1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * vsp1_histo.c -- R-Car VSP1 Histogram API 4 * 5 * Copyright (C) 2016 Renesas Electronics Corporation 6 * Copyright (C) 2016 Laurent Pinchart 7 * 8 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) 9 */ 10 11 #include <linux/device.h> 12 #include <linux/gfp.h> 13 14 #include <media/v4l2-ioctl.h> 15 #include <media/v4l2-subdev.h> 16 #include <media/videobuf2-vmalloc.h> 17 18 #include "vsp1.h" 19 #include "vsp1_histo.h" 20 #include "vsp1_pipe.h" 21 22 #define HISTO_MIN_SIZE 4U 23 #define HISTO_MAX_SIZE 8192U 24 25 /* ----------------------------------------------------------------------------- 26 * Buffer Operations 27 */ 28 29 static inline struct vsp1_histogram_buffer * 30 to_vsp1_histogram_buffer(struct vb2_v4l2_buffer *vbuf) 31 { 32 return container_of(vbuf, struct vsp1_histogram_buffer, buf); 33 } 34 35 struct vsp1_histogram_buffer * 36 vsp1_histogram_buffer_get(struct vsp1_histogram *histo) 37 { 38 struct vsp1_histogram_buffer *buf = NULL; 39 40 spin_lock(&histo->irqlock); 41 42 if (list_empty(&histo->irqqueue)) 43 goto done; 44 45 buf = list_first_entry(&histo->irqqueue, struct vsp1_histogram_buffer, 46 queue); 47 list_del(&buf->queue); 48 histo->readout = true; 49 50 done: 51 spin_unlock(&histo->irqlock); 52 return buf; 53 } 54 55 void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo, 56 struct vsp1_histogram_buffer *buf, 57 size_t size) 58 { 59 struct vsp1_pipeline *pipe = histo->entity.pipe; 60 61 /* 62 * The pipeline pointer is guaranteed to be valid as this function is 63 * called from the frame completion interrupt handler, which can only 64 * occur when video streaming is active. 65 */ 66 buf->buf.sequence = pipe->sequence; 67 buf->buf.vb2_buf.timestamp = ktime_get_ns(); 68 vb2_set_plane_payload(&buf->buf.vb2_buf, 0, size); 69 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE); 70 71 spin_lock(&histo->irqlock); 72 histo->readout = false; 73 wake_up(&histo->wait_queue); 74 spin_unlock(&histo->irqlock); 75 } 76 77 /* ----------------------------------------------------------------------------- 78 * videobuf2 Queue Operations 79 */ 80 81 static int histo_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers, 82 unsigned int *nplanes, unsigned int sizes[], 83 struct device *alloc_devs[]) 84 { 85 struct vsp1_histogram *histo = vb2_get_drv_priv(vq); 86 87 if (*nplanes) { 88 if (*nplanes != 1) 89 return -EINVAL; 90 91 if (sizes[0] < histo->data_size) 92 return -EINVAL; 93 94 return 0; 95 } 96 97 *nplanes = 1; 98 sizes[0] = histo->data_size; 99 100 return 0; 101 } 102 103 static int histo_buffer_prepare(struct vb2_buffer *vb) 104 { 105 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 106 struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue); 107 struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf); 108 109 if (vb->num_planes != 1) 110 return -EINVAL; 111 112 if (vb2_plane_size(vb, 0) < histo->data_size) 113 return -EINVAL; 114 115 buf->addr = vb2_plane_vaddr(vb, 0); 116 117 return 0; 118 } 119 120 static void histo_buffer_queue(struct vb2_buffer *vb) 121 { 122 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 123 struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue); 124 struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf); 125 126 spin_lock_irq(&histo->irqlock); 127 list_add_tail(&buf->queue, &histo->irqqueue); 128 spin_unlock_irq(&histo->irqlock); 129 } 130 131 static int histo_start_streaming(struct vb2_queue *vq, unsigned int count) 132 { 133 return 0; 134 } 135 136 static void histo_stop_streaming(struct vb2_queue *vq) 137 { 138 struct vsp1_histogram *histo = vb2_get_drv_priv(vq); 139 struct vsp1_histogram_buffer *buffer; 140 141 spin_lock_irq(&histo->irqlock); 142 143 /* Remove all buffers from the IRQ queue. */ 144 list_for_each_entry(buffer, &histo->irqqueue, queue) 145 vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR); 146 INIT_LIST_HEAD(&histo->irqqueue); 147 148 /* Wait for the buffer being read out (if any) to complete. */ 149 wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock); 150 151 spin_unlock_irq(&histo->irqlock); 152 } 153 154 static const struct vb2_ops histo_video_queue_qops = { 155 .queue_setup = histo_queue_setup, 156 .buf_prepare = histo_buffer_prepare, 157 .buf_queue = histo_buffer_queue, 158 .wait_prepare = vb2_ops_wait_prepare, 159 .wait_finish = vb2_ops_wait_finish, 160 .start_streaming = histo_start_streaming, 161 .stop_streaming = histo_stop_streaming, 162 }; 163 164 /* ----------------------------------------------------------------------------- 165 * V4L2 Subdevice Operations 166 */ 167 168 static int histo_enum_mbus_code(struct v4l2_subdev *subdev, 169 struct v4l2_subdev_state *sd_state, 170 struct v4l2_subdev_mbus_code_enum *code) 171 { 172 struct vsp1_histogram *histo = subdev_to_histo(subdev); 173 174 if (code->pad == HISTO_PAD_SOURCE) { 175 code->code = MEDIA_BUS_FMT_FIXED; 176 return 0; 177 } 178 179 return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, 180 histo->formats, 181 histo->num_formats); 182 } 183 184 static int histo_enum_frame_size(struct v4l2_subdev *subdev, 185 struct v4l2_subdev_state *sd_state, 186 struct v4l2_subdev_frame_size_enum *fse) 187 { 188 if (fse->pad != HISTO_PAD_SINK) 189 return -EINVAL; 190 191 return vsp1_subdev_enum_frame_size(subdev, sd_state, fse, 192 HISTO_MIN_SIZE, 193 HISTO_MIN_SIZE, HISTO_MAX_SIZE, 194 HISTO_MAX_SIZE); 195 } 196 197 static int histo_get_selection(struct v4l2_subdev *subdev, 198 struct v4l2_subdev_state *sd_state, 199 struct v4l2_subdev_selection *sel) 200 { 201 struct vsp1_histogram *histo = subdev_to_histo(subdev); 202 struct v4l2_subdev_state *state; 203 struct v4l2_mbus_framefmt *format; 204 struct v4l2_rect *crop; 205 int ret = 0; 206 207 if (sel->pad != HISTO_PAD_SINK) 208 return -EINVAL; 209 210 mutex_lock(&histo->entity.lock); 211 212 state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which); 213 if (!state) { 214 ret = -EINVAL; 215 goto done; 216 } 217 218 switch (sel->target) { 219 case V4L2_SEL_TGT_COMPOSE_BOUNDS: 220 case V4L2_SEL_TGT_COMPOSE_DEFAULT: 221 crop = vsp1_entity_get_pad_selection(&histo->entity, state, 222 HISTO_PAD_SINK, 223 V4L2_SEL_TGT_CROP); 224 sel->r.left = 0; 225 sel->r.top = 0; 226 sel->r.width = crop->width; 227 sel->r.height = crop->height; 228 break; 229 230 case V4L2_SEL_TGT_CROP_BOUNDS: 231 case V4L2_SEL_TGT_CROP_DEFAULT: 232 format = v4l2_subdev_state_get_format(state, HISTO_PAD_SINK); 233 sel->r.left = 0; 234 sel->r.top = 0; 235 sel->r.width = format->width; 236 sel->r.height = format->height; 237 break; 238 239 case V4L2_SEL_TGT_COMPOSE: 240 case V4L2_SEL_TGT_CROP: 241 sel->r = *vsp1_entity_get_pad_selection(&histo->entity, state, 242 sel->pad, sel->target); 243 break; 244 245 default: 246 ret = -EINVAL; 247 break; 248 } 249 250 done: 251 mutex_unlock(&histo->entity.lock); 252 return ret; 253 } 254 255 static int histo_set_crop(struct v4l2_subdev *subdev, 256 struct v4l2_subdev_state *sd_state, 257 struct v4l2_subdev_selection *sel) 258 { 259 struct vsp1_histogram *histo = subdev_to_histo(subdev); 260 struct v4l2_mbus_framefmt *format; 261 struct v4l2_rect *selection; 262 263 /* The crop rectangle must be inside the input frame. */ 264 format = v4l2_subdev_state_get_format(sd_state, HISTO_PAD_SINK); 265 sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1); 266 sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1); 267 sel->r.width = clamp_t(unsigned int, sel->r.width, HISTO_MIN_SIZE, 268 format->width - sel->r.left); 269 sel->r.height = clamp_t(unsigned int, sel->r.height, HISTO_MIN_SIZE, 270 format->height - sel->r.top); 271 272 /* Set the crop rectangle and reset the compose rectangle. */ 273 selection = vsp1_entity_get_pad_selection(&histo->entity, sd_state, 274 sel->pad, V4L2_SEL_TGT_CROP); 275 *selection = sel->r; 276 277 selection = vsp1_entity_get_pad_selection(&histo->entity, sd_state, 278 sel->pad, 279 V4L2_SEL_TGT_COMPOSE); 280 *selection = sel->r; 281 282 return 0; 283 } 284 285 static int histo_set_compose(struct v4l2_subdev *subdev, 286 struct v4l2_subdev_state *sd_state, 287 struct v4l2_subdev_selection *sel) 288 { 289 struct vsp1_histogram *histo = subdev_to_histo(subdev); 290 struct v4l2_rect *compose; 291 struct v4l2_rect *crop; 292 unsigned int ratio; 293 294 /* 295 * The compose rectangle is used to configure downscaling, the top left 296 * corner is fixed to (0,0) and the size to 1/2 or 1/4 of the crop 297 * rectangle. 298 */ 299 sel->r.left = 0; 300 sel->r.top = 0; 301 302 crop = vsp1_entity_get_pad_selection(&histo->entity, sd_state, 303 sel->pad, 304 V4L2_SEL_TGT_CROP); 305 306 /* 307 * Clamp the width and height to acceptable values first and then 308 * compute the closest rounded dividing ratio. 309 * 310 * Ratio Rounded ratio 311 * -------------------------- 312 * [1.0 1.5[ 1 313 * [1.5 3.0[ 2 314 * [3.0 4.0] 4 315 * 316 * The rounded ratio can be computed using 317 * 318 * 1 << (ceil(ratio * 2) / 3) 319 */ 320 sel->r.width = clamp(sel->r.width, crop->width / 4, crop->width); 321 ratio = 1 << (crop->width * 2 / sel->r.width / 3); 322 sel->r.width = crop->width / ratio; 323 324 325 sel->r.height = clamp(sel->r.height, crop->height / 4, crop->height); 326 ratio = 1 << (crop->height * 2 / sel->r.height / 3); 327 sel->r.height = crop->height / ratio; 328 329 compose = vsp1_entity_get_pad_selection(&histo->entity, sd_state, 330 sel->pad, 331 V4L2_SEL_TGT_COMPOSE); 332 *compose = sel->r; 333 334 return 0; 335 } 336 337 static int histo_set_selection(struct v4l2_subdev *subdev, 338 struct v4l2_subdev_state *sd_state, 339 struct v4l2_subdev_selection *sel) 340 { 341 struct vsp1_histogram *histo = subdev_to_histo(subdev); 342 struct v4l2_subdev_state *state; 343 int ret; 344 345 if (sel->pad != HISTO_PAD_SINK) 346 return -EINVAL; 347 348 mutex_lock(&histo->entity.lock); 349 350 state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which); 351 if (!state) { 352 ret = -EINVAL; 353 goto done; 354 } 355 356 if (sel->target == V4L2_SEL_TGT_CROP) 357 ret = histo_set_crop(subdev, state, sel); 358 else if (sel->target == V4L2_SEL_TGT_COMPOSE) 359 ret = histo_set_compose(subdev, state, sel); 360 else 361 ret = -EINVAL; 362 363 done: 364 mutex_unlock(&histo->entity.lock); 365 return ret; 366 } 367 368 static int histo_get_format(struct v4l2_subdev *subdev, 369 struct v4l2_subdev_state *sd_state, 370 struct v4l2_subdev_format *fmt) 371 { 372 if (fmt->pad == HISTO_PAD_SOURCE) { 373 fmt->format.code = MEDIA_BUS_FMT_FIXED; 374 fmt->format.width = 0; 375 fmt->format.height = 0; 376 fmt->format.field = V4L2_FIELD_NONE; 377 fmt->format.colorspace = V4L2_COLORSPACE_RAW; 378 return 0; 379 } 380 381 return vsp1_subdev_get_pad_format(subdev, sd_state, fmt); 382 } 383 384 static int histo_set_format(struct v4l2_subdev *subdev, 385 struct v4l2_subdev_state *sd_state, 386 struct v4l2_subdev_format *fmt) 387 { 388 struct vsp1_histogram *histo = subdev_to_histo(subdev); 389 390 if (fmt->pad != HISTO_PAD_SINK) 391 return histo_get_format(subdev, sd_state, fmt); 392 393 return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, 394 histo->formats, histo->num_formats, 395 HISTO_MIN_SIZE, HISTO_MIN_SIZE, 396 HISTO_MAX_SIZE, HISTO_MAX_SIZE); 397 } 398 399 static const struct v4l2_subdev_pad_ops histo_pad_ops = { 400 .enum_mbus_code = histo_enum_mbus_code, 401 .enum_frame_size = histo_enum_frame_size, 402 .get_fmt = histo_get_format, 403 .set_fmt = histo_set_format, 404 .get_selection = histo_get_selection, 405 .set_selection = histo_set_selection, 406 }; 407 408 static const struct v4l2_subdev_ops histo_ops = { 409 .pad = &histo_pad_ops, 410 }; 411 412 /* ----------------------------------------------------------------------------- 413 * V4L2 ioctls 414 */ 415 416 static int histo_v4l2_querycap(struct file *file, void *fh, 417 struct v4l2_capability *cap) 418 { 419 struct v4l2_fh *vfh = file->private_data; 420 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 421 422 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING 423 | V4L2_CAP_VIDEO_CAPTURE_MPLANE 424 | V4L2_CAP_VIDEO_OUTPUT_MPLANE 425 | V4L2_CAP_META_CAPTURE; 426 427 strscpy(cap->driver, "vsp1", sizeof(cap->driver)); 428 strscpy(cap->card, histo->video.name, sizeof(cap->card)); 429 430 return 0; 431 } 432 433 static int histo_v4l2_enum_format(struct file *file, void *fh, 434 struct v4l2_fmtdesc *f) 435 { 436 struct v4l2_fh *vfh = file->private_data; 437 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 438 439 if (f->index > 0 || f->type != histo->queue.type) 440 return -EINVAL; 441 442 f->pixelformat = histo->meta_format; 443 444 return 0; 445 } 446 447 static int histo_v4l2_get_format(struct file *file, void *fh, 448 struct v4l2_format *format) 449 { 450 struct v4l2_fh *vfh = file->private_data; 451 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 452 struct v4l2_meta_format *meta = &format->fmt.meta; 453 454 if (format->type != histo->queue.type) 455 return -EINVAL; 456 457 memset(meta, 0, sizeof(*meta)); 458 459 meta->dataformat = histo->meta_format; 460 meta->buffersize = histo->data_size; 461 462 return 0; 463 } 464 465 static const struct v4l2_ioctl_ops histo_v4l2_ioctl_ops = { 466 .vidioc_querycap = histo_v4l2_querycap, 467 .vidioc_enum_fmt_meta_cap = histo_v4l2_enum_format, 468 .vidioc_g_fmt_meta_cap = histo_v4l2_get_format, 469 .vidioc_s_fmt_meta_cap = histo_v4l2_get_format, 470 .vidioc_try_fmt_meta_cap = histo_v4l2_get_format, 471 .vidioc_reqbufs = vb2_ioctl_reqbufs, 472 .vidioc_querybuf = vb2_ioctl_querybuf, 473 .vidioc_qbuf = vb2_ioctl_qbuf, 474 .vidioc_dqbuf = vb2_ioctl_dqbuf, 475 .vidioc_create_bufs = vb2_ioctl_create_bufs, 476 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 477 .vidioc_streamon = vb2_ioctl_streamon, 478 .vidioc_streamoff = vb2_ioctl_streamoff, 479 }; 480 481 /* ----------------------------------------------------------------------------- 482 * V4L2 File Operations 483 */ 484 485 static const struct v4l2_file_operations histo_v4l2_fops = { 486 .owner = THIS_MODULE, 487 .unlocked_ioctl = video_ioctl2, 488 .open = v4l2_fh_open, 489 .release = vb2_fop_release, 490 .poll = vb2_fop_poll, 491 .mmap = vb2_fop_mmap, 492 }; 493 494 static void vsp1_histogram_cleanup(struct vsp1_histogram *histo) 495 { 496 if (video_is_registered(&histo->video)) 497 video_unregister_device(&histo->video); 498 499 media_entity_cleanup(&histo->video.entity); 500 } 501 502 void vsp1_histogram_destroy(struct vsp1_entity *entity) 503 { 504 struct vsp1_histogram *histo = subdev_to_histo(&entity->subdev); 505 506 vsp1_histogram_cleanup(histo); 507 } 508 509 int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo, 510 enum vsp1_entity_type type, const char *name, 511 const struct vsp1_entity_operations *ops, 512 const unsigned int *formats, unsigned int num_formats, 513 size_t data_size, u32 meta_format) 514 { 515 int ret; 516 517 histo->formats = formats; 518 histo->num_formats = num_formats; 519 histo->data_size = data_size; 520 histo->meta_format = meta_format; 521 522 histo->pad.flags = MEDIA_PAD_FL_SINK; 523 histo->video.vfl_dir = VFL_DIR_RX; 524 525 mutex_init(&histo->lock); 526 spin_lock_init(&histo->irqlock); 527 INIT_LIST_HEAD(&histo->irqqueue); 528 init_waitqueue_head(&histo->wait_queue); 529 530 /* Initialize the VSP entity... */ 531 histo->entity.ops = ops; 532 histo->entity.type = type; 533 534 ret = vsp1_entity_init(vsp1, &histo->entity, name, 2, &histo_ops, 535 MEDIA_ENT_F_PROC_VIDEO_STATISTICS); 536 if (ret < 0) 537 return ret; 538 539 /* ... and the media entity... */ 540 ret = media_entity_pads_init(&histo->video.entity, 1, &histo->pad); 541 if (ret < 0) 542 return ret; 543 544 /* ... and the video node... */ 545 histo->video.v4l2_dev = &vsp1->v4l2_dev; 546 histo->video.fops = &histo_v4l2_fops; 547 snprintf(histo->video.name, sizeof(histo->video.name), 548 "%s histo", histo->entity.subdev.name); 549 histo->video.vfl_type = VFL_TYPE_VIDEO; 550 histo->video.release = video_device_release_empty; 551 histo->video.ioctl_ops = &histo_v4l2_ioctl_ops; 552 histo->video.device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING; 553 554 video_set_drvdata(&histo->video, histo); 555 556 /* ... and the buffers queue... */ 557 histo->queue.type = V4L2_BUF_TYPE_META_CAPTURE; 558 histo->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 559 histo->queue.lock = &histo->lock; 560 histo->queue.drv_priv = histo; 561 histo->queue.buf_struct_size = sizeof(struct vsp1_histogram_buffer); 562 histo->queue.ops = &histo_video_queue_qops; 563 histo->queue.mem_ops = &vb2_vmalloc_memops; 564 histo->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 565 histo->queue.dev = vsp1->dev; 566 ret = vb2_queue_init(&histo->queue); 567 if (ret < 0) { 568 dev_err(vsp1->dev, "failed to initialize vb2 queue\n"); 569 goto error; 570 } 571 572 /* ... and register the video device. */ 573 histo->video.queue = &histo->queue; 574 ret = video_register_device(&histo->video, VFL_TYPE_VIDEO, -1); 575 if (ret < 0) { 576 dev_err(vsp1->dev, "failed to register video device\n"); 577 goto error; 578 } 579 580 return 0; 581 582 error: 583 vsp1_histogram_cleanup(histo); 584 return ret; 585 } 586