From: José Expósito jose.exposito89@gmail.com

commit b201cb0ebe87b209e252d85668e517ac1929e250 upstream.

Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE reports.

Add an allow list and accept such reports only from devices in it.

Bug reported for Dell XPS 17 9710 on: https://gitlab.freedesktop.org/libinput/libinput/-/issues/662

Fixes: ac32bae00083 ("platform/x86: intel-hid: Add alternative method to enable switches") Depends-on: 153cca9caa81 ("platform/x86: Add and use a dual_accel_detect() helper") Reported-by: Tobias Gurtzick magic@wizardtales.com Suggested-by: Hans de Goede hdegoede@redhat.com Tested-by: Tobias Gurtzick magic@wizardtales.com Signed-off-by: José Expósito jose.exposito89@gmail.com Link: https://lore.kernel.org/r/20210920160312.9787-1-jose.exposito89@gmail.com [hdegoede@redhat.com: Check dmi_switches_auto_add_allow_list only once] Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/platform/x86/intel-hid.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel-hid.c b/drivers/platform/x86/intel-hid.c index 2e4e97a626a5..7b03b497d93b 100644 --- a/drivers/platform/x86/intel-hid.c +++ b/drivers/platform/x86/intel-hid.c @@ -118,12 +118,30 @@ static const struct dmi_system_id dmi_vgbs_allow_list[] = { { } };

+/* + * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE + * reports. Accept such reports only from devices in this list. + */ +static const struct dmi_system_id dmi_auto_add_switch[] = { + { + .matches = { + DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */), + }, + }, + { + .matches = { + DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */), + }, + }, + {} /* Array terminator */ +}; + struct intel_hid_priv { struct input_dev *input_dev; struct input_dev *array; struct input_dev *switches; bool wakeup_mode; - bool dual_accel; + bool auto_add_switch; };

#define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054" @@ -452,10 +470,8 @@ static void notify_handler(acpi_handle handle, u32 event, void *context) * Some convertible have unreliable VGBS return which could cause incorrect * SW_TABLET_MODE report, in these cases we enable support when receiving * the first event instead of during driver setup. - * - * See dual_accel_detect.h for more info on the dual_accel check. */ - if (!priv->switches && !priv->dual_accel && (event == 0xcc || event == 0xcd)) { + if (!priv->switches && priv->auto_add_switch && (event == 0xcc || event == 0xcd)) { dev_info(&device->dev, "switch event received, enable switches supports\n"); err = intel_hid_switches_setup(device); if (err) @@ -596,7 +612,8 @@ static int intel_hid_probe(struct platform_device *device) return -ENOMEM; dev_set_drvdata(&device->dev, priv);

- priv->dual_accel = dual_accel_detect(); + /* See dual_accel_detect.h for more info on the dual_accel check. */ + priv->auto_add_switch = dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect();

err = intel_hid_input_setup(device); if (err) {