mirror of https://gitee.com/openkylin/linux.git
86 lines
1.8 KiB
C
86 lines
1.8 KiB
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 <linux/i2c.h>
|
|
#include <linux/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 struct i2c_adapter frodo_ops = {
|
|
.owner = THIS_MODULE,
|
|
.id = I2C_HW_B_FRODO,
|
|
.algo_data = &bit_frodo_data,
|
|
.dev = {
|
|
.name = "Frodo adapter driver",
|
|
},
|
|
};
|
|
|
|
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);
|
|
|