1 /* 2 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 3 * Authors: 4 * Inki Dae <inki.dae@samsung.com> 5 * Joonyoung Shim <jy0922.shim@samsung.com> 6 * Seung-Woo Kim <sw0312.kim@samsung.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/pm_runtime.h> 15 #include <drm/drmP.h> 16 #include <drm/drm_atomic.h> 17 #include <drm/drm_atomic_helper.h> 18 #include <drm/drm_crtc_helper.h> 19 20 #include <linux/component.h> 21 22 #include <drm/exynos_drm.h> 23 24 #include "exynos_drm_drv.h" 25 #include "exynos_drm_crtc.h" 26 #include "exynos_drm_fbdev.h" 27 #include "exynos_drm_fb.h" 28 #include "exynos_drm_gem.h" 29 #include "exynos_drm_plane.h" 30 #include "exynos_drm_vidi.h" 31 #include "exynos_drm_g2d.h" 32 #include "exynos_drm_ipp.h" 33 #include "exynos_drm_iommu.h" 34 35 #define DRIVER_NAME "exynos" 36 #define DRIVER_DESC "Samsung SoC DRM" 37 #define DRIVER_DATE "20110530" 38 #define DRIVER_MAJOR 1 39 #define DRIVER_MINOR 0 40 41 struct exynos_atomic_commit { 42 struct work_struct work; 43 struct drm_device *dev; 44 struct drm_atomic_state *state; 45 u32 crtcs; 46 }; 47 48 static void exynos_atomic_wait_for_commit(struct drm_atomic_state *state) 49 { 50 struct drm_crtc_state *crtc_state; 51 struct drm_crtc *crtc; 52 int i, ret; 53 54 for_each_crtc_in_state(state, crtc, crtc_state, i) { 55 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc); 56 57 if (!crtc->state->enable) 58 continue; 59 60 ret = drm_crtc_vblank_get(crtc); 61 if (ret) 62 continue; 63 64 exynos_drm_crtc_wait_pending_update(exynos_crtc); 65 drm_crtc_vblank_put(crtc); 66 } 67 } 68 69 static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit) 70 { 71 struct drm_device *dev = commit->dev; 72 struct exynos_drm_private *priv = dev->dev_private; 73 struct drm_atomic_state *state = commit->state; 74 struct drm_plane *plane; 75 struct drm_crtc *crtc; 76 struct drm_plane_state *plane_state; 77 struct drm_crtc_state *crtc_state; 78 int i; 79 80 drm_atomic_helper_commit_modeset_disables(dev, state); 81 82 drm_atomic_helper_commit_modeset_enables(dev, state); 83 84 /* 85 * Exynos can't update planes with CRTCs and encoders disabled, 86 * its updates routines, specially for FIMD, requires the clocks 87 * to be enabled. So it is necessary to handle the modeset operations 88 * *before* the commit_planes() step, this way it will always 89 * have the relevant clocks enabled to perform the update. 90 */ 91 92 for_each_crtc_in_state(state, crtc, crtc_state, i) { 93 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc); 94 95 atomic_set(&exynos_crtc->pending_update, 0); 96 } 97 98 for_each_plane_in_state(state, plane, plane_state, i) { 99 struct exynos_drm_crtc *exynos_crtc = 100 to_exynos_crtc(plane->crtc); 101 102 if (!plane->crtc) 103 continue; 104 105 atomic_inc(&exynos_crtc->pending_update); 106 } 107 108 drm_atomic_helper_commit_planes(dev, state, false); 109 110 exynos_atomic_wait_for_commit(state); 111 112 drm_atomic_helper_cleanup_planes(dev, state); 113 114 drm_atomic_state_free(state); 115 116 spin_lock(&priv->lock); 117 priv->pending &= ~commit->crtcs; 118 spin_unlock(&priv->lock); 119 120 wake_up_all(&priv->wait); 121 122 kfree(commit); 123 } 124 125 static void exynos_drm_atomic_work(struct work_struct *work) 126 { 127 struct exynos_atomic_commit *commit = container_of(work, 128 struct exynos_atomic_commit, work); 129 130 exynos_atomic_commit_complete(commit); 131 } 132 133 static struct device *exynos_drm_get_dma_device(void); 134 135 static int exynos_drm_load(struct drm_device *dev, unsigned long flags) 136 { 137 struct exynos_drm_private *private; 138 struct drm_encoder *encoder; 139 unsigned int clone_mask; 140 int cnt, ret; 141 142 private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL); 143 if (!private) 144 return -ENOMEM; 145 146 init_waitqueue_head(&private->wait); 147 spin_lock_init(&private->lock); 148 149 dev_set_drvdata(dev->dev, dev); 150 dev->dev_private = (void *)private; 151 152 /* the first real CRTC device is used for all dma mapping operations */ 153 private->dma_dev = exynos_drm_get_dma_device(); 154 if (!private->dma_dev) { 155 DRM_ERROR("no device found for DMA mapping operations.\n"); 156 ret = -ENODEV; 157 goto err_free_private; 158 } 159 DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n", 160 dev_name(private->dma_dev)); 161 162 /* 163 * create mapping to manage iommu table and set a pointer to iommu 164 * mapping structure to iommu_mapping of private data. 165 * also this iommu_mapping can be used to check if iommu is supported 166 * or not. 167 */ 168 ret = drm_create_iommu_mapping(dev); 169 if (ret < 0) { 170 DRM_ERROR("failed to create iommu mapping.\n"); 171 goto err_free_private; 172 } 173 174 drm_mode_config_init(dev); 175 176 exynos_drm_mode_config_init(dev); 177 178 /* setup possible_clones. */ 179 cnt = 0; 180 clone_mask = 0; 181 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 182 clone_mask |= (1 << (cnt++)); 183 184 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 185 encoder->possible_clones = clone_mask; 186 187 platform_set_drvdata(dev->platformdev, dev); 188 189 /* Try to bind all sub drivers. */ 190 ret = component_bind_all(dev->dev, dev); 191 if (ret) 192 goto err_mode_config_cleanup; 193 194 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 195 if (ret) 196 goto err_unbind_all; 197 198 /* Probe non kms sub drivers and virtual display driver. */ 199 ret = exynos_drm_device_subdrv_probe(dev); 200 if (ret) 201 goto err_cleanup_vblank; 202 203 drm_mode_config_reset(dev); 204 205 /* 206 * enable drm irq mode. 207 * - with irq_enabled = true, we can use the vblank feature. 208 * 209 * P.S. note that we wouldn't use drm irq handler but 210 * just specific driver own one instead because 211 * drm framework supports only one irq handler. 212 */ 213 dev->irq_enabled = true; 214 215 /* init kms poll for handling hpd */ 216 drm_kms_helper_poll_init(dev); 217 218 /* force connectors detection */ 219 drm_helper_hpd_irq_event(dev); 220 221 return 0; 222 223 err_cleanup_vblank: 224 drm_vblank_cleanup(dev); 225 err_unbind_all: 226 component_unbind_all(dev->dev, dev); 227 err_mode_config_cleanup: 228 drm_mode_config_cleanup(dev); 229 drm_release_iommu_mapping(dev); 230 err_free_private: 231 kfree(private); 232 233 return ret; 234 } 235 236 static int exynos_drm_unload(struct drm_device *dev) 237 { 238 exynos_drm_device_subdrv_remove(dev); 239 240 exynos_drm_fbdev_fini(dev); 241 drm_kms_helper_poll_fini(dev); 242 243 drm_vblank_cleanup(dev); 244 component_unbind_all(dev->dev, dev); 245 drm_mode_config_cleanup(dev); 246 drm_release_iommu_mapping(dev); 247 248 kfree(dev->dev_private); 249 dev->dev_private = NULL; 250 251 return 0; 252 } 253 254 static int commit_is_pending(struct exynos_drm_private *priv, u32 crtcs) 255 { 256 bool pending; 257 258 spin_lock(&priv->lock); 259 pending = priv->pending & crtcs; 260 spin_unlock(&priv->lock); 261 262 return pending; 263 } 264 265 int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, 266 bool nonblock) 267 { 268 struct exynos_drm_private *priv = dev->dev_private; 269 struct exynos_atomic_commit *commit; 270 int i, ret; 271 272 commit = kzalloc(sizeof(*commit), GFP_KERNEL); 273 if (!commit) 274 return -ENOMEM; 275 276 ret = drm_atomic_helper_prepare_planes(dev, state); 277 if (ret) { 278 kfree(commit); 279 return ret; 280 } 281 282 /* This is the point of no return */ 283 284 INIT_WORK(&commit->work, exynos_drm_atomic_work); 285 commit->dev = dev; 286 commit->state = state; 287 288 /* Wait until all affected CRTCs have completed previous commits and 289 * mark them as pending. 290 */ 291 for (i = 0; i < dev->mode_config.num_crtc; ++i) { 292 if (state->crtcs[i]) 293 commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]); 294 } 295 296 wait_event(priv->wait, !commit_is_pending(priv, commit->crtcs)); 297 298 spin_lock(&priv->lock); 299 priv->pending |= commit->crtcs; 300 spin_unlock(&priv->lock); 301 302 drm_atomic_helper_swap_state(dev, state); 303 304 if (nonblock) 305 schedule_work(&commit->work); 306 else 307 exynos_atomic_commit_complete(commit); 308 309 return 0; 310 } 311 312 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file) 313 { 314 struct drm_exynos_file_private *file_priv; 315 int ret; 316 317 file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL); 318 if (!file_priv) 319 return -ENOMEM; 320 321 file->driver_priv = file_priv; 322 323 ret = exynos_drm_subdrv_open(dev, file); 324 if (ret) 325 goto err_file_priv_free; 326 327 return ret; 328 329 err_file_priv_free: 330 kfree(file_priv); 331 file->driver_priv = NULL; 332 return ret; 333 } 334 335 static void exynos_drm_preclose(struct drm_device *dev, 336 struct drm_file *file) 337 { 338 struct drm_crtc *crtc; 339 340 exynos_drm_subdrv_close(dev, file); 341 342 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) 343 exynos_drm_crtc_cancel_page_flip(crtc, file); 344 } 345 346 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file) 347 { 348 kfree(file->driver_priv); 349 file->driver_priv = NULL; 350 } 351 352 static void exynos_drm_lastclose(struct drm_device *dev) 353 { 354 exynos_drm_fbdev_restore_mode(dev); 355 } 356 357 static const struct vm_operations_struct exynos_drm_gem_vm_ops = { 358 .fault = exynos_drm_gem_fault, 359 .open = drm_gem_vm_open, 360 .close = drm_gem_vm_close, 361 }; 362 363 static const struct drm_ioctl_desc exynos_ioctls[] = { 364 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl, 365 DRM_AUTH | DRM_RENDER_ALLOW), 366 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl, 367 DRM_AUTH | DRM_RENDER_ALLOW), 368 DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl, 369 DRM_RENDER_ALLOW), 370 DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl, 371 DRM_AUTH), 372 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl, 373 DRM_AUTH | DRM_RENDER_ALLOW), 374 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl, 375 DRM_AUTH | DRM_RENDER_ALLOW), 376 DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl, 377 DRM_AUTH | DRM_RENDER_ALLOW), 378 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property, 379 DRM_AUTH | DRM_RENDER_ALLOW), 380 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property, 381 DRM_AUTH | DRM_RENDER_ALLOW), 382 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf, 383 DRM_AUTH | DRM_RENDER_ALLOW), 384 DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl, 385 DRM_AUTH | DRM_RENDER_ALLOW), 386 }; 387 388 static const struct file_operations exynos_drm_driver_fops = { 389 .owner = THIS_MODULE, 390 .open = drm_open, 391 .mmap = exynos_drm_gem_mmap, 392 .poll = drm_poll, 393 .read = drm_read, 394 .unlocked_ioctl = drm_ioctl, 395 #ifdef CONFIG_COMPAT 396 .compat_ioctl = drm_compat_ioctl, 397 #endif 398 .release = drm_release, 399 }; 400 401 static struct drm_driver exynos_drm_driver = { 402 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME 403 | DRIVER_ATOMIC | DRIVER_RENDER, 404 .load = exynos_drm_load, 405 .unload = exynos_drm_unload, 406 .open = exynos_drm_open, 407 .preclose = exynos_drm_preclose, 408 .lastclose = exynos_drm_lastclose, 409 .postclose = exynos_drm_postclose, 410 .set_busid = drm_platform_set_busid, 411 .get_vblank_counter = drm_vblank_no_hw_counter, 412 .enable_vblank = exynos_drm_crtc_enable_vblank, 413 .disable_vblank = exynos_drm_crtc_disable_vblank, 414 .gem_free_object_unlocked = exynos_drm_gem_free_object, 415 .gem_vm_ops = &exynos_drm_gem_vm_ops, 416 .dumb_create = exynos_drm_gem_dumb_create, 417 .dumb_map_offset = exynos_drm_gem_dumb_map_offset, 418 .dumb_destroy = drm_gem_dumb_destroy, 419 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 420 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 421 .gem_prime_export = drm_gem_prime_export, 422 .gem_prime_import = drm_gem_prime_import, 423 .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table, 424 .gem_prime_import_sg_table = exynos_drm_gem_prime_import_sg_table, 425 .gem_prime_vmap = exynos_drm_gem_prime_vmap, 426 .gem_prime_vunmap = exynos_drm_gem_prime_vunmap, 427 .gem_prime_mmap = exynos_drm_gem_prime_mmap, 428 .ioctls = exynos_ioctls, 429 .num_ioctls = ARRAY_SIZE(exynos_ioctls), 430 .fops = &exynos_drm_driver_fops, 431 .name = DRIVER_NAME, 432 .desc = DRIVER_DESC, 433 .date = DRIVER_DATE, 434 .major = DRIVER_MAJOR, 435 .minor = DRIVER_MINOR, 436 }; 437 438 #ifdef CONFIG_PM_SLEEP 439 static int exynos_drm_suspend(struct device *dev) 440 { 441 struct drm_device *drm_dev = dev_get_drvdata(dev); 442 struct drm_connector *connector; 443 444 if (pm_runtime_suspended(dev) || !drm_dev) 445 return 0; 446 447 drm_modeset_lock_all(drm_dev); 448 drm_for_each_connector(connector, drm_dev) { 449 int old_dpms = connector->dpms; 450 451 if (connector->funcs->dpms) 452 connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF); 453 454 /* Set the old mode back to the connector for resume */ 455 connector->dpms = old_dpms; 456 } 457 drm_modeset_unlock_all(drm_dev); 458 459 return 0; 460 } 461 462 static int exynos_drm_resume(struct device *dev) 463 { 464 struct drm_device *drm_dev = dev_get_drvdata(dev); 465 struct drm_connector *connector; 466 467 if (pm_runtime_suspended(dev) || !drm_dev) 468 return 0; 469 470 drm_modeset_lock_all(drm_dev); 471 drm_for_each_connector(connector, drm_dev) { 472 if (connector->funcs->dpms) { 473 int dpms = connector->dpms; 474 475 connector->dpms = DRM_MODE_DPMS_OFF; 476 connector->funcs->dpms(connector, dpms); 477 } 478 } 479 drm_modeset_unlock_all(drm_dev); 480 481 return 0; 482 } 483 #endif 484 485 static const struct dev_pm_ops exynos_drm_pm_ops = { 486 SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume) 487 }; 488 489 /* forward declaration */ 490 static struct platform_driver exynos_drm_platform_driver; 491 492 struct exynos_drm_driver_info { 493 struct platform_driver *driver; 494 unsigned int flags; 495 }; 496 497 #define DRM_COMPONENT_DRIVER BIT(0) /* supports component framework */ 498 #define DRM_VIRTUAL_DEVICE BIT(1) /* create virtual platform device */ 499 #define DRM_DMA_DEVICE BIT(2) /* can be used for dma allocations */ 500 501 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL) 502 503 /* 504 * Connector drivers should not be placed before associated crtc drivers, 505 * because connector requires pipe number of its crtc during initialization. 506 */ 507 static struct exynos_drm_driver_info exynos_drm_drivers[] = { 508 { 509 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD), 510 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 511 }, { 512 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON), 513 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 514 }, { 515 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON), 516 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 517 }, { 518 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER), 519 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE 520 }, { 521 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC), 522 DRM_COMPONENT_DRIVER 523 }, { 524 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP), 525 DRM_COMPONENT_DRIVER 526 }, { 527 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI), 528 DRM_COMPONENT_DRIVER 529 }, { 530 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI), 531 DRM_COMPONENT_DRIVER 532 }, { 533 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI), 534 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE 535 }, { 536 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D), 537 }, { 538 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC), 539 }, { 540 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR), 541 }, { 542 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC), 543 }, { 544 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP), 545 DRM_VIRTUAL_DEVICE 546 }, { 547 &exynos_drm_platform_driver, 548 DRM_VIRTUAL_DEVICE 549 } 550 }; 551 552 static int compare_dev(struct device *dev, void *data) 553 { 554 return dev == (struct device *)data; 555 } 556 557 static struct component_match *exynos_drm_match_add(struct device *dev) 558 { 559 struct component_match *match = NULL; 560 int i; 561 562 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 563 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 564 struct device *p = NULL, *d; 565 566 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER)) 567 continue; 568 569 while ((d = bus_find_device(&platform_bus_type, p, 570 &info->driver->driver, 571 (void *)platform_bus_type.match))) { 572 put_device(p); 573 component_match_add(dev, &match, compare_dev, d); 574 p = d; 575 } 576 put_device(p); 577 } 578 579 return match ?: ERR_PTR(-ENODEV); 580 } 581 582 static int exynos_drm_bind(struct device *dev) 583 { 584 return drm_platform_init(&exynos_drm_driver, to_platform_device(dev)); 585 } 586 587 static void exynos_drm_unbind(struct device *dev) 588 { 589 drm_put_dev(dev_get_drvdata(dev)); 590 } 591 592 static const struct component_master_ops exynos_drm_ops = { 593 .bind = exynos_drm_bind, 594 .unbind = exynos_drm_unbind, 595 }; 596 597 static int exynos_drm_platform_probe(struct platform_device *pdev) 598 { 599 struct component_match *match; 600 601 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 602 exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls); 603 604 match = exynos_drm_match_add(&pdev->dev); 605 if (IS_ERR(match)) 606 return PTR_ERR(match); 607 608 return component_master_add_with_match(&pdev->dev, &exynos_drm_ops, 609 match); 610 } 611 612 static int exynos_drm_platform_remove(struct platform_device *pdev) 613 { 614 component_master_del(&pdev->dev, &exynos_drm_ops); 615 return 0; 616 } 617 618 static struct platform_driver exynos_drm_platform_driver = { 619 .probe = exynos_drm_platform_probe, 620 .remove = exynos_drm_platform_remove, 621 .driver = { 622 .name = "exynos-drm", 623 .pm = &exynos_drm_pm_ops, 624 }, 625 }; 626 627 static struct device *exynos_drm_get_dma_device(void) 628 { 629 int i; 630 631 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 632 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 633 struct device *dev; 634 635 if (!info->driver || !(info->flags & DRM_DMA_DEVICE)) 636 continue; 637 638 while ((dev = bus_find_device(&platform_bus_type, NULL, 639 &info->driver->driver, 640 (void *)platform_bus_type.match))) { 641 put_device(dev); 642 return dev; 643 } 644 } 645 return NULL; 646 } 647 648 static void exynos_drm_unregister_devices(void) 649 { 650 int i; 651 652 for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) { 653 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 654 struct device *dev; 655 656 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) 657 continue; 658 659 while ((dev = bus_find_device(&platform_bus_type, NULL, 660 &info->driver->driver, 661 (void *)platform_bus_type.match))) { 662 put_device(dev); 663 platform_device_unregister(to_platform_device(dev)); 664 } 665 } 666 } 667 668 static int exynos_drm_register_devices(void) 669 { 670 struct platform_device *pdev; 671 int i; 672 673 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 674 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 675 676 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) 677 continue; 678 679 pdev = platform_device_register_simple( 680 info->driver->driver.name, -1, NULL, 0); 681 if (IS_ERR(pdev)) 682 goto fail; 683 } 684 685 return 0; 686 fail: 687 exynos_drm_unregister_devices(); 688 return PTR_ERR(pdev); 689 } 690 691 static void exynos_drm_unregister_drivers(void) 692 { 693 int i; 694 695 for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) { 696 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 697 698 if (!info->driver) 699 continue; 700 701 platform_driver_unregister(info->driver); 702 } 703 } 704 705 static int exynos_drm_register_drivers(void) 706 { 707 int i, ret; 708 709 for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) { 710 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i]; 711 712 if (!info->driver) 713 continue; 714 715 ret = platform_driver_register(info->driver); 716 if (ret) 717 goto fail; 718 } 719 return 0; 720 fail: 721 exynos_drm_unregister_drivers(); 722 return ret; 723 } 724 725 static int exynos_drm_init(void) 726 { 727 int ret; 728 729 ret = exynos_drm_register_devices(); 730 if (ret) 731 return ret; 732 733 ret = exynos_drm_register_drivers(); 734 if (ret) 735 goto err_unregister_pdevs; 736 737 return 0; 738 739 err_unregister_pdevs: 740 exynos_drm_unregister_devices(); 741 742 return ret; 743 } 744 745 static void exynos_drm_exit(void) 746 { 747 exynos_drm_unregister_drivers(); 748 exynos_drm_unregister_devices(); 749 } 750 751 module_init(exynos_drm_init); 752 module_exit(exynos_drm_exit); 753 754 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>"); 755 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 756 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>"); 757 MODULE_DESCRIPTION("Samsung SoC DRM Driver"); 758 MODULE_LICENSE("GPL"); 759