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 */