Add support for generic EEPROM access via a character driver. Add also the EEPROM driver itself. From Sebastien Lorquet

drivers/Kconfig

@@ -207,6 +207,17 @@ menuconfig SPI
 
 if SPI
 source drivers/spi/Kconfig
+
+menuconfig SPI_EEPROM
+	bool "SPI EEPROM support"
+	default n
+	---help---
+		This directory holds implementations of SPI EEPROM drivers
+
+if SPI_EEPROM
+source drivers/eeprom/Kconfig
+endif
+
 endif # SPI
 
 menuconfig I2S

drivers/Makefile

@@ -52,6 +52,7 @@ VPATH = .
 include analog$(DELIM)Make.defs
 include audio$(DELIM)Make.defs
 include bch$(DELIM)Make.defs
+include eeprom$(DELIM)Make.defs
 include input$(DELIM)Make.defs
 include lcd$(DELIM)Make.defs
 include mmcsd$(DELIM)Make.defs

drivers/eeprom/Kconfig

@@ -0,0 +1,21 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+config SPI_EE_25XX
+	bool "Microchip 25xxNNN / Atmel AT25NNN EEPROM devices"
+	default n
+	depends on SPI_EEPROM
+	---help---
+		This selection enables support for the Microchip/Atmel SPI EEPROM
+		devices
+
+if SPI_EE_25XX
+
+config EE25XX_SPIMODE
+	int "SPI mode (0-3)"
+	default 0
+	depends on SPI_EE_25XX
+
+endif

drivers/eeprom/Make.defs

@@ -0,0 +1,46 @@
+############################################################################
+# drivers/eeprom/Make.defs
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+############################################################################
+
+ifneq ($(CONFIG_SPI_EE_25XX),0)
+
+# Include the Microchip/Atmel xx25xx driver
+
+CSRCS += spi_xx25xx.c
+
+# Include build support
+
+DEPPATH += --dep-path eeprom
+VPATH += :eeprom
+endif

drivers/mtd/README.txt

@@ -2,8 +2,8 @@ MTD README
 ==========
 
   MTD stands for "Memory Technology Devices".  This directory contains
-  drivers that operate on various memory technoldogy devices and provide an
+  drivers that operate on various memory technology devices and provide an
-  MTD interface.  That MTD interface may then by use by higher level logic
+  MTD interface.  That MTD interface may then be used by higher level logic
   to control access to the memory device.
 
   See include/nuttx/mtd/mtd.h for additional information.

include/nuttx/eeprom/spi_xx25xx.h

@@ -0,0 +1,99 @@
+/****************************************************************************
+ * include/nuttx/eeprom/m25xx.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. 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_M25XX_H
+#define __INCLUDE_NUTTX_EEPROM_M25XX_H 1
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* DO NOT CHANGE ORDER, IT MACHES CODE IN drivers/eeprom/spieeprom.c */
+
+enum eeprom_25xx_e
+{
+  /* Microchip geometries */
+
+  EEPROM_25xx010,
+  EEPROM_25xx020,
+  EEPROM_25xx040,
+  EEPROM_25xx080A, /* 16 bytes pages */
+  EEPROM_25xx080B, /* 32 bytes pages */
+  EEPROM_25xx160A, /* 16 bytes pages */
+  EEPROM_25xx160B, /* 32 bytes pages */
+  EEPROM_25xx320,
+  EEPROM_25xx640,
+  EEPROM_25xx128,
+  EEPROM_25xx256,
+  EEPROM_25xx512,
+  EEPROM_25xx1024,
+
+  /* Atmel geometries */
+
+  EEPROM_AT25010B,
+  EEPROM_AT25020B,
+  EEPROM_AT25040B,
+
+  /* Aliases (devices similar to previously defined ones)*/
+
+  EEPROM_AT25080B  = EEPROM_25xx080B,
+  EEPROM_AT25160B  = EEPROM_25xx160B,
+  EEPROM_AT25320B  = EEPROM_25xx320,
+  EEPROM_AT25640B  = EEPROM_25xx640,
+  EEPROM_AT25128B  = EEPROM_25xx128,
+  EEPROM_AT225256B = EEPROM_25xx256,
+  EEPROM_AT25512   = EEPROM_25xx512,
+  EEPROM_AT25M02   = EEPROM_25xx1024,
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ee25xx_initialize
+ *
+ * Description: Bind a EEPROM driver to an SPI 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 spi_dev_s;
+int ee25xx_initialize(FAR struct spi_dev_s *dev, FAR char *devname,
+                      int devtype, int readonly);
+
+#endif /* __INCLUDE__NUTTX_EEPROM_M25XX_H */
+

include/nuttx/spi/spi.h

@@ -360,7 +360,8 @@ enum spi_dev_e
   SPIDEV_EXPANDER,    /* Select SPI I/O expander device */
   SPIDEV_MUX,         /* Select SPI multiplexer device */
   SPIDEV_AUDIO_DATA,  /* Select SPI audio codec device data port */
-  SPIDEV_AUDIO_CTRL   /* Select SPI audio codec device control port */
+  SPIDEV_AUDIO_CTRL,  /* Select SPI audio codec device control port */
+  SPIDEV_EEPROM       /* Select SPI EEPROM device */
 };
 
 /* Certain SPI devices may required differnt clocking modes */