Newer ideapads (e.g.: Yoga 14s, 720S 14) come with ELAN0634 touchpad do not use EC to switch touchpad.

Reading VPCCMD_R_TOUCHPAD will return zero thus touchpad may be blocked unexpectedly. Writing VPCCMD_W_TOUCHPAD may cause a spurious key press.

Add has_touchpad_switch to workaround these machines.

Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com Cc: stable@vger.kernel.org # 5.4+ -- v2: Specify touchpad to ELAN0634 --- drivers/platform/x86/ideapad-laptop.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c index 7598cd46cf60..3bd29eb956d2 100644 --- a/drivers/platform/x86/ideapad-laptop.c +++ b/drivers/platform/x86/ideapad-laptop.c @@ -92,6 +92,7 @@ struct ideapad_private { struct dentry *debug; unsigned long cfg; bool has_hw_rfkill_switch; + bool has_touchpad_switch; const char *fnesc_guid; };

@@ -535,7 +536,9 @@ static umode_t ideapad_is_visible(struct kobject *kobj, } else if (attr == &dev_attr_fn_lock.attr) { supported = acpi_has_method(priv->adev->handle, "HALS") && acpi_has_method(priv->adev->handle, "SALS"); - } else + } else if (attr == &dev_attr_touchpad.attr) + supported = priv->has_touchpad_switch; + else supported = true;

return supported ? attr->mode : 0; @@ -867,6 +870,9 @@ static void ideapad_sync_touchpad_state(struct ideapad_private *priv) { unsigned long value;

+ if (!priv->has_touchpad_switch) + return; + /* Without reading from EC touchpad LED doesn't switch state */ if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) { /* Some IdeaPads don't really turn off touchpad - they only @@ -989,6 +995,9 @@ static int ideapad_acpi_add(struct platform_device *pdev) priv->platform_device = pdev; priv->has_hw_rfkill_switch = dmi_check_system(hw_rfkill_list);

+ /* Most ideapads with ELAN0634 touchpad don't use EC touchpad switch */ + priv->has_touchpad_switch = acpi_dev_present("PNP0C50", "ELAN0634", -1); + ret = ideapad_sysfs_init(priv); if (ret) return ret; @@ -1006,6 +1015,10 @@ static int ideapad_acpi_add(struct platform_device *pdev) if (!priv->has_hw_rfkill_switch) write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1);

+ /* The same for Touchpad */ + if (!priv->has_touchpad_switch) + write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, 1); + for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg)) ideapad_register_rfkill(priv, i);