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authorMichał Kępień <kernel@kempniu.pl>2016-06-28 09:25:50 +0200
committerDarren Hart <dvhart@linux.intel.com>2016-06-28 22:18:34 -0700
commit1879e69f4c57ead5ff696eb309a0422d01c1cc06 (patch)
tree2954284c8bbe29f4ccf8e900c21fa554b10ba6d7 /drivers/platform
parent00816e1b3839c8e95d0e2e1b0290c1bc5e950bc6 (diff)
downloadlinux-1879e69f4c57ead5ff696eb309a0422d01c1cc06.tar.bz2
fujitsu-laptop: Support touchpad toggle hotkey on Skylake-based models
Haswell-based Fujitsu laptops (Lifebook E734/E744/E754) have a touchpad toggle hotkey (Fn+F4) which is handled transparently to the operating system: while an ACPI notification is sent to FUJ02B1 when Fn+F4 is pressed, touchpad state is properly toggled without any explicit support for this operation in fujitsu-laptop. Skylake-based models (Lifebook E736/E746/E756) also have that hotkey, but the touchpad is not toggled transparently to the operating system. When Fn+F4 is pressed, an ACPI notification is sent to FUJ02E3. A subsequent call to S000 (FUNC_RFKILL) can be used to determine whether the touchpad toggle hotkey was pressed so that an input event can be sent to userspace. Relevant ACPI code: Method (_L21, 0, NotSerialized) { ... If (AHKF) { Notify (\_SB.FEXT, 0x80) } ... } Method (S000, 3, Serialized) { Name (_T_0, Zero) Local0 = Zero While (One) { _T_0 = Arg0 If (_T_0 == Zero) { Local0 |= 0x04000000 Local0 |= 0x02000000 Local0 |= 0x00020000 Local0 |= 0x0200 Local0 |= 0x0100 Local0 |= 0x20 } ElseIf (_T_0 == One) { ... If (AHKF & 0x08) { Local0 |= 0x04000000 AHKF ^= 0x08 } ... } ... Break } Return (Local0) } Pressing Fn+F4 raises GPE 0x21 and sets bit 3 in AHKF. This in turn results in bit 26 being set in the value returned by FUNC_RFKILL called with 1 as its first argument. On Skylake-based models, bit 26 is also set in the value returned by FUNC_RFKILL called with 0 as its first argument (this value is saved in fujitsu_hotkey->rfkill_supported upon module initialization), which suggests that this bit is set on models which do not handle touchpad toggling transparently to the operating system. Note that bit 3 is cleared in AHKF once FUNC_RFKILL is called with 1 as its first argument, which requires fujitsu-laptop to handle this hotkey in a different manner than the other, GIRB-based hotkeys: two input events (press and release) are immediately sent once Fn+F4 is pressed. Reported-and-tested-by: Jan-Marek Glogowski <glogow@fbihome.de> Signed-off-by: Michał Kępień <kernel@kempniu.pl> Acked-by: Jonathan Woithe <jwoithe@just42.net> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/fujitsu-laptop.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 7a345f92da52..5144c353fa14 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -846,6 +846,7 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
set_bit(fujitsu->keycode3, input->keybit);
set_bit(fujitsu->keycode4, input->keybit);
set_bit(fujitsu->keycode5, input->keybit);
+ set_bit(KEY_TOUCHPAD_TOGGLE, input->keybit);
set_bit(KEY_UNKNOWN, input->keybit);
error = input_register_device(input);
@@ -1050,6 +1051,19 @@ static void acpi_fujitsu_hotkey_notify(struct acpi_device *device, u32 event)
}
}
+ /* On some models (first seen on the Skylake-based Lifebook
+ * E736/E746/E756), the touchpad toggle hotkey (Fn+F4) is
+ * handled in software; its state is queried using FUNC_RFKILL
+ */
+ if ((fujitsu_hotkey->rfkill_supported & BIT(26)) &&
+ (call_fext_func(FUNC_RFKILL, 0x1, 0x0, 0x0) & BIT(26))) {
+ keycode = KEY_TOUCHPAD_TOGGLE;
+ input_report_key(input, keycode, 1);
+ input_sync(input);
+ input_report_key(input, keycode, 0);
+ input_sync(input);
+ }
+
break;
default:
keycode = KEY_UNKNOWN;