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gpioaei: Add support for ACPI _EVT method

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This method is often used to process GPIO "Power on" button press on
modern x86 laptops with S0ix sleep mode.

Tested with patch from https://reviews.freebsd.org/D26407

Sponsored by:	Future Crew LLC
MFC after:	2 month

(cherry picked from commit adc2c156acb50bac6e8ec66b72cadc8910ce4975)
This commit is contained in:
Vladimir Kondratyev 2025-03-07 18:59:12 +03:00
parent f05f6d9373
commit e7d1f208fd
1 changed files with 31 additions and 9 deletions
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40
sys/dev/gpio/gpioaei.c
View file

@ -39,9 +39,16 @@
#include <dev/gpio/gpiobusvar.h>
#include <dev/gpio/acpi_gpiobusvar.h>
enum gpio_aei_type {
ACPI_AEI_TYPE_UNKNOWN,
ACPI_AEI_TYPE_ELX,
ACPI_AEI_TYPE_EVT
};
struct gpio_aei_softc {
ACPI_HANDLE handle;
char objname[5]; /* "_EXX" or "_LXX" */
enum gpio_aei_type type;
int pin;
struct resource * intr_res;
int intr_rid;
void * intr_cookie;
@ -60,8 +67,11 @@ gpio_aei_intr(void * arg)
{
struct gpio_aei_softc * sc = arg;
/* Ask ACPI to run the appropriate _Exx or _Lxx method. */
AcpiEvaluateObject(sc->handle, sc->objname, NULL, NULL);
/* Ask ACPI to run the appropriate _EVT, _Exx or _Lxx method. */
if (sc->type == ACPI_AEI_TYPE_EVT)
acpi_SetInteger(sc->handle, NULL, sc->pin);
else
AcpiEvaluateObject(sc->handle, NULL, NULL, NULL);
}
static int
@ -69,23 +79,35 @@ gpio_aei_attach(device_t dev)
{
struct gpio_aei_softc * sc = device_get_softc(dev);
gpio_pin_t pin;
ACPI_HANDLE handle;
int err;
/* This is us. */
device_set_desc(dev, "ACPI Event Information Device");
/* Store parameters needed by gpio_aei_intr. */
sc->handle = acpi_gpiobus_get_handle(dev);
handle = acpi_gpiobus_get_handle(dev);
if (gpio_pin_get_by_acpi_index(dev, 0, &pin) != 0) {
device_printf(dev, "Unable to get the input pin\n");
return (ENXIO);
}
sprintf(sc->objname, "_%c%02X",
(pin->flags & GPIO_INTR_EDGE_MASK) ? 'E' : 'L', pin->pin);
/* Support for GPIO pins > 255 is not implemented. */
if (pin->pin > 255) {
device_printf(dev, "ACPI Event Information Device does not support pins > 255");
sc->type = ACPI_AEI_TYPE_UNKNOWN;
sc->pin = pin->pin;
if (pin->pin <= 255) {
char objname[5]; /* "_EXX" or "_LXX" */
sprintf(objname, "_%c%02X",
(pin->flags & GPIO_INTR_EDGE_MASK) ? 'E' : 'L', pin->pin);
if (ACPI_SUCCESS(AcpiGetHandle(handle, objname, &sc->handle)))
sc->type = ACPI_AEI_TYPE_ELX;
}
if (sc->type == ACPI_AEI_TYPE_UNKNOWN) {
if (ACPI_SUCCESS(AcpiGetHandle(handle, "_EVT", &sc->handle)))
sc->type = ACPI_AEI_TYPE_EVT;
}
if (sc->type == ACPI_AEI_TYPE_UNKNOWN) {
device_printf(dev, "ACPI Event Information Device type is unknown");
return (ENOTSUP);
}