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https://github.com/opnsense/src.git
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1db6ffb2a4
Changes to acpi_gpiobus.c handle discovering and parsing the _AEI
objects and storing necessary data in device ivars. A new gpioaei.c
file implements the device, which simply requests an interrupt when
the pin is triggered and invokes the appropriate _Exx or _Lxx ACPI
method.
This makes the GPIO "power button" work on arm64 Graviton systems,
allowing EC2 "Stop"/"Reboot" instance calls to be handled cleanly.
(Prior to this change, those requests would time out after 4 minutes
and the instance would be forcibly killed.)
Reviewed by: imp, andrew, Ahmad Khalifa
Approved by: re (kib)
MFC after: 3 days
Sponsored by: Amazon
Differential Revision: https://reviews.freebsd.org/D47253
Co-authored-by: Andrew Turner <andrew@FreeBSD.org>
(cherry picked from commit 9709bda03cd0f20eba0ba4276fc3c2e06354a54f)
(cherry picked from commit c2cd78d944)
131 lines
4 KiB
C
131 lines
4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2024 Colin Percival
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include "gpiobus_if.h"
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#include <contrib/dev/acpica/include/acpi.h>
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#include <dev/acpica/acpivar.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/gpio/acpi_gpiobusvar.h>
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struct gpio_aei_softc {
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ACPI_HANDLE handle;
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char objname[5]; /* "_EXX" or "_LXX" */
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struct resource * intr_res;
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int intr_rid;
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void * intr_cookie;
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};
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static int
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gpio_aei_probe(device_t dev)
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{
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/* We only match when gpiobus explicitly requested gpio_aei. */
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return (BUS_PROBE_NOWILDCARD);
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}
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static void
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gpio_aei_intr(void * arg)
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{
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struct gpio_aei_softc * sc = arg;
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/* Ask ACPI to run the appropriate _Exx or _Lxx method. */
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AcpiEvaluateObject(sc->handle, sc->objname, NULL, NULL);
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}
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static int
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gpio_aei_attach(device_t dev)
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{
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struct gpio_aei_softc * sc = device_get_softc(dev);
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gpio_pin_t pin;
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int err;
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/* This is us. */
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device_set_desc(dev, "ACPI Event Information Device");
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/* Store parameters needed by gpio_aei_intr. */
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sc->handle = acpi_gpiobus_get_handle(dev);
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if (gpio_pin_get_by_acpi_index(dev, 0, &pin) != 0) {
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device_printf(dev, "Unable to get the input pin\n");
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return (ENXIO);
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}
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sprintf(sc->objname, "_%c%02X",
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(pin->flags & GPIO_INTR_EDGE_MASK) ? 'E' : 'L', pin->pin);
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/* Support for GPIO pins > 255 is not implemented. */
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if (pin->pin > 255) {
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device_printf(dev, "ACPI Event Information Device does not support pins > 255");
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return (ENOTSUP);
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}
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/* Set up the interrupt. */
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if ((sc->intr_res = gpio_alloc_intr_resource(dev, &sc->intr_rid,
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RF_ACTIVE, pin, pin->flags & GPIO_INTR_MASK)) == NULL) {
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device_printf(dev, "Cannot allocate an IRQ\n");
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return (ENOTSUP);
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}
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err = bus_setup_intr(dev, sc->intr_res, INTR_TYPE_MISC | INTR_MPSAFE,
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NULL, gpio_aei_intr, sc, &sc->intr_cookie);
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if (err != 0) {
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device_printf(dev, "Cannot set up IRQ\n");
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bus_release_resource(dev, SYS_RES_IRQ, sc->intr_rid,
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sc->intr_res);
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return (err);
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}
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return (0);
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}
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static int
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gpio_aei_detach(device_t dev)
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{
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struct gpio_aei_softc * sc = device_get_softc(dev);
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bus_teardown_intr(dev, sc->intr_res, sc->intr_cookie);
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bus_release_resource(dev, SYS_RES_IRQ, sc->intr_rid, sc->intr_res);
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return (0);
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}
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static device_method_t gpio_aei_methods[] = {
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/* Device interface. */
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DEVMETHOD(device_probe, gpio_aei_probe),
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DEVMETHOD(device_attach, gpio_aei_attach),
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DEVMETHOD(device_detach, gpio_aei_detach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_0(gpio_aei, gpio_aei_driver, gpio_aei_methods, sizeof(struct gpio_aei_softc));
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DRIVER_MODULE(gpio_aei, gpiobus, gpio_aei_driver, NULL, NULL);
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MODULE_DEPEND(gpio_aei, acpi_gpiobus, 1, 1, 1);
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