96 lines
2.9 KiB
C
96 lines
2.9 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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#include "semaphore.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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struct i2c_transfer_desc;
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typedef void (*i2c_transfer_cb_fn_type)(struct i2c_transfer_desc *);
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/* Basic transfer descriptor for normal asynchronous read/write */
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struct i2c_transfer_desc
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{
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struct i2c_node *node;
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const unsigned char *txdata;
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int txcount;
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unsigned char *rxdata;
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int rxcount;
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i2c_transfer_cb_fn_type callback;
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struct i2c_transfer_desc *next;
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};
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/* Extended transfer descriptor for synchronous read/write that handles
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thread wait and wakeup */
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struct i2c_sync_transfer_desc
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{
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struct i2c_transfer_desc xfer;
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struct semaphore sema;
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};
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/* One-time init of i2c driver */
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void i2c_init(void);
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/* Enable or disable the node - modules will be switched on/off accordingly. */
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void i2c_enable_node(struct i2c_node *node, bool enable);
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/* Send and/or receive data on the specified node asynchronously */
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bool i2c_transfer(struct i2c_transfer_desc *xfer);
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/* Read bytes from a device on the I2C bus, with optional sub-addressing
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* If addr < 0, then raw read without sub-addressing */
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int i2c_read(struct i2c_node *node, int addr, unsigned char *data,
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int data_count);
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/* Write bytes to a device on the I2C bus */
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int i2c_write(struct i2c_node *node, const unsigned char *data,
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int data_count);
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#endif /* I2C_IMX31_H */
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