kernel-ark/include/linux/i2c/at24.h
Wolfram Sang 2b7a5056a0 i2c: New-style EEPROM driver using device IDs
Add a new-style driver for most I2C EEPROMs, giving sysfs read/write
access to their data. Tested with various chips and clock rates.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-14 22:38:35 +02:00

29 lines
982 B
C

#ifndef _LINUX_AT24_H
#define _LINUX_AT24_H
#include <linux/types.h>
/*
* As seen through Linux I2C, differences between the most common types of I2C
* memory include:
* - How much memory is available (usually specified in bit)?
* - What write page size does it support?
* - Special flags (16 bit addresses, read_only, world readable...)?
*
* If you set up a custom eeprom type, please double-check the parameters.
* Especially page_size needs extra care, as you risk data loss if your value
* is bigger than what the chip actually supports!
*/
struct at24_platform_data {
u32 byte_len; /* size (sum of all addr) */
u16 page_size; /* for writes */
u8 flags;
#define AT24_FLAG_ADDR16 0x80 /* address pointer is 16 bit */
#define AT24_FLAG_READONLY 0x40 /* sysfs-entry will be read-only */
#define AT24_FLAG_IRUGO 0x20 /* sysfs-entry will be world-readable */
#define AT24_FLAG_TAKE8ADDR 0x10 /* take always 8 addresses (24c00) */
};
#endif /* _LINUX_AT24_H */