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Input: elantech - disable elan-i2c for P52 and P72

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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>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Benjamin Tissoires 2018-12-21 00:42:38 -08:00 committed by Dmitry Torokhov
parent ca5047286c
commit d21ff5d7f8
1 changed files with 16 additions and 2 deletions
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18
drivers/input/mouse/elantech.c
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@ -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;
}