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Add basic pwm-fan driver. This doesn't have any smarts yet other than 

turning the fan on at 100% duty cycle.
This commit is contained in:
jmcneill 2018-07-04 23:08:06 +00:00
parent adc41efb5b
commit aba8b2b275
2 changed files with 133 additions and 1 deletions
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6
sys/dev/fdt/files.fdt
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@ -1,4 +1,4 @@
# $NetBSD: files.fdt,v 1.35 2018/06/30 16:22:56 jmcneill Exp $
# $NetBSD: files.fdt,v 1.36 2018/07/04 23:08:06 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@ -78,6 +78,10 @@ device pwmbacklight
attach pwmbacklight at fdt
file dev/fdt/pwm_backlight.c pwmbacklight
device pwmfan
attach pwmfan at fdt
file dev/fdt/pwm_fan.c pwmfan
device ausoc: audiobus
attach ausoc at fdt
file dev/fdt/ausoc.c ausoc

128
sys/dev/fdt/pwm_fan.c Normal file
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@ -0,0 +1,128 @@
/* $NetBSD: pwm_fan.c,v 1.1 2018/07/04 23:08:06 jmcneill Exp $ */
/*-
* Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pwm_fan.c,v 1.1 2018/07/04 23:08:06 jmcneill Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/kmem.h>
#include <sys/gpio.h>
#include <dev/pwm/pwmvar.h>
#include <dev/fdt/fdtvar.h>
struct pwm_fan_softc {
device_t sc_dev;
pwm_tag_t sc_pwm;
struct fdtbus_gpio_pin *sc_pin;
u_int *sc_levels;
u_int sc_nlevels;
};
static int pwm_fan_match(device_t, cfdata_t, void *);
static void pwm_fan_attach(device_t, device_t, void *);
static void pwm_fan_set(struct pwm_fan_softc *, u_int);
static const char *compatible[] = {
"pwm-fan",
NULL
};
CFATTACH_DECL_NEW(pwmfan, sizeof(struct pwm_fan_softc),
pwm_fan_match, pwm_fan_attach, NULL, NULL);
static int
pwm_fan_match(device_t parent, cfdata_t cf, void *aux)
{
struct fdt_attach_args * const faa = aux;
return of_match_compatible(faa->faa_phandle, compatible);
}
static void
pwm_fan_attach(device_t parent, device_t self, void *aux)
{
struct pwm_fan_softc * const sc = device_private(self);
struct fdt_attach_args * const faa = aux;
const int phandle = faa->faa_phandle;
const u_int *levels;
u_int n;
int len;
sc->sc_dev = self;
sc->sc_pwm = fdtbus_pwm_acquire(phandle, "pwms");
if (sc->sc_pwm == NULL) {
aprint_error(": couldn't acquire pwm\n");
return;
}
levels = fdtbus_get_prop(phandle, "cooling-levels", &len);
if (len < 4) {
aprint_error(": couldn't get 'cooling-levels' property\n");
return;
}
sc->sc_levels = kmem_alloc(len, KM_SLEEP);
sc->sc_nlevels = len / 4;
for (n = 0; n < sc->sc_nlevels; n++)
sc->sc_levels[n] = be32toh(levels[n]);
aprint_naive("\n");
aprint_normal(": PWM Fan");
aprint_normal(" (levels");
for (n = 0; n < sc->sc_nlevels; n++) {
aprint_normal(" %u%%", (sc->sc_levels[n] * 100) / 255);
}
aprint_normal(")\n");
/* Select the highest cooling level */
pwm_fan_set(sc, 255);
}
static void
pwm_fan_set(struct pwm_fan_softc *sc, u_int level)
{
struct pwm_config conf;
if (level > 255)
level = 255;
aprint_debug_dev(sc->sc_dev, "set duty cycle to %u%%\n", (level * 100) / 255);
pwm_disable(sc->sc_pwm);
pwm_get_config(sc->sc_pwm, &conf);
conf.duty_cycle = (conf.period * level) / 255;
pwm_set_config(sc->sc_pwm, &conf);
pwm_enable(sc->sc_pwm);
}