dfu: Extract common DFU code to handle "dfu_alt_info" environment variable

New dfu_init_env_entities() function has been extracted from cmd_dfu.c and
stored at dfu core.

This is a dfu centric code, so it shall be processed in the core.

Change-Id: I756c5de922fa31399d8804eaadc004ee98844ec2
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Tested-by: Heiko Schocher <hs@denx.de>

common/cmd_dfu.c

@@ -17,26 +17,15 @@
 
 static int do_dfu(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
-	const char *str_env;
 	char *s = "dfu";
 	int ret, i = 0;
-	char *env_bkp;
 
 	if (argc < 3)
 		return CMD_RET_USAGE;
 
-	str_env = getenv("dfu_alt_info");
+	ret = dfu_init_env_entities(argv[1], simple_strtoul(argv[2], NULL, 10));
-	if (str_env == NULL) {
-		printf("%s: \"dfu_alt_info\" env variable not defined!\n",
-		       __func__);
-		return CMD_RET_FAILURE;
-	}
-
-	env_bkp = strdup(str_env);
-	ret = dfu_config_entities(env_bkp, argv[1],
-			    (int)simple_strtoul(argv[2], NULL, 10));
 	if (ret)
-		return CMD_RET_FAILURE;
+		return ret;
 
 	if (argc > 3 && strcmp(argv[3], "list") == 0) {
 		dfu_show_entities();
@@ -67,7 +56,6 @@ exit:
 	g_dnl_unregister();
 done:
 	dfu_free_entities();
-	free(env_bkp);
 
 	if (dfu_reset())
 		run_command("reset", 0);

drivers/dfu/dfu.c

@@ -41,6 +41,29 @@ static int dfu_find_alt_num(const char *s)
 	return ++i;
 }
 
+int dfu_init_env_entities(char *interface, int dev)
+{
+	const char *str_env;
+	char *env_bkp;
+	int ret;
+
+	str_env = getenv("dfu_alt_info");
+	if (!str_env) {
+		error("\"dfu_alt_info\" env variable not defined!\n");
+		return -EINVAL;
+	}
+
+	env_bkp = strdup(str_env);
+	ret = dfu_config_entities(env_bkp, interface, dev);
+	if (ret) {
+		error("DFU entities configuration failed!\n");
+		return ret;
+	}
+
+	free(env_bkp);
+	return 0;
+}
+
 static unsigned char *dfu_buf;
 static unsigned long dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;
 

include/dfu.h

@@ -113,6 +113,7 @@ struct dfu_entity *dfu_get_entity(int alt);
 char *dfu_extract_token(char** e, int *n);
 void dfu_trigger_reset(void);
 bool dfu_reset(void);
+int dfu_init_env_entities(char *interface, int dev);
 
 int dfu_read(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
 int dfu_write(struct dfu_entity *de, void *buf, int size, int blk_seq_num);