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), sizeof(*asd));
 469
 470         of_node_put(ep);
 471
 472         if (IS_ERR(asd))
 473                 return PTR_ERR(asd);
 474
 475         fmd->sensor[index].asd = asd;
 476         fmd->num_sensors++;
 477
 478         return 0;
 479 }
 480
 481 /* Parse port node and register as a sub-device any sensor specified there. */
 482 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 483                                    struct device_node *port)
 484 {
 485         struct device_node *ep;
 486         int ret;
 487
 488         for_each_child_of_node(port, ep) {
 489                 ret = fimc_md_parse_one_endpoint(fmd, ep);
 490                 if (ret < 0)
 491                         return ret;
 492         }
 493
 494         return 0;
 495 }
 496
 497 /* Register all SoC external sub-devices */
 498 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 499 {
 500         struct device_node *parent = fmd->pdev->dev.of_node;
 501         struct device_node *ports = NULL;
 502         struct device_node *node;
 503         int ret;
 504
 505         /*
 506          * Runtime resume one of the FIMC entities to make sure
 507          * the sclk_cam clocks are not globally disabled.
 508          */
 509         if (!fmd->pmf)
 510                 return -ENXIO;
 511
 512         ret = pm_runtime_resume_and_get(fmd->pmf);
 513         if (ret < 0)
 514                 return ret;
 515
 516         fmd->num_sensors = 0;
 517
 518         /* Attach sensors linked to MIPI CSI-2 receivers */
 519         for_each_available_child_of_node(parent, node) {
 520                 struct device_node *port;
 521
 522                 if (!of_node_name_eq(node, "csis"))
 523                         continue;
 524                 /* The csis node can have only port subnode. */
 525                 port = of_get_next_child(node, NULL);
 526                 if (!port)
 527                         continue;
 528
 529                 ret = fimc_md_parse_port_node(fmd, port);
 530                 of_node_put(port);
 531                 if (ret < 0) {
 532                         of_node_put(node);
 533                         goto cleanup;
 534                 }
 535         }
 536
 537         /* Attach sensors listed in the parallel-ports node */
 538         ports = of_get_child_by_name(parent, "parallel-ports");
 539         if (!ports)
 540                 goto rpm_put;
 541
 542         for_each_child_of_node(ports, node) {
 543                 ret = fimc_md_parse_port_node(fmd, node);
 544                 if (ret < 0) {
 545                         of_node_put(node);
 546                         goto cleanup;
 547                 }
 548         }
 549         of_node_put(ports);
 550
 551 rpm_put:
 552         pm_runtime_put(fmd->pmf);
 553         return 0;
 554
 555 cleanup:
 556         of_node_put(ports);
 557         v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
 558         pm_runtime_put(fmd->pmf);
 559         return ret;
 560 }
 561
 562 static int __of_get_csis_id(struct device_node *np)
 563 {
 564         u32 reg = 0;
 565
 566         np = of_get_child_by_name(np, "port");
 567         if (!np)
 568                 return -EINVAL;
 569         of_property_read_u32(np, "reg", &reg);
 570         of_node_put(np);
 571         return reg - FIMC_INPUT_MIPI_CSI2_0;
 572 }
 573
 574 /*
 575  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 576  */
 577 static int register_fimc_lite_entity(struct fimc_md *fmd,
 578                                      struct fimc_lite *fimc_lite)
 579 {
 580         struct v4l2_subdev *sd;
 581         struct exynos_media_pipeline *ep;
 582         int ret;
 583
 584         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 585                     fmd->fimc_lite[fimc_lite->index]))
 586                 return -EBUSY;
 587
 588         sd = &fimc_lite->subdev;
 589         sd->grp_id = GRP_ID_FLITE;
 590
 591         ep = fimc_md_pipeline_create(fmd);
 592         if (!ep)
 593                 return -ENOMEM;
 594
 595         v4l2_set_subdev_hostdata(sd, ep);
 596
 597         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 598         if (!ret)
 599                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 600         else
 601                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 602                          fimc_lite->index);
 603         return ret;
 604 }
 605
 606 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 607 {
 608         struct v4l2_subdev *sd;
 609         struct exynos_media_pipeline *ep;
 610         int ret;
 611
 612         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 613                 return -EBUSY;
 614
 615         sd = &fimc->vid_cap.subdev;
 616         sd->grp_id = GRP_ID_FIMC;
 617
 618         ep = fimc_md_pipeline_create(fmd);
 619         if (!ep)
 620                 return -ENOMEM;
 621
 622         v4l2_set_subdev_hostdata(sd, ep);
 623
 624         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 625         if (!ret) {
 626                 if (!fmd->pmf && fimc->pdev)
 627                         fmd->pmf = &fimc->pdev->dev;
 628                 fmd->fimc[fimc->id] = fimc;
 629                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 630         } else {
 631                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 632                          fimc->id, ret);
 633         }
 634         return ret;
 635 }
 636
 637 static int register_csis_entity(struct fimc_md *fmd,
 638                                 struct platform_device *pdev,
 639                                 struct v4l2_subdev *sd)
 640 {
 641         struct device_node *node = pdev->dev.of_node;
 642         int id, ret;
 643
 644         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 645
 646         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 647                 return -ENOENT;
 648
 649         if (WARN_ON(fmd->csis[id].sd))
 650                 return -EBUSY;
 651
 652         sd->grp_id = GRP_ID_CSIS;
 653         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 654         if (!ret)
 655                 fmd->csis[id].sd = sd;
 656         else
 657                 v4l2_err(&fmd->v4l2_dev,
 658                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 659         return ret;
 660 }
 661
 662 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 663 {
 664         struct v4l2_subdev *sd = &is->isp.subdev;
 665         struct exynos_media_pipeline *ep;
 666         int ret;
 667
 668         /* Allocate pipeline object for the ISP capture video node. */
 669         ep = fimc_md_pipeline_create(fmd);
 670         if (!ep)
 671                 return -ENOMEM;
 672
 673         v4l2_set_subdev_hostdata(sd, ep);
 674
 675         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 676         if (ret) {
 677                 v4l2_err(&fmd->v4l2_dev,
 678                          "Failed to register FIMC-ISP (%d)\n", ret);
 679                 return ret;
 680         }
 681
 682         fmd->fimc_is = is;
 683         return 0;
 684 }
 685
 686 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 687                                             struct platform_device *pdev,
 688                                             int plat_entity)
 689 {
 690         struct device *dev = &pdev->dev;
 691         int ret = -EPROBE_DEFER;
 692         void *drvdata;
 693
 694         /* Lock to ensure dev->driver won't change. */
 695         device_lock(dev);
 696
 697         if (!dev->driver || !try_module_get(dev->driver->owner))
 698                 goto dev_unlock;
 699
 700         drvdata = dev_get_drvdata(dev);
 701         /* Some subdev didn't probe successfully id drvdata is NULL */
 702         if (drvdata) {
 703                 switch (plat_entity) {
 704                 case IDX_FIMC:
 705                         ret = register_fimc_entity(fmd, drvdata);
 706                         break;
 707                 case IDX_FLITE:
 708                         ret = register_fimc_lite_entity(fmd, drvdata);
 709                         break;
 710                 case IDX_CSIS:
 711                         ret = register_csis_entity(fmd, pdev, drvdata);
 712                         break;
 713                 case IDX_IS_ISP:
 714                         ret = register_fimc_is_entity(fmd, drvdata);
 715                         break;
 716                 default:
 717                         ret = -ENODEV;
 718                 }
 719         }
 720
 721         module_put(dev->driver->owner);
 722 dev_unlock:
 723         device_unlock(dev);
 724         if (ret == -EPROBE_DEFER)
 725                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 726                         dev_name(dev));
 727         else if (ret < 0)
 728                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 729                         dev_name(dev), ret);
 730         return ret;
 731 }
 732
 733 /* Register FIMC, FIMC-LITE and CSIS media entities */
 734 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 735                                               struct device_node *parent)
 736 {
 737         struct device_node *node;
 738         int ret = 0;
 739
 740         for_each_available_child_of_node(parent, node) {
 741                 struct platform_device *pdev;
 742                 int plat_entity = -1;
 743
 744                 pdev = of_find_device_by_node(node);
 745                 if (!pdev)
 746                         continue;
 747
 748                 /* If driver of any entity isn't ready try all again later. */
 749                 if (of_node_name_eq(node, CSIS_OF_NODE_NAME))
 750                         plat_entity = IDX_CSIS;
 751                 else if (of_node_name_eq(node, FIMC_IS_OF_NODE_NAME))
 752                         plat_entity = IDX_IS_ISP;
 753                 else if (of_node_name_eq(node, FIMC_LITE_OF_NODE_NAME))
 754                         plat_entity = IDX_FLITE;
 755                 else if (of_node_name_eq(node, FIMC_OF_NODE_NAME) &&
 756                          !of_property_read_bool(node, "samsung,lcd-wb"))
 757                         plat_entity = IDX_FIMC;
 758
 759                 if (plat_entity >= 0)
 760                         ret = fimc_md_register_platform_entity(fmd, pdev,
 761                                                         plat_entity);
 762                 put_device(&pdev->dev);
 763                 if (ret < 0) {
 764                         of_node_put(node);
 765                         break;
 766                 }
 767         }
 768
 769         return ret;
 770 }
 771
 772 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 773 {
 774         int i;
 775
 776         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 777                 struct fimc_dev *dev = fmd->fimc[i];
 778                 if (dev == NULL)
 779                         continue;
 780                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 781                 dev->vid_cap.ve.pipe = NULL;
 782                 fmd->fimc[i] = NULL;
 783         }
 784         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 785                 struct fimc_lite *dev = fmd->fimc_lite[i];
 786                 if (dev == NULL)
 787                         continue;
 788                 v4l2_device_unregister_subdev(&dev->subdev);
 789                 dev->ve.pipe = NULL;
 790                 fmd->fimc_lite[i] = NULL;
 791         }
 792         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 793                 if (fmd->csis[i].sd == NULL)
 794                         continue;
 795                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 796                 fmd->csis[i].sd = NULL;
 797         }
 798
 799         if (fmd->fimc_is)
 800                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 801
 802         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 803 }
 804
 805 /**
 806  * __fimc_md_create_fimc_links - create links to all FIMC entities
 807  * @fmd: fimc media device
 808  * @source: the source entity to create links to all fimc entities from
 809  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 810  * @pad: the source entity pad index
 811  * @link_mask: bitmask of the fimc devices for which link should be enabled
 812  */
 813 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 814                                             struct media_entity *source,
 815                                             struct v4l2_subdev *sensor,
 816                                             int pad, int link_mask)
 817 {
 818         struct fimc_source_info *si = NULL;
 819         struct media_entity *sink;
 820         unsigned int flags = 0;
 821         int i, ret = 0;
 822
 823         if (sensor) {
 824                 si = v4l2_get_subdev_hostdata(sensor);
 825                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 826                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 827                         ret = 1;
 828         }
 829
 830         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 831                 if (!fmd->fimc[i])
 832                         continue;
 833                 /*
 834                  * Some FIMC variants are not fitted with camera capture
 835                  * interface. Skip creating a link from sensor for those.
 836                  */
 837                 if (!fmd->fimc[i]->variant->has_cam_if)
 838                         continue;
 839
 840                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 841
 842                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 843                 ret = media_create_pad_link(source, pad, sink,
 844                                               FIMC_SD_PAD_SINK_CAM, flags);
 845                 if (ret)
 846                         return ret;
 847
 848                 /* Notify FIMC capture subdev entity */
 849                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 850                                         &source->pads[pad], flags);
 851                 if (ret)
 852                         break;
 853
 854                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 855                           source->name, flags ? '=' : '-', sink->name);
 856         }
 857
 858         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 859                 if (!fmd->fimc_lite[i])
 860                         continue;
 861
 862                 sink = &fmd->fimc_lite[i]->subdev.entity;
 863                 ret = media_create_pad_link(source, pad, sink,
 864                                                FLITE_SD_PAD_SINK, 0);
 865                 if (ret)
 866                         return ret;
 867
 868                 /* Notify FIMC-LITE subdev entity */
 869                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 870                                         &source->pads[pad], 0);
 871                 if (ret)
 872                         break;
 873
 874                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 875                           source->name, sink->name);
 876         }
 877         return 0;
 878 }
 879
 880 /* Create links from FIMC-LITE source pads to other entities */
 881 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 882 {
 883         struct media_entity *source, *sink;
 884         int i, ret = 0;
 885
 886         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 887                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 888
 889                 if (fimc == NULL)
 890                         continue;
 891
 892                 source = &fimc->subdev.entity;
 893                 sink = &fimc->ve.vdev.entity;
 894                 /* FIMC-LITE's subdev and video node */
 895                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
 896                                                sink, 0, 0);
 897                 if (ret)
 898                         break;
 899                 /* Link from FIMC-LITE to IS-ISP subdev */
 900                 sink = &fmd->fimc_is->isp.subdev.entity;
 901                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
 902                                                sink, 0, 0);
 903                 if (ret)
 904                         break;
 905         }
 906
 907         return ret;
 908 }
 909
 910 /* Create FIMC-IS links */
 911 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 912 {
 913         struct fimc_isp *isp = &fmd->fimc_is->isp;
 914         struct media_entity *source, *sink;
 915         int i, ret;
 916
 917         source = &isp->subdev.entity;
 918
 919         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 920                 if (fmd->fimc[i] == NULL)
 921                         continue;
 922
 923                 /* Link from FIMC-IS-ISP subdev to FIMC */
 924                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 925                 ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 926                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 927                 if (ret)
 928                         return ret;
 929         }
 930
 931         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 932         sink = &isp->video_capture.ve.vdev.entity;
 933
 934         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 935         if (sink->num_pads == 0)
 936                 return 0;
 937
 938         return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 939                                         sink, 0, 0);
 940 }
 941
 942 /**
 943  * fimc_md_create_links - create default links between registered entities
 944  * @fmd: fimc media device
 945  *
 946  * Parallel interface sensor entities are connected directly to FIMC capture
 947  * entities. The sensors using MIPI CSIS bus are connected through immutable
 948  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 949  * entity has a link to each registered FIMC capture entity. Enabled links
 950  * are created by default between each subsequent registered sensor and
 951  * subsequent FIMC capture entity. The number of default active links is
 952  * determined by the number of available sensors or FIMC entities,
 953  * whichever is less.
 954  */
 955 static int fimc_md_create_links(struct fimc_md *fmd)
 956 {
 957         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 958         struct v4l2_subdev *sensor, *csis;
 959         struct fimc_source_info *pdata;
 960         struct media_entity *source, *sink;
 961         int i, pad, fimc_id = 0, ret = 0;
 962         u32 flags, link_mask = 0;
 963
 964         for (i = 0; i < fmd->num_sensors; i++) {
 965                 if (fmd->sensor[i].subdev == NULL)
 966                         continue;
 967
 968                 sensor = fmd->sensor[i].subdev;
 969                 pdata = v4l2_get_subdev_hostdata(sensor);
 970                 if (!pdata)
 971                         continue;
 972
 973                 source = NULL;
 974
 975                 switch (pdata->sensor_bus_type) {
 976                 case FIMC_BUS_TYPE_MIPI_CSI2:
 977                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 978                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 979                                 return -EINVAL;
 980
 981                         csis = fmd->csis[pdata->mux_id].sd;
 982                         if (WARN(csis == NULL,
 983                                  "MIPI-CSI interface specified but s5p-csis module is not loaded!\n"))
 984                                 return -EINVAL;
 985
 986                         pad = sensor->entity.num_pads - 1;
 987                         ret = media_create_pad_link(&sensor->entity, pad,
 988                                               &csis->entity, CSIS_PAD_SINK,
 989                                               MEDIA_LNK_FL_IMMUTABLE |
 990                                               MEDIA_LNK_FL_ENABLED);
 991                         if (ret)
 992                                 return ret;
 993
 994                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 995                                   sensor->entity.name, csis->entity.name);
 996
 997                         source = NULL;
 998                         csi_sensors[pdata->mux_id] = sensor;
 999                         break;
1000
1001                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
1002                         source = &sensor->entity;
1003                         pad = 0;
1004                         break;
1005
1006                 default:
1007                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
1008                                  pdata->sensor_bus_type);
1009                         return -EINVAL;
1010                 }
1011                 if (source == NULL)
1012                         continue;
1013
1014                 link_mask = 1 << fimc_id++;
1015                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
1016                                                        pad, link_mask);
1017         }
1018
1019         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
1020                 if (fmd->csis[i].sd == NULL)
1021                         continue;
1022
1023                 source = &fmd->csis[i].sd->entity;
1024                 pad = CSIS_PAD_SOURCE;
1025                 sensor = csi_sensors[i];
1026
1027                 link_mask = 1 << fimc_id++;
1028                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
1029                                                        pad, link_mask);
1030         }
1031
1032         /* Create immutable links between each FIMC's subdev and video node */
1033         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
1034         for (i = 0; i < FIMC_MAX_DEVS; i++) {
1035                 if (!fmd->fimc[i])
1036                         continue;
1037
1038                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
1039                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
1040
1041                 ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
1042                                               sink, 0, flags);
1043                 if (ret)
1044                         break;
1045         }
1046
1047         ret = __fimc_md_create_flite_source_links(fmd);
1048         if (ret < 0)
1049                 return ret;
1050
1051         if (fmd->use_isp)
1052                 ret = __fimc_md_create_fimc_is_links(fmd);
1053
1054         return ret;
1055 }
1056
1057 /*
1058  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
1059  */
1060 static void fimc_md_put_clocks(struct fimc_md *fmd)
1061 {
1062         int i = FIMC_MAX_CAMCLKS;
1063
1064         while (--i >= 0) {
1065                 if (IS_ERR(fmd->camclk[i].clock))
1066                         continue;
1067                 clk_put(fmd->camclk[i].clock);
1068                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1069         }
1070
1071         /* Writeback (PIXELASYNCMx) clocks */
1072         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
1073                 if (IS_ERR(fmd->wbclk[i]))
1074                         continue;
1075                 clk_put(fmd->wbclk[i]);
1076                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
1077         }
1078 }
1079
1080 static int fimc_md_get_clocks(struct fimc_md *fmd)
1081 {
1082         struct device *dev = &fmd->pdev->dev;
1083         char clk_name[32];
1084         struct clk *clock;
1085         int i, ret = 0;
1086
1087         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
1088                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1089
1090         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1091                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
1092                 clock = clk_get(dev, clk_name);
1093
1094                 if (IS_ERR(clock)) {
1095                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
1096                         ret = PTR_ERR(clock);
1097                         break;
1098                 }
1099                 fmd->camclk[i].clock = clock;
1100         }
1101         if (ret)
1102                 fimc_md_put_clocks(fmd);
1103
1104         if (!fmd->use_isp)
1105                 return 0;
1106         /*
1107          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
1108          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1109          */
1110         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1111
1112         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1113                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1114                 clock = clk_get(dev, clk_name);
1115                 if (IS_ERR(clock)) {
1116                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1117                                   clk_name);
1118                         ret = PTR_ERR(clock);
1119                         break;
1120                 }
1121                 fmd->wbclk[i] = clock;
1122         }
1123         if (ret)
1124                 fimc_md_put_clocks(fmd);
1125
1126         return ret;
1127 }
1128
1129 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1130 {
1131         struct exynos_video_entity *ve;
1132         struct fimc_pipeline *p;
1133         struct video_device *vdev;
1134         int ret;
1135
1136         vdev = media_entity_to_video_device(entity);
1137         if (vdev->entity.use_count == 0)
1138                 return 0;
1139
1140         ve = vdev_to_exynos_video_entity(vdev);
1141         p = to_fimc_pipeline(ve->pipe);
1142         /*
1143          * Nothing to do if we are disabling the pipeline, some link
1144          * has been disconnected and p->subdevs array is cleared now.
1145          */
1146         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1147                 return 0;
1148
1149         if (enable)
1150                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1151         else
1152                 ret = __fimc_pipeline_close(ve->pipe);
1153
1154         if (ret == 0 && !enable)
1155                 memset(p->subdevs, 0, sizeof(p->subdevs));
1156
1157         return ret;
1158 }
1159
1160 /* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
1161 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
1162                                       struct media_graph *graph)
1163 {
1164         struct media_entity *entity_err = entity;
1165         int ret;
1166
1167         /*
1168          * Walk current graph and call the pipeline open/close routine for each
1169          * opened video node that belongs to the graph of entities connected
1170          * through active links. This is needed as we cannot power on/off the
1171          * subdevs in random order.
1172          */
1173         media_graph_walk_start(graph, entity);
1174
1175         while ((entity = media_graph_walk_next(graph))) {
1176                 if (!is_media_entity_v4l2_video_device(entity))
1177                         continue;
1178
1179                 ret  = __fimc_md_modify_pipeline(entity, enable);
1180
1181                 if (ret < 0)
1182                         goto err;
1183         }
1184
1185         return 0;
1186
1187 err:
1188         media_graph_walk_start(graph, entity_err);
1189
1190         while ((entity_err = media_graph_walk_next(graph))) {
1191                 if (!is_media_entity_v4l2_video_device(entity_err))
1192                         continue;
1193
1194                 __fimc_md_modify_pipeline(entity_err, !enable);
1195
1196                 if (entity_err == entity)
1197                         break;
1198         }
1199
1200         return ret;
1201 }
1202
1203 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1204                                 unsigned int notification)
1205 {
1206         struct media_graph *graph =
1207                 &container_of(link->graph_obj.mdev, struct fimc_md,
1208                               media_dev)->link_setup_graph;
1209         struct media_entity *sink = link->sink->entity;
1210         int ret = 0;
1211
1212         /* Before link disconnection */
1213         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1214                 ret = media_graph_walk_init(graph,
1215                                                    link->graph_obj.mdev);
1216                 if (ret)
1217                         return ret;
1218                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1219                         ret = __fimc_md_modify_pipelines(sink, false, graph);
1220 #if 0
1221                 else
1222                         /* TODO: Link state change validation */
1223 #endif
1224         /* After link activation */
1225         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
1226                 if (link->flags & MEDIA_LNK_FL_ENABLED)
1227                         ret = __fimc_md_modify_pipelines(sink, true, graph);
1228                 media_graph_walk_cleanup(graph);
1229         }
1230
1231         return ret ? -EPIPE : 0;
1232 }
1233
1234 static const struct media_device_ops fimc_md_ops = {
1235         .link_notify = fimc_md_link_notify,
1236 };
1237
1238 static ssize_t fimc_md_sysfs_show(struct device *dev,
1239                                   struct device_attribute *attr, char *buf)
1240 {
1241         struct fimc_md *fmd = dev_get_drvdata(dev);
1242
1243         if (fmd->user_subdev_api)
1244                 return strscpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1245
1246         return strscpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1247 }
1248
1249 static ssize_t fimc_md_sysfs_store(struct device *dev,
1250                                    struct device_attribute *attr,
1251                                    const char *buf, size_t count)
1252 {
1253         struct fimc_md *fmd = dev_get_drvdata(dev);
1254         bool subdev_api;
1255         int i;
1256
1257         if (!strcmp(buf, "vid-dev\n"))
1258                 subdev_api = false;
1259         else if (!strcmp(buf, "sub-dev\n"))
1260                 subdev_api = true;
1261         else
1262                 return count;
1263
1264         fmd->user_subdev_api = subdev_api;
1265         for (i = 0; i < FIMC_MAX_DEVS; i++)
1266                 if (fmd->fimc[i])
1267                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1268         return count;
1269 }
1270 /*
1271  * This device attribute is to select video pipeline configuration method.
1272  * There are following valid values:
1273  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1274  *  by the host driver.
1275  *  sub-dev - for media controller API, subdevs must be configured in user
1276  *  space before starting streaming.
1277  */
1278 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1279                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1280
1281 static int cam_clk_prepare(struct clk_hw *hw)
1282 {
1283         struct cam_clk *camclk = to_cam_clk(hw);
1284
1285         if (camclk->fmd->pmf == NULL)
1286                 return -ENODEV;
1287
1288         return pm_runtime_resume_and_get(camclk->fmd->pmf);
1289 }
1290
1291 static void cam_clk_unprepare(struct clk_hw *hw)
1292 {
1293         struct cam_clk *camclk = to_cam_clk(hw);
1294
1295         if (camclk->fmd->pmf == NULL)
1296                 return;
1297
1298         pm_runtime_put_sync(camclk->fmd->pmf);
1299 }
1300
1301 static const struct clk_ops cam_clk_ops = {
1302         .prepare = cam_clk_prepare,
1303         .unprepare = cam_clk_unprepare,
1304 };
1305
1306 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1307 {
1308         struct cam_clk_provider *cp = &fmd->clk_provider;
1309         unsigned int i;
1310
1311         if (cp->of_node)
1312                 of_clk_del_provider(cp->of_node);
1313
1314         for (i = 0; i < cp->num_clocks; i++)
1315                 clk_unregister(cp->clks[i]);
1316 }
1317
1318 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1319 {
1320         struct cam_clk_provider *cp = &fmd->clk_provider;
1321         struct device *dev = &fmd->pdev->dev;
1322         int i, ret;
1323
1324         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1325                 struct cam_clk *camclk = &cp->camclk[i];
1326                 struct clk_init_data init;
1327                 const char *p_name;
1328
1329                 ret = of_property_read_string_index(dev->of_node,
1330                                         "clock-output-names", i, &init.name);
1331                 if (ret < 0)
1332                         break;
1333
1334                 p_name = __clk_get_name(fmd->camclk[i].clock);
1335
1336                 /* It's safe since clk_register() will duplicate the string. */
1337                 init.parent_names = &p_name;
1338                 init.num_parents = 1;
1339                 init.ops = &cam_clk_ops;
1340                 init.flags = CLK_SET_RATE_PARENT;
1341                 camclk->hw.init = &init;
1342                 camclk->fmd = fmd;
1343
1344                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1345                 if (IS_ERR(cp->clks[i])) {
1346                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1347                                         init.name, PTR_ERR(cp->clks[i]));
1348                         ret = PTR_ERR(cp->clks[i]);
1349                         goto err;
1350                 }
1351                 cp->num_clocks++;
1352         }
1353
1354         if (cp->num_clocks == 0) {
1355                 dev_warn(dev, "clk provider not registered\n");
1356                 return 0;
1357         }
1358
1359         cp->clk_data.clks = cp->clks;
1360         cp->clk_data.clk_num = cp->num_clocks;
1361         cp->of_node = dev->of_node;
1362         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1363                                   &cp->clk_data);
1364         if (ret == 0)
1365                 return 0;
1366 err:
1367         fimc_md_unregister_clk_provider(fmd);
1368         return ret;
1369 }
1370
1371 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1372                                  struct v4l2_subdev *subdev,
1373                                  struct v4l2_async_subdev *asd)
1374 {
1375         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1376         struct fimc_sensor_info *si = NULL;
1377         int i;
1378
1379         /* Find platform data for this sensor subdev */
1380         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1381                 if (fmd->sensor[i].asd == asd)
1382                         si = &fmd->sensor[i];
1383
1384         if (si == NULL)
1385                 return -EINVAL;
1386
1387         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1388
1389         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1390                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1391         else
1392                 subdev->grp_id = GRP_ID_SENSOR;
1393
1394         si->subdev = subdev;
1395
1396         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1397                   subdev->name, fmd->num_sensors);
1398
1399         fmd->num_sensors++;
1400
1401         return 0;
1402 }
1403
1404 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1405 {
1406         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1407         int ret;
1408
1409         mutex_lock(&fmd->media_dev.graph_mutex);
1410
1411         ret = fimc_md_create_links(fmd);
1412         if (ret < 0)
1413                 goto unlock;
1414
1415         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1416 unlock:
1417         mutex_unlock(&fmd->media_dev.graph_mutex);
1418         if (ret < 0)
1419                 return ret;
1420
1421         return media_device_register(&fmd->media_dev);
1422 }
1423
1424 static const struct v4l2_async_notifier_operations subdev_notifier_ops = {
1425         .bound = subdev_notifier_bound,
1426         .complete = subdev_notifier_complete,
1427 };
1428
1429 static int fimc_md_probe(struct platform_device *pdev)
1430 {
1431         struct device *dev = &pdev->dev;
1432         struct v4l2_device *v4l2_dev;
1433         struct pinctrl *pinctrl;
1434         struct fimc_md *fmd;
1435         int ret;
1436
1437         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1438         if (!fmd)
1439                 return -ENOMEM;
1440
1441         spin_lock_init(&fmd->slock);
1442         INIT_LIST_HEAD(&fmd->pipelines);
1443         fmd->pdev = pdev;
1444
1445         strscpy(fmd->media_dev.model, "Samsung S5P FIMC",
1446                 sizeof(fmd->media_dev.model));
1447         fmd->media_dev.ops = &fimc_md_ops;
1448         fmd->media_dev.dev = dev;
1449
1450         v4l2_dev = &fmd->v4l2_dev;
1451         v4l2_dev->mdev = &fmd->media_dev;
1452         v4l2_dev->notify = fimc_sensor_notify;
1453         strscpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1454
1455         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1456         fmd->user_subdev_api = true;
1457
1458         media_device_init(&fmd->media_dev);
1459
1460         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1461         if (ret < 0) {
1462                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1463                 goto err_md;
1464         }
1465
1466         ret = fimc_md_get_clocks(fmd);
1467         if (ret)
1468                 goto err_v4l2dev;
1469
1470         pinctrl = devm_pinctrl_get(dev);
1471         if (IS_ERR(pinctrl)) {
1472                 ret = PTR_ERR(pinctrl);
1473                 if (ret != -EPROBE_DEFER)
1474                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1475                 goto err_clk;
1476         }
1477
1478         platform_set_drvdata(pdev, fmd);
1479
1480         v4l2_async_notifier_init(&fmd->subdev_notifier);
1481
1482         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1483         if (ret)
1484                 goto err_clk;
1485
1486         ret = fimc_md_register_sensor_entities(fmd);
1487         if (ret)
1488                 goto err_m_ent;
1489
1490         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1491         if (ret)
1492                 goto err_cleanup;
1493         /*
1494          * FIMC platform devices need to be registered before the sclk_cam
1495          * clocks provider, as one of these devices needs to be activated
1496          * to enable the clock.
1497          */
1498         ret = fimc_md_register_clk_provider(fmd);
1499         if (ret < 0) {
1500                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1501                 goto err_attr;
1502         }
1503
1504         if (fmd->num_sensors > 0) {
1505                 fmd->subdev_notifier.ops = &subdev_notifier_ops;
1506                 fmd->num_sensors = 0;
1507
1508                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1509                                                 &fmd->subdev_notifier);
1510                 if (ret)
1511                         goto err_clk_p;
1512         }
1513
1514         return 0;
1515
1516 err_clk_p:
1517         fimc_md_unregister_clk_provider(fmd);
1518 err_attr:
1519         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1520 err_cleanup:
1521         v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
1522 err_m_ent:
1523         fimc_md_unregister_entities(fmd);
1524 err_clk:
1525         fimc_md_put_clocks(fmd);
1526 err_v4l2dev:
1527         v4l2_device_unregister(&fmd->v4l2_dev);
1528 err_md:
1529         media_device_cleanup(&fmd->media_dev);
1530         return ret;
1531 }
1532
1533 static int fimc_md_remove(struct platform_device *pdev)
1534 {
1535         struct fimc_md *fmd = platform_get_drvdata(pdev);
1536
1537         if (!fmd)
1538                 return 0;
1539
1540         fimc_md_unregister_clk_provider(fmd);
1541         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1542         v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
1543
1544         v4l2_device_unregister(&fmd->v4l2_dev);
1545         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1546         fimc_md_unregister_entities(fmd);
1547         fimc_md_pipelines_free(fmd);
1548         media_device_unregister(&fmd->media_dev);
1549         media_device_cleanup(&fmd->media_dev);
1550         fimc_md_put_clocks(fmd);
1551
1552         return 0;
1553 }
1554
1555 static const struct platform_device_id fimc_driver_ids[] __always_unused = {
1556         { .name = "s5p-fimc-md" },
1557         { },
1558 };
1559 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1560
1561 static const struct of_device_id fimc_md_of_match[] = {
1562         { .compatible = "samsung,fimc" },
1563         { },
1564 };
1565 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1566
1567 static struct platform_driver fimc_md_driver = {
1568         .probe          = fimc_md_probe,
1569         .remove         = fimc_md_remove,
1570         .driver = {
1571                 .of_match_table = of_match_ptr(fimc_md_of_match),
1572                 .name           = "s5p-fimc-md",
1573         }
1574 };
1575
1576 static int __init fimc_md_init(void)
1577 {
1578         int ret;
1579
1580         request_module("s5p-csis");
1581         ret = fimc_register_driver();
1582         if (ret)
1583                 return ret;
1584
1585         ret = platform_driver_register(&fimc_md_driver);
1586         if (ret)
1587                 fimc_unregister_driver();
1588
1589         return ret;
1590 }
1591
1592 static void __exit fimc_md_exit(void)
1593 {
1594         platform_driver_unregister(&fimc_md_driver);
1595         fimc_unregister_driver();
1596 }
1597
1598 module_init(fimc_md_init);
1599 module_exit(fimc_md_exit);
1600
1601 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1602 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1603 MODULE_LICENSE("GPL");
1604 MODULE_VERSION("2.0.1");