1 /* 2 * Main USB camera driver 3 * 4 * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr> 5 * 6 * Camera button input handling by Márton Németh 7 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 * for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software Foundation, 21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 25 26 #define GSPCA_VERSION "2.14.0" 27 28 #include <linux/init.h> 29 #include <linux/fs.h> 30 #include <linux/vmalloc.h> 31 #include <linux/sched.h> 32 #include <linux/slab.h> 33 #include <linux/mm.h> 34 #include <linux/string.h> 35 #include <linux/pagemap.h> 36 #include <linux/io.h> 37 #include <asm/page.h> 38 #include <linux/uaccess.h> 39 #include <linux/ktime.h> 40 #include <media/v4l2-ioctl.h> 41 #include <media/v4l2-ctrls.h> 42 #include <media/v4l2-fh.h> 43 #include <media/v4l2-event.h> 44 45 #include "gspca.h" 46 47 #if IS_ENABLED(CONFIG_INPUT) 48 #include <linux/input.h> 49 #include <linux/usb/input.h> 50 #endif 51 52 /* global values */ 53 #define DEF_NURBS 3 /* default number of URBs */ 54 #if DEF_NURBS > MAX_NURBS 55 #error "DEF_NURBS too big" 56 #endif 57 58 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>"); 59 MODULE_DESCRIPTION("GSPCA USB Camera Driver"); 60 MODULE_LICENSE("GPL"); 61 MODULE_VERSION(GSPCA_VERSION); 62 63 int gspca_debug; 64 EXPORT_SYMBOL(gspca_debug); 65 66 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt, 67 __u32 pixfmt, int w, int h) 68 { 69 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') { 70 PDEBUG(debug, "%s %c%c%c%c %dx%d", 71 txt, 72 pixfmt & 0xff, 73 (pixfmt >> 8) & 0xff, 74 (pixfmt >> 16) & 0xff, 75 pixfmt >> 24, 76 w, h); 77 } else { 78 PDEBUG(debug, "%s 0x%08x %dx%d", 79 txt, 80 pixfmt, 81 w, h); 82 } 83 } 84 85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */ 86 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */ 87 #define GSPCA_MEMORY_READ 7 88 89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE) 90 91 /* 92 * VMA operations. 93 */ 94 static void gspca_vm_open(struct vm_area_struct *vma) 95 { 96 struct gspca_frame *frame = vma->vm_private_data; 97 98 frame->vma_use_count++; 99 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED; 100 } 101 102 static void gspca_vm_close(struct vm_area_struct *vma) 103 { 104 struct gspca_frame *frame = vma->vm_private_data; 105 106 if (--frame->vma_use_count <= 0) 107 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED; 108 } 109 110 static const struct vm_operations_struct gspca_vm_ops = { 111 .open = gspca_vm_open, 112 .close = gspca_vm_close, 113 }; 114 115 /* 116 * Input and interrupt endpoint handling functions 117 */ 118 #if IS_ENABLED(CONFIG_INPUT) 119 static void int_irq(struct urb *urb) 120 { 121 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; 122 int ret; 123 124 ret = urb->status; 125 switch (ret) { 126 case 0: 127 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev, 128 urb->transfer_buffer, urb->actual_length) < 0) { 129 PERR("Unknown packet received"); 130 } 131 break; 132 133 case -ENOENT: 134 case -ECONNRESET: 135 case -ENODEV: 136 case -ESHUTDOWN: 137 /* Stop is requested either by software or hardware is gone, 138 * keep the ret value non-zero and don't resubmit later. 139 */ 140 break; 141 142 default: 143 PERR("URB error %i, resubmitting", urb->status); 144 urb->status = 0; 145 ret = 0; 146 } 147 148 if (ret == 0) { 149 ret = usb_submit_urb(urb, GFP_ATOMIC); 150 if (ret < 0) 151 pr_err("Resubmit URB failed with error %i\n", ret); 152 } 153 } 154 155 static int gspca_input_connect(struct gspca_dev *dev) 156 { 157 struct input_dev *input_dev; 158 int err = 0; 159 160 dev->input_dev = NULL; 161 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) { 162 input_dev = input_allocate_device(); 163 if (!input_dev) 164 return -ENOMEM; 165 166 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys)); 167 strlcat(dev->phys, "/input0", sizeof(dev->phys)); 168 169 input_dev->name = dev->sd_desc->name; 170 input_dev->phys = dev->phys; 171 172 usb_to_input_id(dev->dev, &input_dev->id); 173 174 input_dev->evbit[0] = BIT_MASK(EV_KEY); 175 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA); 176 input_dev->dev.parent = &dev->dev->dev; 177 178 err = input_register_device(input_dev); 179 if (err) { 180 pr_err("Input device registration failed with error %i\n", 181 err); 182 input_dev->dev.parent = NULL; 183 input_free_device(input_dev); 184 } else { 185 dev->input_dev = input_dev; 186 } 187 } 188 189 return err; 190 } 191 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev, 193 struct usb_endpoint_descriptor *ep) 194 { 195 unsigned int buffer_len; 196 int interval; 197 struct urb *urb; 198 struct usb_device *dev; 199 void *buffer = NULL; 200 int ret = -EINVAL; 201 202 buffer_len = le16_to_cpu(ep->wMaxPacketSize); 203 interval = ep->bInterval; 204 PDEBUG(D_CONF, "found int in endpoint: 0x%x, " 205 "buffer_len=%u, interval=%u", 206 ep->bEndpointAddress, buffer_len, interval); 207 208 dev = gspca_dev->dev; 209 210 urb = usb_alloc_urb(0, GFP_KERNEL); 211 if (!urb) { 212 ret = -ENOMEM; 213 goto error; 214 } 215 216 buffer = usb_alloc_coherent(dev, buffer_len, 217 GFP_KERNEL, &urb->transfer_dma); 218 if (!buffer) { 219 ret = -ENOMEM; 220 goto error_buffer; 221 } 222 usb_fill_int_urb(urb, dev, 223 usb_rcvintpipe(dev, ep->bEndpointAddress), 224 buffer, buffer_len, 225 int_irq, (void *)gspca_dev, interval); 226 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 227 ret = usb_submit_urb(urb, GFP_KERNEL); 228 if (ret < 0) { 229 PERR("submit int URB failed with error %i", ret); 230 goto error_submit; 231 } 232 gspca_dev->int_urb = urb; 233 return ret; 234 235 error_submit: 236 usb_free_coherent(dev, 237 urb->transfer_buffer_length, 238 urb->transfer_buffer, 239 urb->transfer_dma); 240 error_buffer: 241 usb_free_urb(urb); 242 error: 243 return ret; 244 } 245 246 static void gspca_input_create_urb(struct gspca_dev *gspca_dev) 247 { 248 struct usb_interface *intf; 249 struct usb_host_interface *intf_desc; 250 struct usb_endpoint_descriptor *ep; 251 int i; 252 253 if (gspca_dev->sd_desc->int_pkt_scan) { 254 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface); 255 intf_desc = intf->cur_altsetting; 256 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { 257 ep = &intf_desc->endpoint[i].desc; 258 if (usb_endpoint_dir_in(ep) && 259 usb_endpoint_xfer_int(ep)) { 260 261 alloc_and_submit_int_urb(gspca_dev, ep); 262 break; 263 } 264 } 265 } 266 } 267 268 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev) 269 { 270 struct urb *urb; 271 272 urb = gspca_dev->int_urb; 273 if (urb) { 274 gspca_dev->int_urb = NULL; 275 usb_kill_urb(urb); 276 usb_free_coherent(gspca_dev->dev, 277 urb->transfer_buffer_length, 278 urb->transfer_buffer, 279 urb->transfer_dma); 280 usb_free_urb(urb); 281 } 282 } 283 #else 284 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev) 285 { 286 } 287 288 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev) 289 { 290 } 291 292 static inline int gspca_input_connect(struct gspca_dev *dev) 293 { 294 return 0; 295 } 296 #endif 297 298 /* 299 * fill a video frame from an URB and resubmit 300 */ 301 static void fill_frame(struct gspca_dev *gspca_dev, 302 struct urb *urb) 303 { 304 u8 *data; /* address of data in the iso message */ 305 int i, len, st; 306 cam_pkt_op pkt_scan; 307 308 if (urb->status != 0) { 309 if (urb->status == -ESHUTDOWN) 310 return; /* disconnection */ 311 #ifdef CONFIG_PM 312 if (gspca_dev->frozen) 313 return; 314 #endif 315 PERR("urb status: %d", urb->status); 316 urb->status = 0; 317 goto resubmit; 318 } 319 pkt_scan = gspca_dev->sd_desc->pkt_scan; 320 for (i = 0; i < urb->number_of_packets; i++) { 321 len = urb->iso_frame_desc[i].actual_length; 322 323 /* check the packet status and length */ 324 st = urb->iso_frame_desc[i].status; 325 if (st) { 326 pr_err("ISOC data error: [%d] len=%d, status=%d\n", 327 i, len, st); 328 gspca_dev->last_packet_type = DISCARD_PACKET; 329 continue; 330 } 331 if (len == 0) { 332 if (gspca_dev->empty_packet == 0) 333 gspca_dev->empty_packet = 1; 334 continue; 335 } 336 337 /* let the packet be analyzed by the subdriver */ 338 PDEBUG(D_PACK, "packet [%d] o:%d l:%d", 339 i, urb->iso_frame_desc[i].offset, len); 340 data = (u8 *) urb->transfer_buffer 341 + urb->iso_frame_desc[i].offset; 342 pkt_scan(gspca_dev, data, len); 343 } 344 345 resubmit: 346 /* resubmit the URB */ 347 st = usb_submit_urb(urb, GFP_ATOMIC); 348 if (st < 0) 349 pr_err("usb_submit_urb() ret %d\n", st); 350 } 351 352 /* 353 * ISOC message interrupt from the USB device 354 * 355 * Analyse each packet and call the subdriver for copy to the frame buffer. 356 */ 357 static void isoc_irq(struct urb *urb) 358 { 359 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; 360 361 PDEBUG(D_PACK, "isoc irq"); 362 if (!gspca_dev->streaming) 363 return; 364 fill_frame(gspca_dev, urb); 365 } 366 367 /* 368 * bulk message interrupt from the USB device 369 */ 370 static void bulk_irq(struct urb *urb) 371 { 372 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; 373 int st; 374 375 PDEBUG(D_PACK, "bulk irq"); 376 if (!gspca_dev->streaming) 377 return; 378 switch (urb->status) { 379 case 0: 380 break; 381 case -ESHUTDOWN: 382 return; /* disconnection */ 383 default: 384 #ifdef CONFIG_PM 385 if (gspca_dev->frozen) 386 return; 387 #endif 388 PERR("urb status: %d", urb->status); 389 urb->status = 0; 390 goto resubmit; 391 } 392 393 PDEBUG(D_PACK, "packet l:%d", urb->actual_length); 394 gspca_dev->sd_desc->pkt_scan(gspca_dev, 395 urb->transfer_buffer, 396 urb->actual_length); 397 398 resubmit: 399 /* resubmit the URB */ 400 if (gspca_dev->cam.bulk_nurbs != 0) { 401 st = usb_submit_urb(urb, GFP_ATOMIC); 402 if (st < 0) 403 pr_err("usb_submit_urb() ret %d\n", st); 404 } 405 } 406 407 /* 408 * add data to the current frame 409 * 410 * This function is called by the subdrivers at interrupt level. 411 * 412 * To build a frame, these ones must add 413 * - one FIRST_PACKET 414 * - 0 or many INTER_PACKETs 415 * - one LAST_PACKET 416 * DISCARD_PACKET invalidates the whole frame. 417 */ 418 void gspca_frame_add(struct gspca_dev *gspca_dev, 419 enum gspca_packet_type packet_type, 420 const u8 *data, 421 int len) 422 { 423 struct gspca_frame *frame; 424 int i, j; 425 426 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len); 427 428 if (packet_type == FIRST_PACKET) { 429 i = atomic_read(&gspca_dev->fr_i); 430 431 /* if there are no queued buffer, discard the whole frame */ 432 if (i == atomic_read(&gspca_dev->fr_q)) { 433 gspca_dev->last_packet_type = DISCARD_PACKET; 434 gspca_dev->sequence++; 435 return; 436 } 437 j = gspca_dev->fr_queue[i]; 438 frame = &gspca_dev->frame[j]; 439 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get()); 440 frame->v4l2_buf.sequence = gspca_dev->sequence++; 441 gspca_dev->image = frame->data; 442 gspca_dev->image_len = 0; 443 } else { 444 switch (gspca_dev->last_packet_type) { 445 case DISCARD_PACKET: 446 if (packet_type == LAST_PACKET) { 447 gspca_dev->last_packet_type = packet_type; 448 gspca_dev->image = NULL; 449 gspca_dev->image_len = 0; 450 } 451 return; 452 case LAST_PACKET: 453 return; 454 } 455 } 456 457 /* append the packet to the frame buffer */ 458 if (len > 0) { 459 if (gspca_dev->image_len + len > gspca_dev->frsz) { 460 PERR("frame overflow %d > %d", 461 gspca_dev->image_len + len, 462 gspca_dev->frsz); 463 packet_type = DISCARD_PACKET; 464 } else { 465 /* !! image is NULL only when last pkt is LAST or DISCARD 466 if (gspca_dev->image == NULL) { 467 pr_err("gspca_frame_add() image == NULL\n"); 468 return; 469 } 470 */ 471 memcpy(gspca_dev->image + gspca_dev->image_len, 472 data, len); 473 gspca_dev->image_len += len; 474 } 475 } 476 gspca_dev->last_packet_type = packet_type; 477 478 /* if last packet, invalidate packet concatenation until 479 * next first packet, wake up the application and advance 480 * in the queue */ 481 if (packet_type == LAST_PACKET) { 482 i = atomic_read(&gspca_dev->fr_i); 483 j = gspca_dev->fr_queue[i]; 484 frame = &gspca_dev->frame[j]; 485 frame->v4l2_buf.bytesused = gspca_dev->image_len; 486 frame->v4l2_buf.flags = (frame->v4l2_buf.flags 487 | V4L2_BUF_FLAG_DONE) 488 & ~V4L2_BUF_FLAG_QUEUED; 489 i = (i + 1) % GSPCA_MAX_FRAMES; 490 atomic_set(&gspca_dev->fr_i, i); 491 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */ 492 PDEBUG(D_FRAM, "frame complete len:%d", 493 frame->v4l2_buf.bytesused); 494 gspca_dev->image = NULL; 495 gspca_dev->image_len = 0; 496 } 497 } 498 EXPORT_SYMBOL(gspca_frame_add); 499 500 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file, 501 enum v4l2_memory memory, unsigned int count) 502 { 503 struct gspca_frame *frame; 504 unsigned int frsz; 505 int i; 506 507 frsz = gspca_dev->pixfmt.sizeimage; 508 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz); 509 frsz = PAGE_ALIGN(frsz); 510 if (count >= GSPCA_MAX_FRAMES) 511 count = GSPCA_MAX_FRAMES - 1; 512 gspca_dev->frbuf = vmalloc_32(frsz * count); 513 if (!gspca_dev->frbuf) { 514 pr_err("frame alloc failed\n"); 515 return -ENOMEM; 516 } 517 gspca_dev->capt_file = file; 518 gspca_dev->memory = memory; 519 gspca_dev->frsz = frsz; 520 gspca_dev->nframes = count; 521 for (i = 0; i < count; i++) { 522 frame = &gspca_dev->frame[i]; 523 frame->v4l2_buf.index = i; 524 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 525 frame->v4l2_buf.flags = 0; 526 frame->v4l2_buf.field = V4L2_FIELD_NONE; 527 frame->v4l2_buf.length = frsz; 528 frame->v4l2_buf.memory = memory; 529 frame->v4l2_buf.sequence = 0; 530 frame->data = gspca_dev->frbuf + i * frsz; 531 frame->v4l2_buf.m.offset = i * frsz; 532 } 533 atomic_set(&gspca_dev->fr_q, 0); 534 atomic_set(&gspca_dev->fr_i, 0); 535 gspca_dev->fr_o = 0; 536 return 0; 537 } 538 539 static void frame_free(struct gspca_dev *gspca_dev) 540 { 541 int i; 542 543 PDEBUG(D_STREAM, "frame free"); 544 if (gspca_dev->frbuf != NULL) { 545 vfree(gspca_dev->frbuf); 546 gspca_dev->frbuf = NULL; 547 for (i = 0; i < gspca_dev->nframes; i++) 548 gspca_dev->frame[i].data = NULL; 549 } 550 gspca_dev->nframes = 0; 551 gspca_dev->frsz = 0; 552 gspca_dev->capt_file = NULL; 553 gspca_dev->memory = GSPCA_MEMORY_NO; 554 } 555 556 static void destroy_urbs(struct gspca_dev *gspca_dev) 557 { 558 struct urb *urb; 559 unsigned int i; 560 561 PDEBUG(D_STREAM, "kill transfer"); 562 for (i = 0; i < MAX_NURBS; i++) { 563 urb = gspca_dev->urb[i]; 564 if (urb == NULL) 565 break; 566 567 gspca_dev->urb[i] = NULL; 568 usb_kill_urb(urb); 569 usb_free_coherent(gspca_dev->dev, 570 urb->transfer_buffer_length, 571 urb->transfer_buffer, 572 urb->transfer_dma); 573 usb_free_urb(urb); 574 } 575 } 576 577 static int gspca_set_alt0(struct gspca_dev *gspca_dev) 578 { 579 int ret; 580 581 if (gspca_dev->alt == 0) 582 return 0; 583 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0); 584 if (ret < 0) 585 pr_err("set alt 0 err %d\n", ret); 586 return ret; 587 } 588 589 /* Note: both the queue and the usb locks should be held when calling this */ 590 static void gspca_stream_off(struct gspca_dev *gspca_dev) 591 { 592 gspca_dev->streaming = 0; 593 gspca_dev->usb_err = 0; 594 if (gspca_dev->sd_desc->stopN) 595 gspca_dev->sd_desc->stopN(gspca_dev); 596 destroy_urbs(gspca_dev); 597 gspca_input_destroy_urb(gspca_dev); 598 gspca_set_alt0(gspca_dev); 599 gspca_input_create_urb(gspca_dev); 600 if (gspca_dev->sd_desc->stop0) 601 gspca_dev->sd_desc->stop0(gspca_dev); 602 PDEBUG(D_STREAM, "stream off OK"); 603 } 604 605 /* 606 * look for an input transfer endpoint in an alternate setting 607 */ 608 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt, 609 int xfer) 610 { 611 struct usb_host_endpoint *ep; 612 int i, attr; 613 614 for (i = 0; i < alt->desc.bNumEndpoints; i++) { 615 ep = &alt->endpoint[i]; 616 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; 617 if (attr == xfer 618 && ep->desc.wMaxPacketSize != 0 619 && usb_endpoint_dir_in(&ep->desc)) 620 return ep; 621 } 622 return NULL; 623 } 624 625 /* compute the minimum bandwidth for the current transfer */ 626 static u32 which_bandwidth(struct gspca_dev *gspca_dev) 627 { 628 u32 bandwidth; 629 630 /* get the (max) image size */ 631 bandwidth = gspca_dev->pixfmt.sizeimage; 632 633 /* if the image is compressed, estimate its mean size */ 634 if (!gspca_dev->cam.needs_full_bandwidth && 635 bandwidth < gspca_dev->pixfmt.width * 636 gspca_dev->pixfmt.height) 637 bandwidth = bandwidth * 3 / 8; /* 0.375 */ 638 639 /* estimate the frame rate */ 640 if (gspca_dev->sd_desc->get_streamparm) { 641 struct v4l2_streamparm parm; 642 643 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm); 644 bandwidth *= parm.parm.capture.timeperframe.denominator; 645 bandwidth /= parm.parm.capture.timeperframe.numerator; 646 } else { 647 648 /* don't hope more than 15 fps with USB 1.1 and 649 * image resolution >= 640x480 */ 650 if (gspca_dev->pixfmt.width >= 640 651 && gspca_dev->dev->speed == USB_SPEED_FULL) 652 bandwidth *= 15; /* 15 fps */ 653 else 654 bandwidth *= 30; /* 30 fps */ 655 } 656 657 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth); 658 return bandwidth; 659 } 660 661 /* endpoint table */ 662 #define MAX_ALT 16 663 struct ep_tb_s { 664 u32 alt; 665 u32 bandwidth; 666 }; 667 668 /* 669 * build the table of the endpoints 670 * and compute the minimum bandwidth for the image transfer 671 */ 672 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev, 673 struct usb_interface *intf, 674 struct ep_tb_s *ep_tb) 675 { 676 struct usb_host_endpoint *ep; 677 int i, j, nbalt, psize, found; 678 u32 bandwidth, last_bw; 679 680 nbalt = intf->num_altsetting; 681 if (nbalt > MAX_ALT) 682 nbalt = MAX_ALT; /* fixme: should warn */ 683 684 /* build the endpoint table */ 685 i = 0; 686 last_bw = 0; 687 for (;;) { 688 ep_tb->bandwidth = 2000 * 2000 * 120; 689 found = 0; 690 for (j = 0; j < nbalt; j++) { 691 ep = alt_xfer(&intf->altsetting[j], 692 USB_ENDPOINT_XFER_ISOC); 693 if (ep == NULL) 694 continue; 695 if (ep->desc.bInterval == 0) { 696 pr_err("alt %d iso endp with 0 interval\n", j); 697 continue; 698 } 699 psize = le16_to_cpu(ep->desc.wMaxPacketSize); 700 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); 701 bandwidth = psize * 1000; 702 if (gspca_dev->dev->speed == USB_SPEED_HIGH 703 || gspca_dev->dev->speed == USB_SPEED_SUPER) 704 bandwidth *= 8; 705 bandwidth /= 1 << (ep->desc.bInterval - 1); 706 if (bandwidth <= last_bw) 707 continue; 708 if (bandwidth < ep_tb->bandwidth) { 709 ep_tb->bandwidth = bandwidth; 710 ep_tb->alt = j; 711 found = 1; 712 } 713 } 714 if (!found) 715 break; 716 PDEBUG(D_STREAM, "alt %d bandwidth %d", 717 ep_tb->alt, ep_tb->bandwidth); 718 last_bw = ep_tb->bandwidth; 719 i++; 720 ep_tb++; 721 } 722 723 /* 724 * If the camera: 725 * has a usb audio class interface (a built in usb mic); and 726 * is a usb 1 full speed device; and 727 * uses the max full speed iso bandwidth; and 728 * and has more than 1 alt setting 729 * then skip the highest alt setting to spare bandwidth for the mic 730 */ 731 if (gspca_dev->audio && 732 gspca_dev->dev->speed == USB_SPEED_FULL && 733 last_bw >= 1000000 && 734 i > 1) { 735 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt"); 736 i--; 737 ep_tb--; 738 } 739 740 /* get the requested bandwidth and start at the highest atlsetting */ 741 bandwidth = which_bandwidth(gspca_dev); 742 ep_tb--; 743 while (i > 1) { 744 ep_tb--; 745 if (ep_tb->bandwidth < bandwidth) 746 break; 747 i--; 748 } 749 return i; 750 } 751 752 /* 753 * create the URBs for image transfer 754 */ 755 static int create_urbs(struct gspca_dev *gspca_dev, 756 struct usb_host_endpoint *ep) 757 { 758 struct urb *urb; 759 int n, nurbs, i, psize, npkt, bsize; 760 761 /* calculate the packet size and the number of packets */ 762 psize = le16_to_cpu(ep->desc.wMaxPacketSize); 763 764 if (!gspca_dev->cam.bulk) { /* isoc */ 765 766 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */ 767 if (gspca_dev->pkt_size == 0) 768 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); 769 else 770 psize = gspca_dev->pkt_size; 771 npkt = gspca_dev->cam.npkt; 772 if (npkt == 0) 773 npkt = 32; /* default value */ 774 bsize = psize * npkt; 775 PDEBUG(D_STREAM, 776 "isoc %d pkts size %d = bsize:%d", 777 npkt, psize, bsize); 778 nurbs = DEF_NURBS; 779 } else { /* bulk */ 780 npkt = 0; 781 bsize = gspca_dev->cam.bulk_size; 782 if (bsize == 0) 783 bsize = psize; 784 PDEBUG(D_STREAM, "bulk bsize:%d", bsize); 785 if (gspca_dev->cam.bulk_nurbs != 0) 786 nurbs = gspca_dev->cam.bulk_nurbs; 787 else 788 nurbs = 1; 789 } 790 791 for (n = 0; n < nurbs; n++) { 792 urb = usb_alloc_urb(npkt, GFP_KERNEL); 793 if (!urb) { 794 pr_err("usb_alloc_urb failed\n"); 795 return -ENOMEM; 796 } 797 gspca_dev->urb[n] = urb; 798 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev, 799 bsize, 800 GFP_KERNEL, 801 &urb->transfer_dma); 802 803 if (urb->transfer_buffer == NULL) { 804 pr_err("usb_alloc_coherent failed\n"); 805 return -ENOMEM; 806 } 807 urb->dev = gspca_dev->dev; 808 urb->context = gspca_dev; 809 urb->transfer_buffer_length = bsize; 810 if (npkt != 0) { /* ISOC */ 811 urb->pipe = usb_rcvisocpipe(gspca_dev->dev, 812 ep->desc.bEndpointAddress); 813 urb->transfer_flags = URB_ISO_ASAP 814 | URB_NO_TRANSFER_DMA_MAP; 815 urb->interval = 1 << (ep->desc.bInterval - 1); 816 urb->complete = isoc_irq; 817 urb->number_of_packets = npkt; 818 for (i = 0; i < npkt; i++) { 819 urb->iso_frame_desc[i].length = psize; 820 urb->iso_frame_desc[i].offset = psize * i; 821 } 822 } else { /* bulk */ 823 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev, 824 ep->desc.bEndpointAddress); 825 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; 826 urb->complete = bulk_irq; 827 } 828 } 829 return 0; 830 } 831 832 /* 833 * start the USB transfer 834 */ 835 static int gspca_init_transfer(struct gspca_dev *gspca_dev) 836 { 837 struct usb_interface *intf; 838 struct usb_host_endpoint *ep; 839 struct urb *urb; 840 struct ep_tb_s ep_tb[MAX_ALT]; 841 int n, ret, xfer, alt, alt_idx; 842 843 /* reset the streaming variables */ 844 gspca_dev->image = NULL; 845 gspca_dev->image_len = 0; 846 gspca_dev->last_packet_type = DISCARD_PACKET; 847 gspca_dev->sequence = 0; 848 849 gspca_dev->usb_err = 0; 850 851 /* do the specific subdriver stuff before endpoint selection */ 852 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface); 853 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0; 854 if (gspca_dev->sd_desc->isoc_init) { 855 ret = gspca_dev->sd_desc->isoc_init(gspca_dev); 856 if (ret < 0) 857 return ret; 858 } 859 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK 860 : USB_ENDPOINT_XFER_ISOC; 861 862 /* if bulk or the subdriver forced an altsetting, get the endpoint */ 863 if (gspca_dev->alt != 0) { 864 gspca_dev->alt--; /* (previous version compatibility) */ 865 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer); 866 if (ep == NULL) { 867 pr_err("bad altsetting %d\n", gspca_dev->alt); 868 return -EIO; 869 } 870 ep_tb[0].alt = gspca_dev->alt; 871 alt_idx = 1; 872 } else { 873 874 /* else, compute the minimum bandwidth 875 * and build the endpoint table */ 876 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb); 877 if (alt_idx <= 0) { 878 pr_err("no transfer endpoint found\n"); 879 return -EIO; 880 } 881 } 882 883 /* set the highest alternate setting and 884 * loop until urb submit succeeds */ 885 gspca_input_destroy_urb(gspca_dev); 886 887 gspca_dev->alt = ep_tb[--alt_idx].alt; 888 alt = -1; 889 for (;;) { 890 if (alt != gspca_dev->alt) { 891 alt = gspca_dev->alt; 892 if (intf->num_altsetting > 1) { 893 ret = usb_set_interface(gspca_dev->dev, 894 gspca_dev->iface, 895 alt); 896 if (ret < 0) { 897 if (ret == -ENOSPC) 898 goto retry; /*fixme: ugly*/ 899 pr_err("set alt %d err %d\n", alt, ret); 900 goto out; 901 } 902 } 903 } 904 if (!gspca_dev->cam.no_urb_create) { 905 PDEBUG(D_STREAM, "init transfer alt %d", alt); 906 ret = create_urbs(gspca_dev, 907 alt_xfer(&intf->altsetting[alt], xfer)); 908 if (ret < 0) { 909 destroy_urbs(gspca_dev); 910 goto out; 911 } 912 } 913 914 /* clear the bulk endpoint */ 915 if (gspca_dev->cam.bulk) 916 usb_clear_halt(gspca_dev->dev, 917 gspca_dev->urb[0]->pipe); 918 919 /* start the cam */ 920 ret = gspca_dev->sd_desc->start(gspca_dev); 921 if (ret < 0) { 922 destroy_urbs(gspca_dev); 923 goto out; 924 } 925 gspca_dev->streaming = 1; 926 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler); 927 928 /* some bulk transfers are started by the subdriver */ 929 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0) 930 break; 931 932 /* submit the URBs */ 933 for (n = 0; n < MAX_NURBS; n++) { 934 urb = gspca_dev->urb[n]; 935 if (urb == NULL) 936 break; 937 ret = usb_submit_urb(urb, GFP_KERNEL); 938 if (ret < 0) 939 break; 940 } 941 if (ret >= 0) 942 break; /* transfer is started */ 943 944 /* something when wrong 945 * stop the webcam and free the transfer resources */ 946 gspca_stream_off(gspca_dev); 947 if (ret != -ENOSPC) { 948 pr_err("usb_submit_urb alt %d err %d\n", 949 gspca_dev->alt, ret); 950 goto out; 951 } 952 953 /* the bandwidth is not wide enough 954 * negotiate or try a lower alternate setting */ 955 retry: 956 PERR("alt %d - bandwidth not wide enough, trying again", alt); 957 msleep(20); /* wait for kill complete */ 958 if (gspca_dev->sd_desc->isoc_nego) { 959 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev); 960 if (ret < 0) 961 goto out; 962 } else { 963 if (alt_idx <= 0) { 964 pr_err("no transfer endpoint found\n"); 965 ret = -EIO; 966 goto out; 967 } 968 gspca_dev->alt = ep_tb[--alt_idx].alt; 969 } 970 } 971 out: 972 gspca_input_create_urb(gspca_dev); 973 return ret; 974 } 975 976 static void gspca_set_default_mode(struct gspca_dev *gspca_dev) 977 { 978 int i; 979 980 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */ 981 gspca_dev->curr_mode = i; 982 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i]; 983 984 /* does nothing if ctrl_handler == NULL */ 985 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler); 986 } 987 988 static int wxh_to_mode(struct gspca_dev *gspca_dev, 989 int width, int height) 990 { 991 int i; 992 993 for (i = gspca_dev->cam.nmodes; --i > 0; ) { 994 if (width >= gspca_dev->cam.cam_mode[i].width 995 && height >= gspca_dev->cam.cam_mode[i].height) 996 break; 997 } 998 return i; 999 } 1000 1001 /* 1002 * search a mode with the right pixel format 1003 */ 1004 static int gspca_get_mode(struct gspca_dev *gspca_dev, 1005 int mode, 1006 int pixfmt) 1007 { 1008 int modeU, modeD; 1009 1010 modeU = modeD = mode; 1011 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) { 1012 if (--modeD >= 0) { 1013 if (gspca_dev->cam.cam_mode[modeD].pixelformat 1014 == pixfmt) 1015 return modeD; 1016 } 1017 if (++modeU < gspca_dev->cam.nmodes) { 1018 if (gspca_dev->cam.cam_mode[modeU].pixelformat 1019 == pixfmt) 1020 return modeU; 1021 } 1022 } 1023 return -EINVAL; 1024 } 1025 1026 #ifdef CONFIG_VIDEO_ADV_DEBUG 1027 static int vidioc_g_chip_info(struct file *file, void *priv, 1028 struct v4l2_dbg_chip_info *chip) 1029 { 1030 struct gspca_dev *gspca_dev = video_drvdata(file); 1031 1032 gspca_dev->usb_err = 0; 1033 if (gspca_dev->sd_desc->get_chip_info) 1034 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip); 1035 return chip->match.addr ? -EINVAL : 0; 1036 } 1037 1038 static int vidioc_g_register(struct file *file, void *priv, 1039 struct v4l2_dbg_register *reg) 1040 { 1041 struct gspca_dev *gspca_dev = video_drvdata(file); 1042 1043 gspca_dev->usb_err = 0; 1044 return gspca_dev->sd_desc->get_register(gspca_dev, reg); 1045 } 1046 1047 static int vidioc_s_register(struct file *file, void *priv, 1048 const struct v4l2_dbg_register *reg) 1049 { 1050 struct gspca_dev *gspca_dev = video_drvdata(file); 1051 1052 gspca_dev->usb_err = 0; 1053 return gspca_dev->sd_desc->set_register(gspca_dev, reg); 1054 } 1055 #endif 1056 1057 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 1058 struct v4l2_fmtdesc *fmtdesc) 1059 { 1060 struct gspca_dev *gspca_dev = video_drvdata(file); 1061 int i, j, index; 1062 __u32 fmt_tb[8]; 1063 1064 /* give an index to each format */ 1065 index = 0; 1066 j = 0; 1067 for (i = gspca_dev->cam.nmodes; --i >= 0; ) { 1068 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat; 1069 j = 0; 1070 for (;;) { 1071 if (fmt_tb[j] == fmt_tb[index]) 1072 break; 1073 j++; 1074 } 1075 if (j == index) { 1076 if (fmtdesc->index == index) 1077 break; /* new format */ 1078 index++; 1079 if (index >= ARRAY_SIZE(fmt_tb)) 1080 return -EINVAL; 1081 } 1082 } 1083 if (i < 0) 1084 return -EINVAL; /* no more format */ 1085 1086 fmtdesc->pixelformat = fmt_tb[index]; 1087 if (gspca_dev->cam.cam_mode[i].sizeimage < 1088 gspca_dev->cam.cam_mode[i].width * 1089 gspca_dev->cam.cam_mode[i].height) 1090 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED; 1091 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff; 1092 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff; 1093 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff; 1094 fmtdesc->description[3] = fmtdesc->pixelformat >> 24; 1095 fmtdesc->description[4] = '\0'; 1096 return 0; 1097 } 1098 1099 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 1100 struct v4l2_format *fmt) 1101 { 1102 struct gspca_dev *gspca_dev = video_drvdata(file); 1103 1104 fmt->fmt.pix = gspca_dev->pixfmt; 1105 /* some drivers use priv internally, zero it before giving it to 1106 userspace */ 1107 fmt->fmt.pix.priv = 0; 1108 return 0; 1109 } 1110 1111 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev, 1112 struct v4l2_format *fmt) 1113 { 1114 int w, h, mode, mode2; 1115 1116 w = fmt->fmt.pix.width; 1117 h = fmt->fmt.pix.height; 1118 1119 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap", 1120 fmt->fmt.pix.pixelformat, w, h); 1121 1122 /* search the closest mode for width and height */ 1123 mode = wxh_to_mode(gspca_dev, w, h); 1124 1125 /* OK if right palette */ 1126 if (gspca_dev->cam.cam_mode[mode].pixelformat 1127 != fmt->fmt.pix.pixelformat) { 1128 1129 /* else, search the closest mode with the same pixel format */ 1130 mode2 = gspca_get_mode(gspca_dev, mode, 1131 fmt->fmt.pix.pixelformat); 1132 if (mode2 >= 0) 1133 mode = mode2; 1134 } 1135 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode]; 1136 if (gspca_dev->sd_desc->try_fmt) { 1137 /* pass original resolution to subdriver try_fmt */ 1138 fmt->fmt.pix.width = w; 1139 fmt->fmt.pix.height = h; 1140 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt); 1141 } 1142 /* some drivers use priv internally, zero it before giving it to 1143 userspace */ 1144 fmt->fmt.pix.priv = 0; 1145 return mode; /* used when s_fmt */ 1146 } 1147 1148 static int vidioc_try_fmt_vid_cap(struct file *file, 1149 void *priv, 1150 struct v4l2_format *fmt) 1151 { 1152 struct gspca_dev *gspca_dev = video_drvdata(file); 1153 int ret; 1154 1155 ret = try_fmt_vid_cap(gspca_dev, fmt); 1156 if (ret < 0) 1157 return ret; 1158 return 0; 1159 } 1160 1161 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 1162 struct v4l2_format *fmt) 1163 { 1164 struct gspca_dev *gspca_dev = video_drvdata(file); 1165 int ret; 1166 1167 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1168 return -ERESTARTSYS; 1169 1170 ret = try_fmt_vid_cap(gspca_dev, fmt); 1171 if (ret < 0) 1172 goto out; 1173 1174 if (gspca_dev->nframes != 0 1175 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) { 1176 ret = -EINVAL; 1177 goto out; 1178 } 1179 1180 if (gspca_dev->streaming) { 1181 ret = -EBUSY; 1182 goto out; 1183 } 1184 gspca_dev->curr_mode = ret; 1185 if (gspca_dev->sd_desc->try_fmt) 1186 /* subdriver try_fmt can modify format parameters */ 1187 gspca_dev->pixfmt = fmt->fmt.pix; 1188 else 1189 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret]; 1190 1191 ret = 0; 1192 out: 1193 mutex_unlock(&gspca_dev->queue_lock); 1194 return ret; 1195 } 1196 1197 static int vidioc_enum_framesizes(struct file *file, void *priv, 1198 struct v4l2_frmsizeenum *fsize) 1199 { 1200 struct gspca_dev *gspca_dev = video_drvdata(file); 1201 int i; 1202 __u32 index = 0; 1203 1204 if (gspca_dev->sd_desc->enum_framesizes) 1205 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize); 1206 1207 for (i = 0; i < gspca_dev->cam.nmodes; i++) { 1208 if (fsize->pixel_format != 1209 gspca_dev->cam.cam_mode[i].pixelformat) 1210 continue; 1211 1212 if (fsize->index == index) { 1213 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 1214 fsize->discrete.width = 1215 gspca_dev->cam.cam_mode[i].width; 1216 fsize->discrete.height = 1217 gspca_dev->cam.cam_mode[i].height; 1218 return 0; 1219 } 1220 index++; 1221 } 1222 1223 return -EINVAL; 1224 } 1225 1226 static int vidioc_enum_frameintervals(struct file *filp, void *priv, 1227 struct v4l2_frmivalenum *fival) 1228 { 1229 struct gspca_dev *gspca_dev = video_drvdata(filp); 1230 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height); 1231 __u32 i; 1232 1233 if (gspca_dev->cam.mode_framerates == NULL || 1234 gspca_dev->cam.mode_framerates[mode].nrates == 0) 1235 return -EINVAL; 1236 1237 if (fival->pixel_format != 1238 gspca_dev->cam.cam_mode[mode].pixelformat) 1239 return -EINVAL; 1240 1241 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) { 1242 if (fival->index == i) { 1243 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE; 1244 fival->discrete.numerator = 1; 1245 fival->discrete.denominator = 1246 gspca_dev->cam.mode_framerates[mode].rates[i]; 1247 return 0; 1248 } 1249 } 1250 1251 return -EINVAL; 1252 } 1253 1254 static void gspca_release(struct v4l2_device *v4l2_device) 1255 { 1256 struct gspca_dev *gspca_dev = 1257 container_of(v4l2_device, struct gspca_dev, v4l2_dev); 1258 1259 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); 1260 v4l2_device_unregister(&gspca_dev->v4l2_dev); 1261 kfree(gspca_dev->usb_buf); 1262 kfree(gspca_dev); 1263 } 1264 1265 static int dev_open(struct file *file) 1266 { 1267 struct gspca_dev *gspca_dev = video_drvdata(file); 1268 int ret; 1269 1270 PDEBUG(D_STREAM, "[%s] open", current->comm); 1271 1272 /* protect the subdriver against rmmod */ 1273 if (!try_module_get(gspca_dev->module)) 1274 return -ENODEV; 1275 1276 ret = v4l2_fh_open(file); 1277 if (ret) 1278 module_put(gspca_dev->module); 1279 return ret; 1280 } 1281 1282 static int dev_close(struct file *file) 1283 { 1284 struct gspca_dev *gspca_dev = video_drvdata(file); 1285 1286 PDEBUG(D_STREAM, "[%s] close", current->comm); 1287 1288 /* Needed for gspca_stream_off, always lock before queue_lock! */ 1289 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) 1290 return -ERESTARTSYS; 1291 1292 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) { 1293 mutex_unlock(&gspca_dev->usb_lock); 1294 return -ERESTARTSYS; 1295 } 1296 1297 /* if the file did the capture, free the streaming resources */ 1298 if (gspca_dev->capt_file == file) { 1299 if (gspca_dev->streaming) 1300 gspca_stream_off(gspca_dev); 1301 frame_free(gspca_dev); 1302 } 1303 module_put(gspca_dev->module); 1304 mutex_unlock(&gspca_dev->queue_lock); 1305 mutex_unlock(&gspca_dev->usb_lock); 1306 1307 PDEBUG(D_STREAM, "close done"); 1308 1309 return v4l2_fh_release(file); 1310 } 1311 1312 static int vidioc_querycap(struct file *file, void *priv, 1313 struct v4l2_capability *cap) 1314 { 1315 struct gspca_dev *gspca_dev = video_drvdata(file); 1316 1317 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name, 1318 sizeof cap->driver); 1319 if (gspca_dev->dev->product != NULL) { 1320 strlcpy((char *) cap->card, gspca_dev->dev->product, 1321 sizeof cap->card); 1322 } else { 1323 snprintf((char *) cap->card, sizeof cap->card, 1324 "USB Camera (%04x:%04x)", 1325 le16_to_cpu(gspca_dev->dev->descriptor.idVendor), 1326 le16_to_cpu(gspca_dev->dev->descriptor.idProduct)); 1327 } 1328 usb_make_path(gspca_dev->dev, (char *) cap->bus_info, 1329 sizeof(cap->bus_info)); 1330 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE 1331 | V4L2_CAP_STREAMING 1332 | V4L2_CAP_READWRITE; 1333 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 1334 return 0; 1335 } 1336 1337 static int vidioc_enum_input(struct file *file, void *priv, 1338 struct v4l2_input *input) 1339 { 1340 struct gspca_dev *gspca_dev = video_drvdata(file); 1341 1342 if (input->index != 0) 1343 return -EINVAL; 1344 input->type = V4L2_INPUT_TYPE_CAMERA; 1345 input->status = gspca_dev->cam.input_flags; 1346 strlcpy(input->name, gspca_dev->sd_desc->name, 1347 sizeof input->name); 1348 return 0; 1349 } 1350 1351 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 1352 { 1353 *i = 0; 1354 return 0; 1355 } 1356 1357 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 1358 { 1359 if (i > 0) 1360 return -EINVAL; 1361 return (0); 1362 } 1363 1364 static int vidioc_reqbufs(struct file *file, void *priv, 1365 struct v4l2_requestbuffers *rb) 1366 { 1367 struct gspca_dev *gspca_dev = video_drvdata(file); 1368 int i, ret = 0, streaming; 1369 1370 i = rb->memory; /* (avoid compilation warning) */ 1371 switch (i) { 1372 case GSPCA_MEMORY_READ: /* (internal call) */ 1373 case V4L2_MEMORY_MMAP: 1374 case V4L2_MEMORY_USERPTR: 1375 break; 1376 default: 1377 return -EINVAL; 1378 } 1379 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1380 return -ERESTARTSYS; 1381 1382 if (gspca_dev->memory != GSPCA_MEMORY_NO 1383 && gspca_dev->memory != GSPCA_MEMORY_READ 1384 && gspca_dev->memory != rb->memory) { 1385 ret = -EBUSY; 1386 goto out; 1387 } 1388 1389 /* only one file may do the capture */ 1390 if (gspca_dev->capt_file != NULL 1391 && gspca_dev->capt_file != file) { 1392 ret = -EBUSY; 1393 goto out; 1394 } 1395 1396 /* if allocated, the buffers must not be mapped */ 1397 for (i = 0; i < gspca_dev->nframes; i++) { 1398 if (gspca_dev->frame[i].vma_use_count) { 1399 ret = -EBUSY; 1400 goto out; 1401 } 1402 } 1403 1404 /* stop streaming */ 1405 streaming = gspca_dev->streaming; 1406 if (streaming) { 1407 gspca_stream_off(gspca_dev); 1408 1409 /* Don't restart the stream when switching from read 1410 * to mmap mode */ 1411 if (gspca_dev->memory == GSPCA_MEMORY_READ) 1412 streaming = 0; 1413 } 1414 1415 /* free the previous allocated buffers, if any */ 1416 if (gspca_dev->nframes != 0) 1417 frame_free(gspca_dev); 1418 if (rb->count == 0) /* unrequest */ 1419 goto out; 1420 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count); 1421 if (ret == 0) { 1422 rb->count = gspca_dev->nframes; 1423 if (streaming) 1424 ret = gspca_init_transfer(gspca_dev); 1425 } 1426 out: 1427 mutex_unlock(&gspca_dev->queue_lock); 1428 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count); 1429 return ret; 1430 } 1431 1432 static int vidioc_querybuf(struct file *file, void *priv, 1433 struct v4l2_buffer *v4l2_buf) 1434 { 1435 struct gspca_dev *gspca_dev = video_drvdata(file); 1436 struct gspca_frame *frame; 1437 1438 if (v4l2_buf->index >= gspca_dev->nframes) 1439 return -EINVAL; 1440 1441 frame = &gspca_dev->frame[v4l2_buf->index]; 1442 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); 1443 return 0; 1444 } 1445 1446 static int vidioc_streamon(struct file *file, void *priv, 1447 enum v4l2_buf_type buf_type) 1448 { 1449 struct gspca_dev *gspca_dev = video_drvdata(file); 1450 int ret; 1451 1452 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 1453 return -EINVAL; 1454 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1455 return -ERESTARTSYS; 1456 1457 /* check the capture file */ 1458 if (gspca_dev->capt_file != file) { 1459 ret = -EBUSY; 1460 goto out; 1461 } 1462 1463 if (gspca_dev->nframes == 0 1464 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) { 1465 ret = -EINVAL; 1466 goto out; 1467 } 1468 if (!gspca_dev->streaming) { 1469 ret = gspca_init_transfer(gspca_dev); 1470 if (ret < 0) 1471 goto out; 1472 } 1473 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK", 1474 gspca_dev->pixfmt.pixelformat, 1475 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height); 1476 ret = 0; 1477 out: 1478 mutex_unlock(&gspca_dev->queue_lock); 1479 return ret; 1480 } 1481 1482 static int vidioc_streamoff(struct file *file, void *priv, 1483 enum v4l2_buf_type buf_type) 1484 { 1485 struct gspca_dev *gspca_dev = video_drvdata(file); 1486 int i, ret; 1487 1488 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 1489 return -EINVAL; 1490 1491 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1492 return -ERESTARTSYS; 1493 1494 if (!gspca_dev->streaming) { 1495 ret = 0; 1496 goto out; 1497 } 1498 1499 /* check the capture file */ 1500 if (gspca_dev->capt_file != file) { 1501 ret = -EBUSY; 1502 goto out; 1503 } 1504 1505 /* stop streaming */ 1506 gspca_stream_off(gspca_dev); 1507 /* In case another thread is waiting in dqbuf */ 1508 wake_up_interruptible(&gspca_dev->wq); 1509 1510 /* empty the transfer queues */ 1511 for (i = 0; i < gspca_dev->nframes; i++) 1512 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS; 1513 atomic_set(&gspca_dev->fr_q, 0); 1514 atomic_set(&gspca_dev->fr_i, 0); 1515 gspca_dev->fr_o = 0; 1516 ret = 0; 1517 out: 1518 mutex_unlock(&gspca_dev->queue_lock); 1519 return ret; 1520 } 1521 1522 static int vidioc_g_jpegcomp(struct file *file, void *priv, 1523 struct v4l2_jpegcompression *jpegcomp) 1524 { 1525 struct gspca_dev *gspca_dev = video_drvdata(file); 1526 1527 gspca_dev->usb_err = 0; 1528 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp); 1529 } 1530 1531 static int vidioc_s_jpegcomp(struct file *file, void *priv, 1532 const struct v4l2_jpegcompression *jpegcomp) 1533 { 1534 struct gspca_dev *gspca_dev = video_drvdata(file); 1535 1536 gspca_dev->usb_err = 0; 1537 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp); 1538 } 1539 1540 static int vidioc_g_parm(struct file *filp, void *priv, 1541 struct v4l2_streamparm *parm) 1542 { 1543 struct gspca_dev *gspca_dev = video_drvdata(filp); 1544 1545 parm->parm.capture.readbuffers = gspca_dev->nbufread; 1546 1547 if (gspca_dev->sd_desc->get_streamparm) { 1548 gspca_dev->usb_err = 0; 1549 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm); 1550 return gspca_dev->usb_err; 1551 } 1552 return 0; 1553 } 1554 1555 static int vidioc_s_parm(struct file *filp, void *priv, 1556 struct v4l2_streamparm *parm) 1557 { 1558 struct gspca_dev *gspca_dev = video_drvdata(filp); 1559 int n; 1560 1561 n = parm->parm.capture.readbuffers; 1562 if (n == 0 || n >= GSPCA_MAX_FRAMES) 1563 parm->parm.capture.readbuffers = gspca_dev->nbufread; 1564 else 1565 gspca_dev->nbufread = n; 1566 1567 if (gspca_dev->sd_desc->set_streamparm) { 1568 gspca_dev->usb_err = 0; 1569 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm); 1570 return gspca_dev->usb_err; 1571 } 1572 1573 return 0; 1574 } 1575 1576 static int dev_mmap(struct file *file, struct vm_area_struct *vma) 1577 { 1578 struct gspca_dev *gspca_dev = video_drvdata(file); 1579 struct gspca_frame *frame; 1580 struct page *page; 1581 unsigned long addr, start, size; 1582 int i, ret; 1583 1584 start = vma->vm_start; 1585 size = vma->vm_end - vma->vm_start; 1586 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size); 1587 1588 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1589 return -ERESTARTSYS; 1590 if (gspca_dev->capt_file != file) { 1591 ret = -EINVAL; 1592 goto out; 1593 } 1594 1595 frame = NULL; 1596 for (i = 0; i < gspca_dev->nframes; ++i) { 1597 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) { 1598 PDEBUG(D_STREAM, "mmap bad memory type"); 1599 break; 1600 } 1601 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT) 1602 == vma->vm_pgoff) { 1603 frame = &gspca_dev->frame[i]; 1604 break; 1605 } 1606 } 1607 if (frame == NULL) { 1608 PDEBUG(D_STREAM, "mmap no frame buffer found"); 1609 ret = -EINVAL; 1610 goto out; 1611 } 1612 if (size != frame->v4l2_buf.length) { 1613 PDEBUG(D_STREAM, "mmap bad size"); 1614 ret = -EINVAL; 1615 goto out; 1616 } 1617 1618 /* 1619 * - VM_IO marks the area as being a mmaped region for I/O to a 1620 * device. It also prevents the region from being core dumped. 1621 */ 1622 vma->vm_flags |= VM_IO; 1623 1624 addr = (unsigned long) frame->data; 1625 while (size > 0) { 1626 page = vmalloc_to_page((void *) addr); 1627 ret = vm_insert_page(vma, start, page); 1628 if (ret < 0) 1629 goto out; 1630 start += PAGE_SIZE; 1631 addr += PAGE_SIZE; 1632 size -= PAGE_SIZE; 1633 } 1634 1635 vma->vm_ops = &gspca_vm_ops; 1636 vma->vm_private_data = frame; 1637 gspca_vm_open(vma); 1638 ret = 0; 1639 out: 1640 mutex_unlock(&gspca_dev->queue_lock); 1641 return ret; 1642 } 1643 1644 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file, 1645 enum v4l2_memory memory) 1646 { 1647 if (!gspca_dev->present) 1648 return -ENODEV; 1649 if (gspca_dev->capt_file != file || gspca_dev->memory != memory || 1650 !gspca_dev->streaming) 1651 return -EINVAL; 1652 1653 /* check if a frame is ready */ 1654 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i); 1655 } 1656 1657 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file, 1658 enum v4l2_memory memory) 1659 { 1660 int ret; 1661 1662 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1663 return -ERESTARTSYS; 1664 ret = frame_ready_nolock(gspca_dev, file, memory); 1665 mutex_unlock(&gspca_dev->queue_lock); 1666 return ret; 1667 } 1668 1669 /* 1670 * dequeue a video buffer 1671 * 1672 * If nonblock_ing is false, block until a buffer is available. 1673 */ 1674 static int vidioc_dqbuf(struct file *file, void *priv, 1675 struct v4l2_buffer *v4l2_buf) 1676 { 1677 struct gspca_dev *gspca_dev = video_drvdata(file); 1678 struct gspca_frame *frame; 1679 int i, j, ret; 1680 1681 PDEBUG(D_FRAM, "dqbuf"); 1682 1683 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1684 return -ERESTARTSYS; 1685 1686 for (;;) { 1687 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory); 1688 if (ret < 0) 1689 goto out; 1690 if (ret > 0) 1691 break; 1692 1693 mutex_unlock(&gspca_dev->queue_lock); 1694 1695 if (file->f_flags & O_NONBLOCK) 1696 return -EAGAIN; 1697 1698 /* wait till a frame is ready */ 1699 ret = wait_event_interruptible_timeout(gspca_dev->wq, 1700 frame_ready(gspca_dev, file, v4l2_buf->memory), 1701 msecs_to_jiffies(3000)); 1702 if (ret < 0) 1703 return ret; 1704 if (ret == 0) 1705 return -EIO; 1706 1707 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1708 return -ERESTARTSYS; 1709 } 1710 1711 i = gspca_dev->fr_o; 1712 j = gspca_dev->fr_queue[i]; 1713 frame = &gspca_dev->frame[j]; 1714 1715 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES; 1716 1717 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; 1718 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); 1719 PDEBUG(D_FRAM, "dqbuf %d", j); 1720 ret = 0; 1721 1722 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) { 1723 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr, 1724 frame->data, 1725 frame->v4l2_buf.bytesused)) { 1726 PERR("dqbuf cp to user failed"); 1727 ret = -EFAULT; 1728 } 1729 } 1730 out: 1731 mutex_unlock(&gspca_dev->queue_lock); 1732 1733 if (ret == 0 && gspca_dev->sd_desc->dq_callback) { 1734 mutex_lock(&gspca_dev->usb_lock); 1735 gspca_dev->usb_err = 0; 1736 if (gspca_dev->present) 1737 gspca_dev->sd_desc->dq_callback(gspca_dev); 1738 mutex_unlock(&gspca_dev->usb_lock); 1739 } 1740 1741 return ret; 1742 } 1743 1744 /* 1745 * queue a video buffer 1746 * 1747 * Attempting to queue a buffer that has already been 1748 * queued will return -EINVAL. 1749 */ 1750 static int vidioc_qbuf(struct file *file, void *priv, 1751 struct v4l2_buffer *v4l2_buf) 1752 { 1753 struct gspca_dev *gspca_dev = video_drvdata(file); 1754 struct gspca_frame *frame; 1755 int i, index, ret; 1756 1757 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index); 1758 1759 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1760 return -ERESTARTSYS; 1761 1762 index = v4l2_buf->index; 1763 if ((unsigned) index >= gspca_dev->nframes) { 1764 PDEBUG(D_FRAM, 1765 "qbuf idx %d >= %d", index, gspca_dev->nframes); 1766 ret = -EINVAL; 1767 goto out; 1768 } 1769 if (v4l2_buf->memory != gspca_dev->memory) { 1770 PDEBUG(D_FRAM, "qbuf bad memory type"); 1771 ret = -EINVAL; 1772 goto out; 1773 } 1774 1775 frame = &gspca_dev->frame[index]; 1776 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) { 1777 PDEBUG(D_FRAM, "qbuf bad state"); 1778 ret = -EINVAL; 1779 goto out; 1780 } 1781 1782 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED; 1783 1784 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) { 1785 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr; 1786 frame->v4l2_buf.length = v4l2_buf->length; 1787 } 1788 1789 /* put the buffer in the 'queued' queue */ 1790 i = atomic_read(&gspca_dev->fr_q); 1791 gspca_dev->fr_queue[i] = index; 1792 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES); 1793 1794 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED; 1795 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE; 1796 ret = 0; 1797 out: 1798 mutex_unlock(&gspca_dev->queue_lock); 1799 return ret; 1800 } 1801 1802 /* 1803 * allocate the resources for read() 1804 */ 1805 static int read_alloc(struct gspca_dev *gspca_dev, 1806 struct file *file) 1807 { 1808 struct v4l2_buffer v4l2_buf; 1809 int i, ret; 1810 1811 PDEBUG(D_STREAM, "read alloc"); 1812 1813 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) 1814 return -ERESTARTSYS; 1815 1816 if (gspca_dev->nframes == 0) { 1817 struct v4l2_requestbuffers rb; 1818 1819 memset(&rb, 0, sizeof rb); 1820 rb.count = gspca_dev->nbufread; 1821 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1822 rb.memory = GSPCA_MEMORY_READ; 1823 ret = vidioc_reqbufs(file, gspca_dev, &rb); 1824 if (ret != 0) { 1825 PDEBUG(D_STREAM, "read reqbuf err %d", ret); 1826 goto out; 1827 } 1828 memset(&v4l2_buf, 0, sizeof v4l2_buf); 1829 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1830 v4l2_buf.memory = GSPCA_MEMORY_READ; 1831 for (i = 0; i < gspca_dev->nbufread; i++) { 1832 v4l2_buf.index = i; 1833 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf); 1834 if (ret != 0) { 1835 PDEBUG(D_STREAM, "read qbuf err: %d", ret); 1836 goto out; 1837 } 1838 } 1839 } 1840 1841 /* start streaming */ 1842 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE); 1843 if (ret != 0) 1844 PDEBUG(D_STREAM, "read streamon err %d", ret); 1845 out: 1846 mutex_unlock(&gspca_dev->usb_lock); 1847 return ret; 1848 } 1849 1850 static unsigned int dev_poll(struct file *file, poll_table *wait) 1851 { 1852 struct gspca_dev *gspca_dev = video_drvdata(file); 1853 unsigned long req_events = poll_requested_events(wait); 1854 int ret = 0; 1855 1856 PDEBUG(D_FRAM, "poll"); 1857 1858 if (req_events & POLLPRI) 1859 ret |= v4l2_ctrl_poll(file, wait); 1860 1861 if (req_events & (POLLIN | POLLRDNORM)) { 1862 /* if reqbufs is not done, the user would use read() */ 1863 if (gspca_dev->memory == GSPCA_MEMORY_NO) { 1864 if (read_alloc(gspca_dev, file) != 0) { 1865 ret |= POLLERR; 1866 goto out; 1867 } 1868 } 1869 1870 poll_wait(file, &gspca_dev->wq, wait); 1871 1872 /* check if an image has been received */ 1873 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) { 1874 ret |= POLLERR; 1875 goto out; 1876 } 1877 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i)) 1878 ret |= POLLIN | POLLRDNORM; 1879 mutex_unlock(&gspca_dev->queue_lock); 1880 } 1881 1882 out: 1883 if (!gspca_dev->present) 1884 ret |= POLLHUP; 1885 1886 return ret; 1887 } 1888 1889 static ssize_t dev_read(struct file *file, char __user *data, 1890 size_t count, loff_t *ppos) 1891 { 1892 struct gspca_dev *gspca_dev = video_drvdata(file); 1893 struct gspca_frame *frame; 1894 struct v4l2_buffer v4l2_buf; 1895 struct timeval timestamp; 1896 int n, ret, ret2; 1897 1898 PDEBUG(D_FRAM, "read (%zd)", count); 1899 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */ 1900 ret = read_alloc(gspca_dev, file); 1901 if (ret != 0) 1902 return ret; 1903 } 1904 1905 /* get a frame */ 1906 timestamp = ktime_to_timeval(ktime_get()); 1907 timestamp.tv_sec--; 1908 n = 2; 1909 for (;;) { 1910 memset(&v4l2_buf, 0, sizeof v4l2_buf); 1911 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1912 v4l2_buf.memory = GSPCA_MEMORY_READ; 1913 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf); 1914 if (ret != 0) { 1915 PDEBUG(D_STREAM, "read dqbuf err %d", ret); 1916 return ret; 1917 } 1918 1919 /* if the process slept for more than 1 second, 1920 * get a newer frame */ 1921 frame = &gspca_dev->frame[v4l2_buf.index]; 1922 if (--n < 0) 1923 break; /* avoid infinite loop */ 1924 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec) 1925 break; 1926 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf); 1927 if (ret != 0) { 1928 PDEBUG(D_STREAM, "read qbuf err %d", ret); 1929 return ret; 1930 } 1931 } 1932 1933 /* copy the frame */ 1934 if (count > frame->v4l2_buf.bytesused) 1935 count = frame->v4l2_buf.bytesused; 1936 ret = copy_to_user(data, frame->data, count); 1937 if (ret != 0) { 1938 PERR("read cp to user lack %d / %zd", ret, count); 1939 ret = -EFAULT; 1940 goto out; 1941 } 1942 ret = count; 1943 out: 1944 /* in each case, requeue the buffer */ 1945 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf); 1946 if (ret2 != 0) 1947 return ret2; 1948 return ret; 1949 } 1950 1951 static struct v4l2_file_operations dev_fops = { 1952 .owner = THIS_MODULE, 1953 .open = dev_open, 1954 .release = dev_close, 1955 .read = dev_read, 1956 .mmap = dev_mmap, 1957 .unlocked_ioctl = video_ioctl2, 1958 .poll = dev_poll, 1959 }; 1960 1961 static const struct v4l2_ioctl_ops dev_ioctl_ops = { 1962 .vidioc_querycap = vidioc_querycap, 1963 .vidioc_dqbuf = vidioc_dqbuf, 1964 .vidioc_qbuf = vidioc_qbuf, 1965 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 1966 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 1967 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 1968 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 1969 .vidioc_streamon = vidioc_streamon, 1970 .vidioc_enum_input = vidioc_enum_input, 1971 .vidioc_g_input = vidioc_g_input, 1972 .vidioc_s_input = vidioc_s_input, 1973 .vidioc_reqbufs = vidioc_reqbufs, 1974 .vidioc_querybuf = vidioc_querybuf, 1975 .vidioc_streamoff = vidioc_streamoff, 1976 .vidioc_g_jpegcomp = vidioc_g_jpegcomp, 1977 .vidioc_s_jpegcomp = vidioc_s_jpegcomp, 1978 .vidioc_g_parm = vidioc_g_parm, 1979 .vidioc_s_parm = vidioc_s_parm, 1980 .vidioc_enum_framesizes = vidioc_enum_framesizes, 1981 .vidioc_enum_frameintervals = vidioc_enum_frameintervals, 1982 #ifdef CONFIG_VIDEO_ADV_DEBUG 1983 .vidioc_g_chip_info = vidioc_g_chip_info, 1984 .vidioc_g_register = vidioc_g_register, 1985 .vidioc_s_register = vidioc_s_register, 1986 #endif 1987 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 1988 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 1989 }; 1990 1991 static const struct video_device gspca_template = { 1992 .name = "gspca main driver", 1993 .fops = &dev_fops, 1994 .ioctl_ops = &dev_ioctl_ops, 1995 .release = video_device_release_empty, /* We use v4l2_dev.release */ 1996 }; 1997 1998 /* 1999 * probe and create a new gspca device 2000 * 2001 * This function must be called by the sub-driver when it is 2002 * called for probing a new device. 2003 */ 2004 int gspca_dev_probe2(struct usb_interface *intf, 2005 const struct usb_device_id *id, 2006 const struct sd_desc *sd_desc, 2007 int dev_size, 2008 struct module *module) 2009 { 2010 struct gspca_dev *gspca_dev; 2011 struct usb_device *dev = interface_to_usbdev(intf); 2012 int ret; 2013 2014 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n", 2015 sd_desc->name, id->idVendor, id->idProduct); 2016 2017 /* create the device */ 2018 if (dev_size < sizeof *gspca_dev) 2019 dev_size = sizeof *gspca_dev; 2020 gspca_dev = kzalloc(dev_size, GFP_KERNEL); 2021 if (!gspca_dev) { 2022 pr_err("couldn't kzalloc gspca struct\n"); 2023 return -ENOMEM; 2024 } 2025 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL); 2026 if (!gspca_dev->usb_buf) { 2027 pr_err("out of memory\n"); 2028 ret = -ENOMEM; 2029 goto out; 2030 } 2031 gspca_dev->dev = dev; 2032 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber; 2033 2034 /* check if any audio device */ 2035 if (dev->actconfig->desc.bNumInterfaces != 1) { 2036 int i; 2037 struct usb_interface *intf2; 2038 2039 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 2040 intf2 = dev->actconfig->interface[i]; 2041 if (intf2 != NULL 2042 && intf2->altsetting != NULL 2043 && intf2->altsetting->desc.bInterfaceClass == 2044 USB_CLASS_AUDIO) { 2045 gspca_dev->audio = 1; 2046 break; 2047 } 2048 } 2049 } 2050 2051 gspca_dev->v4l2_dev.release = gspca_release; 2052 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev); 2053 if (ret) 2054 goto out; 2055 gspca_dev->sd_desc = sd_desc; 2056 gspca_dev->nbufread = 2; 2057 gspca_dev->empty_packet = -1; /* don't check the empty packets */ 2058 gspca_dev->vdev = gspca_template; 2059 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev; 2060 video_set_drvdata(&gspca_dev->vdev, gspca_dev); 2061 set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags); 2062 gspca_dev->module = module; 2063 gspca_dev->present = 1; 2064 2065 mutex_init(&gspca_dev->usb_lock); 2066 gspca_dev->vdev.lock = &gspca_dev->usb_lock; 2067 mutex_init(&gspca_dev->queue_lock); 2068 init_waitqueue_head(&gspca_dev->wq); 2069 2070 /* configure the subdriver and initialize the USB device */ 2071 ret = sd_desc->config(gspca_dev, id); 2072 if (ret < 0) 2073 goto out; 2074 ret = sd_desc->init(gspca_dev); 2075 if (ret < 0) 2076 goto out; 2077 if (sd_desc->init_controls) 2078 ret = sd_desc->init_controls(gspca_dev); 2079 if (ret < 0) 2080 goto out; 2081 gspca_set_default_mode(gspca_dev); 2082 2083 ret = gspca_input_connect(gspca_dev); 2084 if (ret) 2085 goto out; 2086 2087 /* 2088 * Don't take usb_lock for these ioctls. This improves latency if 2089 * usb_lock is taken for a long time, e.g. when changing a control 2090 * value, and a new frame is ready to be dequeued. 2091 */ 2092 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF); 2093 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF); 2094 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF); 2095 #ifdef CONFIG_VIDEO_ADV_DEBUG 2096 if (!gspca_dev->sd_desc->get_register) 2097 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER); 2098 if (!gspca_dev->sd_desc->set_register) 2099 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER); 2100 #endif 2101 if (!gspca_dev->sd_desc->get_jcomp) 2102 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP); 2103 if (!gspca_dev->sd_desc->set_jcomp) 2104 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP); 2105 2106 /* init video stuff */ 2107 ret = video_register_device(&gspca_dev->vdev, 2108 VFL_TYPE_GRABBER, 2109 -1); 2110 if (ret < 0) { 2111 pr_err("video_register_device err %d\n", ret); 2112 goto out; 2113 } 2114 2115 usb_set_intfdata(intf, gspca_dev); 2116 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev)); 2117 2118 gspca_input_create_urb(gspca_dev); 2119 2120 return 0; 2121 out: 2122 #if IS_ENABLED(CONFIG_INPUT) 2123 if (gspca_dev->input_dev) 2124 input_unregister_device(gspca_dev->input_dev); 2125 #endif 2126 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); 2127 kfree(gspca_dev->usb_buf); 2128 kfree(gspca_dev); 2129 return ret; 2130 } 2131 EXPORT_SYMBOL(gspca_dev_probe2); 2132 2133 /* same function as the previous one, but check the interface */ 2134 int gspca_dev_probe(struct usb_interface *intf, 2135 const struct usb_device_id *id, 2136 const struct sd_desc *sd_desc, 2137 int dev_size, 2138 struct module *module) 2139 { 2140 struct usb_device *dev = interface_to_usbdev(intf); 2141 2142 /* we don't handle multi-config cameras */ 2143 if (dev->descriptor.bNumConfigurations != 1) { 2144 pr_err("%04x:%04x too many config\n", 2145 id->idVendor, id->idProduct); 2146 return -ENODEV; 2147 } 2148 2149 /* the USB video interface must be the first one */ 2150 if (dev->actconfig->desc.bNumInterfaces != 1 2151 && intf->cur_altsetting->desc.bInterfaceNumber != 0) 2152 return -ENODEV; 2153 2154 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module); 2155 } 2156 EXPORT_SYMBOL(gspca_dev_probe); 2157 2158 /* 2159 * USB disconnection 2160 * 2161 * This function must be called by the sub-driver 2162 * when the device disconnects, after the specific resources are freed. 2163 */ 2164 void gspca_disconnect(struct usb_interface *intf) 2165 { 2166 struct gspca_dev *gspca_dev = usb_get_intfdata(intf); 2167 #if IS_ENABLED(CONFIG_INPUT) 2168 struct input_dev *input_dev; 2169 #endif 2170 2171 PDEBUG(D_PROBE, "%s disconnect", 2172 video_device_node_name(&gspca_dev->vdev)); 2173 2174 mutex_lock(&gspca_dev->usb_lock); 2175 2176 gspca_dev->present = 0; 2177 destroy_urbs(gspca_dev); 2178 2179 #if IS_ENABLED(CONFIG_INPUT) 2180 gspca_input_destroy_urb(gspca_dev); 2181 input_dev = gspca_dev->input_dev; 2182 if (input_dev) { 2183 gspca_dev->input_dev = NULL; 2184 input_unregister_device(input_dev); 2185 } 2186 #endif 2187 /* Free subdriver's streaming resources / stop sd workqueue(s) */ 2188 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming) 2189 gspca_dev->sd_desc->stop0(gspca_dev); 2190 gspca_dev->streaming = 0; 2191 gspca_dev->dev = NULL; 2192 wake_up_interruptible(&gspca_dev->wq); 2193 2194 v4l2_device_disconnect(&gspca_dev->v4l2_dev); 2195 video_unregister_device(&gspca_dev->vdev); 2196 2197 mutex_unlock(&gspca_dev->usb_lock); 2198 2199 /* (this will call gspca_release() immediately or on last close) */ 2200 v4l2_device_put(&gspca_dev->v4l2_dev); 2201 } 2202 EXPORT_SYMBOL(gspca_disconnect); 2203 2204 #ifdef CONFIG_PM 2205 int gspca_suspend(struct usb_interface *intf, pm_message_t message) 2206 { 2207 struct gspca_dev *gspca_dev = usb_get_intfdata(intf); 2208 2209 gspca_input_destroy_urb(gspca_dev); 2210 2211 if (!gspca_dev->streaming) 2212 return 0; 2213 2214 mutex_lock(&gspca_dev->usb_lock); 2215 gspca_dev->frozen = 1; /* avoid urb error messages */ 2216 gspca_dev->usb_err = 0; 2217 if (gspca_dev->sd_desc->stopN) 2218 gspca_dev->sd_desc->stopN(gspca_dev); 2219 destroy_urbs(gspca_dev); 2220 gspca_set_alt0(gspca_dev); 2221 if (gspca_dev->sd_desc->stop0) 2222 gspca_dev->sd_desc->stop0(gspca_dev); 2223 mutex_unlock(&gspca_dev->usb_lock); 2224 2225 return 0; 2226 } 2227 EXPORT_SYMBOL(gspca_suspend); 2228 2229 int gspca_resume(struct usb_interface *intf) 2230 { 2231 struct gspca_dev *gspca_dev = usb_get_intfdata(intf); 2232 int streaming, ret = 0; 2233 2234 mutex_lock(&gspca_dev->usb_lock); 2235 gspca_dev->frozen = 0; 2236 gspca_dev->usb_err = 0; 2237 gspca_dev->sd_desc->init(gspca_dev); 2238 /* 2239 * Most subdrivers send all ctrl values on sd_start and thus 2240 * only write to the device registers on s_ctrl when streaming -> 2241 * Clear streaming to avoid setting all ctrls twice. 2242 */ 2243 streaming = gspca_dev->streaming; 2244 gspca_dev->streaming = 0; 2245 if (streaming) 2246 ret = gspca_init_transfer(gspca_dev); 2247 else 2248 gspca_input_create_urb(gspca_dev); 2249 mutex_unlock(&gspca_dev->usb_lock); 2250 2251 return ret; 2252 } 2253 EXPORT_SYMBOL(gspca_resume); 2254 #endif 2255 2256 /* -- module insert / remove -- */ 2257 static int __init gspca_init(void) 2258 { 2259 pr_info("v" GSPCA_VERSION " registered\n"); 2260 return 0; 2261 } 2262 static void __exit gspca_exit(void) 2263 { 2264 } 2265 2266 module_init(gspca_init); 2267 module_exit(gspca_exit); 2268 2269 module_param_named(debug, gspca_debug, int, 0644); 2270 MODULE_PARM_DESC(debug, 2271 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo"); 2272