Add I2C Slave driver

Signed-off-by: Shoukui Zhang <zhangshoukui@xiaomi.com>

drivers/i2c/CMakeLists.txt

@@ -30,6 +30,10 @@ if(CONFIG_I2C)
     list(APPEND SRCS i2c_bitbang.c)
   endif()
 
+  if(CONFIG_I2C_SLAVE_DRIVER)
+    list(APPEND SRCS i2c_slave_driver.c)
+  endif()
+
   # Include the selected I2C multiplexer drivers
 
   if(CONFIG_I2CMULTIPLEXER_PCA9540BDP)

drivers/i2c/Kconfig

@@ -24,6 +24,30 @@ config I2C_SLAVE
 	bool "I2C Slave"
 	default n
 
+menu "I2C Slave Support"
+
+config I2C_SLAVE_DRIVER
+	bool "I2C Slave driver"
+	default n
+	---help---
+		Enable I2C Slave driver
+
+config I2C_SLAVE_READBUFSIZE
+	int "I2C Slave driver read buffer size"
+	default 32
+	depends on I2C_SLAVE_DRIVER
+	---help---
+		I2C Slave read buffer size
+
+config I2C_SLAVE_WRITEBUFSIZE
+	int "I2C Slave driver write buffer size"
+	default 32
+	depends on I2C_SLAVE_DRIVER
+	---help---
+		I2C Slave write buffer size
+
+endmenu # I2C Slave Support
+
 config I2C_POLLED
 	bool "Polled I2C (no interrupts)"
 	default n

drivers/i2c/Make.defs

@@ -32,6 +32,10 @@ ifeq ($(CONFIG_I2C_BITBANG),y)
 CSRCS += i2c_bitbang.c
 endif
 
+ifeq ($(CONFIG_I2C_SLAVE_DRIVER),y)
+CSRCS += i2c_slave_driver.c
+endif
+
 # Include the selected I2C multiplexer drivers
 
 ifeq ($(CONFIG_I2CMULTIPLEXER_PCA9540BDP),y)

include/nuttx/i2c/i2c_slave.h

@@ -223,6 +223,33 @@ extern "C"
 #define EXTERN extern
 #endif
 
+#ifdef CONFIG_I2C_SLAVE_DRIVER
+
+/****************************************************************************
+ * Name: i2c_slave_register
+ *
+ * Description:
+ *   Register the I2C Slave character device driver as 'devpath'.
+ *
+ * Input Parameters:
+ *   dev   - An instance of the I2C Slave interface to use to communicate
+ *           with the I2C Slave device
+ *   bus   - The I2C Slave bus number. This will be used as the I2C device
+ *           minor number. The I2C Slave character device will be
+ *           registered as /dev/i2cslvN where N is the minor number
+ *   addr  - I2C Slave address
+ *   nbits - The number of address bits provided (7 or 10)
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int i2c_slave_register(FAR struct i2c_slave_s *dev, int bus, int addr,
+                       int nbit);
+
+#endif
+
 #undef EXTERN
 #if defined(__cplusplus)
 }