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