linux-kernel - [RFC PATCH v3 07/13] vt: Add keyboard hook to disable bootsplash

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Date:   Wed, 17 Jan 2018 21:54:29 +0100
From:   Max Staudt <mstaudt@...e.de>
To:     b.zolnierkie@...sung.com, linux-fbdev@...r.kernel.org
Cc:     mstaudt@...e.de, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, tiwai@...e.com, oneukum@...e.com,
        msrb@...e.com, sndirsch@...e.com, michal@...kovi.net,
        philm@...jaro.org, bernhard.rosenkranzer@...aro.org,
        kernel.max@...as.org
Subject: [RFC PATCH v3 07/13] vt: Add keyboard hook to disable bootsplash

Let's disable the splash if the user presses ESC or F1-F12 on a VT.

The F1-F12 check is to disable the splash on VT switches.

Signed-off-by: Max Staudt <mstaudt@...e.de>
---
 drivers/tty/vt/keyboard.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index f4166263bb3a..a248429194bb 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -47,6 +47,8 @@
 
 #include <asm/irq_regs.h>
 
+#include <linux/bootsplash.h>
+
 extern void ctrl_alt_del(void);
 
 /*
@@ -1353,6 +1355,28 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
 	}
 #endif
 
+	/* Trap keys when bootsplash is shown */
+	if (bootsplash_would_render_now()) {
+		/* Deactivate bootsplash on ESC or Alt+Fxx VT switch */
+		if (keycode >= KEY_F1 && keycode <= KEY_F12) {
+			bootsplash_disable();
+
+			/*
+			 * No return here since we want to actually
+			 * perform the VT switch.
+			 */
+		} else {
+			if (keycode == KEY_ESC)
+				bootsplash_disable();
+
+			/*
+			 * Just drop any other keys.
+			 * Their effect would be hidden by the splash.
+			 */
+			return;
+		}
+	}
+
 	if (kbd->kbdmode == VC_MEDIUMRAW) {
 		/*
 		 * This is extended medium raw mode, with keys above 127
-- 
2.12.3