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| author | Hans de Goede <hdegoede@redhat.com> | 2020-05-02 20:29:49 +0200 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-05-07 20:19:37 +0300 |
| commit | 990fbb48067bf8cfa34b7d1e6e1674eaaef2f450 (patch) | |
| tree | 98499fcc88ab0e2c99e8e9f405b791b5c4623be3 /drivers/platform | |
| parent | f6ba524970c4b73b234bf41ecd6628f5803b1559 (diff) | |
| download | linux-990fbb48067bf8cfa34b7d1e6e1674eaaef2f450.tar.bz2 | |
platform/x86: intel-vbtn: Do not advertise switches to userspace if they are not there
Commit de9647efeaa9 ("platform/x86: intel-vbtn: Only activate tablet mode
switch on 2-in-1's") added a DMI chassis-type check to avoid accidentally
reporting SW_TABLET_MODE = 1 to userspace on laptops (specifically on the
Dell XPS 9360), to avoid e.g. userspace ignoring touchpad events because
userspace thought the device was in tablet-mode.
But if we are not getting the initial status of the switch because the
device does not have a tablet mode, then we really should not advertise
the presence of a tablet-mode switch to userspace at all, as userspace may
use the mere presence of this switch for certain heuristics.
Fixes: de9647efeaa9 ("platform/x86: intel-vbtn: Only activate tablet mode switch on 2-in-1's")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/intel-vbtn.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-vbtn.c index 634096cef21a..500fae82e12c 100644 --- a/drivers/platform/x86/intel-vbtn.c +++ b/drivers/platform/x86/intel-vbtn.c @@ -55,6 +55,7 @@ static const struct key_entry intel_vbtn_switchmap[] = { struct intel_vbtn_priv { struct key_entry keymap[KEYMAP_LEN]; struct input_dev *input_dev; + bool has_switches; bool wakeup_mode; }; @@ -70,7 +71,7 @@ static int intel_vbtn_input_setup(struct platform_device *device) keymap_len += ARRAY_SIZE(intel_vbtn_keymap); } - if (true) { + if (priv->has_switches) { memcpy(&priv->keymap[keymap_len], intel_vbtn_switchmap, ARRAY_SIZE(intel_vbtn_switchmap) * sizeof(struct key_entry)); @@ -138,16 +139,12 @@ out_unknown: static void detect_tablet_mode(struct platform_device *device) { - const char *chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); acpi_handle handle = ACPI_HANDLE(&device->dev); unsigned long long vgbs; acpi_status status; int m; - if (!(chassis_type && strcmp(chassis_type, "31") == 0)) - return; - status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs); if (ACPI_FAILURE(status)) return; @@ -158,6 +155,19 @@ static void detect_tablet_mode(struct platform_device *device) input_report_switch(priv->input_dev, SW_DOCK, m); } +static bool intel_vbtn_has_switches(acpi_handle handle) +{ + const char *chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); + unsigned long long vgbs; + acpi_status status; + + if (!(chassis_type && strcmp(chassis_type, "31") == 0)) + return false; + + status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs); + return ACPI_SUCCESS(status); +} + static int intel_vbtn_probe(struct platform_device *device) { acpi_handle handle = ACPI_HANDLE(&device->dev); @@ -176,13 +186,16 @@ static int intel_vbtn_probe(struct platform_device *device) return -ENOMEM; dev_set_drvdata(&device->dev, priv); + priv->has_switches = intel_vbtn_has_switches(handle); + err = intel_vbtn_input_setup(device); if (err) { pr_err("Failed to setup Intel Virtual Button\n"); return err; } - detect_tablet_mode(device); + if (priv->has_switches) + detect_tablet_mode(device); status = acpi_install_notify_handler(handle, ACPI_DEVICE_NOTIFY, |