drivers:misc: ti-st: fix error codes

set-right the error codes that the shared transport driver
returns.
Instead of magic numbers like -1, return relevant codes such as
ETIMEDOUT or EIO, EAGAIN when wait times out or uart write bytes don't
match expected value or when registration fails and needs to be
attempted again.

Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/misc/ti-st/st_ll.c b/drivers/misc/ti-st/st_ll.c
index 2bda8dea15b0..f72de6b8c343 100644
--- a/drivers/misc/ti-st/st_ll.c
+++ b/drivers/misc/ti-st/st_ll.c
@@ -130,7 +130,7 @@ unsigned long st_ll_sleep_state(struct st_data_s *st_data,
                 break;
         default:
                 pr_err(" unknown input/state ");
-                return -1;
+                return -EINVAL;
         }
         return 0;
 }