Libpayload: Add keyboard-disable function.
Add a function to disable and clear the keyboard controller.
Verified Code flow in normal boot/S3 resume with print statements.
Verified Keyboard was correctly disabled and flushed by booting
to recovery mode screen while pressing keys on the integrated
keyboard.
Change-Id: I3e1f011c3436fee5ce10993c6c26a3c8597c6fca
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/63627
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/4395
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/payloads/libpayload/drivers/keyboard.c b/payloads/libpayload/drivers/keyboard.c
index e65f085..0175bc7 100644
--- a/payloads/libpayload/drivers/keyboard.c
+++ b/payloads/libpayload/drivers/keyboard.c
@@ -31,6 +31,8 @@
#include <libpayload-config.h>
#include <libpayload.h>
+#define I8042_CMD_DIS_KB 0xad
+
struct layout_maps {
const char *country;
const unsigned short map[4][0x57];
@@ -300,3 +302,22 @@
console_add_input_driver(&cons);
}
+void keyboard_disconnect(void)
+{
+ /* If 0x64 returns 0xff, then we have no keyboard
+ * controller */
+ if (inb(0x64) == 0xFF)
+ return;
+
+ /* Empty keyboard buffer */
+ while (keyboard_havechar())
+ keyboard_getchar();
+
+ /* Send keyboard disconnect command */
+ outb(I8042_CMD_DIS_KB, 0x64);
+ keyboard_wait_write();
+
+ /* Hand off with empty buffer */
+ while (keyboard_havechar())
+ keyboard_getchar();
+}