Encapsulate the global "jtag" jtag_interface pointer:

- Add jtag_interface_quit, factored from exit_handler() in openocd.c.
- Remove its extern declaration.
- Add static keyword to its definition.


git-svn-id: svn://svn.berlios.de/openocd/trunk@1952 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/jtag.c

@@ -227,7 +227,7 @@ jtag_interface_t *jtag_interfaces[] = {
 	NULL,
 };
 
-jtag_interface_t *jtag = NULL;
+static jtag_interface_t *jtag = NULL;
 
 /* configuration */
 static jtag_interface_t *jtag_interface = NULL;
@@ -2407,6 +2407,20 @@ static int jtag_init_inner(struct command_context_s *cmd_ctx)
 	return ERROR_OK;
 }
 
+int jtag_interface_quit(void)
+{
+	if (!jtag || !jtag->quit)
+		return ERROR_OK;
+
+	// close the JTAG interface
+	int result = jtag->quit();
+	if (ERROR_OK != result)
+		LOG_ERROR("failed: %d", result);
+
+	return ERROR_OK;
+}
+
+
 int jtag_init_reset(struct command_context_s *cmd_ctx)
 {
 	int retval;

src/jtag/jtag.h

@@ -512,8 +512,6 @@ typedef struct jtag_event_callback_s
 
 extern jtag_event_callback_t* jtag_event_callbacks;
 
-extern jtag_interface_t*      jtag; /* global pointer to configured JTAG interface */
-
 extern int jtag_speed;
 extern int jtag_speed_post_reset;
 
@@ -535,6 +533,9 @@ extern enum reset_types jtag_reset_config;
  */
 extern int  jtag_interface_init(struct command_context_s* cmd_ctx);
 
+/// Shutdown the JTAG interface upon program exit.
+extern int  jtag_interface_quit(void);
+
 /* initialize JTAG chain using only a RESET reset. If init fails,
  * try reset + init.
  */