drivers/video/omap2/dss/display.c

   1 /*
   2  * linux/drivers/video/omap2/dss/display.c
   3  *
   4  * Copyright (C) 2009 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 #define DSS_SUBSYS_NAME "DISPLAY"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/platform_device.h>
  29
  30 #include <video/omapdss.h>
  31 #include "dss.h"
  32 #include "dss_features.h"
  33
  34 static ssize_t display_enabled_show(struct device *dev,
  35                 struct device_attribute *attr, char *buf)
  36 {
  37         struct omap_dss_device *dssdev = to_dss_device(dev);
  38         bool enabled = dssdev->state != OMAP_DSS_DISPLAY_DISABLED;
  39
  40         return snprintf(buf, PAGE_SIZE, "%d\n", enabled);
  41 }
  42
  43 static ssize_t display_enabled_store(struct device *dev,
  44                 struct device_attribute *attr,
  45                 const char *buf, size_t size)
  46 {
  47         struct omap_dss_device *dssdev = to_dss_device(dev);
  48         int r, enabled;
  49
  50         r = kstrtoint(buf, 0, &enabled);
  51         if (r)
  52                 return r;
  53
  54         enabled = !!enabled;
  55
  56         if (enabled != (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)) {
  57                 if (enabled) {
  58                         r = dssdev->driver->enable(dssdev);
  59                         if (r)
  60                                 return r;
  61                 } else {
  62                         dssdev->driver->disable(dssdev);
  63                 }
  64         }
  65
  66         return size;
  67 }
  68
  69 static ssize_t display_tear_show(struct device *dev,
  70                 struct device_attribute *attr, char *buf)
  71 {
  72         struct omap_dss_device *dssdev = to_dss_device(dev);
  73         return snprintf(buf, PAGE_SIZE, "%d\n",
  74                         dssdev->driver->get_te ?
  75                         dssdev->driver->get_te(dssdev) : 0);
  76 }
  77
  78 static ssize_t display_tear_store(struct device *dev,
  79                 struct device_attribute *attr, const char *buf, size_t size)
  80 {
  81         struct omap_dss_device *dssdev = to_dss_device(dev);
  82         int te, r;
  83
  84         if (!dssdev->driver->enable_te || !dssdev->driver->get_te)
  85                 return -ENOENT;
  86
  87         r = kstrtoint(buf, 0, &te);
  88         if (r)
  89                 return r;
  90
  91         te = !!te;
  92
  93         r = dssdev->driver->enable_te(dssdev, te);
  94         if (r)
  95                 return r;
  96
  97         return size;
  98 }
  99
 100 static ssize_t display_timings_show(struct device *dev,
 101                 struct device_attribute *attr, char *buf)
 102 {
 103         struct omap_dss_device *dssdev = to_dss_device(dev);
 104         struct omap_video_timings t;
 105
 106         if (!dssdev->driver->get_timings)
 107                 return -ENOENT;
 108
 109         dssdev->driver->get_timings(dssdev, &t);
 110
 111         return snprintf(buf, PAGE_SIZE, "%u,%u/%u/%u/%u,%u/%u/%u/%u\n",
 112                         t.pixel_clock,
 113                         t.x_res, t.hfp, t.hbp, t.hsw,
 114                         t.y_res, t.vfp, t.vbp, t.vsw);
 115 }
 116
 117 static ssize_t display_timings_store(struct device *dev,
 118                 struct device_attribute *attr, const char *buf, size_t size)
 119 {
 120         struct omap_dss_device *dssdev = to_dss_device(dev);
 121         struct omap_video_timings t;
 122         int r, found;
 123
 124         if (!dssdev->driver->set_timings || !dssdev->driver->check_timings)
 125                 return -ENOENT;
 126
 127         found = 0;
 128 #ifdef CONFIG_OMAP2_DSS_VENC
 129         if (strncmp("pal", buf, 3) == 0) {
 130                 t = omap_dss_pal_timings;
 131                 found = 1;
 132         } else if (strncmp("ntsc", buf, 4) == 0) {
 133                 t = omap_dss_ntsc_timings;
 134                 found = 1;
 135         }
 136 #endif
 137         if (!found && sscanf(buf, "%u,%hu/%hu/%hu/%hu,%hu/%hu/%hu/%hu",
 138                                 &t.pixel_clock,
 139                                 &t.x_res, &t.hfp, &t.hbp, &t.hsw,
 140                                 &t.y_res, &t.vfp, &t.vbp, &t.vsw) != 9)
 141                 return -EINVAL;
 142
 143         r = dssdev->driver->check_timings(dssdev, &t);
 144         if (r)
 145                 return r;
 146
 147         dssdev->driver->set_timings(dssdev, &t);
 148
 149         return size;
 150 }
 151
 152 static ssize_t display_rotate_show(struct device *dev,
 153                 struct device_attribute *attr, char *buf)
 154 {
 155         struct omap_dss_device *dssdev = to_dss_device(dev);
 156         int rotate;
 157         if (!dssdev->driver->get_rotate)
 158                 return -ENOENT;
 159         rotate = dssdev->driver->get_rotate(dssdev);
 160         return snprintf(buf, PAGE_SIZE, "%u\n", rotate);
 161 }
 162
 163 static ssize_t display_rotate_store(struct device *dev,
 164                 struct device_attribute *attr, const char *buf, size_t size)
 165 {
 166         struct omap_dss_device *dssdev = to_dss_device(dev);
 167         int rot, r;
 168
 169         if (!dssdev->driver->set_rotate || !dssdev->driver->get_rotate)
 170                 return -ENOENT;
 171
 172         r = kstrtoint(buf, 0, &rot);
 173         if (r)
 174                 return r;
 175
 176         r = dssdev->driver->set_rotate(dssdev, rot);
 177         if (r)
 178                 return r;
 179
 180         return size;
 181 }
 182
 183 static ssize_t display_mirror_show(struct device *dev,
 184                 struct device_attribute *attr, char *buf)
 185 {
 186         struct omap_dss_device *dssdev = to_dss_device(dev);
 187         int mirror;
 188         if (!dssdev->driver->get_mirror)
 189                 return -ENOENT;
 190         mirror = dssdev->driver->get_mirror(dssdev);
 191         return snprintf(buf, PAGE_SIZE, "%u\n", mirror);
 192 }
 193
 194 static ssize_t display_mirror_store(struct device *dev,
 195                 struct device_attribute *attr, const char *buf, size_t size)
 196 {
 197         struct omap_dss_device *dssdev = to_dss_device(dev);
 198         int mirror, r;
 199
 200         if (!dssdev->driver->set_mirror || !dssdev->driver->get_mirror)
 201                 return -ENOENT;
 202
 203         r = kstrtoint(buf, 0, &mirror);
 204         if (r)
 205                 return r;
 206
 207         mirror = !!mirror;
 208
 209         r = dssdev->driver->set_mirror(dssdev, mirror);
 210         if (r)
 211                 return r;
 212
 213         return size;
 214 }
 215
 216 static ssize_t display_wss_show(struct device *dev,
 217                 struct device_attribute *attr, char *buf)
 218 {
 219         struct omap_dss_device *dssdev = to_dss_device(dev);
 220         unsigned int wss;
 221
 222         if (!dssdev->driver->get_wss)
 223                 return -ENOENT;
 224
 225         wss = dssdev->driver->get_wss(dssdev);
 226
 227         return snprintf(buf, PAGE_SIZE, "0x%05x\n", wss);
 228 }
 229
 230 static ssize_t display_wss_store(struct device *dev,
 231                 struct device_attribute *attr, const char *buf, size_t size)
 232 {
 233         struct omap_dss_device *dssdev = to_dss_device(dev);
 234         u32 wss;
 235         int r;
 236
 237         if (!dssdev->driver->get_wss || !dssdev->driver->set_wss)
 238                 return -ENOENT;
 239
 240         r = kstrtou32(buf, 0, &wss);
 241         if (r)
 242                 return r;
 243
 244         if (wss > 0xfffff)
 245                 return -EINVAL;
 246
 247         r = dssdev->driver->set_wss(dssdev, wss);
 248         if (r)
 249                 return r;
 250
 251         return size;
 252 }
 253
 254 static DEVICE_ATTR(enabled, S_IRUGO|S_IWUSR,
 255                 display_enabled_show, display_enabled_store);
 256 static DEVICE_ATTR(tear_elim, S_IRUGO|S_IWUSR,
 257                 display_tear_show, display_tear_store);
 258 static DEVICE_ATTR(timings, S_IRUGO|S_IWUSR,
 259                 display_timings_show, display_timings_store);
 260 static DEVICE_ATTR(rotate, S_IRUGO|S_IWUSR,
 261                 display_rotate_show, display_rotate_store);
 262 static DEVICE_ATTR(mirror, S_IRUGO|S_IWUSR,
 263                 display_mirror_show, display_mirror_store);
 264 static DEVICE_ATTR(wss, S_IRUGO|S_IWUSR,
 265                 display_wss_show, display_wss_store);
 266
 267 static struct device_attribute *display_sysfs_attrs[] = {
 268         &dev_attr_enabled,
 269         &dev_attr_tear_elim,
 270         &dev_attr_timings,
 271         &dev_attr_rotate,
 272         &dev_attr_mirror,
 273         &dev_attr_wss,
 274         NULL
 275 };
 276
 277 void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
 278                         u16 *xres, u16 *yres)
 279 {
 280         *xres = dssdev->panel.timings.x_res;
 281         *yres = dssdev->panel.timings.y_res;
 282 }
 283 EXPORT_SYMBOL(omapdss_default_get_resolution);
 284
 285 void default_get_overlay_fifo_thresholds(enum omap_plane plane,
 286                 u32 fifo_size, u32 burst_size,
 287                 u32 *fifo_low, u32 *fifo_high)
 288 {
 289         unsigned buf_unit = dss_feat_get_buffer_size_unit();
 290
 291         *fifo_high = fifo_size - buf_unit;
 292         *fifo_low = fifo_size - burst_size;
 293 }
 294
 295 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
 296 {
 297         switch (dssdev->type) {
 298         case OMAP_DISPLAY_TYPE_DPI:
 299                 if (dssdev->phy.dpi.data_lines == 24)
 300                         return 24;
 301                 else
 302                         return 16;
 303
 304         case OMAP_DISPLAY_TYPE_DBI:
 305         case OMAP_DISPLAY_TYPE_DSI:
 306                 if (dssdev->ctrl.pixel_size == 24)
 307                         return 24;
 308                 else
 309                         return 16;
 310         case OMAP_DISPLAY_TYPE_VENC:
 311         case OMAP_DISPLAY_TYPE_SDI:
 312         case OMAP_DISPLAY_TYPE_HDMI:
 313                 return 24;
 314         default:
 315                 BUG();
 316         }
 317 }
 318 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
 319
 320 /* Checks if replication logic should be used. Only use for active matrix,
 321  * when overlay is in RGB12U or RGB16 mode, and LCD interface is
 322  * 18bpp or 24bpp */
 323 bool dss_use_replication(struct omap_dss_device *dssdev,
 324                 enum omap_color_mode mode)
 325 {
 326         int bpp;
 327
 328         if (mode != OMAP_DSS_COLOR_RGB12U && mode != OMAP_DSS_COLOR_RGB16)
 329                 return false;
 330
 331         if (dssdev->type == OMAP_DISPLAY_TYPE_DPI &&
 332                         (dssdev->panel.config & OMAP_DSS_LCD_TFT) == 0)
 333                 return false;
 334
 335         switch (dssdev->type) {
 336         case OMAP_DISPLAY_TYPE_DPI:
 337                 bpp = dssdev->phy.dpi.data_lines;
 338                 break;
 339         case OMAP_DISPLAY_TYPE_HDMI:
 340         case OMAP_DISPLAY_TYPE_VENC:
 341         case OMAP_DISPLAY_TYPE_SDI:
 342                 bpp = 24;
 343                 break;
 344         case OMAP_DISPLAY_TYPE_DBI:
 345         case OMAP_DISPLAY_TYPE_DSI:
 346                 bpp = dssdev->ctrl.pixel_size;
 347                 break;
 348         default:
 349                 BUG();
 350         }
 351
 352         return bpp > 16;
 353 }
 354
 355 void dss_init_device(struct platform_device *pdev,
 356                 struct omap_dss_device *dssdev)
 357 {
 358         struct device_attribute *attr;
 359         int i;
 360         int r;
 361
 362         switch (dssdev->type) {
 363 #ifdef CONFIG_OMAP2_DSS_DPI
 364         case OMAP_DISPLAY_TYPE_DPI:
 365                 r = dpi_init_display(dssdev);
 366                 break;
 367 #endif
 368 #ifdef CONFIG_OMAP2_DSS_RFBI
 369         case OMAP_DISPLAY_TYPE_DBI:
 370                 r = rfbi_init_display(dssdev);
 371                 break;
 372 #endif
 373 #ifdef CONFIG_OMAP2_DSS_VENC
 374         case OMAP_DISPLAY_TYPE_VENC:
 375                 r = venc_init_display(dssdev);
 376                 break;
 377 #endif
 378 #ifdef CONFIG_OMAP2_DSS_SDI
 379         case OMAP_DISPLAY_TYPE_SDI:
 380                 r = sdi_init_display(dssdev);
 381                 break;
 382 #endif
 383 #ifdef CONFIG_OMAP2_DSS_DSI
 384         case OMAP_DISPLAY_TYPE_DSI:
 385                 r = dsi_init_display(dssdev);
 386                 break;
 387 #endif
 388         case OMAP_DISPLAY_TYPE_HDMI:
 389                 r = hdmi_init_display(dssdev);
 390                 break;
 391         default:
 392                 DSSERR("Support for display '%s' not compiled in.\n",
 393                                 dssdev->name);
 394                 return;
 395         }
 396
 397         if (r) {
 398                 DSSERR("failed to init display %s\n", dssdev->name);
 399                 return;
 400         }
 401
 402         /* create device sysfs files */
 403         i = 0;
 404         while ((attr = display_sysfs_attrs[i++]) != NULL) {
 405                 r = device_create_file(&dssdev->dev, attr);
 406                 if (r)
 407                         DSSERR("failed to create sysfs file\n");
 408         }
 409
 410         /* create display? sysfs links */
 411         r = sysfs_create_link(&pdev->dev.kobj, &dssdev->dev.kobj,
 412                         dev_name(&dssdev->dev));
 413         if (r)
 414                 DSSERR("failed to create sysfs display link\n");
 415 }
 416
 417 void dss_uninit_device(struct platform_device *pdev,
 418                 struct omap_dss_device *dssdev)
 419 {
 420         struct device_attribute *attr;
 421         int i = 0;
 422
 423         sysfs_remove_link(&pdev->dev.kobj, dev_name(&dssdev->dev));
 424
 425         while ((attr = display_sysfs_attrs[i++]) != NULL)
 426                 device_remove_file(&dssdev->dev, attr);
 427
 428         if (dssdev->manager)
 429                 dssdev->manager->unset_device(dssdev->manager);
 430 }
 431
 432 static int dss_suspend_device(struct device *dev, void *data)
 433 {
 434         int r;
 435         struct omap_dss_device *dssdev = to_dss_device(dev);
 436
 437         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
 438                 dssdev->activate_after_resume = false;
 439                 return 0;
 440         }
 441
 442         if (!dssdev->driver->suspend) {
 443                 DSSERR("display '%s' doesn't implement suspend\n",
 444                                 dssdev->name);
 445                 return -ENOSYS;
 446         }
 447
 448         r = dssdev->driver->suspend(dssdev);
 449         if (r)
 450                 return r;
 451
 452         dssdev->activate_after_resume = true;
 453
 454         return 0;
 455 }
 456
 457 int dss_suspend_all_devices(void)
 458 {
 459         int r;
 460         struct bus_type *bus = dss_get_bus();
 461
 462         r = bus_for_each_dev(bus, NULL, NULL, dss_suspend_device);
 463         if (r) {
 464                 /* resume all displays that were suspended */
 465                 dss_resume_all_devices();
 466                 return r;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static int dss_resume_device(struct device *dev, void *data)
 473 {
 474         int r;
 475         struct omap_dss_device *dssdev = to_dss_device(dev);
 476
 477         if (dssdev->activate_after_resume && dssdev->driver->resume) {
 478                 r = dssdev->driver->resume(dssdev);
 479                 if (r)
 480                         return r;
 481         }
 482
 483         dssdev->activate_after_resume = false;
 484
 485         return 0;
 486 }
 487
 488 int dss_resume_all_devices(void)
 489 {
 490         struct bus_type *bus = dss_get_bus();
 491
 492         return bus_for_each_dev(bus, NULL, NULL, dss_resume_device);
 493 }
 494
 495 static int dss_disable_device(struct device *dev, void *data)
 496 {
 497         struct omap_dss_device *dssdev = to_dss_device(dev);
 498
 499         if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)
 500                 dssdev->driver->disable(dssdev);
 501
 502         return 0;
 503 }
 504
 505 void dss_disable_all_devices(void)
 506 {
 507         struct bus_type *bus = dss_get_bus();
 508         bus_for_each_dev(bus, NULL, NULL, dss_disable_device);
 509 }
 510
 511
 512 void omap_dss_get_device(struct omap_dss_device *dssdev)
 513 {
 514         get_device(&dssdev->dev);
 515 }
 516 EXPORT_SYMBOL(omap_dss_get_device);
 517
 518 void omap_dss_put_device(struct omap_dss_device *dssdev)
 519 {
 520         put_device(&dssdev->dev);
 521 }
 522 EXPORT_SYMBOL(omap_dss_put_device);
 523
 524 /* ref count of the found device is incremented. ref count
 525  * of from-device is decremented. */
 526 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 527 {
 528         struct device *dev;
 529         struct device *dev_start = NULL;
 530         struct omap_dss_device *dssdev = NULL;
 531
 532         int match(struct device *dev, void *data)
 533         {
 534                 return 1;
 535         }
 536
 537         if (from)
 538                 dev_start = &from->dev;
 539         dev = bus_find_device(dss_get_bus(), dev_start, NULL, match);
 540         if (dev)
 541                 dssdev = to_dss_device(dev);
 542         if (from)
 543                 put_device(&from->dev);
 544
 545         return dssdev;
 546 }
 547 EXPORT_SYMBOL(omap_dss_get_next_device);
 548
 549 struct omap_dss_device *omap_dss_find_device(void *data,
 550                 int (*match)(struct omap_dss_device *dssdev, void *data))
 551 {
 552         struct omap_dss_device *dssdev = NULL;
 553
 554         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 555                 if (match(dssdev, data))
 556                         return dssdev;
 557         }
 558
 559         return NULL;
 560 }
 561 EXPORT_SYMBOL(omap_dss_find_device);
 562
 563 int omap_dss_start_device(struct omap_dss_device *dssdev)
 564 {
 565         if (!dssdev->driver) {
 566                 DSSDBG("no driver\n");
 567                 return -ENODEV;
 568         }
 569
 570         if (!try_module_get(dssdev->dev.driver->owner)) {
 571                 return -ENODEV;
 572         }
 573
 574         return 0;
 575 }
 576 EXPORT_SYMBOL(omap_dss_start_device);
 577
 578 void omap_dss_stop_device(struct omap_dss_device *dssdev)
 579 {
 580         module_put(dssdev->dev.driver->owner);
 581 }
 582 EXPORT_SYMBOL(omap_dss_stop_device);
 583