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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: Scot Doyle <lkml14@scotdoyle.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 10 additions and 0 deletions
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@ -135,6 +135,7 @@ const struct consw *conswitchp;
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*/
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#define DEFAULT_BELL_PITCH 750
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#define DEFAULT_BELL_DURATION (HZ/8)
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#define DEFAULT_CURSOR_BLINK_MS 200
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struct vc vc_cons [MAX_NR_CONSOLES];
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@ -1590,6 +1591,13 @@ static void setterm_command(struct vc_data *vc)
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case 15: /* activate the previous console */
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set_console(last_console);
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break;
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case 16: /* set cursor blink duration in msec */
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if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
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vc->vc_par[1] <= USHRT_MAX)
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vc->vc_cur_blink_ms = vc->vc_par[1];
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else
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vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
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break;
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}
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}
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@ -1717,6 +1725,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
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vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
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vc->vc_bell_duration = DEFAULT_BELL_DURATION;
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vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
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gotoxy(vc, 0, 0);
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save_cur(vc);
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@ -104,6 +104,7 @@ struct vc_data {
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unsigned int vc_resize_user; /* resize request from user */
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unsigned int vc_bell_pitch; /* Console bell pitch */
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unsigned int vc_bell_duration; /* Console bell duration */
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unsigned short vc_cur_blink_ms; /* Cursor blink duration */
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struct vc_data **vc_display_fg; /* [!] Ptr to var holding fg console for this display */
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struct uni_pagedir *vc_uni_pagedir;
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struct uni_pagedir **vc_uni_pagedir_loc; /* [!] Location of uni_pagedir variable for this console */
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