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ACPI does not describe a controllable vbat supply or provide a _DSD function mapping for the enable GPIO, so the existing driver cannot initialize the devices reliably. Make the vbat regulator optional while preserving the existing behavior when a supply is described, then map the first ACPI GPIO resource as the enable line before requesting it. Tested on a Lenovo Yoga Book YB1-X91L with both controllers probing and direct per-device force-feedback playback. A separately posted platform/x86 series supplies the device mode and waveform properties. Maurizio Casciano (2): Input: drv260x: Make vbat supply optional Input: drv260x: Map ACPI enable GPIO drivers/input/misc/drv260x.c | 72 ++++++++++++++++++++++++------------ 1 file changed, 48 insertions(+), 24 deletions(-) base-commit: 9a29ee801f525bcad71fea021bfe2a030885c8df -- 2.53.0