysfb_apply_efi_quirks();
+
+        /* try to create a simple-framebuffer device */
+        compatible = parse_mode(si, &mode);
+        if (compatible) {
+                ret = create_simplefb(si, &mode);
+                if (!ret)
+                        return 0;
+        }
+
+        /* if the FB is incompatible, create a legacy framebuffer device */
+        if (si->orig_video_isVGA == VIDEO_TYPE_EFI)
+                name = "efi-framebuffer";
+        else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
+                name = "vesa-framebuffer";
+        else
+                name = "platform-framebuffer";
+
+        pd = platform_device_register_resndata(NULL, name, 0,
+                                               NULL, 0, si, sizeof(*si));
+        return IS_ERR(pd) ? PTR_ERR(pd) : 0;
+}
+
+/* must execute after PCI subsystem for EFI quirks */
+device_initcall(sysfb_init);