dfu:cmd: get the default command arguments from environment

This change adds support to store the default DFU cmd line
arguments in the environment.

This is useful for users who usually use the same arguments
for dfu command and do the upgrade frequently.

DFU command use cases:
- dfu <usb ctrl> <if> <dev> [<list>] - use command line args
- dfu [<list>] - take the default command line args from env
And for both - optional list the initialized DFU entities.

To use the default dfu device configuration user should define:
- $dfu_usb_con - e.g. "0"
- $dfu_interface - e.g. "mmc"
- $dfu_device - e.g. "0"

Change-Id: I1c87677c0384a5f5a808ab9b7845d6da6f9ec980
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>

diff --git a/common/cmd_dfu.c b/common/cmd_dfu.c
index 9e020b4..b102b7d 100644 (file)
--- a/common/cmd_dfu.c
+++ b/common/cmd_dfu.c
@@ -15,23 +15,42 @@
 
 static int do_dfu(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
+       char *usb_controller;
+       char *interface;
+       char *devstring;
+       int argv_list = 0;
+       int ret, i = 0;
        bool dfu_reset = false;
 
-       if (argc < 4)
-               return CMD_RET_USAGE;
-
-       char *usb_controller = argv[1];
-       char *interface = argv[2];
-       char *devstring = argv[3];
+       switch (argc) {
+       case 2:
+               argv_list = 1;
+       case 1:
+               usb_controller = strdup(getenv("dfu_usb_con"));
+               interface = strdup(getenv("dfu_interface"));
+               devstring = strdup(getenv("dfu_device"));
 
-       int ret, i = 0;
+               if (!usb_controller || !interface || !devstring) {
+                       puts("DFU: default device environment is not set.\n");
+                       return CMD_RET_USAGE;
+               }
+               break;
+       case 5:
+               argv_list = 4;
+       case 4:
+               usb_controller = argv[1];
+               interface = argv[2];
+               devstring = argv[3];
+               break;
+       default:
+               return CMD_RET_USAGE;
+       }
 
        ret = dfu_init_env_entities(interface, devstring);
        if (ret)
                goto done;
 
-       ret = CMD_RET_SUCCESS;
-       if (argc > 4 && strcmp(argv[4], "list") == 0) {
+       if (argv_list && !strcmp(argv[argv_list], "list")) {
                dfu_show_entities();
                goto done;
        }