eeprom.h 1.2 KB

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