ARM: mioa701: poweroff the board on long power press

When the board is on console, a way is added to manually power off the
board, on a long power key press (4s).

This enables to be able to poweroff the board whatever the state, and is
the only manual way (no mechanical possibility).

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/boards/mioa701/Makefile

@@ -1,2 +1,2 @@
-obj-y += board.o
+obj-y += board.o gpio0_poweroff.o
 lwl-y += lowlevel.o

arch/arm/boards/mioa701/gpio0_poweroff.c

@@ -0,0 +1,81 @@
+/*
+ * (C) 2011 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <clock.h>
+#include <common.h>
+#include <init.h>
+#include <gpio.h>
+#include <poller.h>
+
+#include "mioa701.h"
+
+#define POWEROFF_SECS (4 * SECOND)
+
+static void blink_led_keyboard(void)
+{
+	gpio_set_value(GPIO115_LED_nKeyboard, 0);
+	mdelay(400);
+	gpio_set_value(GPIO115_LED_nKeyboard, 1);
+	mdelay(400);
+}
+
+static void try_poweroff(void)
+{
+	int poweroff_released = 0;
+
+	blink_led_keyboard();
+	poweroff_released |= !gpio_get_value(GPIO0_KEY_POWER);
+	if (poweroff_released)
+		return;
+
+	gpio_set_value(GPIO115_LED_nKeyboard, 0);
+	mdelay(2000);
+	poweroff();
+}
+
+static void gpio0_poller_fn(struct poller_struct *poller)
+{
+	static uint64_t gpio0_start;
+	static bool gpio0_activated;
+
+	if (!gpio_get_value(GPIO0_KEY_POWER)) {
+		gpio0_activated = false;
+		return;
+	}
+
+	if (gpio0_activated) {
+		if (is_timeout_non_interruptible(gpio0_start, POWEROFF_SECS)) {
+			try_poweroff();
+			gpio0_activated = false;
+		}
+	} else {
+		gpio0_activated = true;
+		gpio0_start = get_time_ns();
+	}
+}
+
+static struct poller_struct gpio0_poller = {
+	.func = gpio0_poller_fn,
+};
+
+static int gpio0_poweroff_probe(void)
+{
+	return poller_register(&gpio0_poller);
+}
+
+device_initcall(gpio0_poweroff_probe);