include/linux/spi/eeprom.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_SPI_EEPROM_H
   3 #define __LINUX_SPI_EEPROM_H
   4
   5 #include <linux/memory.h>
   6
   7 /*
   8  * Put one of these structures in platform_data for SPI EEPROMS handled
   9  * by the "at25" driver.  On SPI, most EEPROMS understand the same core
  10  * command set.  If you need to support EEPROMs that don't yet fit, add
  11  * flags to support those protocol options.  These values all come from
  12  * the chip datasheets.
  13  */
  14 struct spi_eeprom {
  15         u32             byte_len;
  16         char            name[10];
  17         u16             page_size;              /* for writes */
  18         u16             flags;
  19 #define EE_ADDR1        0x0001                  /*  8 bit addrs */
  20 #define EE_ADDR2        0x0002                  /* 16 bit addrs */
  21 #define EE_ADDR3        0x0004                  /* 24 bit addrs */
  22 #define EE_READONLY     0x0008                  /* disallow writes */
  23
  24         /*
  25          * Certain EEPROMS have a size that is larger than the number of address
  26          * bytes would allow (e.g. like M95040 from ST that has 512 Byte size
  27          * but uses only one address byte (A0 to A7) for addressing.) For
  28          * the extra address bit (A8, A16 or A24) bit 3 of the instruction byte
  29          * is used. This instruction bit is normally defined as don't care for
  30          * other AT25 like chips.
  31          */
  32 #define EE_INSTR_BIT3_IS_ADDR   0x0010
  33
  34         void *context;
  35 };
  36
  37 #endif /* __LINUX_SPI_EEPROM_H */