Add the current ideas about pictograms.

docs/pictogram-spec.docbook

@@ -41,7 +41,98 @@ term <termdef>pictogram</termdef> has been chosen.</para></note>
 </sect1>
 
 <sect1><title>Client language</title>
-<para>This section should talk about the client language.</para>
+<para>
+    There are two language commands that can be called by the client:
+    pictograms_get and pictogram_set.
+</para>
+
+<variablelist>
+    <varlistentry>
+	<term>
+	    <command>pictograms_get</command>
+	</term>
+	<listitem>
+	    <para>This command may be called by a client to get a list of
+	    available pictograms. If pictograms are not support by the
+	    particular version of LCDd, it will respond with an error
+	    message (huh? unknown command).</para>
+
+	    <note>
+		<para>Clients should either check the version number returned as
+		response to the 'hello' command or the response to
+		'pictograms_get' to check if LCDd supports pictograms before
+		calling 'pictogram_set' (see below).</para>
+	    </note>
+
+	    <para>
+	      The response will be a string in the format:
+	    </para>
+	    <para>
+	      <computeroutput>pictograms <replaceable>pictogram list</replaceable>...</computeroutput>
+	    </para>
+	    <para>
+		The pictogram list will be a sequence of pictogram
+		definitions separated by a space character. Each pictogram
+		definition consists of up to four fields separated by a colon.
+
+		<variablelist>
+		    <varlistentry>
+			<term>
+			    <computeroutput><replaceable>Name</replaceable></computeroutput>
+			</term>
+			<listitem><para>
+			    The text representation of the pictogram name.
+			</para></listitem>
+		    </varlistentry>
+		    <varlistentry>
+			<term>
+			    <computeroutput><replaceable>Type</replaceable></computeroutput>
+			</term>
+			<listitem><para>
+			    The type of the pictogram: 'n' for numerical pictograms
+			    and 'b' for boolean type pictograms.
+			</para></listitem>
+		    </varlistentry>
+		    <varlistentry>
+			<term>
+			    <computeroutput><replaceable>Group ID</replaceable></computeroutput>
+			</term>
+			<listitem>
+			    <para>The Group ID is optional and if present is a number greater than zero
+			    that models the driver's idea of a several pictograms that form a group. This
+			    may e.g. be used for media source pictograms.</para>
+			    <note>
+				<para>The group ID is only informational for the client and is not used
+				within LCDd. The driver however may make use of groups internally.</para>
+			    </note>
+			</listitem>
+		    </varlistentry>
+		    <varlistentry>
+			<term>
+			    <computeroutput><replaceable>Group type</replaceable></computeroutput>
+			</term>
+			<listitem><para>
+
+			</para></listitem>
+		    </varlistentry>
+		</variablelist>
+	    </para>
+
+	</listitem>
+    </varlistentry>
+    <varlistentry>
+	<term>
+	    <command>pictogram_set
+		<option><replaceable>pictogram</replaceable>:<replaceable>value</replaceable></option>
+	    </command>
+	</term>
+	<listitem>
+		<para>
+		</para>
+	</listitem>
+    </varlistentry>
+</variablelist>
+
 </sect1>
 
 <sect1><title>Driver API</title>

server/drivers/t6963_low.h

@@ -77,7 +77,7 @@
 #define AUTO_READ	0xb1
 #define AUTO_RESET	0xb2
 
-/* 'Status read' anwer codes */
+/* 'Status read' answer codes */
 #define STA0		0x01
 #define STA1		0x02
 #define STA3		0x08