drivers/eeprobom: EEPROM driver for AT24xx compatible EEPROMs.

drivers/eeprom/Kconfig

@@ -5,11 +5,11 @@
 
 if EEPROM
 config SPI_EE_25XX
-	bool "Microchip 25xxNNN / Atmel AT25NNN EEPROM devices"
+	bool "Microchip 25xxNNN / Atmel AT25NNN / ST M95NNN SPI EEPROM devices"
 	default n
 	depends on SPI
 	---help---
-		This selection enables support for the Microchip/Atmel SPI EEPROM
+		This selection enables support for the Microchip/Atmel/ST SPI EEPROM
 		devices
 
 if SPI_EE_25XX
@@ -20,4 +20,22 @@ config EE25XX_SPIMODE
 	depends on SPI_EE_25XX
 
 endif # SPI_EE_25XX
+
+config I2C_EE_24XX
+	bool "Microchip 24xxNNN / Atmel AT24NNN / ST M24NNN I2C EEPROM devices"
+	default n
+	depends on I2C
+	---help---
+		This selection enables support for the Microchip/Atmel/ST I2C EEPROM
+		devices
+
+if I2C_EE_24XX
+
+config EE24XX_FREQUENCY
+	int "I2C EEPROM frequency (100000 or 400000)"
+	default 100000
+	depends on I2C_EE_24XX
+
+endif # I2C_EE_24XX
+
 endif # EEPROM

drivers/eeprom/Make.defs

@@ -37,12 +37,18 @@
 
 ifeq ($(CONFIG_EEPROM),y)
 
-# Include the Microchip/Atmel xx25xx driver
+# Include the Microchip/Atmel/ST xx25xx driver for SPI
 
 ifeq ($(CONFIG_SPI_EE_25XX),y)
 CSRCS += spi_xx25xx.c
 endif
 
+# Include the Microchip/Atmel/ST xx24xx driver for I2C
+
+ifeq ($(CONFIG_I2C_EE_24XX),y)
+CSRCS += i2c_xx24xx.c
+endif
+
 # Include build support
 
 DEPPATH += --dep-path eeprom

include/nuttx/eeprom/i2c_xx24xx.h

@@ -0,0 +1,113 @@
+ /****************************************************************************
+ * include/nuttx/eeprom/i2c_xx24xx.h
+ *
+ *   Copyright (C) 2018 Sebastien Lorquet. All rights reserved.
+ *   Author: Sebastien Lorquet <sebastien@lorquet.fr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_EEPROM_I2C_XX24XX_H
+#define __INCLUDE_NUTTX_EEPROM_I2C_XX24XX_H 1
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* DO NOT CHANGE ORDER, IT MACHES CODE IN drivers/eeprom/i2c_xx24xx.c */
+
+enum eeprom_24xx_e
+{
+  /* Microchip geometries */
+
+  EEPROM_24xx00,
+  EEPROM_24xx01,
+  EEPROM_24xx02,
+  EEPROM_24xx04,
+  EEPROM_24xx08,
+  EEPROM_24xx16,
+  EEPROM_24xx32,
+  EEPROM_24xx64,
+  EEPROM_24xx128,
+  EEPROM_24xx256,
+  EEPROM_24xx512,
+  EEPROM_24xx1025,
+  EEPROM_24xx1026,
+
+  /* Atmel geometries - none... */
+
+  /* STM geometries */
+
+  EEPROM_M24C01,
+  EEPROM_M24C02,
+  EEPROM_M24M02,
+
+  /* Aliases (devices similar to previously defined ones) */
+
+  EEPROM_AT24C01   = EEPROM_24xx01,
+  EEPROM_AT24C02   = EEPROM_24xx02,
+  EEPROM_AT24C04   = EEPROM_24xx04,
+  EEPROM_AT24C08   = EEPROM_24xx08,
+  EEPROM_AT24C16   = EEPROM_24xx16,
+  EEPROM_AT24C32   = EEPROM_24xx32,
+  EEPROM_AT24C64   = EEPROM_24xx64,
+  EEPROM_AT24C128  = EEPROM_24xx128,
+  EEPROM_AT24C256  = EEPROM_24xx256,
+  EEPROM_AT24C512  = EEPROM_24xx512,
+  EEPROM_AT24C1024 = EEPROM_24xx1026,
+
+  EEPROM_M24C04    = EEPROM_24xx04,
+  EEPROM_M24C08    = EEPROM_24xx08,
+  EEPROM_M24C16    = EEPROM_24xx16,
+  EEPROM_M24C32    = EEPROM_24xx32,
+  EEPROM_M24C64    = EEPROM_24xx64,
+  EEPROM_M24128    = EEPROM_24xx128,
+  EEPROM_M24256    = EEPROM_24xx256,
+  EEPROM_M24512    = EEPROM_24xx512,
+  EEPROM_M24M01    = EEPROM_24xx1026,
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ee24xx_initialize
+ *
+ * Description: Bind a EEPROM driver to an I2C bus. The user MUST provide
+ * a description of the device geometry, since it is not possible to read
+ * this information from the device (contrary to the SPI flash devices).
+ *
+ ****************************************************************************/
+
+struct i2c_master_s;
+int ee24xx_initialize(FAR struct i2c_master_s *bus, uint8_t devaddr,
+                      FAR char *devname, int devtype, int readonly);
+
+#endif /* __INCLUDE__NUTTX_EEPROM_I2C_XX24XX_H */