events: Rework event subsystem (add_event, send_event) to be more versatile.

add_event_ex is added that takes an extra user_data pointer. This pointer is
passed to the callback (add_event and add_event_ex have slightly different
callbacks types). All callbacks also get the event id passed. Events added
with add_event_ex must be removed with remove_event_ex because the user_data
pointer must match in addition to the callback pointer.

On the other add_event is simplified to omit the oneshort parameter which
was almost always false (still there with add_event_ex).

As a side effect the ata_idle_notify callbacks are changed as well, they
do not take a data parameter anymore which was always NULL anyway.

This commit also adds some documentation to events.h

Change-Id: I13e29a0f88ef908f175b376d83550f9e0231f772

1 files changed, 2 insertions, 3 deletions

diff --git a/firmware/logf.c b/firmware/logf.c
index a24a635570..ade5458ca9 100644
--- a/firmware/logf.c
+++ b/firmware/logf.c
@@ -322,7 +322,7 @@ static int logdiskf_push(void *userp, unsigned char c)
     return true;
 }
 
-static void flush_buffer(void* data);
+static void flush_buffer(void);
 
 void _logdiskf(const char* file, const char level, const char *fmt, ...)
 {
@@ -350,9 +350,8 @@ void _logdiskf(const char* file, const char level, const char *fmt, ...)
     register_storage_idle_func(flush_buffer);
 }
 
-static void flush_buffer(void* data)
+static void flush_buffer(void)
 {
-    (void)data;
     int fd;
     if(logdiskfindex < 1)
         return;