From: Pavel Machek <pavel@ucw.cz>
To: kernel list <linux-kernel@vger.kernel.org>, vojtech@ucw.cz
Subject: Blank-screen-on-demand
Date: Tue, 18 Mar 2003 21:32:22 +0100 [thread overview]
Message-ID: <20030318203222.GA165@elf.ucw.cz> (raw)
Hi!
This allows user to blank screen on demand. On some machines (philips
velo) backlight takes more energy than rest of system, and this
becomes pretty critical.
Vojtech, are you right person for this? If so please apply. [wow, that
patch is 6 years old ;-)]
Pavel
Index: linux-quilt/drivers/char/keyboard.c
--- .pc/misc/drivers/char/keyboard.c 2003-03-18 18:34:12.000000000 +0100
+++ a/drivers/char/keyboard.c 2003-03-16 18:51:05.000000000 +0100
@@ -20,6 +20,7 @@
* parts by Geert Uytterhoeven, May 1997
*
* 27-05-97: Added support for the Magic SysRq Key (Martin Mares)
+ * 29-07-97: Added blank console key (Pavel Machek)
* 30-07-98: Dead keys redone, aeb@cwi.nl.
* 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
*/
@@ -86,7 +87,8 @@
fn_show_state, fn_send_intr, fn_lastcons, fn_caps_toggle,\
fn_num, fn_hold, fn_scroll_forw, fn_scroll_back,\
fn_boot_it, fn_caps_on, fn_compose, fn_SAK,\
- fn_dec_console, fn_inc_console, fn_spawn_con, fn_bare_num
+ fn_dec_console, fn_inc_console, fn_spawn_con, fn_bare_num, \
+ fn_blank_now
typedef void (fn_handler_fn)(struct vc_data *vc, struct pt_regs *regs);
static fn_handler_fn FN_HANDLERS;
@@ -320,6 +322,25 @@
con_schedule_flip(tty);
}
+static void blank_now_do(unsigned long unused)
+{
+ do_poke_blanked_console = 0;
+ do_blank_screen(0);
+}
+
+static struct timer_list blank_now_timer;
+
+static void fn_blank_now(struct vc_data *vc, struct pt_regs *regs)
+{
+ /* You ask why we have our own timer here? Well, it is because
+ we do not want user's release of keys to unblank
+ immediately. Even if we correctly guessed what is press and
+ what is release, thinkpad's broken bios will turn on
+ backlight for us... <pavel@ucw.cz> */
+ blank_now_timer.expires = jiffies + HZ;
+ add_timer(&blank_now_timer);
+}
+
static void applkey(struct vc_data *vc, int key, char mode)
{
static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
@@ -1215,6 +1258,9 @@
{
int i;
+ init_timer(&blank_now_timer);
+ blank_now_timer.function = blank_now_do;
+
kbd0.ledflagstate = kbd0.default_ledflagstate = KBD_DEFLEDS;
kbd0.ledmode = LED_SHOW_FLAGS;
kbd0.lockstate = KBD_DEFLOCK;
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
reply other threads:[~2003-03-18 22:11 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20030318203222.GA165@elf.ucw.cz \
--to=pavel@ucw.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=vojtech@ucw.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®