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

   1 /*
   2  * S5P/EXYNOS4 SoC series camera host interface media device driver
   3  *
   4  * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
   5  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 2 of the License,
  10  * or (at your option) any later version.
  11  */
  12
  13 #include <linux/bug.h>
  14 #include <linux/clk.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/device.h>
  17 #include <linux/errno.h>
  18 #include <linux/i2c.h>
  19 #include <linux/kernel.h>
  20 #include <linux/list.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_graph.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <media/v4l2-async.h>
  31 #include <media/v4l2-ctrls.h>
  32 #include <media/v4l2-of.h>
  33 #include <media/media-device.h>
  34 #include <media/drv-intf/exynos-fimc.h>
  35
  36 #include "media-dev.h"
  37 #include "fimc-core.h"
  38 #include "fimc-is.h"
  39 #include "fimc-lite.h"
  40 #include "mipi-csis.h"
  41
  42 /* Set up image sensor subdev -> FIMC capture node notifications. */
  43 static void __setup_sensor_notification(struct fimc_md *fmd,
  44                                         struct v4l2_subdev *sensor,
  45                                         struct v4l2_subdev *fimc_sd)
  46 {
  47         struct fimc_source_info *src_inf;
  48         struct fimc_sensor_info *md_si;
  49         unsigned long flags;
  50
  51         src_inf = v4l2_get_subdev_hostdata(sensor);
  52         if (!src_inf || WARN_ON(fmd == NULL))
  53                 return;
  54
  55         md_si = source_to_sensor_info(src_inf);
  56         spin_lock_irqsave(&fmd->slock, flags);
  57         md_si->host = v4l2_get_subdevdata(fimc_sd);
  58         spin_unlock_irqrestore(&fmd->slock, flags);
  59 }
  60
  61 /**
  62  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  63  * @me: media entity terminating the pipeline
  64  *
  65  * Caller holds the graph mutex.
  66  */
  67 static void fimc_pipeline_prepare(struct fimc_pipeline *p,
  68                                         struct media_entity *me)
  69 {
  70         struct fimc_md *fmd = entity_to_fimc_mdev(me);
  71         struct v4l2_subdev *sd;
  72         struct v4l2_subdev *sensor = NULL;
  73         int i;
  74
  75         for (i = 0; i < IDX_MAX; i++)
  76                 p->subdevs[i] = NULL;
  77
  78         while (1) {
  79                 struct media_pad *pad = NULL;
  80
  81                 /* Find remote source pad */
  82                 for (i = 0; i < me->num_pads; i++) {
  83                         struct media_pad *spad = &me->pads[i];
  84                         if (!(spad->flags & MEDIA_PAD_FL_SINK))
  85                                 continue;
  86                         pad = media_entity_remote_pad(spad);
  87                         if (pad)
  88                                 break;
  89                 }
  90
  91                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
  92                         break;
  93                 sd = media_entity_to_v4l2_subdev(pad->entity);
  94
  95                 switch (sd->grp_id) {
  96                 case GRP_ID_SENSOR:
  97                         sensor = sd;
  98                         /* fall through */
  99                 case GRP_ID_FIMC_IS_SENSOR:
 100                         p->subdevs[IDX_SENSOR] = sd;
 101                         break;
 102                 case GRP_ID_CSIS:
 103                         p->subdevs[IDX_CSIS] = sd;
 104                         break;
 105                 case GRP_ID_FLITE:
 106                         p->subdevs[IDX_FLITE] = sd;
 107                         break;
 108                 case GRP_ID_FIMC:
 109                         p->subdevs[IDX_FIMC] = sd;
 110                         break;
 111                 case GRP_ID_FIMC_IS:
 112                         p->subdevs[IDX_IS_ISP] = sd;
 113                         break;
 114                 default:
 115                         break;
 116                 }
 117                 me = &sd->entity;
 118                 if (me->num_pads == 1)
 119                         break;
 120         }
 121
 122         if (sensor && p->subdevs[IDX_FIMC])
 123                 __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
 124 }
 125
 126 /**
 127  * __subdev_set_power - change power state of a single subdev
 128  * @sd: subdevice to change power state for
 129  * @on: 1 to enable power or 0 to disable
 130  *
 131  * Return result of s_power subdev operation or -ENXIO if sd argument
 132  * is NULL. Return 0 if the subdevice does not implement s_power.
 133  */
 134 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
 135 {
 136         int *use_count;
 137         int ret;
 138
 139         if (sd == NULL)
 140                 return -ENXIO;
 141
 142         use_count = &sd->entity.use_count;
 143         if (on && (*use_count)++ > 0)
 144                 return 0;
 145         else if (!on && (*use_count == 0 || --(*use_count) > 0))
 146                 return 0;
 147         ret = v4l2_subdev_call(sd, core, s_power, on);
 148
 149         return ret != -ENOIOCTLCMD ? ret : 0;
 150 }
 151
 152 /**
 153  * fimc_pipeline_s_power - change power state of all pipeline subdevs
 154  * @fimc: fimc device terminating the pipeline
 155  * @state: true to power on, false to power off
 156  *
 157  * Needs to be called with the graph mutex held.
 158  */
 159 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
 160 {
 161         static const u8 seq[2][IDX_MAX - 1] = {
 162                 { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
 163                 { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
 164         };
 165         int i, ret = 0;
 166
 167         if (p->subdevs[IDX_SENSOR] == NULL)
 168                 return -ENXIO;
 169
 170         for (i = 0; i < IDX_MAX - 1; i++) {
 171                 unsigned int idx = seq[on][i];
 172
 173                 ret = __subdev_set_power(p->subdevs[idx], on);
 174
 175
 176                 if (ret < 0 && ret != -ENXIO)
 177                         goto error;
 178         }
 179         return 0;
 180 error:
 181         for (; i >= 0; i--) {
 182                 unsigned int idx = seq[on][i];
 183                 __subdev_set_power(p->subdevs[idx], !on);
 184         }
 185         return ret;
 186 }
 187
 188 /**
 189  * __fimc_pipeline_enable - enable power of all pipeline subdevs
 190  *                          and the sensor clock
 191  * @ep: video pipeline structure
 192  * @fmd: fimc media device
 193  *
 194  * Called with the graph mutex held.
 195  */
 196 static int __fimc_pipeline_enable(struct exynos_media_pipeline *ep,
 197                                   struct fimc_md *fmd)
 198 {
 199         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 200         int ret;
 201
 202         /* Enable PXLASYNC clock if this pipeline includes FIMC-IS */
 203         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
 204                 ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
 205                 if (ret < 0)
 206                         return ret;
 207         }
 208
 209         ret = fimc_pipeline_s_power(p, 1);
 210         if (!ret)
 211                 return 0;
 212
 213         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 214                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 215
 216         return ret;
 217 }
 218
 219 /**
 220  * __fimc_pipeline_open - update the pipeline information, enable power
 221  *                        of all pipeline subdevs and the sensor clock
 222  * @me: media entity to start graph walk with
 223  * @prepare: true to walk the current pipeline and acquire all subdevs
 224  *
 225  * Called with the graph mutex held.
 226  */
 227 static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
 228                                 struct media_entity *me, bool prepare)
 229 {
 230         struct fimc_md *fmd = entity_to_fimc_mdev(me);
 231         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 232         struct v4l2_subdev *sd;
 233
 234         if (WARN_ON(p == NULL || me == NULL))
 235                 return -EINVAL;
 236
 237         if (prepare)
 238                 fimc_pipeline_prepare(p, me);
 239
 240         sd = p->subdevs[IDX_SENSOR];
 241         if (sd == NULL) {
 242                 pr_warn("%s(): No sensor subdev\n", __func__);
 243                 /*
 244                  * Pipeline open cannot fail so as to make it possible
 245                  * for the user space to configure the pipeline.
 246                  */
 247                 return 0;
 248         }
 249
 250         return __fimc_pipeline_enable(ep, fmd);
 251 }
 252
 253 /**
 254  * __fimc_pipeline_close - disable the sensor clock and pipeline power
 255  * @fimc: fimc device terminating the pipeline
 256  *
 257  * Disable power of all subdevs and turn the external sensor clock off.
 258  */
 259 static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
 260 {
 261         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 262         struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
 263         struct fimc_md *fmd;
 264         int ret;
 265
 266         if (sd == NULL) {
 267                 pr_warn("%s(): No sensor subdev\n", __func__);
 268                 return 0;
 269         }
 270
 271         ret = fimc_pipeline_s_power(p, 0);
 272
 273         fmd = entity_to_fimc_mdev(&sd->entity);
 274
 275         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 276         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 277                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 278
 279         return ret == -ENXIO ? 0 : ret;
 280 }
 281
 282 /**
 283  * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 284  * @pipeline: video pipeline structure
 285  * @on: passed as the s_stream() callback argument
 286  */
 287 static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 288 {
 289         static const u8 seq[2][IDX_MAX] = {
 290                 { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
 291                 { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 292         };
 293         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 294         struct fimc_md *fmd = entity_to_fimc_mdev(&p->subdevs[IDX_CSIS]->entity);
 295         enum fimc_subdev_index sd_id;
 296         int i, ret = 0;
 297
 298         if (p->subdevs[IDX_SENSOR] == NULL) {
 299                 if (!fmd->user_subdev_api) {
 300                         /*
 301                          * Sensor must be already discovered if we
 302                          * aren't in the user_subdev_api mode
 303                          */
 304                         return -ENODEV;
 305                 }
 306
 307                 /* Get pipeline sink entity */
 308                 if (p->subdevs[IDX_FIMC])
 309                         sd_id = IDX_FIMC;
 310                 else if (p->subdevs[IDX_IS_ISP])
 311                         sd_id = IDX_IS_ISP;
 312                 else if (p->subdevs[IDX_FLITE])
 313                         sd_id = IDX_FLITE;
 314                 else
 315                         return -ENODEV;
 316
 317                 /*
 318                  * Sensor could have been linked between open and STREAMON -
 319                  * check if this is the case.
 320                  */
 321                 fimc_pipeline_prepare(p, &p->subdevs[sd_id]->entity);
 322
 323                 if (p->subdevs[IDX_SENSOR] == NULL)
 324                         return -ENODEV;
 325
 326                 ret = __fimc_pipeline_enable(ep, fmd);
 327                 if (ret < 0)
 328                         return ret;
 329
 330         }
 331
 332         for (i = 0; i < IDX_MAX; i++) {
 333                 unsigned int idx = seq[on][i];
 334
 335                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
 336
 337                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 338                         goto error;
 339         }
 340
 341         return 0;
 342 error:
 343         fimc_pipeline_s_power(p, !on);
 344         for (; i >= 0; i--) {
 345                 unsigned int idx = seq[on][i];
 346                 v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
 347         }
 348         return ret;
 349 }
 350
 351 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
 352 static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
 353         .open           = __fimc_pipeline_open,
 354         .close          = __fimc_pipeline_close,
 355         .set_stream     = __fimc_pipeline_s_stream,
 356 };
 357
 358 static struct exynos_media_pipeline *fimc_md_pipeline_create(
 359                                                 struct fimc_md *fmd)
 360 {
 361         struct fimc_pipeline *p;
 362
 363         p = kzalloc(sizeof(*p), GFP_KERNEL);
 364         if (!p)
 365                 return NULL;
 366
 367         list_add_tail(&p->list, &fmd->pipelines);
 368
 369         p->ep.ops = &fimc_pipeline_ops;
 370         return &p->ep;
 371 }
 372
 373 static void fimc_md_pipelines_free(struct fimc_md *fmd)
 374 {
 375         while (!list_empty(&fmd->pipelines)) {
 376                 struct fimc_pipeline *p;
 377
 378                 p = list_entry(fmd->pipelines.next, typeof(*p), list);
 379                 list_del(&p->list);
 380                 kfree(p);
 381         }
 382 }
 383
 384 /* Parse port node and register as a sub-device any sensor specified there. */
 385 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 386                                    struct device_node *port,
 387                                    unsigned int index)
 388 {
 389         struct fimc_source_info *pd = &fmd->sensor[index].pdata;
 390         struct device_node *rem, *ep, *np;
 391         struct v4l2_of_endpoint endpoint;
 392
 393         /* Assume here a port node can have only one endpoint node. */
 394         ep = of_get_next_child(port, NULL);
 395         if (!ep)
 396                 return 0;
 397
 398         v4l2_of_parse_endpoint(ep, &endpoint);
 399         if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
 400                 return -EINVAL;
 401
 402         pd->mux_id = (endpoint.base.port - 1) & 0x1;
 403
 404         rem = of_graph_get_remote_port_parent(ep);
 405         of_node_put(ep);
 406         if (rem == NULL) {
 407                 v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
 408                                                         ep->full_name);
 409                 return 0;
 410         }
 411
 412         if (fimc_input_is_parallel(endpoint.base.port)) {
 413                 if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
 414                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
 415                 else
 416                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
 417                 pd->flags = endpoint.bus.parallel.flags;
 418         } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
 419                 /*
 420                  * MIPI CSI-2: only input mux selection and
 421                  * the sensor's clock frequency is needed.
 422                  */
 423                 pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
 424         } else {
 425                 v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
 426                          endpoint.base.port, rem->full_name);
 427         }
 428         /*
 429          * For FIMC-IS handled sensors, that are placed under i2c-isp device
 430          * node, FIMC is connected to the FIMC-IS through its ISP Writeback
 431          * input. Sensors are attached to the FIMC-LITE hostdata interface
 432          * directly or through MIPI-CSIS, depending on the external media bus
 433          * used. This needs to be handled in a more reliable way, not by just
 434          * checking parent's node name.
 435          */
 436         np = of_get_parent(rem);
 437
 438         if (np && !of_node_cmp(np->name, "i2c-isp"))
 439                 pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
 440         else
 441                 pd->fimc_bus_type = pd->sensor_bus_type;
 442
 443         if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor)))
 444                 return -EINVAL;
 445
 446         fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
 447         fmd->sensor[index].asd.match.of.node = rem;
 448         fmd->async_subdevs[index] = &fmd->sensor[index].asd;
 449
 450         fmd->num_sensors++;
 451
 452         of_node_put(rem);
 453         return 0;
 454 }
 455
 456 /* Register all SoC external sub-devices */
 457 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 458 {
 459         struct device_node *parent = fmd->pdev->dev.of_node;
 460         struct device_node *node, *ports;
 461         int index = 0;
 462         int ret;
 463
 464         /*
 465          * Runtime resume one of the FIMC entities to make sure
 466          * the sclk_cam clocks are not globally disabled.
 467          */
 468         if (!fmd->pmf)
 469                 return -ENXIO;
 470
 471         ret = pm_runtime_get_sync(fmd->pmf);
 472         if (ret < 0)
 473                 return ret;
 474
 475         fmd->num_sensors = 0;
 476
 477         /* Attach sensors linked to MIPI CSI-2 receivers */
 478         for_each_available_child_of_node(parent, node) {
 479                 struct device_node *port;
 480
 481                 if (of_node_cmp(node->name, "csis"))
 482                         continue;
 483                 /* The csis node can have only port subnode. */
 484                 port = of_get_next_child(node, NULL);
 485                 if (!port)
 486                         continue;
 487
 488                 ret = fimc_md_parse_port_node(fmd, port, index);
 489                 if (ret < 0)
 490                         goto rpm_put;
 491                 index++;
 492         }
 493
 494         /* Attach sensors listed in the parallel-ports node */
 495         ports = of_get_child_by_name(parent, "parallel-ports");
 496         if (!ports)
 497                 goto rpm_put;
 498
 499         for_each_child_of_node(ports, node) {
 500                 ret = fimc_md_parse_port_node(fmd, node, index);
 501                 if (ret < 0)
 502                         break;
 503                 index++;
 504         }
 505 rpm_put:
 506         pm_runtime_put(fmd->pmf);
 507         return ret;
 508 }
 509
 510 static int __of_get_csis_id(struct device_node *np)
 511 {
 512         u32 reg = 0;
 513
 514         np = of_get_child_by_name(np, "port");
 515         if (!np)
 516                 return -EINVAL;
 517         of_property_read_u32(np, "reg", &reg);
 518         return reg - FIMC_INPUT_MIPI_CSI2_0;
 519 }
 520
 521 /*
 522  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 523  */
 524 static int register_fimc_lite_entity(struct fimc_md *fmd,
 525                                      struct fimc_lite *fimc_lite)
 526 {
 527         struct v4l2_subdev *sd;
 528         struct exynos_media_pipeline *ep;
 529         int ret;
 530
 531         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 532                     fmd->fimc_lite[fimc_lite->index]))
 533                 return -EBUSY;
 534
 535         sd = &fimc_lite->subdev;
 536         sd->grp_id = GRP_ID_FLITE;
 537
 538         ep = fimc_md_pipeline_create(fmd);
 539         if (!ep)
 540                 return -ENOMEM;
 541
 542         v4l2_set_subdev_hostdata(sd, ep);
 543
 544         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 545         if (!ret)
 546                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 547         else
 548                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 549                          fimc_lite->index);
 550         return ret;
 551 }
 552
 553 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 554 {
 555         struct v4l2_subdev *sd;
 556         struct exynos_media_pipeline *ep;
 557         int ret;
 558
 559         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 560                 return -EBUSY;
 561
 562         sd = &fimc->vid_cap.subdev;
 563         sd->grp_id = GRP_ID_FIMC;
 564
 565         ep = fimc_md_pipeline_create(fmd);
 566         if (!ep)
 567                 return -ENOMEM;
 568
 569         v4l2_set_subdev_hostdata(sd, ep);
 570
 571         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 572         if (!ret) {
 573                 if (!fmd->pmf && fimc->pdev)
 574                         fmd->pmf = &fimc->pdev->dev;
 575                 fmd->fimc[fimc->id] = fimc;
 576                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 577         } else {
 578                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 579                          fimc->id, ret);
 580         }
 581         return ret;
 582 }
 583
 584 static int register_csis_entity(struct fimc_md *fmd,
 585                                 struct platform_device *pdev,
 586                                 struct v4l2_subdev *sd)
 587 {
 588         struct device_node *node = pdev->dev.of_node;
 589         int id, ret;
 590
 591         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 592
 593         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 594                 return -ENOENT;
 595
 596         if (WARN_ON(fmd->csis[id].sd))
 597                 return -EBUSY;
 598
 599         sd->grp_id = GRP_ID_CSIS;
 600         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 601         if (!ret)
 602                 fmd->csis[id].sd = sd;
 603         else
 604                 v4l2_err(&fmd->v4l2_dev,
 605                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 606         return ret;
 607 }
 608
 609 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 610 {
 611         struct v4l2_subdev *sd = &is->isp.subdev;
 612         struct exynos_media_pipeline *ep;
 613         int ret;
 614
 615         /* Allocate pipeline object for the ISP capture video node. */
 616         ep = fimc_md_pipeline_create(fmd);
 617         if (!ep)
 618                 return -ENOMEM;
 619
 620         v4l2_set_subdev_hostdata(sd, ep);
 621
 622         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 623         if (ret) {
 624                 v4l2_err(&fmd->v4l2_dev,
 625                          "Failed to register FIMC-ISP (%d)\n", ret);
 626                 return ret;
 627         }
 628
 629         fmd->fimc_is = is;
 630         return 0;
 631 }
 632
 633 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 634                                             struct platform_device *pdev,
 635                                             int plat_entity)
 636 {
 637         struct device *dev = &pdev->dev;
 638         int ret = -EPROBE_DEFER;
 639         void *drvdata;
 640
 641         /* Lock to ensure dev->driver won't change. */
 642         device_lock(dev);
 643
 644         if (!dev->driver || !try_module_get(dev->driver->owner))
 645                 goto dev_unlock;
 646
 647         drvdata = dev_get_drvdata(dev);
 648         /* Some subdev didn't probe successfully id drvdata is NULL */
 649         if (drvdata) {
 650                 switch (plat_entity) {
 651                 case IDX_FIMC:
 652                         ret = register_fimc_entity(fmd, drvdata);
 653                         break;
 654                 case IDX_FLITE:
 655                         ret = register_fimc_lite_entity(fmd, drvdata);
 656                         break;
 657                 case IDX_CSIS:
 658                         ret = register_csis_entity(fmd, pdev, drvdata);
 659                         break;
 660                 case IDX_IS_ISP:
 661                         ret = register_fimc_is_entity(fmd, drvdata);
 662                         break;
 663                 default:
 664                         ret = -ENODEV;
 665                 }
 666         }
 667
 668         module_put(dev->driver->owner);
 669 dev_unlock:
 670         device_unlock(dev);
 671         if (ret == -EPROBE_DEFER)
 672                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 673                         dev_name(dev));
 674         else if (ret < 0)
 675                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 676                         dev_name(dev), ret);
 677         return ret;
 678 }
 679
 680 /* Register FIMC, FIMC-LITE and CSIS media entities */
 681 static int fimc_md_register_platform_entities(struct fimc_md *fmd,
 682                                               struct device_node *parent)
 683 {
 684         struct device_node *node;
 685         int ret = 0;
 686
 687         for_each_available_child_of_node(parent, node) {
 688                 struct platform_device *pdev;
 689                 int plat_entity = -1;
 690
 691                 pdev = of_find_device_by_node(node);
 692                 if (!pdev)
 693                         continue;
 694
 695                 /* If driver of any entity isn't ready try all again later. */
 696                 if (!strcmp(node->name, CSIS_OF_NODE_NAME))
 697                         plat_entity = IDX_CSIS;
 698                 else if (!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
 699                         plat_entity = IDX_IS_ISP;
 700                 else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
 701                         plat_entity = IDX_FLITE;
 702                 else if (!strcmp(node->name, FIMC_OF_NODE_NAME) &&
 703                          !of_property_read_bool(node, "samsung,lcd-wb"))
 704                         plat_entity = IDX_FIMC;
 705
 706                 if (plat_entity >= 0)
 707                         ret = fimc_md_register_platform_entity(fmd, pdev,
 708                                                         plat_entity);
 709                 put_device(&pdev->dev);
 710                 if (ret < 0)
 711                         break;
 712         }
 713
 714         return ret;
 715 }
 716
 717 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 718 {
 719         int i;
 720
 721         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 722                 struct fimc_dev *dev = fmd->fimc[i];
 723                 if (dev == NULL)
 724                         continue;
 725                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 726                 dev->vid_cap.ve.pipe = NULL;
 727                 fmd->fimc[i] = NULL;
 728         }
 729         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 730                 struct fimc_lite *dev = fmd->fimc_lite[i];
 731                 if (dev == NULL)
 732                         continue;
 733                 v4l2_device_unregister_subdev(&dev->subdev);
 734                 dev->ve.pipe = NULL;
 735                 fmd->fimc_lite[i] = NULL;
 736         }
 737         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 738                 if (fmd->csis[i].sd == NULL)
 739                         continue;
 740                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 741                 fmd->csis[i].sd = NULL;
 742         }
 743
 744         if (fmd->fimc_is)
 745                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 746
 747         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 748 }
 749
 750 /**
 751  * __fimc_md_create_fimc_links - create links to all FIMC entities
 752  * @fmd: fimc media device
 753  * @source: the source entity to create links to all fimc entities from
 754  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 755  * @pad: the source entity pad index
 756  * @link_mask: bitmask of the fimc devices for which link should be enabled
 757  */
 758 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 759                                             struct media_entity *source,
 760                                             struct v4l2_subdev *sensor,
 761                                             int pad, int link_mask)
 762 {
 763         struct fimc_source_info *si = NULL;
 764         struct media_entity *sink;
 765         unsigned int flags = 0;
 766         int i, ret = 0;
 767
 768         if (sensor) {
 769                 si = v4l2_get_subdev_hostdata(sensor);
 770                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 771                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 772                         ret = 1;
 773         }
 774
 775         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 776                 if (!fmd->fimc[i])
 777                         continue;
 778                 /*
 779                  * Some FIMC variants are not fitted with camera capture
 780                  * interface. Skip creating a link from sensor for those.
 781                  */
 782                 if (!fmd->fimc[i]->variant->has_cam_if)
 783                         continue;
 784
 785                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 786
 787                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 788                 ret = media_create_pad_link(source, pad, sink,
 789                                               FIMC_SD_PAD_SINK_CAM, flags);
 790                 if (ret)
 791                         return ret;
 792
 793                 /* Notify FIMC capture subdev entity */
 794                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 795                                         &source->pads[pad], flags);
 796                 if (ret)
 797                         break;
 798
 799                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 800                           source->name, flags ? '=' : '-', sink->name);
 801         }
 802
 803         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 804                 if (!fmd->fimc_lite[i])
 805                         continue;
 806
 807                 sink = &fmd->fimc_lite[i]->subdev.entity;
 808                 ret = media_create_pad_link(source, pad, sink,
 809                                                FLITE_SD_PAD_SINK, 0);
 810                 if (ret)
 811                         return ret;
 812
 813                 /* Notify FIMC-LITE subdev entity */
 814                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 815                                         &source->pads[pad], 0);
 816                 if (ret)
 817                         break;
 818
 819                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 820                           source->name, sink->name);
 821         }
 822         return 0;
 823 }
 824
 825 /* Create links from FIMC-LITE source pads to other entities */
 826 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 827 {
 828         struct media_entity *source, *sink;
 829         int i, ret = 0;
 830
 831         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 832                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 833
 834                 if (fimc == NULL)
 835                         continue;
 836
 837                 source = &fimc->subdev.entity;
 838                 sink = &fimc->ve.vdev.entity;
 839                 /* FIMC-LITE's subdev and video node */
 840                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
 841                                                sink, 0, 0);
 842                 if (ret)
 843                         break;
 844                 /* Link from FIMC-LITE to IS-ISP subdev */
 845                 sink = &fmd->fimc_is->isp.subdev.entity;
 846                 ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
 847                                                sink, 0, 0);
 848                 if (ret)
 849                         break;
 850         }
 851
 852         return ret;
 853 }
 854
 855 /* Create FIMC-IS links */
 856 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
 857 {
 858         struct fimc_isp *isp = &fmd->fimc_is->isp;
 859         struct media_entity *source, *sink;
 860         int i, ret;
 861
 862         source = &isp->subdev.entity;
 863
 864         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 865                 if (fmd->fimc[i] == NULL)
 866                         continue;
 867
 868                 /* Link from FIMC-IS-ISP subdev to FIMC */
 869                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 870                 ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
 871                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
 872                 if (ret)
 873                         return ret;
 874         }
 875
 876         /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
 877         sink = &isp->video_capture.ve.vdev.entity;
 878
 879         /* Skip this link if the fimc-is-isp video node driver isn't built-in */
 880         if (sink->num_pads == 0)
 881                 return 0;
 882
 883         return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
 884                                         sink, 0, 0);
 885 }
 886
 887 /**
 888  * fimc_md_create_links - create default links between registered entities
 889  *
 890  * Parallel interface sensor entities are connected directly to FIMC capture
 891  * entities. The sensors using MIPI CSIS bus are connected through immutable
 892  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 893  * entity has a link to each registered FIMC capture entity. Enabled links
 894  * are created by default between each subsequent registered sensor and
 895  * subsequent FIMC capture entity. The number of default active links is
 896  * determined by the number of available sensors or FIMC entities,
 897  * whichever is less.
 898  */
 899 static int fimc_md_create_links(struct fimc_md *fmd)
 900 {
 901         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
 902         struct v4l2_subdev *sensor, *csis;
 903         struct fimc_source_info *pdata;
 904         struct media_entity *source, *sink;
 905         int i, pad, fimc_id = 0, ret = 0;
 906         u32 flags, link_mask = 0;
 907
 908         for (i = 0; i < fmd->num_sensors; i++) {
 909                 if (fmd->sensor[i].subdev == NULL)
 910                         continue;
 911
 912                 sensor = fmd->sensor[i].subdev;
 913                 pdata = v4l2_get_subdev_hostdata(sensor);
 914                 if (!pdata)
 915                         continue;
 916
 917                 source = NULL;
 918
 919                 switch (pdata->sensor_bus_type) {
 920                 case FIMC_BUS_TYPE_MIPI_CSI2:
 921                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 922                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 923                                 return -EINVAL;
 924
 925                         csis = fmd->csis[pdata->mux_id].sd;
 926                         if (WARN(csis == NULL,
 927                                  "MIPI-CSI interface specified "
 928                                  "but s5p-csis module is not loaded!\n"))
 929                                 return -EINVAL;
 930
 931                         pad = sensor->entity.num_pads - 1;
 932                         ret = media_create_pad_link(&sensor->entity, pad,
 933                                               &csis->entity, CSIS_PAD_SINK,
 934                                               MEDIA_LNK_FL_IMMUTABLE |
 935                                               MEDIA_LNK_FL_ENABLED);
 936                         if (ret)
 937                                 return ret;
 938
 939                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
 940                                   sensor->entity.name, csis->entity.name);
 941
 942                         source = NULL;
 943                         csi_sensors[pdata->mux_id] = sensor;
 944                         break;
 945
 946                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
 947                         source = &sensor->entity;
 948                         pad = 0;
 949                         break;
 950
 951                 default:
 952                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 953                                  pdata->sensor_bus_type);
 954                         return -EINVAL;
 955                 }
 956                 if (source == NULL)
 957                         continue;
 958
 959                 link_mask = 1 << fimc_id++;
 960                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 961                                                        pad, link_mask);
 962         }
 963
 964         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 965                 if (fmd->csis[i].sd == NULL)
 966                         continue;
 967
 968                 source = &fmd->csis[i].sd->entity;
 969                 pad = CSIS_PAD_SOURCE;
 970                 sensor = csi_sensors[i];
 971
 972                 link_mask = 1 << fimc_id++;
 973                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
 974                                                        pad, link_mask);
 975         }
 976
 977         /* Create immutable links between each FIMC's subdev and video node */
 978         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 979         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 980                 if (!fmd->fimc[i])
 981                         continue;
 982
 983                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
 984                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
 985
 986                 ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
 987                                               sink, 0, flags);
 988                 if (ret)
 989                         break;
 990         }
 991
 992         ret = __fimc_md_create_flite_source_links(fmd);
 993         if (ret < 0)
 994                 return ret;
 995
 996         if (fmd->use_isp)
 997                 ret = __fimc_md_create_fimc_is_links(fmd);
 998
 999         return ret;
1000 }
1001
1002 /*
1003  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
1004  */
1005 static void fimc_md_put_clocks(struct fimc_md *fmd)
1006 {
1007         int i = FIMC_MAX_CAMCLKS;
1008
1009         while (--i >= 0) {
1010                 if (IS_ERR(fmd->camclk[i].clock))
1011                         continue;
1012                 clk_put(fmd->camclk[i].clock);
1013                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1014         }
1015
1016         /* Writeback (PIXELASYNCMx) clocks */
1017         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
1018                 if (IS_ERR(fmd->wbclk[i]))
1019                         continue;
1020                 clk_put(fmd->wbclk[i]);
1021                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
1022         }
1023 }
1024
1025 static int fimc_md_get_clocks(struct fimc_md *fmd)
1026 {
1027         struct device *dev = &fmd->pdev->dev;
1028         char clk_name[32];
1029         struct clk *clock;
1030         int i, ret = 0;
1031
1032         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
1033                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1034
1035         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1036                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
1037                 clock = clk_get(dev, clk_name);
1038
1039                 if (IS_ERR(clock)) {
1040                         dev_err(dev, "Failed to get clock: %s\n", clk_name);
1041                         ret = PTR_ERR(clock);
1042                         break;
1043                 }
1044                 fmd->camclk[i].clock = clock;
1045         }
1046         if (ret)
1047                 fimc_md_put_clocks(fmd);
1048
1049         if (!fmd->use_isp)
1050                 return 0;
1051         /*
1052          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
1053          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1054          */
1055         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1056
1057         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1058                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1059                 clock = clk_get(dev, clk_name);
1060                 if (IS_ERR(clock)) {
1061                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1062                                   clk_name);
1063                         ret = PTR_ERR(clock);
1064                         break;
1065                 }
1066                 fmd->wbclk[i] = clock;
1067         }
1068         if (ret)
1069                 fimc_md_put_clocks(fmd);
1070
1071         return ret;
1072 }
1073
1074 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1075 {
1076         struct exynos_video_entity *ve;
1077         struct fimc_pipeline *p;
1078         struct video_device *vdev;
1079         int ret;
1080
1081         vdev = media_entity_to_video_device(entity);
1082         if (vdev->entity.use_count == 0)
1083                 return 0;
1084
1085         ve = vdev_to_exynos_video_entity(vdev);
1086         p = to_fimc_pipeline(ve->pipe);
1087         /*
1088          * Nothing to do if we are disabling the pipeline, some link
1089          * has been disconnected and p->subdevs array is cleared now.
1090          */
1091         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1092                 return 0;
1093
1094         if (enable)
1095                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1096         else
1097                 ret = __fimc_pipeline_close(ve->pipe);
1098
1099         if (ret == 0 && !enable)
1100                 memset(p->subdevs, 0, sizeof(p->subdevs));
1101
1102         return ret;
1103 }
1104
1105 /* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
1106 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
1107                                       struct media_entity_graph *graph)
1108 {
1109         struct media_entity *entity_err = entity;
1110         int ret;
1111
1112         /*
1113          * Walk current graph and call the pipeline open/close routine for each
1114          * opened video node that belongs to the graph of entities connected
1115          * through active links. This is needed as we cannot power on/off the
1116          * subdevs in random order.
1117          */
1118         media_entity_graph_walk_start(graph, entity);
1119
1120         while ((entity = media_entity_graph_walk_next(graph))) {
1121                 if (!is_media_entity_v4l2_io(entity))
1122                         continue;
1123
1124                 ret  = __fimc_md_modify_pipeline(entity, enable);
1125
1126                 if (ret < 0)
1127                         goto err;
1128         }
1129
1130         return 0;
1131
1132 err:
1133         media_entity_graph_walk_start(graph, entity_err);
1134
1135         while ((entity_err = media_entity_graph_walk_next(graph))) {
1136                 if (!is_media_entity_v4l2_io(entity_err))
1137                         continue;
1138
1139                 __fimc_md_modify_pipeline(entity_err, !enable);
1140
1141                 if (entity_err == entity)
1142                         break;
1143         }
1144
1145         return ret;
1146 }
1147
1148 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1149                                 unsigned int notification)
1150 {
1151         struct media_entity_graph *graph =
1152                 &container_of(link->graph_obj.mdev, struct fimc_md,
1153                               media_dev)->link_setup_graph;
1154         struct media_entity *sink = link->sink->entity;
1155         int ret = 0;
1156
1157         /* Before link disconnection */
1158         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1159                 ret = media_entity_graph_walk_init(graph,
1160                                                    link->graph_obj.mdev);
1161                 if (ret)
1162                         return ret;
1163                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1164                         ret = __fimc_md_modify_pipelines(sink, false, graph);
1165 #if 0
1166                 else
1167                         /* TODO: Link state change validation */
1168 #endif
1169         /* After link activation */
1170         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
1171                 if (link->flags & MEDIA_LNK_FL_ENABLED)
1172                         ret = __fimc_md_modify_pipelines(sink, true, graph);
1173                 media_entity_graph_walk_cleanup(graph);
1174         }
1175
1176         return ret ? -EPIPE : 0;
1177 }
1178
1179 static ssize_t fimc_md_sysfs_show(struct device *dev,
1180                                   struct device_attribute *attr, char *buf)
1181 {
1182         struct platform_device *pdev = to_platform_device(dev);
1183         struct fimc_md *fmd = platform_get_drvdata(pdev);
1184
1185         if (fmd->user_subdev_api)
1186                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1187
1188         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1189 }
1190
1191 static ssize_t fimc_md_sysfs_store(struct device *dev,
1192                                    struct device_attribute *attr,
1193                                    const char *buf, size_t count)
1194 {
1195         struct platform_device *pdev = to_platform_device(dev);
1196         struct fimc_md *fmd = platform_get_drvdata(pdev);
1197         bool subdev_api;
1198         int i;
1199
1200         if (!strcmp(buf, "vid-dev\n"))
1201                 subdev_api = false;
1202         else if (!strcmp(buf, "sub-dev\n"))
1203                 subdev_api = true;
1204         else
1205                 return count;
1206
1207         fmd->user_subdev_api = subdev_api;
1208         for (i = 0; i < FIMC_MAX_DEVS; i++)
1209                 if (fmd->fimc[i])
1210                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1211         return count;
1212 }
1213 /*
1214  * This device attribute is to select video pipeline configuration method.
1215  * There are following valid values:
1216  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1217  *  by the host driver.
1218  *  sub-dev - for media controller API, subdevs must be configured in user
1219  *  space before starting streaming.
1220  */
1221 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1222                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1223
1224 static int fimc_md_get_pinctrl(struct fimc_md *fmd)
1225 {
1226         struct device *dev = &fmd->pdev->dev;
1227         struct fimc_pinctrl *pctl = &fmd->pinctl;
1228
1229         pctl->pinctrl = devm_pinctrl_get(dev);
1230         if (IS_ERR(pctl->pinctrl))
1231                 return PTR_ERR(pctl->pinctrl);
1232
1233         pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
1234                                         PINCTRL_STATE_DEFAULT);
1235         if (IS_ERR(pctl->state_default))
1236                 return PTR_ERR(pctl->state_default);
1237
1238         pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
1239                                         PINCTRL_STATE_IDLE);
1240         return 0;
1241 }
1242
1243 static int cam_clk_prepare(struct clk_hw *hw)
1244 {
1245         struct cam_clk *camclk = to_cam_clk(hw);
1246         int ret;
1247
1248         if (camclk->fmd->pmf == NULL)
1249                 return -ENODEV;
1250
1251         ret = pm_runtime_get_sync(camclk->fmd->pmf);
1252         return ret < 0 ? ret : 0;
1253 }
1254
1255 static void cam_clk_unprepare(struct clk_hw *hw)
1256 {
1257         struct cam_clk *camclk = to_cam_clk(hw);
1258
1259         if (camclk->fmd->pmf == NULL)
1260                 return;
1261
1262         pm_runtime_put_sync(camclk->fmd->pmf);
1263 }
1264
1265 static const struct clk_ops cam_clk_ops = {
1266         .prepare = cam_clk_prepare,
1267         .unprepare = cam_clk_unprepare,
1268 };
1269
1270 static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
1271 {
1272         struct cam_clk_provider *cp = &fmd->clk_provider;
1273         unsigned int i;
1274
1275         if (cp->of_node)
1276                 of_clk_del_provider(cp->of_node);
1277
1278         for (i = 0; i < cp->num_clocks; i++)
1279                 clk_unregister(cp->clks[i]);
1280 }
1281
1282 static int fimc_md_register_clk_provider(struct fimc_md *fmd)
1283 {
1284         struct cam_clk_provider *cp = &fmd->clk_provider;
1285         struct device *dev = &fmd->pdev->dev;
1286         int i, ret;
1287
1288         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1289                 struct cam_clk *camclk = &cp->camclk[i];
1290                 struct clk_init_data init;
1291                 const char *p_name;
1292
1293                 ret = of_property_read_string_index(dev->of_node,
1294                                         "clock-output-names", i, &init.name);
1295                 if (ret < 0)
1296                         break;
1297
1298                 p_name = __clk_get_name(fmd->camclk[i].clock);
1299
1300                 /* It's safe since clk_register() will duplicate the string. */
1301                 init.parent_names = &p_name;
1302                 init.num_parents = 1;
1303                 init.ops = &cam_clk_ops;
1304                 init.flags = CLK_SET_RATE_PARENT;
1305                 camclk->hw.init = &init;
1306                 camclk->fmd = fmd;
1307
1308                 cp->clks[i] = clk_register(NULL, &camclk->hw);
1309                 if (IS_ERR(cp->clks[i])) {
1310                         dev_err(dev, "failed to register clock: %s (%ld)\n",
1311                                         init.name, PTR_ERR(cp->clks[i]));
1312                         ret = PTR_ERR(cp->clks[i]);
1313                         goto err;
1314                 }
1315                 cp->num_clocks++;
1316         }
1317
1318         if (cp->num_clocks == 0) {
1319                 dev_warn(dev, "clk provider not registered\n");
1320                 return 0;
1321         }
1322
1323         cp->clk_data.clks = cp->clks;
1324         cp->clk_data.clk_num = cp->num_clocks;
1325         cp->of_node = dev->of_node;
1326         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
1327                                   &cp->clk_data);
1328         if (ret == 0)
1329                 return 0;
1330 err:
1331         fimc_md_unregister_clk_provider(fmd);
1332         return ret;
1333 }
1334
1335 static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
1336                                  struct v4l2_subdev *subdev,
1337                                  struct v4l2_async_subdev *asd)
1338 {
1339         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1340         struct fimc_sensor_info *si = NULL;
1341         int i;
1342
1343         /* Find platform data for this sensor subdev */
1344         for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
1345                 if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
1346                         si = &fmd->sensor[i];
1347
1348         if (si == NULL)
1349                 return -EINVAL;
1350
1351         v4l2_set_subdev_hostdata(subdev, &si->pdata);
1352
1353         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
1354                 subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
1355         else
1356                 subdev->grp_id = GRP_ID_SENSOR;
1357
1358         si->subdev = subdev;
1359
1360         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
1361                   subdev->name, fmd->num_sensors);
1362
1363         fmd->num_sensors++;
1364
1365         return 0;
1366 }
1367
1368 static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
1369 {
1370         struct fimc_md *fmd = notifier_to_fimc_md(notifier);
1371         int ret;
1372
1373         mutex_lock(&fmd->media_dev.graph_mutex);
1374
1375         ret = fimc_md_create_links(fmd);
1376         if (ret < 0)
1377                 goto unlock;
1378
1379         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1380 unlock:
1381         mutex_unlock(&fmd->media_dev.graph_mutex);
1382         if (ret < 0)
1383                 return ret;
1384
1385         return media_device_register(&fmd->media_dev);
1386 }
1387
1388 static int fimc_md_probe(struct platform_device *pdev)
1389 {
1390         struct device *dev = &pdev->dev;
1391         struct v4l2_device *v4l2_dev;
1392         struct fimc_md *fmd;
1393         int ret;
1394
1395         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1396         if (!fmd)
1397                 return -ENOMEM;
1398
1399         spin_lock_init(&fmd->slock);
1400         INIT_LIST_HEAD(&fmd->pipelines);
1401         fmd->pdev = pdev;
1402
1403         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
1404                 sizeof(fmd->media_dev.model));
1405         fmd->media_dev.link_notify = fimc_md_link_notify;
1406         fmd->media_dev.dev = dev;
1407
1408         v4l2_dev = &fmd->v4l2_dev;
1409         v4l2_dev->mdev = &fmd->media_dev;
1410         v4l2_dev->notify = fimc_sensor_notify;
1411         strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1412
1413         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1414         fmd->user_subdev_api = true;
1415
1416         media_device_init(&fmd->media_dev);
1417
1418         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1419         if (ret < 0) {
1420                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1421                 return ret;
1422         }
1423
1424         ret = fimc_md_get_clocks(fmd);
1425         if (ret)
1426                 goto err_md;
1427
1428         ret = fimc_md_get_pinctrl(fmd);
1429         if (ret < 0) {
1430                 if (ret != EPROBE_DEFER)
1431                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1432                 goto err_clk;
1433         }
1434
1435         platform_set_drvdata(pdev, fmd);
1436
1437         /* Protect the media graph while we're registering entities */
1438         mutex_lock(&fmd->media_dev.graph_mutex);
1439
1440         ret = fimc_md_register_platform_entities(fmd, dev->of_node);
1441         if (ret) {
1442                 mutex_unlock(&fmd->media_dev.graph_mutex);
1443                 goto err_clk;
1444         }
1445
1446         ret = fimc_md_register_sensor_entities(fmd);
1447         if (ret) {
1448                 mutex_unlock(&fmd->media_dev.graph_mutex);
1449                 goto err_m_ent;
1450         }
1451
1452         mutex_unlock(&fmd->media_dev.graph_mutex);
1453
1454         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1455         if (ret)
1456                 goto err_m_ent;
1457         /*
1458          * FIMC platform devices need to be registered before the sclk_cam
1459          * clocks provider, as one of these devices needs to be activated
1460          * to enable the clock.
1461          */
1462         ret = fimc_md_register_clk_provider(fmd);
1463         if (ret < 0) {
1464                 v4l2_err(v4l2_dev, "clock provider registration failed\n");
1465                 goto err_attr;
1466         }
1467
1468         if (fmd->num_sensors > 0) {
1469                 fmd->subdev_notifier.subdevs = fmd->async_subdevs;
1470                 fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
1471                 fmd->subdev_notifier.bound = subdev_notifier_bound;
1472                 fmd->subdev_notifier.complete = subdev_notifier_complete;
1473                 fmd->num_sensors = 0;
1474
1475                 ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
1476                                                 &fmd->subdev_notifier);
1477                 if (ret)
1478                         goto err_clk_p;
1479         }
1480
1481         return 0;
1482
1483 err_clk_p:
1484         fimc_md_unregister_clk_provider(fmd);
1485 err_attr:
1486         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1487 err_clk:
1488         fimc_md_put_clocks(fmd);
1489 err_m_ent:
1490         fimc_md_unregister_entities(fmd);
1491 err_md:
1492         media_device_cleanup(&fmd->media_dev);
1493         v4l2_device_unregister(&fmd->v4l2_dev);
1494         return ret;
1495 }
1496
1497 static int fimc_md_remove(struct platform_device *pdev)
1498 {
1499         struct fimc_md *fmd = platform_get_drvdata(pdev);
1500
1501         if (!fmd)
1502                 return 0;
1503
1504         fimc_md_unregister_clk_provider(fmd);
1505         v4l2_async_notifier_unregister(&fmd->subdev_notifier);
1506
1507         v4l2_device_unregister(&fmd->v4l2_dev);
1508         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1509         fimc_md_unregister_entities(fmd);
1510         fimc_md_pipelines_free(fmd);
1511         media_device_unregister(&fmd->media_dev);
1512         media_device_cleanup(&fmd->media_dev);
1513         fimc_md_put_clocks(fmd);
1514
1515         return 0;
1516 }
1517
1518 static const struct platform_device_id fimc_driver_ids[] __always_unused = {
1519         { .name = "s5p-fimc-md" },
1520         { },
1521 };
1522 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1523
1524 static const struct of_device_id fimc_md_of_match[] = {
1525         { .compatible = "samsung,fimc" },
1526         { },
1527 };
1528 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1529
1530 static struct platform_driver fimc_md_driver = {
1531         .probe          = fimc_md_probe,
1532         .remove         = fimc_md_remove,
1533         .driver = {
1534                 .of_match_table = of_match_ptr(fimc_md_of_match),
1535                 .name           = "s5p-fimc-md",
1536         }
1537 };
1538
1539 static int __init fimc_md_init(void)
1540 {
1541         int ret;
1542
1543         request_module("s5p-csis");
1544         ret = fimc_register_driver();
1545         if (ret)
1546                 return ret;
1547
1548         return platform_driver_register(&fimc_md_driver);
1549 }
1550
1551 static void __exit fimc_md_exit(void)
1552 {
1553         platform_driver_unregister(&fimc_md_driver);
1554         fimc_unregister_driver();
1555 }
1556
1557 module_init(fimc_md_init);
1558 module_exit(fimc_md_exit);
1559
1560 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1561 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1562 MODULE_LICENSE("GPL");
1563 MODULE_VERSION("2.0.1");