Power HAL: Add initial header file and default/legacy implementation

Change-Id: I43a515a8ffe72a9c4e7d5f7470a5e73e76d5e1b1
Signed-off-by: Todd Poynor <toddpoynor@google.com>

2 files changed, 105 insertions, 0 deletions

diff --git a/modules/power/Android.mk b/modules/power/Android.mk
new file mode 100644
index 0000000..50ab221
--- /dev/null
+++ b/modules/power/Android.mk
@@ -0,0 +1,25 @@
+# Copyright (C) 2011 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := power.default
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+LOCAL_SRC_FILES := power.c
+LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/modules/power/power.c b/modules/power/power.c
new file mode 100644
index 0000000..ef3fe94
--- /dev/null
+++ b/modules/power/power.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define LOG_TAG "Legacy PowerHAL"
+#include <utils/Log.h>
+
+#include <hardware/hardware.h>
+#include <hardware/power.h>
+
+/*
+ * This module implements the legacy interface for requesting early
+ * suspend and late resume
+ */
+
+#define LEGACY_SYS_POWER_STATE "/sys/power/state"
+
+static int sPowerStatefd;
+static const char *pwr_states[] = { "mem", "on" };
+
+static void power_init(struct power_module *module)
+{
+    char buf[80];
+
+    sPowerStatefd = open(LEGACY_SYS_POWER_STATE, O_RDWR);
+
+    if (sPowerStatefd < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error opening %s: %s\n", LEGACY_SYS_POWER_STATE, buf);
+    }
+}
+
+static void power_set_interactive(struct power_module *module, int on)
+{
+    char buf[80];
+    int len;
+
+    len = write(sPowerStatefd, pwr_states[!!on], strlen(pwr_states[!!on]));
+    if (len < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error writing to %s: %s\n", LEGACY_SYS_POWER_STATE, buf);
+    }
+}
+
+
+static struct hw_module_methods_t power_module_methods = {
+    .open = NULL,
+};
+
+struct power_module HAL_MODULE_INFO_SYM = {
+    .common = {
+        .tag = HARDWARE_MODULE_TAG,
+        .version_major = 1,
+        .version_minor = 0,
+        .id = POWER_HARDWARE_MODULE_ID,
+        .name = "Default Power HAL",
+        .author = "The Android Open Source Project",
+        .methods = &power_module_methods,
+    },
+
+    .init = power_init,
+    .setInteractive = power_set_interactive,
+};