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 v4l2_get_timestamp(&frame->v4l2_buf.timestamp); 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 = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 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 * If xfer_ep is invalid, return the first valid ep found, otherwise 609 * look for exactly the ep with address equal to xfer_ep. 610 */ 611 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt, 612 int xfer, int xfer_ep) 613 { 614 struct usb_host_endpoint *ep; 615 int i, attr; 616 617 for (i = 0; i < alt->desc.bNumEndpoints; i++) { 618 ep = &alt->endpoint[i]; 619 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; 620 if (attr == xfer 621 && ep->desc.wMaxPacketSize != 0 622 && usb_endpoint_dir_in(&ep->desc) 623 && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep)) 624 return ep; 625 } 626 return NULL; 627 } 628 629 /* compute the minimum bandwidth for the current transfer */ 630 static u32 which_bandwidth(struct gspca_dev *gspca_dev) 631 { 632 u32 bandwidth; 633 634 /* get the (max) image size */ 635 bandwidth = gspca_dev->pixfmt.sizeimage; 636 637 /* if the image is compressed, estimate its mean size */ 638 if (!gspca_dev->cam.needs_full_bandwidth && 639 bandwidth < gspca_dev->pixfmt.width * 640 gspca_dev->pixfmt.height) 641 bandwidth = bandwidth * 3 / 8; /* 0.375 */ 642 643 /* estimate the frame rate */ 644 if (gspca_dev->sd_desc->get_streamparm) { 645 struct v4l2_streamparm parm; 646 647 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm); 648 bandwidth *= parm.parm.capture.timeperframe.denominator; 649 bandwidth /= parm.parm.capture.timeperframe.numerator; 650 } else { 651 652 /* don't hope more than 15 fps with USB 1.1 and 653 * image resolution >= 640x480 */ 654 if (gspca_dev->pixfmt.width >= 640 655 && gspca_dev->dev->speed == USB_SPEED_FULL) 656 bandwidth *= 15; /* 15 fps */ 657 else 658 bandwidth *= 30; /* 30 fps */ 659 } 660 661 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth); 662 return bandwidth; 663 } 664 665 /* endpoint table */ 666 #define MAX_ALT 16 667 struct ep_tb_s { 668 u32 alt; 669 u32 bandwidth; 670 }; 671 672 /* 673 * build the table of the endpoints 674 * and compute the minimum bandwidth for the image transfer 675 */ 676 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev, 677 struct usb_interface *intf, 678 struct ep_tb_s *ep_tb) 679 { 680 struct usb_host_endpoint *ep; 681 int i, j, nbalt, psize, found; 682 u32 bandwidth, last_bw; 683 684 nbalt = intf->num_altsetting; 685 if (nbalt > MAX_ALT) 686 nbalt = MAX_ALT; /* fixme: should warn */ 687 688 /* build the endpoint table */ 689 i = 0; 690 last_bw = 0; 691 for (;;) { 692 ep_tb->bandwidth = 2000 * 2000 * 120; 693 found = 0; 694 for (j = 0; j < nbalt; j++) { 695 ep = alt_xfer(&intf->altsetting[j], 696 USB_ENDPOINT_XFER_ISOC, 697 gspca_dev->xfer_ep); 698 if (ep == NULL) 699 continue; 700 if (ep->desc.bInterval == 0) { 701 pr_err("alt %d iso endp with 0 interval\n", j); 702 continue; 703 } 704 psize = le16_to_cpu(ep->desc.wMaxPacketSize); 705 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); 706 bandwidth = psize * 1000; 707 if (gspca_dev->dev->speed == USB_SPEED_HIGH 708 || gspca_dev->dev->speed >= USB_SPEED_SUPER) 709 bandwidth *= 8; 710 bandwidth /= 1 << (ep->desc.bInterval - 1); 711 if (bandwidth <= last_bw) 712 continue; 713 if (bandwidth < ep_tb->bandwidth) { 714 ep_tb->bandwidth = bandwidth; 715 ep_tb->alt = j; 716 found = 1; 717 } 718 } 719 if (!found) 720 break; 721 PDEBUG(D_STREAM, "alt %d bandwidth %d", 722 ep_tb->alt, ep_tb->bandwidth); 723 last_bw = ep_tb->bandwidth; 724 i++; 725 ep_tb++; 726 } 727 728 /* 729 * If the camera: 730 * has a usb audio class interface (a built in usb mic); and 731 * is a usb 1 full speed device; and 732 * uses the max full speed iso bandwidth; and 733 * and has more than 1 alt setting 734 * then skip the highest alt setting to spare bandwidth for the mic 735 */ 736 if (gspca_dev->audio && 737 gspca_dev->dev->speed == USB_SPEED_FULL && 738 last_bw >= 1000000 && 739 i > 1) { 740 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt"); 741 i--; 742 ep_tb--; 743 } 744 745 /* get the requested bandwidth and start at the highest atlsetting */ 746 bandwidth = which_bandwidth(gspca_dev); 747 ep_tb--; 748 while (i > 1) { 749 ep_tb--; 750 if (ep_tb->bandwidth < bandwidth) 751 break; 752 i--; 753 } 754 return i; 755 } 756 757 /* 758 * create the URBs for image transfer 759 */ 760 static int create_urbs(struct gspca_dev *gspca_dev, 761 struct usb_host_endpoint *ep) 762 { 763 struct urb *urb; 764 int n, nurbs, i, psize, npkt, bsize; 765 766 /* calculate the packet size and the number of packets */ 767 psize = le16_to_cpu(ep->desc.wMaxPacketSize); 768 769 if (!gspca_dev->cam.bulk) { /* isoc */ 770 771 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */ 772 if (gspca_dev->pkt_size == 0) 773 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); 774 else 775 psize = gspca_dev->pkt_size; 776 npkt = gspca_dev->cam.npkt; 777 if (npkt == 0) 778 npkt = 32; /* default value */ 779 bsize = psize * npkt; 780 PDEBUG(D_STREAM, 781 "isoc %d pkts size %d = bsize:%d", 782 npkt, psize, bsize); 783 nurbs = DEF_NURBS; 784 } else { /* bulk */ 785 npkt = 0; 786 bsize = gspca_dev->cam.bulk_size; 787 if (bsize == 0) 788 bsize = psize; 789 PDEBUG(D_STREAM, "bulk bsize:%d", bsize); 790 if (gspca_dev->cam.bulk_nurbs != 0) 791 nurbs = gspca_dev->cam.bulk_nurbs; 792 else 793 nurbs = 1; 794 } 795 796 for (n = 0; n < nurbs; n++) { 797 urb = usb_alloc_urb(npkt, GFP_KERNEL); 798 if (!urb) 799 return -ENOMEM; 800 gspca_dev->urb[n] = urb; 801 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev, 802 bsize, 803 GFP_KERNEL, 804 &urb->transfer_dma); 805 806 if (urb->transfer_buffer == NULL) { 807 pr_err("usb_alloc_coherent failed\n"); 808 return -ENOMEM; 809 } 810 urb->dev = gspca_dev->dev; 811 urb->context = gspca_dev; 812 urb->transfer_buffer_length = bsize; 813 if (npkt != 0) { /* ISOC */ 814 urb->pipe = usb_rcvisocpipe(gspca_dev->dev, 815 ep->desc.bEndpointAddress); 816 urb->transfer_flags = URB_ISO_ASAP 817 | URB_NO_TRANSFER_DMA_MAP; 818 urb->interval = 1 << (ep->desc.bInterval - 1); 819 urb->complete = isoc_irq; 820 urb->number_of_packets = npkt; 821 for (i = 0; i < npkt; i++) { 822 urb->iso_frame_desc[i].length = psize; 823 urb->iso_frame_desc[i].offset = psize * i; 824 } 825 } else { /* bulk */ 826 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev, 827 ep->desc.bEndpointAddress); 828 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; 829 urb->complete = bulk_irq; 830 } 831 } 832 return 0; 833 } 834 835 /* 836 * start the USB transfer 837 */ 838 static int gspca_init_transfer(struct gspca_dev *gspca_dev) 839 { 840 struct usb_interface *intf; 841 struct usb_host_endpoint *ep; 842 struct urb *urb; 843 struct ep_tb_s ep_tb[MAX_ALT]; 844 int n, ret, xfer, alt, alt_idx; 845 846 /* reset the streaming variables */ 847 gspca_dev->image = NULL; 848 gspca_dev->image_len = 0; 849 gspca_dev->last_packet_type = DISCARD_PACKET; 850 gspca_dev->sequence = 0; 851 852 gspca_dev->usb_err = 0; 853 854 /* do the specific subdriver stuff before endpoint selection */ 855 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface); 856 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0; 857 if (gspca_dev->sd_desc->isoc_init) { 858 ret = gspca_dev->sd_desc->isoc_init(gspca_dev); 859 if (ret < 0) 860 return ret; 861 } 862 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK 863 : USB_ENDPOINT_XFER_ISOC; 864 865 /* if bulk or the subdriver forced an altsetting, get the endpoint */ 866 if (gspca_dev->alt != 0) { 867 gspca_dev->alt--; /* (previous version compatibility) */ 868 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer, 869 gspca_dev->xfer_ep); 870 if (ep == NULL) { 871 pr_err("bad altsetting %d\n", gspca_dev->alt); 872 return -EIO; 873 } 874 ep_tb[0].alt = gspca_dev->alt; 875 alt_idx = 1; 876 } else { 877 /* else, compute the minimum bandwidth 878 * and build the endpoint table */ 879 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb); 880 if (alt_idx <= 0) { 881 pr_err("no transfer endpoint found\n"); 882 return -EIO; 883 } 884 } 885 886 /* set the highest alternate setting and 887 * loop until urb submit succeeds */ 888 gspca_input_destroy_urb(gspca_dev); 889 890 gspca_dev->alt = ep_tb[--alt_idx].alt; 891 alt = -1; 892 for (;;) { 893 if (alt != gspca_dev->alt) { 894 alt = gspca_dev->alt; 895 if (intf->num_altsetting > 1) { 896 ret = usb_set_interface(gspca_dev->dev, 897 gspca_dev->iface, 898 alt); 899 if (ret < 0) { 900 if (ret == -ENOSPC) 901 goto retry; /*fixme: ugly*/ 902 pr_err("set alt %d err %d\n", alt, ret); 903 goto out; 904 } 905 } 906 } 907 if (!gspca_dev->cam.no_urb_create) { 908 PDEBUG(D_STREAM, "init transfer alt %d", alt); 909 ret = create_urbs(gspca_dev, 910 alt_xfer(&intf->altsetting[alt], xfer, 911 gspca_dev->xfer_ep)); 912 if (ret < 0) { 913 destroy_urbs(gspca_dev); 914 goto out; 915 } 916 } 917 918 /* clear the bulk endpoint */ 919 if (gspca_dev->cam.bulk) 920 usb_clear_halt(gspca_dev->dev, 921 gspca_dev->urb[0]->pipe); 922 923 /* start the cam */ 924 ret = gspca_dev->sd_desc->start(gspca_dev); 925 if (ret < 0) { 926 destroy_urbs(gspca_dev); 927 goto out; 928 } 929 gspca_dev->streaming = 1; 930 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler); 931 932 /* some bulk transfers are started by the subdriver */ 933 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0) 934 break; 935 936 /* submit the URBs */ 937 for (n = 0; n < MAX_NURBS; n++) { 938 urb = gspca_dev->urb[n]; 939 if (urb == NULL) 940 break; 941 ret = usb_submit_urb(urb, GFP_KERNEL); 942 if (ret < 0) 943 break; 944 } 945 if (ret >= 0) 946 break; /* transfer is started */ 947 948 /* something when wrong 949 * stop the webcam and free the transfer resources */ 950 gspca_stream_off(gspca_dev); 951 if (ret != -ENOSPC) { 952 pr_err("usb_submit_urb alt %d err %d\n", 953 gspca_dev->alt, ret); 954 goto out; 955 } 956 957 /* the bandwidth is not wide enough 958 * negotiate or try a lower alternate setting */ 959 retry: 960 PERR("alt %d - bandwidth not wide enough, trying again", alt); 961 msleep(20); /* wait for kill complete */ 962 if (gspca_dev->sd_desc->isoc_nego) { 963 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev); 964 if (ret < 0) 965 goto out; 966 } else { 967 if (alt_idx <= 0) { 968 pr_err("no transfer endpoint found\n"); 969 ret = -EIO; 970 goto out; 971 } 972 gspca_dev->alt = ep_tb[--alt_idx].alt; 973 } 974 } 975 out: 976 gspca_input_create_urb(gspca_dev); 977 return ret; 978 } 979 980 static void gspca_set_default_mode(struct gspca_dev *gspca_dev) 981 { 982 int i; 983 984 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */ 985 gspca_dev->curr_mode = i; 986 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i]; 987 988 /* does nothing if ctrl_handler == NULL */ 989 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler); 990 } 991 992 static int wxh_to_mode(struct gspca_dev *gspca_dev, 993 int width, int height) 994 { 995 int i; 996 997 for (i = 0; i < gspca_dev->cam.nmodes; i++) { 998 if (width == gspca_dev->cam.cam_mode[i].width 999 && height == gspca_dev->cam.cam_mode[i].height) 1000 return i; 1001 } 1002 return -EINVAL; 1003 } 1004 1005 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev, 1006 int width, int height) 1007 { 1008 int i; 1009 1010 for (i = gspca_dev->cam.nmodes; --i > 0; ) { 1011 if (width >= gspca_dev->cam.cam_mode[i].width 1012 && height >= gspca_dev->cam.cam_mode[i].height) 1013 break; 1014 } 1015 return i; 1016 } 1017 1018 /* 1019 * search a mode with the right pixel format 1020 */ 1021 static int gspca_get_mode(struct gspca_dev *gspca_dev, 1022 int mode, 1023 int pixfmt) 1024 { 1025 int modeU, modeD; 1026 1027 modeU = modeD = mode; 1028 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) { 1029 if (--modeD >= 0) { 1030 if (gspca_dev->cam.cam_mode[modeD].pixelformat 1031 == pixfmt) 1032 return modeD; 1033 } 1034 if (++modeU < gspca_dev->cam.nmodes) { 1035 if (gspca_dev->cam.cam_mode[modeU].pixelformat 1036 == pixfmt) 1037 return modeU; 1038 } 1039 } 1040 return -EINVAL; 1041 } 1042 1043 #ifdef CONFIG_VIDEO_ADV_DEBUG 1044 static int vidioc_g_chip_info(struct file *file, void *priv, 1045 struct v4l2_dbg_chip_info *chip) 1046 { 1047 struct gspca_dev *gspca_dev = video_drvdata(file); 1048 1049 gspca_dev->usb_err = 0; 1050 if (gspca_dev->sd_desc->get_chip_info) 1051 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip); 1052 return chip->match.addr ? -EINVAL : 0; 1053 } 1054 1055 static int vidioc_g_register(struct file *file, void *priv, 1056 struct v4l2_dbg_register *reg) 1057 { 1058 struct gspca_dev *gspca_dev = video_drvdata(file); 1059 1060 gspca_dev->usb_err = 0; 1061 return gspca_dev->sd_desc->get_register(gspca_dev, reg); 1062 } 1063 1064 static int vidioc_s_register(struct file *file, void *priv, 1065 const struct v4l2_dbg_register *reg) 1066 { 1067 struct gspca_dev *gspca_dev = video_drvdata(file); 1068 1069 gspca_dev->usb_err = 0; 1070 return gspca_dev->sd_desc->set_register(gspca_dev, reg); 1071 } 1072 #endif 1073 1074 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 1075 struct v4l2_fmtdesc *fmtdesc) 1076 { 1077 struct gspca_dev *gspca_dev = video_drvdata(file); 1078 int i, j, index; 1079 __u32 fmt_tb[8]; 1080 1081 /* give an index to each format */ 1082 index = 0; 1083 j = 0; 1084 for (i = gspca_dev->cam.nmodes; --i >= 0; ) { 1085 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat; 1086 j = 0; 1087 for (;;) { 1088 if (fmt_tb[j] == fmt_tb[index]) 1089 break; 1090 j++; 1091 } 1092 if (j == index) { 1093 if (fmtdesc->index == index) 1094 break; /* new format */ 1095 index++; 1096 if (index >= ARRAY_SIZE(fmt_tb)) 1097 return -EINVAL; 1098 } 1099 } 1100 if (i < 0) 1101 return -EINVAL; /* no more format */ 1102 1103 fmtdesc->pixelformat = fmt_tb[index]; 1104 if (gspca_dev->cam.cam_mode[i].sizeimage < 1105 gspca_dev->cam.cam_mode[i].width * 1106 gspca_dev->cam.cam_mode[i].height) 1107 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED; 1108 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff; 1109 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff; 1110 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff; 1111 fmtdesc->description[3] = fmtdesc->pixelformat >> 24; 1112 fmtdesc->description[4] = '\0'; 1113 return 0; 1114 } 1115 1116 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 1117 struct v4l2_format *fmt) 1118 { 1119 struct gspca_dev *gspca_dev = video_drvdata(file); 1120 1121 fmt->fmt.pix = gspca_dev->pixfmt; 1122 /* some drivers use priv internally, zero it before giving it back to 1123 the core */ 1124 fmt->fmt.pix.priv = 0; 1125 return 0; 1126 } 1127 1128 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev, 1129 struct v4l2_format *fmt) 1130 { 1131 int w, h, mode, mode2; 1132 1133 w = fmt->fmt.pix.width; 1134 h = fmt->fmt.pix.height; 1135 1136 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap", 1137 fmt->fmt.pix.pixelformat, w, h); 1138 1139 /* search the nearest mode for width and height */ 1140 mode = wxh_to_nearest_mode(gspca_dev, w, h); 1141 1142 /* OK if right palette */ 1143 if (gspca_dev->cam.cam_mode[mode].pixelformat 1144 != fmt->fmt.pix.pixelformat) { 1145 1146 /* else, search the closest mode with the same pixel format */ 1147 mode2 = gspca_get_mode(gspca_dev, mode, 1148 fmt->fmt.pix.pixelformat); 1149 if (mode2 >= 0) 1150 mode = mode2; 1151 } 1152 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode]; 1153 if (gspca_dev->sd_desc->try_fmt) { 1154 /* pass original resolution to subdriver try_fmt */ 1155 fmt->fmt.pix.width = w; 1156 fmt->fmt.pix.height = h; 1157 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt); 1158 } 1159 /* some drivers use priv internally, zero it before giving it back to 1160 the core */ 1161 fmt->fmt.pix.priv = 0; 1162 return mode; /* used when s_fmt */ 1163 } 1164 1165 static int vidioc_try_fmt_vid_cap(struct file *file, 1166 void *priv, 1167 struct v4l2_format *fmt) 1168 { 1169 struct gspca_dev *gspca_dev = video_drvdata(file); 1170 int ret; 1171 1172 ret = try_fmt_vid_cap(gspca_dev, fmt); 1173 if (ret < 0) 1174 return ret; 1175 return 0; 1176 } 1177 1178 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 1179 struct v4l2_format *fmt) 1180 { 1181 struct gspca_dev *gspca_dev = video_drvdata(file); 1182 int ret; 1183 1184 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1185 return -ERESTARTSYS; 1186 1187 ret = try_fmt_vid_cap(gspca_dev, fmt); 1188 if (ret < 0) 1189 goto out; 1190 1191 if (gspca_dev->nframes != 0 1192 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) { 1193 ret = -EINVAL; 1194 goto out; 1195 } 1196 1197 if (gspca_dev->streaming) { 1198 ret = -EBUSY; 1199 goto out; 1200 } 1201 gspca_dev->curr_mode = ret; 1202 if (gspca_dev->sd_desc->try_fmt) 1203 /* subdriver try_fmt can modify format parameters */ 1204 gspca_dev->pixfmt = fmt->fmt.pix; 1205 else 1206 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret]; 1207 1208 ret = 0; 1209 out: 1210 mutex_unlock(&gspca_dev->queue_lock); 1211 return ret; 1212 } 1213 1214 static int vidioc_enum_framesizes(struct file *file, void *priv, 1215 struct v4l2_frmsizeenum *fsize) 1216 { 1217 struct gspca_dev *gspca_dev = video_drvdata(file); 1218 int i; 1219 __u32 index = 0; 1220 1221 if (gspca_dev->sd_desc->enum_framesizes) 1222 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize); 1223 1224 for (i = 0; i < gspca_dev->cam.nmodes; i++) { 1225 if (fsize->pixel_format != 1226 gspca_dev->cam.cam_mode[i].pixelformat) 1227 continue; 1228 1229 if (fsize->index == index) { 1230 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 1231 fsize->discrete.width = 1232 gspca_dev->cam.cam_mode[i].width; 1233 fsize->discrete.height = 1234 gspca_dev->cam.cam_mode[i].height; 1235 return 0; 1236 } 1237 index++; 1238 } 1239 1240 return -EINVAL; 1241 } 1242 1243 static int vidioc_enum_frameintervals(struct file *filp, void *priv, 1244 struct v4l2_frmivalenum *fival) 1245 { 1246 struct gspca_dev *gspca_dev = video_drvdata(filp); 1247 int mode; 1248 __u32 i; 1249 1250 mode = wxh_to_mode(gspca_dev, fival->width, fival->height); 1251 if (mode < 0) 1252 return -EINVAL; 1253 1254 if (gspca_dev->cam.mode_framerates == NULL || 1255 gspca_dev->cam.mode_framerates[mode].nrates == 0) 1256 return -EINVAL; 1257 1258 if (fival->pixel_format != 1259 gspca_dev->cam.cam_mode[mode].pixelformat) 1260 return -EINVAL; 1261 1262 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) { 1263 if (fival->index == i) { 1264 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE; 1265 fival->discrete.numerator = 1; 1266 fival->discrete.denominator = 1267 gspca_dev->cam.mode_framerates[mode].rates[i]; 1268 return 0; 1269 } 1270 } 1271 1272 return -EINVAL; 1273 } 1274 1275 static void gspca_release(struct v4l2_device *v4l2_device) 1276 { 1277 struct gspca_dev *gspca_dev = 1278 container_of(v4l2_device, struct gspca_dev, v4l2_dev); 1279 1280 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); 1281 v4l2_device_unregister(&gspca_dev->v4l2_dev); 1282 kfree(gspca_dev->usb_buf); 1283 kfree(gspca_dev); 1284 } 1285 1286 static int dev_open(struct file *file) 1287 { 1288 struct gspca_dev *gspca_dev = video_drvdata(file); 1289 int ret; 1290 1291 PDEBUG(D_STREAM, "[%s] open", current->comm); 1292 1293 /* protect the subdriver against rmmod */ 1294 if (!try_module_get(gspca_dev->module)) 1295 return -ENODEV; 1296 1297 ret = v4l2_fh_open(file); 1298 if (ret) 1299 module_put(gspca_dev->module); 1300 return ret; 1301 } 1302 1303 static int dev_close(struct file *file) 1304 { 1305 struct gspca_dev *gspca_dev = video_drvdata(file); 1306 1307 PDEBUG(D_STREAM, "[%s] close", current->comm); 1308 1309 /* Needed for gspca_stream_off, always lock before queue_lock! */ 1310 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) 1311 return -ERESTARTSYS; 1312 1313 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) { 1314 mutex_unlock(&gspca_dev->usb_lock); 1315 return -ERESTARTSYS; 1316 } 1317 1318 /* if the file did the capture, free the streaming resources */ 1319 if (gspca_dev->capt_file == file) { 1320 if (gspca_dev->streaming) 1321 gspca_stream_off(gspca_dev); 1322 frame_free(gspca_dev); 1323 } 1324 module_put(gspca_dev->module); 1325 mutex_unlock(&gspca_dev->queue_lock); 1326 mutex_unlock(&gspca_dev->usb_lock); 1327 1328 PDEBUG(D_STREAM, "close done"); 1329 1330 return v4l2_fh_release(file); 1331 } 1332 1333 static int vidioc_querycap(struct file *file, void *priv, 1334 struct v4l2_capability *cap) 1335 { 1336 struct gspca_dev *gspca_dev = video_drvdata(file); 1337 1338 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name, 1339 sizeof cap->driver); 1340 if (gspca_dev->dev->product != NULL) { 1341 strlcpy((char *) cap->card, gspca_dev->dev->product, 1342 sizeof cap->card); 1343 } else { 1344 snprintf((char *) cap->card, sizeof cap->card, 1345 "USB Camera (%04x:%04x)", 1346 le16_to_cpu(gspca_dev->dev->descriptor.idVendor), 1347 le16_to_cpu(gspca_dev->dev->descriptor.idProduct)); 1348 } 1349 usb_make_path(gspca_dev->dev, (char *) cap->bus_info, 1350 sizeof(cap->bus_info)); 1351 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE 1352 | V4L2_CAP_STREAMING 1353 | V4L2_CAP_READWRITE; 1354 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 1355 return 0; 1356 } 1357 1358 static int vidioc_enum_input(struct file *file, void *priv, 1359 struct v4l2_input *input) 1360 { 1361 struct gspca_dev *gspca_dev = video_drvdata(file); 1362 1363 if (input->index != 0) 1364 return -EINVAL; 1365 input->type = V4L2_INPUT_TYPE_CAMERA; 1366 input->status = gspca_dev->cam.input_flags; 1367 strlcpy(input->name, gspca_dev->sd_desc->name, 1368 sizeof input->name); 1369 return 0; 1370 } 1371 1372 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 1373 { 1374 *i = 0; 1375 return 0; 1376 } 1377 1378 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 1379 { 1380 if (i > 0) 1381 return -EINVAL; 1382 return (0); 1383 } 1384 1385 static int vidioc_reqbufs(struct file *file, void *priv, 1386 struct v4l2_requestbuffers *rb) 1387 { 1388 struct gspca_dev *gspca_dev = video_drvdata(file); 1389 int i, ret = 0, streaming; 1390 1391 i = rb->memory; /* (avoid compilation warning) */ 1392 switch (i) { 1393 case GSPCA_MEMORY_READ: /* (internal call) */ 1394 case V4L2_MEMORY_MMAP: 1395 case V4L2_MEMORY_USERPTR: 1396 break; 1397 default: 1398 return -EINVAL; 1399 } 1400 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1401 return -ERESTARTSYS; 1402 1403 if (gspca_dev->memory != GSPCA_MEMORY_NO 1404 && gspca_dev->memory != GSPCA_MEMORY_READ 1405 && gspca_dev->memory != rb->memory) { 1406 ret = -EBUSY; 1407 goto out; 1408 } 1409 1410 /* only one file may do the capture */ 1411 if (gspca_dev->capt_file != NULL 1412 && gspca_dev->capt_file != file) { 1413 ret = -EBUSY; 1414 goto out; 1415 } 1416 1417 /* if allocated, the buffers must not be mapped */ 1418 for (i = 0; i < gspca_dev->nframes; i++) { 1419 if (gspca_dev->frame[i].vma_use_count) { 1420 ret = -EBUSY; 1421 goto out; 1422 } 1423 } 1424 1425 /* stop streaming */ 1426 streaming = gspca_dev->streaming; 1427 if (streaming) { 1428 gspca_stream_off(gspca_dev); 1429 1430 /* Don't restart the stream when switching from read 1431 * to mmap mode */ 1432 if (gspca_dev->memory == GSPCA_MEMORY_READ) 1433 streaming = 0; 1434 } 1435 1436 /* free the previous allocated buffers, if any */ 1437 if (gspca_dev->nframes != 0) 1438 frame_free(gspca_dev); 1439 if (rb->count == 0) /* unrequest */ 1440 goto out; 1441 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count); 1442 if (ret == 0) { 1443 rb->count = gspca_dev->nframes; 1444 if (streaming) 1445 ret = gspca_init_transfer(gspca_dev); 1446 } 1447 out: 1448 mutex_unlock(&gspca_dev->queue_lock); 1449 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count); 1450 return ret; 1451 } 1452 1453 static int vidioc_querybuf(struct file *file, void *priv, 1454 struct v4l2_buffer *v4l2_buf) 1455 { 1456 struct gspca_dev *gspca_dev = video_drvdata(file); 1457 struct gspca_frame *frame; 1458 1459 if (v4l2_buf->index >= gspca_dev->nframes) 1460 return -EINVAL; 1461 1462 frame = &gspca_dev->frame[v4l2_buf->index]; 1463 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); 1464 return 0; 1465 } 1466 1467 static int vidioc_streamon(struct file *file, void *priv, 1468 enum v4l2_buf_type buf_type) 1469 { 1470 struct gspca_dev *gspca_dev = video_drvdata(file); 1471 int ret; 1472 1473 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 1474 return -EINVAL; 1475 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1476 return -ERESTARTSYS; 1477 1478 /* check the capture file */ 1479 if (gspca_dev->capt_file != file) { 1480 ret = -EBUSY; 1481 goto out; 1482 } 1483 1484 if (gspca_dev->nframes == 0 1485 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) { 1486 ret = -EINVAL; 1487 goto out; 1488 } 1489 if (!gspca_dev->streaming) { 1490 ret = gspca_init_transfer(gspca_dev); 1491 if (ret < 0) 1492 goto out; 1493 } 1494 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK", 1495 gspca_dev->pixfmt.pixelformat, 1496 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height); 1497 ret = 0; 1498 out: 1499 mutex_unlock(&gspca_dev->queue_lock); 1500 return ret; 1501 } 1502 1503 static int vidioc_streamoff(struct file *file, void *priv, 1504 enum v4l2_buf_type buf_type) 1505 { 1506 struct gspca_dev *gspca_dev = video_drvdata(file); 1507 int i, ret; 1508 1509 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 1510 return -EINVAL; 1511 1512 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1513 return -ERESTARTSYS; 1514 1515 if (!gspca_dev->streaming) { 1516 ret = 0; 1517 goto out; 1518 } 1519 1520 /* check the capture file */ 1521 if (gspca_dev->capt_file != file) { 1522 ret = -EBUSY; 1523 goto out; 1524 } 1525 1526 /* stop streaming */ 1527 gspca_stream_off(gspca_dev); 1528 /* In case another thread is waiting in dqbuf */ 1529 wake_up_interruptible(&gspca_dev->wq); 1530 1531 /* empty the transfer queues */ 1532 for (i = 0; i < gspca_dev->nframes; i++) 1533 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS; 1534 atomic_set(&gspca_dev->fr_q, 0); 1535 atomic_set(&gspca_dev->fr_i, 0); 1536 gspca_dev->fr_o = 0; 1537 ret = 0; 1538 out: 1539 mutex_unlock(&gspca_dev->queue_lock); 1540 return ret; 1541 } 1542 1543 static int vidioc_g_jpegcomp(struct file *file, void *priv, 1544 struct v4l2_jpegcompression *jpegcomp) 1545 { 1546 struct gspca_dev *gspca_dev = video_drvdata(file); 1547 1548 gspca_dev->usb_err = 0; 1549 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp); 1550 } 1551 1552 static int vidioc_s_jpegcomp(struct file *file, void *priv, 1553 const struct v4l2_jpegcompression *jpegcomp) 1554 { 1555 struct gspca_dev *gspca_dev = video_drvdata(file); 1556 1557 gspca_dev->usb_err = 0; 1558 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp); 1559 } 1560 1561 static int vidioc_g_parm(struct file *filp, void *priv, 1562 struct v4l2_streamparm *parm) 1563 { 1564 struct gspca_dev *gspca_dev = video_drvdata(filp); 1565 1566 parm->parm.capture.readbuffers = gspca_dev->nbufread; 1567 1568 if (gspca_dev->sd_desc->get_streamparm) { 1569 gspca_dev->usb_err = 0; 1570 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm); 1571 return gspca_dev->usb_err; 1572 } 1573 return 0; 1574 } 1575 1576 static int vidioc_s_parm(struct file *filp, void *priv, 1577 struct v4l2_streamparm *parm) 1578 { 1579 struct gspca_dev *gspca_dev = video_drvdata(filp); 1580 unsigned int n; 1581 1582 n = parm->parm.capture.readbuffers; 1583 if (n == 0 || n >= GSPCA_MAX_FRAMES) 1584 parm->parm.capture.readbuffers = gspca_dev->nbufread; 1585 else 1586 gspca_dev->nbufread = n; 1587 1588 if (gspca_dev->sd_desc->set_streamparm) { 1589 gspca_dev->usb_err = 0; 1590 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm); 1591 return gspca_dev->usb_err; 1592 } 1593 1594 return 0; 1595 } 1596 1597 static int dev_mmap(struct file *file, struct vm_area_struct *vma) 1598 { 1599 struct gspca_dev *gspca_dev = video_drvdata(file); 1600 struct gspca_frame *frame; 1601 struct page *page; 1602 unsigned long addr, start, size; 1603 int i, ret; 1604 1605 start = vma->vm_start; 1606 size = vma->vm_end - vma->vm_start; 1607 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size); 1608 1609 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1610 return -ERESTARTSYS; 1611 if (gspca_dev->capt_file != file) { 1612 ret = -EINVAL; 1613 goto out; 1614 } 1615 1616 frame = NULL; 1617 for (i = 0; i < gspca_dev->nframes; ++i) { 1618 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) { 1619 PDEBUG(D_STREAM, "mmap bad memory type"); 1620 break; 1621 } 1622 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT) 1623 == vma->vm_pgoff) { 1624 frame = &gspca_dev->frame[i]; 1625 break; 1626 } 1627 } 1628 if (frame == NULL) { 1629 PDEBUG(D_STREAM, "mmap no frame buffer found"); 1630 ret = -EINVAL; 1631 goto out; 1632 } 1633 if (size != frame->v4l2_buf.length) { 1634 PDEBUG(D_STREAM, "mmap bad size"); 1635 ret = -EINVAL; 1636 goto out; 1637 } 1638 1639 /* 1640 * - VM_IO marks the area as being a mmaped region for I/O to a 1641 * device. It also prevents the region from being core dumped. 1642 */ 1643 vma->vm_flags |= VM_IO; 1644 1645 addr = (unsigned long) frame->data; 1646 while (size > 0) { 1647 page = vmalloc_to_page((void *) addr); 1648 ret = vm_insert_page(vma, start, page); 1649 if (ret < 0) 1650 goto out; 1651 start += PAGE_SIZE; 1652 addr += PAGE_SIZE; 1653 size -= PAGE_SIZE; 1654 } 1655 1656 vma->vm_ops = &gspca_vm_ops; 1657 vma->vm_private_data = frame; 1658 gspca_vm_open(vma); 1659 ret = 0; 1660 out: 1661 mutex_unlock(&gspca_dev->queue_lock); 1662 return ret; 1663 } 1664 1665 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file, 1666 enum v4l2_memory memory) 1667 { 1668 if (!gspca_dev->present) 1669 return -ENODEV; 1670 if (gspca_dev->capt_file != file || gspca_dev->memory != memory || 1671 !gspca_dev->streaming) 1672 return -EINVAL; 1673 1674 /* check if a frame is ready */ 1675 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i); 1676 } 1677 1678 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file, 1679 enum v4l2_memory memory) 1680 { 1681 int ret; 1682 1683 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1684 return -ERESTARTSYS; 1685 ret = frame_ready_nolock(gspca_dev, file, memory); 1686 mutex_unlock(&gspca_dev->queue_lock); 1687 return ret; 1688 } 1689 1690 /* 1691 * dequeue a video buffer 1692 * 1693 * If nonblock_ing is false, block until a buffer is available. 1694 */ 1695 static int vidioc_dqbuf(struct file *file, void *priv, 1696 struct v4l2_buffer *v4l2_buf) 1697 { 1698 struct gspca_dev *gspca_dev = video_drvdata(file); 1699 struct gspca_frame *frame; 1700 int i, j, ret; 1701 1702 PDEBUG(D_FRAM, "dqbuf"); 1703 1704 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1705 return -ERESTARTSYS; 1706 1707 for (;;) { 1708 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory); 1709 if (ret < 0) 1710 goto out; 1711 if (ret > 0) 1712 break; 1713 1714 mutex_unlock(&gspca_dev->queue_lock); 1715 1716 if (file->f_flags & O_NONBLOCK) 1717 return -EAGAIN; 1718 1719 /* wait till a frame is ready */ 1720 ret = wait_event_interruptible_timeout(gspca_dev->wq, 1721 frame_ready(gspca_dev, file, v4l2_buf->memory), 1722 msecs_to_jiffies(3000)); 1723 if (ret < 0) 1724 return ret; 1725 if (ret == 0) 1726 return -EIO; 1727 1728 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1729 return -ERESTARTSYS; 1730 } 1731 1732 i = gspca_dev->fr_o; 1733 j = gspca_dev->fr_queue[i]; 1734 frame = &gspca_dev->frame[j]; 1735 1736 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES; 1737 1738 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; 1739 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); 1740 PDEBUG(D_FRAM, "dqbuf %d", j); 1741 ret = 0; 1742 1743 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) { 1744 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr, 1745 frame->data, 1746 frame->v4l2_buf.bytesused)) { 1747 PERR("dqbuf cp to user failed"); 1748 ret = -EFAULT; 1749 } 1750 } 1751 out: 1752 mutex_unlock(&gspca_dev->queue_lock); 1753 1754 if (ret == 0 && gspca_dev->sd_desc->dq_callback) { 1755 mutex_lock(&gspca_dev->usb_lock); 1756 gspca_dev->usb_err = 0; 1757 if (gspca_dev->present) 1758 gspca_dev->sd_desc->dq_callback(gspca_dev); 1759 mutex_unlock(&gspca_dev->usb_lock); 1760 } 1761 1762 return ret; 1763 } 1764 1765 /* 1766 * queue a video buffer 1767 * 1768 * Attempting to queue a buffer that has already been 1769 * queued will return -EINVAL. 1770 */ 1771 static int vidioc_qbuf(struct file *file, void *priv, 1772 struct v4l2_buffer *v4l2_buf) 1773 { 1774 struct gspca_dev *gspca_dev = video_drvdata(file); 1775 struct gspca_frame *frame; 1776 int i, index, ret; 1777 1778 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index); 1779 1780 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) 1781 return -ERESTARTSYS; 1782 1783 index = v4l2_buf->index; 1784 if ((unsigned) index >= gspca_dev->nframes) { 1785 PDEBUG(D_FRAM, 1786 "qbuf idx %d >= %d", index, gspca_dev->nframes); 1787 ret = -EINVAL; 1788 goto out; 1789 } 1790 if (v4l2_buf->memory != gspca_dev->memory) { 1791 PDEBUG(D_FRAM, "qbuf bad memory type"); 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 1796 frame = &gspca_dev->frame[index]; 1797 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) { 1798 PDEBUG(D_FRAM, "qbuf bad state"); 1799 ret = -EINVAL; 1800 goto out; 1801 } 1802 1803 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED; 1804 1805 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) { 1806 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr; 1807 frame->v4l2_buf.length = v4l2_buf->length; 1808 } 1809 1810 /* put the buffer in the 'queued' queue */ 1811 i = atomic_read(&gspca_dev->fr_q); 1812 gspca_dev->fr_queue[i] = index; 1813 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES); 1814 1815 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED; 1816 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE; 1817 ret = 0; 1818 out: 1819 mutex_unlock(&gspca_dev->queue_lock); 1820 return ret; 1821 } 1822 1823 /* 1824 * allocate the resources for read() 1825 */ 1826 static int read_alloc(struct gspca_dev *gspca_dev, 1827 struct file *file) 1828 { 1829 struct v4l2_buffer v4l2_buf; 1830 int i, ret; 1831 1832 PDEBUG(D_STREAM, "read alloc"); 1833 1834 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) 1835 return -ERESTARTSYS; 1836 1837 if (gspca_dev->nframes == 0) { 1838 struct v4l2_requestbuffers rb; 1839 1840 memset(&rb, 0, sizeof rb); 1841 rb.count = gspca_dev->nbufread; 1842 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1843 rb.memory = GSPCA_MEMORY_READ; 1844 ret = vidioc_reqbufs(file, gspca_dev, &rb); 1845 if (ret != 0) { 1846 PDEBUG(D_STREAM, "read reqbuf err %d", ret); 1847 goto out; 1848 } 1849 memset(&v4l2_buf, 0, sizeof v4l2_buf); 1850 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1851 v4l2_buf.memory = GSPCA_MEMORY_READ; 1852 for (i = 0; i < gspca_dev->nbufread; i++) { 1853 v4l2_buf.index = i; 1854 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf); 1855 if (ret != 0) { 1856 PDEBUG(D_STREAM, "read qbuf err: %d", ret); 1857 goto out; 1858 } 1859 } 1860 } 1861 1862 /* start streaming */ 1863 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE); 1864 if (ret != 0) 1865 PDEBUG(D_STREAM, "read streamon err %d", ret); 1866 out: 1867 mutex_unlock(&gspca_dev->usb_lock); 1868 return ret; 1869 } 1870 1871 static unsigned int dev_poll(struct file *file, poll_table *wait) 1872 { 1873 struct gspca_dev *gspca_dev = video_drvdata(file); 1874 unsigned long req_events = poll_requested_events(wait); 1875 int ret = 0; 1876 1877 PDEBUG(D_FRAM, "poll"); 1878 1879 if (req_events & POLLPRI) 1880 ret |= v4l2_ctrl_poll(file, wait); 1881 1882 if (req_events & (POLLIN | POLLRDNORM)) { 1883 /* if reqbufs is not done, the user would use read() */ 1884 if (gspca_dev->memory == GSPCA_MEMORY_NO) { 1885 if (read_alloc(gspca_dev, file) != 0) { 1886 ret |= POLLERR; 1887 goto out; 1888 } 1889 } 1890 1891 poll_wait(file, &gspca_dev->wq, wait); 1892 1893 /* check if an image has been received */ 1894 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) { 1895 ret |= POLLERR; 1896 goto out; 1897 } 1898 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i)) 1899 ret |= POLLIN | POLLRDNORM; 1900 mutex_unlock(&gspca_dev->queue_lock); 1901 } 1902 1903 out: 1904 if (!gspca_dev->present) 1905 ret |= POLLHUP; 1906 1907 return ret; 1908 } 1909 1910 static ssize_t dev_read(struct file *file, char __user *data, 1911 size_t count, loff_t *ppos) 1912 { 1913 struct gspca_dev *gspca_dev = video_drvdata(file); 1914 struct gspca_frame *frame; 1915 struct v4l2_buffer v4l2_buf; 1916 struct timeval timestamp; 1917 int n, ret, ret2; 1918 1919 PDEBUG(D_FRAM, "read (%zd)", count); 1920 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */ 1921 ret = read_alloc(gspca_dev, file); 1922 if (ret != 0) 1923 return ret; 1924 } 1925 1926 /* get a frame */ 1927 v4l2_get_timestamp(×tamp); 1928 timestamp.tv_sec--; 1929 n = 2; 1930 for (;;) { 1931 memset(&v4l2_buf, 0, sizeof v4l2_buf); 1932 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 1933 v4l2_buf.memory = GSPCA_MEMORY_READ; 1934 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf); 1935 if (ret != 0) { 1936 PDEBUG(D_STREAM, "read dqbuf err %d", ret); 1937 return ret; 1938 } 1939 1940 /* if the process slept for more than 1 second, 1941 * get a newer frame */ 1942 frame = &gspca_dev->frame[v4l2_buf.index]; 1943 if (--n < 0) 1944 break; /* avoid infinite loop */ 1945 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec) 1946 break; 1947 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf); 1948 if (ret != 0) { 1949 PDEBUG(D_STREAM, "read qbuf err %d", ret); 1950 return ret; 1951 } 1952 } 1953 1954 /* copy the frame */ 1955 if (count > frame->v4l2_buf.bytesused) 1956 count = frame->v4l2_buf.bytesused; 1957 ret = copy_to_user(data, frame->data, count); 1958 if (ret != 0) { 1959 PERR("read cp to user lack %d / %zd", ret, count); 1960 ret = -EFAULT; 1961 goto out; 1962 } 1963 ret = count; 1964 out: 1965 /* in each case, requeue the buffer */ 1966 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf); 1967 if (ret2 != 0) 1968 return ret2; 1969 return ret; 1970 } 1971 1972 static struct v4l2_file_operations dev_fops = { 1973 .owner = THIS_MODULE, 1974 .open = dev_open, 1975 .release = dev_close, 1976 .read = dev_read, 1977 .mmap = dev_mmap, 1978 .unlocked_ioctl = video_ioctl2, 1979 .poll = dev_poll, 1980 }; 1981 1982 static const struct v4l2_ioctl_ops dev_ioctl_ops = { 1983 .vidioc_querycap = vidioc_querycap, 1984 .vidioc_dqbuf = vidioc_dqbuf, 1985 .vidioc_qbuf = vidioc_qbuf, 1986 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 1987 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 1988 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 1989 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 1990 .vidioc_streamon = vidioc_streamon, 1991 .vidioc_enum_input = vidioc_enum_input, 1992 .vidioc_g_input = vidioc_g_input, 1993 .vidioc_s_input = vidioc_s_input, 1994 .vidioc_reqbufs = vidioc_reqbufs, 1995 .vidioc_querybuf = vidioc_querybuf, 1996 .vidioc_streamoff = vidioc_streamoff, 1997 .vidioc_g_jpegcomp = vidioc_g_jpegcomp, 1998 .vidioc_s_jpegcomp = vidioc_s_jpegcomp, 1999 .vidioc_g_parm = vidioc_g_parm, 2000 .vidioc_s_parm = vidioc_s_parm, 2001 .vidioc_enum_framesizes = vidioc_enum_framesizes, 2002 .vidioc_enum_frameintervals = vidioc_enum_frameintervals, 2003 #ifdef CONFIG_VIDEO_ADV_DEBUG 2004 .vidioc_g_chip_info = vidioc_g_chip_info, 2005 .vidioc_g_register = vidioc_g_register, 2006 .vidioc_s_register = vidioc_s_register, 2007 #endif 2008 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 2009 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 2010 }; 2011 2012 static const struct video_device gspca_template = { 2013 .name = "gspca main driver", 2014 .fops = &dev_fops, 2015 .ioctl_ops = &dev_ioctl_ops, 2016 .release = video_device_release_empty, /* We use v4l2_dev.release */ 2017 }; 2018 2019 /* 2020 * probe and create a new gspca device 2021 * 2022 * This function must be called by the sub-driver when it is 2023 * called for probing a new device. 2024 */ 2025 int gspca_dev_probe2(struct usb_interface *intf, 2026 const struct usb_device_id *id, 2027 const struct sd_desc *sd_desc, 2028 int dev_size, 2029 struct module *module) 2030 { 2031 struct gspca_dev *gspca_dev; 2032 struct usb_device *dev = interface_to_usbdev(intf); 2033 int ret; 2034 2035 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n", 2036 sd_desc->name, id->idVendor, id->idProduct); 2037 2038 /* create the device */ 2039 if (dev_size < sizeof *gspca_dev) 2040 dev_size = sizeof *gspca_dev; 2041 gspca_dev = kzalloc(dev_size, GFP_KERNEL); 2042 if (!gspca_dev) { 2043 pr_err("couldn't kzalloc gspca struct\n"); 2044 return -ENOMEM; 2045 } 2046 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL); 2047 if (!gspca_dev->usb_buf) { 2048 pr_err("out of memory\n"); 2049 ret = -ENOMEM; 2050 goto out; 2051 } 2052 gspca_dev->dev = dev; 2053 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber; 2054 gspca_dev->xfer_ep = -1; 2055 2056 /* check if any audio device */ 2057 if (dev->actconfig->desc.bNumInterfaces != 1) { 2058 int i; 2059 struct usb_interface *intf2; 2060 2061 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 2062 intf2 = dev->actconfig->interface[i]; 2063 if (intf2 != NULL 2064 && intf2->altsetting != NULL 2065 && intf2->altsetting->desc.bInterfaceClass == 2066 USB_CLASS_AUDIO) { 2067 gspca_dev->audio = 1; 2068 break; 2069 } 2070 } 2071 } 2072 2073 gspca_dev->v4l2_dev.release = gspca_release; 2074 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev); 2075 if (ret) 2076 goto out; 2077 gspca_dev->sd_desc = sd_desc; 2078 gspca_dev->nbufread = 2; 2079 gspca_dev->empty_packet = -1; /* don't check the empty packets */ 2080 gspca_dev->vdev = gspca_template; 2081 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev; 2082 video_set_drvdata(&gspca_dev->vdev, gspca_dev); 2083 gspca_dev->module = module; 2084 gspca_dev->present = 1; 2085 2086 mutex_init(&gspca_dev->usb_lock); 2087 gspca_dev->vdev.lock = &gspca_dev->usb_lock; 2088 mutex_init(&gspca_dev->queue_lock); 2089 init_waitqueue_head(&gspca_dev->wq); 2090 2091 /* configure the subdriver and initialize the USB device */ 2092 ret = sd_desc->config(gspca_dev, id); 2093 if (ret < 0) 2094 goto out; 2095 ret = sd_desc->init(gspca_dev); 2096 if (ret < 0) 2097 goto out; 2098 if (sd_desc->init_controls) 2099 ret = sd_desc->init_controls(gspca_dev); 2100 if (ret < 0) 2101 goto out; 2102 gspca_set_default_mode(gspca_dev); 2103 2104 ret = gspca_input_connect(gspca_dev); 2105 if (ret) 2106 goto out; 2107 2108 /* 2109 * Don't take usb_lock for these ioctls. This improves latency if 2110 * usb_lock is taken for a long time, e.g. when changing a control 2111 * value, and a new frame is ready to be dequeued. 2112 */ 2113 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF); 2114 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF); 2115 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF); 2116 #ifdef CONFIG_VIDEO_ADV_DEBUG 2117 if (!gspca_dev->sd_desc->get_register) 2118 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER); 2119 if (!gspca_dev->sd_desc->set_register) 2120 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER); 2121 #endif 2122 if (!gspca_dev->sd_desc->get_jcomp) 2123 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP); 2124 if (!gspca_dev->sd_desc->set_jcomp) 2125 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP); 2126 2127 /* init video stuff */ 2128 ret = video_register_device(&gspca_dev->vdev, 2129 VFL_TYPE_GRABBER, 2130 -1); 2131 if (ret < 0) { 2132 pr_err("video_register_device err %d\n", ret); 2133 goto out; 2134 } 2135 2136 usb_set_intfdata(intf, gspca_dev); 2137 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev)); 2138 2139 gspca_input_create_urb(gspca_dev); 2140 2141 return 0; 2142 out: 2143 #if IS_ENABLED(CONFIG_INPUT) 2144 if (gspca_dev->input_dev) 2145 input_unregister_device(gspca_dev->input_dev); 2146 #endif 2147 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); 2148 kfree(gspca_dev->usb_buf); 2149 kfree(gspca_dev); 2150 return ret; 2151 } 2152 EXPORT_SYMBOL(gspca_dev_probe2); 2153 2154 /* same function as the previous one, but check the interface */ 2155 int gspca_dev_probe(struct usb_interface *intf, 2156 const struct usb_device_id *id, 2157 const struct sd_desc *sd_desc, 2158 int dev_size, 2159 struct module *module) 2160 { 2161 struct usb_device *dev = interface_to_usbdev(intf); 2162 2163 /* we don't handle multi-config cameras */ 2164 if (dev->descriptor.bNumConfigurations != 1) { 2165 pr_err("%04x:%04x too many config\n", 2166 id->idVendor, id->idProduct); 2167 return -ENODEV; 2168 } 2169 2170 /* the USB video interface must be the first one */ 2171 if (dev->actconfig->desc.bNumInterfaces != 1 2172 && intf->cur_altsetting->desc.bInterfaceNumber != 0) 2173 return -ENODEV; 2174 2175 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module); 2176 } 2177 EXPORT_SYMBOL(gspca_dev_probe); 2178 2179 /* 2180 * USB disconnection 2181 * 2182 * This function must be called by the sub-driver 2183 * when the device disconnects, after the specific resources are freed. 2184 */ 2185 void gspca_disconnect(struct usb_interface *intf) 2186 { 2187 struct gspca_dev *gspca_dev = usb_get_intfdata(intf); 2188 #if IS_ENABLED(CONFIG_INPUT) 2189 struct input_dev *input_dev; 2190 #endif 2191 2192 PDEBUG(D_PROBE, "%s disconnect", 2193 video_device_node_name(&gspca_dev->vdev)); 2194 2195 mutex_lock(&gspca_dev->usb_lock); 2196 2197 gspca_dev->present = 0; 2198 destroy_urbs(gspca_dev); 2199 2200 #if IS_ENABLED(CONFIG_INPUT) 2201 gspca_input_destroy_urb(gspca_dev); 2202 input_dev = gspca_dev->input_dev; 2203 if (input_dev) { 2204 gspca_dev->input_dev = NULL; 2205 input_unregister_device(input_dev); 2206 } 2207 #endif 2208 /* Free subdriver's streaming resources / stop sd workqueue(s) */ 2209 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming) 2210 gspca_dev->sd_desc->stop0(gspca_dev); 2211 gspca_dev->streaming = 0; 2212 gspca_dev->dev = NULL; 2213 wake_up_interruptible(&gspca_dev->wq); 2214 2215 v4l2_device_disconnect(&gspca_dev->v4l2_dev); 2216 video_unregister_device(&gspca_dev->vdev); 2217 2218 mutex_unlock(&gspca_dev->usb_lock); 2219 2220 /* (this will call gspca_release() immediately or on last close) */ 2221 v4l2_device_put(&gspca_dev->v4l2_dev); 2222 } 2223 EXPORT_SYMBOL(gspca_disconnect); 2224 2225 #ifdef CONFIG_PM 2226 int gspca_suspend(struct usb_interface *intf, pm_message_t message) 2227 { 2228 struct gspca_dev *gspca_dev = usb_get_intfdata(intf); 2229 2230 gspca_input_destroy_urb(gspca_dev); 2231 2232 if (!gspca_dev->streaming) 2233 return 0; 2234 2235 mutex_lock(&gspca_dev->usb_lock); 2236 gspca_dev->frozen = 1; /* avoid urb error messages */ 2237 gspca_dev->usb_err = 0; 2238 if (gspca_dev->sd_desc->stopN) 2239 gspca_dev->sd_desc->stopN(gspca_dev); 2240 destroy_urbs(gspca_dev); 2241 gspca_set_alt0(gspca_dev); 2242 if (gspca_dev->sd_desc->stop0) 2243 gspca_dev->sd_desc->stop0(gspca_dev); 2244 mutex_unlock(&gspca_dev->usb_lock); 2245 2246 return 0; 2247 } 2248 EXPORT_SYMBOL(gspca_suspend); 2249 2250 int gspca_resume(struct usb_interface *intf) 2251 { 2252 struct gspca_dev *gspca_dev = usb_get_intfdata(intf); 2253 int streaming, ret = 0; 2254 2255 mutex_lock(&gspca_dev->usb_lock); 2256 gspca_dev->frozen = 0; 2257 gspca_dev->usb_err = 0; 2258 gspca_dev->sd_desc->init(gspca_dev); 2259 /* 2260 * Most subdrivers send all ctrl values on sd_start and thus 2261 * only write to the device registers on s_ctrl when streaming -> 2262 * Clear streaming to avoid setting all ctrls twice. 2263 */ 2264 streaming = gspca_dev->streaming; 2265 gspca_dev->streaming = 0; 2266 if (streaming) 2267 ret = gspca_init_transfer(gspca_dev); 2268 else 2269 gspca_input_create_urb(gspca_dev); 2270 mutex_unlock(&gspca_dev->usb_lock); 2271 2272 return ret; 2273 } 2274 EXPORT_SYMBOL(gspca_resume); 2275 #endif 2276 2277 /* -- module insert / remove -- */ 2278 static int __init gspca_init(void) 2279 { 2280 pr_info("v" GSPCA_VERSION " registered\n"); 2281 return 0; 2282 } 2283 static void __exit gspca_exit(void) 2284 { 2285 } 2286 2287 module_init(gspca_init); 2288 module_exit(gspca_exit); 2289 2290 module_param_named(debug, gspca_debug, int, 0644); 2291 MODULE_PARM_DESC(debug, 2292 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo"); 2293