[patch 6/6] staging: speakup: Migrate acntsa, bns, dectlk and txprt to ttyio

[Samuel Thibault]

Last but not least, there are the outb(CLEAR) in speakup_audptr.c and
speakup_spkout. I'd say the following:

- add spk_serial_send_xchar(char ch) which does

  outb(ch, speakup_info.port_tts);

- add spk_ttyio_send_xchar(char ch) which does

  speakup_tty->ops->send_xchar(speakup_tty, ch)

and make these a send_xchar method of synths.

Then, in speakup_audptr.c, replace the content of synth_flush() with
synth->send_xchar(SYNTH_CLEAR) + the last line unmodified (synth->serial_out(PROCSPEECH);)

and in speakup_spkout.c, replace the content of synth_flush() with just
synth->send_xchar(SYNTH_CLEAR);

and we should be done with replacing in[bwl]/out[bwl]!
(except the internal synth (acntpc, decpc, keypc, dtlk))

Samuel