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 34MODULE_DESCRIPTION("Virtual device for mem2mem framework testing"); 35MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); 36MODULE_LICENSE("GPL"); 37MODULE_VERSION("0.1.1"); 38MODULE_ALIAS("mem2mem_testdev"); 39 40static unsigned debug; 41module_param(debug, uint, 0644); 42MODULE_PARM_DESC(debug, "activates debug info"); 43 44#define MIN_W 32 45#define MIN_H 32 46#define MAX_W 640 47#define MAX_H 480 48#define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */ 49 50/* Flags that indicate a format can be used for capture/output */ 51#define MEM2MEM_CAPTURE (1 << 0) 52#define MEM2MEM_OUTPUT (1 << 1) 53 54#define MEM2MEM_NAME "vim2m" 55 56/* Per queue */ 57#define MEM2MEM_DEF_NUM_BUFS VIDEO_MAX_FRAME 58/* In bytes, per queue */ 59#define MEM2MEM_VID_MEM_LIMIT (16 * 1024 * 1024) 60 61/* Default transaction time in msec */ 62#define MEM2MEM_DEF_TRANSTIME 40 63#define MEM2MEM_COLOR_STEP (0xff >> 4) 64#define MEM2MEM_NUM_TILES 8 65 66/* Flags that indicate processing mode */ 67#define MEM2MEM_HFLIP (1 << 0) 68#define MEM2MEM_VFLIP (1 << 1) 69 70#define dprintk(dev, fmt, arg...) \ 71 v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg) 72 73 74static void vim2m_dev_release(struct device *dev) 75{} 76 77static struct platform_device vim2m_pdev = { 78 .name = MEM2MEM_NAME, 79 .dev.release = vim2m_dev_release, 80}; 81 82struct vim2m_fmt { 83 u32 fourcc; 84 int depth; 85 /* Types the format can be used for */ 86 u32 types; 87}; 88 89static struct vim2m_fmt formats[] = { 90 { 91 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */ 92 .depth = 16, 93 /* Both capture and output format */ 94 .types = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT, 95 }, 96 { 97 .fourcc = V4L2_PIX_FMT_YUYV, 98 .depth = 16, 99 /* Output-only format */ 100 .types = MEM2MEM_OUTPUT, 101 }, 102}; 103 104#define NUM_FORMATS ARRAY_SIZE(formats) 105 106/* Per-queue, driver-specific private data */ 107struct vim2m_q_data { 108 unsigned int width; 109 unsigned int height; 110 unsigned int sizeimage; 111 unsigned int sequence; 112 struct vim2m_fmt *fmt; 113}; 114 115enum { 116 V4L2_M2M_SRC = 0, 117 V4L2_M2M_DST = 1, 118}; 119 120#define V4L2_CID_TRANS_TIME_MSEC (V4L2_CID_USER_BASE + 0x1000) 121#define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_USER_BASE + 0x1001) 122 123static struct vim2m_fmt *find_format(struct v4l2_format *f) 124{ 125 struct vim2m_fmt *fmt; 126 unsigned int k; 127 128 for (k = 0; k < NUM_FORMATS; k++) { 129 fmt = &formats[k]; 130 if (fmt->fourcc == f->fmt.pix.pixelformat) 131 break; 132 } 133 134 if (k == NUM_FORMATS) 135 return NULL; 136 137 return &formats[k]; 138} 139 140struct vim2m_dev { 141 struct v4l2_device v4l2_dev; 142 struct video_device vfd; 143 144 atomic_t num_inst; 145 struct mutex dev_mutex; 146 spinlock_t irqlock; 147 148 struct timer_list timer; 149 150 struct v4l2_m2m_dev *m2m_dev; 151}; 152 153struct vim2m_ctx { 154 struct v4l2_fh fh; 155 struct vim2m_dev *dev; 156 157 struct v4l2_ctrl_handler hdl; 158 159 /* Processed buffers in this transaction */ 160 u8 num_processed; 161 162 /* Transaction length (i.e. how many buffers per transaction) */ 163 u32 translen; 164 /* Transaction time (i.e. simulated processing time) in milliseconds */ 165 u32 transtime; 166 167 /* Abort requested by m2m */ 168 int aborting; 169 170 /* Processing mode */ 171 int mode; 172 173 enum v4l2_colorspace colorspace; 174 175 /* Source and destination queue data */ 176 struct vim2m_q_data q_data[2]; 177}; 178 179static inline struct vim2m_ctx *file2ctx(struct file *file) 180{ 181 return container_of(file->private_data, struct vim2m_ctx, fh); 182} 183 184static struct vim2m_q_data *get_q_data(struct vim2m_ctx *ctx, 185 enum v4l2_buf_type type) 186{ 187 switch (type) { 188 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 189 return &ctx->q_data[V4L2_M2M_SRC]; 190 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 191 return &ctx->q_data[V4L2_M2M_DST]; 192 default: 193 BUG(); 194 } 195 return NULL; 196} 197 198 199static int device_process(struct vim2m_ctx *ctx, 200 struct vb2_v4l2_buffer *in_vb, 201 struct vb2_v4l2_buffer *out_vb) 202{ 203 struct vim2m_dev *dev = ctx->dev; 204 struct vim2m_q_data *q_data; 205 u8 *p_in, *p_out; 206 int x, y, t, w; 207 int tile_w, bytes_left; 208 int width, height, bytesperline; 209 210 q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); 211 212 width = q_data->width; 213 height = q_data->height; 214 bytesperline = (q_data->width * q_data->fmt->depth) >> 3; 215 216 p_in = vb2_plane_vaddr(&in_vb->vb2_buf, 0); 217 p_out = vb2_plane_vaddr(&out_vb->vb2_buf, 0); 218 if (!p_in || !p_out) { 219 v4l2_err(&dev->v4l2_dev, 220 "Acquiring kernel pointers to buffers failed\n"); 221 return -EFAULT; 222 } 223 224 if (vb2_plane_size(&in_vb->vb2_buf, 0) > 225 vb2_plane_size(&out_vb->vb2_buf, 0)) { 226 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n"); 227 return -EINVAL; 228 } 229 230 tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3)) 231 / MEM2MEM_NUM_TILES; 232 bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES; 233 w = 0; 234 235 out_vb->sequence = 236 get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE)->sequence++; 237 in_vb->sequence = q_data->sequence++; 238 out_vb->timestamp = in_vb->timestamp; 239 240 if (in_vb->flags & V4L2_BUF_FLAG_TIMECODE) 241 out_vb->timecode = in_vb->timecode; 242 out_vb->field = in_vb->field; 243 out_vb->flags = in_vb->flags & 244 (V4L2_BUF_FLAG_TIMECODE | 245 V4L2_BUF_FLAG_KEYFRAME | 246 V4L2_BUF_FLAG_PFRAME | 247 V4L2_BUF_FLAG_BFRAME | 248 V4L2_BUF_FLAG_TSTAMP_SRC_MASK); 249 250 switch (ctx->mode) { 251 case MEM2MEM_HFLIP | MEM2MEM_VFLIP: 252 p_out += bytesperline * height - bytes_left; 253 for (y = 0; y < height; ++y) { 254 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 255 if (w & 0x1) { 256 for (x = 0; x < tile_w; ++x) 257 *--p_out = *p_in++ + 258 MEM2MEM_COLOR_STEP; 259 } else { 260 for (x = 0; x < tile_w; ++x) 261 *--p_out = *p_in++ - 262 MEM2MEM_COLOR_STEP; 263 } 264 ++w; 265 } 266 p_in += bytes_left; 267 p_out -= bytes_left; 268 } 269 break; 270 271 case MEM2MEM_HFLIP: 272 for (y = 0; y < height; ++y) { 273 p_out += MEM2MEM_NUM_TILES * tile_w; 274 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 275 if (w & 0x01) { 276 for (x = 0; x < tile_w; ++x) 277 *--p_out = *p_in++ + 278 MEM2MEM_COLOR_STEP; 279 } else { 280 for (x = 0; x < tile_w; ++x) 281 *--p_out = *p_in++ - 282 MEM2MEM_COLOR_STEP; 283 } 284 ++w; 285 } 286 p_in += bytes_left; 287 p_out += bytesperline; 288 } 289 break; 290 291 case MEM2MEM_VFLIP: 292 p_out += bytesperline * (height - 1); 293 for (y = 0; y < height; ++y) { 294 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 295 if (w & 0x1) { 296 for (x = 0; x < tile_w; ++x) 297 *p_out++ = *p_in++ + 298 MEM2MEM_COLOR_STEP; 299 } else { 300 for (x = 0; x < tile_w; ++x) 301 *p_out++ = *p_in++ - 302 MEM2MEM_COLOR_STEP; 303 } 304 ++w; 305 } 306 p_in += bytes_left; 307 p_out += bytes_left - 2 * bytesperline; 308 } 309 break; 310 311 default: 312 for (y = 0; y < height; ++y) { 313 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { 314 if (w & 0x1) { 315 for (x = 0; x < tile_w; ++x) 316 *p_out++ = *p_in++ + 317 MEM2MEM_COLOR_STEP; 318 } else { 319 for (x = 0; x < tile_w; ++x) 320 *p_out++ = *p_in++ - 321 MEM2MEM_COLOR_STEP; 322 } 323 ++w; 324 } 325 p_in += bytes_left; 326 p_out += bytes_left; 327 } 328 } 329 330 return 0; 331} 332 333static void schedule_irq(struct vim2m_dev *dev, int msec_timeout) 334{ 335 dprintk(dev, "Scheduling a simulated irq\n"); 336 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout)); 337} 338 339/* 340 * mem2mem callbacks 341 */ 342 343/** 344 * job_ready() - check whether an instance is ready to be scheduled to run 345 */ 346static int job_ready(void *priv) 347{ 348 struct vim2m_ctx *ctx = priv; 349 350 if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen 351 || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) { 352 dprintk(ctx->dev, "Not enough buffers available\n"); 353 return 0; 354 } 355 356 return 1; 357} 358 359static void job_abort(void *priv) 360{ 361 struct vim2m_ctx *ctx = priv; 362 363 /* Will cancel the transaction in the next interrupt handler */ 364 ctx->aborting = 1; 365} 366 367/* device_run() - prepares and starts the device 368 * 369 * This simulates all the immediate preparations required before starting 370 * a device. This will be called by the framework when it decides to schedule 371 * a particular instance. 372 */ 373static void device_run(void *priv) 374{ 375 struct vim2m_ctx *ctx = priv; 376 struct vim2m_dev *dev = ctx->dev; 377 struct vb2_v4l2_buffer *src_buf, *dst_buf; 378 379 src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); 380 dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); 381 382 device_process(ctx, src_buf, dst_buf); 383 384 /* Run a timer, which simulates a hardware irq */ 385 schedule_irq(dev, ctx->transtime); 386} 387 388static void device_isr(unsigned long priv) 389{ 390 struct vim2m_dev *vim2m_dev = (struct vim2m_dev *)priv; 391 struct vim2m_ctx *curr_ctx; 392 struct vb2_v4l2_buffer *src_vb, *dst_vb; 393 unsigned long flags; 394 395 curr_ctx = v4l2_m2m_get_curr_priv(vim2m_dev->m2m_dev); 396 397 if (NULL == curr_ctx) { 398 pr_err("Instance released before the end of transaction\n"); 399 return; 400 } 401 402 src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx); 403 dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx); 404 405 curr_ctx->num_processed++; 406 407 spin_lock_irqsave(&vim2m_dev->irqlock, flags); 408 v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE); 409 v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE); 410 spin_unlock_irqrestore(&vim2m_dev->irqlock, flags); 411 412 if (curr_ctx->num_processed == curr_ctx->translen 413 || curr_ctx->aborting) { 414 dprintk(curr_ctx->dev, "Finishing transaction\n"); 415 curr_ctx->num_processed = 0; 416 v4l2_m2m_job_finish(vim2m_dev->m2m_dev, curr_ctx->fh.m2m_ctx); 417 } else { 418 device_run(curr_ctx); 419 } 420} 421 422/* 423 * video ioctls 424 */ 425static int vidioc_querycap(struct file *file, void *priv, 426 struct v4l2_capability *cap) 427{ 428 strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1); 429 strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1); 430 snprintf(cap->bus_info, sizeof(cap->bus_info), 431 "platform:%s", MEM2MEM_NAME); 432 cap->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING; 433 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 434 return 0; 435} 436 437static int enum_fmt(struct v4l2_fmtdesc *f, u32 type) 438{ 439 int i, num; 440 struct vim2m_fmt *fmt; 441 442 num = 0; 443 444 for (i = 0; i < NUM_FORMATS; ++i) { 445 if (formats[i].types & type) { 446 /* index-th format of type type found ? */ 447 if (num == f->index) 448 break; 449 /* Correct type but haven't reached our index yet, 450 * just increment per-type index */ 451 ++num; 452 } 453 } 454 455 if (i < NUM_FORMATS) { 456 /* Format found */ 457 fmt = &formats[i]; 458 f->pixelformat = fmt->fourcc; 459 return 0; 460 } 461 462 /* Format not found */ 463 return -EINVAL; 464} 465 466static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 467 struct v4l2_fmtdesc *f) 468{ 469 return enum_fmt(f, MEM2MEM_CAPTURE); 470} 471 472static int vidioc_enum_fmt_vid_out(struct file *file, void *priv, 473 struct v4l2_fmtdesc *f) 474{ 475 return enum_fmt(f, MEM2MEM_OUTPUT); 476} 477 478static int vidioc_g_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f) 479{ 480 struct vb2_queue *vq; 481 struct vim2m_q_data *q_data; 482 483 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); 484 if (!vq) 485 return -EINVAL; 486 487 q_data = get_q_data(ctx, f->type); 488 489 f->fmt.pix.width = q_data->width; 490 f->fmt.pix.height = q_data->height; 491 f->fmt.pix.field = V4L2_FIELD_NONE; 492 f->fmt.pix.pixelformat = q_data->fmt->fourcc; 493 f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3; 494 f->fmt.pix.sizeimage = q_data->sizeimage; 495 f->fmt.pix.colorspace = ctx->colorspace; 496 497 return 0; 498} 499 500static int vidioc_g_fmt_vid_out(struct file *file, void *priv, 501 struct v4l2_format *f) 502{ 503 return vidioc_g_fmt(file2ctx(file), f); 504} 505 506static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 507 struct v4l2_format *f) 508{ 509 return vidioc_g_fmt(file2ctx(file), f); 510} 511 512static int vidioc_try_fmt(struct v4l2_format *f, struct vim2m_fmt *fmt) 513{ 514 /* V4L2 specification suggests the driver corrects the format struct 515 * if any of the dimensions is unsupported */ 516 if (f->fmt.pix.height < MIN_H) 517 f->fmt.pix.height = MIN_H; 518 else if (f->fmt.pix.height > MAX_H) 519 f->fmt.pix.height = MAX_H; 520 521 if (f->fmt.pix.width < MIN_W) 522 f->fmt.pix.width = MIN_W; 523 else if (f->fmt.pix.width > MAX_W) 524 f->fmt.pix.width = MAX_W; 525 526 f->fmt.pix.width &= ~DIM_ALIGN_MASK; 527 f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3; 528 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 529 f->fmt.pix.field = V4L2_FIELD_NONE; 530 531 return 0; 532} 533 534static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 535 struct v4l2_format *f) 536{ 537 struct vim2m_fmt *fmt; 538 struct vim2m_ctx *ctx = file2ctx(file); 539 540 fmt = find_format(f); 541 if (!fmt) { 542 f->fmt.pix.pixelformat = formats[0].fourcc; 543 fmt = find_format(f); 544 } 545 if (!(fmt->types & MEM2MEM_CAPTURE)) { 546 v4l2_err(&ctx->dev->v4l2_dev, 547 "Fourcc format (0x%08x) invalid.\n", 548 f->fmt.pix.pixelformat); 549 return -EINVAL; 550 } 551 f->fmt.pix.colorspace = ctx->colorspace; 552 553 return vidioc_try_fmt(f, fmt); 554} 555 556static int vidioc_try_fmt_vid_out(struct file *file, void *priv, 557 struct v4l2_format *f) 558{ 559 struct vim2m_fmt *fmt; 560 struct vim2m_ctx *ctx = file2ctx(file); 561 562 fmt = find_format(f); 563 if (!fmt) { 564 f->fmt.pix.pixelformat = formats[0].fourcc; 565 fmt = find_format(f); 566 } 567 if (!(fmt->types & MEM2MEM_OUTPUT)) { 568 v4l2_err(&ctx->dev->v4l2_dev, 569 "Fourcc format (0x%08x) invalid.\n", 570 f->fmt.pix.pixelformat); 571 return -EINVAL; 572 } 573 if (!f->fmt.pix.colorspace) 574 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709; 575 576 return vidioc_try_fmt(f, fmt); 577} 578 579static int vidioc_s_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f) 580{ 581 struct vim2m_q_data *q_data; 582 struct vb2_queue *vq; 583 584 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); 585 if (!vq) 586 return -EINVAL; 587 588 q_data = get_q_data(ctx, f->type); 589 if (!q_data) 590 return -EINVAL; 591 592 if (vb2_is_busy(vq)) { 593 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__); 594 return -EBUSY; 595 } 596 597 q_data->fmt = find_format(f); 598 q_data->width = f->fmt.pix.width; 599 q_data->height = f->fmt.pix.height; 600 q_data->sizeimage = q_data->width * q_data->height 601 * q_data->fmt->depth >> 3; 602 603 dprintk(ctx->dev, 604 "Setting format for type %d, wxh: %dx%d, fmt: %d\n", 605 f->type, q_data->width, q_data->height, q_data->fmt->fourcc); 606 607 return 0; 608} 609 610static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 611 struct v4l2_format *f) 612{ 613 int ret; 614 615 ret = vidioc_try_fmt_vid_cap(file, priv, f); 616 if (ret) 617 return ret; 618 619 return vidioc_s_fmt(file2ctx(file), f); 620} 621 622static int vidioc_s_fmt_vid_out(struct file *file, void *priv, 623 struct v4l2_format *f) 624{ 625 struct vim2m_ctx *ctx = file2ctx(file); 626 int ret; 627 628 ret = vidioc_try_fmt_vid_out(file, priv, f); 629 if (ret) 630 return ret; 631 632 ret = vidioc_s_fmt(file2ctx(file), f); 633 if (!ret) 634 ctx->colorspace = f->fmt.pix.colorspace; 635 return ret; 636} 637 638static int vim2m_s_ctrl(struct v4l2_ctrl *ctrl) 639{ 640 struct vim2m_ctx *ctx = 641 container_of(ctrl->handler, struct vim2m_ctx, hdl); 642 643 switch (ctrl->id) { 644 case V4L2_CID_HFLIP: 645 if (ctrl->val) 646 ctx->mode |= MEM2MEM_HFLIP; 647 else 648 ctx->mode &= ~MEM2MEM_HFLIP; 649 break; 650 651 case V4L2_CID_VFLIP: 652 if (ctrl->val) 653 ctx->mode |= MEM2MEM_VFLIP; 654 else 655 ctx->mode &= ~MEM2MEM_VFLIP; 656 break; 657 658 case V4L2_CID_TRANS_TIME_MSEC: 659 ctx->transtime = ctrl->val; 660 break; 661 662 case V4L2_CID_TRANS_NUM_BUFS: 663 ctx->translen = ctrl->val; 664 break; 665 666 default: 667 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n"); 668 return -EINVAL; 669 } 670 671 return 0; 672} 673 674static const struct v4l2_ctrl_ops vim2m_ctrl_ops = { 675 .s_ctrl = vim2m_s_ctrl, 676}; 677 678 679static const struct v4l2_ioctl_ops vim2m_ioctl_ops = { 680 .vidioc_querycap = vidioc_querycap, 681 682 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 683 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 684 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 685 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 686 687 .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out, 688 .vidioc_g_fmt_vid_out = vidioc_g_fmt_vid_out, 689 .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out, 690 .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out, 691 692 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs, 693 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf, 694 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf, 695 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf, 696 .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf, 697 .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs, 698 .vidioc_expbuf = v4l2_m2m_ioctl_expbuf, 699 700 .vidioc_streamon = v4l2_m2m_ioctl_streamon, 701 .vidioc_streamoff = v4l2_m2m_ioctl_streamoff, 702 703 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 704 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 705}; 706 707 708/* 709 * Queue operations 710 */ 711 712static int vim2m_queue_setup(struct vb2_queue *vq, 713 const void *parg, 714 unsigned int *nbuffers, unsigned int *nplanes, 715 unsigned int sizes[], void *alloc_ctxs[]) 716{ 717 const struct v4l2_format *fmt = parg; 718 struct vim2m_ctx *ctx = vb2_get_drv_priv(vq); 719 struct vim2m_q_data *q_data; 720 unsigned int size, count = *nbuffers; 721 722 q_data = get_q_data(ctx, vq->type); 723 724 size = q_data->width * q_data->height * q_data->fmt->depth >> 3; 725 726 if (fmt) { 727 if (fmt->fmt.pix.sizeimage < size) 728 return -EINVAL; 729 size = fmt->fmt.pix.sizeimage; 730 } 731 732 while (size * count > MEM2MEM_VID_MEM_LIMIT) 733 (count)--; 734 735 *nplanes = 1; 736 *nbuffers = count; 737 sizes[0] = size; 738 739 /* 740 * videobuf2-vmalloc allocator is context-less so no need to set 741 * alloc_ctxs array. 742 */ 743 744 dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size); 745 746 return 0; 747} 748 749static int vim2m_buf_prepare(struct vb2_buffer *vb) 750{ 751 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 752 struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 753 struct vim2m_q_data *q_data; 754 755 dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type); 756 757 q_data = get_q_data(ctx, vb->vb2_queue->type); 758 if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) { 759 if (vbuf->field == V4L2_FIELD_ANY) 760 vbuf->field = V4L2_FIELD_NONE; 761 if (vbuf->field != V4L2_FIELD_NONE) { 762 dprintk(ctx->dev, "%s field isn't supported\n", 763 __func__); 764 return -EINVAL; 765 } 766 } 767 768 if (vb2_plane_size(vb, 0) < q_data->sizeimage) { 769 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n", 770 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage); 771 return -EINVAL; 772 } 773 774 vb2_set_plane_payload(vb, 0, q_data->sizeimage); 775 776 return 0; 777} 778 779static void vim2m_buf_queue(struct vb2_buffer *vb) 780{ 781 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 782 struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 783 784 v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf); 785} 786 787static int vim2m_start_streaming(struct vb2_queue *q, unsigned count) 788{ 789 struct vim2m_ctx *ctx = vb2_get_drv_priv(q); 790 struct vim2m_q_data *q_data = get_q_data(ctx, q->type); 791 792 q_data->sequence = 0; 793 return 0; 794} 795 796static void vim2m_stop_streaming(struct vb2_queue *q) 797{ 798 struct vim2m_ctx *ctx = vb2_get_drv_priv(q); 799 struct vb2_v4l2_buffer *vbuf; 800 unsigned long flags; 801 802 for (;;) { 803 if (V4L2_TYPE_IS_OUTPUT(q->type)) 804 vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); 805 else 806 vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); 807 if (vbuf == NULL) 808 return; 809 spin_lock_irqsave(&ctx->dev->irqlock, flags); 810 v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR); 811 spin_unlock_irqrestore(&ctx->dev->irqlock, flags); 812 } 813} 814 815static struct vb2_ops vim2m_qops = { 816 .queue_setup = vim2m_queue_setup, 817 .buf_prepare = vim2m_buf_prepare, 818 .buf_queue = vim2m_buf_queue, 819 .start_streaming = vim2m_start_streaming, 820 .stop_streaming = vim2m_stop_streaming, 821 .wait_prepare = vb2_ops_wait_prepare, 822 .wait_finish = vb2_ops_wait_finish, 823}; 824 825static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq) 826{ 827 struct vim2m_ctx *ctx = priv; 828 int ret; 829 830 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; 831 src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 832 src_vq->drv_priv = ctx; 833 src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 834 src_vq->ops = &vim2m_qops; 835 src_vq->mem_ops = &vb2_vmalloc_memops; 836 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 837 src_vq->lock = &ctx->dev->dev_mutex; 838 839 ret = vb2_queue_init(src_vq); 840 if (ret) 841 return ret; 842 843 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 844 dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 845 dst_vq->drv_priv = ctx; 846 dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 847 dst_vq->ops = &vim2m_qops; 848 dst_vq->mem_ops = &vb2_vmalloc_memops; 849 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 850 dst_vq->lock = &ctx->dev->dev_mutex; 851 852 return vb2_queue_init(dst_vq); 853} 854 855static const struct v4l2_ctrl_config vim2m_ctrl_trans_time_msec = { 856 .ops = &vim2m_ctrl_ops, 857 .id = V4L2_CID_TRANS_TIME_MSEC, 858 .name = "Transaction Time (msec)", 859 .type = V4L2_CTRL_TYPE_INTEGER, 860 .def = MEM2MEM_DEF_TRANSTIME, 861 .min = 1, 862 .max = 10001, 863 .step = 1, 864}; 865 866static const struct v4l2_ctrl_config vim2m_ctrl_trans_num_bufs = { 867 .ops = &vim2m_ctrl_ops, 868 .id = V4L2_CID_TRANS_NUM_BUFS, 869 .name = "Buffers Per Transaction", 870 .type = V4L2_CTRL_TYPE_INTEGER, 871 .def = 1, 872 .min = 1, 873 .max = MEM2MEM_DEF_NUM_BUFS, 874 .step = 1, 875}; 876 877/* 878 * File operations 879 */ 880static int vim2m_open(struct file *file) 881{ 882 struct vim2m_dev *dev = video_drvdata(file); 883 struct vim2m_ctx *ctx = NULL; 884 struct v4l2_ctrl_handler *hdl; 885 int rc = 0; 886 887 if (mutex_lock_interruptible(&dev->dev_mutex)) 888 return -ERESTARTSYS; 889 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 890 if (!ctx) { 891 rc = -ENOMEM; 892 goto open_unlock; 893 } 894 895 v4l2_fh_init(&ctx->fh, video_devdata(file)); 896 file->private_data = &ctx->fh; 897 ctx->dev = dev; 898 hdl = &ctx->hdl; 899 v4l2_ctrl_handler_init(hdl, 4); 900 v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0); 901 v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0); 902 v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_time_msec, NULL); 903 v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_num_bufs, NULL); 904 if (hdl->error) { 905 rc = hdl->error; 906 v4l2_ctrl_handler_free(hdl); 907 goto open_unlock; 908 } 909 ctx->fh.ctrl_handler = hdl; 910 v4l2_ctrl_handler_setup(hdl); 911 912 ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0]; 913 ctx->q_data[V4L2_M2M_SRC].width = 640; 914 ctx->q_data[V4L2_M2M_SRC].height = 480; 915 ctx->q_data[V4L2_M2M_SRC].sizeimage = 916 ctx->q_data[V4L2_M2M_SRC].width * 917 ctx->q_data[V4L2_M2M_SRC].height * 918 (ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3); 919 ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC]; 920 ctx->colorspace = V4L2_COLORSPACE_REC709; 921 922 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init); 923 924 if (IS_ERR(ctx->fh.m2m_ctx)) { 925 rc = PTR_ERR(ctx->fh.m2m_ctx); 926 927 v4l2_ctrl_handler_free(hdl); 928 kfree(ctx); 929 goto open_unlock; 930 } 931 932 v4l2_fh_add(&ctx->fh); 933 atomic_inc(&dev->num_inst); 934 935 dprintk(dev, "Created instance: %p, m2m_ctx: %p\n", 936 ctx, ctx->fh.m2m_ctx); 937 938open_unlock: 939 mutex_unlock(&dev->dev_mutex); 940 return rc; 941} 942 943static int vim2m_release(struct file *file) 944{ 945 struct vim2m_dev *dev = video_drvdata(file); 946 struct vim2m_ctx *ctx = file2ctx(file); 947 948 dprintk(dev, "Releasing instance %p\n", ctx); 949 950 v4l2_fh_del(&ctx->fh); 951 v4l2_fh_exit(&ctx->fh); 952 v4l2_ctrl_handler_free(&ctx->hdl); 953 mutex_lock(&dev->dev_mutex); 954 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); 955 mutex_unlock(&dev->dev_mutex); 956 kfree(ctx); 957 958 atomic_dec(&dev->num_inst); 959 960 return 0; 961} 962 963static const struct v4l2_file_operations vim2m_fops = { 964 .owner = THIS_MODULE, 965 .open = vim2m_open, 966 .release = vim2m_release, 967 .poll = v4l2_m2m_fop_poll, 968 .unlocked_ioctl = video_ioctl2, 969 .mmap = v4l2_m2m_fop_mmap, 970}; 971 972static struct video_device vim2m_videodev = { 973 .name = MEM2MEM_NAME, 974 .vfl_dir = VFL_DIR_M2M, 975 .fops = &vim2m_fops, 976 .ioctl_ops = &vim2m_ioctl_ops, 977 .minor = -1, 978 .release = video_device_release_empty, 979}; 980 981static struct v4l2_m2m_ops m2m_ops = { 982 .device_run = device_run, 983 .job_ready = job_ready, 984 .job_abort = job_abort, 985}; 986 987static int vim2m_probe(struct platform_device *pdev) 988{ 989 struct vim2m_dev *dev; 990 struct video_device *vfd; 991 int ret; 992 993 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 994 if (!dev) 995 return -ENOMEM; 996 997 spin_lock_init(&dev->irqlock); 998 999 ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev); 1000 if (ret) 1001 return ret; 1002 1003 atomic_set(&dev->num_inst, 0); 1004 mutex_init(&dev->dev_mutex); 1005 1006 dev->vfd = vim2m_videodev; 1007 vfd = &dev->vfd; 1008 vfd->lock = &dev->dev_mutex; 1009 vfd->v4l2_dev = &dev->v4l2_dev; 1010 1011 ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); 1012 if (ret) { 1013 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); 1014 goto unreg_dev; 1015 } 1016 1017 video_set_drvdata(vfd, dev); 1018 snprintf(vfd->name, sizeof(vfd->name), "%s", vim2m_videodev.name); 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); 1037unreg_dev: 1038 v4l2_device_unregister(&dev->v4l2_dev); 1039 1040 return ret; 1041} 1042 1043static int vim2m_remove(struct platform_device *pdev) 1044{ 1045 struct vim2m_dev *dev = platform_get_drvdata(pdev); 1046 1047 v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_NAME); 1048 v4l2_m2m_release(dev->m2m_dev); 1049 del_timer_sync(&dev->timer); 1050 video_unregister_device(&dev->vfd); 1051 v4l2_device_unregister(&dev->v4l2_dev); 1052 1053 return 0; 1054} 1055 1056static struct platform_driver vim2m_pdrv = { 1057 .probe = vim2m_probe, 1058 .remove = vim2m_remove, 1059 .driver = { 1060 .name = MEM2MEM_NAME, 1061 }, 1062}; 1063 1064static void __exit vim2m_exit(void) 1065{ 1066 platform_driver_unregister(&vim2m_pdrv); 1067 platform_device_unregister(&vim2m_pdev); 1068} 1069 1070static int __init vim2m_init(void) 1071{ 1072 int ret; 1073 1074 ret = platform_device_register(&vim2m_pdev); 1075 if (ret) 1076 return ret; 1077 1078 ret = platform_driver_register(&vim2m_pdrv); 1079 if (ret) 1080 platform_device_unregister(&vim2m_pdev); 1081 1082 return 0; 1083} 1084 1085module_init(vim2m_init); 1086module_exit(vim2m_exit); 1087