Messages in this thread Patch in this message | | | From | Torsten Foertsch <> | Subject | Re: [PATCH] Disable Trackpad while typing | Date | Sun, 22 Jun 2003 19:05:09 +0200 |
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Here is now an improved version of the patch. It's against 2.4.21.
The following has changed from the original patch by Hans-Georg Thien <1682-600@onlinehome.de>:
- - mouse events are dropped in 12 byte chunks to better fit the PS/2 mouse protocol. That avoids spurious mouse events when the mouse is moving while the delay timer is being reached.
- - to disable the feature after pressing or releasing some particular keys (CTRL, SHIFT, ...) now keycodes instead of scancodes are used. "showkey -k" shows the correct values. The bit 0x100 is used to distinguish press and release events. 0 means press, 1 release. So,
escape 97 escape 29
mean disable "Disable Trackpad while typing" after pressing right and left CTRL (useful for xterm users). While
escape 353 # 97+256 escape 258 # 29+256
mean disable "Disable Trackpad while typing" after releasing right and left CTRL.
- - escaped keys are reported in /proc/tty/ps2-trackpad as decimal as "showkey - -k" also display them as decimal. On input sscanf( "%i" ) is expected.
- - Documentation has been moved from Documentation/Configure.help to a separate file Documentation/ps2-trackpad.txt.
History: http://marc.theaimsgroup.com/?l=linux-kernel&w=2&r=1&s=DISABLE_TRACKPAD_WHILE_TYPING&q=b
Torsten
diff -Naur -X dontdiff linux-2.4.21-orig/Documentation/Configure.help linux-2.4.21/Documentation/Configure.help - --- linux-2.4.21-orig/Documentation/Configure.help 2003-06-22 15:45:55.000000000 +0000 +++ linux-2.4.21/Documentation/Configure.help 2003-06-22 14:10:39.000000000 +0000 @@ -17964,6 +17964,21 @@ <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. + + See Documentation/ps2-trackpad.txt for detailed information. + 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 diff -Naur -X dontdiff linux-2.4.21-orig/Documentation/ps2-trackpad.txt linux-2.4.21/Documentation/ps2-trackpad.txt - --- linux-2.4.21-orig/Documentation/ps2-trackpad.txt 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.4.21/Documentation/ps2-trackpad.txt 2003-06-22 15:13:45.000000000 +0000 @@ -0,0 +1,50 @@ +For people with a notebook that have a build in trackpad. + +The "Disable trackpad while typing" feature 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 + +To completely disable this feature use + + echo "delay 0" > /proc/tty/ps2-trackpad + + +Escape the keyboard keycode for the key. After these keycodes mouse +events are passed without a delay. (defaults are the keycodes for +CTRL, SHIFT, ALT and MS-Windows (both left and right) and Menu +(Windows Taskbar) keys). + +This is useful for some applications ( like xterm ) which are using +keydown-click events. + +You can use showkey -k to find out the keycodes of your own keys. +Apply "escape ???" twice to unescape a keycode. + +Example: define an escape for HOME-KeyPress + + echo "escape 102" > /proc/tty/ps2-trackpad + +If you want to escape KeyRelease events add 0x100 (256) to the actual +keycode value. + + echo "escape 358" > /proc/tty/ps2-trackpad + +enables mouse events immediately after releasing HOME key. + +I can't imagine a situation where mouse events are needed immediately +after key release events but it's implemented for completeness. diff -Naur -X dontdiff linux-2.4.21-orig/drivers/char/Config.in linux-2.4.21/drivers/char/Config.in - --- linux-2.4.21-orig/drivers/char/Config.in 2003-06-22 15:45:58.000000000 +0000 +++ linux-2.4.21/drivers/char/Config.in 2003-06-22 08:50:04.000000000 +0000 @@ -179,6 +179,13 @@ 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 diff -Naur -X dontdiff linux-2.4.21-orig/drivers/char/pc_keyb.c linux-2.4.21/drivers/char/pc_keyb.c - --- linux-2.4.21-orig/drivers/char/pc_keyb.c 2002-11-28 23:53:12.000000000 +0000 +++ linux-2.4.21/drivers/char/pc_keyb.c 2003-06-22 15:39:21.000000000 +0000 @@ -13,6 +13,14 @@ * Code fixes to handle mouse ACKs properly. * C. Scott Ananian <cananian@alumni.princeton.edu> 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@onlinehome.de> 2003-04-30. + * + * Improvements to the "disable trackpad while typing" feature. + * Torsten Förtsch <torsten.foertsch@gmx.net> 2003-06-20. + * */ #include <linux/config.h> @@ -35,7 +43,7 @@ #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 +110,133 @@ #define MAX_RETRIES 60 /* some aux operations take long time*/ #endif /* CONFIG_PSMOUSE */ +#ifdef CONFIG_DISABLE_TRACKPAD_WHILE_TYPING + +static int trackpad_skipped_events = 0; +static int last_kbd_event = 0; /* timestamp of last kbd event */ +static int last_kbd_scancode = 0; +static int last_kbd_scancode_state = 0; +static int trackpad_disable = 0; +static int trackpad_delay = HZ; /* default delay is 1Sec */ + +static unsigned char trackpad_escape[0x200/8]; /* 2*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 %i", &tmp)) { + if ((tmp < 0) || (tmp >=0x200)) 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 %d\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 keydown */ + set_bit(0x2a, trackpad_escape); /* SHIFT-L keydown */ + set_bit(0x38, trackpad_escape); /* ALT-L keydown */ + + set_bit(0x61, trackpad_escape); /* CTRL-R keydown */ + set_bit(0x36, trackpad_escape); /* SHIFT-R keydown */ + set_bit(0x64, trackpad_escape); /* ALT-R keydown */ + + set_bit(0x7d, trackpad_escape); /* MS left WINDOWS keydown */ + set_bit(0x7e, trackpad_escape); /* MS right WINDOWS keydown */ + set_bit(0x7f, trackpad_escape); /* MS right MENU keydown */ +#if 0 + set_bit(0x01, trackpad_escape); /* ESC keydown */ + set_bit(0x66, trackpad_escape); /* HOME keydown */ + set_bit(0x67, trackpad_escape); /* CURSORUP keydown */ + set_bit(0x68, trackpad_escape); /* PAGEUP keydown */ + set_bit(0x69, trackpad_escape); /* CURSOR-L keydown */ + set_bit(0x6a, trackpad_escape); /* CURSOR-R keydown */ + set_bit(0x6b, trackpad_escape); /* END keydown */ + set_bit(0x6c, trackpad_escape); /* CURSORDOWN keydown */ + set_bit(0x6d, trackpad_escape); /* PAGEDOWN keydown */ +#endif + + return 0; +} + +#endif /* CONFIG_DISABLE_TRACKPAD_WHILE_TYPING */ + /* * Wait for keyboard controller input buffer to drain. * @@ -449,6 +584,24 @@ 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) { + trackpad_skipped_events++; + return; + } + } + + if (trackpad_skipped_events%12) { + trackpad_skipped_events++; + return; + } + trackpad_skipped_events=0; +#endif + prev_code = scancode; add_mouse_randomness(scancode); if (aux_count) { @@ -469,6 +622,45 @@ static inline void handle_keyboard_event(unsigned char scancode) { + +#ifdef CONFIG_DISABLE_TRACKPAD_WHILE_TYPING + /* this more or less resembles the pckbd_translate() algorithm */ + if( scancode==0xe0 && last_kbd_scancode_state==0 ) { /* escape 1b */ + last_kbd_scancode_state = 0x100; + } else if( scancode==0xe1 && last_kbd_scancode_state==0 ) { /* escape 2b */ + last_kbd_scancode_state = 0x200; + } else if(last_kbd_scancode_state==0x100) { + /* E0 table lookup */ + if( last_kbd_scancode = e0_keys[scancode&0x7f] ) { + if( scancode & 0x80 ) last_kbd_scancode|=0x100; + last_kbd_event = jiffies; + } + last_kbd_scancode_state=0; + } else if(last_kbd_scancode_state==0x200) { + if( (scancode&0x7f)==0x1d ) { + last_kbd_scancode_state++; + } else { + last_kbd_scancode_state=0; /* unknown e1 sequence */ + } + } else if(last_kbd_scancode_state==0x201) { + if( (scancode&0x7f)==0x45 ) { /* PAUSE key */ + last_kbd_scancode = E1_PAUSE; + if( scancode & 0x80 ) last_kbd_scancode|=0x100; + last_kbd_event = jiffies; + } + last_kbd_scancode_state=0; + } else { + last_kbd_scancode = (scancode&0x7f); + if( last_kbd_scancode >= SC_LIM ) + last_kbd_scancode=high_keys[last_kbd_scancode - SC_LIM]; + if( last_kbd_scancode ) { + if( scancode & 0x80 ) last_kbd_scancode|=0x100; + last_kbd_event = jiffies; + } + last_kbd_scancode_state=0; + } +#endif + #ifdef CONFIG_VT kbd_exists = 1; if (do_acknowledge(scancode)) @@ -1219,6 +1411,10 @@ 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; } -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE+9eHLwicyCTir8T4RAg+PAJ47B2aQZEbBz50mo5++GQlQCKs5BACgnjmI BIy+erf5vvQkEVRF5G89eB8= =OSyM -----END PGP SIGNATURE----- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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