drivers/video/omap2/dss/dpi.c

   1 /*
   2  * linux/drivers/video/omap2/dss/dpi.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 "DPI"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/delay.h>
  27 #include <linux/export.h>
  28 #include <linux/err.h>
  29 #include <linux/errno.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/string.h>
  33
  34 #include <video/omapdss.h>
  35
  36 #include "dss.h"
  37 #include "dss_features.h"
  38
  39 static struct {
  40         struct platform_device *pdev;
  41
  42         struct regulator *vdds_dsi_reg;
  43         struct platform_device *dsidev;
  44
  45         struct mutex lock;
  46
  47         struct omap_video_timings timings;
  48         struct dss_lcd_mgr_config mgr_config;
  49         int data_lines;
  50
  51         struct omap_dss_device output;
  52 } dpi;
  53
  54 static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
  55 {
  56         /*
  57          * XXX we can't currently use DSI PLL for DPI with OMAP3, as the DSI PLL
  58          * would also be used for DISPC fclk. Meaning, when the DPI output is
  59          * disabled, DISPC clock will be disabled, and TV out will stop.
  60          */
  61         switch (omapdss_get_version()) {
  62         case OMAPDSS_VER_OMAP24xx:
  63         case OMAPDSS_VER_OMAP34xx_ES1:
  64         case OMAPDSS_VER_OMAP34xx_ES3:
  65         case OMAPDSS_VER_OMAP3630:
  66         case OMAPDSS_VER_AM35xx:
  67                 return NULL;
  68
  69         case OMAPDSS_VER_OMAP4430_ES1:
  70         case OMAPDSS_VER_OMAP4430_ES2:
  71         case OMAPDSS_VER_OMAP4:
  72                 switch (channel) {
  73                 case OMAP_DSS_CHANNEL_LCD:
  74                         return dsi_get_dsidev_from_id(0);
  75                 case OMAP_DSS_CHANNEL_LCD2:
  76                         return dsi_get_dsidev_from_id(1);
  77                 default:
  78                         return NULL;
  79                 }
  80
  81         case OMAPDSS_VER_OMAP5:
  82                 switch (channel) {
  83                 case OMAP_DSS_CHANNEL_LCD:
  84                         return dsi_get_dsidev_from_id(0);
  85                 case OMAP_DSS_CHANNEL_LCD3:
  86                         return dsi_get_dsidev_from_id(1);
  87                 default:
  88                         return NULL;
  89                 }
  90
  91         default:
  92                 return NULL;
  93         }
  94 }
  95
  96 static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)
  97 {
  98         switch (channel) {
  99         case OMAP_DSS_CHANNEL_LCD:
 100                 return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
 101         case OMAP_DSS_CHANNEL_LCD2:
 102                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
 103         default:
 104                 /* this shouldn't happen */
 105                 WARN_ON(1);
 106                 return OMAP_DSS_CLK_SRC_FCK;
 107         }
 108 }
 109
 110 struct dpi_clk_calc_ctx {
 111         struct platform_device *dsidev;
 112
 113         /* inputs */
 114
 115         unsigned long pck_min, pck_max;
 116
 117         /* outputs */
 118
 119         struct dsi_clock_info dsi_cinfo;
 120         unsigned long fck;
 121         struct dispc_clock_info dispc_cinfo;
 122 };
 123
 124 static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
 125                 unsigned long pck, void *data)
 126 {
 127         struct dpi_clk_calc_ctx *ctx = data;
 128
 129         /*
 130          * Odd dividers give us uneven duty cycle, causing problem when level
 131          * shifted. So skip all odd dividers when the pixel clock is on the
 132          * higher side.
 133          */
 134         if (ctx->pck_min >= 100000000) {
 135                 if (lckd > 1 && lckd % 2 != 0)
 136                         return false;
 137
 138                 if (pckd > 1 && pckd % 2 != 0)
 139                         return false;
 140         }
 141
 142         ctx->dispc_cinfo.lck_div = lckd;
 143         ctx->dispc_cinfo.pck_div = pckd;
 144         ctx->dispc_cinfo.lck = lck;
 145         ctx->dispc_cinfo.pck = pck;
 146
 147         return true;
 148 }
 149
 150
 151 static bool dpi_calc_hsdiv_cb(int regm_dispc, unsigned long dispc,
 152                 void *data)
 153 {
 154         struct dpi_clk_calc_ctx *ctx = data;
 155
 156         /*
 157          * Odd dividers give us uneven duty cycle, causing problem when level
 158          * shifted. So skip all odd dividers when the pixel clock is on the
 159          * higher side.
 160          */
 161         if (regm_dispc > 1 && regm_dispc % 2 != 0 && ctx->pck_min >= 100000000)
 162                 return false;
 163
 164         ctx->dsi_cinfo.regm_dispc = regm_dispc;
 165         ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc;
 166
 167         return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
 168                         dpi_calc_dispc_cb, ctx);
 169 }
 170
 171
 172 static bool dpi_calc_pll_cb(int regn, int regm, unsigned long fint,
 173                 unsigned long pll,
 174                 void *data)
 175 {
 176         struct dpi_clk_calc_ctx *ctx = data;
 177
 178         ctx->dsi_cinfo.regn = regn;
 179         ctx->dsi_cinfo.regm = regm;
 180         ctx->dsi_cinfo.fint = fint;
 181         ctx->dsi_cinfo.clkin4ddr = pll;
 182
 183         return dsi_hsdiv_calc(ctx->dsidev, pll, ctx->pck_min,
 184                         dpi_calc_hsdiv_cb, ctx);
 185 }
 186
 187 static bool dpi_calc_dss_cb(unsigned long fck, void *data)
 188 {
 189         struct dpi_clk_calc_ctx *ctx = data;
 190
 191         ctx->fck = fck;
 192
 193         return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 194                         dpi_calc_dispc_cb, ctx);
 195 }
 196
 197 static bool dpi_dsi_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 198 {
 199         unsigned long clkin;
 200         unsigned long pll_min, pll_max;
 201
 202         clkin = dsi_get_pll_clkin(dpi.dsidev);
 203
 204         memset(ctx, 0, sizeof(*ctx));
 205         ctx->dsidev = dpi.dsidev;
 206         ctx->pck_min = pck - 1000;
 207         ctx->pck_max = pck + 1000;
 208         ctx->dsi_cinfo.clkin = clkin;
 209
 210         pll_min = 0;
 211         pll_max = 0;
 212
 213         return dsi_pll_calc(dpi.dsidev, clkin,
 214                         pll_min, pll_max,
 215                         dpi_calc_pll_cb, ctx);
 216 }
 217
 218 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 219 {
 220         int i;
 221
 222         /*
 223          * DSS fck gives us very few possibilities, so finding a good pixel
 224          * clock may not be possible. We try multiple times to find the clock,
 225          * each time widening the pixel clock range we look for, up to
 226          * +/- ~15MHz.
 227          */
 228
 229         for (i = 0; i < 25; ++i) {
 230                 bool ok;
 231
 232                 memset(ctx, 0, sizeof(*ctx));
 233                 if (pck > 1000 * i * i * i)
 234                         ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
 235                 else
 236                         ctx->pck_min = 0;
 237                 ctx->pck_max = pck + 1000 * i * i * i;
 238
 239                 ok = dss_div_calc(pck, ctx->pck_min, dpi_calc_dss_cb, ctx);
 240                 if (ok)
 241                         return ok;
 242         }
 243
 244         return false;
 245 }
 246
 247
 248
 249 static int dpi_set_dsi_clk(enum omap_channel channel,
 250                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 251                 int *pck_div)
 252 {
 253         struct dpi_clk_calc_ctx ctx;
 254         int r;
 255         bool ok;
 256
 257         ok = dpi_dsi_clk_calc(pck_req, &ctx);
 258         if (!ok)
 259                 return -EINVAL;
 260
 261         r = dsi_pll_set_clock_div(dpi.dsidev, &ctx.dsi_cinfo);
 262         if (r)
 263                 return r;
 264
 265         dss_select_lcd_clk_source(channel,
 266                         dpi_get_alt_clk_src(channel));
 267
 268         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 269
 270         *fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 271         *lck_div = ctx.dispc_cinfo.lck_div;
 272         *pck_div = ctx.dispc_cinfo.pck_div;
 273
 274         return 0;
 275 }
 276
 277 static int dpi_set_dispc_clk(unsigned long pck_req, unsigned long *fck,
 278                 int *lck_div, int *pck_div)
 279 {
 280         struct dpi_clk_calc_ctx ctx;
 281         int r;
 282         bool ok;
 283
 284         ok = dpi_dss_clk_calc(pck_req, &ctx);
 285         if (!ok)
 286                 return -EINVAL;
 287
 288         r = dss_set_fck_rate(ctx.fck);
 289         if (r)
 290                 return r;
 291
 292         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 293
 294         *fck = ctx.fck;
 295         *lck_div = ctx.dispc_cinfo.lck_div;
 296         *pck_div = ctx.dispc_cinfo.pck_div;
 297
 298         return 0;
 299 }
 300
 301 static int dpi_set_mode(struct omap_overlay_manager *mgr)
 302 {
 303         struct omap_video_timings *t = &dpi.timings;
 304         int lck_div = 0, pck_div = 0;
 305         unsigned long fck = 0;
 306         unsigned long pck;
 307         int r = 0;
 308
 309         if (dpi.dsidev)
 310                 r = dpi_set_dsi_clk(mgr->id, t->pixel_clock * 1000, &fck,
 311                                 &lck_div, &pck_div);
 312         else
 313                 r = dpi_set_dispc_clk(t->pixel_clock * 1000, &fck,
 314                                 &lck_div, &pck_div);
 315         if (r)
 316                 return r;
 317
 318         pck = fck / lck_div / pck_div / 1000;
 319
 320         if (pck != t->pixel_clock) {
 321                 DSSWARN("Could not find exact pixel clock. "
 322                                 "Requested %d kHz, got %lu kHz\n",
 323                                 t->pixel_clock, pck);
 324
 325                 t->pixel_clock = pck;
 326         }
 327
 328         dss_mgr_set_timings(mgr, t);
 329
 330         return 0;
 331 }
 332
 333 static void dpi_config_lcd_manager(struct omap_overlay_manager *mgr)
 334 {
 335         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 336
 337         dpi.mgr_config.stallmode = false;
 338         dpi.mgr_config.fifohandcheck = false;
 339
 340         dpi.mgr_config.video_port_width = dpi.data_lines;
 341
 342         dpi.mgr_config.lcden_sig_polarity = 0;
 343
 344         dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
 345 }
 346
 347 static int dpi_display_enable(struct omap_dss_device *dssdev)
 348 {
 349         struct omap_dss_device *out = &dpi.output;
 350         int r;
 351
 352         mutex_lock(&dpi.lock);
 353
 354         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
 355                 DSSERR("no VDSS_DSI regulator\n");
 356                 r = -ENODEV;
 357                 goto err_no_reg;
 358         }
 359
 360         if (out == NULL || out->manager == NULL) {
 361                 DSSERR("failed to enable display: no output/manager\n");
 362                 r = -ENODEV;
 363                 goto err_no_out_mgr;
 364         }
 365
 366         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 367                 r = regulator_enable(dpi.vdds_dsi_reg);
 368                 if (r)
 369                         goto err_reg_enable;
 370         }
 371
 372         r = dispc_runtime_get();
 373         if (r)
 374                 goto err_get_dispc;
 375
 376         r = dss_dpi_select_source(out->manager->id);
 377         if (r)
 378                 goto err_src_sel;
 379
 380         if (dpi.dsidev) {
 381                 r = dsi_runtime_get(dpi.dsidev);
 382                 if (r)
 383                         goto err_get_dsi;
 384
 385                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 386                 if (r)
 387                         goto err_dsi_pll_init;
 388         }
 389
 390         r = dpi_set_mode(out->manager);
 391         if (r)
 392                 goto err_set_mode;
 393
 394         dpi_config_lcd_manager(out->manager);
 395
 396         mdelay(2);
 397
 398         r = dss_mgr_enable(out->manager);
 399         if (r)
 400                 goto err_mgr_enable;
 401
 402         mutex_unlock(&dpi.lock);
 403
 404         return 0;
 405
 406 err_mgr_enable:
 407 err_set_mode:
 408         if (dpi.dsidev)
 409                 dsi_pll_uninit(dpi.dsidev, true);
 410 err_dsi_pll_init:
 411         if (dpi.dsidev)
 412                 dsi_runtime_put(dpi.dsidev);
 413 err_get_dsi:
 414 err_src_sel:
 415         dispc_runtime_put();
 416 err_get_dispc:
 417         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 418                 regulator_disable(dpi.vdds_dsi_reg);
 419 err_reg_enable:
 420 err_no_out_mgr:
 421 err_no_reg:
 422         mutex_unlock(&dpi.lock);
 423         return r;
 424 }
 425
 426 static void dpi_display_disable(struct omap_dss_device *dssdev)
 427 {
 428         struct omap_overlay_manager *mgr = dpi.output.manager;
 429
 430         mutex_lock(&dpi.lock);
 431
 432         dss_mgr_disable(mgr);
 433
 434         if (dpi.dsidev) {
 435                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 436                 dsi_pll_uninit(dpi.dsidev, true);
 437                 dsi_runtime_put(dpi.dsidev);
 438         }
 439
 440         dispc_runtime_put();
 441
 442         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 443                 regulator_disable(dpi.vdds_dsi_reg);
 444
 445         mutex_unlock(&dpi.lock);
 446 }
 447
 448 static void dpi_set_timings(struct omap_dss_device *dssdev,
 449                 struct omap_video_timings *timings)
 450 {
 451         DSSDBG("dpi_set_timings\n");
 452
 453         mutex_lock(&dpi.lock);
 454
 455         dpi.timings = *timings;
 456
 457         mutex_unlock(&dpi.lock);
 458 }
 459
 460 static void dpi_get_timings(struct omap_dss_device *dssdev,
 461                 struct omap_video_timings *timings)
 462 {
 463         mutex_lock(&dpi.lock);
 464
 465         *timings = dpi.timings;
 466
 467         mutex_unlock(&dpi.lock);
 468 }
 469
 470 static int dpi_check_timings(struct omap_dss_device *dssdev,
 471                         struct omap_video_timings *timings)
 472 {
 473         struct omap_overlay_manager *mgr = dpi.output.manager;
 474         int lck_div, pck_div;
 475         unsigned long fck;
 476         unsigned long pck;
 477         struct dpi_clk_calc_ctx ctx;
 478         bool ok;
 479
 480         if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
 481                 return -EINVAL;
 482
 483         if (timings->pixel_clock == 0)
 484                 return -EINVAL;
 485
 486         if (dpi.dsidev) {
 487                 ok = dpi_dsi_clk_calc(timings->pixel_clock * 1000, &ctx);
 488                 if (!ok)
 489                         return -EINVAL;
 490
 491                 fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 492         } else {
 493                 ok = dpi_dss_clk_calc(timings->pixel_clock * 1000, &ctx);
 494                 if (!ok)
 495                         return -EINVAL;
 496
 497                 fck = ctx.fck;
 498         }
 499
 500         lck_div = ctx.dispc_cinfo.lck_div;
 501         pck_div = ctx.dispc_cinfo.pck_div;
 502
 503         pck = fck / lck_div / pck_div / 1000;
 504
 505         timings->pixel_clock = pck;
 506
 507         return 0;
 508 }
 509
 510 static void dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 511 {
 512         mutex_lock(&dpi.lock);
 513
 514         dpi.data_lines = data_lines;
 515
 516         mutex_unlock(&dpi.lock);
 517 }
 518
 519 static int dpi_verify_dsi_pll(struct platform_device *dsidev)
 520 {
 521         int r;
 522
 523         /* do initial setup with the PLL to see if it is operational */
 524
 525         r = dsi_runtime_get(dsidev);
 526         if (r)
 527                 return r;
 528
 529         r = dsi_pll_init(dsidev, 0, 1);
 530         if (r) {
 531                 dsi_runtime_put(dsidev);
 532                 return r;
 533         }
 534
 535         dsi_pll_uninit(dsidev, true);
 536         dsi_runtime_put(dsidev);
 537
 538         return 0;
 539 }
 540
 541 static int dpi_init_regulator(void)
 542 {
 543         struct regulator *vdds_dsi;
 544
 545         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 546                 return 0;
 547
 548         if (dpi.vdds_dsi_reg)
 549                 return 0;
 550
 551         vdds_dsi = devm_regulator_get(&dpi.pdev->dev, "vdds_dsi");
 552         if (IS_ERR(vdds_dsi)) {
 553                 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
 554                         DSSERR("can't get VDDS_DSI regulator\n");
 555                 return PTR_ERR(vdds_dsi);
 556         }
 557
 558         dpi.vdds_dsi_reg = vdds_dsi;
 559
 560         return 0;
 561 }
 562
 563 static void dpi_init_pll(void)
 564 {
 565         struct platform_device *dsidev;
 566
 567         if (dpi.dsidev)
 568                 return;
 569
 570         dsidev = dpi_get_dsidev(dpi.output.dispc_channel);
 571         if (!dsidev)
 572                 return;
 573
 574         if (dpi_verify_dsi_pll(dsidev)) {
 575                 DSSWARN("DSI PLL not operational\n");
 576                 return;
 577         }
 578
 579         dpi.dsidev = dsidev;
 580 }
 581
 582 /*
 583  * Return a hardcoded channel for the DPI output. This should work for
 584  * current use cases, but this can be later expanded to either resolve
 585  * the channel in some more dynamic manner, or get the channel as a user
 586  * parameter.
 587  */
 588 static enum omap_channel dpi_get_channel(void)
 589 {
 590         switch (omapdss_get_version()) {
 591         case OMAPDSS_VER_OMAP24xx:
 592         case OMAPDSS_VER_OMAP34xx_ES1:
 593         case OMAPDSS_VER_OMAP34xx_ES3:
 594         case OMAPDSS_VER_OMAP3630:
 595         case OMAPDSS_VER_AM35xx:
 596                 return OMAP_DSS_CHANNEL_LCD;
 597
 598         case OMAPDSS_VER_OMAP4430_ES1:
 599         case OMAPDSS_VER_OMAP4430_ES2:
 600         case OMAPDSS_VER_OMAP4:
 601                 return OMAP_DSS_CHANNEL_LCD2;
 602
 603         case OMAPDSS_VER_OMAP5:
 604                 return OMAP_DSS_CHANNEL_LCD3;
 605
 606         default:
 607                 DSSWARN("unsupported DSS version\n");
 608                 return OMAP_DSS_CHANNEL_LCD;
 609         }
 610 }
 611
 612 static int dpi_connect(struct omap_dss_device *dssdev,
 613                 struct omap_dss_device *dst)
 614 {
 615         struct omap_overlay_manager *mgr;
 616         int r;
 617
 618         r = dpi_init_regulator();
 619         if (r)
 620                 return r;
 621
 622         dpi_init_pll();
 623
 624         mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
 625         if (!mgr)
 626                 return -ENODEV;
 627
 628         r = dss_mgr_connect(mgr, dssdev);
 629         if (r)
 630                 return r;
 631
 632         r = omapdss_output_set_device(dssdev, dst);
 633         if (r) {
 634                 DSSERR("failed to connect output to new device: %s\n",
 635                                 dst->name);
 636                 dss_mgr_disconnect(mgr, dssdev);
 637                 return r;
 638         }
 639
 640         return 0;
 641 }
 642
 643 static void dpi_disconnect(struct omap_dss_device *dssdev,
 644                 struct omap_dss_device *dst)
 645 {
 646         WARN_ON(dst != dssdev->dst);
 647
 648         if (dst != dssdev->dst)
 649                 return;
 650
 651         omapdss_output_unset_device(dssdev);
 652
 653         if (dssdev->manager)
 654                 dss_mgr_disconnect(dssdev->manager, dssdev);
 655 }
 656
 657 static const struct omapdss_dpi_ops dpi_ops = {
 658         .connect = dpi_connect,
 659         .disconnect = dpi_disconnect,
 660
 661         .enable = dpi_display_enable,
 662         .disable = dpi_display_disable,
 663
 664         .check_timings = dpi_check_timings,
 665         .set_timings = dpi_set_timings,
 666         .get_timings = dpi_get_timings,
 667
 668         .set_data_lines = dpi_set_data_lines,
 669 };
 670
 671 static void dpi_init_output(struct platform_device *pdev)
 672 {
 673         struct omap_dss_device *out = &dpi.output;
 674
 675         out->dev = &pdev->dev;
 676         out->id = OMAP_DSS_OUTPUT_DPI;
 677         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 678         out->name = "dpi.0";
 679         out->dispc_channel = dpi_get_channel();
 680         out->ops.dpi = &dpi_ops;
 681         out->owner = THIS_MODULE;
 682
 683         omapdss_register_output(out);
 684 }
 685
 686 static void __exit dpi_uninit_output(struct platform_device *pdev)
 687 {
 688         struct omap_dss_device *out = &dpi.output;
 689
 690         omapdss_unregister_output(out);
 691 }
 692
 693 static int omap_dpi_probe(struct platform_device *pdev)
 694 {
 695         dpi.pdev = pdev;
 696
 697         mutex_init(&dpi.lock);
 698
 699         dpi_init_output(pdev);
 700
 701         return 0;
 702 }
 703
 704 static int __exit omap_dpi_remove(struct platform_device *pdev)
 705 {
 706         dpi_uninit_output(pdev);
 707
 708         return 0;
 709 }
 710
 711 static struct platform_driver omap_dpi_driver = {
 712         .probe          = omap_dpi_probe,
 713         .remove         = __exit_p(omap_dpi_remove),
 714         .driver         = {
 715                 .name   = "omapdss_dpi",
 716                 .owner  = THIS_MODULE,
 717         },
 718 };
 719
 720 int __init dpi_init_platform_driver(void)
 721 {
 722         return platform_driver_register(&omap_dpi_driver);
 723 }
 724
 725 void __exit dpi_uninit_platform_driver(void)
 726 {
 727         platform_driver_unregister(&omap_dpi_driver);
 728 }