Hi,
I am developing a driver which reads some data from the serial port in the
raw mode. For doing the same i do a call to which fails. The call to
our_ioctl for get serial data fails with return value -14 which is EBADADDR.
The same read works if we send a direct read request from an application to
our driver. However when we call the same thing from within the driver
module, it fails .
Please suggest a way for this.
The code is something like this
FILE * fp;
init_module()
{
fp = filp_open ("/dev/ttyS0", O_RDWR);
}
int our_read(struct file *filp, char *buf, size_t size, loff_t *off)
{
if (fp)
{
if (fp->f_op && fp->f_op->read)
retval = fp->f_op->read(filep,buf,size,&filep->f_pos);
}
}
int our_ioctl(struct inode *in, struct file *f, unsigned int cmd,
unsigned long arg)
{
switch (cmd)
{
case GET_SERIAL_DATA : return our_read(NULL, (char * ) arg,
MAX_READ, NULL);
break;
}
}
TIA
Harivansh S. Mehta
DCM Technologies Ltd.
India
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