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/* $OpenBSD: pwmreg.c,v 1.1 2019/09/30 20:44:13 kettenis Exp $ */
/*
* 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/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_regulator.h>
#include <dev/ofw/fdt.h>
struct pwmreg_softc {
struct device sc_dev;
uint32_t *sc_pwm;
uint32_t sc_dutycycle_unit;
uint32_t sc_dutycycle_range[2];
struct regulator_device sc_rd;
};
int pwmreg_match(struct device *, void *, void *);
void pwmreg_attach(struct device *, struct device *, void *);
struct cfattach pwmreg_ca = {
sizeof (struct pwmreg_softc), pwmreg_match, pwmreg_attach
};
struct cfdriver pwmreg_cd = {
NULL, "pwmreg", DV_DULL
};
uint32_t pwmreg_get_voltage(void *);
int pwmreg_set_voltage(void *, uint32_t);
int pwmreg_enable(void *, int);
int
pwmreg_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "pwm-regulator");
}
void
pwmreg_attach(struct device *parent, struct device *self, void *aux)
{
struct pwmreg_softc *sc = (struct pwmreg_softc *)self;
struct fdt_attach_args *faa = aux;
int len;
if (OF_getproplen(faa->fa_node, "voltage-tables") > 0) {
printf(": voltage table mode unsupported\n");
return;
}
len = OF_getproplen(faa->fa_node, "pwms");
if (len <= 4) {
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_dutycycle_unit =
OF_getpropint(faa->fa_node, "pwm-dutycycle-unit", 100);
sc->sc_dutycycle_range[0] = 0;
sc->sc_dutycycle_range[1] = 100;
OF_getpropintarray(faa->fa_node, "pwm-dutycycle-range",
sc->sc_dutycycle_range, sizeof(sc->sc_dutycycle_range));
printf("\n");
sc->sc_rd.rd_node = faa->fa_node;
sc->sc_rd.rd_cookie = sc;
sc->sc_rd.rd_get_voltage = pwmreg_get_voltage;
sc->sc_rd.rd_set_voltage = pwmreg_set_voltage;
sc->sc_rd.rd_enable = pwmreg_enable;
regulator_register(&sc->sc_rd);
}
uint32_t
pwmreg_get_voltage(void *cookie)
{
struct pwmreg_softc *sc = cookie;
struct pwm_state ps;
int32_t x0, x1, y0, y1;
int32_t x, y;
if (pwm_get_state(sc->sc_pwm, &ps))
return 0;
x0 = sc->sc_dutycycle_range[0];
x1 = sc->sc_dutycycle_range[1];
y0 = sc->sc_rd.rd_volt_min;
y1 = sc->sc_rd.rd_volt_max;
x = (ps.ps_pulse_width * sc->sc_dutycycle_unit) / ps.ps_period;
y = y0 + (x - x0) * (y1 - y0) / (x1 - x0);
return y;
}
int
pwmreg_set_voltage(void *cookie, uint32_t voltage)
{
struct pwmreg_softc *sc = cookie;
struct pwm_state ps;
int32_t x0, x1, y0, y1;
int32_t x, y;
if (pwm_init_state(sc->sc_pwm, &ps))
return 0;
x0 = sc->sc_rd.rd_volt_min;
x1 = sc->sc_rd.rd_volt_max;
y0 = sc->sc_dutycycle_range[0];
y1 = sc->sc_dutycycle_range[1];
x = voltage;
y = y0 + (x - x0) * (y1 - y0) / (x1 - x0);
ps.ps_pulse_width = (y * ps.ps_period) / sc->sc_dutycycle_unit;
return pwm_set_state(sc->sc_pwm, &ps);
}
int
pwmreg_enable(void *cookie, int on)
{
struct pwmreg_softc *sc = cookie;
struct pwm_state ps;
int error;
error = pwm_get_state(sc->sc_pwm, &ps);
if (error)
return error;
if (ps.ps_enabled == on)
return 0;
ps.ps_enabled = on;
return pwm_set_state(sc->sc_pwm, &ps);
}
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