applications: nrf_desktop: generic max report size handling

Handle max input and output report size in scalable way.

Signed-off-by: Pawel Dunaj <pawel.dunaj@nordicsemi.no>

Author: pdunaj

applications/nrf_desktop/configuration/common/hid_report_desc.h

@@ -84,35 +84,38 @@ static const uint8_t output_reports[] = {
 	REPORT_ID_KEYBOARD_LEDS,
 };
 
-/* Internal definitions used to calculate size of the biggest supported HID input report. */
-#define _REPORT_BUFFER_SIZE_MOUSE \
-	(IS_ENABLED(CONFIG_DESKTOP_HID_REPORT_MOUSE_SUPPORT) ? (REPORT_SIZE_MOUSE) : (0))
-#define _REPORT_BUFFER_SIZE_KEYBOARD_KEYS \
-	(IS_ENABLED(CONFIG_DESKTOP_HID_REPORT_KEYBOARD_SUPPORT) ? (REPORT_SIZE_KEYBOARD_KEYS) : (0))
-#define _REPORT_BUFFER_SIZE_SYSTEM_CTRL								\
-	(IS_ENABLED(CONFIG_DESKTOP_HID_REPORT_SYSTEM_CTRL_SUPPORT) ?				\
-	 (REPORT_SIZE_SYSTEM_CTRL) : (0))
-#define _REPORT_BUFFER_SIZE_CONSUMER_CTRL							\
-	(IS_ENABLED(CONFIG_DESKTOP_HID_REPORT_CONSUMER_CTRL_SUPPORT) ?				\
-	 (REPORT_SIZE_CONSUMER_CTRL) : (0))
-#define _REPORT_BUFFER_SIZE_BOOT_MOUSE \
-	(IS_ENABLED(CONFIG_DESKTOP_HID_BOOT_INTERFACE_MOUSE) ? (REPORT_SIZE_MOUSE_BOOT) : (0))
-#define _REPORT_BUFFER_SIZE_BOOT_KEYBOARD \
-	(IS_ENABLED(CONFIG_DESKTOP_HID_BOOT_INTERFACE_KEYBOARD) ? (REPORT_SIZE_KEYBOARD_BOOT) : (0))
-#define _MAX6(a, b, c, d, e, f)	MAX(MAX(a, b), MAX(MAX(c, d), MAX(e, f)))
+union _input_report_size_max {
+#if CONFIG_DESKTOP_HID_REPORT_MOUSE_SUPPORT || CONFIG_DESKTOP_HID_BOOT_INTERFACE_MOUSE
+	uint8_t _mouse_report[REPORT_SIZE_MOUSE];
+#endif
+#if CONFIG_DESKTOP_HID_REPORT_KEYBOARD_SUPPORT || CONFIG_DESKTOP_HID_BOOT_INTERFACE_KEYBOARD
+	uint8_t _keyboard_report[REPORT_SIZE_KEYBOARD_KEYS];
+#endif
+#if CONFIG_DESKTOP_HID_REPORT_SYSTEM_CTRL_SUPPORT
+	uint8_t _sysctrl_report[REPORT_SIZE_SYSTEM_CTRL];
+#endif
+#if CONFIG_DESKTOP_HID_REPORT_CONSUMER_CTRL_SUPPORT
+	uint8_t _consumerctrl_report[REPORT_SIZE_CONSUMER_CTRL];
+#endif
+#if CONFIG_DESKTOP_HID_BOOT_INTERFACE_MOUSE
+	uint8_t _boot_mouse_report[REPORT_SIZE_MOUSE_BOOT];
+#endif
+#if CONFIG_DESKTOP_HID_BOOT_INTERFACE_KEYBOARD
+	uint8_t _boot_keyboard_report[REPORT_SIZE_KEYBOARD_BOOT];
+#endif
+};
 
-/* Size of the biggest supported HID input report that is part of input reports map. */
-#define REPORT_BUFFER_SIZE_INPUT_REPORT								\
-	_MAX6(_REPORT_BUFFER_SIZE_MOUSE, _REPORT_BUFFER_SIZE_KEYBOARD_KEYS,			\
-	      _REPORT_BUFFER_SIZE_SYSTEM_CTRL, _REPORT_BUFFER_SIZE_CONSUMER_CTRL,		\
-	      _REPORT_BUFFER_SIZE_BOOT_MOUSE, _REPORT_BUFFER_SIZE_BOOT_KEYBOARD)
+union _output_report_size_max {
+#if CONFIG_DESKTOP_HID_REPORT_KEYBOARD_SUPPORT
+	uint8_t _keyboard_report[REPORT_SIZE_KEYBOARD_LEDS];
+#endif
+};
 
-/* Internal definitions used to calculate size of the biggest supported HID output report. */
-#define _REPORT_BUFFER_SIZE_KEYBOARD_LEDS \
-	(IS_ENABLED(CONFIG_DESKTOP_HID_REPORT_KEYBOARD_SUPPORT) ? (REPORT_SIZE_KEYBOARD_LEDS) : (0))
+/* Size of the biggest supported HID input report that is part of input reports map. */
+#define REPORT_BUFFER_SIZE_INPUT_REPORT	sizeof(union _input_report_size_max)
 
 /* Size of the biggest supported HID output report that is part of output reports map. */
-#define REPORT_BUFFER_SIZE_OUTPUT_REPORT	_REPORT_BUFFER_SIZE_KEYBOARD_LEDS
+#define REPORT_BUFFER_SIZE_OUTPUT_REPORT sizeof(union _output_report_size_max)
 
 extern const uint8_t hid_report_desc[];
 extern const size_t hid_report_desc_size;