1 files changed, 82 insertions, 0 deletions
diff --git a/include/hardware/mcu.h b/include/hardware/mcu.h
new file mode 100644
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--- /dev/null
+++ b/include/hardware/mcu.h
@@ -0,0 +1,82 @@
+/*
+ * 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.
+ */
+
+#ifndef ANDROID_INCLUDE_HARDWARE_MCU_H
+#define ANDROID_INCLUDE_HARDWARE_MCU_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <hardware/hardware.h>
+
+__BEGIN_DECLS
+
+#define MCU_MODULE_API_VERSION_0_1  HARDWARE_MODULE_API_VERSION(0, 1)
+
+/*
+ * The id of this module
+ */
+#define MCU_HARDWARE_MODULE_ID "mcu"
+
+/*
+ * MCU message keys passed to (*sendMessage)
+ */
+#define MCU_PARAMETER_MSG_ENABLE_MCU "enable_mcu"
+
+/*
+ * MCU message values passed to (*sendMessage)
+ */
+#define MCU_PARAMETER_ARG_ON "on"
+#define MCU_PARAMETER_ARG_OFF "off"
+
+/*
+ * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
+ * and the fields of this data structure must begin with hw_module_t
+ * followed by module specific information.
+ */
+typedef struct mcu_module {
+    struct hw_module_t common;
+
+    /*
+     * (*init)() performs MCU module setup actions at runtime startup, such
+     * as to initialize an external MCU. This is called only by the MCU HAL
+     * instance loaded by PowerManagerService.
+     *
+     * Returns 0 on success or -errno on error.
+     */
+    int (*init)(struct mcu_module *module);
+
+    /*
+     * (*sendMessage)() passes a message/argument pair to the MCU to execute
+     * a function. msg is NULL-terminated. If arg is text, then arg_len must
+     * reflect the string length. result is a heap-allocated buffer that the
+     * caller must free. If there is no result, then *result will be NULL and
+     * *result_len will be 0.
+     *
+     * Returns 0 on success or -errno in case of error (for example, if the
+     * MCU does not support the specified message.)
+     *
+     */
+    int (*sendMessage)(struct mcu_module *module, const char *msg,
+                        const void *arg, size_t arg_len, void **result,
+                        size_t *result_len);
+
+} mcu_module_t;
+
+__END_DECLS
+
+#endif  // ANDROID_INCLUDE_HARDWARE_MCU_H