[i2c] Need help to write I2C EEPROM device driver

[Sachin Rane]

Hi,
 
I am looking for an information to write a device driver to access EEPROM IC M24C02-WBN6.
The EEPROM IC M24C02-WBN is present on the 'ppc440' evaluation board for boot strap purpose.
 
I have refferred materials available on:
1. some of the material available on www.lm-sensors.org site
2. Device Driver code for EEPOM IC available on http://lists.lm-sensors.org/pipermail/lm-sensors/2005-July/013021.html
3. The documents available in "/usr/src/linux/Documentation/i2c" directory.
4. I2C Drivers, Part I  --> http://www.linuxjournal.com/node/7136/print
   I2C Drivers, Part II  --> http://www.linuxjournal.com/node/7252/print
5. Data sheet of IC M24C02-WBN6
6. I2C protocol document (Philips)
 
But I am not getting a proper link which can help me to write a device driver.
 
Could you  give me answer to my (silly) queries?
 
Q1. Which way is more appropiate to access a EEPOM chip?
      ---- a. Accessing through Adapter device driver (adpter driver in turn will acess the chip device driver)
      ---- b. Or a /dev/ character device file node for the EEPROM IC (by registering a charcter device driver)
      As the IC is laying on the I2C bus with the Read (0xA0) and write(0xA1) address, I have to access it through Adapter device driver only. 

Q2. As there are two address available for read and Write operation, at which address location the the i2c_probe() will find the device?
 
Q3. Can I use i2c_smbus_XXXXXXX functions to do interaction with the EEPROM I2C?
    ---- As per my understanding it should  work as SMB is subset of I2C.
 
Q4. Where I can get the purpose of 'command' argument in 'i2c_smbus_XXXX' functions from 'i2c.h'?
      extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
      extern s32 i2c_smbus_write_byte_data(struct i2c_client * client, u8 command, u8 value);
      extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
      extern s32 i2c_smbus_write_word_data(struct i2c_client * client, u8 command, u16 value);
      extern s32 i2c_smbus_write_block_data(struct i2c_client * client, u8 command, u8 length, u8 *values);
       extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,  u8 command, u8 *values);
 
Q4. Is there any guide available on Net for writing a I2C EEMPROM Chip device driver?
 
 
Regards,
Sachin Rane

Links that I have gone through:
http://www.lm-sensors.org/browser/lm-sensors/trunk/doc
http://www.lm-sensors.org/browser/lm-sensors/trunk
http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/developers
http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/chips/adm1024
http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/developers
http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/developers/new_drivers
http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/FAQ
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/doc
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eeprom
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eeprom/ddcmon
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eepromer
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eepromer/24cXX.c
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eepromer/eeprom.c
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eepromer/README
http://www.lm-sensors.org/browser/lm-sensors/trunk/prog/eepromer/README.eeprom
http://www.lm-sensors.org/wiki/Devices
http://www.lm-sensors.org/wiki/Documentation

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