affea5fe9e
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25865 a1c6a512-1295-4272-9138-f99709370657
64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef I2C_IMX31_H
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#define I2C_IMX31_H
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#include <stdbool.h>
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/* I2C module usage masks */
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#define USE_I2C1_MODULE (1 << 0)
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#define USE_I2C2_MODULE (1 << 1)
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#define USE_I2C3_MODULE (1 << 2)
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enum i2c_module_number
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{
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__I2C_NUM_START = -1,
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#if (I2C_MODULE_MASK & USE_I2C1_MODULE)
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I2C1_NUM,
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#endif
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#if (I2C_MODULE_MASK & USE_I2C2_MODULE)
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I2C2_NUM,
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#endif
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#if (I2C_MODULE_MASK & USE_I2C3_MODULE)
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I2C3_NUM,
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#endif
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I2C_NUM_I2C,
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};
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struct i2c_node
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{
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enum i2c_module_number num; /* Module that this node uses */
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unsigned int ifdr; /* Maximum frequency for node */
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unsigned char addr; /* Slave address on module */
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};
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void i2c_init(void);
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/* Enable or disable the node - modules will be switch on/off accordingly. */
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void i2c_enable_node(struct i2c_node *node, bool enable);
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/* If addr < 0, then raw read */
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int i2c_read(struct i2c_node *node, int addr, unsigned char *data, int count);
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int i2c_write(struct i2c_node *node, const unsigned char *data, int count);
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/* Gain mutually-exclusive access to the node and module to perform multiple
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* operations atomically */
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void i2c_lock_node(struct i2c_node *node);
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void i2c_unlock_node(struct i2c_node *node);
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#endif /* I2C_IMX31_H */
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