eeprom.h

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#ifndef __LINUX_SPI_EEPROM_H
#define __LINUX_SPI_EEPROM_H

#include <linux/memory.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 */

    /*
     * Certain EEPROMS have a size that is larger than the number of address
     * bytes would allow (e.g. like M95040 from ST that has 512 Byte size
     * but uses only one address byte (A0 to A7) for addressing.) For
     * the extra address bit (A8, A16 or A24) bit 3 of the instruction byte
     * is used. This instruction bit is normally defined as don't care for
     * other AT25 like chips.
     */
#define EE_INSTR_BIT3_IS_ADDR   0x0010

    /* for exporting this chip's data to other kernel code */
    void (*setup)(struct memory_accessor *mem, void *context);
    void *context;
};

#endif /* __LINUX_SPI_EEPROM_H */