git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/usbvideo/quickcam_messenger.c

   1 /*
   2  * Driver for Logitech Quickcam Messenger usb video camera
   3  * Copyright (C) Jaya Kumar
   4  *
   5  * This work was sponsored by CIS(M) Sdn Bhd.
   6  * History:
   7  * 05/08/2006 - Jaya Kumar
   8  * I wrote this based on the konicawc by Simon Evans.
   9  * -
  10  * Full credit for reverse engineering and creating an initial
  11  * working linux driver for the VV6422 goes to the qce-ga project by
  12  * Tuukka Toivonen, Jochen Hoenicke, Peter McConnell,
  13  * Cristiano De Michele, Georg Acher, Jean-Frederic Clere as well as
  14  * others.
  15  * ---
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  29  *
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/input.h>
  36 #include <linux/usb/input.h>
  37
  38 #include "usbvideo.h"
  39 #include "quickcam_messenger.h"
  40
  41 /*
  42  * Version Information
  43  */
  44
  45 #ifdef CONFIG_USB_DEBUG
  46 static int debug;
  47 #define DEBUG(n, format, arg...) \
  48         if (n <= debug) {        \
  49                 printk(KERN_DEBUG __FILE__ ":%s(): " format "\n", __FUNCTION__ , ## arg); \
  50         }
  51 #else
  52 #define DEBUG(n, arg...)
  53 static const int debug = 0;
  54 #endif
  55
  56 #define DRIVER_VERSION "v0.01"
  57 #define DRIVER_DESC "Logitech Quickcam Messenger USB"
  58
  59 #define USB_LOGITECH_VENDOR_ID  0x046D
  60 #define USB_QCM_PRODUCT_ID      0x08F0
  61
  62 #define MAX_CAMERAS     1
  63
  64 #define MAX_COLOUR      32768
  65 #define MAX_HUE         32768
  66 #define MAX_BRIGHTNESS  32768
  67 #define MAX_CONTRAST    32768
  68 #define MAX_WHITENESS   32768
  69
  70 static int size = SIZE_320X240;
  71 static int colour = MAX_COLOUR;
  72 static int hue = MAX_HUE;
  73 static int brightness = MAX_BRIGHTNESS;
  74 static int contrast =   MAX_CONTRAST;
  75 static int whiteness =  MAX_WHITENESS;
  76
  77 static struct usbvideo *cams;
  78
  79 static struct usb_device_id qcm_table [] = {
  80         { USB_DEVICE(USB_LOGITECH_VENDOR_ID, USB_QCM_PRODUCT_ID) },
  81         { }
  82 };
  83 MODULE_DEVICE_TABLE(usb, qcm_table);
  84
  85 #ifdef CONFIG_INPUT
  86 static void qcm_register_input(struct qcm *cam, struct usb_device *dev)
  87 {
  88         struct input_dev *input_dev;
  89         int error;
  90
  91         usb_make_path(dev, cam->input_physname, sizeof(cam->input_physname));
  92         strncat(cam->input_physname, "/input0", sizeof(cam->input_physname));
  93
  94         cam->input = input_dev = input_allocate_device();
  95         if (!input_dev) {
  96                 warn("insufficient mem for cam input device");
  97                 return;
  98         }
  99
 100         input_dev->name = "QCM button";
 101         input_dev->phys = cam->input_physname;
 102         usb_to_input_id(dev, &input_dev->id);
 103         input_dev->dev.parent = &dev->dev;
 104
 105         input_dev->evbit[0] = BIT_MASK(EV_KEY);
 106         input_dev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);
 107
 108         input_dev->private = cam;
 109
 110         error = input_register_device(cam->input);
 111         if (error) {
 112                 warn("Failed to register camera's input device, err: %d\n",
 113                      error);
 114                 input_free_device(cam->input);
 115                 cam->input = NULL;
 116         }
 117 }
 118
 119 static void qcm_unregister_input(struct qcm *cam)
 120 {
 121         if (cam->input) {
 122                 input_unregister_device(cam->input);
 123                 cam->input = NULL;
 124         }
 125 }
 126
 127 static void qcm_report_buttonstat(struct qcm *cam)
 128 {
 129         if (cam->input) {
 130                 input_report_key(cam->input, BTN_0, cam->button_sts);
 131                 input_sync(cam->input);
 132         }
 133 }
 134
 135 static void qcm_int_irq(struct urb *urb)
 136 {
 137         int ret;
 138         struct uvd *uvd = urb->context;
 139         struct qcm *cam;
 140
 141         if (!CAMERA_IS_OPERATIONAL(uvd))
 142                 return;
 143
 144         if (!uvd->streaming)
 145                 return;
 146
 147         uvd->stats.urb_count++;
 148
 149         if (urb->status < 0)
 150                 uvd->stats.iso_err_count++;
 151         else {
 152                 if (urb->actual_length > 0 ) {
 153                         cam = (struct qcm *) uvd->user_data;
 154                         if (cam->button_sts_buf == 0x88)
 155                                 cam->button_sts = 0x0;
 156                         else if (cam->button_sts_buf == 0x80)
 157                                 cam->button_sts = 0x1;
 158                         qcm_report_buttonstat(cam);
 159                 }
 160         }
 161
 162         ret = usb_submit_urb(urb, GFP_ATOMIC);
 163         if (ret < 0)
 164                 err("usb_submit_urb error (%d)", ret);
 165 }
 166
 167 static int qcm_setup_input_int(struct qcm *cam, struct uvd *uvd)
 168 {
 169         int errflag;
 170         usb_fill_int_urb(cam->button_urb, uvd->dev,
 171                         usb_rcvintpipe(uvd->dev, uvd->video_endp + 1),
 172                         &cam->button_sts_buf,
 173                         1,
 174                         qcm_int_irq,
 175                         uvd, 16);
 176
 177         errflag = usb_submit_urb(cam->button_urb, GFP_KERNEL);
 178         if (errflag)
 179                 err ("usb_submit_int ret %d", errflag);
 180         return errflag;
 181 }
 182
 183 static void qcm_stop_int_data(struct qcm *cam)
 184 {
 185         usb_kill_urb(cam->button_urb);
 186 }
 187
 188 static int qcm_alloc_int_urb(struct qcm *cam)
 189 {
 190         cam->button_urb = usb_alloc_urb(0, GFP_KERNEL);
 191
 192         if (!cam->button_urb)
 193                 return -ENOMEM;
 194
 195         return 0;
 196 }
 197
 198 static void qcm_free_int(struct qcm *cam)
 199 {
 200         usb_free_urb(cam->button_urb);
 201 }
 202 #endif /* CONFIG_INPUT */
 203
 204 static int qcm_stv_setb(struct usb_device *dev, u16 reg, u8 val)
 205 {
 206         int ret;
 207
 208         /* we'll wait up to 3 slices but no more */
 209         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 210                 0x04, USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 211                 reg, 0, &val, 1, 3*HZ);
 212         return ret;
 213 }
 214
 215 static int qcm_stv_setw(struct usb_device *dev, u16 reg, u16 val)
 216 {
 217         int ret;
 218
 219         /* we'll wait up to 3 slices but no more */
 220         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 221                 0x04, USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 222                 reg, 0, &val, 2, 3*HZ);
 223         return ret;
 224 }
 225
 226 static int qcm_stv_getw(struct usb_device *dev, unsigned short reg,
 227                                                         __le16 *val)
 228 {
 229         int ret;
 230
 231         /* we'll wait up to 3 slices but no more */
 232         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 233                 0x04, USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 234                 reg, 0, val, 2, 3*HZ);
 235         return ret;
 236 }
 237
 238 static int qcm_camera_on(struct uvd *uvd)
 239 {
 240         int ret;
 241         CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x01));
 242         return 0;
 243 }
 244
 245 static int qcm_camera_off(struct uvd *uvd)
 246 {
 247         int ret;
 248         CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x00));
 249         return 0;
 250 }
 251
 252 static void qcm_hsv2rgb(u16 hue, u16 sat, u16 val, u16 *r, u16 *g, u16 *b)
 253 {
 254         unsigned int segment, valsat;
 255         signed int   h = (signed int) hue;
 256         unsigned int s = (sat - 32768) * 2;     /* rescale */
 257         unsigned int v = val;
 258         unsigned int p;
 259
 260         /*
 261         the registers controling gain are 8 bit of which
 262         we affect only the last 4 bits with our gain.
 263         we know that if saturation is 0, (unsaturated) then
 264         we're grayscale (center axis of the colour cone) so
 265         we set rgb=value. we use a formula obtained from
 266         wikipedia to map the cone to the RGB plane. it's
 267         as follows for the human value case of h=0..360,
 268         s=0..1, v=0..1
 269         h_i = h/60 % 6 , f = h/60 - h_i , p = v(1-s)
 270         q = v(1 - f*s) , t = v(1 - (1-f)s)
 271         h_i==0 => r=v , g=t, b=p
 272         h_i==1 => r=q , g=v, b=p
 273         h_i==2 => r=p , g=v, b=t
 274         h_i==3 => r=p , g=q, b=v
 275         h_i==4 => r=t , g=p, b=v
 276         h_i==5 => r=v , g=p, b=q
 277         the bottom side (the point) and the stuff just up
 278         of that is black so we simplify those two cases.
 279         */
 280         if (sat < 32768) {
 281                 /* anything less than this is unsaturated */
 282                 *r = val;
 283                 *g = val;
 284                 *b = val;
 285                 return;
 286         }
 287         if (val <= (0xFFFF/8)) {
 288                 /* anything less than this is black */
 289                 *r = 0;
 290                 *g = 0;
 291                 *b = 0;
 292                 return;
 293         }
 294
 295         /* the rest of this code is copying tukkat's
 296         implementation of the hsv2rgb conversion as taken
 297         from qc-usb-messenger code. the 10923 is 0xFFFF/6
 298         to divide the cone into 6 sectors.  */
 299
 300         segment = (h + 10923) & 0xFFFF;
 301         segment = segment*3 >> 16;              /* 0..2: 0=R, 1=G, 2=B */
 302         hue -= segment * 21845;                 /* -10923..10923 */
 303         h = hue;
 304         h *= 3;
 305         valsat = v*s >> 16;                     /* 0..65534 */
 306         p = v - valsat;
 307         if (h >= 0) {
 308                 unsigned int t = v - (valsat * (32769 - h) >> 15);
 309                 switch (segment) {
 310                 case 0: /* R-> */
 311                         *r = v;
 312                         *g = t;
 313                         *b = p;
 314                         break;
 315                 case 1: /* G-> */
 316                         *r = p;
 317                         *g = v;
 318                         *b = t;
 319                         break;
 320                 case 2: /* B-> */
 321                         *r = t;
 322                         *g = p;
 323                         *b = v;
 324                         break;
 325                 }
 326         } else {
 327                 unsigned int q = v - (valsat * (32769 + h) >> 15);
 328                 switch (segment) {
 329                 case 0: /* ->R */
 330                         *r = v;
 331                         *g = p;
 332                         *b = q;
 333                         break;
 334                 case 1: /* ->G */
 335                         *r = q;
 336                         *g = v;
 337                         *b = p;
 338                         break;
 339                 case 2: /* ->B */
 340                         *r = p;
 341                         *g = q;
 342                         *b = v;
 343                         break;
 344                 }
 345         }
 346 }
 347
 348 static int qcm_sensor_set_gains(struct uvd *uvd, u16 hue,
 349         u16 saturation, u16 value)
 350 {
 351         int ret;
 352         u16 r=0,g=0,b=0;
 353
 354         /* this code is based on qc-usb-messenger */
 355         qcm_hsv2rgb(hue, saturation, value, &r, &g, &b);
 356
 357         r >>= 12;
 358         g >>= 12;
 359         b >>= 12;
 360
 361         /* min val is 8 */
 362         r = max((u16) 8, r);
 363         g = max((u16) 8, g);
 364         b = max((u16) 8, b);
 365
 366         r |= 0x30;
 367         g |= 0x30;
 368         b |= 0x30;
 369
 370         /* set the r,g,b gain registers */
 371         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x0509, r));
 372         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050A, g));
 373         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050B, b));
 374
 375         /* doing as qc-usb did */
 376         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050C, 0x2A));
 377         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050D, 0x01));
 378         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
 379
 380         return 0;
 381 }
 382
 383 static int qcm_sensor_set_exposure(struct uvd *uvd, int exposure)
 384 {
 385         int ret;
 386         int formedval;
 387
 388         /* calculation was from qc-usb-messenger driver */
 389         formedval = ( exposure >> 12 );
 390
 391         /* max value for formedval is 14 */
 392         formedval = min(formedval, 14);
 393
 394         CHECK_RET(ret, qcm_stv_setb(uvd->dev,
 395                         0x143A, 0xF0 | formedval));
 396         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
 397         return 0;
 398 }
 399
 400 static int qcm_sensor_setlevels(struct uvd *uvd, int brightness, int contrast,
 401                                         int hue, int colour)
 402 {
 403         int ret;
 404         /* brightness is exposure, contrast is gain, colour is saturation */
 405         CHECK_RET(ret,
 406                 qcm_sensor_set_exposure(uvd, brightness));
 407         CHECK_RET(ret, qcm_sensor_set_gains(uvd, hue, colour, contrast));
 408
 409         return 0;
 410 }
 411
 412 static int qcm_sensor_setsize(struct uvd *uvd, u8 size)
 413 {
 414         int ret;
 415
 416         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x1505, size));
 417         return 0;
 418 }
 419
 420 static int qcm_sensor_set_shutter(struct uvd *uvd, int whiteness)
 421 {
 422         int ret;
 423         /* some rescaling as done by the qc-usb-messenger code */
 424         if (whiteness > 0xC000)
 425                 whiteness = 0xC000 + (whiteness & 0x3FFF)*8;
 426
 427         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143D,
 428                                 (whiteness >> 8) & 0xFF));
 429         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143E,
 430                                 (whiteness >> 16) & 0x03));
 431         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
 432
 433         return 0;
 434 }
 435
 436 static int qcm_sensor_init(struct uvd *uvd)
 437 {
 438         struct qcm *cam = (struct qcm *) uvd->user_data;
 439         int ret;
 440         int i;
 441
 442         for (i=0; i < ARRAY_SIZE(regval_table) ; i++) {
 443                 CHECK_RET(ret, qcm_stv_setb(uvd->dev,
 444                                         regval_table[i].reg,
 445                                         regval_table[i].val));
 446         }
 447
 448         CHECK_RET(ret, qcm_stv_setw(uvd->dev, 0x15c1,
 449                                 cpu_to_le16(ISOC_PACKET_SIZE)));
 450         CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x15c3, 0x08));
 451         CHECK_RET(ret, ret = qcm_stv_setb(uvd->dev, 0x143f, 0x01));
 452
 453         CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x00));
 454
 455         CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
 456
 457         CHECK_RET(ret, qcm_sensor_setlevels(uvd, uvd->vpic.brightness,
 458                         uvd->vpic.contrast, uvd->vpic.hue, uvd->vpic.colour));
 459
 460         CHECK_RET(ret, qcm_sensor_set_shutter(uvd, uvd->vpic.whiteness));
 461         CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
 462
 463         return 0;
 464 }
 465
 466 static int qcm_set_camera_size(struct uvd *uvd)
 467 {
 468         int ret;
 469         struct qcm *cam = (struct qcm *) uvd->user_data;
 470
 471         CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
 472         cam->width = camera_sizes[cam->size].width;
 473         cam->height = camera_sizes[cam->size].height;
 474         uvd->videosize = VIDEOSIZE(cam->width, cam->height);
 475
 476         return 0;
 477 }
 478
 479 static int qcm_setup_on_open(struct uvd *uvd)
 480 {
 481         int ret;
 482
 483         CHECK_RET(ret, qcm_sensor_set_gains(uvd, uvd->vpic.hue,
 484                                 uvd->vpic.colour, uvd->vpic.contrast));
 485         CHECK_RET(ret, qcm_sensor_set_exposure(uvd, uvd->vpic.brightness));
 486         CHECK_RET(ret, qcm_sensor_set_shutter(uvd, uvd->vpic.whiteness));
 487         CHECK_RET(ret, qcm_set_camera_size(uvd));
 488         CHECK_RET(ret, qcm_camera_on(uvd));
 489         return 0;
 490 }
 491
 492 static void qcm_adjust_picture(struct uvd *uvd)
 493 {
 494         int ret;
 495         struct qcm *cam = (struct qcm *) uvd->user_data;
 496
 497         ret = qcm_camera_off(uvd);
 498         if (ret) {
 499                 err("can't turn camera off. abandoning pic adjustment");
 500                 return;
 501         }
 502
 503         /* if there's been a change in contrast, hue, or
 504         colour then we need to recalculate hsv in order
 505         to update gains */
 506         if ((cam->contrast != uvd->vpic.contrast) ||
 507                 (cam->hue != uvd->vpic.hue) ||
 508                 (cam->colour != uvd->vpic.colour)) {
 509                 cam->contrast = uvd->vpic.contrast;
 510                 cam->hue = uvd->vpic.hue;
 511                 cam->colour = uvd->vpic.colour;
 512                 ret = qcm_sensor_set_gains(uvd, cam->hue, cam->colour,
 513                                                 cam->contrast);
 514                 if (ret) {
 515                         err("can't set gains. abandoning pic adjustment");
 516                         return;
 517                 }
 518         }
 519
 520         if (cam->brightness != uvd->vpic.brightness) {
 521                 cam->brightness = uvd->vpic.brightness;
 522                 ret = qcm_sensor_set_exposure(uvd, cam->brightness);
 523                 if (ret) {
 524                         err("can't set exposure. abandoning pic adjustment");
 525                         return;
 526                 }
 527         }
 528
 529         if (cam->whiteness != uvd->vpic.whiteness) {
 530                 cam->whiteness = uvd->vpic.whiteness;
 531                 qcm_sensor_set_shutter(uvd, cam->whiteness);
 532                 if (ret) {
 533                         err("can't set shutter. abandoning pic adjustment");
 534                         return;
 535                 }
 536         }
 537
 538         ret = qcm_camera_on(uvd);
 539         if (ret) {
 540                 err("can't reenable camera. pic adjustment failed");
 541                 return;
 542         }
 543 }
 544
 545 static int qcm_process_frame(struct uvd *uvd, u8 *cdata, int framelen)
 546 {
 547         int datalen;
 548         int totaldata;
 549         struct framehdr {
 550                 __be16 id;
 551                 __be16 len;
 552         };
 553         struct framehdr *fhdr;
 554
 555         totaldata = 0;
 556         while (framelen) {
 557                 fhdr = (struct framehdr *) cdata;
 558                 datalen = be16_to_cpu(fhdr->len);
 559                 framelen -= 4;
 560                 cdata += 4;
 561
 562                 if ((fhdr->id) == cpu_to_be16(0x8001)) {
 563                         RingQueue_Enqueue(&uvd->dp, marker, 4);
 564                         totaldata += 4;
 565                         continue;
 566                 }
 567                 if ((fhdr->id & cpu_to_be16(0xFF00)) == cpu_to_be16(0x0200)) {
 568                         RingQueue_Enqueue(&uvd->dp, cdata, datalen);
 569                         totaldata += datalen;
 570                 }
 571                 framelen -= datalen;
 572                 cdata += datalen;
 573         }
 574         return totaldata;
 575 }
 576
 577 static int qcm_compress_iso(struct uvd *uvd, struct urb *dataurb)
 578 {
 579         int totlen;
 580         int i;
 581         unsigned char *cdata;
 582
 583         totlen=0;
 584         for (i = 0; i < dataurb->number_of_packets; i++) {
 585                 int n = dataurb->iso_frame_desc[i].actual_length;
 586                 int st = dataurb->iso_frame_desc[i].status;
 587
 588                 cdata = dataurb->transfer_buffer +
 589                         dataurb->iso_frame_desc[i].offset;
 590
 591                 if (st < 0) {
 592                         warn("Data error: packet=%d. len=%d. status=%d.",
 593                               i, n, st);
 594                         uvd->stats.iso_err_count++;
 595                         continue;
 596                 }
 597                 if (!n)
 598                         continue;
 599
 600                 totlen += qcm_process_frame(uvd, cdata, n);
 601         }
 602         return totlen;
 603 }
 604
 605 static void resubmit_urb(struct uvd *uvd, struct urb *urb)
 606 {
 607         int ret;
 608
 609         urb->dev = uvd->dev;
 610         ret = usb_submit_urb(urb, GFP_ATOMIC);
 611         if (ret)
 612                 err("usb_submit_urb error (%d)", ret);
 613 }
 614
 615 static void qcm_isoc_irq(struct urb *urb)
 616 {
 617         int len;
 618         struct uvd *uvd = urb->context;
 619
 620         if (!CAMERA_IS_OPERATIONAL(uvd))
 621                 return;
 622
 623         if (!uvd->streaming)
 624                 return;
 625
 626         uvd->stats.urb_count++;
 627
 628         if (!urb->actual_length) {
 629                 resubmit_urb(uvd, urb);
 630                 return;
 631         }
 632
 633         len = qcm_compress_iso(uvd, urb);
 634         resubmit_urb(uvd, urb);
 635         uvd->stats.urb_length = len;
 636         uvd->stats.data_count += len;
 637         if (len)
 638                 RingQueue_WakeUpInterruptible(&uvd->dp);
 639 }
 640
 641 static int qcm_start_data(struct uvd *uvd)
 642 {
 643         struct qcm *cam = (struct qcm *) uvd->user_data;
 644         int i;
 645         int errflag;
 646         int pktsz;
 647         int err;
 648
 649         pktsz = uvd->iso_packet_len;
 650         if (!CAMERA_IS_OPERATIONAL(uvd)) {
 651                 err("Camera is not operational");
 652                 return -EFAULT;
 653         }
 654
 655         err = usb_set_interface(uvd->dev, uvd->iface, uvd->ifaceAltActive);
 656         if (err < 0) {
 657                 err("usb_set_interface error");
 658                 uvd->last_error = err;
 659                 return -EBUSY;
 660         }
 661
 662         for (i=0; i < USBVIDEO_NUMSBUF; i++) {
 663                 int j, k;
 664                 struct urb *urb = uvd->sbuf[i].urb;
 665                 urb->dev = uvd->dev;
 666                 urb->context = uvd;
 667                 urb->pipe = usb_rcvisocpipe(uvd->dev, uvd->video_endp);
 668                 urb->interval = 1;
 669                 urb->transfer_flags = URB_ISO_ASAP;
 670                 urb->transfer_buffer = uvd->sbuf[i].data;
 671                 urb->complete = qcm_isoc_irq;
 672                 urb->number_of_packets = FRAMES_PER_DESC;
 673                 urb->transfer_buffer_length = pktsz * FRAMES_PER_DESC;
 674                 for (j=k=0; j < FRAMES_PER_DESC; j++, k += pktsz) {
 675                         urb->iso_frame_desc[j].offset = k;
 676                         urb->iso_frame_desc[j].length = pktsz;
 677                 }
 678         }
 679
 680         uvd->streaming = 1;
 681         uvd->curframe = -1;
 682         for (i=0; i < USBVIDEO_NUMSBUF; i++) {
 683                 errflag = usb_submit_urb(uvd->sbuf[i].urb, GFP_KERNEL);
 684                 if (errflag)
 685                         err ("usb_submit_isoc(%d) ret %d", i, errflag);
 686         }
 687
 688         CHECK_RET(err, qcm_setup_input_int(cam, uvd));
 689         CHECK_RET(err, qcm_camera_on(uvd));
 690         return 0;
 691 }
 692
 693 static void qcm_stop_data(struct uvd *uvd)
 694 {
 695         struct qcm *cam = (struct qcm *) uvd->user_data;
 696         int i, j;
 697         int ret;
 698
 699         if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
 700                 return;
 701
 702         ret = qcm_camera_off(uvd);
 703         if (ret)
 704                 warn("couldn't turn the cam off.");
 705
 706         uvd->streaming = 0;
 707
 708         /* Unschedule all of the iso td's */
 709         for (i=0; i < USBVIDEO_NUMSBUF; i++)
 710                 usb_kill_urb(uvd->sbuf[i].urb);
 711
 712         qcm_stop_int_data(cam);
 713
 714         if (!uvd->remove_pending) {
 715                 /* Set packet size to 0 */
 716                 j = usb_set_interface(uvd->dev, uvd->iface,
 717                                         uvd->ifaceAltInactive);
 718                 if (j < 0) {
 719                         err("usb_set_interface() error %d.", j);
 720                         uvd->last_error = j;
 721                 }
 722         }
 723 }
 724
 725 static void qcm_process_isoc(struct uvd *uvd, struct usbvideo_frame *frame)
 726 {
 727         struct qcm *cam = (struct qcm *) uvd->user_data;
 728         int x;
 729         struct rgb *rgbL0;
 730         struct rgb *rgbL1;
 731         struct bayL0 *bayL0;
 732         struct bayL1 *bayL1;
 733         int hor,ver,hordel,verdel;
 734         assert(frame != NULL);
 735
 736         switch (cam->size) {
 737         case SIZE_160X120:
 738                 hor = 162; ver = 124; hordel = 1; verdel = 2;
 739                 break;
 740         case SIZE_320X240:
 741         default:
 742                 hor = 324; ver = 248; hordel = 2; verdel = 4;
 743                 break;
 744         }
 745
 746         if (frame->scanstate == ScanState_Scanning) {
 747                 while (RingQueue_GetLength(&uvd->dp) >=
 748                          4 + (hor*verdel + hordel)) {
 749                         if ((RING_QUEUE_PEEK(&uvd->dp, 0) == 0x00) &&
 750                             (RING_QUEUE_PEEK(&uvd->dp, 1) == 0xff) &&
 751                             (RING_QUEUE_PEEK(&uvd->dp, 2) == 0x00) &&
 752                             (RING_QUEUE_PEEK(&uvd->dp, 3) == 0xff)) {
 753                                 frame->curline = 0;
 754                                 frame->scanstate = ScanState_Lines;
 755                                 frame->frameState = FrameState_Grabbing;
 756                                 RING_QUEUE_DEQUEUE_BYTES(&uvd->dp, 4);
 757                         /*
 758                         * if we're starting, we need to discard the first
 759                         * 4 lines of y bayer data
 760                         * and the first 2 gr elements of x bayer data
 761                         */
 762                                 RING_QUEUE_DEQUEUE_BYTES(&uvd->dp,
 763                                                         (hor*verdel + hordel));
 764                                 break;
 765                         }
 766                         RING_QUEUE_DEQUEUE_BYTES(&uvd->dp, 1);
 767                 }
 768         }
 769
 770         if (frame->scanstate == ScanState_Scanning)
 771                 return;
 772
 773         /* now we can start processing bayer data so long as we have at least
 774         * 2 lines worth of data. this is the simplest demosaicing method that
 775         * I could think of. I use each 2x2 bayer element without interpolation
 776         * to generate 4 rgb pixels.
 777         */
 778         while ( frame->curline < cam->height &&
 779                 (RingQueue_GetLength(&uvd->dp) >= hor*2)) {
 780                 /* get 2 lines of bayer for demosaicing
 781                  * into 2 lines of RGB */
 782                 RingQueue_Dequeue(&uvd->dp, cam->scratch, hor*2);
 783                 bayL0 = (struct bayL0 *) cam->scratch;
 784                 bayL1 = (struct bayL1 *) (cam->scratch + hor);
 785                 /* frame->curline is the rgb y line */
 786                 rgbL0 = (struct rgb *)
 787                                 ( frame->data + (cam->width*3*frame->curline));
 788                 /* w/2 because we're already doing 2 pixels */
 789                 rgbL1 = rgbL0 + (cam->width/2);
 790
 791                 for (x=0; x < cam->width; x+=2) {
 792                         rgbL0->r = bayL0->r;
 793                         rgbL0->g = bayL0->g;
 794                         rgbL0->b = bayL1->b;
 795
 796                         rgbL0->r2 = bayL0->r;
 797                         rgbL0->g2 = bayL1->g;
 798                         rgbL0->b2 = bayL1->b;
 799
 800                         rgbL1->r = bayL0->r;
 801                         rgbL1->g = bayL1->g;
 802                         rgbL1->b = bayL1->b;
 803
 804                         rgbL1->r2 = bayL0->r;
 805                         rgbL1->g2 = bayL1->g;
 806                         rgbL1->b2 = bayL1->b;
 807
 808                         rgbL0++;
 809                         rgbL1++;
 810
 811                         bayL0++;
 812                         bayL1++;
 813                 }
 814
 815                 frame->seqRead_Length += cam->width*3*2;
 816                 frame->curline += 2;
 817         }
 818         /* See if we filled the frame */
 819         if (frame->curline == cam->height) {
 820                 frame->frameState = FrameState_Done_Hold;
 821                 frame->curline = 0;
 822                 uvd->curframe = -1;
 823                 uvd->stats.frame_num++;
 824         }
 825 }
 826
 827 /* taken from konicawc */
 828 static int qcm_set_video_mode(struct uvd *uvd, struct video_window *vw)
 829 {
 830         int ret;
 831         int newsize;
 832         int oldsize;
 833         int x = vw->width;
 834         int y = vw->height;
 835         struct qcm *cam = (struct qcm *) uvd->user_data;
 836
 837         if (x > 0 && y > 0) {
 838                 DEBUG(2, "trying to find size %d,%d", x, y);
 839                 for (newsize = 0; newsize <= MAX_FRAME_SIZE; newsize++) {
 840                         if ((camera_sizes[newsize].width == x) &&
 841                                 (camera_sizes[newsize].height == y))
 842                                 break;
 843                 }
 844         } else
 845                 newsize = cam->size;
 846
 847         if (newsize > MAX_FRAME_SIZE) {
 848                 DEBUG(1, "couldn't find size %d,%d", x, y);
 849                 return -EINVAL;
 850         }
 851
 852         if (newsize == cam->size) {
 853                 DEBUG(1, "Nothing to do");
 854                 return 0;
 855         }
 856
 857         qcm_stop_data(uvd);
 858
 859         if (cam->size != newsize) {
 860                 oldsize = cam->size;
 861                 cam->size = newsize;
 862                 ret = qcm_set_camera_size(uvd);
 863                 if (ret) {
 864                         err("Couldn't set camera size, err=%d",ret);
 865                         /* restore the original size */
 866                         cam->size = oldsize;
 867                         return ret;
 868                 }
 869         }
 870
 871         /* Flush the input queue and clear any current frame in progress */
 872
 873         RingQueue_Flush(&uvd->dp);
 874         if (uvd->curframe != -1) {
 875                 uvd->frame[uvd->curframe].curline = 0;
 876                 uvd->frame[uvd->curframe].seqRead_Length = 0;
 877                 uvd->frame[uvd->curframe].seqRead_Index = 0;
 878         }
 879
 880         CHECK_RET(ret, qcm_start_data(uvd));
 881         return 0;
 882 }
 883
 884 static int qcm_configure_video(struct uvd *uvd)
 885 {
 886         int ret;
 887         memset(&uvd->vpic, 0, sizeof(uvd->vpic));
 888         memset(&uvd->vpic_old, 0x55, sizeof(uvd->vpic_old));
 889
 890         uvd->vpic.colour = colour;
 891         uvd->vpic.hue = hue;
 892         uvd->vpic.brightness = brightness;
 893         uvd->vpic.contrast = contrast;
 894         uvd->vpic.whiteness = whiteness;
 895         uvd->vpic.depth = 24;
 896         uvd->vpic.palette = VIDEO_PALETTE_RGB24;
 897
 898         memset(&uvd->vcap, 0, sizeof(uvd->vcap));
 899         strcpy(uvd->vcap.name, "QCM USB Camera");
 900         uvd->vcap.type = VID_TYPE_CAPTURE;
 901         uvd->vcap.channels = 1;
 902         uvd->vcap.audios = 0;
 903
 904         uvd->vcap.minwidth = camera_sizes[SIZE_160X120].width;
 905         uvd->vcap.minheight = camera_sizes[SIZE_160X120].height;
 906         uvd->vcap.maxwidth = camera_sizes[SIZE_320X240].width;
 907         uvd->vcap.maxheight = camera_sizes[SIZE_320X240].height;
 908
 909         memset(&uvd->vchan, 0, sizeof(uvd->vchan));
 910         uvd->vchan.flags = 0 ;
 911         uvd->vchan.tuners = 0;
 912         uvd->vchan.channel = 0;
 913         uvd->vchan.type = VIDEO_TYPE_CAMERA;
 914         strcpy(uvd->vchan.name, "Camera");
 915
 916         CHECK_RET(ret, qcm_sensor_init(uvd));
 917         return 0;
 918 }
 919
 920 static int qcm_probe(struct usb_interface *intf,
 921                         const struct usb_device_id *devid)
 922 {
 923         int err;
 924         struct uvd *uvd;
 925         struct usb_device *dev = interface_to_usbdev(intf);
 926         struct qcm *cam;
 927         size_t buffer_size;
 928         unsigned char video_ep;
 929         struct usb_host_interface *interface;
 930         struct usb_endpoint_descriptor *endpoint;
 931         int i,j;
 932         unsigned int ifacenum, ifacenum_inact=0;
 933         __le16 sensor_id;
 934
 935         /* we don't support multiconfig cams */
 936         if (dev->descriptor.bNumConfigurations != 1)
 937                 return -ENODEV;
 938
 939         /* first check for the video interface and not
 940         * the audio interface */
 941         interface = &intf->cur_altsetting[0];
 942         if ((interface->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
 943                 || (interface->desc.bInterfaceSubClass !=
 944                         USB_CLASS_VENDOR_SPEC))
 945                 return -ENODEV;
 946
 947         /*
 948         walk through each endpoint in each setting in the interface
 949         stop when we find the one that's an isochronous IN endpoint.
 950         */
 951         for (i=0; i < intf->num_altsetting; i++) {
 952                 interface = &intf->cur_altsetting[i];
 953                 ifacenum = interface->desc.bAlternateSetting;
 954                 /* walk the end points */
 955                 for (j=0; j < interface->desc.bNumEndpoints; j++) {
 956                         endpoint = &interface->endpoint[j].desc;
 957
 958                         if ((endpoint->bEndpointAddress &
 959                                 USB_ENDPOINT_DIR_MASK) != USB_DIR_IN)
 960                                 continue; /* not input then not good */
 961
 962                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 963                         if (!buffer_size) {
 964                                 ifacenum_inact = ifacenum;
 965                                 continue; /* 0 pkt size is not what we want */
 966                         }
 967
 968                         if ((endpoint->bmAttributes &
 969                                 USB_ENDPOINT_XFERTYPE_MASK) ==
 970                                 USB_ENDPOINT_XFER_ISOC) {
 971                                 video_ep = endpoint->bEndpointAddress;
 972                                 /* break out of the search */
 973                                 goto good_videoep;
 974                         }
 975                 }
 976         }
 977         /* failed out since nothing useful was found */
 978         err("No suitable endpoint was found\n");
 979         return -ENODEV;
 980
 981 good_videoep:
 982         /* disable isochronous stream before doing anything else */
 983         err = qcm_stv_setb(dev, STV_ISO_ENABLE, 0);
 984         if (err < 0) {
 985                 err("Failed to disable sensor stream");
 986                 return -EIO;
 987         }
 988
 989         /*
 990         Check that this is the same unknown sensor that is known to work. This
 991         sensor is suspected to be the ST VV6422C001. I'll check the same value
 992         that the qc-usb driver checks. This value is probably not even the
 993         sensor ID since it matches the USB dev ID. Oh well. If it doesn't
 994         match, it's probably a diff sensor so exit and apologize.
 995         */
 996         err = qcm_stv_getw(dev, CMOS_SENSOR_IDREV, &sensor_id);
 997         if (err < 0) {
 998                 err("Couldn't read sensor values. Err %d\n",err);
 999                 return err;
1000         }
1001         if (sensor_id != cpu_to_le16(0x08F0)) {
1002                 err("Sensor ID %x != %x. Unsupported. Sorry\n",
1003                         le16_to_cpu(sensor_id), (0x08F0));
1004                 return -ENODEV;
1005         }
1006
1007         uvd = usbvideo_AllocateDevice(cams);
1008         if (!uvd)
1009                 return -ENOMEM;
1010
1011         cam = (struct qcm *) uvd->user_data;
1012
1013         /* buf for doing demosaicing */
1014         cam->scratch = kmalloc(324*2, GFP_KERNEL);
1015         if (!cam->scratch) /* uvd freed in dereg */
1016                 return -ENOMEM;
1017
1018         /* yes, if we fail after here, cam->scratch gets freed
1019         by qcm_free_uvd */
1020
1021         err = qcm_alloc_int_urb(cam);
1022         if (err < 0)
1023                 return err;
1024
1025         /* yes, if we fail after here, int urb gets freed
1026         by qcm_free_uvd */
1027
1028         RESTRICT_TO_RANGE(size, SIZE_160X120, SIZE_320X240);
1029         cam->width = camera_sizes[size].width;
1030         cam->height = camera_sizes[size].height;
1031         cam->size = size;
1032
1033         uvd->debug = debug;
1034         uvd->flags = 0;
1035         uvd->dev = dev;
1036         uvd->iface = intf->altsetting->desc.bInterfaceNumber;
1037         uvd->ifaceAltActive = ifacenum;
1038         uvd->ifaceAltInactive = ifacenum_inact;
1039         uvd->video_endp = video_ep;
1040         uvd->iso_packet_len = buffer_size;
1041         uvd->paletteBits = 1L << VIDEO_PALETTE_RGB24;
1042         uvd->defaultPalette = VIDEO_PALETTE_RGB24;
1043         uvd->canvas = VIDEOSIZE(320, 240);
1044         uvd->videosize = VIDEOSIZE(cam->width, cam->height);
1045         err = qcm_configure_video(uvd);
1046         if (err) {
1047                 err("failed to configure video settings");
1048                 return err;
1049         }
1050
1051         err = usbvideo_RegisterVideoDevice(uvd);
1052         if (err) { /* the uvd gets freed in Deregister */
1053                 err("usbvideo_RegisterVideoDevice() failed.");
1054                 return err;
1055         }
1056
1057         uvd->max_frame_size = (320 * 240 * 3);
1058         qcm_register_input(cam, dev);
1059         usb_set_intfdata(intf, uvd);
1060         return 0;
1061 }
1062
1063 static void qcm_free_uvd(struct uvd *uvd)
1064 {
1065         struct qcm *cam = (struct qcm *) uvd->user_data;
1066
1067         kfree(cam->scratch);
1068         qcm_unregister_input(cam);
1069         qcm_free_int(cam);
1070 }
1071
1072 static struct usbvideo_cb qcm_driver = {
1073         .probe =                qcm_probe,
1074         .setupOnOpen =          qcm_setup_on_open,
1075         .processData =          qcm_process_isoc,
1076         .setVideoMode =         qcm_set_video_mode,
1077         .startDataPump =        qcm_start_data,
1078         .stopDataPump =         qcm_stop_data,
1079         .adjustPicture =        qcm_adjust_picture,
1080         .userFree =             qcm_free_uvd
1081 };
1082
1083 static int __init qcm_init(void)
1084 {
1085         info(DRIVER_DESC " " DRIVER_VERSION);
1086
1087         return usbvideo_register(
1088                 &cams,
1089                 MAX_CAMERAS,
1090                 sizeof(struct qcm),
1091                 "QCM",
1092                 &qcm_driver,
1093                 THIS_MODULE,
1094                 qcm_table);
1095 }
1096
1097 static void __exit qcm_exit(void)
1098 {
1099         usbvideo_Deregister(&cams);
1100 }
1101
1102 module_param(size, int, 0);
1103 MODULE_PARM_DESC(size, "Initial Size 0: 160x120 1: 320x240");
1104 module_param(colour, int, 0);
1105 MODULE_PARM_DESC(colour, "Initial colour");
1106 module_param(hue, int, 0);
1107 MODULE_PARM_DESC(hue, "Initial hue");
1108 module_param(brightness, int, 0);
1109 MODULE_PARM_DESC(brightness, "Initial brightness");
1110 module_param(contrast, int, 0);
1111 MODULE_PARM_DESC(contrast, "Initial contrast");
1112 module_param(whiteness, int, 0);
1113 MODULE_PARM_DESC(whiteness, "Initial whiteness");
1114
1115 #ifdef CONFIG_USB_DEBUG
1116 module_param(debug, int, S_IRUGO | S_IWUSR);
1117 MODULE_PARM_DESC(debug, "Debug level: 0-9 (default=0)");
1118 #endif
1119
1120 module_init(qcm_init);
1121 module_exit(qcm_exit);
1122
1123 MODULE_LICENSE("GPL");
1124 MODULE_AUTHOR("Jaya Kumar");
1125 MODULE_DESCRIPTION("QCM USB Camera");
1126 MODULE_SUPPORTED_DEVICE("QCM USB Camera");