altos: Add power management APIs

[fw/altos] / src / kernel / ao_power.c

diff --git a/src/kernel/ao_power.c b/src/kernel/ao_power.c
new file mode 100644 (file)
index 0000000..bead594
--- /dev/null
+++ b/src/kernel/ao_power.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <ao.h>
+#include <ao_power.h>
+
+static struct ao_power *head, *tail;
+
+void
+ao_power_register(struct ao_power *power)
+{
+       if (power->registered)
+               return;
+       power->registered = TRUE;
+       if (tail) {
+               tail->next = power;
+               power->prev = tail;
+               tail = power;
+       } else {
+               head = tail = power;
+       }
+#ifdef AO_LED_POWER
+       ao_led_on(AO_LED_POWER);
+#endif
+}
+
+void
+ao_power_unregister(struct ao_power *power)
+{
+       if (!power->registered)
+               return;
+       power->registered = FALSE;
+       if (power->prev)
+               power->prev->next = power->next;
+       else
+               head = power->next;
+       if (power->next)
+               power->next->prev = power->prev;
+       else
+               tail = power->prev;
+}
+
+void
+ao_power_suspend(void)
+{
+       struct ao_power *p;
+
+#ifdef AO_LED_POWER
+       ao_led_off(AO_LED_POWER);
+#endif
+       for (p = tail; p; p = p->prev)
+               p->suspend(p->arg);
+}
+
+void
+ao_power_resume(void)
+{
+       struct ao_power *p;
+
+       for (p = head; p; p = p->next)
+               p->resume(p->arg);
+#ifdef AO_LED_POWER
+       ao_led_on(AO_LED_POWER);
+#endif
+}
+