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_start_repaint_loop(struct weston_output *output)
 127 {
 128         uint32_t msec;
 129         struct timeval tv;
 130
 131         gettimeofday(&tv, NULL);
 132         msec = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 133         weston_output_finish_frame(output, msec);
 134 }
 135
 136 static void
 137 fbdev_output_repaint(struct weston_output *base, pixman_region32_t *damage)
 138 {
 139         struct fbdev_output *output = to_fbdev_output(base);
 140         struct weston_compositor *ec = output->base.compositor;
 141         pixman_box32_t *rects;
 142         int nrects, i, src_x, src_y, x1, y1, x2, y2, width, height;
 143
 144         /* Repaint the damaged region onto the back buffer. */
 145         pixman_renderer_output_set_buffer(base, output->shadow_surface);
 146         ec->renderer->repaint_output(base, damage);
 147
 148         /* Transform and composite onto the frame buffer. */
 149         width = pixman_image_get_width(output->shadow_surface);
 150         height = pixman_image_get_height(output->shadow_surface);
 151         rects = pixman_region32_rectangles(damage, &nrects);
 152
 153         for (i = 0; i < nrects; i++) {
 154                 switch (base->transform) {
 155                 default:
 156                 case WL_OUTPUT_TRANSFORM_NORMAL:
 157                         x1 = rects[i].x1;
 158                         x2 = rects[i].x2;
 159                         y1 = rects[i].y1;
 160                         y2 = rects[i].y2;
 161                         break;
 162                 case WL_OUTPUT_TRANSFORM_180:
 163                         x1 = width - rects[i].x2;
 164                         x2 = width - rects[i].x1;
 165                         y1 = height - rects[i].y2;
 166                         y2 = height - rects[i].y1;
 167                         break;
 168                 case WL_OUTPUT_TRANSFORM_90:
 169                         x1 = height - rects[i].y2;
 170                         x2 = height - rects[i].y1;
 171                         y1 = rects[i].x1;
 172                         y2 = rects[i].x2;
 173                         break;
 174                 case WL_OUTPUT_TRANSFORM_270:
 175                         x1 = rects[i].y1;
 176                         x2 = rects[i].y2;
 177                         y1 = width - rects[i].x2;
 178                         y2 = width - rects[i].x1;
 179                         break;
 180                 }
 181                 src_x = x1;
 182                 src_y = y1;
 183
 184                 pixman_image_composite32(PIXMAN_OP_SRC,
 185                         output->shadow_surface, /* src */
 186                         NULL /* mask */,
 187                         output->hw_surface, /* dest */
 188                         src_x, src_y, /* src_x, src_y */
 189                         0, 0, /* mask_x, mask_y */
 190                         x1, y1, /* dest_x, dest_y */
 191                         x2 - x1, /* width */
 192                         y2 - y1 /* height */);
 193         }
 194
 195         /* Update the damage region. */
 196         pixman_region32_subtract(&ec->primary_plane.damage,
 197                                  &ec->primary_plane.damage, damage);
 198
 199         /* Schedule the end of the frame. We do not sync this to the frame
 200          * buffer clock because users who want that should be using the DRM
 201          * compositor. FBIO_WAITFORVSYNC blocks and FB_ACTIVATE_VBL requires
 202          * panning, which is broken in most kernel drivers.
 203          *
 204          * Finish the frame synchronised to the specified refresh rate. The
 205          * refresh rate is given in mHz and the interval in ms. */
 206         wl_event_source_timer_update(output->finish_frame_timer,
 207                                      1000000 / output->mode.refresh);
 208 }
 209
 210 static int
 211 finish_frame_handler(void *data)
 212 {
 213         struct fbdev_output *output = data;
 214
 215         fbdev_output_start_repaint_loop(&output->base);
 216
 217         return 1;
 218 }
 219
 220 static pixman_format_code_t
 221 calculate_pixman_format(struct fb_var_screeninfo *vinfo,
 222                         struct fb_fix_screeninfo *finfo)
 223 {
 224         /* Calculate the pixman format supported by the frame buffer from the
 225          * buffer's metadata. Return 0 if no known pixman format is supported
 226          * (since this has depth 0 it's guaranteed to not conflict with any
 227          * actual pixman format).
 228          *
 229          * Documentation on the vinfo and finfo structures:
 230          *    http://www.mjmwired.net/kernel/Documentation/fb/api.txt
 231          *
 232          * TODO: Try a bit harder to support other formats, including setting
 233          * the preferred format in the hardware. */
 234         int type;
 235
 236         weston_log("Calculating pixman format from:\n"
 237                    STAMP_SPACE " - type: %i (aux: %i)\n"
 238                    STAMP_SPACE " - visual: %i\n"
 239                    STAMP_SPACE " - bpp: %i (grayscale: %i)\n"
 240                    STAMP_SPACE " - red: offset: %i, length: %i, MSB: %i\n"
 241                    STAMP_SPACE " - green: offset: %i, length: %i, MSB: %i\n"
 242                    STAMP_SPACE " - blue: offset: %i, length: %i, MSB: %i\n"
 243                    STAMP_SPACE " - transp: offset: %i, length: %i, MSB: %i\n",
 244                    finfo->type, finfo->type_aux, finfo->visual,
 245                    vinfo->bits_per_pixel, vinfo->grayscale,
 246                    vinfo->red.offset, vinfo->red.length, vinfo->red.msb_right,
 247                    vinfo->green.offset, vinfo->green.length,
 248                    vinfo->green.msb_right,
 249                    vinfo->blue.offset, vinfo->blue.length,
 250                    vinfo->blue.msb_right,
 251                    vinfo->transp.offset, vinfo->transp.length,
 252                    vinfo->transp.msb_right);
 253
 254         /* We only handle packed formats at the moment. */
 255         if (finfo->type != FB_TYPE_PACKED_PIXELS)
 256                 return 0;
 257
 258         /* We only handle true-colour frame buffers at the moment. */
 259         if (finfo->visual != FB_VISUAL_TRUECOLOR || vinfo->grayscale != 0)
 260                 return 0;
 261
 262         /* We only support formats with MSBs on the left. */
 263         if (vinfo->red.msb_right != 0 || vinfo->green.msb_right != 0 ||
 264             vinfo->blue.msb_right != 0)
 265                 return 0;
 266
 267         /* Work out the format type from the offsets. We only support RGBA and
 268          * ARGB at the moment. */
 269         type = PIXMAN_TYPE_OTHER;
 270
 271         if ((vinfo->transp.offset >= vinfo->red.offset ||
 272              vinfo->transp.length == 0) &&
 273             vinfo->red.offset >= vinfo->green.offset &&
 274             vinfo->green.offset >= vinfo->blue.offset)
 275                 type = PIXMAN_TYPE_ARGB;
 276         else if (vinfo->red.offset >= vinfo->green.offset &&
 277                  vinfo->green.offset >= vinfo->blue.offset &&
 278                  vinfo->blue.offset >= vinfo->transp.offset)
 279                 type = PIXMAN_TYPE_RGBA;
 280
 281         if (type == PIXMAN_TYPE_OTHER)
 282                 return 0;
 283
 284         /* Build the format. */
 285         return PIXMAN_FORMAT(vinfo->bits_per_pixel, type,
 286                              vinfo->transp.length,
 287                              vinfo->red.length,
 288                              vinfo->green.length,
 289                              vinfo->blue.length);
 290 }
 291
 292 static int
 293 calculate_refresh_rate(struct fb_var_screeninfo *vinfo)
 294 {
 295         uint64_t quot;
 296
 297         /* Calculate monitor refresh rate. Default is 60 Hz. Units are mHz. */
 298         quot = (vinfo->upper_margin + vinfo->lower_margin + vinfo->yres);
 299         quot *= (vinfo->left_margin + vinfo->right_margin + vinfo->xres);
 300         quot *= vinfo->pixclock;
 301
 302         if (quot > 0) {
 303                 uint64_t refresh_rate;
 304
 305                 refresh_rate = 1000000000000000LLU / quot;
 306                 if (refresh_rate > 200000)
 307                         refresh_rate = 200000; /* cap at 200 Hz */
 308
 309                 return refresh_rate;
 310         }
 311
 312         return 60 * 1000; /* default to 60 Hz */
 313 }
 314
 315 static int
 316 fbdev_query_screen_info(struct fbdev_output *output, int fd,
 317                         struct fbdev_screeninfo *info)
 318 {
 319         struct fb_var_screeninfo varinfo;
 320         struct fb_fix_screeninfo fixinfo;
 321
 322         /* Probe the device for screen information. */
 323         if (ioctl(fd, FBIOGET_FSCREENINFO, &fixinfo) < 0 ||
 324             ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) < 0) {
 325                 return -1;
 326         }
 327
 328         /* Store the pertinent data. */
 329         info->x_resolution = varinfo.xres;
 330         info->y_resolution = varinfo.yres;
 331         info->width_mm = varinfo.width;
 332         info->height_mm = varinfo.height;
 333         info->bits_per_pixel = varinfo.bits_per_pixel;
 334
 335         info->buffer_length = fixinfo.smem_len;
 336         info->line_length = fixinfo.line_length;
 337         strncpy(info->id, fixinfo.id, sizeof(info->id) / sizeof(*info->id));
 338
 339         info->pixel_format = calculate_pixman_format(&varinfo, &fixinfo);
 340         info->refresh_rate = calculate_refresh_rate(&varinfo);
 341
 342         if (info->pixel_format == 0) {
 343                 weston_log("Frame buffer uses an unsupported format.\n");
 344                 return -1;
 345         }
 346
 347         return 1;
 348 }
 349
 350 static int
 351 fbdev_set_screen_info(struct fbdev_output *output, int fd,
 352                       struct fbdev_screeninfo *info)
 353 {
 354         struct fb_var_screeninfo varinfo;
 355
 356         /* Grab the current screen information. */
 357         if (ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) < 0) {
 358                 return -1;
 359         }
 360
 361         /* Update the information. */
 362         varinfo.xres = info->x_resolution;
 363         varinfo.yres = info->y_resolution;
 364         varinfo.width = info->width_mm;
 365         varinfo.height = info->height_mm;
 366         varinfo.bits_per_pixel = info->bits_per_pixel;
 367
 368         /* Try to set up an ARGB (x8r8g8b8) pixel format. */
 369         varinfo.grayscale = 0;
 370         varinfo.transp.offset = 24;
 371         varinfo.transp.length = 0;
 372         varinfo.transp.msb_right = 0;
 373         varinfo.red.offset = 16;
 374         varinfo.red.length = 8;
 375         varinfo.red.msb_right = 0;
 376         varinfo.green.offset = 8;
 377         varinfo.green.length = 8;
 378         varinfo.green.msb_right = 0;
 379         varinfo.blue.offset = 0;
 380         varinfo.blue.length = 8;
 381         varinfo.blue.msb_right = 0;
 382
 383         /* Set the device's screen information. */
 384         if (ioctl(fd, FBIOPUT_VSCREENINFO, &varinfo) < 0) {
 385                 return -1;
 386         }
 387
 388         return 1;
 389 }
 390
 391 static void fbdev_frame_buffer_destroy(struct fbdev_output *output);
 392
 393 /* Returns an FD for the frame buffer device. */
 394 static int
 395 fbdev_frame_buffer_open(struct fbdev_output *output, const char *fb_dev,
 396                         struct fbdev_screeninfo *screen_info)
 397 {
 398         int fd = -1;
 399
 400         weston_log("Opening fbdev frame buffer.\n");
 401
 402         /* Open the frame buffer device. */
 403         fd = open(fb_dev, O_RDWR | O_CLOEXEC);
 404         if (fd < 0) {
 405                 weston_log("Failed to open frame buffer device ‘%s’: %s\n",
 406                            fb_dev, strerror(errno));
 407                 return -1;
 408         }
 409
 410         /* Grab the screen info. */
 411         if (fbdev_query_screen_info(output, fd, screen_info) < 0) {
 412                 weston_log("Failed to get frame buffer info: %s\n",
 413                            strerror(errno));
 414
 415                 close(fd);
 416                 return -1;
 417         }
 418
 419         return fd;
 420 }
 421
 422 /* Closes the FD on success or failure. */
 423 static int
 424 fbdev_frame_buffer_map(struct fbdev_output *output, int fd)
 425 {
 426         int retval = -1;
 427
 428         weston_log("Mapping fbdev frame buffer.\n");
 429
 430         /* Map the frame buffer. Write-only mode, since we don't want to read
 431          * anything back (because it's slow). */
 432         output->fb = mmap(NULL, output->fb_info.buffer_length,
 433                           PROT_WRITE, MAP_SHARED, fd, 0);
 434         if (output->fb == MAP_FAILED) {
 435                 weston_log("Failed to mmap frame buffer: %s\n",
 436                            strerror(errno));
 437                 goto out_close;
 438         }
 439
 440         /* Create a pixman image to wrap the memory mapped frame buffer. */
 441         output->hw_surface =
 442                 pixman_image_create_bits(output->fb_info.pixel_format,
 443                                          output->fb_info.x_resolution,
 444                                          output->fb_info.y_resolution,
 445                                          output->fb,
 446                                          output->fb_info.line_length);
 447         if (output->hw_surface == NULL) {
 448                 weston_log("Failed to create surface for frame buffer.\n");
 449                 goto out_unmap;
 450         }
 451
 452         /* Success! */
 453         retval = 0;
 454
 455 out_unmap:
 456         if (retval != 0 && output->fb != NULL)
 457                 fbdev_frame_buffer_destroy(output);
 458
 459 out_close:
 460         if (fd >= 0)
 461                 close(fd);
 462
 463         return retval;
 464 }
 465
 466 static void
 467 fbdev_frame_buffer_destroy(struct fbdev_output *output)
 468 {
 469         weston_log("Destroying fbdev frame buffer.\n");
 470
 471         if (munmap(output->fb, output->fb_info.buffer_length) < 0)
 472                 weston_log("Failed to munmap frame buffer: %s\n",
 473                            strerror(errno));
 474
 475         output->fb = NULL;
 476 }
 477
 478 static void fbdev_output_destroy(struct weston_output *base);
 479 static void fbdev_output_disable(struct weston_output *base);
 480
 481 static int
 482 fbdev_output_create(struct fbdev_compositor *compositor,
 483                     const char *device)
 484 {
 485         struct fbdev_output *output;
 486         pixman_transform_t transform;
 487         int fb_fd;
 488         int shadow_width, shadow_height;
 489         int width, height;
 490         unsigned int bytes_per_pixel;
 491         struct wl_event_loop *loop;
 492
 493         weston_log("Creating fbdev output.\n");
 494
 495         output = calloc(1, sizeof *output);
 496         if (!output)
 497                 return -1;
 498
 499         output->compositor = compositor;
 500         output->device = device;
 501
 502         /* Create the frame buffer. */
 503         fb_fd = fbdev_frame_buffer_open(output, device, &output->fb_info);
 504         if (fb_fd < 0) {
 505                 weston_log("Creating frame buffer failed.\n");
 506                 goto out_free;
 507         }
 508
 509         if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
 510                 weston_log("Mapping frame buffer failed.\n");
 511                 goto out_free;
 512         }
 513
 514         output->base.start_repaint_loop = fbdev_output_start_repaint_loop;
 515         output->base.repaint = fbdev_output_repaint;
 516         output->base.destroy = fbdev_output_destroy;
 517         output->base.assign_planes = NULL;
 518         output->base.set_backlight = NULL;
 519         output->base.set_dpms = NULL;
 520         output->base.switch_mode = NULL;
 521
 522         /* only one static mode in list */
 523         output->mode.flags =
 524                 WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
 525         output->mode.width = output->fb_info.x_resolution;
 526         output->mode.height = output->fb_info.y_resolution;
 527         output->mode.refresh = output->fb_info.refresh_rate;
 528         wl_list_init(&output->base.mode_list);
 529         wl_list_insert(&output->base.mode_list, &output->mode.link);
 530
 531         output->base.current = &output->mode;
 532         output->base.origin = &output->mode;
 533         output->base.subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
 534         output->base.make = "unknown";
 535         output->base.model = output->fb_info.id;
 536
 537         weston_output_init(&output->base, &compositor->base,
 538                            0, 0, output->fb_info.width_mm,
 539                            output->fb_info.height_mm,
 540                            WL_OUTPUT_TRANSFORM_NORMAL);
 541
 542         width = output->fb_info.x_resolution;
 543         height = output->fb_info.y_resolution;
 544
 545         pixman_transform_init_identity(&transform);
 546         switch (output->base.transform) {
 547         default:
 548         case WL_OUTPUT_TRANSFORM_NORMAL:
 549                 shadow_width = width;
 550                 shadow_height = height;
 551                 pixman_transform_rotate(&transform,
 552                         NULL, 0, 0);
 553                 pixman_transform_translate(&transform, NULL,
 554                         0, 0);
 555                 break;
 556         case WL_OUTPUT_TRANSFORM_180:
 557                 shadow_width = width;
 558                 shadow_height = height;
 559                 pixman_transform_rotate(&transform,
 560                         NULL, -pixman_fixed_1, 0);
 561                 pixman_transform_translate(NULL, &transform,
 562                         pixman_int_to_fixed(shadow_width),
 563                         pixman_int_to_fixed(shadow_height));
 564                 break;
 565         case WL_OUTPUT_TRANSFORM_270:
 566                 shadow_width = height;
 567                 shadow_height = width;
 568                 pixman_transform_rotate(&transform,
 569                         NULL, 0, pixman_fixed_1);
 570                 pixman_transform_translate(&transform,
 571                         NULL,
 572                         pixman_int_to_fixed(shadow_width),
 573                         0);
 574                 break;
 575         case WL_OUTPUT_TRANSFORM_90:
 576                 shadow_width = height;
 577                 shadow_height = width;
 578                 pixman_transform_rotate(&transform,
 579                         NULL, 0, -pixman_fixed_1);
 580                 pixman_transform_translate(&transform,
 581                         NULL,
 582                         0,
 583                         pixman_int_to_fixed(shadow_height));
 584                 break;
 585         }
 586
 587         bytes_per_pixel = output->fb_info.bits_per_pixel / 8;
 588
 589         output->shadow_buf = malloc(width * height * bytes_per_pixel);
 590         output->shadow_surface =
 591                 pixman_image_create_bits(output->fb_info.pixel_format,
 592                                          shadow_width, shadow_height,
 593                                          output->shadow_buf,
 594                                          shadow_width * bytes_per_pixel);
 595         if (output->shadow_buf == NULL || output->shadow_surface == NULL) {
 596                 weston_log("Failed to create surface for frame buffer.\n");
 597                 goto out_hw_surface;
 598         }
 599
 600         /* No need in transform for normal output */
 601         if (output->base.transform != WL_OUTPUT_TRANSFORM_NORMAL)
 602                 pixman_image_set_transform(output->shadow_surface, &transform);
 603
 604         if (pixman_renderer_output_create(&output->base) < 0)
 605                 goto out_shadow_surface;
 606
 607         loop = wl_display_get_event_loop(compositor->base.wl_display);
 608         output->finish_frame_timer =
 609                 wl_event_loop_add_timer(loop, finish_frame_handler, output);
 610
 611         wl_list_insert(compositor->base.output_list.prev, &output->base.link);
 612
 613         weston_log("fbdev output %d×%d px\n",
 614                    output->mode.width, output->mode.height);
 615         weston_log_continue(STAMP_SPACE "guessing %d Hz and 96 dpi\n",
 616                             output->mode.refresh / 1000);
 617
 618         return 0;
 619
 620 out_shadow_surface:
 621         pixman_image_unref(output->shadow_surface);
 622         output->shadow_surface = NULL;
 623 out_hw_surface:
 624         free(output->shadow_buf);
 625         pixman_image_unref(output->hw_surface);
 626         output->hw_surface = NULL;
 627         weston_output_destroy(&output->base);
 628         fbdev_frame_buffer_destroy(output);
 629 out_free:
 630         free(output);
 631
 632         return -1;
 633 }
 634
 635 static void
 636 fbdev_output_destroy(struct weston_output *base)
 637 {
 638         struct fbdev_output *output = to_fbdev_output(base);
 639
 640         weston_log("Destroying fbdev output.\n");
 641
 642         /* Close the frame buffer. */
 643         fbdev_output_disable(base);
 644
 645         if (base->renderer_state != NULL)
 646                 pixman_renderer_output_destroy(base);
 647
 648         if (output->shadow_surface != NULL) {
 649                 pixman_image_unref(output->shadow_surface);
 650                 output->shadow_surface = NULL;
 651         }
 652
 653         if (output->shadow_buf != NULL) {
 654                 free(output->shadow_buf);
 655                 output->shadow_buf = NULL;
 656         }
 657
 658         /* Remove the output. */
 659         wl_list_remove(&output->base.link);
 660         weston_output_destroy(&output->base);
 661
 662         free(output);
 663 }
 664
 665 /* strcmp()-style return values. */
 666 static int
 667 compare_screen_info (const struct fbdev_screeninfo *a,
 668                      const struct fbdev_screeninfo *b)
 669 {
 670         if (a->x_resolution == b->x_resolution &&
 671             a->y_resolution == b->y_resolution &&
 672             a->width_mm == b->width_mm &&
 673             a->height_mm == b->height_mm &&
 674             a->bits_per_pixel == b->bits_per_pixel &&
 675             a->pixel_format == b->pixel_format &&
 676             a->refresh_rate == b->refresh_rate)
 677                 return 0;
 678
 679         return 1;
 680 }
 681
 682 static int
 683 fbdev_output_reenable(struct fbdev_compositor *compositor,
 684                       struct weston_output *base)
 685 {
 686         struct fbdev_output *output = to_fbdev_output(base);
 687         struct fbdev_screeninfo new_screen_info;
 688         int fb_fd;
 689
 690         weston_log("Re-enabling fbdev output.\n");
 691
 692         /* Create the frame buffer. */
 693         fb_fd = fbdev_frame_buffer_open(output, output->device,
 694                                         &new_screen_info);
 695         if (fb_fd < 0) {
 696                 weston_log("Creating frame buffer failed.\n");
 697                 goto err;
 698         }
 699
 700         /* Check whether the frame buffer details have changed since we were
 701          * disabled. */
 702         if (compare_screen_info (&output->fb_info, &new_screen_info) != 0) {
 703                 /* Perform a mode-set to restore the old mode. */
 704                 if (fbdev_set_screen_info(output, fb_fd,
 705                                           &output->fb_info) < 0) {
 706                         weston_log("Failed to restore mode settings. "
 707                                    "Attempting to re-open output anyway.\n");
 708                 }
 709
 710                 /* Remove and re-add the output so that resources depending on
 711                  * the frame buffer X/Y resolution (such as the shadow buffer)
 712                  * are re-initialised. */
 713                 fbdev_output_destroy(base);
 714                 fbdev_output_create(compositor, output->device);
 715
 716                 return 0;
 717         }
 718
 719         /* Map the device if it has the same details as before. */
 720         if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
 721                 weston_log("Mapping frame buffer failed.\n");
 722                 goto err;
 723         }
 724
 725         return 0;
 726
 727 err:
 728         return -1;
 729 }
 730
 731 /* NOTE: This leaves output->fb_info populated, caching data so that if
 732  * fbdev_output_reenable() is called again, it can determine whether a mode-set
 733  * is needed. */
 734 static void
 735 fbdev_output_disable(struct weston_output *base)
 736 {
 737         struct fbdev_output *output = to_fbdev_output(base);
 738
 739         weston_log("Disabling fbdev output.\n");
 740
 741         if (output->hw_surface != NULL) {
 742                 pixman_image_unref(output->hw_surface);
 743                 output->hw_surface = NULL;
 744         }
 745
 746         fbdev_frame_buffer_destroy(output);
 747 }
 748
 749 static void
 750 fbdev_compositor_destroy(struct weston_compositor *base)
 751 {
 752         struct fbdev_compositor *compositor = to_fbdev_compositor(base);
 753         struct udev_seat *seat, *next;
 754
 755         /* Destroy all inputs. */
 756         wl_list_for_each_safe(seat, next, &compositor->base.seat_list, base.link)
 757                 udev_seat_destroy(seat);
 758
 759         /* Destroy the output. */
 760         weston_compositor_shutdown(&compositor->base);
 761
 762         /* Chain up. */
 763         compositor->base.renderer->destroy(&compositor->base);
 764         tty_destroy(compositor->tty);
 765
 766         free(compositor);
 767 }
 768
 769 static void
 770 vt_func(struct weston_compositor *base, int event)
 771 {
 772         struct fbdev_compositor *compositor = to_fbdev_compositor(base);
 773         struct udev_seat *seat;
 774         struct weston_output *output;
 775
 776         switch (event) {
 777         case TTY_ENTER_VT:
 778                 weston_log("entering VT\n");
 779                 compositor->base.focus = 1;
 780                 compositor->base.state = compositor->prev_state;
 781
 782                 wl_list_for_each(output, &compositor->base.output_list, link) {
 783                         fbdev_output_reenable(compositor, output);
 784                 }
 785
 786                 weston_compositor_damage_all(&compositor->base);
 787
 788                 wl_list_for_each(seat, &compositor->base.seat_list, base.link)
 789                         udev_seat_enable(seat, compositor->udev);
 790                 break;
 791         case TTY_LEAVE_VT:
 792                 weston_log("leaving VT\n");
 793                 wl_list_for_each(seat, &compositor->base.seat_list, base.link)
 794                         udev_seat_disable(seat);
 795
 796                 wl_list_for_each(output, &compositor->base.output_list, link) {
 797                         fbdev_output_disable(output);
 798                 }
 799
 800                 compositor->base.focus = 0;
 801                 compositor->prev_state = compositor->base.state;
 802                 weston_compositor_offscreen(&compositor->base);
 803
 804                 /* If we have a repaint scheduled (from the idle handler), make
 805                  * sure we cancel that so we don't try to pageflip when we're
 806                  * vt switched away.  The OFFSCREEN state will prevent
 807                  * further attemps at repainting.  When we switch
 808                  * back, we schedule a repaint, which will process
 809                  * pending frame callbacks. */
 810
 811                 wl_list_for_each(output,
 812                                  &compositor->base.output_list, link) {
 813                         output->repaint_needed = 0;
 814                 }
 815
 816                 break;
 817         };
 818 }
 819
 820 static void
 821 fbdev_restore(struct weston_compositor *base)
 822 {
 823         struct fbdev_compositor *compositor = to_fbdev_compositor(base);
 824
 825         tty_reset(compositor->tty);
 826 }
 827
 828 static void
 829 switch_vt_binding(struct wl_seat *seat, uint32_t time, uint32_t key, void *data)
 830 {
 831         struct fbdev_compositor *ec = data;
 832
 833         tty_activate_vt(ec->tty, key - KEY_F1 + 1);
 834 }
 835
 836 static struct weston_compositor *
 837 fbdev_compositor_create(struct wl_display *display, int *argc, char *argv[],
 838                         const char *config_file, struct fbdev_parameters *param)
 839 {
 840         struct fbdev_compositor *compositor;
 841         const char *seat = default_seat;
 842         uint32_t key;
 843
 844         weston_log("initializing fbdev backend\n");
 845
 846         compositor = calloc(1, sizeof *compositor);
 847         if (compositor == NULL)
 848                 return NULL;
 849
 850         if (weston_compositor_init(&compositor->base, display, argc, argv,
 851                                    config_file) < 0)
 852                 goto out_free;
 853
 854         compositor->udev = udev_new();
 855         if (compositor->udev == NULL) {
 856                 weston_log("Failed to initialize udev context.\n");
 857                 goto out_compositor;
 858         }
 859
 860         /* Set up the TTY. */
 861         compositor->tty = tty_create(&compositor->base, vt_func, param->tty);
 862         if (!compositor->tty) {
 863                 weston_log("Failed to initialize tty.\n");
 864                 goto out_udev;
 865         }
 866
 867         compositor->base.destroy = fbdev_compositor_destroy;
 868         compositor->base.restore = fbdev_restore;
 869
 870         compositor->base.focus = 1;
 871         compositor->prev_state = WESTON_COMPOSITOR_ACTIVE;
 872
 873         for (key = KEY_F1; key < KEY_F9; key++)
 874                 weston_compositor_add_key_binding(&compositor->base, key,
 875                                                   MODIFIER_CTRL | MODIFIER_ALT,
 876                                                   switch_vt_binding,
 877                                                   compositor);
 878
 879         if (pixman_renderer_init(&compositor->base) < 0)
 880                 goto out_tty;
 881
 882         if (fbdev_output_create(compositor, param->device) < 0)
 883                 goto out_pixman;
 884
 885         udev_seat_create(&compositor->base, compositor->udev, seat);
 886
 887         return &compositor->base;
 888
 889 out_pixman:
 890         compositor->base.renderer->destroy(&compositor->base);
 891
 892 out_tty:
 893         tty_destroy(compositor->tty);
 894
 895 out_udev:
 896         udev_unref(compositor->udev);
 897
 898 out_compositor:
 899         weston_compositor_shutdown(&compositor->base);
 900
 901 out_free:
 902         free(compositor);
 903
 904         return NULL;
 905 }
 906
 907 WL_EXPORT struct weston_compositor *
 908 backend_init(struct wl_display *display, int *argc, char *argv[],
 909              const char *config_file)
 910 {
 911         /* TODO: Ideally, available frame buffers should be enumerated using
 912          * udev, rather than passing a device node in as a parameter. */
 913         struct fbdev_parameters param = {
 914                 .tty = 0, /* default to current tty */
 915                 .device = "/dev/fb0", /* default frame buffer */
 916         };
 917
 918         const struct weston_option fbdev_options[] = {
 919                 { WESTON_OPTION_INTEGER, "tty", 0, &param.tty },
 920                 { WESTON_OPTION_STRING, "device", 0, &param.device },
 921         };
 922
 923         parse_options(fbdev_options, ARRAY_LENGTH(fbdev_options), argc, argv);
 924
 925         return fbdev_compositor_create(display, argc, argv, config_file,
 926                                        &param);
 927 }