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Date: Mon, 10 Dec 2012 11:04:16 -0500
From: Adam Jackson <ajax@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Arthur Taylor <art@...ed.ca>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] vt: Add VC_MUTE (v2)
The "don't enqueue stuff" semantics of K_OFF shouldn't be a function of
the keyboard map state; we should be able to switch among cooked/raw/
unicode without changing whether events are delivered. Otherwise - if
changing to K_UNICODE undoes K_OFF - then suddenly Alt-F2 under
Gnome will switch VT instead of summoning the "run command" dialog.
Add a new KD[GS]KBMUTE ioctl pair that allows events to be muted
independently of map state.
v2: Leave K_OFF in place at Alan's suggestion.
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=859485
Cc: Arthur Taylor <art@...ed.ca>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Tested-by: Josh Boyer <jwboyer@...hat.com>
Signed-off-by: Adam Jackson <ajax@...hat.com>
---
drivers/tty/vt/keyboard.c | 42 ++++++++++++++++++++++++++++++++++++++----
drivers/tty/vt/vt_ioctl.c | 13 +++++++++++++
include/linux/kbd_kern.h | 3 ++-
include/linux/vt_kern.h | 2 ++
include/uapi/linux/kd.h | 4 ++++
5 files changed, 59 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 681765b..20ebdad 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -642,6 +642,11 @@ static void fn_null(struct vc_data *vc)
do_compute_shiftstate();
}
+static bool kbd_is_muted(void)
+{
+ return (kbd->kbdmode == VC_OFF) || vc_kbd_mode(kbd, VC_MUTE);
+}
+
/*
* Special key handlers
*/
@@ -657,7 +662,7 @@ static void k_spec(struct vc_data *vc, unsigned char value, char up_flag)
return;
if ((kbd->kbdmode == VC_RAW ||
kbd->kbdmode == VC_MEDIUMRAW ||
- kbd->kbdmode == VC_OFF) &&
+ kbd_is_muted())
value != KVAL(K_SAK))
return; /* SAK is allowed even in raw mode */
fn_handler[value](vc);
@@ -1381,7 +1386,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
if (rc == NOTIFY_STOP)
return;
- if ((raw_mode || kbd->kbdmode == VC_OFF) && type != KT_SPEC && type != KT_SHIFT)
+ if ((raw_mode || kbd_is_muted()) && type != KT_SPEC && type != KT_SHIFT)
return;
(*k_handler[type])(vc, keysym & 0xff, !down);
@@ -1742,6 +1747,30 @@ int vt_do_kdskbmode(int console, unsigned int arg)
}
/**
+ * vt_do_kdskbmute - set keyboard event mute
+ * @console: the console to use
+ * @arg: the requested mode
+ *
+ * Update the keyboard mute state while holding the correct locks.
+ * Return 0 for success or an error code.
+ */
+int vt_do_kdskbmute(int console, unsigned int arg)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kbd_event_lock, flags);
+ if (arg)
+ set_vc_kbd_mode(kbd, VC_MUTE);
+ else
+ clr_vc_kbd_mode(kbd, VC_MUTE);
+ spin_unlock_irqrestore(&kbd_event_lock, flags);
+ return ret;
+}
+
+
+/**
* vt_do_kdskbmeta - set keyboard meta state
* @console: the console to use
* @arg: the requested meta state
@@ -2068,13 +2097,18 @@ int vt_do_kdgkbmode(int console)
return K_MEDIUMRAW;
case VC_UNICODE:
return K_UNICODE;
- case VC_OFF:
- return K_OFF;
default:
return K_XLATE;
}
}
+int vt_do_kdgkbmute(int console)
+{
+ struct kbd_struct * kbd = kbd_table + console;
+ /* This is a spot read so needs no locking */
+ return vc_kbd_mode(kbd, VC_MUTE);
+}
+
/**
* vt_do_kdgkbmeta - report meta status
* @console: console to report
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index b841f56..f0951e2 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -477,6 +477,19 @@ int vt_ioctl(struct tty_struct *tty,
ret = put_user(uival, (int __user *)arg);
break;
+ case KDSKBMUTE:
+ if (!perm)
+ return -EPERM;
+ ret = vt_do_kdskbmute(console, arg);
+ if (ret == 0)
+ tty_ldisc_flush(tty);
+ break;
+
+ case KDGKBMUTE:
+ uival = vt_do_kdgkbmute(console);
+ ret = put_user(uival, (int __user *)arg);
+ break;
+
/* this could be folded into KDSKBMODE, but for compatibility
reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
case KDSKBMETA:
diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index b7c8cdc..18c0a45 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -55,12 +55,13 @@ struct kbd_struct {
#define VC_UNICODE 3 /* Unicode mode */
#define VC_OFF 4 /* disabled mode */
- unsigned char modeflags:5;
+ unsigned char modeflags:6;
#define VC_APPLIC 0 /* application key mode */
#define VC_CKMODE 1 /* cursor key mode */
#define VC_REPEAT 2 /* keyboard repeat */
#define VC_CRLF 3 /* 0 - enter sends CR, 1 - enter sends CRLF */
#define VC_META 4 /* 0 - meta, 1 - meta=prefix with ESC */
+#define VC_MUTE 5 /* don't generate events */
};
extern int kbd_init(void);
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 50ae7d0..a886915 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -168,6 +168,7 @@ extern void hide_boot_cursor(bool hide);
/* keyboard provided interfaces */
extern int vt_do_diacrit(unsigned int cmd, void __user *up, int eperm);
+extern int vt_do_kdskbmute(int console, unsigned int arg);
extern int vt_do_kdskbmode(int console, unsigned int arg);
extern int vt_do_kdskbmeta(int console, unsigned int arg);
extern int vt_do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc,
@@ -177,6 +178,7 @@ extern int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe,
extern int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb,
int perm);
extern int vt_do_kdskled(int console, int cmd, unsigned long arg, int perm);
+extern int vt_do_kdgkbmute(int console);
extern int vt_do_kdgkbmode(int console);
extern int vt_do_kdgkbmeta(int console);
extern void vt_reset_unicode(int console);
diff --git a/include/uapi/linux/kd.h b/include/uapi/linux/kd.h
index 87b7cc4..ce08f6a 100644
--- a/include/uapi/linux/kd.h
+++ b/include/uapi/linux/kd.h
@@ -150,6 +150,10 @@ struct kbd_repeat {
/* earlier this field was misnamed "rate" */
};
+/* get/set event mute */
+#define KDGKBMUTE 0x4B50
+#define KDSKBMUTE 0x4B51
+
#define KDKBDREP 0x4B52 /* set keyboard delay/repeat rate;
* actually used values are returned */
--
1.7.11.7
--
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