drivers/media/usb/gspca/gspca.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Main USB camera driver
   4  *
   5  * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
   6  *
   7  * Camera button input handling by Márton Németh
   8  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #define GSPCA_VERSION   "2.14.0"
  14
  15 #include <linux/init.h>
  16 #include <linux/fs.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/sched.h>
  19 #include <linux/slab.h>
  20 #include <linux/mm.h>
  21 #include <linux/string.h>
  22 #include <linux/pagemap.h>
  23 #include <linux/io.h>
  24 #include <asm/page.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/ktime.h>
  27 #include <media/v4l2-ioctl.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-fh.h>
  30 #include <media/v4l2-event.h>
  31
  32 #include "gspca.h"
  33
  34 #if IS_ENABLED(CONFIG_INPUT)
  35 #include <linux/input.h>
  36 #include <linux/usb/input.h>
  37 #endif
  38
  39 /* global values */
  40 #define DEF_NURBS 3             /* default number of URBs */
  41 #if DEF_NURBS > MAX_NURBS
  42 #error "DEF_NURBS too big"
  43 #endif
  44
  45 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  46 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  47 MODULE_LICENSE("GPL");
  48 MODULE_VERSION(GSPCA_VERSION);
  49
  50 int gspca_debug;
  51 EXPORT_SYMBOL(gspca_debug);
  52
  53 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
  54                         __u32 pixfmt, int w, int h)
  55 {
  56         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  57                 gspca_dbg(gspca_dev, debug, "%s %c%c%c%c %dx%d\n",
  58                           txt,
  59                           pixfmt & 0xff,
  60                           (pixfmt >> 8) & 0xff,
  61                           (pixfmt >> 16) & 0xff,
  62                           pixfmt >> 24,
  63                           w, h);
  64         } else {
  65                 gspca_dbg(gspca_dev, debug, "%s 0x%08x %dx%d\n",
  66                           txt,
  67                           pixfmt,
  68                           w, h);
  69         }
  70 }
  71
  72 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  73 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  74 #define GSPCA_MEMORY_READ 7
  75
  76 /*
  77  * Input and interrupt endpoint handling functions
  78  */
  79 #if IS_ENABLED(CONFIG_INPUT)
  80 static void int_irq(struct urb *urb)
  81 {
  82         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
  83         int ret;
  84
  85         ret = urb->status;
  86         switch (ret) {
  87         case 0:
  88                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
  89                     urb->transfer_buffer, urb->actual_length) < 0) {
  90                         gspca_err(gspca_dev, "Unknown packet received\n");
  91                 }
  92                 break;
  93
  94         case -ENOENT:
  95         case -ECONNRESET:
  96         case -ENODEV:
  97         case -ESHUTDOWN:
  98                 /* Stop is requested either by software or hardware is gone,
  99                  * keep the ret value non-zero and don't resubmit later.
 100                  */
 101                 break;
 102
 103         default:
 104                 gspca_err(gspca_dev, "URB error %i, resubmitting\n",
 105                           urb->status);
 106                 urb->status = 0;
 107                 ret = 0;
 108         }
 109
 110         if (ret == 0) {
 111                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 112                 if (ret < 0)
 113                         pr_err("Resubmit URB failed with error %i\n", ret);
 114         }
 115 }
 116
 117 static int gspca_input_connect(struct gspca_dev *dev)
 118 {
 119         struct input_dev *input_dev;
 120         int err = 0;
 121
 122         dev->input_dev = NULL;
 123         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 124                 input_dev = input_allocate_device();
 125                 if (!input_dev)
 126                         return -ENOMEM;
 127
 128                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 129                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 130
 131                 input_dev->name = dev->sd_desc->name;
 132                 input_dev->phys = dev->phys;
 133
 134                 usb_to_input_id(dev->dev, &input_dev->id);
 135
 136                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 137                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 138                 input_dev->dev.parent = &dev->dev->dev;
 139
 140                 err = input_register_device(input_dev);
 141                 if (err) {
 142                         pr_err("Input device registration failed with error %i\n",
 143                                err);
 144                         input_dev->dev.parent = NULL;
 145                         input_free_device(input_dev);
 146                 } else {
 147                         dev->input_dev = input_dev;
 148                 }
 149         }
 150
 151         return err;
 152 }
 153
 154 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 155                           struct usb_endpoint_descriptor *ep)
 156 {
 157         unsigned int buffer_len;
 158         int interval;
 159         struct urb *urb;
 160         struct usb_device *dev;
 161         void *buffer = NULL;
 162         int ret = -EINVAL;
 163
 164         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 165         interval = ep->bInterval;
 166         gspca_dbg(gspca_dev, D_CONF, "found int in endpoint: 0x%x, buffer_len=%u, interval=%u\n",
 167                   ep->bEndpointAddress, buffer_len, interval);
 168
 169         dev = gspca_dev->dev;
 170
 171         urb = usb_alloc_urb(0, GFP_KERNEL);
 172         if (!urb) {
 173                 ret = -ENOMEM;
 174                 goto error;
 175         }
 176
 177         buffer = usb_alloc_coherent(dev, buffer_len,
 178                                 GFP_KERNEL, &urb->transfer_dma);
 179         if (!buffer) {
 180                 ret = -ENOMEM;
 181                 goto error_buffer;
 182         }
 183         usb_fill_int_urb(urb, dev,
 184                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 185                 buffer, buffer_len,
 186                 int_irq, (void *)gspca_dev, interval);
 187         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 188         ret = usb_submit_urb(urb, GFP_KERNEL);
 189         if (ret < 0) {
 190                 gspca_err(gspca_dev, "submit int URB failed with error %i\n",
 191                           ret);
 192                 goto error_submit;
 193         }
 194         gspca_dev->int_urb = urb;
 195         return ret;
 196
 197 error_submit:
 198         usb_free_coherent(dev,
 199                           urb->transfer_buffer_length,
 200                           urb->transfer_buffer,
 201                           urb->transfer_dma);
 202 error_buffer:
 203         usb_free_urb(urb);
 204 error:
 205         return ret;
 206 }
 207
 208 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 209 {
 210         struct usb_interface *intf;
 211         struct usb_host_interface *intf_desc;
 212         struct usb_endpoint_descriptor *ep;
 213         int i;
 214
 215         if (gspca_dev->sd_desc->int_pkt_scan)  {
 216                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 217                 intf_desc = intf->cur_altsetting;
 218                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 219                         ep = &intf_desc->endpoint[i].desc;
 220                         if (usb_endpoint_dir_in(ep) &&
 221                             usb_endpoint_xfer_int(ep)) {
 222
 223                                 alloc_and_submit_int_urb(gspca_dev, ep);
 224                                 break;
 225                         }
 226                 }
 227         }
 228 }
 229
 230 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 231 {
 232         struct urb *urb;
 233
 234         urb = gspca_dev->int_urb;
 235         if (urb) {
 236                 gspca_dev->int_urb = NULL;
 237                 usb_kill_urb(urb);
 238                 usb_free_coherent(gspca_dev->dev,
 239                                   urb->transfer_buffer_length,
 240                                   urb->transfer_buffer,
 241                                   urb->transfer_dma);
 242                 usb_free_urb(urb);
 243         }
 244 }
 245 #else
 246 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 247 {
 248 }
 249
 250 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 251 {
 252 }
 253
 254 static inline int gspca_input_connect(struct gspca_dev *dev)
 255 {
 256         return 0;
 257 }
 258 #endif
 259
 260 /*
 261  * fill a video frame from an URB and resubmit
 262  */
 263 static void fill_frame(struct gspca_dev *gspca_dev,
 264                         struct urb *urb)
 265 {
 266         u8 *data;               /* address of data in the iso message */
 267         int i, len, st;
 268         cam_pkt_op pkt_scan;
 269
 270         if (urb->status != 0) {
 271                 if (urb->status == -ESHUTDOWN)
 272                         return;         /* disconnection */
 273 #ifdef CONFIG_PM
 274                 if (gspca_dev->frozen)
 275                         return;
 276 #endif
 277                 gspca_err(gspca_dev, "urb status: %d\n", urb->status);
 278                 urb->status = 0;
 279                 goto resubmit;
 280         }
 281         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 282         for (i = 0; i < urb->number_of_packets; i++) {
 283                 len = urb->iso_frame_desc[i].actual_length;
 284
 285                 /* check the packet status and length */
 286                 st = urb->iso_frame_desc[i].status;
 287                 if (st) {
 288                         gspca_dbg(gspca_dev, D_PACK, "ISOC data error: [%d] len=%d, status=%d\n",
 289                                i, len, st);
 290                         gspca_dev->last_packet_type = DISCARD_PACKET;
 291                         continue;
 292                 }
 293                 if (len == 0) {
 294                         if (gspca_dev->empty_packet == 0)
 295                                 gspca_dev->empty_packet = 1;
 296                         continue;
 297                 }
 298
 299                 /* let the packet be analyzed by the subdriver */
 300                 gspca_dbg(gspca_dev, D_PACK, "packet [%d] o:%d l:%d\n",
 301                           i, urb->iso_frame_desc[i].offset, len);
 302                 data = (u8 *) urb->transfer_buffer
 303                                         + urb->iso_frame_desc[i].offset;
 304                 pkt_scan(gspca_dev, data, len);
 305         }
 306
 307 resubmit:
 308         if (!gspca_dev->streaming)
 309                 return;
 310         /* resubmit the URB */
 311         st = usb_submit_urb(urb, GFP_ATOMIC);
 312         if (st < 0)
 313                 pr_err("usb_submit_urb() ret %d\n", st);
 314 }
 315
 316 /*
 317  * ISOC message interrupt from the USB device
 318  *
 319  * Analyse each packet and call the subdriver for copy to the frame buffer.
 320  */
 321 static void isoc_irq(struct urb *urb)
 322 {
 323         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 324
 325         gspca_dbg(gspca_dev, D_PACK, "isoc irq\n");
 326         if (!gspca_dev->streaming)
 327                 return;
 328         fill_frame(gspca_dev, urb);
 329 }
 330
 331 /*
 332  * bulk message interrupt from the USB device
 333  */
 334 static void bulk_irq(struct urb *urb)
 335 {
 336         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 337         int st;
 338
 339         gspca_dbg(gspca_dev, D_PACK, "bulk irq\n");
 340         if (!gspca_dev->streaming)
 341                 return;
 342         switch (urb->status) {
 343         case 0:
 344                 break;
 345         case -ESHUTDOWN:
 346                 return;         /* disconnection */
 347         default:
 348 #ifdef CONFIG_PM
 349                 if (gspca_dev->frozen)
 350                         return;
 351 #endif
 352                 gspca_err(gspca_dev, "urb status: %d\n", urb->status);
 353                 urb->status = 0;
 354                 goto resubmit;
 355         }
 356
 357         gspca_dbg(gspca_dev, D_PACK, "packet l:%d\n", urb->actual_length);
 358         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 359                                 urb->transfer_buffer,
 360                                 urb->actual_length);
 361
 362 resubmit:
 363         if (!gspca_dev->streaming)
 364                 return;
 365         /* resubmit the URB */
 366         if (gspca_dev->cam.bulk_nurbs != 0) {
 367                 st = usb_submit_urb(urb, GFP_ATOMIC);
 368                 if (st < 0)
 369                         pr_err("usb_submit_urb() ret %d\n", st);
 370         }
 371 }
 372
 373 /*
 374  * add data to the current frame
 375  *
 376  * This function is called by the subdrivers at interrupt level.
 377  *
 378  * To build a frame, these ones must add
 379  *      - one FIRST_PACKET
 380  *      - 0 or many INTER_PACKETs
 381  *      - one LAST_PACKET
 382  * DISCARD_PACKET invalidates the whole frame.
 383  */
 384 void gspca_frame_add(struct gspca_dev *gspca_dev,
 385                         enum gspca_packet_type packet_type,
 386                         const u8 *data,
 387                         int len)
 388 {
 389         struct gspca_buffer *buf;
 390         unsigned long flags;
 391
 392         gspca_dbg(gspca_dev, D_PACK, "add t:%d l:%d\n", packet_type, len);
 393
 394         spin_lock_irqsave(&gspca_dev->qlock, flags);
 395         buf = list_first_entry_or_null(&gspca_dev->buf_list,
 396                                        typeof(*buf), list);
 397         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
 398
 399         if (packet_type == FIRST_PACKET) {
 400                 /* if there is no queued buffer, discard the whole frame */
 401                 if (!buf) {
 402                         gspca_dev->last_packet_type = DISCARD_PACKET;
 403                         gspca_dev->sequence++;
 404                         return;
 405                 }
 406                 gspca_dev->image = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 407                 gspca_dev->image_len = 0;
 408         } else {
 409                 switch (gspca_dev->last_packet_type) {
 410                 case DISCARD_PACKET:
 411                         if (packet_type == LAST_PACKET) {
 412                                 gspca_dev->last_packet_type = packet_type;
 413                                 gspca_dev->image = NULL;
 414                                 gspca_dev->image_len = 0;
 415                         }
 416                         return;
 417                 case LAST_PACKET:
 418                         return;
 419                 }
 420         }
 421
 422         /* append the packet to the frame buffer */
 423         if (len > 0) {
 424                 if (gspca_dev->image_len + len > PAGE_ALIGN(gspca_dev->pixfmt.sizeimage)) {
 425                         gspca_err(gspca_dev, "frame overflow %d > %d\n",
 426                                   gspca_dev->image_len + len,
 427                                   PAGE_ALIGN(gspca_dev->pixfmt.sizeimage));
 428                         packet_type = DISCARD_PACKET;
 429                 } else {
 430 /* !! image is NULL only when last pkt is LAST or DISCARD
 431                         if (gspca_dev->image == NULL) {
 432                                 pr_err("gspca_frame_add() image == NULL\n");
 433                                 return;
 434                         }
 435  */
 436                         memcpy(gspca_dev->image + gspca_dev->image_len,
 437                                 data, len);
 438                         gspca_dev->image_len += len;
 439                 }
 440         }
 441         gspca_dev->last_packet_type = packet_type;
 442
 443         /* if last packet, invalidate packet concatenation until
 444          * next first packet, wake up the application and advance
 445          * in the queue */
 446         if (packet_type == LAST_PACKET) {
 447                 spin_lock_irqsave(&gspca_dev->qlock, flags);
 448                 list_del(&buf->list);
 449                 spin_unlock_irqrestore(&gspca_dev->qlock, flags);
 450                 buf->vb.vb2_buf.timestamp = ktime_get_ns();
 451                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0,
 452                                       gspca_dev->image_len);
 453                 buf->vb.sequence = gspca_dev->sequence++;
 454                 buf->vb.field = V4L2_FIELD_NONE;
 455                 gspca_dbg(gspca_dev, D_FRAM, "frame complete len:%d\n",
 456                           gspca_dev->image_len);
 457                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 458                 gspca_dev->image = NULL;
 459                 gspca_dev->image_len = 0;
 460         }
 461 }
 462 EXPORT_SYMBOL(gspca_frame_add);
 463
 464 static void destroy_urbs(struct gspca_dev *gspca_dev)
 465 {
 466         struct urb *urb;
 467         unsigned int i;
 468
 469         gspca_dbg(gspca_dev, D_STREAM, "kill transfer\n");
 470
 471         /* Killing all URBs guarantee that no URB completion
 472          * handler is running. Therefore, there shouldn't
 473          * be anyone trying to access gspca_dev->urb[i]
 474          */
 475         for (i = 0; i < MAX_NURBS; i++)
 476                 usb_kill_urb(gspca_dev->urb[i]);
 477
 478         gspca_dbg(gspca_dev, D_STREAM, "releasing urbs\n");
 479         for (i = 0; i < MAX_NURBS; i++) {
 480                 urb = gspca_dev->urb[i];
 481                 if (!urb)
 482                         continue;
 483                 gspca_dev->urb[i] = NULL;
 484                 usb_free_coherent(gspca_dev->dev,
 485                                   urb->transfer_buffer_length,
 486                                   urb->transfer_buffer,
 487                                   urb->transfer_dma);
 488                 usb_free_urb(urb);
 489         }
 490 }
 491
 492 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 493 {
 494         int ret;
 495
 496         if (gspca_dev->alt == 0)
 497                 return 0;
 498         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 499         if (ret < 0)
 500                 pr_err("set alt 0 err %d\n", ret);
 501         return ret;
 502 }
 503
 504 /*
 505  * look for an input transfer endpoint in an alternate setting.
 506  *
 507  * If xfer_ep is invalid, return the first valid ep found, otherwise
 508  * look for exactly the ep with address equal to xfer_ep.
 509  */
 510 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 511                                           int xfer, int xfer_ep)
 512 {
 513         struct usb_host_endpoint *ep;
 514         int i, attr;
 515
 516         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 517                 ep = &alt->endpoint[i];
 518                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 519                 if (attr == xfer
 520                     && ep->desc.wMaxPacketSize != 0
 521                     && usb_endpoint_dir_in(&ep->desc)
 522                     && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
 523                         return ep;
 524         }
 525         return NULL;
 526 }
 527
 528 /* compute the minimum bandwidth for the current transfer */
 529 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 530 {
 531         u32 bandwidth;
 532
 533         /* get the (max) image size */
 534         bandwidth = gspca_dev->pixfmt.sizeimage;
 535
 536         /* if the image is compressed, estimate its mean size */
 537         if (!gspca_dev->cam.needs_full_bandwidth &&
 538             bandwidth < gspca_dev->pixfmt.width *
 539                                 gspca_dev->pixfmt.height)
 540                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 541
 542         /* estimate the frame rate */
 543         if (gspca_dev->sd_desc->get_streamparm) {
 544                 struct v4l2_streamparm parm;
 545
 546                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 547                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 548                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 549         } else {
 550
 551                 /* don't hope more than 15 fps with USB 1.1 and
 552                  * image resolution >= 640x480 */
 553                 if (gspca_dev->pixfmt.width >= 640
 554                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 555                         bandwidth *= 15;                /* 15 fps */
 556                 else
 557                         bandwidth *= 30;                /* 30 fps */
 558         }
 559
 560         gspca_dbg(gspca_dev, D_STREAM, "min bandwidth: %d\n", bandwidth);
 561         return bandwidth;
 562 }
 563
 564 /* endpoint table */
 565 #define MAX_ALT 16
 566 struct ep_tb_s {
 567         u32 alt;
 568         u32 bandwidth;
 569 };
 570
 571 /*
 572  * build the table of the endpoints
 573  * and compute the minimum bandwidth for the image transfer
 574  */
 575 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 576                         struct usb_interface *intf,
 577                         struct ep_tb_s *ep_tb)
 578 {
 579         struct usb_host_endpoint *ep;
 580         int i, j, nbalt, psize, found;
 581         u32 bandwidth, last_bw;
 582
 583         nbalt = intf->num_altsetting;
 584         if (nbalt > MAX_ALT)
 585                 nbalt = MAX_ALT;        /* fixme: should warn */
 586
 587         /* build the endpoint table */
 588         i = 0;
 589         last_bw = 0;
 590         for (;;) {
 591                 ep_tb->bandwidth = 2000 * 2000 * 120;
 592                 found = 0;
 593                 for (j = 0; j < nbalt; j++) {
 594                         ep = alt_xfer(&intf->altsetting[j],
 595                                       USB_ENDPOINT_XFER_ISOC,
 596                                       gspca_dev->xfer_ep);
 597                         if (ep == NULL)
 598                                 continue;
 599                         if (ep->desc.bInterval == 0) {
 600                                 pr_err("alt %d iso endp with 0 interval\n", j);
 601                                 continue;
 602                         }
 603                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 604                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 605                         bandwidth = psize * 1000;
 606                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 607                          || gspca_dev->dev->speed >= USB_SPEED_SUPER)
 608                                 bandwidth *= 8;
 609                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 610                         if (bandwidth <= last_bw)
 611                                 continue;
 612                         if (bandwidth < ep_tb->bandwidth) {
 613                                 ep_tb->bandwidth = bandwidth;
 614                                 ep_tb->alt = j;
 615                                 found = 1;
 616                         }
 617                 }
 618                 if (!found)
 619                         break;
 620                 gspca_dbg(gspca_dev, D_STREAM, "alt %d bandwidth %d\n",
 621                           ep_tb->alt, ep_tb->bandwidth);
 622                 last_bw = ep_tb->bandwidth;
 623                 i++;
 624                 ep_tb++;
 625         }
 626
 627         /*
 628          * If the camera:
 629          * has a usb audio class interface (a built in usb mic); and
 630          * is a usb 1 full speed device; and
 631          * uses the max full speed iso bandwidth; and
 632          * and has more than 1 alt setting
 633          * then skip the highest alt setting to spare bandwidth for the mic
 634          */
 635         if (gspca_dev->audio &&
 636                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 637                         last_bw >= 1000000 &&
 638                         i > 1) {
 639                 gspca_dbg(gspca_dev, D_STREAM, "dev has usb audio, skipping highest alt\n");
 640                 i--;
 641                 ep_tb--;
 642         }
 643
 644         /* get the requested bandwidth and start at the highest atlsetting */
 645         bandwidth = which_bandwidth(gspca_dev);
 646         ep_tb--;
 647         while (i > 1) {
 648                 ep_tb--;
 649                 if (ep_tb->bandwidth < bandwidth)
 650                         break;
 651                 i--;
 652         }
 653         return i;
 654 }
 655
 656 /*
 657  * create the URBs for image transfer
 658  */
 659 static int create_urbs(struct gspca_dev *gspca_dev,
 660                         struct usb_host_endpoint *ep)
 661 {
 662         struct urb *urb;
 663         int n, nurbs, i, psize, npkt, bsize;
 664
 665         /* calculate the packet size and the number of packets */
 666         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 667
 668         if (!gspca_dev->cam.bulk) {             /* isoc */
 669
 670                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 671                 if (gspca_dev->pkt_size == 0)
 672                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 673                 else
 674                         psize = gspca_dev->pkt_size;
 675                 npkt = gspca_dev->cam.npkt;
 676                 if (npkt == 0)
 677                         npkt = 32;              /* default value */
 678                 bsize = psize * npkt;
 679                 gspca_dbg(gspca_dev, D_STREAM,
 680                           "isoc %d pkts size %d = bsize:%d\n",
 681                           npkt, psize, bsize);
 682                 nurbs = DEF_NURBS;
 683         } else {                                /* bulk */
 684                 npkt = 0;
 685                 bsize = gspca_dev->cam.bulk_size;
 686                 if (bsize == 0)
 687                         bsize = psize;
 688                 gspca_dbg(gspca_dev, D_STREAM, "bulk bsize:%d\n", bsize);
 689                 if (gspca_dev->cam.bulk_nurbs != 0)
 690                         nurbs = gspca_dev->cam.bulk_nurbs;
 691                 else
 692                         nurbs = 1;
 693         }
 694
 695         for (n = 0; n < nurbs; n++) {
 696                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 697                 if (!urb)
 698                         return -ENOMEM;
 699                 gspca_dev->urb[n] = urb;
 700                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 701                                                 bsize,
 702                                                 GFP_KERNEL,
 703                                                 &urb->transfer_dma);
 704
 705                 if (urb->transfer_buffer == NULL) {
 706                         pr_err("usb_alloc_coherent failed\n");
 707                         return -ENOMEM;
 708                 }
 709                 urb->dev = gspca_dev->dev;
 710                 urb->context = gspca_dev;
 711                 urb->transfer_buffer_length = bsize;
 712                 if (npkt != 0) {                /* ISOC */
 713                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 714                                                     ep->desc.bEndpointAddress);
 715                         urb->transfer_flags = URB_ISO_ASAP
 716                                         | URB_NO_TRANSFER_DMA_MAP;
 717                         urb->interval = 1 << (ep->desc.bInterval - 1);
 718                         urb->complete = isoc_irq;
 719                         urb->number_of_packets = npkt;
 720                         for (i = 0; i < npkt; i++) {
 721                                 urb->iso_frame_desc[i].length = psize;
 722                                 urb->iso_frame_desc[i].offset = psize * i;
 723                         }
 724                 } else {                /* bulk */
 725                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 726                                                 ep->desc.bEndpointAddress);
 727                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 728                         urb->complete = bulk_irq;
 729                 }
 730         }
 731         return 0;
 732 }
 733
 734 /* Note: both the queue and the usb locks should be held when calling this */
 735 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 736 {
 737         gspca_dev->streaming = false;
 738         gspca_dev->usb_err = 0;
 739         if (gspca_dev->sd_desc->stopN)
 740                 gspca_dev->sd_desc->stopN(gspca_dev);
 741         destroy_urbs(gspca_dev);
 742         gspca_input_destroy_urb(gspca_dev);
 743         gspca_set_alt0(gspca_dev);
 744         if (gspca_dev->present)
 745                 gspca_input_create_urb(gspca_dev);
 746         if (gspca_dev->sd_desc->stop0)
 747                 gspca_dev->sd_desc->stop0(gspca_dev);
 748         gspca_dbg(gspca_dev, D_STREAM, "stream off OK\n");
 749 }
 750
 751 /*
 752  * start the USB transfer
 753  */
 754 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 755 {
 756         struct usb_interface *intf;
 757         struct usb_host_endpoint *ep;
 758         struct urb *urb;
 759         struct ep_tb_s ep_tb[MAX_ALT];
 760         int n, ret, xfer, alt, alt_idx;
 761
 762         /* reset the streaming variables */
 763         gspca_dev->image = NULL;
 764         gspca_dev->image_len = 0;
 765         gspca_dev->last_packet_type = DISCARD_PACKET;
 766
 767         gspca_dev->usb_err = 0;
 768
 769         /* do the specific subdriver stuff before endpoint selection */
 770         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 771         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 772         if (gspca_dev->sd_desc->isoc_init) {
 773                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 774                 if (ret < 0)
 775                         return ret;
 776         }
 777         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 778                                    : USB_ENDPOINT_XFER_ISOC;
 779
 780         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 781         if (gspca_dev->alt != 0) {
 782                 gspca_dev->alt--;       /* (previous version compatibility) */
 783                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
 784                               gspca_dev->xfer_ep);
 785                 if (ep == NULL) {
 786                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 787                         return -EIO;
 788                 }
 789                 ep_tb[0].alt = gspca_dev->alt;
 790                 alt_idx = 1;
 791         } else {
 792                 /* else, compute the minimum bandwidth
 793                  * and build the endpoint table */
 794                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 795                 if (alt_idx <= 0) {
 796                         pr_err("no transfer endpoint found\n");
 797                         return -EIO;
 798                 }
 799         }
 800
 801         /* set the highest alternate setting and
 802          * loop until urb submit succeeds */
 803         gspca_input_destroy_urb(gspca_dev);
 804
 805         gspca_dev->alt = ep_tb[--alt_idx].alt;
 806         alt = -1;
 807         for (;;) {
 808                 if (alt != gspca_dev->alt) {
 809                         alt = gspca_dev->alt;
 810                         if (intf->num_altsetting > 1) {
 811                                 ret = usb_set_interface(gspca_dev->dev,
 812                                                         gspca_dev->iface,
 813                                                         alt);
 814                                 if (ret < 0) {
 815                                         if (ret == -ENOSPC)
 816                                                 goto retry; /*fixme: ugly*/
 817                                         pr_err("set alt %d err %d\n", alt, ret);
 818                                         goto out;
 819                                 }
 820                         }
 821                 }
 822                 if (!gspca_dev->cam.no_urb_create) {
 823                         gspca_dbg(gspca_dev, D_STREAM, "init transfer alt %d\n",
 824                                   alt);
 825                         ret = create_urbs(gspca_dev,
 826                                 alt_xfer(&intf->altsetting[alt], xfer,
 827                                          gspca_dev->xfer_ep));
 828                         if (ret < 0) {
 829                                 destroy_urbs(gspca_dev);
 830                                 goto out;
 831                         }
 832                 }
 833
 834                 /* clear the bulk endpoint */
 835                 if (gspca_dev->cam.bulk)
 836                         usb_clear_halt(gspca_dev->dev,
 837                                         gspca_dev->urb[0]->pipe);
 838
 839                 /* start the cam */
 840                 ret = gspca_dev->sd_desc->start(gspca_dev);
 841                 if (ret < 0) {
 842                         destroy_urbs(gspca_dev);
 843                         goto out;
 844                 }
 845                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 846                 gspca_dev->streaming = true;
 847
 848                 /* some bulk transfers are started by the subdriver */
 849                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 850                         break;
 851
 852                 /* submit the URBs */
 853                 for (n = 0; n < MAX_NURBS; n++) {
 854                         urb = gspca_dev->urb[n];
 855                         if (urb == NULL)
 856                                 break;
 857                         ret = usb_submit_urb(urb, GFP_KERNEL);
 858                         if (ret < 0)
 859                                 break;
 860                 }
 861                 if (ret >= 0)
 862                         break;                  /* transfer is started */
 863
 864                 /* something when wrong
 865                  * stop the webcam and free the transfer resources */
 866                 gspca_stream_off(gspca_dev);
 867                 if (ret != -ENOSPC) {
 868                         pr_err("usb_submit_urb alt %d err %d\n",
 869                                gspca_dev->alt, ret);
 870                         goto out;
 871                 }
 872
 873                 /* the bandwidth is not wide enough
 874                  * negotiate or try a lower alternate setting */
 875 retry:
 876                 gspca_err(gspca_dev, "alt %d - bandwidth not wide enough, trying again\n",
 877                           alt);
 878                 msleep(20);     /* wait for kill complete */
 879                 if (gspca_dev->sd_desc->isoc_nego) {
 880                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 881                         if (ret < 0)
 882                                 goto out;
 883                 } else {
 884                         if (alt_idx <= 0) {
 885                                 pr_err("no transfer endpoint found\n");
 886                                 ret = -EIO;
 887                                 goto out;
 888                         }
 889                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 890                 }
 891         }
 892 out:
 893         gspca_input_create_urb(gspca_dev);
 894         return ret;
 895 }
 896
 897 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 898 {
 899         int i;
 900
 901         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 902         gspca_dev->curr_mode = i;
 903         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
 904
 905         /* does nothing if ctrl_handler == NULL */
 906         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 907 }
 908
 909 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 910                         int width, int height, u32 pixelformat)
 911 {
 912         int i;
 913
 914         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 915                 if (width == gspca_dev->cam.cam_mode[i].width
 916                     && height == gspca_dev->cam.cam_mode[i].height
 917                     && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
 918                         return i;
 919         }
 920         return -EINVAL;
 921 }
 922
 923 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
 924                         int width, int height, u32 pixelformat)
 925 {
 926         int i;
 927
 928         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 929                 if (width >= gspca_dev->cam.cam_mode[i].width
 930                     && height >= gspca_dev->cam.cam_mode[i].height
 931                     && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
 932                         return i;
 933         }
 934         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 935                 if (width >= gspca_dev->cam.cam_mode[i].width
 936                     && height >= gspca_dev->cam.cam_mode[i].height)
 937                         break;
 938         }
 939         return i;
 940 }
 941
 942 /*
 943  * search a mode with the right pixel format
 944  */
 945 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 946                         int mode,
 947                         int pixfmt)
 948 {
 949         int modeU, modeD;
 950
 951         modeU = modeD = mode;
 952         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 953                 if (--modeD >= 0) {
 954                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 955                                                                 == pixfmt)
 956                                 return modeD;
 957                 }
 958                 if (++modeU < gspca_dev->cam.nmodes) {
 959                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 960                                                                 == pixfmt)
 961                                 return modeU;
 962                 }
 963         }
 964         return -EINVAL;
 965 }
 966
 967 #ifdef CONFIG_VIDEO_ADV_DEBUG
 968 static int vidioc_g_chip_info(struct file *file, void *priv,
 969                                 struct v4l2_dbg_chip_info *chip)
 970 {
 971         struct gspca_dev *gspca_dev = video_drvdata(file);
 972
 973         gspca_dev->usb_err = 0;
 974         if (gspca_dev->sd_desc->get_chip_info)
 975                 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
 976         return chip->match.addr ? -EINVAL : 0;
 977 }
 978
 979 static int vidioc_g_register(struct file *file, void *priv,
 980                 struct v4l2_dbg_register *reg)
 981 {
 982         struct gspca_dev *gspca_dev = video_drvdata(file);
 983
 984         gspca_dev->usb_err = 0;
 985         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
 986 }
 987
 988 static int vidioc_s_register(struct file *file, void *priv,
 989                 const 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->set_register(gspca_dev, reg);
 995 }
 996 #endif
 997
 998 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 999                                 struct v4l2_fmtdesc *fmtdesc)
1000 {
1001         struct gspca_dev *gspca_dev = video_drvdata(file);
1002         int i, j, index;
1003         __u32 fmt_tb[8];
1004
1005         /* give an index to each format */
1006         index = 0;
1007         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1008                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1009                 j = 0;
1010                 for (;;) {
1011                         if (fmt_tb[j] == fmt_tb[index])
1012                                 break;
1013                         j++;
1014                 }
1015                 if (j == index) {
1016                         if (fmtdesc->index == index)
1017                                 break;          /* new format */
1018                         index++;
1019                         if (index >= ARRAY_SIZE(fmt_tb))
1020                                 return -EINVAL;
1021                 }
1022         }
1023         if (i < 0)
1024                 return -EINVAL;         /* no more format */
1025
1026         fmtdesc->pixelformat = fmt_tb[index];
1027         if (gspca_dev->cam.cam_mode[i].sizeimage <
1028                         gspca_dev->cam.cam_mode[i].width *
1029                                 gspca_dev->cam.cam_mode[i].height)
1030                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1031         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1032         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1033         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1034         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1035         fmtdesc->description[4] = '\0';
1036         return 0;
1037 }
1038
1039 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1040                             struct v4l2_format *fmt)
1041 {
1042         struct gspca_dev *gspca_dev = video_drvdata(file);
1043
1044         fmt->fmt.pix = gspca_dev->pixfmt;
1045         /* some drivers use priv internally, zero it before giving it back to
1046            the core */
1047         fmt->fmt.pix.priv = 0;
1048         return 0;
1049 }
1050
1051 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1052                         struct v4l2_format *fmt)
1053 {
1054         int w, h, mode, mode2;
1055
1056         w = fmt->fmt.pix.width;
1057         h = fmt->fmt.pix.height;
1058
1059         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1060                     fmt->fmt.pix.pixelformat, w, h);
1061
1062         /* search the nearest mode for width and height */
1063         mode = wxh_to_nearest_mode(gspca_dev, w, h, fmt->fmt.pix.pixelformat);
1064
1065         /* OK if right palette */
1066         if (gspca_dev->cam.cam_mode[mode].pixelformat
1067                                                 != fmt->fmt.pix.pixelformat) {
1068
1069                 /* else, search the closest mode with the same pixel format */
1070                 mode2 = gspca_get_mode(gspca_dev, mode,
1071                                         fmt->fmt.pix.pixelformat);
1072                 if (mode2 >= 0)
1073                         mode = mode2;
1074         }
1075         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1076         if (gspca_dev->sd_desc->try_fmt) {
1077                 /* pass original resolution to subdriver try_fmt */
1078                 fmt->fmt.pix.width = w;
1079                 fmt->fmt.pix.height = h;
1080                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1081         }
1082         /* some drivers use priv internally, zero it before giving it back to
1083            the core */
1084         fmt->fmt.pix.priv = 0;
1085         return mode;                    /* used when s_fmt */
1086 }
1087
1088 static int vidioc_try_fmt_vid_cap(struct file *file,
1089                               void *priv,
1090                               struct v4l2_format *fmt)
1091 {
1092         struct gspca_dev *gspca_dev = video_drvdata(file);
1093
1094         if (try_fmt_vid_cap(gspca_dev, fmt) < 0)
1095                 return -EINVAL;
1096         return 0;
1097 }
1098
1099 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1100                             struct v4l2_format *fmt)
1101 {
1102         struct gspca_dev *gspca_dev = video_drvdata(file);
1103         int mode;
1104
1105         if (vb2_is_busy(&gspca_dev->queue))
1106                 return -EBUSY;
1107
1108         mode = try_fmt_vid_cap(gspca_dev, fmt);
1109         if (mode < 0)
1110                 return -EINVAL;
1111
1112         gspca_dev->curr_mode = mode;
1113         if (gspca_dev->sd_desc->try_fmt)
1114                 /* subdriver try_fmt can modify format parameters */
1115                 gspca_dev->pixfmt = fmt->fmt.pix;
1116         else
1117                 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[mode];
1118         return 0;
1119 }
1120
1121 static int vidioc_enum_framesizes(struct file *file, void *priv,
1122                                   struct v4l2_frmsizeenum *fsize)
1123 {
1124         struct gspca_dev *gspca_dev = video_drvdata(file);
1125         int i;
1126         __u32 index = 0;
1127
1128         if (gspca_dev->sd_desc->enum_framesizes)
1129                 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1130
1131         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1132                 if (fsize->pixel_format !=
1133                                 gspca_dev->cam.cam_mode[i].pixelformat)
1134                         continue;
1135
1136                 if (fsize->index == index) {
1137                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1138                         fsize->discrete.width =
1139                                 gspca_dev->cam.cam_mode[i].width;
1140                         fsize->discrete.height =
1141                                 gspca_dev->cam.cam_mode[i].height;
1142                         return 0;
1143                 }
1144                 index++;
1145         }
1146
1147         return -EINVAL;
1148 }
1149
1150 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1151                                       struct v4l2_frmivalenum *fival)
1152 {
1153         struct gspca_dev *gspca_dev = video_drvdata(filp);
1154         int mode;
1155         __u32 i;
1156
1157         mode = wxh_to_mode(gspca_dev, fival->width, fival->height,
1158                            fival->pixel_format);
1159         if (mode < 0)
1160                 return -EINVAL;
1161
1162         if (gspca_dev->cam.mode_framerates == NULL ||
1163                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1164                 return -EINVAL;
1165
1166         if (fival->pixel_format !=
1167                         gspca_dev->cam.cam_mode[mode].pixelformat)
1168                 return -EINVAL;
1169
1170         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1171                 if (fival->index == i) {
1172                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1173                         fival->discrete.numerator = 1;
1174                         fival->discrete.denominator =
1175                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1176                         return 0;
1177                 }
1178         }
1179
1180         return -EINVAL;
1181 }
1182
1183 static void gspca_release(struct v4l2_device *v4l2_device)
1184 {
1185         struct gspca_dev *gspca_dev =
1186                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1187
1188         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1189         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1190         kfree(gspca_dev->usb_buf);
1191         kfree(gspca_dev);
1192 }
1193
1194 static int vidioc_querycap(struct file *file, void  *priv,
1195                            struct v4l2_capability *cap)
1196 {
1197         struct gspca_dev *gspca_dev = video_drvdata(file);
1198
1199         strscpy((char *)cap->driver, gspca_dev->sd_desc->name,
1200                 sizeof(cap->driver));
1201         if (gspca_dev->dev->product != NULL) {
1202                 strscpy((char *)cap->card, gspca_dev->dev->product,
1203                         sizeof(cap->card));
1204         } else {
1205                 snprintf((char *) cap->card, sizeof cap->card,
1206                         "USB Camera (%04x:%04x)",
1207                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1208                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1209         }
1210         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1211                         sizeof(cap->bus_info));
1212         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1213                           | V4L2_CAP_STREAMING
1214                           | V4L2_CAP_READWRITE;
1215         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1216         return 0;
1217 }
1218
1219 static int vidioc_enum_input(struct file *file, void *priv,
1220                                 struct v4l2_input *input)
1221 {
1222         struct gspca_dev *gspca_dev = video_drvdata(file);
1223
1224         if (input->index != 0)
1225                 return -EINVAL;
1226         input->type = V4L2_INPUT_TYPE_CAMERA;
1227         input->status = gspca_dev->cam.input_flags;
1228         strscpy(input->name, gspca_dev->sd_desc->name,
1229                 sizeof input->name);
1230         return 0;
1231 }
1232
1233 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1234 {
1235         *i = 0;
1236         return 0;
1237 }
1238
1239 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1240 {
1241         if (i > 0)
1242                 return -EINVAL;
1243         return 0;
1244 }
1245
1246 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1247                         struct v4l2_jpegcompression *jpegcomp)
1248 {
1249         struct gspca_dev *gspca_dev = video_drvdata(file);
1250
1251         gspca_dev->usb_err = 0;
1252         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1253 }
1254
1255 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1256                         const 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->set_jcomp(gspca_dev, jpegcomp);
1262 }
1263
1264 static int vidioc_g_parm(struct file *filp, void *priv,
1265                         struct v4l2_streamparm *parm)
1266 {
1267         struct gspca_dev *gspca_dev = video_drvdata(filp);
1268
1269         parm->parm.capture.readbuffers = gspca_dev->queue.min_buffers_needed;
1270
1271         if (!gspca_dev->sd_desc->get_streamparm)
1272                 return 0;
1273
1274         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1275         gspca_dev->usb_err = 0;
1276         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1277         return gspca_dev->usb_err;
1278 }
1279
1280 static int vidioc_s_parm(struct file *filp, void *priv,
1281                         struct v4l2_streamparm *parm)
1282 {
1283         struct gspca_dev *gspca_dev = video_drvdata(filp);
1284
1285         parm->parm.capture.readbuffers = gspca_dev->queue.min_buffers_needed;
1286
1287         if (!gspca_dev->sd_desc->set_streamparm) {
1288                 parm->parm.capture.capability = 0;
1289                 return 0;
1290         }
1291
1292         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1293         gspca_dev->usb_err = 0;
1294         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1295         return gspca_dev->usb_err;
1296 }
1297
1298 static int gspca_queue_setup(struct vb2_queue *vq,
1299                              unsigned int *nbuffers, unsigned int *nplanes,
1300                              unsigned int sizes[], struct device *alloc_devs[])
1301 {
1302         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1303         unsigned int size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1304
1305         if (*nplanes)
1306                 return sizes[0] < size ? -EINVAL : 0;
1307         *nplanes = 1;
1308         sizes[0] = size;
1309         return 0;
1310 }
1311
1312 static int gspca_buffer_prepare(struct vb2_buffer *vb)
1313 {
1314         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1315         unsigned long size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1316
1317         if (vb2_plane_size(vb, 0) < size) {
1318                 gspca_err(gspca_dev, "buffer too small (%lu < %lu)\n",
1319                          vb2_plane_size(vb, 0), size);
1320                 return -EINVAL;
1321         }
1322         return 0;
1323 }
1324
1325 static void gspca_buffer_finish(struct vb2_buffer *vb)
1326 {
1327         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1328
1329         if (!gspca_dev->sd_desc->dq_callback)
1330                 return;
1331
1332         gspca_dev->usb_err = 0;
1333         if (gspca_dev->present)
1334                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1335 }
1336
1337 static void gspca_buffer_queue(struct vb2_buffer *vb)
1338 {
1339         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1340         struct gspca_buffer *buf = to_gspca_buffer(vb);
1341         unsigned long flags;
1342
1343         spin_lock_irqsave(&gspca_dev->qlock, flags);
1344         list_add_tail(&buf->list, &gspca_dev->buf_list);
1345         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1346 }
1347
1348 static void gspca_return_all_buffers(struct gspca_dev *gspca_dev,
1349                                      enum vb2_buffer_state state)
1350 {
1351         struct gspca_buffer *buf, *node;
1352         unsigned long flags;
1353
1354         spin_lock_irqsave(&gspca_dev->qlock, flags);
1355         list_for_each_entry_safe(buf, node, &gspca_dev->buf_list, list) {
1356                 vb2_buffer_done(&buf->vb.vb2_buf, state);
1357                 list_del(&buf->list);
1358         }
1359         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1360 }
1361
1362 static int gspca_start_streaming(struct vb2_queue *vq, unsigned int count)
1363 {
1364         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1365         int ret;
1366
1367         gspca_dev->sequence = 0;
1368
1369         ret = gspca_init_transfer(gspca_dev);
1370         if (ret)
1371                 gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_QUEUED);
1372         return ret;
1373 }
1374
1375 static void gspca_stop_streaming(struct vb2_queue *vq)
1376 {
1377         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1378
1379         gspca_stream_off(gspca_dev);
1380
1381         /* Release all active buffers */
1382         gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_ERROR);
1383 }
1384
1385 static const struct vb2_ops gspca_qops = {
1386         .queue_setup            = gspca_queue_setup,
1387         .buf_prepare            = gspca_buffer_prepare,
1388         .buf_finish             = gspca_buffer_finish,
1389         .buf_queue              = gspca_buffer_queue,
1390         .start_streaming        = gspca_start_streaming,
1391         .stop_streaming         = gspca_stop_streaming,
1392         .wait_prepare           = vb2_ops_wait_prepare,
1393         .wait_finish            = vb2_ops_wait_finish,
1394 };
1395
1396 static const struct v4l2_file_operations dev_fops = {
1397         .owner = THIS_MODULE,
1398         .open = v4l2_fh_open,
1399         .release = vb2_fop_release,
1400         .unlocked_ioctl = video_ioctl2,
1401         .read = vb2_fop_read,
1402         .mmap = vb2_fop_mmap,
1403         .poll = vb2_fop_poll,
1404 };
1405
1406 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1407         .vidioc_querycap        = vidioc_querycap,
1408         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1409         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1410         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1411         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1412         .vidioc_enum_input      = vidioc_enum_input,
1413         .vidioc_g_input         = vidioc_g_input,
1414         .vidioc_s_input         = vidioc_s_input,
1415         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1416         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1417         .vidioc_g_parm          = vidioc_g_parm,
1418         .vidioc_s_parm          = vidioc_s_parm,
1419         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1420         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1421
1422         .vidioc_reqbufs         = vb2_ioctl_reqbufs,
1423         .vidioc_create_bufs     = vb2_ioctl_create_bufs,
1424         .vidioc_querybuf        = vb2_ioctl_querybuf,
1425         .vidioc_qbuf            = vb2_ioctl_qbuf,
1426         .vidioc_dqbuf           = vb2_ioctl_dqbuf,
1427         .vidioc_expbuf          = vb2_ioctl_expbuf,
1428         .vidioc_streamon        = vb2_ioctl_streamon,
1429         .vidioc_streamoff       = vb2_ioctl_streamoff,
1430
1431 #ifdef CONFIG_VIDEO_ADV_DEBUG
1432         .vidioc_g_chip_info     = vidioc_g_chip_info,
1433         .vidioc_g_register      = vidioc_g_register,
1434         .vidioc_s_register      = vidioc_s_register,
1435 #endif
1436         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1437         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1438 };
1439
1440 static const struct video_device gspca_template = {
1441         .name = "gspca main driver",
1442         .fops = &dev_fops,
1443         .ioctl_ops = &dev_ioctl_ops,
1444         .release = video_device_release_empty, /* We use v4l2_dev.release */
1445 };
1446
1447 /*
1448  * probe and create a new gspca device
1449  *
1450  * This function must be called by the sub-driver when it is
1451  * called for probing a new device.
1452  */
1453 int gspca_dev_probe2(struct usb_interface *intf,
1454                 const struct usb_device_id *id,
1455                 const struct sd_desc *sd_desc,
1456                 int dev_size,
1457                 struct module *module)
1458 {
1459         struct gspca_dev *gspca_dev;
1460         struct usb_device *dev = interface_to_usbdev(intf);
1461         struct vb2_queue *q;
1462         int ret;
1463
1464         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
1465                 sd_desc->name, id->idVendor, id->idProduct);
1466
1467         /* create the device */
1468         if (dev_size < sizeof *gspca_dev)
1469                 dev_size = sizeof *gspca_dev;
1470         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1471         if (!gspca_dev) {
1472                 pr_err("couldn't kzalloc gspca struct\n");
1473                 return -ENOMEM;
1474         }
1475         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1476         if (!gspca_dev->usb_buf) {
1477                 pr_err("out of memory\n");
1478                 ret = -ENOMEM;
1479                 goto out;
1480         }
1481         gspca_dev->dev = dev;
1482         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
1483         gspca_dev->xfer_ep = -1;
1484
1485         /* check if any audio device */
1486         if (dev->actconfig->desc.bNumInterfaces != 1) {
1487                 int i;
1488                 struct usb_interface *intf2;
1489
1490                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
1491                         intf2 = dev->actconfig->interface[i];
1492                         if (intf2 != NULL
1493                          && intf2->altsetting != NULL
1494                          && intf2->altsetting->desc.bInterfaceClass ==
1495                                          USB_CLASS_AUDIO) {
1496                                 gspca_dev->audio = 1;
1497                                 break;
1498                         }
1499                 }
1500         }
1501
1502         gspca_dev->v4l2_dev.release = gspca_release;
1503         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
1504         if (ret)
1505                 goto out;
1506         gspca_dev->present = true;
1507         gspca_dev->sd_desc = sd_desc;
1508         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1509         gspca_dev->vdev = gspca_template;
1510         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
1511         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
1512         gspca_dev->module = module;
1513
1514         mutex_init(&gspca_dev->usb_lock);
1515         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
1516         init_waitqueue_head(&gspca_dev->wq);
1517
1518         /* Initialize the vb2 queue */
1519         q = &gspca_dev->queue;
1520         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1521         q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
1522         q->drv_priv = gspca_dev;
1523         q->buf_struct_size = sizeof(struct gspca_buffer);
1524         q->ops = &gspca_qops;
1525         q->mem_ops = &vb2_vmalloc_memops;
1526         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1527         q->min_buffers_needed = 2;
1528         q->lock = &gspca_dev->usb_lock;
1529         ret = vb2_queue_init(q);
1530         if (ret)
1531                 goto out;
1532         gspca_dev->vdev.queue = q;
1533
1534         INIT_LIST_HEAD(&gspca_dev->buf_list);
1535         spin_lock_init(&gspca_dev->qlock);
1536
1537         /* configure the subdriver and initialize the USB device */
1538         ret = sd_desc->config(gspca_dev, id);
1539         if (ret < 0)
1540                 goto out;
1541         ret = sd_desc->init(gspca_dev);
1542         if (ret < 0)
1543                 goto out;
1544         if (sd_desc->init_controls)
1545                 ret = sd_desc->init_controls(gspca_dev);
1546         if (ret < 0)
1547                 goto out;
1548         gspca_set_default_mode(gspca_dev);
1549
1550         ret = gspca_input_connect(gspca_dev);
1551         if (ret)
1552                 goto out;
1553
1554 #ifdef CONFIG_VIDEO_ADV_DEBUG
1555         if (!gspca_dev->sd_desc->get_register)
1556                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
1557         if (!gspca_dev->sd_desc->set_register)
1558                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
1559 #endif
1560         if (!gspca_dev->sd_desc->get_jcomp)
1561                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
1562         if (!gspca_dev->sd_desc->set_jcomp)
1563                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
1564
1565         /* init video stuff */
1566         ret = video_register_device(&gspca_dev->vdev,
1567                                   VFL_TYPE_GRABBER,
1568                                   -1);
1569         if (ret < 0) {
1570                 pr_err("video_register_device err %d\n", ret);
1571                 goto out;
1572         }
1573
1574         usb_set_intfdata(intf, gspca_dev);
1575         gspca_dbg(gspca_dev, D_PROBE, "%s created\n",
1576                   video_device_node_name(&gspca_dev->vdev));
1577
1578         gspca_input_create_urb(gspca_dev);
1579
1580         return 0;
1581 out:
1582 #if IS_ENABLED(CONFIG_INPUT)
1583         if (gspca_dev->input_dev)
1584                 input_unregister_device(gspca_dev->input_dev);
1585 #endif
1586         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1587         kfree(gspca_dev->usb_buf);
1588         kfree(gspca_dev);
1589         return ret;
1590 }
1591 EXPORT_SYMBOL(gspca_dev_probe2);
1592
1593 /* same function as the previous one, but check the interface */
1594 int gspca_dev_probe(struct usb_interface *intf,
1595                 const struct usb_device_id *id,
1596                 const struct sd_desc *sd_desc,
1597                 int dev_size,
1598                 struct module *module)
1599 {
1600         struct usb_device *dev = interface_to_usbdev(intf);
1601
1602         /* we don't handle multi-config cameras */
1603         if (dev->descriptor.bNumConfigurations != 1) {
1604                 pr_err("%04x:%04x too many config\n",
1605                        id->idVendor, id->idProduct);
1606                 return -ENODEV;
1607         }
1608
1609         /* the USB video interface must be the first one */
1610         if (dev->actconfig->desc.bNumInterfaces != 1
1611          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
1612                 return -ENODEV;
1613
1614         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
1615 }
1616 EXPORT_SYMBOL(gspca_dev_probe);
1617
1618 /*
1619  * USB disconnection
1620  *
1621  * This function must be called by the sub-driver
1622  * when the device disconnects, after the specific resources are freed.
1623  */
1624 void gspca_disconnect(struct usb_interface *intf)
1625 {
1626         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1627 #if IS_ENABLED(CONFIG_INPUT)
1628         struct input_dev *input_dev;
1629 #endif
1630
1631         gspca_dbg(gspca_dev, D_PROBE, "%s disconnect\n",
1632                   video_device_node_name(&gspca_dev->vdev));
1633
1634         mutex_lock(&gspca_dev->usb_lock);
1635         gspca_dev->present = false;
1636         destroy_urbs(gspca_dev);
1637         gspca_input_destroy_urb(gspca_dev);
1638
1639         vb2_queue_error(&gspca_dev->queue);
1640
1641 #if IS_ENABLED(CONFIG_INPUT)
1642         input_dev = gspca_dev->input_dev;
1643         if (input_dev) {
1644                 gspca_dev->input_dev = NULL;
1645                 input_unregister_device(input_dev);
1646         }
1647 #endif
1648
1649         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
1650         video_unregister_device(&gspca_dev->vdev);
1651
1652         mutex_unlock(&gspca_dev->usb_lock);
1653
1654         /* (this will call gspca_release() immediately or on last close) */
1655         v4l2_device_put(&gspca_dev->v4l2_dev);
1656 }
1657 EXPORT_SYMBOL(gspca_disconnect);
1658
1659 #ifdef CONFIG_PM
1660 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1661 {
1662         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1663
1664         gspca_input_destroy_urb(gspca_dev);
1665
1666         if (!vb2_start_streaming_called(&gspca_dev->queue))
1667                 return 0;
1668
1669         mutex_lock(&gspca_dev->usb_lock);
1670         gspca_dev->frozen = 1;          /* avoid urb error messages */
1671         gspca_dev->usb_err = 0;
1672         if (gspca_dev->sd_desc->stopN)
1673                 gspca_dev->sd_desc->stopN(gspca_dev);
1674         destroy_urbs(gspca_dev);
1675         gspca_set_alt0(gspca_dev);
1676         if (gspca_dev->sd_desc->stop0)
1677                 gspca_dev->sd_desc->stop0(gspca_dev);
1678         mutex_unlock(&gspca_dev->usb_lock);
1679
1680         return 0;
1681 }
1682 EXPORT_SYMBOL(gspca_suspend);
1683
1684 int gspca_resume(struct usb_interface *intf)
1685 {
1686         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1687         int streaming, ret = 0;
1688
1689         mutex_lock(&gspca_dev->usb_lock);
1690         gspca_dev->frozen = 0;
1691         gspca_dev->usb_err = 0;
1692         gspca_dev->sd_desc->init(gspca_dev);
1693         /*
1694          * Most subdrivers send all ctrl values on sd_start and thus
1695          * only write to the device registers on s_ctrl when streaming ->
1696          * Clear streaming to avoid setting all ctrls twice.
1697          */
1698         streaming = vb2_start_streaming_called(&gspca_dev->queue);
1699         if (streaming)
1700                 ret = gspca_init_transfer(gspca_dev);
1701         else
1702                 gspca_input_create_urb(gspca_dev);
1703         mutex_unlock(&gspca_dev->usb_lock);
1704
1705         return ret;
1706 }
1707 EXPORT_SYMBOL(gspca_resume);
1708 #endif
1709
1710 /* -- module insert / remove -- */
1711 static int __init gspca_init(void)
1712 {
1713         pr_info("v" GSPCA_VERSION " registered\n");
1714         return 0;
1715 }
1716 static void __exit gspca_exit(void)
1717 {
1718 }
1719
1720 module_init(gspca_init);
1721 module_exit(gspca_exit);
1722
1723 module_param_named(debug, gspca_debug, int, 0644);
1724 MODULE_PARM_DESC(debug,
1725                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");