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    Subject[PATCH 5.6 079/161] ACPI: GED: add support for _Exx / _Lxx handler methods
    Date
    From: Ard Biesheuvel <ardb@kernel.org>

    commit ea6f3af4c5e63f6981c0b0ab8ebec438e2d5ef40 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/acpi/evged.c | 22 +++++++++++++++++++---
    1 file changed, 19 insertions(+), 3 deletions(-)

    --- a/drivers/acpi/evged.c
    +++ b/drivers/acpi/evged.c
    @@ -79,6 +79,8 @@ static acpi_status acpi_ged_request_inte
    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_inte
    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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