How to port the tty driver from linux3.0 to linux2.6.14

For how to port the tty driver from linux3.0 to linux2.6.14, Linux general technology-Linux programming and kernel information, see the following for details. In the linux-2.6.30 version, tty_flip.h
Extern int tty_buffer_request_room (struct tty_struct * tty, size_t size );
Extern int tty_insert_flip_string_flags (struct tty_struct * tty, const unsigned char * chars, const char * flags, size_t size );
Extern int tty_insert_flip_string_fixed_flag (struct tty_struct * tty, const unsigned char * chars, char flag, size_t size );
Extern int tty_prepare_flip_string (struct tty_struct * tty, unsigned char ** chars, size_t size );
Extern int tty_prepare_flip_string_flags (struct tty_struct * tty, unsigned char ** chars, char ** flags, size_t size );
Void tty_schedule_flip (struct tty_struct * tty );
Static inline int tty_insert_flip_char (struct tty_struct * tty,
Unsigned char ch, char flag)
{
Struct tty_buffer * tb = tty-> buf. tail;
If (tb & tb-> used <tb-> size ){
Tb-> flag_buf_ptr [tb-> used] = flag;
Tb-> char_buf_ptr [tb-> used ++] = ch;
Return 1;
}
Return tty_insert_flip_string_flags (tty, & ch, & flag, 1 );
}

Static inline int tty_insert_flip_string (struct tty_struct * tty, const unsigned char * chars, size_t size)
{
Return tty_insert_flip_string_fixed_flag (tty, chars, TTY_NORMAL, size );
}


Tty_flip.h file in linux-2.6.14 version
# Ifndef _ LINUX_TTY_FLIP_H
# Define _ LINUX_TTY_FLIP_H

# Ifdef INCLUDE_INLINE_FUNCS
# Define _ INLINE _ extern
# Else
# Define _ INLINE _ static _ inline __
# Endif

_ INLINE _ void tty_insert_flip_char (struct tty_struct * tty,
Unsigned char ch, char flag)
{
If (tty-> flip. count <TTY_FLIPBUF_SIZE ){
Tty-> flip. count ++;
* Tty-> flip. flag_buf_ptr ++ = flag;
* Tty-> flip. char_buf_ptr ++ = ch;
}
}

_ INLINE _ void tty_schedule_flip (struct tty_struct * tty)
{
Schedule_delayed_work (& tty-> flip. work, 1 );
}

The current tty driver is ported from the linux-2.6.30 version to the linux-2.6.14 version, which requires the tty_insert_flip_string interface, but this interface calls the following interface
Tty_insert_flip_string_fixed_flag
Tty_buffer_request_room
Tty_buffer_find
These interfaces are not intended to Port tty_insert_flip_string to the kernel of 2.6.14 in 2.6.14. what do you need to do?
Thank you!