| Message ID | 20240501140231.1.Ifa0e25ebf968d8f307f58d678036944141ab17e6@changeid |
|---|---|
| State | New |
| Headers | show |
| Series | Input: elantech - fix touchpad state on resume for Lenovo N24 | expand |
On Wed, May 01, 2024 at 02:02:32PM +0000, Jonathan Denose wrote: > 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> > --- > > drivers/input/mouse/elantech.c | 33 +++++++++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) > > diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c > index 4e38229404b4b..e0f3095b4227e 100644 > --- a/drivers/input/mouse/elantech.c > +++ b/drivers/input/mouse/elantech.c > @@ -1476,6 +1476,23 @@ 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 > */ > @@ -1486,6 +1503,22 @@ static int elantech_reconnect(struct psmouse *psmouse) > if (elantech_detect(psmouse, 0)) > return -1; > > + if (dmi_check_system(elantech_needs_reenable)) { > + int err; > + > + err = ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, NULL); This and below should be ps2_command(). > + > + if (err) > + psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n", > + psmouse->ps2dev.serio->phys, err); > + > + err = ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_ENABLE, NULL); > + > + 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"); > -- > 2.45.0.rc0.197.gbae5840b3b-goog > Thanks.
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 4e38229404b4b..e0f3095b4227e 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -1476,6 +1476,23 @@ 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 */ @@ -1486,6 +1503,22 @@ static int elantech_reconnect(struct psmouse *psmouse) if (elantech_detect(psmouse, 0)) return -1; + if (dmi_check_system(elantech_needs_reenable)) { + int err; + + err = ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, NULL); + + if (err) + psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n", + psmouse->ps2dev.serio->phys, err); + + err = ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_ENABLE, NULL); + + 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");
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> --- drivers/input/mouse/elantech.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)