static long i2c_ioctl(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(KERN_DEBUG "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(KERN_DEBUG "i2cr %d %d ",
I2C_ARGSLAVE(arg),
I2C_ARGREG(arg)));
val = i2c_readreg(I2C_ARGSLAVE(arg), I2C_ARGREG(arg));
D(printk(KERN_DEBUG "= %d\n", val));
return val;
}
default:
return -EINVAL;
}
return 0;
}
static long
i2c_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int ret;
if(_IOC_TYPE(cmd) != ETRAXI2C_IOCTYPE) {
return -ENOTTY;
}
switch (_IOC_NR(cmd)) {
case I2C_WRITEREG:
D(printk("i2cw %d %d %d\n",
I2C_ARGSLAVE(arg),
I2C_ARGREG(arg),
I2C_ARGVALUE(arg)));
mutex_lock(&i2c_mutex);
ret = i2c_writereg(I2C_ARGSLAVE(arg),
I2C_ARGREG(arg),
I2C_ARGVALUE(arg));
mutex_unlock(&i2c_mutex);
return ret;
case I2C_READREG:
{
unsigned char val;
D(printk("i2cr %d %d ",
I2C_ARGSLAVE(arg),
I2C_ARGREG(arg)));
mutex_lock(&i2c_mutex);
val = i2c_readreg(I2C_ARGSLAVE(arg), I2C_ARGREG(arg));
mutex_unlock(&i2c_mutex);
D(printk("= %d\n", val));
return val;
}
default:
return -EINVAL;
}
return 0;
}
/*#---------------------------------------------------------------------------
*#
*# FUNCTION NAME: i2c_ioctl
*#
*# DESCRIPTION : Main device API: ioctl's to write/read
*# to/from i2c registers
*#
*# PARAMETERS : *inode: reference to inode
*# *filp : reference to file pointer
*# cmd : command to be executed during the ioctl call
*# arg : pointer to a structure with the data???
*#
*# RETURN : result of the ioctl call
*#
*#---------------------------------------------------------------------------
*/
static int i2c_ioctl( struct inode *inode
, struct file *file
, unsigned int cmd
, unsigned long arg
)
{
/* the acme ioctls */
I2C_DATA i2cdata;
int RetVal = EI2CNOERRORS;
if ( _IOC_TYPE( cmd ) != ETRAXI2C_IOCTYPE )
{
return ( -EINVAL );
}
switch ( _IOC_NR( cmd ) )
{
case I2C_WRITEREG:
/* write to an i2c slave */
RetVal = i2c_writereg( I2C_ARGSLAVE( arg )
, I2C_ARGREG( arg )
, I2C_ARGVALUE( arg )
);
break;
case I2C_READREG:
RetVal = i2c_readreg( I2C_ARGSLAVE( arg ), I2C_ARGREG( arg ) );
break;
/* New functions added by GVC */
case I2C_READ:
copy_from_user( (char*)&i2cdata, (char*)arg, sizeof( I2C_DATA ) );
{
int RetryCntr = MAXRETRIES;
do
{
RetVal = i2c_command( i2cdata.slave
, NULL
, 0
, i2cdata.rbuf
, i2cdata.rlen
);
} while ( ( EI2CNOERRORS != RetVal )
&&( --RetryCntr )
);
}
copy_to_user( (char*)arg, (char*)&i2cdata, sizeof( I2C_DATA ) );
break;
case I2C_WRITE:
copy_from_user( (char*)&i2cdata, (char*)arg, sizeof( I2C_DATA ) );
{
int RetryCntr = MAXRETRIES;
do
{
RetVal = i2c_command( i2cdata.slave
, i2cdata.wbuf
, i2cdata.wlen
, NULL
, 0
);
} while ( ( EI2CNOERRORS != RetVal )
&&( --RetryCntr )
);
}
break;
case I2C_WRITEREAD:
copy_from_user( (char*)&i2cdata, (char*)arg, sizeof( I2C_DATA ) );
{
int RetryCntr = MAXRETRIES;
do
{
RetVal = i2c_command( i2cdata.slave
, i2cdata.wbuf
, i2cdata.wlen
, i2cdata.rbuf
, i2cdata.rlen
);
} while ( ( EI2CNOERRORS != RetVal )
&&( --RetryCntr )
);
}
copy_to_user( (char*)arg, (char*)&i2cdata, sizeof( I2C_DATA ) );
break;
default:
RetVal = -EINVAL;
}
return ( -RetVal );
} /* i2c_ioctl */