doc: Add fpi-async section to the docs

doc/libfprint-docs.xml

@@ -43,6 +43,7 @@
     <xi:include href="xml/fpi-dev-img.xml"/>
     <xi:include href="xml/fpi-core.xml"/>
     <xi:include href="xml/fpi-core-img.xml"/>
+    <xi:include href="xml/fpi-async.xml"/>
     <xi:include href="xml/fpi-ssm.xml"/>
     <xi:include href="xml/fpi-poll.xml"/>
     <xi:include href="xml/fpi-img.xml"/>

doc/libfprint-sections.txt

@@ -237,6 +237,25 @@ FP_IMGDRV_SUPPORTS_UNCONDITIONAL_CAPTURE
 fp_img_driver
 </SECTION>
 
+<SECTION>
+<INCLUDE>fpi-async.h</INCLUDE>
+<FILE>fpi-async</FILE>
+fpi_drvcb_capture_started
+fpi_drvcb_capture_stopped
+fpi_drvcb_close_complete
+fpi_drvcb_enroll_stage_completed
+fpi_drvcb_enroll_started
+fpi_drvcb_enroll_stopped
+fpi_drvcb_identify_started
+fpi_drvcb_identify_stopped
+fpi_drvcb_open_complete
+fpi_drvcb_report_capture_result
+fpi_drvcb_report_identify_result
+fpi_drvcb_report_verify_result
+fpi_drvcb_verify_started
+fpi_drvcb_verify_stopped
+</SECTION>
+
 <SECTION>
 <INCLUDE>fpi-img.h</INCLUDE>
 <FILE>fpi-img</FILE>

libfprint/fpi-async.c

@@ -26,6 +26,14 @@
 #include <errno.h>
 #include <glib.h>
 
+/**
+ * SECTION:fpi-async
+ * @title: Asynchronous operations reporting
+ *
+ * Those functions are used by primitive drivers to report back their
+ * current status. Most drivers, imaging ones, do not need to use them.
+ */
+
 /* Drivers call this when device initialisation has completed */
 void fpi_drvcb_open_complete(struct fp_dev *dev, int status)
 {