staging: speakup: add send_xchar, tiocmset and input functionality for tty

[Samuel Thibault]

Okash Khawaja, on ven. 28 avril 2017 21:54:48 +0100, wrote:
> +static int spk_ttyio_receive_buf2(struct tty_struct *tty,
> +		const unsigned char *cp, char *fp, int count)
> +{
> +	struct spk_ldisc_data *ldisc_data = (struct spk_ldisc_data *)tty->disc_data;

> +static unsigned char ttyio_in(int timeout)
> +{
> +	struct spk_ldisc_data *ldisc_data =
> +		(struct spk_ldisc_data *)speakup_tty->disc_data;

No need to make an explicit cast: disc_data is a void*, so the implicit
cast is fine and more readable ; only a C++ compiler would complain
about it.

Apart from that it looks good.

So I guess now we need to be more pushy with serdev.

Samuel