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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: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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1 changed files with 19 additions and 3 deletions
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@ -79,6 +79,8 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
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struct resource r;
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struct acpi_resource_irq *p = &ares->data.irq;
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struct acpi_resource_extended_irq *pext = &ares->data.extended_irq;
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char ev_name[5];
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u8 trigger;
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if (ares->type == ACPI_RESOURCE_TYPE_END_TAG)
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return AE_OK;
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@ -87,14 +89,28 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
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dev_err(dev, "unable to parse IRQ resource\n");
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return AE_ERROR;
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}
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if (ares->type == ACPI_RESOURCE_TYPE_IRQ)
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if (ares->type == ACPI_RESOURCE_TYPE_IRQ) {
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gsi = p->interrupts[0];
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else
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trigger = p->triggering;
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} else {
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gsi = pext->interrupts[0];
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trigger = p->triggering;
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}
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irq = r.start;
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if (ACPI_FAILURE(acpi_get_handle(handle, "_EVT", &evt_handle))) {
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switch (gsi) {
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case 0 ... 255:
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sprintf(ev_name, "_%c%02hhX",
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trigger == ACPI_EDGE_SENSITIVE ? 'E' : 'L', gsi);
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if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
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break;
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/* fall through */
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default:
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
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break;
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dev_err(dev, "cannot locate _EVT method\n");
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return AE_ERROR;
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}
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