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

3 files changed, 4 insertions, 4 deletions

diff --git a/components/drivers/include/drivers/audio.h b/components/drivers/include/drivers/audio.h
index d9a7388678..79856a37a8 100644
--- a/components/drivers/include/drivers/audio.h
+++ b/components/drivers/include/drivers/audio.h
@@ -105,7 +105,7 @@ struct rt_audio_ops
     rt_err_t (*init)(struct rt_audio_device *audio);
     rt_err_t (*start)(struct rt_audio_device *audio, int stream);
     rt_err_t (*stop)(struct rt_audio_device *audio, int stream);
-    rt_size_t (*transmit)(struct rt_audio_device *audio, const void *writeBuf, void *readBuf, rt_size_t size);
+    rt_ssize_t (*transmit)(struct rt_audio_device *audio, const void *writeBuf, void *readBuf, rt_size_t size);
     /* get page size of codec or private buffer's info */
     void (*buffer_info)(struct rt_audio_device *audio, struct rt_audio_buf_info *info);
 };
diff --git a/components/drivers/include/drivers/i2c.h b/components/drivers/include/drivers/i2c.h
index 308c344294..3186f13414 100644
--- a/components/drivers/include/drivers/i2c.h
+++ b/components/drivers/include/drivers/i2c.h
@@ -38,10 +38,10 @@ struct rt_i2c_bus_device;
 
 struct rt_i2c_bus_device_ops
 {
-    rt_size_t (*master_xfer)(struct rt_i2c_bus_device *bus,
+    rt_ssize_t (*master_xfer)(struct rt_i2c_bus_device *bus,
                              struct rt_i2c_msg msgs[],
                              rt_uint32_t num);
-    rt_size_t (*slave_xfer)(struct rt_i2c_bus_device *bus,
+    rt_ssize_t (*slave_xfer)(struct rt_i2c_bus_device *bus,
                             struct rt_i2c_msg msgs[],
                             rt_uint32_t num);
     rt_err_t (*i2c_bus_control)(struct rt_i2c_bus_device *bus,
diff --git a/components/drivers/include/drivers/serial.h b/components/drivers/include/drivers/serial.h
index b4c6fb4a7a..e7432b1e1d 100644
--- a/components/drivers/include/drivers/serial.h
+++ b/components/drivers/include/drivers/serial.h
@@ -167,7 +167,7 @@ struct rt_uart_ops
     int (*putc)(struct rt_serial_device *serial, char c);
     int (*getc)(struct rt_serial_device *serial);
 
-    rt_size_t (*dma_transmit)(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction);
+    rt_ssize_t (*dma_transmit)(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction);
 };
 
 void rt_hw_serial_isr(struct rt_serial_device *serial, int event);