1*0085a56dSAntonio Huete Jimenez /*-
2*0085a56dSAntonio Huete Jimenez * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3*0085a56dSAntonio Huete Jimenez *
4*0085a56dSAntonio Huete Jimenez * Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
5*0085a56dSAntonio Huete Jimenez *
6*0085a56dSAntonio Huete Jimenez * Redistribution and use in source and binary forms, with or without
7*0085a56dSAntonio Huete Jimenez * modification, are permitted provided that the following conditions
8*0085a56dSAntonio Huete Jimenez * are met:
9*0085a56dSAntonio Huete Jimenez * 1. Redistributions of source code must retain the above copyright
10*0085a56dSAntonio Huete Jimenez * notice, this list of conditions and the following disclaimer.
11*0085a56dSAntonio Huete Jimenez * 2. Redistributions in binary form must reproduce the above copyright
12*0085a56dSAntonio Huete Jimenez * notice, this list of conditions and the following disclaimer in the
13*0085a56dSAntonio Huete Jimenez * documentation and/or other materials provided with the distribution.
14*0085a56dSAntonio Huete Jimenez *
15*0085a56dSAntonio Huete Jimenez * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16*0085a56dSAntonio Huete Jimenez * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17*0085a56dSAntonio Huete Jimenez * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18*0085a56dSAntonio Huete Jimenez * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19*0085a56dSAntonio Huete Jimenez * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20*0085a56dSAntonio Huete Jimenez * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21*0085a56dSAntonio Huete Jimenez * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22*0085a56dSAntonio Huete Jimenez * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23*0085a56dSAntonio Huete Jimenez * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24*0085a56dSAntonio Huete Jimenez * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25*0085a56dSAntonio Huete Jimenez * SUCH DAMAGE.
26*0085a56dSAntonio Huete Jimenez *
27*0085a56dSAntonio Huete Jimenez * $FreeBSD$
28*0085a56dSAntonio Huete Jimenez */
29*0085a56dSAntonio Huete Jimenez
30*0085a56dSAntonio Huete Jimenez #include <sys/param.h>
31*0085a56dSAntonio Huete Jimenez #include <sys/systm.h>
32*0085a56dSAntonio Huete Jimenez #include <sys/limits.h>
33*0085a56dSAntonio Huete Jimenez #include <sys/bus.h>
34*0085a56dSAntonio Huete Jimenez #include <sys/conf.h>
35*0085a56dSAntonio Huete Jimenez #include <sys/device.h>
36*0085a56dSAntonio Huete Jimenez #include <sys/kernel.h>
37*0085a56dSAntonio Huete Jimenez #include <sys/malloc.h>
38*0085a56dSAntonio Huete Jimenez #include <sys/module.h>
39*0085a56dSAntonio Huete Jimenez #include <sys/lock.h>
40*0085a56dSAntonio Huete Jimenez
41*0085a56dSAntonio Huete Jimenez #include <dev/misc/backlight/backlight.h>
42*0085a56dSAntonio Huete Jimenez
43*0085a56dSAntonio Huete Jimenez #include "backlight_if.h"
44*0085a56dSAntonio Huete Jimenez
45*0085a56dSAntonio Huete Jimenez static struct lock backlight_lock;
46*0085a56dSAntonio Huete Jimenez static MALLOC_DEFINE(M_BACKLIGHT, "BACKLIGHT", "Backlight driver");
47*0085a56dSAntonio Huete Jimenez static struct unrhdr *backlight_unit;
48*0085a56dSAntonio Huete Jimenez
49*0085a56dSAntonio Huete Jimenez struct backlight_softc {
50*0085a56dSAntonio Huete Jimenez struct cdev *cdev;
51*0085a56dSAntonio Huete Jimenez struct cdev *alias;
52*0085a56dSAntonio Huete Jimenez int unit;
53*0085a56dSAntonio Huete Jimenez device_t dev;
54*0085a56dSAntonio Huete Jimenez uint32_t cached_brightness;
55*0085a56dSAntonio Huete Jimenez };
56*0085a56dSAntonio Huete Jimenez
57*0085a56dSAntonio Huete Jimenez static int
backlight_ioctl(struct dev_ioctl_args * ap)58*0085a56dSAntonio Huete Jimenez backlight_ioctl(struct dev_ioctl_args *ap)
59*0085a56dSAntonio Huete Jimenez {
60*0085a56dSAntonio Huete Jimenez struct backlight_softc *sc;
61*0085a56dSAntonio Huete Jimenez struct backlight_props props;
62*0085a56dSAntonio Huete Jimenez struct backlight_info info;
63*0085a56dSAntonio Huete Jimenez cdev_t dev = ap->a_head.a_dev;
64*0085a56dSAntonio Huete Jimenez int error = 0;
65*0085a56dSAntonio Huete Jimenez
66*0085a56dSAntonio Huete Jimenez sc = dev->si_drv1;
67*0085a56dSAntonio Huete Jimenez
68*0085a56dSAntonio Huete Jimenez switch (ap->a_cmd) {
69*0085a56dSAntonio Huete Jimenez case BACKLIGHTGETSTATUS:
70*0085a56dSAntonio Huete Jimenez /* Call the driver function so it fills up the props */
71*0085a56dSAntonio Huete Jimenez bcopy(ap->a_data, &props, sizeof(struct backlight_props));
72*0085a56dSAntonio Huete Jimenez error = BACKLIGHT_GET_STATUS(sc->dev, &props);
73*0085a56dSAntonio Huete Jimenez if (error == 0) {
74*0085a56dSAntonio Huete Jimenez bcopy(&props, ap->a_data, sizeof(struct backlight_props));
75*0085a56dSAntonio Huete Jimenez sc->cached_brightness = props.brightness;
76*0085a56dSAntonio Huete Jimenez }
77*0085a56dSAntonio Huete Jimenez break;
78*0085a56dSAntonio Huete Jimenez case BACKLIGHTUPDATESTATUS:
79*0085a56dSAntonio Huete Jimenez bcopy(ap->a_data, &props, sizeof(struct backlight_props));
80*0085a56dSAntonio Huete Jimenez if (props.brightness == sc->cached_brightness)
81*0085a56dSAntonio Huete Jimenez return (0);
82*0085a56dSAntonio Huete Jimenez error = BACKLIGHT_UPDATE_STATUS(sc->dev, &props);
83*0085a56dSAntonio Huete Jimenez if (error == 0) {
84*0085a56dSAntonio Huete Jimenez bcopy(&props, ap->a_data, sizeof(struct backlight_props));
85*0085a56dSAntonio Huete Jimenez sc->cached_brightness = props.brightness;
86*0085a56dSAntonio Huete Jimenez }
87*0085a56dSAntonio Huete Jimenez break;
88*0085a56dSAntonio Huete Jimenez case BACKLIGHTGETINFO:
89*0085a56dSAntonio Huete Jimenez memset(&info, 0, sizeof(info));
90*0085a56dSAntonio Huete Jimenez error = BACKLIGHT_GET_INFO(sc->dev, &info);
91*0085a56dSAntonio Huete Jimenez if (error == 0)
92*0085a56dSAntonio Huete Jimenez bcopy(&info, ap->a_data, sizeof(struct backlight_info));
93*0085a56dSAntonio Huete Jimenez break;
94*0085a56dSAntonio Huete Jimenez }
95*0085a56dSAntonio Huete Jimenez
96*0085a56dSAntonio Huete Jimenez return (error);
97*0085a56dSAntonio Huete Jimenez }
98*0085a56dSAntonio Huete Jimenez
99*0085a56dSAntonio Huete Jimenez static struct dev_ops backlight_cdevsw = {
100*0085a56dSAntonio Huete Jimenez .head = { .name = "backlight", .flags = D_MPSAFE },
101*0085a56dSAntonio Huete Jimenez .d_ioctl = backlight_ioctl,
102*0085a56dSAntonio Huete Jimenez };
103*0085a56dSAntonio Huete Jimenez
104*0085a56dSAntonio Huete Jimenez struct cdev *
backlight_register(const char * name,device_t dev)105*0085a56dSAntonio Huete Jimenez backlight_register(const char *name, device_t dev)
106*0085a56dSAntonio Huete Jimenez {
107*0085a56dSAntonio Huete Jimenez struct backlight_softc *sc;
108*0085a56dSAntonio Huete Jimenez struct backlight_props props;
109*0085a56dSAntonio Huete Jimenez int error;
110*0085a56dSAntonio Huete Jimenez
111*0085a56dSAntonio Huete Jimenez sc = kmalloc(sizeof(*sc), M_BACKLIGHT, M_WAITOK | M_ZERO);
112*0085a56dSAntonio Huete Jimenez
113*0085a56dSAntonio Huete Jimenez lockmgr(&backlight_lock, LK_EXCLUSIVE);
114*0085a56dSAntonio Huete Jimenez sc->unit = alloc_unr(backlight_unit);
115*0085a56dSAntonio Huete Jimenez sc->dev = dev;
116*0085a56dSAntonio Huete Jimenez make_dev(&backlight_cdevsw, sc->unit, UID_ROOT, GID_VIDEO,
117*0085a56dSAntonio Huete Jimenez 0660, "backlight/backlight%d", sc->unit);
118*0085a56dSAntonio Huete Jimenez sc->cdev->si_drv1 = sc;
119*0085a56dSAntonio Huete Jimenez make_dev_alias(sc->cdev, "backlight/%s%d", name, sc->unit);
120*0085a56dSAntonio Huete Jimenez
121*0085a56dSAntonio Huete Jimenez lockmgr(&backlight_lock, LK_RELEASE);
122*0085a56dSAntonio Huete Jimenez
123*0085a56dSAntonio Huete Jimenez error = BACKLIGHT_GET_STATUS(sc->dev, &props);
124*0085a56dSAntonio Huete Jimenez sc->cached_brightness = props.brightness;
125*0085a56dSAntonio Huete Jimenez
126*0085a56dSAntonio Huete Jimenez return (sc->cdev);
127*0085a56dSAntonio Huete Jimenez }
128*0085a56dSAntonio Huete Jimenez
129*0085a56dSAntonio Huete Jimenez int
backlight_destroy(struct cdev * dev)130*0085a56dSAntonio Huete Jimenez backlight_destroy(struct cdev *dev)
131*0085a56dSAntonio Huete Jimenez {
132*0085a56dSAntonio Huete Jimenez struct backlight_softc *sc;
133*0085a56dSAntonio Huete Jimenez
134*0085a56dSAntonio Huete Jimenez sc = dev->si_drv1;
135*0085a56dSAntonio Huete Jimenez lockmgr(&backlight_lock, LK_EXCLUSIVE);
136*0085a56dSAntonio Huete Jimenez free_unr(backlight_unit, sc->unit);
137*0085a56dSAntonio Huete Jimenez destroy_dev(dev);
138*0085a56dSAntonio Huete Jimenez lockmgr(&backlight_lock, LK_RELEASE);
139*0085a56dSAntonio Huete Jimenez return (0);
140*0085a56dSAntonio Huete Jimenez }
141*0085a56dSAntonio Huete Jimenez
142*0085a56dSAntonio Huete Jimenez static void
backlight_drvinit(void * unused)143*0085a56dSAntonio Huete Jimenez backlight_drvinit(void *unused)
144*0085a56dSAntonio Huete Jimenez {
145*0085a56dSAntonio Huete Jimenez
146*0085a56dSAntonio Huete Jimenez backlight_unit = new_unrhdr(0, INT_MAX, NULL);
147*0085a56dSAntonio Huete Jimenez lockuninit(&backlight_lock);
148*0085a56dSAntonio Huete Jimenez }
149*0085a56dSAntonio Huete Jimenez
150*0085a56dSAntonio Huete Jimenez SYSINIT(backlightdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, backlight_drvinit, NULL);
151*0085a56dSAntonio Huete Jimenez MODULE_VERSION(backlight, 1);
152