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 /* 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