161 lines
4 KiB
C
161 lines
4 KiB
C
/* $OpenBSD: pwmreg.c,v 1.2 2021/10/24 17:52:26 mpi 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 *);
|
|
|
|
const 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);
|
|
}
|