video.c revision 1.1
1 /* $NetBSD: video.c,v 1.1 2008/09/06 19:00:54 jmcneill Exp $ */ 2 3 /* 4 * Copyright (c) 2008 Patrick Mahoney <pat (at) polycrystal.org> 5 * All rights reserved. 6 * 7 * This code was written by Patrick Mahoney (pat (at) polycrystal.org) as 8 * part of Google Summer of Code 2008. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * This ia a Video4Linux 2 compatible /dev/video driver for NetBSD 34 * 35 * See http://v4l2spec.bytesex.org/ for Video4Linux 2 specifications 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: video.c,v 1.1 2008/09/06 19:00:54 jmcneill Exp $"); 40 41 #include "video.h" 42 #if NVIDEO > 0 43 44 #include <sys/param.h> 45 #include <sys/ioctl.h> 46 #include <sys/fcntl.h> 47 #include <sys/vnode.h> 48 #include <sys/poll.h> 49 #include <sys/kmem.h> 50 #include <sys/pool.h> 51 #include <sys/conf.h> 52 #include <sys/types.h> 53 #include <sys/device.h> 54 #include <sys/condvar.h> 55 #include <sys/queue.h> 56 #include <sys/videoio.h> 57 58 #include <dev/video_if.h> 59 60 /* #define VIDEO_DEBUG 1 */ 61 62 #ifdef VIDEO_DEBUG 63 #define DPRINTF(x) do { if (videodebug) printf x; } while (0) 64 #define DPRINTFN(n,x) do { if (videodebug>(n)) printf x; } while (0) 65 int videodebug = VIDEO_DEBUG; 66 #else 67 #define DPRINTF(x) 68 #define DPRINTFN(n,x) 69 #endif 70 71 #define VIDEO_DRIVER_VERSION 1 72 73 /* TODO: move to sys/intr.h */ 74 #define IPL_VIDEO IPL_VM 75 #define splvideo() splvm() 76 77 #define VIDEO_MIN_BUFS 2 78 #define VIDEO_MAX_BUFS 255 79 #define VIDEO_NUM_BUFS 4 80 81 /* Scatter Buffer - an array of fixed size (PAGE_SIZE) chunks 82 * allocated non-contiguously and functions to get data into and out 83 * of the scatter buffer. */ 84 struct scatter_buf { 85 pool_cache_t sb_pool; 86 size_t sb_size; /* size in bytes */ 87 size_t sb_npages; /* number of pages */ 88 uint8_t **sb_page_ary; /* array of page pointers */ 89 }; 90 91 struct scatter_io { 92 struct scatter_buf *sio_buf; 93 off_t sio_offset; 94 size_t sio_resid; 95 }; 96 97 static void scatter_buf_init(struct scatter_buf *); 98 static void scatter_buf_destroy(struct scatter_buf *); 99 static int scatter_buf_set_size(struct scatter_buf *, size_t); 100 static paddr_t scatter_buf_map(struct scatter_buf *, off_t); 101 102 static bool scatter_io_init(struct scatter_buf *, off_t, size_t, struct scatter_io *); 103 static bool scatter_io_next(struct scatter_io *, void **, size_t *); 104 static void scatter_io_undo(struct scatter_io *, size_t); 105 static void scatter_io_copyin(struct scatter_io *, const void *); 106 /* static void scatter_io_copyout(struct scatter_io *, void *); */ 107 static int scatter_io_uiomove(struct scatter_io *, struct uio *); 108 109 110 enum video_stream_method { 111 VIDEO_STREAM_METHOD_NONE, 112 VIDEO_STREAM_METHOD_READ, 113 VIDEO_STREAM_METHOD_MMAP, 114 VIDEO_STREAM_METHOD_USERPTR 115 }; 116 117 struct video_buffer { 118 struct v4l2_buffer *vb_buf; 119 SIMPLEQ_ENTRY(video_buffer) entries; 120 }; 121 122 SIMPLEQ_HEAD(sample_queue, video_buffer); 123 124 struct video_stream { 125 int vs_flags; /* flags given to open() */ 126 127 struct video_format vs_format; 128 129 int vs_frameno; /* toggles between 0 and 1, 130 * or -1 if new */ 131 uint32_t vs_sequence; /* absoulte frame/sample number in 132 * sequence, wraps around */ 133 bool vs_drop; /* drop payloads from current 134 * frameno? */ 135 136 enum v4l2_buf_type vs_type; 137 uint8_t vs_nbufs; 138 struct video_buffer **vs_buf; 139 140 struct scatter_buf vs_data; /* stores video data for MMAP 141 * and READ */ 142 143 /* Video samples may exist in different locations. Initially, 144 * samples are queued into the ingress queue. The driver 145 * grabs these in turn and fills them with video data. Once 146 * filled, they are moved to the egress queue. Samples are 147 * dequeued either by user with MMAP method or, with READ 148 * method, videoread() works from the fist sample in the 149 * ingress queue without dequeing. In the first case, the 150 * user re-queues the buffer when finished, and videoread() 151 * does the same when all data has been read. The sample now 152 * returns to the ingress queue. */ 153 struct sample_queue vs_ingress; /* samples under driver control */ 154 struct sample_queue vs_egress; /* samples headed for userspace */ 155 156 bool vs_streaming; 157 enum video_stream_method vs_method; /* method by which 158 * userspace will read 159 * samples */ 160 161 kmutex_t vs_lock; /* Lock to manipulate queues. 162 * Should also be held when 163 * changing number of 164 * buffers. */ 165 kcondvar_t vs_sample_cv; /* signaled on new 166 * ingress sample */ 167 168 uint32_t vs_bytesread; /* bytes read() from current 169 * sample thus far */ 170 }; 171 172 struct video_softc { 173 device_t sc_dev; 174 device_t hw_dev; /* Hardware (parent) device */ 175 void * hw_softc; /* Hardware device private softc */ 176 const struct video_hw_if *hw_if; /* Hardware interface */ 177 178 u_int sc_open; 179 int sc_refcnt; 180 int sc_opencnt; 181 bool sc_dying; 182 183 struct video_stream sc_stream_in; 184 }; 185 static int video_print(void *, const char *); 186 187 static int video_match(device_t, cfdata_t, void *); 188 static void video_attach(device_t, device_t, void *); 189 static int video_detach(device_t, int); 190 static int video_activate(device_t, enum devact); 191 192 dev_type_open(videoopen); 193 dev_type_close(videoclose); 194 dev_type_read(videoread); 195 dev_type_write(videowrite); 196 dev_type_ioctl(videoioctl); 197 dev_type_poll(videopoll); 198 dev_type_mmap(videommap); 199 200 const struct cdevsw video_cdevsw = { 201 videoopen, videoclose, videoread, videowrite, videoioctl, 202 nostop, notty, videopoll, videommap, nokqfilter, D_OTHER 203 }; 204 205 #define VIDEOUNIT(n) (minor(n)) 206 207 CFATTACH_DECL_NEW(video, sizeof(struct video_softc), 208 video_match, video_attach, video_detach, video_activate); 209 210 extern struct cfdriver video_cd; 211 212 static const char * video_pixel_format_str(enum video_pixel_format); 213 214 /* convert various values from V4L2 to native values of this driver */ 215 static uint16_t v4l2id_to_control_id(uint32_t); 216 static uint32_t control_flags_to_v4l2flags(uint32_t); 217 static enum v4l2_ctrl_type control_type_to_v4l2type(enum video_control_type); 218 219 static void v4l2_format_to_video_format(const struct v4l2_format *, 220 struct video_format *); 221 static void video_format_to_v4l2_format(const struct video_format *, 222 struct v4l2_format *); 223 224 /* V4L2 api functions, typically called from videoioclt() */ 225 static int video_enum_format(struct video_softc *, struct v4l2_fmtdesc *); 226 static int video_get_format(struct video_softc *, 227 struct v4l2_format *); 228 static int video_set_format(struct video_softc *, 229 struct v4l2_format *); 230 static int video_try_format(struct video_softc *, 231 struct v4l2_format *); 232 static int video_query_control(struct video_softc *, 233 struct v4l2_queryctrl *); 234 static int video_get_control(struct video_softc *, 235 struct v4l2_control *); 236 static int video_set_control(struct video_softc *, 237 const struct v4l2_control *); 238 static int video_request_bufs(struct video_softc *, 239 struct v4l2_requestbuffers *); 240 static int video_query_buf(struct video_softc *, struct v4l2_buffer *); 241 static int video_queue_buf(struct video_softc *, struct v4l2_buffer *); 242 static int video_dequeue_buf(struct video_softc *, struct v4l2_buffer *); 243 static int video_stream_on(struct video_softc *, enum v4l2_buf_type); 244 static int video_stream_off(struct video_softc *, enum v4l2_buf_type); 245 246 static struct video_buffer * video_buffer_alloc(void); 247 static void video_buffer_free(struct video_buffer *); 248 249 250 /* functions for video_stream */ 251 static void video_stream_init(struct video_stream *); 252 static void video_stream_fini(struct video_stream *); 253 254 static int video_stream_setup_bufs(struct video_stream *, 255 enum video_stream_method, 256 uint8_t); 257 static void video_stream_teardown_bufs(struct video_stream *); 258 259 static int video_stream_realloc_bufs(struct video_stream *, uint8_t); 260 #define video_stream_free_bufs(vs) \ 261 video_stream_realloc_bufs((vs), 0) 262 263 static void video_stream_enqueue(struct video_stream *, 264 struct video_buffer *); 265 static struct video_buffer * video_stream_dequeue(struct video_stream *); 266 static void video_stream_write(struct video_stream *, 267 const struct video_payload *); 268 static void video_stream_sample_done(struct video_stream *); 269 270 #ifdef VIDEO_DEBUG 271 /* debugging */ 272 static const char * video_ioctl_str(u_long); 273 #endif 274 275 276 static int 277 video_match(device_t parent, cfdata_t match, void *aux) 278 { 279 struct video_attach_args *args; 280 281 args = aux; 282 DPRINTF(("video_match: hw=%p\n", args->hw_if)); 283 return 1; 284 } 285 286 287 static void 288 video_attach(device_t parent, device_t self, void *aux) 289 { 290 struct video_softc *sc; 291 struct video_attach_args *args; 292 293 sc = device_private(self); 294 args = aux; 295 296 sc->sc_dev = self; 297 sc->hw_dev = parent; 298 sc->hw_if = args->hw_if; 299 sc->hw_softc = device_private(parent); 300 301 sc->sc_open = 0; 302 sc->sc_refcnt = 0; 303 sc->sc_opencnt = 0; 304 sc->sc_dying = false; 305 306 video_stream_init(&sc->sc_stream_in); 307 308 DPRINTF(("video_attach: sc=%p hwif=%p\n", sc, sc->hw_if)); 309 } 310 311 312 static int 313 video_activate(device_t self, enum devact act) 314 { 315 struct video_softc *sc; 316 317 sc = device_private(self); 318 DPRINTF(("video_activate: sc=%p\n", sc)); 319 switch (act) { 320 case DVACT_ACTIVATE: 321 return EOPNOTSUPP; 322 323 case DVACT_DEACTIVATE: 324 sc->sc_dying = true; 325 break; 326 } 327 return 0; 328 } 329 330 331 static int 332 video_detach(device_t self, int flags) 333 { 334 struct video_softc *sc; 335 int maj, mn; 336 337 sc = device_private(self); 338 DPRINTF(("video_detach: sc=%p flags=%d\n", sc, flags)); 339 340 sc->sc_dying = true; 341 342 maj = cdevsw_lookup_major(&video_cdevsw); 343 mn = device_unit(self); 344 /* close open instances */ 345 vdevgone(maj, mn, mn, VCHR); 346 347 video_stream_fini(&sc->sc_stream_in); 348 349 return 0; 350 } 351 352 353 static int 354 video_print(void *aux, const char *pnp) 355 { 356 struct video_attach_args *arg; 357 358 if (pnp != NULL) { 359 DPRINTF(("video_print: have pnp\n")); 360 arg = aux; 361 aprint_normal("%s at %s\n", "video", pnp); 362 } else { 363 DPRINTF(("video_print: pnp is NULL\n")); 364 } 365 return UNCONF; 366 } 367 368 369 /* 370 * Called from hardware driver. This is where the MI audio driver 371 * gets probed/attached to the hardware driver. 372 */ 373 device_t 374 video_attach_mi(const struct video_hw_if *hw_if, device_t parent) 375 { 376 struct video_attach_args args; 377 378 args.hw_if = hw_if; 379 return config_found_ia(parent, "videobus", &args, video_print); 380 } 381 382 /* video_submit_payload - called by hardware driver to submit payload data */ 383 void 384 video_submit_payload(device_t self, const struct video_payload *payload) 385 { 386 struct video_softc *sc; 387 388 sc = device_private(self); 389 390 if (sc == NULL) 391 return; 392 393 video_stream_write(&sc->sc_stream_in, payload); 394 } 395 396 static const char * 397 video_pixel_format_str(enum video_pixel_format px) 398 { 399 switch (px) { 400 case VIDEO_FORMAT_YUY2: return "YUYV"; 401 case VIDEO_FORMAT_NV12: return "NV12"; 402 case VIDEO_FORMAT_MJPEG: return "MJPEG"; 403 case VIDEO_FORMAT_DV: return "DV"; 404 case VIDEO_FORMAT_MPEG: return "MPEG"; 405 default: return "Unknown"; 406 } 407 } 408 409 /* Takes a V4L2 id and returns a "native" video driver control id. 410 * TODO: is there a better way to do this? some kind of array? */ 411 static uint16_t 412 v4l2id_to_control_id(uint32_t v4l2id) 413 { 414 /* mask includes class bits and control id bits */ 415 switch (v4l2id & 0xffffff) { 416 case V4L2_CID_BRIGHTNESS: return VIDEO_CONTROL_BRIGHTNESS; 417 case V4L2_CID_CONTRAST: return VIDEO_CONTROL_CONTRAST; 418 case V4L2_CID_SATURATION: return VIDEO_CONTROL_SATURATION; 419 case V4L2_CID_HUE: return VIDEO_CONTROL_HUE; 420 case V4L2_CID_HUE_AUTO: return VIDEO_CONTROL_HUE_AUTO; 421 case V4L2_CID_SHARPNESS: return VIDEO_CONTROL_SHARPNESS; 422 case V4L2_CID_GAMMA: return VIDEO_CONTROL_GAMMA; 423 424 /* "black level" means the same as "brightness", but V4L2 425 * defines two separate controls that are not identical. 426 * V4L2_CID_BLACK_LEVEL is deprecated however in V4L2. */ 427 case V4L2_CID_BLACK_LEVEL: return VIDEO_CONTROL_BRIGHTNESS; 428 429 case V4L2_CID_AUDIO_VOLUME: return VIDEO_CONTROL_UNDEFINED; 430 case V4L2_CID_AUDIO_BALANCE: return VIDEO_CONTROL_UNDEFINED; 431 case V4L2_CID_AUDIO_BASS: return VIDEO_CONTROL_UNDEFINED; 432 case V4L2_CID_AUDIO_TREBLE: return VIDEO_CONTROL_UNDEFINED; 433 case V4L2_CID_AUDIO_MUTE: return VIDEO_CONTROL_UNDEFINED; 434 case V4L2_CID_AUDIO_LOUDNESS: return VIDEO_CONTROL_UNDEFINED; 435 436 case V4L2_CID_AUTO_WHITE_BALANCE: 437 return VIDEO_CONTROL_WHITE_BALANCE_AUTO; 438 case V4L2_CID_DO_WHITE_BALANCE: 439 return VIDEO_CONTROL_WHITE_BALANCE_ACTION; 440 case V4L2_CID_RED_BALANCE: 441 case V4L2_CID_BLUE_BALANCE: 442 /* This might not fit in with the control_id/value_id scheme */ 443 return VIDEO_CONTROL_WHITE_BALANCE_COMPONENT; 444 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: 445 return VIDEO_CONTROL_WHITE_BALANCE_TEMPERATURE; 446 case V4L2_CID_EXPOSURE: 447 return VIDEO_CONTROL_EXPOSURE_TIME_ABSOLUTE; 448 case V4L2_CID_GAIN: return VIDEO_CONTROL_GAIN; 449 case V4L2_CID_AUTOGAIN: return VIDEO_CONTROL_GAIN_AUTO; 450 case V4L2_CID_HFLIP: return VIDEO_CONTROL_HFLIP; 451 case V4L2_CID_VFLIP: return VIDEO_CONTROL_VFLIP; 452 case V4L2_CID_HCENTER_DEPRECATED: 453 case V4L2_CID_VCENTER_DEPRECATED: 454 return VIDEO_CONTROL_UNDEFINED; 455 case V4L2_CID_POWER_LINE_FREQUENCY: 456 return VIDEO_CONTROL_POWER_LINE_FREQUENCY; 457 case V4L2_CID_BACKLIGHT_COMPENSATION: 458 return VIDEO_CONTROL_BACKLIGHT_COMPENSATION; 459 default: return V4L2_CTRL_ID2CID(v4l2id); 460 } 461 } 462 463 464 static uint32_t 465 control_flags_to_v4l2flags(uint32_t flags) 466 { 467 uint32_t v4l2flags = 0; 468 469 if (flags & VIDEO_CONTROL_FLAG_DISABLED) 470 v4l2flags |= V4L2_CTRL_FLAG_INACTIVE; 471 472 if (!(flags & VIDEO_CONTROL_FLAG_WRITE)) 473 v4l2flags |= V4L2_CTRL_FLAG_READ_ONLY; 474 475 if (flags & VIDEO_CONTROL_FLAG_AUTOUPDATE) 476 v4l2flags |= V4L2_CTRL_FLAG_GRABBED; 477 478 return v4l2flags; 479 } 480 481 482 static enum v4l2_ctrl_type 483 control_type_to_v4l2type(enum video_control_type type) { 484 switch (type) { 485 case VIDEO_CONTROL_TYPE_INT: return V4L2_CTRL_TYPE_INTEGER; 486 case VIDEO_CONTROL_TYPE_BOOL: return V4L2_CTRL_TYPE_BOOLEAN; 487 case VIDEO_CONTROL_TYPE_LIST: return V4L2_CTRL_TYPE_MENU; 488 case VIDEO_CONTROL_TYPE_ACTION: return V4L2_CTRL_TYPE_BUTTON; 489 default: return V4L2_CTRL_TYPE_INTEGER; /* err? */ 490 } 491 } 492 493 494 static int 495 video_query_control(struct video_softc *sc, 496 struct v4l2_queryctrl *query) 497 { 498 const struct video_hw_if *hw; 499 struct video_control_desc_group desc_group; 500 struct video_control_desc desc; 501 int err; 502 503 hw = sc->hw_if; 504 if (hw->get_control_desc_group) { 505 desc.group_id = desc.control_id = 506 v4l2id_to_control_id(query->id); 507 508 desc_group.group_id = desc.group_id; 509 desc_group.length = 1; 510 desc_group.desc = &desc; 511 512 err = hw->get_control_desc_group(sc->hw_softc, &desc_group); 513 if (err != 0) 514 return err; 515 516 query->type = control_type_to_v4l2type(desc.type); 517 memcpy(query->name, desc.name, 32); 518 query->minimum = desc.min; 519 query->maximum = desc.max; 520 query->step = desc.step; 521 query->default_value = desc.def; 522 query->flags = control_flags_to_v4l2flags(desc.flags); 523 524 return 0; 525 } else { 526 return EINVAL; 527 } 528 } 529 530 531 /* Takes a single Video4Linux2 control and queries the driver for the 532 * current value. */ 533 static int 534 video_get_control(struct video_softc *sc, 535 struct v4l2_control *vcontrol) 536 { 537 const struct video_hw_if *hw; 538 struct video_control_group group; 539 struct video_control control; 540 int err; 541 542 hw = sc->hw_if; 543 if (hw->get_control_group) { 544 control.group_id = control.control_id = 545 v4l2id_to_control_id(vcontrol->id); 546 /* ?? if "control_id" is arbitrarily defined by the 547 * driver, then we need some way to store it... Maybe 548 * it doesn't matter for single value controls. */ 549 control.value = 0; 550 551 group.group_id = control.group_id; 552 group.length = 1; 553 group.control = &control; 554 555 err = hw->get_control_group(sc->hw_softc, &group); 556 if (err != 0) 557 return err; 558 559 vcontrol->value = control.value; 560 return 0; 561 } else { 562 return EINVAL; 563 } 564 } 565 566 static void 567 video_format_to_v4l2_format(const struct video_format *src, 568 struct v4l2_format *dest) 569 { 570 /* TODO: what about win and vbi formats? */ 571 dest->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 572 dest->fmt.pix.width = src->width; 573 dest->fmt.pix.height = src->height; 574 dest->fmt.pix.field = V4L2_FIELD_NONE; /* TODO: for now, 575 * just set to 576 * progressive */ 577 dest->fmt.pix.bytesperline = src->stride; 578 dest->fmt.pix.sizeimage = src->sample_size; 579 /* dest->colorspace = */ 580 581 switch (src->pixel_format) { 582 case VIDEO_FORMAT_YUY2: 583 dest->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; 584 break; 585 case VIDEO_FORMAT_NV12: 586 dest->fmt.pix.pixelformat = V4L2_PIX_FMT_NV12; 587 break; 588 case VIDEO_FORMAT_MJPEG: 589 dest->fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG; 590 break; 591 case VIDEO_FORMAT_DV: 592 dest->fmt.pix.pixelformat = V4L2_PIX_FMT_DV; 593 break; 594 case VIDEO_FORMAT_MPEG: 595 dest->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG; 596 break; 597 case VIDEO_FORMAT_UNDEFINED: 598 default: 599 DPRINTF(("video_get_format: unknown pixel format %d\n", 600 src->pixel_format)); 601 dest->fmt.pix.pixelformat = 0; /* V4L2 doesn't define 602 * and "undefined" 603 * format? */ 604 break; 605 } 606 607 } 608 609 static void 610 v4l2_format_to_video_format(const struct v4l2_format *src, 611 struct video_format *dest) 612 { 613 switch (src->type) { 614 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 615 dest->width = src->fmt.pix.width; 616 dest->height = src->fmt.pix.height; 617 618 dest->stride = src->fmt.pix.bytesperline; 619 dest->sample_size = src->fmt.pix.sizeimage; 620 621 switch (src->fmt.pix.pixelformat) { 622 case V4L2_PIX_FMT_YUYV: 623 dest->pixel_format = VIDEO_FORMAT_YUY2; 624 break; 625 case V4L2_PIX_FMT_NV12: 626 dest->pixel_format = VIDEO_FORMAT_NV12; 627 break; 628 case V4L2_PIX_FMT_JPEG: 629 dest->pixel_format = VIDEO_FORMAT_MJPEG; 630 break; 631 case V4L2_PIX_FMT_DV: 632 dest->pixel_format = VIDEO_FORMAT_DV; 633 break; 634 case V4L2_PIX_FMT_MPEG: 635 dest->pixel_format = VIDEO_FORMAT_MJPEG; 636 break; 637 default: 638 DPRINTF(("video: unknown v4l2 pixel format %d\n", 639 src->fmt.pix.pixelformat)); 640 dest->pixel_format = VIDEO_FORMAT_UNDEFINED; 641 break; 642 } 643 break; 644 default: 645 /* TODO: other v4l2 format types */ 646 DPRINTF(("video: unsupported v4l2 format type %d\n", 647 src->type)); 648 break; 649 } 650 } 651 652 static int 653 video_enum_format(struct video_softc *sc, struct v4l2_fmtdesc *fmtdesc) 654 { 655 const struct video_hw_if *hw; 656 struct video_format vfmt; 657 struct v4l2_format fmt; 658 int err; 659 660 hw = sc->hw_if; 661 if (hw->enum_format == NULL) 662 return EINVAL; 663 664 err = hw->enum_format(sc->hw_softc, fmtdesc->index, &vfmt); 665 if (err != 0) 666 return err; 667 668 video_format_to_v4l2_format(&vfmt, &fmt); 669 670 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; /* TODO: only one type for now */ 671 if (vfmt.pixel_format >= VIDEO_FORMAT_MJPEG) 672 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED; 673 strlcpy(fmtdesc->description, 674 video_pixel_format_str(vfmt.pixel_format), 675 sizeof(fmtdesc->description)); 676 fmtdesc->pixelformat = fmt.fmt.pix.pixelformat; 677 678 return 0; 679 } 680 681 static int 682 video_get_format(struct video_softc *sc, 683 struct v4l2_format *format) 684 { 685 const struct video_hw_if *hw; 686 struct video_format vfmt; 687 int err; 688 689 hw = sc->hw_if; 690 if (hw->get_format == NULL) 691 return EINVAL; 692 693 err = hw->get_format(sc->hw_softc, &vfmt); 694 if (err != 0) 695 return err; 696 697 video_format_to_v4l2_format(&vfmt, format); 698 699 return 0; 700 } 701 702 static int 703 video_set_format(struct video_softc *sc, struct v4l2_format *fmt) 704 { 705 const struct video_hw_if *hw; 706 struct video_format vfmt; 707 int err; 708 709 hw = sc->hw_if; 710 if (hw->get_format == NULL) 711 return EINVAL; 712 713 v4l2_format_to_video_format(fmt, &vfmt); 714 715 err = hw->set_format(sc->hw_softc, &vfmt); 716 if (err != 0) 717 return err; 718 719 video_format_to_v4l2_format(&vfmt, fmt); 720 721 return 0; 722 } 723 724 725 static int 726 video_try_format(struct video_softc *sc, 727 struct v4l2_format *format) 728 { 729 const struct video_hw_if *hw; 730 struct video_format vfmt; 731 int err; 732 733 hw = sc->hw_if; 734 if (hw->try_format == NULL) 735 return EINVAL; 736 737 v4l2_format_to_video_format(format, &vfmt); 738 739 err = hw->try_format(sc->hw_softc, &vfmt); 740 if (err != 0) 741 return err; 742 743 video_format_to_v4l2_format(&vfmt, format); 744 745 return 0; 746 } 747 748 /* Takes a single Video4Linux2 control, converts it to a struct 749 * video_control, and calls the hardware driver. */ 750 static int 751 video_set_control(struct video_softc *sc, 752 const struct v4l2_control *vcontrol) 753 { 754 const struct video_hw_if *hw; 755 struct video_control_group group; 756 struct video_control control; 757 758 hw = sc->hw_if; 759 if (hw->set_control_group) { 760 control.group_id = control.control_id = 761 v4l2id_to_control_id(vcontrol->id); 762 /* ?? if "control_id" is arbitrarily defined by the 763 * driver, then we need some way to store it... Maybe 764 * it doesn't matter for single value controls. */ 765 control.value = vcontrol->value; 766 767 group.group_id = control.group_id; 768 group.length = 1; 769 group.control = &control; 770 771 return (hw->set_control_group(sc->hw_softc, &group)); 772 } else { 773 return EINVAL; 774 } 775 } 776 777 static int 778 video_request_bufs(struct video_softc *sc, 779 struct v4l2_requestbuffers *req) 780 { 781 struct video_stream *vs = &sc->sc_stream_in; 782 struct v4l2_buffer *buf; 783 int i, err; 784 785 if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 786 return EINVAL; 787 788 vs->vs_type = req->type; 789 790 switch (req->memory) { 791 case V4L2_MEMORY_MMAP: 792 if (req->count < VIDEO_MIN_BUFS) 793 req->count = VIDEO_MIN_BUFS; 794 else if (req->count > VIDEO_MAX_BUFS) 795 req->count = VIDEO_MAX_BUFS; 796 797 err = video_stream_setup_bufs(vs, 798 VIDEO_STREAM_METHOD_MMAP, 799 req->count); 800 if (err != 0) 801 return err; 802 803 for (i = 0; i < req->count; ++i) { 804 buf = vs->vs_buf[i]->vb_buf; 805 buf->memory = V4L2_MEMORY_MMAP; 806 buf->flags |= V4L2_BUF_FLAG_MAPPED; 807 } 808 break; 809 case V4L2_MEMORY_USERPTR: 810 default: 811 return EINVAL; 812 } 813 814 return 0; 815 } 816 817 static int 818 video_query_buf(struct video_softc *sc, 819 struct v4l2_buffer *buf) 820 { 821 struct video_stream *vs = &sc->sc_stream_in; 822 823 if (buf->type != vs->vs_type) 824 return EINVAL; 825 if (buf->index >= vs->vs_nbufs) 826 return EINVAL; 827 828 memcpy(buf, vs->vs_buf[buf->index]->vb_buf, sizeof(*buf)); 829 830 return 0; 831 } 832 833 /* Accept a buffer descriptor from userspace and return the indicated 834 * buffer to the driver's queue. */ 835 static int 836 video_queue_buf(struct video_softc *sc, struct v4l2_buffer *userbuf) 837 { 838 struct video_stream *vs = &sc->sc_stream_in; 839 struct video_buffer *vb; 840 struct v4l2_buffer *driverbuf; 841 842 if (userbuf->type != vs->vs_type) { 843 DPRINTF(("video_queue_buf: expected type=%d got type=%d\n", 844 userbuf->type, vs->vs_type)); 845 return EINVAL; 846 } 847 if (userbuf->index >= vs->vs_nbufs) { 848 DPRINTF(("video_queue_buf: invalid index %d >= %d\n", 849 userbuf->index, vs->vs_nbufs)); 850 return EINVAL; 851 } 852 853 switch (vs->vs_method) { 854 case VIDEO_STREAM_METHOD_MMAP: 855 if (userbuf->memory != V4L2_MEMORY_MMAP) { 856 DPRINTF(("video_queue_buf: invalid memory=%d\n", 857 userbuf->memory)); 858 return EINVAL; 859 } 860 861 mutex_enter(&vs->vs_lock); 862 863 vb = vs->vs_buf[userbuf->index]; 864 driverbuf = vb->vb_buf; 865 if (driverbuf->flags & V4L2_BUF_FLAG_QUEUED) { 866 DPRINTF(("video_queue_buf: buf already queued; " 867 "flags=0x%x\n", driverbuf->flags)); 868 mutex_exit(&vs->vs_lock); 869 return EINVAL; 870 } 871 video_stream_enqueue(vs, vb); 872 memcpy(userbuf, driverbuf, sizeof(*driverbuf)); 873 874 mutex_exit(&vs->vs_lock); 875 break; 876 default: 877 return EINVAL; 878 } 879 880 return 0; 881 } 882 883 /* Dequeue the described buffer from the driver queue, making it 884 * available for reading via mmap. */ 885 static int 886 video_dequeue_buf(struct video_softc *sc, struct v4l2_buffer *buf) 887 { 888 struct video_stream *vs = &sc->sc_stream_in; 889 struct video_buffer *vb; 890 int err; 891 892 if (buf->type != vs->vs_type) 893 return EINVAL; 894 895 switch (vs->vs_method) { 896 case VIDEO_STREAM_METHOD_MMAP: 897 if (buf->memory != V4L2_MEMORY_MMAP) 898 return EINVAL; 899 900 mutex_enter(&vs->vs_lock); 901 902 if (vs->vs_flags & O_NONBLOCK) { 903 vb = video_stream_dequeue(vs); 904 if (vb == NULL) { 905 mutex_exit(&vs->vs_lock); 906 return EAGAIN; 907 } 908 } else { 909 /* Block until we have sample */ 910 while ((vb = video_stream_dequeue(vs)) == NULL) { 911 err = cv_wait_sig(&vs->vs_sample_cv, 912 &vs->vs_lock); 913 if (err != 0) { 914 mutex_exit(&vs->vs_lock); 915 return EINTR; 916 } 917 } 918 } 919 920 memcpy(buf, vb->vb_buf, sizeof(*buf)); 921 922 mutex_exit(&vs->vs_lock); 923 break; 924 default: 925 return EINVAL; 926 } 927 928 return 0; 929 } 930 931 static int 932 video_stream_on(struct video_softc *sc, enum v4l2_buf_type type) 933 { 934 int err; 935 struct video_stream *vs = &sc->sc_stream_in; 936 const struct video_hw_if *hw; 937 938 if (vs->vs_streaming) 939 return 0; 940 if (type != vs->vs_type) 941 return EINVAL; 942 943 hw = sc->hw_if; 944 if (hw == NULL) 945 return ENXIO; 946 947 948 err = hw->start_transfer(sc->hw_softc); 949 if (err != 0) 950 return err; 951 952 vs->vs_streaming = true; 953 return 0; 954 } 955 956 static int 957 video_stream_off(struct video_softc *sc, enum v4l2_buf_type type) 958 { 959 int err; 960 struct video_stream *vs = &sc->sc_stream_in; 961 const struct video_hw_if *hw; 962 963 if (!vs->vs_streaming) 964 return 0; 965 if (type != vs->vs_type) 966 return EINVAL; 967 968 hw = sc->hw_if; 969 if (hw == NULL) 970 return ENXIO; 971 972 err = hw->stop_transfer(sc->hw_softc); 973 if (err != 0) 974 return err; 975 976 vs->vs_frameno = -1; 977 vs->vs_sequence = 0; 978 vs->vs_streaming = false; 979 980 return 0; 981 } 982 983 int 984 videoopen(dev_t dev, int flags, int ifmt, struct lwp *l) 985 { 986 struct video_softc *sc; 987 const struct video_hw_if *hw; 988 struct video_stream *vs; 989 int err; 990 991 DPRINTF(("videoopen\n")); 992 993 sc = device_private(device_lookup(&video_cd, VIDEOUNIT(dev))); 994 if (sc == NULL) { 995 DPRINTF(("videoopen: failed to get softc\n")); 996 return ENXIO; 997 } 998 999 if (sc->sc_dying) { 1000 DPRINTF(("videoopen: dying\n")); 1001 return EIO; 1002 } 1003 1004 sc->sc_stream_in.vs_flags = flags; 1005 1006 DPRINTF(("videoopen: flags=0x%x sc=%p parent=%p\n", 1007 flags, sc, sc->hw_dev)); 1008 1009 hw = sc->hw_if; 1010 if (hw == NULL) 1011 return ENXIO; 1012 1013 device_active(sc->sc_dev, DVA_SYSTEM); 1014 1015 sc->sc_opencnt++; 1016 1017 if (hw->open != NULL) { 1018 err = hw->open(sc->hw_softc, flags); 1019 if (err) 1020 return err; 1021 } 1022 1023 /* set up input stream. TODO: check flags to determine if 1024 * "read" is desired? */ 1025 vs = &sc->sc_stream_in; 1026 1027 if (hw->set_format != NULL) { 1028 err = hw->set_format(sc->hw_softc, &vs->vs_format); 1029 if (err != 0) 1030 return err; 1031 } 1032 return 0; 1033 } 1034 1035 1036 int 1037 videoclose(dev_t dev, int flags, int ifmt, struct lwp *l) 1038 { 1039 struct video_softc *sc; 1040 const struct video_hw_if *hw; 1041 1042 sc = device_private(device_lookup(&video_cd, VIDEOUNIT(dev))); 1043 if (sc == NULL) 1044 return ENXIO; 1045 1046 DPRINTF(("videoclose: sc=%p\n", sc)); 1047 1048 hw = sc->hw_if; 1049 if (hw == NULL) 1050 return ENXIO; 1051 1052 device_active(sc->sc_dev, DVA_SYSTEM); 1053 1054 video_stream_off(sc, sc->sc_stream_in.vs_type); 1055 1056 /* ignore error */ 1057 if (hw->close != NULL) 1058 hw->close(sc->hw_softc); 1059 1060 video_stream_teardown_bufs(&sc->sc_stream_in); 1061 1062 sc->sc_open = 0; 1063 sc->sc_opencnt--; 1064 1065 return 0; 1066 } 1067 1068 1069 int 1070 videoread(dev_t dev, struct uio *uio, int ioflag) 1071 { 1072 struct video_softc *sc; 1073 struct video_stream *vs; 1074 struct video_buffer *vb; 1075 struct scatter_io sio; 1076 int err; 1077 size_t len; 1078 off_t offset; 1079 1080 sc = device_private(device_lookup(&video_cd, VIDEOUNIT(dev))); 1081 if (sc == NULL) 1082 return ENXIO; 1083 1084 if (sc->sc_dying) 1085 return EIO; 1086 1087 vs = &sc->sc_stream_in; 1088 1089 /* userspace has chosen read() method */ 1090 if (vs->vs_method == VIDEO_STREAM_METHOD_NONE) { 1091 err = video_stream_setup_bufs(vs, 1092 VIDEO_STREAM_METHOD_READ, 1093 VIDEO_NUM_BUFS); 1094 if (err != 0) 1095 return err; 1096 1097 err = video_stream_on(sc, vs->vs_type); 1098 if (err != 0) 1099 return err; 1100 } else if (vs->vs_method != VIDEO_STREAM_METHOD_READ) { 1101 return EBUSY; 1102 } 1103 1104 mutex_enter(&vs->vs_lock); 1105 1106 retry: 1107 if (SIMPLEQ_EMPTY(&vs->vs_egress)) { 1108 if (vs->vs_flags & O_NONBLOCK) { 1109 mutex_exit(&vs->vs_lock); 1110 return EAGAIN; 1111 } 1112 1113 /* Block until we have a sample */ 1114 while (SIMPLEQ_EMPTY(&vs->vs_egress)) { 1115 err = cv_wait_sig(&vs->vs_sample_cv, 1116 &vs->vs_lock); 1117 if (err != 0) { 1118 mutex_exit(&vs->vs_lock); 1119 return EINTR; 1120 } 1121 } 1122 1123 vb = SIMPLEQ_FIRST(&vs->vs_egress); 1124 } else { 1125 vb = SIMPLEQ_FIRST(&vs->vs_egress); 1126 } 1127 1128 /* Oops, empty sample buffer. */ 1129 if (vb->vb_buf->bytesused == 0) { 1130 vb = video_stream_dequeue(vs); 1131 video_stream_enqueue(vs, vb); 1132 vs->vs_bytesread = 0; 1133 goto retry; 1134 } 1135 1136 mutex_exit(&vs->vs_lock); 1137 1138 len = min(uio->uio_resid, vb->vb_buf->bytesused - vs->vs_bytesread); 1139 offset = vb->vb_buf->m.offset + vs->vs_bytesread; 1140 1141 if (scatter_io_init(&vs->vs_data, offset, len, &sio)) { 1142 err = scatter_io_uiomove(&sio, uio); 1143 if (err == EFAULT) 1144 return EFAULT; 1145 vs->vs_bytesread += (len - sio.sio_resid); 1146 } else { 1147 DPRINTF(("video: invalid read\n")); 1148 } 1149 1150 /* Move the sample to the ingress queue if everything has 1151 * been read */ 1152 if (vs->vs_bytesread >= vb->vb_buf->bytesused) { 1153 mutex_enter(&vs->vs_lock); 1154 vb = video_stream_dequeue(vs); 1155 video_stream_enqueue(vs, vb); 1156 mutex_exit(&vs->vs_lock); 1157 1158 vs->vs_bytesread = 0; 1159 } 1160 1161 return 0; 1162 } 1163 1164 1165 int 1166 videowrite(dev_t dev, struct uio *uio, int ioflag) 1167 { 1168 return ENXIO; 1169 } 1170 1171 1172 int 1173 videoioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1174 { 1175 struct video_softc *sc; 1176 const struct video_hw_if *hw; 1177 struct v4l2_capability *cap; 1178 struct v4l2_fmtdesc *fmtdesc; 1179 struct v4l2_format *fmt; 1180 struct v4l2_standard *std; 1181 struct v4l2_input *input; 1182 struct v4l2_control *control; 1183 struct v4l2_queryctrl *query; 1184 struct v4l2_requestbuffers *reqbufs; 1185 struct v4l2_buffer *buf; 1186 v4l2_std_id *stdid; 1187 enum v4l2_buf_type *typep; 1188 int *ip; 1189 1190 sc = device_private(device_lookup(&video_cd, VIDEOUNIT(dev))); 1191 1192 if (sc->sc_dying) 1193 return EIO; 1194 1195 hw = sc->hw_if; 1196 if (hw == NULL) 1197 return ENXIO; 1198 1199 switch (cmd) { 1200 case VIDIOC_QUERYCAP: 1201 cap = data; 1202 memset(cap, 0, sizeof(*cap)); 1203 strlcpy(cap->driver, device_xname(sc->hw_softc), 1204 sizeof(cap->driver)); 1205 strlcpy(cap->card, hw->get_devname(sc->hw_softc), 1206 sizeof(cap->card)); 1207 /* FIXME: bus_info is wrongly hardcoded to USB */ 1208 strlcpy(cap->bus_info, "USB", sizeof(cap->bus_info)); 1209 cap->version = VIDEO_DRIVER_VERSION; 1210 cap->capabilities = 0; 1211 if (hw->start_transfer != NULL && hw->stop_transfer != NULL) 1212 cap->capabilities |= V4L2_CAP_VIDEO_CAPTURE | 1213 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 1214 return 0; 1215 case VIDIOC_ENUM_FMT: 1216 /* TODO: for now, just enumerate one default format */ 1217 fmtdesc = data; 1218 if (fmtdesc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 1219 return EINVAL; 1220 if (fmtdesc->index != 0) 1221 return EINVAL; 1222 fmtdesc->index = fmtdesc->flags = 0; 1223 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1224 return video_enum_format(sc, fmtdesc); 1225 case VIDIOC_G_FMT: 1226 fmt = data; 1227 return (video_get_format(sc, fmt)); 1228 case VIDIOC_S_FMT: 1229 fmt = data; 1230 if ((flag & FWRITE) == 0) 1231 return EPERM; 1232 return video_set_format(sc, fmt); 1233 case VIDIOC_TRY_FMT: 1234 fmt = data; 1235 return (video_try_format(sc, fmt)); 1236 case VIDIOC_ENUMSTD: 1237 /* TODO: implement properly */ 1238 std = data; 1239 if (std->index != 0) 1240 return EINVAL; 1241 std->id = V4L2_STD_UNKNOWN; 1242 strlcpy(std->name, "webcam", sizeof(std->name)); 1243 return 0; 1244 case VIDIOC_G_STD: 1245 /* TODO: implement properly */ 1246 stdid = data; 1247 *stdid = V4L2_STD_UNKNOWN; 1248 return 0; 1249 case VIDIOC_S_STD: 1250 /* TODO: implement properly */ 1251 stdid = data; 1252 if (*stdid != V4L2_STD_UNKNOWN) 1253 return EINVAL; 1254 return 0; 1255 case VIDIOC_ENUMINPUT: 1256 /* TODO: implement properly */ 1257 input = data; 1258 if (input->index != 0) 1259 return EINVAL; 1260 memset(input, 0, sizeof(*input)); 1261 input->index = 0; 1262 strlcpy(input->name, "Camera", sizeof(input->name)); 1263 input->type = V4L2_INPUT_TYPE_CAMERA; 1264 return 0; 1265 case VIDIOC_G_INPUT: 1266 /* TODO: implement properly */ 1267 ip = data; 1268 *ip = 0; 1269 return 0; 1270 case VIDIOC_S_INPUT: 1271 /* TODO: implement properly */ 1272 ip = data; 1273 if (*ip != 0) 1274 return EINVAL; 1275 return 0; 1276 case VIDIOC_QUERYCTRL: 1277 query = data; 1278 return (video_query_control(sc, query)); 1279 case VIDIOC_G_CTRL: 1280 control = data; 1281 return (video_get_control(sc, control)); 1282 case VIDIOC_S_CTRL: 1283 control = data; 1284 if ((flag & FWRITE) == 0) 1285 return EPERM; 1286 return (video_set_control(sc, control)); 1287 case VIDIOC_REQBUFS: 1288 reqbufs = data; 1289 return (video_request_bufs(sc, reqbufs)); 1290 case VIDIOC_QUERYBUF: 1291 buf = data; 1292 return video_query_buf(sc, buf); 1293 case VIDIOC_QBUF: 1294 buf = data; 1295 return video_queue_buf(sc, buf); 1296 break; 1297 case VIDIOC_DQBUF: 1298 buf = data; 1299 return video_dequeue_buf(sc, buf); 1300 break; 1301 case VIDIOC_STREAMON: 1302 typep = data; 1303 return video_stream_on(sc, *typep); 1304 case VIDIOC_STREAMOFF: 1305 typep = data; 1306 return video_stream_off(sc, *typep); 1307 default: 1308 DPRINTF(("videoioctl: invalid cmd %s (%lx)\n", 1309 video_ioctl_str(cmd), cmd)); 1310 return EINVAL; 1311 } 1312 } 1313 1314 #ifdef VIDEO_DEBUG 1315 static const char * 1316 video_ioctl_str(u_long cmd) 1317 { 1318 const char *str; 1319 1320 switch (cmd) { 1321 case VIDIOC_QUERYCAP: 1322 str = "VIDIOC_QUERYCAP"; 1323 break; 1324 case VIDIOC_RESERVED: 1325 str = "VIDIOC_RESERVED"; 1326 break; 1327 case VIDIOC_ENUM_FMT: 1328 str = "VIDIOC_ENUM_FMT"; 1329 break; 1330 case VIDIOC_G_FMT: 1331 str = "VIDIOC_G_FMT"; 1332 break; 1333 case VIDIOC_S_FMT: 1334 str = "VIDIOC_S_FMT"; 1335 break; 1336 /* 6 and 7 are VIDIOC_[SG]_COMP, which are unsupported */ 1337 case VIDIOC_REQBUFS: 1338 str = "VIDIOC_REQBUFS"; 1339 break; 1340 case VIDIOC_QUERYBUF: 1341 str = "VIDIOC_QUERYBUF"; 1342 break; 1343 case VIDIOC_G_FBUF: 1344 str = "VIDIOC_G_FBUF"; 1345 break; 1346 case VIDIOC_S_FBUF: 1347 str = "VIDIOC_S_FBUF"; 1348 break; 1349 case VIDIOC_OVERLAY: 1350 str = "VIDIOC_OVERLAY"; 1351 break; 1352 case VIDIOC_QBUF: 1353 str = "VIDIOC_QBUF"; 1354 break; 1355 case VIDIOC_DQBUF: 1356 str = "VIDIOC_DQBUF"; 1357 break; 1358 case VIDIOC_STREAMON: 1359 str = "VIDIOC_STREAMON"; 1360 break; 1361 case VIDIOC_STREAMOFF: 1362 str = "VIDIOC_STREAMOFF"; 1363 break; 1364 case VIDIOC_G_PARM: 1365 str = "VIDIOC_G_PARAM"; 1366 break; 1367 case VIDIOC_S_PARM: 1368 str = "VIDIOC_S_PARAM"; 1369 break; 1370 case VIDIOC_G_STD: 1371 str = "VIDIOC_G_STD"; 1372 break; 1373 case VIDIOC_S_STD: 1374 str = "VIDIOC_S_STD"; 1375 break; 1376 case VIDIOC_ENUMSTD: 1377 str = "VIDIOC_ENUMSTD"; 1378 break; 1379 case VIDIOC_ENUMINPUT: 1380 str = "VIDIOC_ENUMINPUT"; 1381 break; 1382 case VIDIOC_G_CTRL: 1383 str = "VIDIOC_G_CTRL"; 1384 break; 1385 case VIDIOC_S_CTRL: 1386 str = "VIDIOC_S_CTRL"; 1387 break; 1388 case VIDIOC_G_TUNER: 1389 str = "VIDIOC_G_TUNER"; 1390 break; 1391 case VIDIOC_S_TUNER: 1392 str = "VIDIOC_S_TUNER"; 1393 break; 1394 case VIDIOC_G_AUDIO: 1395 str = "VIDIOC_G_AUDIO"; 1396 break; 1397 case VIDIOC_S_AUDIO: 1398 str = "VIDIOC_S_AUDIO"; 1399 break; 1400 case VIDIOC_QUERYCTRL: 1401 str = "VIDIOC_QUERYCTRL"; 1402 break; 1403 case VIDIOC_QUERYMENU: 1404 str = "VIDIOC_QUERYMENU"; 1405 break; 1406 case VIDIOC_G_INPUT: 1407 str = "VIDIOC_G_INPUT"; 1408 break; 1409 case VIDIOC_S_INPUT: 1410 str = "VIDIOC_S_INPUT"; 1411 break; 1412 case VIDIOC_G_OUTPUT: 1413 str = "VIDIOC_G_OUTPUT"; 1414 break; 1415 case VIDIOC_S_OUTPUT: 1416 str = "VIDIOC_S_OUTPUT"; 1417 break; 1418 case VIDIOC_ENUMOUTPUT: 1419 str = "VIDIOC_ENUMOUTPUT"; 1420 break; 1421 case VIDIOC_G_AUDOUT: 1422 str = "VIDIOC_G_AUDOUT"; 1423 break; 1424 case VIDIOC_S_AUDOUT: 1425 str = "VIDIOC_S_AUDOUT"; 1426 break; 1427 case VIDIOC_G_MODULATOR: 1428 str = "VIDIOC_G_MODULATOR"; 1429 break; 1430 case VIDIOC_S_MODULATOR: 1431 str = "VIDIOC_S_MODULATOR"; 1432 break; 1433 case VIDIOC_G_FREQUENCY: 1434 str = "VIDIOC_G_FREQUENCY"; 1435 break; 1436 case VIDIOC_S_FREQUENCY: 1437 str = "VIDIOC_S_FREQUENCY"; 1438 break; 1439 case VIDIOC_CROPCAP: 1440 str = "VIDIOC_CROPCAP"; 1441 break; 1442 case VIDIOC_G_CROP: 1443 str = "VIDIOC_G_CROP"; 1444 break; 1445 case VIDIOC_S_CROP: 1446 str = "VIDIOC_S_CROP"; 1447 break; 1448 case VIDIOC_G_JPEGCOMP: 1449 str = "VIDIOC_G_JPEGCOMP"; 1450 break; 1451 case VIDIOC_S_JPEGCOMP: 1452 str = "VIDIOC_S_JPEGCOMP"; 1453 break; 1454 case VIDIOC_QUERYSTD: 1455 str = "VIDIOC_QUERYSTD"; 1456 break; 1457 case VIDIOC_TRY_FMT: 1458 str = "VIDIOC_TRY_FMT"; 1459 break; 1460 case VIDIOC_ENUMAUDIO: 1461 str = "VIDIOC_ENUMAUDIO"; 1462 break; 1463 case VIDIOC_ENUMAUDOUT: 1464 str = "VIDIOC_ENUMAUDOUT"; 1465 break; 1466 case VIDIOC_G_PRIORITY: 1467 str = "VIDIOC_G_PRIORITY"; 1468 break; 1469 case VIDIOC_S_PRIORITY: 1470 str = "VIDIOC_S_PRIORITY"; 1471 break; 1472 default: 1473 str = "unknown"; 1474 break; 1475 } 1476 return str; 1477 } 1478 #endif 1479 1480 1481 int 1482 videopoll(dev_t dev, int events, struct lwp *l) 1483 { 1484 struct video_softc *sc; 1485 struct video_stream *vs; 1486 int err, revents = 0; 1487 1488 sc = device_private(device_lookup(&video_cd, VIDEOUNIT(dev))); 1489 vs = &sc->sc_stream_in; 1490 1491 if (sc->sc_dying) 1492 return (POLLHUP); 1493 1494 /* userspace has chosen read() method */ 1495 if (vs->vs_method == VIDEO_STREAM_METHOD_NONE) { 1496 err = video_stream_setup_bufs(vs, 1497 VIDEO_STREAM_METHOD_READ, 1498 VIDEO_NUM_BUFS); 1499 if (err != 0) 1500 return POLLERR; 1501 1502 err = video_stream_on(sc, vs->vs_type); 1503 if (err != 0) 1504 return POLLERR; 1505 } 1506 1507 if (!SIMPLEQ_EMPTY(&sc->sc_stream_in.vs_egress)) 1508 revents |= events & (POLLIN | POLLRDNORM); 1509 1510 return (revents); 1511 } 1512 1513 1514 paddr_t 1515 videommap(dev_t dev, off_t off, int prot) 1516 { 1517 struct video_softc *sc; 1518 struct video_stream *vs; 1519 /* paddr_t pa; */ 1520 1521 sc = device_lookup_private(&video_cd, VIDEOUNIT(dev)); 1522 if (sc->sc_dying) 1523 return -1; 1524 1525 vs = &sc->sc_stream_in; 1526 1527 return scatter_buf_map(&vs->vs_data, off); 1528 } 1529 1530 1531 /* Allocates buffers and initizlizes some fields. The format field 1532 * must already have been initialized. */ 1533 void 1534 video_stream_init(struct video_stream *vs) 1535 { 1536 vs->vs_method = VIDEO_STREAM_METHOD_NONE; 1537 vs->vs_flags = 0; 1538 vs->vs_frameno = -1; 1539 vs->vs_sequence = 0; 1540 vs->vs_type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1541 vs->vs_nbufs = 0; 1542 vs->vs_buf = NULL; 1543 vs->vs_streaming = false; 1544 1545 memset(&vs->vs_format, 0, sizeof(vs->vs_format)); 1546 1547 SIMPLEQ_INIT(&vs->vs_ingress); 1548 SIMPLEQ_INIT(&vs->vs_egress); 1549 1550 mutex_init(&vs->vs_lock, MUTEX_DEFAULT, IPL_NONE); 1551 cv_init(&vs->vs_sample_cv, "video"); 1552 1553 scatter_buf_init(&vs->vs_data); 1554 } 1555 1556 void 1557 video_stream_fini(struct video_stream *vs) 1558 { 1559 /* Sample data in queues has already been freed */ 1560 /* while (SIMPLEQ_FIRST(&vs->vs_ingress) != NULL) 1561 SIMPLEQ_REMOVE_HEAD(&vs->vs_ingress, entries); 1562 while (SIMPLEQ_FIRST(&vs->vs_egress) != NULL) 1563 SIMPLEQ_REMOVE_HEAD(&vs->vs_egress, entries); */ 1564 1565 mutex_destroy(&vs->vs_lock); 1566 cv_destroy(&vs->vs_sample_cv); 1567 1568 scatter_buf_destroy(&vs->vs_data); 1569 } 1570 1571 static int 1572 video_stream_setup_bufs(struct video_stream *vs, 1573 enum video_stream_method method, 1574 uint8_t nbufs) 1575 { 1576 int i, err; 1577 1578 mutex_enter(&vs->vs_lock); 1579 1580 /* Ensure that all allocated buffers are queued and not under 1581 * userspace control. */ 1582 for (i = 0; i < vs->vs_nbufs; ++i) { 1583 if (!(vs->vs_buf[i]->vb_buf->flags | V4L2_BUF_FLAG_QUEUED)) { 1584 mutex_exit(&vs->vs_lock); 1585 return EBUSY; 1586 } 1587 } 1588 1589 /* Allocate the buffers */ 1590 err = video_stream_realloc_bufs(vs, nbufs); 1591 if (err != 0) { 1592 mutex_exit(&vs->vs_lock); 1593 return err; 1594 } 1595 1596 /* Queue up buffers for read method. Other methods are queued 1597 * by VIDIOC_QBUF ioctl. */ 1598 if (method == VIDEO_STREAM_METHOD_READ) { 1599 for (i = 0; i < nbufs; ++i) 1600 if (!(vs->vs_buf[i]->vb_buf->flags & V4L2_BUF_FLAG_QUEUED)) 1601 video_stream_enqueue(vs, vs->vs_buf[i]); 1602 } 1603 1604 vs->vs_method = method; 1605 mutex_exit(&vs->vs_lock); 1606 1607 return 0; 1608 } 1609 1610 /* Free all buffer memory in preparation for close(). This should 1611 * free buffers regardless of errors. Use video_stream_setup_bufs if 1612 * you need to check for errors. Streaming should be off before 1613 * calling this function. */ 1614 static void 1615 video_stream_teardown_bufs(struct video_stream *vs) 1616 { 1617 int err; 1618 1619 mutex_enter(&vs->vs_lock); 1620 1621 if (vs->vs_streaming) 1622 DPRINTF(("video_stream_teardown_bufs: " 1623 "tearing down bufs while streaming\n")); 1624 1625 /* dequeue all buffers */ 1626 while (SIMPLEQ_FIRST(&vs->vs_ingress) != NULL) 1627 SIMPLEQ_REMOVE_HEAD(&vs->vs_ingress, entries); 1628 while (SIMPLEQ_FIRST(&vs->vs_egress) != NULL) 1629 SIMPLEQ_REMOVE_HEAD(&vs->vs_egress, entries); 1630 1631 err = video_stream_free_bufs(vs); 1632 if (err != 0) 1633 DPRINTF(("video_stream_teardown_bufs: " 1634 "error releasing buffers: %d\n", 1635 err)); 1636 1637 vs->vs_method = VIDEO_STREAM_METHOD_NONE; 1638 1639 mutex_exit(&vs->vs_lock); 1640 } 1641 1642 static struct video_buffer * 1643 video_buffer_alloc(void) 1644 { 1645 struct video_buffer *vb; 1646 1647 vb = kmem_alloc(sizeof(*vb), KM_SLEEP); 1648 if (vb == NULL) 1649 return NULL; 1650 1651 vb->vb_buf = kmem_alloc(sizeof(*vb->vb_buf), KM_SLEEP); 1652 if (vb->vb_buf == NULL) { 1653 kmem_free(vb, sizeof(*vb)); 1654 return NULL; 1655 } 1656 1657 return vb; 1658 } 1659 1660 static void 1661 video_buffer_free(struct video_buffer *vb) 1662 { 1663 kmem_free(vb->vb_buf, sizeof(*vb->vb_buf)); 1664 vb->vb_buf = NULL; 1665 kmem_free(vb, sizeof(*vb)); 1666 } 1667 1668 /* TODO: for userptr method 1669 struct video_buffer * 1670 video_buf_alloc_with_ubuf(struct v4l2_buffer *buf) 1671 { 1672 } 1673 1674 void 1675 video_buffer_free_with_ubuf(struct video_buffer *vb) 1676 { 1677 } 1678 */ 1679 1680 static int 1681 video_stream_realloc_bufs(struct video_stream *vs, uint8_t nbufs) 1682 { 1683 int i, err; 1684 uint8_t minnbufs, oldnbufs; 1685 size_t size; 1686 off_t offset; 1687 struct video_buffer **oldbuf; 1688 struct v4l2_buffer *buf; 1689 1690 size = vs->vs_format.sample_size * nbufs; 1691 err = scatter_buf_set_size(&vs->vs_data, size); 1692 if (err != 0) 1693 return err; 1694 1695 oldnbufs = vs->vs_nbufs; 1696 oldbuf = vs->vs_buf; 1697 1698 vs->vs_nbufs = nbufs; 1699 if (nbufs > 0) { 1700 vs->vs_buf = 1701 kmem_alloc(sizeof(struct video_buffer *) * nbufs, KM_SLEEP); 1702 if (vs->vs_buf == NULL) { 1703 vs->vs_nbufs = oldnbufs; 1704 vs->vs_buf = oldbuf; 1705 1706 return ENOMEM; 1707 } 1708 } else { 1709 vs->vs_buf = NULL; 1710 } 1711 1712 minnbufs = min(vs->vs_nbufs, oldnbufs); 1713 /* copy any bufs that will be reused */ 1714 for (i = 0; i < minnbufs; ++i) 1715 vs->vs_buf[i] = oldbuf[i]; 1716 /* allocate any necessary new bufs */ 1717 for (; i < vs->vs_nbufs; ++i) 1718 vs->vs_buf[i] = video_buffer_alloc(); 1719 /* free any bufs no longer used */ 1720 for (; i < oldnbufs; ++i) { 1721 video_buffer_free(oldbuf[i]); 1722 oldbuf[i] = NULL; 1723 } 1724 1725 /* Free old buffer metadata */ 1726 if (oldbuf != NULL) 1727 kmem_free(oldbuf, sizeof(struct video_buffer *) * oldnbufs); 1728 1729 /* initialize bufs */ 1730 offset = 0; 1731 for (i = 0; i < vs->vs_nbufs; ++i) { 1732 buf = vs->vs_buf[i]->vb_buf; 1733 buf->index = i; 1734 buf->type = vs->vs_type; 1735 buf->bytesused = 0; 1736 buf->flags = 0; 1737 buf->field = 0; 1738 buf->sequence = 0; 1739 buf->memory = V4L2_MEMORY_MMAP; 1740 buf->m.offset = offset; 1741 buf->length = vs->vs_format.sample_size; 1742 buf->input = 0; 1743 buf->reserved = 0; 1744 1745 offset += buf->length; 1746 } 1747 1748 return 0; 1749 } 1750 1751 /* Accepts a video_sample into the ingress queue. Caller must hold 1752 * the stream lock. */ 1753 void 1754 video_stream_enqueue(struct video_stream *vs, struct video_buffer *vb) 1755 { 1756 if (vb->vb_buf->flags & V4L2_BUF_FLAG_QUEUED) { 1757 DPRINTF(("video_stream_enqueue: sample already queued\n")); 1758 return; 1759 } 1760 1761 vb->vb_buf->flags |= V4L2_BUF_FLAG_QUEUED; 1762 vb->vb_buf->flags &= ~V4L2_BUF_FLAG_DONE; 1763 1764 vb->vb_buf->bytesused = 0; 1765 1766 SIMPLEQ_INSERT_TAIL(&vs->vs_ingress, vb, entries); 1767 } 1768 1769 1770 /* Removes the head of the egress queue for use by userspace. Caller 1771 * must hold the stream lock. */ 1772 struct video_buffer * 1773 video_stream_dequeue(struct video_stream *vs) 1774 { 1775 struct video_buffer *vb; 1776 1777 if (!SIMPLEQ_EMPTY(&vs->vs_egress)) { 1778 vb = SIMPLEQ_FIRST(&vs->vs_egress); 1779 SIMPLEQ_REMOVE_HEAD(&vs->vs_egress, entries); 1780 vb->vb_buf->flags &= ~V4L2_BUF_FLAG_QUEUED; 1781 vb->vb_buf->flags |= V4L2_BUF_FLAG_DONE; 1782 return vb; 1783 } else { 1784 return NULL; 1785 } 1786 } 1787 1788 1789 /* 1790 * write payload data to the appropriate video sample, possibly moving 1791 * the sample from ingress to egress queues 1792 */ 1793 void 1794 video_stream_write(struct video_stream *vs, 1795 const struct video_payload *payload) 1796 { 1797 struct video_buffer *vb; 1798 struct v4l2_buffer *buf; 1799 struct scatter_io sio; 1800 1801 mutex_enter(&vs->vs_lock); 1802 1803 /* change of frameno implies end of current frame */ 1804 if (vs->vs_frameno > 0 && vs->vs_frameno != payload->frameno) 1805 video_stream_sample_done(vs); 1806 1807 if (vs->vs_drop || SIMPLEQ_EMPTY(&vs->vs_ingress)) { 1808 /* DPRINTF(("video_stream_write: dropping sample %d\n", 1809 vs->vs_sequence)); */ 1810 vs->vs_drop = true; 1811 } else { 1812 vb = SIMPLEQ_FIRST(&vs->vs_ingress); 1813 buf = vb->vb_buf; 1814 if (payload->size > buf->length - buf->bytesused) { 1815 DPRINTF(("video_stream_write: " 1816 "payload would overflow\n")); 1817 } else if (scatter_io_init(&vs->vs_data, 1818 buf->m.offset + buf->bytesused, 1819 payload->size, 1820 &sio)) 1821 { 1822 scatter_io_copyin(&sio, payload->data); 1823 buf->bytesused += (payload->size - sio.sio_resid); 1824 } else { 1825 DPRINTF(("video_stream_write: failed to init scatter io " 1826 "vb=%p buf=%p " 1827 "buf->m.offset=%d buf->bytesused=%zu " 1828 "payload->size=%zu\n", 1829 vb, buf, 1830 buf->m.offset, buf->bytesused, payload->size)); 1831 } 1832 } 1833 1834 /* if the payload marks it, we can do sample_done() early */ 1835 if (payload->end_of_frame) 1836 video_stream_sample_done(vs); 1837 1838 mutex_exit(&vs->vs_lock); 1839 } 1840 1841 1842 /* Moves the head of the ingress queue to the tail of the egress 1843 * queue, or resets drop status if we were dropping this sample. 1844 * Caller should hold the stream queue lock. */ 1845 void 1846 video_stream_sample_done(struct video_stream *vs) 1847 { 1848 struct video_buffer *vb; 1849 1850 if (vs->vs_drop) { 1851 vs->vs_drop = false; 1852 } else if (!SIMPLEQ_EMPTY(&vs->vs_ingress)) { 1853 vb = SIMPLEQ_FIRST(&vs->vs_ingress); 1854 vb->vb_buf->sequence = vs->vs_sequence; 1855 SIMPLEQ_REMOVE_HEAD(&vs->vs_ingress, entries); 1856 1857 SIMPLEQ_INSERT_TAIL(&vs->vs_egress, vb, entries); 1858 cv_signal(&vs->vs_sample_cv); 1859 } else { 1860 DPRINTF(("video_stream_sample_done: no sample\n")); 1861 } 1862 1863 vs->vs_frameno ^= 1; 1864 vs->vs_sequence++; 1865 } 1866 1867 /* Check if all buffers are queued, i.e. none are under control of 1868 * userspace. */ 1869 /* 1870 static bool 1871 video_stream_all_queued(struct video_stream *vs) 1872 { 1873 } 1874 */ 1875 1876 1877 static void 1878 scatter_buf_init(struct scatter_buf *sb) 1879 { 1880 sb->sb_pool = pool_cache_init(PAGE_SIZE, 0, 0, 0, 1881 "video", NULL, IPL_VIDEO, 1882 NULL, NULL, NULL); 1883 sb->sb_size = 0; 1884 sb->sb_npages = 0; 1885 sb->sb_page_ary = NULL; 1886 } 1887 1888 static void 1889 scatter_buf_destroy(struct scatter_buf *sb) 1890 { 1891 /* Do we need to return everything to the pool first? */ 1892 scatter_buf_set_size(sb, 0); 1893 pool_cache_destroy(sb->sb_pool); 1894 sb->sb_pool = 0; 1895 sb->sb_npages = 0; 1896 sb->sb_page_ary = NULL; 1897 } 1898 1899 /* Increase or decrease the size of the buffer */ 1900 static int 1901 scatter_buf_set_size(struct scatter_buf *sb, size_t sz) 1902 { 1903 int i; 1904 size_t npages, minpages, oldnpages; 1905 uint8_t **old_ary; 1906 1907 npages = (sz >> PAGE_SHIFT) + ((sz & PAGE_MASK) > 0); 1908 1909 if (sb->sb_npages == npages) { 1910 return 0; 1911 } 1912 1913 oldnpages = sb->sb_npages; 1914 old_ary = sb->sb_page_ary; 1915 1916 sb->sb_npages = npages; 1917 if (npages > 0) { 1918 sb->sb_page_ary = 1919 kmem_alloc(sizeof(uint8_t *) * npages, KM_SLEEP); 1920 if (sb->sb_page_ary == NULL) { 1921 sb->sb_npages = oldnpages; 1922 sb->sb_page_ary = old_ary; 1923 return ENOMEM; 1924 } 1925 } else { 1926 sb->sb_page_ary = NULL; 1927 } 1928 1929 minpages = min(npages, oldnpages); 1930 /* copy any pages that will be reused */ 1931 for (i = 0; i < minpages; ++i) 1932 sb->sb_page_ary[i] = old_ary[i]; 1933 /* allocate any new pages */ 1934 for (; i < npages; ++i) { 1935 sb->sb_page_ary[i] = pool_cache_get(sb->sb_pool, 0); 1936 /* TODO: does pool_cache_get return NULL on 1937 * ENOMEM? If so, we need to release or note 1938 * the pages with did allocate 1939 * successfully. */ 1940 if (sb->sb_page_ary[i] == NULL) { 1941 DPRINTF(("video: pool_cache_get ENOMEM\n")); 1942 return ENOMEM; 1943 } 1944 } 1945 /* return any pages no longer needed */ 1946 for (; i < oldnpages; ++i) 1947 pool_cache_put(sb->sb_pool, old_ary[i]); 1948 1949 if (old_ary != NULL) 1950 kmem_free(old_ary, sizeof(uint8_t *) * oldnpages); 1951 1952 sb->sb_size = sb->sb_npages << PAGE_SHIFT; 1953 1954 return 0; 1955 } 1956 1957 1958 static paddr_t 1959 scatter_buf_map(struct scatter_buf *sb, off_t off) 1960 { 1961 size_t pg; 1962 paddr_t pa; 1963 1964 pg = off >> PAGE_SHIFT; 1965 1966 if (pg >= sb->sb_npages) 1967 return -1; 1968 else if (!pmap_extract(pmap_kernel(), (vaddr_t)sb->sb_page_ary[pg], &pa)) 1969 return -1; 1970 1971 return atop(pa); 1972 } 1973 1974 /* Initialize data for an io operation on a scatter buffer. Returns 1975 * true if the transfer is valid, or false if out of range. */ 1976 static bool 1977 scatter_io_init(struct scatter_buf *sb, 1978 off_t off, size_t len, 1979 struct scatter_io *sio) 1980 { 1981 if ((off + len) > sb->sb_size) { 1982 DPRINTF(("video: scatter_io_init failed: off=%" PRId64 1983 " len=%zu sb->sb_size=%zu\n", 1984 off, len, sb->sb_size)); 1985 return false; 1986 } 1987 1988 sio->sio_buf = sb; 1989 sio->sio_offset = off; 1990 sio->sio_resid = len; 1991 1992 return true; 1993 } 1994 1995 /* Store the pointer and size of the next contiguous segment. Returns 1996 * true if the segment is valid, or false if all has been transfered. 1997 * Does not check for overflow. */ 1998 static bool 1999 scatter_io_next(struct scatter_io *sio, void **p, size_t *sz) 2000 { 2001 size_t pg, pgo; 2002 2003 if (sio->sio_resid == 0) 2004 return false; 2005 2006 pg = sio->sio_offset >> PAGE_SHIFT; 2007 pgo = sio->sio_offset & PAGE_MASK; 2008 2009 *sz = min(PAGE_SIZE - pgo, sio->sio_resid); 2010 *p = sio->sio_buf->sb_page_ary[pg] + pgo; 2011 2012 sio->sio_offset += *sz; 2013 sio->sio_resid -= *sz; 2014 2015 return true; 2016 } 2017 2018 /* Semi-undo of a failed segment copy. Updates the scatter_io 2019 * struct to the previous values prior to a failed segment copy. */ 2020 static void 2021 scatter_io_undo(struct scatter_io *sio, size_t sz) 2022 { 2023 sio->sio_offset -= sz; 2024 sio->sio_resid += sz; 2025 } 2026 2027 /* Copy data from src into the scatter_buf as described by io. */ 2028 static void 2029 scatter_io_copyin(struct scatter_io *sio, const void *p) 2030 { 2031 void *dst; 2032 const uint8_t *src = p; 2033 size_t sz; 2034 2035 while(scatter_io_next(sio, &dst, &sz)) { 2036 memcpy(dst, src, sz); 2037 src += sz; 2038 } 2039 } 2040 2041 /* --not used; commented to avoid compiler warnings-- 2042 static void 2043 scatter_io_copyout(struct scatter_io *sio, void *p) 2044 { 2045 void *src; 2046 uint8_t *dst = p; 2047 size_t sz; 2048 2049 while(scatter_io_next(sio, &src, &sz)) { 2050 memcpy(dst, src, sz); 2051 dst += sz; 2052 } 2053 } 2054 */ 2055 2056 /* Performat a series of uiomove calls on a scatter buf. Returns 2057 * EFAULT if uiomove EFAULTs on the first segment. Otherwise, returns 2058 * an incomplete transfer but with no error. */ 2059 static int 2060 scatter_io_uiomove(struct scatter_io *sio, struct uio *uio) 2061 { 2062 void *p; 2063 size_t sz; 2064 bool first = true; 2065 int err; 2066 2067 while(scatter_io_next(sio, &p, &sz)) { 2068 err = uiomove(p, sz, uio); 2069 if (err == EFAULT) { 2070 scatter_io_undo(sio, sz); 2071 if (first) 2072 return EFAULT; 2073 else 2074 return 0; 2075 } 2076 first = false; 2077 } 2078 2079 return 0; 2080 } 2081 2082 #endif /* NVIDEO > 0 */ 2083
Indexes created Mon Sep 22 10:09:38 GMT 2025