Re: [PATCH 1/2] vt: add cursor blink interval escape sequence

Greg Kroah-Hartman
2015-03-25T11:19:49Z

On Fri, Feb 27, 2015 at 07:13:48PM +0000, Scot Doyle wrote:
> Add an escape sequence to specify the current console's cursor blink
> interval. The interval is specified as a number of milliseconds until
> the next cursor display state toggle, from 50 to 65535. /proc/loadavg
> did not show a difference with a one msec interval, but the lower
> bound is set to 50 msecs since slower hardware wasn't tested.
>
> Store the interval in the vc_data structure for later access by fbcon,
> initializing the value to fbcon's current hardcoded value of 200 msecs.
>
> Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> ---
> drivers/tty/vt/vt.c | 9 +++++++++
> include/linux/console_struct.h | 1 +
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index 6e00572..ab1f173 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -135,6 +135,7 @@ const struct consw *conswitchp;
> */
> #define DEFAULT_BELL_PITCH 750
> #define DEFAULT_BELL_DURATION (HZ/8)
> +#define DEFAULT_CURSOR_BLINK_MS 200
>
> struct vc vc_cons [MAX_NR_CONSOLES];
>
> @@ -1590,6 +1591,13 @@ static void setterm_command(struct vc_data *vc)
> case 15: /* activate the previous console */
> set_console(last_console);
> break;
> + case 16: /* set cursor blink duration in msec */

Where is this now documented? Is this a "standard" ASCII command
somewhere? Adding new userspace apis have to be documented properly.

Without that, I can't take this series, sorry.

greg k-h