| /* |
| * 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 */ |
