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1 | /* |
2 | * at24.h - platform_data for the at24 (generic eeprom) driver | |
3 | * (C) Copyright 2008 by Pengutronix | |
4 | * (C) Copyright 2012 by Wolfram Sang | |
5 | * same license as the driver | |
6 | */ | |
7 | ||
2b7a5056 WS |
8 | #ifndef _LINUX_AT24_H |
9 | #define _LINUX_AT24_H | |
10 | ||
11 | #include <linux/types.h> | |
7274ec8b | 12 | #include <linux/memory.h> |
2b7a5056 | 13 | |
64eac231 WS |
14 | /** |
15 | * struct at24_platform_data - data to set up at24 (generic eeprom) driver | |
16 | * @byte_len: size of eeprom in byte | |
17 | * @page_size: number of byte which can be written in one go | |
18 | * @flags: tunable options, check AT24_FLAG_* defines | |
19 | * @setup: an optional callback invoked after eeprom is probed; enables kernel | |
20 | code to access eeprom via memory_accessor, see example | |
21 | * @context: optional parameter passed to setup() | |
2b7a5056 WS |
22 | * |
23 | * If you set up a custom eeprom type, please double-check the parameters. | |
24 | * Especially page_size needs extra care, as you risk data loss if your value | |
25 | * is bigger than what the chip actually supports! | |
64eac231 WS |
26 | * |
27 | * An example in pseudo code for a setup() callback: | |
28 | * | |
29 | * void get_mac_addr(struct memory_accessor *mem_acc, void *context) | |
30 | * { | |
31 | * u8 *mac_addr = ethernet_pdata->mac_addr; | |
32 | * off_t offset = context; | |
33 | * | |
34 | * // Read MAC addr from EEPROM | |
35 | * if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN) | |
36 | * pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr); | |
37 | * } | |
38 | * | |
39 | * This function pointer and context can now be set up in at24_platform_data. | |
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40 | */ |
41 | ||
42 | struct at24_platform_data { | |
43 | u32 byte_len; /* size (sum of all addr) */ | |
44 | u16 page_size; /* for writes */ | |
45 | u8 flags; | |
46 | #define AT24_FLAG_ADDR16 0x80 /* address pointer is 16 bit */ | |
47 | #define AT24_FLAG_READONLY 0x40 /* sysfs-entry will be read-only */ | |
48 | #define AT24_FLAG_IRUGO 0x20 /* sysfs-entry will be world-readable */ | |
49 | #define AT24_FLAG_TAKE8ADDR 0x10 /* take always 8 addresses (24c00) */ | |
7274ec8b KH |
50 | |
51 | void (*setup)(struct memory_accessor *, void *context); | |
52 | void *context; | |
2b7a5056 WS |
53 | }; |
54 | ||
55 | #endif /* _LINUX_AT24_H */ |