1 /* 2 * copyright (C) 1999/2000 by Henning Zabel <henning@uni-paderborn.de> 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the 6 * Free Software Foundation; either version 2 of the License, or (at your 7 * option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software Foundation, 16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 20 /* 21 * USB-Kernel Driver for the Mustek MDC800 Digital Camera 22 * (c) 1999/2000 Henning Zabel <henning@uni-paderborn.de> 23 * 24 * 25 * The driver brings the USB functions of the MDC800 to Linux. 26 * To use the Camera you must support the USB Protocol of the camera 27 * to the Kernel Node. 28 * The Driver uses a misc device Node. Create it with : 29 * mknod /dev/mustek c 180 32 30 * 31 * The driver supports only one camera. 32 * 33 * Fix: mdc800 used sleep_on and slept with io_lock held. 34 * Converted sleep_on to waitqueues with schedule_timeout and made io_lock 35 * a semaphore from a spinlock. 36 * by Oliver Neukum <oliver@neukum.name> 37 * (02/12/2001) 38 * 39 * Identify version on module load. 40 * (08/04/2001) gb 41 * 42 * version 0.7.5 43 * Fixed potential SMP races with Spinlocks. 44 * Thanks to Oliver Neukum <oliver@neukum.name> who 45 * noticed the race conditions. 46 * (30/10/2000) 47 * 48 * Fixed: Setting urb->dev before submitting urb. 49 * by Greg KH <greg@kroah.com> 50 * (13/10/2000) 51 * 52 * version 0.7.3 53 * bugfix : The mdc800->state field gets set to READY after the 54 * the diconnect function sets it to NOT_CONNECTED. This makes the 55 * driver running like the camera is connected and causes some 56 * hang ups. 57 * 58 * version 0.7.1 59 * MOD_INC and MOD_DEC are changed in usb_probe to prevent load/unload 60 * problems when compiled as Module. 61 * (04/04/2000) 62 * 63 * The mdc800 driver gets assigned the USB Minor 32-47. The Registration 64 * was updated to use these values. 65 * (26/03/2000) 66 * 67 * The Init und Exit Module Function are updated. 68 * (01/03/2000) 69 * 70 * version 0.7.0 71 * Rewrite of the driver : The driver now uses URB's. The old stuff 72 * has been removed. 73 * 74 * version 0.6.0 75 * Rewrite of this driver: The Emulation of the rs232 protocoll 76 * has been removed from the driver. A special executeCommand function 77 * for this driver is included to gphoto. 78 * The driver supports two kind of communication to bulk endpoints. 79 * Either with the dev->bus->ops->bulk... or with callback function. 80 * (09/11/1999) 81 * 82 * version 0.5.0: 83 * first Version that gets a version number. Most of the needed 84 * functions work. 85 * (20/10/1999) 86 */ 87 88 #include <linux/sched.h> 89 #include <linux/signal.h> 90 #include <linux/spinlock.h> 91 #include <linux/errno.h> 92 #include <linux/random.h> 93 #include <linux/poll.h> 94 #include <linux/init.h> 95 #include <linux/slab.h> 96 #include <linux/module.h> 97 #include <linux/wait.h> 98 #include <linux/mutex.h> 99 100 #include <linux/usb.h> 101 #include <linux/fs.h> 102 103 /* 104 * Version Information 105 */ 106 #define DRIVER_VERSION "v0.7.5 (30/10/2000)" 107 #define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>" 108 #define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera" 109 110 /* Vendor and Product Information */ 111 #define MDC800_VENDOR_ID 0x055f 112 #define MDC800_PRODUCT_ID 0xa800 113 114 /* Timeouts (msec) */ 115 #define TO_DOWNLOAD_GET_READY 1500 116 #define TO_DOWNLOAD_GET_BUSY 1500 117 #define TO_WRITE_GET_READY 1000 118 #define TO_DEFAULT_COMMAND 5000 119 #define TO_READ_FROM_IRQ TO_DEFAULT_COMMAND 120 #define TO_GET_READY TO_DEFAULT_COMMAND 121 122 /* Minor Number of the device (create with mknod /dev/mustek c 180 32) */ 123 #define MDC800_DEVICE_MINOR_BASE 32 124 125 126 /************************************************************************** 127 Data and structs 128 ***************************************************************************/ 129 130 131 typedef enum { 132 NOT_CONNECTED, READY, WORKING, DOWNLOAD 133 } mdc800_state; 134 135 136 /* Data for the driver */ 137 struct mdc800_data 138 { 139 struct usb_device * dev; // Device Data 140 mdc800_state state; 141 142 unsigned int endpoint [4]; 143 144 struct urb * irq_urb; 145 wait_queue_head_t irq_wait; 146 int irq_woken; 147 char* irq_urb_buffer; 148 149 int camera_busy; // is camera busy ? 150 int camera_request_ready; // Status to synchronize with irq 151 char camera_response [8]; // last Bytes send after busy 152 153 struct urb * write_urb; 154 char* write_urb_buffer; 155 wait_queue_head_t write_wait; 156 int written; 157 158 159 struct urb * download_urb; 160 char* download_urb_buffer; 161 wait_queue_head_t download_wait; 162 int downloaded; 163 int download_left; // Bytes left to download ? 164 165 166 /* Device Data */ 167 char out [64]; // Answer Buffer 168 int out_ptr; // Index to the first not readen byte 169 int out_count; // Bytes in the buffer 170 171 int open; // Camera device open ? 172 struct mutex io_lock; // IO -lock 173 174 char in [8]; // Command Input Buffer 175 int in_count; 176 177 int pic_index; // Cache for the Imagesize (-1 for nothing cached ) 178 int pic_len; 179 int minor; 180 }; 181 182 183 /* Specification of the Endpoints */ 184 static struct usb_endpoint_descriptor mdc800_ed [4] = 185 { 186 { 187 .bLength = 0, 188 .bDescriptorType = 0, 189 .bEndpointAddress = 0x01, 190 .bmAttributes = 0x02, 191 .wMaxPacketSize = __constant_cpu_to_le16(8), 192 .bInterval = 0, 193 .bRefresh = 0, 194 .bSynchAddress = 0, 195 }, 196 { 197 .bLength = 0, 198 .bDescriptorType = 0, 199 .bEndpointAddress = 0x82, 200 .bmAttributes = 0x03, 201 .wMaxPacketSize = __constant_cpu_to_le16(8), 202 .bInterval = 0, 203 .bRefresh = 0, 204 .bSynchAddress = 0, 205 }, 206 { 207 .bLength = 0, 208 .bDescriptorType = 0, 209 .bEndpointAddress = 0x03, 210 .bmAttributes = 0x02, 211 .wMaxPacketSize = __constant_cpu_to_le16(64), 212 .bInterval = 0, 213 .bRefresh = 0, 214 .bSynchAddress = 0, 215 }, 216 { 217 .bLength = 0, 218 .bDescriptorType = 0, 219 .bEndpointAddress = 0x84, 220 .bmAttributes = 0x02, 221 .wMaxPacketSize = __constant_cpu_to_le16(64), 222 .bInterval = 0, 223 .bRefresh = 0, 224 .bSynchAddress = 0, 225 }, 226 }; 227 228 /* The Variable used by the driver */ 229 static struct mdc800_data* mdc800; 230 231 232 /*************************************************************************** 233 The USB Part of the driver 234 ****************************************************************************/ 235 236 static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b) 237 { 238 return ( 239 ( a->bEndpointAddress == b->bEndpointAddress ) 240 && ( a->bmAttributes == b->bmAttributes ) 241 && ( a->wMaxPacketSize == b->wMaxPacketSize ) 242 ); 243 } 244 245 246 /* 247 * Checks whether the camera responds busy 248 */ 249 static int mdc800_isBusy (char* ch) 250 { 251 int i=0; 252 while (i<8) 253 { 254 if (ch [i] != (char)0x99) 255 return 0; 256 i++; 257 } 258 return 1; 259 } 260 261 262 /* 263 * Checks whether the Camera is ready 264 */ 265 static int mdc800_isReady (char *ch) 266 { 267 int i=0; 268 while (i<8) 269 { 270 if (ch [i] != (char)0xbb) 271 return 0; 272 i++; 273 } 274 return 1; 275 } 276 277 278 279 /* 280 * USB IRQ Handler for InputLine 281 */ 282 static void mdc800_usb_irq (struct urb *urb) 283 { 284 int data_received=0, wake_up; 285 unsigned char* b=urb->transfer_buffer; 286 struct mdc800_data* mdc800=urb->context; 287 int status = urb->status; 288 289 if (status >= 0) { 290 291 //dbg ("%i %i %i %i %i %i %i %i \n",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]); 292 293 if (mdc800_isBusy (b)) 294 { 295 if (!mdc800->camera_busy) 296 { 297 mdc800->camera_busy=1; 298 dbg ("gets busy"); 299 } 300 } 301 else 302 { 303 if (mdc800->camera_busy && mdc800_isReady (b)) 304 { 305 mdc800->camera_busy=0; 306 dbg ("gets ready"); 307 } 308 } 309 if (!(mdc800_isBusy (b) || mdc800_isReady (b))) 310 { 311 /* Store Data in camera_answer field */ 312 dbg ("%i %i %i %i %i %i %i %i ",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]); 313 314 memcpy (mdc800->camera_response,b,8); 315 data_received=1; 316 } 317 } 318 wake_up= ( mdc800->camera_request_ready > 0 ) 319 && 320 ( 321 ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy)) 322 || 323 ((mdc800->camera_request_ready == 2) && data_received) 324 || 325 ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy)) 326 || 327 (status < 0) 328 ); 329 330 if (wake_up) 331 { 332 mdc800->camera_request_ready=0; 333 mdc800->irq_woken=1; 334 wake_up (&mdc800->irq_wait); 335 } 336 } 337 338 339 /* 340 * Waits a while until the irq responds that camera is ready 341 * 342 * mode : 0: Wait for camera gets ready 343 * 1: Wait for receiving data 344 * 2: Wait for camera gets busy 345 * 346 * msec: Time to wait 347 */ 348 static int mdc800_usb_waitForIRQ (int mode, int msec) 349 { 350 mdc800->camera_request_ready=1+mode; 351 352 wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000); 353 mdc800->irq_woken = 0; 354 355 if (mdc800->camera_request_ready>0) 356 { 357 mdc800->camera_request_ready=0; 358 err ("timeout waiting for camera."); 359 return -1; 360 } 361 362 if (mdc800->state == NOT_CONNECTED) 363 { 364 warn ("Camera gets disconnected during waiting for irq."); 365 mdc800->camera_request_ready=0; 366 return -2; 367 } 368 369 return 0; 370 } 371 372 373 /* 374 * The write_urb callback function 375 */ 376 static void mdc800_usb_write_notify (struct urb *urb) 377 { 378 struct mdc800_data* mdc800=urb->context; 379 int status = urb->status; 380 381 if (status != 0) 382 err ("writing command fails (status=%i)", status); 383 else 384 mdc800->state=READY; 385 mdc800->written = 1; 386 wake_up (&mdc800->write_wait); 387 } 388 389 390 /* 391 * The download_urb callback function 392 */ 393 static void mdc800_usb_download_notify (struct urb *urb) 394 { 395 struct mdc800_data* mdc800=urb->context; 396 int status = urb->status; 397 398 if (status == 0) { 399 /* Fill output buffer with these data */ 400 memcpy (mdc800->out, urb->transfer_buffer, 64); 401 mdc800->out_count=64; 402 mdc800->out_ptr=0; 403 mdc800->download_left-=64; 404 if (mdc800->download_left == 0) 405 { 406 mdc800->state=READY; 407 } 408 } else { 409 err ("request bytes fails (status:%i)", status); 410 } 411 mdc800->downloaded = 1; 412 wake_up (&mdc800->download_wait); 413 } 414 415 416 /*************************************************************************** 417 Probing for the Camera 418 ***************************************************************************/ 419 420 static struct usb_driver mdc800_usb_driver; 421 static const struct file_operations mdc800_device_ops; 422 static struct usb_class_driver mdc800_class = { 423 .name = "mdc800%d", 424 .fops = &mdc800_device_ops, 425 .minor_base = MDC800_DEVICE_MINOR_BASE, 426 }; 427 428 429 /* 430 * Callback to search the Mustek MDC800 on the USB Bus 431 */ 432 static int mdc800_usb_probe (struct usb_interface *intf, 433 const struct usb_device_id *id) 434 { 435 int i,j; 436 struct usb_host_interface *intf_desc; 437 struct usb_device *dev = interface_to_usbdev (intf); 438 int irq_interval=0; 439 int retval; 440 441 dbg ("(mdc800_usb_probe) called."); 442 443 444 if (mdc800->dev != NULL) 445 { 446 warn ("only one Mustek MDC800 is supported."); 447 return -ENODEV; 448 } 449 450 if (dev->descriptor.bNumConfigurations != 1) 451 { 452 err ("probe fails -> wrong Number of Configuration"); 453 return -ENODEV; 454 } 455 intf_desc = intf->cur_altsetting; 456 457 if ( 458 ( intf_desc->desc.bInterfaceClass != 0xff ) 459 || ( intf_desc->desc.bInterfaceSubClass != 0 ) 460 || ( intf_desc->desc.bInterfaceProtocol != 0 ) 461 || ( intf_desc->desc.bNumEndpoints != 4) 462 ) 463 { 464 err ("probe fails -> wrong Interface"); 465 return -ENODEV; 466 } 467 468 /* Check the Endpoints */ 469 for (i=0; i<4; i++) 470 { 471 mdc800->endpoint[i]=-1; 472 for (j=0; j<4; j++) 473 { 474 if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i])) 475 { 476 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ; 477 if (i==1) 478 { 479 irq_interval=intf_desc->endpoint [j].desc.bInterval; 480 } 481 482 continue; 483 } 484 } 485 if (mdc800->endpoint[i] == -1) 486 { 487 err ("probe fails -> Wrong Endpoints."); 488 return -ENODEV; 489 } 490 } 491 492 493 info ("Found Mustek MDC800 on USB."); 494 495 mutex_lock(&mdc800->io_lock); 496 497 retval = usb_register_dev(intf, &mdc800_class); 498 if (retval) { 499 err ("Not able to get a minor for this device."); 500 return -ENODEV; 501 } 502 503 mdc800->dev=dev; 504 mdc800->open=0; 505 506 /* Setup URB Structs */ 507 usb_fill_int_urb ( 508 mdc800->irq_urb, 509 mdc800->dev, 510 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]), 511 mdc800->irq_urb_buffer, 512 8, 513 mdc800_usb_irq, 514 mdc800, 515 irq_interval 516 ); 517 518 usb_fill_bulk_urb ( 519 mdc800->write_urb, 520 mdc800->dev, 521 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]), 522 mdc800->write_urb_buffer, 523 8, 524 mdc800_usb_write_notify, 525 mdc800 526 ); 527 528 usb_fill_bulk_urb ( 529 mdc800->download_urb, 530 mdc800->dev, 531 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]), 532 mdc800->download_urb_buffer, 533 64, 534 mdc800_usb_download_notify, 535 mdc800 536 ); 537 538 mdc800->state=READY; 539 540 mutex_unlock(&mdc800->io_lock); 541 542 usb_set_intfdata(intf, mdc800); 543 return 0; 544 } 545 546 547 /* 548 * Disconnect USB device (maybe the MDC800) 549 */ 550 static void mdc800_usb_disconnect (struct usb_interface *intf) 551 { 552 struct mdc800_data* mdc800 = usb_get_intfdata(intf); 553 554 dbg ("(mdc800_usb_disconnect) called"); 555 556 if (mdc800) { 557 if (mdc800->state == NOT_CONNECTED) 558 return; 559 560 usb_deregister_dev(intf, &mdc800_class); 561 562 /* must be under lock to make sure no URB 563 is submitted after usb_kill_urb() */ 564 mutex_lock(&mdc800->io_lock); 565 mdc800->state=NOT_CONNECTED; 566 567 usb_kill_urb(mdc800->irq_urb); 568 usb_kill_urb(mdc800->write_urb); 569 usb_kill_urb(mdc800->download_urb); 570 mutex_unlock(&mdc800->io_lock); 571 572 mdc800->dev = NULL; 573 usb_set_intfdata(intf, NULL); 574 } 575 info ("Mustek MDC800 disconnected from USB."); 576 } 577 578 579 /*************************************************************************** 580 The Misc device Part (file_operations) 581 ****************************************************************************/ 582 583 /* 584 * This Function calc the Answersize for a command. 585 */ 586 static int mdc800_getAnswerSize (char command) 587 { 588 switch ((unsigned char) command) 589 { 590 case 0x2a: 591 case 0x49: 592 case 0x51: 593 case 0x0d: 594 case 0x20: 595 case 0x07: 596 case 0x01: 597 case 0x25: 598 case 0x00: 599 return 8; 600 601 case 0x05: 602 case 0x3e: 603 return mdc800->pic_len; 604 605 case 0x09: 606 return 4096; 607 608 default: 609 return 0; 610 } 611 } 612 613 614 /* 615 * Init the device: (1) alloc mem (2) Increase MOD Count .. 616 */ 617 static int mdc800_device_open (struct inode* inode, struct file *file) 618 { 619 int retval=0; 620 int errn=0; 621 622 mutex_lock(&mdc800->io_lock); 623 624 if (mdc800->state == NOT_CONNECTED) 625 { 626 errn=-EBUSY; 627 goto error_out; 628 } 629 if (mdc800->open) 630 { 631 errn=-EBUSY; 632 goto error_out; 633 } 634 635 mdc800->in_count=0; 636 mdc800->out_count=0; 637 mdc800->out_ptr=0; 638 mdc800->pic_index=0; 639 mdc800->pic_len=-1; 640 mdc800->download_left=0; 641 642 mdc800->camera_busy=0; 643 mdc800->camera_request_ready=0; 644 645 retval=0; 646 mdc800->irq_urb->dev = mdc800->dev; 647 retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL); 648 if (retval) { 649 err ("request USB irq fails (submit_retval=%i).", retval); 650 errn = -EIO; 651 goto error_out; 652 } 653 654 mdc800->open=1; 655 dbg ("Mustek MDC800 device opened."); 656 657 error_out: 658 mutex_unlock(&mdc800->io_lock); 659 return errn; 660 } 661 662 663 /* 664 * Close the Camera and release Memory 665 */ 666 static int mdc800_device_release (struct inode* inode, struct file *file) 667 { 668 int retval=0; 669 dbg ("Mustek MDC800 device closed."); 670 671 mutex_lock(&mdc800->io_lock); 672 if (mdc800->open && (mdc800->state != NOT_CONNECTED)) 673 { 674 usb_kill_urb(mdc800->irq_urb); 675 usb_kill_urb(mdc800->write_urb); 676 usb_kill_urb(mdc800->download_urb); 677 mdc800->open=0; 678 } 679 else 680 { 681 retval=-EIO; 682 } 683 684 mutex_unlock(&mdc800->io_lock); 685 return retval; 686 } 687 688 689 /* 690 * The Device read callback Function 691 */ 692 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos) 693 { 694 size_t left=len, sts=len; /* single transfer size */ 695 char __user *ptr = buf; 696 int retval; 697 698 mutex_lock(&mdc800->io_lock); 699 if (mdc800->state == NOT_CONNECTED) 700 { 701 mutex_unlock(&mdc800->io_lock); 702 return -EBUSY; 703 } 704 if (mdc800->state == WORKING) 705 { 706 warn ("Illegal State \"working\" reached during read ?!"); 707 mutex_unlock(&mdc800->io_lock); 708 return -EBUSY; 709 } 710 if (!mdc800->open) 711 { 712 mutex_unlock(&mdc800->io_lock); 713 return -EBUSY; 714 } 715 716 while (left) 717 { 718 if (signal_pending (current)) 719 { 720 mutex_unlock(&mdc800->io_lock); 721 return -EINTR; 722 } 723 724 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left; 725 726 if (sts <= 0) 727 { 728 /* Too less Data in buffer */ 729 if (mdc800->state == DOWNLOAD) 730 { 731 mdc800->out_count=0; 732 mdc800->out_ptr=0; 733 734 /* Download -> Request new bytes */ 735 mdc800->download_urb->dev = mdc800->dev; 736 retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL); 737 if (retval) { 738 err ("Can't submit download urb (retval=%i)",retval); 739 mutex_unlock(&mdc800->io_lock); 740 return len-left; 741 } 742 wait_event_timeout(mdc800->download_wait, mdc800->downloaded, 743 TO_DOWNLOAD_GET_READY*HZ/1000); 744 mdc800->downloaded = 0; 745 if (mdc800->download_urb->status != 0) 746 { 747 err ("request download-bytes fails (status=%i)",mdc800->download_urb->status); 748 mutex_unlock(&mdc800->io_lock); 749 return len-left; 750 } 751 } 752 else 753 { 754 /* No more bytes -> that's an error*/ 755 mutex_unlock(&mdc800->io_lock); 756 return -EIO; 757 } 758 } 759 else 760 { 761 /* Copy Bytes */ 762 if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr], 763 sts)) { 764 mutex_unlock(&mdc800->io_lock); 765 return -EFAULT; 766 } 767 ptr+=sts; 768 left-=sts; 769 mdc800->out_ptr+=sts; 770 } 771 } 772 773 mutex_unlock(&mdc800->io_lock); 774 return len-left; 775 } 776 777 778 /* 779 * The Device write callback Function 780 * If a 8Byte Command is received, it will be send to the camera. 781 * After this the driver initiates the request for the answer or 782 * just waits until the camera becomes ready. 783 */ 784 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos) 785 { 786 size_t i=0; 787 int retval; 788 789 mutex_lock(&mdc800->io_lock); 790 if (mdc800->state != READY) 791 { 792 mutex_unlock(&mdc800->io_lock); 793 return -EBUSY; 794 } 795 if (!mdc800->open ) 796 { 797 mutex_unlock(&mdc800->io_lock); 798 return -EBUSY; 799 } 800 801 while (i<len) 802 { 803 unsigned char c; 804 if (signal_pending (current)) 805 { 806 mutex_unlock(&mdc800->io_lock); 807 return -EINTR; 808 } 809 810 if(get_user(c, buf+i)) 811 { 812 mutex_unlock(&mdc800->io_lock); 813 return -EFAULT; 814 } 815 816 /* check for command start */ 817 if (c == 0x55) 818 { 819 mdc800->in_count=0; 820 mdc800->out_count=0; 821 mdc800->out_ptr=0; 822 mdc800->download_left=0; 823 } 824 825 /* save command byte */ 826 if (mdc800->in_count < 8) 827 { 828 mdc800->in[mdc800->in_count] = c; 829 mdc800->in_count++; 830 } 831 else 832 { 833 mutex_unlock(&mdc800->io_lock); 834 return -EIO; 835 } 836 837 /* Command Buffer full ? -> send it to camera */ 838 if (mdc800->in_count == 8) 839 { 840 int answersize; 841 842 if (mdc800_usb_waitForIRQ (0,TO_GET_READY)) 843 { 844 err ("Camera didn't get ready.\n"); 845 mutex_unlock(&mdc800->io_lock); 846 return -EIO; 847 } 848 849 answersize=mdc800_getAnswerSize (mdc800->in[1]); 850 851 mdc800->state=WORKING; 852 memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8); 853 mdc800->write_urb->dev = mdc800->dev; 854 retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL); 855 if (retval) { 856 err ("submitting write urb fails (retval=%i)", retval); 857 mutex_unlock(&mdc800->io_lock); 858 return -EIO; 859 } 860 wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000); 861 mdc800->written = 0; 862 if (mdc800->state == WORKING) 863 { 864 usb_kill_urb(mdc800->write_urb); 865 mutex_unlock(&mdc800->io_lock); 866 return -EIO; 867 } 868 869 switch ((unsigned char) mdc800->in[1]) 870 { 871 case 0x05: /* Download Image */ 872 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */ 873 if (mdc800->pic_len < 0) 874 { 875 err ("call 0x07 before 0x05,0x3e"); 876 mdc800->state=READY; 877 mutex_unlock(&mdc800->io_lock); 878 return -EIO; 879 } 880 mdc800->pic_len=-1; 881 882 case 0x09: /* Download Thumbnail */ 883 mdc800->download_left=answersize+64; 884 mdc800->state=DOWNLOAD; 885 mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY); 886 break; 887 888 889 default: 890 if (answersize) 891 { 892 893 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ)) 894 { 895 err ("requesting answer from irq fails"); 896 mutex_unlock(&mdc800->io_lock); 897 return -EIO; 898 } 899 900 /* Write dummy data, (this is ugly but part of the USB Protocol */ 901 /* if you use endpoint 1 as bulk and not as irq) */ 902 memcpy (mdc800->out, mdc800->camera_response,8); 903 904 /* This is the interpreted answer */ 905 memcpy (&mdc800->out[8], mdc800->camera_response,8); 906 907 mdc800->out_ptr=0; 908 mdc800->out_count=16; 909 910 /* Cache the Imagesize, if command was getImageSize */ 911 if (mdc800->in [1] == (char) 0x07) 912 { 913 mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2]; 914 915 dbg ("cached imagesize = %i",mdc800->pic_len); 916 } 917 918 } 919 else 920 { 921 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND)) 922 { 923 err ("Command Timeout."); 924 mutex_unlock(&mdc800->io_lock); 925 return -EIO; 926 } 927 } 928 mdc800->state=READY; 929 break; 930 } 931 } 932 i++; 933 } 934 mutex_unlock(&mdc800->io_lock); 935 return i; 936 } 937 938 939 /*************************************************************************** 940 Init and Cleanup this driver (Structs and types) 941 ****************************************************************************/ 942 943 /* File Operations of this drivers */ 944 static const struct file_operations mdc800_device_ops = 945 { 946 .owner = THIS_MODULE, 947 .read = mdc800_device_read, 948 .write = mdc800_device_write, 949 .open = mdc800_device_open, 950 .release = mdc800_device_release, 951 }; 952 953 954 955 static struct usb_device_id mdc800_table [] = { 956 { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) }, 957 { } /* Terminating entry */ 958 }; 959 960 MODULE_DEVICE_TABLE (usb, mdc800_table); 961 /* 962 * USB Driver Struct for this device 963 */ 964 static struct usb_driver mdc800_usb_driver = 965 { 966 .name = "mdc800", 967 .probe = mdc800_usb_probe, 968 .disconnect = mdc800_usb_disconnect, 969 .id_table = mdc800_table 970 }; 971 972 973 974 /************************************************************************ 975 Init and Cleanup this driver (Main Functions) 976 *************************************************************************/ 977 978 static int __init usb_mdc800_init (void) 979 { 980 int retval = -ENODEV; 981 /* Allocate Memory */ 982 mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL); 983 if (!mdc800) 984 goto cleanup_on_fail; 985 986 mdc800->dev = NULL; 987 mdc800->state=NOT_CONNECTED; 988 mutex_init (&mdc800->io_lock); 989 990 init_waitqueue_head (&mdc800->irq_wait); 991 init_waitqueue_head (&mdc800->write_wait); 992 init_waitqueue_head (&mdc800->download_wait); 993 994 mdc800->irq_woken = 0; 995 mdc800->downloaded = 0; 996 mdc800->written = 0; 997 998 mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL); 999 if (!mdc800->irq_urb_buffer) 1000 goto cleanup_on_fail; 1001 mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL); 1002 if (!mdc800->write_urb_buffer) 1003 goto cleanup_on_fail; 1004 mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL); 1005 if (!mdc800->download_urb_buffer) 1006 goto cleanup_on_fail; 1007 1008 mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL); 1009 if (!mdc800->irq_urb) 1010 goto cleanup_on_fail; 1011 mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL); 1012 if (!mdc800->download_urb) 1013 goto cleanup_on_fail; 1014 mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL); 1015 if (!mdc800->write_urb) 1016 goto cleanup_on_fail; 1017 1018 /* Register the driver */ 1019 retval = usb_register(&mdc800_usb_driver); 1020 if (retval) 1021 goto cleanup_on_fail; 1022 1023 info (DRIVER_VERSION ":" DRIVER_DESC); 1024 1025 return 0; 1026 1027 /* Clean driver up, when something fails */ 1028 1029 cleanup_on_fail: 1030 1031 if (mdc800 != NULL) 1032 { 1033 err ("can't alloc memory!"); 1034 1035 kfree(mdc800->download_urb_buffer); 1036 kfree(mdc800->write_urb_buffer); 1037 kfree(mdc800->irq_urb_buffer); 1038 1039 usb_free_urb(mdc800->write_urb); 1040 usb_free_urb(mdc800->download_urb); 1041 usb_free_urb(mdc800->irq_urb); 1042 1043 kfree (mdc800); 1044 } 1045 mdc800 = NULL; 1046 return retval; 1047 } 1048 1049 1050 static void __exit usb_mdc800_cleanup (void) 1051 { 1052 usb_deregister (&mdc800_usb_driver); 1053 1054 usb_free_urb (mdc800->irq_urb); 1055 usb_free_urb (mdc800->download_urb); 1056 usb_free_urb (mdc800->write_urb); 1057 1058 kfree (mdc800->irq_urb_buffer); 1059 kfree (mdc800->write_urb_buffer); 1060 kfree (mdc800->download_urb_buffer); 1061 1062 kfree (mdc800); 1063 mdc800 = NULL; 1064 } 1065 1066 module_init (usb_mdc800_init); 1067 module_exit (usb_mdc800_cleanup); 1068 1069 MODULE_AUTHOR( DRIVER_AUTHOR ); 1070 MODULE_DESCRIPTION( DRIVER_DESC ); 1071 MODULE_LICENSE("GPL"); 1072 1073