1/* 2 * A virtual v4l2-mem2mem example device. 3 * 4 * This is a virtual device driver for testing mem-to-mem videobuf framework. 5 * It simulates a device that uses memory buffers for both source and 6 * destination, processes the data and issues an "irq" (simulated by a timer). 7 * The device is capable of multi-instance, multi-buffer-per-transaction 8 * operation (via the mem2mem framework). 9 * 10 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd. 11 * Pawel Osciak, <pawel@osciak.com> 12 * Marek Szyprowski, <m.szyprowski@samsung.com> 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by the 16 * Free Software Foundation; either version 2 of the 17 * License, or (at your option) any later version 18 */ 19#include <linux/module.h> 20#include <linux/delay.h> 21#include <linux/fs.h> 22#include <linux/timer.h> 23#include <linux/sched.h> 24#include <linux/slab.h> 25 26#include <linux/platform_device.h> 27#include <media/v4l2-mem2mem.h> 28#include <media/v4l2-device.h> 29#include <media/v4l2-ioctl.h> 30#include <media/videobuf2-vmalloc.h> 31 32#define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev" 33 34MODULE_DESCRIPTION("Virtual device for mem2mem framework testing"); 35MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); 36MODULE_LICENSE("GPL"); 37MODULE_VERSION("0.1.1"); 38 39#define MIN_W 32 40#define MIN_H 32 41#define MAX_W 640 42#define MAX_H 480 43#define DIM_ALIGN_MASK 0x08 /* 8-alignment for dimensions */ 44 45/* Flags that indicate a format can be used for capture/output */ 46#define MEM2MEM_CAPTURE (1 << 0) 47#define MEM2MEM_OUTPUT (1 << 1) 48 49#define MEM2MEM_NAME "m2m-testdev" 50 51/* Per queue */ 52#define MEM2MEM_DEF_NUM_BUFS VIDEO_MAX_FRAME 53/* In bytes, per queue */ 54#define MEM2MEM_VID_MEM_LIMIT (16 * 1024 * 1024) 55 56/* Default transaction time in msec */ 57#define MEM2MEM_DEF_TRANSTIME 1000 58/* Default number of buffers per transaction */ 59#define MEM2MEM_DEF_TRANSLEN 1 60#define MEM2MEM_COLOR_STEP (0xff >> 4) 61#define MEM2MEM_NUM_TILES 8 62 63#define dprintk(dev, fmt, arg...) \ 64 v4l2_dbg(1, 1, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg) 65 66 67void m2mtest_dev_release(struct device *dev) 68{} 69 70static struct platform_device m2mtest_pdev = { 71 .name = MEM2MEM_NAME, 72 .dev.release = m2mtest_dev_release, 73}; 74 75struct m2mtest_fmt { 76 char *name; 77 u32 fourcc; 78 int depth; 79 /* Types the format can be used for */ 80 u32 types; 81}; 82 83static struct m2mtest_fmt formats[] = { 84 { 85 .name = "RGB565 (BE)", 86 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */ 87 .depth = 16, 88 /* Both capture and output format */ 89 .types = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT, 90 }, 91 { 92 .name = "4:2:2, packed, YUYV", 93 .fourcc = V4L2_PIX_FMT_YUYV, 94 .depth = 16, 95 /* Output-only format */ 96 .types = MEM2MEM_OUTPUT, 97 }, 98}; 99 100/* Per-queue, driver-specific private data */ 101struct m2mtest_q_data { 102 unsigned int width; 103 unsigned int height; 104 unsigned int sizeimage; 105 struct m2mtest_fmt *fmt; 106}; 107 108enum { 109 V4L2_M2M_SRC = 0, 110 V4L2_M2M_DST = 1, 111}; 112 113/* Source and destination queue data */ 114static struct m2mtest_q_data q_data[2]; 115 116static struct m2mtest_q_data *get_q_data(enum v4l2_buf_type type) 117{ 118 switch (type) { 119 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 120 return &q_data[V4L2_M2M_SRC]; 121 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 122 return &q_data[V4L2_M2M_DST]; 123 default: 124 BUG(); 125 } 126 return NULL; 127} 128 129#define V4L2_CID_TRANS_TIME_MSEC V4L2_CID_PRIVATE_BASE 130#define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_PRIVATE_BASE + 1) 131 132static struct v4l2_queryctrl m2mtest_ctrls[] = { 133 { 134 .id = V4L2_CID_TRANS_TIME_MSEC, 135 .type = V4L2_CTRL_TYPE_INTEGER, 136 .name = "Transaction time (msec)", 137 .minimum = 1, 138 .maximum = 10000, 139 .step = 100, 140 .default_value = 1000, 141 .flags = 0, 142 }, { 143 .id = V4L2_CID_TRANS_NUM_BUFS, 144 .type = V4L2_CTRL_TYPE_INTEGER, 145 .name = "Buffers per transaction", 146 .minimum = 1, 147 .maximum = MEM2MEM_DEF_NUM_BUFS, 148 .step = 1, 149 .default_value = 1, 150 .flags = 0, 151 }, 152}; 153 154#define NUM_FORMATS ARRAY_SIZE(formats) 155 156static struct m2mtest_fmt *find_format(struct v4l2_format *f) 157{ 158 struct m2mtest_fmt *fmt; 159 unsigned int k; 160 161 for (k = 0; k < NUM_FORMATS; k++) { 162 fmt = &formats[k]; 163 if (fmt->fourcc == f->fmt.pix.pixelformat) 164 break; 165 } 166 167 if (k == NUM_FORMATS) 168 return NULL; 169 170 return &formats[k]; 171} 172 173struct m2mtest_dev { 174 struct v4l2_device v4l2_dev; 175 struct video_device *vfd; 176 177 atomic_t num_inst; 178 struct mutex dev_mutex; 179 spinlock_t irqlock; 180 181 struct timer_list timer; 182 183 struct v4l2_m2m_dev *m2m_dev; 184}; 185 186struct m2mtest_ctx { 187 struct m2mtest_dev *dev; 188 189 /* Processed buffers in this transaction */ 190 u8 num_processed; 191 192 /* Transaction length (i.e. how many buffers per transaction) */ 193 u32 translen; 194 /* Transaction time (i.e. simulated processing time) in milliseconds */ 195 u32 transtime; 196 197 /* Abort requested by m2m */ 198 int aborting; 199 200 struct v4l2_m2m_ctx *m2m_ctx; 201}; 202 203static struct v4l2_queryctrl *get_ctrl(int id) 204{ 205 int i; 206 207 for (i = 0; i < ARRAY_SIZE(m2mtest_ctrls); ++i) { 208 if (id == m2mtest_ctrls[i].id) 209 return &m2mtest_ctrls[i]; 210 } 211 212 return NULL; 213} 214 215static int device_process(struct m2mtest_ctx *ctx, 216 struct vb2_buffer *in_vb, 217 struct vb2_buffer *out_vb) 218{ 219 struct m2mtest_dev *dev = ctx->dev; 220 struct m2mtest_q_data *q_data; 221 u8 *p_in, *p_out; 222 int x, y, t, w; 223 int tile_w, bytes_left; 224 int width, height, bytesperline; 225 226 q_data = get_q_data(V4L2_BUF_TYPE_VIDEO_OUTPUT); 227 228 width = q_data->width; 229 height = q_data->height; 230 bytesperline = (q_data->width * q_data->fmt->depth) >> 3; 231 232 p_in = vb2_plane_vaddr(in_vb, 0); 233 p_out = vb2_plane_vaddr(out_vb, 0); 234 if (!p_in || !p_out) { 235 v4l2_err(&dev->v4l2_dev, 236 "Acquiring kernel pointers to buffers failed\n"); 237 return -EFAULT; 238 } 239 240 if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) { 241 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n"); 242 return -EINVAL; 243 } 244 245 tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3)) 246 / MEM2MEM_NUM_TILES; 247 bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES; 248 w = 0; 249 250 for (y = 0; y < height; ++y) { 251 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 252 if (w & 0x1) { 253 for (x = 0; x < tile_w; ++x) 254 *p_out++ = *p_in++ + MEM2MEM_COLOR_STEP; 255 } else { 256 for (x = 0; x < tile_w; ++x) 257 *p_out++ = *p_in++ - MEM2MEM_COLOR_STEP; 258 } 259 ++w; 260 } 261 p_in += bytes_left; 262 p_out += bytes_left; 263 } 264 265 return 0; 266} 267 268static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout) 269{ 270 dprintk(dev, "Scheduling a simulated irq\n"); 271 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout)); 272} 273 274/* 275 * mem2mem callbacks 276 */ 277 278/** 279 * job_ready() - check whether an instance is ready to be scheduled to run 280 */ 281static int job_ready(void *priv) 282{ 283 struct m2mtest_ctx *ctx = priv; 284 285 if (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) < ctx->translen 286 || v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx) < ctx->translen) { 287 dprintk(ctx->dev, "Not enough buffers available\n"); 288 return 0; 289 } 290 291 return 1; 292} 293 294static void job_abort(void *priv) 295{ 296 struct m2mtest_ctx *ctx = priv; 297 298 /* Will cancel the transaction in the next interrupt handler */ 299 ctx->aborting = 1; 300} 301 302static void m2mtest_lock(void *priv) 303{ 304 struct m2mtest_ctx *ctx = priv; 305 struct m2mtest_dev *dev = ctx->dev; 306 mutex_lock(&dev->dev_mutex); 307} 308 309static void m2mtest_unlock(void *priv) 310{ 311 struct m2mtest_ctx *ctx = priv; 312 struct m2mtest_dev *dev = ctx->dev; 313 mutex_unlock(&dev->dev_mutex); 314} 315 316 317/* device_run() - prepares and starts the device 318 * 319 * This simulates all the immediate preparations required before starting 320 * a device. This will be called by the framework when it decides to schedule 321 * a particular instance. 322 */ 323static void device_run(void *priv) 324{ 325 struct m2mtest_ctx *ctx = priv; 326 struct m2mtest_dev *dev = ctx->dev; 327 struct vb2_buffer *src_buf, *dst_buf; 328 329 src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx); 330 dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx); 331 332 device_process(ctx, src_buf, dst_buf); 333 334 /* Run a timer, which simulates a hardware irq */ 335 schedule_irq(dev, ctx->transtime); 336} 337 338static void device_isr(unsigned long priv) 339{ 340 struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv; 341 struct m2mtest_ctx *curr_ctx; 342 struct vb2_buffer *src_vb, *dst_vb; 343 unsigned long flags; 344 345 curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev); 346 347 if (NULL == curr_ctx) { 348 printk(KERN_ERR 349 "Instance released before the end of transaction\n"); 350 return; 351 } 352 353 src_vb = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx); 354 dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx); 355 356 curr_ctx->num_processed++; 357 358 spin_lock_irqsave(&m2mtest_dev->irqlock, flags); 359 v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE); 360 v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE); 361 spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags); 362 363 if (curr_ctx->num_processed == curr_ctx->translen 364 || curr_ctx->aborting) { 365 dprintk(curr_ctx->dev, "Finishing transaction\n"); 366 curr_ctx->num_processed = 0; 367 v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx); 368 } else { 369 device_run(curr_ctx); 370 } 371} 372 373/* 374 * video ioctls 375 */ 376static int vidioc_querycap(struct file *file, void *priv, 377 struct v4l2_capability *cap) 378{ 379 strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1); 380 strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1); 381 cap->bus_info[0] = 0; 382 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT 383 | V4L2_CAP_STREAMING; 384 385 return 0; 386} 387 388static int enum_fmt(struct v4l2_fmtdesc *f, u32 type) 389{ 390 int i, num; 391 struct m2mtest_fmt *fmt; 392 393 num = 0; 394 395 for (i = 0; i < NUM_FORMATS; ++i) { 396 if (formats[i].types & type) { 397 /* index-th format of type type found ? */ 398 if (num == f->index) 399 break; 400 /* Correct type but haven't reached our index yet, 401 * just increment per-type index */ 402 ++num; 403 } 404 } 405 406 if (i < NUM_FORMATS) { 407 /* Format found */ 408 fmt = &formats[i]; 409 strncpy(f->description, fmt->name, sizeof(f->description) - 1); 410 f->pixelformat = fmt->fourcc; 411 return 0; 412 } 413 414 /* Format not found */ 415 return -EINVAL; 416} 417 418static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 419 struct v4l2_fmtdesc *f) 420{ 421 return enum_fmt(f, MEM2MEM_CAPTURE); 422} 423 424static int vidioc_enum_fmt_vid_out(struct file *file, void *priv, 425 struct v4l2_fmtdesc *f) 426{ 427 return enum_fmt(f, MEM2MEM_OUTPUT); 428} 429 430static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f) 431{ 432 struct vb2_queue *vq; 433 struct m2mtest_q_data *q_data; 434 435 vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type); 436 if (!vq) 437 return -EINVAL; 438 439 q_data = get_q_data(f->type); 440 441 f->fmt.pix.width = q_data->width; 442 f->fmt.pix.height = q_data->height; 443 f->fmt.pix.field = V4L2_FIELD_NONE; 444 f->fmt.pix.pixelformat = q_data->fmt->fourcc; 445 f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3; 446 f->fmt.pix.sizeimage = q_data->sizeimage; 447 448 return 0; 449} 450 451static int vidioc_g_fmt_vid_out(struct file *file, void *priv, 452 struct v4l2_format *f) 453{ 454 return vidioc_g_fmt(priv, f); 455} 456 457static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 458 struct v4l2_format *f) 459{ 460 return vidioc_g_fmt(priv, f); 461} 462 463static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt) 464{ 465 enum v4l2_field field; 466 467 field = f->fmt.pix.field; 468 469 if (field == V4L2_FIELD_ANY) 470 field = V4L2_FIELD_NONE; 471 else if (V4L2_FIELD_NONE != field) 472 return -EINVAL; 473 474 /* V4L2 specification suggests the driver corrects the format struct 475 * if any of the dimensions is unsupported */ 476 f->fmt.pix.field = field; 477 478 if (f->fmt.pix.height < MIN_H) 479 f->fmt.pix.height = MIN_H; 480 else if (f->fmt.pix.height > MAX_H) 481 f->fmt.pix.height = MAX_H; 482 483 if (f->fmt.pix.width < MIN_W) 484 f->fmt.pix.width = MIN_W; 485 else if (f->fmt.pix.width > MAX_W) 486 f->fmt.pix.width = MAX_W; 487 488 f->fmt.pix.width &= ~DIM_ALIGN_MASK; 489 f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3; 490 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 491 492 return 0; 493} 494 495static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 496 struct v4l2_format *f) 497{ 498 struct m2mtest_fmt *fmt; 499 struct m2mtest_ctx *ctx = priv; 500 501 fmt = find_format(f); 502 if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) { 503 v4l2_err(&ctx->dev->v4l2_dev, 504 "Fourcc format (0x%08x) invalid.\n", 505 f->fmt.pix.pixelformat); 506 return -EINVAL; 507 } 508 509 return vidioc_try_fmt(f, fmt); 510} 511 512static int vidioc_try_fmt_vid_out(struct file *file, void *priv, 513 struct v4l2_format *f) 514{ 515 struct m2mtest_fmt *fmt; 516 struct m2mtest_ctx *ctx = priv; 517 518 fmt = find_format(f); 519 if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) { 520 v4l2_err(&ctx->dev->v4l2_dev, 521 "Fourcc format (0x%08x) invalid.\n", 522 f->fmt.pix.pixelformat); 523 return -EINVAL; 524 } 525 526 return vidioc_try_fmt(f, fmt); 527} 528 529static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f) 530{ 531 struct m2mtest_q_data *q_data; 532 struct vb2_queue *vq; 533 534 vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type); 535 if (!vq) 536 return -EINVAL; 537 538 q_data = get_q_data(f->type); 539 if (!q_data) 540 return -EINVAL; 541 542 if (vb2_is_busy(vq)) { 543 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__); 544 return -EBUSY; 545 } 546 547 q_data->fmt = find_format(f); 548 q_data->width = f->fmt.pix.width; 549 q_data->height = f->fmt.pix.height; 550 q_data->sizeimage = q_data->width * q_data->height 551 * q_data->fmt->depth >> 3; 552 553 dprintk(ctx->dev, 554 "Setting format for type %d, wxh: %dx%d, fmt: %d\n", 555 f->type, q_data->width, q_data->height, q_data->fmt->fourcc); 556 557 return 0; 558} 559 560static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 561 struct v4l2_format *f) 562{ 563 int ret; 564 565 ret = vidioc_try_fmt_vid_cap(file, priv, f); 566 if (ret) 567 return ret; 568 569 return vidioc_s_fmt(priv, f); 570} 571 572static int vidioc_s_fmt_vid_out(struct file *file, void *priv, 573 struct v4l2_format *f) 574{ 575 int ret; 576 577 ret = vidioc_try_fmt_vid_out(file, priv, f); 578 if (ret) 579 return ret; 580 581 return vidioc_s_fmt(priv, f); 582} 583 584static int vidioc_reqbufs(struct file *file, void *priv, 585 struct v4l2_requestbuffers *reqbufs) 586{ 587 struct m2mtest_ctx *ctx = priv; 588 589 return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs); 590} 591 592static int vidioc_querybuf(struct file *file, void *priv, 593 struct v4l2_buffer *buf) 594{ 595 struct m2mtest_ctx *ctx = priv; 596 597 return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf); 598} 599 600static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf) 601{ 602 struct m2mtest_ctx *ctx = priv; 603 604 return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf); 605} 606 607static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf) 608{ 609 struct m2mtest_ctx *ctx = priv; 610 611 return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf); 612} 613 614static int vidioc_streamon(struct file *file, void *priv, 615 enum v4l2_buf_type type) 616{ 617 struct m2mtest_ctx *ctx = priv; 618 619 return v4l2_m2m_streamon(file, ctx->m2m_ctx, type); 620} 621 622static int vidioc_streamoff(struct file *file, void *priv, 623 enum v4l2_buf_type type) 624{ 625 struct m2mtest_ctx *ctx = priv; 626 627 return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type); 628} 629 630static int vidioc_queryctrl(struct file *file, void *priv, 631 struct v4l2_queryctrl *qc) 632{ 633 struct v4l2_queryctrl *c; 634 635 c = get_ctrl(qc->id); 636 if (!c) 637 return -EINVAL; 638 639 *qc = *c; 640 return 0; 641} 642 643static int vidioc_g_ctrl(struct file *file, void *priv, 644 struct v4l2_control *ctrl) 645{ 646 struct m2mtest_ctx *ctx = priv; 647 648 switch (ctrl->id) { 649 case V4L2_CID_TRANS_TIME_MSEC: 650 ctrl->value = ctx->transtime; 651 break; 652 653 case V4L2_CID_TRANS_NUM_BUFS: 654 ctrl->value = ctx->translen; 655 break; 656 657 default: 658 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n"); 659 return -EINVAL; 660 } 661 662 return 0; 663} 664 665static int check_ctrl_val(struct m2mtest_ctx *ctx, struct v4l2_control *ctrl) 666{ 667 struct v4l2_queryctrl *c; 668 669 c = get_ctrl(ctrl->id); 670 if (!c) 671 return -EINVAL; 672 673 if (ctrl->value < c->minimum || ctrl->value > c->maximum) { 674 v4l2_err(&ctx->dev->v4l2_dev, "Value out of range\n"); 675 return -ERANGE; 676 } 677 678 return 0; 679} 680 681static int vidioc_s_ctrl(struct file *file, void *priv, 682 struct v4l2_control *ctrl) 683{ 684 struct m2mtest_ctx *ctx = priv; 685 int ret = 0; 686 687 ret = check_ctrl_val(ctx, ctrl); 688 if (ret != 0) 689 return ret; 690 691 switch (ctrl->id) { 692 case V4L2_CID_TRANS_TIME_MSEC: 693 ctx->transtime = ctrl->value; 694 break; 695 696 case V4L2_CID_TRANS_NUM_BUFS: 697 ctx->translen = ctrl->value; 698 break; 699 700 default: 701 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n"); 702 return -EINVAL; 703 } 704 705 return 0; 706} 707 708 709static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = { 710 .vidioc_querycap = vidioc_querycap, 711 712 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 713 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 714 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 715 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 716 717 .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out, 718 .vidioc_g_fmt_vid_out = vidioc_g_fmt_vid_out, 719 .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out, 720 .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out, 721 722 .vidioc_reqbufs = vidioc_reqbufs, 723 .vidioc_querybuf = vidioc_querybuf, 724 725 .vidioc_qbuf = vidioc_qbuf, 726 .vidioc_dqbuf = vidioc_dqbuf, 727 728 .vidioc_streamon = vidioc_streamon, 729 .vidioc_streamoff = vidioc_streamoff, 730 731 .vidioc_queryctrl = vidioc_queryctrl, 732 .vidioc_g_ctrl = vidioc_g_ctrl, 733 .vidioc_s_ctrl = vidioc_s_ctrl, 734}; 735 736 737/* 738 * Queue operations 739 */ 740 741static int m2mtest_queue_setup(struct vb2_queue *vq, 742 const struct v4l2_format *fmt, 743 unsigned int *nbuffers, unsigned int *nplanes, 744 unsigned int sizes[], void *alloc_ctxs[]) 745{ 746 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq); 747 struct m2mtest_q_data *q_data; 748 unsigned int size, count = *nbuffers; 749 750 q_data = get_q_data(vq->type); 751 752 size = q_data->width * q_data->height * q_data->fmt->depth >> 3; 753 754 while (size * count > MEM2MEM_VID_MEM_LIMIT) 755 (count)--; 756 757 *nplanes = 1; 758 *nbuffers = count; 759 sizes[0] = size; 760 761 /* 762 * videobuf2-vmalloc allocator is context-less so no need to set 763 * alloc_ctxs array. 764 */ 765 766 dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size); 767 768 return 0; 769} 770 771static int m2mtest_buf_prepare(struct vb2_buffer *vb) 772{ 773 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 774 struct m2mtest_q_data *q_data; 775 776 dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type); 777 778 q_data = get_q_data(vb->vb2_queue->type); 779 780 if (vb2_plane_size(vb, 0) < q_data->sizeimage) { 781 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n", 782 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage); 783 return -EINVAL; 784 } 785 786 vb2_set_plane_payload(vb, 0, q_data->sizeimage); 787 788 return 0; 789} 790 791static void m2mtest_buf_queue(struct vb2_buffer *vb) 792{ 793 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 794 v4l2_m2m_buf_queue(ctx->m2m_ctx, vb); 795} 796 797static void m2mtest_wait_prepare(struct vb2_queue *q) 798{ 799 struct m2mtest_ctx *ctx = vb2_get_drv_priv(q); 800 m2mtest_unlock(ctx); 801} 802 803static void m2mtest_wait_finish(struct vb2_queue *q) 804{ 805 struct m2mtest_ctx *ctx = vb2_get_drv_priv(q); 806 m2mtest_lock(ctx); 807} 808 809static struct vb2_ops m2mtest_qops = { 810 .queue_setup = m2mtest_queue_setup, 811 .buf_prepare = m2mtest_buf_prepare, 812 .buf_queue = m2mtest_buf_queue, 813 .wait_prepare = m2mtest_wait_prepare, 814 .wait_finish = m2mtest_wait_finish, 815}; 816 817static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq) 818{ 819 struct m2mtest_ctx *ctx = priv; 820 int ret; 821 822 memset(src_vq, 0, sizeof(*src_vq)); 823 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; 824 src_vq->io_modes = VB2_MMAP; 825 src_vq->drv_priv = ctx; 826 src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 827 src_vq->ops = &m2mtest_qops; 828 src_vq->mem_ops = &vb2_vmalloc_memops; 829 830 ret = vb2_queue_init(src_vq); 831 if (ret) 832 return ret; 833 834 memset(dst_vq, 0, sizeof(*dst_vq)); 835 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 836 dst_vq->io_modes = VB2_MMAP; 837 dst_vq->drv_priv = ctx; 838 dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 839 dst_vq->ops = &m2mtest_qops; 840 dst_vq->mem_ops = &vb2_vmalloc_memops; 841 842 return vb2_queue_init(dst_vq); 843} 844 845/* 846 * File operations 847 */ 848static int m2mtest_open(struct file *file) 849{ 850 struct m2mtest_dev *dev = video_drvdata(file); 851 struct m2mtest_ctx *ctx = NULL; 852 853 ctx = kzalloc(sizeof *ctx, GFP_KERNEL); 854 if (!ctx) 855 return -ENOMEM; 856 857 file->private_data = ctx; 858 ctx->dev = dev; 859 ctx->translen = MEM2MEM_DEF_TRANSLEN; 860 ctx->transtime = MEM2MEM_DEF_TRANSTIME; 861 ctx->num_processed = 0; 862 863 ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init); 864 865 if (IS_ERR(ctx->m2m_ctx)) { 866 int ret = PTR_ERR(ctx->m2m_ctx); 867 868 kfree(ctx); 869 return ret; 870 } 871 872 atomic_inc(&dev->num_inst); 873 874 dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx); 875 876 return 0; 877} 878 879static int m2mtest_release(struct file *file) 880{ 881 struct m2mtest_dev *dev = video_drvdata(file); 882 struct m2mtest_ctx *ctx = file->private_data; 883 884 dprintk(dev, "Releasing instance %p\n", ctx); 885 886 v4l2_m2m_ctx_release(ctx->m2m_ctx); 887 kfree(ctx); 888 889 atomic_dec(&dev->num_inst); 890 891 return 0; 892} 893 894static unsigned int m2mtest_poll(struct file *file, 895 struct poll_table_struct *wait) 896{ 897 struct m2mtest_ctx *ctx = file->private_data; 898 899 return v4l2_m2m_poll(file, ctx->m2m_ctx, wait); 900} 901 902static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma) 903{ 904 struct m2mtest_ctx *ctx = file->private_data; 905 906 return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma); 907} 908 909static const struct v4l2_file_operations m2mtest_fops = { 910 .owner = THIS_MODULE, 911 .open = m2mtest_open, 912 .release = m2mtest_release, 913 .poll = m2mtest_poll, 914 .unlocked_ioctl = video_ioctl2, 915 .mmap = m2mtest_mmap, 916}; 917 918static struct video_device m2mtest_videodev = { 919 .name = MEM2MEM_NAME, 920 .fops = &m2mtest_fops, 921 .ioctl_ops = &m2mtest_ioctl_ops, 922 .minor = -1, 923 .release = video_device_release, 924}; 925 926static struct v4l2_m2m_ops m2m_ops = { 927 .device_run = device_run, 928 .job_ready = job_ready, 929 .job_abort = job_abort, 930 .lock = m2mtest_lock, 931 .unlock = m2mtest_unlock, 932}; 933 934static int m2mtest_probe(struct platform_device *pdev) 935{ 936 struct m2mtest_dev *dev; 937 struct video_device *vfd; 938 int ret; 939 940 dev = kzalloc(sizeof *dev, GFP_KERNEL); 941 if (!dev) 942 return -ENOMEM; 943 944 spin_lock_init(&dev->irqlock); 945 946 ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev); 947 if (ret) 948 goto free_dev; 949 950 atomic_set(&dev->num_inst, 0); 951 mutex_init(&dev->dev_mutex); 952 953 vfd = video_device_alloc(); 954 if (!vfd) { 955 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n"); 956 ret = -ENOMEM; 957 goto unreg_dev; 958 } 959 960 *vfd = m2mtest_videodev; 961 vfd->lock = &dev->dev_mutex; 962 963 ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); 964 if (ret) { 965 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); 966 goto rel_vdev; 967 } 968 969 video_set_drvdata(vfd, dev); 970 snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name); 971 dev->vfd = vfd; 972 v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME 973 "Device registered as /dev/video%d\n", vfd->num); 974 975 setup_timer(&dev->timer, device_isr, (long)dev); 976 platform_set_drvdata(pdev, dev); 977 978 dev->m2m_dev = v4l2_m2m_init(&m2m_ops); 979 if (IS_ERR(dev->m2m_dev)) { 980 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n"); 981 ret = PTR_ERR(dev->m2m_dev); 982 goto err_m2m; 983 } 984 985 q_data[V4L2_M2M_SRC].fmt = &formats[0]; 986 q_data[V4L2_M2M_DST].fmt = &formats[0]; 987 988 return 0; 989 990 v4l2_m2m_release(dev->m2m_dev); 991err_m2m: 992 video_unregister_device(dev->vfd); 993rel_vdev: 994 video_device_release(vfd); 995unreg_dev: 996 v4l2_device_unregister(&dev->v4l2_dev); 997free_dev: 998 kfree(dev); 999 1000 return ret; 1001} 1002 1003static int m2mtest_remove(struct platform_device *pdev) 1004{ 1005 struct m2mtest_dev *dev = 1006 (struct m2mtest_dev *)platform_get_drvdata(pdev); 1007 1008 v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME); 1009 v4l2_m2m_release(dev->m2m_dev); 1010 del_timer_sync(&dev->timer); 1011 video_unregister_device(dev->vfd); 1012 v4l2_device_unregister(&dev->v4l2_dev); 1013 kfree(dev); 1014 1015 return 0; 1016} 1017 1018static struct platform_driver m2mtest_pdrv = { 1019 .probe = m2mtest_probe, 1020 .remove = m2mtest_remove, 1021 .driver = { 1022 .name = MEM2MEM_NAME, 1023 .owner = THIS_MODULE, 1024 }, 1025}; 1026 1027static void __exit m2mtest_exit(void) 1028{ 1029 platform_driver_unregister(&m2mtest_pdrv); 1030 platform_device_unregister(&m2mtest_pdev); 1031} 1032 1033static int __init m2mtest_init(void) 1034{ 1035 int ret; 1036 1037 ret = platform_device_register(&m2mtest_pdev); 1038 if (ret) 1039 return ret; 1040 1041 ret = platform_driver_register(&m2mtest_pdrv); 1042 if (ret) 1043 platform_device_unregister(&m2mtest_pdev); 1044 1045 return 0; 1046} 1047 1048module_init(m2mtest_init); 1049module_exit(m2mtest_exit); 1050 1051