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/* $OpenBSD: gpiokeys.c,v 1.3 2023/03/31 12:07:54 kn Exp $ */
/*
* Copyright (c) 2021 Klemens Nanni <kn@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/gpio/gpiovar.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <sys/sensors.h>
#define DEVNAME(_s) ((_s)->sc_dev.dv_xname)
/*
* Defines from Linux, see:
* Documentation/input/event-codes.rst
* include/dt-bindings/input/linux-event-codes.h
*/
enum gpiokeys_event_type {
GPIOKEYS_EV_KEY = 1,
GPIOKEYS_EV_SW = 5,
};
enum gpiokeys_switch_event {
GPIOKEYS_SW_LID = 0, /* set = lid closed */
};
struct gpiokeys_key {
uint32_t *key_pin;
uint32_t key_input_type;
uint32_t key_code;
struct ksensor key_sensor;
SLIST_ENTRY(gpiokeys_key) entries;
};
struct gpiokeys_softc {
struct device sc_dev;
int sc_node;
struct ksensordev sc_sensordev;
SLIST_HEAD(, gpiokeys_key) sc_keys;
};
int gpiokeys_match(struct device *, void *, void *);
void gpiokeys_attach(struct device *, struct device *, void *);
const struct cfattach gpiokeys_ca = {
sizeof (struct gpiokeys_softc), gpiokeys_match, gpiokeys_attach
};
struct cfdriver gpiokeys_cd = {
NULL, "gpiokeys", DV_DULL
};
void gpiokeys_update_key(void *);
int
gpiokeys_match(struct device *parent, void *match, void *aux)
{
const struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "gpio-keys") ||
OF_is_compatible(faa->fa_node, "gpio-keys-polled");
}
void
gpiokeys_attach(struct device *parent, struct device *self, void *aux)
{
struct gpiokeys_softc *sc = (struct gpiokeys_softc *)self;
struct fdt_attach_args *faa = aux;
struct gpiokeys_key *key;
char *label;
uint32_t code;
int node, len, gpios_len;
int have_labels = 0, have_sensors = 0;
SLIST_INIT(&sc->sc_keys);
pinctrl_byname(faa->fa_node, "default");
for (node = OF_child(faa->fa_node); node; node = OF_peer(node)) {
if (OF_getprop(node, "linux,code", &code, sizeof(code)) == -1)
continue;
gpios_len = OF_getproplen(node, "gpios");
if (gpios_len <= 0)
continue;
label = NULL;
len = OF_getproplen(node, "label");
if (len > 0) {
label = malloc(len, M_TEMP, M_WAITOK);
if (OF_getprop(node, "label", label, len) != len) {
free(label, M_TEMP, len);
continue;
}
}
key = malloc(sizeof(*key), M_DEVBUF, M_WAITOK | M_ZERO);
key->key_input_type = OF_getpropint(node, "linux,input-type",
GPIOKEYS_EV_KEY);
key->key_code = code;
key->key_pin = malloc(gpios_len, M_DEVBUF, M_WAITOK);
OF_getpropintarray(node, "gpios", key->key_pin, gpios_len);
gpio_controller_config_pin(key->key_pin, GPIO_CONFIG_INPUT);
switch (key->key_input_type) {
case GPIOKEYS_EV_SW:
switch (key->key_code) {
case GPIOKEYS_SW_LID:
strlcpy(key->key_sensor.desc, "lid open",
sizeof(key->key_sensor.desc));
key->key_sensor.type = SENSOR_INDICATOR;
sensor_attach(&sc->sc_sensordev, &key->key_sensor);
sensor_task_register(key, gpiokeys_update_key, 1);
have_sensors = 1;
break;
}
break;
}
if (label) {
printf("%s \"%s\"", have_labels ? "," : ":", label);
free(label, M_TEMP, len);
have_labels = 1;
}
SLIST_INSERT_HEAD(&sc->sc_keys, key, entries);
}
if (have_sensors) {
strlcpy(sc->sc_sensordev.xname, DEVNAME(sc),
sizeof(sc->sc_sensordev.xname));
sensordev_install(&sc->sc_sensordev);
}
if (SLIST_EMPTY(&sc->sc_keys))
printf(": no keys");
printf("\n");
}
void
gpiokeys_update_key(void *arg)
{
struct gpiokeys_key *key = arg;
int val;
val = gpio_controller_get_pin(key->key_pin);
switch (key->key_input_type) {
case GPIOKEYS_EV_SW:
switch (key->key_code) {
case GPIOKEYS_SW_LID:
/*
* Match acpibtn(4), i.e. closed ThinkPad lid yields
* hw.sensors.acpibtn1.indicator0=Off (lid open)
*/
key->key_sensor.value = !val;
break;
}
break;
}
}
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