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/v4l2-ctrls.h> 31#include <media/v4l2-event.h> 32#include <media/videobuf2-vmalloc.h> 33 34#define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev" 35 36MODULE_DESCRIPTION("Virtual device for mem2mem framework testing"); 37MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); 38MODULE_LICENSE("GPL"); 39MODULE_VERSION("0.1.1"); 40 41static unsigned debug; 42module_param(debug, uint, 0644); 43MODULE_PARM_DESC(debug, "activates debug info"); 44 45#define MIN_W 32 46#define MIN_H 32 47#define MAX_W 640 48#define MAX_H 480 49#define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */ 50 51/* Flags that indicate a format can be used for capture/output */ 52#define MEM2MEM_CAPTURE (1 << 0) 53#define MEM2MEM_OUTPUT (1 << 1) 54 55#define MEM2MEM_NAME "m2m-testdev" 56 57/* Per queue */ 58#define MEM2MEM_DEF_NUM_BUFS VIDEO_MAX_FRAME 59/* In bytes, per queue */ 60#define MEM2MEM_VID_MEM_LIMIT (16 * 1024 * 1024) 61 62/* Default transaction time in msec */ 63#define MEM2MEM_DEF_TRANSTIME 40 64#define MEM2MEM_COLOR_STEP (0xff >> 4) 65#define MEM2MEM_NUM_TILES 8 66 67/* Flags that indicate processing mode */ 68#define MEM2MEM_HFLIP (1 << 0) 69#define MEM2MEM_VFLIP (1 << 1) 70 71#define dprintk(dev, fmt, arg...) \ 72 v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg) 73 74 75static void m2mtest_dev_release(struct device *dev) 76{} 77 78static struct platform_device m2mtest_pdev = { 79 .name = MEM2MEM_NAME, 80 .dev.release = m2mtest_dev_release, 81}; 82 83struct m2mtest_fmt { 84 char *name; 85 u32 fourcc; 86 int depth; 87 /* Types the format can be used for */ 88 u32 types; 89}; 90 91static struct m2mtest_fmt formats[] = { 92 { 93 .name = "RGB565 (BE)", 94 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */ 95 .depth = 16, 96 /* Both capture and output format */ 97 .types = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT, 98 }, 99 { 100 .name = "4:2:2, packed, YUYV", 101 .fourcc = V4L2_PIX_FMT_YUYV, 102 .depth = 16, 103 /* Output-only format */ 104 .types = MEM2MEM_OUTPUT, 105 }, 106}; 107 108#define NUM_FORMATS ARRAY_SIZE(formats) 109 110/* Per-queue, driver-specific private data */ 111struct m2mtest_q_data { 112 unsigned int width; 113 unsigned int height; 114 unsigned int sizeimage; 115 unsigned int sequence; 116 struct m2mtest_fmt *fmt; 117}; 118 119enum { 120 V4L2_M2M_SRC = 0, 121 V4L2_M2M_DST = 1, 122}; 123 124#define V4L2_CID_TRANS_TIME_MSEC (V4L2_CID_USER_BASE + 0x1000) 125#define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_USER_BASE + 0x1001) 126 127static struct m2mtest_fmt *find_format(struct v4l2_format *f) 128{ 129 struct m2mtest_fmt *fmt; 130 unsigned int k; 131 132 for (k = 0; k < NUM_FORMATS; k++) { 133 fmt = &formats[k]; 134 if (fmt->fourcc == f->fmt.pix.pixelformat) 135 break; 136 } 137 138 if (k == NUM_FORMATS) 139 return NULL; 140 141 return &formats[k]; 142} 143 144struct m2mtest_dev { 145 struct v4l2_device v4l2_dev; 146 struct video_device *vfd; 147 148 atomic_t num_inst; 149 struct mutex dev_mutex; 150 spinlock_t irqlock; 151 152 struct timer_list timer; 153 154 struct v4l2_m2m_dev *m2m_dev; 155}; 156 157struct m2mtest_ctx { 158 struct v4l2_fh fh; 159 struct m2mtest_dev *dev; 160 161 struct v4l2_ctrl_handler hdl; 162 163 /* Processed buffers in this transaction */ 164 u8 num_processed; 165 166 /* Transaction length (i.e. how many buffers per transaction) */ 167 u32 translen; 168 /* Transaction time (i.e. simulated processing time) in milliseconds */ 169 u32 transtime; 170 171 /* Abort requested by m2m */ 172 int aborting; 173 174 /* Processing mode */ 175 int mode; 176 177 enum v4l2_colorspace colorspace; 178 179 /* Source and destination queue data */ 180 struct m2mtest_q_data q_data[2]; 181}; 182 183static inline struct m2mtest_ctx *file2ctx(struct file *file) 184{ 185 return container_of(file->private_data, struct m2mtest_ctx, fh); 186} 187 188static struct m2mtest_q_data *get_q_data(struct m2mtest_ctx *ctx, 189 enum v4l2_buf_type type) 190{ 191 switch (type) { 192 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 193 return &ctx->q_data[V4L2_M2M_SRC]; 194 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 195 return &ctx->q_data[V4L2_M2M_DST]; 196 default: 197 BUG(); 198 } 199 return NULL; 200} 201 202 203static int device_process(struct m2mtest_ctx *ctx, 204 struct vb2_buffer *in_vb, 205 struct vb2_buffer *out_vb) 206{ 207 struct m2mtest_dev *dev = ctx->dev; 208 struct m2mtest_q_data *q_data; 209 u8 *p_in, *p_out; 210 int x, y, t, w; 211 int tile_w, bytes_left; 212 int width, height, bytesperline; 213 214 q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); 215 216 width = q_data->width; 217 height = q_data->height; 218 bytesperline = (q_data->width * q_data->fmt->depth) >> 3; 219 220 p_in = vb2_plane_vaddr(in_vb, 0); 221 p_out = vb2_plane_vaddr(out_vb, 0); 222 if (!p_in || !p_out) { 223 v4l2_err(&dev->v4l2_dev, 224 "Acquiring kernel pointers to buffers failed\n"); 225 return -EFAULT; 226 } 227 228 if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) { 229 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n"); 230 return -EINVAL; 231 } 232 233 tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3)) 234 / MEM2MEM_NUM_TILES; 235 bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES; 236 w = 0; 237 238 out_vb->v4l2_buf.sequence = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE)->sequence++; 239 in_vb->v4l2_buf.sequence = q_data->sequence++; 240 memcpy(&out_vb->v4l2_buf.timestamp, 241 &in_vb->v4l2_buf.timestamp, 242 sizeof(struct timeval)); 243 if (in_vb->v4l2_buf.flags & V4L2_BUF_FLAG_TIMECODE) 244 memcpy(&out_vb->v4l2_buf.timecode, &in_vb->v4l2_buf.timecode, 245 sizeof(struct v4l2_timecode)); 246 out_vb->v4l2_buf.field = in_vb->v4l2_buf.field; 247 out_vb->v4l2_buf.flags = in_vb->v4l2_buf.flags & 248 (V4L2_BUF_FLAG_TIMECODE | 249 V4L2_BUF_FLAG_KEYFRAME | 250 V4L2_BUF_FLAG_PFRAME | 251 V4L2_BUF_FLAG_BFRAME | 252 V4L2_BUF_FLAG_TSTAMP_SRC_MASK); 253 254 switch (ctx->mode) { 255 case MEM2MEM_HFLIP | MEM2MEM_VFLIP: 256 p_out += bytesperline * height - bytes_left; 257 for (y = 0; y < height; ++y) { 258 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 259 if (w & 0x1) { 260 for (x = 0; x < tile_w; ++x) 261 *--p_out = *p_in++ + 262 MEM2MEM_COLOR_STEP; 263 } else { 264 for (x = 0; x < tile_w; ++x) 265 *--p_out = *p_in++ - 266 MEM2MEM_COLOR_STEP; 267 } 268 ++w; 269 } 270 p_in += bytes_left; 271 p_out -= bytes_left; 272 } 273 break; 274 275 case MEM2MEM_HFLIP: 276 for (y = 0; y < height; ++y) { 277 p_out += MEM2MEM_NUM_TILES * tile_w; 278 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 279 if (w & 0x01) { 280 for (x = 0; x < tile_w; ++x) 281 *--p_out = *p_in++ + 282 MEM2MEM_COLOR_STEP; 283 } else { 284 for (x = 0; x < tile_w; ++x) 285 *--p_out = *p_in++ - 286 MEM2MEM_COLOR_STEP; 287 } 288 ++w; 289 } 290 p_in += bytes_left; 291 p_out += bytesperline; 292 } 293 break; 294 295 case MEM2MEM_VFLIP: 296 p_out += bytesperline * (height - 1); 297 for (y = 0; y < height; ++y) { 298 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 299 if (w & 0x1) { 300 for (x = 0; x < tile_w; ++x) 301 *p_out++ = *p_in++ + 302 MEM2MEM_COLOR_STEP; 303 } else { 304 for (x = 0; x < tile_w; ++x) 305 *p_out++ = *p_in++ - 306 MEM2MEM_COLOR_STEP; 307 } 308 ++w; 309 } 310 p_in += bytes_left; 311 p_out += bytes_left - 2 * bytesperline; 312 } 313 break; 314 315 default: 316 for (y = 0; y < height; ++y) { 317 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 318 if (w & 0x1) { 319 for (x = 0; x < tile_w; ++x) 320 *p_out++ = *p_in++ + 321 MEM2MEM_COLOR_STEP; 322 } else { 323 for (x = 0; x < tile_w; ++x) 324 *p_out++ = *p_in++ - 325 MEM2MEM_COLOR_STEP; 326 } 327 ++w; 328 } 329 p_in += bytes_left; 330 p_out += bytes_left; 331 } 332 } 333 334 return 0; 335} 336 337static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout) 338{ 339 dprintk(dev, "Scheduling a simulated irq\n"); 340 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout)); 341} 342 343/* 344 * mem2mem callbacks 345 */ 346 347/** 348 * job_ready() - check whether an instance is ready to be scheduled to run 349 */ 350static int job_ready(void *priv) 351{ 352 struct m2mtest_ctx *ctx = priv; 353 354 if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen 355 || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) { 356 dprintk(ctx->dev, "Not enough buffers available\n"); 357 return 0; 358 } 359 360 return 1; 361} 362 363static void job_abort(void *priv) 364{ 365 struct m2mtest_ctx *ctx = priv; 366 367 /* Will cancel the transaction in the next interrupt handler */ 368 ctx->aborting = 1; 369} 370 371/* device_run() - prepares and starts the device 372 * 373 * This simulates all the immediate preparations required before starting 374 * a device. This will be called by the framework when it decides to schedule 375 * a particular instance. 376 */ 377static void device_run(void *priv) 378{ 379 struct m2mtest_ctx *ctx = priv; 380 struct m2mtest_dev *dev = ctx->dev; 381 struct vb2_buffer *src_buf, *dst_buf; 382 383 src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); 384 dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); 385 386 device_process(ctx, src_buf, dst_buf); 387 388 /* Run a timer, which simulates a hardware irq */ 389 schedule_irq(dev, ctx->transtime); 390} 391 392static void device_isr(unsigned long priv) 393{ 394 struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv; 395 struct m2mtest_ctx *curr_ctx; 396 struct vb2_buffer *src_vb, *dst_vb; 397 unsigned long flags; 398 399 curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev); 400 401 if (NULL == curr_ctx) { 402 pr_err("Instance released before the end of transaction\n"); 403 return; 404 } 405 406 src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx); 407 dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx); 408 409 curr_ctx->num_processed++; 410 411 spin_lock_irqsave(&m2mtest_dev->irqlock, flags); 412 v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE); 413 v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE); 414 spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags); 415 416 if (curr_ctx->num_processed == curr_ctx->translen 417 || curr_ctx->aborting) { 418 dprintk(curr_ctx->dev, "Finishing transaction\n"); 419 curr_ctx->num_processed = 0; 420 v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->fh.m2m_ctx); 421 } else { 422 device_run(curr_ctx); 423 } 424} 425 426/* 427 * video ioctls 428 */ 429static int vidioc_querycap(struct file *file, void *priv, 430 struct v4l2_capability *cap) 431{ 432 strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1); 433 strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1); 434 snprintf(cap->bus_info, sizeof(cap->bus_info), 435 "platform:%s", MEM2MEM_NAME); 436 cap->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING; 437 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 438 return 0; 439} 440 441static int enum_fmt(struct v4l2_fmtdesc *f, u32 type) 442{ 443 int i, num; 444 struct m2mtest_fmt *fmt; 445 446 num = 0; 447 448 for (i = 0; i < NUM_FORMATS; ++i) { 449 if (formats[i].types & type) { 450 /* index-th format of type type found ? */ 451 if (num == f->index) 452 break; 453 /* Correct type but haven't reached our index yet, 454 * just increment per-type index */ 455 ++num; 456 } 457 } 458 459 if (i < NUM_FORMATS) { 460 /* Format found */ 461 fmt = &formats[i]; 462 strncpy(f->description, fmt->name, sizeof(f->description) - 1); 463 f->pixelformat = fmt->fourcc; 464 return 0; 465 } 466 467 /* Format not found */ 468 return -EINVAL; 469} 470 471static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 472 struct v4l2_fmtdesc *f) 473{ 474 return enum_fmt(f, MEM2MEM_CAPTURE); 475} 476 477static int vidioc_enum_fmt_vid_out(struct file *file, void *priv, 478 struct v4l2_fmtdesc *f) 479{ 480 return enum_fmt(f, MEM2MEM_OUTPUT); 481} 482 483static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f) 484{ 485 struct vb2_queue *vq; 486 struct m2mtest_q_data *q_data; 487 488 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); 489 if (!vq) 490 return -EINVAL; 491 492 q_data = get_q_data(ctx, f->type); 493 494 f->fmt.pix.width = q_data->width; 495 f->fmt.pix.height = q_data->height; 496 f->fmt.pix.field = V4L2_FIELD_NONE; 497 f->fmt.pix.pixelformat = q_data->fmt->fourcc; 498 f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3; 499 f->fmt.pix.sizeimage = q_data->sizeimage; 500 f->fmt.pix.colorspace = ctx->colorspace; 501 502 return 0; 503} 504 505static int vidioc_g_fmt_vid_out(struct file *file, void *priv, 506 struct v4l2_format *f) 507{ 508 return vidioc_g_fmt(file2ctx(file), f); 509} 510 511static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 512 struct v4l2_format *f) 513{ 514 return vidioc_g_fmt(file2ctx(file), f); 515} 516 517static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt) 518{ 519 /* V4L2 specification suggests the driver corrects the format struct 520 * if any of the dimensions is unsupported */ 521 if (f->fmt.pix.height < MIN_H) 522 f->fmt.pix.height = MIN_H; 523 else if (f->fmt.pix.height > MAX_H) 524 f->fmt.pix.height = MAX_H; 525 526 if (f->fmt.pix.width < MIN_W) 527 f->fmt.pix.width = MIN_W; 528 else if (f->fmt.pix.width > MAX_W) 529 f->fmt.pix.width = MAX_W; 530 531 f->fmt.pix.width &= ~DIM_ALIGN_MASK; 532 f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3; 533 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 534 f->fmt.pix.field = V4L2_FIELD_NONE; 535 536 return 0; 537} 538 539static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 540 struct v4l2_format *f) 541{ 542 struct m2mtest_fmt *fmt; 543 struct m2mtest_ctx *ctx = file2ctx(file); 544 545 fmt = find_format(f); 546 if (!fmt) { 547 f->fmt.pix.pixelformat = formats[0].fourcc; 548 fmt = find_format(f); 549 } 550 if (!(fmt->types & MEM2MEM_CAPTURE)) { 551 v4l2_err(&ctx->dev->v4l2_dev, 552 "Fourcc format (0x%08x) invalid.\n", 553 f->fmt.pix.pixelformat); 554 return -EINVAL; 555 } 556 f->fmt.pix.colorspace = ctx->colorspace; 557 558 return vidioc_try_fmt(f, fmt); 559} 560 561static int vidioc_try_fmt_vid_out(struct file *file, void *priv, 562 struct v4l2_format *f) 563{ 564 struct m2mtest_fmt *fmt; 565 struct m2mtest_ctx *ctx = file2ctx(file); 566 567 fmt = find_format(f); 568 if (!fmt) { 569 f->fmt.pix.pixelformat = formats[0].fourcc; 570 fmt = find_format(f); 571 } 572 if (!(fmt->types & MEM2MEM_OUTPUT)) { 573 v4l2_err(&ctx->dev->v4l2_dev, 574 "Fourcc format (0x%08x) invalid.\n", 575 f->fmt.pix.pixelformat); 576 return -EINVAL; 577 } 578 if (!f->fmt.pix.colorspace) 579 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709; 580 581 return vidioc_try_fmt(f, fmt); 582} 583 584static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f) 585{ 586 struct m2mtest_q_data *q_data; 587 struct vb2_queue *vq; 588 589 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); 590 if (!vq) 591 return -EINVAL; 592 593 q_data = get_q_data(ctx, f->type); 594 if (!q_data) 595 return -EINVAL; 596 597 if (vb2_is_busy(vq)) { 598 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__); 599 return -EBUSY; 600 } 601 602 q_data->fmt = find_format(f); 603 q_data->width = f->fmt.pix.width; 604 q_data->height = f->fmt.pix.height; 605 q_data->sizeimage = q_data->width * q_data->height 606 * q_data->fmt->depth >> 3; 607 608 dprintk(ctx->dev, 609 "Setting format for type %d, wxh: %dx%d, fmt: %d\n", 610 f->type, q_data->width, q_data->height, q_data->fmt->fourcc); 611 612 return 0; 613} 614 615static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 616 struct v4l2_format *f) 617{ 618 int ret; 619 620 ret = vidioc_try_fmt_vid_cap(file, priv, f); 621 if (ret) 622 return ret; 623 624 return vidioc_s_fmt(file2ctx(file), f); 625} 626 627static int vidioc_s_fmt_vid_out(struct file *file, void *priv, 628 struct v4l2_format *f) 629{ 630 struct m2mtest_ctx *ctx = file2ctx(file); 631 int ret; 632 633 ret = vidioc_try_fmt_vid_out(file, priv, f); 634 if (ret) 635 return ret; 636 637 ret = vidioc_s_fmt(file2ctx(file), f); 638 if (!ret) 639 ctx->colorspace = f->fmt.pix.colorspace; 640 return ret; 641} 642 643static int m2mtest_s_ctrl(struct v4l2_ctrl *ctrl) 644{ 645 struct m2mtest_ctx *ctx = 646 container_of(ctrl->handler, struct m2mtest_ctx, hdl); 647 648 switch (ctrl->id) { 649 case V4L2_CID_HFLIP: 650 if (ctrl->val) 651 ctx->mode |= MEM2MEM_HFLIP; 652 else 653 ctx->mode &= ~MEM2MEM_HFLIP; 654 break; 655 656 case V4L2_CID_VFLIP: 657 if (ctrl->val) 658 ctx->mode |= MEM2MEM_VFLIP; 659 else 660 ctx->mode &= ~MEM2MEM_VFLIP; 661 break; 662 663 case V4L2_CID_TRANS_TIME_MSEC: 664 ctx->transtime = ctrl->val; 665 break; 666 667 case V4L2_CID_TRANS_NUM_BUFS: 668 ctx->translen = ctrl->val; 669 break; 670 671 default: 672 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n"); 673 return -EINVAL; 674 } 675 676 return 0; 677} 678 679static const struct v4l2_ctrl_ops m2mtest_ctrl_ops = { 680 .s_ctrl = m2mtest_s_ctrl, 681}; 682 683 684static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = { 685 .vidioc_querycap = vidioc_querycap, 686 687 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 688 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 689 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 690 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 691 692 .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out, 693 .vidioc_g_fmt_vid_out = vidioc_g_fmt_vid_out, 694 .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out, 695 .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out, 696 697 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs, 698 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf, 699 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf, 700 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf, 701 702 .vidioc_streamon = v4l2_m2m_ioctl_streamon, 703 .vidioc_streamoff = v4l2_m2m_ioctl_streamoff, 704 705 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 706 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 707}; 708 709 710/* 711 * Queue operations 712 */ 713 714static int m2mtest_queue_setup(struct vb2_queue *vq, 715 const struct v4l2_format *fmt, 716 unsigned int *nbuffers, unsigned int *nplanes, 717 unsigned int sizes[], void *alloc_ctxs[]) 718{ 719 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq); 720 struct m2mtest_q_data *q_data; 721 unsigned int size, count = *nbuffers; 722 723 q_data = get_q_data(ctx, vq->type); 724 725 size = q_data->width * q_data->height * q_data->fmt->depth >> 3; 726 727 while (size * count > MEM2MEM_VID_MEM_LIMIT) 728 (count)--; 729 730 *nplanes = 1; 731 *nbuffers = count; 732 sizes[0] = size; 733 734 /* 735 * videobuf2-vmalloc allocator is context-less so no need to set 736 * alloc_ctxs array. 737 */ 738 739 dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size); 740 741 return 0; 742} 743 744static int m2mtest_buf_prepare(struct vb2_buffer *vb) 745{ 746 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 747 struct m2mtest_q_data *q_data; 748 749 dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type); 750 751 q_data = get_q_data(ctx, vb->vb2_queue->type); 752 if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) { 753 if (vb->v4l2_buf.field == V4L2_FIELD_ANY) 754 vb->v4l2_buf.field = V4L2_FIELD_NONE; 755 if (vb->v4l2_buf.field != V4L2_FIELD_NONE) { 756 dprintk(ctx->dev, "%s field isn't supported\n", 757 __func__); 758 return -EINVAL; 759 } 760 } 761 762 if (vb2_plane_size(vb, 0) < q_data->sizeimage) { 763 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n", 764 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage); 765 return -EINVAL; 766 } 767 768 vb2_set_plane_payload(vb, 0, q_data->sizeimage); 769 770 return 0; 771} 772 773static void m2mtest_buf_queue(struct vb2_buffer *vb) 774{ 775 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 776 777 v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vb); 778} 779 780static int m2mtest_start_streaming(struct vb2_queue *q, unsigned count) 781{ 782 struct m2mtest_ctx *ctx = vb2_get_drv_priv(q); 783 struct m2mtest_q_data *q_data = get_q_data(ctx, q->type); 784 785 q_data->sequence = 0; 786 return 0; 787} 788 789static void m2mtest_stop_streaming(struct vb2_queue *q) 790{ 791 struct m2mtest_ctx *ctx = vb2_get_drv_priv(q); 792 struct vb2_buffer *vb; 793 unsigned long flags; 794 795 for (;;) { 796 if (V4L2_TYPE_IS_OUTPUT(q->type)) 797 vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); 798 else 799 vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); 800 if (vb == NULL) 801 return; 802 spin_lock_irqsave(&ctx->dev->irqlock, flags); 803 v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR); 804 spin_unlock_irqrestore(&ctx->dev->irqlock, flags); 805 } 806} 807 808static struct vb2_ops m2mtest_qops = { 809 .queue_setup = m2mtest_queue_setup, 810 .buf_prepare = m2mtest_buf_prepare, 811 .buf_queue = m2mtest_buf_queue, 812 .start_streaming = m2mtest_start_streaming, 813 .stop_streaming = m2mtest_stop_streaming, 814 .wait_prepare = vb2_ops_wait_prepare, 815 .wait_finish = vb2_ops_wait_finish, 816}; 817 818static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq) 819{ 820 struct m2mtest_ctx *ctx = priv; 821 int ret; 822 823 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; 824 src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 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 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 830 src_vq->lock = &ctx->dev->dev_mutex; 831 832 ret = vb2_queue_init(src_vq); 833 if (ret) 834 return ret; 835 836 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 837 dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 838 dst_vq->drv_priv = ctx; 839 dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 840 dst_vq->ops = &m2mtest_qops; 841 dst_vq->mem_ops = &vb2_vmalloc_memops; 842 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 843 dst_vq->lock = &ctx->dev->dev_mutex; 844 845 return vb2_queue_init(dst_vq); 846} 847 848static const struct v4l2_ctrl_config m2mtest_ctrl_trans_time_msec = { 849 .ops = &m2mtest_ctrl_ops, 850 .id = V4L2_CID_TRANS_TIME_MSEC, 851 .name = "Transaction Time (msec)", 852 .type = V4L2_CTRL_TYPE_INTEGER, 853 .def = MEM2MEM_DEF_TRANSTIME, 854 .min = 1, 855 .max = 10001, 856 .step = 1, 857}; 858 859static const struct v4l2_ctrl_config m2mtest_ctrl_trans_num_bufs = { 860 .ops = &m2mtest_ctrl_ops, 861 .id = V4L2_CID_TRANS_NUM_BUFS, 862 .name = "Buffers Per Transaction", 863 .type = V4L2_CTRL_TYPE_INTEGER, 864 .def = 1, 865 .min = 1, 866 .max = MEM2MEM_DEF_NUM_BUFS, 867 .step = 1, 868}; 869 870/* 871 * File operations 872 */ 873static int m2mtest_open(struct file *file) 874{ 875 struct m2mtest_dev *dev = video_drvdata(file); 876 struct m2mtest_ctx *ctx = NULL; 877 struct v4l2_ctrl_handler *hdl; 878 int rc = 0; 879 880 if (mutex_lock_interruptible(&dev->dev_mutex)) 881 return -ERESTARTSYS; 882 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 883 if (!ctx) { 884 rc = -ENOMEM; 885 goto open_unlock; 886 } 887 888 v4l2_fh_init(&ctx->fh, video_devdata(file)); 889 file->private_data = &ctx->fh; 890 ctx->dev = dev; 891 hdl = &ctx->hdl; 892 v4l2_ctrl_handler_init(hdl, 4); 893 v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0); 894 v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0); 895 v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_time_msec, NULL); 896 v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_num_bufs, NULL); 897 if (hdl->error) { 898 rc = hdl->error; 899 v4l2_ctrl_handler_free(hdl); 900 goto open_unlock; 901 } 902 ctx->fh.ctrl_handler = hdl; 903 v4l2_ctrl_handler_setup(hdl); 904 905 ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0]; 906 ctx->q_data[V4L2_M2M_SRC].width = 640; 907 ctx->q_data[V4L2_M2M_SRC].height = 480; 908 ctx->q_data[V4L2_M2M_SRC].sizeimage = 909 ctx->q_data[V4L2_M2M_SRC].width * 910 ctx->q_data[V4L2_M2M_SRC].height * 911 (ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3); 912 ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC]; 913 ctx->colorspace = V4L2_COLORSPACE_REC709; 914 915 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init); 916 917 if (IS_ERR(ctx->fh.m2m_ctx)) { 918 rc = PTR_ERR(ctx->fh.m2m_ctx); 919 920 v4l2_ctrl_handler_free(hdl); 921 kfree(ctx); 922 goto open_unlock; 923 } 924 925 v4l2_fh_add(&ctx->fh); 926 atomic_inc(&dev->num_inst); 927 928 dprintk(dev, "Created instance: %p, m2m_ctx: %p\n", 929 ctx, ctx->fh.m2m_ctx); 930 931open_unlock: 932 mutex_unlock(&dev->dev_mutex); 933 return rc; 934} 935 936static int m2mtest_release(struct file *file) 937{ 938 struct m2mtest_dev *dev = video_drvdata(file); 939 struct m2mtest_ctx *ctx = file2ctx(file); 940 941 dprintk(dev, "Releasing instance %p\n", ctx); 942 943 v4l2_fh_del(&ctx->fh); 944 v4l2_fh_exit(&ctx->fh); 945 v4l2_ctrl_handler_free(&ctx->hdl); 946 mutex_lock(&dev->dev_mutex); 947 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); 948 mutex_unlock(&dev->dev_mutex); 949 kfree(ctx); 950 951 atomic_dec(&dev->num_inst); 952 953 return 0; 954} 955 956static const struct v4l2_file_operations m2mtest_fops = { 957 .owner = THIS_MODULE, 958 .open = m2mtest_open, 959 .release = m2mtest_release, 960 .poll = v4l2_m2m_fop_poll, 961 .unlocked_ioctl = video_ioctl2, 962 .mmap = v4l2_m2m_fop_mmap, 963}; 964 965static struct video_device m2mtest_videodev = { 966 .name = MEM2MEM_NAME, 967 .vfl_dir = VFL_DIR_M2M, 968 .fops = &m2mtest_fops, 969 .ioctl_ops = &m2mtest_ioctl_ops, 970 .minor = -1, 971 .release = video_device_release, 972}; 973 974static struct v4l2_m2m_ops m2m_ops = { 975 .device_run = device_run, 976 .job_ready = job_ready, 977 .job_abort = job_abort, 978}; 979 980static int m2mtest_probe(struct platform_device *pdev) 981{ 982 struct m2mtest_dev *dev; 983 struct video_device *vfd; 984 int ret; 985 986 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 987 if (!dev) 988 return -ENOMEM; 989 990 spin_lock_init(&dev->irqlock); 991 992 ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev); 993 if (ret) 994 return ret; 995 996 atomic_set(&dev->num_inst, 0); 997 mutex_init(&dev->dev_mutex); 998 999 vfd = video_device_alloc(); 1000 if (!vfd) { 1001 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n"); 1002 ret = -ENOMEM; 1003 goto unreg_dev; 1004 } 1005 1006 *vfd = m2mtest_videodev; 1007 vfd->lock = &dev->dev_mutex; 1008 vfd->v4l2_dev = &dev->v4l2_dev; 1009 1010 ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); 1011 if (ret) { 1012 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); 1013 goto rel_vdev; 1014 } 1015 1016 video_set_drvdata(vfd, dev); 1017 snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name); 1018 dev->vfd = vfd; 1019 v4l2_info(&dev->v4l2_dev, 1020 "Device registered as /dev/video%d\n", vfd->num); 1021 1022 setup_timer(&dev->timer, device_isr, (long)dev); 1023 platform_set_drvdata(pdev, dev); 1024 1025 dev->m2m_dev = v4l2_m2m_init(&m2m_ops); 1026 if (IS_ERR(dev->m2m_dev)) { 1027 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n"); 1028 ret = PTR_ERR(dev->m2m_dev); 1029 goto err_m2m; 1030 } 1031 1032 return 0; 1033 1034err_m2m: 1035 v4l2_m2m_release(dev->m2m_dev); 1036 video_unregister_device(dev->vfd); 1037rel_vdev: 1038 video_device_release(vfd); 1039unreg_dev: 1040 v4l2_device_unregister(&dev->v4l2_dev); 1041 1042 return ret; 1043} 1044 1045static int m2mtest_remove(struct platform_device *pdev) 1046{ 1047 struct m2mtest_dev *dev = platform_get_drvdata(pdev); 1048 1049 v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME); 1050 v4l2_m2m_release(dev->m2m_dev); 1051 del_timer_sync(&dev->timer); 1052 video_unregister_device(dev->vfd); 1053 v4l2_device_unregister(&dev->v4l2_dev); 1054 1055 return 0; 1056} 1057 1058static struct platform_driver m2mtest_pdrv = { 1059 .probe = m2mtest_probe, 1060 .remove = m2mtest_remove, 1061 .driver = { 1062 .name = MEM2MEM_NAME, 1063 .owner = THIS_MODULE, 1064 }, 1065}; 1066 1067static void __exit m2mtest_exit(void) 1068{ 1069 platform_driver_unregister(&m2mtest_pdrv); 1070 platform_device_unregister(&m2mtest_pdev); 1071} 1072 1073static int __init m2mtest_init(void) 1074{ 1075 int ret; 1076 1077 ret = platform_device_register(&m2mtest_pdev); 1078 if (ret) 1079 return ret; 1080 1081 ret = platform_driver_register(&m2mtest_pdrv); 1082 if (ret) 1083 platform_device_unregister(&m2mtest_pdev); 1084 1085 return 0; 1086} 1087 1088module_init(m2mtest_init); 1089module_exit(m2mtest_exit); 1090