touchpad state control, linux psmouse driver patch

Touchpad state control psmouse driver patch by rkraevskiy@gmail.com

to check touchpad state:
    cat /sys/bus/serio/drivers/psmouse/serio1/enabled
    1 -> touchpad is enabled
    0 -> touchpad is disabled

to disable touchpad:
    echo 0 >/sys/bus/serio/drivers/psmouse/serio1/enabled

to enable touchpad:
    echo 1 >/sys/bus/serio/drivers/psmouse/serio1/enabled


In /etc/acpi/handler.sh

    button/lid)
        STATE=`cat  /proc/acpi/button/lid/LID/state | cut -c13-`
        case "$STATE" in
            closed)
                echo 0 >/sys/bus/serio/drivers/psmouse/serio1/enabled
                ;;
            open)
                echo 1 >/sys/bus/serio/drivers/psmouse/serio1/enabled
                ;;
        esac
        ;;



diff -ur a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
--- a/drivers/input/mouse/psmouse-base.c    2012-12-11 05:30:57.000000000 +0200
+++ b/drivers/input/mouse/psmouse-base.c    2012-12-21 23:57:06.000000000 +0200
@@ -87,6 +87,9 @@
 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
            (void *) offsetof(struct psmouse, resync_time),
            psmouse_show_int_attr, psmouse_set_int_attr);
+PSMOUSE_DEFINE_ATTR(enabled, S_IWUSR | S_IRUGO,
+           NULL,
+           psmouse_attr_show_enabled, psmouse_attr_set_enabled);

 static struct attribute *psmouse_attributes[] = {
    &psmouse_attr_protocol.dattr.attr,
@@ -94,6 +97,7 @@
    &psmouse_attr_resolution.dattr.attr,
    &psmouse_attr_resetafter.dattr.attr,
    &psmouse_attr_resync_time.dattr.attr,
+   &psmouse_attr_enabled.dattr.attr,
    NULL
 };

@@ -1419,7 +1423,7 @@
    psmouse->resetafter = psmouse_resetafter;
    psmouse->resync_time = parent ? 0 : psmouse_resync_time;
    psmouse->smartscroll = psmouse_smartscroll;
-
+   psmouse->enabled = true;
    psmouse_switch_protocol(psmouse, NULL);

    psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
@@ -1602,7 +1606,7 @@
    retval = attr->set(psmouse, attr->data, buf, count);

    if (attr->protect) {
-       if (retval != -ENODEV)
+       if (retval != -ENODEV && psmouse->enabled)
            psmouse_activate(psmouse);

        if (parent)
@@ -1637,6 +1641,26 @@
    return count;
 }

+
+static ssize_t psmouse_attr_show_enabled(struct psmouse *psmouse, void *data, char *buf)
+{
+   return sprintf(buf, "%d\n", psmouse->enabled);
+}
+
+static ssize_t psmouse_attr_set_enabled(struct psmouse *psmouse, void *data, const char *buf, size_t count)
+{
+   unsigned int value;
+   int err;
+
+   err = kstrtouint(buf, 10, &value);
+   if (err){
+       return err;
+   }
+
+   psmouse->enabled = (value!=0);
+   return count;
+}
+
 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
 {
    return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
diff -ur a/drivers/input/mouse/psmouse.h b/drivers/input/mouse/psmouse.h
--- a/drivers/input/mouse/psmouse.h 2012-12-11 05:30:57.000000000 +0200
+++ b/drivers/input/mouse/psmouse.h 2012-12-21 23:53:54.000000000 +0200
@@ -62,6 +62,7 @@
    unsigned int resolution;
    unsigned int resetafter;
    unsigned int resync_time;
+   bool enabled;
    bool smartscroll;   /* Logitech only */

    psmouse_ret_t (*protocol_handler)(struct psmouse *psmouse);