1 #ifndef _LINUX_AT24_H
2 #define _LINUX_AT24_H
3 
4 #include <linux/types.h>
5 #include <linux/memory.h>
6 
7 /*
8  * As seen through Linux I2C, differences between the most common types of I2C
9  * memory include:
10  * - How much memory is available (usually specified in bit)?
11  * - What write page size does it support?
12  * - Special flags (16 bit addresses, read_only, world readable...)?
13  *
14  * If you set up a custom eeprom type, please double-check the parameters.
15  * Especially page_size needs extra care, as you risk data loss if your value
16  * is bigger than what the chip actually supports!
17  */
18 
19 struct at24_platform_data {
20 	u32		byte_len;		/* size (sum of all addr) */
21 	u16		page_size;		/* for writes */
22 	u8		flags;
23 #define AT24_FLAG_ADDR16	0x80	/* address pointer is 16 bit */
24 #define AT24_FLAG_READONLY	0x40	/* sysfs-entry will be read-only */
25 #define AT24_FLAG_IRUGO		0x20	/* sysfs-entry will be world-readable */
26 #define AT24_FLAG_TAKE8ADDR	0x10	/* take always 8 addresses (24c00) */
27 
28 	void		(*setup)(struct memory_accessor *, void *context);
29 	void		*context;
30 };
31 
32 #endif /* _LINUX_AT24_H */
33