Commit bd63364c authored by Scot Doyle's avatar Scot Doyle Committed by Greg Kroah-Hartman
Browse files

vt: add cursor blink interval escape sequence 



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: default avatarScot Doyle <lkml14@scotdoyle.com>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ad909b3f

drivers/tty/vt/vt.c

+9 −0
Original line number Diff line number Diff line
@@ -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 */

			if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&

					vc->vc_par[1] <= USHRT_MAX)

				vc->vc_cur_blink_ms = vc->vc_par[1];

			else

				vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;

			break;

	}

}
@@ -1717,6 +1725,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear) 


	vc->vc_bell_pitch = DEFAULT_BELL_PITCH;

	vc->vc_bell_duration = DEFAULT_BELL_DURATION;

	vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;



	gotoxy(vc, 0, 0);

	save_cur(vc);

include/linux/console_struct.h

+1 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ struct vc_data { 
	unsigned int    vc_resize_user;         /* resize request from user */

	unsigned int	vc_bell_pitch;		/* Console bell pitch */

	unsigned int	vc_bell_duration;	/* Console bell duration */

	unsigned short	vc_cur_blink_ms;	/* Cursor blink duration */

	struct vc_data **vc_display_fg;		/* [!] Ptr to var holding fg console for this display */

	struct uni_pagedir *vc_uni_pagedir;

	struct uni_pagedir **vc_uni_pagedir_loc; /* [!] Location of uni_pagedir variable for this console */

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