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 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
 283 {
 284         switch (dssdev->type) {
 285         case OMAP_DISPLAY_TYPE_DPI:
 286                 if (dssdev->phy.dpi.data_lines == 24)
 287                         return 24;
 288                 else
 289                         return 16;
 290
 291         case OMAP_DISPLAY_TYPE_DBI:
 292                 if (dssdev->ctrl.pixel_size == 24)
 293                         return 24;
 294                 else
 295                         return 16;
 296         case OMAP_DISPLAY_TYPE_DSI:
 297                 if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
 298                         return 24;
 299                 else
 300                         return 16;
 301         case OMAP_DISPLAY_TYPE_VENC:
 302         case OMAP_DISPLAY_TYPE_SDI:
 303         case OMAP_DISPLAY_TYPE_HDMI:
 304                 return 24;
 305         default:
 306                 BUG();
 307         }
 308 }
 309 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
 310
 311 /* Checks if replication logic should be used. Only use for active matrix,
 312  * when overlay is in RGB12U or RGB16 mode, and LCD interface is
 313  * 18bpp or 24bpp */
 314 bool dss_use_replication(struct omap_dss_device *dssdev,
 315                 enum omap_color_mode mode)
 316 {
 317         int bpp;
 318
 319         if (mode != OMAP_DSS_COLOR_RGB12U && mode != OMAP_DSS_COLOR_RGB16)
 320                 return false;
 321
 322         if (dssdev->type == OMAP_DISPLAY_TYPE_DPI &&
 323                         (dssdev->panel.config & OMAP_DSS_LCD_TFT) == 0)
 324                 return false;
 325
 326         switch (dssdev->type) {
 327         case OMAP_DISPLAY_TYPE_DPI:
 328                 bpp = dssdev->phy.dpi.data_lines;
 329                 break;
 330         case OMAP_DISPLAY_TYPE_HDMI:
 331         case OMAP_DISPLAY_TYPE_VENC:
 332         case OMAP_DISPLAY_TYPE_SDI:
 333                 bpp = 24;
 334                 break;
 335         case OMAP_DISPLAY_TYPE_DBI:
 336                 bpp = dssdev->ctrl.pixel_size;
 337                 break;
 338         case OMAP_DISPLAY_TYPE_DSI:
 339                 bpp = dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt);
 340                 break;
 341         default:
 342                 BUG();
 343         }
 344
 345         return bpp > 16;
 346 }
 347
 348 void dss_init_device(struct platform_device *pdev,
 349                 struct omap_dss_device *dssdev)
 350 {
 351         struct device_attribute *attr;
 352         int i;
 353         int r;
 354
 355         switch (dssdev->type) {
 356 #ifdef CONFIG_OMAP2_DSS_DPI
 357         case OMAP_DISPLAY_TYPE_DPI:
 358                 r = dpi_init_display(dssdev);
 359                 break;
 360 #endif
 361 #ifdef CONFIG_OMAP2_DSS_RFBI
 362         case OMAP_DISPLAY_TYPE_DBI:
 363                 r = rfbi_init_display(dssdev);
 364                 break;
 365 #endif
 366 #ifdef CONFIG_OMAP2_DSS_VENC
 367         case OMAP_DISPLAY_TYPE_VENC:
 368                 r = venc_init_display(dssdev);
 369                 break;
 370 #endif
 371 #ifdef CONFIG_OMAP2_DSS_SDI
 372         case OMAP_DISPLAY_TYPE_SDI:
 373                 r = sdi_init_display(dssdev);
 374                 break;
 375 #endif
 376 #ifdef CONFIG_OMAP2_DSS_DSI
 377         case OMAP_DISPLAY_TYPE_DSI:
 378                 r = dsi_init_display(dssdev);
 379                 break;
 380 #endif
 381         case OMAP_DISPLAY_TYPE_HDMI:
 382                 r = hdmi_init_display(dssdev);
 383                 break;
 384         default:
 385                 DSSERR("Support for display '%s' not compiled in.\n",
 386                                 dssdev->name);
 387                 return;
 388         }
 389
 390         if (r) {
 391                 DSSERR("failed to init display %s\n", dssdev->name);
 392                 return;
 393         }
 394
 395         /* create device sysfs files */
 396         i = 0;
 397         while ((attr = display_sysfs_attrs[i++]) != NULL) {
 398                 r = device_create_file(&dssdev->dev, attr);
 399                 if (r)
 400                         DSSERR("failed to create sysfs file\n");
 401         }
 402
 403         /* create display? sysfs links */
 404         r = sysfs_create_link(&pdev->dev.kobj, &dssdev->dev.kobj,
 405                         dev_name(&dssdev->dev));
 406         if (r)
 407                 DSSERR("failed to create sysfs display link\n");
 408 }
 409
 410 void dss_uninit_device(struct platform_device *pdev,
 411                 struct omap_dss_device *dssdev)
 412 {
 413         struct device_attribute *attr;
 414         int i = 0;
 415
 416         sysfs_remove_link(&pdev->dev.kobj, dev_name(&dssdev->dev));
 417
 418         while ((attr = display_sysfs_attrs[i++]) != NULL)
 419                 device_remove_file(&dssdev->dev, attr);
 420
 421         if (dssdev->manager)
 422                 dssdev->manager->unset_device(dssdev->manager);
 423 }
 424
 425 static int dss_suspend_device(struct device *dev, void *data)
 426 {
 427         int r;
 428         struct omap_dss_device *dssdev = to_dss_device(dev);
 429
 430         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
 431                 dssdev->activate_after_resume = false;
 432                 return 0;
 433         }
 434
 435         if (!dssdev->driver->suspend) {
 436                 DSSERR("display '%s' doesn't implement suspend\n",
 437                                 dssdev->name);
 438                 return -ENOSYS;
 439         }
 440
 441         r = dssdev->driver->suspend(dssdev);
 442         if (r)
 443                 return r;
 444
 445         dssdev->activate_after_resume = true;
 446
 447         return 0;
 448 }
 449
 450 int dss_suspend_all_devices(void)
 451 {
 452         int r;
 453         struct bus_type *bus = dss_get_bus();
 454
 455         r = bus_for_each_dev(bus, NULL, NULL, dss_suspend_device);
 456         if (r) {
 457                 /* resume all displays that were suspended */
 458                 dss_resume_all_devices();
 459                 return r;
 460         }
 461
 462         return 0;
 463 }
 464
 465 static int dss_resume_device(struct device *dev, void *data)
 466 {
 467         int r;
 468         struct omap_dss_device *dssdev = to_dss_device(dev);
 469
 470         if (dssdev->activate_after_resume && dssdev->driver->resume) {
 471                 r = dssdev->driver->resume(dssdev);
 472                 if (r)
 473                         return r;
 474         }
 475
 476         dssdev->activate_after_resume = false;
 477
 478         return 0;
 479 }
 480
 481 int dss_resume_all_devices(void)
 482 {
 483         struct bus_type *bus = dss_get_bus();
 484
 485         return bus_for_each_dev(bus, NULL, NULL, dss_resume_device);
 486 }
 487
 488 static int dss_disable_device(struct device *dev, void *data)
 489 {
 490         struct omap_dss_device *dssdev = to_dss_device(dev);
 491
 492         if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)
 493                 dssdev->driver->disable(dssdev);
 494
 495         return 0;
 496 }
 497
 498 void dss_disable_all_devices(void)
 499 {
 500         struct bus_type *bus = dss_get_bus();
 501         bus_for_each_dev(bus, NULL, NULL, dss_disable_device);
 502 }
 503
 504
 505 void omap_dss_get_device(struct omap_dss_device *dssdev)
 506 {
 507         get_device(&dssdev->dev);
 508 }
 509 EXPORT_SYMBOL(omap_dss_get_device);
 510
 511 void omap_dss_put_device(struct omap_dss_device *dssdev)
 512 {
 513         put_device(&dssdev->dev);
 514 }
 515 EXPORT_SYMBOL(omap_dss_put_device);
 516
 517 /* ref count of the found device is incremented. ref count
 518  * of from-device is decremented. */
 519 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 520 {
 521         struct device *dev;
 522         struct device *dev_start = NULL;
 523         struct omap_dss_device *dssdev = NULL;
 524
 525         int match(struct device *dev, void *data)
 526         {
 527                 return 1;
 528         }
 529
 530         if (from)
 531                 dev_start = &from->dev;
 532         dev = bus_find_device(dss_get_bus(), dev_start, NULL, match);
 533         if (dev)
 534                 dssdev = to_dss_device(dev);
 535         if (from)
 536                 put_device(&from->dev);
 537
 538         return dssdev;
 539 }
 540 EXPORT_SYMBOL(omap_dss_get_next_device);
 541
 542 struct omap_dss_device *omap_dss_find_device(void *data,
 543                 int (*match)(struct omap_dss_device *dssdev, void *data))
 544 {
 545         struct omap_dss_device *dssdev = NULL;
 546
 547         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 548                 if (match(dssdev, data))
 549                         return dssdev;
 550         }
 551
 552         return NULL;
 553 }
 554 EXPORT_SYMBOL(omap_dss_find_device);
 555
 556 int omap_dss_start_device(struct omap_dss_device *dssdev)
 557 {
 558         if (!dssdev->driver) {
 559                 DSSDBG("no driver\n");
 560                 return -ENODEV;
 561         }
 562
 563         if (!try_module_get(dssdev->dev.driver->owner)) {
 564                 return -ENODEV;
 565         }
 566
 567         return 0;
 568 }
 569 EXPORT_SYMBOL(omap_dss_start_device);
 570
 571 void omap_dss_stop_device(struct omap_dss_device *dssdev)
 572 {
 573         module_put(dssdev->dev.driver->owner);
 574 }
 575 EXPORT_SYMBOL(omap_dss_stop_device);
 576