drivers/staging/greybus/camera.c

   1 /*
   2  * Greybus Camera protocol driver.
   3  *
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #include <linux/debugfs.h>
  11 #include <linux/fs.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/string.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/vmalloc.h>
  18
  19 #include "gb-camera.h"
  20 #include "greybus.h"
  21 #include "greybus_protocols.h"
  22
  23 enum gb_camera_debugs_buffer_id {
  24         GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES,
  25         GB_CAMERA_DEBUGFS_BUFFER_STREAMS,
  26         GB_CAMERA_DEBUGFS_BUFFER_CAPTURE,
  27         GB_CAMERA_DEBUGFS_BUFFER_FLUSH,
  28         GB_CAMERA_DEBUGFS_BUFFER_MAX,
  29 };
  30
  31 struct gb_camera_debugfs_buffer {
  32         char data[PAGE_SIZE];
  33         size_t length;
  34 };
  35
  36 /**
  37  * struct gb_camera - A Greybus Camera Device
  38  * @connection: the greybus connection for camera control
  39  * @data_connected: whether the data connection has been established
  40  * @debugfs: debugfs entries for camera protocol operations testing
  41  */
  42 struct gb_camera {
  43         struct gb_connection *connection;
  44         bool data_connected;
  45
  46         struct {
  47                 struct dentry *root;
  48                 struct gb_camera_debugfs_buffer *buffers;
  49         } debugfs;
  50 };
  51
  52 struct gb_camera_stream_config {
  53         unsigned int width;
  54         unsigned int height;
  55         unsigned int format;
  56         unsigned int vc;
  57         unsigned int dt[2];
  58         unsigned int max_size;
  59 };
  60
  61 struct gb_camera_fmt_map {
  62         enum v4l2_mbus_pixelcode mbus_code;
  63         unsigned int gb_format;
  64 };
  65
  66 /* GB format to media code map */
  67 static const struct gb_camera_fmt_map mbus_to_gbus_format[] = {
  68         {
  69                 .mbus_code = V4L2_MBUS_FMT_UYVY8_1X16,
  70                 .gb_format = 0x01,
  71         },
  72         {
  73                 .mbus_code = V4L2_MBUS_FMT_NV12_1x8,
  74                 .gb_format = 0x12,
  75         },
  76         {
  77                 .mbus_code = V4L2_MBUS_FMT_NV21_1x8,
  78                 .gb_format = 0x13,
  79         },
  80         {
  81                 .mbus_code = V4L2_MBUS_FMT_YU12_1x8,
  82                 .gb_format = 0x16,
  83         },
  84         {
  85                 .mbus_code = V4L2_MBUS_FMT_YV12_1x8,
  86                 .gb_format = 0x17,
  87         },
  88         {
  89                 .mbus_code = V4L2_MBUS_FMT_JPEG_1X8,
  90                 .gb_format = 0x40,
  91         }
  92 };
  93
  94 #define ES2_APB_CDSI0_CPORT             16
  95 #define ES2_APB_CDSI1_CPORT             17
  96
  97 #define GB_CAMERA_MAX_SETTINGS_SIZE     8192
  98
  99 #define gcam_dbg(gcam, format...) \
 100         dev_dbg(&gcam->connection->bundle->dev, format)
 101 #define gcam_info(gcam, format...) \
 102         dev_info(&gcam->connection->bundle->dev, format)
 103 #define gcam_err(gcam, format...) \
 104         dev_err(&gcam->connection->bundle->dev, format)
 105
 106 /* -----------------------------------------------------------------------------
 107  * Camera Protocol Operations
 108  */
 109
 110 struct ap_csi_config_request {
 111         __u8 csi_id;
 112         __u8 clock_mode;
 113         __u8 num_lanes;
 114         __u8 padding;
 115         __le32 bus_freq;
 116 } __packed;
 117
 118 static int gb_camera_configure_streams(struct gb_camera *gcam,
 119                                        unsigned int *num_streams,
 120                                        unsigned int *flags,
 121                                        struct gb_camera_stream_config *streams)
 122 {
 123         struct gb_interface *intf = gcam->connection->intf;
 124         struct gb_svc *svc = gcam->connection->hd->svc;
 125         struct gb_camera_configure_streams_request *req;
 126         struct gb_camera_configure_streams_response *resp;
 127         struct ap_csi_config_request csi_cfg;
 128
 129         unsigned int nstreams = *num_streams;
 130         unsigned int i;
 131         size_t req_size;
 132         size_t resp_size;
 133         int ret;
 134
 135         if (nstreams > GB_CAMERA_MAX_STREAMS)
 136                 return -EINVAL;
 137
 138         req_size = sizeof(*req) + nstreams * sizeof(req->config[0]);
 139         resp_size = sizeof(*resp) + nstreams * sizeof(resp->config[0]);
 140
 141         req = kmalloc(req_size, GFP_KERNEL);
 142         resp = kmalloc(resp_size, GFP_KERNEL);
 143         if (!req || !resp) {
 144                 ret = -ENOMEM;
 145                 goto done;
 146         }
 147
 148         /*
 149          * Setup unipro link speed before actually issuing configuration
 150          * to the camera module, to assure unipro network speed is set
 151          * before CSI interfaces gets configured
 152          */
 153         if (nstreams && !(*flags & GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY)) {
 154                 ret = gb_svc_intf_set_power_mode(svc, intf->interface_id,
 155                                                  GB_SVC_UNIPRO_HS_SERIES_A,
 156                                                  GB_SVC_UNIPRO_FAST_MODE, 2, 2,
 157                                                  GB_SVC_UNIPRO_FAST_MODE, 2, 2,
 158                                                  GB_SVC_PWRM_RXTERMINATION |
 159                                                  GB_SVC_PWRM_TXTERMINATION, 0);
 160                 if (ret < 0)
 161                         goto done;
 162
 163                 ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 164                                                  GB_SVC_UNIPRO_HS_SERIES_A,
 165                                                  GB_SVC_UNIPRO_FAST_MODE, 2, 2,
 166                                                  GB_SVC_UNIPRO_FAST_MODE, 2, 2,
 167                                                  GB_SVC_PWRM_RXTERMINATION |
 168                                                  GB_SVC_PWRM_TXTERMINATION, 0);
 169                 if (ret < 0)
 170                         goto done;
 171         } else if (nstreams == 0) {
 172                 ret = gb_svc_intf_set_power_mode(svc, intf->interface_id,
 173                                                  GB_SVC_UNIPRO_HS_SERIES_A,
 174                                                  GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 175                                                  1, 2,
 176                                                  GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 177                                                  1, 2,
 178                                                  0, 0);
 179                 if (ret < 0) {
 180                         gcam_err(gcam, "can't take camera link to PWM-G1 auto: %d\n",
 181                                  ret);
 182                         goto done;
 183                 }
 184
 185                 ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 186                                                  GB_SVC_UNIPRO_HS_SERIES_A,
 187                                                  GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 188                                                  1, 2,
 189                                                  GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 190                                                  1, 2,
 191                                                  0, 0);
 192                 if (ret < 0) {
 193                         gcam_err(gcam, "can't take AP link to PWM-G1 auto: %d\n",
 194                                  ret);
 195                         goto done;
 196                 }
 197         }
 198
 199         req->num_streams = nstreams;
 200         req->flags = *flags;
 201         req->padding = 0;
 202
 203         for (i = 0; i < nstreams; ++i) {
 204                 struct gb_camera_stream_config_request *cfg = &req->config[i];
 205
 206                 cfg->width = cpu_to_le16(streams[i].width);
 207                 cfg->height = cpu_to_le16(streams[i].height);
 208                 cfg->format = cpu_to_le16(streams[i].format);
 209                 cfg->padding = 0;
 210         }
 211
 212         ret = gb_operation_sync(gcam->connection,
 213                                 GB_CAMERA_TYPE_CONFIGURE_STREAMS,
 214                                 req, req_size, resp, resp_size);
 215         if (ret < 0)
 216                 goto set_unipro_slow_mode;
 217
 218         if (resp->num_streams > nstreams) {
 219                 gcam_dbg(gcam, "got #streams %u > request %u\n",
 220                          resp->num_streams, nstreams);
 221                 ret = -EIO;
 222                 goto set_unipro_slow_mode;
 223         }
 224
 225         if (resp->padding != 0) {
 226                 gcam_dbg(gcam, "response padding != 0");
 227                 ret = -EIO;
 228                 goto set_unipro_slow_mode;
 229         }
 230
 231         for (i = 0; i < nstreams; ++i) {
 232                 struct gb_camera_stream_config_response *cfg = &resp->config[i];
 233
 234                 streams[i].width = le16_to_cpu(cfg->width);
 235                 streams[i].height = le16_to_cpu(cfg->height);
 236                 streams[i].format = le16_to_cpu(cfg->format);
 237                 streams[i].vc = cfg->virtual_channel;
 238                 streams[i].dt[0] = cfg->data_type[0];
 239                 streams[i].dt[1] = cfg->data_type[1];
 240                 streams[i].max_size = le32_to_cpu(cfg->max_size);
 241
 242                 if (cfg->padding[0] || cfg->padding[1] || cfg->padding[2]) {
 243                         gcam_dbg(gcam, "stream #%u padding != 0", i);
 244                         ret = -EIO;
 245                         goto set_unipro_slow_mode;
 246                 }
 247         }
 248
 249         if (nstreams && resp->flags & GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED) {
 250                 *flags = resp->flags;
 251                 *num_streams = resp->num_streams;
 252                 goto set_unipro_slow_mode;
 253         }
 254
 255         memset(&csi_cfg, 0, sizeof(csi_cfg));
 256
 257         /* Configure the CSI transmitter. Hardcode the parameters for now. */
 258         if (nstreams) {
 259                 csi_cfg.csi_id = 1;
 260                 csi_cfg.clock_mode = 0;
 261                 csi_cfg.num_lanes = 4;
 262                 csi_cfg.bus_freq = cpu_to_le32(960000000);
 263                 ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
 264                                    sizeof(csi_cfg),
 265                                    GB_APB_REQUEST_CSI_TX_CONTROL, false);
 266         } else {
 267                 csi_cfg.csi_id = 1;
 268                 ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
 269                                    sizeof(csi_cfg),
 270                                    GB_APB_REQUEST_CSI_TX_CONTROL, false);
 271         }
 272
 273         if (ret < 0)
 274                 gcam_err(gcam, "failed to %s the CSI transmitter\n",
 275                          nstreams ? "start" : "stop");
 276
 277         *flags = resp->flags;
 278         *num_streams = resp->num_streams;
 279         ret = 0;
 280
 281         kfree(req);
 282         kfree(resp);
 283         return ret;
 284
 285 set_unipro_slow_mode:
 286         ret = gb_svc_intf_set_power_mode(svc, intf->interface_id,
 287                                          GB_SVC_UNIPRO_HS_SERIES_A,
 288                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 289                                          1, 2,
 290                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 291                                          1, 2,
 292                                          0, 0);
 293         if (ret < 0) {
 294                 gcam_err(gcam, "can't take camera link to PWM-G1 auto: %d\n",
 295                          ret);
 296                 goto done;
 297         }
 298
 299         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 300                                    GB_SVC_UNIPRO_HS_SERIES_A,
 301                                    GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 302                                    1, 2,
 303                                    GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 304                                    1, 2,
 305                                    0, 0);
 306         if (ret < 0)
 307                 gcam_err(gcam, "can't take AP link to PWM-G1 auto: %d\n",
 308                          ret);
 309
 310 done:
 311         kfree(req);
 312         kfree(resp);
 313         return ret;
 314 }
 315
 316 static int gb_camera_capture(struct gb_camera *gcam, u32 request_id,
 317                              unsigned int streams, unsigned int num_frames,
 318                              size_t settings_size, const void *settings)
 319 {
 320         struct gb_camera_capture_request *req;
 321         size_t req_size;
 322         int ret;
 323
 324         if (settings_size > GB_CAMERA_MAX_SETTINGS_SIZE)
 325                 return -EINVAL;
 326
 327         req_size = sizeof(*req) + settings_size;
 328         req = kmalloc(req_size, GFP_KERNEL);
 329         if (!req)
 330                 return -ENOMEM;
 331
 332         req->request_id = cpu_to_le32(request_id);
 333         req->streams = streams;
 334         req->padding = 0;
 335         req->num_frames = cpu_to_le16(num_frames);
 336         memcpy(req->settings, settings, settings_size);
 337
 338         ret = gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_CAPTURE,
 339                                  req, req_size, NULL, 0);
 340
 341         kfree(req);
 342
 343         return ret;
 344 }
 345
 346 static int gb_camera_flush(struct gb_camera *gcam, u32 *request_id)
 347 {
 348         struct gb_camera_flush_response resp;
 349         int ret;
 350
 351         ret = gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_FLUSH, NULL, 0,
 352                                 &resp, sizeof(resp));
 353         if (ret < 0)
 354                 return ret;
 355
 356         if (request_id)
 357                 *request_id = le32_to_cpu(resp.request_id);
 358
 359         return 0;
 360 }
 361
 362 static int gb_camera_event_recv(u8 type, struct gb_operation *op)
 363 {
 364         struct gb_camera *gcam = op->connection->private;
 365         struct gb_camera_metadata_request *payload;
 366         struct gb_message *request;
 367
 368         if (type != GB_CAMERA_TYPE_METADATA) {
 369                 gcam_err(gcam, "Unsupported unsolicited event: %u\n", type);
 370                 return -EINVAL;
 371         }
 372
 373         request = op->request;
 374
 375         if (request->payload_size < sizeof(*payload)) {
 376                 gcam_err(gcam, "Wrong event size received (%zu < %zu)\n",
 377                          request->payload_size, sizeof(*payload));
 378                 return -EINVAL;
 379         }
 380
 381         payload = request->payload;
 382
 383         gcam_dbg(gcam, "received metadata for request %u, frame %u, stream %u\n",
 384                  payload->request_id, payload->frame_number, payload->stream);
 385
 386         return 0;
 387 }
 388
 389 /* -----------------------------------------------------------------------------
 390  * Interface with HOST ara camera.
 391  */
 392 static unsigned int gb_camera_mbus_to_gb(enum v4l2_mbus_pixelcode mbus_code)
 393 {
 394         unsigned int i;
 395
 396         for (i = 0; i < ARRAY_SIZE(mbus_to_gbus_format); i++) {
 397                 if (mbus_to_gbus_format[i].mbus_code == mbus_code)
 398                         return mbus_to_gbus_format[i].gb_format;
 399         }
 400         return mbus_to_gbus_format[0].gb_format;
 401 }
 402
 403 static enum v4l2_mbus_pixelcode gb_camera_gb_to_mbus(u16 gb_fmt)
 404 {
 405         unsigned int i;
 406
 407         for (i = 0; i < ARRAY_SIZE(mbus_to_gbus_format); i++) {
 408                 if (mbus_to_gbus_format[i].gb_format == gb_fmt)
 409                         return mbus_to_gbus_format[i].mbus_code;
 410         }
 411         return mbus_to_gbus_format[0].mbus_code;
 412 }
 413
 414 static int gb_camera_op_configure_streams(void *priv, unsigned int *nstreams,
 415                 unsigned int *flags, struct gb_camera_stream *streams)
 416 {
 417         struct gb_camera *gcam = priv;
 418         struct gb_camera_stream_config *gb_streams;
 419         unsigned int gb_flags = 0;
 420         unsigned int gb_nstreams = *nstreams;
 421         unsigned int i;
 422         int ret;
 423
 424         if (gb_nstreams > GB_CAMERA_MAX_STREAMS)
 425                 return -EINVAL;
 426
 427         gb_streams = kzalloc(gb_nstreams * sizeof(*gb_streams), GFP_KERNEL);
 428         if (!gb_streams)
 429                 return -ENOMEM;
 430
 431         for (i = 0; i < gb_nstreams; i++) {
 432                 gb_streams[i].width = streams[i].width;
 433                 gb_streams[i].height = streams[i].height;
 434                 gb_streams[i].format =
 435                         gb_camera_mbus_to_gb(streams[i].pixel_code);
 436         }
 437
 438         if (*flags & GB_CAMERA_IN_FLAG_TEST)
 439                 gb_flags |= GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY;
 440
 441         ret = gb_camera_configure_streams(gcam, &gb_nstreams,
 442                                           &gb_flags, gb_streams);
 443         if (ret < 0)
 444                 goto done;
 445         if (gb_nstreams > *nstreams) {
 446                 ret = -EINVAL;
 447                 goto done;
 448         }
 449
 450         *flags = 0;
 451         if (gb_flags & GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED)
 452                 *flags |= GB_CAMERA_OUT_FLAG_ADJUSTED;
 453
 454         for (i = 0; i < gb_nstreams; i++) {
 455                 streams[i].width = gb_streams[i].width;
 456                 streams[i].height = gb_streams[i].height;
 457                 streams[i].vc = gb_streams[i].vc;
 458                 streams[i].dt[0] = gb_streams[i].dt[0];
 459                 streams[i].dt[1] = gb_streams[i].dt[1];
 460                 streams[i].max_size = gb_streams[i].max_size;
 461                 streams[i].pixel_code =
 462                         gb_camera_gb_to_mbus(gb_streams[i].format);
 463         }
 464         *nstreams = gb_nstreams;
 465
 466 done:
 467         kfree(gb_streams);
 468         return ret;
 469 }
 470
 471 static int gb_camera_op_capture(void *priv, u32 request_id,
 472                 unsigned int streams, unsigned int num_frames,
 473                 size_t settings_size, const void *settings)
 474 {
 475         return gb_camera_capture(priv, request_id, streams, num_frames,
 476                                  settings_size, settings);
 477 }
 478
 479 static int gb_camera_op_flush(void *priv, u32 *request_id)
 480 {
 481         return gb_camera_flush(priv, request_id);
 482 }
 483
 484 struct gb_camera_ops gb_cam_ops = {
 485         .configure_streams = gb_camera_op_configure_streams,
 486         .capture = gb_camera_op_capture,
 487         .flush = gb_camera_op_flush,
 488 };
 489
 490 static int gb_camera_register_intf_ops(struct gb_camera *gcam)
 491 {
 492         return gb_camera_register(&gb_cam_ops, gcam);
 493 }
 494
 495 /* -----------------------------------------------------------------------------
 496  * DebugFS
 497  */
 498 static ssize_t gb_camera_debugfs_capabilities(struct gb_camera *gcam,
 499                 char *buf, size_t len)
 500 {
 501         return len;
 502 }
 503
 504 static ssize_t gb_camera_debugfs_configure_streams(struct gb_camera *gcam,
 505                 char *buf, size_t len)
 506 {
 507         struct gb_camera_debugfs_buffer *buffer =
 508                 &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_STREAMS];
 509         struct gb_camera_stream_config *streams;
 510         unsigned int nstreams;
 511         unsigned int flags;
 512         unsigned int i;
 513         char *token;
 514         int ret;
 515
 516         /* Retrieve number of streams to configure */
 517         token = strsep(&buf, ";");
 518         if (token == NULL)
 519                 return -EINVAL;
 520
 521         ret = kstrtouint(token, 10, &nstreams);
 522         if (ret < 0)
 523                 return ret;
 524
 525         if (nstreams > GB_CAMERA_MAX_STREAMS)
 526                 return -EINVAL;
 527
 528         token = strsep(&buf, ";");
 529         if (token == NULL)
 530                 return -EINVAL;
 531
 532         ret = kstrtouint(token, 10, &flags);
 533         if (ret < 0)
 534                 return ret;
 535
 536         /* For each stream to configure parse width, height and format */
 537         streams = kzalloc(nstreams * sizeof(*streams), GFP_KERNEL);
 538         if (!streams)
 539                 return -ENOMEM;
 540
 541         for (i = 0; i < nstreams; ++i) {
 542                 struct gb_camera_stream_config *stream = &streams[i];
 543
 544                 /* width */
 545                 token = strsep(&buf, ";");
 546                 if (token == NULL) {
 547                         ret = -EINVAL;
 548                         goto done;
 549                 }
 550                 ret = kstrtouint(token, 10, &stream->width);
 551                 if (ret < 0)
 552                         goto done;
 553
 554                 /* height */
 555                 token = strsep(&buf, ";");
 556                 if (token == NULL)
 557                         goto done;
 558
 559                 ret = kstrtouint(token, 10, &stream->height);
 560                 if (ret < 0)
 561                         goto done;
 562
 563                 /* Image format code */
 564                 token = strsep(&buf, ";");
 565                 if (token == NULL)
 566                         goto done;
 567
 568                 ret = kstrtouint(token, 16, &stream->format);
 569                 if (ret < 0)
 570                         goto done;
 571         }
 572
 573         ret = gb_camera_configure_streams(gcam, &nstreams, &flags, streams);
 574         if (ret < 0)
 575                 goto done;
 576
 577         buffer->length = sprintf(buffer->data, "%u;%u;", nstreams, flags);
 578
 579         for (i = 0; i < nstreams; ++i) {
 580                 struct gb_camera_stream_config *stream = &streams[i];
 581
 582                 buffer->length += sprintf(buffer->data + buffer->length,
 583                                           "%u;%u;%u;%u;%u;%u;%u;",
 584                                           stream->width, stream->height,
 585                                           stream->format, stream->vc,
 586                                           stream->dt[0], stream->dt[1],
 587                                           stream->max_size);
 588         }
 589
 590         ret = len;
 591
 592 done:
 593         kfree(streams);
 594         return ret;
 595 };
 596
 597 static ssize_t gb_camera_debugfs_capture(struct gb_camera *gcam,
 598                 char *buf, size_t len)
 599 {
 600         unsigned int request_id;
 601         unsigned int streams_mask;
 602         unsigned int num_frames;
 603         char *token;
 604         int ret;
 605
 606         /* Request id */
 607         token = strsep(&buf, ";");
 608         if (token == NULL)
 609                 return -EINVAL;
 610         ret = kstrtouint(token, 10, &request_id);
 611         if (ret < 0)
 612                 return ret;
 613
 614         /* Stream mask */
 615         token = strsep(&buf, ";");
 616         if (token == NULL)
 617                 return -EINVAL;
 618         ret = kstrtouint(token, 16, &streams_mask);
 619         if (ret < 0)
 620                 return ret;
 621
 622         /* number of frames */
 623         token = strsep(&buf, ";");
 624         if (token == NULL)
 625                 return -EINVAL;
 626         ret = kstrtouint(token, 10, &num_frames);
 627         if (ret < 0)
 628                 return ret;
 629
 630         ret = gb_camera_capture(gcam, request_id, streams_mask, num_frames, 0,
 631                                 NULL);
 632         if (ret < 0)
 633                 return ret;
 634
 635         return len;
 636 }
 637
 638 static ssize_t gb_camera_debugfs_flush(struct gb_camera *gcam,
 639                 char *buf, size_t len)
 640 {
 641         struct gb_camera_debugfs_buffer *buffer =
 642                 &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_FLUSH];
 643         unsigned int req_id;
 644         int ret;
 645
 646         ret = gb_camera_flush(gcam, &req_id);
 647         if (ret < 0)
 648                 return ret;
 649
 650         buffer->length = sprintf(buffer->data, "%u", req_id);
 651
 652         return len;
 653 }
 654
 655 struct gb_camera_debugfs_entry {
 656         const char *name;
 657         unsigned int mask;
 658         unsigned int buffer;
 659         ssize_t (*execute)(struct gb_camera *gcam, char *buf, size_t len);
 660 };
 661
 662 static const struct gb_camera_debugfs_entry gb_camera_debugfs_entries[] = {
 663         {
 664                 .name = "capabilities",
 665                 .mask = S_IFREG | S_IRUGO,
 666                 .buffer = GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES,
 667                 .execute = gb_camera_debugfs_capabilities,
 668         }, {
 669                 .name = "configure_streams",
 670                 .mask = S_IFREG | S_IRUGO | S_IWUGO,
 671                 .buffer = GB_CAMERA_DEBUGFS_BUFFER_STREAMS,
 672                 .execute = gb_camera_debugfs_configure_streams,
 673         }, {
 674                 .name = "capture",
 675                 .mask = S_IFREG | S_IRUGO | S_IWUGO,
 676                 .buffer = GB_CAMERA_DEBUGFS_BUFFER_CAPTURE,
 677                 .execute = gb_camera_debugfs_capture,
 678         }, {
 679                 .name = "flush",
 680                 .mask = S_IFREG | S_IRUGO | S_IWUGO,
 681                 .buffer = GB_CAMERA_DEBUGFS_BUFFER_FLUSH,
 682                 .execute = gb_camera_debugfs_flush,
 683         },
 684 };
 685
 686 static ssize_t gb_camera_debugfs_read(struct file *file, char __user *buf,
 687                                       size_t len, loff_t *offset)
 688 {
 689         const struct gb_camera_debugfs_entry *op = file->private_data;
 690         struct gb_camera *gcam = file->f_inode->i_private;
 691         struct gb_camera_debugfs_buffer *buffer;
 692         ssize_t ret;
 693
 694         /* For read-only entries the operation is triggered by a read. */
 695         if (!(op->mask & S_IWUGO)) {
 696                 ret = op->execute(gcam, NULL, 0);
 697                 if (ret < 0)
 698                         return ret;
 699         }
 700
 701         buffer = &gcam->debugfs.buffers[op->buffer];
 702
 703         return simple_read_from_buffer(buf, len, offset, buffer->data,
 704                                        buffer->length);
 705 }
 706
 707 static ssize_t gb_camera_debugfs_write(struct file *file,
 708                                        const char __user *buf, size_t len,
 709                                        loff_t *offset)
 710 {
 711         const struct gb_camera_debugfs_entry *op = file->private_data;
 712         struct gb_camera *gcam = file->f_inode->i_private;
 713         ssize_t ret;
 714         char *kbuf;
 715
 716         if (len > 1024)
 717                return -EINVAL;
 718
 719         kbuf = kmalloc(len + 1, GFP_KERNEL);
 720         if (kbuf == NULL)
 721                 return -ENOMEM;
 722
 723         if (copy_from_user(kbuf, buf, len)) {
 724                 ret = -EFAULT;
 725                 goto done;
 726         }
 727
 728         kbuf[len] = '\0';
 729
 730         ret = op->execute(gcam, kbuf, len);
 731
 732 done:
 733         kfree(kbuf);
 734         return ret;
 735 }
 736
 737 static int gb_camera_debugfs_open(struct inode *inode, struct file *file)
 738 {
 739         unsigned int i;
 740
 741         for (i = 0; i < ARRAY_SIZE(gb_camera_debugfs_entries); ++i) {
 742                 const struct gb_camera_debugfs_entry *entry =
 743                         &gb_camera_debugfs_entries[i];
 744
 745                 if (!strcmp(file->f_path.dentry->d_iname, entry->name)) {
 746                         file->private_data = (void *)entry;
 747                         break;
 748                 }
 749         }
 750
 751         return 0;
 752 }
 753
 754 static const struct file_operations gb_camera_debugfs_ops = {
 755         .open = gb_camera_debugfs_open,
 756         .read = gb_camera_debugfs_read,
 757         .write = gb_camera_debugfs_write,
 758 };
 759
 760 static int gb_camera_debugfs_init(struct gb_camera *gcam)
 761 {
 762         struct gb_connection *connection = gcam->connection;
 763         char dirname[27];
 764         unsigned int i;
 765
 766         /*
 767          * Create root debugfs entry and a file entry for each camera operation.
 768          */
 769         snprintf(dirname, 27, "camera-%u.%u", connection->intf->interface_id,
 770                  connection->bundle->id);
 771
 772         gcam->debugfs.root = debugfs_create_dir(dirname, gb_debugfs_get());
 773         if (IS_ERR(gcam->debugfs.root)) {
 774                 gcam_err(gcam, "debugfs root create failed (%ld)\n",
 775                          PTR_ERR(gcam->debugfs.root));
 776                 return PTR_ERR(gcam->debugfs.root);
 777         }
 778
 779         gcam->debugfs.buffers = vmalloc(sizeof(*gcam->debugfs.buffers) *
 780                                         GB_CAMERA_DEBUGFS_BUFFER_MAX);
 781         if (!gcam->debugfs.buffers)
 782                 return -ENOMEM;
 783
 784         for (i = 0; i < ARRAY_SIZE(gb_camera_debugfs_entries); ++i) {
 785                 const struct gb_camera_debugfs_entry *entry =
 786                         &gb_camera_debugfs_entries[i];
 787                 struct dentry *dentry;
 788
 789                 gcam->debugfs.buffers[i].length = 0;
 790
 791                 dentry = debugfs_create_file(entry->name, entry->mask,
 792                                              gcam->debugfs.root, gcam,
 793                                              &gb_camera_debugfs_ops);
 794                 if (IS_ERR(dentry)) {
 795                         gcam_err(gcam,
 796                                  "debugfs operation %s create failed (%ld)\n",
 797                                  entry->name, PTR_ERR(gcam->debugfs.root));
 798                         return PTR_ERR(dentry);
 799                 }
 800         }
 801
 802         return 0;
 803 }
 804
 805 static void gb_camera_debugfs_cleanup(struct gb_camera *gcam)
 806 {
 807         if (gcam->debugfs.root)
 808                 debugfs_remove_recursive(gcam->debugfs.root);
 809
 810         vfree(gcam->debugfs.buffers);
 811 }
 812
 813 /* -----------------------------------------------------------------------------
 814  * Init & Cleanup
 815  */
 816
 817 static void gb_camera_cleanup(struct gb_camera *gcam)
 818 {
 819         gb_camera_debugfs_cleanup(gcam);
 820
 821         if (gcam->data_connected) {
 822                 struct gb_interface *intf = gcam->connection->intf;
 823                 struct gb_svc *svc = gcam->connection->hd->svc;
 824
 825                 gb_svc_connection_destroy(svc, intf->interface_id,
 826                                           ES2_APB_CDSI0_CPORT, svc->ap_intf_id,
 827                                           ES2_APB_CDSI1_CPORT);
 828         }
 829
 830         kfree(gcam);
 831 }
 832
 833 static int gb_camera_connection_init(struct gb_connection *connection)
 834 {
 835         struct gb_svc *svc = connection->hd->svc;
 836         struct gb_camera *gcam;
 837         int ret;
 838
 839         gcam = kzalloc(sizeof(*gcam), GFP_KERNEL);
 840         if (!gcam)
 841                 return -ENOMEM;
 842
 843         gcam->connection = connection;
 844         connection->private = gcam;
 845
 846         /*
 847          * Create the data connection between camera module CDSI0 and APB CDS1.
 848          * The CPort IDs are hardcoded by the ES2 bridges.
 849          */
 850         ret = gb_svc_connection_create(svc, connection->intf->interface_id,
 851                                        ES2_APB_CDSI0_CPORT, svc->ap_intf_id,
 852                                        ES2_APB_CDSI1_CPORT, false);
 853         if (ret < 0)
 854                 goto error;
 855
 856         gcam->data_connected = true;
 857
 858         ret = gb_camera_debugfs_init(gcam);
 859         if (ret < 0)
 860                 goto error;
 861
 862         ret = gb_camera_register_intf_ops(gcam);
 863         if (ret < 0)
 864                 goto error;
 865
 866         return 0;
 867
 868 error:
 869         gb_camera_cleanup(gcam);
 870         return ret;
 871 }
 872
 873 static void gb_camera_connection_exit(struct gb_connection *connection)
 874 {
 875         struct gb_camera *gcam = connection->private;
 876
 877         gb_camera_cleanup(gcam);
 878 }
 879
 880 static struct gb_protocol camera_protocol = {
 881         .name                   = "camera",
 882         .id                     = GREYBUS_PROTOCOL_CAMERA_MGMT,
 883         .major                  = GB_CAMERA_VERSION_MAJOR,
 884         .minor                  = GB_CAMERA_VERSION_MINOR,
 885         .connection_init        = gb_camera_connection_init,
 886         .connection_exit        = gb_camera_connection_exit,
 887         .request_recv           = gb_camera_event_recv,
 888 };
 889
 890 gb_protocol_driver(&camera_protocol);
 891
 892 MODULE_LICENSE("GPL v2");