Import of the watch repository from Pebble

src/fw/applib/battery_state_service.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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 "battery_state_service.h"
+
+#include "event_service_client.h"
+#include "kernel/events.h"
+#include "services/common/event_service.h"
+#include "syscall/syscall.h"
+#include "system/passert.h"
+
+#include "process_state/app_state/app_state.h"
+#include "process_state/worker_state/worker_state.h"
+
+
+// ----------------------------------------------------------------------------------------------------
+static BatteryStateServiceState* prv_get_state(PebbleTask task) {
+  if (task == PebbleTask_Unknown) {
+    task = pebble_task_get_current();
+  }
+
+  if (task == PebbleTask_App) {
+    return app_state_get_battery_state_service_state();
+  } else if (task == PebbleTask_Worker) {
+    return worker_state_get_battery_state_service_state();
+  } else {
+    WTF;
+  }
+}
+
+
+static void do_handle(PebbleEvent *e, void *context) {
+  BatteryStateServiceState *state = prv_get_state(PebbleTask_Unknown);
+  PBL_ASSERTN(state->handler != NULL);
+  state->handler(sys_battery_get_charge_state());
+}
+
+void battery_state_service_init(void) {
+  event_service_init(PEBBLE_BATTERY_STATE_CHANGE_EVENT, NULL, NULL);
+}
+
+void battery_state_service_subscribe(BatteryStateHandler handler) {
+  BatteryStateServiceState *state = prv_get_state(PebbleTask_Unknown);
+  state->handler = handler;
+  event_service_client_subscribe(&state->bss_info);
+}
+
+BatteryChargeState battery_state_service_peek(void) {
+  return (sys_battery_get_charge_state());
+}
+
+void battery_state_service_unsubscribe(void) {
+  BatteryStateServiceState *state = prv_get_state(PebbleTask_Unknown);
+  event_service_client_unsubscribe(&state->bss_info);
+  state->handler = NULL;
+}
+
+void battery_state_service_state_init(BatteryStateServiceState *state) {
+  *state = (BatteryStateServiceState) {
+    .bss_info = {
+      .type = PEBBLE_BATTERY_STATE_CHANGE_EVENT,
+      .handler = &do_handle,
+    },
+  };
+}