drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c

   1 /*
   2  * linux/drivers/video/omap2/omapfb-sysfs.c
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * Some code and ideas taken from drivers/video/omap/ driver
   8  * by Imre Deak.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <linux/fb.h>
  24 #include <linux/sysfs.h>
  25 #include <linux/device.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/kernel.h>
  29 #include <linux/mm.h>
  30 #include <linux/omapfb.h>
  31
  32 #include <video/omapdss.h>
  33 #include <video/omapvrfb.h>
  34
  35 #include "omapfb.h"
  36
  37 static ssize_t show_rotate_type(struct device *dev,
  38                 struct device_attribute *attr, char *buf)
  39 {
  40         struct fb_info *fbi = dev_get_drvdata(dev);
  41         struct omapfb_info *ofbi = FB2OFB(fbi);
  42
  43         return snprintf(buf, PAGE_SIZE, "%d\n", ofbi->rotation_type);
  44 }
  45
  46 static ssize_t store_rotate_type(struct device *dev,
  47                 struct device_attribute *attr,
  48                 const char *buf, size_t count)
  49 {
  50         struct fb_info *fbi = dev_get_drvdata(dev);
  51         struct omapfb_info *ofbi = FB2OFB(fbi);
  52         struct omapfb2_mem_region *rg;
  53         int rot_type;
  54         int r;
  55
  56         r = kstrtoint(buf, 0, &rot_type);
  57         if (r)
  58                 return r;
  59
  60         if (rot_type != OMAP_DSS_ROT_DMA && rot_type != OMAP_DSS_ROT_VRFB)
  61                 return -EINVAL;
  62
  63         if (!lock_fb_info(fbi))
  64                 return -ENODEV;
  65
  66         r = 0;
  67         if (rot_type == ofbi->rotation_type)
  68                 goto out;
  69
  70         rg = omapfb_get_mem_region(ofbi->region);
  71
  72         if (rg->size) {
  73                 r = -EBUSY;
  74                 goto put_region;
  75         }
  76
  77         ofbi->rotation_type = rot_type;
  78
  79         /*
  80          * Since the VRAM for this FB is not allocated at the moment we don't
  81          * need to do any further parameter checking at this point.
  82          */
  83 put_region:
  84         omapfb_put_mem_region(rg);
  85 out:
  86         unlock_fb_info(fbi);
  87
  88         return r ? r : count;
  89 }
  90
  91
  92 static ssize_t show_mirror(struct device *dev,
  93                 struct device_attribute *attr, char *buf)
  94 {
  95         struct fb_info *fbi = dev_get_drvdata(dev);
  96         struct omapfb_info *ofbi = FB2OFB(fbi);
  97
  98         return snprintf(buf, PAGE_SIZE, "%d\n", ofbi->mirror);
  99 }
 100
 101 static ssize_t store_mirror(struct device *dev,
 102                 struct device_attribute *attr,
 103                 const char *buf, size_t count)
 104 {
 105         struct fb_info *fbi = dev_get_drvdata(dev);
 106         struct omapfb_info *ofbi = FB2OFB(fbi);
 107         bool mirror;
 108         int r;
 109         struct fb_var_screeninfo new_var;
 110
 111         r = strtobool(buf, &mirror);
 112         if (r)
 113                 return r;
 114
 115         if (!lock_fb_info(fbi))
 116                 return -ENODEV;
 117
 118         ofbi->mirror = mirror;
 119
 120         omapfb_get_mem_region(ofbi->region);
 121
 122         memcpy(&new_var, &fbi->var, sizeof(new_var));
 123         r = check_fb_var(fbi, &new_var);
 124         if (r)
 125                 goto out;
 126         memcpy(&fbi->var, &new_var, sizeof(fbi->var));
 127
 128         set_fb_fix(fbi);
 129
 130         r = omapfb_apply_changes(fbi, 0);
 131         if (r)
 132                 goto out;
 133
 134         r = count;
 135 out:
 136         omapfb_put_mem_region(ofbi->region);
 137
 138         unlock_fb_info(fbi);
 139
 140         return r;
 141 }
 142
 143 static ssize_t show_overlays(struct device *dev,
 144                 struct device_attribute *attr, char *buf)
 145 {
 146         struct fb_info *fbi = dev_get_drvdata(dev);
 147         struct omapfb_info *ofbi = FB2OFB(fbi);
 148         struct omapfb2_device *fbdev = ofbi->fbdev;
 149         ssize_t l = 0;
 150         int t;
 151
 152         if (!lock_fb_info(fbi))
 153                 return -ENODEV;
 154         omapfb_lock(fbdev);
 155
 156         for (t = 0; t < ofbi->num_overlays; t++) {
 157                 struct omap_overlay *ovl = ofbi->overlays[t];
 158                 int ovlnum;
 159
 160                 for (ovlnum = 0; ovlnum < fbdev->num_overlays; ++ovlnum)
 161                         if (ovl == fbdev->overlays[ovlnum])
 162                                 break;
 163
 164                 l += snprintf(buf + l, PAGE_SIZE - l, "%s%d",
 165                                 t == 0 ? "" : ",", ovlnum);
 166         }
 167
 168         l += snprintf(buf + l, PAGE_SIZE - l, "\n");
 169
 170         omapfb_unlock(fbdev);
 171         unlock_fb_info(fbi);
 172
 173         return l;
 174 }
 175
 176 static struct omapfb_info *get_overlay_fb(struct omapfb2_device *fbdev,
 177                 struct omap_overlay *ovl)
 178 {
 179         int i, t;
 180
 181         for (i = 0; i < fbdev->num_fbs; i++) {
 182                 struct omapfb_info *ofbi = FB2OFB(fbdev->fbs[i]);
 183
 184                 for (t = 0; t < ofbi->num_overlays; t++) {
 185                         if (ofbi->overlays[t] == ovl)
 186                                 return ofbi;
 187                 }
 188         }
 189
 190         return NULL;
 191 }
 192
 193 static ssize_t store_overlays(struct device *dev, struct device_attribute *attr,
 194                 const char *buf, size_t count)
 195 {
 196         struct fb_info *fbi = dev_get_drvdata(dev);
 197         struct omapfb_info *ofbi = FB2OFB(fbi);
 198         struct omapfb2_device *fbdev = ofbi->fbdev;
 199         struct omap_overlay *ovls[OMAPFB_MAX_OVL_PER_FB];
 200         struct omap_overlay *ovl;
 201         int num_ovls, r, i;
 202         int len;
 203         bool added = false;
 204
 205         num_ovls = 0;
 206
 207         len = strlen(buf);
 208         if (buf[len - 1] == '\n')
 209                 len = len - 1;
 210
 211         if (!lock_fb_info(fbi))
 212                 return -ENODEV;
 213         omapfb_lock(fbdev);
 214
 215         if (len > 0) {
 216                 char *p = (char *)buf;
 217                 int ovlnum;
 218
 219                 while (p < buf + len) {
 220                         int found;
 221                         if (num_ovls == OMAPFB_MAX_OVL_PER_FB) {
 222                                 r = -EINVAL;
 223                                 goto out;
 224                         }
 225
 226                         ovlnum = simple_strtoul(p, &p, 0);
 227                         if (ovlnum > fbdev->num_overlays) {
 228                                 r = -EINVAL;
 229                                 goto out;
 230                         }
 231
 232                         found = 0;
 233                         for (i = 0; i < num_ovls; ++i) {
 234                                 if (ovls[i] == fbdev->overlays[ovlnum]) {
 235                                         found = 1;
 236                                         break;
 237                                 }
 238                         }
 239
 240                         if (!found)
 241                                 ovls[num_ovls++] = fbdev->overlays[ovlnum];
 242
 243                         p++;
 244                 }
 245         }
 246
 247         for (i = 0; i < num_ovls; ++i) {
 248                 struct omapfb_info *ofbi2 = get_overlay_fb(fbdev, ovls[i]);
 249                 if (ofbi2 && ofbi2 != ofbi) {
 250                         dev_err(fbdev->dev, "overlay already in use\n");
 251                         r = -EINVAL;
 252                         goto out;
 253                 }
 254         }
 255
 256         /* detach unused overlays */
 257         for (i = 0; i < ofbi->num_overlays; ++i) {
 258                 int t, found;
 259
 260                 ovl = ofbi->overlays[i];
 261
 262                 found = 0;
 263
 264                 for (t = 0; t < num_ovls; ++t) {
 265                         if (ovl == ovls[t]) {
 266                                 found = 1;
 267                                 break;
 268                         }
 269                 }
 270
 271                 if (found)
 272                         continue;
 273
 274                 DBG("detaching %d\n", ofbi->overlays[i]->id);
 275
 276                 omapfb_get_mem_region(ofbi->region);
 277
 278                 omapfb_overlay_enable(ovl, 0);
 279
 280                 if (ovl->manager)
 281                         ovl->manager->apply(ovl->manager);
 282
 283                 omapfb_put_mem_region(ofbi->region);
 284
 285                 for (t = i + 1; t < ofbi->num_overlays; t++) {
 286                         ofbi->rotation[t-1] = ofbi->rotation[t];
 287                         ofbi->overlays[t-1] = ofbi->overlays[t];
 288                 }
 289
 290                 ofbi->num_overlays--;
 291                 i--;
 292         }
 293
 294         for (i = 0; i < num_ovls; ++i) {
 295                 int t, found;
 296
 297                 ovl = ovls[i];
 298
 299                 found = 0;
 300
 301                 for (t = 0; t < ofbi->num_overlays; ++t) {
 302                         if (ovl == ofbi->overlays[t]) {
 303                                 found = 1;
 304                                 break;
 305                         }
 306                 }
 307
 308                 if (found)
 309                         continue;
 310                 ofbi->rotation[ofbi->num_overlays] = 0;
 311                 ofbi->overlays[ofbi->num_overlays++] = ovl;
 312
 313                 added = true;
 314         }
 315
 316         if (added) {
 317                 omapfb_get_mem_region(ofbi->region);
 318
 319                 r = omapfb_apply_changes(fbi, 0);
 320
 321                 omapfb_put_mem_region(ofbi->region);
 322
 323                 if (r)
 324                         goto out;
 325         }
 326
 327         r = count;
 328 out:
 329         omapfb_unlock(fbdev);
 330         unlock_fb_info(fbi);
 331
 332         return r;
 333 }
 334
 335 static ssize_t show_overlays_rotate(struct device *dev,
 336                 struct device_attribute *attr, char *buf)
 337 {
 338         struct fb_info *fbi = dev_get_drvdata(dev);
 339         struct omapfb_info *ofbi = FB2OFB(fbi);
 340         ssize_t l = 0;
 341         int t;
 342
 343         if (!lock_fb_info(fbi))
 344                 return -ENODEV;
 345
 346         for (t = 0; t < ofbi->num_overlays; t++) {
 347                 l += snprintf(buf + l, PAGE_SIZE - l, "%s%d",
 348                                 t == 0 ? "" : ",", ofbi->rotation[t]);
 349         }
 350
 351         l += snprintf(buf + l, PAGE_SIZE - l, "\n");
 352
 353         unlock_fb_info(fbi);
 354
 355         return l;
 356 }
 357
 358 static ssize_t store_overlays_rotate(struct device *dev,
 359                 struct device_attribute *attr, const char *buf, size_t count)
 360 {
 361         struct fb_info *fbi = dev_get_drvdata(dev);
 362         struct omapfb_info *ofbi = FB2OFB(fbi);
 363         int num_ovls = 0, r, i;
 364         int len;
 365         bool changed = false;
 366         u8 rotation[OMAPFB_MAX_OVL_PER_FB];
 367
 368         len = strlen(buf);
 369         if (buf[len - 1] == '\n')
 370                 len = len - 1;
 371
 372         if (!lock_fb_info(fbi))
 373                 return -ENODEV;
 374
 375         if (len > 0) {
 376                 char *p = (char *)buf;
 377
 378                 while (p < buf + len) {
 379                         int rot;
 380
 381                         if (num_ovls == ofbi->num_overlays) {
 382                                 r = -EINVAL;
 383                                 goto out;
 384                         }
 385
 386                         rot = simple_strtoul(p, &p, 0);
 387                         if (rot < 0 || rot > 3) {
 388                                 r = -EINVAL;
 389                                 goto out;
 390                         }
 391
 392                         if (ofbi->rotation[num_ovls] != rot)
 393                                 changed = true;
 394
 395                         rotation[num_ovls++] = rot;
 396
 397                         p++;
 398                 }
 399         }
 400
 401         if (num_ovls != ofbi->num_overlays) {
 402                 r = -EINVAL;
 403                 goto out;
 404         }
 405
 406         if (changed) {
 407                 for (i = 0; i < num_ovls; ++i)
 408                         ofbi->rotation[i] = rotation[i];
 409
 410                 omapfb_get_mem_region(ofbi->region);
 411
 412                 r = omapfb_apply_changes(fbi, 0);
 413
 414                 omapfb_put_mem_region(ofbi->region);
 415
 416                 if (r)
 417                         goto out;
 418
 419                 /* FIXME error handling? */
 420         }
 421
 422         r = count;
 423 out:
 424         unlock_fb_info(fbi);
 425
 426         return r;
 427 }
 428
 429 static ssize_t show_size(struct device *dev,
 430                 struct device_attribute *attr, char *buf)
 431 {
 432         struct fb_info *fbi = dev_get_drvdata(dev);
 433         struct omapfb_info *ofbi = FB2OFB(fbi);
 434
 435         return snprintf(buf, PAGE_SIZE, "%lu\n", ofbi->region->size);
 436 }
 437
 438 static ssize_t store_size(struct device *dev, struct device_attribute *attr,
 439                 const char *buf, size_t count)
 440 {
 441         struct fb_info *fbi = dev_get_drvdata(dev);
 442         struct omapfb_info *ofbi = FB2OFB(fbi);
 443         struct omapfb2_device *fbdev = ofbi->fbdev;
 444         struct omap_dss_device *display = fb2display(fbi);
 445         struct omapfb2_mem_region *rg;
 446         unsigned long size;
 447         int r;
 448         int i;
 449
 450         r = kstrtoul(buf, 0, &size);
 451         if (r)
 452                 return r;
 453
 454         size = PAGE_ALIGN(size);
 455
 456         if (!lock_fb_info(fbi))
 457                 return -ENODEV;
 458
 459         if (display && display->driver->sync)
 460                 display->driver->sync(display);
 461
 462         rg = ofbi->region;
 463
 464         down_write_nested(&rg->lock, rg->id);
 465         atomic_inc(&rg->lock_count);
 466
 467         if (atomic_read(&rg->map_count)) {
 468                 r = -EBUSY;
 469                 goto out;
 470         }
 471
 472         for (i = 0; i < fbdev->num_fbs; i++) {
 473                 struct omapfb_info *ofbi2 = FB2OFB(fbdev->fbs[i]);
 474                 int j;
 475
 476                 if (ofbi2->region != rg)
 477                         continue;
 478
 479                 for (j = 0; j < ofbi2->num_overlays; j++) {
 480                         struct omap_overlay *ovl;
 481                         ovl = ofbi2->overlays[j];
 482                         if (ovl->is_enabled(ovl)) {
 483                                 r = -EBUSY;
 484                                 goto out;
 485                         }
 486                 }
 487         }
 488
 489         if (size != ofbi->region->size) {
 490                 r = omapfb_realloc_fbmem(fbi, size, ofbi->region->type);
 491                 if (r) {
 492                         dev_err(dev, "realloc fbmem failed\n");
 493                         goto out;
 494                 }
 495         }
 496
 497         r = count;
 498 out:
 499         atomic_dec(&rg->lock_count);
 500         up_write(&rg->lock);
 501
 502         unlock_fb_info(fbi);
 503
 504         return r;
 505 }
 506
 507 static ssize_t show_phys(struct device *dev,
 508                 struct device_attribute *attr, char *buf)
 509 {
 510         struct fb_info *fbi = dev_get_drvdata(dev);
 511         struct omapfb_info *ofbi = FB2OFB(fbi);
 512
 513         return snprintf(buf, PAGE_SIZE, "%0x\n", ofbi->region->paddr);
 514 }
 515
 516 static ssize_t show_virt(struct device *dev,
 517                 struct device_attribute *attr, char *buf)
 518 {
 519         struct fb_info *fbi = dev_get_drvdata(dev);
 520         struct omapfb_info *ofbi = FB2OFB(fbi);
 521
 522         return snprintf(buf, PAGE_SIZE, "%p\n", ofbi->region->vaddr);
 523 }
 524
 525 static ssize_t show_upd_mode(struct device *dev,
 526                 struct device_attribute *attr, char *buf)
 527 {
 528         struct fb_info *fbi = dev_get_drvdata(dev);
 529         enum omapfb_update_mode mode;
 530         int r;
 531
 532         r = omapfb_get_update_mode(fbi, &mode);
 533
 534         if (r)
 535                 return r;
 536
 537         return snprintf(buf, PAGE_SIZE, "%u\n", (unsigned)mode);
 538 }
 539
 540 static ssize_t store_upd_mode(struct device *dev, struct device_attribute *attr,
 541                 const char *buf, size_t count)
 542 {
 543         struct fb_info *fbi = dev_get_drvdata(dev);
 544         unsigned mode;
 545         int r;
 546
 547         r = kstrtouint(buf, 0, &mode);
 548         if (r)
 549                 return r;
 550
 551         r = omapfb_set_update_mode(fbi, mode);
 552         if (r)
 553                 return r;
 554
 555         return count;
 556 }
 557
 558 static struct device_attribute omapfb_attrs[] = {
 559         __ATTR(rotate_type, S_IRUGO | S_IWUSR, show_rotate_type,
 560                         store_rotate_type),
 561         __ATTR(mirror, S_IRUGO | S_IWUSR, show_mirror, store_mirror),
 562         __ATTR(size, S_IRUGO | S_IWUSR, show_size, store_size),
 563         __ATTR(overlays, S_IRUGO | S_IWUSR, show_overlays, store_overlays),
 564         __ATTR(overlays_rotate, S_IRUGO | S_IWUSR, show_overlays_rotate,
 565                         store_overlays_rotate),
 566         __ATTR(phys_addr, S_IRUGO, show_phys, NULL),
 567         __ATTR(virt_addr, S_IRUGO, show_virt, NULL),
 568         __ATTR(update_mode, S_IRUGO | S_IWUSR, show_upd_mode, store_upd_mode),
 569 };
 570
 571 int omapfb_create_sysfs(struct omapfb2_device *fbdev)
 572 {
 573         int i;
 574         int r;
 575
 576         DBG("create sysfs for fbs\n");
 577         for (i = 0; i < fbdev->num_fbs; i++) {
 578                 int t;
 579                 for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++) {
 580                         r = device_create_file(fbdev->fbs[i]->dev,
 581                                         &omapfb_attrs[t]);
 582
 583                         if (r) {
 584                                 dev_err(fbdev->dev, "failed to create sysfs "
 585                                                 "file\n");
 586                                 return r;
 587                         }
 588                 }
 589         }
 590
 591         return 0;
 592 }
 593
 594 void omapfb_remove_sysfs(struct omapfb2_device *fbdev)
 595 {
 596         int i, t;
 597
 598         DBG("remove sysfs for fbs\n");
 599         for (i = 0; i < fbdev->num_fbs; i++) {
 600                 for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++)
 601                         device_remove_file(fbdev->fbs[i]->dev,
 602                                         &omapfb_attrs[t]);
 603         }
 604 }
 605