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Input: elantech - fix touchpad state on resume for Lenovo N24

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[ Upstream commit a69ce592cbe0417664bc5a075205aa75c2ec1273 ]

The Lenovo N24 on resume becomes stuck in a state where it
sends incorrect packets, causing elantech_packet_check_v4 to fail.
The only way for the device to resume sending the correct packets is for
it to be disabled and then re-enabled.

This change adds a dmi check to trigger this behavior on resume.

Signed-off-by: Jonathan Denose <jdenose@google.com>
Link: https://lore.kernel.org/r/20240503155020.v2.1.Ifa0e25ebf968d8f307f58d678036944141ab17e6@changeid
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Denose 2024-05-03 16:12:07 +00:00 committed by Greg Kroah-Hartman
parent cf704e7d04
commit 9b32a13486
1 changed files with 31 additions and 0 deletions
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31
drivers/input/mouse/elantech.c
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@ -1476,16 +1476,47 @@ static void elantech_disconnect(struct psmouse *psmouse)
psmouse->private = NULL;
}
/*
* Some hw_version 4 models fail to properly activate absolute mode on
* resume without going through disable/enable cycle.
*/
static const struct dmi_system_id elantech_needs_reenable[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
{
/* Lenovo N24 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "81AF"),
},
},
#endif
{ }
};
/*
* Put the touchpad back into absolute mode when reconnecting
*/
static int elantech_reconnect(struct psmouse *psmouse)
{
int err;
psmouse_reset(psmouse);
if (elantech_detect(psmouse, 0))
return -1;
if (dmi_check_system(elantech_needs_reenable)) {
err = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
if (err)
psmouse_warn(psmouse, "failed to deactivate mouse on %s: %d\n",
psmouse->ps2dev.serio->phys, err);
err = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
if (err)
psmouse_warn(psmouse, "failed to reactivate mouse on %s: %d\n",
psmouse->ps2dev.serio->phys, err);
}
if (elantech_set_absolute_mode(psmouse)) {
psmouse_err(psmouse,
"failed to put touchpad back into absolute mode.\n");