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/*

* at24.h - platform_data for the at24 (generic eeprom) driver

* (C) Copyright 2008 by Pengutronix

* (C) Copyright 2012 by Wolfram Sang

* same license as the driver

*/

#ifndef _LINUX_AT24_H

#define _LINUX_AT24_H

#include <linux/types.h>

#include <linux/memory.h>

/**

* struct at24_platform_data - data to set up at24 (generic eeprom) driver

* @byte_len: size of eeprom in byte

* @page_size: number of byte which can be written in one go

* @flags: tunable options, check AT24_FLAG_* defines

* @setup: an optional callback invoked after eeprom is probed; enables kernel

code to access eeprom via memory_accessor, see example

* @context: optional parameter passed to setup()

*

* 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!

*

* An example in pseudo code for a setup() callback:

*

* void get_mac_addr(struct memory_accessor *mem_acc, void *context)

* {

* u8 *mac_addr = ethernet_pdata->mac_addr;

* off_t offset = context;

*

* // Read MAC addr from EEPROM

* if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)

* pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);

* }

*

* This function pointer and context can now be set up in at24_platform_data.

*/

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) */

void (*setup)(struct memory_accessor *, void *context);

void *context;

};

#endif /* _LINUX_AT24_H */