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platform/x86: ideapad-laptop: Disable touchpad_switch for ELAN0634 

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
v3: Stupid missing ! in v2
v4: Correct acpi_dev_present usage (Hans)
Link: https://lore.kernel.org/r/20210107144438.12605-1-jiaxun.yang@flygoat.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Jiaxun Yang 2021-01-07 22:44:38 +08:00 committed by Hans de Goede
parent fc00bc8ac1
commit d69cd7eea9
1 changed files with 14 additions and 1 deletions
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15
drivers/platform/x86/ideapad-laptop.c
View File

@ -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("ELAN0634", NULL, -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);