Power HAL: Add initial header file and default/legacy implementation
Change-Id: I43a515a8ffe72a9c4e7d5f7470a5e73e76d5e1b1
Signed-off-by: Todd Poynor <toddpoynor@google.com>
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,
+};