The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2013 The FreeBSD Foundation
    3  * All rights reserved.
    4  *
    5  * This software was developed by Aleksandr Rybalko under sponsorship from the
    6  * FreeBSD Foundation.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/11.0/sys/dev/fb/fbd.c 279752 2015-03-07 20:45:15Z hselasky $
   30  */
   31 
   32 /* Generic framebuffer */
   33 /* TODO unlink from VT(9) */
   34 /* TODO done normal /dev/fb methods */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/11.0/sys/dev/fb/fbd.c 279752 2015-03-07 20:45:15Z hselasky $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/bus.h>
   42 #include <sys/conf.h>
   43 #include <sys/kernel.h>
   44 #include <sys/malloc.h>
   45 #include <sys/module.h>
   46 #include <sys/queue.h>
   47 #include <sys/fbio.h>
   48 
   49 #include <machine/bus.h>
   50 
   51 #include <dev/vt/vt.h>
   52 #include <dev/vt/hw/fb/vt_fb.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/pmap.h>
   56 
   57 #include "fb_if.h"
   58 
   59 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
   60     LIST_HEAD_INITIALIZER(fb_list_head);
   61 struct fb_list_entry {
   62         struct fb_info  *fb_info;
   63         struct cdev     *fb_si;
   64         LIST_ENTRY(fb_list_entry) fb_list;
   65 };
   66 
   67 struct fbd_softc {
   68         device_t        sc_dev;
   69         struct fb_info  *sc_info;
   70 };
   71 
   72 static void fbd_evh_init(void *);
   73 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
   74 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
   75 
   76 static d_open_t         fb_open;
   77 static d_close_t        fb_close;
   78 static d_read_t         fb_read;
   79 static d_write_t        fb_write;
   80 static d_ioctl_t        fb_ioctl;
   81 static d_mmap_t         fb_mmap;
   82 
   83 static struct cdevsw fb_cdevsw = {
   84         .d_version =    D_VERSION,
   85         .d_flags =      D_NEEDGIANT,
   86         .d_open =       fb_open,
   87         .d_close =      fb_close,
   88         .d_read =       fb_read,
   89         .d_write =      fb_write,
   90         .d_ioctl =      fb_ioctl,
   91         .d_mmap =       fb_mmap,
   92         .d_name =       "fb",
   93 };
   94 
   95 static int framebuffer_dev_unit = 0;
   96 
   97 static int
   98 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
   99 {
  100 
  101         return (0);
  102 }
  103 
  104 static int
  105 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
  106 {
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
  113     struct thread *td)
  114 {
  115         struct fb_info *info;
  116         int error;
  117 
  118         error = 0;
  119         info = dev->si_drv1;
  120 
  121         switch (cmd) {
  122         case FBIOGTYPE:
  123                 bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
  124                 break;
  125 
  126         case FBIO_GETWINORG:    /* get frame buffer window origin */
  127                 *(u_int *)data = 0;
  128                 break;
  129 
  130         case FBIO_GETDISPSTART: /* get display start address */
  131                 ((video_display_start_t *)data)->x = 0;
  132                 ((video_display_start_t *)data)->y = 0;
  133                 break;
  134 
  135         case FBIO_GETLINEWIDTH: /* get scan line width in bytes */
  136                 *(u_int *)data = info->fb_stride;
  137                 break;
  138 
  139         case FBIO_BLANK:        /* blank display */
  140                 if (info->setblankmode != NULL)
  141                         error = info->setblankmode(info->fb_priv, *(int *)data);
  142                 break;
  143 
  144         default:
  145                 error = ENOIOCTL;
  146                 break;
  147         }
  148         return (error);
  149 }
  150 
  151 static int
  152 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
  153 {
  154 
  155         return (0); /* XXX nothing to read, yet */
  156 }
  157 
  158 static int
  159 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
  160 {
  161 
  162         return (0); /* XXX nothing written */
  163 }
  164 
  165 static int
  166 fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
  167     vm_memattr_t *memattr)
  168 {
  169         struct fb_info *info;
  170 
  171         info = dev->si_drv1;
  172 
  173         if (info->fb_flags & FB_FLAG_NOMMAP)
  174                 return (ENODEV);
  175 
  176         if (offset >= 0 && offset < info->fb_size) {
  177                 if (info->fb_pbase == 0)
  178                         *paddr = vtophys((uint8_t *)info->fb_vbase + offset);
  179                 else
  180                         *paddr = info->fb_pbase + offset;
  181                 return (0);
  182         }
  183         return (EINVAL);
  184 }
  185 
  186 static int
  187 fb_init(struct fb_list_entry *entry, int unit)
  188 {
  189         struct fb_info *info;
  190 
  191         info = entry->fb_info;
  192         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
  193             0600, "fb%d", unit);
  194         entry->fb_si->si_drv1 = info;
  195         info->fb_cdev = entry->fb_si;
  196 
  197         return (0);
  198 }
  199 
  200 int
  201 fbd_list()
  202 {
  203         struct fb_list_entry *entry;
  204 
  205         if (LIST_EMPTY(&fb_list_head))
  206                 return (ENOENT);
  207 
  208         LIST_FOREACH(entry, &fb_list_head, fb_list) {
  209                 printf("FB %s @%p\n", entry->fb_info->fb_name,
  210                     (void *)entry->fb_info->fb_pbase);
  211         }
  212 
  213         return (0);
  214 }
  215 
  216 static struct fb_list_entry *
  217 fbd_find(struct fb_info* info)
  218 {
  219         struct fb_list_entry *entry, *tmp;
  220 
  221         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  222                 if (entry->fb_info == info) {
  223                         return (entry);
  224                 }
  225         }
  226 
  227         return (NULL);
  228 }
  229 
  230 int
  231 fbd_register(struct fb_info* info)
  232 {
  233         struct fb_list_entry *entry;
  234         int err, first;
  235 
  236         first = 0;
  237         if (LIST_EMPTY(&fb_list_head))
  238                 first++;
  239 
  240         entry = fbd_find(info);
  241         if (entry != NULL) {
  242                 /* XXX Update framebuffer params */
  243                 return (0);
  244         }
  245 
  246         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
  247         entry->fb_info = info;
  248 
  249         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
  250 
  251         err = fb_init(entry, framebuffer_dev_unit++);
  252         if (err)
  253                 return (err);
  254 
  255         if (first) {
  256                 err = vt_fb_attach(info);
  257                 if (err)
  258                         return (err);
  259         }
  260 
  261         return (0);
  262 }
  263 
  264 int
  265 fbd_unregister(struct fb_info* info)
  266 {
  267         struct fb_list_entry *entry, *tmp;
  268 
  269         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  270                 if (entry->fb_info == info) {
  271                         LIST_REMOVE(entry, fb_list);
  272                         if (LIST_EMPTY(&fb_list_head))
  273                                 vt_fb_detach(info);
  274                         free(entry, M_DEVBUF);
  275                         return (0);
  276                 }
  277         }
  278 
  279         return (ENOENT);
  280 }
  281 
  282 static void
  283 register_fb_wrap(void *arg, void *ptr)
  284 {
  285 
  286         fbd_register((struct fb_info *)ptr);
  287 }
  288 
  289 static void
  290 unregister_fb_wrap(void *arg, void *ptr)
  291 {
  292 
  293         fbd_unregister((struct fb_info *)ptr);
  294 }
  295 
  296 static void
  297 fbd_evh_init(void *ctx)
  298 {
  299 
  300         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
  301             EVENTHANDLER_PRI_ANY);
  302         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
  303             EVENTHANDLER_PRI_ANY);
  304 }
  305 
  306 /* Newbus methods. */
  307 static int
  308 fbd_probe(device_t dev)
  309 {
  310 
  311         return (BUS_PROBE_NOWILDCARD);
  312 }
  313 
  314 static int
  315 fbd_attach(device_t dev)
  316 {
  317         struct fbd_softc *sc;
  318         int err;
  319 
  320         sc = device_get_softc(dev);
  321 
  322         sc->sc_dev = dev;
  323         sc->sc_info = FB_GETINFO(device_get_parent(dev));
  324         if (sc->sc_info == NULL)
  325                 return (ENXIO);
  326         err = fbd_register(sc->sc_info);
  327 
  328         return (err);
  329 }
  330 
  331 static int
  332 fbd_detach(device_t dev)
  333 {
  334         struct fbd_softc *sc;
  335         int err;
  336 
  337         sc = device_get_softc(dev);
  338 
  339         err = fbd_unregister(sc->sc_info);
  340 
  341         return (err);
  342 }
  343 
  344 static device_method_t fbd_methods[] = {
  345         /* Device interface */
  346         DEVMETHOD(device_probe,         fbd_probe),
  347         DEVMETHOD(device_attach,        fbd_attach),
  348         DEVMETHOD(device_detach,        fbd_detach),
  349 
  350         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  351 
  352         { 0, 0 }
  353 };
  354 
  355 driver_t fbd_driver = {
  356         "fbd",
  357         fbd_methods,
  358         sizeof(struct fbd_softc)
  359 };
  360 
  361 devclass_t      fbd_devclass;
  362 
  363 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
  364 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
  365 DRIVER_MODULE(fbd, udl, fbd_driver, fbd_devclass, 0, 0);
  366 MODULE_VERSION(fbd, 1);
  367 

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