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diff --git a/src/common/power.c b/src/common/power.c
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+/* power.c */
+/* binwatch - Tiny binary wristwatch. {{{
+ *
+ * Copyright (C) 2011 Nicolas Schodet
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Contact :
+ * Web: http://ni.fr.eu.org/
+ * Email: <nico at ni.fr.eu.org>
+ * }}} */
+#include "common.h"
+#include "power.h"
+#include "io.h"
+
+#include <avr/sleep.h>
+
+void
+power_init (void)
+{
+ /* Shutdown unused peripherals. */
+ /* Analog comparator. */
+ ACSR = _BV (ACD);
+ /* Timers, USI and ADC. */
+ PRR = _BV (PRTIM1) | _BV (PRTIM0) | _BV (PRUSI) | _BV (PRADC);
+ /* B3, B4, B5 input values are never read. */
+ DIDR0 = 0b111000;
+}
+
+void
+power_sleep (void)
+{
+ /* Enable interrupts right before sleep instruction so that any pending
+ * interrupt will occur after the processor go to sleep and really wake
+ * the processor. See avr-libc documentation. */
+ set_sleep_mode (SLEEP_MODE_PWR_DOWN);
+ sleep_enable ();
+ sei ();
+ sleep_cpu ();
+ sleep_disable ();
+ cli ();
+}
+