dfu: Add optional timeout parameter

When the `dfu` command is called from the U-Boot environment,
it now accepts an optional parameter that specifies a timeout (in seconds).
If a DFU connection is not made within that time the `dfu` command exits
(as it would if Ctrl+C was pressed). If the timeout is left empty or being
zero the `dfu` command behaves as it does now.

This is useful for allowing U-Boot to check to see if anything wants to
upload new firmware before continuing to boot.

The patch is based on the commit
https://github.com/01org/edison-u-boot/commit/5e966ccc3c65c18c9783741fa04e0c45e021780c
by Sebastien Colleur, which has been heavily reworked due to U-Boot changes
in the past.

Signed-off-by: Brad Campbell <bradjc5@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index 38aecd3a05..df50196dfd 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -21,6 +21,9 @@ static LIST_HEAD(dfu_list);
 static int dfu_alt_num;
 static int alt_num_cnt;
 static struct hash_algo *dfu_hash_algo;
+#ifdef CONFIG_DFU_TIMEOUT
+static unsigned long dfu_timeout = 0;
+#endif
 
 /*
  * The purpose of the dfu_flush_callback() function is to
@@ -58,6 +61,18 @@ __weak bool dfu_usb_get_reset(void)
 #endif
 }
 
+#ifdef CONFIG_DFU_TIMEOUT
+void dfu_set_timeout(unsigned long timeout)
+{
+	dfu_timeout = timeout;
+}
+
+unsigned long dfu_get_timeout(void)
+{
+	return dfu_timeout;
+}
+#endif
+
 static int dfu_find_alt_num(const char *s)
 {
 	int i = 0;