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420 giacomo 1
 
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/*
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 * linux/drivers/i2c/i2c-frodo.c
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 *
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 * Author: Abraham van der Merwe <abraham@2d3d.co.za>
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 *
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 * An I2C adapter driver for the 2d3D, Inc. StrongARM SA-1110
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 * Development board (Frodo).
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 *
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 * This source code 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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 * version 2 as published by the Free Software Foundation.
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 */
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <asm/hardware.h>
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static void frodo_setsda (void *data,int state)
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{
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        if (state)
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                FRODO_CPLD_I2C |= FRODO_I2C_SDA_OUT;
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        else
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                FRODO_CPLD_I2C &= ~FRODO_I2C_SDA_OUT;
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}
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static void frodo_setscl (void *data,int state)
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{
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        if (state)
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                FRODO_CPLD_I2C |= FRODO_I2C_SCL_OUT;
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        else
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                FRODO_CPLD_I2C &= ~FRODO_I2C_SCL_OUT;
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}
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static int frodo_getsda (void *data)
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{
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        return ((FRODO_CPLD_I2C & FRODO_I2C_SDA_IN) != 0);
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}
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static int frodo_getscl (void *data)
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{
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        return ((FRODO_CPLD_I2C & FRODO_I2C_SCL_IN) != 0);
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}
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static struct i2c_algo_bit_data bit_frodo_data = {
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        .setsda         = frodo_setsda,
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        .setscl         = frodo_setscl,
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        .getsda         = frodo_getsda,
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        .getscl         = frodo_getscl,
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        .udelay         = 80,
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        .mdelay         = 80,
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        .timeout        = HZ
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};
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static struct i2c_adapter frodo_ops = {
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        .owner                  = THIS_MODULE,
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        .id                     = I2C_HW_B_FRODO,
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        .algo_data              = &bit_frodo_data,
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        .dev                    = {
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                .name           = "Frodo adapter driver",
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        },
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};
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static int __init i2c_frodo_init (void)
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{
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        return i2c_bit_add_bus(&frodo_ops);
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}
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static void __exit i2c_frodo_exit (void)
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{
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        i2c_bit_del_bus(&frodo_ops);
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}
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MODULE_AUTHOR ("Abraham van der Merwe <abraham@2d3d.co.za>");
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MODULE_DESCRIPTION ("I2C-Bus adapter routines for Frodo");
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MODULE_LICENSE ("GPL");
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module_init (i2c_frodo_init);
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module_exit (i2c_frodo_exit);
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