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;
  49         bool enabled;
  50
  51         r = strtobool(buf, &enabled);
  52         if (r)
  53                 return r;
  54
  55         if (enabled != (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)) {
  56                 if (enabled) {
  57                         r = dssdev->driver->enable(dssdev);
  58                         if (r)
  59                                 return r;
  60                 } else {
  61                         dssdev->driver->disable(dssdev);
  62                 }
  63         }
  64
  65         return size;
  66 }
  67
  68 static ssize_t display_tear_show(struct device *dev,
  69                 struct device_attribute *attr, char *buf)
  70 {
  71         struct omap_dss_device *dssdev = to_dss_device(dev);
  72         return snprintf(buf, PAGE_SIZE, "%d\n",
  73                         dssdev->driver->get_te ?
  74                         dssdev->driver->get_te(dssdev) : 0);
  75 }
  76
  77 static ssize_t display_tear_store(struct device *dev,
  78                 struct device_attribute *attr, const char *buf, size_t size)
  79 {
  80         struct omap_dss_device *dssdev = to_dss_device(dev);
  81         int r;
  82         bool te;
  83
  84         if (!dssdev->driver->enable_te || !dssdev->driver->get_te)
  85                 return -ENOENT;
  86
  87         r = strtobool(buf, &te);
  88         if (r)
  89                 return r;
  90
  91         r = dssdev->driver->enable_te(dssdev, te);
  92         if (r)
  93                 return r;
  94
  95         return size;
  96 }
  97
  98 static ssize_t display_timings_show(struct device *dev,
  99                 struct device_attribute *attr, char *buf)
 100 {
 101         struct omap_dss_device *dssdev = to_dss_device(dev);
 102         struct omap_video_timings t;
 103
 104         if (!dssdev->driver->get_timings)
 105                 return -ENOENT;
 106
 107         dssdev->driver->get_timings(dssdev, &t);
 108
 109         return snprintf(buf, PAGE_SIZE, "%u,%u/%u/%u/%u,%u/%u/%u/%u\n",
 110                         t.pixel_clock,
 111                         t.x_res, t.hfp, t.hbp, t.hsw,
 112                         t.y_res, t.vfp, t.vbp, t.vsw);
 113 }
 114
 115 static ssize_t display_timings_store(struct device *dev,
 116                 struct device_attribute *attr, const char *buf, size_t size)
 117 {
 118         struct omap_dss_device *dssdev = to_dss_device(dev);
 119         struct omap_video_timings t;
 120         int r, found;
 121
 122         if (!dssdev->driver->set_timings || !dssdev->driver->check_timings)
 123                 return -ENOENT;
 124
 125         found = 0;
 126 #ifdef CONFIG_OMAP2_DSS_VENC
 127         if (strncmp("pal", buf, 3) == 0) {
 128                 t = omap_dss_pal_timings;
 129                 found = 1;
 130         } else if (strncmp("ntsc", buf, 4) == 0) {
 131                 t = omap_dss_ntsc_timings;
 132                 found = 1;
 133         }
 134 #endif
 135         if (!found && sscanf(buf, "%u,%hu/%hu/%hu/%hu,%hu/%hu/%hu/%hu",
 136                                 &t.pixel_clock,
 137                                 &t.x_res, &t.hfp, &t.hbp, &t.hsw,
 138                                 &t.y_res, &t.vfp, &t.vbp, &t.vsw) != 9)
 139                 return -EINVAL;
 140
 141         r = dssdev->driver->check_timings(dssdev, &t);
 142         if (r)
 143                 return r;
 144
 145         dssdev->driver->set_timings(dssdev, &t);
 146
 147         return size;
 148 }
 149
 150 static ssize_t display_rotate_show(struct device *dev,
 151                 struct device_attribute *attr, char *buf)
 152 {
 153         struct omap_dss_device *dssdev = to_dss_device(dev);
 154         int rotate;
 155         if (!dssdev->driver->get_rotate)
 156                 return -ENOENT;
 157         rotate = dssdev->driver->get_rotate(dssdev);
 158         return snprintf(buf, PAGE_SIZE, "%u\n", rotate);
 159 }
 160
 161 static ssize_t display_rotate_store(struct device *dev,
 162                 struct device_attribute *attr, const char *buf, size_t size)
 163 {
 164         struct omap_dss_device *dssdev = to_dss_device(dev);
 165         int rot, r;
 166
 167         if (!dssdev->driver->set_rotate || !dssdev->driver->get_rotate)
 168                 return -ENOENT;
 169
 170         r = kstrtoint(buf, 0, &rot);
 171         if (r)
 172                 return r;
 173
 174         r = dssdev->driver->set_rotate(dssdev, rot);
 175         if (r)
 176                 return r;
 177
 178         return size;
 179 }
 180
 181 static ssize_t display_mirror_show(struct device *dev,
 182                 struct device_attribute *attr, char *buf)
 183 {
 184         struct omap_dss_device *dssdev = to_dss_device(dev);
 185         int mirror;
 186         if (!dssdev->driver->get_mirror)
 187                 return -ENOENT;
 188         mirror = dssdev->driver->get_mirror(dssdev);
 189         return snprintf(buf, PAGE_SIZE, "%u\n", mirror);
 190 }
 191
 192 static ssize_t display_mirror_store(struct device *dev,
 193                 struct device_attribute *attr, const char *buf, size_t size)
 194 {
 195         struct omap_dss_device *dssdev = to_dss_device(dev);
 196         int r;
 197         bool mirror;
 198
 199         if (!dssdev->driver->set_mirror || !dssdev->driver->get_mirror)
 200                 return -ENOENT;
 201
 202         r = strtobool(buf, &mirror);
 203         if (r)
 204                 return r;
 205
 206         r = dssdev->driver->set_mirror(dssdev, mirror);
 207         if (r)
 208                 return r;
 209
 210         return size;
 211 }
 212
 213 static ssize_t display_wss_show(struct device *dev,
 214                 struct device_attribute *attr, char *buf)
 215 {
 216         struct omap_dss_device *dssdev = to_dss_device(dev);
 217         unsigned int wss;
 218
 219         if (!dssdev->driver->get_wss)
 220                 return -ENOENT;
 221
 222         wss = dssdev->driver->get_wss(dssdev);
 223
 224         return snprintf(buf, PAGE_SIZE, "0x%05x\n", wss);
 225 }
 226
 227 static ssize_t display_wss_store(struct device *dev,
 228                 struct device_attribute *attr, const char *buf, size_t size)
 229 {
 230         struct omap_dss_device *dssdev = to_dss_device(dev);
 231         u32 wss;
 232         int r;
 233
 234         if (!dssdev->driver->get_wss || !dssdev->driver->set_wss)
 235                 return -ENOENT;
 236
 237         r = kstrtou32(buf, 0, &wss);
 238         if (r)
 239                 return r;
 240
 241         if (wss > 0xfffff)
 242                 return -EINVAL;
 243
 244         r = dssdev->driver->set_wss(dssdev, wss);
 245         if (r)
 246                 return r;
 247
 248         return size;
 249 }
 250
 251 static DEVICE_ATTR(enabled, S_IRUGO|S_IWUSR,
 252                 display_enabled_show, display_enabled_store);
 253 static DEVICE_ATTR(tear_elim, S_IRUGO|S_IWUSR,
 254                 display_tear_show, display_tear_store);
 255 static DEVICE_ATTR(timings, S_IRUGO|S_IWUSR,
 256                 display_timings_show, display_timings_store);
 257 static DEVICE_ATTR(rotate, S_IRUGO|S_IWUSR,
 258                 display_rotate_show, display_rotate_store);
 259 static DEVICE_ATTR(mirror, S_IRUGO|S_IWUSR,
 260                 display_mirror_show, display_mirror_store);
 261 static DEVICE_ATTR(wss, S_IRUGO|S_IWUSR,
 262                 display_wss_show, display_wss_store);
 263
 264 static struct device_attribute *display_sysfs_attrs[] = {
 265         &dev_attr_enabled,
 266         &dev_attr_tear_elim,
 267         &dev_attr_timings,
 268         &dev_attr_rotate,
 269         &dev_attr_mirror,
 270         &dev_attr_wss,
 271         NULL
 272 };
 273
 274 void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
 275                         u16 *xres, u16 *yres)
 276 {
 277         *xres = dssdev->panel.timings.x_res;
 278         *yres = dssdev->panel.timings.y_res;
 279 }
 280 EXPORT_SYMBOL(omapdss_default_get_resolution);
 281
 282 void default_get_overlay_fifo_thresholds(enum omap_plane plane,
 283                 u32 fifo_size, u32 burst_size,
 284                 u32 *fifo_low, u32 *fifo_high)
 285 {
 286         unsigned buf_unit = dss_feat_get_buffer_size_unit();
 287
 288         *fifo_high = fifo_size - buf_unit;
 289         *fifo_low = fifo_size - burst_size;
 290 }
 291
 292 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
 293 {
 294         switch (dssdev->type) {
 295         case OMAP_DISPLAY_TYPE_DPI:
 296                 if (dssdev->phy.dpi.data_lines == 24)
 297                         return 24;
 298                 else
 299                         return 16;
 300
 301         case OMAP_DISPLAY_TYPE_DBI:
 302                 if (dssdev->ctrl.pixel_size == 24)
 303                         return 24;
 304                 else
 305                         return 16;
 306         case OMAP_DISPLAY_TYPE_DSI:
 307                 if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
 308                         return 24;
 309                 else
 310                         return 16;
 311         case OMAP_DISPLAY_TYPE_VENC:
 312         case OMAP_DISPLAY_TYPE_SDI:
 313         case OMAP_DISPLAY_TYPE_HDMI:
 314                 return 24;
 315         default:
 316                 BUG();
 317         }
 318 }
 319 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
 320
 321 /* Checks if replication logic should be used. Only use for active matrix,
 322  * when overlay is in RGB12U or RGB16 mode, and LCD interface is
 323  * 18bpp or 24bpp */
 324 bool dss_use_replication(struct omap_dss_device *dssdev,
 325                 enum omap_color_mode mode)
 326 {
 327         int bpp;
 328
 329         if (mode != OMAP_DSS_COLOR_RGB12U && mode != OMAP_DSS_COLOR_RGB16)
 330                 return false;
 331
 332         if (dssdev->type == OMAP_DISPLAY_TYPE_DPI &&
 333                         (dssdev->panel.config & OMAP_DSS_LCD_TFT) == 0)
 334                 return false;
 335
 336         switch (dssdev->type) {
 337         case OMAP_DISPLAY_TYPE_DPI:
 338                 bpp = dssdev->phy.dpi.data_lines;
 339                 break;
 340         case OMAP_DISPLAY_TYPE_HDMI:
 341         case OMAP_DISPLAY_TYPE_VENC:
 342         case OMAP_DISPLAY_TYPE_SDI:
 343                 bpp = 24;
 344                 break;
 345         case OMAP_DISPLAY_TYPE_DBI:
 346                 bpp = dssdev->ctrl.pixel_size;
 347                 break;
 348         case OMAP_DISPLAY_TYPE_DSI:
 349                 bpp = dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt);
 350                 break;
 351         default:
 352                 BUG();
 353         }
 354
 355         return bpp > 16;
 356 }
 357
 358 void dss_init_device(struct platform_device *pdev,
 359                 struct omap_dss_device *dssdev)
 360 {
 361         struct device_attribute *attr;
 362         int i;
 363         int r;
 364
 365         switch (dssdev->type) {
 366 #ifdef CONFIG_OMAP2_DSS_DPI
 367         case OMAP_DISPLAY_TYPE_DPI:
 368                 r = dpi_init_display(dssdev);
 369                 break;
 370 #endif
 371 #ifdef CONFIG_OMAP2_DSS_RFBI
 372         case OMAP_DISPLAY_TYPE_DBI:
 373                 r = rfbi_init_display(dssdev);
 374                 break;
 375 #endif
 376 #ifdef CONFIG_OMAP2_DSS_VENC
 377         case OMAP_DISPLAY_TYPE_VENC:
 378                 r = venc_init_display(dssdev);
 379                 break;
 380 #endif
 381 #ifdef CONFIG_OMAP2_DSS_SDI
 382         case OMAP_DISPLAY_TYPE_SDI:
 383                 r = sdi_init_display(dssdev);
 384                 break;
 385 #endif
 386 #ifdef CONFIG_OMAP2_DSS_DSI
 387         case OMAP_DISPLAY_TYPE_DSI:
 388                 r = dsi_init_display(dssdev);
 389                 break;
 390 #endif
 391         case OMAP_DISPLAY_TYPE_HDMI:
 392                 r = hdmi_init_display(dssdev);
 393                 break;
 394         default:
 395                 DSSERR("Support for display '%s' not compiled in.\n",
 396                                 dssdev->name);
 397                 return;
 398         }
 399
 400         if (r) {
 401                 DSSERR("failed to init display %s\n", dssdev->name);
 402                 return;
 403         }
 404
 405         /* create device sysfs files */
 406         i = 0;
 407         while ((attr = display_sysfs_attrs[i++]) != NULL) {
 408                 r = device_create_file(&dssdev->dev, attr);
 409                 if (r)
 410                         DSSERR("failed to create sysfs file\n");
 411         }
 412
 413         /* create display? sysfs links */
 414         r = sysfs_create_link(&pdev->dev.kobj, &dssdev->dev.kobj,
 415                         dev_name(&dssdev->dev));
 416         if (r)
 417                 DSSERR("failed to create sysfs display link\n");
 418 }
 419
 420 void dss_uninit_device(struct platform_device *pdev,
 421                 struct omap_dss_device *dssdev)
 422 {
 423         struct device_attribute *attr;
 424         int i = 0;
 425
 426         sysfs_remove_link(&pdev->dev.kobj, dev_name(&dssdev->dev));
 427
 428         while ((attr = display_sysfs_attrs[i++]) != NULL)
 429                 device_remove_file(&dssdev->dev, attr);
 430
 431         if (dssdev->manager)
 432                 dssdev->manager->unset_device(dssdev->manager);
 433 }
 434
 435 static int dss_suspend_device(struct device *dev, void *data)
 436 {
 437         int r;
 438         struct omap_dss_device *dssdev = to_dss_device(dev);
 439
 440         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
 441                 dssdev->activate_after_resume = false;
 442                 return 0;
 443         }
 444
 445         if (!dssdev->driver->suspend) {
 446                 DSSERR("display '%s' doesn't implement suspend\n",
 447                                 dssdev->name);
 448                 return -ENOSYS;
 449         }
 450
 451         r = dssdev->driver->suspend(dssdev);
 452         if (r)
 453                 return r;
 454
 455         dssdev->activate_after_resume = true;
 456
 457         return 0;
 458 }
 459
 460 int dss_suspend_all_devices(void)
 461 {
 462         int r;
 463         struct bus_type *bus = dss_get_bus();
 464
 465         r = bus_for_each_dev(bus, NULL, NULL, dss_suspend_device);
 466         if (r) {
 467                 /* resume all displays that were suspended */
 468                 dss_resume_all_devices();
 469                 return r;
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int dss_resume_device(struct device *dev, void *data)
 476 {
 477         int r;
 478         struct omap_dss_device *dssdev = to_dss_device(dev);
 479
 480         if (dssdev->activate_after_resume && dssdev->driver->resume) {
 481                 r = dssdev->driver->resume(dssdev);
 482                 if (r)
 483                         return r;
 484         }
 485
 486         dssdev->activate_after_resume = false;
 487
 488         return 0;
 489 }
 490
 491 int dss_resume_all_devices(void)
 492 {
 493         struct bus_type *bus = dss_get_bus();
 494
 495         return bus_for_each_dev(bus, NULL, NULL, dss_resume_device);
 496 }
 497
 498 static int dss_disable_device(struct device *dev, void *data)
 499 {
 500         struct omap_dss_device *dssdev = to_dss_device(dev);
 501
 502         if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)
 503                 dssdev->driver->disable(dssdev);
 504
 505         return 0;
 506 }
 507
 508 void dss_disable_all_devices(void)
 509 {
 510         struct bus_type *bus = dss_get_bus();
 511         bus_for_each_dev(bus, NULL, NULL, dss_disable_device);
 512 }
 513
 514
 515 void omap_dss_get_device(struct omap_dss_device *dssdev)
 516 {
 517         get_device(&dssdev->dev);
 518 }
 519 EXPORT_SYMBOL(omap_dss_get_device);
 520
 521 void omap_dss_put_device(struct omap_dss_device *dssdev)
 522 {
 523         put_device(&dssdev->dev);
 524 }
 525 EXPORT_SYMBOL(omap_dss_put_device);
 526
 527 /* ref count of the found device is incremented. ref count
 528  * of from-device is decremented. */
 529 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 530 {
 531         struct device *dev;
 532         struct device *dev_start = NULL;
 533         struct omap_dss_device *dssdev = NULL;
 534
 535         int match(struct device *dev, void *data)
 536         {
 537                 return 1;
 538         }
 539
 540         if (from)
 541                 dev_start = &from->dev;
 542         dev = bus_find_device(dss_get_bus(), dev_start, NULL, match);
 543         if (dev)
 544                 dssdev = to_dss_device(dev);
 545         if (from)
 546                 put_device(&from->dev);
 547
 548         return dssdev;
 549 }
 550 EXPORT_SYMBOL(omap_dss_get_next_device);
 551
 552 struct omap_dss_device *omap_dss_find_device(void *data,
 553                 int (*match)(struct omap_dss_device *dssdev, void *data))
 554 {
 555         struct omap_dss_device *dssdev = NULL;
 556
 557         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 558                 if (match(dssdev, data))
 559                         return dssdev;
 560         }
 561
 562         return NULL;
 563 }
 564 EXPORT_SYMBOL(omap_dss_find_device);
 565
 566 int omap_dss_start_device(struct omap_dss_device *dssdev)
 567 {
 568         if (!dssdev->driver) {
 569                 DSSDBG("no driver\n");
 570                 return -ENODEV;
 571         }
 572
 573         if (!try_module_get(dssdev->dev.driver->owner)) {
 574                 return -ENODEV;
 575         }
 576
 577         return 0;
 578 }
 579 EXPORT_SYMBOL(omap_dss_start_device);
 580
 581 void omap_dss_stop_device(struct omap_dss_device *dssdev)
 582 {
 583         module_put(dssdev->dev.driver->owner);
 584 }
 585 EXPORT_SYMBOL(omap_dss_stop_device);
 586