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platform/x86/lenovo: lenovo-ymc: Suppress probe on Yoga Book 9 14IAH10

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The Yoga Book 9 14IAH10 (DMI product name "83KJ") has a dedicated
yb9-kbdock WMI driver that registers an input device reporting
SW_TABLET_MODE to track the detachable Bluetooth keyboard.

lenovo-ymc also loads on this machine and creates an input node with the
SW_TABLET_MODE capability bit set.  For input switches, the presence of
the capability bit has semantic meaning: userspace (e.g. GNOME) reads
the switch state at startup from every node advertising the capability
and does not expect more than one such node.

Add a DMI match for the Yoga Book 9 14IAH10 to probe() so that
lenovo-ymc returns -ENODEV on this hardware, leaving yb9-kbdock as the
sole SW_TABLET_MODE source.  The ymc_ec_trigger EC write, the only
other action taken in response to a YMC event, is guarded by a separate
DMI table that excludes this machine; no other functionality is affected.

Signed-off-by: Dave Carey <carvsdriver@gmail.com>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Link: https://patch.msgid.link/20260728225545.1333610-2-carvsdriver@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Dave Carey 2026-07-28 18:55:43 -04:00 committed by Ilpo Järvinen
parent aca39607c1
commit bdd0f4e333
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GPG Key ID: 59AC4F6153E5CE31
1 changed files with 19 additions and 0 deletions
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19
drivers/platform/x86/lenovo/ymc.c
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@ -28,6 +28,22 @@ static bool force;
module_param(force, bool, 0444);
MODULE_PARM_DESC(force, "Force loading on boards without a convertible DMI chassis-type");
static const struct dmi_system_id lenovo_ymc_nosupport_dmi_table[] = {
{
/*
* Yoga Book 9 14IAH10: SW_TABLET_MODE is reported by the
* yb9-kbdock driver. Suppress lenovo-ymc on this machine to
* avoid userspace seeing two input nodes that both advertise
* the SW_TABLET_MODE capability.
*/
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "83KJ"),
},
},
{ }
};
static const struct dmi_system_id allowed_chasis_types_dmi_table[] = {
{
.matches = {
@ -107,6 +123,9 @@ static int lenovo_ymc_probe(struct wmi_device *wdev, const void *ctx)
struct input_dev *input_dev;
int err;
if (dmi_check_system(lenovo_ymc_nosupport_dmi_table))
return -ENODEV;
if (!dmi_check_system(allowed_chasis_types_dmi_table)) {
if (force)
dev_info(&wdev->dev, "Force loading Lenovo YMC support\n");