[PATCH] xfree86: if AllowEmptyInput is true, enable RAW mode on the console.

[Peter Hutterer]

Usually, the console is set to RAW in the kbd driver. If we hotplug all input
devices (i.e. the evdev driver for keyboards), the console is left as-is.
As a result, the evdev driver must put an EVIOCGRAB on the device to avoid
characters leaking onto the console. This again breaks many things, amongst
them lirc, in-kernel mouse button emulation and HAL.

This patch sets the console to RAW if AllowEmptyInput is on.

Use-cases:
1. AEI is off
  1.1. Only kbd driver is used - behaviour as-is.
  1.2. kbd and evdev driver is used: if evdev does not grab the device,
       duplicate events are generated.
2. AEI is on
  2.1. Only evdev driver is used - behaviour as-is, but evdev does not need
       to grab the device anymore.
  2.2. evdev and kbd are used: duplicate key events are generated if evdev
       does not grab the device.

1.2 is a marginal use-case that can be fixed by adding a "grab" option to the
evdev driver (update of xorg.conf is needed).

2.2 is an issue. If we have no ServerLayout section, AEI is on, but devices
specified in the xorg.conf are still added [1], resulting in duplicate events.
This is a common configuration and needs sorting out.

[1] 2eaed4a10fe5bf727579bca4ab8d4a47c8763a7d
---
 hw/xfree86/os-support/linux/lnx_init.c |   35 +++++++++++++++++++++++++++++++-
 1 files changed, 34 insertions(+), 1 deletions(-)

diff --git a/hw/xfree86/os-support/linux/lnx_init.c b/hw/xfree86/os-support/linux/lnx_init.c
index 4c36b7c..6136429 100644
--- a/hw/xfree86/os-support/linux/lnx_init.c
+++ b/hw/xfree86/os-support/linux/lnx_init.c
@@ -53,6 +53,8 @@ static int activeVT = -1;
 
 static int vtPermSave[4];
 static char vtname[11];
+static struct termios tty_attr; /* tty state to restore */
+static int tty_mode; /* kbd mode to restore */
 
 static int
 saveVtPerms(void)
@@ -272,6 +274,34 @@ xf86OpenConsole(void)
 	        FatalError("xf86OpenConsole: KDSETMODE KD_GRAPHICS failed %s\n",
 		           strerror(errno));
 
+	    /* Set the keyboard to RAW mode. If we're using the keyboard
+	     * driver, the driver does it for us. If we have AEI on, then
+	     * we're expecting the devices to be added (i.e. evdev) and we
+	     * have to set it manually.
+	     */
+	    if (xf86Info.allowEmptyInput)
+	    {
+		struct termios nTty;
+
+		if (ioctl(xf86Info.consoleFd, KDSKBMODE, K_RAW) < 0)
+		    FatalError("xf86OpenConsole: KDSKBMODE K_RAW failed %s\n",
+			    strerror(errno));
+
+		ioctl(xf86Info.consoleFd, KDGKBMODE, &tty_mode);
+		tcgetattr(xf86Info.consoleFd, &tty_attr);
+
+		nTty = tty_attr;
+		nTty.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP);
+		nTty.c_oflag = 0;
+		nTty.c_cflag = CREAD | CS8;
+		nTty.c_lflag = 0;
+		nTty.c_cc[VTIME]=0;
+		nTty.c_cc[VMIN]=1;
+		cfsetispeed(&nTty, 9600);
+		cfsetospeed(&nTty, 9600);
+		tcsetattr(xf86Info.consoleFd, TCSANOW, &nTty);
+	    }
+
 	    /* we really should have a InitOSInputDevices() function instead
 	     * of Init?$#*&Device(). So I just place it here */
 	
@@ -328,7 +358,10 @@ xf86CloseConsole()
     if (ioctl(xf86Info.consoleFd, KDSETMODE, KD_TEXT) < 0)
 	xf86Msg(X_WARNING, "xf86CloseConsole: KDSETMODE failed: %s\n",
 		strerror(errno));
-	
+
+    ioctl(xf86Info.consoleFd, KDSKBMODE, tty_mode);
+    tcsetattr(xf86Info.consoleFd, TCSANOW, &tty_attr);
+
     if (ioctl(xf86Info.consoleFd, VT_GETMODE, &VT) < 0) 
 	xf86Msg(X_WARNING, "xf86CloseConsole: VT_GETMODE failed: %s\n",
 		strerror(errno));
-- 
1.6.0.1

Cheers,
  Peter