ryu: add a dummy power module for controlling sensors.

With this change we can use power event to configure sensors
and trigger motion detection in suspend.

BUG=chrome-os-partner:31071
BRANCH=ToT
TEST=Check power states. Check power up messages and commands are
present at the console.

Message at boot:
[0.007142 hash start 0x00010000 0x000096dd]
[0.007293 Inits done]
[0.007506 power state 2 = S3, in 0x0000]
[0.007765 power state 3 = S0, in 0x0000]
[0.007908 event set 0x00002000]
[0.008021 hostcmd init 0x2000]
[0.146870 hash done
f87d7824b439db923d270df016af5aabec51b73505b7c4faa6e40c16b12dd392]

Change-Id: I9c56fe5203506462f0820bbc8a5fe4528f6805ac
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/226881
Reviewed-by: Sheng-liang Song <ssl@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>

3 files changed, 58 insertions, 0 deletions

diff --git a/power/build.mk b/power/build.mk
index 5e62330490..8d2d10ff8c 100644
--- a/power/build.mk
+++ b/power/build.mk
@@ -7,6 +7,7 @@
 #
 
 power-$(CONFIG_CHIPSET_BAYTRAIL)+=baytrail.o
+power-$(CONFIG_CHIPSET_ECDRIVEN)+=ec_driven.o
 power-$(CONFIG_CHIPSET_GAIA)+=gaia.o
 power-$(CONFIG_CHIPSET_HASWELL)+=haswell.o
 power-$(CONFIG_CHIPSET_IVYBRIDGE)+=ivybridge.o
diff --git a/power/common.c b/power/common.c
index e08fcf369c..b1bced365d 100644
--- a/power/common.c
+++ b/power/common.c
@@ -328,6 +328,7 @@ static void power_lid_change(void)
 }
 DECLARE_HOOK(HOOK_LID_CHANGE, power_lid_change, HOOK_PRIO_DEFAULT);
 
+#ifdef CONFIG_EXTPOWER
 static void power_ac_change(void)
 {
 	if (extpower_is_present()) {
@@ -342,6 +343,7 @@ static void power_ac_change(void)
 	}
 }
 DECLARE_HOOK(HOOK_AC_CHANGE, power_ac_change, HOOK_PRIO_DEFAULT);
+#endif
 
 /*****************************************************************************/
 /* Interrupts */
diff --git a/power/ec_driven.c b/power/ec_driven.c
new file mode 100644
index 0000000000..67cfefb95e
--- /dev/null
+++ b/power/ec_driven.c
@@ -0,0 +1,55 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/*
+ * Dummy power module for Sensor HUB.
+ *
+ * This implements the following features:
+ * when AP_IN_SUSPEND is low, in S0, otherwise S3.
+ *
+ */
+
+#include "chipset.h"  /* This module implements chipset functions too */
+#include "common.h"
+#include "console.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "power.h"
+#include "task.h"
+#include "util.h"
+
+/* Console output macros */
+#define CPUTS(outstr) cputs(CC_CHIPSET, outstr)
+#define CPRINTS(format, args...) cprints(CC_CHIPSET, format, ## args)
+
+#define IN_SUSPEND POWER_SIGNAL_MASK(ECDRIVEN_SUSPEND_ASSERTED)
+
+enum power_state power_chipset_init(void)
+{
+	return POWER_S3;
+}
+
+enum power_state power_handle_state(enum power_state state)
+{
+	switch (state) {
+	case POWER_S3:
+		if (!(power_get_signals() & IN_SUSPEND)) {
+			hook_notify(HOOK_CHIPSET_RESUME);
+			return POWER_S0;
+		}
+		return state;
+
+	case POWER_S0:
+		if (power_get_signals() & IN_SUSPEND) {
+			hook_notify(HOOK_CHIPSET_SUSPEND);
+			return POWER_S3;
+		}
+		return state;
+	default:
+		CPRINTS("Unexpected state: $d", state);
+	}
+
+	return state;
+}