Changes between Version 25 and Version 26 of DeviceDrivers

Timestamp:

2012-01-13T16:30:16Z (12 years ago)

Author:

Jiri Svoboda

Comment:

More about location service

DeviceDrivers

@@ -253 +253 @@
 == Exposing Driver Services to Clients ==
 
-All driver services are provided to clients (applications) via the location service. For each bound exposed function node the device framework creates a service whose name is based on the physical path of that function. The services are created in the ''devices'' namespace. This is mapped to the {{{/loc/devices}}} directory via ''locfs''. For example:
+All driver services are provided to clients (applications) via the location service. As such, they enjoy all benefits of such services, some of which we will note explicitly. For each bound exposed function node the device framework creates a service whose name is based on the physical path of that function. The services are created in the ''devices'' namespace. This is mapped to the {{{/loc/devices}}} directory via ''locfs''. For example:
 
 {{{
@@ -263 +263 @@
 }}}
 
-Often the driver will want to add the function service to one or more service categories. Service categories imply the protocol spoken by a service (and possibly also the intended use). This can be done using the DDF function:
+Each service currently running in the system is uniquely identified by a numerical identifier called ''service ID''. Often the driver will want to add the function service to one or more service categories. Service categories imply the protocol spoken by a service (and possibly also the intended use). This can be done using the DDF function:
 {{{
 int ddf_fun_add_to_category(ddf_fun_t *fun, const char *cat_name)
 }}}
 
-For example, the input server automatically picks up and opens any device in the categories ''keyboard'' and ''mouse''.
+Service consumers can find services by category. They can also register to receive notification when new services are registered. For example, the input server automatically picks up and opens any (device) service in the categories ''keyboard'' and ''mouse''.
 
 == Traditional I/O Device Drivers ==