306 lines
8.3 KiB
C
306 lines
8.3 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
|
|
*
|
|
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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>
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/ioccom.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/slicer.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#include <dev/extres/regulator/regulator.h>
|
|
|
|
#include <dev/backlight/backlight.h>
|
|
|
|
#include <dev/pwm/ofw_pwm.h>
|
|
|
|
#include "backlight_if.h"
|
|
#include "pwmbus_if.h"
|
|
|
|
struct pwm_backlight_softc {
|
|
device_t pwmdev;
|
|
struct cdev *cdev;
|
|
|
|
pwm_channel_t channel;
|
|
uint32_t *levels;
|
|
ssize_t nlevels;
|
|
int default_level;
|
|
ssize_t current_level;
|
|
|
|
regulator_t power_supply;
|
|
uint64_t period;
|
|
uint64_t duty;
|
|
bool enabled;
|
|
};
|
|
|
|
static int pwm_backlight_find_level_per_percent(struct pwm_backlight_softc *sc, int percent);
|
|
|
|
static struct ofw_compat_data compat_data[] = {
|
|
{ "pwm-backlight", 1 },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
static int
|
|
pwm_backlight_probe(device_t dev)
|
|
{
|
|
|
|
if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "PWM Backlight");
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
static int
|
|
pwm_backlight_attach(device_t dev)
|
|
{
|
|
struct pwm_backlight_softc *sc;
|
|
phandle_t node;
|
|
int rv;
|
|
|
|
sc = device_get_softc(dev);
|
|
node = ofw_bus_get_node(dev);
|
|
|
|
rv = pwm_get_by_ofw_propidx(dev, node, "pwms", 0, &sc->channel);
|
|
if (rv != 0) {
|
|
device_printf(dev, "Cannot map pwm channel %d\n", rv);
|
|
return (ENXIO);
|
|
}
|
|
|
|
if (regulator_get_by_ofw_property(dev, 0, "power-supply",
|
|
&sc->power_supply) != 0) {
|
|
device_printf(dev, "No power-supply property\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
if (OF_hasprop(node, "brightness-levels")) {
|
|
sc->nlevels = OF_getencprop_alloc(node, "brightness-levels",
|
|
(void **)&sc->levels);
|
|
if (sc->nlevels <= 0) {
|
|
device_printf(dev, "Cannot parse brightness levels\n");
|
|
return (ENXIO);
|
|
}
|
|
sc->nlevels /= sizeof(uint32_t);
|
|
|
|
if (OF_getencprop(node, "default-brightness-level",
|
|
&sc->default_level, sizeof(uint32_t)) <= 0) {
|
|
device_printf(dev, "No default-brightness-level while brightness-levels is specified\n");
|
|
return (ENXIO);
|
|
} else {
|
|
if (sc->default_level > sc->nlevels) {
|
|
device_printf(dev, "default-brightness-level isn't present in brightness-levels range\n");
|
|
return (ENXIO);
|
|
}
|
|
sc->channel->duty = sc->channel->period * sc->levels[sc->default_level] / 100;
|
|
}
|
|
|
|
if (bootverbose) {
|
|
device_printf(dev, "Number of levels: %zd\n", sc->nlevels);
|
|
device_printf(dev, "Configured period time: %ju\n", (uintmax_t)sc->channel->period);
|
|
device_printf(dev, "Default duty cycle: %ju\n", (uintmax_t)sc->channel->duty);
|
|
}
|
|
} else {
|
|
/* Get the current backlight level */
|
|
PWMBUS_CHANNEL_GET_CONFIG(sc->channel->dev,
|
|
sc->channel->channel,
|
|
(unsigned int *)&sc->channel->period,
|
|
(unsigned int *)&sc->channel->duty);
|
|
if (sc->channel->duty > sc->channel->period)
|
|
sc->channel->duty = sc->channel->period;
|
|
if (bootverbose) {
|
|
device_printf(dev, "Configured period time: %ju\n", (uintmax_t)sc->channel->period);
|
|
device_printf(dev, "Default duty cycle: %ju\n", (uintmax_t)sc->channel->duty);
|
|
}
|
|
}
|
|
|
|
regulator_enable(sc->power_supply);
|
|
sc->channel->enabled = true;
|
|
PWMBUS_CHANNEL_CONFIG(sc->channel->dev, sc->channel->channel,
|
|
sc->channel->period, sc->channel->duty);
|
|
PWMBUS_CHANNEL_ENABLE(sc->channel->dev, sc->channel->channel,
|
|
sc->channel->enabled);
|
|
|
|
sc->current_level = pwm_backlight_find_level_per_percent(sc,
|
|
sc->channel->period / sc->channel->duty);
|
|
sc->cdev = backlight_register("pwm_backlight", dev);
|
|
if (sc->cdev == NULL)
|
|
device_printf(dev, "Cannot register as a backlight\n");
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pwm_backlight_detach(device_t dev)
|
|
{
|
|
struct pwm_backlight_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (sc->nlevels > 0)
|
|
OF_prop_free(sc->levels);
|
|
regulator_disable(sc->power_supply);
|
|
backlight_destroy(sc->cdev);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pwm_backlight_find_level_per_percent(struct pwm_backlight_softc *sc, int percent)
|
|
{
|
|
int i;
|
|
int diff;
|
|
|
|
if (percent < 0 || percent > 100)
|
|
return (-1);
|
|
|
|
for (i = 0, diff = 0; i < sc->nlevels; i++) {
|
|
if (sc->levels[i] == percent)
|
|
return (i);
|
|
else if (sc->levels[i] < percent)
|
|
diff = percent - sc->levels[i];
|
|
else {
|
|
if (diff < abs((percent - sc->levels[i])))
|
|
return (i - 1);
|
|
else
|
|
return (i);
|
|
}
|
|
}
|
|
|
|
return (-1);
|
|
}
|
|
|
|
static int
|
|
pwm_backlight_update_status(device_t dev, struct backlight_props *props)
|
|
{
|
|
struct pwm_backlight_softc *sc;
|
|
int reg_status;
|
|
int error;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
if (sc->nlevels != 0) {
|
|
error = pwm_backlight_find_level_per_percent(sc,
|
|
props->brightness);
|
|
if (error < 0)
|
|
return (ERANGE);
|
|
sc->current_level = error;
|
|
sc->channel->duty = sc->channel->period *
|
|
sc->levels[sc->current_level] / 100;
|
|
} else {
|
|
if (props->brightness > 100 || props->brightness < 0)
|
|
return (ERANGE);
|
|
sc->channel->duty = sc->channel->period *
|
|
props->brightness / 100;
|
|
}
|
|
sc->channel->enabled = true;
|
|
PWMBUS_CHANNEL_CONFIG(sc->channel->dev, sc->channel->channel,
|
|
sc->channel->period, sc->channel->duty);
|
|
PWMBUS_CHANNEL_ENABLE(sc->channel->dev, sc->channel->channel,
|
|
sc->channel->enabled);
|
|
error = regulator_status(sc->power_supply, ®_status);
|
|
if (error != 0)
|
|
device_printf(dev,
|
|
"Cannot get power-supply status: %d\n", error);
|
|
else {
|
|
if (props->brightness > 0) {
|
|
if (reg_status != REGULATOR_STATUS_ENABLED)
|
|
regulator_enable(sc->power_supply);
|
|
} else {
|
|
if (reg_status == REGULATOR_STATUS_ENABLED)
|
|
regulator_disable(sc->power_supply);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pwm_backlight_get_status(device_t dev, struct backlight_props *props)
|
|
{
|
|
struct pwm_backlight_softc *sc;
|
|
int i;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
if (sc->nlevels != 0) {
|
|
props->brightness = sc->levels[sc->current_level];
|
|
props->nlevels = sc->nlevels;
|
|
for (i = 0; i < sc->nlevels; i++)
|
|
props->levels[i] = sc->levels[i];
|
|
} else {
|
|
props->brightness = sc->channel->duty * 100 / sc->channel->period;
|
|
props->nlevels = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pwm_backlight_get_info(device_t dev, struct backlight_info *info)
|
|
{
|
|
|
|
info->type = BACKLIGHT_TYPE_PANEL;
|
|
strlcpy(info->name, "pwm-backlight", BACKLIGHTMAXNAMELENGTH);
|
|
return (0);
|
|
}
|
|
|
|
static device_method_t pwm_backlight_methods[] = {
|
|
/* device_if */
|
|
DEVMETHOD(device_probe, pwm_backlight_probe),
|
|
DEVMETHOD(device_attach, pwm_backlight_attach),
|
|
DEVMETHOD(device_detach, pwm_backlight_detach),
|
|
|
|
/* backlight interface */
|
|
DEVMETHOD(backlight_update_status, pwm_backlight_update_status),
|
|
DEVMETHOD(backlight_get_status, pwm_backlight_get_status),
|
|
DEVMETHOD(backlight_get_info, pwm_backlight_get_info),
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
driver_t pwm_backlight_driver = {
|
|
"pwm_backlight",
|
|
pwm_backlight_methods,
|
|
sizeof(struct pwm_backlight_softc),
|
|
};
|
|
|
|
DRIVER_MODULE(pwm_backlight, simplebus, pwm_backlight_driver, 0, 0);
|
|
MODULE_DEPEND(pwm_backlight, backlight, 1, 1, 1);
|
|
OFWBUS_PNP_INFO(compat_data);
|