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/* $OpenBSD: pwmbl.c,v 1.7 2022/11/14 07:22:44 miod Exp $ */
/*
* Copyright (c) 2019 Krystian Lewandowski
* Copyright (c) 2019 Mark Kettenis <kettenis@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/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/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
struct pwmbl_softc {
struct device sc_dev;
uint32_t *sc_pwm;
int sc_pwm_len;
uint32_t *sc_levels; /* NULL if simple ramp */
int sc_nlevels;
uint32_t sc_max_level;
uint32_t sc_def_level;
};
struct pwmbl_softc *sc_pwmbl;
int pwmbl_match(struct device *, void *, void *);
void pwmbl_attach(struct device *, struct device *, void *);
const struct cfattach pwmbl_ca = {
sizeof(struct pwmbl_softc), pwmbl_match, pwmbl_attach
};
struct cfdriver pwmbl_cd = {
NULL, "pwmbl", DV_DULL
};
int pwmbl_get_brightness(void *, uint32_t *);
int pwmbl_set_brightness(void *, uint32_t);
int pwmbl_get_param(struct wsdisplay_param *);
int pwmbl_set_param(struct wsdisplay_param *);
int
pwmbl_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "pwm-backlight");
}
void
pwmbl_attach(struct device *parent, struct device *self, void *aux)
{
struct pwmbl_softc *sc = (struct pwmbl_softc *)self;
struct fdt_attach_args *faa = aux;
uint32_t *gpios;
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, "enable-gpios");
if (len > 0) {
gpios = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(faa->fa_node, "enable-gpios", gpios, len);
gpio_controller_config_pin(&gpios[0], GPIO_CONFIG_OUTPUT);
gpio_controller_set_pin(&gpios[0], 1);
free(gpios, M_TEMP, len);
}
len = OF_getproplen(faa->fa_node, "brightness-levels");
if (len >= (int)sizeof(uint32_t)) {
sc->sc_levels = malloc(len, M_DEVBUF, M_WAITOK);
OF_getpropintarray(faa->fa_node, "brightness-levels",
sc->sc_levels, len);
sc->sc_nlevels = len / sizeof(uint32_t);
sc->sc_max_level = sc->sc_levels[sc->sc_nlevels - 1];
sc->sc_def_level = OF_getpropint(faa->fa_node,
"default-brightness-level", sc->sc_nlevels - 1);
if (sc->sc_def_level >= sc->sc_nlevels)
sc->sc_def_level = sc->sc_nlevels - 1;
sc->sc_def_level = sc->sc_levels[sc->sc_def_level];
} else {
/* No levels, assume a simple 0..255 ramp. */
sc->sc_nlevels = 256;
sc->sc_max_level = sc->sc_def_level = sc->sc_nlevels - 1;
}
printf("\n");
pwmbl_set_brightness(sc, sc->sc_def_level);
sc_pwmbl = sc;
ws_get_param = pwmbl_get_param;
ws_set_param = pwmbl_set_param;
}
int
pwmbl_get_brightness(void *cookie, uint32_t *level)
{
struct pwmbl_softc *sc = cookie;
struct pwm_state ps;
if (pwm_get_state(sc->sc_pwm, &ps))
return EINVAL;
*level = (ps.ps_pulse_width * sc->sc_max_level) / ps.ps_period;
return 0;
}
uint32_t
pwmbl_find_brightness(struct pwmbl_softc *sc, uint32_t level)
{
uint32_t mid;
int i;
if (sc->sc_levels == NULL)
return level < sc->sc_nlevels ? level : sc->sc_nlevels - 1;
for (i = 0; i < sc->sc_nlevels - 1; i++) {
mid = (sc->sc_levels[i] + sc->sc_levels[i + 1]) / 2;
if (sc->sc_levels[i] <= level && level <= mid)
return sc->sc_levels[i];
if (mid < level && level <= sc->sc_levels[i + 1])
return sc->sc_levels[i + 1];
}
if (level < sc->sc_levels[0])
return sc->sc_levels[0];
else
return sc->sc_levels[i];
}
int
pwmbl_set_brightness(void *cookie, uint32_t level)
{
struct pwmbl_softc *sc = cookie;
struct pwm_state ps;
if (pwm_init_state(sc->sc_pwm, &ps))
return EINVAL;
level = pwmbl_find_brightness(sc, level);
ps.ps_enabled = 1;
ps.ps_pulse_width = (ps.ps_period * level) / sc->sc_max_level;
return pwm_set_state(sc->sc_pwm, &ps);
}
int
pwmbl_get_param(struct wsdisplay_param *dp)
{
struct pwmbl_softc *sc = (struct pwmbl_softc *)sc_pwmbl;
uint32_t level;
switch (dp->param) {
case WSDISPLAYIO_PARAM_BRIGHTNESS:
if (pwmbl_get_brightness(sc, &level))
return -1;
dp->min = 0;
dp->max = sc->sc_max_level;
dp->curval = level;
return 0;
default:
return -1;
}
}
int
pwmbl_set_param(struct wsdisplay_param *dp)
{
struct pwmbl_softc *sc = (struct pwmbl_softc *)sc_pwmbl;
switch (dp->param) {
case WSDISPLAYIO_PARAM_BRIGHTNESS:
if (pwmbl_set_brightness(sc, dp->curval))
return -1;
return 0;
default:
return -1;
}
}
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