drivers/presto: Group adapter commands

Use a command group 'presto' with subcommands instead of individual
commands with 'presto_' prefix.

The old commands are still available for backward compatibility but
marked as deprecated.

Change-Id: I883d8d87fd457d29cee8d12cd80f2e6c405e8f42
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6390
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

doc/openocd.texi

@@ -3033,7 +3033,7 @@ parport cable wiggler
 
 @deffn {Interface Driver} {presto}
 ASIX PRESTO USB JTAG programmer.
-@deffn {Config Command} {presto_serial} serial_string
+@deffn {Config Command} {presto serial} serial_string
 Configures the USB serial number of the Presto device to use.
 @end deffn
 @end deffn

src/jtag/drivers/presto.c

@@ -519,9 +519,9 @@ COMMAND_HANDLER(presto_handle_serial_command)
 	return ERROR_OK;
 }
 
-static const struct command_registration presto_command_handlers[] = {
+static const struct command_registration presto_subcommand_handlers[] = {
 	{
-		.name = "presto_serial",
+		.name = "serial",
 		.handler = presto_handle_serial_command,
 		.mode = COMMAND_CONFIG,
 		.help = "Configure USB serial number of Presto device.",
@@ -530,6 +530,17 @@ static const struct command_registration presto_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
+static const struct command_registration presto_command_handlers[] = {
+	{
+		.name = "presto",
+		.mode = COMMAND_ANY,
+		.help = "perform presto management",
+		.chain = presto_subcommand_handlers,
+		.usage = "",
+	},
+	COMMAND_REGISTRATION_DONE
+};
+
 static int presto_jtag_init(void)
 {
 	if (presto_open(presto_serial) != ERROR_OK) {

src/jtag/startup.tcl

@@ -309,4 +309,10 @@ proc parport_toggling_time args {
 	eval parport toggling_time $args
 }
 
+lappend _telnet_autocomplete_skip presto_serial
+proc presto_serial args {
+	echo "DEPRECATED! use 'presto serial' not 'presto_serial'"
+	eval presto serial $args
+}
+
 # END MIGRATION AIDS