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

   1 /*
   2  * S5P/EXYNOS4 SoC series camera host interface media device driver
   3  *
   4  * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
   5  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 2 of the License,
  10  * or (at your option) any later version.
  11  */
  12
  13 #include <linux/bug.h>
  14 #include <linux/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/of.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/of_device.h>
  23 #include <linux/of_graph.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/types.h>
  27 #include <linux/slab.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-of.h>
  30 #include <media/media-device.h>
  31 #include <media/s5p_fimc.h>
  32
  33 #include "media-dev.h"
  34 #include "fimc-core.h"
  35 #include "fimc-is.h"
  36 #include "fimc-lite.h"
  37 #include "mipi-csis.h"
  38
  39 static int __fimc_md_set_camclk(struct fimc_md *fmd,
  40                                 struct fimc_source_info *si,
  41                                 bool on);
  42
  43 /* Set up image sensor subdev -> FIMC capture node notifications. */
  44 static void __setup_sensor_notification(struct fimc_md *fmd,
  45                                         struct v4l2_subdev *sensor,
  46                                         struct v4l2_subdev *fimc_sd)
  47 {
  48         struct fimc_source_info *src_inf;
  49         struct fimc_sensor_info *md_si;
  50         unsigned long flags;
  51
  52         src_inf = v4l2_get_subdev_hostdata(sensor);
  53         if (!src_inf || WARN_ON(fmd == NULL))
  54                 return;
  55
  56         md_si = source_to_sensor_info(src_inf);
  57         spin_lock_irqsave(&fmd->slock, flags);
  58         md_si->host = v4l2_get_subdevdata(fimc_sd);
  59         spin_unlock_irqrestore(&fmd->slock, flags);
  60 }
  61
  62 /**
  63  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
  64  * @me: media entity terminating the pipeline
  65  *
  66  * Caller holds the graph mutex.
  67  */
  68 static void fimc_pipeline_prepare(struct fimc_pipeline *p,
  69                                         struct media_entity *me)
  70 {
  71         struct fimc_md *fmd = entity_to_fimc_mdev(me);
  72         struct v4l2_subdev *sd;
  73         struct v4l2_subdev *sensor = NULL;
  74         int i;
  75
  76         for (i = 0; i < IDX_MAX; i++)
  77                 p->subdevs[i] = NULL;
  78
  79         while (1) {
  80                 struct media_pad *pad = NULL;
  81
  82                 /* Find remote source pad */
  83                 for (i = 0; i < me->num_pads; i++) {
  84                         struct media_pad *spad = &me->pads[i];
  85                         if (!(spad->flags & MEDIA_PAD_FL_SINK))
  86                                 continue;
  87                         pad = media_entity_remote_pad(spad);
  88                         if (pad)
  89                                 break;
  90                 }
  91
  92                 if (pad == NULL ||
  93                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
  94                         break;
  95                 sd = media_entity_to_v4l2_subdev(pad->entity);
  96
  97                 switch (sd->grp_id) {
  98                 case GRP_ID_SENSOR:
  99                         sensor = sd;
 100                         /* fall through */
 101                 case GRP_ID_FIMC_IS_SENSOR:
 102                         p->subdevs[IDX_SENSOR] = sd;
 103                         break;
 104                 case GRP_ID_CSIS:
 105                         p->subdevs[IDX_CSIS] = sd;
 106                         break;
 107                 case GRP_ID_FLITE:
 108                         p->subdevs[IDX_FLITE] = sd;
 109                         break;
 110                 case GRP_ID_FIMC:
 111                         p->subdevs[IDX_FIMC] = sd;
 112                         break;
 113                 case GRP_ID_FIMC_IS:
 114                         p->subdevs[IDX_IS_ISP] = sd;
 115                         break;
 116                 default:
 117                         break;
 118                 }
 119                 me = &sd->entity;
 120                 if (me->num_pads == 1)
 121                         break;
 122         }
 123
 124         if (sensor && p->subdevs[IDX_FIMC])
 125                 __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
 126 }
 127
 128 /**
 129  * __subdev_set_power - change power state of a single subdev
 130  * @sd: subdevice to change power state for
 131  * @on: 1 to enable power or 0 to disable
 132  *
 133  * Return result of s_power subdev operation or -ENXIO if sd argument
 134  * is NULL. Return 0 if the subdevice does not implement s_power.
 135  */
 136 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
 137 {
 138         int *use_count;
 139         int ret;
 140
 141         if (sd == NULL)
 142                 return -ENXIO;
 143
 144         use_count = &sd->entity.use_count;
 145         if (on && (*use_count)++ > 0)
 146                 return 0;
 147         else if (!on && (*use_count == 0 || --(*use_count) > 0))
 148                 return 0;
 149         ret = v4l2_subdev_call(sd, core, s_power, on);
 150
 151         return ret != -ENOIOCTLCMD ? ret : 0;
 152 }
 153
 154 /**
 155  * fimc_pipeline_s_power - change power state of all pipeline subdevs
 156  * @fimc: fimc device terminating the pipeline
 157  * @state: true to power on, false to power off
 158  *
 159  * Needs to be called with the graph mutex held.
 160  */
 161 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
 162 {
 163         static const u8 seq[2][IDX_MAX - 1] = {
 164                 { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
 165                 { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
 166         };
 167         int i, ret = 0;
 168
 169         if (p->subdevs[IDX_SENSOR] == NULL)
 170                 return -ENXIO;
 171
 172         for (i = 0; i < IDX_MAX - 1; i++) {
 173                 unsigned int idx = seq[on][i];
 174
 175                 ret = __subdev_set_power(p->subdevs[idx], on);
 176
 177
 178                 if (ret < 0 && ret != -ENXIO)
 179                         goto error;
 180         }
 181         return 0;
 182 error:
 183         for (; i >= 0; i--) {
 184                 unsigned int idx = seq[on][i];
 185                 __subdev_set_power(p->subdevs[idx], !on);
 186         }
 187         return ret;
 188 }
 189
 190 /**
 191  * __fimc_pipeline_open - update the pipeline information, enable power
 192  *                        of all pipeline subdevs and the sensor clock
 193  * @me: media entity to start graph walk with
 194  * @prepare: true to walk the current pipeline and acquire all subdevs
 195  *
 196  * Called with the graph mutex held.
 197  */
 198 static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
 199                                 struct media_entity *me, bool prepare)
 200 {
 201         struct fimc_md *fmd = entity_to_fimc_mdev(me);
 202         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 203         struct v4l2_subdev *sd;
 204         int ret;
 205
 206         if (WARN_ON(p == NULL || me == NULL))
 207                 return -EINVAL;
 208
 209         if (prepare)
 210                 fimc_pipeline_prepare(p, me);
 211
 212         sd = p->subdevs[IDX_SENSOR];
 213         if (sd == NULL)
 214                 return -EINVAL;
 215
 216         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 217         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
 218                 ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
 219                 if (ret < 0)
 220                         return ret;
 221         }
 222         ret = fimc_md_set_camclk(sd, true);
 223         if (ret < 0)
 224                 goto err_wbclk;
 225
 226         ret = fimc_pipeline_s_power(p, 1);
 227         if (!ret)
 228                 return 0;
 229
 230         fimc_md_set_camclk(sd, false);
 231
 232 err_wbclk:
 233         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 234                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 235
 236         return ret;
 237 }
 238
 239 /**
 240  * __fimc_pipeline_close - disable the sensor clock and pipeline power
 241  * @fimc: fimc device terminating the pipeline
 242  *
 243  * Disable power of all subdevs and turn the external sensor clock off.
 244  */
 245 static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
 246 {
 247         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 248         struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
 249         struct fimc_md *fmd;
 250         int ret;
 251
 252         if (sd == NULL) {
 253                 pr_warn("%s(): No sensor subdev\n", __func__);
 254                 return 0;
 255         }
 256
 257         ret = fimc_pipeline_s_power(p, 0);
 258         fimc_md_set_camclk(sd, false);
 259
 260         fmd = entity_to_fimc_mdev(&sd->entity);
 261
 262         /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
 263         if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
 264                 clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);
 265
 266         return ret == -ENXIO ? 0 : ret;
 267 }
 268
 269 /**
 270  * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 271  * @pipeline: video pipeline structure
 272  * @on: passed as the s_stream() callback argument
 273  */
 274 static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 275 {
 276         static const u8 seq[2][IDX_MAX] = {
 277                 { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
 278                 { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 279         };
 280         struct fimc_pipeline *p = to_fimc_pipeline(ep);
 281         int i, ret = 0;
 282
 283         if (p->subdevs[IDX_SENSOR] == NULL)
 284                 return -ENODEV;
 285
 286         for (i = 0; i < IDX_MAX; i++) {
 287                 unsigned int idx = seq[on][i];
 288
 289                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
 290
 291                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 292                         goto error;
 293         }
 294         return 0;
 295 error:
 296         for (; i >= 0; i--) {
 297                 unsigned int idx = seq[on][i];
 298                 v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
 299         }
 300         return ret;
 301 }
 302
 303 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
 304 static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
 305         .open           = __fimc_pipeline_open,
 306         .close          = __fimc_pipeline_close,
 307         .set_stream     = __fimc_pipeline_s_stream,
 308 };
 309
 310 static struct exynos_media_pipeline *fimc_md_pipeline_create(
 311                                                 struct fimc_md *fmd)
 312 {
 313         struct fimc_pipeline *p;
 314
 315         p = kzalloc(sizeof(*p), GFP_KERNEL);
 316         if (!p)
 317                 return NULL;
 318
 319         list_add_tail(&p->list, &fmd->pipelines);
 320
 321         p->ep.ops = &fimc_pipeline_ops;
 322         return &p->ep;
 323 }
 324
 325 static void fimc_md_pipelines_free(struct fimc_md *fmd)
 326 {
 327         while (!list_empty(&fmd->pipelines)) {
 328                 struct fimc_pipeline *p;
 329
 330                 p = list_entry(fmd->pipelines.next, typeof(*p), list);
 331                 list_del(&p->list);
 332                 kfree(p);
 333         }
 334 }
 335
 336 /*
 337  * Sensor subdevice helper functions
 338  */
 339 static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
 340                                                 struct fimc_source_info *si)
 341 {
 342         struct i2c_adapter *adapter;
 343         struct v4l2_subdev *sd = NULL;
 344
 345         if (!si || !fmd)
 346                 return NULL;
 347         /*
 348          * If FIMC bus type is not Writeback FIFO assume it is same
 349          * as sensor_bus_type.
 350          */
 351         si->fimc_bus_type = si->sensor_bus_type;
 352
 353         adapter = i2c_get_adapter(si->i2c_bus_num);
 354         if (!adapter) {
 355                 v4l2_warn(&fmd->v4l2_dev,
 356                           "Failed to get I2C adapter %d, deferring probe\n",
 357                           si->i2c_bus_num);
 358                 return ERR_PTR(-EPROBE_DEFER);
 359         }
 360         sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,
 361                                                 si->board_info, NULL);
 362         if (IS_ERR_OR_NULL(sd)) {
 363                 i2c_put_adapter(adapter);
 364                 v4l2_warn(&fmd->v4l2_dev,
 365                           "Failed to acquire subdev %s, deferring probe\n",
 366                           si->board_info->type);
 367                 return ERR_PTR(-EPROBE_DEFER);
 368         }
 369         v4l2_set_subdev_hostdata(sd, si);
 370         sd->grp_id = GRP_ID_SENSOR;
 371
 372         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
 373                   sd->name);
 374         return sd;
 375 }
 376
 377 static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
 378 {
 379         struct i2c_client *client = v4l2_get_subdevdata(sd);
 380         struct i2c_adapter *adapter;
 381
 382         if (!client)
 383                 return;
 384
 385         v4l2_device_unregister_subdev(sd);
 386
 387         if (!client->dev.of_node) {
 388                 adapter = client->adapter;
 389                 i2c_unregister_device(client);
 390                 if (adapter)
 391                         i2c_put_adapter(adapter);
 392         }
 393 }
 394
 395 #ifdef CONFIG_OF
 396 /* Register I2C client subdev associated with @node. */
 397 static int fimc_md_of_add_sensor(struct fimc_md *fmd,
 398                                  struct device_node *node, int index)
 399 {
 400         struct fimc_sensor_info *si;
 401         struct i2c_client *client;
 402         struct v4l2_subdev *sd;
 403         int ret;
 404
 405         if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor)))
 406                 return -EINVAL;
 407         si = &fmd->sensor[index];
 408
 409         client = of_find_i2c_device_by_node(node);
 410         if (!client)
 411                 return -EPROBE_DEFER;
 412
 413         device_lock(&client->dev);
 414
 415         if (!client->dev.driver ||
 416             !try_module_get(client->dev.driver->owner)) {
 417                 ret = -EPROBE_DEFER;
 418                 v4l2_info(&fmd->v4l2_dev, "No driver found for %s\n",
 419                                                 node->full_name);
 420                 goto dev_put;
 421         }
 422
 423         /* Enable sensor's master clock */
 424         ret = __fimc_md_set_camclk(fmd, &si->pdata, true);
 425         if (ret < 0)
 426                 goto mod_put;
 427         sd = i2c_get_clientdata(client);
 428
 429         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 430         __fimc_md_set_camclk(fmd, &si->pdata, false);
 431         if (ret < 0)
 432                 goto mod_put;
 433
 434         v4l2_set_subdev_hostdata(sd, &si->pdata);
 435         if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 436                 sd->grp_id = GRP_ID_FIMC_IS_SENSOR;
 437         else
 438                 sd->grp_id = GRP_ID_SENSOR;
 439
 440         si->subdev = sd;
 441         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
 442                   sd->name, fmd->num_sensors);
 443         fmd->num_sensors++;
 444
 445 mod_put:
 446         module_put(client->dev.driver->owner);
 447 dev_put:
 448         device_unlock(&client->dev);
 449         put_device(&client->dev);
 450         return ret;
 451 }
 452
 453 /* Parse port node and register as a sub-device any sensor specified there. */
 454 static int fimc_md_parse_port_node(struct fimc_md *fmd,
 455                                    struct device_node *port,
 456                                    unsigned int index)
 457 {
 458         struct device_node *rem, *ep, *np;
 459         struct fimc_source_info *pd;
 460         struct v4l2_of_endpoint endpoint;
 461         int ret;
 462         u32 val;
 463
 464         pd = &fmd->sensor[index].pdata;
 465
 466         /* Assume here a port node can have only one endpoint node. */
 467         ep = of_get_next_child(port, NULL);
 468         if (!ep)
 469                 return 0;
 470
 471         v4l2_of_parse_endpoint(ep, &endpoint);
 472         if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
 473                 return -EINVAL;
 474
 475         pd->mux_id = (endpoint.base.port - 1) & 0x1;
 476
 477         rem = of_graph_get_remote_port_parent(ep);
 478         of_node_put(ep);
 479         if (rem == NULL) {
 480                 v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
 481                                                         ep->full_name);
 482                 return 0;
 483         }
 484         if (!of_property_read_u32(rem, "samsung,camclk-out", &val))
 485                 pd->clk_id = val;
 486
 487         if (!of_property_read_u32(rem, "clock-frequency", &val))
 488                 pd->clk_frequency = val;
 489
 490         if (pd->clk_frequency == 0) {
 491                 v4l2_err(&fmd->v4l2_dev, "Wrong clock frequency at node %s\n",
 492                          rem->full_name);
 493                 of_node_put(rem);
 494                 return -EINVAL;
 495         }
 496
 497         if (fimc_input_is_parallel(endpoint.base.port)) {
 498                 if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
 499                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
 500                 else
 501                         pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
 502                 pd->flags = endpoint.bus.parallel.flags;
 503         } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
 504                 /*
 505                  * MIPI CSI-2: only input mux selection and
 506                  * the sensor's clock frequency is needed.
 507                  */
 508                 pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
 509         } else {
 510                 v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
 511                          endpoint.base.port, rem->full_name);
 512         }
 513         /*
 514          * For FIMC-IS handled sensors, that are placed under i2c-isp device
 515          * node, FIMC is connected to the FIMC-IS through its ISP Writeback
 516          * input. Sensors are attached to the FIMC-LITE hostdata interface
 517          * directly or through MIPI-CSIS, depending on the external media bus
 518          * used. This needs to be handled in a more reliable way, not by just
 519          * checking parent's node name.
 520          */
 521         np = of_get_parent(rem);
 522
 523         if (np && !of_node_cmp(np->name, "i2c-isp"))
 524                 pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
 525         else
 526                 pd->fimc_bus_type = pd->sensor_bus_type;
 527
 528         ret = fimc_md_of_add_sensor(fmd, rem, index);
 529         of_node_put(rem);
 530
 531         return ret;
 532 }
 533
 534 /* Register all SoC external sub-devices */
 535 static int fimc_md_of_sensors_register(struct fimc_md *fmd,
 536                                        struct device_node *np)
 537 {
 538         struct device_node *parent = fmd->pdev->dev.of_node;
 539         struct device_node *node, *ports;
 540         int index = 0;
 541         int ret;
 542
 543         /* Attach sensors linked to MIPI CSI-2 receivers */
 544         for_each_available_child_of_node(parent, node) {
 545                 struct device_node *port;
 546
 547                 if (of_node_cmp(node->name, "csis"))
 548                         continue;
 549                 /* The csis node can have only port subnode. */
 550                 port = of_get_next_child(node, NULL);
 551                 if (!port)
 552                         continue;
 553
 554                 ret = fimc_md_parse_port_node(fmd, port, index);
 555                 if (ret < 0)
 556                         return ret;
 557                 index++;
 558         }
 559
 560         /* Attach sensors listed in the parallel-ports node */
 561         ports = of_get_child_by_name(parent, "parallel-ports");
 562         if (!ports)
 563                 return 0;
 564
 565         for_each_child_of_node(ports, node) {
 566                 ret = fimc_md_parse_port_node(fmd, node, index);
 567                 if (ret < 0)
 568                         break;
 569                 index++;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int __of_get_csis_id(struct device_node *np)
 576 {
 577         u32 reg = 0;
 578
 579         np = of_get_child_by_name(np, "port");
 580         if (!np)
 581                 return -EINVAL;
 582         of_property_read_u32(np, "reg", &reg);
 583         return reg - FIMC_INPUT_MIPI_CSI2_0;
 584 }
 585 #else
 586 #define fimc_md_of_sensors_register(fmd, np) (-ENOSYS)
 587 #define __of_get_csis_id(np) (-ENOSYS)
 588 #endif
 589
 590 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 591 {
 592         struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
 593         struct device_node *of_node = fmd->pdev->dev.of_node;
 594         int num_clients = 0;
 595         int ret, i;
 596
 597         /*
 598          * Runtime resume one of the FIMC entities to make sure
 599          * the sclk_cam clocks are not globally disabled.
 600          */
 601         if (!fmd->pmf)
 602                 return -ENXIO;
 603
 604         ret = pm_runtime_get_sync(fmd->pmf);
 605         if (ret < 0)
 606                 return ret;
 607
 608         if (of_node) {
 609                 fmd->num_sensors = 0;
 610                 ret = fimc_md_of_sensors_register(fmd, of_node);
 611         } else if (pdata) {
 612                 WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
 613                 num_clients = min_t(u32, pdata->num_clients,
 614                                     ARRAY_SIZE(fmd->sensor));
 615                 fmd->num_sensors = num_clients;
 616
 617                 for (i = 0; i < num_clients; i++) {
 618                         struct fimc_sensor_info *si = &fmd->sensor[i];
 619                         struct v4l2_subdev *sd;
 620
 621                         si->pdata = pdata->source_info[i];
 622                         ret = __fimc_md_set_camclk(fmd, &si->pdata, true);
 623                         if (ret)
 624                                 break;
 625                         sd = fimc_md_register_sensor(fmd, &si->pdata);
 626                         ret = __fimc_md_set_camclk(fmd, &si->pdata, false);
 627
 628                         if (IS_ERR(sd)) {
 629                                 si->subdev = NULL;
 630                                 ret = PTR_ERR(sd);
 631                                 break;
 632                         }
 633                         si->subdev = sd;
 634                         if (ret)
 635                                 break;
 636                 }
 637         }
 638
 639         pm_runtime_put(fmd->pmf);
 640         return ret;
 641 }
 642
 643 /*
 644  * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 645  */
 646
 647 static int register_fimc_lite_entity(struct fimc_md *fmd,
 648                                      struct fimc_lite *fimc_lite)
 649 {
 650         struct v4l2_subdev *sd;
 651         struct exynos_media_pipeline *ep;
 652         int ret;
 653
 654         if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
 655                     fmd->fimc_lite[fimc_lite->index]))
 656                 return -EBUSY;
 657
 658         sd = &fimc_lite->subdev;
 659         sd->grp_id = GRP_ID_FLITE;
 660
 661         ep = fimc_md_pipeline_create(fmd);
 662         if (!ep)
 663                 return -ENOMEM;
 664
 665         v4l2_set_subdev_hostdata(sd, ep);
 666
 667         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 668         if (!ret)
 669                 fmd->fimc_lite[fimc_lite->index] = fimc_lite;
 670         else
 671                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
 672                          fimc_lite->index);
 673         return ret;
 674 }
 675
 676 static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
 677 {
 678         struct v4l2_subdev *sd;
 679         struct exynos_media_pipeline *ep;
 680         int ret;
 681
 682         if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
 683                 return -EBUSY;
 684
 685         sd = &fimc->vid_cap.subdev;
 686         sd->grp_id = GRP_ID_FIMC;
 687
 688         ep = fimc_md_pipeline_create(fmd);
 689         if (!ep)
 690                 return -ENOMEM;
 691
 692         v4l2_set_subdev_hostdata(sd, ep);
 693
 694         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 695         if (!ret) {
 696                 if (!fmd->pmf && fimc->pdev)
 697                         fmd->pmf = &fimc->pdev->dev;
 698                 fmd->fimc[fimc->id] = fimc;
 699                 fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
 700         } else {
 701                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
 702                          fimc->id, ret);
 703         }
 704         return ret;
 705 }
 706
 707 static int register_csis_entity(struct fimc_md *fmd,
 708                                 struct platform_device *pdev,
 709                                 struct v4l2_subdev *sd)
 710 {
 711         struct device_node *node = pdev->dev.of_node;
 712         int id, ret;
 713
 714         id = node ? __of_get_csis_id(node) : max(0, pdev->id);
 715
 716         if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
 717                 return -ENOENT;
 718
 719         if (WARN_ON(fmd->csis[id].sd))
 720                 return -EBUSY;
 721
 722         sd->grp_id = GRP_ID_CSIS;
 723         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 724         if (!ret)
 725                 fmd->csis[id].sd = sd;
 726         else
 727                 v4l2_err(&fmd->v4l2_dev,
 728                          "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
 729         return ret;
 730 }
 731
 732 static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
 733 {
 734         struct v4l2_subdev *sd = &is->isp.subdev;
 735         int ret;
 736
 737         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
 738         if (ret) {
 739                 v4l2_err(&fmd->v4l2_dev,
 740                          "Failed to register FIMC-ISP (%d)\n", ret);
 741                 return ret;
 742         }
 743
 744         fmd->fimc_is = is;
 745         return 0;
 746 }
 747
 748 static int fimc_md_register_platform_entity(struct fimc_md *fmd,
 749                                             struct platform_device *pdev,
 750                                             int plat_entity)
 751 {
 752         struct device *dev = &pdev->dev;
 753         int ret = -EPROBE_DEFER;
 754         void *drvdata;
 755
 756         /* Lock to ensure dev->driver won't change. */
 757         device_lock(dev);
 758
 759         if (!dev->driver || !try_module_get(dev->driver->owner))
 760                 goto dev_unlock;
 761
 762         drvdata = dev_get_drvdata(dev);
 763         /* Some subdev didn't probe successfully id drvdata is NULL */
 764         if (drvdata) {
 765                 switch (plat_entity) {
 766                 case IDX_FIMC:
 767                         ret = register_fimc_entity(fmd, drvdata);
 768                         break;
 769                 case IDX_FLITE:
 770                         ret = register_fimc_lite_entity(fmd, drvdata);
 771                         break;
 772                 case IDX_CSIS:
 773                         ret = register_csis_entity(fmd, pdev, drvdata);
 774                         break;
 775                 case IDX_IS_ISP:
 776                         ret = register_fimc_is_entity(fmd, drvdata);
 777                         break;
 778                 default:
 779                         ret = -ENODEV;
 780                 }
 781         }
 782
 783         module_put(dev->driver->owner);
 784 dev_unlock:
 785         device_unlock(dev);
 786         if (ret == -EPROBE_DEFER)
 787                 dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
 788                         dev_name(dev));
 789         else if (ret < 0)
 790                 dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
 791                         dev_name(dev), ret);
 792         return ret;
 793 }
 794
 795 static int fimc_md_pdev_match(struct device *dev, void *data)
 796 {
 797         struct platform_device *pdev = to_platform_device(dev);
 798         int plat_entity = -1;
 799         int ret;
 800         char *p;
 801
 802         if (!get_device(dev))
 803                 return -ENODEV;
 804
 805         if (!strcmp(pdev->name, CSIS_DRIVER_NAME)) {
 806                 plat_entity = IDX_CSIS;
 807         } else {
 808                 p = strstr(pdev->name, "fimc");
 809                 if (p && *(p + 4) == 0)
 810                         plat_entity = IDX_FIMC;
 811         }
 812
 813         if (plat_entity >= 0)
 814                 ret = fimc_md_register_platform_entity(data, pdev,
 815                                                        plat_entity);
 816         put_device(dev);
 817         return 0;
 818 }
 819
 820 /* Register FIMC, FIMC-LITE and CSIS media entities */
 821 #ifdef CONFIG_OF
 822 static int fimc_md_register_of_platform_entities(struct fimc_md *fmd,
 823                                                  struct device_node *parent)
 824 {
 825         struct device_node *node;
 826         int ret = 0;
 827
 828         for_each_available_child_of_node(parent, node) {
 829                 struct platform_device *pdev;
 830                 int plat_entity = -1;
 831
 832                 pdev = of_find_device_by_node(node);
 833                 if (!pdev)
 834                         continue;
 835
 836                 /* If driver of any entity isn't ready try all again later. */
 837                 if (!strcmp(node->name, CSIS_OF_NODE_NAME))
 838                         plat_entity = IDX_CSIS;
 839                 else if (!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
 840                         plat_entity = IDX_IS_ISP;
 841                 else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
 842                         plat_entity = IDX_FLITE;
 843                 else if (!strcmp(node->name, FIMC_OF_NODE_NAME) &&
 844                          !of_property_read_bool(node, "samsung,lcd-wb"))
 845                         plat_entity = IDX_FIMC;
 846
 847                 if (plat_entity >= 0)
 848                         ret = fimc_md_register_platform_entity(fmd, pdev,
 849                                                         plat_entity);
 850                 put_device(&pdev->dev);
 851                 if (ret < 0)
 852                         break;
 853         }
 854
 855         return ret;
 856 }
 857 #else
 858 #define fimc_md_register_of_platform_entities(fmd, node) (-ENOSYS)
 859 #endif
 860
 861 static void fimc_md_unregister_entities(struct fimc_md *fmd)
 862 {
 863         int i;
 864
 865         for (i = 0; i < FIMC_MAX_DEVS; i++) {
 866                 struct fimc_dev *dev = fmd->fimc[i];
 867                 if (dev == NULL)
 868                         continue;
 869                 v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
 870                 dev->vid_cap.ve.pipe = NULL;
 871                 fmd->fimc[i] = NULL;
 872         }
 873         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 874                 struct fimc_lite *dev = fmd->fimc_lite[i];
 875                 if (dev == NULL)
 876                         continue;
 877                 v4l2_device_unregister_subdev(&dev->subdev);
 878                 dev->ve.pipe = NULL;
 879                 fmd->fimc_lite[i] = NULL;
 880         }
 881         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
 882                 if (fmd->csis[i].sd == NULL)
 883                         continue;
 884                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
 885                 fmd->csis[i].sd = NULL;
 886         }
 887         for (i = 0; i < fmd->num_sensors; i++) {
 888                 if (fmd->sensor[i].subdev == NULL)
 889                         continue;
 890                 fimc_md_unregister_sensor(fmd->sensor[i].subdev);
 891                 fmd->sensor[i].subdev = NULL;
 892         }
 893
 894         if (fmd->fimc_is)
 895                 v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);
 896
 897         v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
 898 }
 899
 900 /**
 901  * __fimc_md_create_fimc_links - create links to all FIMC entities
 902  * @fmd: fimc media device
 903  * @source: the source entity to create links to all fimc entities from
 904  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 905  * @pad: the source entity pad index
 906  * @link_mask: bitmask of the fimc devices for which link should be enabled
 907  */
 908 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
 909                                             struct media_entity *source,
 910                                             struct v4l2_subdev *sensor,
 911                                             int pad, int link_mask)
 912 {
 913         struct fimc_source_info *si = NULL;
 914         struct media_entity *sink;
 915         unsigned int flags = 0;
 916         int i, ret = 0;
 917
 918         if (sensor) {
 919                 si = v4l2_get_subdev_hostdata(sensor);
 920                 /* Skip direct FIMC links in the logical FIMC-IS sensor path */
 921                 if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
 922                         ret = 1;
 923         }
 924
 925         for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
 926                 if (!fmd->fimc[i])
 927                         continue;
 928                 /*
 929                  * Some FIMC variants are not fitted with camera capture
 930                  * interface. Skip creating a link from sensor for those.
 931                  */
 932                 if (!fmd->fimc[i]->variant->has_cam_if)
 933                         continue;
 934
 935                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
 936
 937                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
 938                 ret = media_entity_create_link(source, pad, sink,
 939                                               FIMC_SD_PAD_SINK_CAM, flags);
 940                 if (ret)
 941                         return ret;
 942
 943                 /* Notify FIMC capture subdev entity */
 944                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 945                                         &source->pads[pad], flags);
 946                 if (ret)
 947                         break;
 948
 949                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
 950                           source->name, flags ? '=' : '-', sink->name);
 951         }
 952
 953         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 954                 if (!fmd->fimc_lite[i])
 955                         continue;
 956
 957                 sink = &fmd->fimc_lite[i]->subdev.entity;
 958                 ret = media_entity_create_link(source, pad, sink,
 959                                                FLITE_SD_PAD_SINK, 0);
 960                 if (ret)
 961                         return ret;
 962
 963                 /* Notify FIMC-LITE subdev entity */
 964                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
 965                                         &source->pads[pad], 0);
 966                 if (ret)
 967                         break;
 968
 969                 v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
 970                           source->name, sink->name);
 971         }
 972         return 0;
 973 }
 974
 975 /* Create links from FIMC-LITE source pads to other entities */
 976 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
 977 {
 978         struct media_entity *source, *sink;
 979         int i, ret = 0;
 980
 981         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
 982                 struct fimc_lite *fimc = fmd->fimc_lite[i];
 983
 984                 if (fimc == NULL)
 985                         continue;
 986
 987                 source = &fimc->subdev.entity;
 988                 sink = &fimc->ve.vdev.entity;
 989                 /* FIMC-LITE's subdev and video node */
 990                 ret = media_entity_create_link(source, FLITE_SD_PAD_SOURCE_DMA,
 991                                                sink, 0, 0);
 992                 if (ret)
 993                         break;
 994                 /* Link from FIMC-LITE to IS-ISP subdev */
 995                 sink = &fmd->fimc_is->isp.subdev.entity;
 996                 ret = media_entity_create_link(source, FLITE_SD_PAD_SOURCE_ISP,
 997                                                sink, 0, 0);
 998                 if (ret)
 999                         break;
1000         }
1001
1002         return ret;
1003 }
1004
1005 /* Create FIMC-IS links */
1006 static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
1007 {
1008         struct media_entity *source, *sink;
1009         int i, ret;
1010
1011         source = &fmd->fimc_is->isp.subdev.entity;
1012
1013         for (i = 0; i < FIMC_MAX_DEVS; i++) {
1014                 if (fmd->fimc[i] == NULL)
1015                         continue;
1016
1017                 /* Link from IS-ISP subdev to FIMC */
1018                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
1019                 ret = media_entity_create_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
1020                                                sink, FIMC_SD_PAD_SINK_FIFO, 0);
1021                 if (ret)
1022                         return ret;
1023         }
1024
1025         return ret;
1026 }
1027
1028 /**
1029  * fimc_md_create_links - create default links between registered entities
1030  *
1031  * Parallel interface sensor entities are connected directly to FIMC capture
1032  * entities. The sensors using MIPI CSIS bus are connected through immutable
1033  * link with CSI receiver entity specified by mux_id. Any registered CSIS
1034  * entity has a link to each registered FIMC capture entity. Enabled links
1035  * are created by default between each subsequent registered sensor and
1036  * subsequent FIMC capture entity. The number of default active links is
1037  * determined by the number of available sensors or FIMC entities,
1038  * whichever is less.
1039  */
1040 static int fimc_md_create_links(struct fimc_md *fmd)
1041 {
1042         struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
1043         struct v4l2_subdev *sensor, *csis;
1044         struct fimc_source_info *pdata;
1045         struct media_entity *source, *sink;
1046         int i, pad, fimc_id = 0, ret = 0;
1047         u32 flags, link_mask = 0;
1048
1049         for (i = 0; i < fmd->num_sensors; i++) {
1050                 if (fmd->sensor[i].subdev == NULL)
1051                         continue;
1052
1053                 sensor = fmd->sensor[i].subdev;
1054                 pdata = v4l2_get_subdev_hostdata(sensor);
1055                 if (!pdata)
1056                         continue;
1057
1058                 source = NULL;
1059
1060                 switch (pdata->sensor_bus_type) {
1061                 case FIMC_BUS_TYPE_MIPI_CSI2:
1062                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
1063                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
1064                                 return -EINVAL;
1065
1066                         csis = fmd->csis[pdata->mux_id].sd;
1067                         if (WARN(csis == NULL,
1068                                  "MIPI-CSI interface specified "
1069                                  "but s5p-csis module is not loaded!\n"))
1070                                 return -EINVAL;
1071
1072                         pad = sensor->entity.num_pads - 1;
1073                         ret = media_entity_create_link(&sensor->entity, pad,
1074                                               &csis->entity, CSIS_PAD_SINK,
1075                                               MEDIA_LNK_FL_IMMUTABLE |
1076                                               MEDIA_LNK_FL_ENABLED);
1077                         if (ret)
1078                                 return ret;
1079
1080                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
1081                                   sensor->entity.name, csis->entity.name);
1082
1083                         source = NULL;
1084                         csi_sensors[pdata->mux_id] = sensor;
1085                         break;
1086
1087                 case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
1088                         source = &sensor->entity;
1089                         pad = 0;
1090                         break;
1091
1092                 default:
1093                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
1094                                  pdata->sensor_bus_type);
1095                         return -EINVAL;
1096                 }
1097                 if (source == NULL)
1098                         continue;
1099
1100                 link_mask = 1 << fimc_id++;
1101                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
1102                                                        pad, link_mask);
1103         }
1104
1105         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
1106                 if (fmd->csis[i].sd == NULL)
1107                         continue;
1108
1109                 source = &fmd->csis[i].sd->entity;
1110                 pad = CSIS_PAD_SOURCE;
1111                 sensor = csi_sensors[i];
1112
1113                 link_mask = 1 << fimc_id++;
1114                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
1115                                                        pad, link_mask);
1116         }
1117
1118         /* Create immutable links between each FIMC's subdev and video node */
1119         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
1120         for (i = 0; i < FIMC_MAX_DEVS; i++) {
1121                 if (!fmd->fimc[i])
1122                         continue;
1123
1124                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
1125                 sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;
1126
1127                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
1128                                               sink, 0, flags);
1129                 if (ret)
1130                         break;
1131         }
1132
1133         ret = __fimc_md_create_flite_source_links(fmd);
1134         if (ret < 0)
1135                 return ret;
1136
1137         if (fmd->use_isp)
1138                 ret = __fimc_md_create_fimc_is_links(fmd);
1139
1140         return ret;
1141 }
1142
1143 /*
1144  * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
1145  */
1146 static void fimc_md_put_clocks(struct fimc_md *fmd)
1147 {
1148         int i = FIMC_MAX_CAMCLKS;
1149
1150         while (--i >= 0) {
1151                 if (IS_ERR(fmd->camclk[i].clock))
1152                         continue;
1153                 clk_put(fmd->camclk[i].clock);
1154                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1155         }
1156
1157         /* Writeback (PIXELASYNCMx) clocks */
1158         for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
1159                 if (IS_ERR(fmd->wbclk[i]))
1160                         continue;
1161                 clk_put(fmd->wbclk[i]);
1162                 fmd->wbclk[i] = ERR_PTR(-EINVAL);
1163         }
1164 }
1165
1166 static int fimc_md_get_clocks(struct fimc_md *fmd)
1167 {
1168         struct device *dev = NULL;
1169         char clk_name[32];
1170         struct clk *clock;
1171         int i, ret = 0;
1172
1173         for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
1174                 fmd->camclk[i].clock = ERR_PTR(-EINVAL);
1175
1176         if (fmd->pdev->dev.of_node)
1177                 dev = &fmd->pdev->dev;
1178
1179         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
1180                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
1181                 clock = clk_get(dev, clk_name);
1182
1183                 if (IS_ERR(clock)) {
1184                         dev_err(&fmd->pdev->dev, "Failed to get clock: %s\n",
1185                                                                 clk_name);
1186                         ret = PTR_ERR(clock);
1187                         break;
1188                 }
1189                 fmd->camclk[i].clock = clock;
1190         }
1191         if (ret)
1192                 fimc_md_put_clocks(fmd);
1193
1194         if (!fmd->use_isp)
1195                 return 0;
1196         /*
1197          * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
1198          * leave PIXELASYNCM0 out for the LCD Writeback driver.
1199          */
1200         fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);
1201
1202         for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
1203                 snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
1204                 clock = clk_get(dev, clk_name);
1205                 if (IS_ERR(clock)) {
1206                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
1207                                   clk_name);
1208                         ret = PTR_ERR(clock);
1209                         break;
1210                 }
1211                 fmd->wbclk[i] = clock;
1212         }
1213         if (ret)
1214                 fimc_md_put_clocks(fmd);
1215
1216         return ret;
1217 }
1218
1219 static int __fimc_md_set_camclk(struct fimc_md *fmd,
1220                                 struct fimc_source_info *si,
1221                                 bool on)
1222 {
1223         struct fimc_camclk_info *camclk;
1224         int ret = 0;
1225
1226         if (WARN_ON(si->clk_id >= FIMC_MAX_CAMCLKS) || !fmd || !fmd->pmf)
1227                 return -EINVAL;
1228
1229         camclk = &fmd->camclk[si->clk_id];
1230
1231         dbg("camclk %d, f: %lu, use_count: %d, on: %d",
1232             si->clk_id, si->clk_frequency, camclk->use_count, on);
1233
1234         if (on) {
1235                 if (camclk->use_count > 0 &&
1236                     camclk->frequency != si->clk_frequency)
1237                         return -EINVAL;
1238
1239                 if (camclk->use_count++ == 0) {
1240                         clk_set_rate(camclk->clock, si->clk_frequency);
1241                         camclk->frequency = si->clk_frequency;
1242                         ret = pm_runtime_get_sync(fmd->pmf);
1243                         if (ret < 0)
1244                                 return ret;
1245                         ret = clk_prepare_enable(camclk->clock);
1246                         dbg("Enabled camclk %d: f: %lu", si->clk_id,
1247                             clk_get_rate(camclk->clock));
1248                 }
1249                 return ret;
1250         }
1251
1252         if (WARN_ON(camclk->use_count == 0))
1253                 return 0;
1254
1255         if (--camclk->use_count == 0) {
1256                 clk_disable_unprepare(camclk->clock);
1257                 pm_runtime_put(fmd->pmf);
1258                 dbg("Disabled camclk %d", si->clk_id);
1259         }
1260         return ret;
1261 }
1262
1263 /**
1264  * fimc_md_set_camclk - peripheral sensor clock setup
1265  * @sd: sensor subdev to configure sclk_cam clock for
1266  * @on: 1 to enable or 0 to disable the clock
1267  *
1268  * There are 2 separate clock outputs available in the SoC for external
1269  * image processors. These clocks are shared between all registered FIMC
1270  * devices to which sensors can be attached, either directly or through
1271  * the MIPI CSI receiver. The clock is allowed here to be used by
1272  * multiple sensors concurrently if they use same frequency.
1273  * This function should only be called when the graph mutex is held.
1274  */
1275 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
1276 {
1277         struct fimc_source_info *si = v4l2_get_subdev_hostdata(sd);
1278         struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
1279
1280         return __fimc_md_set_camclk(fmd, si, on);
1281 }
1282
1283 static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
1284 {
1285         struct exynos_video_entity *ve;
1286         struct fimc_pipeline *p;
1287         struct video_device *vdev;
1288         int ret;
1289
1290         vdev = media_entity_to_video_device(entity);
1291         if (vdev->entity.use_count == 0)
1292                 return 0;
1293
1294         ve = vdev_to_exynos_video_entity(vdev);
1295         p = to_fimc_pipeline(ve->pipe);
1296         /*
1297          * Nothing to do if we are disabling the pipeline, some link
1298          * has been disconnected and p->subdevs array is cleared now.
1299          */
1300         if (!enable && p->subdevs[IDX_SENSOR] == NULL)
1301                 return 0;
1302
1303         if (enable)
1304                 ret = __fimc_pipeline_open(ve->pipe, entity, true);
1305         else
1306                 ret = __fimc_pipeline_close(ve->pipe);
1307
1308         if (ret == 0 && !enable)
1309                 memset(p->subdevs, 0, sizeof(p->subdevs));
1310
1311         return ret;
1312 }
1313
1314 /* Locking: called with entity->parent->graph_mutex mutex held. */
1315 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable)
1316 {
1317         struct media_entity *entity_err = entity;
1318         struct media_entity_graph graph;
1319         int ret;
1320
1321         /*
1322          * Walk current graph and call the pipeline open/close routine for each
1323          * opened video node that belongs to the graph of entities connected
1324          * through active links. This is needed as we cannot power on/off the
1325          * subdevs in random order.
1326          */
1327         media_entity_graph_walk_start(&graph, entity);
1328
1329         while ((entity = media_entity_graph_walk_next(&graph))) {
1330                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
1331                         continue;
1332
1333                 ret  = __fimc_md_modify_pipeline(entity, enable);
1334
1335                 if (ret < 0)
1336                         goto err;
1337         }
1338
1339         return 0;
1340  err:
1341         media_entity_graph_walk_start(&graph, entity_err);
1342
1343         while ((entity_err = media_entity_graph_walk_next(&graph))) {
1344                 if (media_entity_type(entity_err) != MEDIA_ENT_T_DEVNODE)
1345                         continue;
1346
1347                 __fimc_md_modify_pipeline(entity_err, !enable);
1348
1349                 if (entity_err == entity)
1350                         break;
1351         }
1352
1353         return ret;
1354 }
1355
1356 static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
1357                                 unsigned int notification)
1358 {
1359         struct media_entity *sink = link->sink->entity;
1360         int ret = 0;
1361
1362         /* Before link disconnection */
1363         if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
1364                 if (!(flags & MEDIA_LNK_FL_ENABLED))
1365                         ret = __fimc_md_modify_pipelines(sink, false);
1366                 else
1367                         ; /* TODO: Link state change validation */
1368         /* After link activation */
1369         } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
1370                    (link->flags & MEDIA_LNK_FL_ENABLED)) {
1371                 ret = __fimc_md_modify_pipelines(sink, true);
1372         }
1373
1374         return ret ? -EPIPE : 0;
1375 }
1376
1377 static ssize_t fimc_md_sysfs_show(struct device *dev,
1378                                   struct device_attribute *attr, char *buf)
1379 {
1380         struct platform_device *pdev = to_platform_device(dev);
1381         struct fimc_md *fmd = platform_get_drvdata(pdev);
1382
1383         if (fmd->user_subdev_api)
1384                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
1385
1386         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
1387 }
1388
1389 static ssize_t fimc_md_sysfs_store(struct device *dev,
1390                                    struct device_attribute *attr,
1391                                    const char *buf, size_t count)
1392 {
1393         struct platform_device *pdev = to_platform_device(dev);
1394         struct fimc_md *fmd = platform_get_drvdata(pdev);
1395         bool subdev_api;
1396         int i;
1397
1398         if (!strcmp(buf, "vid-dev\n"))
1399                 subdev_api = false;
1400         else if (!strcmp(buf, "sub-dev\n"))
1401                 subdev_api = true;
1402         else
1403                 return count;
1404
1405         fmd->user_subdev_api = subdev_api;
1406         for (i = 0; i < FIMC_MAX_DEVS; i++)
1407                 if (fmd->fimc[i])
1408                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
1409         return count;
1410 }
1411 /*
1412  * This device attribute is to select video pipeline configuration method.
1413  * There are following valid values:
1414  *  vid-dev - for V4L2 video node API only, subdevice will be configured
1415  *  by the host driver.
1416  *  sub-dev - for media controller API, subdevs must be configured in user
1417  *  space before starting streaming.
1418  */
1419 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
1420                    fimc_md_sysfs_show, fimc_md_sysfs_store);
1421
1422 static int fimc_md_get_pinctrl(struct fimc_md *fmd)
1423 {
1424         struct device *dev = &fmd->pdev->dev;
1425         struct fimc_pinctrl *pctl = &fmd->pinctl;
1426
1427         pctl->pinctrl = devm_pinctrl_get(dev);
1428         if (IS_ERR(pctl->pinctrl))
1429                 return PTR_ERR(pctl->pinctrl);
1430
1431         pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
1432                                         PINCTRL_STATE_DEFAULT);
1433         if (IS_ERR(pctl->state_default))
1434                 return PTR_ERR(pctl->state_default);
1435
1436         pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
1437                                         PINCTRL_STATE_IDLE);
1438         return 0;
1439 }
1440
1441 static int fimc_md_probe(struct platform_device *pdev)
1442 {
1443         struct device *dev = &pdev->dev;
1444         struct v4l2_device *v4l2_dev;
1445         struct fimc_md *fmd;
1446         int ret;
1447
1448         fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
1449         if (!fmd)
1450                 return -ENOMEM;
1451
1452         spin_lock_init(&fmd->slock);
1453         fmd->pdev = pdev;
1454         INIT_LIST_HEAD(&fmd->pipelines);
1455
1456         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
1457                 sizeof(fmd->media_dev.model));
1458         fmd->media_dev.link_notify = fimc_md_link_notify;
1459         fmd->media_dev.dev = dev;
1460
1461         v4l2_dev = &fmd->v4l2_dev;
1462         v4l2_dev->mdev = &fmd->media_dev;
1463         v4l2_dev->notify = fimc_sensor_notify;
1464         strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));
1465
1466         fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
1467
1468         ret = v4l2_device_register(dev, &fmd->v4l2_dev);
1469         if (ret < 0) {
1470                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
1471                 return ret;
1472         }
1473         ret = media_device_register(&fmd->media_dev);
1474         if (ret < 0) {
1475                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
1476                 goto err_md;
1477         }
1478         ret = fimc_md_get_clocks(fmd);
1479         if (ret)
1480                 goto err_clk;
1481
1482         fmd->user_subdev_api = (dev->of_node != NULL);
1483
1484         /* Protect the media graph while we're registering entities */
1485         mutex_lock(&fmd->media_dev.graph_mutex);
1486
1487         ret = fimc_md_get_pinctrl(fmd);
1488         if (ret < 0) {
1489                 if (ret != EPROBE_DEFER)
1490                         dev_err(dev, "Failed to get pinctrl: %d\n", ret);
1491                 goto err_unlock;
1492         }
1493
1494         if (dev->of_node)
1495                 ret = fimc_md_register_of_platform_entities(fmd, dev->of_node);
1496         else
1497                 ret = bus_for_each_dev(&platform_bus_type, NULL, fmd,
1498                                                 fimc_md_pdev_match);
1499         if (ret)
1500                 goto err_unlock;
1501
1502         if (dev->platform_data || dev->of_node) {
1503                 ret = fimc_md_register_sensor_entities(fmd);
1504                 if (ret)
1505                         goto err_unlock;
1506         }
1507
1508         ret = fimc_md_create_links(fmd);
1509         if (ret)
1510                 goto err_unlock;
1511         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
1512         if (ret)
1513                 goto err_unlock;
1514
1515         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1516         if (ret)
1517                 goto err_unlock;
1518
1519         platform_set_drvdata(pdev, fmd);
1520         mutex_unlock(&fmd->media_dev.graph_mutex);
1521         return 0;
1522
1523 err_unlock:
1524         mutex_unlock(&fmd->media_dev.graph_mutex);
1525 err_clk:
1526         fimc_md_put_clocks(fmd);
1527         fimc_md_unregister_entities(fmd);
1528         media_device_unregister(&fmd->media_dev);
1529 err_md:
1530         v4l2_device_unregister(&fmd->v4l2_dev);
1531         return ret;
1532 }
1533
1534 static int fimc_md_remove(struct platform_device *pdev)
1535 {
1536         struct fimc_md *fmd = platform_get_drvdata(pdev);
1537
1538         if (!fmd)
1539                 return 0;
1540
1541         v4l2_device_unregister(&fmd->v4l2_dev);
1542         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1543         fimc_md_unregister_entities(fmd);
1544         fimc_md_pipelines_free(fmd);
1545         media_device_unregister(&fmd->media_dev);
1546         fimc_md_put_clocks(fmd);
1547         return 0;
1548 }
1549
1550 static struct platform_device_id fimc_driver_ids[] __always_unused = {
1551         { .name = "s5p-fimc-md" },
1552         { },
1553 };
1554 MODULE_DEVICE_TABLE(platform, fimc_driver_ids);
1555
1556 static const struct of_device_id fimc_md_of_match[] = {
1557         { .compatible = "samsung,fimc" },
1558         { },
1559 };
1560 MODULE_DEVICE_TABLE(of, fimc_md_of_match);
1561
1562 static struct platform_driver fimc_md_driver = {
1563         .probe          = fimc_md_probe,
1564         .remove         = fimc_md_remove,
1565         .driver = {
1566                 .of_match_table = of_match_ptr(fimc_md_of_match),
1567                 .name           = "s5p-fimc-md",
1568                 .owner          = THIS_MODULE,
1569         }
1570 };
1571
1572 static int __init fimc_md_init(void)
1573 {
1574         int ret;
1575
1576         request_module("s5p-csis");
1577         ret = fimc_register_driver();
1578         if (ret)
1579                 return ret;
1580
1581         return platform_driver_register(&fimc_md_driver);
1582 }
1583
1584 static void __exit fimc_md_exit(void)
1585 {
1586         platform_driver_unregister(&fimc_md_driver);
1587         fimc_unregister_driver();
1588 }
1589
1590 module_init(fimc_md_init);
1591 module_exit(fimc_md_exit);
1592
1593 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1594 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1595 MODULE_LICENSE("GPL");
1596 MODULE_VERSION("2.0.1");