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/10.1/sys/dev/fb/fbd.c 271769 2014-09-18 14:38:18Z dumbbell $
   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/10.1/sys/dev/fb/fbd.c 271769 2014-09-18 14:38:18Z dumbbell $");
   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 "fb_if.h"
   55 
   56 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
   57     LIST_HEAD_INITIALIZER(fb_list_head);
   58 struct fb_list_entry {
   59         struct fb_info  *fb_info;
   60         struct cdev     *fb_si;
   61         LIST_ENTRY(fb_list_entry) fb_list;
   62 };
   63 
   64 struct fbd_softc {
   65         device_t        sc_dev;
   66         struct fb_info  *sc_info;
   67 };
   68 
   69 static void fbd_evh_init(void *);
   70 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
   71 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
   72 
   73 static d_open_t         fb_open;
   74 static d_close_t        fb_close;
   75 static d_read_t         fb_read;
   76 static d_write_t        fb_write;
   77 static d_ioctl_t        fb_ioctl;
   78 static d_mmap_t         fb_mmap;
   79 
   80 static struct cdevsw fb_cdevsw = {
   81         .d_version =    D_VERSION,
   82         .d_flags =      D_NEEDGIANT,
   83         .d_open =       fb_open,
   84         .d_close =      fb_close,
   85         .d_read =       fb_read,
   86         .d_write =      fb_write,
   87         .d_ioctl =      fb_ioctl,
   88         .d_mmap =       fb_mmap,
   89         .d_name =       "fb",
   90 };
   91 
   92 static int framebuffer_dev_unit = 0;
   93 
   94 static int
   95 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
   96 {
   97 
   98         return (0);
   99 }
  100 
  101 static int
  102 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
  103 {
  104 
  105         return (0);
  106 }
  107 
  108 static int
  109 fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
  110     struct thread *td)
  111 {
  112         struct fb_info *info;
  113         int error;
  114 
  115         error = 0;
  116         info = dev->si_drv1;
  117 
  118         switch (cmd) {
  119         case FBIOGTYPE:
  120                 bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
  121                 break;
  122 
  123         case FBIO_GETWINORG:    /* get frame buffer window origin */
  124                 *(u_int *)data = 0;
  125                 break;
  126 
  127         case FBIO_GETDISPSTART: /* get display start address */
  128                 ((video_display_start_t *)data)->x = 0;
  129                 ((video_display_start_t *)data)->y = 0;
  130                 break;
  131 
  132         case FBIO_GETLINEWIDTH: /* get scan line width in bytes */
  133                 *(u_int *)data = info->fb_stride;
  134                 break;
  135 
  136         case FBIO_BLANK:        /* blank display */
  137                 error = 0;      /* TODO */
  138                 break;
  139 
  140         default:
  141                 error = ENOIOCTL;
  142                 break;
  143         }
  144         return (error);
  145 }
  146 
  147 static int
  148 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
  149 {
  150 
  151         return (0); /* XXX nothing to read, yet */
  152 }
  153 
  154 static int
  155 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
  156 {
  157 
  158         return (0); /* XXX nothing written */
  159 }
  160 
  161 static int
  162 fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
  163     vm_memattr_t *memattr)
  164 {
  165         struct fb_info *info;
  166 
  167         info = dev->si_drv1;
  168 
  169         if ((info->fb_flags & FB_FLAG_NOMMAP) || info->fb_pbase == 0)
  170                 return (ENODEV);
  171 
  172         if (offset < info->fb_size) {
  173                 *paddr = info->fb_pbase + offset;
  174                 return (0);
  175         }
  176         return (EINVAL);
  177 }
  178 
  179 static int
  180 fb_init(struct fb_list_entry *entry, int unit)
  181 {
  182         struct fb_info *info;
  183 
  184         info = entry->fb_info;
  185         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
  186             0600, "fb%d", unit);
  187         entry->fb_si->si_drv1 = info;
  188         info->fb_cdev = entry->fb_si;
  189 
  190         return (0);
  191 }
  192 
  193 int
  194 fbd_list()
  195 {
  196         struct fb_list_entry *entry;
  197 
  198         if (LIST_EMPTY(&fb_list_head))
  199                 return (ENOENT);
  200 
  201         LIST_FOREACH(entry, &fb_list_head, fb_list) {
  202                 printf("FB %s @%p\n", entry->fb_info->fb_name,
  203                     (void *)entry->fb_info->fb_pbase);
  204         }
  205 
  206         return (0);
  207 }
  208 
  209 static struct fb_list_entry *
  210 fbd_find(struct fb_info* info)
  211 {
  212         struct fb_list_entry *entry, *tmp;
  213 
  214         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  215                 if (entry->fb_info == info) {
  216                         return (entry);
  217                 }
  218         }
  219 
  220         return (NULL);
  221 }
  222 
  223 int
  224 fbd_register(struct fb_info* info)
  225 {
  226         struct fb_list_entry *entry;
  227         int err, first;
  228 
  229         first = 0;
  230         if (LIST_EMPTY(&fb_list_head))
  231                 first++;
  232 
  233         entry = fbd_find(info);
  234         if (entry != NULL) {
  235                 /* XXX Update framebuffer params */
  236                 return (0);
  237         }
  238 
  239         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
  240         entry->fb_info = info;
  241 
  242         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
  243 
  244         err = fb_init(entry, framebuffer_dev_unit++);
  245         if (err)
  246                 return (err);
  247 
  248         if (first) {
  249                 err = vt_fb_attach(info);
  250                 if (err)
  251                         return (err);
  252         }
  253 
  254         return (0);
  255 }
  256 
  257 int
  258 fbd_unregister(struct fb_info* info)
  259 {
  260         struct fb_list_entry *entry, *tmp;
  261 
  262         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
  263                 if (entry->fb_info == info) {
  264                         LIST_REMOVE(entry, fb_list);
  265                         free(entry, M_DEVBUF);
  266                         return (0);
  267                 }
  268         }
  269 
  270         return (ENOENT);
  271 }
  272 
  273 static void
  274 register_fb_wrap(void *arg, void *ptr)
  275 {
  276 
  277         fbd_register((struct fb_info *)ptr);
  278 }
  279 
  280 static void
  281 unregister_fb_wrap(void *arg, void *ptr)
  282 {
  283 
  284         fbd_unregister((struct fb_info *)ptr);
  285 }
  286 
  287 static void
  288 fbd_evh_init(void *ctx)
  289 {
  290 
  291         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
  292             EVENTHANDLER_PRI_ANY);
  293         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
  294             EVENTHANDLER_PRI_ANY);
  295 }
  296 
  297 /* Newbus methods. */
  298 static int
  299 fbd_probe(device_t dev)
  300 {
  301 
  302         return (BUS_PROBE_NOWILDCARD);
  303 }
  304 
  305 static int
  306 fbd_attach(device_t dev)
  307 {
  308         struct fbd_softc *sc;
  309         int err;
  310 
  311         sc = device_get_softc(dev);
  312 
  313         sc->sc_dev = dev;
  314         sc->sc_info = FB_GETINFO(device_get_parent(dev));
  315         if (sc->sc_info == NULL)
  316                 return (ENXIO);
  317         err = fbd_register(sc->sc_info);
  318 
  319         return (err);
  320 }
  321 
  322 static int
  323 fbd_detach(device_t dev)
  324 {
  325         struct fbd_softc *sc;
  326         int err;
  327 
  328         sc = device_get_softc(dev);
  329 
  330         err = fbd_unregister(sc->sc_info);
  331 
  332         return (err);
  333 }
  334 
  335 static int
  336 fbd_suspend(device_t dev)
  337 {
  338 
  339         vt_fb_suspend();
  340         return (bus_generic_suspend(dev));
  341 }
  342 
  343 static int
  344 fbd_resume(device_t dev)
  345 {
  346 
  347         vt_fb_resume();
  348         return (bus_generic_resume(dev));
  349 }
  350 
  351 static device_method_t fbd_methods[] = {
  352         /* Device interface */
  353         DEVMETHOD(device_probe,         fbd_probe),
  354         DEVMETHOD(device_attach,        fbd_attach),
  355         DEVMETHOD(device_detach,        fbd_detach),
  356 
  357         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  358         DEVMETHOD(device_suspend,       fbd_suspend),
  359         DEVMETHOD(device_resume,        fbd_resume),
  360 
  361         { 0, 0 }
  362 };
  363 
  364 driver_t fbd_driver = {
  365         "fbd",
  366         fbd_methods,
  367         sizeof(struct fbd_softc)
  368 };
  369 
  370 devclass_t      fbd_devclass;
  371 
  372 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
  373 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
  374 MODULE_VERSION(fbd, 1);
  375 

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