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 <linux/version.h>
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/media-device.h>
  27
  28 #include "fimc-core.h"
  29 #include "fimc-mdevice.h"
  30 #include "mipi-csis.h"
  31
  32 static int __fimc_md_set_camclk(struct fimc_md *fmd,
  33                                 struct fimc_sensor_info *s_info,
  34                                 bool on);
  35 /**
  36  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  37  * @fimc: fimc device terminating the pipeline
  38  *
  39  * Caller holds the graph mutex.
  40  */
  41 void fimc_pipeline_prepare(struct fimc_dev *fimc, struct media_entity *me)
  42 {
  43         struct media_entity_graph graph;
  44         struct v4l2_subdev *sd;
  45
  46         media_entity_graph_walk_start(&graph, me);
  47
  48         while ((me = media_entity_graph_walk_next(&graph))) {
  49                 if (media_entity_type(me) != MEDIA_ENT_T_V4L2_SUBDEV)
  50                         continue;
  51                 sd = media_entity_to_v4l2_subdev(me);
  52
  53                 if (sd->grp_id == SENSOR_GROUP_ID)
  54                         fimc->pipeline.sensor = sd;
  55                 else if (sd->grp_id == CSIS_GROUP_ID)
  56                         fimc->pipeline.csis = sd;
  57         }
  58 }
  59
  60 /**
  61  * __subdev_set_power - change power state of a single subdev
  62  * @sd: subdevice to change power state for
  63  * @on: 1 to enable power or 0 to disable
  64  *
  65  * Return result of s_power subdev operation or -ENXIO if sd argument
  66  * is NULL. Return 0 if the subdevice does not implement s_power.
  67  */
  68 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
  69 {
  70         int *use_count;
  71         int ret;
  72
  73         if (sd == NULL)
  74                 return -ENXIO;
  75
  76         use_count = &sd->entity.use_count;
  77         if (on && (*use_count)++ > 0)
  78                 return 0;
  79         else if (!on && (*use_count == 0 || --(*use_count) > 0))
  80                 return 0;
  81         ret = v4l2_subdev_call(sd, core, s_power, on);
  82
  83         return ret != -ENOIOCTLCMD ? ret : 0;
  84 }
  85
  86 /**
  87  * fimc_pipeline_s_power - change power state of all pipeline subdevs
  88  * @fimc: fimc device terminating the pipeline
  89  * @state: 1 to enable power or 0 for power down
  90  *
  91  * Need to be called with the graph mutex held.
  92  */
  93 int fimc_pipeline_s_power(struct fimc_dev *fimc, int state)
  94 {
  95         int ret = 0;
  96
  97         if (fimc->pipeline.sensor == NULL)
  98                 return -ENXIO;
  99
 100         if (state) {
 101                 ret = __subdev_set_power(fimc->pipeline.csis, 1);
 102                 if (ret && ret != -ENXIO)
 103                         return ret;
 104                 return __subdev_set_power(fimc->pipeline.sensor, 1);
 105         }
 106
 107         ret = __subdev_set_power(fimc->pipeline.sensor, 0);
 108         if (ret)
 109                 return ret;
 110         ret = __subdev_set_power(fimc->pipeline.csis, 0);
 111
 112         return ret == -ENXIO ? 0 : ret;
 113 }
 114
 115 /**
 116  * __fimc_pipeline_initialize - update the pipeline information, enable power
 117  *                              of all pipeline subdevs and the sensor clock
 118  * @me: media entity to start graph walk with
 119  * @prep: true to acquire sensor (and csis) subdevs
 120  *
 121  * This function must be called with the graph mutex held.
 122  */
 123 static int __fimc_pipeline_initialize(struct fimc_dev *fimc,
 124                                       struct media_entity *me, bool prep)
 125 {
 126         int ret;
 127
 128         if (prep)
 129                 fimc_pipeline_prepare(fimc, me);
 130         if (fimc->pipeline.sensor == NULL)
 131                 return -EINVAL;
 132         ret = fimc_md_set_camclk(fimc->pipeline.sensor, true);
 133         if (ret)
 134                 return ret;
 135         return fimc_pipeline_s_power(fimc, 1);
 136 }
 137
 138 int fimc_pipeline_initialize(struct fimc_dev *fimc, struct media_entity *me,
 139                              bool prep)
 140 {
 141         int ret;
 142
 143         mutex_lock(&me->parent->graph_mutex);
 144         ret =  __fimc_pipeline_initialize(fimc, me, prep);
 145         mutex_unlock(&me->parent->graph_mutex);
 146
 147         return ret;
 148 }
 149
 150 /**
 151  * __fimc_pipeline_shutdown - disable the sensor clock and pipeline power
 152  * @fimc: fimc device terminating the pipeline
 153  *
 154  * Disable power of all subdevs in the pipeline and turn off the external
 155  * sensor clock.
 156  * Called with the graph mutex held.
 157  */
 158 int __fimc_pipeline_shutdown(struct fimc_dev *fimc)
 159 {
 160         int ret = 0;
 161
 162         if (fimc->pipeline.sensor) {
 163                 ret = fimc_pipeline_s_power(fimc, 0);
 164                 fimc_md_set_camclk(fimc->pipeline.sensor, false);
 165         }
 166         return ret == -ENXIO ? 0 : ret;
 167 }
 168
 169 int fimc_pipeline_shutdown(struct fimc_dev *fimc)
 170 {
 171         struct media_entity *me = &fimc->vid_cap.vfd->entity;
 172         int ret;
 173
 174         mutex_lock(&me->parent->graph_mutex);
 175         ret = __fimc_pipeline_shutdown(fimc);
 176         mutex_unlock(&me->parent->graph_mutex);
 177
 178         return ret;
 179 }
 180
 181 /**
 182  * fimc_pipeline_s_stream - invoke s_stream on pipeline subdevs
 183  * @fimc: fimc device terminating the pipeline
 184  * @on: passed as the s_stream call argument
 185  */
 186 int fimc_pipeline_s_stream(struct fimc_dev *fimc, int on)
 187 {
 188         struct fimc_pipeline *p = &fimc->pipeline;
 189         int ret = 0;
 190
 191         if (p->sensor == NULL)
 192                 return -ENODEV;
 193
 194         if ((on && p->csis) || !on)
 195                 ret = v4l2_subdev_call(on ? p->csis : p->sensor,
 196                                        video, s_stream, on);
 197         if (ret < 0 && ret != -ENOIOCTLCMD)
 198                 return ret;
 199         if ((!on && p->csis) || on)
 200                 ret = v4l2_subdev_call(on ? p->sensor : p->csis,
 201                                        video, s_stream, on);
 202         return ret == -ENOIOCTLCMD ? 0 : ret;
 203 }
 204
 205 /*
 206  * Sensor subdevice helper functions
 207  */
 208 static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
 209                                    struct fimc_sensor_info *s_info)
 210 {
 211         struct i2c_adapter *adapter;
 212         struct v4l2_subdev *sd = NULL;
 213
 214         if (!s_info || !fmd)
 215                 return NULL;
 216
 217         adapter = i2c_get_adapter(s_info->pdata->i2c_bus_num);
 218         if (!adapter)
 219                 return NULL;
 220         sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,
 221                                        s_info->pdata->board_info, NULL);
 222         if (IS_ERR_OR_NULL(sd)) {
 223                 i2c_put_adapter(adapter);
 224                 v4l2_err(&fmd->v4l2_dev, "Failed to acquire subdev\n");
 225                 return NULL;
 226         }
 227         v4l2_set_subdev_hostdata(sd, s_info);
 228         sd->grp_id = SENSOR_GROUP_ID;
 229
 230         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
 231                   s_info->pdata->board_info->type);
 232         return sd;
 233 }
 234
 235 static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
 236 {
 237         struct i2c_client *client = v4l2_get_subdevdata(sd);
 238         struct i2c_adapter *adapter;
 239
 240         if (!client)
 241                 return;
 242         v4l2_device_unregister_subdev(sd);
 243         adapter = client->adapter;
 244         i2c_unregister_device(client);
 245         if (adapter)
 246                 i2c_put_adapter(adapter);
 247 }
 248
 249 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 250 {
 251         struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
 252         struct fimc_dev *fd = NULL;
 253         int num_clients, ret, i;
 254
 255         /*
 256          * Runtime resume one of the FIMC entities to make sure
 257          * the sclk_cam clocks are not globally disabled.
 258          */
 259         for (i = 0; !fd && i < ARRAY_SIZE(fmd->fimc); i++)
 260                 if (fmd->fimc[i])
 261                         fd = fmd->fimc[i];
 262         if (!fd)
 263                 return -ENXIO;
 264         ret = pm_runtime_get_sync(&fd->pdev->dev);
 265         if (ret < 0)
 266                 return ret;
 267
 268         WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
 269         num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));
 270
 271         fmd->num_sensors = num_clients;
 272         for (i = 0; i < num_clients; i++) {
 273                 fmd->sensor[i].pdata = &pdata->isp_info[i];
 274                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
 275                 if (ret)
 276                         break;
 277                 fmd->sensor[i].subdev =
 278                         fimc_md_register_sensor(fmd, &fmd->sensor[i]);
 279                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
 280                 if (ret)
 281                         break;
 282         }
 283         pm_runtime_put(&fd->pdev->dev);
 284         return ret;
 285 }
 286
 287 /*
 288  * MIPI CSIS and FIMC platform devices registration.
 289  */
 290 static int fimc_register_callback(struct device *dev, void *p)
 291 {
 292         struct fimc_dev *fimc = dev_get_drvdata(dev);
 293         struct fimc_md *fmd = p;
 294         int ret;
 295
 296         if (!fimc || !fimc->pdev)
 297                 return 0;
 298         if (fimc->pdev->id < 0 || fimc->pdev->id >= FIMC_MAX_DEVS)
 299                 return 0;
 300
 301         fmd->fimc[fimc->pdev->id] = fimc;
 302         ret = fimc_register_m2m_device(fimc, &fmd->v4l2_dev);
 303         if (ret)
 304                 return ret;
 305         ret = fimc_register_capture_device(fimc, &fmd->v4l2_dev);
 306         if (!ret)
 307                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 308         return ret;
 309 }
 310
 311 static int csis_register_callback(struct device *dev, void *p)
 312 {
 313         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 314         struct platform_device *pdev;
 315         struct fimc_md *fmd = p;
 316         int id, ret;
 317
 318         if (!sd)
 319                 return 0;
 320         pdev = v4l2_get_subdevdata(sd);
 321         if (!pdev || pdev->id < 0 || pdev->id >= CSIS_MAX_ENTITIES)
 322                 return 0;
 323         v4l2_info(sd, "csis%d sd: %s\n", pdev->id, sd->name);
 324
 325         id = pdev->id < 0 ? 0 : pdev->id;
 326         fmd->csis[id].sd = sd;
 327         sd->grp_id = CSIS_GROUP_ID;
 328         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 329         if (ret)
 330                 v4l2_err(&fmd->v4l2_dev,
 331                          "Failed to register CSIS subdevice: %d\n", ret);
 332         return ret;
 333 }
 334
 335 /**
 336  * fimc_md_register_platform_entities - register FIMC and CSIS media entities
 337  */
 338 static int fimc_md_register_platform_entities(struct fimc_md *fmd)
 339 {
 340         struct device_driver *driver;
 341         int ret;
 342
 343         driver = driver_find(FIMC_MODULE_NAME, &platform_bus_type);
 344         if (!driver)
 345                 return -ENODEV;
 346         ret = driver_for_each_device(driver, NULL, fmd,
 347                                      fimc_register_callback);
 348         put_driver(driver);
 349         if (ret)
 350                 return ret;
 351
 352         driver = driver_find(CSIS_DRIVER_NAME, &platform_bus_type);
 353         if (driver) {
 354                 ret = driver_for_each_device(driver, NULL, fmd,
 355                                              csis_register_callback);
 356                 put_driver(driver);
 357         }
 358         return ret;
 359 }
 360
 361 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 362 {
 363         int i;
 364
 365         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 366                 if (fmd->fimc[i] == NULL)
 367                         continue;
 368                 fimc_unregister_m2m_device(fmd->fimc[i]);
 369                 fimc_unregister_capture_device(fmd->fimc[i]);
 370                 fmd->fimc[i] = NULL;
 371         }
 372         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 373                 if (fmd->csis[i].sd == NULL)
 374                         continue;
 375                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 376                 fmd->csis[i].sd = NULL;
 377         }
 378         for (i = 0; i < fmd->num_sensors; i++) {
 379                 if (fmd->sensor[i].subdev == NULL)
 380                         continue;
 381                 fimc_md_unregister_sensor(fmd->sensor[i].subdev);
 382                 fmd->sensor[i].subdev = NULL;
 383         }
 384 }
 385
 386 static int fimc_md_register_video_nodes(struct fimc_md *fmd)
 387 {
 388         struct video_device *vdev;
 389         int i, ret = 0;
 390
 391         for (i = 0; i < FIMC_MAX_DEVS && !ret; i++) {
 392                 if (!fmd->fimc[i])
 393                         continue;
 394
 395                 vdev = fmd->fimc[i]->m2m.vfd;
 396                 if (vdev) {
 397                         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
 398                         if (ret)
 399                                 break;
 400                         v4l2_info(&fmd->v4l2_dev, "Registered %s as /dev/%s\n",
 401                                   vdev->name, video_device_node_name(vdev));
 402                 }
 403
 404                 vdev = fmd->fimc[i]->vid_cap.vfd;
 405                 if (vdev == NULL)
 406                         continue;
 407                 ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
 408                 v4l2_info(&fmd->v4l2_dev, "Registered %s as /dev/%s\n",
 409                           vdev->name, video_device_node_name(vdev));
 410         }
 411
 412         return ret;
 413 }
 414
 415 /**
 416  * __fimc_md_create_fimc_links - create links to all FIMC entities
 417  * @fmd: fimc media device
 418  * @source: the source entity to create links to all fimc entities from
 419  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 420  * @pad: the source entity pad index
 421  * @fimc_id: index of the fimc device for which link should be enabled
 422  */
 423 static int __fimc_md_create_fimc_links(struct fimc_md *fmd,
 424                                        struct media_entity *source,
 425                                        struct v4l2_subdev *sensor,
 426                                        int pad, int fimc_id)
 427 {
 428         struct fimc_sensor_info *s_info;
 429         struct media_entity *sink;
 430         unsigned int flags;
 431         int ret, i;
 432
 433         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 434                 if (!fmd->fimc[i])
 435                         break;
 436                 /*
 437                  * Some FIMC variants are not fitted with camera capture
 438                  * interface. Skip creating a link from sensor for those.
 439                  */
 440                 if (sensor->grp_id == SENSOR_GROUP_ID &&
 441                     !fmd->fimc[i]->variant->has_cam_if)
 442                         continue;
 443
 444                 flags = (i == fimc_id) ? MEDIA_LNK_FL_ENABLED : 0;
 445                 sink = &fmd->fimc[i]->vid_cap.subdev->entity;
 446                 ret = media_entity_create_link(source, pad, sink,
 447                                               FIMC_SD_PAD_SINK, flags);
 448                 if (ret)
 449                         return ret;
 450
 451                 /* Notify FIMC capture subdev entity */
 452                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 453                                         &source->pads[pad], flags);
 454                 if (ret)
 455                         break;
 456
 457                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]",
 458                           source->name, flags ? '=' : '-', sink->name);
 459
 460                 if (flags == 0)
 461                         continue;
 462                 s_info = v4l2_get_subdev_hostdata(sensor);
 463                 if (!WARN_ON(s_info == NULL)) {
 464                         unsigned long irq_flags;
 465                         spin_lock_irqsave(&fmd->slock, irq_flags);
 466                         s_info->host = fmd->fimc[i];
 467                         spin_unlock_irqrestore(&fmd->slock, irq_flags);
 468                 }
 469         }
 470         return 0;
 471 }
 472
 473 /**
 474  * fimc_md_create_links - create default links between registered entities
 475  *
 476  * Parallel interface sensor entities are connected directly to FIMC capture
 477  * entities. The sensors using MIPI CSIS bus are connected through immutable
 478  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 479  * entity has a link to each registered FIMC capture entity. Enabled links
 480  * are created by default between each subsequent registered sensor and
 481  * subsequent FIMC capture entity. The number of default active links is
 482  * determined by the number of available sensors or FIMC entities,
 483  * whichever is less.
 484  */
 485 static int fimc_md_create_links(struct fimc_md *fmd)
 486 {
 487         struct v4l2_subdev *sensor, *csis;
 488         struct s5p_fimc_isp_info *pdata;
 489         struct fimc_sensor_info *s_info;
 490         struct media_entity *source, *sink;
 491         int i, pad, fimc_id = 0;
 492         int ret = 0;
 493         u32 flags;
 494
 495         for (i = 0; i < fmd->num_sensors; i++) {
 496                 if (fmd->sensor[i].subdev == NULL)
 497                         continue;
 498
 499                 sensor = fmd->sensor[i].subdev;
 500                 s_info = v4l2_get_subdev_hostdata(sensor);
 501                 if (!s_info || !s_info->pdata)
 502                         continue;
 503
 504                 source = NULL;
 505                 pdata = s_info->pdata;
 506
 507                 switch (pdata->bus_type) {
 508                 case FIMC_MIPI_CSI2:
 509                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 510                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 511                                 return -EINVAL;
 512
 513                         csis = fmd->csis[pdata->mux_id].sd;
 514                         if (WARN(csis == NULL,
 515                                  "MIPI-CSI interface specified "
 516                                  "but s5p-csis module is not loaded!\n"))
 517                                 return -EINVAL;
 518
 519                         ret = media_entity_create_link(&sensor->entity, 0,
 520                                               &csis->entity, CSIS_PAD_SINK,
 521                                               MEDIA_LNK_FL_IMMUTABLE |
 522                                               MEDIA_LNK_FL_ENABLED);
 523                         if (ret)
 524                                 return ret;
 525
 526                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]",
 527                                   sensor->entity.name, csis->entity.name);
 528
 529                         source = &csis->entity;
 530                         pad = CSIS_PAD_SOURCE;
 531                         break;
 532
 533                 case FIMC_ITU_601...FIMC_ITU_656:
 534                         source = &sensor->entity;
 535                         pad = 0;
 536                         break;
 537
 538                 default:
 539                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 540                                  pdata->bus_type);
 541                         return -EINVAL;
 542                 }
 543                 if (source == NULL)
 544                         continue;
 545
 546                 ret = __fimc_md_create_fimc_links(fmd, source, sensor, pad,
 547                                                   fimc_id++);
 548         }
 549         /* Create immutable links between each FIMC's subdev and video node */
 550         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 551         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 552                 if (!fmd->fimc[i])
 553                         continue;
 554                 source = &fmd->fimc[i]->vid_cap.subdev->entity;
 555                 sink = &fmd->fimc[i]->vid_cap.vfd->entity;
 556                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
 557                                               sink, 0, flags);
 558                 if (ret)
 559                         break;
 560         }
 561
 562         return ret;
 563 }
 564
 565 /*
 566  * The peripheral sensor clock management.
 567  */
 568 static int fimc_md_get_clocks(struct fimc_md *fmd)
 569 {
 570         char clk_name[32];
 571         struct clk *clock;
 572         int i;
 573
 574         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
 575                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
 576                 clock = clk_get(NULL, clk_name);
 577                 if (IS_ERR_OR_NULL(clock)) {
 578                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s",
 579                                   clk_name);
 580                         return -ENXIO;
 581                 }
 582                 fmd->camclk[i].clock = clock;
 583         }
 584         return 0;
 585 }
 586
 587 static void fimc_md_put_clocks(struct fimc_md *fmd)
 588 {
 589         int i = FIMC_MAX_CAMCLKS;
 590
 591         while (--i >= 0) {
 592                 if (IS_ERR_OR_NULL(fmd->camclk[i].clock))
 593                         continue;
 594                 clk_put(fmd->camclk[i].clock);
 595                 fmd->camclk[i].clock = NULL;
 596         }
 597 }
 598
 599 static int __fimc_md_set_camclk(struct fimc_md *fmd,
 600                                          struct fimc_sensor_info *s_info,
 601                                          bool on)
 602 {
 603         struct s5p_fimc_isp_info *pdata = s_info->pdata;
 604         struct fimc_camclk_info *camclk;
 605         int ret = 0;
 606
 607         if (WARN_ON(pdata->clk_id >= FIMC_MAX_CAMCLKS) || fmd == NULL)
 608                 return -EINVAL;
 609
 610         if (s_info->clk_on == on)
 611                 return 0;
 612         camclk = &fmd->camclk[pdata->clk_id];
 613
 614         dbg("camclk %d, f: %lu, clk: %p, on: %d",
 615             pdata->clk_id, pdata->clk_frequency, camclk, on);
 616
 617         if (on) {
 618                 if (camclk->use_count > 0 &&
 619                     camclk->frequency != pdata->clk_frequency)
 620                         return -EINVAL;
 621
 622                 if (camclk->use_count++ == 0) {
 623                         clk_set_rate(camclk->clock, pdata->clk_frequency);
 624                         camclk->frequency = pdata->clk_frequency;
 625                         ret = clk_enable(camclk->clock);
 626                 }
 627                 s_info->clk_on = 1;
 628                 dbg("Enabled camclk %d: f: %lu", pdata->clk_id,
 629                     clk_get_rate(camclk->clock));
 630
 631                 return ret;
 632         }
 633
 634         if (WARN_ON(camclk->use_count == 0))
 635                 return 0;
 636
 637         if (--camclk->use_count == 0) {
 638                 clk_disable(camclk->clock);
 639                 s_info->clk_on = 0;
 640                 dbg("Disabled camclk %d", pdata->clk_id);
 641         }
 642         return ret;
 643 }
 644
 645 /**
 646  * fimc_md_set_camclk - peripheral sensor clock setup
 647  * @sd: sensor subdev to configure sclk_cam clock for
 648  * @on: 1 to enable or 0 to disable the clock
 649  *
 650  * There are 2 separate clock outputs available in the SoC for external
 651  * image processors. These clocks are shared between all registered FIMC
 652  * devices to which sensors can be attached, either directly or through
 653  * the MIPI CSI receiver. The clock is allowed here to be used by
 654  * multiple sensors concurrently if they use same frequency.
 655  * The per sensor subdev clk_on attribute helps to synchronize accesses
 656  * to the sclk_cam clocks from the video and media device nodes.
 657  * This function should only be called when the graph mutex is held.
 658  */
 659 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
 660 {
 661         struct fimc_sensor_info *s_info = v4l2_get_subdev_hostdata(sd);
 662         struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
 663
 664         return __fimc_md_set_camclk(fmd, s_info, on);
 665 }
 666
 667 static int fimc_md_link_notify(struct media_pad *source,
 668                                struct media_pad *sink, u32 flags)
 669 {
 670         struct v4l2_subdev *sd;
 671         struct fimc_dev *fimc;
 672         int ret = 0;
 673
 674         if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 675                 return 0;
 676
 677         sd = media_entity_to_v4l2_subdev(sink->entity);
 678         fimc = v4l2_get_subdevdata(sd);
 679
 680         if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 681                 ret = __fimc_pipeline_shutdown(fimc);
 682                 fimc->pipeline.sensor = NULL;
 683                 fimc->pipeline.csis = NULL;
 684
 685                 mutex_lock(&fimc->lock);
 686                 fimc_ctrls_delete(fimc->vid_cap.ctx);
 687                 mutex_unlock(&fimc->lock);
 688                 return ret;
 689         }
 690         /*
 691          * Link activation. Enable power of pipeline elements only if the
 692          * pipeline is already in use, i.e. its video node is opened.
 693          * Recreate the controls destroyed during the link deactivation.
 694          */
 695         mutex_lock(&fimc->lock);
 696         if (fimc->vid_cap.refcnt > 0) {
 697                 ret = __fimc_pipeline_initialize(fimc, source->entity, true);
 698                 if (!ret)
 699                         ret = fimc_capture_ctrls_create(fimc);
 700         }
 701         mutex_unlock(&fimc->lock);
 702
 703         return ret ? -EPIPE : ret;
 704 }
 705
 706 static ssize_t fimc_md_sysfs_show(struct device *dev,
 707                                   struct device_attribute *attr, char *buf)
 708 {
 709         struct platform_device *pdev = to_platform_device(dev);
 710         struct fimc_md *fmd = platform_get_drvdata(pdev);
 711
 712         if (fmd->user_subdev_api)
 713                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
 714
 715         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
 716 }
 717
 718 static ssize_t fimc_md_sysfs_store(struct device *dev,
 719                                    struct device_attribute *attr,
 720                                    const char *buf, size_t count)
 721 {
 722         struct platform_device *pdev = to_platform_device(dev);
 723         struct fimc_md *fmd = platform_get_drvdata(pdev);
 724         bool subdev_api;
 725         int i;
 726
 727         if (!strcmp(buf, "vid-dev\n"))
 728                 subdev_api = false;
 729         else if (!strcmp(buf, "sub-dev\n"))
 730                 subdev_api = true;
 731         else
 732                 return count;
 733
 734         fmd->user_subdev_api = subdev_api;
 735         for (i = 0; i < FIMC_MAX_DEVS; i++)
 736                 if (fmd->fimc[i])
 737                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
 738         return count;
 739 }
 740 /*
 741  * This device attribute is to select video pipeline configuration method.
 742  * There are following valid values:
 743  *  vid-dev - for V4L2 video node API only, subdevice will be configured
 744  *  by the host driver.
 745  *  sub-dev - for media controller API, subdevs must be configured in user
 746  *  space before starting streaming.
 747  */
 748 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
 749                    fimc_md_sysfs_show, fimc_md_sysfs_store);
 750
 751 static int __devinit fimc_md_probe(struct platform_device *pdev)
 752 {
 753         struct v4l2_device *v4l2_dev;
 754         struct fimc_md *fmd;
 755         int ret;
 756
 757         fmd = kzalloc(sizeof(struct fimc_md), GFP_KERNEL);
 758         if (!fmd)
 759                 return -ENOMEM;
 760
 761         spin_lock_init(&fmd->slock);
 762         fmd->pdev = pdev;
 763
 764         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
 765                 sizeof(fmd->media_dev.model));
 766         fmd->media_dev.link_notify = fimc_md_link_notify;
 767         fmd->media_dev.dev = &pdev->dev;
 768
 769         v4l2_dev = &fmd->v4l2_dev;
 770         v4l2_dev->mdev = &fmd->media_dev;
 771         v4l2_dev->notify = fimc_sensor_notify;
 772         snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s",
 773                  dev_name(&pdev->dev));
 774
 775         ret = v4l2_device_register(&pdev->dev, &fmd->v4l2_dev);
 776         if (ret < 0) {
 777                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
 778                 goto err1;
 779         }
 780         ret = media_device_register(&fmd->media_dev);
 781         if (ret < 0) {
 782                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
 783                 goto err2;
 784         }
 785         ret = fimc_md_get_clocks(fmd);
 786         if (ret)
 787                 goto err3;
 788
 789         fmd->user_subdev_api = false;
 790         ret = fimc_md_register_platform_entities(fmd);
 791         if (ret)
 792                 goto err3;
 793
 794         if (pdev->dev.platform_data) {
 795                 ret = fimc_md_register_sensor_entities(fmd);
 796                 if (ret)
 797                         goto err3;
 798         }
 799         ret = fimc_md_create_links(fmd);
 800         if (ret)
 801                 goto err3;
 802         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
 803         if (ret)
 804                 goto err3;
 805         ret = fimc_md_register_video_nodes(fmd);
 806         if (ret)
 807                 goto err3;
 808
 809         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
 810         if (!ret) {
 811                 platform_set_drvdata(pdev, fmd);
 812                 return 0;
 813         }
 814 err3:
 815         media_device_unregister(&fmd->media_dev);
 816         fimc_md_put_clocks(fmd);
 817         fimc_md_unregister_entities(fmd);
 818 err2:
 819         v4l2_device_unregister(&fmd->v4l2_dev);
 820 err1:
 821         kfree(fmd);
 822         return ret;
 823 }
 824
 825 static int __devexit fimc_md_remove(struct platform_device *pdev)
 826 {
 827         struct fimc_md *fmd = platform_get_drvdata(pdev);
 828
 829         if (!fmd)
 830                 return 0;
 831         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
 832         fimc_md_unregister_entities(fmd);
 833         media_device_unregister(&fmd->media_dev);
 834         fimc_md_put_clocks(fmd);
 835         kfree(fmd);
 836         return 0;
 837 }
 838
 839 static struct platform_driver fimc_md_driver = {
 840         .probe          = fimc_md_probe,
 841         .remove         = __devexit_p(fimc_md_remove),
 842         .driver = {
 843                 .name   = "s5p-fimc-md",
 844                 .owner  = THIS_MODULE,
 845         }
 846 };
 847
 848 int __init fimc_md_init(void)
 849 {
 850         int ret;
 851         request_module("s5p-csis");
 852         ret = fimc_register_driver();
 853         if (ret)
 854                 return ret;
 855         return platform_driver_register(&fimc_md_driver);
 856 }
 857 void __exit fimc_md_exit(void)
 858 {
 859         platform_driver_unregister(&fimc_md_driver);
 860         fimc_unregister_driver();
 861 }
 862
 863 module_init(fimc_md_init);
 864 module_exit(fimc_md_exit);
 865
 866 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 867 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
 868 MODULE_LICENSE("GPL");
 869 MODULE_VERSION("2.0.1");