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i2c-frodo.c

/*
 * linux/drivers/i2c/i2c-frodo.c
 *
 * Author: Abraham van der Merwe <abraham@2d3d.co.za>
 *
 * An I2C adapter driver for the 2d3D, Inc. StrongARM SA-1110
 * Development board (Frodo).
 *
 * This source code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include "i2c.h"
#include "i2c-algo-bit.h"
#include <asm/hardware.h>


static void frodo_setsda (void *data,int state)
{
      if (state)
            FRODO_CPLD_I2C |= FRODO_I2C_SDA_OUT;
      else
            FRODO_CPLD_I2C &= ~FRODO_I2C_SDA_OUT;
}

static void frodo_setscl (void *data,int state)
{
      if (state)
            FRODO_CPLD_I2C |= FRODO_I2C_SCL_OUT;
      else
            FRODO_CPLD_I2C &= ~FRODO_I2C_SCL_OUT;
}

static int frodo_getsda (void *data)
{
      return ((FRODO_CPLD_I2C & FRODO_I2C_SDA_IN) != 0);
}

static int frodo_getscl (void *data)
{
      return ((FRODO_CPLD_I2C & FRODO_I2C_SCL_IN) != 0);
}

static struct i2c_algo_bit_data bit_frodo_data = {
      .setsda           = frodo_setsda,
      .setscl           = frodo_setscl,
      .getsda           = frodo_getsda,
      .getscl           = frodo_getscl,
      .udelay           = 80,
      .mdelay           = 80,
      .timeout    = HZ
};

static void frodo_inc_use(struct i2c_adapter *adap)
{
#ifdef MODULE
      MOD_INC_USE_COUNT;
#endif
}

static void frodo_dec_use(struct i2c_adapter *adap)
{
#ifdef MODULE
      MOD_DEC_USE_COUNT;
#endif
}

static struct i2c_adapter frodo_ops = {
      .name             = "Frodo adapter driver",
      .id               = I2C_HW_B_FRODO,
      .algo_data        = &bit_frodo_data,
      .inc_use          = frodo_inc_use,
      .dec_use          = frodo_dec_use,
};

static int __init i2c_frodo_init (void)
{
      return i2c_bit_add_bus(&frodo_ops);
}

static void __exit i2c_frodo_exit (void)
{
      i2c_bit_del_bus(&frodo_ops);
}

MODULE_AUTHOR ("Abraham van der Merwe <abraham@2d3d.co.za>");
MODULE_DESCRIPTION ("I2C-Bus adapter routines for Frodo");
MODULE_LICENSE ("GPL");

module_init (i2c_frodo_init);
module_exit (i2c_frodo_exit);


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