On Wed, Dec 12, 2018 at 04:42:05PM +0100, Benjamin Tissoires wrote: > The current implementation of elan_i2c is known to not support those > 2 laptops. > > A proper fix is to tweak both elantech and elan_i2c to transmit the > correct information from PS/2, which would make a bad candidate for > stable. > > So to give us some time for fixing the root of the problem, disable > elan_i2c for the devices we know are not behaving properly. > > Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1803600 > Link: https://bugs.archlinux.org/task/59714 > Fixes: df077237cf55 Input: elantech - detect new ICs and setup Host Notify for them > > Cc: stable@xxxxxxxxxxxxxxx # v4.18+ > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> Acked-by: Peter Hutterer <peter.hutterer@xxxxxxxxx> Cheers, Peter > --- > drivers/input/mouse/elantech.c | 18 ++++++++++++++++-- > 1 file changed, 16 insertions(+), 2 deletions(-) > > diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c > index 2d95e8d93cc7..830ae9f07045 100644 > --- a/drivers/input/mouse/elantech.c > +++ b/drivers/input/mouse/elantech.c > @@ -1767,6 +1767,18 @@ static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ? > module_param_named(elantech_smbus, elantech_smbus, int, 0644); > MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device."); > > +static const char * const i2c_blacklist_pnp_ids[] = { > + /* > + * these are known to not be working properly as bits are missing > + * in elan_i2c > + */ > + "LEN2131", /* ThinkPad P52 w/ NFC */ > + "LEN2132", /* ThinkPad P52 */ > + "LEN2133", /* ThinkPad P72 w/ NFC */ > + "LEN2134", /* ThinkPad P72 */ > + NULL > +}; > + > static int elantech_create_smbus(struct psmouse *psmouse, > struct elantech_device_info *info, > bool leave_breadcrumbs) > @@ -1802,10 +1814,12 @@ static int elantech_setup_smbus(struct psmouse *psmouse, > > if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) { > /* > - * New ICs are enabled by default. > + * New ICs are enabled by default, unless mentioned in > + * i2c_blacklist_pnp_ids. > * Old ICs are up to the user to decide. > */ > - if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) > + if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) || > + psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids)) > return -ENXIO; > } > > -- > 2.19.2 >
