input: add handler for reset and power key input events

Kernel device trees may indicate linux,code = KEY_POWER or KEY_RESTART,
mostly for gpio-keys. Make barebox able to act on them by registering an
appropriate input notifier.

Suggested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/input/specialkeys.c b/drivers/input/specialkeys.c
new file mode 100644
index 0000000000..ff29b8455d
--- /dev/null
+++ b/drivers/input/specialkeys.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Ahmad Fatoum, Pengutronix
+
+#include <common.h>
+#include <restart.h>
+#include <poweroff.h>
+#include <init.h>
+#include <input/input.h>
+#include <dt-bindings/input/linux-event-codes.h>
+
+static void input_specialkeys_notify(struct input_notifier *in,
+				     struct input_event *ev)
+{
+	switch (ev->code) {
+	case KEY_RESTART:
+		pr_info("Triggering reset due to special key.\n", ev->code);
+		restart_machine();
+		break;
+
+	case KEY_POWER:
+		pr_info("Triggering poweroff due to special key.\n", ev->code);
+		poweroff_machine();
+		break;
+	}
+
+	pr_debug("ignoring code: %d\n", ev->code);
+}
+
+static struct input_notifier notifier;
+
+static int input_specialkeys_init(void)
+{
+	notifier.notify = input_specialkeys_notify;
+	return input_register_notfier(&notifier);
+}
+late_initcall(input_specialkeys_init);