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 29static inline struct vsp1_histogram_buffer * 30to_vsp1_histogram_buffer(struct vb2_v4l2_buffer *vbuf) 31{ 32 return container_of(vbuf, struct vsp1_histogram_buffer, buf); 33} 34 35struct vsp1_histogram_buffer * 36vsp1_histogram_buffer_get(struct vsp1_histogram *histo) 37{ 38 struct vsp1_histogram_buffer *buf = NULL; 39 unsigned long flags; 40 41 spin_lock_irqsave(&histo->irqlock, flags); 42 43 if (list_empty(&histo->irqqueue)) 44 goto done; 45 46 buf = list_first_entry(&histo->irqqueue, struct vsp1_histogram_buffer, 47 queue); 48 list_del(&buf->queue); 49 histo->readout = true; 50 51done: 52 spin_unlock_irqrestore(&histo->irqlock, flags); 53 return buf; 54} 55 56void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo, 57 struct vsp1_histogram_buffer *buf, 58 size_t size) 59{ 60 struct vsp1_pipeline *pipe = histo->entity.pipe; 61 unsigned long flags; 62 63 /* 64 * The pipeline pointer is guaranteed to be valid as this function is 65 * called from the frame completion interrupt handler, which can only 66 * occur when video streaming is active. 67 */ 68 buf->buf.sequence = pipe->sequence; 69 buf->buf.vb2_buf.timestamp = ktime_get_ns(); 70 vb2_set_plane_payload(&buf->buf.vb2_buf, 0, size); 71 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE); 72 73 spin_lock_irqsave(&histo->irqlock, flags); 74 histo->readout = false; 75 wake_up(&histo->wait_queue); 76 spin_unlock_irqrestore(&histo->irqlock, flags); 77} 78 79/* ----------------------------------------------------------------------------- 80 * videobuf2 Queue Operations 81 */ 82 83static int histo_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers, 84 unsigned int *nplanes, unsigned int sizes[], 85 struct device *alloc_devs[]) 86{ 87 struct vsp1_histogram *histo = vb2_get_drv_priv(vq); 88 89 if (*nplanes) { 90 if (*nplanes != 1) 91 return -EINVAL; 92 93 if (sizes[0] < histo->data_size) 94 return -EINVAL; 95 96 return 0; 97 } 98 99 *nplanes = 1; 100 sizes[0] = histo->data_size; 101 102 return 0; 103} 104 105static int histo_buffer_prepare(struct vb2_buffer *vb) 106{ 107 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 108 struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue); 109 struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf); 110 111 if (vb->num_planes != 1) 112 return -EINVAL; 113 114 if (vb2_plane_size(vb, 0) < histo->data_size) 115 return -EINVAL; 116 117 buf->addr = vb2_plane_vaddr(vb, 0); 118 119 return 0; 120} 121 122static void histo_buffer_queue(struct vb2_buffer *vb) 123{ 124 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 125 struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue); 126 struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf); 127 unsigned long flags; 128 129 spin_lock_irqsave(&histo->irqlock, flags); 130 list_add_tail(&buf->queue, &histo->irqqueue); 131 spin_unlock_irqrestore(&histo->irqlock, flags); 132} 133 134static int histo_start_streaming(struct vb2_queue *vq, unsigned int count) 135{ 136 return 0; 137} 138 139static void histo_stop_streaming(struct vb2_queue *vq) 140{ 141 struct vsp1_histogram *histo = vb2_get_drv_priv(vq); 142 struct vsp1_histogram_buffer *buffer; 143 unsigned long flags; 144 145 spin_lock_irqsave(&histo->irqlock, flags); 146 147 /* Remove all buffers from the IRQ queue. */ 148 list_for_each_entry(buffer, &histo->irqqueue, queue) 149 vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR); 150 INIT_LIST_HEAD(&histo->irqqueue); 151 152 /* Wait for the buffer being read out (if any) to complete. */ 153 wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock); 154 155 spin_unlock_irqrestore(&histo->irqlock, flags); 156} 157 158static const struct vb2_ops histo_video_queue_qops = { 159 .queue_setup = histo_queue_setup, 160 .buf_prepare = histo_buffer_prepare, 161 .buf_queue = histo_buffer_queue, 162 .wait_prepare = vb2_ops_wait_prepare, 163 .wait_finish = vb2_ops_wait_finish, 164 .start_streaming = histo_start_streaming, 165 .stop_streaming = histo_stop_streaming, 166}; 167 168/* ----------------------------------------------------------------------------- 169 * V4L2 Subdevice Operations 170 */ 171 172static int histo_enum_mbus_code(struct v4l2_subdev *subdev, 173 struct v4l2_subdev_pad_config *cfg, 174 struct v4l2_subdev_mbus_code_enum *code) 175{ 176 struct vsp1_histogram *histo = subdev_to_histo(subdev); 177 178 if (code->pad == HISTO_PAD_SOURCE) { 179 code->code = MEDIA_BUS_FMT_FIXED; 180 return 0; 181 } 182 183 return vsp1_subdev_enum_mbus_code(subdev, cfg, code, histo->formats, 184 histo->num_formats); 185} 186 187static int histo_enum_frame_size(struct v4l2_subdev *subdev, 188 struct v4l2_subdev_pad_config *cfg, 189 struct v4l2_subdev_frame_size_enum *fse) 190{ 191 if (fse->pad != HISTO_PAD_SINK) 192 return -EINVAL; 193 194 return vsp1_subdev_enum_frame_size(subdev, cfg, fse, HISTO_MIN_SIZE, 195 HISTO_MIN_SIZE, HISTO_MAX_SIZE, 196 HISTO_MAX_SIZE); 197} 198 199static int histo_get_selection(struct v4l2_subdev *subdev, 200 struct v4l2_subdev_pad_config *cfg, 201 struct v4l2_subdev_selection *sel) 202{ 203 struct vsp1_histogram *histo = subdev_to_histo(subdev); 204 struct v4l2_subdev_pad_config *config; 205 struct v4l2_mbus_framefmt *format; 206 struct v4l2_rect *crop; 207 int ret = 0; 208 209 if (sel->pad != HISTO_PAD_SINK) 210 return -EINVAL; 211 212 mutex_lock(&histo->entity.lock); 213 214 config = vsp1_entity_get_pad_config(&histo->entity, cfg, sel->which); 215 if (!config) { 216 ret = -EINVAL; 217 goto done; 218 } 219 220 switch (sel->target) { 221 case V4L2_SEL_TGT_COMPOSE_BOUNDS: 222 case V4L2_SEL_TGT_COMPOSE_DEFAULT: 223 crop = vsp1_entity_get_pad_selection(&histo->entity, config, 224 HISTO_PAD_SINK, 225 V4L2_SEL_TGT_CROP); 226 sel->r.left = 0; 227 sel->r.top = 0; 228 sel->r.width = crop->width; 229 sel->r.height = crop->height; 230 break; 231 232 case V4L2_SEL_TGT_CROP_BOUNDS: 233 case V4L2_SEL_TGT_CROP_DEFAULT: 234 format = vsp1_entity_get_pad_format(&histo->entity, config, 235 HISTO_PAD_SINK); 236 sel->r.left = 0; 237 sel->r.top = 0; 238 sel->r.width = format->width; 239 sel->r.height = format->height; 240 break; 241 242 case V4L2_SEL_TGT_COMPOSE: 243 case V4L2_SEL_TGT_CROP: 244 sel->r = *vsp1_entity_get_pad_selection(&histo->entity, config, 245 sel->pad, sel->target); 246 break; 247 248 default: 249 ret = -EINVAL; 250 break; 251 } 252 253done: 254 mutex_unlock(&histo->entity.lock); 255 return ret; 256} 257 258static int histo_set_crop(struct v4l2_subdev *subdev, 259 struct v4l2_subdev_pad_config *config, 260 struct v4l2_subdev_selection *sel) 261{ 262 struct vsp1_histogram *histo = subdev_to_histo(subdev); 263 struct v4l2_mbus_framefmt *format; 264 struct v4l2_rect *selection; 265 266 /* The crop rectangle must be inside the input frame. */ 267 format = vsp1_entity_get_pad_format(&histo->entity, config, 268 HISTO_PAD_SINK); 269 sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1); 270 sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1); 271 sel->r.width = clamp_t(unsigned int, sel->r.width, HISTO_MIN_SIZE, 272 format->width - sel->r.left); 273 sel->r.height = clamp_t(unsigned int, sel->r.height, HISTO_MIN_SIZE, 274 format->height - sel->r.top); 275 276 /* Set the crop rectangle and reset the compose rectangle. */ 277 selection = vsp1_entity_get_pad_selection(&histo->entity, config, 278 sel->pad, V4L2_SEL_TGT_CROP); 279 *selection = sel->r; 280 281 selection = vsp1_entity_get_pad_selection(&histo->entity, config, 282 sel->pad, 283 V4L2_SEL_TGT_COMPOSE); 284 *selection = sel->r; 285 286 return 0; 287} 288 289static int histo_set_compose(struct v4l2_subdev *subdev, 290 struct v4l2_subdev_pad_config *config, 291 struct v4l2_subdev_selection *sel) 292{ 293 struct vsp1_histogram *histo = subdev_to_histo(subdev); 294 struct v4l2_rect *compose; 295 struct v4l2_rect *crop; 296 unsigned int ratio; 297 298 /* 299 * The compose rectangle is used to configure downscaling, the top left 300 * corner is fixed to (0,0) and the size to 1/2 or 1/4 of the crop 301 * rectangle. 302 */ 303 sel->r.left = 0; 304 sel->r.top = 0; 305 306 crop = vsp1_entity_get_pad_selection(&histo->entity, config, sel->pad, 307 V4L2_SEL_TGT_CROP); 308 309 /* 310 * Clamp the width and height to acceptable values first and then 311 * compute the closest rounded dividing ratio. 312 * 313 * Ratio Rounded ratio 314 * -------------------------- 315 * [1.0 1.5[ 1 316 * [1.5 3.0[ 2 317 * [3.0 4.0] 4 318 * 319 * The rounded ratio can be computed using 320 * 321 * 1 << (ceil(ratio * 2) / 3) 322 */ 323 sel->r.width = clamp(sel->r.width, crop->width / 4, crop->width); 324 ratio = 1 << (crop->width * 2 / sel->r.width / 3); 325 sel->r.width = crop->width / ratio; 326 327 328 sel->r.height = clamp(sel->r.height, crop->height / 4, crop->height); 329 ratio = 1 << (crop->height * 2 / sel->r.height / 3); 330 sel->r.height = crop->height / ratio; 331 332 compose = vsp1_entity_get_pad_selection(&histo->entity, config, 333 sel->pad, 334 V4L2_SEL_TGT_COMPOSE); 335 *compose = sel->r; 336 337 return 0; 338} 339 340static int histo_set_selection(struct v4l2_subdev *subdev, 341 struct v4l2_subdev_pad_config *cfg, 342 struct v4l2_subdev_selection *sel) 343{ 344 struct vsp1_histogram *histo = subdev_to_histo(subdev); 345 struct v4l2_subdev_pad_config *config; 346 int ret; 347 348 if (sel->pad != HISTO_PAD_SINK) 349 return -EINVAL; 350 351 mutex_lock(&histo->entity.lock); 352 353 config = vsp1_entity_get_pad_config(&histo->entity, cfg, sel->which); 354 if (!config) { 355 ret = -EINVAL; 356 goto done; 357 } 358 359 if (sel->target == V4L2_SEL_TGT_CROP) 360 ret = histo_set_crop(subdev, config, sel); 361 else if (sel->target == V4L2_SEL_TGT_COMPOSE) 362 ret = histo_set_compose(subdev, config, sel); 363 else 364 ret = -EINVAL; 365 366done: 367 mutex_unlock(&histo->entity.lock); 368 return ret; 369} 370 371static int histo_get_format(struct v4l2_subdev *subdev, 372 struct v4l2_subdev_pad_config *cfg, 373 struct v4l2_subdev_format *fmt) 374{ 375 if (fmt->pad == HISTO_PAD_SOURCE) { 376 fmt->format.code = MEDIA_BUS_FMT_FIXED; 377 fmt->format.width = 0; 378 fmt->format.height = 0; 379 fmt->format.field = V4L2_FIELD_NONE; 380 fmt->format.colorspace = V4L2_COLORSPACE_RAW; 381 return 0; 382 } 383 384 return vsp1_subdev_get_pad_format(subdev, cfg, fmt); 385} 386 387static int histo_set_format(struct v4l2_subdev *subdev, 388 struct v4l2_subdev_pad_config *cfg, 389 struct v4l2_subdev_format *fmt) 390{ 391 struct vsp1_histogram *histo = subdev_to_histo(subdev); 392 393 if (fmt->pad != HISTO_PAD_SINK) 394 return histo_get_format(subdev, cfg, fmt); 395 396 return vsp1_subdev_set_pad_format(subdev, cfg, fmt, 397 histo->formats, histo->num_formats, 398 HISTO_MIN_SIZE, HISTO_MIN_SIZE, 399 HISTO_MAX_SIZE, HISTO_MAX_SIZE); 400} 401 402static const struct v4l2_subdev_pad_ops histo_pad_ops = { 403 .enum_mbus_code = histo_enum_mbus_code, 404 .enum_frame_size = histo_enum_frame_size, 405 .get_fmt = histo_get_format, 406 .set_fmt = histo_set_format, 407 .get_selection = histo_get_selection, 408 .set_selection = histo_set_selection, 409}; 410 411static const struct v4l2_subdev_ops histo_ops = { 412 .pad = &histo_pad_ops, 413}; 414 415/* ----------------------------------------------------------------------------- 416 * V4L2 ioctls 417 */ 418 419static int histo_v4l2_querycap(struct file *file, void *fh, 420 struct v4l2_capability *cap) 421{ 422 struct v4l2_fh *vfh = file->private_data; 423 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 424 425 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING 426 | V4L2_CAP_VIDEO_CAPTURE_MPLANE 427 | V4L2_CAP_VIDEO_OUTPUT_MPLANE 428 | V4L2_CAP_META_CAPTURE; 429 430 strscpy(cap->driver, "vsp1", sizeof(cap->driver)); 431 strscpy(cap->card, histo->video.name, sizeof(cap->card)); 432 snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s", 433 dev_name(histo->entity.vsp1->dev)); 434 435 return 0; 436} 437 438static int histo_v4l2_enum_format(struct file *file, void *fh, 439 struct v4l2_fmtdesc *f) 440{ 441 struct v4l2_fh *vfh = file->private_data; 442 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 443 444 if (f->index > 0 || f->type != histo->queue.type) 445 return -EINVAL; 446 447 f->pixelformat = histo->meta_format; 448 449 return 0; 450} 451 452static int histo_v4l2_get_format(struct file *file, void *fh, 453 struct v4l2_format *format) 454{ 455 struct v4l2_fh *vfh = file->private_data; 456 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 457 struct v4l2_meta_format *meta = &format->fmt.meta; 458 459 if (format->type != histo->queue.type) 460 return -EINVAL; 461 462 memset(meta, 0, sizeof(*meta)); 463 464 meta->dataformat = histo->meta_format; 465 meta->buffersize = histo->data_size; 466 467 return 0; 468} 469 470static const struct v4l2_ioctl_ops histo_v4l2_ioctl_ops = { 471 .vidioc_querycap = histo_v4l2_querycap, 472 .vidioc_enum_fmt_meta_cap = histo_v4l2_enum_format, 473 .vidioc_g_fmt_meta_cap = histo_v4l2_get_format, 474 .vidioc_s_fmt_meta_cap = histo_v4l2_get_format, 475 .vidioc_try_fmt_meta_cap = histo_v4l2_get_format, 476 .vidioc_reqbufs = vb2_ioctl_reqbufs, 477 .vidioc_querybuf = vb2_ioctl_querybuf, 478 .vidioc_qbuf = vb2_ioctl_qbuf, 479 .vidioc_dqbuf = vb2_ioctl_dqbuf, 480 .vidioc_create_bufs = vb2_ioctl_create_bufs, 481 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 482 .vidioc_streamon = vb2_ioctl_streamon, 483 .vidioc_streamoff = vb2_ioctl_streamoff, 484}; 485 486/* ----------------------------------------------------------------------------- 487 * V4L2 File Operations 488 */ 489 490static const struct v4l2_file_operations histo_v4l2_fops = { 491 .owner = THIS_MODULE, 492 .unlocked_ioctl = video_ioctl2, 493 .open = v4l2_fh_open, 494 .release = vb2_fop_release, 495 .poll = vb2_fop_poll, 496 .mmap = vb2_fop_mmap, 497}; 498 499static void vsp1_histogram_cleanup(struct vsp1_histogram *histo) 500{ 501 if (video_is_registered(&histo->video)) 502 video_unregister_device(&histo->video); 503 504 media_entity_cleanup(&histo->video.entity); 505} 506 507void vsp1_histogram_destroy(struct vsp1_entity *entity) 508{ 509 struct vsp1_histogram *histo = subdev_to_histo(&entity->subdev); 510 511 vsp1_histogram_cleanup(histo); 512} 513 514int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo, 515 enum vsp1_entity_type type, const char *name, 516 const struct vsp1_entity_operations *ops, 517 const unsigned int *formats, unsigned int num_formats, 518 size_t data_size, u32 meta_format) 519{ 520 int ret; 521 522 histo->formats = formats; 523 histo->num_formats = num_formats; 524 histo->data_size = data_size; 525 histo->meta_format = meta_format; 526 527 histo->pad.flags = MEDIA_PAD_FL_SINK; 528 histo->video.vfl_dir = VFL_DIR_RX; 529 530 mutex_init(&histo->lock); 531 spin_lock_init(&histo->irqlock); 532 INIT_LIST_HEAD(&histo->irqqueue); 533 init_waitqueue_head(&histo->wait_queue); 534 535 /* Initialize the VSP entity... */ 536 histo->entity.ops = ops; 537 histo->entity.type = type; 538 539 ret = vsp1_entity_init(vsp1, &histo->entity, name, 2, &histo_ops, 540 MEDIA_ENT_F_PROC_VIDEO_STATISTICS); 541 if (ret < 0) 542 return ret; 543 544 /* ... and the media entity... */ 545 ret = media_entity_pads_init(&histo->video.entity, 1, &histo->pad); 546 if (ret < 0) 547 return ret; 548 549 /* ... and the video node... */ 550 histo->video.v4l2_dev = &vsp1->v4l2_dev; 551 histo->video.fops = &histo_v4l2_fops; 552 snprintf(histo->video.name, sizeof(histo->video.name), 553 "%s histo", histo->entity.subdev.name); 554 histo->video.vfl_type = VFL_TYPE_VIDEO; 555 histo->video.release = video_device_release_empty; 556 histo->video.ioctl_ops = &histo_v4l2_ioctl_ops; 557 histo->video.device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING; 558 559 video_set_drvdata(&histo->video, histo); 560 561 /* ... and the buffers queue... */ 562 histo->queue.type = V4L2_BUF_TYPE_META_CAPTURE; 563 histo->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 564 histo->queue.lock = &histo->lock; 565 histo->queue.drv_priv = histo; 566 histo->queue.buf_struct_size = sizeof(struct vsp1_histogram_buffer); 567 histo->queue.ops = &histo_video_queue_qops; 568 histo->queue.mem_ops = &vb2_vmalloc_memops; 569 histo->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 570 histo->queue.dev = vsp1->dev; 571 ret = vb2_queue_init(&histo->queue); 572 if (ret < 0) { 573 dev_err(vsp1->dev, "failed to initialize vb2 queue\n"); 574 goto error; 575 } 576 577 /* ... and register the video device. */ 578 histo->video.queue = &histo->queue; 579 ret = video_register_device(&histo->video, VFL_TYPE_VIDEO, -1); 580 if (ret < 0) { 581 dev_err(vsp1->dev, "failed to register video device\n"); 582 goto error; 583 } 584 585 return 0; 586 587error: 588 vsp1_histogram_cleanup(histo); 589 return ret; 590} 591