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