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  */
  13 struct 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         void *context;
  34 };
  35
  36 #endif /* __LINUX_SPI_EEPROM_H */