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Input: soc_button_array: defer MSHW0040 probe until GPIO is ready by zR-JB · Pull Request #172 · linux-surface/kernel · GitHub

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Input: soc_button_array: defer MSHW0040 probe until GPIO is ready #172

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Input: soc_button_array: defer MSHW0040 probe until GPIO is ready #172

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16 changes: 15 additions & 1 deletion drivers/input/misc/soc_button_array.c
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Original file line number Diff line number Diff line change
Expand Up @@ -553,13 +553,27 @@ static int soc_device_check_MSHW0040(struct device *dev)
{
acpi_handle handle = ACPI_HANDLE(dev);
bool exists;
int gpio, irq, error;

// check if OEM platform revision DSM call exists
exists = acpi_check_dsm(handle, &MSHW0040_DSM_UUID,
MSHW0040_DSM_REVISION,
BIT(MSHW0040_DSM_GET_OMPR));
if (!exists)
return -ENODEV;

return exists ? 0 : -ENODEV;
/*
* Explicitly check if the GPIO controller is ready. The generic
* button creation path deliberately ignores -EPROBE_DEFER because
* some Intel platforms expose virtual GPIO resources which never
* acquire a GPIO provider. MSHW0040, however, is expected to have
* a real power-button GPIO at index 0.
*/
error = soc_button_lookup_gpio(dev, 0, &gpio, &irq);
if (error == -EPROBE_DEFER)
return error;

return 0;
}

/*
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