[device]修改i2c读写函数返回类型为rt_ssize_t (#7029)

bsp/lpc54114-lite/drivers/drv_i2c.c

@@ -35,7 +35,7 @@ static uint32_t get_i2c_freq(I2C_Type *base)
 
 static rt_ssize_t master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
 {
-    rt_size_t ret = (0);
+    rt_ssize_t ret = (0);
 
     rt_uint32_t index = 0;
     struct lpc_i2c *lpc_i2c = RT_NULL;

components/drivers/i2c/i2c_core.c

@@ -51,11 +51,11 @@ struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name)
     return bus;
 }
 
-rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
+rt_ssize_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
                           struct rt_i2c_msg         msgs[],
                           rt_uint32_t               num)
 {
-    rt_size_t ret;
+    rt_ssize_t ret;
 
     if (bus->ops->master_xfer)
     {
@@ -78,7 +78,7 @@ rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
     {
         LOG_E("I2C bus operation not supported");
 
-        return 0;
+        return -RT_ERROR;
     }
 }
 
@@ -98,17 +98,17 @@ rt_err_t rt_i2c_control(struct rt_i2c_bus_device *bus,
     {
         LOG_E("I2C bus operation not supported");
 
-        return 0;
+        return -RT_ERROR;
     }
 }
 
-rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
+rt_ssize_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
                              rt_uint16_t               addr,
                              rt_uint16_t               flags,
                              const rt_uint8_t         *buf,
                              rt_uint32_t               count)
 {
-    rt_size_t ret;
+    rt_ssize_t ret;
     struct rt_i2c_msg msg;
 
     msg.addr  = addr;
@@ -118,16 +118,16 @@ rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
 
     ret = rt_i2c_transfer(bus, &msg, 1);
 
-    return (ret > 0) ? count : ret;
+    return ret;
 }
 
-rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
+rt_ssize_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
                              rt_uint16_t               addr,
                              rt_uint16_t               flags,
                              rt_uint8_t               *buf,
                              rt_uint32_t               count)
 {
-    rt_size_t ret;
+    rt_ssize_t ret;
     struct rt_i2c_msg msg;
     RT_ASSERT(bus != RT_NULL);
 
@@ -138,11 +138,5 @@ rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
 
     ret = rt_i2c_transfer(bus, &msg, 1);
 
-    return (ret > 0) ? count : ret;
+    return ret;
 }
-
-int rt_i2c_core_init(void)
-{
-    return 0;
-}
-INIT_COMPONENT_EXPORT(rt_i2c_core_init);

components/drivers/include/drivers/i2c.h

@@ -70,18 +70,18 @@ struct rt_i2c_client
 rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
                                     const char               *bus_name);
 struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name);
-rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
+rt_ssize_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
                           struct rt_i2c_msg         msgs[],
                           rt_uint32_t               num);
 rt_err_t rt_i2c_control(struct rt_i2c_bus_device *bus,
                         rt_uint32_t               cmd,
                         rt_uint32_t               arg);
-rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
+rt_ssize_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
                              rt_uint16_t               addr,
                              rt_uint16_t               flags,
                              const rt_uint8_t         *buf,
                              rt_uint32_t               count);
-rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
+rt_ssize_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
                              rt_uint16_t               addr,
                              rt_uint16_t               flags,
                              rt_uint8_t               *buf,