[U-Boot] [PATCH] gpio: return success if value is positiv

[Stefan Agner]

Currently we return the GPIO value directly as command exit code.
In shell exit codes, 0 means success. Hence if a GPIO is one, we
actually return a "failure". Fix this by returning SUCCESS if the
value is positive.

This allows to implement scripts more naturally e.g.:
if gpio input 47; then echo "Pressed"; else echo "Not pressed"; fi

Signed-off-by: Stefan Agner <stefan at agner.ch>
---
Not sure if it is the right thing to do to change that, maybe there
are a lot of users which rely on that output already?

It just feels a bit more natural to me when using the command in
scripts...

--
Stefan

 common/cmd_gpio.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/common/cmd_gpio.c b/common/cmd_gpio.c
index 65d6df4..ed735bd 100644
--- a/common/cmd_gpio.c
+++ b/common/cmd_gpio.c
@@ -208,7 +208,10 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (ret != -EBUSY)
 		gpio_free(gpio);
 
-	return value;
+	if (value)
+		return CMD_RET_SUCCESS;
+	else
+		return CMD_RET_FAILURE;
 }
 
 U_BOOT_CMD(gpio, 4, 0, do_gpio,
-- 
2.6.2