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Subject[PATCH] forced recalibration for the OLPC hgpk touchpad
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The OLPC XO laptop incorporates a combination touchpad/tablet
device which unfortunately requires frequent recalibration. The
driver will force this automatically when various suspicious
behaviors are observed, and the user can recalibrate manually
(with a special keyboard sequence). There's currently no way,
however, for an external program to cause recalibration.

This patch creates a new node in /sys which, when written with '1',
will force a touchpad recalibration. No other writes (or reads)
of this node are supported.

paul

--------------------

Signed-off-by: Paul Fox <pgf@foxharp.boston.ma.us>

diff --git a/drivers/input/mouse/hgpk.c b/drivers/input/mouse/hgpk.c
index a1ad2f1..e736ebd 100644
--- a/drivers/input/mouse/hgpk.c
+++ b/drivers/input/mouse/hgpk.c
@@ -369,12 +369,40 @@ static ssize_t hgpk_set_powered(struct psmouse *psmouse, void *data,
__PSMOUSE_DEFINE_ATTR(powered, S_IWUSR | S_IRUGO, NULL,
hgpk_show_powered, hgpk_set_powered, 0);

+static ssize_t hgpk_trigger_recal_show(struct psmouse *psmouse,
+ void *data, char *buf)
+{
+ return -EINVAL;
+}
+
+static ssize_t hgpk_trigger_recal(struct psmouse *psmouse, void *data,
+ const char *buf, size_t count)
+{
+ struct hgpk_data *priv = psmouse->private;
+ unsigned long value;
+ int err;
+
+ err = strict_strtoul(buf, 10, &value);
+ if (err || value != 1)
+ return -EINVAL;
+
+ psmouse_queue_work(psmouse, &priv->recalib_wq,
+ msecs_to_jiffies(1));
+
+ return count;
+}
+
+__PSMOUSE_DEFINE_ATTR(recalibrate, S_IWUSR | S_IRUGO, NULL,
+ hgpk_trigger_recal_show, hgpk_trigger_recal, 0);
+
static void hgpk_disconnect(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;

device_remove_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_powered.dattr);
+ device_remove_file(&psmouse->ps2dev.serio->dev,
+ &psmouse_attr_recalibrate.dattr);
psmouse_reset(psmouse);
kfree(priv);
}
@@ -423,8 +451,18 @@ static int hgpk_register(struct psmouse *psmouse)

err = device_create_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_powered.dattr);
- if (err)
- hgpk_err(psmouse, "Failed to create sysfs attribute\n");
+ if (err) {
+ hgpk_err(psmouse, "Failed creating 'powered' sysfs node\n");
+ } else {
+ err = device_create_file(&psmouse->ps2dev.serio->dev,
+ &psmouse_attr_recalibrate.dattr);
+ if (err) {
+ hgpk_err(psmouse,
+ "Failed creating 'recalibrate' sysfs node\n");
+ device_remove_file(&psmouse->ps2dev.serio->dev,
+ &psmouse_attr_powered.dattr);
+ }
+ }

return err;
}


=---------------------
paul fox, pgf@laptop.org

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