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/11.1/sys/dev/fb/fbd.c 307589 2016-10-19 01:35:21Z gonzo $
   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/11.1/sys/dev/fb/fbd.c 307589 2016-10-19 01:35:21Z gonzo $");
   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                 if (info->fb_flags & FB_FLAG_MEMATTR)
  182                         *memattr = info->fb_memattr;
  183                 return (0);
  184         }
  185         return (EINVAL);
  186 }
  187 
  188 static int
  189 fb_init(struct fb_list_entry *entry, int unit)
  190 {
  191         struct fb_info *info;
  192 
  193         info = entry->fb_info;
  194         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
  195             0600, "fb%d", unit);
  196         entry->fb_si->si_drv1 = info;
  197         info->fb_cdev = entry->fb_si;
  198 
  199         return (0);
  200 }
  201 
  202 int
  203 fbd_list()
  204 {
  205         struct fb_list_entry *entry;
  206 
  207         if (LIST_EMPTY(&fb_list_head))
  208                 return (ENOENT);
  209 
  210         LIST_FOREACH(entry, &fb_list_head, fb_list) {
  211                 printf("FB %s @%p\n", entry->fb_info->fb_name,
  212                     (void *)entry->fb_info->fb_pbase);
  213         }
  214 
  215         return (0);
  216 }
  217 
  218 static struct fb_list_entry *
  219 fbd_find(struct fb_info* info)
  220 {
  221         struct fb_list_entry *entry, *tmp;
  222 
  223         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  224                 if (entry->fb_info == info) {
  225                         return (entry);
  226                 }
  227         }
  228 
  229         return (NULL);
  230 }
  231 
  232 int
  233 fbd_register(struct fb_info* info)
  234 {
  235         struct fb_list_entry *entry;
  236         int err, first;
  237 
  238         first = 0;
  239         if (LIST_EMPTY(&fb_list_head))
  240                 first++;
  241 
  242         entry = fbd_find(info);
  243         if (entry != NULL) {
  244                 /* XXX Update framebuffer params */
  245                 return (0);
  246         }
  247 
  248         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
  249         entry->fb_info = info;
  250 
  251         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
  252 
  253         err = fb_init(entry, framebuffer_dev_unit++);
  254         if (err)
  255                 return (err);
  256 
  257         if (first) {
  258                 err = vt_fb_attach(info);
  259                 if (err)
  260                         return (err);
  261         }
  262 
  263         return (0);
  264 }
  265 
  266 int
  267 fbd_unregister(struct fb_info* info)
  268 {
  269         struct fb_list_entry *entry, *tmp;
  270 
  271         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  272                 if (entry->fb_info == info) {
  273                         LIST_REMOVE(entry, fb_list);
  274                         if (LIST_EMPTY(&fb_list_head))
  275                                 vt_fb_detach(info);
  276                         free(entry, M_DEVBUF);
  277                         return (0);
  278                 }
  279         }
  280 
  281         return (ENOENT);
  282 }
  283 
  284 static void
  285 register_fb_wrap(void *arg, void *ptr)
  286 {
  287 
  288         fbd_register((struct fb_info *)ptr);
  289 }
  290 
  291 static void
  292 unregister_fb_wrap(void *arg, void *ptr)
  293 {
  294 
  295         fbd_unregister((struct fb_info *)ptr);
  296 }
  297 
  298 static void
  299 fbd_evh_init(void *ctx)
  300 {
  301 
  302         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
  303             EVENTHANDLER_PRI_ANY);
  304         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
  305             EVENTHANDLER_PRI_ANY);
  306 }
  307 
  308 /* Newbus methods. */
  309 static int
  310 fbd_probe(device_t dev)
  311 {
  312 
  313         return (BUS_PROBE_NOWILDCARD);
  314 }
  315 
  316 static int
  317 fbd_attach(device_t dev)
  318 {
  319         struct fbd_softc *sc;
  320         int err;
  321 
  322         sc = device_get_softc(dev);
  323 
  324         sc->sc_dev = dev;
  325         sc->sc_info = FB_GETINFO(device_get_parent(dev));
  326         if (sc->sc_info == NULL)
  327                 return (ENXIO);
  328         err = fbd_register(sc->sc_info);
  329 
  330         return (err);
  331 }
  332 
  333 static int
  334 fbd_detach(device_t dev)
  335 {
  336         struct fbd_softc *sc;
  337         int err;
  338 
  339         sc = device_get_softc(dev);
  340 
  341         err = fbd_unregister(sc->sc_info);
  342 
  343         return (err);
  344 }
  345 
  346 static device_method_t fbd_methods[] = {
  347         /* Device interface */
  348         DEVMETHOD(device_probe,         fbd_probe),
  349         DEVMETHOD(device_attach,        fbd_attach),
  350         DEVMETHOD(device_detach,        fbd_detach),
  351 
  352         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  353 
  354         { 0, 0 }
  355 };
  356 
  357 driver_t fbd_driver = {
  358         "fbd",
  359         fbd_methods,
  360         sizeof(struct fbd_softc)
  361 };
  362 
  363 devclass_t      fbd_devclass;
  364 
  365 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
  366 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
  367 DRIVER_MODULE(fbd, udl, fbd_driver, fbd_devclass, 0, 0);
  368 MODULE_VERSION(fbd, 1);
  369 

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