On Tue, Dec 18, 2018 at 06:13:43PM +1000, Peter Hutterer wrote:

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@vger.kernel.org # v4.18+ Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

Acked-by: Peter Hutterer peter.hutterer@who-t.net

Applied, thank you.

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