fbd.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed by Aleksandr Rybalko under sponsorship from the
    8  * FreeBSD Foundation.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD$
   32  */
   33 
   34 /* Generic framebuffer */
   35 /* TODO unlink from VT(9) */
   36 /* TODO done normal /dev/fb methods */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/bus.h>
   44 #include <sys/conf.h>
   45 #include <sys/kernel.h>
   46 #include <sys/malloc.h>
   47 #include <sys/module.h>
   48 #include <sys/queue.h>
   49 #include <sys/fbio.h>
   50 
   51 #include <machine/bus.h>
   52 
   53 #include <dev/vt/vt.h>
   54 #include <dev/vt/hw/fb/vt_fb.h>
   55 
   56 #include <vm/vm.h>
   57 #include <vm/pmap.h>
   58 
   59 #include "fb_if.h"
   60 
   61 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
   62     LIST_HEAD_INITIALIZER(fb_list_head);
   63 struct fb_list_entry {
   64         struct fb_info  *fb_info;
   65         struct cdev     *fb_si;
   66         LIST_ENTRY(fb_list_entry) fb_list;
   67 };
   68 
   69 struct fbd_softc {
   70         device_t        sc_dev;
   71         struct fb_info  *sc_info;
   72 };
   73 
   74 static void fbd_evh_init(void *);
   75 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
   76 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
   77 
   78 static d_open_t         fb_open;
   79 static d_close_t        fb_close;
   80 static d_read_t         fb_read;
   81 static d_write_t        fb_write;
   82 static d_ioctl_t        fb_ioctl;
   83 static d_mmap_t         fb_mmap;
   84 
   85 static struct cdevsw fb_cdevsw = {
   86         .d_version =    D_VERSION,
   87         .d_flags =      D_NEEDGIANT,
   88         .d_open =       fb_open,
   89         .d_close =      fb_close,
   90         .d_read =       fb_read,
   91         .d_write =      fb_write,
   92         .d_ioctl =      fb_ioctl,
   93         .d_mmap =       fb_mmap,
   94         .d_name =       "fb",
   95 };
   96 
   97 static int framebuffer_dev_unit = 0;
   98 
   99 static int
  100 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
  101 {
  102 
  103         return (0);
  104 }
  105 
  106 static int
  107 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
  108 {
  109 
  110         return (0);
  111 }
  112 
  113 static int
  114 fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
  115     struct thread *td)
  116 {
  117         struct fb_info *info;
  118         int error;
  119 
  120         error = 0;
  121         info = dev->si_drv1;
  122 
  123         switch (cmd) {
  124         case FBIOGTYPE:
  125                 bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
  126                 break;
  127 
  128         case FBIO_GETWINORG:    /* get frame buffer window origin */
  129                 *(u_int *)data = 0;
  130                 break;
  131 
  132         case FBIO_GETDISPSTART: /* get display start address */
  133                 ((video_display_start_t *)data)->x = 0;
  134                 ((video_display_start_t *)data)->y = 0;
  135                 break;
  136 
  137         case FBIO_GETLINEWIDTH: /* get scan line width in bytes */
  138                 *(u_int *)data = info->fb_stride;
  139                 break;
  140 
  141         case FBIO_BLANK:        /* blank display */
  142                 if (info->setblankmode != NULL)
  143                         error = info->setblankmode(info->fb_priv, *(int *)data);
  144                 break;
  145 
  146         default:
  147                 error = ENOIOCTL;
  148                 break;
  149         }
  150         return (error);
  151 }
  152 
  153 static int
  154 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
  155 {
  156 
  157         return (0); /* XXX nothing to read, yet */
  158 }
  159 
  160 static int
  161 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
  162 {
  163 
  164         return (0); /* XXX nothing written */
  165 }
  166 
  167 static int
  168 fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
  169     vm_memattr_t *memattr)
  170 {
  171         struct fb_info *info;
  172 
  173         info = dev->si_drv1;
  174 
  175         if (info->fb_flags & FB_FLAG_NOMMAP)
  176                 return (ENODEV);
  177 
  178         if (offset >= 0 && offset < info->fb_size) {
  179                 if (info->fb_pbase == 0)
  180                         *paddr = vtophys((uint8_t *)info->fb_vbase + offset);
  181                 else
  182                         *paddr = info->fb_pbase + offset;
  183                 if (info->fb_flags & FB_FLAG_MEMATTR)
  184                         *memattr = info->fb_memattr;
  185                 return (0);
  186         }
  187         return (EINVAL);
  188 }
  189 
  190 static int
  191 fb_init(struct fb_list_entry *entry, int unit)
  192 {
  193         struct fb_info *info;
  194 
  195         info = entry->fb_info;
  196         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
  197             0600, "fb%d", unit);
  198         entry->fb_si->si_drv1 = info;
  199         info->fb_cdev = entry->fb_si;
  200 
  201         return (0);
  202 }
  203 
  204 int
  205 fbd_list(void)
  206 {
  207         struct fb_list_entry *entry;
  208 
  209         if (LIST_EMPTY(&fb_list_head))
  210                 return (ENOENT);
  211 
  212         LIST_FOREACH(entry, &fb_list_head, fb_list) {
  213                 printf("FB %s @%p\n", entry->fb_info->fb_name,
  214                     (void *)entry->fb_info->fb_pbase);
  215         }
  216 
  217         return (0);
  218 }
  219 
  220 static struct fb_list_entry *
  221 fbd_find(struct fb_info* info)
  222 {
  223         struct fb_list_entry *entry, *tmp;
  224 
  225         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  226                 if (entry->fb_info == info) {
  227                         return (entry);
  228                 }
  229         }
  230 
  231         return (NULL);
  232 }
  233 
  234 int
  235 fbd_register(struct fb_info* info)
  236 {
  237         struct fb_list_entry *entry;
  238         int err, first;
  239 
  240         first = 0;
  241         if (LIST_EMPTY(&fb_list_head))
  242                 first++;
  243 
  244         entry = fbd_find(info);
  245         if (entry != NULL) {
  246                 /* XXX Update framebuffer params */
  247                 return (0);
  248         }
  249 
  250         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
  251         entry->fb_info = info;
  252 
  253         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
  254 
  255         err = fb_init(entry, framebuffer_dev_unit++);
  256         if (err)
  257                 return (err);
  258 
  259         if (first) {
  260                 err = vt_fb_attach(info);
  261                 if (err)
  262                         return (err);
  263         }
  264 
  265         return (0);
  266 }
  267 
  268 int
  269 fbd_unregister(struct fb_info* info)
  270 {
  271         struct fb_list_entry *entry, *tmp;
  272 
  273         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  274                 if (entry->fb_info == info) {
  275                         LIST_REMOVE(entry, fb_list);
  276                         if (LIST_EMPTY(&fb_list_head))
  277                                 vt_fb_detach(info);
  278                         free(entry, M_DEVBUF);
  279                         return (0);
  280                 }
  281         }
  282 
  283         return (ENOENT);
  284 }
  285 
  286 static void
  287 register_fb_wrap(void *arg, void *ptr)
  288 {
  289 
  290         fbd_register((struct fb_info *)ptr);
  291 }
  292 
  293 static void
  294 unregister_fb_wrap(void *arg, void *ptr)
  295 {
  296 
  297         fbd_unregister((struct fb_info *)ptr);
  298 }
  299 
  300 static void
  301 fbd_evh_init(void *ctx)
  302 {
  303 
  304         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
  305             EVENTHANDLER_PRI_ANY);
  306         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
  307             EVENTHANDLER_PRI_ANY);
  308 }
  309 
  310 /* Newbus methods. */
  311 static int
  312 fbd_probe(device_t dev)
  313 {
  314 
  315         return (BUS_PROBE_NOWILDCARD);
  316 }
  317 
  318 static int
  319 fbd_attach(device_t dev)
  320 {
  321         struct fbd_softc *sc;
  322         int err;
  323 
  324         sc = device_get_softc(dev);
  325 
  326         sc->sc_dev = dev;
  327         sc->sc_info = FB_GETINFO(device_get_parent(dev));
  328         if (sc->sc_info == NULL)
  329                 return (ENXIO);
  330         err = fbd_register(sc->sc_info);
  331 
  332         return (err);
  333 }
  334 
  335 static int
  336 fbd_detach(device_t dev)
  337 {
  338         struct fbd_softc *sc;
  339         int err;
  340 
  341         sc = device_get_softc(dev);
  342 
  343         err = fbd_unregister(sc->sc_info);
  344 
  345         return (err);
  346 }
  347 
  348 static device_method_t fbd_methods[] = {
  349         /* Device interface */
  350         DEVMETHOD(device_probe,         fbd_probe),
  351         DEVMETHOD(device_attach,        fbd_attach),
  352         DEVMETHOD(device_detach,        fbd_detach),
  353 
  354         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  355 
  356         { 0, 0 }
  357 };
  358 
  359 driver_t fbd_driver = {
  360         "fbd",
  361         fbd_methods,
  362         sizeof(struct fbd_softc)
  363 };
  364 
  365 devclass_t      fbd_devclass;
  366 
  367 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
  368 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
  369 DRIVER_MODULE(fbd, udl, fbd_driver, fbd_devclass, 0, 0);
  370 MODULE_VERSION(fbd, 1);
  371
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FreeBSD/Linux Kernel Cross Reference sys/dev/fb/fbd.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/fb/fbd.c
