drivers/video/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 <plat/display.h>
  33 #include <plat/vrfb.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         enum omap_dss_rotation_type rot_type;
  54         int r;
  55
  56         rot_type = simple_strtoul(buf, NULL, 0);
  57
  58         if (rot_type != OMAP_DSS_ROT_DMA && rot_type != OMAP_DSS_ROT_VRFB)
  59                 return -EINVAL;
  60
  61         if (!lock_fb_info(fbi))
  62                 return -ENODEV;
  63
  64         r = 0;
  65         if (rot_type == ofbi->rotation_type)
  66                 goto out;
  67
  68         rg = omapfb_get_mem_region(ofbi->region);
  69
  70         if (rg->size) {
  71                 r = -EBUSY;
  72                 goto put_region;
  73         }
  74
  75         ofbi->rotation_type = rot_type;
  76
  77         /*
  78          * Since the VRAM for this FB is not allocated at the moment we don't
  79          * need to do any further parameter checking at this point.
  80          */
  81 put_region:
  82         omapfb_put_mem_region(rg);
  83 out:
  84         unlock_fb_info(fbi);
  85
  86         return r ? r : count;
  87 }
  88
  89
  90 static ssize_t show_mirror(struct device *dev,
  91                 struct device_attribute *attr, char *buf)
  92 {
  93         struct fb_info *fbi = dev_get_drvdata(dev);
  94         struct omapfb_info *ofbi = FB2OFB(fbi);
  95
  96         return snprintf(buf, PAGE_SIZE, "%d\n", ofbi->mirror);
  97 }
  98
  99 static ssize_t store_mirror(struct device *dev,
 100                 struct device_attribute *attr,
 101                 const char *buf, size_t count)
 102 {
 103         struct fb_info *fbi = dev_get_drvdata(dev);
 104         struct omapfb_info *ofbi = FB2OFB(fbi);
 105         unsigned long mirror;
 106         int r;
 107         struct fb_var_screeninfo new_var;
 108
 109         mirror = simple_strtoul(buf, NULL, 0);
 110
 111         if (mirror != 0 && mirror != 1)
 112                 return -EINVAL;
 113
 114         if (!lock_fb_info(fbi))
 115                 return -ENODEV;
 116
 117         ofbi->mirror = mirror;
 118
 119         omapfb_get_mem_region(ofbi->region);
 120
 121         memcpy(&new_var, &fbi->var, sizeof(new_var));
 122         r = check_fb_var(fbi, &new_var);
 123         if (r)
 124                 goto out;
 125         memcpy(&fbi->var, &new_var, sizeof(fbi->var));
 126
 127         set_fb_fix(fbi);
 128
 129         r = omapfb_apply_changes(fbi, 0);
 130         if (r)
 131                 goto out;
 132
 133         r = count;
 134 out:
 135         omapfb_put_mem_region(ofbi->region);
 136
 137         unlock_fb_info(fbi);
 138
 139         return r;
 140 }
 141
 142 static ssize_t show_overlays(struct device *dev,
 143                 struct device_attribute *attr, char *buf)
 144 {
 145         struct fb_info *fbi = dev_get_drvdata(dev);
 146         struct omapfb_info *ofbi = FB2OFB(fbi);
 147         struct omapfb2_device *fbdev = ofbi->fbdev;
 148         ssize_t l = 0;
 149         int t;
 150
 151         if (!lock_fb_info(fbi))
 152                 return -ENODEV;
 153         omapfb_lock(fbdev);
 154
 155         for (t = 0; t < ofbi->num_overlays; t++) {
 156                 struct omap_overlay *ovl = ofbi->overlays[t];
 157                 int ovlnum;
 158
 159                 for (ovlnum = 0; ovlnum < fbdev->num_overlays; ++ovlnum)
 160                         if (ovl == fbdev->overlays[ovlnum])
 161                                 break;
 162
 163                 l += snprintf(buf + l, PAGE_SIZE - l, "%s%d",
 164                                 t == 0 ? "" : ",", ovlnum);
 165         }
 166
 167         l += snprintf(buf + l, PAGE_SIZE - l, "\n");
 168
 169         omapfb_unlock(fbdev);
 170         unlock_fb_info(fbi);
 171
 172         return l;
 173 }
 174
 175 static struct omapfb_info *get_overlay_fb(struct omapfb2_device *fbdev,
 176                 struct omap_overlay *ovl)
 177 {
 178         int i, t;
 179
 180         for (i = 0; i < fbdev->num_fbs; i++) {
 181                 struct omapfb_info *ofbi = FB2OFB(fbdev->fbs[i]);
 182
 183                 for (t = 0; t < ofbi->num_overlays; t++) {
 184                         if (ofbi->overlays[t] == ovl)
 185                                 return ofbi;
 186                 }
 187         }
 188
 189         return NULL;
 190 }
 191
 192 static ssize_t store_overlays(struct device *dev, struct device_attribute *attr,
 193                 const char *buf, size_t count)
 194 {
 195         struct fb_info *fbi = dev_get_drvdata(dev);
 196         struct omapfb_info *ofbi = FB2OFB(fbi);
 197         struct omapfb2_device *fbdev = ofbi->fbdev;
 198         struct omap_overlay *ovls[OMAPFB_MAX_OVL_PER_FB];
 199         struct omap_overlay *ovl;
 200         int num_ovls, r, i;
 201         int len;
 202         bool added = false;
 203
 204         num_ovls = 0;
 205
 206         len = strlen(buf);
 207         if (buf[len - 1] == '\n')
 208                 len = len - 1;
 209
 210         if (!lock_fb_info(fbi))
 211                 return -ENODEV;
 212         omapfb_lock(fbdev);
 213
 214         if (len > 0) {
 215                 char *p = (char *)buf;
 216                 int ovlnum;
 217
 218                 while (p < buf + len) {
 219                         int found;
 220                         if (num_ovls == OMAPFB_MAX_OVL_PER_FB) {
 221                                 r = -EINVAL;
 222                                 goto out;
 223                         }
 224
 225                         ovlnum = simple_strtoul(p, &p, 0);
 226                         if (ovlnum > fbdev->num_overlays) {
 227                                 r = -EINVAL;
 228                                 goto out;
 229                         }
 230
 231                         found = 0;
 232                         for (i = 0; i < num_ovls; ++i) {
 233                                 if (ovls[i] == fbdev->overlays[ovlnum]) {
 234                                         found = 1;
 235                                         break;
 236                                 }
 237                         }
 238
 239                         if (!found)
 240                                 ovls[num_ovls++] = fbdev->overlays[ovlnum];
 241
 242                         p++;
 243                 }
 244         }
 245
 246         for (i = 0; i < num_ovls; ++i) {
 247                 struct omapfb_info *ofbi2 = get_overlay_fb(fbdev, ovls[i]);
 248                 if (ofbi2 && ofbi2 != ofbi) {
 249                         dev_err(fbdev->dev, "overlay already in use\n");
 250                         r = -EINVAL;
 251                         goto out;
 252                 }
 253         }
 254
 255         /* detach unused overlays */
 256         for (i = 0; i < ofbi->num_overlays; ++i) {
 257                 int t, found;
 258
 259                 ovl = ofbi->overlays[i];
 260
 261                 found = 0;
 262
 263                 for (t = 0; t < num_ovls; ++t) {
 264                         if (ovl == ovls[t]) {
 265                                 found = 1;
 266                                 break;
 267                         }
 268                 }
 269
 270                 if (found)
 271                         continue;
 272
 273                 DBG("detaching %d\n", ofbi->overlays[i]->id);
 274
 275                 omapfb_get_mem_region(ofbi->region);
 276
 277                 omapfb_overlay_enable(ovl, 0);
 278
 279                 if (ovl->manager)
 280                         ovl->manager->apply(ovl->manager);
 281
 282                 omapfb_put_mem_region(ofbi->region);
 283
 284                 for (t = i + 1; t < ofbi->num_overlays; t++) {
 285                         ofbi->rotation[t-1] = ofbi->rotation[t];
 286                         ofbi->overlays[t-1] = ofbi->overlays[t];
 287                 }
 288
 289                 ofbi->num_overlays--;
 290                 i--;
 291         }
 292
 293         for (i = 0; i < num_ovls; ++i) {
 294                 int t, found;
 295
 296                 ovl = ovls[i];
 297
 298                 found = 0;
 299
 300                 for (t = 0; t < ofbi->num_overlays; ++t) {
 301                         if (ovl == ofbi->overlays[t]) {
 302                                 found = 1;
 303                                 break;
 304                         }
 305                 }
 306
 307                 if (found)
 308                         continue;
 309                 ofbi->rotation[ofbi->num_overlays] = 0;
 310                 ofbi->overlays[ofbi->num_overlays++] = ovl;
 311
 312                 added = true;
 313         }
 314
 315         if (added) {
 316                 omapfb_get_mem_region(ofbi->region);
 317
 318                 r = omapfb_apply_changes(fbi, 0);
 319
 320                 omapfb_put_mem_region(ofbi->region);
 321
 322                 if (r)
 323                         goto out;
 324         }
 325
 326         r = count;
 327 out:
 328         omapfb_unlock(fbdev);
 329         unlock_fb_info(fbi);
 330
 331         return r;
 332 }
 333
 334 static ssize_t show_overlays_rotate(struct device *dev,
 335                 struct device_attribute *attr, char *buf)
 336 {
 337         struct fb_info *fbi = dev_get_drvdata(dev);
 338         struct omapfb_info *ofbi = FB2OFB(fbi);
 339         ssize_t l = 0;
 340         int t;
 341
 342         if (!lock_fb_info(fbi))
 343                 return -ENODEV;
 344
 345         for (t = 0; t < ofbi->num_overlays; t++) {
 346                 l += snprintf(buf + l, PAGE_SIZE - l, "%s%d",
 347                                 t == 0 ? "" : ",", ofbi->rotation[t]);
 348         }
 349
 350         l += snprintf(buf + l, PAGE_SIZE - l, "\n");
 351
 352         unlock_fb_info(fbi);
 353
 354         return l;
 355 }
 356
 357 static ssize_t store_overlays_rotate(struct device *dev,
 358                 struct device_attribute *attr, const char *buf, size_t count)
 359 {
 360         struct fb_info *fbi = dev_get_drvdata(dev);
 361         struct omapfb_info *ofbi = FB2OFB(fbi);
 362         int num_ovls = 0, r, i;
 363         int len;
 364         bool changed = false;
 365         u8 rotation[OMAPFB_MAX_OVL_PER_FB];
 366
 367         len = strlen(buf);
 368         if (buf[len - 1] == '\n')
 369                 len = len - 1;
 370
 371         if (!lock_fb_info(fbi))
 372                 return -ENODEV;
 373
 374         if (len > 0) {
 375                 char *p = (char *)buf;
 376
 377                 while (p < buf + len) {
 378                         int rot;
 379
 380                         if (num_ovls == ofbi->num_overlays) {
 381                                 r = -EINVAL;
 382                                 goto out;
 383                         }
 384
 385                         rot = simple_strtoul(p, &p, 0);
 386                         if (rot < 0 || rot > 3) {
 387                                 r = -EINVAL;
 388                                 goto out;
 389                         }
 390
 391                         if (ofbi->rotation[num_ovls] != rot)
 392                                 changed = true;
 393
 394                         rotation[num_ovls++] = rot;
 395
 396                         p++;
 397                 }
 398         }
 399
 400         if (num_ovls != ofbi->num_overlays) {
 401                 r = -EINVAL;
 402                 goto out;
 403         }
 404
 405         if (changed) {
 406                 for (i = 0; i < num_ovls; ++i)
 407                         ofbi->rotation[i] = rotation[i];
 408
 409                 omapfb_get_mem_region(ofbi->region);
 410
 411                 r = omapfb_apply_changes(fbi, 0);
 412
 413                 omapfb_put_mem_region(ofbi->region);
 414
 415                 if (r)
 416                         goto out;
 417
 418                 /* FIXME error handling? */
 419         }
 420
 421         r = count;
 422 out:
 423         unlock_fb_info(fbi);
 424
 425         return r;
 426 }
 427
 428 static ssize_t show_size(struct device *dev,
 429                 struct device_attribute *attr, char *buf)
 430 {
 431         struct fb_info *fbi = dev_get_drvdata(dev);
 432         struct omapfb_info *ofbi = FB2OFB(fbi);
 433
 434         return snprintf(buf, PAGE_SIZE, "%lu\n", ofbi->region->size);
 435 }
 436
 437 static ssize_t store_size(struct device *dev, struct device_attribute *attr,
 438                 const char *buf, size_t count)
 439 {
 440         struct fb_info *fbi = dev_get_drvdata(dev);
 441         struct omapfb_info *ofbi = FB2OFB(fbi);
 442         struct omapfb2_device *fbdev = ofbi->fbdev;
 443         struct omapfb2_mem_region *rg;
 444         unsigned long size;
 445         int r;
 446         int i;
 447
 448         size = PAGE_ALIGN(simple_strtoul(buf, NULL, 0));
 449
 450         if (!lock_fb_info(fbi))
 451                 return -ENODEV;
 452
 453         rg = ofbi->region;
 454
 455         down_write_nested(&rg->lock, rg->id);
 456         atomic_inc(&rg->lock_count);
 457
 458         if (atomic_read(&rg->map_count)) {
 459                 r = -EBUSY;
 460                 goto out;
 461         }
 462
 463         for (i = 0; i < fbdev->num_fbs; i++) {
 464                 struct omapfb_info *ofbi2 = FB2OFB(fbdev->fbs[i]);
 465                 int j;
 466
 467                 if (ofbi2->region != rg)
 468                         continue;
 469
 470                 for (j = 0; j < ofbi2->num_overlays; j++) {
 471                         if (ofbi2->overlays[j]->info.enabled) {
 472                                 r = -EBUSY;
 473                                 goto out;
 474                         }
 475                 }
 476         }
 477
 478         if (size != ofbi->region->size) {
 479                 r = omapfb_realloc_fbmem(fbi, size, ofbi->region->type);
 480                 if (r) {
 481                         dev_err(dev, "realloc fbmem failed\n");
 482                         goto out;
 483                 }
 484         }
 485
 486         r = count;
 487 out:
 488         atomic_dec(&rg->lock_count);
 489         up_write(&rg->lock);
 490
 491         unlock_fb_info(fbi);
 492
 493         return r;
 494 }
 495
 496 static ssize_t show_phys(struct device *dev,
 497                 struct device_attribute *attr, char *buf)
 498 {
 499         struct fb_info *fbi = dev_get_drvdata(dev);
 500         struct omapfb_info *ofbi = FB2OFB(fbi);
 501
 502         return snprintf(buf, PAGE_SIZE, "%0x\n", ofbi->region->paddr);
 503 }
 504
 505 static ssize_t show_virt(struct device *dev,
 506                 struct device_attribute *attr, char *buf)
 507 {
 508         struct fb_info *fbi = dev_get_drvdata(dev);
 509         struct omapfb_info *ofbi = FB2OFB(fbi);
 510
 511         return snprintf(buf, PAGE_SIZE, "%p\n", ofbi->region->vaddr);
 512 }
 513
 514 static struct device_attribute omapfb_attrs[] = {
 515         __ATTR(rotate_type, S_IRUGO | S_IWUSR, show_rotate_type,
 516                         store_rotate_type),
 517         __ATTR(mirror, S_IRUGO | S_IWUSR, show_mirror, store_mirror),
 518         __ATTR(size, S_IRUGO | S_IWUSR, show_size, store_size),
 519         __ATTR(overlays, S_IRUGO | S_IWUSR, show_overlays, store_overlays),
 520         __ATTR(overlays_rotate, S_IRUGO | S_IWUSR, show_overlays_rotate,
 521                         store_overlays_rotate),
 522         __ATTR(phys_addr, S_IRUGO, show_phys, NULL),
 523         __ATTR(virt_addr, S_IRUGO, show_virt, NULL),
 524 };
 525
 526 int omapfb_create_sysfs(struct omapfb2_device *fbdev)
 527 {
 528         int i;
 529         int r;
 530
 531         DBG("create sysfs for fbs\n");
 532         for (i = 0; i < fbdev->num_fbs; i++) {
 533                 int t;
 534                 for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++) {
 535                         r = device_create_file(fbdev->fbs[i]->dev,
 536                                         &omapfb_attrs[t]);
 537
 538                         if (r) {
 539                                 dev_err(fbdev->dev, "failed to create sysfs "
 540                                                 "file\n");
 541                                 return r;
 542                         }
 543                 }
 544         }
 545
 546         return 0;
 547 }
 548
 549 void omapfb_remove_sysfs(struct omapfb2_device *fbdev)
 550 {
 551         int i, t;
 552
 553         DBG("remove sysfs for fbs\n");
 554         for (i = 0; i < fbdev->num_fbs; i++) {
 555                 for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++)
 556                         device_remove_file(fbdev->fbs[i]->dev,
 557                                         &omapfb_attrs[t]);
 558         }
 559 }
 560