dfu: Implementation of target reset after communication with dfu-util's -R switch

This patch extends dfu code to support transmission with -R switch
specified at dfu-util.

When -R is specified, the extra USB_REQ_DFU_DETACH request is sent after
successful data transmission. Then dfu resources are released and reset
command is issued.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

common/cmd_dfu.c

@@ -19,8 +19,8 @@ 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;
-	int ret;
 
 	if (argc < 3)
 		return CMD_RET_USAGE;
@@ -49,6 +49,15 @@ static int do_dfu(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 	g_dnl_register(s);
 	while (1) {
+		if (dfu_reset())
+			/*
+			 * This extra number of usb_gadget_handle_interrupts()
+			 * calls is necessary to assure correct transmission
+			 * completion with dfu-util
+			 */
+			if (++i == 10)
+				goto exit;
+
 		if (ctrlc())
 			goto exit;
 
@@ -60,6 +69,9 @@ done:
 	dfu_free_entities();
 	free(env_bkp);
 
+	if (dfu_reset())
+		run_command("reset", 0);
+
 	return CMD_RET_SUCCESS;
 }
 

drivers/dfu/dfu.c

@@ -16,9 +16,20 @@
 #include <linux/list.h>
 #include <linux/compiler.h>
 
+static bool dfu_reset_request;
 static LIST_HEAD(dfu_list);
 static int dfu_alt_num;
 
+bool dfu_reset(void)
+{
+	return dfu_reset_request;
+}
+
+void dfu_trigger_reset()
+{
+	dfu_reset_request = true;
+}
+
 static int dfu_find_alt_num(const char *s)
 {
 	int i = 0;

drivers/usb/gadget/f_dfu.c

@@ -312,6 +312,8 @@ static int state_dfu_idle(struct f_dfu *f_dfu,
 			DFU_STATE_dfuMANIFEST_WAIT_RST;
 		to_runtime_mode(f_dfu);
 		f_dfu->dfu_state = DFU_STATE_appIDLE;
+
+		dfu_trigger_reset();
 		break;
 	default:
 		f_dfu->dfu_state = DFU_STATE_dfuERROR;

include/dfu.h

@@ -109,6 +109,8 @@ const char *dfu_get_dev_type(enum dfu_device_type t);
 const char *dfu_get_layout(enum dfu_layout l);
 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_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);