firmware/target/arm/imx31/i2c-imx31.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Michael Sevakis
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef I2C_IMX31_H
  22 #define I2C_IMX31_H
  23
  24 #include <stdbool.h>
  25
  26 /* I2C module usage masks */
  27 #define USE_I2C1_MODULE         (1 << 0)
  28 #define USE_I2C2_MODULE         (1 << 1)
  29 #define USE_I2C3_MODULE         (1 << 2)
  30
  31 enum i2c_module_number
  32 {
  33     __I2C_NUM_START = -1,
  34 #if (I2C_MODULE_MASK & USE_I2C1_MODULE)
  35     I2C1_NUM,
  36 #endif
  37 #if (I2C_MODULE_MASK & USE_I2C2_MODULE)
  38     I2C2_NUM,
  39 #endif
  40 #if (I2C_MODULE_MASK & USE_I2C3_MODULE)
  41     I2C3_NUM,
  42 #endif
  43     I2C_NUM_I2C,
  44 };
  45
  46 struct i2c_node
  47 {
  48     enum i2c_module_number num; /* Module that this node uses */
  49     unsigned int ifdr;          /* Maximum frequency for node */
  50     unsigned char addr;         /* Slave address on module */
  51 };
  52
  53 void i2c_init(void);
  54 /* Enable or disable the node - modules will be switch on/off accordingly. */
  55 void i2c_enable_node(struct i2c_node *node, bool enable);
  56 /* If addr < 0, then raw read */
  57 int i2c_read(struct i2c_node *node, int addr, unsigned char *data, int count);
  58 int i2c_write(struct i2c_node *node, const unsigned char *data, int count);
  59 /* Gain mutually-exclusive access to the node and module to perform multiple
  60  * operations atomically */
  61 void i2c_lock_node(struct i2c_node *node);
  62 void i2c_unlock_node(struct i2c_node *node);
  63
  64 #endif /* I2C_IMX31_H */