root/include/linux/spi/eeprom.h

#ifndef __LINUX_SPI_EEPROM_H
#define __LINUX_SPI_EEPROM_H

/*
 * Put one of these structures in platform_data for SPI EEPROMS handled
 * by the "at25" driver.  On SPI, most EEPROMS understand the same core
 * command set.  If you need to support EEPROMs that don't yet fit, add
 * flags to support those protocol options.  These values all come from
 * the chip datasheets.
 */
struct spi_eeprom {
        u32             byte_len;
        char            name[10];
        u16             page_size;              /* for writes */
        u16             flags;
#define EE_ADDR1        0x0001                  /*  8 bit addrs */
#define EE_ADDR2        0x0002                  /* 16 bit addrs */
#define EE_ADDR3        0x0004                  /* 24 bit addrs */
#define EE_READONLY     0x0008                  /* disallow writes */
};

#endif /* __LINUX_SPI_EEPROM_H */