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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * S5P/EXYNOS4 SoC series camera host interface media device driver
   4  *
   5  * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
   6  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
   7  */
   8
   9 #include <linux/bug.h>
  10 #include <linux/clk.h>
  11 #include <linux/clk-provider.h>
  12 #include <linux/device.h>
  13 #include <linux/errno.h>
  14 #include <linux/i2c.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_graph.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/types.h>
  26 #include <linux/slab.h>
  27 #include <media/v4l2-async.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-fwnode.h>
  30 #include <media/media-device.h>
  31 #include <media/drv-intf/exynos-fimc.h>
  32
  33 #include "media-dev.h"
  34 #include "fimc-core.h"
  35 #include "fimc-is.h"
  36 #include "fimc-lite.h"
  37 #include "mipi-csis.h"
  38
  39 /* Set up image sensor subdev -> FIMC capture node notifications. */
  40 static void __setup_sensor_notification(struct fimc_md *fmd,
  41                                         struct v4l2_subdev *sensor,
  42                                         struct v4l2_subdev *fimc_sd)
  43 {
  44         struct fimc_source_info *src_inf;
  45         struct fimc_sensor_info *md_si;
  46         unsigned long flags;
  47
  48         src_inf = v4l2_get_subdev_hostdata(sensor);
  49         if (!src_inf || WARN_ON(fmd == NULL))
  50                 return;
  51
  52         md_si = source_to_sensor_info(src_inf);
  53         spin_lock_irqsave(&fmd->slock, flags);
  54         md_si->host = v4l2_get_subdevdata(fimc_sd);
  55         spin_unlock_irqrestore(&fmd->slock, flags);
  56 }
  57
  58 /**
  59  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  60  * @p: fimc pipeline
  61  * @me: media entity terminating the pipeline
  62  *
  63  * Caller holds the graph mutex.
  64  */
  65 static void fimc_pipeline_prepare(struct fimc_pipeline *p,
  66                                         struct media_entity *me)
  67 {
  68         struct fimc_md *fmd = entity_to_fimc_mdev(me);
  69         struct v4l2_subdev *sd;
  70         struct v4l2_subdev *sensor = NULL;
  71         int i;
  72
  73         for (i = 0; i < IDX_MAX; i++)
  74                 p->subdevs[i] = NULL;
  75
  76         while (1) {
  77                 struct media_pad *pad = NULL;
  78
  79                 /* Find remote source pad */
  80                 for (i = 0; i < me->num_pads; i++) {
  81                         struct media_pad *spad = &me->pads[i];
  82                         if (!(spad->flags & MEDIA_PAD_FL_SINK))
  83                                 continue;
  84                         pad = media_entity_remote_pad(spad);
  85                         if (pad)
  86                                 break;
  87                 }
  88
  89                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
  90                         break;
  91                 sd = media_entity_to_v4l2_subdev(pad->entity);
  92
  93                 switch (sd->grp_id) {
  94                 case GRP_ID_SENSOR:
  95                         sensor = sd;
  96                         fallthrough;
  97                 case GRP_ID_FIMC_IS_SENSOR:
  98                         p->subdevs[IDX_SENSOR] = sd;
  99                         break;
 100                 case GRP_ID_CSIS:
 101                         p->subdevs[IDX_CSIS] = sd;
 102                         break;
 103                 case GRP_ID_FLITE:
 104                         p->subdevs[IDX_FLITE] = sd;
 105                         break;
 106                 case GRP_ID_FIMC:
 107                         p->subdevs[IDX_FIMC] = sd;
 108                         break;
 109                 case GRP_ID_FIMC_IS:
 110                         p->subdevs[IDX_IS_ISP] = sd;
 111                         break;
 112                 default:
 113                         break;
 114                 }
 115                 me = &sd->entity;
 116                 if (me->num_pads == 1)
 117                         break;
 118         }
 119
 120         if (sensor && p->subdevs[IDX_FIMC])
 121                 __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
 122 }
 123
 124 /**
 125  * __subdev_set_power - change power state of a single subdev
 126  * @sd: subdevice to change power state for
 127  * @on: 1 to enable power or 0 to disable
 128  *
 129  * Return result of s_power subdev operation or -ENXIO if sd argument
 130  * is NULL. Return 0 if the subdevice does not implement s_power.
 131  */
 132 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
 133 {
 134         int *use_count;
 135         int ret;
 136
 137         if (sd == NULL)
 138                 return -ENXIO;
 139
 140         use_count = &sd->entity.use_count;
 141         if (on && (*use_count)++ > 0)
 142                 return 0;
 143         else if (!on && (*use_count == 0 || --(*use_count) > 0))
 144                 return 0;
 145         ret = v4l2_subdev_call(sd, core, s_power, on);
 146
 147         return ret != -ENOIOCTLCMD ? ret : 0;
 148 }
 149
 150 /**
 151  * fimc_pipeline_s_power - change power state of all pipeline subdevs
 152  * @p: fimc device terminating the pipeline
 153  * @on: true to power on, false to power off
 154  *
 155  * Needs to be called with the graph mutex held.
 156  */
 157 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
 158 {
 159         static const u8 seq[2][IDX_MAX - 1] = {
 160                 { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
 161                 { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
 162         };
 163         int i, ret = 0;
 164
 165         if (p->subdevs[IDX_SENSOR] == NULL)
 166                 return -ENXIO;
 167
 168         for (i = 0; i < IDX_MAX - 1; i++) {
 169                 unsigned int idx = seq[on][i];
 170
 171                 ret = __subdev_set_power(p->subdevs[idx], on);
 172
 173
 174                 if (ret < 0 && ret != -ENXIO)
 175                         goto error;
 176         }
 177         return 0;
 178 error:
 179         for (; i >= 0; i--) {
 180                 unsigned int idx = seq[on][i];
 181                 __subdev_set_power(p->subdevs[idx], !on);
 182         }
 183         return ret;
 184 }
 185
 186 /**
 187  * __fimc_pipeline_enable - enable power of all pipeline subdevs
 188  *                          and the sensor clock
 189  * @ep: video pipeline structure
 190  * @fmd: fimc media device
 191  *
 192  * Called with the graph mutex held.
 193  */
 194 static int __fimc_pipeline_enable(struct exynos_media_pipeline *ep,
 195                                   struct fimc_md *fmd)
 196 {
 197         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 198         int ret;
 199
 200         /* Enable PXLASYNC clock if this pipeline includes FIMC-IS */
 201         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
 202                 ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
 203                 if (ret < 0)
 204                         return ret;
 205         }
 206
 207         ret = fimc_pipeline_s_power(p, 1);
 208         if (!ret)
 209                 return 0;
 210
 211         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 212                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 213
 214         return ret;
 215 }
 216
 217 /**
 218  * __fimc_pipeline_open - update the pipeline information, enable power
 219  *                        of all pipeline subdevs and the sensor clock
 220  * @ep: fimc device terminating the pipeline
 221  * @me: media entity to start graph walk with
 222  * @prepare: true to walk the current pipeline and acquire all subdevs
 223  *
 224  * Called with the graph mutex held.
 225  */
 226 static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
 227                                 struct media_entity *me, bool prepare)
 228 {
 229         struct fimc_md *fmd = entity_to_fimc_mdev(me);
 230         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 231         struct v4l2_subdev *sd;
 232
 233         if (WARN_ON(p == NULL || me == NULL))
 234                 return -EINVAL;
 235
 236         if (prepare)
 237                 fimc_pipeline_prepare(p, me);
 238
 239         sd = p->subdevs[IDX_SENSOR];
 240         if (sd == NULL) {
 241                 pr_warn("%s(): No sensor subdev\n", __func__);
 242                 /*
 243                  * Pipeline open cannot fail so as to make it possible
 244                  * for the user space to configure the pipeline.
 245                  */
 246                 return 0;
 247         }
 248
 249         return __fimc_pipeline_enable(ep, fmd);
 250 }
 251
 252 /**
 253  * __fimc_pipeline_close - disable the sensor clock and pipeline power
 254  * @ep: fimc device terminating the pipeline
 255  *
 256  * Disable power of all subdevs and turn the external sensor clock off.
 257  */
 258 static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
 259 {
 260         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 261         struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
 262         struct fimc_md *fmd;
 263         int ret;
 264
 265         if (sd == NULL) {
 266                 pr_warn("%s(): No sensor subdev\n", __func__);
 267                 return 0;
 268         }
 269
 270         ret = fimc_pipeline_s_power(p, 0);
 271
 272         fmd = entity_to_fimc_mdev(&sd->entity);
 273
 274         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 275         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 276                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 277
 278         return ret == -ENXIO ? 0 : ret;
 279 }
 280
 281 /**
 282  * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 283  * @ep: video pipeline structure
 284  * @on: passed as the s_stream() callback argument
 285  */
 286 static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 287 {
 288         static const u8 seq[2][IDX_MAX] = {
 289                 { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
 290                 { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 291         };
 292         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 293         enum fimc_subdev_index sd_id;
 294         int i, ret = 0;
 295
 296         if (p->subdevs[IDX_SENSOR] == NULL) {
 297                 struct fimc_md *fmd;
 298                 struct v4l2_subdev *sd = p->subdevs[IDX_CSIS];
 299
 300                 if (!sd)
 301                         sd = p->subdevs[IDX_FIMC];
 302
 303                 if (!sd) {
 304                         /*
 305                          * If neither CSIS nor FIMC was set up,
 306                          * it's impossible to have any sensors
 307                          */
 308                         return -ENODEV;
 309                 }
 310
 311                 fmd = entity_to_fimc_mdev(&sd->entity);
 312
 313                 if (!fmd->user_subdev_api) {
 314                         /*
 315                          * Sensor must be already discovered if we
 316                          * aren't in the user_subdev_api mode
 317                          */
 318                         return -ENODEV;
 319                 }
 320
 321                 /* Get pipeline sink entity */
 322                 if (p->subdevs[IDX_FIMC])
 323                         sd_id = IDX_FIMC;
 324                 else if (p->subdevs[IDX_IS_ISP])
 325                         sd_id = IDX_IS_ISP;
 326                 else if (p->subdevs[IDX_FLITE])
 327                         sd_id = IDX_FLITE;
 328                 else
 329                         return -ENODEV;
 330
 331                 /*
 332                  * Sensor could have been linked between open and STREAMON -
 333                  * check if this is the case.
 334                  */
 335                 fimc_pipeline_prepare(p, &p->subdevs[sd_id]->entity);
 336
 337                 if (p->subdevs[IDX_SENSOR] == NULL)
 338                         return -ENODEV;
 339
 340                 ret = __fimc_pipeline_enable(ep, fmd);
 341                 if (ret < 0)
 342                         return ret;
 343
 344         }
 345
 346         for (i = 0; i < IDX_MAX; i++) {
 347                 unsigned int idx = seq[on][i];
 348
 349                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
 350
 351                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 352                         goto error;
 353         }
 354
 355         return 0;
 356 error:
 357         fimc_pipeline_s_power(p, !on);
 358         for (; i >= 0; i--) {
 359                 unsigned int idx = seq[on][i];
 360                 v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
 361         }
 362         return ret;
 363 }
 364
 365 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
 366 static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
 367         .open           = __fimc_pipeline_open,
 368         .close          = __fimc_pipeline_close,
 369         .set_stream     = __fimc_pipeline_s_stream,
 370 };
 371
 372 static struct exynos_media_pipeline *fimc_md_pipeline_create(
 373                                                 struct fimc_md *fmd)
 374 {
 375         struct fimc_pipeline *p;
 376
 377         p = kzalloc(sizeof(*p), GFP_KERNEL);
 378         if (!p)
 379                 return NULL;
 380
 381         list_add_tail(&p->list, &fmd->pipelines);
 382
 383         p->ep.ops = &fimc_pipeline_ops;
 384         return &p->ep;
 385 }
 386
 387 static void fimc_md_pipelines_free(struct fimc_md *fmd)
 388 {
 389         while (!list_empty(&fmd->pipelines)) {
 390                 struct fimc_pipeline *p;
 391
 392                 p = list_entry(fmd->pipelines.next, typeof(*p), list);
 393                 list_del(&p->list);
 394                 kfree(p);
 395         }
 396 }
 397
 398 static int fimc_md_parse_one_endpoint(struct fimc_md *fmd,
 399                                    struct device_node *ep)
 400 {
 401         int index = fmd->num_sensors;
 402         struct fimc_source_info *pd = &fmd->sensor[index].pdata;
 403         struct device_node *rem, *np;
 404         struct v4l2_async_subdev *asd;
 405         struct v4l2_fwnode_endpoint endpoint = { .bus_type = 0 };
 406         int ret;
 407
 408         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &endpoint);
 409         if (ret) {
 410                 of_node_put(ep);
 411                 return ret;
 412         }
 413
 414         if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS) {
 415                 of_node_put(ep);
 416                 return -EINVAL;
 417         }
 418
 419         pd->mux_id = (endpoint.base.port - 1) & 0x1;
 420
 421         rem = of_graph_get_remote_port_parent(ep);
 422         if (rem == NULL) {
 423                 v4l2_info(&fmd->v4l2_dev, "Remote device at %pOF not found\n",
 424                                                         ep);
 425                 of_node_put(ep);
 426                 return 0;
 427         }
 428
 429         if (fimc_input_is_parallel(endpoint.base.port)) {
 430                 if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
 431                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
 432                 else
 433                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
 434                 pd->flags = endpoint.bus.parallel.flags;
 435         } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
 436                 /*
 437                  * MIPI CSI-2: only input mux selection and
 438                  * the sensor's clock frequency is needed.
 439                  */
 440                 pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
 441         } else {
 442                 v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %pOF\n",
 443                          endpoint.base.port, rem);
 444         }
 445         /*
 446          * For FIMC-IS handled sensors, that are placed under i2c-isp device
 447          * node, FIMC is connected to the FIMC-IS through its ISP Writeback
 448          * input. Sensors are attached to the FIMC-LITE hostdata interface
 449          * directly or through MIPI-CSIS, depending on the external media bus
 450          * used. This needs to be handled in a more reliable way, not by just
 451          * checking parent's node name.
 452          */
 453         np = of_get_parent(rem);
 454         of_node_put(rem);
 455
 456         if (of_node_name_eq(np, "i2c-isp"))
 457                 pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
 458         else
 459                 pd->fimc_bus_type = pd->sensor_bus_type;
 460         of_node_put(np);
 461
 462         if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor))) {
 463                 of_node_put(ep);
 464                 return -EINVAL;
 465         }
 466
 467         asd = v4l2_async_notifier_add_fwnode_remote_subdev(
 468                 &fmd->subdev_notifier, of_fwnode_handle(ep),
 469                 struct v4l2_async_subdev);
 470
 471         of_node_put(ep);
 472
 473         if (IS_ERR(asd))
 474                 return PTR_ERR(asd);
 475
 476         fmd->sensor[index].asd = asd;
 477         fmd->num_sensors++;
 478
 479         return 0;
 480 }
 481
 482 /* Parse port node and register as a sub-device any sensor specified there. */
 483 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 484                                    struct device_node *port)
 485 {
 486         struct device_node *ep;
 487         int ret;
 488
 489         for_each_child_of_node(port, ep) {
 490                 ret = fimc_md_parse_one_endpoint(fmd, ep);
 491                 if (ret < 0)
 492                         return ret;
 493         }
 494
 495         return 0;
 496 }
 497
 498 /* Register all SoC external sub-devices */
 499 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 500 {
 501         struct device_node *parent = fmd->pdev->dev.of_node;
 502         struct device_node *ports = NULL;
 503         struct device_node *node;
 504         int ret;
 505
 506         /*
 507          * Runtime resume one of the FIMC entities to make sure
 508          * the sclk_cam clocks are not globally disabled.
 509          */
 510         if (!fmd->pmf)
 511                 return -ENXIO;
 512
 513         ret = pm_runtime_get_sync(fmd->pmf);
 514         if (ret < 0) {
 515                 pm_runtime_put(fmd->pmf);
 516                 return ret;
 517         }
 518
 519         fmd->num_sensors = 0;
 520
 521         /* Attach sensors linked to MIPI CSI-2 receivers */
 522         for_each_available_child_of_node(parent, node) {
 523                 struct device_node *port;
 524
 525                 if (!of_node_name_eq(node, "csis"))
 526                         continue;
 527                 /* The csis node can have only port subnode. */
 528                 port = of_get_next_child(node, NULL);
 529                 if (!port)
 530                         continue;
 531
 532                 ret = fimc_md_parse_port_node(fmd, port);
 533                 of_node_put(port);
 534                 if (ret < 0) {
 535                         of_node_put(node);
 536                         goto cleanup;
 537                 }
 538         }
 539
 540         /* Attach sensors listed in the parallel-ports node */
 541         ports = of_get_child_by_name(parent, "parallel-ports");
 542         if (!ports)
 543                 goto rpm_put;
 544
 545         for_each_child_of_node(ports, node) {
 546                 ret = fimc_md_parse_port_node(fmd, node);
 547                 if (ret < 0) {
 548                         of_node_put(node);
 549                         goto cleanup;
 550                 }
 551         }
 552         of_node_put(ports);
 553
 554 rpm_put:
 555         pm_runtime_put(fmd->pmf);
 556         return 0;
 557
 558 cleanup:
 559         of_node_put(ports);
 560         v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
 561         pm_runtime_put(fmd->pmf);
 562         return ret;
 563 }
 564
 565 static int __of_get_csis_id(struct device_node *np)
 566 {
 567         u32 reg = 0;
 568
 569         np = of_get_child_by_name(np, "port");
 570         if (!np)
 571                 return -EINVAL;
 572         of_property_read_u32(np, "reg", &reg);
 573         of_node_put(np);
 574         return reg - FIMC_INPUT_MIPI_CSI2_0;
 575 }
 576
 577 /*
 578  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 579  */
 580 static int register_fimc_lite_entity(struct fimc_md *fmd,
 581                                      struct fimc_lite *fimc_lite)
 582 {
 583         struct v4l2_subdev *sd;
 584         struct exynos_media_pipeline *ep;
 585         int ret;
 586
 587         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 588                     fmd->fimc_lite[fimc_lite->index]))
 589                 return -EBUSY;
 590
 591         sd = &fimc_lite->subdev;
 592         sd->grp_id = GRP_ID_FLITE;
 593
 594         ep = fimc_md_pipeline_create(fmd);
 595         if (!ep)
 596                 return -ENOMEM;
 597
 598         v4l2_set_subdev_hostdata(sd, ep);
 599
 600         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 601         if (!ret)
 602                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 603         else
 604                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 605                          fimc_lite->index);
 606         return ret;
 607 }
 608
 609 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 610 {
 611         struct v4l2_subdev *sd;
 612         struct exynos_media_pipeline *ep;
 613         int ret;
 614
 615         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 616                 return -EBUSY;
 617
 618         sd = &fimc->vid_cap.subdev;
 619         sd->grp_id = GRP_ID_FIMC;
 620
 621         ep = fimc_md_pipeline_create(fmd);
 622         if (!ep)
 623                 return -ENOMEM;
 624
 625         v4l2_set_subdev_hostdata(sd, ep);
 626
 627         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 628         if (!ret) {
 629                 if (!fmd->pmf && fimc->pdev)
 630                         fmd->pmf = &fimc->pdev->dev;
 631                 fmd->fimc[fimc->id] = fimc;
 632                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 633         } else {
 634                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 635                          fimc->id, ret);
 636         }
 637         return ret;
 638 }
 639
 640 static int register_csis_entity(struct fimc_md *fmd,
 641                                 struct platform_device *pdev,
 642                                 struct v4l2_subdev *sd)
 643 {
 644         struct device_node *node = pdev->dev.of_node;
 645         int id, ret;
 646
 647         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 648
 649         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 650                 return -ENOENT;
 651
 652         if (WARN_ON(fmd->csis[id].sd))
 653                 return -EBUSY;
 654
 655         sd->grp_id = GRP_ID_CSIS;
 656         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 657         if (!ret)
 658                 fmd->csis[id].sd = sd;
 659         else
 660                 v4l2_err(&fmd->v4l2_dev,
 661                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 662         return ret;
 663 }
 664
 665 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 666 {
 667         struct v4l2_subdev *sd = &is->isp.subdev;
 668         struct exynos_media_pipeline *ep;
 669         int ret;
 670
 671         /* Allocate pipeline object for the ISP capture video node. */
 672         ep = fimc_md_pipeline_create(fmd);
 673         if (!ep)
 674                 return -ENOMEM;
 675
 676         v4l2_set_subdev_hostdata(sd, ep);
 677
 678         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 679         if (ret) {
 680                 v4l2_err(&fmd->v4l2_dev,
 681                          "Failed to register FIMC-ISP (%d)\n", ret);
 682                 return ret;
 683         }
 684
 685         fmd->fimc_is = is;
 686         return 0;
 687 }
 688
 689 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 690                                             struct platform_device *pdev,
 691                                             int plat_entity)
 692 {
 693         struct device *dev = &pdev->dev;
 694         int ret = -EPROBE_DEFER;
 695         void *drvdata;
 696
 697         /* Lock to ensure dev->driver won't change. */
 698         device_lock(dev);
 699
 700         if (!dev->driver || !try_module_get(dev->driver->owner))
 701                 goto dev_unlock;
 702
 703         drvdata = dev_get_drvdata(dev);
 704         /* Some subdev didn't probe successfully id drvdata is NULL */
 705         if (drvdata) {
 706                 switch (plat_entity) {
 707                 case IDX_FIMC:
 708                         ret = register_fimc_entity(fmd, drvdata);
 709                         break;
 710                 case IDX_FLITE:
 711                         ret = register_fimc_lite_entity(fmd, drvdata);
 712                         break;
 713                 case IDX_CSIS:
 714                         ret = register_csis_entity(fmd, pdev, drvdata);
 715                         break;
 716                 case IDX_IS_ISP:
 717                         ret = register_fimc_is_entity(fmd, drvdata);
 718                         break;
 719                 default:
 720                         ret = -ENODEV;
 721                 }
 722         }
 723
 724         module_put(dev->driver->owner);
 725 dev_unlock:
 726         device_unlock(dev);
 727         if (ret == -EPROBE_DEFER)
 728                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 729                         dev_name(dev));
 730         else if (ret < 0)
 731                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 732                         dev_name(dev), ret);
 733         return ret;
 734 }
 735
 736 /* Register FIMC, FIMC-LITE and CSIS media entities */
 737 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 738                                               struct device_node *parent)
 739 {
 740         struct device_node *node;
 741         int ret = 0;
 742
 743         for_each_available_child_of_node(parent, node) {
 744                 struct platform_device *pdev;
 745                 int plat_entity = -1;
 746
 747                 pdev = of_find_device_by_node(node);
 748                 if (!pdev)
 749                         continue;
 750
 751                 /* If driver of any entity isn't ready try all again later. */
 752                 if (of_node_name_eq(node, CSIS_OF_NODE_NAME))
 753                         plat_entity = IDX_CSIS;
 754                 else if (of_node_name_eq(node, FIMC_IS_OF_NODE_NAME))
 755                         plat_entity = IDX_IS_ISP;
 756                 else if (of_node_name_eq(node, FIMC_LITE_OF_NODE_NAME))
 757                         plat_entity = IDX_FLITE;
 758                 else if (of_node_name_eq(node, FIMC_OF_NODE_NAME) &&
 759                          !of_property_read_bool(node, "samsung,lcd-wb"))
 760                         plat_entity = IDX_FIMC;
 761
 762                 if (plat_entity >= 0)
 763                         ret = fimc_md_register_platform_entity(fmd, pdev,
 764                                                         plat_entity);
 765                 put_device(&pdev->dev);
 766                 if (ret < 0) {
 767                         of_node_put(node);
 768                         break;
 769                 }
 770         }
 771
 772         return ret;
 773 }
 774
 775 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 776 {
 777         int i;
 778
 779         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 780                 struct fimc_dev *dev = fmd->fimc[i];
 781                 if (dev == NULL)
 782                         continue;
 783                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 784                 dev->vid_cap.ve.pipe = NULL;
 785                 fmd->fimc[i] = NULL;
 786         }
 787         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 788                 struct fimc_lite *dev = fmd->fimc_lite[i];
 789                 if (dev == NULL)
 790                         continue;
 791                 v4l2_device_unregister_subdev(&dev->subdev);
 792                 dev->ve.pipe = NULL;
 793                 fmd->fimc_lite[i] = NULL;
 794         }
 795         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 796                 if (fmd->csis[i].sd == NULL)
 797                         continue;
 798                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 799                 fmd->csis[i].sd = NULL;
 800         }
 801
 802         if (fmd->fimc_is)
 803                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 804
 805         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 806 }
 807
 808 /**
 809  * __fimc_md_create_fimc_sink_links - create links to all FIMC entities
 810  * @fmd: fimc media device
 811  * @source: the source entity to create links to all fimc entities from
 812  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 813  * @pad: the source entity pad index
 814  * @link_mask: bitmask of the fimc devices for which link should be enabled
 815  */
 816 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 817                                             struct media_entity *source,
 818                                             struct v4l2_subdev *sensor,
 819                                             int pad, int link_mask)
 820 {
 821         struct fimc_source_info *si = NULL;
 822         struct media_entity *sink;
 823         unsigned int flags = 0;
 824         int i, ret = 0;
 825
 826         if (sensor) {
 827                 si = v4l2_get_subdev_hostdata(sensor);
 828                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 829                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 830                         ret = 1;
 831         }
 832
 833         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 834                 if (!fmd->fimc[i])
 835                         continue;
 836                 /*
 837                  * Some FIMC variants are not fitted with camera capture
 838                  * interface. Skip creating a link from sensor for those.
 839                  */
 840                 if (!fmd->fimc[i]->variant->has_cam_if)
 841                         continue;
 842
 843                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 844
 845                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 846                 ret = media_create_pad_link(source, pad, sink,
 847                                               FIMC_SD_PAD_SINK_CAM, flags);
 848                 if (ret)
 849                         return ret;
 850
 851                 /* Notify FIMC capture subdev entity */
 852                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 853                                         &source->pads[pad], flags);
 854                 if (ret)
 855                         break;
 856
 857                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 858                           source->name, flags ? '=' : '-', sink->name);
 859         }
 860
 861         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 862                 if (!fmd->fimc_lite[i])
 863                         continue;
 864
 865                 sink = &fmd->fimc_lite[i]->subdev.entity;
 866                 ret = media_create_pad_link(source, pad, sink,
 867                                                FLITE_SD_PAD_SINK, 0);
 868                 if (ret)
 869                         return ret;
 870
 871                 /* Notify FIMC-LITE subdev entity */
 872                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 873                                         &source->pads[pad], 0);
 874                 if (ret)
 875                         break;
 876
 877                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 878                           source->name, sink->name);
 879         }
 880         return 0;
 881 }
 882
 883 /* Create links from FIMC-LITE source pads to other entities */
 884 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 885 {
 886         struct media_entity *source, *sink;
 887         int i, ret = 0;
 888
 889         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 890                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 891
 892                 if (fimc == NULL)
 893                         continue;
 894
 895                 source = &fimc->subdev.entity;
 896                 sink = &fimc->ve.vdev.entity;
 897                 /* FIMC-LITE's subdev and video node */
 898                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
 899                                                sink, 0, 0);
 900                 if (ret)
 901                         break;
 902                 /* Link from FIMC-LITE to IS-ISP subdev */
 903                 sink = &fmd->fimc_is->isp.subdev.entity;
 904                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
 905                                                sink, 0, 0);
 906                 if (ret)
 907                         break;
 908         }
 909
 910         return ret;
 911 }
 912
 913 /* Create FIMC-IS links */
 914 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 915 {
 916         struct fimc_isp *isp = &fmd->fimc_is->isp;
 917         struct media_entity *source, *sink;
 918         int i, ret;
 919
 920         source = &isp->subdev.entity;
 921
 922         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 923                 if (fmd->fimc[i] == NULL)
 924                         continue;
 925
 926                 /* Link from FIMC-IS-ISP subdev to FIMC */
 927                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 928                 ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 929                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 930                 if (ret)
 931                         return ret;
 932         }
 933
 934         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 935         sink = &isp->video_capture.ve.vdev.entity;
 936
 937         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 938         if (sink->num_pads == 0)
 939                 return 0;
 940
 941         return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 942                                         sink, 0, 0);
 943 }
 944
 945 /**
 946  * fimc_md_create_links - create default links between registered entities
 947  * @fmd: fimc media device
 948  *
 949  * Parallel interface sensor entities are connected directly to FIMC capture
 950  * entities. The sensors using MIPI CSIS bus are connected through immutable
 951  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 952  * entity has a link to each registered FIMC capture entity. Enabled links
 953  * are created by default between each subsequent registered sensor and
 954  * subsequent FIMC capture entity. The number of default active links is
 955  * determined by the number of available sensors or FIMC entities,
 956  * whichever is less.
 957  */
 958 static int fimc_md_create_links(struct fimc_md *fmd)
 959 {
 960         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 961         struct v4l2_subdev *sensor, *csis;
 962         struct fimc_source_info *pdata;
 963         struct media_entity *source, *sink;
 964         int i, pad, fimc_id = 0, ret = 0;
 965         u32 flags, link_mask = 0;
 966
 967         for (i = 0; i < fmd->num_sensors; i++) {
 968                 if (fmd->sensor[i].subdev == NULL)
 969                         continue;
 970
 971                 sensor = fmd->sensor[i].subdev;
 972                 pdata = v4l2_get_subdev_hostdata(sensor);
 973                 if (!pdata)
 974                         continue;
 975
 976                 source = NULL;
 977
 978                 switch (pdata->sensor_bus_type) {
 979                 case FIMC_BUS_TYPE_MIPI_CSI2:
 980                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 981                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 982                                 return -EINVAL;
 983
 984                         csis = fmd->csis[pdata->mux_id].sd;
 985                         if (WARN(csis == NULL,
 986                                  "MIPI-CSI interface specified but s5p-csis module is not loaded!\n"))
 987                                 return -EINVAL;
 988
 989                         pad = sensor->entity.num_pads - 1;
 990                         ret = media_create_pad_link(&sensor->entity, pad,
 991                                               &csis->entity, CSIS_PAD_SINK,
 992                                               MEDIA_LNK_FL_IMMUTABLE |
 993                                               MEDIA_LNK_FL_ENABLED);
 994                         if (ret)
 995                                 return ret;
 996
 997                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 998                                   sensor->entity.name, csis->entity.name);
 999
1000                         source = NULL;
1001                         csi_sensors[pdata->mux_id] = sensor;
1002                         break;
1003
1004                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
1005                         source = &sensor->entity;
1006                         pad = 0;
1007                         break;
1008
1009                 default:
1010                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
1011                                  pdata->sensor_bus_type);
1012                         return -EINVAL;
1013                 }
1014                 if (source == NULL)
1015                         continue;
1016
1017                 link_mask = 1 << fimc_id++;
1018                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
1019                                                        pad, link_mask);
1020         }
1021
1022         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
1023                 if (fmd->csis[i].sd == NULL)
1024                         continue;
1025
1026                 source = &fmd->csis[i].sd->entity;
1027                 pad = CSIS_PAD_SOURCE;
1028                 sensor = csi_sensors[i];
1029
1030                 link_mask = 1 << fimc_id++;
1031                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
1032                                                        pad, link_mask);
1033         }
1034
1035         /* Create immutable links between each FIMC's subdev and video node */
1036         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
1037         for (i = 0; i < FIMC_MAX_DEVS; i++) {
1038                 if (!fmd->fimc[i])
1039                         continue;
1040
1041                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
1042                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
1043
1044                 ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
1045                                               sink, 0, flags);
1046                 if (ret)
1047                         break;
1048         }
1049
1050         ret = __fimc_md_create_flite_source_links(fmd);
1051         if (ret < 0)
1052                 return ret;
1053
1054         if (fmd->use_isp)
1055                 ret = __fimc_md_create_fimc_is_links(fmd);
1056
1057         return ret;
1058 }
1059
1060 /*
1061  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
1062  */
1063 static void fimc_md_put_clocks(struct fimc_md *fmd)
1064 {
1065         int i = FIMC_MAX_CAMCLKS;
1066
1067         while (--i >= 0) {
1068                 if (IS_ERR(fmd->camclk[i].clock))
1069                         continue;
1070                 clk_put(fmd->camclk[i].clock);
1071                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1072         }
1073
1074         /* Writeback (PIXELASYNCMx) clocks */
1075         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
1076                 if (IS_ERR(fmd->wbclk[i]))
1077                         continue;
1078                 clk_put(fmd->wbclk[i]);
1079                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
1080         }
1081 }
1082
1083 static int fimc_md_get_clocks(struct fimc_md *fmd)
1084 {
1085         struct device *dev = &fmd->pdev->dev;
1086         char clk_name[32];
1087         struct clk *clock;
1088         int i, ret = 0;
1089
1090         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
1091                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1092
1093         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1094                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
1095                 clock = clk_get(dev, clk_name);
1096
1097                 if (IS_ERR(clock)) {
1098                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
1099                         ret = PTR_ERR(clock);
1100                         break;
1101                 }
1102                 fmd->camclk[i].clock = clock;
1103         }
1104         if (ret)
1105                 fimc_md_put_clocks(fmd);
1106
1107         if (!fmd->use_isp)
1108                 return 0;
1109         /*
1110          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
1111          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1112          */
1113         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1114
1115         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1116                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1117                 clock = clk_get(dev, clk_name);
1118                 if (IS_ERR(clock)) {
1119                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1120                                   clk_name);
1121                         ret = PTR_ERR(clock);
1122                         break;
1123                 }
1124                 fmd->wbclk[i] = clock;
1125         }
1126         if (ret)
1127                 fimc_md_put_clocks(fmd);
1128
1129         return ret;
1130 }
1131
1132 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1133 {
1134         struct exynos_video_entity *ve;
1135         struct fimc_pipeline *p;
1136         struct video_device *vdev;
1137         int ret;
1138
1139         vdev = media_entity_to_video_device(entity);
1140         if (vdev->entity.use_count == 0)
1141                 return 0;
1142
1143         ve = vdev_to_exynos_video_entity(vdev);
1144         p = to_fimc_pipeline(ve->pipe);
1145         /*
1146          * Nothing to do if we are disabling the pipeline, some link
1147          * has been disconnected and p->subdevs array is cleared now.
1148          */
1149         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1150                 return 0;
1151
1152         if (enable)
1153                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1154         else
1155                 ret = __fimc_pipeline_close(ve->pipe);
1156
1157         if (ret == 0 && !enable)
1158                 memset(p->subdevs, 0, sizeof(p->subdevs));
1159
1160         return ret;
1161 }
1162
1163 /* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
1164 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
1165                                       struct media_graph *graph)
1166 {
1167         struct media_entity *entity_err = entity;
1168         int ret;
1169
1170         /*
1171          * Walk current graph and call the pipeline open/close routine for each
1172          * opened video node that belongs to the graph of entities connected
1173          * through active links. This is needed as we cannot power on/off the
1174          * subdevs in random order.
1175          */
1176         media_graph_walk_start(graph, entity);
1177
1178         while ((entity = media_graph_walk_next(graph))) {
1179                 if (!is_media_entity_v4l2_video_device(entity))
1180                         continue;
1181
1182                 ret  = __fimc_md_modify_pipeline(entity, enable);
1183
1184                 if (ret < 0)
1185                         goto err;
1186         }
1187
1188         return 0;
1189
1190 err:
1191         media_graph_walk_start(graph, entity_err);
1192
1193         while ((entity_err = media_graph_walk_next(graph))) {
1194                 if (!is_media_entity_v4l2_video_device(entity_err))
1195                         continue;
1196
1197                 __fimc_md_modify_pipeline(entity_err, !enable);
1198
1199                 if (entity_err == entity)
1200                         break;
1201         }
1202
1203         return ret;
1204 }
1205
1206 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1207                                 unsigned int notification)
1208 {
1209         struct media_graph *graph =
1210                 &container_of(link->graph_obj.mdev, struct fimc_md,
1211                               media_dev)->link_setup_graph;
1212         struct media_entity *sink = link->sink->entity;
1213         int ret = 0;
1214
1215         /* Before link disconnection */
1216         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1217                 ret = media_graph_walk_init(graph,
1218                                                    link->graph_obj.mdev);
1219                 if (ret)
1220                         return ret;
1221                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1222                         ret = __fimc_md_modify_pipelines(sink, false, graph);
1223 #if 0
1224                 else
1225                         /* TODO: Link state change validation */
1226 #endif
1227         /* After link activation */
1228         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
1229                 if (link->flags & MEDIA_LNK_FL_ENABLED)
1230                         ret = __fimc_md_modify_pipelines(sink, true, graph);
1231                 media_graph_walk_cleanup(graph);
1232         }
1233
1234         return ret ? -EPIPE : 0;
1235 }
1236
1237 static const struct media_device_ops fimc_md_ops = {
1238         .link_notify = fimc_md_link_notify,
1239 };
1240
1241 static ssize_t fimc_md_sysfs_show(struct device *dev,
1242                                   struct device_attribute *attr, char *buf)
1243 {
1244         struct fimc_md *fmd = dev_get_drvdata(dev);
1245
1246         if (fmd->user_subdev_api)
1247                 return strscpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1248
1249         return strscpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1250 }
1251
1252 static ssize_t fimc_md_sysfs_store(struct device *dev,
1253                                    struct device_attribute *attr,
1254                                    const char *buf, size_t count)
1255 {
1256         struct fimc_md *fmd = dev_get_drvdata(dev);
1257         bool subdev_api;
1258         int i;
1259
1260         if (!strcmp(buf, "vid-dev\n"))
1261                 subdev_api = false;
1262         else if (!strcmp(buf, "sub-dev\n"))
1263                 subdev_api = true;
1264         else
1265                 return count;
1266
1267         fmd->user_subdev_api = subdev_api;
1268         for (i = 0; i < FIMC_MAX_DEVS; i++)
1269                 if (fmd->fimc[i])
1270                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1271         return count;
1272 }
1273 /*
1274  * This device attribute is to select video pipeline configuration method.
1275  * There are following valid values:
1276  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1277  *  by the host driver.
1278  *  sub-dev - for media controller API, subdevs must be configured in user
1279  *  space before starting streaming.
1280  */
1281 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1282                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1283
1284 static int cam_clk_prepare(struct clk_hw *hw)
1285 {
1286         struct cam_clk *camclk = to_cam_clk(hw);
1287         int ret;
1288
1289         if (camclk->fmd->pmf == NULL)
1290                 return -ENODEV;
1291
1292         ret = pm_runtime_get_sync(camclk->fmd->pmf);
1293         return ret < 0 ? ret : 0;
1294 }
1295
1296 static void cam_clk_unprepare(struct clk_hw *hw)
1297 {
1298         struct cam_clk *camclk = to_cam_clk(hw);
1299
1300         if (camclk->fmd->pmf == NULL)
1301                 return;
1302
1303         pm_runtime_put_sync(camclk->fmd->pmf);
1304 }
1305
1306 static const struct clk_ops cam_clk_ops = {
1307         .prepare = cam_clk_prepare,
1308         .unprepare = cam_clk_unprepare,
1309 };
1310
1311 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1312 {
1313         struct cam_clk_provider *cp = &fmd->clk_provider;
1314         unsigned int i;
1315
1316         if (cp->of_node)
1317                 of_clk_del_provider(cp->of_node);
1318
1319         for (i = 0; i < cp->num_clocks; i++)
1320                 clk_unregister(cp->clks[i]);
1321 }
1322
1323 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1324 {
1325         struct cam_clk_provider *cp = &fmd->clk_provider;
1326         struct device *dev = &fmd->pdev->dev;
1327         int i, ret;
1328
1329         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1330                 struct cam_clk *camclk = &cp->camclk[i];
1331                 struct clk_init_data init;
1332                 const char *p_name;
1333
1334                 ret = of_property_read_string_index(dev->of_node,
1335                                         "clock-output-names", i, &init.name);
1336                 if (ret < 0)
1337                         break;
1338
1339                 p_name = __clk_get_name(fmd->camclk[i].clock);
1340
1341                 /* It's safe since clk_register() will duplicate the string. */
1342                 init.parent_names = &p_name;
1343                 init.num_parents = 1;
1344                 init.ops = &cam_clk_ops;
1345                 init.flags = CLK_SET_RATE_PARENT;
1346                 camclk->hw.init = &init;
1347                 camclk->fmd = fmd;
1348
1349                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1350                 if (IS_ERR(cp->clks[i])) {
1351                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1352                                         init.name, PTR_ERR(cp->clks[i]));
1353                         ret = PTR_ERR(cp->clks[i]);
1354                         goto err;
1355                 }
1356                 cp->num_clocks++;
1357         }
1358
1359         if (cp->num_clocks == 0) {
1360                 dev_warn(dev, "clk provider not registered\n");
1361                 return 0;
1362         }
1363
1364         cp->clk_data.clks = cp->clks;
1365         cp->clk_data.clk_num = cp->num_clocks;
1366         cp->of_node = dev->of_node;
1367         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1368                                   &cp->clk_data);
1369         if (ret == 0)
1370                 return 0;
1371 err:
1372         fimc_md_unregister_clk_provider(fmd);
1373         return ret;
1374 }
1375
1376 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1377                                  struct v4l2_subdev *subdev,
1378                                  struct v4l2_async_subdev *asd)
1379 {
1380         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1381         struct fimc_sensor_info *si = NULL;
1382         int i;
1383
1384         /* Find platform data for this sensor subdev */
1385         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1386                 if (fmd->sensor[i].asd &&
1387                     fmd->sensor[i].asd->match.fwnode ==
1388                     of_fwnode_handle(subdev->dev->of_node))
1389                         si = &fmd->sensor[i];
1390
1391         if (si == NULL)
1392                 return -EINVAL;
1393
1394         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1395
1396         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1397                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1398         else
1399                 subdev->grp_id = GRP_ID_SENSOR;
1400
1401         si->subdev = subdev;
1402
1403         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1404                   subdev->name, fmd->num_sensors);
1405
1406         fmd->num_sensors++;
1407
1408         return 0;
1409 }
1410
1411 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1412 {
1413         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1414         int ret;
1415
1416         mutex_lock(&fmd->media_dev.graph_mutex);
1417
1418         ret = fimc_md_create_links(fmd);
1419         if (ret < 0)
1420                 goto unlock;
1421
1422         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1423 unlock:
1424         mutex_unlock(&fmd->media_dev.graph_mutex);
1425         if (ret < 0)
1426                 return ret;
1427
1428         return media_device_register(&fmd->media_dev);
1429 }
1430
1431 static const struct v4l2_async_notifier_operations subdev_notifier_ops = {
1432         .bound = subdev_notifier_bound,
1433         .complete = subdev_notifier_complete,
1434 };
1435
1436 static int fimc_md_probe(struct platform_device *pdev)
1437 {
1438         struct device *dev = &pdev->dev;
1439         struct v4l2_device *v4l2_dev;
1440         struct pinctrl *pinctrl;
1441         struct fimc_md *fmd;
1442         int ret;
1443
1444         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1445         if (!fmd)
1446                 return -ENOMEM;
1447
1448         spin_lock_init(&fmd->slock);
1449         INIT_LIST_HEAD(&fmd->pipelines);
1450         fmd->pdev = pdev;
1451
1452         strscpy(fmd->media_dev.model, "Samsung S5P FIMC",
1453                 sizeof(fmd->media_dev.model));
1454         fmd->media_dev.ops = &fimc_md_ops;
1455         fmd->media_dev.dev = dev;
1456
1457         v4l2_dev = &fmd->v4l2_dev;
1458         v4l2_dev->mdev = &fmd->media_dev;
1459         v4l2_dev->notify = fimc_sensor_notify;
1460         strscpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1461
1462         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1463         fmd->user_subdev_api = true;
1464
1465         media_device_init(&fmd->media_dev);
1466
1467         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1468         if (ret < 0) {
1469                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1470                 goto err_md;
1471         }
1472
1473         ret = fimc_md_get_clocks(fmd);
1474         if (ret)
1475                 goto err_v4l2dev;
1476
1477         pinctrl = devm_pinctrl_get(dev);
1478         if (IS_ERR(pinctrl)) {
1479                 ret = PTR_ERR(pinctrl);
1480                 if (ret != EPROBE_DEFER)
1481                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1482                 goto err_clk;
1483         }
1484
1485         platform_set_drvdata(pdev, fmd);
1486
1487         v4l2_async_notifier_init(&fmd->subdev_notifier);
1488
1489         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1490         if (ret)
1491                 goto err_clk;
1492
1493         ret = fimc_md_register_sensor_entities(fmd);
1494         if (ret)
1495                 goto err_m_ent;
1496
1497         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1498         if (ret)
1499                 goto err_cleanup;
1500         /*
1501          * FIMC platform devices need to be registered before the sclk_cam
1502          * clocks provider, as one of these devices needs to be activated
1503          * to enable the clock.
1504          */
1505         ret = fimc_md_register_clk_provider(fmd);
1506         if (ret < 0) {
1507                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1508                 goto err_attr;
1509         }
1510
1511         if (fmd->num_sensors > 0) {
1512                 fmd->subdev_notifier.ops = &subdev_notifier_ops;
1513                 fmd->num_sensors = 0;
1514
1515                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1516                                                 &fmd->subdev_notifier);
1517                 if (ret)
1518                         goto err_clk_p;
1519         }
1520
1521         return 0;
1522
1523 err_clk_p:
1524         fimc_md_unregister_clk_provider(fmd);
1525 err_attr:
1526         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1527 err_cleanup:
1528         v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
1529 err_m_ent:
1530         fimc_md_unregister_entities(fmd);
1531 err_clk:
1532         fimc_md_put_clocks(fmd);
1533 err_v4l2dev:
1534         v4l2_device_unregister(&fmd->v4l2_dev);
1535 err_md:
1536         media_device_cleanup(&fmd->media_dev);
1537         return ret;
1538 }
1539
1540 static int fimc_md_remove(struct platform_device *pdev)
1541 {
1542         struct fimc_md *fmd = platform_get_drvdata(pdev);
1543
1544         if (!fmd)
1545                 return 0;
1546
1547         fimc_md_unregister_clk_provider(fmd);
1548         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1549         v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
1550
1551         v4l2_device_unregister(&fmd->v4l2_dev);
1552         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1553         fimc_md_unregister_entities(fmd);
1554         fimc_md_pipelines_free(fmd);
1555         media_device_unregister(&fmd->media_dev);
1556         media_device_cleanup(&fmd->media_dev);
1557         fimc_md_put_clocks(fmd);
1558
1559         return 0;
1560 }
1561
1562 static const struct platform_device_id fimc_driver_ids[] __always_unused = {
1563         { .name = "s5p-fimc-md" },
1564         { },
1565 };
1566 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1567
1568 static const struct of_device_id fimc_md_of_match[] = {
1569         { .compatible = "samsung,fimc" },
1570         { },
1571 };
1572 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1573
1574 static struct platform_driver fimc_md_driver = {
1575         .probe          = fimc_md_probe,
1576         .remove         = fimc_md_remove,
1577         .driver = {
1578                 .of_match_table = of_match_ptr(fimc_md_of_match),
1579                 .name           = "s5p-fimc-md",
1580         }
1581 };
1582
1583 static int __init fimc_md_init(void)
1584 {
1585         int ret;
1586
1587         request_module("s5p-csis");
1588         ret = fimc_register_driver();
1589         if (ret)
1590                 return ret;
1591
1592         return platform_driver_register(&fimc_md_driver);
1593 }
1594
1595 static void __exit fimc_md_exit(void)
1596 {
1597         platform_driver_unregister(&fimc_md_driver);
1598         fimc_unregister_driver();
1599 }
1600
1601 module_init(fimc_md_init);
1602 module_exit(fimc_md_exit);
1603
1604 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1605 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1606 MODULE_LICENSE("GPL");
1607 MODULE_VERSION("2.0.1");