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HID: asus: only support backlight when it's not driven by WMI

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The Asus GL502VSK has the same 0B05:1837 keyboard as we've seen in
several Republic of Gamers laptops.

However, in this model, the keybard backlight control exposed by hid-asus
has no effect on the keyboard backlight. Instead, the keyboard
backlight is correctly driven by asus-wmi.

With two keyboard backlight devices available (and only the acer-wmi
one working), GNOME is picking the wrong one to drive in the UI.

Avoid this problem by not creating the backlight interface when we
detect a WMI-driven keyboard backlight.

We have also tested Asus GL702VMK which does have the hid-asus
backlight present, and it still works fine with this patch (WMI method
call returns UNSUPPORTED_METHOD).

A direct "depends on ASUS_WMI" is intentionally avoided so that HID_ASUS
users who have ASUS_WMI=n will not quietly lose their HID_ASUS driver on
a kernel upgrade.

Signed-off-by: Daniel Drake <drake@endlessm.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Daniel Drake 2018-10-09 14:40:56 +08:00 committed by Andy Shevchenko
parent ffb6ce7086
commit 3b692c55e5
2 changed files with 23 additions and 1 deletions
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1
drivers/hid/Kconfig
View File

@ -149,6 +149,7 @@ config HID_APPLEIR
config HID_ASUS
tristate "Asus"
depends on LEDS_CLASS
depends on ASUS_WMI || ASUS_WMI=n
---help---
Support for Asus notebook built-in keyboard and touchpad via i2c, and
the Asus Republic of Gamers laptop keyboard special keys.

23
drivers/hid/hid-asus.c
View File

@ -29,6 +29,7 @@
#include <linux/dmi.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/platform_data/x86/asus-wmi.h>
#include <linux/input/mt.h>
#include <linux/usb.h> /* For to_usb_interface for T100 touchpad intf check */
@ -349,6 +350,24 @@ static void asus_kbd_backlight_work(struct work_struct *work)
hid_err(led->hdev, "Asus failed to set keyboard backlight: %d\n", ret);
}
/* WMI-based keyboard backlight LED control (via asus-wmi driver) takes
* precedence. We only activate HID-based backlight control when the
* WMI control is not available.
*/
static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
{
u32 value;
int ret;
ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS2,
ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);
hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);
if (ret)
return false;
return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT);
}
static int asus_kbd_register_leds(struct hid_device *hdev)
{
struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
@ -436,7 +455,9 @@ static int asus_input_configured(struct hid_device *hdev, struct hid_input *hi)
drvdata->input = input;
if (drvdata->enable_backlight && asus_kbd_register_leds(hdev))
if (drvdata->enable_backlight &&
!asus_kbd_wmi_led_control_present(hdev) &&
asus_kbd_register_leds(hdev))
hid_warn(hdev, "Failed to initialize backlight.\n");
return 0;