Import of the watch repository from Pebble

src/fw/drivers/ambient_light.h

@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+//! Light level enum
+typedef enum AmbientLightLevel {
+  AmbientLightLevelUnknown = 0,
+  AmbientLightLevelVeryDark,
+  AmbientLightLevelDark,
+  AmbientLightLevelLight,
+  AmbientLightLevelVeryLight,
+} AmbientLightLevel;
+
+#define AMBIENT_LIGHT_LEVEL_ENUM_COUNT (AmbientLightLevelVeryLight + 1)
+
+static const uint32_t AMBIENT_LIGHT_LEVEL_MAX  = 4096;   // max 12 bits
+
+/** Initialize the ambient light sensor */
+void ambient_light_init(void);
+
+/** get the ambient light level scaled between 0 and AMBIENT_LIGHT_LEVEL_MAX
+ */
+uint32_t ambient_light_get_light_level(void);
+
+//! get the threshold between light and dark
+uint32_t ambient_light_get_dark_threshold(void);
+
+//! set the threshold between light and dark
+void ambient_light_set_dark_threshold(uint32_t new_threshold);
+
+//! figure out whether it is light outside
+bool ambient_light_is_light();
+
+//! Convert a light level obtained from ambient_light_get_light_level() into an
+//! AmbientLightLevel enum value.
+//! @param[in] light_level the raw light level reading obtained from ambient_light_get_light_level
+AmbientLightLevel ambient_light_level_to_enum(uint32_t light_level);