nanohub_exports.h

#ifndef _NANOHUB_EXPORTS_H_
#define _NANOHUB_EXPORTS_H_

// Exported symbols available to other kernel modules.
//
// Please add the exported symvers to your module's Makefile:
// all: (MAKE) -C $(KERNEL_SRC) M=$(M) modules ...
//      KBUILD_EXTRA_SYMBOLS="$(OUT_DIR)/../google-modules/nanohub/Module.symvers"
//
// Your module will have a module dependency on nanohub.

#define MAX_MESSAGE_SIZE 255
#define NANOHUB_AUDIO_CHANNEL_ID 16
#define NANOHUB_DISPLAY_CHANNEL_ID 17
#define NANOHUB_RENDER_CHANNEL_ID 18
#define NANOHUB_DEBUG_LOG_CHANNEL_ID 19
#define NANOHUB_METRICS_CHANNEL_ID 20
#define NANOHUB_CONSOLE_CHANNEL_ID 21
#define NANOHUB_RPC0_CHANNEL_ID 22
#define NANOHUB_RPC1_CHANNEL_ID 23
#define NANOHUB_BRIGHTNESS_CHANNEL_ID 24
#define NANOHUB_TOUCH_CHANNEL_ID 25
#define NANOHUB_DISPLAY_KERNEL_CHANNEL_ID 26

/**
 * Sends a message over a nanohub channel.
 *
 * Remote delivery and dispatch of the entire buffer is guaranteed on successful
 * return.
 *
 * Returns the size of the buffer transferred, or an error if < 0.
 */
extern ssize_t nanohub_send_message(int channel_id, const char *buffer,
                                    size_t length);

/**
 * Register a message listener of a nanohub channel.
 *
 * on_message_received callback will be invoked when nanohub receives a new message
 * from MCU on that channel.
 */
extern void nanohub_register_listener(
	int channel_id,
	void (*on_message_received)(const char *buffer, size_t length));

/**
 * Unregister the message listener of a nanohub channel.
 */
extern void nanohub_unregister_listener(int channel_id);

/**
 * MCU display power state returned from nanohub_query_display_state
 */
enum mcu_display_mode {
	MCU_DISPLAY_NONE = 0,
	MCU_DISPLAY_INIT = 1,
	MCU_DISPLAY_SLEEP = 2,
	MCU_DISPLAY_OFF = 3,
	MCU_DISPLAY_IDLE = 4,
	MCU_DISPLAY_ON = 5,
	MCU_DISPLAY_HIGH_BRIGHTNESS = 6,
};

/**
 * Query the display power state from MCU when display is controlled by MCU.
 * MCU_DISPLAY_NONE, when MCU doesn't control display.
 */

extern int nanohub_query_display_state(void);

#endif /* _NANOHUB_EXPORTS_H_ */