556dcee7b8
Change all users of header files to correct path. Remove some unneeded headers for arch-v32. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
704 lines
14 KiB
C
704 lines
14 KiB
C
/*!***************************************************************************
|
|
*!
|
|
*! FILE NAME : i2c.c
|
|
*!
|
|
*! DESCRIPTION: implements an interface for IIC/I2C, both directly from other
|
|
*! kernel modules (i2c_writereg/readreg) and from userspace using
|
|
*! ioctl()'s
|
|
*!
|
|
*! (C) Copyright 1999-2007 Axis Communications AB, LUND, SWEDEN
|
|
*!
|
|
*!***************************************************************************/
|
|
|
|
/****************** INCLUDE FILES SECTION ***********************************/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/etraxi2c.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <arch/svinto.h>
|
|
#include <asm/io.h>
|
|
#include <asm/delay.h>
|
|
#include <arch/io_interface_mux.h>
|
|
|
|
#include "i2c.h"
|
|
|
|
/****************** I2C DEFINITION SECTION *************************/
|
|
|
|
#define D(x)
|
|
|
|
#define I2C_MAJOR 123 /* LOCAL/EXPERIMENTAL */
|
|
static const char i2c_name[] = "i2c";
|
|
|
|
#define CLOCK_LOW_TIME 8
|
|
#define CLOCK_HIGH_TIME 8
|
|
#define START_CONDITION_HOLD_TIME 8
|
|
#define STOP_CONDITION_HOLD_TIME 8
|
|
#define ENABLE_OUTPUT 0x01
|
|
#define ENABLE_INPUT 0x00
|
|
#define I2C_CLOCK_HIGH 1
|
|
#define I2C_CLOCK_LOW 0
|
|
#define I2C_DATA_HIGH 1
|
|
#define I2C_DATA_LOW 0
|
|
|
|
#ifdef CONFIG_ETRAX_I2C_USES_PB_NOT_PB_I2C
|
|
/* Use PB and not PB_I2C */
|
|
#ifndef CONFIG_ETRAX_I2C_DATA_PORT
|
|
#define CONFIG_ETRAX_I2C_DATA_PORT 0
|
|
#endif
|
|
#ifndef CONFIG_ETRAX_I2C_CLK_PORT
|
|
#define CONFIG_ETRAX_I2C_CLK_PORT 1
|
|
#endif
|
|
|
|
#define SDABIT CONFIG_ETRAX_I2C_DATA_PORT
|
|
#define SCLBIT CONFIG_ETRAX_I2C_CLK_PORT
|
|
#define i2c_enable()
|
|
#define i2c_disable()
|
|
|
|
/* enable or disable output-enable, to select output or input on the i2c bus */
|
|
|
|
#define i2c_dir_out() \
|
|
REG_SHADOW_SET(R_PORT_PB_DIR, port_pb_dir_shadow, SDABIT, 1)
|
|
#define i2c_dir_in() \
|
|
REG_SHADOW_SET(R_PORT_PB_DIR, port_pb_dir_shadow, SDABIT, 0)
|
|
|
|
/* control the i2c clock and data signals */
|
|
|
|
#define i2c_clk(x) \
|
|
REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, SCLBIT, x)
|
|
#define i2c_data(x) \
|
|
REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, SDABIT, x)
|
|
|
|
/* read a bit from the i2c interface */
|
|
|
|
#define i2c_getbit() (((*R_PORT_PB_READ & (1 << SDABIT))) >> SDABIT)
|
|
|
|
#else
|
|
/* enable or disable the i2c interface */
|
|
|
|
#define i2c_enable() *R_PORT_PB_I2C = (port_pb_i2c_shadow |= IO_MASK(R_PORT_PB_I2C, i2c_en))
|
|
#define i2c_disable() *R_PORT_PB_I2C = (port_pb_i2c_shadow &= ~IO_MASK(R_PORT_PB_I2C, i2c_en))
|
|
|
|
/* enable or disable output-enable, to select output or input on the i2c bus */
|
|
|
|
#define i2c_dir_out() \
|
|
*R_PORT_PB_I2C = (port_pb_i2c_shadow &= ~IO_MASK(R_PORT_PB_I2C, i2c_oe_)); \
|
|
REG_SHADOW_SET(R_PORT_PB_DIR, port_pb_dir_shadow, 0, 1);
|
|
#define i2c_dir_in() \
|
|
*R_PORT_PB_I2C = (port_pb_i2c_shadow |= IO_MASK(R_PORT_PB_I2C, i2c_oe_)); \
|
|
REG_SHADOW_SET(R_PORT_PB_DIR, port_pb_dir_shadow, 0, 0);
|
|
|
|
/* control the i2c clock and data signals */
|
|
|
|
#define i2c_clk(x) \
|
|
*R_PORT_PB_I2C = (port_pb_i2c_shadow = (port_pb_i2c_shadow & \
|
|
~IO_MASK(R_PORT_PB_I2C, i2c_clk)) | IO_FIELD(R_PORT_PB_I2C, i2c_clk, (x))); \
|
|
REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, 1, x);
|
|
|
|
#define i2c_data(x) \
|
|
*R_PORT_PB_I2C = (port_pb_i2c_shadow = (port_pb_i2c_shadow & \
|
|
~IO_MASK(R_PORT_PB_I2C, i2c_d)) | IO_FIELD(R_PORT_PB_I2C, i2c_d, (x))); \
|
|
REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, 0, x);
|
|
|
|
/* read a bit from the i2c interface */
|
|
|
|
#define i2c_getbit() (*R_PORT_PB_READ & 0x1)
|
|
#endif
|
|
|
|
/* use the kernels delay routine */
|
|
|
|
#define i2c_delay(usecs) udelay(usecs)
|
|
|
|
static DEFINE_SPINLOCK(i2c_lock); /* Protect directions etc */
|
|
|
|
/****************** FUNCTION DEFINITION SECTION *************************/
|
|
|
|
|
|
/* generate i2c start condition */
|
|
|
|
void
|
|
i2c_start(void)
|
|
{
|
|
/*
|
|
* SCL=1 SDA=1
|
|
*/
|
|
i2c_dir_out();
|
|
i2c_delay(CLOCK_HIGH_TIME/6);
|
|
i2c_data(I2C_DATA_HIGH);
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME);
|
|
/*
|
|
* SCL=1 SDA=0
|
|
*/
|
|
i2c_data(I2C_DATA_LOW);
|
|
i2c_delay(START_CONDITION_HOLD_TIME);
|
|
/*
|
|
* SCL=0 SDA=0
|
|
*/
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
}
|
|
|
|
/* generate i2c stop condition */
|
|
|
|
void
|
|
i2c_stop(void)
|
|
{
|
|
i2c_dir_out();
|
|
|
|
/*
|
|
* SCL=0 SDA=0
|
|
*/
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_data(I2C_DATA_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME*2);
|
|
/*
|
|
* SCL=1 SDA=0
|
|
*/
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME*2);
|
|
/*
|
|
* SCL=1 SDA=1
|
|
*/
|
|
i2c_data(I2C_DATA_HIGH);
|
|
i2c_delay(STOP_CONDITION_HOLD_TIME);
|
|
|
|
i2c_dir_in();
|
|
}
|
|
|
|
/* write a byte to the i2c interface */
|
|
|
|
void
|
|
i2c_outbyte(unsigned char x)
|
|
{
|
|
int i;
|
|
|
|
i2c_dir_out();
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
if (x & 0x80) {
|
|
i2c_data(I2C_DATA_HIGH);
|
|
} else {
|
|
i2c_data(I2C_DATA_LOW);
|
|
}
|
|
|
|
i2c_delay(CLOCK_LOW_TIME/2);
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME);
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME/2);
|
|
x <<= 1;
|
|
}
|
|
i2c_data(I2C_DATA_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME/2);
|
|
|
|
/*
|
|
* enable input
|
|
*/
|
|
i2c_dir_in();
|
|
}
|
|
|
|
/* read a byte from the i2c interface */
|
|
|
|
unsigned char
|
|
i2c_inbyte(void)
|
|
{
|
|
unsigned char aBitByte = 0;
|
|
int i;
|
|
|
|
/* Switch off I2C to get bit */
|
|
i2c_disable();
|
|
i2c_dir_in();
|
|
i2c_delay(CLOCK_HIGH_TIME/2);
|
|
|
|
/* Get bit */
|
|
aBitByte |= i2c_getbit();
|
|
|
|
/* Enable I2C */
|
|
i2c_enable();
|
|
i2c_delay(CLOCK_LOW_TIME/2);
|
|
|
|
for (i = 1; i < 8; i++) {
|
|
aBitByte <<= 1;
|
|
/* Clock pulse */
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME);
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
|
|
/* Switch off I2C to get bit */
|
|
i2c_disable();
|
|
i2c_dir_in();
|
|
i2c_delay(CLOCK_HIGH_TIME/2);
|
|
|
|
/* Get bit */
|
|
aBitByte |= i2c_getbit();
|
|
|
|
/* Enable I2C */
|
|
i2c_enable();
|
|
i2c_delay(CLOCK_LOW_TIME/2);
|
|
}
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME);
|
|
|
|
/*
|
|
* we leave the clock low, getbyte is usually followed
|
|
* by sendack/nack, they assume the clock to be low
|
|
*/
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
return aBitByte;
|
|
}
|
|
|
|
/*#---------------------------------------------------------------------------
|
|
*#
|
|
*# FUNCTION NAME: i2c_getack
|
|
*#
|
|
*# DESCRIPTION : checks if ack was received from ic2
|
|
*#
|
|
*#--------------------------------------------------------------------------*/
|
|
|
|
int
|
|
i2c_getack(void)
|
|
{
|
|
int ack = 1;
|
|
/*
|
|
* enable output
|
|
*/
|
|
i2c_dir_out();
|
|
/*
|
|
* Release data bus by setting
|
|
* data high
|
|
*/
|
|
i2c_data(I2C_DATA_HIGH);
|
|
/*
|
|
* enable input
|
|
*/
|
|
i2c_dir_in();
|
|
i2c_delay(CLOCK_HIGH_TIME/4);
|
|
/*
|
|
* generate ACK clock pulse
|
|
*/
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
/*
|
|
* Use PORT PB instead of I2C
|
|
* for input. (I2C not working)
|
|
*/
|
|
i2c_clk(1);
|
|
i2c_data(1);
|
|
/*
|
|
* switch off I2C
|
|
*/
|
|
i2c_data(1);
|
|
i2c_disable();
|
|
i2c_dir_in();
|
|
/*
|
|
* now wait for ack
|
|
*/
|
|
i2c_delay(CLOCK_HIGH_TIME/2);
|
|
/*
|
|
* check for ack
|
|
*/
|
|
if(i2c_getbit())
|
|
ack = 0;
|
|
i2c_delay(CLOCK_HIGH_TIME/2);
|
|
if(!ack){
|
|
if(!i2c_getbit()) /* receiver pulld SDA low */
|
|
ack = 1;
|
|
i2c_delay(CLOCK_HIGH_TIME/2);
|
|
}
|
|
|
|
/*
|
|
* our clock is high now, make sure data is low
|
|
* before we enable our output. If we keep data high
|
|
* and enable output, we would generate a stop condition.
|
|
*/
|
|
i2c_data(I2C_DATA_LOW);
|
|
|
|
/*
|
|
* end clock pulse
|
|
*/
|
|
i2c_enable();
|
|
i2c_dir_out();
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_delay(CLOCK_HIGH_TIME/4);
|
|
/*
|
|
* enable output
|
|
*/
|
|
i2c_dir_out();
|
|
/*
|
|
* remove ACK clock pulse
|
|
*/
|
|
i2c_data(I2C_DATA_HIGH);
|
|
i2c_delay(CLOCK_LOW_TIME/2);
|
|
return ack;
|
|
}
|
|
|
|
/*#---------------------------------------------------------------------------
|
|
*#
|
|
*# FUNCTION NAME: I2C::sendAck
|
|
*#
|
|
*# DESCRIPTION : Send ACK on received data
|
|
*#
|
|
*#--------------------------------------------------------------------------*/
|
|
void
|
|
i2c_sendack(void)
|
|
{
|
|
/*
|
|
* enable output
|
|
*/
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
i2c_dir_out();
|
|
/*
|
|
* set ack pulse high
|
|
*/
|
|
i2c_data(I2C_DATA_LOW);
|
|
/*
|
|
* generate clock pulse
|
|
*/
|
|
i2c_delay(CLOCK_HIGH_TIME/6);
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME);
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME/6);
|
|
/*
|
|
* reset data out
|
|
*/
|
|
i2c_data(I2C_DATA_HIGH);
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
|
|
i2c_dir_in();
|
|
}
|
|
|
|
/*#---------------------------------------------------------------------------
|
|
*#
|
|
*# FUNCTION NAME: i2c_sendnack
|
|
*#
|
|
*# DESCRIPTION : Sends NACK on received data
|
|
*#
|
|
*#--------------------------------------------------------------------------*/
|
|
void
|
|
i2c_sendnack(void)
|
|
{
|
|
/*
|
|
* enable output
|
|
*/
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
i2c_dir_out();
|
|
/*
|
|
* set data high
|
|
*/
|
|
i2c_data(I2C_DATA_HIGH);
|
|
/*
|
|
* generate clock pulse
|
|
*/
|
|
i2c_delay(CLOCK_HIGH_TIME/6);
|
|
i2c_clk(I2C_CLOCK_HIGH);
|
|
i2c_delay(CLOCK_HIGH_TIME);
|
|
i2c_clk(I2C_CLOCK_LOW);
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
|
|
i2c_dir_in();
|
|
}
|
|
|
|
/*#---------------------------------------------------------------------------
|
|
*#
|
|
*# FUNCTION NAME: i2c_writereg
|
|
*#
|
|
*# DESCRIPTION : Writes a value to an I2C device
|
|
*#
|
|
*#--------------------------------------------------------------------------*/
|
|
int
|
|
i2c_writereg(unsigned char theSlave, unsigned char theReg,
|
|
unsigned char theValue)
|
|
{
|
|
int error, cntr = 3;
|
|
unsigned long flags;
|
|
|
|
spin_lock(&i2c_lock);
|
|
|
|
do {
|
|
error = 0;
|
|
/*
|
|
* we don't like to be interrupted
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
i2c_start();
|
|
/*
|
|
* send slave address
|
|
*/
|
|
i2c_outbyte((theSlave & 0xfe));
|
|
/*
|
|
* wait for ack
|
|
*/
|
|
if(!i2c_getack())
|
|
error = 1;
|
|
/*
|
|
* now select register
|
|
*/
|
|
i2c_dir_out();
|
|
i2c_outbyte(theReg);
|
|
/*
|
|
* now it's time to wait for ack
|
|
*/
|
|
if(!i2c_getack())
|
|
error |= 2;
|
|
/*
|
|
* send register register data
|
|
*/
|
|
i2c_outbyte(theValue);
|
|
/*
|
|
* now it's time to wait for ack
|
|
*/
|
|
if(!i2c_getack())
|
|
error |= 4;
|
|
/*
|
|
* end byte stream
|
|
*/
|
|
i2c_stop();
|
|
/*
|
|
* enable interrupt again
|
|
*/
|
|
local_irq_restore(flags);
|
|
|
|
} while(error && cntr--);
|
|
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
|
|
spin_unlock(&i2c_lock);
|
|
|
|
return -error;
|
|
}
|
|
|
|
/*#---------------------------------------------------------------------------
|
|
*#
|
|
*# FUNCTION NAME: i2c_readreg
|
|
*#
|
|
*# DESCRIPTION : Reads a value from the decoder registers.
|
|
*#
|
|
*#--------------------------------------------------------------------------*/
|
|
unsigned char
|
|
i2c_readreg(unsigned char theSlave, unsigned char theReg)
|
|
{
|
|
unsigned char b = 0;
|
|
int error, cntr = 3;
|
|
unsigned long flags;
|
|
|
|
spin_lock(&i2c_lock);
|
|
|
|
do {
|
|
error = 0;
|
|
/*
|
|
* we don't like to be interrupted
|
|
*/
|
|
local_irq_save(flags);
|
|
/*
|
|
* generate start condition
|
|
*/
|
|
i2c_start();
|
|
|
|
/*
|
|
* send slave address
|
|
*/
|
|
i2c_outbyte((theSlave & 0xfe));
|
|
/*
|
|
* wait for ack
|
|
*/
|
|
if(!i2c_getack())
|
|
error = 1;
|
|
/*
|
|
* now select register
|
|
*/
|
|
i2c_dir_out();
|
|
i2c_outbyte(theReg);
|
|
/*
|
|
* now it's time to wait for ack
|
|
*/
|
|
if(!i2c_getack())
|
|
error = 1;
|
|
/*
|
|
* repeat start condition
|
|
*/
|
|
i2c_delay(CLOCK_LOW_TIME);
|
|
i2c_start();
|
|
/*
|
|
* send slave address
|
|
*/
|
|
i2c_outbyte(theSlave | 0x01);
|
|
/*
|
|
* wait for ack
|
|
*/
|
|
if(!i2c_getack())
|
|
error = 1;
|
|
/*
|
|
* fetch register
|
|
*/
|
|
b = i2c_inbyte();
|
|
/*
|
|
* last received byte needs to be nacked
|
|
* instead of acked
|
|
*/
|
|
i2c_sendnack();
|
|
/*
|
|
* end sequence
|
|
*/
|
|
i2c_stop();
|
|
/*
|
|
* enable interrupt again
|
|
*/
|
|
local_irq_restore(flags);
|
|
|
|
} while(error && cntr--);
|
|
|
|
spin_unlock(&i2c_lock);
|
|
|
|
return b;
|
|
}
|
|
|
|
static int
|
|
i2c_open(struct inode *inode, struct file *filp)
|
|
{
|
|
cycle_kernel_lock();
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
i2c_release(struct inode *inode, struct file *filp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Main device API. ioctl's to write or read to/from i2c registers.
|
|
*/
|
|
|
|
static int
|
|
i2c_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
if(_IOC_TYPE(cmd) != ETRAXI2C_IOCTYPE) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (_IOC_NR(cmd)) {
|
|
case I2C_WRITEREG:
|
|
/* write to an i2c slave */
|
|
D(printk("i2cw %d %d %d\n",
|
|
I2C_ARGSLAVE(arg),
|
|
I2C_ARGREG(arg),
|
|
I2C_ARGVALUE(arg)));
|
|
|
|
return i2c_writereg(I2C_ARGSLAVE(arg),
|
|
I2C_ARGREG(arg),
|
|
I2C_ARGVALUE(arg));
|
|
case I2C_READREG:
|
|
{
|
|
unsigned char val;
|
|
/* read from an i2c slave */
|
|
D(printk("i2cr %d %d ",
|
|
I2C_ARGSLAVE(arg),
|
|
I2C_ARGREG(arg)));
|
|
val = i2c_readreg(I2C_ARGSLAVE(arg), I2C_ARGREG(arg));
|
|
D(printk("= %d\n", val));
|
|
return val;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations i2c_fops = {
|
|
.owner = THIS_MODULE,
|
|
.ioctl = i2c_ioctl,
|
|
.open = i2c_open,
|
|
.release = i2c_release,
|
|
};
|
|
|
|
int __init
|
|
i2c_init(void)
|
|
{
|
|
static int res = 0;
|
|
static int first = 1;
|
|
|
|
if (!first) {
|
|
return res;
|
|
}
|
|
first = 0;
|
|
|
|
/* Setup and enable the Port B I2C interface */
|
|
|
|
#ifndef CONFIG_ETRAX_I2C_USES_PB_NOT_PB_I2C
|
|
if ((res = cris_request_io_interface(if_i2c, "I2C"))) {
|
|
printk(KERN_CRIT "i2c_init: Failed to get IO interface\n");
|
|
return res;
|
|
}
|
|
|
|
*R_PORT_PB_I2C = port_pb_i2c_shadow |=
|
|
IO_STATE(R_PORT_PB_I2C, i2c_en, on) |
|
|
IO_FIELD(R_PORT_PB_I2C, i2c_d, 1) |
|
|
IO_FIELD(R_PORT_PB_I2C, i2c_clk, 1) |
|
|
IO_STATE(R_PORT_PB_I2C, i2c_oe_, enable);
|
|
|
|
port_pb_dir_shadow &= ~IO_MASK(R_PORT_PB_DIR, dir0);
|
|
port_pb_dir_shadow &= ~IO_MASK(R_PORT_PB_DIR, dir1);
|
|
|
|
*R_PORT_PB_DIR = (port_pb_dir_shadow |=
|
|
IO_STATE(R_PORT_PB_DIR, dir0, input) |
|
|
IO_STATE(R_PORT_PB_DIR, dir1, output));
|
|
#else
|
|
if ((res = cris_io_interface_allocate_pins(if_i2c,
|
|
'b',
|
|
CONFIG_ETRAX_I2C_DATA_PORT,
|
|
CONFIG_ETRAX_I2C_DATA_PORT))) {
|
|
printk(KERN_WARNING "i2c_init: Failed to get IO pin for I2C data port\n");
|
|
return res;
|
|
} else if ((res = cris_io_interface_allocate_pins(if_i2c,
|
|
'b',
|
|
CONFIG_ETRAX_I2C_CLK_PORT,
|
|
CONFIG_ETRAX_I2C_CLK_PORT))) {
|
|
cris_io_interface_free_pins(if_i2c,
|
|
'b',
|
|
CONFIG_ETRAX_I2C_DATA_PORT,
|
|
CONFIG_ETRAX_I2C_DATA_PORT);
|
|
printk(KERN_WARNING "i2c_init: Failed to get IO pin for I2C clk port\n");
|
|
}
|
|
#endif
|
|
|
|
return res;
|
|
}
|
|
|
|
static int __init
|
|
i2c_register(void)
|
|
{
|
|
int res;
|
|
|
|
res = i2c_init();
|
|
if (res < 0)
|
|
return res;
|
|
res = register_chrdev(I2C_MAJOR, i2c_name, &i2c_fops);
|
|
if(res < 0) {
|
|
printk(KERN_ERR "i2c: couldn't get a major number.\n");
|
|
return res;
|
|
}
|
|
|
|
printk(KERN_INFO "I2C driver v2.2, (c) 1999-2004 Axis Communications AB\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* this makes sure that i2c_register is called during boot */
|
|
|
|
module_init(i2c_register);
|
|
|
|
/****************** END OF FILE i2c.c ********************************/
|