Re: [RFC][PATCH] "Disable Trackpad while typing" on Notebooks withh aPS/2 Trackpad

From: Hans-Georg Thien (1682-600@onlinehome.de)
Date: Tue May 27 2003 - 15:50:35 EST

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Hans-Georg Thien wrote:
> The short story
> ---------------
> Apple MacIntosh iBook Notebooks computers have a nice feature that
> prevents unintended trackpad input while typing on the keyboard. There
> are no mouse-moves or mouse-taps for a short period of time after each
> keystroke. I wanted to have this feature on my i386 notebook ...

It it is now possible to adjust some settings via

echo ???? > /proc/tty/ps2-trackpad

(1) Set the delay time to 2 Secs (default is 10 ==> 1 Sec)

echo "delay 20" > /proc/tty/ps2-trackpad

(2) Completely disable the trackpad (default 0). Useful if you plug in an external mouse.

echo "disable 1" > /proc/tty/ps2-trackpad

(3) Escape the keyboard scancode for a key. These scancodes are
passed without a delay. (defaults are the scancodes for CTRL and SHIFT
keys).

This is useful for some applications ( like xterm ) which are using keydown events in combination with mouseclick events.

You can use showkey -s to find out the scancodes of your own keys.
To unescape a scancode you must apply that scancode twice! For keys with multiple scancodes you must use the *last* generated scancode.

Example: define an escape for HOME-KeyDown

echo "escape 0x047" > /proc/tty/ps2-trackpad

--- /usr/src/linux-2.4.20/Documentation/Configure.help Fri Nov 29 00:53:08 2002
+++ /usr/src/linux/Documentation/Configure.help Wed May 28 00:04:44 2003
@@ -17752,6 +17752,44 @@
<ftp://gnu.systemy.it/pub/gpm/>) solves this problem, or you can get
the "mconv2" utility from <ftp://ibiblio.org/pub/Linux/system/mouse/>.

+Disable trackpad while typing
+CONFIG_DISABLE_TRACKPAD_WHILE_TYPING
+ For people with a notebook that have a build in trackpad.
+
+ It prevents unintended mouse moves and mouse taps while typing on
+ the notebook keyboard.
+
+ The majority of notebooks on the market have a PS/2 trackpad.
+ So you will probably say "Y" if you have a notebook with a trackpad.
+
+ Also note that you can control the behaviour of the trackpad via the
+ /proc/tty/ps2-trackpad file, e.g.
+
+ Set the delay time to 2 Secs (default is 10 ==> 1 Sec)
+
+ echo "delay 20" > /proc/tty/ps2-trackpad
+
+
+ Completely disable the trackpad (default 0). Useful if you plug in an
+ external mouse.
+
+ echo "disable 1" > /proc/tty/ps2-trackpad
+
+
+ Escape the keyboard scancode for the key. These scancodes are passed
+ without a delay. (defaults are the scancodes for CTRL and SHIFT keys).
+
+ This is useful for some applications ( like xterm ) which are using
+ keydown-click events.
+
+ You can use showkey -s to find out the scancodes of your own keys.
+ Apply "escape 0x0??" twice to unescape a scancode. For keys with
+ multiple scancodes you must use the *last* generated scancode.
+
+ Example: define an escape for HOME-KeyDown
+
+ echo "escape 0x047" > /proc/tty/ps2-trackpad
+
C&T 82C710 mouse port support (as on TI Travelmate)
CONFIG_82C710_MOUSE
This is a certain kind of PS/2 mouse used on the TI Travelmate. If
--- /usr/src/linux-2.4.20/drivers/char/Config.in Fri Nov 29 00:53:12 2002
+++ /usr/src/linux/drivers/char/Config.in Thu May 1 02:30:45 2003
@@ -170,6 +170,13 @@
tristate 'Mouse Support (not serial and bus mice)' CONFIG_MOUSE
if [ "$CONFIG_MOUSE" != "n" ]; then
bool ' PS/2 mouse (aka "auxiliary device") support' CONFIG_PSMOUSE
+
+ if [ "$CONFIG_PSMOUSE" = "y" ]
+ then
+ bool ' Disable Trackpad while typing on Notebooks' CONFIG_DISABLE_TRACKPAD_WHILE_TYPING
+ fi
+
+
tristate ' C&T 82C710 mouse port support (as on TI Travelmate)' CONFIG_82C710_MOUSE
tristate ' PC110 digitizer pad support' CONFIG_PC110_PAD
tristate ' MK712 touch screen support' CONFIG_MK712_MOUSE
--- /usr/src/linux-2.4.20/drivers/char/pc_keyb.c Fri Nov 29 00:53:12 2002
+++ /usr/src/linux/drivers/char/pc_keyb.c Tue May 27 23:08:46 2003
@@ -13,6 +13,11 @@
* Code fixes to handle mouse ACKs properly.
* C. Scott Ananian <cananian@xxxxxxxxxxxxxxxxxxxx> 1999-01-29.
*
+ * Implemented the "disable trackpad while typing" feature. This prevents
+ * unintended mouse moves and mouse taps while typing on the keyboard on
+ * notebooks with a PS/2 trackpad.
+ * Hans-Georg Thien <1682-600@xxxxxxxxxxxxx> 2003-04-30.
+ *
*/

#include <linux/config.h>
@@ -35,7 +40,7 @@
#include <linux/smp_lock.h>
#include <linux/kd.h>
#include <linux/pm.h>
-
+#include <linux/proc_fs.h>
#include <asm/keyboard.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
@@ -102,6 +107,125 @@
#define MAX_RETRIES 60 /* some aux operations take long time*/
#endif /* CONFIG_PSMOUSE */

+#ifdef CONFIG_DISABLE_TRACKPAD_WHILE_TYPING
+
+static int last_kbd_event = 0; /* timestamp of last kbd event */
+static int last_kbd_scancode = 0;
+static int trackpad_disable = 0;
+static int trackpad_delay = HZ; /* default delay is 1Sec */
+
+static unsigned char trackpad_escape[256/8]; /* 256-Bit vector of keyboard scancodes to ignore */
+
+
+static int trackpad_write_proc(struct file *file,
+ const char *buf,
+ unsigned long len,
+ void *data)
+{
+
+/*
+ * handle write requests to /proc/tty/ps2-trackpad
+ */
+ char lbuf[32];
+ int tmp;
+ int success = 0;
+
+ if (len > sizeof(lbuf)-1) return -EINVAL;
+
+ if (copy_from_user(lbuf, buf, len)) return -EFAULT;
+
+ lbuf[len] = '\0';
+
+ if (sscanf(lbuf, "delay %d", &tmp)) {
+ trackpad_delay = (tmp * HZ) / 10; /* convert 1/10Sec to jiffies */
+ success=1;
+ }
+
+ if (sscanf(lbuf, "disable %d", &tmp)) {
+ trackpad_disable = tmp ? 1 : 0;
+ success=1;
+ }
+
+ if (sscanf(lbuf, "escape 0x%x", &tmp)) {
+ if ((tmp < 0) || (tmp > 255)) return -EINVAL;
+ change_bit(tmp, trackpad_escape);
+ success=1;
+ }
+
+ if (!success) return -EINVAL;
+
+ return len;
+}
+
+static int trackpad_read_proc(char *buf, char **start, off_t ofs,
+ int count, int *eof, void *data)
+{
+
+/*
+ * handle read requests to /proc/tty/ps2-trackpad
+ */
+
+ int len = 0;
+ int i;
+
+ len += sprintf(buf+len, "delay %d\n",
+ (trackpad_delay * 10) / HZ); /* convert jiffies to 1/10Sec */
+ len += sprintf(buf+len, "disable %d\n", trackpad_disable);
+
+ for (i = 0; i < sizeof(trackpad_escape) * 8; i++) {
+ if (test_bit(i, trackpad_escape)) {
+ len += sprintf(buf+len, "escape 0x0%x\n", i);
+ }
+ }
+
+ *eof = 1;
+ buf[len+1] = '\0';
+ return len;
+}
+
+static int trackpad_config_setup(void)
+{
+
+/*
+ * create read-write entries in /proc/tty/ps2-trackpad and setup some
+ * defaults for the trackpad handling
+ */
+
+ struct proc_dir_entry *trackpad_proc_entry;
+
+ trackpad_proc_entry=create_proc_entry("tty/ps2-trackpad", 0, NULL);
+
+ if (trackpad_proc_entry == NULL) return -1;
+
+ trackpad_proc_entry->mode |= S_IWUGO;
+ trackpad_proc_entry->read_proc = trackpad_read_proc;
+ trackpad_proc_entry->write_proc = trackpad_write_proc;
+
+
+ /* set keyboard scancodes to ignore */
+ memset(trackpad_escape, 0, sizeof(trackpad_escape));
+ set_bit(0x1d, trackpad_escape); /* CTRL-L/CTRL-R keydown */
+ set_bit(0x2a, trackpad_escape); /* SHIFT-L keydown */
+ set_bit(0x36, trackpad_escape); /* SHIFT-R keydown */
+#if 0
+ set_bit(0x38, trackpad_escape); /* ALT-L/ALT-R keydown */
+ set_bit(0x01, trackpad_escape); /* ESC keydown */
+ set_bit(0x47, trackpad_escape); /* HOME keydown */
+ set_bit(0x48, trackpad_escape); /* CURSORUP keydown */
+ set_bit(0x49, trackpad_escape); /* PAGEUP keydown */
+ set_bit(0x4b, trackpad_escape); /* CURSOR-L keydown */
+ set_bit(0x4d, trackpad_escape); /* CURSOR-R keydown */
+ set_bit(0x4f, trackpad_escape); /* END keydown */
+ set_bit(0x50, trackpad_escape); /* CURSORDOWN keydown */
+ set_bit(0x51, trackpad_escape); /* PAGEDOWN keydown */
+ set_bit(0x5d, trackpad_escape); /* MENU keydown */
+#endif
+
+ return 0;
+}
+
+#endif /* CONFIG_DISABLE_TRACKPAD_WHILE_TYPING */
+
/*
* Wait for keyboard controller input buffer to drain.
*
@@ -449,6 +573,15 @@
return;
}

+#ifdef CONFIG_DISABLE_TRACKPAD_WHILE_TYPING
+ if (trackpad_disable) return;
+
+ if (!test_bit(last_kbd_scancode, trackpad_escape)) {
+ /* do nothing if time since last kbd event is less then trackpad_delay */
+ if (abs(jiffies - last_kbd_event) < trackpad_delay) return;
+ }
+#endif
+
prev_code = scancode;
add_mouse_randomness(scancode);
if (aux_count) {
@@ -469,6 +602,12 @@

static inline void handle_keyboard_event(unsigned char scancode)
{
+
+#ifdef CONFIG_DISABLE_TRACKPAD_WHILE_TYPING
+ last_kbd_event = jiffies;
+ last_kbd_scancode = scancode;
+#endif
+
#ifdef CONFIG_VT
kbd_exists = 1;
if (do_acknowledge(scancode))
@@ -1219,6 +1358,10 @@
kbd_write_command(KBD_CCMD_MOUSE_DISABLE); /* Disable aux device. */
kbd_write_cmd(AUX_INTS_OFF); /* Disable controller ints. */

+#ifdef CONFIG_DISABLE_TRACKPAD_WHILE_TYPING
+ trackpad_config_setup();
+#endif
+
return 0;
}

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