include/linux/i2c/at24.h

   1 #ifndef _LINUX_AT24_H
   2 #define _LINUX_AT24_H
   3
   4 #include <linux/types.h>
   5 #include <linux/memory.h>
   6
   7 /*
   8  * As seen through Linux I2C, differences between the most common types of I2C
   9  * memory include:
  10  * - How much memory is available (usually specified in bit)?
  11  * - What write page size does it support?
  12  * - Special flags (16 bit addresses, read_only, world readable...)?
  13  *
  14  * If you set up a custom eeprom type, please double-check the parameters.
  15  * Especially page_size needs extra care, as you risk data loss if your value
  16  * is bigger than what the chip actually supports!
  17  */
  18
  19 struct at24_platform_data {
  20         u32             byte_len;               /* size (sum of all addr) */
  21         u16             page_size;              /* for writes */
  22         u8              flags;
  23 #define AT24_FLAG_ADDR16        0x80    /* address pointer is 16 bit */
  24 #define AT24_FLAG_READONLY      0x40    /* sysfs-entry will be read-only */
  25 #define AT24_FLAG_IRUGO         0x20    /* sysfs-entry will be world-readable */
  26 #define AT24_FLAG_TAKE8ADDR     0x10    /* take always 8 addresses (24c00) */
  27
  28         void            (*setup)(struct memory_accessor *, void *context);
  29         void            *context;
  30 };
  31
  32 #endif /* _LINUX_AT24_H */