1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/eeprom/eeprom_i2c.h b/drivers/eeprom/eeprom_i2c.h
new file mode 100644
index 0000000000..51bce825b0
--- /dev/null
+++ b/drivers/eeprom/eeprom_i2c.h
@@ -0,0 +1,115 @@
+/* Copyright 2019 Nick Brassel (tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/*
+    Default device configurations:
+
+    For the Sparkfun Qwiic I2C EEPROM module: https://www.sparkfun.com/products/14764
+        #define EEPROM_I2C_CAT24C512 // (part number 24512A)
+        #define EEPROM_I2C_RM24C512C // (part number 24512C)
+
+    For the Sparkfun I2C EEPROM chip: https://www.sparkfun.com/products/525
+        #define EEPROM_I2C_24LC256
+
+    For the Adafruit I2C FRAM chip: https://www.adafruit.com/product/1895
+        #define EEPROM_I2C_MB85RC256V
+*/
+#if defined(EEPROM_I2C_CAT24C512)
+#    define EXTERNAL_EEPROM_BYTE_COUNT 65536
+#    define EXTERNAL_EEPROM_PAGE_SIZE 128
+#    define EXTERNAL_EEPROM_ADDRESS_SIZE 2
+#    define EXTERNAL_EEPROM_WRITE_TIME 5
+#elif defined(EEPROM_I2C_RM24C512C)
+#    define EXTERNAL_EEPROM_BYTE_COUNT 65536
+#    define EXTERNAL_EEPROM_PAGE_SIZE 128
+#    define EXTERNAL_EEPROM_ADDRESS_SIZE 2
+#    define EXTERNAL_EEPROM_WRITE_TIME 3
+#elif defined(EEPROM_I2C_24LC256)
+#    define EXTERNAL_EEPROM_BYTE_COUNT 32768
+#    define EXTERNAL_EEPROM_PAGE_SIZE 64
+#    define EXTERNAL_EEPROM_ADDRESS_SIZE 2
+#    define EXTERNAL_EEPROM_WRITE_TIME 5
+#elif defined(EEPROM_I2C_24LC128)
+#    define EXTERNAL_EEPROM_BYTE_COUNT 16384
+#    define EXTERNAL_EEPROM_PAGE_SIZE 64
+#    define EXTERNAL_EEPROM_ADDRESS_SIZE 2
+#    define EXTERNAL_EEPROM_WRITE_TIME 5
+#elif defined(EEPROM_I2C_MB85RC256V)
+#    define EXTERNAL_EEPROM_BYTE_COUNT 32768
+#    define EXTERNAL_EEPROM_PAGE_SIZE 128
+#    define EXTERNAL_EEPROM_ADDRESS_SIZE 2
+#    define EXTERNAL_EEPROM_WRITE_TIME 0
+#endif
+
+/*
+    The base I2C address of the EEPROM.
+    This needs to be shifted up by 1, to match i2c_master requirements.
+*/
+#ifndef EXTERNAL_EEPROM_I2C_BASE_ADDRESS
+#    define EXTERNAL_EEPROM_I2C_BASE_ADDRESS 0b10100000
+#endif
+
+/*
+    The calculated I2C address based on the input memory location.
+
+    For EEPROM chips that embed part of the memory location in the I2C address
+    such as AT24M02 you can use something similar to the following (ensuring the
+    result is shifted by left by 1):
+
+    #define EXTERNAL_EEPROM_I2C_ADDRESS(loc) \
+        (EXTERNAL_EEPROM_I2C_BASE_ADDRESS | ((((loc) >> 16) & 0x07) << 1))
+
+*/
+#ifndef EXTERNAL_EEPROM_I2C_ADDRESS
+#    define EXTERNAL_EEPROM_I2C_ADDRESS(loc) (EXTERNAL_EEPROM_I2C_BASE_ADDRESS)
+#endif
+
+/*
+    The total size of the EEPROM, in bytes. The EEPROM datasheet will usually
+    specify this value in kbits, and will require conversion to bytes.
+*/
+#ifndef EXTERNAL_EEPROM_BYTE_COUNT
+#    define EXTERNAL_EEPROM_BYTE_COUNT 8192
+#endif
+
+/*
+    The page size in bytes of the EEPROM, as specified in the datasheet.
+*/
+#ifndef EXTERNAL_EEPROM_PAGE_SIZE
+#    define EXTERNAL_EEPROM_PAGE_SIZE 32
+#endif
+
+/*
+    The address size in bytes of the EEPROM. For EEPROMs with <=256 bytes, this
+    will likely be 1. For EEPROMs >256 and <=65536, this will be 2. For EEPROMs
+    >65536, this will likely need to be 2 with the modified variant of
+    EXTERNAL_EEPROM_I2C_ADDRESS above.
+
+    As expected, consult the datasheet for specifics of your EEPROM.
+*/
+#ifndef EXTERNAL_EEPROM_ADDRESS_SIZE
+#    define EXTERNAL_EEPROM_ADDRESS_SIZE 2
+#endif
+
+/*
+    The write cycle time of the EEPROM in milliseconds, as specified in the
+    datasheet.
+*/
+#ifndef EXTERNAL_EEPROM_WRITE_TIME
+#    define EXTERNAL_EEPROM_WRITE_TIME 5
+#endif