LXR linux/include/linux/spi/eeprom.h

   1#ifndef __LINUX_SPI_EEPROM_H
   2#define __LINUX_SPI_EEPROM_H
   3
   4#include <linux/memory.h>
   5
   6/*
   7 * Put one of these structures in platform_data for SPI EEPROMS handled
   8 * by the "at25" driver.  On SPI, most EEPROMS understand the same core
   9 * command set.  If you need to support EEPROMs that don't yet fit, add
  10 * flags to support those protocol options.  These values all come from
  11 * the chip datasheets.
  12 */
  13struct spi_eeprom {
  14        u32             byte_len;
  15        char            name[10];
  16        u16             page_size;              /* for writes */
  17        u16             flags;
  18#define EE_ADDR1        0x0001                  /*  8 bit addrs */
  19#define EE_ADDR2        0x0002                  /* 16 bit addrs */
  20#define EE_ADDR3        0x0004                  /* 24 bit addrs */
  21#define EE_READONLY     0x0008                  /* disallow writes */
  22
  23        /*
  24         * Certain EEPROMS have a size that is larger than the number of address
  25         * bytes would allow (e.g. like M95040 from ST that has 512 Byte size
  26         * but uses only one address byte (A0 to A7) for addressing.) For
  27         * the extra address bit (A8, A16 or A24) bit 3 of the instruction byte
  28         * is used. This instruction bit is normally defined as don't care for
  29         * other AT25 like chips.
  30         */
  31#define EE_INSTR_BIT3_IS_ADDR   0x0010
  32
  33        /* for exporting this chip's data to other kernel code */
  34        void (*setup)(struct memory_accessor *mem, void *context);
  35        void *context;
  36};
  37
  38#endif /* __LINUX_SPI_EEPROM_H */
  39