169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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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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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/limits.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <dev/backlight/backlight.h>
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#include "backlight_if.h"
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static struct sx backlight_sx;
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static MALLOC_DEFINE(M_BACKLIGHT, "BACKLIGHT", "Backlight driver");
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static struct unrhdr *backlight_unit;
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struct backlight_softc {
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struct cdev *cdev;
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struct cdev *alias;
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int unit;
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device_t dev;
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uint32_t cached_brightness;
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};
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static int
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backlight_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
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int fflag, struct thread *td)
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{
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struct backlight_softc *sc;
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struct backlight_props props;
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struct backlight_info info;
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int error;
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sc = dev->si_drv1;
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switch (cmd) {
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case BACKLIGHTGETSTATUS:
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/* Call the driver function so it fills up the props */
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bcopy(data, &props, sizeof(struct backlight_props));
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error = BACKLIGHT_GET_STATUS(sc->dev, &props);
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if (error == 0) {
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bcopy(&props, data, sizeof(struct backlight_props));
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sc->cached_brightness = props.brightness;
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}
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break;
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case BACKLIGHTUPDATESTATUS:
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bcopy(data, &props, sizeof(struct backlight_props));
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if (props.brightness == sc->cached_brightness)
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return (0);
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error = BACKLIGHT_UPDATE_STATUS(sc->dev, &props);
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if (error == 0) {
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bcopy(&props, data, sizeof(struct backlight_props));
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sc->cached_brightness = props.brightness;
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}
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break;
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case BACKLIGHTGETINFO:
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memset(&info, 0, sizeof(info));
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error = BACKLIGHT_GET_INFO(sc->dev, &info);
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if (error == 0)
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bcopy(&info, data, sizeof(struct backlight_info));
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break;
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}
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return (error);
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}
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static struct cdevsw backlight_cdevsw = {
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.d_version = D_VERSION,
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.d_ioctl = backlight_ioctl,
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.d_name = "backlight",
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};
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struct cdev *
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backlight_register(const char *name, device_t dev)
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{
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struct make_dev_args args;
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struct backlight_softc *sc;
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struct backlight_props props;
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int error;
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sc = malloc(sizeof(*sc), M_BACKLIGHT, M_WAITOK | M_ZERO);
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sx_xlock(&backlight_sx);
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sc->unit = alloc_unr(backlight_unit);
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sc->dev = dev;
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make_dev_args_init(&args);
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args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
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args.mda_devsw = &backlight_cdevsw;
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args.mda_uid = UID_ROOT;
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args.mda_gid = GID_VIDEO;
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args.mda_mode = 0660;
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args.mda_si_drv1 = sc;
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error = make_dev_s(&args, &sc->cdev, "backlight/backlight%d", sc->unit);
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if (error != 0)
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goto fail;
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error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK,
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&sc->alias, sc->cdev, "backlight/%s%d", name, sc->unit);
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if (error != 0)
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device_printf(dev, "Cannot register with alias %s%d\n", name,
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sc->unit);
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sx_xunlock(&backlight_sx);
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error = BACKLIGHT_GET_STATUS(sc->dev, &props);
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sc->cached_brightness = props.brightness;
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return (sc->cdev);
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fail:
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sx_xunlock(&backlight_sx);
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return (NULL);
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}
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int
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backlight_destroy(struct cdev *dev)
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{
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struct backlight_softc *sc;
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sc = dev->si_drv1;
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sx_xlock(&backlight_sx);
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free_unr(backlight_unit, sc->unit);
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destroy_dev(dev);
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sx_xunlock(&backlight_sx);
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return (0);
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}
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static void
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backlight_drvinit(void *unused)
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{
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backlight_unit = new_unrhdr(0, INT_MAX, NULL);
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sx_init(&backlight_sx, "Backlight sx");
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}
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SYSINIT(backlightdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, backlight_drvinit, NULL);
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MODULE_VERSION(backlight, 1);
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