Add pwm_backlight
Driver for pwm-backlight compatible device. Relnotes: yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D26252
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=366371
@ -2755,6 +2755,7 @@ dev/pwm/pwmbus.c optional pwm | pwmbus
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dev/pwm/pwmbus_if.m optional pwm | pwmbus
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dev/pwm/ofw_pwm.c optional pwm fdt | pwmbus fdt
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dev/pwm/ofw_pwmbus.c optional pwm fdt | pwmbus fdt
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dev/pwm/pwm_backlight.c optional pwm pwm_backlight fdt
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dev/quicc/quicc_core.c optional quicc
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dev/ral/rt2560.c optional ral
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dev/ral/rt2661.c optional ral
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311
sys/dev/pwm/pwm_backlight.c
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311
sys/dev/pwm/pwm_backlight.c
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@ -0,0 +1,311 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/endian.h>
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#include <sys/fcntl.h>
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#include <sys/ioccom.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/slicer.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/extres/regulator/regulator.h>
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#include <dev/backlight/backlight.h>
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#include <dev/pwm/ofw_pwm.h>
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#include "backlight_if.h"
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#include "pwmbus_if.h"
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struct pwm_backlight_softc {
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device_t pwmdev;
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struct cdev *cdev;
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pwm_channel_t channel;
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uint32_t *levels;
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ssize_t nlevels;
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int default_level;
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ssize_t current_level;
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regulator_t power_supply;
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uint64_t period;
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uint64_t duty;
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bool enabled;
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};
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static int pwm_backlight_find_level_per_percent(struct pwm_backlight_softc *sc, int percent);
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static struct ofw_compat_data compat_data[] = {
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{ "pwm-backlight", 1 },
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{ NULL, 0 }
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};
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static int
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pwm_backlight_probe(device_t dev)
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{
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if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
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return (ENXIO);
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device_set_desc(dev, "PWM Backlight");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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pwm_backlight_attach(device_t dev)
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{
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struct pwm_backlight_softc *sc;
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phandle_t node;
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int rv;
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sc = device_get_softc(dev);
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node = ofw_bus_get_node(dev);
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rv = pwm_get_by_ofw_propidx(dev, node, "pwms", 0, &sc->channel);
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if (rv != 0) {
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device_printf(dev, "Cannot map pwm channel %d\n", rv);
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return (ENXIO);
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}
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if (regulator_get_by_ofw_property(dev, 0, "power-supply",
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&sc->power_supply) != 0) {
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device_printf(dev, "No power-supply property\n");
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return (ENXIO);
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}
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if (OF_hasprop(node, "brightness-levels")) {
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sc->nlevels = OF_getencprop_alloc(node, "brightness-levels",
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(void **)&sc->levels);
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if (sc->nlevels <= 0) {
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device_printf(dev, "Cannot parse brightness levels\n");
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return (ENXIO);
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}
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sc->nlevels /= sizeof(uint32_t);
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if (OF_getencprop(node, "default-brightness-level",
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&sc->default_level, sizeof(uint32_t)) <= 0) {
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device_printf(dev, "No default-brightness-level while brightness-levels is specified\n");
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return (ENXIO);
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} else {
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if (sc->default_level > sc->nlevels) {
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device_printf(dev, "default-brightness-level isn't present in brightness-levels range\n");
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return (ENXIO);
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}
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sc->channel->duty = sc->channel->period * sc->levels[sc->default_level] / 100;
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}
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if (bootverbose) {
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device_printf(dev, "Number of levels: %zd\n", sc->nlevels);
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device_printf(dev, "Configured period time: %lu\n", sc->channel->period);
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device_printf(dev, "Default duty cycle: %lu\n", sc->channel->duty);
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}
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} else {
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/* Get the current backlight level */
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PWMBUS_CHANNEL_GET_CONFIG(sc->channel->dev,
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sc->channel->channel,
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(unsigned int *)&sc->channel->period,
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(unsigned int *)&sc->channel->duty);
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if (sc->channel->duty > sc->channel->period)
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sc->channel->duty = sc->channel->period;
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if (bootverbose) {
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device_printf(dev, "Configured period time: %lu\n", sc->channel->period);
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device_printf(dev, "Default duty cycle: %lu\n", sc->channel->duty);
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}
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}
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regulator_enable(sc->power_supply);
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sc->channel->enabled = true;
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PWMBUS_CHANNEL_CONFIG(sc->channel->dev, sc->channel->channel,
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sc->channel->period, sc->channel->duty);
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PWMBUS_CHANNEL_ENABLE(sc->channel->dev, sc->channel->channel,
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sc->channel->enabled);
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sc->current_level = pwm_backlight_find_level_per_percent(sc,
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sc->channel->period / sc->channel->duty);
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sc->cdev = backlight_register("pwm_backlight", dev);
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if (sc->cdev == NULL)
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device_printf(dev, "Cannot register as a backlight\n");
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return (0);
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}
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static int
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pwm_backlight_detach(device_t dev)
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{
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struct pwm_backlight_softc *sc;
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sc = device_get_softc(dev);
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if (sc->nlevels > 0)
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OF_prop_free(sc->levels);
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regulator_disable(sc->power_supply);
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backlight_destroy(sc->cdev);
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return (0);
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}
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static int
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pwm_backlight_find_level_per_percent(struct pwm_backlight_softc *sc, int percent)
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{
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int i;
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int diff;
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if (percent < 0 || percent > 100)
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return (-1);
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for (i = 0, diff = 0; i < sc->nlevels; i++) {
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if (sc->levels[i] == percent)
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return (i);
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else if (sc->levels[i] < percent)
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diff = percent - sc->levels[i];
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else {
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if (diff < abs((percent - sc->levels[i])))
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return (i - 1);
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else
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return (i);
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}
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}
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return (-1);
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}
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static int
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pwm_backlight_update_status(device_t dev, struct backlight_props *props)
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{
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struct pwm_backlight_softc *sc;
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int reg_status;
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int error;
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sc = device_get_softc(dev);
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if (sc->nlevels != 0) {
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error = pwm_backlight_find_level_per_percent(sc,
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props->brightness);
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if (error < 0)
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return (ERANGE);
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sc->current_level = error;
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sc->channel->duty = sc->channel->period *
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sc->levels[sc->current_level] / 100;
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} else {
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if (props->brightness > 100 || props->brightness < 0)
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return (ERANGE);
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sc->channel->duty = sc->channel->period *
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props->brightness / 100;
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}
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sc->channel->enabled = true;
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PWMBUS_CHANNEL_CONFIG(sc->channel->dev, sc->channel->channel,
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sc->channel->period, sc->channel->duty);
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PWMBUS_CHANNEL_ENABLE(sc->channel->dev, sc->channel->channel,
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sc->channel->enabled);
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error = regulator_status(sc->power_supply, ®_status);
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if (error != 0)
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device_printf(dev,
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"Cannot get power-supply status: %d\n", error);
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else {
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if (props->brightness > 0) {
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if (reg_status != REGULATOR_STATUS_ENABLED)
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regulator_enable(sc->power_supply);
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} else {
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if (reg_status == REGULATOR_STATUS_ENABLED)
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regulator_disable(sc->power_supply);
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}
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}
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return (0);
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}
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static int
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pwm_backlight_get_status(device_t dev, struct backlight_props *props)
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{
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struct pwm_backlight_softc *sc;
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int i;
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sc = device_get_softc(dev);
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if (sc->nlevels != 0) {
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props->brightness = sc->levels[sc->current_level];
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props->nlevels = sc->nlevels;
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for (i = 0; i < sc->nlevels; i++)
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props->levels[i] = sc->levels[i];
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} else {
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props->brightness = sc->channel->duty * 100 / sc->channel->period;
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props->nlevels = 0;
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}
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return (0);
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}
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static int
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pwm_backlight_get_info(device_t dev, struct backlight_info *info)
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{
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info->type = BACKLIGHT_TYPE_PANEL;
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strlcpy(info->name, "pwm-backlight", BACKLIGHTMAXNAMELENGTH);
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return (0);
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}
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static device_method_t pwm_backlight_methods[] = {
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/* device_if */
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DEVMETHOD(device_probe, pwm_backlight_probe),
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DEVMETHOD(device_attach, pwm_backlight_attach),
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DEVMETHOD(device_detach, pwm_backlight_detach),
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/* backlight interface */
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DEVMETHOD(backlight_update_status, pwm_backlight_update_status),
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DEVMETHOD(backlight_get_status, pwm_backlight_get_status),
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DEVMETHOD(backlight_get_info, pwm_backlight_get_info),
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DEVMETHOD_END
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};
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driver_t pwm_backlight_driver = {
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"pwm_backlight",
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pwm_backlight_methods,
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sizeof(struct pwm_backlight_softc),
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};
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devclass_t pwm_backlight_devclass;
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DRIVER_MODULE(pwm_backlight, simplebus, pwm_backlight_driver,
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pwm_backlight_devclass, 0, 0);
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OFWBUS_PNP_INFO(compat_data);
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@ -6,4 +6,8 @@ SUBDIR = \
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pwmbus \
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pwmc \
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.if !empty(OPT_FDT)
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SUBDIR += pwm_backlight
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.endif
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.include <bsd.subdir.mk>
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15
sys/modules/pwm/pwm_backlight/Makefile
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15
sys/modules/pwm/pwm_backlight/Makefile
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# $FreeBSD$
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.PATH: ${SRCTOP}/sys/dev/pwm
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KMOD= pwm_backlight
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SRCS= pwm_backlight.c
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SRCS+= \
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backlight_if.h \
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bus_if.h \
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device_if.h \
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opt_platform.h \
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pwmbus_if.h \
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ofw_bus_if.h
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.include <bsd.kmod.mk>
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