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_output 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         struct dss_clock_info dss_cinfo;
 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 >= 1000000) {
 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 >= 1000000)
 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(int fckd, unsigned long fck, void *data)
 188 {
 189         struct dpi_clk_calc_ctx *ctx = data;
 190
 191         ctx->dss_cinfo.fck = fck;
 192         ctx->dss_cinfo.fck_div = fckd;
 193
 194         return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 195                         dpi_calc_dispc_cb, ctx);
 196 }
 197
 198 static bool dpi_dsi_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 199 {
 200         unsigned long clkin;
 201         unsigned long pll_min, pll_max;
 202
 203         clkin = dsi_get_pll_clkin(dpi.dsidev);
 204
 205         memset(ctx, 0, sizeof(*ctx));
 206         ctx->dsidev = dpi.dsidev;
 207         ctx->pck_min = pck - 1000;
 208         ctx->pck_max = pck + 1000;
 209         ctx->dsi_cinfo.clkin = clkin;
 210
 211         pll_min = 0;
 212         pll_max = 0;
 213
 214         return dsi_pll_calc(dpi.dsidev, clkin,
 215                         pll_min, pll_max,
 216                         dpi_calc_pll_cb, ctx);
 217 }
 218
 219 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 220 {
 221         int i;
 222
 223         /*
 224          * DSS fck gives us very few possibilities, so finding a good pixel
 225          * clock may not be possible. We try multiple times to find the clock,
 226          * each time widening the pixel clock range we look for, up to
 227          * +/- ~15MHz.
 228          */
 229
 230         for (i = 0; i < 25; ++i) {
 231                 bool ok;
 232
 233                 memset(ctx, 0, sizeof(*ctx));
 234                 if (pck > 1000 * i * i * i)
 235                         ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
 236                 else
 237                         ctx->pck_min = 0;
 238                 ctx->pck_max = pck + 1000 * i * i * i;
 239
 240                 ok = dss_div_calc(ctx->pck_min, dpi_calc_dss_cb, ctx);
 241                 if (ok)
 242                         return ok;
 243         }
 244
 245         return false;
 246 }
 247
 248
 249
 250 static int dpi_set_dsi_clk(enum omap_channel channel,
 251                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 252                 int *pck_div)
 253 {
 254         struct dpi_clk_calc_ctx ctx;
 255         int r;
 256         bool ok;
 257
 258         ok = dpi_dsi_clk_calc(pck_req, &ctx);
 259         if (!ok)
 260                 return -EINVAL;
 261
 262         r = dsi_pll_set_clock_div(dpi.dsidev, &ctx.dsi_cinfo);
 263         if (r)
 264                 return r;
 265
 266         dss_select_lcd_clk_source(channel,
 267                         dpi_get_alt_clk_src(channel));
 268
 269         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 270
 271         *fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 272         *lck_div = ctx.dispc_cinfo.lck_div;
 273         *pck_div = ctx.dispc_cinfo.pck_div;
 274
 275         return 0;
 276 }
 277
 278 static int dpi_set_dispc_clk(unsigned long pck_req, unsigned long *fck,
 279                 int *lck_div, int *pck_div)
 280 {
 281         struct dpi_clk_calc_ctx ctx;
 282         int r;
 283         bool ok;
 284
 285         ok = dpi_dss_clk_calc(pck_req, &ctx);
 286         if (!ok)
 287                 return -EINVAL;
 288
 289         r = dss_set_clock_div(&ctx.dss_cinfo);
 290         if (r)
 291                 return r;
 292
 293         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 294
 295         *fck = ctx.dss_cinfo.fck;
 296         *lck_div = ctx.dispc_cinfo.lck_div;
 297         *pck_div = ctx.dispc_cinfo.pck_div;
 298
 299         return 0;
 300 }
 301
 302 static int dpi_set_mode(struct omap_overlay_manager *mgr)
 303 {
 304         struct omap_video_timings *t = &dpi.timings;
 305         int lck_div = 0, pck_div = 0;
 306         unsigned long fck = 0;
 307         unsigned long pck;
 308         int r = 0;
 309
 310         if (dpi.dsidev)
 311                 r = dpi_set_dsi_clk(mgr->id, t->pixel_clock * 1000, &fck,
 312                                 &lck_div, &pck_div);
 313         else
 314                 r = dpi_set_dispc_clk(t->pixel_clock * 1000, &fck,
 315                                 &lck_div, &pck_div);
 316         if (r)
 317                 return r;
 318
 319         pck = fck / lck_div / pck_div / 1000;
 320
 321         if (pck != t->pixel_clock) {
 322                 DSSWARN("Could not find exact pixel clock. "
 323                                 "Requested %d kHz, got %lu kHz\n",
 324                                 t->pixel_clock, pck);
 325
 326                 t->pixel_clock = pck;
 327         }
 328
 329         dss_mgr_set_timings(mgr, t);
 330
 331         return 0;
 332 }
 333
 334 static void dpi_config_lcd_manager(struct omap_overlay_manager *mgr)
 335 {
 336         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 337
 338         dpi.mgr_config.stallmode = false;
 339         dpi.mgr_config.fifohandcheck = false;
 340
 341         dpi.mgr_config.video_port_width = dpi.data_lines;
 342
 343         dpi.mgr_config.lcden_sig_polarity = 0;
 344
 345         dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
 346 }
 347
 348 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 349 {
 350         struct omap_dss_output *out = &dpi.output;
 351         int r;
 352
 353         mutex_lock(&dpi.lock);
 354
 355         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
 356                 DSSERR("no VDSS_DSI regulator\n");
 357                 r = -ENODEV;
 358                 goto err_no_reg;
 359         }
 360
 361         if (out == NULL || out->manager == NULL) {
 362                 DSSERR("failed to enable display: no output/manager\n");
 363                 r = -ENODEV;
 364                 goto err_no_out_mgr;
 365         }
 366
 367         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 368                 r = regulator_enable(dpi.vdds_dsi_reg);
 369                 if (r)
 370                         goto err_reg_enable;
 371         }
 372
 373         r = dispc_runtime_get();
 374         if (r)
 375                 goto err_get_dispc;
 376
 377         r = dss_dpi_select_source(out->manager->id);
 378         if (r)
 379                 goto err_src_sel;
 380
 381         if (dpi.dsidev) {
 382                 r = dsi_runtime_get(dpi.dsidev);
 383                 if (r)
 384                         goto err_get_dsi;
 385
 386                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 387                 if (r)
 388                         goto err_dsi_pll_init;
 389         }
 390
 391         r = dpi_set_mode(out->manager);
 392         if (r)
 393                 goto err_set_mode;
 394
 395         dpi_config_lcd_manager(out->manager);
 396
 397         mdelay(2);
 398
 399         r = dss_mgr_enable(out->manager);
 400         if (r)
 401                 goto err_mgr_enable;
 402
 403         mutex_unlock(&dpi.lock);
 404
 405         return 0;
 406
 407 err_mgr_enable:
 408 err_set_mode:
 409         if (dpi.dsidev)
 410                 dsi_pll_uninit(dpi.dsidev, true);
 411 err_dsi_pll_init:
 412         if (dpi.dsidev)
 413                 dsi_runtime_put(dpi.dsidev);
 414 err_get_dsi:
 415 err_src_sel:
 416         dispc_runtime_put();
 417 err_get_dispc:
 418         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 419                 regulator_disable(dpi.vdds_dsi_reg);
 420 err_reg_enable:
 421 err_no_out_mgr:
 422 err_no_reg:
 423         mutex_unlock(&dpi.lock);
 424         return r;
 425 }
 426 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 427
 428 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 429 {
 430         struct omap_overlay_manager *mgr = dpi.output.manager;
 431
 432         mutex_lock(&dpi.lock);
 433
 434         dss_mgr_disable(mgr);
 435
 436         if (dpi.dsidev) {
 437                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 438                 dsi_pll_uninit(dpi.dsidev, true);
 439                 dsi_runtime_put(dpi.dsidev);
 440         }
 441
 442         dispc_runtime_put();
 443
 444         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 445                 regulator_disable(dpi.vdds_dsi_reg);
 446
 447         mutex_unlock(&dpi.lock);
 448 }
 449 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 450
 451 void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
 452                 struct omap_video_timings *timings)
 453 {
 454         DSSDBG("dpi_set_timings\n");
 455
 456         mutex_lock(&dpi.lock);
 457
 458         dpi.timings = *timings;
 459
 460         mutex_unlock(&dpi.lock);
 461 }
 462 EXPORT_SYMBOL(omapdss_dpi_set_timings);
 463
 464 int dpi_check_timings(struct omap_dss_device *dssdev,
 465                         struct omap_video_timings *timings)
 466 {
 467         struct omap_overlay_manager *mgr = dpi.output.manager;
 468         int lck_div, pck_div;
 469         unsigned long fck;
 470         unsigned long pck;
 471         struct dpi_clk_calc_ctx ctx;
 472         bool ok;
 473
 474         if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
 475                 return -EINVAL;
 476
 477         if (timings->pixel_clock == 0)
 478                 return -EINVAL;
 479
 480         if (dpi.dsidev) {
 481                 ok = dpi_dsi_clk_calc(timings->pixel_clock * 1000, &ctx);
 482                 if (!ok)
 483                         return -EINVAL;
 484
 485                 fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 486         } else {
 487                 ok = dpi_dss_clk_calc(timings->pixel_clock * 1000, &ctx);
 488                 if (!ok)
 489                         return -EINVAL;
 490
 491                 fck = ctx.dss_cinfo.fck;
 492         }
 493
 494         lck_div = ctx.dispc_cinfo.lck_div;
 495         pck_div = ctx.dispc_cinfo.pck_div;
 496
 497         pck = fck / lck_div / pck_div / 1000;
 498
 499         timings->pixel_clock = pck;
 500
 501         return 0;
 502 }
 503 EXPORT_SYMBOL(dpi_check_timings);
 504
 505 void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 506 {
 507         mutex_lock(&dpi.lock);
 508
 509         dpi.data_lines = data_lines;
 510
 511         mutex_unlock(&dpi.lock);
 512 }
 513 EXPORT_SYMBOL(omapdss_dpi_set_data_lines);
 514
 515 static int dpi_verify_dsi_pll(struct platform_device *dsidev)
 516 {
 517         int r;
 518
 519         /* do initial setup with the PLL to see if it is operational */
 520
 521         r = dsi_runtime_get(dsidev);
 522         if (r)
 523                 return r;
 524
 525         r = dsi_pll_init(dsidev, 0, 1);
 526         if (r) {
 527                 dsi_runtime_put(dsidev);
 528                 return r;
 529         }
 530
 531         dsi_pll_uninit(dsidev, true);
 532         dsi_runtime_put(dsidev);
 533
 534         return 0;
 535 }
 536
 537 static int dpi_init_regulator(void)
 538 {
 539         struct regulator *vdds_dsi;
 540
 541         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 542                 return 0;
 543
 544         if (dpi.vdds_dsi_reg)
 545                 return 0;
 546
 547         vdds_dsi = dss_get_vdds_dsi();
 548
 549         if (IS_ERR(vdds_dsi)) {
 550                 vdds_dsi = devm_regulator_get(&dpi.pdev->dev, "vdds_dsi");
 551                 if (IS_ERR(vdds_dsi)) {
 552                         DSSERR("can't get VDDS_DSI regulator\n");
 553                         return PTR_ERR(vdds_dsi);
 554                 }
 555         }
 556
 557         dpi.vdds_dsi_reg = vdds_dsi;
 558
 559         return 0;
 560 }
 561
 562 static void dpi_init_pll(void)
 563 {
 564         struct platform_device *dsidev;
 565
 566         if (dpi.dsidev)
 567                 return;
 568
 569         dsidev = dpi_get_dsidev(dpi.output.dispc_channel);
 570         if (!dsidev)
 571                 return;
 572
 573         if (dpi_verify_dsi_pll(dsidev)) {
 574                 DSSWARN("DSI PLL not operational\n");
 575                 return;
 576         }
 577
 578         dpi.dsidev = dsidev;
 579 }
 580
 581 /*
 582  * Return a hardcoded channel for the DPI output. This should work for
 583  * current use cases, but this can be later expanded to either resolve
 584  * the channel in some more dynamic manner, or get the channel as a user
 585  * parameter.
 586  */
 587 static enum omap_channel dpi_get_channel(void)
 588 {
 589         switch (omapdss_get_version()) {
 590         case OMAPDSS_VER_OMAP24xx:
 591         case OMAPDSS_VER_OMAP34xx_ES1:
 592         case OMAPDSS_VER_OMAP34xx_ES3:
 593         case OMAPDSS_VER_OMAP3630:
 594         case OMAPDSS_VER_AM35xx:
 595                 return OMAP_DSS_CHANNEL_LCD;
 596
 597         case OMAPDSS_VER_OMAP4430_ES1:
 598         case OMAPDSS_VER_OMAP4430_ES2:
 599         case OMAPDSS_VER_OMAP4:
 600                 return OMAP_DSS_CHANNEL_LCD2;
 601
 602         case OMAPDSS_VER_OMAP5:
 603                 return OMAP_DSS_CHANNEL_LCD3;
 604
 605         default:
 606                 DSSWARN("unsupported DSS version\n");
 607                 return OMAP_DSS_CHANNEL_LCD;
 608         }
 609 }
 610
 611 static struct omap_dss_device *dpi_find_dssdev(struct platform_device *pdev)
 612 {
 613         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 614         const char *def_disp_name = omapdss_get_default_display_name();
 615         struct omap_dss_device *def_dssdev;
 616         int i;
 617
 618         def_dssdev = NULL;
 619
 620         for (i = 0; i < pdata->num_devices; ++i) {
 621                 struct omap_dss_device *dssdev = pdata->devices[i];
 622
 623                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 624                         continue;
 625
 626                 if (def_dssdev == NULL)
 627                         def_dssdev = dssdev;
 628
 629                 if (def_disp_name != NULL &&
 630                                 strcmp(dssdev->name, def_disp_name) == 0) {
 631                         def_dssdev = dssdev;
 632                         break;
 633                 }
 634         }
 635
 636         return def_dssdev;
 637 }
 638
 639 static int dpi_probe_pdata(struct platform_device *dpidev)
 640 {
 641         struct omap_dss_device *plat_dssdev;
 642         struct omap_dss_device *dssdev;
 643         int r;
 644
 645         plat_dssdev = dpi_find_dssdev(dpidev);
 646
 647         if (!plat_dssdev)
 648                 return 0;
 649
 650         r = dpi_init_regulator();
 651         if (r)
 652                 return r;
 653
 654         dpi_init_pll();
 655
 656         dssdev = dss_alloc_and_init_device(&dpidev->dev);
 657         if (!dssdev)
 658                 return -ENOMEM;
 659
 660         dss_copy_device_pdata(dssdev, plat_dssdev);
 661
 662         r = omapdss_output_set_device(&dpi.output, dssdev);
 663         if (r) {
 664                 DSSERR("failed to connect output to new device: %s\n",
 665                                 dssdev->name);
 666                 dss_put_device(dssdev);
 667                 return r;
 668         }
 669
 670         r = dss_add_device(dssdev);
 671         if (r) {
 672                 DSSERR("device %s register failed: %d\n", dssdev->name, r);
 673                 omapdss_output_unset_device(&dpi.output);
 674                 dss_put_device(dssdev);
 675                 return r;
 676         }
 677
 678         return 0;
 679 }
 680
 681 static void dpi_init_output(struct platform_device *pdev)
 682 {
 683         struct omap_dss_output *out = &dpi.output;
 684
 685         out->pdev = pdev;
 686         out->id = OMAP_DSS_OUTPUT_DPI;
 687         out->type = OMAP_DISPLAY_TYPE_DPI;
 688         out->name = "dpi.0";
 689         out->dispc_channel = dpi_get_channel();
 690
 691         dss_register_output(out);
 692 }
 693
 694 static void __exit dpi_uninit_output(struct platform_device *pdev)
 695 {
 696         struct omap_dss_output *out = &dpi.output;
 697
 698         dss_unregister_output(out);
 699 }
 700
 701 static int omap_dpi_probe(struct platform_device *pdev)
 702 {
 703         int r;
 704
 705         dpi.pdev = pdev;
 706
 707         mutex_init(&dpi.lock);
 708
 709         dpi_init_output(pdev);
 710
 711         if (pdev->dev.platform_data) {
 712                 r = dpi_probe_pdata(pdev);
 713                 if (r)
 714                         goto err_probe;
 715         }
 716
 717         return 0;
 718
 719 err_probe:
 720         dpi_uninit_output(pdev);
 721         return r;
 722 }
 723
 724 static int __exit omap_dpi_remove(struct platform_device *pdev)
 725 {
 726         dss_unregister_child_devices(&pdev->dev);
 727
 728         dpi_uninit_output(pdev);
 729
 730         return 0;
 731 }
 732
 733 static struct platform_driver omap_dpi_driver = {
 734         .probe          = omap_dpi_probe,
 735         .remove         = __exit_p(omap_dpi_remove),
 736         .driver         = {
 737                 .name   = "omapdss_dpi",
 738                 .owner  = THIS_MODULE,
 739         },
 740 };
 741
 742 int __init dpi_init_platform_driver(void)
 743 {
 744         return platform_driver_register(&omap_dpi_driver);
 745 }
 746
 747 void __exit dpi_uninit_platform_driver(void)
 748 {
 749         platform_driver_unregister(&omap_dpi_driver);
 750 }