s3c24xx: use COMMAND_HANDLER with command helper

Add S3C24XX_DEVICE_COMMAND macros to abstract common command handler
conventions.

src/flash/s3c2410_nand.c

@@ -35,11 +35,7 @@ static int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *
 				struct nand_device_s *nand)
 {
 	s3c24xx_nand_controller_t *info;
-
-	info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, nand);
-	if (info == NULL) {
-		return ERROR_NAND_DEVICE_INVALID;
-	}
+	CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
 
 	/* fill in the address fields for the core device */
 	info->cmd = S3C2410_NFCMD;

src/flash/s3c2412_nand.c

@@ -35,11 +35,7 @@ static int s3c2412_nand_device_command(struct command_context_s *cmd_ctx, char *
 				struct nand_device_s *nand)
 {
 	s3c24xx_nand_controller_t *info;
-
-	info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, nand);
-	if (info == NULL) {
-		return ERROR_NAND_DEVICE_INVALID;
-	}
+	CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
 
 	/* fill in the address fields for the core device */
 	info->cmd = S3C2440_NFCMD;

src/flash/s3c2440_nand.c

@@ -36,11 +36,7 @@ static int s3c2440_nand_device_command(struct command_context_s *cmd_ctx, char *
 				struct nand_device_s *nand)
 {
 	s3c24xx_nand_controller_t *info;
-
-	info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, nand);
-	if (info == NULL) {
-		return ERROR_NAND_DEVICE_INVALID;
-	}
+	CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
 
 	/* fill in the address fields for the core device */
 	info->cmd = S3C2440_NFCMD;

src/flash/s3c2443_nand.c

@@ -36,11 +36,7 @@ static int s3c2443_nand_device_command(struct command_context_s *cmd_ctx, char *
 				struct nand_device_s *nand)
 {
 	s3c24xx_nand_controller_t *info;
-
-	info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, nand);
-	if (info == NULL) {
-		return ERROR_NAND_DEVICE_INVALID;
-	}
+	CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
 
 	/* fill in the address fields for the core device */
 	info->cmd = S3C2440_NFCMD;

src/flash/s3c24xx_nand.c

@@ -31,17 +31,14 @@
 #include "s3c24xx_nand.h"
 
 
-s3c24xx_nand_controller_t *
-s3c24xx_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
-			    char **args, int argc,
-			    struct nand_device_s *nand)
+S3C24XX_DEVICE_COMMAND()
 {
 	s3c24xx_nand_controller_t *s3c24xx_info;
 
 	s3c24xx_info = malloc(sizeof(s3c24xx_nand_controller_t));
 	if (s3c24xx_info == NULL) {
 		LOG_ERROR("no memory for nand controller\n");
-		return NULL;
+		return -ENOMEM;
 	}
 
 	nand->controller_priv = s3c24xx_info;
@@ -49,10 +46,10 @@ s3c24xx_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
 	s3c24xx_info->target = get_target(args[1]);
 	if (s3c24xx_info->target == NULL) {
 		LOG_ERROR("target '%s' not defined", args[1]);
-		return NULL;
+		return ERROR_COMMAND_SYNTAX_ERROR;
 	}
 
-	return s3c24xx_info;
+	return ERROR_OK;
 }
 
 int s3c24xx_register_commands(struct command_context_s *cmd_ctx)

src/flash/s3c24xx_nand.h

@@ -45,9 +45,19 @@ typedef struct s3c24xx_nand_controller_s
 #undef S3C2410_NFREG
 #define S3C2410_NFREG(x) ((x) + 0x4e000000)
 
-s3c24xx_nand_controller_t *s3c24xx_nand_device_command(
-			struct command_context_s *cmd_ctx, char *cmd,
-			char **args, int argc, struct nand_device_s *nand);
+#define S3C24XX_DEVICE_COMMAND() \
+		COMMAND_HELPER(s3c24xx_nand_device_command, \
+				struct nand_device_s *nand, \
+				s3c24xx_nand_controller_t **info)
+
+S3C24XX_DEVICE_COMMAND();
+
+#define CALL_S3C24XX_DEVICE_COMMAND(d, i) \
+	do { \
+		int retval = CALL_COMMAND_HANDLER(s3c24xx_nand_device_command, d, i); \
+		if (ERROR_OK != retval) \
+			return retval; \
+	} while (0)
 
 int s3c24xx_register_commands(struct command_context_s *cmd_ctx);