drivers/media/video/s5p-fimc/fimc-mdevice.c

   1 /*
   2  * S5P/EXYNOS4 SoC series camera host interface media device driver
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   5  * Contact: 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/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/i2c.h>
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/types.h>
  23 #include <linux/slab.h>
  24 #include <media/v4l2-ctrls.h>
  25 #include <media/media-device.h>
  26
  27 #include "fimc-core.h"
  28 #include "fimc-mdevice.h"
  29 #include "mipi-csis.h"
  30
  31 static int __fimc_md_set_camclk(struct fimc_md *fmd,
  32                                 struct fimc_sensor_info *s_info,
  33                                 bool on);
  34 /**
  35  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  36  * @fimc: fimc device terminating the pipeline
  37  *
  38  * Caller holds the graph mutex.
  39  */
  40 void fimc_pipeline_prepare(struct fimc_dev *fimc, struct media_entity *me)
  41 {
  42         struct media_entity_graph graph;
  43         struct v4l2_subdev *sd;
  44
  45         media_entity_graph_walk_start(&graph, me);
  46
  47         while ((me = media_entity_graph_walk_next(&graph))) {
  48                 if (media_entity_type(me) != MEDIA_ENT_T_V4L2_SUBDEV)
  49                         continue;
  50                 sd = media_entity_to_v4l2_subdev(me);
  51
  52                 if (sd->grp_id == SENSOR_GROUP_ID)
  53                         fimc->pipeline.sensor = sd;
  54                 else if (sd->grp_id == CSIS_GROUP_ID)
  55                         fimc->pipeline.csis = sd;
  56         }
  57 }
  58
  59 /**
  60  * __subdev_set_power - change power state of a single subdev
  61  * @sd: subdevice to change power state for
  62  * @on: 1 to enable power or 0 to disable
  63  *
  64  * Return result of s_power subdev operation or -ENXIO if sd argument
  65  * is NULL. Return 0 if the subdevice does not implement s_power.
  66  */
  67 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
  68 {
  69         int *use_count;
  70         int ret;
  71
  72         if (sd == NULL)
  73                 return -ENXIO;
  74
  75         use_count = &sd->entity.use_count;
  76         if (on && (*use_count)++ > 0)
  77                 return 0;
  78         else if (!on && (*use_count == 0 || --(*use_count) > 0))
  79                 return 0;
  80         ret = v4l2_subdev_call(sd, core, s_power, on);
  81
  82         return ret != -ENOIOCTLCMD ? ret : 0;
  83 }
  84
  85 /**
  86  * fimc_pipeline_s_power - change power state of all pipeline subdevs
  87  * @fimc: fimc device terminating the pipeline
  88  * @state: 1 to enable power or 0 for power down
  89  *
  90  * Need to be called with the graph mutex held.
  91  */
  92 int fimc_pipeline_s_power(struct fimc_dev *fimc, int state)
  93 {
  94         int ret = 0;
  95
  96         if (fimc->pipeline.sensor == NULL)
  97                 return -ENXIO;
  98
  99         if (state) {
 100                 ret = __subdev_set_power(fimc->pipeline.csis, 1);
 101                 if (ret && ret != -ENXIO)
 102                         return ret;
 103                 return __subdev_set_power(fimc->pipeline.sensor, 1);
 104         }
 105
 106         ret = __subdev_set_power(fimc->pipeline.sensor, 0);
 107         if (ret)
 108                 return ret;
 109         ret = __subdev_set_power(fimc->pipeline.csis, 0);
 110
 111         return ret == -ENXIO ? 0 : ret;
 112 }
 113
 114 /**
 115  * __fimc_pipeline_initialize - update the pipeline information, enable power
 116  *                              of all pipeline subdevs and the sensor clock
 117  * @me: media entity to start graph walk with
 118  * @prep: true to acquire sensor (and csis) subdevs
 119  *
 120  * This function must be called with the graph mutex held.
 121  */
 122 static int __fimc_pipeline_initialize(struct fimc_dev *fimc,
 123                                       struct media_entity *me, bool prep)
 124 {
 125         int ret;
 126
 127         if (prep)
 128                 fimc_pipeline_prepare(fimc, me);
 129         if (fimc->pipeline.sensor == NULL)
 130                 return -EINVAL;
 131         ret = fimc_md_set_camclk(fimc->pipeline.sensor, true);
 132         if (ret)
 133                 return ret;
 134         return fimc_pipeline_s_power(fimc, 1);
 135 }
 136
 137 int fimc_pipeline_initialize(struct fimc_dev *fimc, struct media_entity *me,
 138                              bool prep)
 139 {
 140         int ret;
 141
 142         mutex_lock(&me->parent->graph_mutex);
 143         ret =  __fimc_pipeline_initialize(fimc, me, prep);
 144         mutex_unlock(&me->parent->graph_mutex);
 145
 146         return ret;
 147 }
 148
 149 /**
 150  * __fimc_pipeline_shutdown - disable the sensor clock and pipeline power
 151  * @fimc: fimc device terminating the pipeline
 152  *
 153  * Disable power of all subdevs in the pipeline and turn off the external
 154  * sensor clock.
 155  * Called with the graph mutex held.
 156  */
 157 int __fimc_pipeline_shutdown(struct fimc_dev *fimc)
 158 {
 159         int ret = 0;
 160
 161         if (fimc->pipeline.sensor) {
 162                 ret = fimc_pipeline_s_power(fimc, 0);
 163                 fimc_md_set_camclk(fimc->pipeline.sensor, false);
 164         }
 165         return ret == -ENXIO ? 0 : ret;
 166 }
 167
 168 int fimc_pipeline_shutdown(struct fimc_dev *fimc)
 169 {
 170         struct media_entity *me = &fimc->vid_cap.vfd->entity;
 171         int ret;
 172
 173         mutex_lock(&me->parent->graph_mutex);
 174         ret = __fimc_pipeline_shutdown(fimc);
 175         mutex_unlock(&me->parent->graph_mutex);
 176
 177         return ret;
 178 }
 179
 180 /**
 181  * fimc_pipeline_s_stream - invoke s_stream on pipeline subdevs
 182  * @fimc: fimc device terminating the pipeline
 183  * @on: passed as the s_stream call argument
 184  */
 185 int fimc_pipeline_s_stream(struct fimc_dev *fimc, int on)
 186 {
 187         struct fimc_pipeline *p = &fimc->pipeline;
 188         int ret = 0;
 189
 190         if (p->sensor == NULL)
 191                 return -ENODEV;
 192
 193         if ((on && p->csis) || !on)
 194                 ret = v4l2_subdev_call(on ? p->csis : p->sensor,
 195                                        video, s_stream, on);
 196         if (ret < 0 && ret != -ENOIOCTLCMD)
 197                 return ret;
 198         if ((!on && p->csis) || on)
 199                 ret = v4l2_subdev_call(on ? p->sensor : p->csis,
 200                                        video, s_stream, on);
 201         return ret == -ENOIOCTLCMD ? 0 : ret;
 202 }
 203
 204 /*
 205  * Sensor subdevice helper functions
 206  */
 207 static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
 208                                    struct fimc_sensor_info *s_info)
 209 {
 210         struct i2c_adapter *adapter;
 211         struct v4l2_subdev *sd = NULL;
 212
 213         if (!s_info || !fmd)
 214                 return NULL;
 215
 216         adapter = i2c_get_adapter(s_info->pdata->i2c_bus_num);
 217         if (!adapter)
 218                 return NULL;
 219         sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,
 220                                        s_info->pdata->board_info, NULL);
 221         if (IS_ERR_OR_NULL(sd)) {
 222                 i2c_put_adapter(adapter);
 223                 v4l2_err(&fmd->v4l2_dev, "Failed to acquire subdev\n");
 224                 return NULL;
 225         }
 226         v4l2_set_subdev_hostdata(sd, s_info);
 227         sd->grp_id = SENSOR_GROUP_ID;
 228
 229         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
 230                   s_info->pdata->board_info->type);
 231         return sd;
 232 }
 233
 234 static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
 235 {
 236         struct i2c_client *client = v4l2_get_subdevdata(sd);
 237         struct i2c_adapter *adapter;
 238
 239         if (!client)
 240                 return;
 241         v4l2_device_unregister_subdev(sd);
 242         adapter = client->adapter;
 243         i2c_unregister_device(client);
 244         if (adapter)
 245                 i2c_put_adapter(adapter);
 246 }
 247
 248 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 249 {
 250         struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
 251         struct fimc_dev *fd = NULL;
 252         int num_clients, ret, i;
 253
 254         /*
 255          * Runtime resume one of the FIMC entities to make sure
 256          * the sclk_cam clocks are not globally disabled.
 257          */
 258         for (i = 0; !fd && i < ARRAY_SIZE(fmd->fimc); i++)
 259                 if (fmd->fimc[i])
 260                         fd = fmd->fimc[i];
 261         if (!fd)
 262                 return -ENXIO;
 263         ret = pm_runtime_get_sync(&fd->pdev->dev);
 264         if (ret < 0)
 265                 return ret;
 266
 267         WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
 268         num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));
 269
 270         fmd->num_sensors = num_clients;
 271         for (i = 0; i < num_clients; i++) {
 272                 fmd->sensor[i].pdata = &pdata->isp_info[i];
 273                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
 274                 if (ret)
 275                         break;
 276                 fmd->sensor[i].subdev =
 277                         fimc_md_register_sensor(fmd, &fmd->sensor[i]);
 278                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
 279                 if (ret)
 280                         break;
 281         }
 282         pm_runtime_put(&fd->pdev->dev);
 283         return ret;
 284 }
 285
 286 /*
 287  * MIPI CSIS and FIMC platform devices registration.
 288  */
 289 static int fimc_register_callback(struct device *dev, void *p)
 290 {
 291         struct fimc_dev *fimc = dev_get_drvdata(dev);
 292         struct fimc_md *fmd = p;
 293         int ret;
 294
 295         if (!fimc || !fimc->pdev)
 296                 return 0;
 297         if (fimc->pdev->id < 0 || fimc->pdev->id >= FIMC_MAX_DEVS)
 298                 return 0;
 299
 300         fmd->fimc[fimc->pdev->id] = fimc;
 301         ret = fimc_register_m2m_device(fimc, &fmd->v4l2_dev);
 302         if (ret)
 303                 return ret;
 304         ret = fimc_register_capture_device(fimc, &fmd->v4l2_dev);
 305         if (!ret)
 306                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 307         return ret;
 308 }
 309
 310 static int csis_register_callback(struct device *dev, void *p)
 311 {
 312         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 313         struct platform_device *pdev;
 314         struct fimc_md *fmd = p;
 315         int id, ret;
 316
 317         if (!sd)
 318                 return 0;
 319         pdev = v4l2_get_subdevdata(sd);
 320         if (!pdev || pdev->id < 0 || pdev->id >= CSIS_MAX_ENTITIES)
 321                 return 0;
 322         v4l2_info(sd, "csis%d sd: %s\n", pdev->id, sd->name);
 323
 324         id = pdev->id < 0 ? 0 : pdev->id;
 325         fmd->csis[id].sd = sd;
 326         sd->grp_id = CSIS_GROUP_ID;
 327         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 328         if (ret)
 329                 v4l2_err(&fmd->v4l2_dev,
 330                          "Failed to register CSIS subdevice: %d\n", ret);
 331         return ret;
 332 }
 333
 334 /**
 335  * fimc_md_register_platform_entities - register FIMC and CSIS media entities
 336  */
 337 static int fimc_md_register_platform_entities(struct fimc_md *fmd)
 338 {
 339         struct device_driver *driver;
 340         int ret;
 341
 342         driver = driver_find(FIMC_MODULE_NAME, &platform_bus_type);
 343         if (!driver)
 344                 return -ENODEV;
 345         ret = driver_for_each_device(driver, NULL, fmd,
 346                                      fimc_register_callback);
 347         if (ret)
 348                 return ret;
 349
 350         driver = driver_find(CSIS_DRIVER_NAME, &platform_bus_type);
 351         if (driver)
 352                 ret = driver_for_each_device(driver, NULL, fmd,
 353                                              csis_register_callback);
 354         return ret;
 355 }
 356
 357 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 358 {
 359         int i;
 360
 361         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 362                 if (fmd->fimc[i] == NULL)
 363                         continue;
 364                 fimc_unregister_m2m_device(fmd->fimc[i]);
 365                 fimc_unregister_capture_device(fmd->fimc[i]);
 366                 fmd->fimc[i] = NULL;
 367         }
 368         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 369                 if (fmd->csis[i].sd == NULL)
 370                         continue;
 371                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 372                 fmd->csis[i].sd = NULL;
 373         }
 374         for (i = 0; i < fmd->num_sensors; i++) {
 375                 if (fmd->sensor[i].subdev == NULL)
 376                         continue;
 377                 fimc_md_unregister_sensor(fmd->sensor[i].subdev);
 378                 fmd->sensor[i].subdev = NULL;
 379         }
 380 }
 381
 382 static int fimc_md_register_video_nodes(struct fimc_md *fmd)
 383 {
 384         struct video_device *vdev;
 385         int i, ret = 0;
 386
 387         for (i = 0; i < FIMC_MAX_DEVS && !ret; i++) {
 388                 if (!fmd->fimc[i])
 389                         continue;
 390
 391                 vdev = fmd->fimc[i]->m2m.vfd;
 392                 if (vdev) {
 393                         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
 394                         if (ret)
 395                                 break;
 396                         v4l2_info(&fmd->v4l2_dev, "Registered %s as /dev/%s\n",
 397                                   vdev->name, video_device_node_name(vdev));
 398                 }
 399
 400                 vdev = fmd->fimc[i]->vid_cap.vfd;
 401                 if (vdev == NULL)
 402                         continue;
 403                 ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
 404                 v4l2_info(&fmd->v4l2_dev, "Registered %s as /dev/%s\n",
 405                           vdev->name, video_device_node_name(vdev));
 406         }
 407
 408         return ret;
 409 }
 410
 411 /**
 412  * __fimc_md_create_fimc_links - create links to all FIMC entities
 413  * @fmd: fimc media device
 414  * @source: the source entity to create links to all fimc entities from
 415  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 416  * @pad: the source entity pad index
 417  * @fimc_id: index of the fimc device for which link should be enabled
 418  */
 419 static int __fimc_md_create_fimc_links(struct fimc_md *fmd,
 420                                        struct media_entity *source,
 421                                        struct v4l2_subdev *sensor,
 422                                        int pad, int fimc_id)
 423 {
 424         struct fimc_sensor_info *s_info;
 425         struct media_entity *sink;
 426         unsigned int flags;
 427         int ret, i;
 428
 429         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 430                 if (!fmd->fimc[i])
 431                         break;
 432                 /*
 433                  * Some FIMC variants are not fitted with camera capture
 434                  * interface. Skip creating a link from sensor for those.
 435                  */
 436                 if (sensor->grp_id == SENSOR_GROUP_ID &&
 437                     !fmd->fimc[i]->variant->has_cam_if)
 438                         continue;
 439
 440                 flags = (i == fimc_id) ? MEDIA_LNK_FL_ENABLED : 0;
 441                 sink = &fmd->fimc[i]->vid_cap.subdev->entity;
 442                 ret = media_entity_create_link(source, pad, sink,
 443                                               FIMC_SD_PAD_SINK, flags);
 444                 if (ret)
 445                         return ret;
 446
 447                 /* Notify FIMC capture subdev entity */
 448                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 449                                         &source->pads[pad], flags);
 450                 if (ret)
 451                         break;
 452
 453                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]",
 454                           source->name, flags ? '=' : '-', sink->name);
 455
 456                 if (flags == 0)
 457                         continue;
 458                 s_info = v4l2_get_subdev_hostdata(sensor);
 459                 if (!WARN_ON(s_info == NULL)) {
 460                         unsigned long irq_flags;
 461                         spin_lock_irqsave(&fmd->slock, irq_flags);
 462                         s_info->host = fmd->fimc[i];
 463                         spin_unlock_irqrestore(&fmd->slock, irq_flags);
 464                 }
 465         }
 466         return 0;
 467 }
 468
 469 /**
 470  * fimc_md_create_links - create default links between registered entities
 471  *
 472  * Parallel interface sensor entities are connected directly to FIMC capture
 473  * entities. The sensors using MIPI CSIS bus are connected through immutable
 474  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 475  * entity has a link to each registered FIMC capture entity. Enabled links
 476  * are created by default between each subsequent registered sensor and
 477  * subsequent FIMC capture entity. The number of default active links is
 478  * determined by the number of available sensors or FIMC entities,
 479  * whichever is less.
 480  */
 481 static int fimc_md_create_links(struct fimc_md *fmd)
 482 {
 483         struct v4l2_subdev *sensor, *csis;
 484         struct s5p_fimc_isp_info *pdata;
 485         struct fimc_sensor_info *s_info;
 486         struct media_entity *source, *sink;
 487         int i, pad, fimc_id = 0;
 488         int ret = 0;
 489         u32 flags;
 490
 491         for (i = 0; i < fmd->num_sensors; i++) {
 492                 if (fmd->sensor[i].subdev == NULL)
 493                         continue;
 494
 495                 sensor = fmd->sensor[i].subdev;
 496                 s_info = v4l2_get_subdev_hostdata(sensor);
 497                 if (!s_info || !s_info->pdata)
 498                         continue;
 499
 500                 source = NULL;
 501                 pdata = s_info->pdata;
 502
 503                 switch (pdata->bus_type) {
 504                 case FIMC_MIPI_CSI2:
 505                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 506                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 507                                 return -EINVAL;
 508
 509                         csis = fmd->csis[pdata->mux_id].sd;
 510                         if (WARN(csis == NULL,
 511                                  "MIPI-CSI interface specified "
 512                                  "but s5p-csis module is not loaded!\n"))
 513                                 return -EINVAL;
 514
 515                         ret = media_entity_create_link(&sensor->entity, 0,
 516                                               &csis->entity, CSIS_PAD_SINK,
 517                                               MEDIA_LNK_FL_IMMUTABLE |
 518                                               MEDIA_LNK_FL_ENABLED);
 519                         if (ret)
 520                                 return ret;
 521
 522                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]",
 523                                   sensor->entity.name, csis->entity.name);
 524
 525                         source = &csis->entity;
 526                         pad = CSIS_PAD_SOURCE;
 527                         break;
 528
 529                 case FIMC_ITU_601...FIMC_ITU_656:
 530                         source = &sensor->entity;
 531                         pad = 0;
 532                         break;
 533
 534                 default:
 535                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 536                                  pdata->bus_type);
 537                         return -EINVAL;
 538                 }
 539                 if (source == NULL)
 540                         continue;
 541
 542                 ret = __fimc_md_create_fimc_links(fmd, source, sensor, pad,
 543                                                   fimc_id++);
 544         }
 545         /* Create immutable links between each FIMC's subdev and video node */
 546         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 547         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 548                 if (!fmd->fimc[i])
 549                         continue;
 550                 source = &fmd->fimc[i]->vid_cap.subdev->entity;
 551                 sink = &fmd->fimc[i]->vid_cap.vfd->entity;
 552                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
 553                                               sink, 0, flags);
 554                 if (ret)
 555                         break;
 556         }
 557
 558         return ret;
 559 }
 560
 561 /*
 562  * The peripheral sensor clock management.
 563  */
 564 static int fimc_md_get_clocks(struct fimc_md *fmd)
 565 {
 566         char clk_name[32];
 567         struct clk *clock;
 568         int i;
 569
 570         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
 571                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
 572                 clock = clk_get(NULL, clk_name);
 573                 if (IS_ERR_OR_NULL(clock)) {
 574                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s",
 575                                   clk_name);
 576                         return -ENXIO;
 577                 }
 578                 fmd->camclk[i].clock = clock;
 579         }
 580         return 0;
 581 }
 582
 583 static void fimc_md_put_clocks(struct fimc_md *fmd)
 584 {
 585         int i = FIMC_MAX_CAMCLKS;
 586
 587         while (--i >= 0) {
 588                 if (IS_ERR_OR_NULL(fmd->camclk[i].clock))
 589                         continue;
 590                 clk_put(fmd->camclk[i].clock);
 591                 fmd->camclk[i].clock = NULL;
 592         }
 593 }
 594
 595 static int __fimc_md_set_camclk(struct fimc_md *fmd,
 596                                          struct fimc_sensor_info *s_info,
 597                                          bool on)
 598 {
 599         struct s5p_fimc_isp_info *pdata = s_info->pdata;
 600         struct fimc_camclk_info *camclk;
 601         int ret = 0;
 602
 603         if (WARN_ON(pdata->clk_id >= FIMC_MAX_CAMCLKS) || fmd == NULL)
 604                 return -EINVAL;
 605
 606         if (s_info->clk_on == on)
 607                 return 0;
 608         camclk = &fmd->camclk[pdata->clk_id];
 609
 610         dbg("camclk %d, f: %lu, clk: %p, on: %d",
 611             pdata->clk_id, pdata->clk_frequency, camclk, on);
 612
 613         if (on) {
 614                 if (camclk->use_count > 0 &&
 615                     camclk->frequency != pdata->clk_frequency)
 616                         return -EINVAL;
 617
 618                 if (camclk->use_count++ == 0) {
 619                         clk_set_rate(camclk->clock, pdata->clk_frequency);
 620                         camclk->frequency = pdata->clk_frequency;
 621                         ret = clk_enable(camclk->clock);
 622                 }
 623                 s_info->clk_on = 1;
 624                 dbg("Enabled camclk %d: f: %lu", pdata->clk_id,
 625                     clk_get_rate(camclk->clock));
 626
 627                 return ret;
 628         }
 629
 630         if (WARN_ON(camclk->use_count == 0))
 631                 return 0;
 632
 633         if (--camclk->use_count == 0) {
 634                 clk_disable(camclk->clock);
 635                 s_info->clk_on = 0;
 636                 dbg("Disabled camclk %d", pdata->clk_id);
 637         }
 638         return ret;
 639 }
 640
 641 /**
 642  * fimc_md_set_camclk - peripheral sensor clock setup
 643  * @sd: sensor subdev to configure sclk_cam clock for
 644  * @on: 1 to enable or 0 to disable the clock
 645  *
 646  * There are 2 separate clock outputs available in the SoC for external
 647  * image processors. These clocks are shared between all registered FIMC
 648  * devices to which sensors can be attached, either directly or through
 649  * the MIPI CSI receiver. The clock is allowed here to be used by
 650  * multiple sensors concurrently if they use same frequency.
 651  * The per sensor subdev clk_on attribute helps to synchronize accesses
 652  * to the sclk_cam clocks from the video and media device nodes.
 653  * This function should only be called when the graph mutex is held.
 654  */
 655 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
 656 {
 657         struct fimc_sensor_info *s_info = v4l2_get_subdev_hostdata(sd);
 658         struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
 659
 660         return __fimc_md_set_camclk(fmd, s_info, on);
 661 }
 662
 663 static int fimc_md_link_notify(struct media_pad *source,
 664                                struct media_pad *sink, u32 flags)
 665 {
 666         struct v4l2_subdev *sd;
 667         struct fimc_dev *fimc;
 668         int ret = 0;
 669
 670         if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 671                 return 0;
 672
 673         sd = media_entity_to_v4l2_subdev(sink->entity);
 674         fimc = v4l2_get_subdevdata(sd);
 675
 676         if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 677                 ret = __fimc_pipeline_shutdown(fimc);
 678                 fimc->pipeline.sensor = NULL;
 679                 fimc->pipeline.csis = NULL;
 680
 681                 mutex_lock(&fimc->lock);
 682                 fimc_ctrls_delete(fimc->vid_cap.ctx);
 683                 mutex_unlock(&fimc->lock);
 684                 return ret;
 685         }
 686         /*
 687          * Link activation. Enable power of pipeline elements only if the
 688          * pipeline is already in use, i.e. its video node is opened.
 689          * Recreate the controls destroyed during the link deactivation.
 690          */
 691         mutex_lock(&fimc->lock);
 692         if (fimc->vid_cap.refcnt > 0) {
 693                 ret = __fimc_pipeline_initialize(fimc, source->entity, true);
 694                 if (!ret)
 695                         ret = fimc_capture_ctrls_create(fimc);
 696         }
 697         mutex_unlock(&fimc->lock);
 698
 699         return ret ? -EPIPE : ret;
 700 }
 701
 702 static ssize_t fimc_md_sysfs_show(struct device *dev,
 703                                   struct device_attribute *attr, char *buf)
 704 {
 705         struct platform_device *pdev = to_platform_device(dev);
 706         struct fimc_md *fmd = platform_get_drvdata(pdev);
 707
 708         if (fmd->user_subdev_api)
 709                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
 710
 711         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
 712 }
 713
 714 static ssize_t fimc_md_sysfs_store(struct device *dev,
 715                                    struct device_attribute *attr,
 716                                    const char *buf, size_t count)
 717 {
 718         struct platform_device *pdev = to_platform_device(dev);
 719         struct fimc_md *fmd = platform_get_drvdata(pdev);
 720         bool subdev_api;
 721         int i;
 722
 723         if (!strcmp(buf, "vid-dev\n"))
 724                 subdev_api = false;
 725         else if (!strcmp(buf, "sub-dev\n"))
 726                 subdev_api = true;
 727         else
 728                 return count;
 729
 730         fmd->user_subdev_api = subdev_api;
 731         for (i = 0; i < FIMC_MAX_DEVS; i++)
 732                 if (fmd->fimc[i])
 733                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
 734         return count;
 735 }
 736 /*
 737  * This device attribute is to select video pipeline configuration method.
 738  * There are following valid values:
 739  *  vid-dev - for V4L2 video node API only, subdevice will be configured
 740  *  by the host driver.
 741  *  sub-dev - for media controller API, subdevs must be configured in user
 742  *  space before starting streaming.
 743  */
 744 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
 745                    fimc_md_sysfs_show, fimc_md_sysfs_store);
 746
 747 static int __devinit fimc_md_probe(struct platform_device *pdev)
 748 {
 749         struct v4l2_device *v4l2_dev;
 750         struct fimc_md *fmd;
 751         int ret;
 752
 753         fmd = devm_kzalloc(&pdev->dev, sizeof(*fmd), GFP_KERNEL);
 754         if (!fmd)
 755                 return -ENOMEM;
 756
 757         spin_lock_init(&fmd->slock);
 758         fmd->pdev = pdev;
 759
 760         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
 761                 sizeof(fmd->media_dev.model));
 762         fmd->media_dev.link_notify = fimc_md_link_notify;
 763         fmd->media_dev.dev = &pdev->dev;
 764
 765         v4l2_dev = &fmd->v4l2_dev;
 766         v4l2_dev->mdev = &fmd->media_dev;
 767         v4l2_dev->notify = fimc_sensor_notify;
 768         snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s",
 769                  dev_name(&pdev->dev));
 770
 771         ret = v4l2_device_register(&pdev->dev, &fmd->v4l2_dev);
 772         if (ret < 0) {
 773                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
 774                 return ret;
 775         }
 776         ret = media_device_register(&fmd->media_dev);
 777         if (ret < 0) {
 778                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
 779                 goto err2;
 780         }
 781         ret = fimc_md_get_clocks(fmd);
 782         if (ret)
 783                 goto err3;
 784
 785         fmd->user_subdev_api = false;
 786         ret = fimc_md_register_platform_entities(fmd);
 787         if (ret)
 788                 goto err3;
 789
 790         if (pdev->dev.platform_data) {
 791                 ret = fimc_md_register_sensor_entities(fmd);
 792                 if (ret)
 793                         goto err3;
 794         }
 795         ret = fimc_md_create_links(fmd);
 796         if (ret)
 797                 goto err3;
 798         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
 799         if (ret)
 800                 goto err3;
 801         ret = fimc_md_register_video_nodes(fmd);
 802         if (ret)
 803                 goto err3;
 804
 805         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
 806         if (!ret) {
 807                 platform_set_drvdata(pdev, fmd);
 808                 return 0;
 809         }
 810 err3:
 811         media_device_unregister(&fmd->media_dev);
 812         fimc_md_put_clocks(fmd);
 813         fimc_md_unregister_entities(fmd);
 814 err2:
 815         v4l2_device_unregister(&fmd->v4l2_dev);
 816         return ret;
 817 }
 818
 819 static int __devexit fimc_md_remove(struct platform_device *pdev)
 820 {
 821         struct fimc_md *fmd = platform_get_drvdata(pdev);
 822
 823         if (!fmd)
 824                 return 0;
 825         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
 826         fimc_md_unregister_entities(fmd);
 827         media_device_unregister(&fmd->media_dev);
 828         fimc_md_put_clocks(fmd);
 829         return 0;
 830 }
 831
 832 static struct platform_driver fimc_md_driver = {
 833         .probe          = fimc_md_probe,
 834         .remove         = __devexit_p(fimc_md_remove),
 835         .driver = {
 836                 .name   = "s5p-fimc-md",
 837                 .owner  = THIS_MODULE,
 838         }
 839 };
 840
 841 int __init fimc_md_init(void)
 842 {
 843         int ret;
 844         request_module("s5p-csis");
 845         ret = fimc_register_driver();
 846         if (ret)
 847                 return ret;
 848         return platform_driver_register(&fimc_md_driver);
 849 }
 850 void __exit fimc_md_exit(void)
 851 {
 852         platform_driver_unregister(&fimc_md_driver);
 853         fimc_unregister_driver();
 854 }
 855
 856 module_init(fimc_md_init);
 857 module_exit(fimc_md_exit);
 858
 859 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 860 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
 861 MODULE_LICENSE("GPL");
 862 MODULE_VERSION("2.0.1");