jtag: adapter: move adapter_driver extern declaration to header file

Prevents sparse warning:
"symbol 'adapter_driver' was not declared. Should it be static?"

Change-Id: I2a650ae09e250373132bdfa18f7b2942b970b98e
Signed-off-by: Samuel Obuch <samuel.obuch@espressif.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/9534
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

src/jtag/adapter.h

@@ -129,6 +129,8 @@ const char *adapter_gpio_get_name(enum adapter_gpio_config_index idx);
  */
 const struct adapter_gpio_config *adapter_gpio_get_config(void);
 
+extern struct adapter_driver *adapter_driver;
+
 #define ADAPTER_GPIO_NOT_SET UINT_MAX
 
 #endif /* OPENOCD_JTAG_ADAPTER_H */

src/jtag/core.c

@@ -115,8 +115,6 @@ struct jtag_event_callback {
 /* callbacks to inform high-level handlers about JTAG state changes */
 static struct jtag_event_callback *jtag_event_callbacks;
 
-extern struct adapter_driver *adapter_driver;
-
 void jtag_set_flush_queue_sleep(int ms)
 {
 	jtag_flush_queue_sleep = ms;

src/jtag/swim.c

@@ -12,13 +12,12 @@
 #include "config.h"
 #endif
 
+#include "adapter.h"
 #include "interface.h"
 #include "swim.h"
 #include <helper/command.h>
 #include <transport/transport.h>
 
-extern struct adapter_driver *adapter_driver;
-
 int swim_system_reset(void)
 {
 	assert(adapter_driver->swim_ops);

src/target/adi_v5_swd.c

@@ -39,6 +39,7 @@
 #include <helper/time_support.h>
 
 #include <transport/transport.h>
+#include <jtag/adapter.h>
 #include <jtag/interface.h>
 
 #include <jtag/swd.h>
@@ -722,8 +723,6 @@ static const struct command_registration swd_handlers[] = {
 
 static int swd_select(struct command_context *ctx)
 {
-	/* FIXME: only place where global 'adapter_driver' is still needed */
-	extern struct adapter_driver *adapter_driver;
 	const struct swd_driver *swd = adapter_driver->swd_ops;
 	int retval;
 

src/target/arm_dap.c

@@ -16,12 +16,11 @@
 #include "helper/list.h"
 #include "helper/command.h"
 #include "transport/transport.h"
+#include "jtag/adapter.h"
 #include "jtag/interface.h"
 
 static OOCD_LIST_HEAD(all_dap);
 
-extern struct adapter_driver *adapter_driver;
-
 /* DAP command support */
 struct arm_dap_object {
 	struct list_head lh;

src/target/stm8.c

@@ -13,6 +13,7 @@
 #include <helper/log.h>
 #include "target.h"
 #include "target_type.h"
+#include "jtag/adapter.h"
 #include "jtag/interface.h"
 #include "jtag/jtag.h"
 #include "jtag/swim.h"
@@ -33,7 +34,6 @@ static void stm8_enable_watchpoints(struct target *target);
 static int stm8_unset_watchpoint(struct target *target,
 		struct watchpoint *watchpoint);
 static int (*adapter_speed)(int speed);
-extern struct adapter_driver *adapter_driver;
 
 static const struct {
 	unsigned int id;