drivers/media/usb/gspca/gspca.c

   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
  20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #define GSPCA_VERSION   "2.14.0"
  23
  24 #include <linux/init.h>
  25 #include <linux/fs.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/string.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/io.h>
  33 #include <asm/page.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/ktime.h>
  36 #include <media/v4l2-ioctl.h>
  37 #include <media/v4l2-ctrls.h>
  38 #include <media/v4l2-fh.h>
  39 #include <media/v4l2-event.h>
  40
  41 #include "gspca.h"
  42
  43 #if IS_ENABLED(CONFIG_INPUT)
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57 MODULE_VERSION(GSPCA_VERSION);
  58
  59 int gspca_debug;
  60 EXPORT_SYMBOL(gspca_debug);
  61
  62 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
  63                         __u32 pixfmt, int w, int h)
  64 {
  65         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  66                 gspca_dbg(gspca_dev, debug, "%s %c%c%c%c %dx%d\n",
  67                           txt,
  68                           pixfmt & 0xff,
  69                           (pixfmt >> 8) & 0xff,
  70                           (pixfmt >> 16) & 0xff,
  71                           pixfmt >> 24,
  72                           w, h);
  73         } else {
  74                 gspca_dbg(gspca_dev, debug, "%s 0x%08x %dx%d\n",
  75                           txt,
  76                           pixfmt,
  77                           w, h);
  78         }
  79 }
  80
  81 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  82 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  83 #define GSPCA_MEMORY_READ 7
  84
  85 /*
  86  * Input and interrupt endpoint handling functions
  87  */
  88 #if IS_ENABLED(CONFIG_INPUT)
  89 static void int_irq(struct urb *urb)
  90 {
  91         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
  92         int ret;
  93
  94         ret = urb->status;
  95         switch (ret) {
  96         case 0:
  97                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
  98                     urb->transfer_buffer, urb->actual_length) < 0) {
  99                         gspca_err(gspca_dev, "Unknown packet received\n");
 100                 }
 101                 break;
 102
 103         case -ENOENT:
 104         case -ECONNRESET:
 105         case -ENODEV:
 106         case -ESHUTDOWN:
 107                 /* Stop is requested either by software or hardware is gone,
 108                  * keep the ret value non-zero and don't resubmit later.
 109                  */
 110                 break;
 111
 112         default:
 113                 gspca_err(gspca_dev, "URB error %i, resubmitting\n",
 114                           urb->status);
 115                 urb->status = 0;
 116                 ret = 0;
 117         }
 118
 119         if (ret == 0) {
 120                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 121                 if (ret < 0)
 122                         pr_err("Resubmit URB failed with error %i\n", ret);
 123         }
 124 }
 125
 126 static int gspca_input_connect(struct gspca_dev *dev)
 127 {
 128         struct input_dev *input_dev;
 129         int err = 0;
 130
 131         dev->input_dev = NULL;
 132         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 133                 input_dev = input_allocate_device();
 134                 if (!input_dev)
 135                         return -ENOMEM;
 136
 137                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 138                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 139
 140                 input_dev->name = dev->sd_desc->name;
 141                 input_dev->phys = dev->phys;
 142
 143                 usb_to_input_id(dev->dev, &input_dev->id);
 144
 145                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 146                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 147                 input_dev->dev.parent = &dev->dev->dev;
 148
 149                 err = input_register_device(input_dev);
 150                 if (err) {
 151                         pr_err("Input device registration failed with error %i\n",
 152                                err);
 153                         input_dev->dev.parent = NULL;
 154                         input_free_device(input_dev);
 155                 } else {
 156                         dev->input_dev = input_dev;
 157                 }
 158         }
 159
 160         return err;
 161 }
 162
 163 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 164                           struct usb_endpoint_descriptor *ep)
 165 {
 166         unsigned int buffer_len;
 167         int interval;
 168         struct urb *urb;
 169         struct usb_device *dev;
 170         void *buffer = NULL;
 171         int ret = -EINVAL;
 172
 173         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 174         interval = ep->bInterval;
 175         gspca_dbg(gspca_dev, D_CONF, "found int in endpoint: 0x%x, buffer_len=%u, interval=%u\n",
 176                   ep->bEndpointAddress, buffer_len, interval);
 177
 178         dev = gspca_dev->dev;
 179
 180         urb = usb_alloc_urb(0, GFP_KERNEL);
 181         if (!urb) {
 182                 ret = -ENOMEM;
 183                 goto error;
 184         }
 185
 186         buffer = usb_alloc_coherent(dev, buffer_len,
 187                                 GFP_KERNEL, &urb->transfer_dma);
 188         if (!buffer) {
 189                 ret = -ENOMEM;
 190                 goto error_buffer;
 191         }
 192         usb_fill_int_urb(urb, dev,
 193                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 194                 buffer, buffer_len,
 195                 int_irq, (void *)gspca_dev, interval);
 196         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 197         ret = usb_submit_urb(urb, GFP_KERNEL);
 198         if (ret < 0) {
 199                 gspca_err(gspca_dev, "submit int URB failed with error %i\n",
 200                           ret);
 201                 goto error_submit;
 202         }
 203         gspca_dev->int_urb = urb;
 204         return ret;
 205
 206 error_submit:
 207         usb_free_coherent(dev,
 208                           urb->transfer_buffer_length,
 209                           urb->transfer_buffer,
 210                           urb->transfer_dma);
 211 error_buffer:
 212         usb_free_urb(urb);
 213 error:
 214         return ret;
 215 }
 216
 217 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 218 {
 219         struct usb_interface *intf;
 220         struct usb_host_interface *intf_desc;
 221         struct usb_endpoint_descriptor *ep;
 222         int i;
 223
 224         if (gspca_dev->sd_desc->int_pkt_scan)  {
 225                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 226                 intf_desc = intf->cur_altsetting;
 227                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 228                         ep = &intf_desc->endpoint[i].desc;
 229                         if (usb_endpoint_dir_in(ep) &&
 230                             usb_endpoint_xfer_int(ep)) {
 231
 232                                 alloc_and_submit_int_urb(gspca_dev, ep);
 233                                 break;
 234                         }
 235                 }
 236         }
 237 }
 238
 239 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 240 {
 241         struct urb *urb;
 242
 243         urb = gspca_dev->int_urb;
 244         if (urb) {
 245                 gspca_dev->int_urb = NULL;
 246                 usb_kill_urb(urb);
 247                 usb_free_coherent(gspca_dev->dev,
 248                                   urb->transfer_buffer_length,
 249                                   urb->transfer_buffer,
 250                                   urb->transfer_dma);
 251                 usb_free_urb(urb);
 252         }
 253 }
 254 #else
 255 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 256 {
 257 }
 258
 259 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 260 {
 261 }
 262
 263 static inline int gspca_input_connect(struct gspca_dev *dev)
 264 {
 265         return 0;
 266 }
 267 #endif
 268
 269 /*
 270  * fill a video frame from an URB and resubmit
 271  */
 272 static void fill_frame(struct gspca_dev *gspca_dev,
 273                         struct urb *urb)
 274 {
 275         u8 *data;               /* address of data in the iso message */
 276         int i, len, st;
 277         cam_pkt_op pkt_scan;
 278
 279         if (urb->status != 0) {
 280                 if (urb->status == -ESHUTDOWN)
 281                         return;         /* disconnection */
 282 #ifdef CONFIG_PM
 283                 if (gspca_dev->frozen)
 284                         return;
 285 #endif
 286                 gspca_err(gspca_dev, "urb status: %d\n", urb->status);
 287                 urb->status = 0;
 288                 goto resubmit;
 289         }
 290         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 291         for (i = 0; i < urb->number_of_packets; i++) {
 292                 len = urb->iso_frame_desc[i].actual_length;
 293
 294                 /* check the packet status and length */
 295                 st = urb->iso_frame_desc[i].status;
 296                 if (st) {
 297                         gspca_dbg(gspca_dev, D_PACK, "ISOC data error: [%d] len=%d, status=%d\n",
 298                                i, len, st);
 299                         gspca_dev->last_packet_type = DISCARD_PACKET;
 300                         continue;
 301                 }
 302                 if (len == 0) {
 303                         if (gspca_dev->empty_packet == 0)
 304                                 gspca_dev->empty_packet = 1;
 305                         continue;
 306                 }
 307
 308                 /* let the packet be analyzed by the subdriver */
 309                 gspca_dbg(gspca_dev, D_PACK, "packet [%d] o:%d l:%d\n",
 310                           i, urb->iso_frame_desc[i].offset, len);
 311                 data = (u8 *) urb->transfer_buffer
 312                                         + urb->iso_frame_desc[i].offset;
 313                 pkt_scan(gspca_dev, data, len);
 314         }
 315
 316 resubmit:
 317         if (!gspca_dev->streaming)
 318                 return;
 319         /* resubmit the URB */
 320         st = usb_submit_urb(urb, GFP_ATOMIC);
 321         if (st < 0)
 322                 pr_err("usb_submit_urb() ret %d\n", st);
 323 }
 324
 325 /*
 326  * ISOC message interrupt from the USB device
 327  *
 328  * Analyse each packet and call the subdriver for copy to the frame buffer.
 329  */
 330 static void isoc_irq(struct urb *urb)
 331 {
 332         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 333
 334         gspca_dbg(gspca_dev, D_PACK, "isoc irq\n");
 335         if (!gspca_dev->streaming)
 336                 return;
 337         fill_frame(gspca_dev, urb);
 338 }
 339
 340 /*
 341  * bulk message interrupt from the USB device
 342  */
 343 static void bulk_irq(struct urb *urb)
 344 {
 345         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 346         int st;
 347
 348         gspca_dbg(gspca_dev, D_PACK, "bulk irq\n");
 349         if (!gspca_dev->streaming)
 350                 return;
 351         switch (urb->status) {
 352         case 0:
 353                 break;
 354         case -ESHUTDOWN:
 355                 return;         /* disconnection */
 356         default:
 357 #ifdef CONFIG_PM
 358                 if (gspca_dev->frozen)
 359                         return;
 360 #endif
 361                 gspca_err(gspca_dev, "urb status: %d\n", urb->status);
 362                 urb->status = 0;
 363                 goto resubmit;
 364         }
 365
 366         gspca_dbg(gspca_dev, D_PACK, "packet l:%d\n", urb->actual_length);
 367         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 368                                 urb->transfer_buffer,
 369                                 urb->actual_length);
 370
 371 resubmit:
 372         if (!gspca_dev->streaming)
 373                 return;
 374         /* resubmit the URB */
 375         if (gspca_dev->cam.bulk_nurbs != 0) {
 376                 st = usb_submit_urb(urb, GFP_ATOMIC);
 377                 if (st < 0)
 378                         pr_err("usb_submit_urb() ret %d\n", st);
 379         }
 380 }
 381
 382 /*
 383  * add data to the current frame
 384  *
 385  * This function is called by the subdrivers at interrupt level.
 386  *
 387  * To build a frame, these ones must add
 388  *      - one FIRST_PACKET
 389  *      - 0 or many INTER_PACKETs
 390  *      - one LAST_PACKET
 391  * DISCARD_PACKET invalidates the whole frame.
 392  */
 393 void gspca_frame_add(struct gspca_dev *gspca_dev,
 394                         enum gspca_packet_type packet_type,
 395                         const u8 *data,
 396                         int len)
 397 {
 398         struct gspca_buffer *buf;
 399         unsigned long flags;
 400
 401         gspca_dbg(gspca_dev, D_PACK, "add t:%d l:%d\n", packet_type, len);
 402
 403         spin_lock_irqsave(&gspca_dev->qlock, flags);
 404         buf = list_first_entry_or_null(&gspca_dev->buf_list,
 405                                        typeof(*buf), list);
 406         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
 407
 408         if (packet_type == FIRST_PACKET) {
 409                 /* if there is no queued buffer, discard the whole frame */
 410                 if (!buf) {
 411                         gspca_dev->last_packet_type = DISCARD_PACKET;
 412                         gspca_dev->sequence++;
 413                         return;
 414                 }
 415                 gspca_dev->image = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 416                 gspca_dev->image_len = 0;
 417         } else {
 418                 switch (gspca_dev->last_packet_type) {
 419                 case DISCARD_PACKET:
 420                         if (packet_type == LAST_PACKET) {
 421                                 gspca_dev->last_packet_type = packet_type;
 422                                 gspca_dev->image = NULL;
 423                                 gspca_dev->image_len = 0;
 424                         }
 425                         return;
 426                 case LAST_PACKET:
 427                         return;
 428                 }
 429         }
 430
 431         /* append the packet to the frame buffer */
 432         if (len > 0) {
 433                 if (gspca_dev->image_len + len > PAGE_ALIGN(gspca_dev->pixfmt.sizeimage)) {
 434                         gspca_err(gspca_dev, "frame overflow %d > %d\n",
 435                                   gspca_dev->image_len + len,
 436                                   PAGE_ALIGN(gspca_dev->pixfmt.sizeimage));
 437                         packet_type = DISCARD_PACKET;
 438                 } else {
 439 /* !! image is NULL only when last pkt is LAST or DISCARD
 440                         if (gspca_dev->image == NULL) {
 441                                 pr_err("gspca_frame_add() image == NULL\n");
 442                                 return;
 443                         }
 444  */
 445                         memcpy(gspca_dev->image + gspca_dev->image_len,
 446                                 data, len);
 447                         gspca_dev->image_len += len;
 448                 }
 449         }
 450         gspca_dev->last_packet_type = packet_type;
 451
 452         /* if last packet, invalidate packet concatenation until
 453          * next first packet, wake up the application and advance
 454          * in the queue */
 455         if (packet_type == LAST_PACKET) {
 456                 spin_lock_irqsave(&gspca_dev->qlock, flags);
 457                 list_del(&buf->list);
 458                 spin_unlock_irqrestore(&gspca_dev->qlock, flags);
 459                 buf->vb.vb2_buf.timestamp = ktime_get_ns();
 460                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0,
 461                                       gspca_dev->image_len);
 462                 buf->vb.sequence = gspca_dev->sequence++;
 463                 buf->vb.field = V4L2_FIELD_NONE;
 464                 gspca_dbg(gspca_dev, D_FRAM, "frame complete len:%d\n",
 465                           gspca_dev->image_len);
 466                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 467                 gspca_dev->image = NULL;
 468                 gspca_dev->image_len = 0;
 469         }
 470 }
 471 EXPORT_SYMBOL(gspca_frame_add);
 472
 473 static void destroy_urbs(struct gspca_dev *gspca_dev)
 474 {
 475         struct urb *urb;
 476         unsigned int i;
 477
 478         gspca_dbg(gspca_dev, D_STREAM, "kill transfer\n");
 479
 480         /* Killing all URBs guarantee that no URB completion
 481          * handler is running. Therefore, there shouldn't
 482          * be anyone trying to access gspca_dev->urb[i]
 483          */
 484         for (i = 0; i < MAX_NURBS; i++)
 485                 usb_kill_urb(gspca_dev->urb[i]);
 486
 487         gspca_dbg(gspca_dev, D_STREAM, "releasing urbs\n");
 488         for (i = 0; i < MAX_NURBS; i++) {
 489                 urb = gspca_dev->urb[i];
 490                 if (!urb)
 491                         continue;
 492                 gspca_dev->urb[i] = NULL;
 493                 usb_free_coherent(gspca_dev->dev,
 494                                   urb->transfer_buffer_length,
 495                                   urb->transfer_buffer,
 496                                   urb->transfer_dma);
 497                 usb_free_urb(urb);
 498         }
 499 }
 500
 501 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 502 {
 503         int ret;
 504
 505         if (gspca_dev->alt == 0)
 506                 return 0;
 507         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 508         if (ret < 0)
 509                 pr_err("set alt 0 err %d\n", ret);
 510         return ret;
 511 }
 512
 513 /*
 514  * look for an input transfer endpoint in an alternate setting.
 515  *
 516  * If xfer_ep is invalid, return the first valid ep found, otherwise
 517  * look for exactly the ep with address equal to xfer_ep.
 518  */
 519 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 520                                           int xfer, int xfer_ep)
 521 {
 522         struct usb_host_endpoint *ep;
 523         int i, attr;
 524
 525         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 526                 ep = &alt->endpoint[i];
 527                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 528                 if (attr == xfer
 529                     && ep->desc.wMaxPacketSize != 0
 530                     && usb_endpoint_dir_in(&ep->desc)
 531                     && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
 532                         return ep;
 533         }
 534         return NULL;
 535 }
 536
 537 /* compute the minimum bandwidth for the current transfer */
 538 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 539 {
 540         u32 bandwidth;
 541
 542         /* get the (max) image size */
 543         bandwidth = gspca_dev->pixfmt.sizeimage;
 544
 545         /* if the image is compressed, estimate its mean size */
 546         if (!gspca_dev->cam.needs_full_bandwidth &&
 547             bandwidth < gspca_dev->pixfmt.width *
 548                                 gspca_dev->pixfmt.height)
 549                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 550
 551         /* estimate the frame rate */
 552         if (gspca_dev->sd_desc->get_streamparm) {
 553                 struct v4l2_streamparm parm;
 554
 555                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 556                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 557                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 558         } else {
 559
 560                 /* don't hope more than 15 fps with USB 1.1 and
 561                  * image resolution >= 640x480 */
 562                 if (gspca_dev->pixfmt.width >= 640
 563                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 564                         bandwidth *= 15;                /* 15 fps */
 565                 else
 566                         bandwidth *= 30;                /* 30 fps */
 567         }
 568
 569         gspca_dbg(gspca_dev, D_STREAM, "min bandwidth: %d\n", bandwidth);
 570         return bandwidth;
 571 }
 572
 573 /* endpoint table */
 574 #define MAX_ALT 16
 575 struct ep_tb_s {
 576         u32 alt;
 577         u32 bandwidth;
 578 };
 579
 580 /*
 581  * build the table of the endpoints
 582  * and compute the minimum bandwidth for the image transfer
 583  */
 584 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 585                         struct usb_interface *intf,
 586                         struct ep_tb_s *ep_tb)
 587 {
 588         struct usb_host_endpoint *ep;
 589         int i, j, nbalt, psize, found;
 590         u32 bandwidth, last_bw;
 591
 592         nbalt = intf->num_altsetting;
 593         if (nbalt > MAX_ALT)
 594                 nbalt = MAX_ALT;        /* fixme: should warn */
 595
 596         /* build the endpoint table */
 597         i = 0;
 598         last_bw = 0;
 599         for (;;) {
 600                 ep_tb->bandwidth = 2000 * 2000 * 120;
 601                 found = 0;
 602                 for (j = 0; j < nbalt; j++) {
 603                         ep = alt_xfer(&intf->altsetting[j],
 604                                       USB_ENDPOINT_XFER_ISOC,
 605                                       gspca_dev->xfer_ep);
 606                         if (ep == NULL)
 607                                 continue;
 608                         if (ep->desc.bInterval == 0) {
 609                                 pr_err("alt %d iso endp with 0 interval\n", j);
 610                                 continue;
 611                         }
 612                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 613                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 614                         bandwidth = psize * 1000;
 615                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 616                          || gspca_dev->dev->speed >= USB_SPEED_SUPER)
 617                                 bandwidth *= 8;
 618                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 619                         if (bandwidth <= last_bw)
 620                                 continue;
 621                         if (bandwidth < ep_tb->bandwidth) {
 622                                 ep_tb->bandwidth = bandwidth;
 623                                 ep_tb->alt = j;
 624                                 found = 1;
 625                         }
 626                 }
 627                 if (!found)
 628                         break;
 629                 gspca_dbg(gspca_dev, D_STREAM, "alt %d bandwidth %d\n",
 630                           ep_tb->alt, ep_tb->bandwidth);
 631                 last_bw = ep_tb->bandwidth;
 632                 i++;
 633                 ep_tb++;
 634         }
 635
 636         /*
 637          * If the camera:
 638          * has a usb audio class interface (a built in usb mic); and
 639          * is a usb 1 full speed device; and
 640          * uses the max full speed iso bandwidth; and
 641          * and has more than 1 alt setting
 642          * then skip the highest alt setting to spare bandwidth for the mic
 643          */
 644         if (gspca_dev->audio &&
 645                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 646                         last_bw >= 1000000 &&
 647                         i > 1) {
 648                 gspca_dbg(gspca_dev, D_STREAM, "dev has usb audio, skipping highest alt\n");
 649                 i--;
 650                 ep_tb--;
 651         }
 652
 653         /* get the requested bandwidth and start at the highest atlsetting */
 654         bandwidth = which_bandwidth(gspca_dev);
 655         ep_tb--;
 656         while (i > 1) {
 657                 ep_tb--;
 658                 if (ep_tb->bandwidth < bandwidth)
 659                         break;
 660                 i--;
 661         }
 662         return i;
 663 }
 664
 665 /*
 666  * create the URBs for image transfer
 667  */
 668 static int create_urbs(struct gspca_dev *gspca_dev,
 669                         struct usb_host_endpoint *ep)
 670 {
 671         struct urb *urb;
 672         int n, nurbs, i, psize, npkt, bsize;
 673
 674         /* calculate the packet size and the number of packets */
 675         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 676
 677         if (!gspca_dev->cam.bulk) {             /* isoc */
 678
 679                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 680                 if (gspca_dev->pkt_size == 0)
 681                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 682                 else
 683                         psize = gspca_dev->pkt_size;
 684                 npkt = gspca_dev->cam.npkt;
 685                 if (npkt == 0)
 686                         npkt = 32;              /* default value */
 687                 bsize = psize * npkt;
 688                 gspca_dbg(gspca_dev, D_STREAM,
 689                           "isoc %d pkts size %d = bsize:%d\n",
 690                           npkt, psize, bsize);
 691                 nurbs = DEF_NURBS;
 692         } else {                                /* bulk */
 693                 npkt = 0;
 694                 bsize = gspca_dev->cam.bulk_size;
 695                 if (bsize == 0)
 696                         bsize = psize;
 697                 gspca_dbg(gspca_dev, D_STREAM, "bulk bsize:%d\n", bsize);
 698                 if (gspca_dev->cam.bulk_nurbs != 0)
 699                         nurbs = gspca_dev->cam.bulk_nurbs;
 700                 else
 701                         nurbs = 1;
 702         }
 703
 704         for (n = 0; n < nurbs; n++) {
 705                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 706                 if (!urb)
 707                         return -ENOMEM;
 708                 gspca_dev->urb[n] = urb;
 709                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 710                                                 bsize,
 711                                                 GFP_KERNEL,
 712                                                 &urb->transfer_dma);
 713
 714                 if (urb->transfer_buffer == NULL) {
 715                         pr_err("usb_alloc_coherent failed\n");
 716                         return -ENOMEM;
 717                 }
 718                 urb->dev = gspca_dev->dev;
 719                 urb->context = gspca_dev;
 720                 urb->transfer_buffer_length = bsize;
 721                 if (npkt != 0) {                /* ISOC */
 722                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 723                                                     ep->desc.bEndpointAddress);
 724                         urb->transfer_flags = URB_ISO_ASAP
 725                                         | URB_NO_TRANSFER_DMA_MAP;
 726                         urb->interval = 1 << (ep->desc.bInterval - 1);
 727                         urb->complete = isoc_irq;
 728                         urb->number_of_packets = npkt;
 729                         for (i = 0; i < npkt; i++) {
 730                                 urb->iso_frame_desc[i].length = psize;
 731                                 urb->iso_frame_desc[i].offset = psize * i;
 732                         }
 733                 } else {                /* bulk */
 734                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 735                                                 ep->desc.bEndpointAddress);
 736                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 737                         urb->complete = bulk_irq;
 738                 }
 739         }
 740         return 0;
 741 }
 742
 743 /* Note: both the queue and the usb locks should be held when calling this */
 744 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 745 {
 746         gspca_dev->streaming = false;
 747         gspca_dev->usb_err = 0;
 748         if (gspca_dev->sd_desc->stopN)
 749                 gspca_dev->sd_desc->stopN(gspca_dev);
 750         destroy_urbs(gspca_dev);
 751         gspca_input_destroy_urb(gspca_dev);
 752         gspca_set_alt0(gspca_dev);
 753         if (gspca_dev->present)
 754                 gspca_input_create_urb(gspca_dev);
 755         if (gspca_dev->sd_desc->stop0)
 756                 gspca_dev->sd_desc->stop0(gspca_dev);
 757         gspca_dbg(gspca_dev, D_STREAM, "stream off OK\n");
 758 }
 759
 760 /*
 761  * start the USB transfer
 762  */
 763 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 764 {
 765         struct usb_interface *intf;
 766         struct usb_host_endpoint *ep;
 767         struct urb *urb;
 768         struct ep_tb_s ep_tb[MAX_ALT];
 769         int n, ret, xfer, alt, alt_idx;
 770
 771         /* reset the streaming variables */
 772         gspca_dev->image = NULL;
 773         gspca_dev->image_len = 0;
 774         gspca_dev->last_packet_type = DISCARD_PACKET;
 775
 776         gspca_dev->usb_err = 0;
 777
 778         /* do the specific subdriver stuff before endpoint selection */
 779         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 780         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 781         if (gspca_dev->sd_desc->isoc_init) {
 782                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 783                 if (ret < 0)
 784                         return ret;
 785         }
 786         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 787                                    : USB_ENDPOINT_XFER_ISOC;
 788
 789         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 790         if (gspca_dev->alt != 0) {
 791                 gspca_dev->alt--;       /* (previous version compatibility) */
 792                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
 793                               gspca_dev->xfer_ep);
 794                 if (ep == NULL) {
 795                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 796                         return -EIO;
 797                 }
 798                 ep_tb[0].alt = gspca_dev->alt;
 799                 alt_idx = 1;
 800         } else {
 801                 /* else, compute the minimum bandwidth
 802                  * and build the endpoint table */
 803                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 804                 if (alt_idx <= 0) {
 805                         pr_err("no transfer endpoint found\n");
 806                         return -EIO;
 807                 }
 808         }
 809
 810         /* set the highest alternate setting and
 811          * loop until urb submit succeeds */
 812         gspca_input_destroy_urb(gspca_dev);
 813
 814         gspca_dev->alt = ep_tb[--alt_idx].alt;
 815         alt = -1;
 816         for (;;) {
 817                 if (alt != gspca_dev->alt) {
 818                         alt = gspca_dev->alt;
 819                         if (intf->num_altsetting > 1) {
 820                                 ret = usb_set_interface(gspca_dev->dev,
 821                                                         gspca_dev->iface,
 822                                                         alt);
 823                                 if (ret < 0) {
 824                                         if (ret == -ENOSPC)
 825                                                 goto retry; /*fixme: ugly*/
 826                                         pr_err("set alt %d err %d\n", alt, ret);
 827                                         goto out;
 828                                 }
 829                         }
 830                 }
 831                 if (!gspca_dev->cam.no_urb_create) {
 832                         gspca_dbg(gspca_dev, D_STREAM, "init transfer alt %d\n",
 833                                   alt);
 834                         ret = create_urbs(gspca_dev,
 835                                 alt_xfer(&intf->altsetting[alt], xfer,
 836                                          gspca_dev->xfer_ep));
 837                         if (ret < 0) {
 838                                 destroy_urbs(gspca_dev);
 839                                 goto out;
 840                         }
 841                 }
 842
 843                 /* clear the bulk endpoint */
 844                 if (gspca_dev->cam.bulk)
 845                         usb_clear_halt(gspca_dev->dev,
 846                                         gspca_dev->urb[0]->pipe);
 847
 848                 /* start the cam */
 849                 ret = gspca_dev->sd_desc->start(gspca_dev);
 850                 if (ret < 0) {
 851                         destroy_urbs(gspca_dev);
 852                         goto out;
 853                 }
 854                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 855                 gspca_dev->streaming = true;
 856
 857                 /* some bulk transfers are started by the subdriver */
 858                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 859                         break;
 860
 861                 /* submit the URBs */
 862                 for (n = 0; n < MAX_NURBS; n++) {
 863                         urb = gspca_dev->urb[n];
 864                         if (urb == NULL)
 865                                 break;
 866                         ret = usb_submit_urb(urb, GFP_KERNEL);
 867                         if (ret < 0)
 868                                 break;
 869                 }
 870                 if (ret >= 0)
 871                         break;                  /* transfer is started */
 872
 873                 /* something when wrong
 874                  * stop the webcam and free the transfer resources */
 875                 gspca_stream_off(gspca_dev);
 876                 if (ret != -ENOSPC) {
 877                         pr_err("usb_submit_urb alt %d err %d\n",
 878                                gspca_dev->alt, ret);
 879                         goto out;
 880                 }
 881
 882                 /* the bandwidth is not wide enough
 883                  * negotiate or try a lower alternate setting */
 884 retry:
 885                 gspca_err(gspca_dev, "alt %d - bandwidth not wide enough, trying again\n",
 886                           alt);
 887                 msleep(20);     /* wait for kill complete */
 888                 if (gspca_dev->sd_desc->isoc_nego) {
 889                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 890                         if (ret < 0)
 891                                 goto out;
 892                 } else {
 893                         if (alt_idx <= 0) {
 894                                 pr_err("no transfer endpoint found\n");
 895                                 ret = -EIO;
 896                                 goto out;
 897                         }
 898                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 899                 }
 900         }
 901 out:
 902         gspca_input_create_urb(gspca_dev);
 903         return ret;
 904 }
 905
 906 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 907 {
 908         int i;
 909
 910         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 911         gspca_dev->curr_mode = i;
 912         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
 913
 914         /* does nothing if ctrl_handler == NULL */
 915         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 916 }
 917
 918 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 919                         int width, int height, u32 pixelformat)
 920 {
 921         int i;
 922
 923         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 924                 if (width == gspca_dev->cam.cam_mode[i].width
 925                     && height == gspca_dev->cam.cam_mode[i].height
 926                     && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
 927                         return i;
 928         }
 929         return -EINVAL;
 930 }
 931
 932 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
 933                         int width, int height, u32 pixelformat)
 934 {
 935         int i;
 936
 937         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 938                 if (width >= gspca_dev->cam.cam_mode[i].width
 939                     && height >= gspca_dev->cam.cam_mode[i].height
 940                     && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
 941                         return i;
 942         }
 943         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 944                 if (width >= gspca_dev->cam.cam_mode[i].width
 945                     && height >= gspca_dev->cam.cam_mode[i].height)
 946                         break;
 947         }
 948         return i;
 949 }
 950
 951 /*
 952  * search a mode with the right pixel format
 953  */
 954 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 955                         int mode,
 956                         int pixfmt)
 957 {
 958         int modeU, modeD;
 959
 960         modeU = modeD = mode;
 961         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 962                 if (--modeD >= 0) {
 963                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 964                                                                 == pixfmt)
 965                                 return modeD;
 966                 }
 967                 if (++modeU < gspca_dev->cam.nmodes) {
 968                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 969                                                                 == pixfmt)
 970                                 return modeU;
 971                 }
 972         }
 973         return -EINVAL;
 974 }
 975
 976 #ifdef CONFIG_VIDEO_ADV_DEBUG
 977 static int vidioc_g_chip_info(struct file *file, void *priv,
 978                                 struct v4l2_dbg_chip_info *chip)
 979 {
 980         struct gspca_dev *gspca_dev = video_drvdata(file);
 981
 982         gspca_dev->usb_err = 0;
 983         if (gspca_dev->sd_desc->get_chip_info)
 984                 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
 985         return chip->match.addr ? -EINVAL : 0;
 986 }
 987
 988 static int vidioc_g_register(struct file *file, void *priv,
 989                 struct v4l2_dbg_register *reg)
 990 {
 991         struct gspca_dev *gspca_dev = video_drvdata(file);
 992
 993         gspca_dev->usb_err = 0;
 994         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
 995 }
 996
 997 static int vidioc_s_register(struct file *file, void *priv,
 998                 const struct v4l2_dbg_register *reg)
 999 {
1000         struct gspca_dev *gspca_dev = video_drvdata(file);
1001
1002         gspca_dev->usb_err = 0;
1003         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1004 }
1005 #endif
1006
1007 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1008                                 struct v4l2_fmtdesc *fmtdesc)
1009 {
1010         struct gspca_dev *gspca_dev = video_drvdata(file);
1011         int i, j, index;
1012         __u32 fmt_tb[8];
1013
1014         /* give an index to each format */
1015         index = 0;
1016         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1017                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1018                 j = 0;
1019                 for (;;) {
1020                         if (fmt_tb[j] == fmt_tb[index])
1021                                 break;
1022                         j++;
1023                 }
1024                 if (j == index) {
1025                         if (fmtdesc->index == index)
1026                                 break;          /* new format */
1027                         index++;
1028                         if (index >= ARRAY_SIZE(fmt_tb))
1029                                 return -EINVAL;
1030                 }
1031         }
1032         if (i < 0)
1033                 return -EINVAL;         /* no more format */
1034
1035         fmtdesc->pixelformat = fmt_tb[index];
1036         if (gspca_dev->cam.cam_mode[i].sizeimage <
1037                         gspca_dev->cam.cam_mode[i].width *
1038                                 gspca_dev->cam.cam_mode[i].height)
1039                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1040         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1041         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1042         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1043         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1044         fmtdesc->description[4] = '\0';
1045         return 0;
1046 }
1047
1048 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1049                             struct v4l2_format *fmt)
1050 {
1051         struct gspca_dev *gspca_dev = video_drvdata(file);
1052
1053         fmt->fmt.pix = gspca_dev->pixfmt;
1054         /* some drivers use priv internally, zero it before giving it back to
1055            the core */
1056         fmt->fmt.pix.priv = 0;
1057         return 0;
1058 }
1059
1060 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1061                         struct v4l2_format *fmt)
1062 {
1063         int w, h, mode, mode2;
1064
1065         w = fmt->fmt.pix.width;
1066         h = fmt->fmt.pix.height;
1067
1068         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1069                     fmt->fmt.pix.pixelformat, w, h);
1070
1071         /* search the nearest mode for width and height */
1072         mode = wxh_to_nearest_mode(gspca_dev, w, h, fmt->fmt.pix.pixelformat);
1073
1074         /* OK if right palette */
1075         if (gspca_dev->cam.cam_mode[mode].pixelformat
1076                                                 != fmt->fmt.pix.pixelformat) {
1077
1078                 /* else, search the closest mode with the same pixel format */
1079                 mode2 = gspca_get_mode(gspca_dev, mode,
1080                                         fmt->fmt.pix.pixelformat);
1081                 if (mode2 >= 0)
1082                         mode = mode2;
1083         }
1084         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1085         if (gspca_dev->sd_desc->try_fmt) {
1086                 /* pass original resolution to subdriver try_fmt */
1087                 fmt->fmt.pix.width = w;
1088                 fmt->fmt.pix.height = h;
1089                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1090         }
1091         /* some drivers use priv internally, zero it before giving it back to
1092            the core */
1093         fmt->fmt.pix.priv = 0;
1094         return mode;                    /* used when s_fmt */
1095 }
1096
1097 static int vidioc_try_fmt_vid_cap(struct file *file,
1098                               void *priv,
1099                               struct v4l2_format *fmt)
1100 {
1101         struct gspca_dev *gspca_dev = video_drvdata(file);
1102
1103         if (try_fmt_vid_cap(gspca_dev, fmt) < 0)
1104                 return -EINVAL;
1105         return 0;
1106 }
1107
1108 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1109                             struct v4l2_format *fmt)
1110 {
1111         struct gspca_dev *gspca_dev = video_drvdata(file);
1112         int mode;
1113
1114         if (vb2_is_busy(&gspca_dev->queue))
1115                 return -EBUSY;
1116
1117         mode = try_fmt_vid_cap(gspca_dev, fmt);
1118         if (mode < 0)
1119                 return -EINVAL;
1120
1121         gspca_dev->curr_mode = mode;
1122         if (gspca_dev->sd_desc->try_fmt)
1123                 /* subdriver try_fmt can modify format parameters */
1124                 gspca_dev->pixfmt = fmt->fmt.pix;
1125         else
1126                 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[mode];
1127         return 0;
1128 }
1129
1130 static int vidioc_enum_framesizes(struct file *file, void *priv,
1131                                   struct v4l2_frmsizeenum *fsize)
1132 {
1133         struct gspca_dev *gspca_dev = video_drvdata(file);
1134         int i;
1135         __u32 index = 0;
1136
1137         if (gspca_dev->sd_desc->enum_framesizes)
1138                 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1139
1140         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1141                 if (fsize->pixel_format !=
1142                                 gspca_dev->cam.cam_mode[i].pixelformat)
1143                         continue;
1144
1145                 if (fsize->index == index) {
1146                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1147                         fsize->discrete.width =
1148                                 gspca_dev->cam.cam_mode[i].width;
1149                         fsize->discrete.height =
1150                                 gspca_dev->cam.cam_mode[i].height;
1151                         return 0;
1152                 }
1153                 index++;
1154         }
1155
1156         return -EINVAL;
1157 }
1158
1159 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1160                                       struct v4l2_frmivalenum *fival)
1161 {
1162         struct gspca_dev *gspca_dev = video_drvdata(filp);
1163         int mode;
1164         __u32 i;
1165
1166         mode = wxh_to_mode(gspca_dev, fival->width, fival->height,
1167                            fival->pixel_format);
1168         if (mode < 0)
1169                 return -EINVAL;
1170
1171         if (gspca_dev->cam.mode_framerates == NULL ||
1172                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1173                 return -EINVAL;
1174
1175         if (fival->pixel_format !=
1176                         gspca_dev->cam.cam_mode[mode].pixelformat)
1177                 return -EINVAL;
1178
1179         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1180                 if (fival->index == i) {
1181                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1182                         fival->discrete.numerator = 1;
1183                         fival->discrete.denominator =
1184                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1185                         return 0;
1186                 }
1187         }
1188
1189         return -EINVAL;
1190 }
1191
1192 static void gspca_release(struct v4l2_device *v4l2_device)
1193 {
1194         struct gspca_dev *gspca_dev =
1195                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1196
1197         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1198         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1199         kfree(gspca_dev->usb_buf);
1200         kfree(gspca_dev);
1201 }
1202
1203 static int vidioc_querycap(struct file *file, void  *priv,
1204                            struct v4l2_capability *cap)
1205 {
1206         struct gspca_dev *gspca_dev = video_drvdata(file);
1207
1208         strscpy((char *)cap->driver, gspca_dev->sd_desc->name,
1209                 sizeof(cap->driver));
1210         if (gspca_dev->dev->product != NULL) {
1211                 strscpy((char *)cap->card, gspca_dev->dev->product,
1212                         sizeof(cap->card));
1213         } else {
1214                 snprintf((char *) cap->card, sizeof cap->card,
1215                         "USB Camera (%04x:%04x)",
1216                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1217                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1218         }
1219         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1220                         sizeof(cap->bus_info));
1221         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1222                           | V4L2_CAP_STREAMING
1223                           | V4L2_CAP_READWRITE;
1224         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1225         return 0;
1226 }
1227
1228 static int vidioc_enum_input(struct file *file, void *priv,
1229                                 struct v4l2_input *input)
1230 {
1231         struct gspca_dev *gspca_dev = video_drvdata(file);
1232
1233         if (input->index != 0)
1234                 return -EINVAL;
1235         input->type = V4L2_INPUT_TYPE_CAMERA;
1236         input->status = gspca_dev->cam.input_flags;
1237         strscpy(input->name, gspca_dev->sd_desc->name,
1238                 sizeof input->name);
1239         return 0;
1240 }
1241
1242 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1243 {
1244         *i = 0;
1245         return 0;
1246 }
1247
1248 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1249 {
1250         if (i > 0)
1251                 return -EINVAL;
1252         return 0;
1253 }
1254
1255 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1256                         struct v4l2_jpegcompression *jpegcomp)
1257 {
1258         struct gspca_dev *gspca_dev = video_drvdata(file);
1259
1260         gspca_dev->usb_err = 0;
1261         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1262 }
1263
1264 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1265                         const struct v4l2_jpegcompression *jpegcomp)
1266 {
1267         struct gspca_dev *gspca_dev = video_drvdata(file);
1268
1269         gspca_dev->usb_err = 0;
1270         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1271 }
1272
1273 static int vidioc_g_parm(struct file *filp, void *priv,
1274                         struct v4l2_streamparm *parm)
1275 {
1276         struct gspca_dev *gspca_dev = video_drvdata(filp);
1277
1278         parm->parm.capture.readbuffers = gspca_dev->queue.min_buffers_needed;
1279
1280         if (!gspca_dev->sd_desc->get_streamparm)
1281                 return 0;
1282
1283         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1284         gspca_dev->usb_err = 0;
1285         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1286         return gspca_dev->usb_err;
1287 }
1288
1289 static int vidioc_s_parm(struct file *filp, void *priv,
1290                         struct v4l2_streamparm *parm)
1291 {
1292         struct gspca_dev *gspca_dev = video_drvdata(filp);
1293
1294         parm->parm.capture.readbuffers = gspca_dev->queue.min_buffers_needed;
1295
1296         if (!gspca_dev->sd_desc->set_streamparm) {
1297                 parm->parm.capture.capability = 0;
1298                 return 0;
1299         }
1300
1301         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1302         gspca_dev->usb_err = 0;
1303         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1304         return gspca_dev->usb_err;
1305 }
1306
1307 static int gspca_queue_setup(struct vb2_queue *vq,
1308                              unsigned int *nbuffers, unsigned int *nplanes,
1309                              unsigned int sizes[], struct device *alloc_devs[])
1310 {
1311         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1312         unsigned int size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1313
1314         if (*nplanes)
1315                 return sizes[0] < size ? -EINVAL : 0;
1316         *nplanes = 1;
1317         sizes[0] = size;
1318         return 0;
1319 }
1320
1321 static int gspca_buffer_prepare(struct vb2_buffer *vb)
1322 {
1323         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1324         unsigned long size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1325
1326         if (vb2_plane_size(vb, 0) < size) {
1327                 gspca_err(gspca_dev, "buffer too small (%lu < %lu)\n",
1328                          vb2_plane_size(vb, 0), size);
1329                 return -EINVAL;
1330         }
1331         return 0;
1332 }
1333
1334 static void gspca_buffer_finish(struct vb2_buffer *vb)
1335 {
1336         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1337
1338         if (!gspca_dev->sd_desc->dq_callback)
1339                 return;
1340
1341         gspca_dev->usb_err = 0;
1342         if (gspca_dev->present)
1343                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1344 }
1345
1346 static void gspca_buffer_queue(struct vb2_buffer *vb)
1347 {
1348         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1349         struct gspca_buffer *buf = to_gspca_buffer(vb);
1350         unsigned long flags;
1351
1352         spin_lock_irqsave(&gspca_dev->qlock, flags);
1353         list_add_tail(&buf->list, &gspca_dev->buf_list);
1354         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1355 }
1356
1357 static void gspca_return_all_buffers(struct gspca_dev *gspca_dev,
1358                                      enum vb2_buffer_state state)
1359 {
1360         struct gspca_buffer *buf, *node;
1361         unsigned long flags;
1362
1363         spin_lock_irqsave(&gspca_dev->qlock, flags);
1364         list_for_each_entry_safe(buf, node, &gspca_dev->buf_list, list) {
1365                 vb2_buffer_done(&buf->vb.vb2_buf, state);
1366                 list_del(&buf->list);
1367         }
1368         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1369 }
1370
1371 static int gspca_start_streaming(struct vb2_queue *vq, unsigned int count)
1372 {
1373         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1374         int ret;
1375
1376         gspca_dev->sequence = 0;
1377
1378         ret = gspca_init_transfer(gspca_dev);
1379         if (ret)
1380                 gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_QUEUED);
1381         return ret;
1382 }
1383
1384 static void gspca_stop_streaming(struct vb2_queue *vq)
1385 {
1386         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1387
1388         gspca_stream_off(gspca_dev);
1389
1390         /* Release all active buffers */
1391         gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_ERROR);
1392 }
1393
1394 static const struct vb2_ops gspca_qops = {
1395         .queue_setup            = gspca_queue_setup,
1396         .buf_prepare            = gspca_buffer_prepare,
1397         .buf_finish             = gspca_buffer_finish,
1398         .buf_queue              = gspca_buffer_queue,
1399         .start_streaming        = gspca_start_streaming,
1400         .stop_streaming         = gspca_stop_streaming,
1401         .wait_prepare           = vb2_ops_wait_prepare,
1402         .wait_finish            = vb2_ops_wait_finish,
1403 };
1404
1405 static const struct v4l2_file_operations dev_fops = {
1406         .owner = THIS_MODULE,
1407         .open = v4l2_fh_open,
1408         .release = vb2_fop_release,
1409         .unlocked_ioctl = video_ioctl2,
1410         .read = vb2_fop_read,
1411         .mmap = vb2_fop_mmap,
1412         .poll = vb2_fop_poll,
1413 };
1414
1415 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1416         .vidioc_querycap        = vidioc_querycap,
1417         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1418         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1419         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1420         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1421         .vidioc_enum_input      = vidioc_enum_input,
1422         .vidioc_g_input         = vidioc_g_input,
1423         .vidioc_s_input         = vidioc_s_input,
1424         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1425         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1426         .vidioc_g_parm          = vidioc_g_parm,
1427         .vidioc_s_parm          = vidioc_s_parm,
1428         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1429         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1430
1431         .vidioc_reqbufs         = vb2_ioctl_reqbufs,
1432         .vidioc_create_bufs     = vb2_ioctl_create_bufs,
1433         .vidioc_querybuf        = vb2_ioctl_querybuf,
1434         .vidioc_qbuf            = vb2_ioctl_qbuf,
1435         .vidioc_dqbuf           = vb2_ioctl_dqbuf,
1436         .vidioc_expbuf          = vb2_ioctl_expbuf,
1437         .vidioc_streamon        = vb2_ioctl_streamon,
1438         .vidioc_streamoff       = vb2_ioctl_streamoff,
1439
1440 #ifdef CONFIG_VIDEO_ADV_DEBUG
1441         .vidioc_g_chip_info     = vidioc_g_chip_info,
1442         .vidioc_g_register      = vidioc_g_register,
1443         .vidioc_s_register      = vidioc_s_register,
1444 #endif
1445         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1446         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1447 };
1448
1449 static const struct video_device gspca_template = {
1450         .name = "gspca main driver",
1451         .fops = &dev_fops,
1452         .ioctl_ops = &dev_ioctl_ops,
1453         .release = video_device_release_empty, /* We use v4l2_dev.release */
1454 };
1455
1456 /*
1457  * probe and create a new gspca device
1458  *
1459  * This function must be called by the sub-driver when it is
1460  * called for probing a new device.
1461  */
1462 int gspca_dev_probe2(struct usb_interface *intf,
1463                 const struct usb_device_id *id,
1464                 const struct sd_desc *sd_desc,
1465                 int dev_size,
1466                 struct module *module)
1467 {
1468         struct gspca_dev *gspca_dev;
1469         struct usb_device *dev = interface_to_usbdev(intf);
1470         struct vb2_queue *q;
1471         int ret;
1472
1473         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
1474                 sd_desc->name, id->idVendor, id->idProduct);
1475
1476         /* create the device */
1477         if (dev_size < sizeof *gspca_dev)
1478                 dev_size = sizeof *gspca_dev;
1479         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1480         if (!gspca_dev) {
1481                 pr_err("couldn't kzalloc gspca struct\n");
1482                 return -ENOMEM;
1483         }
1484         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1485         if (!gspca_dev->usb_buf) {
1486                 pr_err("out of memory\n");
1487                 ret = -ENOMEM;
1488                 goto out;
1489         }
1490         gspca_dev->dev = dev;
1491         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
1492         gspca_dev->xfer_ep = -1;
1493
1494         /* check if any audio device */
1495         if (dev->actconfig->desc.bNumInterfaces != 1) {
1496                 int i;
1497                 struct usb_interface *intf2;
1498
1499                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
1500                         intf2 = dev->actconfig->interface[i];
1501                         if (intf2 != NULL
1502                          && intf2->altsetting != NULL
1503                          && intf2->altsetting->desc.bInterfaceClass ==
1504                                          USB_CLASS_AUDIO) {
1505                                 gspca_dev->audio = 1;
1506                                 break;
1507                         }
1508                 }
1509         }
1510
1511         gspca_dev->v4l2_dev.release = gspca_release;
1512         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
1513         if (ret)
1514                 goto out;
1515         gspca_dev->present = true;
1516         gspca_dev->sd_desc = sd_desc;
1517         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1518         gspca_dev->vdev = gspca_template;
1519         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
1520         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
1521         gspca_dev->module = module;
1522
1523         mutex_init(&gspca_dev->usb_lock);
1524         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
1525         init_waitqueue_head(&gspca_dev->wq);
1526
1527         /* Initialize the vb2 queue */
1528         q = &gspca_dev->queue;
1529         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1530         q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
1531         q->drv_priv = gspca_dev;
1532         q->buf_struct_size = sizeof(struct gspca_buffer);
1533         q->ops = &gspca_qops;
1534         q->mem_ops = &vb2_vmalloc_memops;
1535         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1536         q->min_buffers_needed = 2;
1537         q->lock = &gspca_dev->usb_lock;
1538         ret = vb2_queue_init(q);
1539         if (ret)
1540                 goto out;
1541         gspca_dev->vdev.queue = q;
1542
1543         INIT_LIST_HEAD(&gspca_dev->buf_list);
1544         spin_lock_init(&gspca_dev->qlock);
1545
1546         /* configure the subdriver and initialize the USB device */
1547         ret = sd_desc->config(gspca_dev, id);
1548         if (ret < 0)
1549                 goto out;
1550         ret = sd_desc->init(gspca_dev);
1551         if (ret < 0)
1552                 goto out;
1553         if (sd_desc->init_controls)
1554                 ret = sd_desc->init_controls(gspca_dev);
1555         if (ret < 0)
1556                 goto out;
1557         gspca_set_default_mode(gspca_dev);
1558
1559         ret = gspca_input_connect(gspca_dev);
1560         if (ret)
1561                 goto out;
1562
1563 #ifdef CONFIG_VIDEO_ADV_DEBUG
1564         if (!gspca_dev->sd_desc->get_register)
1565                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
1566         if (!gspca_dev->sd_desc->set_register)
1567                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
1568 #endif
1569         if (!gspca_dev->sd_desc->get_jcomp)
1570                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
1571         if (!gspca_dev->sd_desc->set_jcomp)
1572                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
1573
1574         /* init video stuff */
1575         ret = video_register_device(&gspca_dev->vdev,
1576                                   VFL_TYPE_GRABBER,
1577                                   -1);
1578         if (ret < 0) {
1579                 pr_err("video_register_device err %d\n", ret);
1580                 goto out;
1581         }
1582
1583         usb_set_intfdata(intf, gspca_dev);
1584         gspca_dbg(gspca_dev, D_PROBE, "%s created\n",
1585                   video_device_node_name(&gspca_dev->vdev));
1586
1587         gspca_input_create_urb(gspca_dev);
1588
1589         return 0;
1590 out:
1591 #if IS_ENABLED(CONFIG_INPUT)
1592         if (gspca_dev->input_dev)
1593                 input_unregister_device(gspca_dev->input_dev);
1594 #endif
1595         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1596         kfree(gspca_dev->usb_buf);
1597         kfree(gspca_dev);
1598         return ret;
1599 }
1600 EXPORT_SYMBOL(gspca_dev_probe2);
1601
1602 /* same function as the previous one, but check the interface */
1603 int gspca_dev_probe(struct usb_interface *intf,
1604                 const struct usb_device_id *id,
1605                 const struct sd_desc *sd_desc,
1606                 int dev_size,
1607                 struct module *module)
1608 {
1609         struct usb_device *dev = interface_to_usbdev(intf);
1610
1611         /* we don't handle multi-config cameras */
1612         if (dev->descriptor.bNumConfigurations != 1) {
1613                 pr_err("%04x:%04x too many config\n",
1614                        id->idVendor, id->idProduct);
1615                 return -ENODEV;
1616         }
1617
1618         /* the USB video interface must be the first one */
1619         if (dev->actconfig->desc.bNumInterfaces != 1
1620          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
1621                 return -ENODEV;
1622
1623         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
1624 }
1625 EXPORT_SYMBOL(gspca_dev_probe);
1626
1627 /*
1628  * USB disconnection
1629  *
1630  * This function must be called by the sub-driver
1631  * when the device disconnects, after the specific resources are freed.
1632  */
1633 void gspca_disconnect(struct usb_interface *intf)
1634 {
1635         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1636 #if IS_ENABLED(CONFIG_INPUT)
1637         struct input_dev *input_dev;
1638 #endif
1639
1640         gspca_dbg(gspca_dev, D_PROBE, "%s disconnect\n",
1641                   video_device_node_name(&gspca_dev->vdev));
1642
1643         mutex_lock(&gspca_dev->usb_lock);
1644         gspca_dev->present = false;
1645         destroy_urbs(gspca_dev);
1646         gspca_input_destroy_urb(gspca_dev);
1647
1648         vb2_queue_error(&gspca_dev->queue);
1649
1650 #if IS_ENABLED(CONFIG_INPUT)
1651         input_dev = gspca_dev->input_dev;
1652         if (input_dev) {
1653                 gspca_dev->input_dev = NULL;
1654                 input_unregister_device(input_dev);
1655         }
1656 #endif
1657
1658         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
1659         video_unregister_device(&gspca_dev->vdev);
1660
1661         mutex_unlock(&gspca_dev->usb_lock);
1662
1663         /* (this will call gspca_release() immediately or on last close) */
1664         v4l2_device_put(&gspca_dev->v4l2_dev);
1665 }
1666 EXPORT_SYMBOL(gspca_disconnect);
1667
1668 #ifdef CONFIG_PM
1669 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1670 {
1671         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1672
1673         gspca_input_destroy_urb(gspca_dev);
1674
1675         if (!vb2_start_streaming_called(&gspca_dev->queue))
1676                 return 0;
1677
1678         mutex_lock(&gspca_dev->usb_lock);
1679         gspca_dev->frozen = 1;          /* avoid urb error messages */
1680         gspca_dev->usb_err = 0;
1681         if (gspca_dev->sd_desc->stopN)
1682                 gspca_dev->sd_desc->stopN(gspca_dev);
1683         destroy_urbs(gspca_dev);
1684         gspca_set_alt0(gspca_dev);
1685         if (gspca_dev->sd_desc->stop0)
1686                 gspca_dev->sd_desc->stop0(gspca_dev);
1687         mutex_unlock(&gspca_dev->usb_lock);
1688
1689         return 0;
1690 }
1691 EXPORT_SYMBOL(gspca_suspend);
1692
1693 int gspca_resume(struct usb_interface *intf)
1694 {
1695         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1696         int streaming, ret = 0;
1697
1698         mutex_lock(&gspca_dev->usb_lock);
1699         gspca_dev->frozen = 0;
1700         gspca_dev->usb_err = 0;
1701         gspca_dev->sd_desc->init(gspca_dev);
1702         /*
1703          * Most subdrivers send all ctrl values on sd_start and thus
1704          * only write to the device registers on s_ctrl when streaming ->
1705          * Clear streaming to avoid setting all ctrls twice.
1706          */
1707         streaming = vb2_start_streaming_called(&gspca_dev->queue);
1708         if (streaming)
1709                 ret = gspca_init_transfer(gspca_dev);
1710         else
1711                 gspca_input_create_urb(gspca_dev);
1712         mutex_unlock(&gspca_dev->usb_lock);
1713
1714         return ret;
1715 }
1716 EXPORT_SYMBOL(gspca_resume);
1717 #endif
1718
1719 /* -- module insert / remove -- */
1720 static int __init gspca_init(void)
1721 {
1722         pr_info("v" GSPCA_VERSION " registered\n");
1723         return 0;
1724 }
1725 static void __exit gspca_exit(void)
1726 {
1727 }
1728
1729 module_init(gspca_init);
1730 module_exit(gspca_exit);
1731
1732 module_param_named(debug, gspca_debug, int, 0644);
1733 MODULE_PARM_DESC(debug,
1734                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");