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/drv-intf/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 || !is_media_entity_v4l2_subdev(pad->entity))
  92                         break;
  93                 sd = media_entity_to_v4l2_subdev(pad->entity);
  94
  95                 switch (sd->grp_id) {
  96                 case GRP_ID_SENSOR:
  97                         sensor = sd;
  98                         /* fall through */
  99                 case GRP_ID_FIMC_IS_SENSOR:
 100                         p->subdevs[IDX_SENSOR] = sd;
 101                         break;
 102                 case GRP_ID_CSIS:
 103                         p->subdevs[IDX_CSIS] = sd;
 104                         break;
 105                 case GRP_ID_FLITE:
 106                         p->subdevs[IDX_FLITE] = sd;
 107                         break;
 108                 case GRP_ID_FIMC:
 109                         p->subdevs[IDX_FIMC] = sd;
 110                         break;
 111                 case GRP_ID_FIMC_IS:
 112                         p->subdevs[IDX_IS_ISP] = sd;
 113                         break;
 114                 default:
 115                         break;
 116                 }
 117                 me = &sd->entity;
 118                 if (me->num_pads == 1)
 119                         break;
 120         }
 121
 122         if (sensor && p->subdevs[IDX_FIMC])
 123                 __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
 124 }
 125
 126 /**
 127  * __subdev_set_power - change power state of a single subdev
 128  * @sd: subdevice to change power state for
 129  * @on: 1 to enable power or 0 to disable
 130  *
 131  * Return result of s_power subdev operation or -ENXIO if sd argument
 132  * is NULL. Return 0 if the subdevice does not implement s_power.
 133  */
 134 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
 135 {
 136         int *use_count;
 137         int ret;
 138
 139         if (sd == NULL)
 140                 return -ENXIO;
 141
 142         use_count = &sd->entity.use_count;
 143         if (on && (*use_count)++ > 0)
 144                 return 0;
 145         else if (!on && (*use_count == 0 || --(*use_count) > 0))
 146                 return 0;
 147         ret = v4l2_subdev_call(sd, core, s_power, on);
 148
 149         return ret != -ENOIOCTLCMD ? ret : 0;
 150 }
 151
 152 /**
 153  * fimc_pipeline_s_power - change power state of all pipeline subdevs
 154  * @fimc: fimc device terminating the pipeline
 155  * @state: true to power on, false to power off
 156  *
 157  * Needs to be called with the graph mutex held.
 158  */
 159 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
 160 {
 161         static const u8 seq[2][IDX_MAX - 1] = {
 162                 { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
 163                 { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
 164         };
 165         int i, ret = 0;
 166
 167         if (p->subdevs[IDX_SENSOR] == NULL)
 168                 return -ENXIO;
 169
 170         for (i = 0; i < IDX_MAX - 1; i++) {
 171                 unsigned int idx = seq[on][i];
 172
 173                 ret = __subdev_set_power(p->subdevs[idx], on);
 174
 175
 176                 if (ret < 0 && ret != -ENXIO)
 177                         goto error;
 178         }
 179         return 0;
 180 error:
 181         for (; i >= 0; i--) {
 182                 unsigned int idx = seq[on][i];
 183                 __subdev_set_power(p->subdevs[idx], !on);
 184         }
 185         return ret;
 186 }
 187
 188 /**
 189  * __fimc_pipeline_enable - enable power of all pipeline subdevs
 190  *                          and the sensor clock
 191  * @ep: video pipeline structure
 192  * @fmd: fimc media device
 193  *
 194  * Called with the graph mutex held.
 195  */
 196 static int __fimc_pipeline_enable(struct exynos_media_pipeline *ep,
 197                                   struct fimc_md *fmd)
 198 {
 199         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 200         int ret;
 201
 202         /* Enable PXLASYNC clock if this pipeline includes FIMC-IS */
 203         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
 204                 ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
 205                 if (ret < 0)
 206                         return ret;
 207         }
 208
 209         ret = fimc_pipeline_s_power(p, 1);
 210         if (!ret)
 211                 return 0;
 212
 213         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 214                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 215
 216         return ret;
 217 }
 218
 219 /**
 220  * __fimc_pipeline_open - update the pipeline information, enable power
 221  *                        of all pipeline subdevs and the sensor clock
 222  * @me: media entity to start graph walk with
 223  * @prepare: true to walk the current pipeline and acquire all subdevs
 224  *
 225  * Called with the graph mutex held.
 226  */
 227 static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
 228                                 struct media_entity *me, bool prepare)
 229 {
 230         struct fimc_md *fmd = entity_to_fimc_mdev(me);
 231         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 232         struct v4l2_subdev *sd;
 233
 234         if (WARN_ON(p == NULL || me == NULL))
 235                 return -EINVAL;
 236
 237         if (prepare)
 238                 fimc_pipeline_prepare(p, me);
 239
 240         sd = p->subdevs[IDX_SENSOR];
 241         if (sd == NULL) {
 242                 pr_warn("%s(): No sensor subdev\n", __func__);
 243                 /*
 244                  * Pipeline open cannot fail so as to make it possible
 245                  * for the user space to configure the pipeline.
 246                  */
 247                 return 0;
 248         }
 249
 250         return __fimc_pipeline_enable(ep, fmd);
 251 }
 252
 253 /**
 254  * __fimc_pipeline_close - disable the sensor clock and pipeline power
 255  * @fimc: fimc device terminating the pipeline
 256  *
 257  * Disable power of all subdevs and turn the external sensor clock off.
 258  */
 259 static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
 260 {
 261         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 262         struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
 263         struct fimc_md *fmd;
 264         int ret;
 265
 266         if (sd == NULL) {
 267                 pr_warn("%s(): No sensor subdev\n", __func__);
 268                 return 0;
 269         }
 270
 271         ret = fimc_pipeline_s_power(p, 0);
 272
 273         fmd = entity_to_fimc_mdev(&sd->entity);
 274
 275         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 276         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 277                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 278
 279         return ret == -ENXIO ? 0 : ret;
 280 }
 281
 282 /**
 283  * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 284  * @pipeline: video pipeline structure
 285  * @on: passed as the s_stream() callback argument
 286  */
 287 static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 288 {
 289         static const u8 seq[2][IDX_MAX] = {
 290                 { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
 291                 { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 292         };
 293         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 294         struct fimc_md *fmd = entity_to_fimc_mdev(&p->subdevs[IDX_CSIS]->entity);
 295         enum fimc_subdev_index sd_id;
 296         int i, ret = 0;
 297
 298         if (p->subdevs[IDX_SENSOR] == NULL) {
 299                 if (!fmd->user_subdev_api) {
 300                         /*
 301                          * Sensor must be already discovered if we
 302                          * aren't in the user_subdev_api mode
 303                          */
 304                         return -ENODEV;
 305                 }
 306
 307                 /* Get pipeline sink entity */
 308                 if (p->subdevs[IDX_FIMC])
 309                         sd_id = IDX_FIMC;
 310                 else if (p->subdevs[IDX_IS_ISP])
 311                         sd_id = IDX_IS_ISP;
 312                 else if (p->subdevs[IDX_FLITE])
 313                         sd_id = IDX_FLITE;
 314                 else
 315                         return -ENODEV;
 316
 317                 /*
 318                  * Sensor could have been linked between open and STREAMON -
 319                  * check if this is the case.
 320                  */
 321                 fimc_pipeline_prepare(p, &p->subdevs[sd_id]->entity);
 322
 323                 if (p->subdevs[IDX_SENSOR] == NULL)
 324                         return -ENODEV;
 325
 326                 ret = __fimc_pipeline_enable(ep, fmd);
 327                 if (ret < 0)
 328                         return ret;
 329
 330         }
 331
 332         for (i = 0; i < IDX_MAX; i++) {
 333                 unsigned int idx = seq[on][i];
 334
 335                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
 336
 337                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 338                         goto error;
 339         }
 340
 341         return 0;
 342 error:
 343         fimc_pipeline_s_power(p, !on);
 344         for (; i >= 0; i--) {
 345                 unsigned int idx = seq[on][i];
 346                 v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
 347         }
 348         return ret;
 349 }
 350
 351 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
 352 static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
 353         .open           = __fimc_pipeline_open,
 354         .close          = __fimc_pipeline_close,
 355         .set_stream     = __fimc_pipeline_s_stream,
 356 };
 357
 358 static struct exynos_media_pipeline *fimc_md_pipeline_create(
 359                                                 struct fimc_md *fmd)
 360 {
 361         struct fimc_pipeline *p;
 362
 363         p = kzalloc(sizeof(*p), GFP_KERNEL);
 364         if (!p)
 365                 return NULL;
 366
 367         list_add_tail(&p->list, &fmd->pipelines);
 368
 369         p->ep.ops = &fimc_pipeline_ops;
 370         return &p->ep;
 371 }
 372
 373 static void fimc_md_pipelines_free(struct fimc_md *fmd)
 374 {
 375         while (!list_empty(&fmd->pipelines)) {
 376                 struct fimc_pipeline *p;
 377
 378                 p = list_entry(fmd->pipelines.next, typeof(*p), list);
 379                 list_del(&p->list);
 380                 kfree(p);
 381         }
 382 }
 383
 384 /* Parse port node and register as a sub-device any sensor specified there. */
 385 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 386                                    struct device_node *port,
 387                                    unsigned int index)
 388 {
 389         struct fimc_source_info *pd = &fmd->sensor[index].pdata;
 390         struct device_node *rem, *ep, *np;
 391         struct v4l2_of_endpoint endpoint;
 392         int ret;
 393
 394         /* Assume here a port node can have only one endpoint node. */
 395         ep = of_get_next_child(port, NULL);
 396         if (!ep)
 397                 return 0;
 398
 399         ret = v4l2_of_parse_endpoint(ep, &endpoint);
 400         if (ret) {
 401                 of_node_put(ep);
 402                 return ret;
 403         }
 404
 405         if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
 406                 return -EINVAL;
 407
 408         pd->mux_id = (endpoint.base.port - 1) & 0x1;
 409
 410         rem = of_graph_get_remote_port_parent(ep);
 411         of_node_put(ep);
 412         if (rem == NULL) {
 413                 v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
 414                                                         ep->full_name);
 415                 return 0;
 416         }
 417
 418         if (fimc_input_is_parallel(endpoint.base.port)) {
 419                 if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
 420                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
 421                 else
 422                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
 423                 pd->flags = endpoint.bus.parallel.flags;
 424         } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
 425                 /*
 426                  * MIPI CSI-2: only input mux selection and
 427                  * the sensor's clock frequency is needed.
 428                  */
 429                 pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
 430         } else {
 431                 v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
 432                          endpoint.base.port, rem->full_name);
 433         }
 434         /*
 435          * For FIMC-IS handled sensors, that are placed under i2c-isp device
 436          * node, FIMC is connected to the FIMC-IS through its ISP Writeback
 437          * input. Sensors are attached to the FIMC-LITE hostdata interface
 438          * directly or through MIPI-CSIS, depending on the external media bus
 439          * used. This needs to be handled in a more reliable way, not by just
 440          * checking parent's node name.
 441          */
 442         np = of_get_parent(rem);
 443
 444         if (np && !of_node_cmp(np->name, "i2c-isp"))
 445                 pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
 446         else
 447                 pd->fimc_bus_type = pd->sensor_bus_type;
 448
 449         if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor))) {
 450                 of_node_put(rem);
 451                 return -EINVAL;
 452         }
 453
 454         fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
 455         fmd->sensor[index].asd.match.of.node = rem;
 456         fmd->async_subdevs[index] = &fmd->sensor[index].asd;
 457
 458         fmd->num_sensors++;
 459
 460         of_node_put(rem);
 461         return 0;
 462 }
 463
 464 /* Register all SoC external sub-devices */
 465 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 466 {
 467         struct device_node *parent = fmd->pdev->dev.of_node;
 468         struct device_node *node, *ports;
 469         int index = 0;
 470         int ret;
 471
 472         /*
 473          * Runtime resume one of the FIMC entities to make sure
 474          * the sclk_cam clocks are not globally disabled.
 475          */
 476         if (!fmd->pmf)
 477                 return -ENXIO;
 478
 479         ret = pm_runtime_get_sync(fmd->pmf);
 480         if (ret < 0)
 481                 return ret;
 482
 483         fmd->num_sensors = 0;
 484
 485         /* Attach sensors linked to MIPI CSI-2 receivers */
 486         for_each_available_child_of_node(parent, node) {
 487                 struct device_node *port;
 488
 489                 if (of_node_cmp(node->name, "csis"))
 490                         continue;
 491                 /* The csis node can have only port subnode. */
 492                 port = of_get_next_child(node, NULL);
 493                 if (!port)
 494                         continue;
 495
 496                 ret = fimc_md_parse_port_node(fmd, port, index);
 497                 if (ret < 0) {
 498                         of_node_put(node);
 499                         goto rpm_put;
 500                 }
 501                 index++;
 502         }
 503
 504         /* Attach sensors listed in the parallel-ports node */
 505         ports = of_get_child_by_name(parent, "parallel-ports");
 506         if (!ports)
 507                 goto rpm_put;
 508
 509         for_each_child_of_node(ports, node) {
 510                 ret = fimc_md_parse_port_node(fmd, node, index);
 511                 if (ret < 0) {
 512                         of_node_put(node);
 513                         break;
 514                 }
 515                 index++;
 516         }
 517 rpm_put:
 518         pm_runtime_put(fmd->pmf);
 519         return ret;
 520 }
 521
 522 static int __of_get_csis_id(struct device_node *np)
 523 {
 524         u32 reg = 0;
 525
 526         np = of_get_child_by_name(np, "port");
 527         if (!np)
 528                 return -EINVAL;
 529         of_property_read_u32(np, "reg", &reg);
 530         return reg - FIMC_INPUT_MIPI_CSI2_0;
 531 }
 532
 533 /*
 534  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 535  */
 536 static int register_fimc_lite_entity(struct fimc_md *fmd,
 537                                      struct fimc_lite *fimc_lite)
 538 {
 539         struct v4l2_subdev *sd;
 540         struct exynos_media_pipeline *ep;
 541         int ret;
 542
 543         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 544                     fmd->fimc_lite[fimc_lite->index]))
 545                 return -EBUSY;
 546
 547         sd = &fimc_lite->subdev;
 548         sd->grp_id = GRP_ID_FLITE;
 549
 550         ep = fimc_md_pipeline_create(fmd);
 551         if (!ep)
 552                 return -ENOMEM;
 553
 554         v4l2_set_subdev_hostdata(sd, ep);
 555
 556         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 557         if (!ret)
 558                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 559         else
 560                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 561                          fimc_lite->index);
 562         return ret;
 563 }
 564
 565 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 566 {
 567         struct v4l2_subdev *sd;
 568         struct exynos_media_pipeline *ep;
 569         int ret;
 570
 571         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 572                 return -EBUSY;
 573
 574         sd = &fimc->vid_cap.subdev;
 575         sd->grp_id = GRP_ID_FIMC;
 576
 577         ep = fimc_md_pipeline_create(fmd);
 578         if (!ep)
 579                 return -ENOMEM;
 580
 581         v4l2_set_subdev_hostdata(sd, ep);
 582
 583         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 584         if (!ret) {
 585                 if (!fmd->pmf && fimc->pdev)
 586                         fmd->pmf = &fimc->pdev->dev;
 587                 fmd->fimc[fimc->id] = fimc;
 588                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 589         } else {
 590                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 591                          fimc->id, ret);
 592         }
 593         return ret;
 594 }
 595
 596 static int register_csis_entity(struct fimc_md *fmd,
 597                                 struct platform_device *pdev,
 598                                 struct v4l2_subdev *sd)
 599 {
 600         struct device_node *node = pdev->dev.of_node;
 601         int id, ret;
 602
 603         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 604
 605         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 606                 return -ENOENT;
 607
 608         if (WARN_ON(fmd->csis[id].sd))
 609                 return -EBUSY;
 610
 611         sd->grp_id = GRP_ID_CSIS;
 612         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 613         if (!ret)
 614                 fmd->csis[id].sd = sd;
 615         else
 616                 v4l2_err(&fmd->v4l2_dev,
 617                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 618         return ret;
 619 }
 620
 621 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 622 {
 623         struct v4l2_subdev *sd = &is->isp.subdev;
 624         struct exynos_media_pipeline *ep;
 625         int ret;
 626
 627         /* Allocate pipeline object for the ISP capture video node. */
 628         ep = fimc_md_pipeline_create(fmd);
 629         if (!ep)
 630                 return -ENOMEM;
 631
 632         v4l2_set_subdev_hostdata(sd, ep);
 633
 634         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 635         if (ret) {
 636                 v4l2_err(&fmd->v4l2_dev,
 637                          "Failed to register FIMC-ISP (%d)\n", ret);
 638                 return ret;
 639         }
 640
 641         fmd->fimc_is = is;
 642         return 0;
 643 }
 644
 645 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 646                                             struct platform_device *pdev,
 647                                             int plat_entity)
 648 {
 649         struct device *dev = &pdev->dev;
 650         int ret = -EPROBE_DEFER;
 651         void *drvdata;
 652
 653         /* Lock to ensure dev->driver won't change. */
 654         device_lock(dev);
 655
 656         if (!dev->driver || !try_module_get(dev->driver->owner))
 657                 goto dev_unlock;
 658
 659         drvdata = dev_get_drvdata(dev);
 660         /* Some subdev didn't probe successfully id drvdata is NULL */
 661         if (drvdata) {
 662                 switch (plat_entity) {
 663                 case IDX_FIMC:
 664                         ret = register_fimc_entity(fmd, drvdata);
 665                         break;
 666                 case IDX_FLITE:
 667                         ret = register_fimc_lite_entity(fmd, drvdata);
 668                         break;
 669                 case IDX_CSIS:
 670                         ret = register_csis_entity(fmd, pdev, drvdata);
 671                         break;
 672                 case IDX_IS_ISP:
 673                         ret = register_fimc_is_entity(fmd, drvdata);
 674                         break;
 675                 default:
 676                         ret = -ENODEV;
 677                 }
 678         }
 679
 680         module_put(dev->driver->owner);
 681 dev_unlock:
 682         device_unlock(dev);
 683         if (ret == -EPROBE_DEFER)
 684                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 685                         dev_name(dev));
 686         else if (ret < 0)
 687                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 688                         dev_name(dev), ret);
 689         return ret;
 690 }
 691
 692 /* Register FIMC, FIMC-LITE and CSIS media entities */
 693 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 694                                               struct device_node *parent)
 695 {
 696         struct device_node *node;
 697         int ret = 0;
 698
 699         for_each_available_child_of_node(parent, node) {
 700                 struct platform_device *pdev;
 701                 int plat_entity = -1;
 702
 703                 pdev = of_find_device_by_node(node);
 704                 if (!pdev)
 705                         continue;
 706
 707                 /* If driver of any entity isn't ready try all again later. */
 708                 if (!strcmp(node->name, CSIS_OF_NODE_NAME))
 709                         plat_entity = IDX_CSIS;
 710                 else if (!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
 711                         plat_entity = IDX_IS_ISP;
 712                 else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
 713                         plat_entity = IDX_FLITE;
 714                 else if (!strcmp(node->name, FIMC_OF_NODE_NAME) &&
 715                          !of_property_read_bool(node, "samsung,lcd-wb"))
 716                         plat_entity = IDX_FIMC;
 717
 718                 if (plat_entity >= 0)
 719                         ret = fimc_md_register_platform_entity(fmd, pdev,
 720                                                         plat_entity);
 721                 put_device(&pdev->dev);
 722                 if (ret < 0) {
 723                         of_node_put(node);
 724                         break;
 725                 }
 726         }
 727
 728         return ret;
 729 }
 730
 731 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 732 {
 733         int i;
 734
 735         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 736                 struct fimc_dev *dev = fmd->fimc[i];
 737                 if (dev == NULL)
 738                         continue;
 739                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 740                 dev->vid_cap.ve.pipe = NULL;
 741                 fmd->fimc[i] = NULL;
 742         }
 743         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 744                 struct fimc_lite *dev = fmd->fimc_lite[i];
 745                 if (dev == NULL)
 746                         continue;
 747                 v4l2_device_unregister_subdev(&dev->subdev);
 748                 dev->ve.pipe = NULL;
 749                 fmd->fimc_lite[i] = NULL;
 750         }
 751         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 752                 if (fmd->csis[i].sd == NULL)
 753                         continue;
 754                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 755                 fmd->csis[i].sd = NULL;
 756         }
 757
 758         if (fmd->fimc_is)
 759                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 760
 761         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 762 }
 763
 764 /**
 765  * __fimc_md_create_fimc_links - create links to all FIMC entities
 766  * @fmd: fimc media device
 767  * @source: the source entity to create links to all fimc entities from
 768  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 769  * @pad: the source entity pad index
 770  * @link_mask: bitmask of the fimc devices for which link should be enabled
 771  */
 772 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 773                                             struct media_entity *source,
 774                                             struct v4l2_subdev *sensor,
 775                                             int pad, int link_mask)
 776 {
 777         struct fimc_source_info *si = NULL;
 778         struct media_entity *sink;
 779         unsigned int flags = 0;
 780         int i, ret = 0;
 781
 782         if (sensor) {
 783                 si = v4l2_get_subdev_hostdata(sensor);
 784                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 785                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 786                         ret = 1;
 787         }
 788
 789         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 790                 if (!fmd->fimc[i])
 791                         continue;
 792                 /*
 793                  * Some FIMC variants are not fitted with camera capture
 794                  * interface. Skip creating a link from sensor for those.
 795                  */
 796                 if (!fmd->fimc[i]->variant->has_cam_if)
 797                         continue;
 798
 799                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 800
 801                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 802                 ret = media_create_pad_link(source, pad, sink,
 803                                               FIMC_SD_PAD_SINK_CAM, flags);
 804                 if (ret)
 805                         return ret;
 806
 807                 /* Notify FIMC capture subdev entity */
 808                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 809                                         &source->pads[pad], flags);
 810                 if (ret)
 811                         break;
 812
 813                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 814                           source->name, flags ? '=' : '-', sink->name);
 815         }
 816
 817         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 818                 if (!fmd->fimc_lite[i])
 819                         continue;
 820
 821                 sink = &fmd->fimc_lite[i]->subdev.entity;
 822                 ret = media_create_pad_link(source, pad, sink,
 823                                                FLITE_SD_PAD_SINK, 0);
 824                 if (ret)
 825                         return ret;
 826
 827                 /* Notify FIMC-LITE subdev entity */
 828                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 829                                         &source->pads[pad], 0);
 830                 if (ret)
 831                         break;
 832
 833                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 834                           source->name, sink->name);
 835         }
 836         return 0;
 837 }
 838
 839 /* Create links from FIMC-LITE source pads to other entities */
 840 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 841 {
 842         struct media_entity *source, *sink;
 843         int i, ret = 0;
 844
 845         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 846                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 847
 848                 if (fimc == NULL)
 849                         continue;
 850
 851                 source = &fimc->subdev.entity;
 852                 sink = &fimc->ve.vdev.entity;
 853                 /* FIMC-LITE's subdev and video node */
 854                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
 855                                                sink, 0, 0);
 856                 if (ret)
 857                         break;
 858                 /* Link from FIMC-LITE to IS-ISP subdev */
 859                 sink = &fmd->fimc_is->isp.subdev.entity;
 860                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
 861                                                sink, 0, 0);
 862                 if (ret)
 863                         break;
 864         }
 865
 866         return ret;
 867 }
 868
 869 /* Create FIMC-IS links */
 870 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 871 {
 872         struct fimc_isp *isp = &fmd->fimc_is->isp;
 873         struct media_entity *source, *sink;
 874         int i, ret;
 875
 876         source = &isp->subdev.entity;
 877
 878         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 879                 if (fmd->fimc[i] == NULL)
 880                         continue;
 881
 882                 /* Link from FIMC-IS-ISP subdev to FIMC */
 883                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 884                 ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 885                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 886                 if (ret)
 887                         return ret;
 888         }
 889
 890         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 891         sink = &isp->video_capture.ve.vdev.entity;
 892
 893         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 894         if (sink->num_pads == 0)
 895                 return 0;
 896
 897         return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 898                                         sink, 0, 0);
 899 }
 900
 901 /**
 902  * fimc_md_create_links - create default links between registered entities
 903  *
 904  * Parallel interface sensor entities are connected directly to FIMC capture
 905  * entities. The sensors using MIPI CSIS bus are connected through immutable
 906  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 907  * entity has a link to each registered FIMC capture entity. Enabled links
 908  * are created by default between each subsequent registered sensor and
 909  * subsequent FIMC capture entity. The number of default active links is
 910  * determined by the number of available sensors or FIMC entities,
 911  * whichever is less.
 912  */
 913 static int fimc_md_create_links(struct fimc_md *fmd)
 914 {
 915         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 916         struct v4l2_subdev *sensor, *csis;
 917         struct fimc_source_info *pdata;
 918         struct media_entity *source, *sink;
 919         int i, pad, fimc_id = 0, ret = 0;
 920         u32 flags, link_mask = 0;
 921
 922         for (i = 0; i < fmd->num_sensors; i++) {
 923                 if (fmd->sensor[i].subdev == NULL)
 924                         continue;
 925
 926                 sensor = fmd->sensor[i].subdev;
 927                 pdata = v4l2_get_subdev_hostdata(sensor);
 928                 if (!pdata)
 929                         continue;
 930
 931                 source = NULL;
 932
 933                 switch (pdata->sensor_bus_type) {
 934                 case FIMC_BUS_TYPE_MIPI_CSI2:
 935                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 936                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 937                                 return -EINVAL;
 938
 939                         csis = fmd->csis[pdata->mux_id].sd;
 940                         if (WARN(csis == NULL,
 941                                  "MIPI-CSI interface specified "
 942                                  "but s5p-csis module is not loaded!\n"))
 943                                 return -EINVAL;
 944
 945                         pad = sensor->entity.num_pads - 1;
 946                         ret = media_create_pad_link(&sensor->entity, pad,
 947                                               &csis->entity, CSIS_PAD_SINK,
 948                                               MEDIA_LNK_FL_IMMUTABLE |
 949                                               MEDIA_LNK_FL_ENABLED);
 950                         if (ret)
 951                                 return ret;
 952
 953                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 954                                   sensor->entity.name, csis->entity.name);
 955
 956                         source = NULL;
 957                         csi_sensors[pdata->mux_id] = sensor;
 958                         break;
 959
 960                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
 961                         source = &sensor->entity;
 962                         pad = 0;
 963                         break;
 964
 965                 default:
 966                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 967                                  pdata->sensor_bus_type);
 968                         return -EINVAL;
 969                 }
 970                 if (source == NULL)
 971                         continue;
 972
 973                 link_mask = 1 << fimc_id++;
 974                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 975                                                        pad, link_mask);
 976         }
 977
 978         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 979                 if (fmd->csis[i].sd == NULL)
 980                         continue;
 981
 982                 source = &fmd->csis[i].sd->entity;
 983                 pad = CSIS_PAD_SOURCE;
 984                 sensor = csi_sensors[i];
 985
 986                 link_mask = 1 << fimc_id++;
 987                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 988                                                        pad, link_mask);
 989         }
 990
 991         /* Create immutable links between each FIMC's subdev and video node */
 992         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 993         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 994                 if (!fmd->fimc[i])
 995                         continue;
 996
 997                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
 998                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
 999
1000                 ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
1001                                               sink, 0, flags);
1002                 if (ret)
1003                         break;
1004         }
1005
1006         ret = __fimc_md_create_flite_source_links(fmd);
1007         if (ret < 0)
1008                 return ret;
1009
1010         if (fmd->use_isp)
1011                 ret = __fimc_md_create_fimc_is_links(fmd);
1012
1013         return ret;
1014 }
1015
1016 /*
1017  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
1018  */
1019 static void fimc_md_put_clocks(struct fimc_md *fmd)
1020 {
1021         int i = FIMC_MAX_CAMCLKS;
1022
1023         while (--i >= 0) {
1024                 if (IS_ERR(fmd->camclk[i].clock))
1025                         continue;
1026                 clk_put(fmd->camclk[i].clock);
1027                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1028         }
1029
1030         /* Writeback (PIXELASYNCMx) clocks */
1031         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
1032                 if (IS_ERR(fmd->wbclk[i]))
1033                         continue;
1034                 clk_put(fmd->wbclk[i]);
1035                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
1036         }
1037 }
1038
1039 static int fimc_md_get_clocks(struct fimc_md *fmd)
1040 {
1041         struct device *dev = &fmd->pdev->dev;
1042         char clk_name[32];
1043         struct clk *clock;
1044         int i, ret = 0;
1045
1046         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
1047                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1048
1049         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1050                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
1051                 clock = clk_get(dev, clk_name);
1052
1053                 if (IS_ERR(clock)) {
1054                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
1055                         ret = PTR_ERR(clock);
1056                         break;
1057                 }
1058                 fmd->camclk[i].clock = clock;
1059         }
1060         if (ret)
1061                 fimc_md_put_clocks(fmd);
1062
1063         if (!fmd->use_isp)
1064                 return 0;
1065         /*
1066          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
1067          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1068          */
1069         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1070
1071         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1072                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1073                 clock = clk_get(dev, clk_name);
1074                 if (IS_ERR(clock)) {
1075                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1076                                   clk_name);
1077                         ret = PTR_ERR(clock);
1078                         break;
1079                 }
1080                 fmd->wbclk[i] = clock;
1081         }
1082         if (ret)
1083                 fimc_md_put_clocks(fmd);
1084
1085         return ret;
1086 }
1087
1088 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1089 {
1090         struct exynos_video_entity *ve;
1091         struct fimc_pipeline *p;
1092         struct video_device *vdev;
1093         int ret;
1094
1095         vdev = media_entity_to_video_device(entity);
1096         if (vdev->entity.use_count == 0)
1097                 return 0;
1098
1099         ve = vdev_to_exynos_video_entity(vdev);
1100         p = to_fimc_pipeline(ve->pipe);
1101         /*
1102          * Nothing to do if we are disabling the pipeline, some link
1103          * has been disconnected and p->subdevs array is cleared now.
1104          */
1105         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1106                 return 0;
1107
1108         if (enable)
1109                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1110         else
1111                 ret = __fimc_pipeline_close(ve->pipe);
1112
1113         if (ret == 0 && !enable)
1114                 memset(p->subdevs, 0, sizeof(p->subdevs));
1115
1116         return ret;
1117 }
1118
1119 /* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
1120 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
1121                                       struct media_entity_graph *graph)
1122 {
1123         struct media_entity *entity_err = entity;
1124         int ret;
1125
1126         /*
1127          * Walk current graph and call the pipeline open/close routine for each
1128          * opened video node that belongs to the graph of entities connected
1129          * through active links. This is needed as we cannot power on/off the
1130          * subdevs in random order.
1131          */
1132         media_entity_graph_walk_start(graph, entity);
1133
1134         while ((entity = media_entity_graph_walk_next(graph))) {
1135                 if (!is_media_entity_v4l2_video_device(entity))
1136                         continue;
1137
1138                 ret  = __fimc_md_modify_pipeline(entity, enable);
1139
1140                 if (ret < 0)
1141                         goto err;
1142         }
1143
1144         return 0;
1145
1146 err:
1147         media_entity_graph_walk_start(graph, entity_err);
1148
1149         while ((entity_err = media_entity_graph_walk_next(graph))) {
1150                 if (!is_media_entity_v4l2_video_device(entity_err))
1151                         continue;
1152
1153                 __fimc_md_modify_pipeline(entity_err, !enable);
1154
1155                 if (entity_err == entity)
1156                         break;
1157         }
1158
1159         return ret;
1160 }
1161
1162 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1163                                 unsigned int notification)
1164 {
1165         struct media_entity_graph *graph =
1166                 &container_of(link->graph_obj.mdev, struct fimc_md,
1167                               media_dev)->link_setup_graph;
1168         struct media_entity *sink = link->sink->entity;
1169         int ret = 0;
1170
1171         /* Before link disconnection */
1172         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1173                 ret = media_entity_graph_walk_init(graph,
1174                                                    link->graph_obj.mdev);
1175                 if (ret)
1176                         return ret;
1177                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1178                         ret = __fimc_md_modify_pipelines(sink, false, graph);
1179 #if 0
1180                 else
1181                         /* TODO: Link state change validation */
1182 #endif
1183         /* After link activation */
1184         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
1185                 if (link->flags & MEDIA_LNK_FL_ENABLED)
1186                         ret = __fimc_md_modify_pipelines(sink, true, graph);
1187                 media_entity_graph_walk_cleanup(graph);
1188         }
1189
1190         return ret ? -EPIPE : 0;
1191 }
1192
1193 static ssize_t fimc_md_sysfs_show(struct device *dev,
1194                                   struct device_attribute *attr, char *buf)
1195 {
1196         struct platform_device *pdev = to_platform_device(dev);
1197         struct fimc_md *fmd = platform_get_drvdata(pdev);
1198
1199         if (fmd->user_subdev_api)
1200                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1201
1202         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1203 }
1204
1205 static ssize_t fimc_md_sysfs_store(struct device *dev,
1206                                    struct device_attribute *attr,
1207                                    const char *buf, size_t count)
1208 {
1209         struct platform_device *pdev = to_platform_device(dev);
1210         struct fimc_md *fmd = platform_get_drvdata(pdev);
1211         bool subdev_api;
1212         int i;
1213
1214         if (!strcmp(buf, "vid-dev\n"))
1215                 subdev_api = false;
1216         else if (!strcmp(buf, "sub-dev\n"))
1217                 subdev_api = true;
1218         else
1219                 return count;
1220
1221         fmd->user_subdev_api = subdev_api;
1222         for (i = 0; i < FIMC_MAX_DEVS; i++)
1223                 if (fmd->fimc[i])
1224                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1225         return count;
1226 }
1227 /*
1228  * This device attribute is to select video pipeline configuration method.
1229  * There are following valid values:
1230  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1231  *  by the host driver.
1232  *  sub-dev - for media controller API, subdevs must be configured in user
1233  *  space before starting streaming.
1234  */
1235 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1236                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1237
1238 static int fimc_md_get_pinctrl(struct fimc_md *fmd)
1239 {
1240         struct device *dev = &fmd->pdev->dev;
1241         struct fimc_pinctrl *pctl = &fmd->pinctl;
1242
1243         pctl->pinctrl = devm_pinctrl_get(dev);
1244         if (IS_ERR(pctl->pinctrl))
1245                 return PTR_ERR(pctl->pinctrl);
1246
1247         pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
1248                                         PINCTRL_STATE_DEFAULT);
1249         if (IS_ERR(pctl->state_default))
1250                 return PTR_ERR(pctl->state_default);
1251
1252         pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
1253                                         PINCTRL_STATE_IDLE);
1254         return 0;
1255 }
1256
1257 static int cam_clk_prepare(struct clk_hw *hw)
1258 {
1259         struct cam_clk *camclk = to_cam_clk(hw);
1260         int ret;
1261
1262         if (camclk->fmd->pmf == NULL)
1263                 return -ENODEV;
1264
1265         ret = pm_runtime_get_sync(camclk->fmd->pmf);
1266         return ret < 0 ? ret : 0;
1267 }
1268
1269 static void cam_clk_unprepare(struct clk_hw *hw)
1270 {
1271         struct cam_clk *camclk = to_cam_clk(hw);
1272
1273         if (camclk->fmd->pmf == NULL)
1274                 return;
1275
1276         pm_runtime_put_sync(camclk->fmd->pmf);
1277 }
1278
1279 static const struct clk_ops cam_clk_ops = {
1280         .prepare = cam_clk_prepare,
1281         .unprepare = cam_clk_unprepare,
1282 };
1283
1284 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1285 {
1286         struct cam_clk_provider *cp = &fmd->clk_provider;
1287         unsigned int i;
1288
1289         if (cp->of_node)
1290                 of_clk_del_provider(cp->of_node);
1291
1292         for (i = 0; i < cp->num_clocks; i++)
1293                 clk_unregister(cp->clks[i]);
1294 }
1295
1296 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1297 {
1298         struct cam_clk_provider *cp = &fmd->clk_provider;
1299         struct device *dev = &fmd->pdev->dev;
1300         int i, ret;
1301
1302         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1303                 struct cam_clk *camclk = &cp->camclk[i];
1304                 struct clk_init_data init;
1305                 const char *p_name;
1306
1307                 ret = of_property_read_string_index(dev->of_node,
1308                                         "clock-output-names", i, &init.name);
1309                 if (ret < 0)
1310                         break;
1311
1312                 p_name = __clk_get_name(fmd->camclk[i].clock);
1313
1314                 /* It's safe since clk_register() will duplicate the string. */
1315                 init.parent_names = &p_name;
1316                 init.num_parents = 1;
1317                 init.ops = &cam_clk_ops;
1318                 init.flags = CLK_SET_RATE_PARENT;
1319                 camclk->hw.init = &init;
1320                 camclk->fmd = fmd;
1321
1322                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1323                 if (IS_ERR(cp->clks[i])) {
1324                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1325                                         init.name, PTR_ERR(cp->clks[i]));
1326                         ret = PTR_ERR(cp->clks[i]);
1327                         goto err;
1328                 }
1329                 cp->num_clocks++;
1330         }
1331
1332         if (cp->num_clocks == 0) {
1333                 dev_warn(dev, "clk provider not registered\n");
1334                 return 0;
1335         }
1336
1337         cp->clk_data.clks = cp->clks;
1338         cp->clk_data.clk_num = cp->num_clocks;
1339         cp->of_node = dev->of_node;
1340         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1341                                   &cp->clk_data);
1342         if (ret == 0)
1343                 return 0;
1344 err:
1345         fimc_md_unregister_clk_provider(fmd);
1346         return ret;
1347 }
1348
1349 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1350                                  struct v4l2_subdev *subdev,
1351                                  struct v4l2_async_subdev *asd)
1352 {
1353         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1354         struct fimc_sensor_info *si = NULL;
1355         int i;
1356
1357         /* Find platform data for this sensor subdev */
1358         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1359                 if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
1360                         si = &fmd->sensor[i];
1361
1362         if (si == NULL)
1363                 return -EINVAL;
1364
1365         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1366
1367         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1368                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1369         else
1370                 subdev->grp_id = GRP_ID_SENSOR;
1371
1372         si->subdev = subdev;
1373
1374         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1375                   subdev->name, fmd->num_sensors);
1376
1377         fmd->num_sensors++;
1378
1379         return 0;
1380 }
1381
1382 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1383 {
1384         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1385         int ret;
1386
1387         mutex_lock(&fmd->media_dev.graph_mutex);
1388
1389         ret = fimc_md_create_links(fmd);
1390         if (ret < 0)
1391                 goto unlock;
1392
1393         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1394 unlock:
1395         mutex_unlock(&fmd->media_dev.graph_mutex);
1396         if (ret < 0)
1397                 return ret;
1398
1399         return media_device_register(&fmd->media_dev);
1400 }
1401
1402 static int fimc_md_probe(struct platform_device *pdev)
1403 {
1404         struct device *dev = &pdev->dev;
1405         struct v4l2_device *v4l2_dev;
1406         struct fimc_md *fmd;
1407         int ret;
1408
1409         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1410         if (!fmd)
1411                 return -ENOMEM;
1412
1413         spin_lock_init(&fmd->slock);
1414         INIT_LIST_HEAD(&fmd->pipelines);
1415         fmd->pdev = pdev;
1416
1417         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
1418                 sizeof(fmd->media_dev.model));
1419         fmd->media_dev.link_notify = fimc_md_link_notify;
1420         fmd->media_dev.dev = dev;
1421
1422         v4l2_dev = &fmd->v4l2_dev;
1423         v4l2_dev->mdev = &fmd->media_dev;
1424         v4l2_dev->notify = fimc_sensor_notify;
1425         strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1426
1427         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1428         fmd->user_subdev_api = true;
1429
1430         media_device_init(&fmd->media_dev);
1431
1432         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1433         if (ret < 0) {
1434                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1435                 return ret;
1436         }
1437
1438         ret = fimc_md_get_clocks(fmd);
1439         if (ret)
1440                 goto err_md;
1441
1442         ret = fimc_md_get_pinctrl(fmd);
1443         if (ret < 0) {
1444                 if (ret != EPROBE_DEFER)
1445                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1446                 goto err_clk;
1447         }
1448
1449         platform_set_drvdata(pdev, fmd);
1450
1451         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1452         if (ret)
1453                 goto err_clk;
1454
1455         ret = fimc_md_register_sensor_entities(fmd);
1456         if (ret)
1457                 goto err_m_ent;
1458
1459         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1460         if (ret)
1461                 goto err_m_ent;
1462         /*
1463          * FIMC platform devices need to be registered before the sclk_cam
1464          * clocks provider, as one of these devices needs to be activated
1465          * to enable the clock.
1466          */
1467         ret = fimc_md_register_clk_provider(fmd);
1468         if (ret < 0) {
1469                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1470                 goto err_attr;
1471         }
1472
1473         if (fmd->num_sensors > 0) {
1474                 fmd->subdev_notifier.subdevs = fmd->async_subdevs;
1475                 fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
1476                 fmd->subdev_notifier.bound = subdev_notifier_bound;
1477                 fmd->subdev_notifier.complete = subdev_notifier_complete;
1478                 fmd->num_sensors = 0;
1479
1480                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1481                                                 &fmd->subdev_notifier);
1482                 if (ret)
1483                         goto err_clk_p;
1484         }
1485
1486         return 0;
1487
1488 err_clk_p:
1489         fimc_md_unregister_clk_provider(fmd);
1490 err_attr:
1491         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1492 err_clk:
1493         fimc_md_put_clocks(fmd);
1494 err_m_ent:
1495         fimc_md_unregister_entities(fmd);
1496 err_md:
1497         media_device_cleanup(&fmd->media_dev);
1498         v4l2_device_unregister(&fmd->v4l2_dev);
1499         return ret;
1500 }
1501
1502 static int fimc_md_remove(struct platform_device *pdev)
1503 {
1504         struct fimc_md *fmd = platform_get_drvdata(pdev);
1505
1506         if (!fmd)
1507                 return 0;
1508
1509         fimc_md_unregister_clk_provider(fmd);
1510         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1511
1512         v4l2_device_unregister(&fmd->v4l2_dev);
1513         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1514         fimc_md_unregister_entities(fmd);
1515         fimc_md_pipelines_free(fmd);
1516         media_device_unregister(&fmd->media_dev);
1517         media_device_cleanup(&fmd->media_dev);
1518         fimc_md_put_clocks(fmd);
1519
1520         return 0;
1521 }
1522
1523 static const struct platform_device_id fimc_driver_ids[] __always_unused = {
1524         { .name = "s5p-fimc-md" },
1525         { },
1526 };
1527 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1528
1529 static const struct of_device_id fimc_md_of_match[] = {
1530         { .compatible = "samsung,fimc" },
1531         { },
1532 };
1533 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1534
1535 static struct platform_driver fimc_md_driver = {
1536         .probe          = fimc_md_probe,
1537         .remove         = fimc_md_remove,
1538         .driver = {
1539                 .of_match_table = of_match_ptr(fimc_md_of_match),
1540                 .name           = "s5p-fimc-md",
1541         }
1542 };
1543
1544 static int __init fimc_md_init(void)
1545 {
1546         int ret;
1547
1548         request_module("s5p-csis");
1549         ret = fimc_register_driver();
1550         if (ret)
1551                 return ret;
1552
1553         return platform_driver_register(&fimc_md_driver);
1554 }
1555
1556 static void __exit fimc_md_exit(void)
1557 {
1558         platform_driver_unregister(&fimc_md_driver);
1559         fimc_unregister_driver();
1560 }
1561
1562 module_init(fimc_md_init);
1563 module_exit(fimc_md_exit);
1564
1565 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1566 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1567 MODULE_LICENSE("GPL");
1568 MODULE_VERSION("2.0.1");