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Input: elantech - reset touchpad before configuring it

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Acer VH40 has a Fn key toggling the touchpad on and off, but it's
implemented in system firmware, and the EC chip has to receive
reset command to activate this function. Also when this machine
wakes up after resume, psmouse_reset is necessary to bring the
touchpad back on.

Signed-off-by: JJ Ding <jj_ding@emc.com.tw>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
JJ Ding 2012-04-10 00:29:12 -07:00 committed by Dmitry Torokhov
parent d626dad58f
commit a67ada7a72
1 changed files with 4 additions and 0 deletions
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4
drivers/input/mouse/elantech.c
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@ -1245,6 +1245,8 @@ static void elantech_disconnect(struct psmouse *psmouse)
*/ */
static int elantech_reconnect(struct psmouse *psmouse) static int elantech_reconnect(struct psmouse *psmouse)
{ {
psmouse_reset(psmouse);
if (elantech_detect(psmouse, 0)) if (elantech_detect(psmouse, 0))
return -1; return -1;
@ -1324,6 +1326,8 @@ int elantech_init(struct psmouse *psmouse)
if (!etd) if (!etd)
return -ENOMEM; return -ENOMEM;
psmouse_reset(psmouse);
etd->parity[0] = 1; etd->parity[0] = 1;
for (i = 1; i < 256; i++) for (i = 1; i < 256; i++)
etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;