Some USB mass storage devices can take a comparatively long time after
vbus is applied until they can be enumerated. Board code can reissue
usb_rescan() to retry enumeration at a later time. It's useful for
board code to check whether any new devices have been detected by a
usb_rescan() call. To facilitate this, have usb_rescan() return the
number of devices found in addition to printing it to the log.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
drivers/usb/core/usb.c | 4 +++-
include/usb/usb.h | 2 +-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 34a0f004f7bb..ed3a96cb9e5e 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -599,7 +599,7 @@ int usb_host_detect(struct usb_host *host)
return 0;
}
-void usb_rescan(void)
+int usb_rescan(void)
{
struct usb_host *host;
int ret;
@@ -613,6 +613,8 @@ void usb_rescan(void)
}
pr_info("%d USB Device(s) found\n", dev_count);
+
+ return dev_count;
}
/*-------------------------------------------------------------------
diff --git a/include/usb/usb.h b/include/usb/usb.h
index 39f475091617..04b433ba73ca 100644
--- a/include/usb/usb.h
+++ b/include/usb/usb.h
@@ -201,7 +201,7 @@ int usb_clear_halt(struct usb_device *dev, int pipe);
int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
int usb_set_interface(struct usb_device *dev, int interface, int alternate);
-void usb_rescan(void);
+int usb_rescan(void);
/* big endian -> little endian conversion */
/* some CPUs are already little endian e.g. the ARM920T */
--
2.30.2
