Button sensor driver

platform/sky/dev/button-sensor.c

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2005, Swedish Institute of Computer Science
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * @(#)$Id: button-sensor.c,v 1.1 2007/03/15 21:44:51 adamdunkels Exp $
+ */
+
+#include "lib/sensors.h"
+#include "dev/hwconf.h"
+#include "dev/button-sensor.h"
+
+#include "dev/leds.h"
+
+const struct sensors_sensor button_sensor;
+
+static struct timer debouncetimer;
+
+HWCONF_PIN(BUTTON, 2, 7);
+HWCONF_IRQ(BUTTON, 2, 7);
+
+/*---------------------------------------------------------------------------*/
+static void
+init(void)
+{
+  timer_set(&debouncetimer, 0);
+  BUTTON_IRQ_EDGE_SELECTD();
+
+  BUTTON_SELECT();
+  BUTTON_MAKE_INPUT();
+}
+/*---------------------------------------------------------------------------*/
+static int
+irq(void)
+{
+  if(BUTTON_CHECK_IRQ()) {
+    if(timer_expired(&debouncetimer)) {
+      timer_set(&debouncetimer, CLOCK_SECOND / 4);
+      sensors_changed(&button_sensor);
+      return 1;
+    }
+  }
+
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static void
+activate(void)
+{
+  sensors_add_irq(&button_sensor, BUTTON_IRQ_PORT());
+  BUTTON_ENABLE_IRQ();
+}
+/*---------------------------------------------------------------------------*/
+static void
+deactivate(void)
+{
+  BUTTON_DISABLE_IRQ();
+  sensors_remove_irq(&button_sensor, BUTTON_IRQ_PORT());
+}
+/*---------------------------------------------------------------------------*/
+static int
+active(void)
+{
+  return BUTTON_IRQ_ENABLED();
+}
+/*---------------------------------------------------------------------------*/
+static unsigned int
+value(int type)
+{
+  return BUTTON_READ() || !timer_expired(&debouncetimer);
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, void *c)
+{
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static void *
+status(int type)
+{
+  return NULL;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
+	       init, irq, activate, deactivate, active,
+	       value, configure, status);