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 = v4l2_subdev_state_get_crop(state, HISTO_PAD_SINK); 222 sel->r.left = 0; 223 sel->r.top = 0; 224 sel->r.width = crop->width; 225 sel->r.height = crop->height; 226 break; 227 228 case V4L2_SEL_TGT_CROP_BOUNDS: 229 case V4L2_SEL_TGT_CROP_DEFAULT: 230 format = v4l2_subdev_state_get_format(state, HISTO_PAD_SINK); 231 sel->r.left = 0; 232 sel->r.top = 0; 233 sel->r.width = format->width; 234 sel->r.height = format->height; 235 break; 236 237 case V4L2_SEL_TGT_COMPOSE: 238 sel->r = *v4l2_subdev_state_get_compose(state, sel->pad); 239 break; 240 241 case V4L2_SEL_TGT_CROP: 242 sel->r = *v4l2_subdev_state_get_crop(state, sel->pad); 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 v4l2_mbus_framefmt *format; 260 261 /* The crop rectangle must be inside the input frame. */ 262 format = v4l2_subdev_state_get_format(sd_state, HISTO_PAD_SINK); 263 sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1); 264 sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1); 265 sel->r.width = clamp_t(unsigned int, sel->r.width, HISTO_MIN_SIZE, 266 format->width - sel->r.left); 267 sel->r.height = clamp_t(unsigned int, sel->r.height, HISTO_MIN_SIZE, 268 format->height - sel->r.top); 269 270 /* Set the crop rectangle and reset the compose rectangle. */ 271 *v4l2_subdev_state_get_crop(sd_state, sel->pad) = sel->r; 272 *v4l2_subdev_state_get_compose(sd_state, sel->pad) = sel->r; 273 274 return 0; 275 } 276 277 static int histo_set_compose(struct v4l2_subdev *subdev, 278 struct v4l2_subdev_state *sd_state, 279 struct v4l2_subdev_selection *sel) 280 { 281 struct v4l2_rect *compose; 282 struct v4l2_rect *crop; 283 unsigned int ratio; 284 285 /* 286 * The compose rectangle is used to configure downscaling, the top left 287 * corner is fixed to (0,0) and the size to 1/2 or 1/4 of the crop 288 * rectangle. 289 */ 290 sel->r.left = 0; 291 sel->r.top = 0; 292 293 crop = v4l2_subdev_state_get_crop(sd_state, sel->pad); 294 295 /* 296 * Clamp the width and height to acceptable values first and then 297 * compute the closest rounded dividing ratio. 298 * 299 * Ratio Rounded ratio 300 * -------------------------- 301 * [1.0 1.5[ 1 302 * [1.5 3.0[ 2 303 * [3.0 4.0] 4 304 * 305 * The rounded ratio can be computed using 306 * 307 * 1 << (ceil(ratio * 2) / 3) 308 */ 309 sel->r.width = clamp(sel->r.width, crop->width / 4, crop->width); 310 ratio = 1 << (crop->width * 2 / sel->r.width / 3); 311 sel->r.width = crop->width / ratio; 312 313 314 sel->r.height = clamp(sel->r.height, crop->height / 4, crop->height); 315 ratio = 1 << (crop->height * 2 / sel->r.height / 3); 316 sel->r.height = crop->height / ratio; 317 318 compose = v4l2_subdev_state_get_compose(sd_state, sel->pad); 319 *compose = sel->r; 320 321 return 0; 322 } 323 324 static int histo_set_selection(struct v4l2_subdev *subdev, 325 struct v4l2_subdev_state *sd_state, 326 struct v4l2_subdev_selection *sel) 327 { 328 struct vsp1_histogram *histo = subdev_to_histo(subdev); 329 struct v4l2_subdev_state *state; 330 int ret; 331 332 if (sel->pad != HISTO_PAD_SINK) 333 return -EINVAL; 334 335 mutex_lock(&histo->entity.lock); 336 337 state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which); 338 if (!state) { 339 ret = -EINVAL; 340 goto done; 341 } 342 343 if (sel->target == V4L2_SEL_TGT_CROP) 344 ret = histo_set_crop(subdev, state, sel); 345 else if (sel->target == V4L2_SEL_TGT_COMPOSE) 346 ret = histo_set_compose(subdev, state, sel); 347 else 348 ret = -EINVAL; 349 350 done: 351 mutex_unlock(&histo->entity.lock); 352 return ret; 353 } 354 355 static int histo_set_format(struct v4l2_subdev *subdev, 356 struct v4l2_subdev_state *sd_state, 357 struct v4l2_subdev_format *fmt) 358 { 359 struct vsp1_histogram *histo = subdev_to_histo(subdev); 360 361 if (fmt->pad == HISTO_PAD_SOURCE) { 362 fmt->format.code = MEDIA_BUS_FMT_FIXED; 363 fmt->format.width = 0; 364 fmt->format.height = 0; 365 fmt->format.field = V4L2_FIELD_NONE; 366 fmt->format.colorspace = V4L2_COLORSPACE_RAW; 367 368 return 0; 369 } 370 371 return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, 372 histo->formats, histo->num_formats, 373 HISTO_MIN_SIZE, HISTO_MIN_SIZE, 374 HISTO_MAX_SIZE, HISTO_MAX_SIZE); 375 } 376 377 static const struct v4l2_subdev_pad_ops histo_pad_ops = { 378 .enum_mbus_code = histo_enum_mbus_code, 379 .enum_frame_size = histo_enum_frame_size, 380 .get_fmt = vsp1_subdev_get_pad_format, 381 .set_fmt = histo_set_format, 382 .get_selection = histo_get_selection, 383 .set_selection = histo_set_selection, 384 }; 385 386 static const struct v4l2_subdev_ops histo_ops = { 387 .pad = &histo_pad_ops, 388 }; 389 390 /* ----------------------------------------------------------------------------- 391 * V4L2 ioctls 392 */ 393 394 static int histo_v4l2_querycap(struct file *file, void *fh, 395 struct v4l2_capability *cap) 396 { 397 struct v4l2_fh *vfh = file->private_data; 398 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 399 400 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING 401 | V4L2_CAP_VIDEO_CAPTURE_MPLANE 402 | V4L2_CAP_VIDEO_OUTPUT_MPLANE 403 | V4L2_CAP_META_CAPTURE; 404 405 strscpy(cap->driver, "vsp1", sizeof(cap->driver)); 406 strscpy(cap->card, histo->video.name, sizeof(cap->card)); 407 408 return 0; 409 } 410 411 static int histo_v4l2_enum_format(struct file *file, void *fh, 412 struct v4l2_fmtdesc *f) 413 { 414 struct v4l2_fh *vfh = file->private_data; 415 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 416 417 if (f->index > 0 || f->type != histo->queue.type) 418 return -EINVAL; 419 420 f->pixelformat = histo->meta_format; 421 422 return 0; 423 } 424 425 static int histo_v4l2_get_format(struct file *file, void *fh, 426 struct v4l2_format *format) 427 { 428 struct v4l2_fh *vfh = file->private_data; 429 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev); 430 struct v4l2_meta_format *meta = &format->fmt.meta; 431 432 if (format->type != histo->queue.type) 433 return -EINVAL; 434 435 memset(meta, 0, sizeof(*meta)); 436 437 meta->dataformat = histo->meta_format; 438 meta->buffersize = histo->data_size; 439 440 return 0; 441 } 442 443 static const struct v4l2_ioctl_ops histo_v4l2_ioctl_ops = { 444 .vidioc_querycap = histo_v4l2_querycap, 445 .vidioc_enum_fmt_meta_cap = histo_v4l2_enum_format, 446 .vidioc_g_fmt_meta_cap = histo_v4l2_get_format, 447 .vidioc_s_fmt_meta_cap = histo_v4l2_get_format, 448 .vidioc_try_fmt_meta_cap = histo_v4l2_get_format, 449 .vidioc_reqbufs = vb2_ioctl_reqbufs, 450 .vidioc_querybuf = vb2_ioctl_querybuf, 451 .vidioc_qbuf = vb2_ioctl_qbuf, 452 .vidioc_dqbuf = vb2_ioctl_dqbuf, 453 .vidioc_create_bufs = vb2_ioctl_create_bufs, 454 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 455 .vidioc_streamon = vb2_ioctl_streamon, 456 .vidioc_streamoff = vb2_ioctl_streamoff, 457 }; 458 459 /* ----------------------------------------------------------------------------- 460 * V4L2 File Operations 461 */ 462 463 static const struct v4l2_file_operations histo_v4l2_fops = { 464 .owner = THIS_MODULE, 465 .unlocked_ioctl = video_ioctl2, 466 .open = v4l2_fh_open, 467 .release = vb2_fop_release, 468 .poll = vb2_fop_poll, 469 .mmap = vb2_fop_mmap, 470 }; 471 472 static void vsp1_histogram_cleanup(struct vsp1_histogram *histo) 473 { 474 if (video_is_registered(&histo->video)) 475 video_unregister_device(&histo->video); 476 477 media_entity_cleanup(&histo->video.entity); 478 } 479 480 void vsp1_histogram_destroy(struct vsp1_entity *entity) 481 { 482 struct vsp1_histogram *histo = subdev_to_histo(&entity->subdev); 483 484 vsp1_histogram_cleanup(histo); 485 } 486 487 int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo, 488 enum vsp1_entity_type type, const char *name, 489 const struct vsp1_entity_operations *ops, 490 const unsigned int *formats, unsigned int num_formats, 491 size_t data_size, u32 meta_format) 492 { 493 int ret; 494 495 histo->formats = formats; 496 histo->num_formats = num_formats; 497 histo->data_size = data_size; 498 histo->meta_format = meta_format; 499 500 histo->pad.flags = MEDIA_PAD_FL_SINK; 501 histo->video.vfl_dir = VFL_DIR_RX; 502 503 mutex_init(&histo->lock); 504 spin_lock_init(&histo->irqlock); 505 INIT_LIST_HEAD(&histo->irqqueue); 506 init_waitqueue_head(&histo->wait_queue); 507 508 /* Initialize the VSP entity... */ 509 histo->entity.ops = ops; 510 histo->entity.type = type; 511 512 ret = vsp1_entity_init(vsp1, &histo->entity, name, 2, &histo_ops, 513 MEDIA_ENT_F_PROC_VIDEO_STATISTICS); 514 if (ret < 0) 515 return ret; 516 517 /* ... and the media entity... */ 518 ret = media_entity_pads_init(&histo->video.entity, 1, &histo->pad); 519 if (ret < 0) 520 return ret; 521 522 /* ... and the video node... */ 523 histo->video.v4l2_dev = &vsp1->v4l2_dev; 524 histo->video.fops = &histo_v4l2_fops; 525 snprintf(histo->video.name, sizeof(histo->video.name), 526 "%s histo", histo->entity.subdev.name); 527 histo->video.vfl_type = VFL_TYPE_VIDEO; 528 histo->video.release = video_device_release_empty; 529 histo->video.ioctl_ops = &histo_v4l2_ioctl_ops; 530 histo->video.device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING; 531 532 video_set_drvdata(&histo->video, histo); 533 534 /* ... and the buffers queue... */ 535 histo->queue.type = V4L2_BUF_TYPE_META_CAPTURE; 536 histo->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 537 histo->queue.lock = &histo->lock; 538 histo->queue.drv_priv = histo; 539 histo->queue.buf_struct_size = sizeof(struct vsp1_histogram_buffer); 540 histo->queue.ops = &histo_video_queue_qops; 541 histo->queue.mem_ops = &vb2_vmalloc_memops; 542 histo->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 543 histo->queue.dev = vsp1->dev; 544 ret = vb2_queue_init(&histo->queue); 545 if (ret < 0) { 546 dev_err(vsp1->dev, "failed to initialize vb2 queue\n"); 547 goto error; 548 } 549 550 /* ... and register the video device. */ 551 histo->video.queue = &histo->queue; 552 ret = video_register_device(&histo->video, VFL_TYPE_VIDEO, -1); 553 if (ret < 0) { 554 dev_err(vsp1->dev, "failed to register video device\n"); 555 goto error; 556 } 557 558 return 0; 559 560 error: 561 vsp1_histogram_cleanup(histo); 562 return ret; 563 } 564