include/linux/i2c/at24.h

   1 #ifndef _LINUX_AT24_H
   2 #define _LINUX_AT24_H
   3
   4 #include <linux/types.h>
   5
   6 /*
   7  * As seen through Linux I2C, differences between the most common types of I2C
   8  * memory include:
   9  * - How much memory is available (usually specified in bit)?
  10  * - What write page size does it support?
  11  * - Special flags (16 bit addresses, read_only, world readable...)?
  12  *
  13  * If you set up a custom eeprom type, please double-check the parameters.
  14  * Especially page_size needs extra care, as you risk data loss if your value
  15  * is bigger than what the chip actually supports!
  16  */
  17
  18 struct at24_platform_data {
  19         u32             byte_len;               /* size (sum of all addr) */
  20         u16             page_size;              /* for writes */
  21         u8              flags;
  22 #define AT24_FLAG_ADDR16        0x80    /* address pointer is 16 bit */
  23 #define AT24_FLAG_READONLY      0x40    /* sysfs-entry will be read-only */
  24 #define AT24_FLAG_IRUGO         0x20    /* sysfs-entry will be world-readable */
  25 #define AT24_FLAG_TAKE8ADDR     0x10    /* take always 8 addresses (24c00) */
  26 };
  27
  28 #endif /* _LINUX_AT24_H */