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/smp_lock.h> 98 #include <linux/wait.h> 99 #include <linux/mutex.h> 100 101 #include <linux/usb.h> 102 #include <linux/fs.h> 103 104 /* 105 * Version Information 106 */ 107 #define DRIVER_VERSION "v0.7.5 (30/10/2000)" 108 #define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>" 109 #define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera" 110 111 /* Vendor and Product Information */ 112 #define MDC800_VENDOR_ID 0x055f 113 #define MDC800_PRODUCT_ID 0xa800 114 115 /* Timeouts (msec) */ 116 #define TO_DOWNLOAD_GET_READY 1500 117 #define TO_DOWNLOAD_GET_BUSY 1500 118 #define TO_WRITE_GET_READY 1000 119 #define TO_DEFAULT_COMMAND 5000 120 #define TO_READ_FROM_IRQ TO_DEFAULT_COMMAND 121 #define TO_GET_READY TO_DEFAULT_COMMAND 122 123 /* Minor Number of the device (create with mknod /dev/mustek c 180 32) */ 124 #define MDC800_DEVICE_MINOR_BASE 32 125 126 127 /************************************************************************** 128 Data and structs 129 ***************************************************************************/ 130 131 132 typedef enum { 133 NOT_CONNECTED, READY, WORKING, DOWNLOAD 134 } mdc800_state; 135 136 137 /* Data for the driver */ 138 struct mdc800_data 139 { 140 struct usb_device * dev; // Device Data 141 mdc800_state state; 142 143 unsigned int endpoint [4]; 144 145 struct urb * irq_urb; 146 wait_queue_head_t irq_wait; 147 int irq_woken; 148 char* irq_urb_buffer; 149 150 int camera_busy; // is camera busy ? 151 int camera_request_ready; // Status to synchronize with irq 152 char camera_response [8]; // last Bytes send after busy 153 154 struct urb * write_urb; 155 char* write_urb_buffer; 156 wait_queue_head_t write_wait; 157 int written; 158 159 160 struct urb * download_urb; 161 char* download_urb_buffer; 162 wait_queue_head_t download_wait; 163 int downloaded; 164 int download_left; // Bytes left to download ? 165 166 167 /* Device Data */ 168 char out [64]; // Answer Buffer 169 int out_ptr; // Index to the first not readen byte 170 int out_count; // Bytes in the buffer 171 172 int open; // Camera device open ? 173 struct mutex io_lock; // IO -lock 174 175 char in [8]; // Command Input Buffer 176 int in_count; 177 178 int pic_index; // Cache for the Imagesize (-1 for nothing cached ) 179 int pic_len; 180 int minor; 181 }; 182 183 184 /* Specification of the Endpoints */ 185 static struct usb_endpoint_descriptor mdc800_ed [4] = 186 { 187 { 188 .bLength = 0, 189 .bDescriptorType = 0, 190 .bEndpointAddress = 0x01, 191 .bmAttributes = 0x02, 192 .wMaxPacketSize = __constant_cpu_to_le16(8), 193 .bInterval = 0, 194 .bRefresh = 0, 195 .bSynchAddress = 0, 196 }, 197 { 198 .bLength = 0, 199 .bDescriptorType = 0, 200 .bEndpointAddress = 0x82, 201 .bmAttributes = 0x03, 202 .wMaxPacketSize = __constant_cpu_to_le16(8), 203 .bInterval = 0, 204 .bRefresh = 0, 205 .bSynchAddress = 0, 206 }, 207 { 208 .bLength = 0, 209 .bDescriptorType = 0, 210 .bEndpointAddress = 0x03, 211 .bmAttributes = 0x02, 212 .wMaxPacketSize = __constant_cpu_to_le16(64), 213 .bInterval = 0, 214 .bRefresh = 0, 215 .bSynchAddress = 0, 216 }, 217 { 218 .bLength = 0, 219 .bDescriptorType = 0, 220 .bEndpointAddress = 0x84, 221 .bmAttributes = 0x02, 222 .wMaxPacketSize = __constant_cpu_to_le16(64), 223 .bInterval = 0, 224 .bRefresh = 0, 225 .bSynchAddress = 0, 226 }, 227 }; 228 229 /* The Variable used by the driver */ 230 static struct mdc800_data* mdc800; 231 232 233 /*************************************************************************** 234 The USB Part of the driver 235 ****************************************************************************/ 236 237 static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b) 238 { 239 return ( 240 ( a->bEndpointAddress == b->bEndpointAddress ) 241 && ( a->bmAttributes == b->bmAttributes ) 242 && ( a->wMaxPacketSize == b->wMaxPacketSize ) 243 ); 244 } 245 246 247 /* 248 * Checks whether the camera responds busy 249 */ 250 static int mdc800_isBusy (char* ch) 251 { 252 int i=0; 253 while (i<8) 254 { 255 if (ch [i] != (char)0x99) 256 return 0; 257 i++; 258 } 259 return 1; 260 } 261 262 263 /* 264 * Checks whether the Camera is ready 265 */ 266 static int mdc800_isReady (char *ch) 267 { 268 int i=0; 269 while (i<8) 270 { 271 if (ch [i] != (char)0xbb) 272 return 0; 273 i++; 274 } 275 return 1; 276 } 277 278 279 280 /* 281 * USB IRQ Handler for InputLine 282 */ 283 static void mdc800_usb_irq (struct urb *urb, struct pt_regs *res) 284 { 285 int data_received=0, wake_up; 286 unsigned char* b=urb->transfer_buffer; 287 struct mdc800_data* mdc800=urb->context; 288 289 if (urb->status >= 0) 290 { 291 292 //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]); 293 294 if (mdc800_isBusy (b)) 295 { 296 if (!mdc800->camera_busy) 297 { 298 mdc800->camera_busy=1; 299 dbg ("gets busy"); 300 } 301 } 302 else 303 { 304 if (mdc800->camera_busy && mdc800_isReady (b)) 305 { 306 mdc800->camera_busy=0; 307 dbg ("gets ready"); 308 } 309 } 310 if (!(mdc800_isBusy (b) || mdc800_isReady (b))) 311 { 312 /* Store Data in camera_answer field */ 313 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]); 314 315 memcpy (mdc800->camera_response,b,8); 316 data_received=1; 317 } 318 } 319 wake_up= ( mdc800->camera_request_ready > 0 ) 320 && 321 ( 322 ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy)) 323 || 324 ((mdc800->camera_request_ready == 2) && data_received) 325 || 326 ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy)) 327 || 328 (urb->status < 0) 329 ); 330 331 if (wake_up) 332 { 333 mdc800->camera_request_ready=0; 334 mdc800->irq_woken=1; 335 wake_up (&mdc800->irq_wait); 336 } 337 } 338 339 340 /* 341 * Waits a while until the irq responds that camera is ready 342 * 343 * mode : 0: Wait for camera gets ready 344 * 1: Wait for receiving data 345 * 2: Wait for camera gets busy 346 * 347 * msec: Time to wait 348 */ 349 static int mdc800_usb_waitForIRQ (int mode, int msec) 350 { 351 mdc800->camera_request_ready=1+mode; 352 353 wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000); 354 mdc800->irq_woken = 0; 355 356 if (mdc800->camera_request_ready>0) 357 { 358 mdc800->camera_request_ready=0; 359 err ("timeout waiting for camera."); 360 return -1; 361 } 362 363 if (mdc800->state == NOT_CONNECTED) 364 { 365 warn ("Camera gets disconnected during waiting for irq."); 366 mdc800->camera_request_ready=0; 367 return -2; 368 } 369 370 return 0; 371 } 372 373 374 /* 375 * The write_urb callback function 376 */ 377 static void mdc800_usb_write_notify (struct urb *urb, struct pt_regs *res) 378 { 379 struct mdc800_data* mdc800=urb->context; 380 381 if (urb->status != 0) 382 { 383 err ("writing command fails (status=%i)", urb->status); 384 } 385 else 386 { 387 mdc800->state=READY; 388 } 389 mdc800->written = 1; 390 wake_up (&mdc800->write_wait); 391 } 392 393 394 /* 395 * The download_urb callback function 396 */ 397 static void mdc800_usb_download_notify (struct urb *urb, struct pt_regs *res) 398 { 399 struct mdc800_data* mdc800=urb->context; 400 401 if (urb->status == 0) 402 { 403 /* Fill output buffer with these data */ 404 memcpy (mdc800->out, urb->transfer_buffer, 64); 405 mdc800->out_count=64; 406 mdc800->out_ptr=0; 407 mdc800->download_left-=64; 408 if (mdc800->download_left == 0) 409 { 410 mdc800->state=READY; 411 } 412 } 413 else 414 { 415 err ("request bytes fails (status:%i)", urb->status); 416 } 417 mdc800->downloaded = 1; 418 wake_up (&mdc800->download_wait); 419 } 420 421 422 /*************************************************************************** 423 Probing for the Camera 424 ***************************************************************************/ 425 426 static struct usb_driver mdc800_usb_driver; 427 static struct file_operations mdc800_device_ops; 428 static struct usb_class_driver mdc800_class = { 429 .name = "mdc800%d", 430 .fops = &mdc800_device_ops, 431 .minor_base = MDC800_DEVICE_MINOR_BASE, 432 }; 433 434 435 /* 436 * Callback to search the Mustek MDC800 on the USB Bus 437 */ 438 static int mdc800_usb_probe (struct usb_interface *intf, 439 const struct usb_device_id *id) 440 { 441 int i,j; 442 struct usb_host_interface *intf_desc; 443 struct usb_device *dev = interface_to_usbdev (intf); 444 int irq_interval=0; 445 int retval; 446 447 dbg ("(mdc800_usb_probe) called."); 448 449 450 if (mdc800->dev != NULL) 451 { 452 warn ("only one Mustek MDC800 is supported."); 453 return -ENODEV; 454 } 455 456 if (dev->descriptor.bNumConfigurations != 1) 457 { 458 err ("probe fails -> wrong Number of Configuration"); 459 return -ENODEV; 460 } 461 intf_desc = intf->cur_altsetting; 462 463 if ( 464 ( intf_desc->desc.bInterfaceClass != 0xff ) 465 || ( intf_desc->desc.bInterfaceSubClass != 0 ) 466 || ( intf_desc->desc.bInterfaceProtocol != 0 ) 467 || ( intf_desc->desc.bNumEndpoints != 4) 468 ) 469 { 470 err ("probe fails -> wrong Interface"); 471 return -ENODEV; 472 } 473 474 /* Check the Endpoints */ 475 for (i=0; i<4; i++) 476 { 477 mdc800->endpoint[i]=-1; 478 for (j=0; j<4; j++) 479 { 480 if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i])) 481 { 482 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ; 483 if (i==1) 484 { 485 irq_interval=intf_desc->endpoint [j].desc.bInterval; 486 } 487 488 continue; 489 } 490 } 491 if (mdc800->endpoint[i] == -1) 492 { 493 err ("probe fails -> Wrong Endpoints."); 494 return -ENODEV; 495 } 496 } 497 498 499 info ("Found Mustek MDC800 on USB."); 500 501 mutex_lock(&mdc800->io_lock); 502 503 retval = usb_register_dev(intf, &mdc800_class); 504 if (retval) { 505 err ("Not able to get a minor for this device."); 506 return -ENODEV; 507 } 508 509 mdc800->dev=dev; 510 mdc800->open=0; 511 512 /* Setup URB Structs */ 513 usb_fill_int_urb ( 514 mdc800->irq_urb, 515 mdc800->dev, 516 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]), 517 mdc800->irq_urb_buffer, 518 8, 519 mdc800_usb_irq, 520 mdc800, 521 irq_interval 522 ); 523 524 usb_fill_bulk_urb ( 525 mdc800->write_urb, 526 mdc800->dev, 527 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]), 528 mdc800->write_urb_buffer, 529 8, 530 mdc800_usb_write_notify, 531 mdc800 532 ); 533 534 usb_fill_bulk_urb ( 535 mdc800->download_urb, 536 mdc800->dev, 537 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]), 538 mdc800->download_urb_buffer, 539 64, 540 mdc800_usb_download_notify, 541 mdc800 542 ); 543 544 mdc800->state=READY; 545 546 mutex_unlock(&mdc800->io_lock); 547 548 usb_set_intfdata(intf, mdc800); 549 return 0; 550 } 551 552 553 /* 554 * Disconnect USB device (maybe the MDC800) 555 */ 556 static void mdc800_usb_disconnect (struct usb_interface *intf) 557 { 558 struct mdc800_data* mdc800 = usb_get_intfdata(intf); 559 560 dbg ("(mdc800_usb_disconnect) called"); 561 562 if (mdc800) { 563 if (mdc800->state == NOT_CONNECTED) 564 return; 565 566 usb_deregister_dev(intf, &mdc800_class); 567 568 mdc800->state=NOT_CONNECTED; 569 570 usb_kill_urb(mdc800->irq_urb); 571 usb_kill_urb(mdc800->write_urb); 572 usb_kill_urb(mdc800->download_urb); 573 574 mdc800->dev = NULL; 575 usb_set_intfdata(intf, NULL); 576 } 577 info ("Mustek MDC800 disconnected from USB."); 578 } 579 580 581 /*************************************************************************** 582 The Misc device Part (file_operations) 583 ****************************************************************************/ 584 585 /* 586 * This Function calc the Answersize for a command. 587 */ 588 static int mdc800_getAnswerSize (char command) 589 { 590 switch ((unsigned char) command) 591 { 592 case 0x2a: 593 case 0x49: 594 case 0x51: 595 case 0x0d: 596 case 0x20: 597 case 0x07: 598 case 0x01: 599 case 0x25: 600 case 0x00: 601 return 8; 602 603 case 0x05: 604 case 0x3e: 605 return mdc800->pic_len; 606 607 case 0x09: 608 return 4096; 609 610 default: 611 return 0; 612 } 613 } 614 615 616 /* 617 * Init the device: (1) alloc mem (2) Increase MOD Count .. 618 */ 619 static int mdc800_device_open (struct inode* inode, struct file *file) 620 { 621 int retval=0; 622 int errn=0; 623 624 mutex_lock(&mdc800->io_lock); 625 626 if (mdc800->state == NOT_CONNECTED) 627 { 628 errn=-EBUSY; 629 goto error_out; 630 } 631 if (mdc800->open) 632 { 633 errn=-EBUSY; 634 goto error_out; 635 } 636 637 mdc800->in_count=0; 638 mdc800->out_count=0; 639 mdc800->out_ptr=0; 640 mdc800->pic_index=0; 641 mdc800->pic_len=-1; 642 mdc800->download_left=0; 643 644 mdc800->camera_busy=0; 645 mdc800->camera_request_ready=0; 646 647 retval=0; 648 mdc800->irq_urb->dev = mdc800->dev; 649 if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL)) 650 { 651 err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status); 652 errn = -EIO; 653 goto error_out; 654 } 655 656 mdc800->open=1; 657 dbg ("Mustek MDC800 device opened."); 658 659 error_out: 660 mutex_unlock(&mdc800->io_lock); 661 return errn; 662 } 663 664 665 /* 666 * Close the Camera and release Memory 667 */ 668 static int mdc800_device_release (struct inode* inode, struct file *file) 669 { 670 int retval=0; 671 dbg ("Mustek MDC800 device closed."); 672 673 mutex_lock(&mdc800->io_lock); 674 if (mdc800->open && (mdc800->state != NOT_CONNECTED)) 675 { 676 usb_kill_urb(mdc800->irq_urb); 677 usb_kill_urb(mdc800->write_urb); 678 usb_kill_urb(mdc800->download_urb); 679 mdc800->open=0; 680 } 681 else 682 { 683 retval=-EIO; 684 } 685 686 mutex_unlock(&mdc800->io_lock); 687 return retval; 688 } 689 690 691 /* 692 * The Device read callback Function 693 */ 694 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos) 695 { 696 size_t left=len, sts=len; /* single transfer size */ 697 char __user *ptr = buf; 698 699 mutex_lock(&mdc800->io_lock); 700 if (mdc800->state == NOT_CONNECTED) 701 { 702 mutex_unlock(&mdc800->io_lock); 703 return -EBUSY; 704 } 705 if (mdc800->state == WORKING) 706 { 707 warn ("Illegal State \"working\" reached during read ?!"); 708 mutex_unlock(&mdc800->io_lock); 709 return -EBUSY; 710 } 711 if (!mdc800->open) 712 { 713 mutex_unlock(&mdc800->io_lock); 714 return -EBUSY; 715 } 716 717 while (left) 718 { 719 if (signal_pending (current)) 720 { 721 mutex_unlock(&mdc800->io_lock); 722 return -EINTR; 723 } 724 725 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left; 726 727 if (sts <= 0) 728 { 729 /* Too less Data in buffer */ 730 if (mdc800->state == DOWNLOAD) 731 { 732 mdc800->out_count=0; 733 mdc800->out_ptr=0; 734 735 /* Download -> Request new bytes */ 736 mdc800->download_urb->dev = mdc800->dev; 737 if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL)) 738 { 739 err ("Can't submit download urb (status=%i)",mdc800->download_urb->status); 740 mutex_unlock(&mdc800->io_lock); 741 return len-left; 742 } 743 wait_event_timeout(mdc800->download_wait, mdc800->downloaded, 744 TO_DOWNLOAD_GET_READY*HZ/1000); 745 mdc800->downloaded = 0; 746 if (mdc800->download_urb->status != 0) 747 { 748 err ("request download-bytes fails (status=%i)",mdc800->download_urb->status); 749 mutex_unlock(&mdc800->io_lock); 750 return len-left; 751 } 752 } 753 else 754 { 755 /* No more bytes -> that's an error*/ 756 mutex_unlock(&mdc800->io_lock); 757 return -EIO; 758 } 759 } 760 else 761 { 762 /* Copy Bytes */ 763 if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr], 764 sts)) { 765 mutex_unlock(&mdc800->io_lock); 766 return -EFAULT; 767 } 768 ptr+=sts; 769 left-=sts; 770 mdc800->out_ptr+=sts; 771 } 772 } 773 774 mutex_unlock(&mdc800->io_lock); 775 return len-left; 776 } 777 778 779 /* 780 * The Device write callback Function 781 * If a 8Byte Command is received, it will be send to the camera. 782 * After this the driver initiates the request for the answer or 783 * just waits until the camera becomes ready. 784 */ 785 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos) 786 { 787 size_t i=0; 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 if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL)) 855 { 856 err ("submitting write urb fails (status=%i)", mdc800->write_urb->status); 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 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