rt_device_write/read return data type as rt_ssize_t

rt_ssize_t can give negative error code, which follows the unix style correctly

1 files changed, 2 insertions, 2 deletions

diff --git a/components/drivers/misc/pin.c b/components/drivers/misc/pin.c
index 91913dccfd..a5a5addafe 100644
--- a/components/drivers/misc/pin.c
+++ b/components/drivers/misc/pin.c
@@ -13,7 +13,7 @@
 #include <drivers/pin.h>
 
 static struct rt_device_pin _hw_pin;
-static rt_size_t _pin_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
+static rt_ssize_t _pin_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
 {
     struct rt_device_pin_status *status;
     struct rt_device_pin *pin = (struct rt_device_pin *)dev;
@@ -29,7 +29,7 @@ static rt_size_t _pin_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_
     return size;
 }
 
-static rt_size_t _pin_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+static rt_ssize_t _pin_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
 {
     struct rt_device_pin_status *status;
     struct rt_device_pin *pin = (struct rt_device_pin *)dev;