include/asm-ppc/pmac_low_i2c.h

   1 /*
   2  *  include/asm-ppc/pmac_low_i2c.h
   3  *
   4  *  Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  *
  11  */
  12 #ifndef __PMAC_LOW_I2C_H__
  13 #define __PMAC_LOW_I2C_H__
  14
  15 /* i2c mode (based on the platform functions format) */
  16 enum {
  17         pmac_low_i2c_mode_dumb          = 1,
  18         pmac_low_i2c_mode_std           = 2,
  19         pmac_low_i2c_mode_stdsub        = 3,
  20         pmac_low_i2c_mode_combined      = 4,
  21 };
  22
  23 /* RW bit in address */
  24 enum {
  25         pmac_low_i2c_read               = 0x01,
  26         pmac_low_i2c_write              = 0x00
  27 };
  28
  29 /* Init, called early during boot */
  30 extern void pmac_init_low_i2c(void);
  31
  32 /* Locking functions exposed to i2c-keywest */
  33 int pmac_low_i2c_lock(struct device_node *np);
  34 int pmac_low_i2c_unlock(struct device_node *np);
  35
  36 /* Access functions for platform code */
  37 int pmac_low_i2c_open(struct device_node *np, int channel);
  38 int pmac_low_i2c_close(struct device_node *np);
  39 int pmac_low_i2c_setmode(struct device_node *np, int mode);
  40 int pmac_low_i2c_xfer(struct device_node *np, u8 addrdir, u8 subaddr, u8 *data, int len);
  41
  42
  43 #endif /* __PMAC_LOW_I2C_H__ */