/*
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* at24.h - platform_data for the at24 (generic eeprom) driver
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* (C) Copyright 2008 by Pengutronix
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* (C) Copyright 2012 by Wolfram Sang
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* same license as the driver
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*/
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#ifndef _LINUX_AT24_H
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#define _LINUX_AT24_H
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#include <linux/types.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/bitops.h>
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/**
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* struct at24_platform_data - data to set up at24 (generic eeprom) driver
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* @byte_len: size of eeprom in byte
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* @page_size: number of byte which can be written in one go
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* @flags: tunable options, check AT24_FLAG_* defines
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* @setup: an optional callback invoked after eeprom is probed; enables kernel
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code to access eeprom via nvmem, see example
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* @context: optional parameter passed to setup()
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*
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* If you set up a custom eeprom type, please double-check the parameters.
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* Especially page_size needs extra care, as you risk data loss if your value
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* is bigger than what the chip actually supports!
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*
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* An example in pseudo code for a setup() callback:
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*
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* void get_mac_addr(struct nvmem_device *nvmem, void *context)
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* {
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* u8 *mac_addr = ethernet_pdata->mac_addr;
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* off_t offset = context;
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*
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* // Read MAC addr from EEPROM
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* if (nvmem_device_read(nvmem, offset, ETH_ALEN, mac_addr) == ETH_ALEN)
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* pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
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* }
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*
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* This function pointer and context can now be set up in at24_platform_data.
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*/
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struct at24_platform_data {
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u32 byte_len; /* size (sum of all addr) */
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u16 page_size; /* for writes */
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u8 flags;
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#define AT24_FLAG_ADDR16 BIT(7) /* address pointer is 16 bit */
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#define AT24_FLAG_READONLY BIT(6) /* sysfs-entry will be read-only */
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#define AT24_FLAG_IRUGO BIT(5) /* sysfs-entry will be world-readable */
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#define AT24_FLAG_TAKE8ADDR BIT(4) /* take always 8 addresses (24c00) */
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#define AT24_FLAG_SERIAL BIT(3) /* factory-programmed serial number */
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#define AT24_FLAG_MAC BIT(2) /* factory-programmed mac address */
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#define AT24_FLAG_NO_RDROL BIT(1) /* does not auto-rollover reads to */
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/* the next slave address */
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void (*setup)(struct nvmem_device *nvmem, void *context);
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void *context;
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};
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#endif /* _LINUX_AT24_H */
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