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                 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
 238         if (!client)
 239                 return;
 240         v4l2_device_unregister_subdev(sd);
 241         i2c_unregister_device(client);
 242         i2c_put_adapter(client->adapter);
 243 }
 244
 245 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 246 {
 247         struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
 248         struct fimc_dev *fd = NULL;
 249         int num_clients, ret, i;
 250
 251         /*
 252          * Runtime resume one of the FIMC entities to make sure
 253          * the sclk_cam clocks are not globally disabled.
 254          */
 255         for (i = 0; !fd && i < ARRAY_SIZE(fmd->fimc); i++)
 256                 if (fmd->fimc[i])
 257                         fd = fmd->fimc[i];
 258         if (!fd)
 259                 return -ENXIO;
 260         ret = pm_runtime_get_sync(&fd->pdev->dev);
 261         if (ret < 0)
 262                 return ret;
 263
 264         WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
 265         num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));
 266
 267         fmd->num_sensors = num_clients;
 268         for (i = 0; i < num_clients; i++) {
 269                 fmd->sensor[i].pdata = &pdata->isp_info[i];
 270                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
 271                 if (ret)
 272                         break;
 273                 fmd->sensor[i].subdev =
 274                         fimc_md_register_sensor(fmd, &fmd->sensor[i]);
 275                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
 276                 if (ret)
 277                         break;
 278         }
 279         pm_runtime_put(&fd->pdev->dev);
 280         return ret;
 281 }
 282
 283 /*
 284  * MIPI CSIS and FIMC platform devices registration.
 285  */
 286 static int fimc_register_callback(struct device *dev, void *p)
 287 {
 288         struct fimc_dev *fimc = dev_get_drvdata(dev);
 289         struct fimc_md *fmd = p;
 290         int ret;
 291
 292         if (!fimc || !fimc->pdev)
 293                 return 0;
 294         if (fimc->pdev->id < 0 || fimc->pdev->id >= FIMC_MAX_DEVS)
 295                 return 0;
 296
 297         fmd->fimc[fimc->pdev->id] = fimc;
 298         ret = fimc_register_m2m_device(fimc, &fmd->v4l2_dev);
 299         if (ret)
 300                 return ret;
 301         ret = fimc_register_capture_device(fimc, &fmd->v4l2_dev);
 302         if (!ret)
 303                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 304         return ret;
 305 }
 306
 307 static int csis_register_callback(struct device *dev, void *p)
 308 {
 309         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 310         struct platform_device *pdev;
 311         struct fimc_md *fmd = p;
 312         int id, ret;
 313
 314         if (!sd)
 315                 return 0;
 316         pdev = v4l2_get_subdevdata(sd);
 317         if (!pdev || pdev->id < 0 || pdev->id >= CSIS_MAX_ENTITIES)
 318                 return 0;
 319         v4l2_info(sd, "csis%d sd: %s\n", pdev->id, sd->name);
 320
 321         id = pdev->id < 0 ? 0 : pdev->id;
 322         fmd->csis[id].sd = sd;
 323         sd->grp_id = CSIS_GROUP_ID;
 324         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 325         if (ret)
 326                 v4l2_err(&fmd->v4l2_dev,
 327                          "Failed to register CSIS subdevice: %d\n", ret);
 328         return ret;
 329 }
 330
 331 /**
 332  * fimc_md_register_platform_entities - register FIMC and CSIS media entities
 333  */
 334 static int fimc_md_register_platform_entities(struct fimc_md *fmd)
 335 {
 336         struct device_driver *driver;
 337         int ret;
 338
 339         driver = driver_find(FIMC_MODULE_NAME, &platform_bus_type);
 340         if (!driver)
 341                 return -ENODEV;
 342         ret = driver_for_each_device(driver, NULL, fmd,
 343                                      fimc_register_callback);
 344         put_driver(driver);
 345         if (ret)
 346                 return ret;
 347
 348         driver = driver_find(CSIS_DRIVER_NAME, &platform_bus_type);
 349         if (driver) {
 350                 ret = driver_for_each_device(driver, NULL, fmd,
 351                                              csis_register_callback);
 352                 put_driver(driver);
 353         }
 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         int i, ret = 0;
 385
 386         for (i = 0; i < FIMC_MAX_DEVS && !ret; i++) {
 387                 if (!fmd->fimc[i])
 388                         continue;
 389
 390                 if (fmd->fimc[i]->m2m.vfd)
 391                         ret = video_register_device(fmd->fimc[i]->m2m.vfd,
 392                                                     VFL_TYPE_GRABBER, -1);
 393                 if (ret)
 394                         break;
 395                 if (fmd->fimc[i]->vid_cap.vfd)
 396                         ret = video_register_device(fmd->fimc[i]->vid_cap.vfd,
 397                                                     VFL_TYPE_GRABBER, -1);
 398         }
 399
 400         return ret;
 401 }
 402
 403 /**
 404  * __fimc_md_create_fimc_links - create links to all FIMC entities
 405  * @fmd: fimc media device
 406  * @source: the source entity to create links to all fimc entities from
 407  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 408  * @pad: the source entity pad index
 409  * @fimc_id: index of the fimc device for which link should be enabled
 410  */
 411 static int __fimc_md_create_fimc_links(struct fimc_md *fmd,
 412                                        struct media_entity *source,
 413                                        struct v4l2_subdev *sensor,
 414                                        int pad, int fimc_id)
 415 {
 416         struct fimc_sensor_info *s_info;
 417         struct media_entity *sink;
 418         unsigned int flags;
 419         int ret, i;
 420
 421         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 422                 if (!fmd->fimc[i])
 423                         break;
 424                 /*
 425                  * Some FIMC variants are not fitted with camera capture
 426                  * interface. Skip creating a link from sensor for those.
 427                  */
 428                 if (sensor->grp_id == SENSOR_GROUP_ID &&
 429                     !fmd->fimc[i]->variant->has_cam_if)
 430                         continue;
 431
 432                 flags = (i == fimc_id) ? MEDIA_LNK_FL_ENABLED : 0;
 433                 sink = &fmd->fimc[i]->vid_cap.subdev->entity;
 434                 ret = media_entity_create_link(source, pad, sink,
 435                                               FIMC_SD_PAD_SINK, flags);
 436                 if (ret)
 437                         return ret;
 438
 439                 /* Notify FIMC capture subdev entity */
 440                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 441                                         &source->pads[pad], flags);
 442                 if (ret)
 443                         break;
 444
 445                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]",
 446                           source->name, flags ? '=' : '-', sink->name);
 447
 448                 if (flags == 0)
 449                         continue;
 450                 s_info = v4l2_get_subdev_hostdata(sensor);
 451                 if (!WARN_ON(s_info == NULL)) {
 452                         unsigned long irq_flags;
 453                         spin_lock_irqsave(&fmd->slock, irq_flags);
 454                         s_info->host = fmd->fimc[i];
 455                         spin_unlock_irqrestore(&fmd->slock, irq_flags);
 456                 }
 457         }
 458         return 0;
 459 }
 460
 461 /**
 462  * fimc_md_create_links - create default links between registered entities
 463  *
 464  * Parallel interface sensor entities are connected directly to FIMC capture
 465  * entities. The sensors using MIPI CSIS bus are connected through immutable
 466  * link with CSI receiver entity specified by mux_id. Any registered CSIS
 467  * entity has a link to each registered FIMC capture entity. Enabled links
 468  * are created by default between each subsequent registered sensor and
 469  * subsequent FIMC capture entity. The number of default active links is
 470  * determined by the number of available sensors or FIMC entities,
 471  * whichever is less.
 472  */
 473 static int fimc_md_create_links(struct fimc_md *fmd)
 474 {
 475         struct v4l2_subdev *sensor, *csis;
 476         struct s5p_fimc_isp_info *pdata;
 477         struct fimc_sensor_info *s_info;
 478         struct media_entity *source, *sink;
 479         int i, pad, fimc_id = 0;
 480         int ret = 0;
 481         u32 flags;
 482
 483         for (i = 0; i < fmd->num_sensors; i++) {
 484                 if (fmd->sensor[i].subdev == NULL)
 485                         continue;
 486
 487                 sensor = fmd->sensor[i].subdev;
 488                 s_info = v4l2_get_subdev_hostdata(sensor);
 489                 if (!s_info || !s_info->pdata)
 490                         continue;
 491
 492                 source = NULL;
 493                 pdata = s_info->pdata;
 494
 495                 switch (pdata->bus_type) {
 496                 case FIMC_MIPI_CSI2:
 497                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
 498                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
 499                                 return -EINVAL;
 500
 501                         csis = fmd->csis[pdata->mux_id].sd;
 502                         if (WARN(csis == NULL,
 503                                  "MIPI-CSI interface specified "
 504                                  "but s5p-csis module is not loaded!\n"))
 505                                 continue;
 506
 507                         ret = media_entity_create_link(&sensor->entity, 0,
 508                                               &csis->entity, CSIS_PAD_SINK,
 509                                               MEDIA_LNK_FL_IMMUTABLE |
 510                                               MEDIA_LNK_FL_ENABLED);
 511                         if (ret)
 512                                 return ret;
 513
 514                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]",
 515                                   sensor->entity.name, csis->entity.name);
 516
 517                         source = &csis->entity;
 518                         pad = CSIS_PAD_SOURCE;
 519                         break;
 520
 521                 case FIMC_ITU_601...FIMC_ITU_656:
 522                         source = &sensor->entity;
 523                         pad = 0;
 524                         break;
 525
 526                 default:
 527                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
 528                                  pdata->bus_type);
 529                         return -EINVAL;
 530                 }
 531                 if (source == NULL)
 532                         continue;
 533
 534                 ret = __fimc_md_create_fimc_links(fmd, source, sensor, pad,
 535                                                   fimc_id++);
 536         }
 537         /* Create immutable links between each FIMC's subdev and video node */
 538         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
 539         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 540                 if (!fmd->fimc[i])
 541                         continue;
 542                 source = &fmd->fimc[i]->vid_cap.subdev->entity;
 543                 sink = &fmd->fimc[i]->vid_cap.vfd->entity;
 544                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
 545                                               sink, 0, flags);
 546                 if (ret)
 547                         break;
 548         }
 549
 550         return ret;
 551 }
 552
 553 /*
 554  * The peripheral sensor clock management.
 555  */
 556 static int fimc_md_get_clocks(struct fimc_md *fmd)
 557 {
 558         char clk_name[32];
 559         struct clk *clock;
 560         int i;
 561
 562         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
 563                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
 564                 clock = clk_get(NULL, clk_name);
 565                 if (IS_ERR_OR_NULL(clock)) {
 566                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s",
 567                                   clk_name);
 568                         return -ENXIO;
 569                 }
 570                 fmd->camclk[i].clock = clock;
 571         }
 572         return 0;
 573 }
 574
 575 static void fimc_md_put_clocks(struct fimc_md *fmd)
 576 {
 577         int i = FIMC_MAX_CAMCLKS;
 578
 579         while (--i >= 0) {
 580                 if (IS_ERR_OR_NULL(fmd->camclk[i].clock))
 581                         continue;
 582                 clk_put(fmd->camclk[i].clock);
 583                 fmd->camclk[i].clock = NULL;
 584         }
 585 }
 586
 587 static int __fimc_md_set_camclk(struct fimc_md *fmd,
 588                                          struct fimc_sensor_info *s_info,
 589                                          bool on)
 590 {
 591         struct s5p_fimc_isp_info *pdata = s_info->pdata;
 592         struct fimc_camclk_info *camclk;
 593         int ret = 0;
 594
 595         if (WARN_ON(pdata->clk_id >= FIMC_MAX_CAMCLKS) || fmd == NULL)
 596                 return -EINVAL;
 597
 598         if (s_info->clk_on == on)
 599                 return 0;
 600         camclk = &fmd->camclk[pdata->clk_id];
 601
 602         dbg("camclk %d, f: %lu, clk: %p, on: %d",
 603             pdata->clk_id, pdata->clk_frequency, camclk, on);
 604
 605         if (on) {
 606                 if (camclk->use_count > 0 &&
 607                     camclk->frequency != pdata->clk_frequency)
 608                         return -EINVAL;
 609
 610                 if (camclk->use_count++ == 0) {
 611                         clk_set_rate(camclk->clock, pdata->clk_frequency);
 612                         camclk->frequency = pdata->clk_frequency;
 613                         ret = clk_enable(camclk->clock);
 614                 }
 615                 s_info->clk_on = 1;
 616                 dbg("Enabled camclk %d: f: %lu", pdata->clk_id,
 617                     clk_get_rate(camclk->clock));
 618
 619                 return ret;
 620         }
 621
 622         if (WARN_ON(camclk->use_count == 0))
 623                 return 0;
 624
 625         if (--camclk->use_count == 0) {
 626                 clk_disable(camclk->clock);
 627                 s_info->clk_on = 0;
 628                 dbg("Disabled camclk %d", pdata->clk_id);
 629         }
 630         return ret;
 631 }
 632
 633 /**
 634  * fimc_md_set_camclk - peripheral sensor clock setup
 635  * @sd: sensor subdev to configure sclk_cam clock for
 636  * @on: 1 to enable or 0 to disable the clock
 637  *
 638  * There are 2 separate clock outputs available in the SoC for external
 639  * image processors. These clocks are shared between all registered FIMC
 640  * devices to which sensors can be attached, either directly or through
 641  * the MIPI CSI receiver. The clock is allowed here to be used by
 642  * multiple sensors concurrently if they use same frequency.
 643  * The per sensor subdev clk_on attribute helps to synchronize accesses
 644  * to the sclk_cam clocks from the video and media device nodes.
 645  * This function should only be called when the graph mutex is held.
 646  */
 647 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
 648 {
 649         struct fimc_sensor_info *s_info = v4l2_get_subdev_hostdata(sd);
 650         struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
 651
 652         return __fimc_md_set_camclk(fmd, s_info, on);
 653 }
 654
 655 static int fimc_md_link_notify(struct media_pad *source,
 656                                struct media_pad *sink, u32 flags)
 657 {
 658         struct v4l2_subdev *sd;
 659         struct fimc_dev *fimc;
 660         int ret = 0;
 661
 662         if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 663                 return 0;
 664
 665         sd = media_entity_to_v4l2_subdev(sink->entity);
 666         fimc = v4l2_get_subdevdata(sd);
 667
 668         if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 669                 ret = __fimc_pipeline_shutdown(fimc);
 670                 fimc->pipeline.sensor = NULL;
 671                 fimc->pipeline.csis = NULL;
 672
 673                 mutex_lock(&fimc->lock);
 674                 fimc_ctrls_delete(fimc->vid_cap.ctx);
 675                 mutex_unlock(&fimc->lock);
 676                 return ret;
 677         }
 678         /*
 679          * Link activation. Enable power of pipeline elements only if the
 680          * pipeline is already in use, i.e. its video node is opened.
 681          * Recreate the controls destroyed during the link deactivation.
 682          */
 683         mutex_lock(&fimc->lock);
 684         if (fimc->vid_cap.refcnt > 0) {
 685                 ret = __fimc_pipeline_initialize(fimc, source->entity, true);
 686                 if (!ret)
 687                         ret = fimc_capture_ctrls_create(fimc);
 688         }
 689         mutex_unlock(&fimc->lock);
 690
 691         return ret ? -EPIPE : ret;
 692 }
 693
 694 static ssize_t fimc_md_sysfs_show(struct device *dev,
 695                                   struct device_attribute *attr, char *buf)
 696 {
 697         struct platform_device *pdev = to_platform_device(dev);
 698         struct fimc_md *fmd = platform_get_drvdata(pdev);
 699
 700         if (fmd->user_subdev_api)
 701                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
 702
 703         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
 704 }
 705
 706 static ssize_t fimc_md_sysfs_store(struct device *dev,
 707                                    struct device_attribute *attr,
 708                                    const char *buf, size_t count)
 709 {
 710         struct platform_device *pdev = to_platform_device(dev);
 711         struct fimc_md *fmd = platform_get_drvdata(pdev);
 712         bool subdev_api;
 713         int i;
 714
 715         if (!strcmp(buf, "vid-dev\n"))
 716                 subdev_api = false;
 717         else if (!strcmp(buf, "sub-dev\n"))
 718                 subdev_api = true;
 719         else
 720                 return count;
 721
 722         fmd->user_subdev_api = subdev_api;
 723         for (i = 0; i < FIMC_MAX_DEVS; i++)
 724                 if (fmd->fimc[i])
 725                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
 726         return count;
 727 }
 728 /*
 729  * This device attribute is to select video pipeline configuration method.
 730  * There are following valid values:
 731  *  vid-dev - for V4L2 video node API only, subdevice will be configured
 732  *  by the host driver.
 733  *  sub-dev - for media controller API, subdevs must be configured in user
 734  *  space before starting streaming.
 735  */
 736 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
 737                    fimc_md_sysfs_show, fimc_md_sysfs_store);
 738
 739 static int __devinit fimc_md_probe(struct platform_device *pdev)
 740 {
 741         struct v4l2_device *v4l2_dev;
 742         struct fimc_md *fmd;
 743         int ret;
 744
 745         if (WARN(!pdev->dev.platform_data, "Platform data not specified!\n"))
 746                 return -EINVAL;
 747
 748         fmd = kzalloc(sizeof(struct fimc_md), GFP_KERNEL);
 749         if (!fmd)
 750                 return -ENOMEM;
 751
 752         spin_lock_init(&fmd->slock);
 753         fmd->pdev = pdev;
 754
 755         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
 756                 sizeof(fmd->media_dev.model));
 757         fmd->media_dev.link_notify = fimc_md_link_notify;
 758         fmd->media_dev.dev = &pdev->dev;
 759
 760         v4l2_dev = &fmd->v4l2_dev;
 761         v4l2_dev->mdev = &fmd->media_dev;
 762         v4l2_dev->notify = fimc_sensor_notify;
 763         snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s",
 764                  dev_name(&pdev->dev));
 765
 766         ret = v4l2_device_register(&pdev->dev, &fmd->v4l2_dev);
 767         if (ret < 0) {
 768                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
 769                 goto err1;
 770         }
 771         ret = media_device_register(&fmd->media_dev);
 772         if (ret < 0) {
 773                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
 774                 goto err2;
 775         }
 776         ret = fimc_md_get_clocks(fmd);
 777         if (ret)
 778                 goto err3;
 779
 780         fmd->user_subdev_api = false;
 781         ret = fimc_md_register_platform_entities(fmd);
 782         if (ret)
 783                 goto err3;
 784
 785         ret = fimc_md_register_sensor_entities(fmd);
 786         if (ret)
 787                 goto err3;
 788         ret = fimc_md_create_links(fmd);
 789         if (ret)
 790                 goto err3;
 791         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
 792         if (ret)
 793                 goto err3;
 794         ret = fimc_md_register_video_nodes(fmd);
 795         if (ret)
 796                 goto err3;
 797
 798         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
 799         if (!ret) {
 800                 platform_set_drvdata(pdev, fmd);
 801                 return 0;
 802         }
 803 err3:
 804         media_device_unregister(&fmd->media_dev);
 805         fimc_md_put_clocks(fmd);
 806         fimc_md_unregister_entities(fmd);
 807 err2:
 808         v4l2_device_unregister(&fmd->v4l2_dev);
 809 err1:
 810         kfree(fmd);
 811         return ret;
 812 }
 813
 814 static int __devexit fimc_md_remove(struct platform_device *pdev)
 815 {
 816         struct fimc_md *fmd = platform_get_drvdata(pdev);
 817
 818         if (!fmd)
 819                 return 0;
 820         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
 821         fimc_md_unregister_entities(fmd);
 822         media_device_unregister(&fmd->media_dev);
 823         fimc_md_put_clocks(fmd);
 824         kfree(fmd);
 825         return 0;
 826 }
 827
 828 static struct platform_driver fimc_md_driver = {
 829         .probe          = fimc_md_probe,
 830         .remove         = __devexit_p(fimc_md_remove),
 831         .driver = {
 832                 .name   = "s5p-fimc-md",
 833                 .owner  = THIS_MODULE,
 834         }
 835 };
 836
 837 int __init fimc_md_init(void)
 838 {
 839         int ret;
 840         request_module("s5p-csis");
 841         ret = fimc_register_driver();
 842         if (ret)
 843                 return ret;
 844         return platform_driver_register(&fimc_md_driver);
 845 }
 846 void __exit fimc_md_exit(void)
 847 {
 848         platform_driver_unregister(&fimc_md_driver);
 849         fimc_unregister_driver();
 850 }
 851
 852 module_init(fimc_md_init);
 853 module_exit(fimc_md_exit);
 854
 855 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 856 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
 857 MODULE_LICENSE("GPL");
 858 MODULE_VERSION("2.0.1");