Commit ea6f3af4 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Rafael J. Wysocki
Browse files

ACPI: GED: add support for _Exx / _Lxx handler methods 



Per the ACPI spec, interrupts in the range [0, 255] may be handled
in AML using individual methods whose naming is based on the format
_Exx or _Lxx, where xx is the hex representation of the interrupt
index.

Add support for this missing feature to our ACPI GED driver.

Cc: v4.9+ <stable@vger.kernel.org> # v4.9+
Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent a10660f7

drivers/acpi/evged.c

+19 −3
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares, 
	struct resource r;

	struct acpi_resource_irq *p = &ares->data.irq;

	struct acpi_resource_extended_irq *pext = &ares->data.extended_irq;

	char ev_name[5];

	u8 trigger;



	if (ares->type == ACPI_RESOURCE_TYPE_END_TAG)

		return AE_OK;
@@ -87,14 +89,28 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares, 
		dev_err(dev, "unable to parse IRQ resource\n");

		return AE_ERROR;

	}

	if (ares->type == ACPI_RESOURCE_TYPE_IRQ)

	if (ares->type == ACPI_RESOURCE_TYPE_IRQ) {

		gsi = p->interrupts[0];

	else

		trigger = p->triggering;

	} else {

		gsi = pext->interrupts[0];

		trigger = p->triggering;

	}



	irq = r.start;



	if (ACPI_FAILURE(acpi_get_handle(handle, "_EVT", &evt_handle))) {

	switch (gsi) {

	case 0 ... 255:

		sprintf(ev_name, "_%c%02hhX",

			trigger == ACPI_EDGE_SENSITIVE ? 'E' : 'L', gsi);



		if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))

			break;

		/* fall through */

	default:

		if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))

			break;



		dev_err(dev, "cannot locate _EVT method\n");

		return AE_ERROR;

	}

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