kernel/drivers/media/platform/exynos4-is/media-dev.c

   1 /*
   2  * S5P/EXYNOS4 SoC series camera host interface media device driver
   3  *
   4  * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
   5  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 2 of the License,
  10  * or (at your option) any later version.
  11  */
  12
  13 #include <linux/bug.h>
  14 #include <linux/clk.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/device.h>
  17 #include <linux/errno.h>
  18 #include <linux/i2c.h>
  19 #include <linux/kernel.h>
  20 #include <linux/list.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_graph.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <media/v4l2-async.h>
  31 #include <media/v4l2-ctrls.h>
  32 #include <media/v4l2-of.h>
  33 #include <media/media-device.h>
  34 #include <media/exynos-fimc.h>
  35
  36 #include "media-dev.h"
  37 #include "fimc-core.h"
  38 #include "fimc-is.h"
  39 #include "fimc-lite.h"
  40 #include "mipi-csis.h"
  41
  42 /* Set up image sensor subdev -> FIMC capture node notifications. */
  43 static void __setup_sensor_notification(struct fimc_md *fmd,
  44                                         struct v4l2_subdev *sensor,
  45                                         struct v4l2_subdev *fimc_sd)
  46 {
  47         struct fimc_source_info *src_inf;
  48         struct fimc_sensor_info *md_si;
  49         unsigned long flags;
  50
  51         src_inf = v4l2_get_subdev_hostdata(sensor);
  52         if (!src_inf || WARN_ON(fmd == NULL))
  53                 return;
  54
  55         md_si = source_to_sensor_info(src_inf);
  56         spin_lock_irqsave(&fmd->slock, flags);
  57         md_si->host = v4l2_get_subdevdata(fimc_sd);
  58         spin_unlock_irqrestore(&fmd->slock, flags);
  59 }
  60
  61 /**
  62  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  63  * @me: media entity terminating the pipeline
  64  *
  65  * Caller holds the graph mutex.
  66  */
  67 static void fimc_pipeline_prepare(struct fimc_pipeline *p,
  68                                         struct media_entity *me)
  69 {
  70         struct fimc_md *fmd = entity_to_fimc_mdev(me);
  71         struct v4l2_subdev *sd;
  72         struct v4l2_subdev *sensor = NULL;
  73         int i;
  74
  75         for (i = 0; i < IDX_MAX; i++)
  76                 p->subdevs[i] = NULL;
  77
  78         while (1) {
  79                 struct media_pad *pad = NULL;
  80
  81                 /* Find remote source pad */
  82                 for (i = 0; i < me->num_pads; i++) {
  83                         struct media_pad *spad = &me->pads[i];
  84                         if (!(spad->flags & MEDIA_PAD_FL_SINK))
  85                                 continue;
  86                         pad = media_entity_remote_pad(spad);
  87                         if (pad)
  88                                 break;
  89                 }
  90
  91                 if (pad == NULL ||
  92                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
  93                         break;
  94                 sd = media_entity_to_v4l2_subdev(pad->entity);
  95
  96                 switch (sd->grp_id) {
  97                 case GRP_ID_SENSOR:
  98                         sensor = sd;
  99                         /* fall through */
 100                 case GRP_ID_FIMC_IS_SENSOR:
 101                         p->subdevs[IDX_SENSOR] = sd;
 102                         break;
 103                 case GRP_ID_CSIS:
 104                         p->subdevs[IDX_CSIS] = sd;
 105                         break;
 106                 case GRP_ID_FLITE:
 107                         p->subdevs[IDX_FLITE] = sd;
 108                         break;
 109                 case GRP_ID_FIMC:
 110                         p->subdevs[IDX_FIMC] = sd;
 111                         break;
 112                 case GRP_ID_FIMC_IS:
 113                         p->subdevs[IDX_IS_ISP] = sd;
 114                         break;
 115                 default:
 116                         break;
 117                 }
 118                 me = &sd->entity;
 119                 if (me->num_pads == 1)
 120                         break;
 121         }
 122
 123         if (sensor && p->subdevs[IDX_FIMC])
 124                 __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
 125 }
 126
 127 /**
 128  * __subdev_set_power - change power state of a single subdev
 129  * @sd: subdevice to change power state for
 130  * @on: 1 to enable power or 0 to disable
 131  *
 132  * Return result of s_power subdev operation or -ENXIO if sd argument
 133  * is NULL. Return 0 if the subdevice does not implement s_power.
 134  */
 135 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
 136 {
 137         int *use_count;
 138         int ret;
 139
 140         if (sd == NULL)
 141                 return -ENXIO;
 142
 143         use_count = &sd->entity.use_count;
 144         if (on && (*use_count)++ > 0)
 145                 return 0;
 146         else if (!on && (*use_count == 0 || --(*use_count) > 0))
 147                 return 0;
 148         ret = v4l2_subdev_call(sd, core, s_power, on);
 149
 150         return ret != -ENOIOCTLCMD ? ret : 0;
 151 }
 152
 153 /**
 154  * fimc_pipeline_s_power - change power state of all pipeline subdevs
 155  * @fimc: fimc device terminating the pipeline
 156  * @state: true to power on, false to power off
 157  *
 158  * Needs to be called with the graph mutex held.
 159  */
 160 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
 161 {
 162         static const u8 seq[2][IDX_MAX - 1] = {
 163                 { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
 164                 { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
 165         };
 166         int i, ret = 0;
 167
 168         if (p->subdevs[IDX_SENSOR] == NULL)
 169                 return -ENXIO;
 170
 171         for (i = 0; i < IDX_MAX - 1; i++) {
 172                 unsigned int idx = seq[on][i];
 173
 174                 ret = __subdev_set_power(p->subdevs[idx], on);
 175
 176
 177                 if (ret < 0 && ret != -ENXIO)
 178                         goto error;
 179         }
 180         return 0;
 181 error:
 182         for (; i >= 0; i--) {
 183                 unsigned int idx = seq[on][i];
 184                 __subdev_set_power(p->subdevs[idx], !on);
 185         }
 186         return ret;
 187 }
 188
 189 /**
 190  * __fimc_pipeline_open - update the pipeline information, enable power
 191  *                        of all pipeline subdevs and the sensor clock
 192  * @me: media entity to start graph walk with
 193  * @prepare: true to walk the current pipeline and acquire all subdevs
 194  *
 195  * Called with the graph mutex held.
 196  */
 197 static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
 198                                 struct media_entity *me, bool prepare)
 199 {
 200         struct fimc_md *fmd = entity_to_fimc_mdev(me);
 201         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 202         struct v4l2_subdev *sd;
 203         int ret;
 204
 205         if (WARN_ON(p == NULL || me == NULL))
 206                 return -EINVAL;
 207
 208         if (prepare)
 209                 fimc_pipeline_prepare(p, me);
 210
 211         sd = p->subdevs[IDX_SENSOR];
 212         if (sd == NULL)
 213                 return -EINVAL;
 214
 215         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 216         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
 217                 ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
 218                 if (ret < 0)
 219                         return ret;
 220         }
 221
 222         ret = fimc_pipeline_s_power(p, 1);
 223         if (!ret)
 224                 return 0;
 225
 226         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 227                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 228
 229         return ret;
 230 }
 231
 232 /**
 233  * __fimc_pipeline_close - disable the sensor clock and pipeline power
 234  * @fimc: fimc device terminating the pipeline
 235  *
 236  * Disable power of all subdevs and turn the external sensor clock off.
 237  */
 238 static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
 239 {
 240         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 241         struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
 242         struct fimc_md *fmd;
 243         int ret;
 244
 245         if (sd == NULL) {
 246                 pr_warn("%s(): No sensor subdev\n", __func__);
 247                 return 0;
 248         }
 249
 250         ret = fimc_pipeline_s_power(p, 0);
 251
 252         fmd = entity_to_fimc_mdev(&sd->entity);
 253
 254         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 255         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 256                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 257
 258         return ret == -ENXIO ? 0 : ret;
 259 }
 260
 261 /**
 262  * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 263  * @pipeline: video pipeline structure
 264  * @on: passed as the s_stream() callback argument
 265  */
 266 static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 267 {
 268         static const u8 seq[2][IDX_MAX] = {
 269                 { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
 270                 { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 271         };
 272         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 273         int i, ret = 0;
 274
 275         if (p->subdevs[IDX_SENSOR] == NULL)
 276                 return -ENODEV;
 277
 278         for (i = 0; i < IDX_MAX; i++) {
 279                 unsigned int idx = seq[on][i];
 280
 281                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
 282
 283                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 284                         goto error;
 285         }
 286         return 0;
 287 error:
 288         for (; i >= 0; i--) {
 289                 unsigned int idx = seq[on][i];
 290                 v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
 291         }
 292         return ret;
 293 }
 294
 295 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
 296 static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
 297         .open           = __fimc_pipeline_open,
 298         .close          = __fimc_pipeline_close,
 299         .set_stream     = __fimc_pipeline_s_stream,
 300 };
 301
 302 static struct exynos_media_pipeline *fimc_md_pipeline_create(
 303                                                 struct fimc_md *fmd)
 304 {
 305         struct fimc_pipeline *p;
 306
 307         p = kzalloc(sizeof(*p), GFP_KERNEL);
 308         if (!p)
 309                 return NULL;
 310
 311         list_add_tail(&p->list, &fmd->pipelines);
 312
 313         p->ep.ops = &fimc_pipeline_ops;
 314         return &p->ep;
 315 }
 316
 317 static void fimc_md_pipelines_free(struct fimc_md *fmd)
 318 {
 319         while (!list_empty(&fmd->pipelines)) {
 320                 struct fimc_pipeline *p;
 321
 322                 p = list_entry(fmd->pipelines.next, typeof(*p), list);
 323                 list_del(&p->list);
 324                 kfree(p);
 325         }
 326 }
 327
 328 /* Parse port node and register as a sub-device any sensor specified there. */
 329 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 330                                    struct device_node *port,
 331                                    unsigned int index)
 332 {
 333         struct fimc_source_info *pd = &fmd->sensor[index].pdata;
 334         struct device_node *rem, *ep, *np;
 335         struct v4l2_of_endpoint endpoint;
 336
 337         /* Assume here a port node can have only one endpoint node. */
 338         ep = of_get_next_child(port, NULL);
 339         if (!ep)
 340                 return 0;
 341
 342         v4l2_of_parse_endpoint(ep, &endpoint);
 343         if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
 344                 return -EINVAL;
 345
 346         pd->mux_id = (endpoint.base.port - 1) & 0x1;
 347
 348         rem = of_graph_get_remote_port_parent(ep);
 349         of_node_put(ep);
 350         if (rem == NULL) {
 351                 v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
 352                                                         ep->full_name);
 353                 return 0;
 354         }
 355
 356         if (fimc_input_is_parallel(endpoint.base.port)) {
 357                 if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
 358                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
 359                 else
 360                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
 361                 pd->flags = endpoint.bus.parallel.flags;
 362         } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
 363                 /*
 364                  * MIPI CSI-2: only input mux selection and
 365                  * the sensor's clock frequency is needed.
 366                  */
 367                 pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
 368         } else {
 369                 v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
 370                          endpoint.base.port, rem->full_name);
 371         }
 372         /*
 373          * For FIMC-IS handled sensors, that are placed under i2c-isp device
 374          * node, FIMC is connected to the FIMC-IS through its ISP Writeback
 375          * input. Sensors are attached to the FIMC-LITE hostdata interface
 376          * directly or through MIPI-CSIS, depending on the external media bus
 377          * used. This needs to be handled in a more reliable way, not by just
 378          * checking parent's node name.
 379          */
 380         np = of_get_parent(rem);
 381
 382         if (np && !of_node_cmp(np->name, "i2c-isp"))
 383                 pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
 384         else
 385                 pd->fimc_bus_type = pd->sensor_bus_type;
 386
 387         if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor)))
 388                 return -EINVAL;
 389
 390         fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
 391         fmd->sensor[index].asd.match.of.node = rem;
 392         fmd->async_subdevs[index] = &fmd->sensor[index].asd;
 393
 394         fmd->num_sensors++;
 395
 396         of_node_put(rem);
 397         return 0;
 398 }
 399
 400 /* Register all SoC external sub-devices */
 401 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 402 {
 403         struct device_node *parent = fmd->pdev->dev.of_node;
 404         struct device_node *node, *ports;
 405         int index = 0;
 406         int ret;
 407
 408         /*
 409          * Runtime resume one of the FIMC entities to make sure
 410          * the sclk_cam clocks are not globally disabled.
 411          */
 412         if (!fmd->pmf)
 413                 return -ENXIO;
 414
 415         ret = pm_runtime_get_sync(fmd->pmf);
 416         if (ret < 0)
 417                 return ret;
 418
 419         fmd->num_sensors = 0;
 420
 421         /* Attach sensors linked to MIPI CSI-2 receivers */
 422         for_each_available_child_of_node(parent, node) {
 423                 struct device_node *port;
 424
 425                 if (of_node_cmp(node->name, "csis"))
 426                         continue;
 427                 /* The csis node can have only port subnode. */
 428                 port = of_get_next_child(node, NULL);
 429                 if (!port)
 430                         continue;
 431
 432                 ret = fimc_md_parse_port_node(fmd, port, index);
 433                 if (ret < 0)
 434                         goto rpm_put;
 435                 index++;
 436         }
 437
 438         /* Attach sensors listed in the parallel-ports node */
 439         ports = of_get_child_by_name(parent, "parallel-ports");
 440         if (!ports)
 441                 goto rpm_put;
 442
 443         for_each_child_of_node(ports, node) {
 444                 ret = fimc_md_parse_port_node(fmd, node, index);
 445                 if (ret < 0)
 446                         break;
 447                 index++;
 448         }
 449 rpm_put:
 450         pm_runtime_put(fmd->pmf);
 451         return ret;
 452 }
 453
 454 static int __of_get_csis_id(struct device_node *np)
 455 {
 456         u32 reg = 0;
 457
 458         np = of_get_child_by_name(np, "port");
 459         if (!np)
 460                 return -EINVAL;
 461         of_property_read_u32(np, "reg", &reg);
 462         return reg - FIMC_INPUT_MIPI_CSI2_0;
 463 }
 464
 465 /*
 466  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 467  */
 468 static int register_fimc_lite_entity(struct fimc_md *fmd,
 469                                      struct fimc_lite *fimc_lite)
 470 {
 471         struct v4l2_subdev *sd;
 472         struct exynos_media_pipeline *ep;
 473         int ret;
 474
 475         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 476                     fmd->fimc_lite[fimc_lite->index]))
 477                 return -EBUSY;
 478
 479         sd = &fimc_lite->subdev;
 480         sd->grp_id = GRP_ID_FLITE;
 481
 482         ep = fimc_md_pipeline_create(fmd);
 483         if (!ep)
 484                 return -ENOMEM;
 485
 486         v4l2_set_subdev_hostdata(sd, ep);
 487
 488         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 489         if (!ret)
 490                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 491         else
 492                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 493                          fimc_lite->index);
 494         return ret;
 495 }
 496
 497 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 498 {
 499         struct v4l2_subdev *sd;
 500         struct exynos_media_pipeline *ep;
 501         int ret;
 502
 503         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 504                 return -EBUSY;
 505
 506         sd = &fimc->vid_cap.subdev;
 507         sd->grp_id = GRP_ID_FIMC;
 508
 509         ep = fimc_md_pipeline_create(fmd);
 510         if (!ep)
 511                 return -ENOMEM;
 512
 513         v4l2_set_subdev_hostdata(sd, ep);
 514
 515         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 516         if (!ret) {
 517                 if (!fmd->pmf && fimc->pdev)
 518                         fmd->pmf = &fimc->pdev->dev;
 519                 fmd->fimc[fimc->id] = fimc;
 520                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 521         } else {
 522                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 523                          fimc->id, ret);
 524         }
 525         return ret;
 526 }
 527
 528 static int register_csis_entity(struct fimc_md *fmd,
 529                                 struct platform_device *pdev,
 530                                 struct v4l2_subdev *sd)
 531 {
 532         struct device_node *node = pdev->dev.of_node;
 533         int id, ret;
 534
 535         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 536
 537         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 538                 return -ENOENT;
 539
 540         if (WARN_ON(fmd->csis[id].sd))
 541                 return -EBUSY;
 542
 543         sd->grp_id = GRP_ID_CSIS;
 544         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 545         if (!ret)
 546                 fmd->csis[id].sd = sd;
 547         else
 548                 v4l2_err(&fmd->v4l2_dev,
 549                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 550         return ret;
 551 }
 552
 553 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 554 {
 555         struct v4l2_subdev *sd = &is->isp.subdev;
 556         struct exynos_media_pipeline *ep;
 557         int ret;
 558
 559         /* Allocate pipeline object for the ISP capture video node. */
 560         ep = fimc_md_pipeline_create(fmd);
 561         if (!ep)
 562                 return -ENOMEM;
 563
 564         v4l2_set_subdev_hostdata(sd, ep);
 565
 566         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 567         if (ret) {
 568                 v4l2_err(&fmd->v4l2_dev,
 569                          "Failed to register FIMC-ISP (%d)\n", ret);
 570                 return ret;
 571         }
 572
 573         fmd->fimc_is = is;
 574         return 0;
 575 }
 576
 577 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 578                                             struct platform_device *pdev,
 579                                             int plat_entity)
 580 {
 581         struct device *dev = &pdev->dev;
 582         int ret = -EPROBE_DEFER;
 583         void *drvdata;
 584
 585         /* Lock to ensure dev->driver won't change. */
 586         device_lock(dev);
 587
 588         if (!dev->driver || !try_module_get(dev->driver->owner))
 589                 goto dev_unlock;
 590
 591         drvdata = dev_get_drvdata(dev);
 592         /* Some subdev didn't probe successfully id drvdata is NULL */
 593         if (drvdata) {
 594                 switch (plat_entity) {
 595                 case IDX_FIMC:
 596                         ret = register_fimc_entity(fmd, drvdata);
 597                         break;
 598                 case IDX_FLITE:
 599                         ret = register_fimc_lite_entity(fmd, drvdata);
 600                         break;
 601                 case IDX_CSIS:
 602                         ret = register_csis_entity(fmd, pdev, drvdata);
 603                         break;
 604                 case IDX_IS_ISP:
 605                         ret = register_fimc_is_entity(fmd, drvdata);
 606                         break;
 607                 default:
 608                         ret = -ENODEV;
 609                 }
 610         }
 611
 612         module_put(dev->driver->owner);
 613 dev_unlock:
 614         device_unlock(dev);
 615         if (ret == -EPROBE_DEFER)
 616                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 617                         dev_name(dev));
 618         else if (ret < 0)
 619                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 620                         dev_name(dev), ret);
 621         return ret;
 622 }
 623
 624 /* Register FIMC, FIMC-LITE and CSIS media entities */
 625 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 626                                               struct device_node *parent)
 627 {
 628         struct device_node *node;
 629         int ret = 0;
 630
 631         for_each_available_child_of_node(parent, node) {
 632                 struct platform_device *pdev;
 633                 int plat_entity = -1;
 634
 635                 pdev = of_find_device_by_node(node);
 636                 if (!pdev)
 637                         continue;
 638
 639                 /* If driver of any entity isn't ready try all again later. */
 640                 if (!strcmp(node->name, CSIS_OF_NODE_NAME))
 641                         plat_entity = IDX_CSIS;
 642                 else if (!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
 643                         plat_entity = IDX_IS_ISP;
 644                 else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
 645                         plat_entity = IDX_FLITE;
 646                 else if (!strcmp(node->name, FIMC_OF_NODE_NAME) &&
 647                          !of_property_read_bool(node, "samsung,lcd-wb"))
 648                         plat_entity = IDX_FIMC;
 649
 650                 if (plat_entity >= 0)
 651                         ret = fimc_md_register_platform_entity(fmd, pdev,
 652                                                         plat_entity);
 653                 put_device(&pdev->dev);
 654                 if (ret < 0)
 655                         break;
 656         }
 657
 658         return ret;
 659 }
 660
 661 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 662 {
 663         int i;
 664
 665         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 666                 struct fimc_dev *dev = fmd->fimc[i];
 667                 if (dev == NULL)
 668                         continue;
 669                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 670                 dev->vid_cap.ve.pipe = NULL;
 671                 fmd->fimc[i] = NULL;
 672         }
 673         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 674                 struct fimc_lite *dev = fmd->fimc_lite[i];
 675                 if (dev == NULL)
 676                         continue;
 677                 v4l2_device_unregister_subdev(&dev->subdev);
 678                 dev->ve.pipe = NULL;
 679                 fmd->fimc_lite[i] = NULL;
 680         }
 681         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 682                 if (fmd->csis[i].sd == NULL)
 683                         continue;
 684                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 685                 fmd->csis[i].sd = NULL;
 686         }
 687
 688         if (fmd->fimc_is)
 689                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 690
 691         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 692 }
 693
 694 /**
 695  * __fimc_md_create_fimc_links - create links to all FIMC entities
 696  * @fmd: fimc media device
 697  * @source: the source entity to create links to all fimc entities from
 698  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 699  * @pad: the source entity pad index
 700  * @link_mask: bitmask of the fimc devices for which link should be enabled
 701  */
 702 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 703                                             struct media_entity *source,
 704                                             struct v4l2_subdev *sensor,
 705                                             int pad, int link_mask)
 706 {
 707         struct fimc_source_info *si = NULL;
 708         struct media_entity *sink;
 709         unsigned int flags = 0;
 710         int i, ret = 0;
 711
 712         if (sensor) {
 713                 si = v4l2_get_subdev_hostdata(sensor);
 714                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 715                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 716                         ret = 1;
 717         }
 718
 719         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 720                 if (!fmd->fimc[i])
 721                         continue;
 722                 /*
 723                  * Some FIMC variants are not fitted with camera capture
 724                  * interface. Skip creating a link from sensor for those.
 725                  */
 726                 if (!fmd->fimc[i]->variant->has_cam_if)
 727                         continue;
 728
 729                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 730
 731                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 732                 ret = media_entity_create_link(source, pad, sink,
 733                                               FIMC_SD_PAD_SINK_CAM, flags);
 734                 if (ret)
 735                         return ret;
 736
 737                 /* Notify FIMC capture subdev entity */
 738                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 739                                         &source->pads[pad], flags);
 740                 if (ret)
 741                         break;
 742
 743                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 744                           source->name, flags ? '=' : '-', sink->name);
 745         }
 746
 747         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 748                 if (!fmd->fimc_lite[i])
 749                         continue;
 750
 751                 sink = &fmd->fimc_lite[i]->subdev.entity;
 752                 ret = media_entity_create_link(source, pad, sink,
 753                                                FLITE_SD_PAD_SINK, 0);
 754                 if (ret)
 755                         return ret;
 756
 757                 /* Notify FIMC-LITE subdev entity */
 758                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 759                                         &source->pads[pad], 0);
 760                 if (ret)
 761                         break;
 762
 763                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 764                           source->name, sink->name);
 765         }
 766         return 0;
 767 }
 768
 769 /* Create links from FIMC-LITE source pads to other entities */
 770 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 771 {
 772         struct media_entity *source, *sink;
 773         int i, ret = 0;
 774
 775         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 776                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 777
 778                 if (fimc == NULL)
 779                         continue;
 780
 781                 source = &fimc->subdev.entity;
 782                 sink = &fimc->ve.vdev.entity;
 783                 /* FIMC-LITE's subdev and video node */
 784                 ret = media_entity_create_link(source, FLITE_SD_PAD_SOURCE_DMA,
 785                                                sink, 0, 0);
 786                 if (ret)
 787                         break;
 788                 /* Link from FIMC-LITE to IS-ISP subdev */
 789                 sink = &fmd->fimc_is->isp.subdev.entity;
 790                 ret = media_entity_create_link(source, FLITE_SD_PAD_SOURCE_ISP,
 791                                                sink, 0, 0);
 792                 if (ret)
 793                         break;
 794         }
 795
 796         return ret;
 797 }
 798
 799 /* Create FIMC-IS links */
 800 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 801 {
 802         struct fimc_isp *isp = &fmd->fimc_is->isp;
 803         struct media_entity *source, *sink;
 804         int i, ret;
 805
 806         source = &isp->subdev.entity;
 807
 808         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 809                 if (fmd->fimc[i] == NULL)
 810                         continue;
 811
 812                 /* Link from FIMC-IS-ISP subdev to FIMC */
 813                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 814                 ret = media_entity_create_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 815                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 816                 if (ret)
 817                         return ret;
 818         }
 819
 820         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 821         sink = &isp->video_capture.ve.vdev.entity;
 822
 823         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 824         if (sink->num_pads == 0)
 825                 return 0;
 826
 827         return media_entity_create_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 828                                         sink, 0, 0);
 829 }
 830
 831 /**
 832  * fimc_md_create_links - create default links between registered entities
 833  *
 834  * Parallel interface sensor entities are connected directly to FIMC capture
 835  * entities. The sensors using MIPI CSIS bus are connected through immutable
 836  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 837  * entity has a link to each registered FIMC capture entity. Enabled links
 838  * are created by default between each subsequent registered sensor and
 839  * subsequent FIMC capture entity. The number of default active links is
 840  * determined by the number of available sensors or FIMC entities,
 841  * whichever is less.
 842  */
 843 static int fimc_md_create_links(struct fimc_md *fmd)
 844 {
 845         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 846         struct v4l2_subdev *sensor, *csis;
 847         struct fimc_source_info *pdata;
 848         struct media_entity *source, *sink;
 849         int i, pad, fimc_id = 0, ret = 0;
 850         u32 flags, link_mask = 0;
 851
 852         for (i = 0; i < fmd->num_sensors; i++) {
 853                 if (fmd->sensor[i].subdev == NULL)
 854                         continue;
 855
 856                 sensor = fmd->sensor[i].subdev;
 857                 pdata = v4l2_get_subdev_hostdata(sensor);
 858                 if (!pdata)
 859                         continue;
 860
 861                 source = NULL;
 862
 863                 switch (pdata->sensor_bus_type) {
 864                 case FIMC_BUS_TYPE_MIPI_CSI2:
 865                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 866                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 867                                 return -EINVAL;
 868
 869                         csis = fmd->csis[pdata->mux_id].sd;
 870                         if (WARN(csis == NULL,
 871                                  "MIPI-CSI interface specified "
 872                                  "but s5p-csis module is not loaded!\n"))
 873                                 return -EINVAL;
 874
 875                         pad = sensor->entity.num_pads - 1;
 876                         ret = media_entity_create_link(&sensor->entity, pad,
 877                                               &csis->entity, CSIS_PAD_SINK,
 878                                               MEDIA_LNK_FL_IMMUTABLE |
 879                                               MEDIA_LNK_FL_ENABLED);
 880                         if (ret)
 881                                 return ret;
 882
 883                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 884                                   sensor->entity.name, csis->entity.name);
 885
 886                         source = NULL;
 887                         csi_sensors[pdata->mux_id] = sensor;
 888                         break;
 889
 890                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
 891                         source = &sensor->entity;
 892                         pad = 0;
 893                         break;
 894
 895                 default:
 896                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 897                                  pdata->sensor_bus_type);
 898                         return -EINVAL;
 899                 }
 900                 if (source == NULL)
 901                         continue;
 902
 903                 link_mask = 1 << fimc_id++;
 904                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 905                                                        pad, link_mask);
 906         }
 907
 908         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 909                 if (fmd->csis[i].sd == NULL)
 910                         continue;
 911
 912                 source = &fmd->csis[i].sd->entity;
 913                 pad = CSIS_PAD_SOURCE;
 914                 sensor = csi_sensors[i];
 915
 916                 link_mask = 1 << fimc_id++;
 917                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 918                                                        pad, link_mask);
 919         }
 920
 921         /* Create immutable links between each FIMC's subdev and video node */
 922         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 923         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 924                 if (!fmd->fimc[i])
 925                         continue;
 926
 927                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
 928                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
 929
 930                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
 931                                               sink, 0, flags);
 932                 if (ret)
 933                         break;
 934         }
 935
 936         ret = __fimc_md_create_flite_source_links(fmd);
 937         if (ret < 0)
 938                 return ret;
 939
 940         if (fmd->use_isp)
 941                 ret = __fimc_md_create_fimc_is_links(fmd);
 942
 943         return ret;
 944 }
 945
 946 /*
 947  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
 948  */
 949 static void fimc_md_put_clocks(struct fimc_md *fmd)
 950 {
 951         int i = FIMC_MAX_CAMCLKS;
 952
 953         while (--i >= 0) {
 954                 if (IS_ERR(fmd->camclk[i].clock))
 955                         continue;
 956                 clk_put(fmd->camclk[i].clock);
 957                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
 958         }
 959
 960         /* Writeback (PIXELASYNCMx) clocks */
 961         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
 962                 if (IS_ERR(fmd->wbclk[i]))
 963                         continue;
 964                 clk_put(fmd->wbclk[i]);
 965                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
 966         }
 967 }
 968
 969 static int fimc_md_get_clocks(struct fimc_md *fmd)
 970 {
 971         struct device *dev = &fmd->pdev->dev;
 972         char clk_name[32];
 973         struct clk *clock;
 974         int i, ret = 0;
 975
 976         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
 977                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
 978
 979         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
 980                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
 981                 clock = clk_get(dev, clk_name);
 982
 983                 if (IS_ERR(clock)) {
 984                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
 985                         ret = PTR_ERR(clock);
 986                         break;
 987                 }
 988                 fmd->camclk[i].clock = clock;
 989         }
 990         if (ret)
 991                 fimc_md_put_clocks(fmd);
 992
 993         if (!fmd->use_isp)
 994                 return 0;
 995         /*
 996          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
 997          * leave PIXELASYNCM0 out for the LCD Writeback driver.
 998          */
 999         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1000
1001         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1002                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1003                 clock = clk_get(dev, clk_name);
1004                 if (IS_ERR(clock)) {
1005                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1006                                   clk_name);
1007                         ret = PTR_ERR(clock);
1008                         break;
1009                 }
1010                 fmd->wbclk[i] = clock;
1011         }
1012         if (ret)
1013                 fimc_md_put_clocks(fmd);
1014
1015         return ret;
1016 }
1017
1018 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1019 {
1020         struct exynos_video_entity *ve;
1021         struct fimc_pipeline *p;
1022         struct video_device *vdev;
1023         int ret;
1024
1025         vdev = media_entity_to_video_device(entity);
1026         if (vdev->entity.use_count == 0)
1027                 return 0;
1028
1029         ve = vdev_to_exynos_video_entity(vdev);
1030         p = to_fimc_pipeline(ve->pipe);
1031         /*
1032          * Nothing to do if we are disabling the pipeline, some link
1033          * has been disconnected and p->subdevs array is cleared now.
1034          */
1035         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1036                 return 0;
1037
1038         if (enable)
1039                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1040         else
1041                 ret = __fimc_pipeline_close(ve->pipe);
1042
1043         if (ret == 0 && !enable)
1044                 memset(p->subdevs, 0, sizeof(p->subdevs));
1045
1046         return ret;
1047 }
1048
1049 /* Locking: called with entity->parent->graph_mutex mutex held. */
1050 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable)
1051 {
1052         struct media_entity *entity_err = entity;
1053         struct media_entity_graph graph;
1054         int ret;
1055
1056         /*
1057          * Walk current graph and call the pipeline open/close routine for each
1058          * opened video node that belongs to the graph of entities connected
1059          * through active links. This is needed as we cannot power on/off the
1060          * subdevs in random order.
1061          */
1062         media_entity_graph_walk_start(&graph, entity);
1063
1064         while ((entity = media_entity_graph_walk_next(&graph))) {
1065                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
1066                         continue;
1067
1068                 ret  = __fimc_md_modify_pipeline(entity, enable);
1069
1070                 if (ret < 0)
1071                         goto err;
1072         }
1073
1074         return 0;
1075  err:
1076         media_entity_graph_walk_start(&graph, entity_err);
1077
1078         while ((entity_err = media_entity_graph_walk_next(&graph))) {
1079                 if (media_entity_type(entity_err) != MEDIA_ENT_T_DEVNODE)
1080                         continue;
1081
1082                 __fimc_md_modify_pipeline(entity_err, !enable);
1083
1084                 if (entity_err == entity)
1085                         break;
1086         }
1087
1088         return ret;
1089 }
1090
1091 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1092                                 unsigned int notification)
1093 {
1094         struct media_entity *sink = link->sink->entity;
1095         int ret = 0;
1096
1097         /* Before link disconnection */
1098         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1099                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1100                         ret = __fimc_md_modify_pipelines(sink, false);
1101 #if 0
1102                 else
1103                         /* TODO: Link state change validation */
1104 #endif
1105         /* After link activation */
1106         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
1107                    (link->flags & MEDIA_LNK_FL_ENABLED)) {
1108                 ret = __fimc_md_modify_pipelines(sink, true);
1109         }
1110
1111         return ret ? -EPIPE : 0;
1112 }
1113
1114 static ssize_t fimc_md_sysfs_show(struct device *dev,
1115                                   struct device_attribute *attr, char *buf)
1116 {
1117         struct platform_device *pdev = to_platform_device(dev);
1118         struct fimc_md *fmd = platform_get_drvdata(pdev);
1119
1120         if (fmd->user_subdev_api)
1121                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1122
1123         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1124 }
1125
1126 static ssize_t fimc_md_sysfs_store(struct device *dev,
1127                                    struct device_attribute *attr,
1128                                    const char *buf, size_t count)
1129 {
1130         struct platform_device *pdev = to_platform_device(dev);
1131         struct fimc_md *fmd = platform_get_drvdata(pdev);
1132         bool subdev_api;
1133         int i;
1134
1135         if (!strcmp(buf, "vid-dev\n"))
1136                 subdev_api = false;
1137         else if (!strcmp(buf, "sub-dev\n"))
1138                 subdev_api = true;
1139         else
1140                 return count;
1141
1142         fmd->user_subdev_api = subdev_api;
1143         for (i = 0; i < FIMC_MAX_DEVS; i++)
1144                 if (fmd->fimc[i])
1145                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1146         return count;
1147 }
1148 /*
1149  * This device attribute is to select video pipeline configuration method.
1150  * There are following valid values:
1151  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1152  *  by the host driver.
1153  *  sub-dev - for media controller API, subdevs must be configured in user
1154  *  space before starting streaming.
1155  */
1156 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1157                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1158
1159 static int fimc_md_get_pinctrl(struct fimc_md *fmd)
1160 {
1161         struct device *dev = &fmd->pdev->dev;
1162         struct fimc_pinctrl *pctl = &fmd->pinctl;
1163
1164         pctl->pinctrl = devm_pinctrl_get(dev);
1165         if (IS_ERR(pctl->pinctrl))
1166                 return PTR_ERR(pctl->pinctrl);
1167
1168         pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
1169                                         PINCTRL_STATE_DEFAULT);
1170         if (IS_ERR(pctl->state_default))
1171                 return PTR_ERR(pctl->state_default);
1172
1173         pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
1174                                         PINCTRL_STATE_IDLE);
1175         return 0;
1176 }
1177
1178 static int cam_clk_prepare(struct clk_hw *hw)
1179 {
1180         struct cam_clk *camclk = to_cam_clk(hw);
1181         int ret;
1182
1183         if (camclk->fmd->pmf == NULL)
1184                 return -ENODEV;
1185
1186         ret = pm_runtime_get_sync(camclk->fmd->pmf);
1187         return ret < 0 ? ret : 0;
1188 }
1189
1190 static void cam_clk_unprepare(struct clk_hw *hw)
1191 {
1192         struct cam_clk *camclk = to_cam_clk(hw);
1193
1194         if (camclk->fmd->pmf == NULL)
1195                 return;
1196
1197         pm_runtime_put_sync(camclk->fmd->pmf);
1198 }
1199
1200 static const struct clk_ops cam_clk_ops = {
1201         .prepare = cam_clk_prepare,
1202         .unprepare = cam_clk_unprepare,
1203 };
1204
1205 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1206 {
1207         struct cam_clk_provider *cp = &fmd->clk_provider;
1208         unsigned int i;
1209
1210         if (cp->of_node)
1211                 of_clk_del_provider(cp->of_node);
1212
1213         for (i = 0; i < cp->num_clocks; i++)
1214                 clk_unregister(cp->clks[i]);
1215 }
1216
1217 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1218 {
1219         struct cam_clk_provider *cp = &fmd->clk_provider;
1220         struct device *dev = &fmd->pdev->dev;
1221         int i, ret;
1222
1223         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1224                 struct cam_clk *camclk = &cp->camclk[i];
1225                 struct clk_init_data init;
1226                 const char *p_name;
1227
1228                 ret = of_property_read_string_index(dev->of_node,
1229                                         "clock-output-names", i, &init.name);
1230                 if (ret < 0)
1231                         break;
1232
1233                 p_name = __clk_get_name(fmd->camclk[i].clock);
1234
1235                 /* It's safe since clk_register() will duplicate the string. */
1236                 init.parent_names = &p_name;
1237                 init.num_parents = 1;
1238                 init.ops = &cam_clk_ops;
1239                 init.flags = CLK_SET_RATE_PARENT;
1240                 camclk->hw.init = &init;
1241                 camclk->fmd = fmd;
1242
1243                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1244                 if (IS_ERR(cp->clks[i])) {
1245                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1246                                         init.name, PTR_ERR(cp->clks[i]));
1247                         ret = PTR_ERR(cp->clks[i]);
1248                         goto err;
1249                 }
1250                 cp->num_clocks++;
1251         }
1252
1253         if (cp->num_clocks == 0) {
1254                 dev_warn(dev, "clk provider not registered\n");
1255                 return 0;
1256         }
1257
1258         cp->clk_data.clks = cp->clks;
1259         cp->clk_data.clk_num = cp->num_clocks;
1260         cp->of_node = dev->of_node;
1261         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1262                                   &cp->clk_data);
1263         if (ret == 0)
1264                 return 0;
1265 err:
1266         fimc_md_unregister_clk_provider(fmd);
1267         return ret;
1268 }
1269
1270 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1271                                  struct v4l2_subdev *subdev,
1272                                  struct v4l2_async_subdev *asd)
1273 {
1274         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1275         struct fimc_sensor_info *si = NULL;
1276         int i;
1277
1278         /* Find platform data for this sensor subdev */
1279         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1280                 if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
1281                         si = &fmd->sensor[i];
1282
1283         if (si == NULL)
1284                 return -EINVAL;
1285
1286         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1287
1288         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1289                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1290         else
1291                 subdev->grp_id = GRP_ID_SENSOR;
1292
1293         si->subdev = subdev;
1294
1295         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1296                   subdev->name, fmd->num_sensors);
1297
1298         fmd->num_sensors++;
1299
1300         return 0;
1301 }
1302
1303 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1304 {
1305         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1306         int ret;
1307
1308         mutex_lock(&fmd->media_dev.graph_mutex);
1309
1310         ret = fimc_md_create_links(fmd);
1311         if (ret < 0)
1312                 goto unlock;
1313
1314         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1315 unlock:
1316         mutex_unlock(&fmd->media_dev.graph_mutex);
1317         return ret;
1318 }
1319
1320 static int fimc_md_probe(struct platform_device *pdev)
1321 {
1322         struct device *dev = &pdev->dev;
1323         struct v4l2_device *v4l2_dev;
1324         struct fimc_md *fmd;
1325         int ret;
1326
1327         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1328         if (!fmd)
1329                 return -ENOMEM;
1330
1331         spin_lock_init(&fmd->slock);
1332         INIT_LIST_HEAD(&fmd->pipelines);
1333         fmd->pdev = pdev;
1334
1335         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
1336                 sizeof(fmd->media_dev.model));
1337         fmd->media_dev.link_notify = fimc_md_link_notify;
1338         fmd->media_dev.dev = dev;
1339
1340         v4l2_dev = &fmd->v4l2_dev;
1341         v4l2_dev->mdev = &fmd->media_dev;
1342         v4l2_dev->notify = fimc_sensor_notify;
1343         strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1344
1345         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1346         fmd->user_subdev_api = true;
1347
1348         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1349         if (ret < 0) {
1350                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1351                 return ret;
1352         }
1353
1354         ret = media_device_register(&fmd->media_dev);
1355         if (ret < 0) {
1356                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
1357                 goto err_v4l2_dev;
1358         }
1359
1360         ret = fimc_md_get_clocks(fmd);
1361         if (ret)
1362                 goto err_md;
1363
1364         ret = fimc_md_get_pinctrl(fmd);
1365         if (ret < 0) {
1366                 if (ret != EPROBE_DEFER)
1367                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1368                 goto err_clk;
1369         }
1370
1371         platform_set_drvdata(pdev, fmd);
1372
1373         /* Protect the media graph while we're registering entities */
1374         mutex_lock(&fmd->media_dev.graph_mutex);
1375
1376         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1377         if (ret) {
1378                 mutex_unlock(&fmd->media_dev.graph_mutex);
1379                 goto err_clk;
1380         }
1381
1382         ret = fimc_md_register_sensor_entities(fmd);
1383         if (ret) {
1384                 mutex_unlock(&fmd->media_dev.graph_mutex);
1385                 goto err_m_ent;
1386         }
1387
1388         mutex_unlock(&fmd->media_dev.graph_mutex);
1389
1390         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1391         if (ret)
1392                 goto err_m_ent;
1393         /*
1394          * FIMC platform devices need to be registered before the sclk_cam
1395          * clocks provider, as one of these devices needs to be activated
1396          * to enable the clock.
1397          */
1398         ret = fimc_md_register_clk_provider(fmd);
1399         if (ret < 0) {
1400                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1401                 goto err_attr;
1402         }
1403
1404         if (fmd->num_sensors > 0) {
1405                 fmd->subdev_notifier.subdevs = fmd->async_subdevs;
1406                 fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
1407                 fmd->subdev_notifier.bound = subdev_notifier_bound;
1408                 fmd->subdev_notifier.complete = subdev_notifier_complete;
1409                 fmd->num_sensors = 0;
1410
1411                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1412                                                 &fmd->subdev_notifier);
1413                 if (ret)
1414                         goto err_clk_p;
1415         }
1416
1417         return 0;
1418
1419 err_clk_p:
1420         fimc_md_unregister_clk_provider(fmd);
1421 err_attr:
1422         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1423 err_clk:
1424         fimc_md_put_clocks(fmd);
1425 err_m_ent:
1426         fimc_md_unregister_entities(fmd);
1427 err_md:
1428         media_device_unregister(&fmd->media_dev);
1429 err_v4l2_dev:
1430         v4l2_device_unregister(&fmd->v4l2_dev);
1431         return ret;
1432 }
1433
1434 static int fimc_md_remove(struct platform_device *pdev)
1435 {
1436         struct fimc_md *fmd = platform_get_drvdata(pdev);
1437
1438         if (!fmd)
1439                 return 0;
1440
1441         fimc_md_unregister_clk_provider(fmd);
1442         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1443
1444         v4l2_device_unregister(&fmd->v4l2_dev);
1445         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1446         fimc_md_unregister_entities(fmd);
1447         fimc_md_pipelines_free(fmd);
1448         media_device_unregister(&fmd->media_dev);
1449         fimc_md_put_clocks(fmd);
1450
1451         return 0;
1452 }
1453
1454 static struct platform_device_id fimc_driver_ids[] __always_unused = {
1455         { .name = "s5p-fimc-md" },
1456         { },
1457 };
1458 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1459
1460 static const struct of_device_id fimc_md_of_match[] = {
1461         { .compatible = "samsung,fimc" },
1462         { },
1463 };
1464 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1465
1466 static struct platform_driver fimc_md_driver = {
1467         .probe          = fimc_md_probe,
1468         .remove         = fimc_md_remove,
1469         .driver = {
1470                 .of_match_table = of_match_ptr(fimc_md_of_match),
1471                 .name           = "s5p-fimc-md",
1472         }
1473 };
1474
1475 static int __init fimc_md_init(void)
1476 {
1477         int ret;
1478
1479         request_module("s5p-csis");
1480         ret = fimc_register_driver();
1481         if (ret)
1482                 return ret;
1483
1484         return platform_driver_register(&fimc_md_driver);
1485 }
1486
1487 static void __exit fimc_md_exit(void)
1488 {
1489         platform_driver_unregister(&fimc_md_driver);
1490         fimc_unregister_driver();
1491 }
1492
1493 module_init(fimc_md_init);
1494 module_exit(fimc_md_exit);
1495
1496 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1497 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1498 MODULE_LICENSE("GPL");
1499 MODULE_VERSION("2.0.1");