Input: hgpk - forced recalibration for the OLPC touchpad
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. We can not use the reconnect capability which is already available in /sys because full reset of the touchpad takes 1.1 - 1.2 secons which is too long. 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. Signed-off-by: Paul Fox <pgf@laptop.org> Acked-by: Andres Salomon <dilinger@collabora.co.uk> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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1 changed files with 52 additions and 3 deletions
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@ -369,12 +369,46 @@ static ssize_t hgpk_set_powered(struct psmouse *psmouse, void *data,
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__PSMOUSE_DEFINE_ATTR(powered, S_IWUSR | S_IRUGO, NULL,
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hgpk_show_powered, hgpk_set_powered, 0);
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static ssize_t hgpk_trigger_recal_show(struct psmouse *psmouse,
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void *data, char *buf)
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{
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return -EINVAL;
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}
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static ssize_t hgpk_trigger_recal(struct psmouse *psmouse, void *data,
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const char *buf, size_t count)
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{
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struct hgpk_data *priv = psmouse->private;
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unsigned long value;
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int err;
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err = strict_strtoul(buf, 10, &value);
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if (err || value != 1)
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return -EINVAL;
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/*
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* We queue work instead of doing recalibration right here
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* to avoid adding locking to to hgpk_force_recalibrate()
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* since workqueue provides serialization.
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*/
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psmouse_queue_work(psmouse, &priv->recalib_wq, 0);
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return count;
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}
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__PSMOUSE_DEFINE_ATTR(recalibrate, S_IWUSR | S_IRUGO, NULL,
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hgpk_trigger_recal_show, hgpk_trigger_recal, 0);
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static void hgpk_disconnect(struct psmouse *psmouse)
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{
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struct hgpk_data *priv = psmouse->private;
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device_remove_file(&psmouse->ps2dev.serio->dev,
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&psmouse_attr_powered.dattr);
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if (psmouse->model >= HGPK_MODEL_C)
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device_remove_file(&psmouse->ps2dev.serio->dev,
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&psmouse_attr_recalibrate.dattr);
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psmouse_reset(psmouse);
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kfree(priv);
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}
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@ -423,10 +457,25 @@ static int hgpk_register(struct psmouse *psmouse)
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err = device_create_file(&psmouse->ps2dev.serio->dev,
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&psmouse_attr_powered.dattr);
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if (err)
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hgpk_err(psmouse, "Failed to create sysfs attribute\n");
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if (err) {
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hgpk_err(psmouse, "Failed creating 'powered' sysfs node\n");
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return err;
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}
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/* C-series touchpads added the recalibrate command */
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if (psmouse->model >= HGPK_MODEL_C) {
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err = device_create_file(&psmouse->ps2dev.serio->dev,
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&psmouse_attr_recalibrate.dattr);
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if (err) {
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hgpk_err(psmouse,
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"Failed creating 'recalibrate' sysfs node\n");
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device_remove_file(&psmouse->ps2dev.serio->dev,
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&psmouse_attr_powered.dattr);
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return err;
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}
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}
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return 0;
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}
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int hgpk_init(struct psmouse *psmouse)
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