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/* $OpenBSD: pwmfan.c,v 1.2 2021/10/24 17:52:26 mpi Exp $ */
/*
* Copyright (c) 2019 Krystian Lewandowski
* Copyright (c) 2019 Mark Kettenis <kettenis@openbsd.org>
* Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
*
* 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/malloc.h>
#include <machine/fdt.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_thermal.h>
struct pwmfan_softc {
struct device sc_dev;
uint32_t *sc_pwm;
int sc_pwm_len;
uint32_t *sc_levels;
int sc_nlevels;
int sc_curlevel;
struct cooling_device sc_cd;
};
int pwmfan_match(struct device *, void *, void *);
void pwmfan_attach(struct device *, struct device *, void *);
const struct cfattach pwmfan_ca = {
sizeof(struct pwmfan_softc), pwmfan_match, pwmfan_attach
};
struct cfdriver pwmfan_cd = {
NULL, "pwmfan", DV_DULL
};
uint32_t pwmfan_get_cooling_level(void *, uint32_t *);
void pwmfan_set_cooling_level(void *, uint32_t *, uint32_t);
int
pwmfan_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "pwm-fan");
}
void
pwmfan_attach(struct device *parent, struct device *self, void *aux)
{
struct pwmfan_softc *sc = (struct pwmfan_softc *)self;
struct fdt_attach_args *faa = aux;
int len;
len = OF_getproplen(faa->fa_node, "pwms");
if (len < 0) {
printf(": no pwm\n");
return;
}
sc->sc_pwm = malloc(len, M_DEVBUF, M_WAITOK);
OF_getpropintarray(faa->fa_node, "pwms", sc->sc_pwm, len);
sc->sc_pwm_len = len;
len = OF_getproplen(faa->fa_node, "cooling-levels");
if (len < 0) {
free(sc->sc_pwm, M_DEVBUF, sc->sc_pwm_len);
printf(": no cooling levels\n");
return;
}
sc->sc_levels = malloc(len, M_DEVBUF, M_WAITOK);
OF_getpropintarray(faa->fa_node, "cooling-levels",
sc->sc_levels, len);
sc->sc_nlevels = len / sizeof(uint32_t);
printf("\n");
sc->sc_cd.cd_node = faa->fa_node;
sc->sc_cd.cd_cookie = sc;
sc->sc_cd.cd_get_level = pwmfan_get_cooling_level;
sc->sc_cd.cd_set_level = pwmfan_set_cooling_level;
cooling_device_register(&sc->sc_cd);
}
uint32_t
pwmfan_get_cooling_level(void *cookie, uint32_t *cells)
{
struct pwmfan_softc *sc = cookie;
return sc->sc_curlevel;
}
void
pwmfan_set_cooling_level(void *cookie, uint32_t *cells, uint32_t level)
{
struct pwmfan_softc *sc = cookie;
struct pwm_state ps;
if (level == sc->sc_curlevel || level > sc->sc_nlevels ||
sc->sc_levels[level] > 255)
return;
if (pwm_init_state(sc->sc_pwm, &ps))
return;
sc->sc_curlevel = level;
level = sc->sc_levels[level];
ps.ps_enabled = level ? 1 : 0;
ps.ps_pulse_width = (ps.ps_period * level) / 255;
pwm_set_state(sc->sc_pwm, &ps);
}
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