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gpiopower: trigger low, high and both edges

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Power off or reset may be activated either by low or high signal or by an
edge.  So, try everything.

Also, the driver now supports DTS properties for timings.

Finally, the driver does not change the pin configuration during attach.
It is assumed that the pin is already in a state that does not trigger
the power event (otherwise we wouldn't be running).
This commit is contained in:
Andriy Gapon 2024-01-28 13:29:41 +02:00
parent 197944948e
commit 320e4beb97
1 changed files with 25 additions and 3 deletions
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28
sys/dev/gpio/gpiopower.c
View file

@ -34,6 +34,7 @@
#include <sys/module.h>
#include <sys/reboot.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/gpio/gpiobusvar.h>
@ -41,6 +42,9 @@
struct gpiopower_softc {
gpio_pin_t sc_pin;
int sc_rbmask;
int sc_hi_period;
int sc_lo_period;
int sc_timeout;
};
static void gpiopower_assert(device_t dev, int howto);
@ -65,6 +69,7 @@ gpiopower_attach(device_t dev)
{
struct gpiopower_softc *sc;
phandle_t node;
uint32_t prop;
sc = device_get_softc(dev);
@ -80,9 +85,20 @@ gpiopower_attach(device_t dev)
sc->sc_rbmask = RB_HALT | RB_POWEROFF;
else
sc->sc_rbmask = 0;
sc->sc_hi_period = 100000;
sc->sc_lo_period = 100000;
sc->sc_timeout = 1000000;
if ((OF_getprop(node, "active-delay-ms", &prop, sizeof(prop))) > 0)
sc->sc_hi_period = fdt32_to_cpu(prop) * 1000;
if ((OF_getprop(node, "inactive-delay-ms", &prop, sizeof(prop))) > 0)
sc->sc_lo_period = fdt32_to_cpu(prop) * 1000;
if ((OF_getprop(node, "timeout-ms", &prop, sizeof(prop))) > 0)
sc->sc_timeout = fdt32_to_cpu(prop) * 1000;
EVENTHANDLER_REGISTER(shutdown_final, gpiopower_assert, dev,
SHUTDOWN_PRI_LAST);
gpio_pin_setflags(sc->sc_pin, GPIO_PIN_OUTPUT);
return (0);
}
@ -107,10 +123,16 @@ gpiopower_assert(device_t dev, int howto)
else
return;
gpio_pin_setflags(sc->sc_pin, GPIO_PIN_OUTPUT);
gpio_pin_set_active(sc->sc_pin, true);
DELAY(sc->sc_hi_period);
gpio_pin_set_active(sc->sc_pin, false);
DELAY(sc->sc_lo_period);
gpio_pin_set_active(sc->sc_pin, true);
DELAY(sc->sc_timeout);
/* Wait a second for it to trip */
DELAY(10000000);
device_printf(dev, "%s failed\n",
(howto & RB_POWEROFF) != 0 ? "power off" : "reset");
}
static device_method_t gpiopower_methods[] = {