src/video/omapdss/linux/fbdev.c

   1 /*
   2  * (C) Gražvydas "notaz" Ignotas, 2009-2010
   3  *
   4  * This work is licensed under the terms of any of these licenses
   5  * (at your option):
   6  *  - GNU GPL, version 2 or later.
   7  *  - GNU LGPL, version 2.1 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <fcntl.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/mman.h>
  19 #include <unistd.h>
  20 #include <linux/fb.h>
  21 #include <linux/matroxfb.h>
  22
  23 #include "fbdev.h"
  24
  25 #define PFX "fbdev: "
  26
  27 #ifndef OMAPFB_WAITFORVSYNC_FRAME
  28 #define OMAPFB_WAITFORVSYNC_FRAME _IOWR('O', 70, int)
  29 #endif
  30
  31 struct vout_fbdev {
  32         int     fd;
  33         void    *mem;
  34         size_t  mem_size;
  35         struct  fb_var_screeninfo fbvar_old;
  36         struct  fb_var_screeninfo fbvar_new;
  37         int     buffer_write;
  38         int     fb_size;
  39         int     buffer_count;
  40         int     top_border, bottom_border;
  41         void    *mem_saved;
  42         size_t  mem_saved_size;
  43         unsigned long vsync_ioctl;
  44         int     vsync_arg;
  45 };
  46
  47 void *vout_fbdev_flip(struct vout_fbdev *fbdev)
  48 {
  49         int draw_buf;
  50
  51         if (fbdev->buffer_count < 2)
  52                 return fbdev->mem;
  53
  54         draw_buf = fbdev->buffer_write;
  55         fbdev->buffer_write++;
  56         if (fbdev->buffer_write >= fbdev->buffer_count)
  57                 fbdev->buffer_write = 0;
  58
  59         fbdev->fbvar_new.yoffset =
  60                 (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
  61                 fbdev->top_border;
  62
  63         ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
  64
  65         return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
  66 }
  67
  68 void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
  69 {
  70         if (fbdev->vsync_ioctl != 0)
  71                 ioctl(fbdev->fd, fbdev->vsync_ioctl, &fbdev->vsync_arg);
  72 }
  73
  74 /* it is recommended to call vout_fbdev_clear() before this */
  75 void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
  76                       int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
  77 {
  78         int w_total = left_border + w + right_border;
  79         int h_total = top_border + h + bottom_border;
  80         size_t mem_size;
  81         int ret;
  82
  83         // unblank to be sure the mode is really accepted
  84         ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
  85
  86         if (fbdev->fbvar_new.bits_per_pixel != bpp ||
  87                         fbdev->fbvar_new.xres != w ||
  88                         fbdev->fbvar_new.yres != h ||
  89                         fbdev->fbvar_new.xres_virtual != w_total||
  90                         fbdev->fbvar_new.yres_virtual < h_total ||
  91                         fbdev->fbvar_new.xoffset != left_border ||
  92                         fbdev->buffer_count != buffer_cnt)
  93         {
  94                 if (fbdev->fbvar_new.bits_per_pixel != bpp ||
  95                                 w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
  96                         printf(PFX "switching to %dx%d@%d\n", w, h, bpp);
  97
  98                 fbdev->fbvar_new.xres = w;
  99                 fbdev->fbvar_new.yres = h;
 100                 fbdev->fbvar_new.xres_virtual = w_total;
 101                 fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
 102                 fbdev->fbvar_new.xoffset = left_border;
 103                 fbdev->fbvar_new.yoffset = top_border;
 104                 fbdev->fbvar_new.bits_per_pixel = bpp;
 105                 fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
 106                 fbdev->buffer_count = buffer_cnt;
 107                 fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;
 108
 109                 // seems to help a bit to avoid glitches
 110                 vout_fbdev_wait_vsync(fbdev);
 111
 112                 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
 113                 if (ret == -1) {
 114                         // retry with no multibuffering
 115                         fbdev->fbvar_new.yres_virtual = h_total;
 116                         ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
 117                         if (ret == -1) {
 118                                 perror(PFX "FBIOPUT_VSCREENINFO ioctl");
 119                                 return NULL;
 120                         }
 121                         fbdev->buffer_count = 1;
 122                         fbdev->buffer_write = 0;
 123                         fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
 124                                         "multibuffering disabled\n");
 125                 }
 126
 127         }
 128
 129         fbdev->fb_size = w_total * h_total * bpp / 8;
 130         fbdev->top_border = top_border;
 131         fbdev->bottom_border = bottom_border;
 132
 133         mem_size = fbdev->fb_size * fbdev->buffer_count;
 134         if (fbdev->mem_size >= mem_size)
 135                 goto out;
 136
 137         if (fbdev->mem != NULL)
 138                 munmap(fbdev->mem, fbdev->mem_size);
 139
 140         fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
 141         if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
 142                 fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
 143                 fbdev->buffer_count = 1;
 144                 fbdev->buffer_write = 0;
 145                 mem_size = fbdev->fb_size;
 146                 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
 147         }
 148         if (fbdev->mem == MAP_FAILED) {
 149                 fbdev->mem = NULL;
 150                 fbdev->mem_size = 0;
 151                 perror(PFX "mmap framebuffer");
 152                 return NULL;
 153         }
 154
 155         fbdev->mem_size = mem_size;
 156
 157 out:
 158         return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
 159 }
 160
 161 void vout_fbdev_clear(struct vout_fbdev *fbdev)
 162 {
 163         memset(fbdev->mem, 0, fbdev->mem_size);
 164 }
 165
 166 void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
 167 {
 168         int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
 169         int i;
 170
 171         if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
 172                 count = fbdev->top_border + fbdev->fbvar_new.yres - y;
 173
 174         if (y >= 0 && count > 0)
 175                 for (i = 0; i < fbdev->buffer_count; i++)
 176                         memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
 177 }
 178
 179 int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
 180 {
 181         return fbdev->fd;
 182 }
 183
 184 void *vout_fbdev_get_active_mem(struct vout_fbdev *fbdev)
 185 {
 186         int i;
 187
 188         i = fbdev->buffer_write - 1;
 189         if (i < 0)
 190                 i = fbdev->buffer_count - 1;
 191
 192         return (char *)fbdev->mem + fbdev->fb_size * i;
 193 }
 194
 195 struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
 196 {
 197         struct vout_fbdev *fbdev;
 198         int req_w, req_h;
 199         void *pret;
 200         int ret;
 201
 202         fbdev = calloc(1, sizeof(*fbdev));
 203         if (fbdev == NULL)
 204                 return NULL;
 205
 206         fbdev->fd = open(fbdev_name, O_RDWR);
 207         if (fbdev->fd == -1) {
 208                 fprintf(stderr, PFX "%s: ", fbdev_name);
 209                 perror("open");
 210                 goto fail_open;
 211         }
 212
 213         ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
 214         if (ret == -1) {
 215                 perror(PFX "FBIOGET_VSCREENINFO ioctl");
 216                 goto fail;
 217         }
 218
 219         fbdev->fbvar_new = fbdev->fbvar_old;
 220
 221         req_w = fbdev->fbvar_new.xres;
 222         if (*w != 0)
 223                 req_w = *w;
 224         req_h = fbdev->fbvar_new.yres;
 225         if (*h != 0)
 226                 req_h = *h;
 227
 228         pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
 229         if (pret == NULL)
 230                 goto fail;
 231
 232         printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
 233                 fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
 234         *w = fbdev->fbvar_new.xres;
 235         *h = fbdev->fbvar_new.yres;
 236
 237         memset(fbdev->mem, 0, fbdev->mem_size);
 238
 239         // some checks
 240         // screen was unblanked by vout_fbdev_resize(), so vsync should work
 241         // first try pandora's adaptive vsync hack, then the default one
 242         ret = 0;
 243         ret = ioctl(fbdev->fd, OMAPFB_WAITFORVSYNC_FRAME, &ret);
 244         if (ret == 0)
 245                 fbdev->vsync_ioctl = OMAPFB_WAITFORVSYNC_FRAME;
 246         if (ret != 0) {
 247                 ret = 0;
 248                 ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
 249                 if (ret == 0)
 250                         fbdev->vsync_ioctl = FBIO_WAITFORVSYNC;
 251         }
 252         if (ret != 0)
 253                 fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");
 254
 255         if (fbdev->buffer_count > 1) {
 256                 fbdev->buffer_write = 0;
 257                 fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
 258                 ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
 259                 if (ret != 0) {
 260                         fbdev->buffer_count = 1;
 261                         fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
 262                 }
 263         }
 264
 265         printf("fbdev initialized.\n");
 266         return fbdev;
 267
 268 fail:
 269         close(fbdev->fd);
 270 fail_open:
 271         free(fbdev);
 272         return NULL;
 273 }
 274
 275 static void vout_fbdev_release(struct vout_fbdev *fbdev)
 276 {
 277         ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
 278         if (fbdev->mem != MAP_FAILED)
 279                 munmap(fbdev->mem, fbdev->mem_size);
 280         fbdev->mem = NULL;
 281 }
 282
 283 int vout_fbdev_save(struct vout_fbdev *fbdev)
 284 {
 285         void *tmp;
 286
 287         if (fbdev == NULL || fbdev->mem == NULL || fbdev->mem == MAP_FAILED) {
 288                 fprintf(stderr, PFX "bad args for save\n");
 289                 return -1;
 290         }
 291
 292         if (fbdev->mem_saved_size < fbdev->mem_size) {
 293                 tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
 294                 if (tmp == NULL)
 295                         return -1;
 296                 fbdev->mem_saved = tmp;
 297         }
 298         memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
 299         fbdev->mem_saved_size = fbdev->mem_size;
 300
 301         vout_fbdev_release(fbdev);
 302         return 0;
 303 }
 304
 305 int vout_fbdev_restore(struct vout_fbdev *fbdev)
 306 {
 307         int ret;
 308
 309         if (fbdev == NULL || fbdev->mem != NULL) {
 310                 fprintf(stderr, PFX "bad args/state for restore\n");
 311                 return -1;
 312         }
 313
 314         fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
 315         if (fbdev->mem == MAP_FAILED) {
 316                 perror(PFX "restore: memory restore failed");
 317                 return -1;
 318         }
 319         memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);
 320
 321         ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
 322         if (ret == -1) {
 323                 perror(PFX "restore: FBIOPUT_VSCREENINFO");
 324                 return -1;
 325         }
 326
 327         return 0;
 328 }
 329
 330 void vout_fbdev_finish(struct vout_fbdev *fbdev)
 331 {
 332         vout_fbdev_release(fbdev);
 333         if (fbdev->fd >= 0)
 334                 close(fbdev->fd);
 335         fbdev->fd = -1;
 336         free(fbdev);
 337 }
 338