1 /* 2 * STK1160 driver 3 * 4 * Copyright (C) 2012 Ezequiel Garcia 5 * <elezegarcia--a.t--gmail.com> 6 * 7 * Based on Easycap driver by R.M. Thomas 8 * Copyright (C) 2010 R.M. Thomas 9 * <rmthomas--a.t--sciolus.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 */ 22 23 #include <linux/module.h> 24 #include <linux/usb.h> 25 #include <linux/mm.h> 26 #include <linux/slab.h> 27 28 #include <linux/videodev2.h> 29 #include <media/v4l2-device.h> 30 #include <media/v4l2-common.h> 31 #include <media/v4l2-ioctl.h> 32 #include <media/v4l2-fh.h> 33 #include <media/v4l2-event.h> 34 #include <media/videobuf2-vmalloc.h> 35 36 #include <media/saa7115.h> 37 38 #include "stk1160.h" 39 #include "stk1160-reg.h" 40 41 static unsigned int vidioc_debug; 42 module_param(vidioc_debug, int, 0644); 43 MODULE_PARM_DESC(vidioc_debug, "enable debug messages [vidioc]"); 44 45 static bool keep_buffers; 46 module_param(keep_buffers, bool, 0644); 47 MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming"); 48 49 /* supported video standards */ 50 static struct stk1160_fmt format[] = { 51 { 52 .name = "16 bpp YUY2, 4:2:2, packed", 53 .fourcc = V4L2_PIX_FMT_UYVY, 54 .depth = 16, 55 } 56 }; 57 58 static void stk1160_set_std(struct stk1160 *dev) 59 { 60 int i; 61 62 static struct regval std525[] = { 63 64 /* 720x480 */ 65 66 /* Frame start */ 67 {STK116_CFSPO_STX_L, 0x0000}, 68 {STK116_CFSPO_STX_H, 0x0000}, 69 {STK116_CFSPO_STY_L, 0x0003}, 70 {STK116_CFSPO_STY_H, 0x0000}, 71 72 /* Frame end */ 73 {STK116_CFEPO_ENX_L, 0x05a0}, 74 {STK116_CFEPO_ENX_H, 0x0005}, 75 {STK116_CFEPO_ENY_L, 0x00f3}, 76 {STK116_CFEPO_ENY_H, 0x0000}, 77 78 {0xffff, 0xffff} 79 }; 80 81 static struct regval std625[] = { 82 83 /* 720x576 */ 84 85 /* TODO: Each line of frame has some junk at the end */ 86 /* Frame start */ 87 {STK116_CFSPO, 0x0000}, 88 {STK116_CFSPO+1, 0x0000}, 89 {STK116_CFSPO+2, 0x0001}, 90 {STK116_CFSPO+3, 0x0000}, 91 92 /* Frame end */ 93 {STK116_CFEPO, 0x05a0}, 94 {STK116_CFEPO+1, 0x0005}, 95 {STK116_CFEPO+2, 0x0121}, 96 {STK116_CFEPO+3, 0x0001}, 97 98 {0xffff, 0xffff} 99 }; 100 101 if (dev->norm & V4L2_STD_525_60) { 102 stk1160_dbg("registers to NTSC like standard\n"); 103 for (i = 0; std525[i].reg != 0xffff; i++) 104 stk1160_write_reg(dev, std525[i].reg, std525[i].val); 105 } else { 106 stk1160_dbg("registers to PAL like standard\n"); 107 for (i = 0; std625[i].reg != 0xffff; i++) 108 stk1160_write_reg(dev, std625[i].reg, std625[i].val); 109 } 110 111 } 112 113 /* 114 * Set a new alternate setting. 115 * Returns true is dev->max_pkt_size has changed, false otherwise. 116 */ 117 static bool stk1160_set_alternate(struct stk1160 *dev) 118 { 119 int i, prev_alt = dev->alt; 120 unsigned int min_pkt_size; 121 bool new_pkt_size; 122 123 /* 124 * If we don't set right alternate, 125 * then we will get a green screen with junk. 126 */ 127 min_pkt_size = STK1160_MIN_PKT_SIZE; 128 129 for (i = 0; i < dev->num_alt; i++) { 130 /* stop when the selected alt setting offers enough bandwidth */ 131 if (dev->alt_max_pkt_size[i] >= min_pkt_size) { 132 dev->alt = i; 133 break; 134 /* 135 * otherwise make sure that we end up with the maximum bandwidth 136 * because the min_pkt_size equation might be wrong... 137 */ 138 } else if (dev->alt_max_pkt_size[i] > 139 dev->alt_max_pkt_size[dev->alt]) 140 dev->alt = i; 141 } 142 143 stk1160_info("setting alternate %d\n", dev->alt); 144 145 if (dev->alt != prev_alt) { 146 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n", 147 min_pkt_size, dev->alt); 148 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n", 149 dev->alt, dev->alt_max_pkt_size[dev->alt]); 150 usb_set_interface(dev->udev, 0, dev->alt); 151 } 152 153 new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt]; 154 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt]; 155 156 return new_pkt_size; 157 } 158 159 static int stk1160_start_streaming(struct stk1160 *dev) 160 { 161 bool new_pkt_size; 162 int rc = 0; 163 int i; 164 165 /* Check device presence */ 166 if (!dev->udev) 167 return -ENODEV; 168 169 if (mutex_lock_interruptible(&dev->v4l_lock)) 170 return -ERESTARTSYS; 171 /* 172 * For some reason it is mandatory to set alternate *first* 173 * and only *then* initialize isoc urbs. 174 * Someone please explain me why ;) 175 */ 176 new_pkt_size = stk1160_set_alternate(dev); 177 178 /* 179 * We (re)allocate isoc urbs if: 180 * there is no allocated isoc urbs, OR 181 * a new dev->max_pkt_size is detected 182 */ 183 if (!dev->isoc_ctl.num_bufs || new_pkt_size) { 184 rc = stk1160_alloc_isoc(dev); 185 if (rc < 0) 186 goto out_stop_hw; 187 } 188 189 /* submit urbs and enables IRQ */ 190 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) { 191 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL); 192 if (rc) { 193 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc); 194 goto out_uninit; 195 } 196 } 197 198 /* Start saa711x */ 199 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1); 200 201 /* Start stk1160 */ 202 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3); 203 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 204 205 stk1160_dbg("streaming started\n"); 206 207 mutex_unlock(&dev->v4l_lock); 208 209 return 0; 210 211 out_uninit: 212 stk1160_uninit_isoc(dev); 213 out_stop_hw: 214 usb_set_interface(dev->udev, 0, 0); 215 stk1160_clear_queue(dev); 216 217 mutex_unlock(&dev->v4l_lock); 218 219 return rc; 220 } 221 222 /* Must be called with v4l_lock hold */ 223 static void stk1160_stop_hw(struct stk1160 *dev) 224 { 225 /* If the device is not physically present, there is nothing to do */ 226 if (!dev->udev) 227 return; 228 229 /* set alternate 0 */ 230 dev->alt = 0; 231 stk1160_info("setting alternate %d\n", dev->alt); 232 usb_set_interface(dev->udev, 0, 0); 233 234 /* Stop stk1160 */ 235 stk1160_write_reg(dev, STK1160_DCTRL, 0x00); 236 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 237 238 /* Stop saa711x */ 239 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0); 240 } 241 242 static int stk1160_stop_streaming(struct stk1160 *dev) 243 { 244 if (mutex_lock_interruptible(&dev->v4l_lock)) 245 return -ERESTARTSYS; 246 247 stk1160_cancel_isoc(dev); 248 249 /* 250 * It is possible to keep buffers around using a module parameter. 251 * This is intended to avoid memory fragmentation. 252 */ 253 if (!keep_buffers) 254 stk1160_free_isoc(dev); 255 256 stk1160_stop_hw(dev); 257 258 stk1160_clear_queue(dev); 259 260 stk1160_dbg("streaming stopped\n"); 261 262 mutex_unlock(&dev->v4l_lock); 263 264 return 0; 265 } 266 267 static struct v4l2_file_operations stk1160_fops = { 268 .owner = THIS_MODULE, 269 .open = v4l2_fh_open, 270 .release = vb2_fop_release, 271 .read = vb2_fop_read, 272 .poll = vb2_fop_poll, 273 .mmap = vb2_fop_mmap, 274 .unlocked_ioctl = video_ioctl2, 275 }; 276 277 /* 278 * vidioc ioctls 279 */ 280 static int vidioc_querycap(struct file *file, 281 void *priv, struct v4l2_capability *cap) 282 { 283 struct stk1160 *dev = video_drvdata(file); 284 285 strcpy(cap->driver, "stk1160"); 286 strcpy(cap->card, "stk1160"); 287 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); 288 cap->device_caps = 289 V4L2_CAP_VIDEO_CAPTURE | 290 V4L2_CAP_STREAMING | 291 V4L2_CAP_READWRITE; 292 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 293 return 0; 294 } 295 296 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 297 struct v4l2_fmtdesc *f) 298 { 299 if (f->index != 0) 300 return -EINVAL; 301 302 strlcpy(f->description, format[f->index].name, sizeof(f->description)); 303 f->pixelformat = format[f->index].fourcc; 304 return 0; 305 } 306 307 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 308 struct v4l2_format *f) 309 { 310 struct stk1160 *dev = video_drvdata(file); 311 312 f->fmt.pix.width = dev->width; 313 f->fmt.pix.height = dev->height; 314 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 315 f->fmt.pix.pixelformat = dev->fmt->fourcc; 316 f->fmt.pix.bytesperline = dev->width * 2; 317 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline; 318 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 319 320 return 0; 321 } 322 323 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 324 struct v4l2_format *f) 325 { 326 struct stk1160 *dev = video_drvdata(file); 327 328 /* 329 * User can't choose size at his own will, 330 * so we just return him the current size chosen 331 * at standard selection. 332 * TODO: Implement frame scaling? 333 */ 334 335 f->fmt.pix.pixelformat = dev->fmt->fourcc; 336 f->fmt.pix.width = dev->width; 337 f->fmt.pix.height = dev->height; 338 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 339 f->fmt.pix.bytesperline = dev->width * 2; 340 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline; 341 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 342 343 return 0; 344 } 345 346 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 347 struct v4l2_format *f) 348 { 349 struct stk1160 *dev = video_drvdata(file); 350 struct vb2_queue *q = &dev->vb_vidq; 351 352 if (vb2_is_busy(q)) 353 return -EBUSY; 354 355 vidioc_try_fmt_vid_cap(file, priv, f); 356 357 /* We don't support any format changes */ 358 359 return 0; 360 } 361 362 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm) 363 { 364 struct stk1160 *dev = video_drvdata(file); 365 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm); 366 return 0; 367 } 368 369 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm) 370 { 371 struct stk1160 *dev = video_drvdata(file); 372 373 *norm = dev->norm; 374 return 0; 375 } 376 377 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm) 378 { 379 struct stk1160 *dev = video_drvdata(file); 380 struct vb2_queue *q = &dev->vb_vidq; 381 382 if (dev->norm == norm) 383 return 0; 384 385 if (vb2_is_busy(q)) 386 return -EBUSY; 387 388 /* Check device presence */ 389 if (!dev->udev) 390 return -ENODEV; 391 392 /* We need to set this now, before we call stk1160_set_std */ 393 dev->norm = norm; 394 395 /* This is taken from saa7115 video decoder */ 396 if (dev->norm & V4L2_STD_525_60) { 397 dev->width = 720; 398 dev->height = 480; 399 } else if (dev->norm & V4L2_STD_625_50) { 400 dev->width = 720; 401 dev->height = 576; 402 } else { 403 stk1160_err("invalid standard\n"); 404 return -EINVAL; 405 } 406 407 stk1160_set_std(dev); 408 409 v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std, 410 dev->norm); 411 412 return 0; 413 } 414 415 416 static int vidioc_enum_input(struct file *file, void *priv, 417 struct v4l2_input *i) 418 { 419 struct stk1160 *dev = video_drvdata(file); 420 421 if (i->index > STK1160_MAX_INPUT) 422 return -EINVAL; 423 424 /* S-Video special handling */ 425 if (i->index == STK1160_SVIDEO_INPUT) 426 sprintf(i->name, "S-Video"); 427 else 428 sprintf(i->name, "Composite%d", i->index); 429 430 i->type = V4L2_INPUT_TYPE_CAMERA; 431 i->std = dev->vdev.tvnorms; 432 return 0; 433 } 434 435 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 436 { 437 struct stk1160 *dev = video_drvdata(file); 438 *i = dev->ctl_input; 439 return 0; 440 } 441 442 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 443 { 444 struct stk1160 *dev = video_drvdata(file); 445 446 if (i > STK1160_MAX_INPUT) 447 return -EINVAL; 448 449 dev->ctl_input = i; 450 451 stk1160_select_input(dev); 452 453 return 0; 454 } 455 456 #ifdef CONFIG_VIDEO_ADV_DEBUG 457 static int vidioc_g_register(struct file *file, void *priv, 458 struct v4l2_dbg_register *reg) 459 { 460 struct stk1160 *dev = video_drvdata(file); 461 int rc; 462 u8 val; 463 464 /* Match host */ 465 rc = stk1160_read_reg(dev, reg->reg, &val); 466 reg->val = val; 467 reg->size = 1; 468 469 return rc; 470 } 471 472 static int vidioc_s_register(struct file *file, void *priv, 473 const struct v4l2_dbg_register *reg) 474 { 475 struct stk1160 *dev = video_drvdata(file); 476 477 /* Match host */ 478 return stk1160_write_reg(dev, reg->reg, cpu_to_le16(reg->val)); 479 } 480 #endif 481 482 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = { 483 .vidioc_querycap = vidioc_querycap, 484 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 485 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 486 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 487 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 488 .vidioc_querystd = vidioc_querystd, 489 .vidioc_g_std = vidioc_g_std, 490 .vidioc_s_std = vidioc_s_std, 491 .vidioc_enum_input = vidioc_enum_input, 492 .vidioc_g_input = vidioc_g_input, 493 .vidioc_s_input = vidioc_s_input, 494 495 /* vb2 takes care of these */ 496 .vidioc_reqbufs = vb2_ioctl_reqbufs, 497 .vidioc_querybuf = vb2_ioctl_querybuf, 498 .vidioc_qbuf = vb2_ioctl_qbuf, 499 .vidioc_dqbuf = vb2_ioctl_dqbuf, 500 .vidioc_streamon = vb2_ioctl_streamon, 501 .vidioc_streamoff = vb2_ioctl_streamoff, 502 503 .vidioc_log_status = v4l2_ctrl_log_status, 504 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 505 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 506 507 #ifdef CONFIG_VIDEO_ADV_DEBUG 508 .vidioc_g_register = vidioc_g_register, 509 .vidioc_s_register = vidioc_s_register, 510 #endif 511 }; 512 513 /********************************************************************/ 514 515 /* 516 * Videobuf2 operations 517 */ 518 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *v4l_fmt, 519 unsigned int *nbuffers, unsigned int *nplanes, 520 unsigned int sizes[], void *alloc_ctxs[]) 521 { 522 struct stk1160 *dev = vb2_get_drv_priv(vq); 523 unsigned long size; 524 525 size = dev->width * dev->height * 2; 526 527 /* 528 * Here we can change the number of buffers being requested. 529 * So, we set a minimum and a maximum like this: 530 */ 531 *nbuffers = clamp_t(unsigned int, *nbuffers, 532 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS); 533 534 /* This means a packed colorformat */ 535 *nplanes = 1; 536 537 sizes[0] = size; 538 539 stk1160_info("%s: buffer count %d, each %ld bytes\n", 540 __func__, *nbuffers, size); 541 542 return 0; 543 } 544 545 static void buffer_queue(struct vb2_buffer *vb) 546 { 547 unsigned long flags; 548 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue); 549 struct stk1160_buffer *buf = 550 container_of(vb, struct stk1160_buffer, vb); 551 552 spin_lock_irqsave(&dev->buf_lock, flags); 553 if (!dev->udev) { 554 /* 555 * If the device is disconnected return the buffer to userspace 556 * directly. The next QBUF call will fail with -ENODEV. 557 */ 558 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 559 } else { 560 561 buf->mem = vb2_plane_vaddr(vb, 0); 562 buf->length = vb2_plane_size(vb, 0); 563 buf->bytesused = 0; 564 buf->pos = 0; 565 566 /* 567 * If buffer length is less from expected then we return 568 * the buffer to userspace directly. 569 */ 570 if (buf->length < dev->width * dev->height * 2) 571 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 572 else 573 list_add_tail(&buf->list, &dev->avail_bufs); 574 575 } 576 spin_unlock_irqrestore(&dev->buf_lock, flags); 577 } 578 579 static int start_streaming(struct vb2_queue *vq, unsigned int count) 580 { 581 struct stk1160 *dev = vb2_get_drv_priv(vq); 582 return stk1160_start_streaming(dev); 583 } 584 585 /* abort streaming and wait for last buffer */ 586 static int stop_streaming(struct vb2_queue *vq) 587 { 588 struct stk1160 *dev = vb2_get_drv_priv(vq); 589 return stk1160_stop_streaming(dev); 590 } 591 592 static struct vb2_ops stk1160_video_qops = { 593 .queue_setup = queue_setup, 594 .buf_queue = buffer_queue, 595 .start_streaming = start_streaming, 596 .stop_streaming = stop_streaming, 597 .wait_prepare = vb2_ops_wait_prepare, 598 .wait_finish = vb2_ops_wait_finish, 599 }; 600 601 static struct video_device v4l_template = { 602 .name = "stk1160", 603 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50, 604 .fops = &stk1160_fops, 605 .ioctl_ops = &stk1160_ioctl_ops, 606 .release = video_device_release_empty, 607 }; 608 609 /********************************************************************/ 610 611 /* Must be called with both v4l_lock and vb_queue_lock hold */ 612 void stk1160_clear_queue(struct stk1160 *dev) 613 { 614 struct stk1160_buffer *buf; 615 unsigned long flags; 616 617 /* Release all active buffers */ 618 spin_lock_irqsave(&dev->buf_lock, flags); 619 while (!list_empty(&dev->avail_bufs)) { 620 buf = list_first_entry(&dev->avail_bufs, 621 struct stk1160_buffer, list); 622 list_del(&buf->list); 623 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 624 stk1160_info("buffer [%p/%d] aborted\n", 625 buf, buf->vb.v4l2_buf.index); 626 } 627 /* It's important to clear current buffer */ 628 dev->isoc_ctl.buf = NULL; 629 spin_unlock_irqrestore(&dev->buf_lock, flags); 630 } 631 632 int stk1160_vb2_setup(struct stk1160 *dev) 633 { 634 int rc; 635 struct vb2_queue *q; 636 637 q = &dev->vb_vidq; 638 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 639 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR; 640 q->drv_priv = dev; 641 q->buf_struct_size = sizeof(struct stk1160_buffer); 642 q->ops = &stk1160_video_qops; 643 q->mem_ops = &vb2_vmalloc_memops; 644 q->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 645 646 rc = vb2_queue_init(q); 647 if (rc < 0) 648 return rc; 649 650 /* initialize video dma queue */ 651 INIT_LIST_HEAD(&dev->avail_bufs); 652 653 return 0; 654 } 655 656 int stk1160_video_register(struct stk1160 *dev) 657 { 658 int rc; 659 660 /* Initialize video_device with a template structure */ 661 dev->vdev = v4l_template; 662 dev->vdev.debug = vidioc_debug; 663 dev->vdev.queue = &dev->vb_vidq; 664 665 /* 666 * Provide mutexes for v4l2 core and for videobuf2 queue. 667 * It will be used to protect *only* v4l2 ioctls. 668 */ 669 dev->vdev.lock = &dev->v4l_lock; 670 dev->vdev.queue->lock = &dev->vb_queue_lock; 671 672 /* This will be used to set video_device parent */ 673 dev->vdev.v4l2_dev = &dev->v4l2_dev; 674 set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags); 675 676 /* NTSC is default */ 677 dev->norm = V4L2_STD_NTSC_M; 678 dev->width = 720; 679 dev->height = 480; 680 681 /* set default format */ 682 dev->fmt = &format[0]; 683 stk1160_set_std(dev); 684 685 v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std, 686 dev->norm); 687 688 video_set_drvdata(&dev->vdev, dev); 689 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1); 690 if (rc < 0) { 691 stk1160_err("video_register_device failed (%d)\n", rc); 692 return rc; 693 } 694 695 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n", 696 video_device_node_name(&dev->vdev)); 697 698 return 0; 699 } 700