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

   1 /*
   2  * S5P/EXYNOS4 SoC series camera host interface media device driver
   3  *
   4  * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
   5  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 2 of the License,
  10  * or (at your option) any later version.
  11  */
  12
  13 #include <linux/bug.h>
  14 #include <linux/clk.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/device.h>
  17 #include <linux/errno.h>
  18 #include <linux/i2c.h>
  19 #include <linux/kernel.h>
  20 #include <linux/list.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_graph.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <media/v4l2-async.h>
  31 #include <media/v4l2-ctrls.h>
  32 #include <media/v4l2-of.h>
  33 #include <media/media-device.h>
  34 #include <media/exynos-fimc.h>
  35
  36 #include "media-dev.h"
  37 #include "fimc-core.h"
  38 #include "fimc-is.h"
  39 #include "fimc-lite.h"
  40 #include "mipi-csis.h"
  41
  42 /* Set up image sensor subdev -> FIMC capture node notifications. */
  43 static void __setup_sensor_notification(struct fimc_md *fmd,
  44                                         struct v4l2_subdev *sensor,
  45                                         struct v4l2_subdev *fimc_sd)
  46 {
  47         struct fimc_source_info *src_inf;
  48         struct fimc_sensor_info *md_si;
  49         unsigned long flags;
  50
  51         src_inf = v4l2_get_subdev_hostdata(sensor);
  52         if (!src_inf || WARN_ON(fmd == NULL))
  53                 return;
  54
  55         md_si = source_to_sensor_info(src_inf);
  56         spin_lock_irqsave(&fmd->slock, flags);
  57         md_si->host = v4l2_get_subdevdata(fimc_sd);
  58         spin_unlock_irqrestore(&fmd->slock, flags);
  59 }
  60
  61 /**
  62  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  63  * @me: media entity terminating the pipeline
  64  *
  65  * Caller holds the graph mutex.
  66  */
  67 static void fimc_pipeline_prepare(struct fimc_pipeline *p,
  68                                         struct media_entity *me)
  69 {
  70         struct fimc_md *fmd = entity_to_fimc_mdev(me);
  71         struct v4l2_subdev *sd;
  72         struct v4l2_subdev *sensor = NULL;
  73         int i;
  74
  75         for (i = 0; i < IDX_MAX; i++)
  76                 p->subdevs[i] = NULL;
  77
  78         while (1) {
  79                 struct media_pad *pad = NULL;
  80
  81                 /* Find remote source pad */
  82                 for (i = 0; i < me->num_pads; i++) {
  83                         struct media_pad *spad = &me->pads[i];
  84                         if (!(spad->flags & MEDIA_PAD_FL_SINK))
  85                                 continue;
  86                         pad = media_entity_remote_pad(spad);
  87                         if (pad)
  88                                 break;
  89                 }
  90
  91                 if (pad == NULL ||
  92                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
  93                         break;
  94                 sd = media_entity_to_v4l2_subdev(pad->entity);
  95
  96                 switch (sd->grp_id) {
  97                 case GRP_ID_SENSOR:
  98                         sensor = sd;
  99                         /* fall through */
 100                 case GRP_ID_FIMC_IS_SENSOR:
 101                         p->subdevs[IDX_SENSOR] = sd;
 102                         break;
 103                 case GRP_ID_CSIS:
 104                         p->subdevs[IDX_CSIS] = sd;
 105                         break;
 106                 case GRP_ID_FLITE:
 107                         p->subdevs[IDX_FLITE] = sd;
 108                         break;
 109                 case GRP_ID_FIMC:
 110                         p->subdevs[IDX_FIMC] = sd;
 111                         break;
 112                 case GRP_ID_FIMC_IS:
 113                         p->subdevs[IDX_IS_ISP] = sd;
 114                         break;
 115                 default:
 116                         break;
 117                 }
 118                 me = &sd->entity;
 119                 if (me->num_pads == 1)
 120                         break;
 121         }
 122
 123         if (sensor && p->subdevs[IDX_FIMC])
 124                 __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
 125 }
 126
 127 /**
 128  * __subdev_set_power - change power state of a single subdev
 129  * @sd: subdevice to change power state for
 130  * @on: 1 to enable power or 0 to disable
 131  *
 132  * Return result of s_power subdev operation or -ENXIO if sd argument
 133  * is NULL. Return 0 if the subdevice does not implement s_power.
 134  */
 135 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
 136 {
 137         int *use_count;
 138         int ret;
 139
 140         if (sd == NULL)
 141                 return -ENXIO;
 142
 143         use_count = &sd->entity.use_count;
 144         if (on && (*use_count)++ > 0)
 145                 return 0;
 146         else if (!on && (*use_count == 0 || --(*use_count) > 0))
 147                 return 0;
 148         ret = v4l2_subdev_call(sd, core, s_power, on);
 149
 150         return ret != -ENOIOCTLCMD ? ret : 0;
 151 }
 152
 153 /**
 154  * fimc_pipeline_s_power - change power state of all pipeline subdevs
 155  * @fimc: fimc device terminating the pipeline
 156  * @state: true to power on, false to power off
 157  *
 158  * Needs to be called with the graph mutex held.
 159  */
 160 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
 161 {
 162         static const u8 seq[2][IDX_MAX - 1] = {
 163                 { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
 164                 { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
 165         };
 166         int i, ret = 0;
 167
 168         if (p->subdevs[IDX_SENSOR] == NULL)
 169                 return -ENXIO;
 170
 171         for (i = 0; i < IDX_MAX - 1; i++) {
 172                 unsigned int idx = seq[on][i];
 173
 174                 ret = __subdev_set_power(p->subdevs[idx], on);
 175
 176
 177                 if (ret < 0 && ret != -ENXIO)
 178                         goto error;
 179         }
 180         return 0;
 181 error:
 182         for (; i >= 0; i--) {
 183                 unsigned int idx = seq[on][i];
 184                 __subdev_set_power(p->subdevs[idx], !on);
 185         }
 186         return ret;
 187 }
 188
 189 /**
 190  * __fimc_pipeline_open - update the pipeline information, enable power
 191  *                        of all pipeline subdevs and the sensor clock
 192  * @me: media entity to start graph walk with
 193  * @prepare: true to walk the current pipeline and acquire all subdevs
 194  *
 195  * Called with the graph mutex held.
 196  */
 197 static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
 198                                 struct media_entity *me, bool prepare)
 199 {
 200         struct fimc_md *fmd = entity_to_fimc_mdev(me);
 201         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 202         struct v4l2_subdev *sd;
 203         int ret;
 204
 205         if (WARN_ON(p == NULL || me == NULL))
 206                 return -EINVAL;
 207
 208         if (prepare)
 209                 fimc_pipeline_prepare(p, me);
 210
 211         sd = p->subdevs[IDX_SENSOR];
 212         if (sd == NULL)
 213                 return -EINVAL;
 214
 215         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 216         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
 217                 ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
 218                 if (ret < 0)
 219                         return ret;
 220         }
 221
 222         ret = fimc_pipeline_s_power(p, 1);
 223         if (!ret)
 224                 return 0;
 225
 226         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 227                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 228
 229         return ret;
 230 }
 231
 232 /**
 233  * __fimc_pipeline_close - disable the sensor clock and pipeline power
 234  * @fimc: fimc device terminating the pipeline
 235  *
 236  * Disable power of all subdevs and turn the external sensor clock off.
 237  */
 238 static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
 239 {
 240         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 241         struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
 242         struct fimc_md *fmd;
 243         int ret;
 244
 245         if (sd == NULL) {
 246                 pr_warn("%s(): No sensor subdev\n", __func__);
 247                 return 0;
 248         }
 249
 250         ret = fimc_pipeline_s_power(p, 0);
 251
 252         fmd = entity_to_fimc_mdev(&sd->entity);
 253
 254         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 255         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 256                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 257
 258         return ret == -ENXIO ? 0 : ret;
 259 }
 260
 261 /**
 262  * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 263  * @pipeline: video pipeline structure
 264  * @on: passed as the s_stream() callback argument
 265  */
 266 static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 267 {
 268         static const u8 seq[2][IDX_MAX] = {
 269                 { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
 270                 { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 271         };
 272         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 273         int i, ret = 0;
 274
 275         if (p->subdevs[IDX_SENSOR] == NULL)
 276                 return -ENODEV;
 277
 278         for (i = 0; i < IDX_MAX; i++) {
 279                 unsigned int idx = seq[on][i];
 280
 281                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
 282
 283                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 284                         goto error;
 285         }
 286         return 0;
 287 error:
 288         for (; i >= 0; i--) {
 289                 unsigned int idx = seq[on][i];
 290                 v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
 291         }
 292         return ret;
 293 }
 294
 295 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
 296 static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
 297         .open           = __fimc_pipeline_open,
 298         .close          = __fimc_pipeline_close,
 299         .set_stream     = __fimc_pipeline_s_stream,
 300 };
 301
 302 static struct exynos_media_pipeline *fimc_md_pipeline_create(
 303                                                 struct fimc_md *fmd)
 304 {
 305         struct fimc_pipeline *p;
 306
 307         p = kzalloc(sizeof(*p), GFP_KERNEL);
 308         if (!p)
 309                 return NULL;
 310
 311         list_add_tail(&p->list, &fmd->pipelines);
 312
 313         p->ep.ops = &fimc_pipeline_ops;
 314         return &p->ep;
 315 }
 316
 317 static void fimc_md_pipelines_free(struct fimc_md *fmd)
 318 {
 319         while (!list_empty(&fmd->pipelines)) {
 320                 struct fimc_pipeline *p;
 321
 322                 p = list_entry(fmd->pipelines.next, typeof(*p), list);
 323                 list_del(&p->list);
 324                 kfree(p);
 325         }
 326 }
 327
 328 /* Parse port node and register as a sub-device any sensor specified there. */
 329 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 330                                    struct device_node *port,
 331                                    unsigned int index)
 332 {
 333         struct fimc_source_info *pd = &fmd->sensor[index].pdata;
 334         struct device_node *rem, *ep, *np;
 335         struct v4l2_of_endpoint endpoint;
 336
 337         /* Assume here a port node can have only one endpoint node. */
 338         ep = of_get_next_child(port, NULL);
 339         if (!ep)
 340                 return 0;
 341
 342         v4l2_of_parse_endpoint(ep, &endpoint);
 343         if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
 344                 return -EINVAL;
 345
 346         pd->mux_id = (endpoint.base.port - 1) & 0x1;
 347
 348         rem = of_graph_get_remote_port_parent(ep);
 349         of_node_put(ep);
 350         if (rem == NULL) {
 351                 v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
 352                                                         ep->full_name);
 353                 return 0;
 354         }
 355
 356         if (fimc_input_is_parallel(endpoint.base.port)) {
 357                 if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
 358                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
 359                 else
 360                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
 361                 pd->flags = endpoint.bus.parallel.flags;
 362         } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
 363                 /*
 364                  * MIPI CSI-2: only input mux selection and
 365                  * the sensor's clock frequency is needed.
 366                  */
 367                 pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
 368         } else {
 369                 v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
 370                          endpoint.base.port, rem->full_name);
 371         }
 372         /*
 373          * For FIMC-IS handled sensors, that are placed under i2c-isp device
 374          * node, FIMC is connected to the FIMC-IS through its ISP Writeback
 375          * input. Sensors are attached to the FIMC-LITE hostdata interface
 376          * directly or through MIPI-CSIS, depending on the external media bus
 377          * used. This needs to be handled in a more reliable way, not by just
 378          * checking parent's node name.
 379          */
 380         np = of_get_parent(rem);
 381
 382         if (np && !of_node_cmp(np->name, "i2c-isp"))
 383                 pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
 384         else
 385                 pd->fimc_bus_type = pd->sensor_bus_type;
 386
 387         if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor)))
 388                 return -EINVAL;
 389
 390         fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
 391         fmd->sensor[index].asd.match.of.node = rem;
 392         fmd->async_subdevs[index] = &fmd->sensor[index].asd;
 393
 394         fmd->num_sensors++;
 395
 396         of_node_put(rem);
 397         return 0;
 398 }
 399
 400 /* Register all SoC external sub-devices */
 401 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 402 {
 403         struct device_node *parent = fmd->pdev->dev.of_node;
 404         struct device_node *node, *ports;
 405         int index = 0;
 406         int ret;
 407
 408         /*
 409          * Runtime resume one of the FIMC entities to make sure
 410          * the sclk_cam clocks are not globally disabled.
 411          */
 412         if (!fmd->pmf)
 413                 return -ENXIO;
 414
 415         ret = pm_runtime_get_sync(fmd->pmf);
 416         if (ret < 0) {
 417                 pm_runtime_put(fmd->pmf);
 418                 return ret;
 419         }
 420
 421         fmd->num_sensors = 0;
 422
 423         /* Attach sensors linked to MIPI CSI-2 receivers */
 424         for_each_available_child_of_node(parent, node) {
 425                 struct device_node *port;
 426
 427                 if (of_node_cmp(node->name, "csis"))
 428                         continue;
 429                 /* The csis node can have only port subnode. */
 430                 port = of_get_next_child(node, NULL);
 431                 if (!port)
 432                         continue;
 433
 434                 ret = fimc_md_parse_port_node(fmd, port, index);
 435                 if (ret < 0)
 436                         goto rpm_put;
 437                 index++;
 438         }
 439
 440         /* Attach sensors listed in the parallel-ports node */
 441         ports = of_get_child_by_name(parent, "parallel-ports");
 442         if (!ports)
 443                 goto rpm_put;
 444
 445         for_each_child_of_node(ports, node) {
 446                 ret = fimc_md_parse_port_node(fmd, node, index);
 447                 if (ret < 0)
 448                         break;
 449                 index++;
 450         }
 451 rpm_put:
 452         pm_runtime_put(fmd->pmf);
 453         return ret;
 454 }
 455
 456 static int __of_get_csis_id(struct device_node *np)
 457 {
 458         u32 reg = 0;
 459
 460         np = of_get_child_by_name(np, "port");
 461         if (!np)
 462                 return -EINVAL;
 463         of_property_read_u32(np, "reg", &reg);
 464         return reg - FIMC_INPUT_MIPI_CSI2_0;
 465 }
 466
 467 /*
 468  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 469  */
 470 static int register_fimc_lite_entity(struct fimc_md *fmd,
 471                                      struct fimc_lite *fimc_lite)
 472 {
 473         struct v4l2_subdev *sd;
 474         struct exynos_media_pipeline *ep;
 475         int ret;
 476
 477         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 478                     fmd->fimc_lite[fimc_lite->index]))
 479                 return -EBUSY;
 480
 481         sd = &fimc_lite->subdev;
 482         sd->grp_id = GRP_ID_FLITE;
 483
 484         ep = fimc_md_pipeline_create(fmd);
 485         if (!ep)
 486                 return -ENOMEM;
 487
 488         v4l2_set_subdev_hostdata(sd, ep);
 489
 490         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 491         if (!ret)
 492                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 493         else
 494                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 495                          fimc_lite->index);
 496         return ret;
 497 }
 498
 499 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 500 {
 501         struct v4l2_subdev *sd;
 502         struct exynos_media_pipeline *ep;
 503         int ret;
 504
 505         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 506                 return -EBUSY;
 507
 508         sd = &fimc->vid_cap.subdev;
 509         sd->grp_id = GRP_ID_FIMC;
 510
 511         ep = fimc_md_pipeline_create(fmd);
 512         if (!ep)
 513                 return -ENOMEM;
 514
 515         v4l2_set_subdev_hostdata(sd, ep);
 516
 517         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 518         if (!ret) {
 519                 if (!fmd->pmf && fimc->pdev)
 520                         fmd->pmf = &fimc->pdev->dev;
 521                 fmd->fimc[fimc->id] = fimc;
 522                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 523         } else {
 524                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 525                          fimc->id, ret);
 526         }
 527         return ret;
 528 }
 529
 530 static int register_csis_entity(struct fimc_md *fmd,
 531                                 struct platform_device *pdev,
 532                                 struct v4l2_subdev *sd)
 533 {
 534         struct device_node *node = pdev->dev.of_node;
 535         int id, ret;
 536
 537         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 538
 539         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 540                 return -ENOENT;
 541
 542         if (WARN_ON(fmd->csis[id].sd))
 543                 return -EBUSY;
 544
 545         sd->grp_id = GRP_ID_CSIS;
 546         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 547         if (!ret)
 548                 fmd->csis[id].sd = sd;
 549         else
 550                 v4l2_err(&fmd->v4l2_dev,
 551                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 552         return ret;
 553 }
 554
 555 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 556 {
 557         struct v4l2_subdev *sd = &is->isp.subdev;
 558         struct exynos_media_pipeline *ep;
 559         int ret;
 560
 561         /* Allocate pipeline object for the ISP capture video node. */
 562         ep = fimc_md_pipeline_create(fmd);
 563         if (!ep)
 564                 return -ENOMEM;
 565
 566         v4l2_set_subdev_hostdata(sd, ep);
 567
 568         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 569         if (ret) {
 570                 v4l2_err(&fmd->v4l2_dev,
 571                          "Failed to register FIMC-ISP (%d)\n", ret);
 572                 return ret;
 573         }
 574
 575         fmd->fimc_is = is;
 576         return 0;
 577 }
 578
 579 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 580                                             struct platform_device *pdev,
 581                                             int plat_entity)
 582 {
 583         struct device *dev = &pdev->dev;
 584         int ret = -EPROBE_DEFER;
 585         void *drvdata;
 586
 587         /* Lock to ensure dev->driver won't change. */
 588         device_lock(dev);
 589
 590         if (!dev->driver || !try_module_get(dev->driver->owner))
 591                 goto dev_unlock;
 592
 593         drvdata = dev_get_drvdata(dev);
 594         /* Some subdev didn't probe successfully id drvdata is NULL */
 595         if (drvdata) {
 596                 switch (plat_entity) {
 597                 case IDX_FIMC:
 598                         ret = register_fimc_entity(fmd, drvdata);
 599                         break;
 600                 case IDX_FLITE:
 601                         ret = register_fimc_lite_entity(fmd, drvdata);
 602                         break;
 603                 case IDX_CSIS:
 604                         ret = register_csis_entity(fmd, pdev, drvdata);
 605                         break;
 606                 case IDX_IS_ISP:
 607                         ret = register_fimc_is_entity(fmd, drvdata);
 608                         break;
 609                 default:
 610                         ret = -ENODEV;
 611                 }
 612         }
 613
 614         module_put(dev->driver->owner);
 615 dev_unlock:
 616         device_unlock(dev);
 617         if (ret == -EPROBE_DEFER)
 618                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 619                         dev_name(dev));
 620         else if (ret < 0)
 621                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 622                         dev_name(dev), ret);
 623         return ret;
 624 }
 625
 626 /* Register FIMC, FIMC-LITE and CSIS media entities */
 627 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 628                                               struct device_node *parent)
 629 {
 630         struct device_node *node;
 631         int ret = 0;
 632
 633         for_each_available_child_of_node(parent, node) {
 634                 struct platform_device *pdev;
 635                 int plat_entity = -1;
 636
 637                 pdev = of_find_device_by_node(node);
 638                 if (!pdev)
 639                         continue;
 640
 641                 /* If driver of any entity isn't ready try all again later. */
 642                 if (!strcmp(node->name, CSIS_OF_NODE_NAME))
 643                         plat_entity = IDX_CSIS;
 644                 else if (!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
 645                         plat_entity = IDX_IS_ISP;
 646                 else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
 647                         plat_entity = IDX_FLITE;
 648                 else if (!strcmp(node->name, FIMC_OF_NODE_NAME) &&
 649                          !of_property_read_bool(node, "samsung,lcd-wb"))
 650                         plat_entity = IDX_FIMC;
 651
 652                 if (plat_entity >= 0)
 653                         ret = fimc_md_register_platform_entity(fmd, pdev,
 654                                                         plat_entity);
 655                 put_device(&pdev->dev);
 656                 if (ret < 0)
 657                         break;
 658         }
 659
 660         return ret;
 661 }
 662
 663 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 664 {
 665         int i;
 666
 667         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 668                 struct fimc_dev *dev = fmd->fimc[i];
 669                 if (dev == NULL)
 670                         continue;
 671                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 672                 dev->vid_cap.ve.pipe = NULL;
 673                 fmd->fimc[i] = NULL;
 674         }
 675         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 676                 struct fimc_lite *dev = fmd->fimc_lite[i];
 677                 if (dev == NULL)
 678                         continue;
 679                 v4l2_device_unregister_subdev(&dev->subdev);
 680                 dev->ve.pipe = NULL;
 681                 fmd->fimc_lite[i] = NULL;
 682         }
 683         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 684                 if (fmd->csis[i].sd == NULL)
 685                         continue;
 686                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 687                 fmd->csis[i].sd = NULL;
 688         }
 689
 690         if (fmd->fimc_is)
 691                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 692
 693         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 694 }
 695
 696 /**
 697  * __fimc_md_create_fimc_links - create links to all FIMC entities
 698  * @fmd: fimc media device
 699  * @source: the source entity to create links to all fimc entities from
 700  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 701  * @pad: the source entity pad index
 702  * @link_mask: bitmask of the fimc devices for which link should be enabled
 703  */
 704 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 705                                             struct media_entity *source,
 706                                             struct v4l2_subdev *sensor,
 707                                             int pad, int link_mask)
 708 {
 709         struct fimc_source_info *si = NULL;
 710         struct media_entity *sink;
 711         unsigned int flags = 0;
 712         int i, ret = 0;
 713
 714         if (sensor) {
 715                 si = v4l2_get_subdev_hostdata(sensor);
 716                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 717                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 718                         ret = 1;
 719         }
 720
 721         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 722                 if (!fmd->fimc[i])
 723                         continue;
 724                 /*
 725                  * Some FIMC variants are not fitted with camera capture
 726                  * interface. Skip creating a link from sensor for those.
 727                  */
 728                 if (!fmd->fimc[i]->variant->has_cam_if)
 729                         continue;
 730
 731                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 732
 733                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 734                 ret = media_entity_create_link(source, pad, sink,
 735                                               FIMC_SD_PAD_SINK_CAM, flags);
 736                 if (ret)
 737                         return ret;
 738
 739                 /* Notify FIMC capture subdev entity */
 740                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 741                                         &source->pads[pad], flags);
 742                 if (ret)
 743                         break;
 744
 745                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 746                           source->name, flags ? '=' : '-', sink->name);
 747         }
 748
 749         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 750                 if (!fmd->fimc_lite[i])
 751                         continue;
 752
 753                 sink = &fmd->fimc_lite[i]->subdev.entity;
 754                 ret = media_entity_create_link(source, pad, sink,
 755                                                FLITE_SD_PAD_SINK, 0);
 756                 if (ret)
 757                         return ret;
 758
 759                 /* Notify FIMC-LITE subdev entity */
 760                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 761                                         &source->pads[pad], 0);
 762                 if (ret)
 763                         break;
 764
 765                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 766                           source->name, sink->name);
 767         }
 768         return 0;
 769 }
 770
 771 /* Create links from FIMC-LITE source pads to other entities */
 772 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 773 {
 774         struct media_entity *source, *sink;
 775         int i, ret = 0;
 776
 777         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 778                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 779
 780                 if (fimc == NULL)
 781                         continue;
 782
 783                 source = &fimc->subdev.entity;
 784                 sink = &fimc->ve.vdev.entity;
 785                 /* FIMC-LITE's subdev and video node */
 786                 ret = media_entity_create_link(source, FLITE_SD_PAD_SOURCE_DMA,
 787                                                sink, 0, 0);
 788                 if (ret)
 789                         break;
 790                 /* Link from FIMC-LITE to IS-ISP subdev */
 791                 sink = &fmd->fimc_is->isp.subdev.entity;
 792                 ret = media_entity_create_link(source, FLITE_SD_PAD_SOURCE_ISP,
 793                                                sink, 0, 0);
 794                 if (ret)
 795                         break;
 796         }
 797
 798         return ret;
 799 }
 800
 801 /* Create FIMC-IS links */
 802 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 803 {
 804         struct fimc_isp *isp = &fmd->fimc_is->isp;
 805         struct media_entity *source, *sink;
 806         int i, ret;
 807
 808         source = &isp->subdev.entity;
 809
 810         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 811                 if (fmd->fimc[i] == NULL)
 812                         continue;
 813
 814                 /* Link from FIMC-IS-ISP subdev to FIMC */
 815                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 816                 ret = media_entity_create_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 817                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 818                 if (ret)
 819                         return ret;
 820         }
 821
 822         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 823         sink = &isp->video_capture.ve.vdev.entity;
 824
 825         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 826         if (sink->num_pads == 0)
 827                 return 0;
 828
 829         return media_entity_create_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 830                                         sink, 0, 0);
 831 }
 832
 833 /**
 834  * fimc_md_create_links - create default links between registered entities
 835  *
 836  * Parallel interface sensor entities are connected directly to FIMC capture
 837  * entities. The sensors using MIPI CSIS bus are connected through immutable
 838  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 839  * entity has a link to each registered FIMC capture entity. Enabled links
 840  * are created by default between each subsequent registered sensor and
 841  * subsequent FIMC capture entity. The number of default active links is
 842  * determined by the number of available sensors or FIMC entities,
 843  * whichever is less.
 844  */
 845 static int fimc_md_create_links(struct fimc_md *fmd)
 846 {
 847         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 848         struct v4l2_subdev *sensor, *csis;
 849         struct fimc_source_info *pdata;
 850         struct media_entity *source, *sink;
 851         int i, pad, fimc_id = 0, ret = 0;
 852         u32 flags, link_mask = 0;
 853
 854         for (i = 0; i < fmd->num_sensors; i++) {
 855                 if (fmd->sensor[i].subdev == NULL)
 856                         continue;
 857
 858                 sensor = fmd->sensor[i].subdev;
 859                 pdata = v4l2_get_subdev_hostdata(sensor);
 860                 if (!pdata)
 861                         continue;
 862
 863                 source = NULL;
 864
 865                 switch (pdata->sensor_bus_type) {
 866                 case FIMC_BUS_TYPE_MIPI_CSI2:
 867                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 868                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 869                                 return -EINVAL;
 870
 871                         csis = fmd->csis[pdata->mux_id].sd;
 872                         if (WARN(csis == NULL,
 873                                  "MIPI-CSI interface specified "
 874                                  "but s5p-csis module is not loaded!\n"))
 875                                 return -EINVAL;
 876
 877                         pad = sensor->entity.num_pads - 1;
 878                         ret = media_entity_create_link(&sensor->entity, pad,
 879                                               &csis->entity, CSIS_PAD_SINK,
 880                                               MEDIA_LNK_FL_IMMUTABLE |
 881                                               MEDIA_LNK_FL_ENABLED);
 882                         if (ret)
 883                                 return ret;
 884
 885                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 886                                   sensor->entity.name, csis->entity.name);
 887
 888                         source = NULL;
 889                         csi_sensors[pdata->mux_id] = sensor;
 890                         break;
 891
 892                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
 893                         source = &sensor->entity;
 894                         pad = 0;
 895                         break;
 896
 897                 default:
 898                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 899                                  pdata->sensor_bus_type);
 900                         return -EINVAL;
 901                 }
 902                 if (source == NULL)
 903                         continue;
 904
 905                 link_mask = 1 << fimc_id++;
 906                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 907                                                        pad, link_mask);
 908         }
 909
 910         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 911                 if (fmd->csis[i].sd == NULL)
 912                         continue;
 913
 914                 source = &fmd->csis[i].sd->entity;
 915                 pad = CSIS_PAD_SOURCE;
 916                 sensor = csi_sensors[i];
 917
 918                 link_mask = 1 << fimc_id++;
 919                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 920                                                        pad, link_mask);
 921         }
 922
 923         /* Create immutable links between each FIMC's subdev and video node */
 924         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 925         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 926                 if (!fmd->fimc[i])
 927                         continue;
 928
 929                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
 930                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
 931
 932                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
 933                                               sink, 0, flags);
 934                 if (ret)
 935                         break;
 936         }
 937
 938         ret = __fimc_md_create_flite_source_links(fmd);
 939         if (ret < 0)
 940                 return ret;
 941
 942         if (fmd->use_isp)
 943                 ret = __fimc_md_create_fimc_is_links(fmd);
 944
 945         return ret;
 946 }
 947
 948 /*
 949  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
 950  */
 951 static void fimc_md_put_clocks(struct fimc_md *fmd)
 952 {
 953         int i = FIMC_MAX_CAMCLKS;
 954
 955         while (--i >= 0) {
 956                 if (IS_ERR(fmd->camclk[i].clock))
 957                         continue;
 958                 clk_put(fmd->camclk[i].clock);
 959                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
 960         }
 961
 962         /* Writeback (PIXELASYNCMx) clocks */
 963         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
 964                 if (IS_ERR(fmd->wbclk[i]))
 965                         continue;
 966                 clk_put(fmd->wbclk[i]);
 967                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
 968         }
 969 }
 970
 971 static int fimc_md_get_clocks(struct fimc_md *fmd)
 972 {
 973         struct device *dev = &fmd->pdev->dev;
 974         char clk_name[32];
 975         struct clk *clock;
 976         int i, ret = 0;
 977
 978         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
 979                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
 980
 981         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
 982                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
 983                 clock = clk_get(dev, clk_name);
 984
 985                 if (IS_ERR(clock)) {
 986                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
 987                         ret = PTR_ERR(clock);
 988                         break;
 989                 }
 990                 fmd->camclk[i].clock = clock;
 991         }
 992         if (ret)
 993                 fimc_md_put_clocks(fmd);
 994
 995         if (!fmd->use_isp)
 996                 return 0;
 997         /*
 998          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
 999          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1000          */
1001         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1002
1003         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1004                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1005                 clock = clk_get(dev, clk_name);
1006                 if (IS_ERR(clock)) {
1007                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1008                                   clk_name);
1009                         ret = PTR_ERR(clock);
1010                         break;
1011                 }
1012                 fmd->wbclk[i] = clock;
1013         }
1014         if (ret)
1015                 fimc_md_put_clocks(fmd);
1016
1017         return ret;
1018 }
1019
1020 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1021 {
1022         struct exynos_video_entity *ve;
1023         struct fimc_pipeline *p;
1024         struct video_device *vdev;
1025         int ret;
1026
1027         vdev = media_entity_to_video_device(entity);
1028         if (vdev->entity.use_count == 0)
1029                 return 0;
1030
1031         ve = vdev_to_exynos_video_entity(vdev);
1032         p = to_fimc_pipeline(ve->pipe);
1033         /*
1034          * Nothing to do if we are disabling the pipeline, some link
1035          * has been disconnected and p->subdevs array is cleared now.
1036          */
1037         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1038                 return 0;
1039
1040         if (enable)
1041                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1042         else
1043                 ret = __fimc_pipeline_close(ve->pipe);
1044
1045         if (ret == 0 && !enable)
1046                 memset(p->subdevs, 0, sizeof(p->subdevs));
1047
1048         return ret;
1049 }
1050
1051 /* Locking: called with entity->parent->graph_mutex mutex held. */
1052 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable)
1053 {
1054         struct media_entity *entity_err = entity;
1055         struct media_entity_graph graph;
1056         int ret;
1057
1058         /*
1059          * Walk current graph and call the pipeline open/close routine for each
1060          * opened video node that belongs to the graph of entities connected
1061          * through active links. This is needed as we cannot power on/off the
1062          * subdevs in random order.
1063          */
1064         media_entity_graph_walk_start(&graph, entity);
1065
1066         while ((entity = media_entity_graph_walk_next(&graph))) {
1067                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
1068                         continue;
1069
1070                 ret  = __fimc_md_modify_pipeline(entity, enable);
1071
1072                 if (ret < 0)
1073                         goto err;
1074         }
1075
1076         return 0;
1077  err:
1078         media_entity_graph_walk_start(&graph, entity_err);
1079
1080         while ((entity_err = media_entity_graph_walk_next(&graph))) {
1081                 if (media_entity_type(entity_err) != MEDIA_ENT_T_DEVNODE)
1082                         continue;
1083
1084                 __fimc_md_modify_pipeline(entity_err, !enable);
1085
1086                 if (entity_err == entity)
1087                         break;
1088         }
1089
1090         return ret;
1091 }
1092
1093 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1094                                 unsigned int notification)
1095 {
1096         struct media_entity *sink = link->sink->entity;
1097         int ret = 0;
1098
1099         /* Before link disconnection */
1100         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1101                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1102                         ret = __fimc_md_modify_pipelines(sink, false);
1103 #if 0
1104                 else
1105                         /* TODO: Link state change validation */
1106 #endif
1107         /* After link activation */
1108         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
1109                    (link->flags & MEDIA_LNK_FL_ENABLED)) {
1110                 ret = __fimc_md_modify_pipelines(sink, true);
1111         }
1112
1113         return ret ? -EPIPE : 0;
1114 }
1115
1116 static ssize_t fimc_md_sysfs_show(struct device *dev,
1117                                   struct device_attribute *attr, char *buf)
1118 {
1119         struct platform_device *pdev = to_platform_device(dev);
1120         struct fimc_md *fmd = platform_get_drvdata(pdev);
1121
1122         if (fmd->user_subdev_api)
1123                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1124
1125         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1126 }
1127
1128 static ssize_t fimc_md_sysfs_store(struct device *dev,
1129                                    struct device_attribute *attr,
1130                                    const char *buf, size_t count)
1131 {
1132         struct platform_device *pdev = to_platform_device(dev);
1133         struct fimc_md *fmd = platform_get_drvdata(pdev);
1134         bool subdev_api;
1135         int i;
1136
1137         if (!strcmp(buf, "vid-dev\n"))
1138                 subdev_api = false;
1139         else if (!strcmp(buf, "sub-dev\n"))
1140                 subdev_api = true;
1141         else
1142                 return count;
1143
1144         fmd->user_subdev_api = subdev_api;
1145         for (i = 0; i < FIMC_MAX_DEVS; i++)
1146                 if (fmd->fimc[i])
1147                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1148         return count;
1149 }
1150 /*
1151  * This device attribute is to select video pipeline configuration method.
1152  * There are following valid values:
1153  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1154  *  by the host driver.
1155  *  sub-dev - for media controller API, subdevs must be configured in user
1156  *  space before starting streaming.
1157  */
1158 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1159                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1160
1161 static int fimc_md_get_pinctrl(struct fimc_md *fmd)
1162 {
1163         struct device *dev = &fmd->pdev->dev;
1164         struct fimc_pinctrl *pctl = &fmd->pinctl;
1165
1166         pctl->pinctrl = devm_pinctrl_get(dev);
1167         if (IS_ERR(pctl->pinctrl))
1168                 return PTR_ERR(pctl->pinctrl);
1169
1170         pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
1171                                         PINCTRL_STATE_DEFAULT);
1172         if (IS_ERR(pctl->state_default))
1173                 return PTR_ERR(pctl->state_default);
1174
1175         /* PINCTRL_STATE_IDLE is optional */
1176         pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
1177                                         PINCTRL_STATE_IDLE);
1178         return 0;
1179 }
1180
1181 static int cam_clk_prepare(struct clk_hw *hw)
1182 {
1183         struct cam_clk *camclk = to_cam_clk(hw);
1184         int ret;
1185
1186         if (camclk->fmd->pmf == NULL)
1187                 return -ENODEV;
1188
1189         ret = pm_runtime_get_sync(camclk->fmd->pmf);
1190         return ret < 0 ? ret : 0;
1191 }
1192
1193 static void cam_clk_unprepare(struct clk_hw *hw)
1194 {
1195         struct cam_clk *camclk = to_cam_clk(hw);
1196
1197         if (camclk->fmd->pmf == NULL)
1198                 return;
1199
1200         pm_runtime_put_sync(camclk->fmd->pmf);
1201 }
1202
1203 static const struct clk_ops cam_clk_ops = {
1204         .prepare = cam_clk_prepare,
1205         .unprepare = cam_clk_unprepare,
1206 };
1207
1208 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1209 {
1210         struct cam_clk_provider *cp = &fmd->clk_provider;
1211         unsigned int i;
1212
1213         if (cp->of_node)
1214                 of_clk_del_provider(cp->of_node);
1215
1216         for (i = 0; i < cp->num_clocks; i++)
1217                 clk_unregister(cp->clks[i]);
1218 }
1219
1220 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1221 {
1222         struct cam_clk_provider *cp = &fmd->clk_provider;
1223         struct device *dev = &fmd->pdev->dev;
1224         int i, ret;
1225
1226         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1227                 struct cam_clk *camclk = &cp->camclk[i];
1228                 struct clk_init_data init;
1229                 const char *p_name;
1230
1231                 ret = of_property_read_string_index(dev->of_node,
1232                                         "clock-output-names", i, &init.name);
1233                 if (ret < 0)
1234                         break;
1235
1236                 p_name = __clk_get_name(fmd->camclk[i].clock);
1237
1238                 /* It's safe since clk_register() will duplicate the string. */
1239                 init.parent_names = &p_name;
1240                 init.num_parents = 1;
1241                 init.ops = &cam_clk_ops;
1242                 init.flags = CLK_SET_RATE_PARENT;
1243                 camclk->hw.init = &init;
1244                 camclk->fmd = fmd;
1245
1246                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1247                 if (IS_ERR(cp->clks[i])) {
1248                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1249                                         init.name, PTR_ERR(cp->clks[i]));
1250                         ret = PTR_ERR(cp->clks[i]);
1251                         goto err;
1252                 }
1253                 cp->num_clocks++;
1254         }
1255
1256         if (cp->num_clocks == 0) {
1257                 dev_warn(dev, "clk provider not registered\n");
1258                 return 0;
1259         }
1260
1261         cp->clk_data.clks = cp->clks;
1262         cp->clk_data.clk_num = cp->num_clocks;
1263         cp->of_node = dev->of_node;
1264         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1265                                   &cp->clk_data);
1266         if (ret == 0)
1267                 return 0;
1268 err:
1269         fimc_md_unregister_clk_provider(fmd);
1270         return ret;
1271 }
1272
1273 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1274                                  struct v4l2_subdev *subdev,
1275                                  struct v4l2_async_subdev *asd)
1276 {
1277         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1278         struct fimc_sensor_info *si = NULL;
1279         int i;
1280
1281         /* Find platform data for this sensor subdev */
1282         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1283                 if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
1284                         si = &fmd->sensor[i];
1285
1286         if (si == NULL)
1287                 return -EINVAL;
1288
1289         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1290
1291         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1292                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1293         else
1294                 subdev->grp_id = GRP_ID_SENSOR;
1295
1296         si->subdev = subdev;
1297
1298         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1299                   subdev->name, fmd->num_sensors);
1300
1301         fmd->num_sensors++;
1302
1303         return 0;
1304 }
1305
1306 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1307 {
1308         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1309         int ret;
1310
1311         mutex_lock(&fmd->media_dev.graph_mutex);
1312
1313         ret = fimc_md_create_links(fmd);
1314         if (ret < 0)
1315                 goto unlock;
1316
1317         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1318 unlock:
1319         mutex_unlock(&fmd->media_dev.graph_mutex);
1320         return ret;
1321 }
1322
1323 static int fimc_md_probe(struct platform_device *pdev)
1324 {
1325         struct device *dev = &pdev->dev;
1326         struct v4l2_device *v4l2_dev;
1327         struct fimc_md *fmd;
1328         int ret;
1329
1330         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1331         if (!fmd)
1332                 return -ENOMEM;
1333
1334         spin_lock_init(&fmd->slock);
1335         INIT_LIST_HEAD(&fmd->pipelines);
1336         fmd->pdev = pdev;
1337
1338         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
1339                 sizeof(fmd->media_dev.model));
1340         fmd->media_dev.link_notify = fimc_md_link_notify;
1341         fmd->media_dev.dev = dev;
1342
1343         v4l2_dev = &fmd->v4l2_dev;
1344         v4l2_dev->mdev = &fmd->media_dev;
1345         v4l2_dev->notify = fimc_sensor_notify;
1346         strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1347
1348         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1349         fmd->user_subdev_api = true;
1350
1351         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1352         if (ret < 0) {
1353                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1354                 return ret;
1355         }
1356
1357         ret = media_device_register(&fmd->media_dev);
1358         if (ret < 0) {
1359                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
1360                 goto err_v4l2_dev;
1361         }
1362
1363         ret = fimc_md_get_clocks(fmd);
1364         if (ret)
1365                 goto err_md;
1366
1367         ret = fimc_md_get_pinctrl(fmd);
1368         if (ret < 0) {
1369                 if (ret != EPROBE_DEFER)
1370                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1371                 goto err_clk;
1372         }
1373
1374         platform_set_drvdata(pdev, fmd);
1375
1376         /* Protect the media graph while we're registering entities */
1377         mutex_lock(&fmd->media_dev.graph_mutex);
1378
1379         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1380         if (ret) {
1381                 mutex_unlock(&fmd->media_dev.graph_mutex);
1382                 goto err_clk;
1383         }
1384
1385         ret = fimc_md_register_sensor_entities(fmd);
1386         if (ret) {
1387                 mutex_unlock(&fmd->media_dev.graph_mutex);
1388                 goto err_m_ent;
1389         }
1390
1391         mutex_unlock(&fmd->media_dev.graph_mutex);
1392
1393         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1394         if (ret)
1395                 goto err_m_ent;
1396         /*
1397          * FIMC platform devices need to be registered before the sclk_cam
1398          * clocks provider, as one of these devices needs to be activated
1399          * to enable the clock.
1400          */
1401         ret = fimc_md_register_clk_provider(fmd);
1402         if (ret < 0) {
1403                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1404                 goto err_attr;
1405         }
1406
1407         if (fmd->num_sensors > 0) {
1408                 fmd->subdev_notifier.subdevs = fmd->async_subdevs;
1409                 fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
1410                 fmd->subdev_notifier.bound = subdev_notifier_bound;
1411                 fmd->subdev_notifier.complete = subdev_notifier_complete;
1412                 fmd->num_sensors = 0;
1413
1414                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1415                                                 &fmd->subdev_notifier);
1416                 if (ret)
1417                         goto err_clk_p;
1418         }
1419
1420         return 0;
1421
1422 err_clk_p:
1423         fimc_md_unregister_clk_provider(fmd);
1424 err_attr:
1425         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1426 err_clk:
1427         fimc_md_put_clocks(fmd);
1428 err_m_ent:
1429         fimc_md_unregister_entities(fmd);
1430 err_md:
1431         media_device_unregister(&fmd->media_dev);
1432 err_v4l2_dev:
1433         v4l2_device_unregister(&fmd->v4l2_dev);
1434         return ret;
1435 }
1436
1437 static int fimc_md_remove(struct platform_device *pdev)
1438 {
1439         struct fimc_md *fmd = platform_get_drvdata(pdev);
1440
1441         if (!fmd)
1442                 return 0;
1443
1444         fimc_md_unregister_clk_provider(fmd);
1445         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1446
1447         v4l2_device_unregister(&fmd->v4l2_dev);
1448         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1449         fimc_md_unregister_entities(fmd);
1450         fimc_md_pipelines_free(fmd);
1451         media_device_unregister(&fmd->media_dev);
1452         fimc_md_put_clocks(fmd);
1453
1454         return 0;
1455 }
1456
1457 static const struct platform_device_id fimc_driver_ids[] __always_unused = {
1458         { .name = "s5p-fimc-md" },
1459         { },
1460 };
1461 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1462
1463 static const struct of_device_id fimc_md_of_match[] = {
1464         { .compatible = "samsung,fimc" },
1465         { },
1466 };
1467 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1468
1469 static struct platform_driver fimc_md_driver = {
1470         .probe          = fimc_md_probe,
1471         .remove         = fimc_md_remove,
1472         .driver = {
1473                 .of_match_table = of_match_ptr(fimc_md_of_match),
1474                 .name           = "s5p-fimc-md",
1475         }
1476 };
1477
1478 static int __init fimc_md_init(void)
1479 {
1480         int ret;
1481
1482         request_module("s5p-csis");
1483         ret = fimc_register_driver();
1484         if (ret)
1485                 return ret;
1486
1487         return platform_driver_register(&fimc_md_driver);
1488 }
1489
1490 static void __exit fimc_md_exit(void)
1491 {
1492         platform_driver_unregister(&fimc_md_driver);
1493         fimc_unregister_driver();
1494 }
1495
1496 module_init(fimc_md_init);
1497 module_exit(fimc_md_exit);
1498
1499 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1500 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1501 MODULE_LICENSE("GPL");
1502 MODULE_VERSION("2.0.1");