API: Improve glue mid-layer of the API demo application.
- Extend ub_dev_read() and ub_dev_recv() so they return the length actually
read, which allows for better control and error handling (this introduces
additional error code API_ESYSC returned by the glue mid-layer).
- Clean up definitions naming and usage.
- Other minor cosmetics.
Note these changes do not touch the API proper, so the interface between
U-Boot and standalone applications remains unchanged.
Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
diff --git a/include/api_public.h b/include/api_public.h
index d3164f6..5940d81 100644
--- a/include/api_public.h
+++ b/include/api_public.h
@@ -57,6 +57,7 @@
#define API_ENOMEM 3 /* no memory */
#define API_EBUSY 4 /* busy, occupied etc. */
#define API_EIO 5 /* I/O error */
+#define API_ESYSC 6 /* syscall error */
typedef int (*scp_t)(int, int *, ...);