From 2b7a5056a0a7ff17d5d2004c29c852a92a6bd632 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Mon, 14 Jul 2008 22:38:35 +0200 Subject: 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 Signed-off-by: Jean Delvare --- include/linux/i2c/at24.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 include/linux/i2c/at24.h (limited to 'include/linux/i2c') diff --git a/include/linux/i2c/at24.h b/include/linux/i2c/at24.h new file mode 100644 index 000000000000..f6edd522a929 --- /dev/null +++ b/include/linux/i2c/at24.h @@ -0,0 +1,28 @@ +#ifndef _LINUX_AT24_H +#define _LINUX_AT24_H + +#include + +/* + * 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 */ -- cgit v1.2.3