src/compositor-fbdev.c

   1 /*
   2  * Copyright © 2008-2011 Kristian Høgsberg
   3  * Copyright © 2011 Intel Corporation
   4  * Copyright © 2012 Raspberry Pi Foundation
   5  * Copyright © 2013 Philip Withnall
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that the above copyright notice appear in all copies and that both that
  10  * copyright notice and this permission notice appear in supporting
  11  * documentation, and that the name of the copyright holders not be used in
  12  * advertising or publicity pertaining to distribution of the software
  13  * without specific, written prior permission.  The copyright holders make
  14  * no representations about the suitability of this software for any
  15  * purpose.  It is provided "as is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  18  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  19  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  20  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  21  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  22  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  23  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  24  */
  25
  26 #define _GNU_SOURCE
  27
  28 #include <errno.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <math.h>
  33 #include <sys/mman.h>
  34 #include <sys/types.h>
  35 #include <fcntl.h>
  36 #include <unistd.h>
  37 #include <linux/fb.h>
  38 #include <linux/input.h>
  39
  40 #include <libudev.h>
  41
  42 #include "config.h"
  43
  44 #include "compositor.h"
  45 #include "launcher-util.h"
  46 #include "pixman-renderer.h"
  47 #include "udev-seat.h"
  48
  49 struct fbdev_compositor {
  50         struct weston_compositor base;
  51         uint32_t prev_state;
  52
  53         struct udev *udev;
  54         struct tty *tty;
  55 };
  56
  57 struct fbdev_screeninfo {
  58         unsigned int x_resolution; /* pixels, visible area */
  59         unsigned int y_resolution; /* pixels, visible area */
  60         unsigned int width_mm; /* visible screen width in mm */
  61         unsigned int height_mm; /* visible screen height in mm */
  62         unsigned int bits_per_pixel;
  63
  64         size_t buffer_length; /* length of frame buffer memory in bytes */
  65         size_t line_length; /* length of a line in bytes */
  66         char id[16]; /* screen identifier */
  67
  68         pixman_format_code_t pixel_format; /* frame buffer pixel format */
  69         unsigned int refresh_rate; /* Hertz */
  70 };
  71
  72 struct fbdev_output {
  73         struct fbdev_compositor *compositor;
  74         struct weston_output base;
  75
  76         struct weston_mode mode;
  77         struct wl_event_source *finish_frame_timer;
  78
  79         /* Frame buffer details. */
  80         const char *device; /* ownership shared with fbdev_parameters */
  81         struct fbdev_screeninfo fb_info;
  82         void *fb; /* length is fb_info.buffer_length */
  83
  84         /* pixman details. */
  85         pixman_image_t *hw_surface;
  86         pixman_image_t *shadow_surface;
  87         void *shadow_buf;
  88         uint8_t depth;
  89 };
  90
  91 struct fbdev_seat {
  92         struct weston_seat base;
  93         struct wl_list devices_list;
  94
  95         struct udev_monitor *udev_monitor;
  96         struct wl_event_source *udev_monitor_source;
  97         char *seat_id;
  98 };
  99
 100 struct fbdev_parameters {
 101         int tty;
 102         char *device;
 103 };
 104
 105 static const char default_seat[] = "seat0";
 106
 107 static inline struct fbdev_output *
 108 to_fbdev_output(struct weston_output *base)
 109 {
 110         return container_of(base, struct fbdev_output, base);
 111 }
 112
 113 static inline struct fbdev_seat *
 114 to_fbdev_seat(struct weston_seat *base)
 115 {
 116         return container_of(base, struct fbdev_seat, base);
 117 }
 118
 119 static inline struct fbdev_compositor *
 120 to_fbdev_compositor(struct weston_compositor *base)
 121 {
 122         return container_of(base, struct fbdev_compositor, base);
 123 }
 124
 125 static void
 126 fbdev_output_repaint(struct weston_output *base, pixman_region32_t *damage)
 127 {
 128         struct fbdev_output *output = to_fbdev_output(base);
 129         struct weston_compositor *ec = output->base.compositor;
 130         pixman_box32_t *rects;
 131         int nrects, i, src_x, src_y, x1, y1, x2, y2, width, height;
 132
 133         /* Repaint the damaged region onto the back buffer. */
 134         pixman_renderer_output_set_buffer(base, output->shadow_surface);
 135         ec->renderer->repaint_output(base, damage);
 136
 137         /* Transform and composite onto the frame buffer. */
 138         width = pixman_image_get_width(output->shadow_surface);
 139         height = pixman_image_get_height(output->shadow_surface);
 140         rects = pixman_region32_rectangles(damage, &nrects);
 141
 142         for (i = 0; i < nrects; i++) {
 143                 switch (base->transform) {
 144                 default:
 145                 case WL_OUTPUT_TRANSFORM_NORMAL:
 146                         x1 = rects[i].x1;
 147                         x2 = rects[i].x2;
 148                         y1 = rects[i].y1;
 149                         y2 = rects[i].y2;
 150                         break;
 151                 case WL_OUTPUT_TRANSFORM_180:
 152                         x1 = width - rects[i].x2;
 153                         x2 = width - rects[i].x1;
 154                         y1 = height - rects[i].y2;
 155                         y2 = height - rects[i].y1;
 156                         break;
 157                 case WL_OUTPUT_TRANSFORM_90:
 158                         x1 = height - rects[i].y2;
 159                         x2 = height - rects[i].y1;
 160                         y1 = rects[i].x1;
 161                         y2 = rects[i].x2;
 162                         break;
 163                 case WL_OUTPUT_TRANSFORM_270:
 164                         x1 = rects[i].y1;
 165                         x2 = rects[i].y2;
 166                         y1 = width - rects[i].x2;
 167                         y2 = width - rects[i].x1;
 168                         break;
 169                 }
 170                 src_x = x1;
 171                 src_y = y1;
 172
 173                 pixman_image_composite32(PIXMAN_OP_SRC,
 174                         output->shadow_surface, /* src */
 175                         NULL /* mask */,
 176                         output->hw_surface, /* dest */
 177                         src_x, src_y, /* src_x, src_y */
 178                         0, 0, /* mask_x, mask_y */
 179                         x1, y1, /* dest_x, dest_y */
 180                         x2 - x1, /* width */
 181                         y2 - y1 /* height */);
 182         }
 183
 184         /* Update the damage region. */
 185         pixman_region32_subtract(&ec->primary_plane.damage,
 186                                  &ec->primary_plane.damage, damage);
 187
 188         /* Schedule the end of the frame. We do not sync this to the frame
 189          * buffer clock because users who want that should be using the DRM
 190          * compositor. FBIO_WAITFORVSYNC blocks and FB_ACTIVATE_VBL requires
 191          * panning, which is broken in most kernel drivers.
 192          *
 193          * Finish the frame synchronised to the specified refresh rate. The
 194          * refresh rate is given in mHz and the interval in ms. */
 195         wl_event_source_timer_update(output->finish_frame_timer,
 196                                      1000000 / output->mode.refresh);
 197 }
 198
 199 static int
 200 finish_frame_handler(void *data)
 201 {
 202         struct fbdev_output *output = data;
 203         uint32_t msec;
 204         struct timeval tv;
 205
 206         gettimeofday(&tv, NULL);
 207         msec = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 208         weston_output_finish_frame(&output->base, msec);
 209
 210         return 1;
 211 }
 212
 213 static pixman_format_code_t
 214 calculate_pixman_format(struct fb_var_screeninfo *vinfo,
 215                         struct fb_fix_screeninfo *finfo)
 216 {
 217         /* Calculate the pixman format supported by the frame buffer from the
 218          * buffer's metadata. Return 0 if no known pixman format is supported
 219          * (since this has depth 0 it's guaranteed to not conflict with any
 220          * actual pixman format).
 221          *
 222          * Documentation on the vinfo and finfo structures:
 223          *    http://www.mjmwired.net/kernel/Documentation/fb/api.txt
 224          *
 225          * TODO: Try a bit harder to support other formats, including setting
 226          * the preferred format in the hardware. */
 227         int type;
 228
 229         weston_log("Calculating pixman format from:\n"
 230                    STAMP_SPACE " - type: %i (aux: %i)\n"
 231                    STAMP_SPACE " - visual: %i\n"
 232                    STAMP_SPACE " - bpp: %i (grayscale: %i)\n"
 233                    STAMP_SPACE " - red: offset: %i, length: %i, MSB: %i\n"
 234                    STAMP_SPACE " - green: offset: %i, length: %i, MSB: %i\n"
 235                    STAMP_SPACE " - blue: offset: %i, length: %i, MSB: %i\n"
 236                    STAMP_SPACE " - transp: offset: %i, length: %i, MSB: %i\n",
 237                    finfo->type, finfo->type_aux, finfo->visual,
 238                    vinfo->bits_per_pixel, vinfo->grayscale,
 239                    vinfo->red.offset, vinfo->red.length, vinfo->red.msb_right,
 240                    vinfo->green.offset, vinfo->green.length,
 241                    vinfo->green.msb_right,
 242                    vinfo->blue.offset, vinfo->blue.length,
 243                    vinfo->blue.msb_right,
 244                    vinfo->transp.offset, vinfo->transp.length,
 245                    vinfo->transp.msb_right);
 246
 247         /* We only handle packed formats at the moment. */
 248         if (finfo->type != FB_TYPE_PACKED_PIXELS)
 249                 return 0;
 250
 251         /* We only handle true-colour frame buffers at the moment. */
 252         if (finfo->visual != FB_VISUAL_TRUECOLOR || vinfo->grayscale != 0)
 253                 return 0;
 254
 255         /* We only support formats with MSBs on the left. */
 256         if (vinfo->red.msb_right != 0 || vinfo->green.msb_right != 0 ||
 257             vinfo->blue.msb_right != 0)
 258                 return 0;
 259
 260         /* Work out the format type from the offsets. We only support RGBA and
 261          * ARGB at the moment. */
 262         type = PIXMAN_TYPE_OTHER;
 263
 264         if ((vinfo->transp.offset >= vinfo->red.offset ||
 265              vinfo->transp.length == 0) &&
 266             vinfo->red.offset >= vinfo->green.offset &&
 267             vinfo->green.offset >= vinfo->blue.offset)
 268                 type = PIXMAN_TYPE_ARGB;
 269         else if (vinfo->red.offset >= vinfo->green.offset &&
 270                  vinfo->green.offset >= vinfo->blue.offset &&
 271                  vinfo->blue.offset >= vinfo->transp.offset)
 272                 type = PIXMAN_TYPE_RGBA;
 273
 274         if (type == PIXMAN_TYPE_OTHER)
 275                 return 0;
 276
 277         /* Build the format. */
 278         return PIXMAN_FORMAT(vinfo->bits_per_pixel, type,
 279                              vinfo->transp.length,
 280                              vinfo->red.length,
 281                              vinfo->green.length,
 282                              vinfo->blue.length);
 283 }
 284
 285 static int
 286 calculate_refresh_rate(struct fb_var_screeninfo *vinfo)
 287 {
 288         uint64_t quot;
 289
 290         /* Calculate monitor refresh rate. Default is 60 Hz. Units are mHz. */
 291         quot = (vinfo->upper_margin + vinfo->lower_margin + vinfo->yres);
 292         quot *= (vinfo->left_margin + vinfo->right_margin + vinfo->xres);
 293         quot *= vinfo->pixclock;
 294
 295         if (quot > 0) {
 296                 uint64_t refresh_rate;
 297
 298                 refresh_rate = 1000000000000000LLU / quot;
 299                 if (refresh_rate > 200000)
 300                         refresh_rate = 200000; /* cap at 200 Hz */
 301
 302                 return refresh_rate;
 303         }
 304
 305         return 60 * 1000; /* default to 60 Hz */
 306 }
 307
 308 static int
 309 fbdev_query_screen_info(struct fbdev_output *output, int fd,
 310                         struct fbdev_screeninfo *info)
 311 {
 312         struct fb_var_screeninfo varinfo;
 313         struct fb_fix_screeninfo fixinfo;
 314
 315         /* Probe the device for screen information. */
 316         if (ioctl(fd, FBIOGET_FSCREENINFO, &fixinfo) < 0 ||
 317             ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) < 0) {
 318                 return -1;
 319         }
 320
 321         /* Store the pertinent data. */
 322         info->x_resolution = varinfo.xres;
 323         info->y_resolution = varinfo.yres;
 324         info->width_mm = varinfo.width;
 325         info->height_mm = varinfo.height;
 326         info->bits_per_pixel = varinfo.bits_per_pixel;
 327
 328         info->buffer_length = fixinfo.smem_len;
 329         info->line_length = fixinfo.line_length;
 330         strncpy(info->id, fixinfo.id, sizeof(info->id) / sizeof(*info->id));
 331
 332         info->pixel_format = calculate_pixman_format(&varinfo, &fixinfo);
 333         info->refresh_rate = calculate_refresh_rate(&varinfo);
 334
 335         if (info->pixel_format == 0) {
 336                 weston_log("Frame buffer uses an unsupported format.\n");
 337                 return -1;
 338         }
 339
 340         return 1;
 341 }
 342
 343 static int
 344 fbdev_set_screen_info(struct fbdev_output *output, int fd,
 345                       struct fbdev_screeninfo *info)
 346 {
 347         struct fb_var_screeninfo varinfo;
 348
 349         /* Grab the current screen information. */
 350         if (ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) < 0) {
 351                 return -1;
 352         }
 353
 354         /* Update the information. */
 355         varinfo.xres = info->x_resolution;
 356         varinfo.yres = info->y_resolution;
 357         varinfo.width = info->width_mm;
 358         varinfo.height = info->height_mm;
 359         varinfo.bits_per_pixel = info->bits_per_pixel;
 360
 361         /* Try to set up an ARGB (x8r8g8b8) pixel format. */
 362         varinfo.grayscale = 0;
 363         varinfo.transp.offset = 24;
 364         varinfo.transp.length = 0;
 365         varinfo.transp.msb_right = 0;
 366         varinfo.red.offset = 16;
 367         varinfo.red.length = 8;
 368         varinfo.red.msb_right = 0;
 369         varinfo.green.offset = 8;
 370         varinfo.green.length = 8;
 371         varinfo.green.msb_right = 0;
 372         varinfo.blue.offset = 0;
 373         varinfo.blue.length = 8;
 374         varinfo.blue.msb_right = 0;
 375
 376         /* Set the device's screen information. */
 377         if (ioctl(fd, FBIOPUT_VSCREENINFO, &varinfo) < 0) {
 378                 return -1;
 379         }
 380
 381         return 1;
 382 }
 383
 384 static void fbdev_frame_buffer_destroy(struct fbdev_output *output);
 385
 386 /* Returns an FD for the frame buffer device. */
 387 static int
 388 fbdev_frame_buffer_open(struct fbdev_output *output, const char *fb_dev,
 389                         struct fbdev_screeninfo *screen_info)
 390 {
 391         int fd = -1;
 392
 393         weston_log("Opening fbdev frame buffer.\n");
 394
 395         /* Open the frame buffer device. */
 396         fd = open(fb_dev, O_RDWR | O_CLOEXEC);
 397         if (fd < 0) {
 398                 weston_log("Failed to open frame buffer device ‘%s’: %s\n",
 399                            fb_dev, strerror(errno));
 400                 return -1;
 401         }
 402
 403         /* Grab the screen info. */
 404         if (fbdev_query_screen_info(output, fd, screen_info) < 0) {
 405                 weston_log("Failed to get frame buffer info: %s\n",
 406                            strerror(errno));
 407
 408                 close(fd);
 409                 return -1;
 410         }
 411
 412         return fd;
 413 }
 414
 415 /* Closes the FD on success or failure. */
 416 static int
 417 fbdev_frame_buffer_map(struct fbdev_output *output, int fd)
 418 {
 419         int retval = -1;
 420
 421         weston_log("Mapping fbdev frame buffer.\n");
 422
 423         /* Map the frame buffer. Write-only mode, since we don't want to read
 424          * anything back (because it's slow). */
 425         output->fb = mmap(NULL, output->fb_info.buffer_length,
 426                           PROT_WRITE, MAP_SHARED, fd, 0);
 427         if (output->fb == MAP_FAILED) {
 428                 weston_log("Failed to mmap frame buffer: %s\n",
 429                            strerror(errno));
 430                 goto out_close;
 431         }
 432
 433         /* Create a pixman image to wrap the memory mapped frame buffer. */
 434         output->hw_surface =
 435                 pixman_image_create_bits(output->fb_info.pixel_format,
 436                                          output->fb_info.x_resolution,
 437                                          output->fb_info.y_resolution,
 438                                          output->fb,
 439                                          output->fb_info.line_length);
 440         if (output->hw_surface == NULL) {
 441                 weston_log("Failed to create surface for frame buffer.\n");
 442                 goto out_unmap;
 443         }
 444
 445         /* Success! */
 446         retval = 0;
 447
 448 out_unmap:
 449         if (retval != 0 && output->fb != NULL)
 450                 fbdev_frame_buffer_destroy(output);
 451
 452 out_close:
 453         if (fd >= 0)
 454                 close(fd);
 455
 456         return retval;
 457 }
 458
 459 static void
 460 fbdev_frame_buffer_destroy(struct fbdev_output *output)
 461 {
 462         weston_log("Destroying fbdev frame buffer.\n");
 463
 464         if (munmap(output->fb, output->fb_info.buffer_length) < 0)
 465                 weston_log("Failed to munmap frame buffer: %s\n",
 466                            strerror(errno));
 467
 468         output->fb = NULL;
 469 }
 470
 471 static void fbdev_output_destroy(struct weston_output *base);
 472 static void fbdev_output_disable(struct weston_output *base);
 473
 474 static int
 475 fbdev_output_create(struct fbdev_compositor *compositor,
 476                     const char *device)
 477 {
 478         struct fbdev_output *output;
 479         pixman_transform_t transform;
 480         int fb_fd;
 481         int shadow_width, shadow_height;
 482         int width, height;
 483         unsigned int bytes_per_pixel;
 484         struct wl_event_loop *loop;
 485
 486         weston_log("Creating fbdev output.\n");
 487
 488         output = calloc(1, sizeof *output);
 489         if (!output)
 490                 return -1;
 491
 492         output->compositor = compositor;
 493         output->device = device;
 494
 495         /* Create the frame buffer. */
 496         fb_fd = fbdev_frame_buffer_open(output, device, &output->fb_info);
 497         if (fb_fd < 0) {
 498                 weston_log("Creating frame buffer failed.\n");
 499                 goto out_free;
 500         }
 501
 502         if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
 503                 weston_log("Mapping frame buffer failed.\n");
 504                 goto out_free;
 505         }
 506
 507         output->base.repaint = fbdev_output_repaint;
 508         output->base.destroy = fbdev_output_destroy;
 509         output->base.assign_planes = NULL;
 510         output->base.set_backlight = NULL;
 511         output->base.set_dpms = NULL;
 512         output->base.switch_mode = NULL;
 513
 514         /* only one static mode in list */
 515         output->mode.flags =
 516                 WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
 517         output->mode.width = output->fb_info.x_resolution;
 518         output->mode.height = output->fb_info.y_resolution;
 519         output->mode.refresh = output->fb_info.refresh_rate;
 520         wl_list_init(&output->base.mode_list);
 521         wl_list_insert(&output->base.mode_list, &output->mode.link);
 522
 523         output->base.current = &output->mode;
 524         output->base.origin = &output->mode;
 525         output->base.subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
 526         output->base.make = "unknown";
 527         output->base.model = output->fb_info.id;
 528
 529         weston_output_init(&output->base, &compositor->base,
 530                            0, 0, output->fb_info.width_mm,
 531                            output->fb_info.height_mm,
 532                            WL_OUTPUT_TRANSFORM_NORMAL);
 533
 534         width = output->fb_info.x_resolution;
 535         height = output->fb_info.y_resolution;
 536
 537         pixman_transform_init_identity(&transform);
 538         switch (output->base.transform) {
 539         default:
 540         case WL_OUTPUT_TRANSFORM_NORMAL:
 541                 shadow_width = width;
 542                 shadow_height = height;
 543                 pixman_transform_rotate(&transform,
 544                         NULL, 0, 0);
 545                 pixman_transform_translate(&transform, NULL,
 546                         0, 0);
 547                 break;
 548         case WL_OUTPUT_TRANSFORM_180:
 549                 shadow_width = width;
 550                 shadow_height = height;
 551                 pixman_transform_rotate(&transform,
 552                         NULL, -pixman_fixed_1, 0);
 553                 pixman_transform_translate(NULL, &transform,
 554                         pixman_int_to_fixed(shadow_width),
 555                         pixman_int_to_fixed(shadow_height));
 556                 break;
 557         case WL_OUTPUT_TRANSFORM_270:
 558                 shadow_width = height;
 559                 shadow_height = width;
 560                 pixman_transform_rotate(&transform,
 561                         NULL, 0, pixman_fixed_1);
 562                 pixman_transform_translate(&transform,
 563                         NULL,
 564                         pixman_int_to_fixed(shadow_width),
 565                         0);
 566                 break;
 567         case WL_OUTPUT_TRANSFORM_90:
 568                 shadow_width = height;
 569                 shadow_height = width;
 570                 pixman_transform_rotate(&transform,
 571                         NULL, 0, -pixman_fixed_1);
 572                 pixman_transform_translate(&transform,
 573                         NULL,
 574                         0,
 575                         pixman_int_to_fixed(shadow_height));
 576                 break;
 577         }
 578
 579         bytes_per_pixel = output->fb_info.bits_per_pixel / 8;
 580
 581         output->shadow_buf = malloc(width * height * bytes_per_pixel);
 582         output->shadow_surface =
 583                 pixman_image_create_bits(output->fb_info.pixel_format,
 584                                          shadow_width, shadow_height,
 585                                          output->shadow_buf,
 586                                          shadow_width * bytes_per_pixel);
 587         if (output->shadow_buf == NULL || output->shadow_surface == NULL) {
 588                 weston_log("Failed to create surface for frame buffer.\n");
 589                 goto out_hw_surface;
 590         }
 591
 592         /* No need in transform for normal output */
 593         if (output->base.transform != WL_OUTPUT_TRANSFORM_NORMAL)
 594                 pixman_image_set_transform(output->shadow_surface, &transform);
 595
 596         if (pixman_renderer_output_create(&output->base) < 0)
 597                 goto out_shadow_surface;
 598
 599         loop = wl_display_get_event_loop(compositor->base.wl_display);
 600         output->finish_frame_timer =
 601                 wl_event_loop_add_timer(loop, finish_frame_handler, output);
 602
 603         wl_list_insert(compositor->base.output_list.prev, &output->base.link);
 604
 605         weston_log("fbdev output %d×%d px\n",
 606                    output->mode.width, output->mode.height);
 607         weston_log_continue(STAMP_SPACE "guessing %d Hz and 96 dpi\n",
 608                             output->mode.refresh / 1000);
 609
 610         return 0;
 611
 612 out_shadow_surface:
 613         pixman_image_unref(output->shadow_surface);
 614         output->shadow_surface = NULL;
 615 out_hw_surface:
 616         free(output->shadow_buf);
 617         pixman_image_unref(output->hw_surface);
 618         output->hw_surface = NULL;
 619         weston_output_destroy(&output->base);
 620         fbdev_frame_buffer_destroy(output);
 621 out_free:
 622         free(output);
 623
 624         return -1;
 625 }
 626
 627 static void
 628 fbdev_output_destroy(struct weston_output *base)
 629 {
 630         struct fbdev_output *output = to_fbdev_output(base);
 631
 632         weston_log("Destroying fbdev output.\n");
 633
 634         /* Close the frame buffer. */
 635         fbdev_output_disable(base);
 636
 637         if (base->renderer_state != NULL)
 638                 pixman_renderer_output_destroy(base);
 639
 640         if (output->shadow_surface != NULL) {
 641                 pixman_image_unref(output->shadow_surface);
 642                 output->shadow_surface = NULL;
 643         }
 644
 645         if (output->shadow_buf != NULL) {
 646                 free(output->shadow_buf);
 647                 output->shadow_buf = NULL;
 648         }
 649
 650         /* Remove the output. */
 651         wl_list_remove(&output->base.link);
 652         weston_output_destroy(&output->base);
 653
 654         free(output);
 655 }
 656
 657 /* strcmp()-style return values. */
 658 static int
 659 compare_screen_info (const struct fbdev_screeninfo *a,
 660                      const struct fbdev_screeninfo *b)
 661 {
 662         if (a->x_resolution == b->x_resolution &&
 663             a->y_resolution == b->y_resolution &&
 664             a->width_mm == b->width_mm &&
 665             a->height_mm == b->height_mm &&
 666             a->bits_per_pixel == b->bits_per_pixel &&
 667             a->pixel_format == b->pixel_format &&
 668             a->refresh_rate == b->refresh_rate)
 669                 return 0;
 670
 671         return 1;
 672 }
 673
 674 static int
 675 fbdev_output_reenable(struct fbdev_compositor *compositor,
 676                       struct weston_output *base)
 677 {
 678         struct fbdev_output *output = to_fbdev_output(base);
 679         struct fbdev_screeninfo new_screen_info;
 680         int fb_fd;
 681
 682         weston_log("Re-enabling fbdev output.\n");
 683
 684         /* Create the frame buffer. */
 685         fb_fd = fbdev_frame_buffer_open(output, output->device,
 686                                         &new_screen_info);
 687         if (fb_fd < 0) {
 688                 weston_log("Creating frame buffer failed.\n");
 689                 goto err;
 690         }
 691
 692         /* Check whether the frame buffer details have changed since we were
 693          * disabled. */
 694         if (compare_screen_info (&output->fb_info, &new_screen_info) != 0) {
 695                 /* Perform a mode-set to restore the old mode. */
 696                 if (fbdev_set_screen_info(output, fb_fd,
 697                                           &output->fb_info) < 0) {
 698                         weston_log("Failed to restore mode settings. "
 699                                    "Attempting to re-open output anyway.\n");
 700                 }
 701
 702                 /* Remove and re-add the output so that resources depending on
 703                  * the frame buffer X/Y resolution (such as the shadow buffer)
 704                  * are re-initialised. */
 705                 fbdev_output_destroy(base);
 706                 fbdev_output_create(compositor, output->device);
 707
 708                 return 0;
 709         }
 710
 711         /* Map the device if it has the same details as before. */
 712         if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
 713                 weston_log("Mapping frame buffer failed.\n");
 714                 goto err;
 715         }
 716
 717         return 0;
 718
 719 err:
 720         return -1;
 721 }
 722
 723 /* NOTE: This leaves output->fb_info populated, caching data so that if
 724  * fbdev_output_reenable() is called again, it can determine whether a mode-set
 725  * is needed. */
 726 static void
 727 fbdev_output_disable(struct weston_output *base)
 728 {
 729         struct fbdev_output *output = to_fbdev_output(base);
 730
 731         weston_log("Disabling fbdev output.\n");
 732
 733         if (output->hw_surface != NULL) {
 734                 pixman_image_unref(output->hw_surface);
 735                 output->hw_surface = NULL;
 736         }
 737
 738         fbdev_frame_buffer_destroy(output);
 739 }
 740
 741 static void
 742 fbdev_compositor_destroy(struct weston_compositor *base)
 743 {
 744         struct fbdev_compositor *compositor = to_fbdev_compositor(base);
 745         struct udev_seat *seat, *next;
 746
 747         /* Destroy all inputs. */
 748         wl_list_for_each_safe(seat, next, &compositor->base.seat_list, base.link)
 749                 udev_seat_destroy(seat);
 750
 751         /* Destroy the output. */
 752         weston_compositor_shutdown(&compositor->base);
 753
 754         /* Chain up. */
 755         compositor->base.renderer->destroy(&compositor->base);
 756         tty_destroy(compositor->tty);
 757
 758         free(compositor);
 759 }
 760
 761 static void
 762 vt_func(struct weston_compositor *base, int event)
 763 {
 764         struct fbdev_compositor *compositor = to_fbdev_compositor(base);
 765         struct udev_seat *seat;
 766         struct weston_output *output;
 767
 768         switch (event) {
 769         case TTY_ENTER_VT:
 770                 weston_log("entering VT\n");
 771                 compositor->base.focus = 1;
 772                 compositor->base.state = compositor->prev_state;
 773
 774                 wl_list_for_each(output, &compositor->base.output_list, link) {
 775                         fbdev_output_reenable(compositor, output);
 776                 }
 777
 778                 weston_compositor_damage_all(&compositor->base);
 779
 780                 wl_list_for_each(seat, &compositor->base.seat_list, base.link)
 781                         udev_seat_enable(seat, compositor->udev);
 782                 break;
 783         case TTY_LEAVE_VT:
 784                 weston_log("leaving VT\n");
 785                 wl_list_for_each(seat, &compositor->base.seat_list, base.link)
 786                         udev_seat_disable(seat);
 787
 788                 wl_list_for_each(output, &compositor->base.output_list, link) {
 789                         fbdev_output_disable(output);
 790                 }
 791
 792                 compositor->base.focus = 0;
 793                 compositor->prev_state = compositor->base.state;
 794                 weston_compositor_offscreen(&compositor->base);
 795
 796                 /* If we have a repaint scheduled (from the idle handler), make
 797                  * sure we cancel that so we don't try to pageflip when we're
 798                  * vt switched away.  The OFFSCREEN state will prevent
 799                  * further attemps at repainting.  When we switch
 800                  * back, we schedule a repaint, which will process
 801                  * pending frame callbacks. */
 802
 803                 wl_list_for_each(output,
 804                                  &compositor->base.output_list, link) {
 805                         output->repaint_needed = 0;
 806                 }
 807
 808                 break;
 809         };
 810 }
 811
 812 static void
 813 fbdev_restore(struct weston_compositor *base)
 814 {
 815         struct fbdev_compositor *compositor = to_fbdev_compositor(base);
 816
 817         tty_reset(compositor->tty);
 818 }
 819
 820 static void
 821 switch_vt_binding(struct wl_seat *seat, uint32_t time, uint32_t key, void *data)
 822 {
 823         struct fbdev_compositor *ec = data;
 824
 825         tty_activate_vt(ec->tty, key - KEY_F1 + 1);
 826 }
 827
 828 static struct weston_compositor *
 829 fbdev_compositor_create(struct wl_display *display, int *argc, char *argv[],
 830                         const char *config_file, struct fbdev_parameters *param)
 831 {
 832         struct fbdev_compositor *compositor;
 833         const char *seat = default_seat;
 834         uint32_t key;
 835
 836         weston_log("initializing fbdev backend\n");
 837
 838         compositor = calloc(1, sizeof *compositor);
 839         if (compositor == NULL)
 840                 return NULL;
 841
 842         if (weston_compositor_init(&compositor->base, display, argc, argv,
 843                                    config_file) < 0)
 844                 goto out_free;
 845
 846         compositor->udev = udev_new();
 847         if (compositor->udev == NULL) {
 848                 weston_log("Failed to initialize udev context.\n");
 849                 goto out_compositor;
 850         }
 851
 852         /* Set up the TTY. */
 853         compositor->tty = tty_create(&compositor->base, vt_func, param->tty);
 854         if (!compositor->tty) {
 855                 weston_log("Failed to initialize tty.\n");
 856                 goto out_udev;
 857         }
 858
 859         compositor->base.destroy = fbdev_compositor_destroy;
 860         compositor->base.restore = fbdev_restore;
 861
 862         compositor->base.focus = 1;
 863         compositor->prev_state = WESTON_COMPOSITOR_ACTIVE;
 864
 865         for (key = KEY_F1; key < KEY_F9; key++)
 866                 weston_compositor_add_key_binding(&compositor->base, key,
 867                                                   MODIFIER_CTRL | MODIFIER_ALT,
 868                                                   switch_vt_binding,
 869                                                   compositor);
 870
 871         if (pixman_renderer_init(&compositor->base) < 0)
 872                 goto out_tty;
 873
 874         if (fbdev_output_create(compositor, param->device) < 0)
 875                 goto out_pixman;
 876
 877         udev_seat_create(&compositor->base, compositor->udev, seat);
 878
 879         return &compositor->base;
 880
 881 out_pixman:
 882         compositor->base.renderer->destroy(&compositor->base);
 883
 884 out_tty:
 885         tty_destroy(compositor->tty);
 886
 887 out_udev:
 888         udev_unref(compositor->udev);
 889
 890 out_compositor:
 891         weston_compositor_shutdown(&compositor->base);
 892
 893 out_free:
 894         free(compositor);
 895
 896         return NULL;
 897 }
 898
 899 WL_EXPORT struct weston_compositor *
 900 backend_init(struct wl_display *display, int *argc, char *argv[],
 901              const char *config_file)
 902 {
 903         /* TODO: Ideally, available frame buffers should be enumerated using
 904          * udev, rather than passing a device node in as a parameter. */
 905         struct fbdev_parameters param = {
 906                 .tty = 0, /* default to current tty */
 907                 .device = "/dev/fb0", /* default frame buffer */
 908         };
 909
 910         const struct weston_option fbdev_options[] = {
 911                 { WESTON_OPTION_INTEGER, "tty", 0, &param.tty },
 912                 { WESTON_OPTION_STRING, "device", 0, &param.device },
 913         };
 914
 915         parse_options(fbdev_options, ARRAY_LENGTH(fbdev_options), argc, argv);
 916
 917         return fbdev_compositor_create(display, argc, argv, config_file,
 918                                        &param);
 919 }