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                 return -EINVAL;
 451
 452         fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
 453         fmd->sensor[index].asd.match.of.node = rem;
 454         fmd->async_subdevs[index] = &fmd->sensor[index].asd;
 455
 456         fmd->num_sensors++;
 457
 458         of_node_put(rem);
 459         return 0;
 460 }
 461
 462 /* Register all SoC external sub-devices */
 463 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 464 {
 465         struct device_node *parent = fmd->pdev->dev.of_node;
 466         struct device_node *node, *ports;
 467         int index = 0;
 468         int ret;
 469
 470         /*
 471          * Runtime resume one of the FIMC entities to make sure
 472          * the sclk_cam clocks are not globally disabled.
 473          */
 474         if (!fmd->pmf)
 475                 return -ENXIO;
 476
 477         ret = pm_runtime_get_sync(fmd->pmf);
 478         if (ret < 0)
 479                 return ret;
 480
 481         fmd->num_sensors = 0;
 482
 483         /* Attach sensors linked to MIPI CSI-2 receivers */
 484         for_each_available_child_of_node(parent, node) {
 485                 struct device_node *port;
 486
 487                 if (of_node_cmp(node->name, "csis"))
 488                         continue;
 489                 /* The csis node can have only port subnode. */
 490                 port = of_get_next_child(node, NULL);
 491                 if (!port)
 492                         continue;
 493
 494                 ret = fimc_md_parse_port_node(fmd, port, index);
 495                 if (ret < 0) {
 496                         of_node_put(node);
 497                         goto rpm_put;
 498                 }
 499                 index++;
 500         }
 501
 502         /* Attach sensors listed in the parallel-ports node */
 503         ports = of_get_child_by_name(parent, "parallel-ports");
 504         if (!ports)
 505                 goto rpm_put;
 506
 507         for_each_child_of_node(ports, node) {
 508                 ret = fimc_md_parse_port_node(fmd, node, index);
 509                 if (ret < 0) {
 510                         of_node_put(node);
 511                         break;
 512                 }
 513                 index++;
 514         }
 515 rpm_put:
 516         pm_runtime_put(fmd->pmf);
 517         return ret;
 518 }
 519
 520 static int __of_get_csis_id(struct device_node *np)
 521 {
 522         u32 reg = 0;
 523
 524         np = of_get_child_by_name(np, "port");
 525         if (!np)
 526                 return -EINVAL;
 527         of_property_read_u32(np, "reg", &reg);
 528         return reg - FIMC_INPUT_MIPI_CSI2_0;
 529 }
 530
 531 /*
 532  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 533  */
 534 static int register_fimc_lite_entity(struct fimc_md *fmd,
 535                                      struct fimc_lite *fimc_lite)
 536 {
 537         struct v4l2_subdev *sd;
 538         struct exynos_media_pipeline *ep;
 539         int ret;
 540
 541         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 542                     fmd->fimc_lite[fimc_lite->index]))
 543                 return -EBUSY;
 544
 545         sd = &fimc_lite->subdev;
 546         sd->grp_id = GRP_ID_FLITE;
 547
 548         ep = fimc_md_pipeline_create(fmd);
 549         if (!ep)
 550                 return -ENOMEM;
 551
 552         v4l2_set_subdev_hostdata(sd, ep);
 553
 554         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 555         if (!ret)
 556                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 557         else
 558                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 559                          fimc_lite->index);
 560         return ret;
 561 }
 562
 563 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 564 {
 565         struct v4l2_subdev *sd;
 566         struct exynos_media_pipeline *ep;
 567         int ret;
 568
 569         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 570                 return -EBUSY;
 571
 572         sd = &fimc->vid_cap.subdev;
 573         sd->grp_id = GRP_ID_FIMC;
 574
 575         ep = fimc_md_pipeline_create(fmd);
 576         if (!ep)
 577                 return -ENOMEM;
 578
 579         v4l2_set_subdev_hostdata(sd, ep);
 580
 581         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 582         if (!ret) {
 583                 if (!fmd->pmf && fimc->pdev)
 584                         fmd->pmf = &fimc->pdev->dev;
 585                 fmd->fimc[fimc->id] = fimc;
 586                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 587         } else {
 588                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 589                          fimc->id, ret);
 590         }
 591         return ret;
 592 }
 593
 594 static int register_csis_entity(struct fimc_md *fmd,
 595                                 struct platform_device *pdev,
 596                                 struct v4l2_subdev *sd)
 597 {
 598         struct device_node *node = pdev->dev.of_node;
 599         int id, ret;
 600
 601         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 602
 603         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 604                 return -ENOENT;
 605
 606         if (WARN_ON(fmd->csis[id].sd))
 607                 return -EBUSY;
 608
 609         sd->grp_id = GRP_ID_CSIS;
 610         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 611         if (!ret)
 612                 fmd->csis[id].sd = sd;
 613         else
 614                 v4l2_err(&fmd->v4l2_dev,
 615                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 616         return ret;
 617 }
 618
 619 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 620 {
 621         struct v4l2_subdev *sd = &is->isp.subdev;
 622         struct exynos_media_pipeline *ep;
 623         int ret;
 624
 625         /* Allocate pipeline object for the ISP capture video node. */
 626         ep = fimc_md_pipeline_create(fmd);
 627         if (!ep)
 628                 return -ENOMEM;
 629
 630         v4l2_set_subdev_hostdata(sd, ep);
 631
 632         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 633         if (ret) {
 634                 v4l2_err(&fmd->v4l2_dev,
 635                          "Failed to register FIMC-ISP (%d)\n", ret);
 636                 return ret;
 637         }
 638
 639         fmd->fimc_is = is;
 640         return 0;
 641 }
 642
 643 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 644                                             struct platform_device *pdev,
 645                                             int plat_entity)
 646 {
 647         struct device *dev = &pdev->dev;
 648         int ret = -EPROBE_DEFER;
 649         void *drvdata;
 650
 651         /* Lock to ensure dev->driver won't change. */
 652         device_lock(dev);
 653
 654         if (!dev->driver || !try_module_get(dev->driver->owner))
 655                 goto dev_unlock;
 656
 657         drvdata = dev_get_drvdata(dev);
 658         /* Some subdev didn't probe successfully id drvdata is NULL */
 659         if (drvdata) {
 660                 switch (plat_entity) {
 661                 case IDX_FIMC:
 662                         ret = register_fimc_entity(fmd, drvdata);
 663                         break;
 664                 case IDX_FLITE:
 665                         ret = register_fimc_lite_entity(fmd, drvdata);
 666                         break;
 667                 case IDX_CSIS:
 668                         ret = register_csis_entity(fmd, pdev, drvdata);
 669                         break;
 670                 case IDX_IS_ISP:
 671                         ret = register_fimc_is_entity(fmd, drvdata);
 672                         break;
 673                 default:
 674                         ret = -ENODEV;
 675                 }
 676         }
 677
 678         module_put(dev->driver->owner);
 679 dev_unlock:
 680         device_unlock(dev);
 681         if (ret == -EPROBE_DEFER)
 682                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 683                         dev_name(dev));
 684         else if (ret < 0)
 685                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 686                         dev_name(dev), ret);
 687         return ret;
 688 }
 689
 690 /* Register FIMC, FIMC-LITE and CSIS media entities */
 691 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 692                                               struct device_node *parent)
 693 {
 694         struct device_node *node;
 695         int ret = 0;
 696
 697         for_each_available_child_of_node(parent, node) {
 698                 struct platform_device *pdev;
 699                 int plat_entity = -1;
 700
 701                 pdev = of_find_device_by_node(node);
 702                 if (!pdev)
 703                         continue;
 704
 705                 /* If driver of any entity isn't ready try all again later. */
 706                 if (!strcmp(node->name, CSIS_OF_NODE_NAME))
 707                         plat_entity = IDX_CSIS;
 708                 else if (!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
 709                         plat_entity = IDX_IS_ISP;
 710                 else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
 711                         plat_entity = IDX_FLITE;
 712                 else if (!strcmp(node->name, FIMC_OF_NODE_NAME) &&
 713                          !of_property_read_bool(node, "samsung,lcd-wb"))
 714                         plat_entity = IDX_FIMC;
 715
 716                 if (plat_entity >= 0)
 717                         ret = fimc_md_register_platform_entity(fmd, pdev,
 718                                                         plat_entity);
 719                 put_device(&pdev->dev);
 720                 if (ret < 0) {
 721                         of_node_put(node);
 722                         break;
 723                 }
 724         }
 725
 726         return ret;
 727 }
 728
 729 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 730 {
 731         int i;
 732
 733         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 734                 struct fimc_dev *dev = fmd->fimc[i];
 735                 if (dev == NULL)
 736                         continue;
 737                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 738                 dev->vid_cap.ve.pipe = NULL;
 739                 fmd->fimc[i] = NULL;
 740         }
 741         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 742                 struct fimc_lite *dev = fmd->fimc_lite[i];
 743                 if (dev == NULL)
 744                         continue;
 745                 v4l2_device_unregister_subdev(&dev->subdev);
 746                 dev->ve.pipe = NULL;
 747                 fmd->fimc_lite[i] = NULL;
 748         }
 749         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 750                 if (fmd->csis[i].sd == NULL)
 751                         continue;
 752                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 753                 fmd->csis[i].sd = NULL;
 754         }
 755
 756         if (fmd->fimc_is)
 757                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 758
 759         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 760 }
 761
 762 /**
 763  * __fimc_md_create_fimc_links - create links to all FIMC entities
 764  * @fmd: fimc media device
 765  * @source: the source entity to create links to all fimc entities from
 766  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 767  * @pad: the source entity pad index
 768  * @link_mask: bitmask of the fimc devices for which link should be enabled
 769  */
 770 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 771                                             struct media_entity *source,
 772                                             struct v4l2_subdev *sensor,
 773                                             int pad, int link_mask)
 774 {
 775         struct fimc_source_info *si = NULL;
 776         struct media_entity *sink;
 777         unsigned int flags = 0;
 778         int i, ret = 0;
 779
 780         if (sensor) {
 781                 si = v4l2_get_subdev_hostdata(sensor);
 782                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 783                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 784                         ret = 1;
 785         }
 786
 787         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 788                 if (!fmd->fimc[i])
 789                         continue;
 790                 /*
 791                  * Some FIMC variants are not fitted with camera capture
 792                  * interface. Skip creating a link from sensor for those.
 793                  */
 794                 if (!fmd->fimc[i]->variant->has_cam_if)
 795                         continue;
 796
 797                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 798
 799                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 800                 ret = media_create_pad_link(source, pad, sink,
 801                                               FIMC_SD_PAD_SINK_CAM, flags);
 802                 if (ret)
 803                         return ret;
 804
 805                 /* Notify FIMC capture subdev entity */
 806                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 807                                         &source->pads[pad], flags);
 808                 if (ret)
 809                         break;
 810
 811                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 812                           source->name, flags ? '=' : '-', sink->name);
 813         }
 814
 815         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 816                 if (!fmd->fimc_lite[i])
 817                         continue;
 818
 819                 sink = &fmd->fimc_lite[i]->subdev.entity;
 820                 ret = media_create_pad_link(source, pad, sink,
 821                                                FLITE_SD_PAD_SINK, 0);
 822                 if (ret)
 823                         return ret;
 824
 825                 /* Notify FIMC-LITE subdev entity */
 826                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 827                                         &source->pads[pad], 0);
 828                 if (ret)
 829                         break;
 830
 831                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 832                           source->name, sink->name);
 833         }
 834         return 0;
 835 }
 836
 837 /* Create links from FIMC-LITE source pads to other entities */
 838 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 839 {
 840         struct media_entity *source, *sink;
 841         int i, ret = 0;
 842
 843         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 844                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 845
 846                 if (fimc == NULL)
 847                         continue;
 848
 849                 source = &fimc->subdev.entity;
 850                 sink = &fimc->ve.vdev.entity;
 851                 /* FIMC-LITE's subdev and video node */
 852                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
 853                                                sink, 0, 0);
 854                 if (ret)
 855                         break;
 856                 /* Link from FIMC-LITE to IS-ISP subdev */
 857                 sink = &fmd->fimc_is->isp.subdev.entity;
 858                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
 859                                                sink, 0, 0);
 860                 if (ret)
 861                         break;
 862         }
 863
 864         return ret;
 865 }
 866
 867 /* Create FIMC-IS links */
 868 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 869 {
 870         struct fimc_isp *isp = &fmd->fimc_is->isp;
 871         struct media_entity *source, *sink;
 872         int i, ret;
 873
 874         source = &isp->subdev.entity;
 875
 876         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 877                 if (fmd->fimc[i] == NULL)
 878                         continue;
 879
 880                 /* Link from FIMC-IS-ISP subdev to FIMC */
 881                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 882                 ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 883                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 884                 if (ret)
 885                         return ret;
 886         }
 887
 888         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 889         sink = &isp->video_capture.ve.vdev.entity;
 890
 891         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 892         if (sink->num_pads == 0)
 893                 return 0;
 894
 895         return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 896                                         sink, 0, 0);
 897 }
 898
 899 /**
 900  * fimc_md_create_links - create default links between registered entities
 901  *
 902  * Parallel interface sensor entities are connected directly to FIMC capture
 903  * entities. The sensors using MIPI CSIS bus are connected through immutable
 904  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 905  * entity has a link to each registered FIMC capture entity. Enabled links
 906  * are created by default between each subsequent registered sensor and
 907  * subsequent FIMC capture entity. The number of default active links is
 908  * determined by the number of available sensors or FIMC entities,
 909  * whichever is less.
 910  */
 911 static int fimc_md_create_links(struct fimc_md *fmd)
 912 {
 913         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 914         struct v4l2_subdev *sensor, *csis;
 915         struct fimc_source_info *pdata;
 916         struct media_entity *source, *sink;
 917         int i, pad, fimc_id = 0, ret = 0;
 918         u32 flags, link_mask = 0;
 919
 920         for (i = 0; i < fmd->num_sensors; i++) {
 921                 if (fmd->sensor[i].subdev == NULL)
 922                         continue;
 923
 924                 sensor = fmd->sensor[i].subdev;
 925                 pdata = v4l2_get_subdev_hostdata(sensor);
 926                 if (!pdata)
 927                         continue;
 928
 929                 source = NULL;
 930
 931                 switch (pdata->sensor_bus_type) {
 932                 case FIMC_BUS_TYPE_MIPI_CSI2:
 933                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 934                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 935                                 return -EINVAL;
 936
 937                         csis = fmd->csis[pdata->mux_id].sd;
 938                         if (WARN(csis == NULL,
 939                                  "MIPI-CSI interface specified "
 940                                  "but s5p-csis module is not loaded!\n"))
 941                                 return -EINVAL;
 942
 943                         pad = sensor->entity.num_pads - 1;
 944                         ret = media_create_pad_link(&sensor->entity, pad,
 945                                               &csis->entity, CSIS_PAD_SINK,
 946                                               MEDIA_LNK_FL_IMMUTABLE |
 947                                               MEDIA_LNK_FL_ENABLED);
 948                         if (ret)
 949                                 return ret;
 950
 951                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 952                                   sensor->entity.name, csis->entity.name);
 953
 954                         source = NULL;
 955                         csi_sensors[pdata->mux_id] = sensor;
 956                         break;
 957
 958                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
 959                         source = &sensor->entity;
 960                         pad = 0;
 961                         break;
 962
 963                 default:
 964                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 965                                  pdata->sensor_bus_type);
 966                         return -EINVAL;
 967                 }
 968                 if (source == NULL)
 969                         continue;
 970
 971                 link_mask = 1 << fimc_id++;
 972                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 973                                                        pad, link_mask);
 974         }
 975
 976         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 977                 if (fmd->csis[i].sd == NULL)
 978                         continue;
 979
 980                 source = &fmd->csis[i].sd->entity;
 981                 pad = CSIS_PAD_SOURCE;
 982                 sensor = csi_sensors[i];
 983
 984                 link_mask = 1 << fimc_id++;
 985                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 986                                                        pad, link_mask);
 987         }
 988
 989         /* Create immutable links between each FIMC's subdev and video node */
 990         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 991         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 992                 if (!fmd->fimc[i])
 993                         continue;
 994
 995                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
 996                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
 997
 998                 ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
 999                                               sink, 0, flags);
1000                 if (ret)
1001                         break;
1002         }
1003
1004         ret = __fimc_md_create_flite_source_links(fmd);
1005         if (ret < 0)
1006                 return ret;
1007
1008         if (fmd->use_isp)
1009                 ret = __fimc_md_create_fimc_is_links(fmd);
1010
1011         return ret;
1012 }
1013
1014 /*
1015  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
1016  */
1017 static void fimc_md_put_clocks(struct fimc_md *fmd)
1018 {
1019         int i = FIMC_MAX_CAMCLKS;
1020
1021         while (--i >= 0) {
1022                 if (IS_ERR(fmd->camclk[i].clock))
1023                         continue;
1024                 clk_put(fmd->camclk[i].clock);
1025                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1026         }
1027
1028         /* Writeback (PIXELASYNCMx) clocks */
1029         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
1030                 if (IS_ERR(fmd->wbclk[i]))
1031                         continue;
1032                 clk_put(fmd->wbclk[i]);
1033                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
1034         }
1035 }
1036
1037 static int fimc_md_get_clocks(struct fimc_md *fmd)
1038 {
1039         struct device *dev = &fmd->pdev->dev;
1040         char clk_name[32];
1041         struct clk *clock;
1042         int i, ret = 0;
1043
1044         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
1045                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1046
1047         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1048                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
1049                 clock = clk_get(dev, clk_name);
1050
1051                 if (IS_ERR(clock)) {
1052                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
1053                         ret = PTR_ERR(clock);
1054                         break;
1055                 }
1056                 fmd->camclk[i].clock = clock;
1057         }
1058         if (ret)
1059                 fimc_md_put_clocks(fmd);
1060
1061         if (!fmd->use_isp)
1062                 return 0;
1063         /*
1064          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
1065          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1066          */
1067         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1068
1069         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1070                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1071                 clock = clk_get(dev, clk_name);
1072                 if (IS_ERR(clock)) {
1073                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1074                                   clk_name);
1075                         ret = PTR_ERR(clock);
1076                         break;
1077                 }
1078                 fmd->wbclk[i] = clock;
1079         }
1080         if (ret)
1081                 fimc_md_put_clocks(fmd);
1082
1083         return ret;
1084 }
1085
1086 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1087 {
1088         struct exynos_video_entity *ve;
1089         struct fimc_pipeline *p;
1090         struct video_device *vdev;
1091         int ret;
1092
1093         vdev = media_entity_to_video_device(entity);
1094         if (vdev->entity.use_count == 0)
1095                 return 0;
1096
1097         ve = vdev_to_exynos_video_entity(vdev);
1098         p = to_fimc_pipeline(ve->pipe);
1099         /*
1100          * Nothing to do if we are disabling the pipeline, some link
1101          * has been disconnected and p->subdevs array is cleared now.
1102          */
1103         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1104                 return 0;
1105
1106         if (enable)
1107                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1108         else
1109                 ret = __fimc_pipeline_close(ve->pipe);
1110
1111         if (ret == 0 && !enable)
1112                 memset(p->subdevs, 0, sizeof(p->subdevs));
1113
1114         return ret;
1115 }
1116
1117 /* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
1118 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
1119                                       struct media_entity_graph *graph)
1120 {
1121         struct media_entity *entity_err = entity;
1122         int ret;
1123
1124         /*
1125          * Walk current graph and call the pipeline open/close routine for each
1126          * opened video node that belongs to the graph of entities connected
1127          * through active links. This is needed as we cannot power on/off the
1128          * subdevs in random order.
1129          */
1130         media_entity_graph_walk_start(graph, entity);
1131
1132         while ((entity = media_entity_graph_walk_next(graph))) {
1133                 if (!is_media_entity_v4l2_io(entity))
1134                         continue;
1135
1136                 ret  = __fimc_md_modify_pipeline(entity, enable);
1137
1138                 if (ret < 0)
1139                         goto err;
1140         }
1141
1142         return 0;
1143
1144 err:
1145         media_entity_graph_walk_start(graph, entity_err);
1146
1147         while ((entity_err = media_entity_graph_walk_next(graph))) {
1148                 if (!is_media_entity_v4l2_io(entity_err))
1149                         continue;
1150
1151                 __fimc_md_modify_pipeline(entity_err, !enable);
1152
1153                 if (entity_err == entity)
1154                         break;
1155         }
1156
1157         return ret;
1158 }
1159
1160 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1161                                 unsigned int notification)
1162 {
1163         struct media_entity_graph *graph =
1164                 &container_of(link->graph_obj.mdev, struct fimc_md,
1165                               media_dev)->link_setup_graph;
1166         struct media_entity *sink = link->sink->entity;
1167         int ret = 0;
1168
1169         /* Before link disconnection */
1170         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1171                 ret = media_entity_graph_walk_init(graph,
1172                                                    link->graph_obj.mdev);
1173                 if (ret)
1174                         return ret;
1175                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1176                         ret = __fimc_md_modify_pipelines(sink, false, graph);
1177 #if 0
1178                 else
1179                         /* TODO: Link state change validation */
1180 #endif
1181         /* After link activation */
1182         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
1183                 if (link->flags & MEDIA_LNK_FL_ENABLED)
1184                         ret = __fimc_md_modify_pipelines(sink, true, graph);
1185                 media_entity_graph_walk_cleanup(graph);
1186         }
1187
1188         return ret ? -EPIPE : 0;
1189 }
1190
1191 static ssize_t fimc_md_sysfs_show(struct device *dev,
1192                                   struct device_attribute *attr, char *buf)
1193 {
1194         struct platform_device *pdev = to_platform_device(dev);
1195         struct fimc_md *fmd = platform_get_drvdata(pdev);
1196
1197         if (fmd->user_subdev_api)
1198                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1199
1200         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1201 }
1202
1203 static ssize_t fimc_md_sysfs_store(struct device *dev,
1204                                    struct device_attribute *attr,
1205                                    const char *buf, size_t count)
1206 {
1207         struct platform_device *pdev = to_platform_device(dev);
1208         struct fimc_md *fmd = platform_get_drvdata(pdev);
1209         bool subdev_api;
1210         int i;
1211
1212         if (!strcmp(buf, "vid-dev\n"))
1213                 subdev_api = false;
1214         else if (!strcmp(buf, "sub-dev\n"))
1215                 subdev_api = true;
1216         else
1217                 return count;
1218
1219         fmd->user_subdev_api = subdev_api;
1220         for (i = 0; i < FIMC_MAX_DEVS; i++)
1221                 if (fmd->fimc[i])
1222                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1223         return count;
1224 }
1225 /*
1226  * This device attribute is to select video pipeline configuration method.
1227  * There are following valid values:
1228  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1229  *  by the host driver.
1230  *  sub-dev - for media controller API, subdevs must be configured in user
1231  *  space before starting streaming.
1232  */
1233 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1234                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1235
1236 static int fimc_md_get_pinctrl(struct fimc_md *fmd)
1237 {
1238         struct device *dev = &fmd->pdev->dev;
1239         struct fimc_pinctrl *pctl = &fmd->pinctl;
1240
1241         pctl->pinctrl = devm_pinctrl_get(dev);
1242         if (IS_ERR(pctl->pinctrl))
1243                 return PTR_ERR(pctl->pinctrl);
1244
1245         pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
1246                                         PINCTRL_STATE_DEFAULT);
1247         if (IS_ERR(pctl->state_default))
1248                 return PTR_ERR(pctl->state_default);
1249
1250         pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
1251                                         PINCTRL_STATE_IDLE);
1252         return 0;
1253 }
1254
1255 static int cam_clk_prepare(struct clk_hw *hw)
1256 {
1257         struct cam_clk *camclk = to_cam_clk(hw);
1258         int ret;
1259
1260         if (camclk->fmd->pmf == NULL)
1261                 return -ENODEV;
1262
1263         ret = pm_runtime_get_sync(camclk->fmd->pmf);
1264         return ret < 0 ? ret : 0;
1265 }
1266
1267 static void cam_clk_unprepare(struct clk_hw *hw)
1268 {
1269         struct cam_clk *camclk = to_cam_clk(hw);
1270
1271         if (camclk->fmd->pmf == NULL)
1272                 return;
1273
1274         pm_runtime_put_sync(camclk->fmd->pmf);
1275 }
1276
1277 static const struct clk_ops cam_clk_ops = {
1278         .prepare = cam_clk_prepare,
1279         .unprepare = cam_clk_unprepare,
1280 };
1281
1282 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1283 {
1284         struct cam_clk_provider *cp = &fmd->clk_provider;
1285         unsigned int i;
1286
1287         if (cp->of_node)
1288                 of_clk_del_provider(cp->of_node);
1289
1290         for (i = 0; i < cp->num_clocks; i++)
1291                 clk_unregister(cp->clks[i]);
1292 }
1293
1294 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1295 {
1296         struct cam_clk_provider *cp = &fmd->clk_provider;
1297         struct device *dev = &fmd->pdev->dev;
1298         int i, ret;
1299
1300         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1301                 struct cam_clk *camclk = &cp->camclk[i];
1302                 struct clk_init_data init;
1303                 const char *p_name;
1304
1305                 ret = of_property_read_string_index(dev->of_node,
1306                                         "clock-output-names", i, &init.name);
1307                 if (ret < 0)
1308                         break;
1309
1310                 p_name = __clk_get_name(fmd->camclk[i].clock);
1311
1312                 /* It's safe since clk_register() will duplicate the string. */
1313                 init.parent_names = &p_name;
1314                 init.num_parents = 1;
1315                 init.ops = &cam_clk_ops;
1316                 init.flags = CLK_SET_RATE_PARENT;
1317                 camclk->hw.init = &init;
1318                 camclk->fmd = fmd;
1319
1320                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1321                 if (IS_ERR(cp->clks[i])) {
1322                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1323                                         init.name, PTR_ERR(cp->clks[i]));
1324                         ret = PTR_ERR(cp->clks[i]);
1325                         goto err;
1326                 }
1327                 cp->num_clocks++;
1328         }
1329
1330         if (cp->num_clocks == 0) {
1331                 dev_warn(dev, "clk provider not registered\n");
1332                 return 0;
1333         }
1334
1335         cp->clk_data.clks = cp->clks;
1336         cp->clk_data.clk_num = cp->num_clocks;
1337         cp->of_node = dev->of_node;
1338         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1339                                   &cp->clk_data);
1340         if (ret == 0)
1341                 return 0;
1342 err:
1343         fimc_md_unregister_clk_provider(fmd);
1344         return ret;
1345 }
1346
1347 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1348                                  struct v4l2_subdev *subdev,
1349                                  struct v4l2_async_subdev *asd)
1350 {
1351         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1352         struct fimc_sensor_info *si = NULL;
1353         int i;
1354
1355         /* Find platform data for this sensor subdev */
1356         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1357                 if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
1358                         si = &fmd->sensor[i];
1359
1360         if (si == NULL)
1361                 return -EINVAL;
1362
1363         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1364
1365         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1366                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1367         else
1368                 subdev->grp_id = GRP_ID_SENSOR;
1369
1370         si->subdev = subdev;
1371
1372         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1373                   subdev->name, fmd->num_sensors);
1374
1375         fmd->num_sensors++;
1376
1377         return 0;
1378 }
1379
1380 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1381 {
1382         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1383         int ret;
1384
1385         mutex_lock(&fmd->media_dev.graph_mutex);
1386
1387         ret = fimc_md_create_links(fmd);
1388         if (ret < 0)
1389                 goto unlock;
1390
1391         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1392 unlock:
1393         mutex_unlock(&fmd->media_dev.graph_mutex);
1394         if (ret < 0)
1395                 return ret;
1396
1397         return media_device_register(&fmd->media_dev);
1398 }
1399
1400 static int fimc_md_probe(struct platform_device *pdev)
1401 {
1402         struct device *dev = &pdev->dev;
1403         struct v4l2_device *v4l2_dev;
1404         struct fimc_md *fmd;
1405         int ret;
1406
1407         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1408         if (!fmd)
1409                 return -ENOMEM;
1410
1411         spin_lock_init(&fmd->slock);
1412         INIT_LIST_HEAD(&fmd->pipelines);
1413         fmd->pdev = pdev;
1414
1415         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
1416                 sizeof(fmd->media_dev.model));
1417         fmd->media_dev.link_notify = fimc_md_link_notify;
1418         fmd->media_dev.dev = dev;
1419
1420         v4l2_dev = &fmd->v4l2_dev;
1421         v4l2_dev->mdev = &fmd->media_dev;
1422         v4l2_dev->notify = fimc_sensor_notify;
1423         strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1424
1425         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1426         fmd->user_subdev_api = true;
1427
1428         media_device_init(&fmd->media_dev);
1429
1430         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1431         if (ret < 0) {
1432                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1433                 return ret;
1434         }
1435
1436         ret = fimc_md_get_clocks(fmd);
1437         if (ret)
1438                 goto err_md;
1439
1440         ret = fimc_md_get_pinctrl(fmd);
1441         if (ret < 0) {
1442                 if (ret != EPROBE_DEFER)
1443                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1444                 goto err_clk;
1445         }
1446
1447         platform_set_drvdata(pdev, fmd);
1448
1449         /* Protect the media graph while we're registering entities */
1450         mutex_lock(&fmd->media_dev.graph_mutex);
1451
1452         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1453         if (ret) {
1454                 mutex_unlock(&fmd->media_dev.graph_mutex);
1455                 goto err_clk;
1456         }
1457
1458         ret = fimc_md_register_sensor_entities(fmd);
1459         if (ret) {
1460                 mutex_unlock(&fmd->media_dev.graph_mutex);
1461                 goto err_m_ent;
1462         }
1463
1464         mutex_unlock(&fmd->media_dev.graph_mutex);
1465
1466         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1467         if (ret)
1468                 goto err_m_ent;
1469         /*
1470          * FIMC platform devices need to be registered before the sclk_cam
1471          * clocks provider, as one of these devices needs to be activated
1472          * to enable the clock.
1473          */
1474         ret = fimc_md_register_clk_provider(fmd);
1475         if (ret < 0) {
1476                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1477                 goto err_attr;
1478         }
1479
1480         if (fmd->num_sensors > 0) {
1481                 fmd->subdev_notifier.subdevs = fmd->async_subdevs;
1482                 fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
1483                 fmd->subdev_notifier.bound = subdev_notifier_bound;
1484                 fmd->subdev_notifier.complete = subdev_notifier_complete;
1485                 fmd->num_sensors = 0;
1486
1487                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1488                                                 &fmd->subdev_notifier);
1489                 if (ret)
1490                         goto err_clk_p;
1491         }
1492
1493         return 0;
1494
1495 err_clk_p:
1496         fimc_md_unregister_clk_provider(fmd);
1497 err_attr:
1498         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1499 err_clk:
1500         fimc_md_put_clocks(fmd);
1501 err_m_ent:
1502         fimc_md_unregister_entities(fmd);
1503 err_md:
1504         media_device_cleanup(&fmd->media_dev);
1505         v4l2_device_unregister(&fmd->v4l2_dev);
1506         return ret;
1507 }
1508
1509 static int fimc_md_remove(struct platform_device *pdev)
1510 {
1511         struct fimc_md *fmd = platform_get_drvdata(pdev);
1512
1513         if (!fmd)
1514                 return 0;
1515
1516         fimc_md_unregister_clk_provider(fmd);
1517         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1518
1519         v4l2_device_unregister(&fmd->v4l2_dev);
1520         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1521         fimc_md_unregister_entities(fmd);
1522         fimc_md_pipelines_free(fmd);
1523         media_device_unregister(&fmd->media_dev);
1524         media_device_cleanup(&fmd->media_dev);
1525         fimc_md_put_clocks(fmd);
1526
1527         return 0;
1528 }
1529
1530 static const struct platform_device_id fimc_driver_ids[] __always_unused = {
1531         { .name = "s5p-fimc-md" },
1532         { },
1533 };
1534 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1535
1536 static const struct of_device_id fimc_md_of_match[] = {
1537         { .compatible = "samsung,fimc" },
1538         { },
1539 };
1540 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1541
1542 static struct platform_driver fimc_md_driver = {
1543         .probe          = fimc_md_probe,
1544         .remove         = fimc_md_remove,
1545         .driver = {
1546                 .of_match_table = of_match_ptr(fimc_md_of_match),
1547                 .name           = "s5p-fimc-md",
1548         }
1549 };
1550
1551 static int __init fimc_md_init(void)
1552 {
1553         int ret;
1554
1555         request_module("s5p-csis");
1556         ret = fimc_register_driver();
1557         if (ret)
1558                 return ret;
1559
1560         return platform_driver_register(&fimc_md_driver);
1561 }
1562
1563 static void __exit fimc_md_exit(void)
1564 {
1565         platform_driver_unregister(&fimc_md_driver);
1566         fimc_unregister_driver();
1567 }
1568
1569 module_init(fimc_md_init);
1570 module_exit(fimc_md_exit);
1571
1572 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1573 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1574 MODULE_LICENSE("GPL");
1575 MODULE_VERSION("2.0.1");