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 131typedef enum { 132 NOT_CONNECTED, READY, WORKING, DOWNLOAD 133} mdc800_state; 134 135 136/* Data for the driver */ 137struct 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 */ 184static struct usb_endpoint_descriptor mdc800_ed [4] = 185{ 186 { 187 .bLength = 0, 188 .bDescriptorType = 0, 189 .bEndpointAddress = 0x01, 190 .bmAttributes = 0x02, 191 .wMaxPacketSize = 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 = 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 = 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 = cpu_to_le16(64), 222 .bInterval = 0, 223 .bRefresh = 0, 224 .bSynchAddress = 0, 225 }, 226}; 227 228/* The Variable used by the driver */ 229static struct mdc800_data* mdc800; 230 231 232/*************************************************************************** 233 The USB Part of the driver 234****************************************************************************/ 235 236static 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 */ 249static 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 */ 265static 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 */ 282static 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 */ 348static 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 dev_err(&mdc800->dev->dev, "timeout waiting for camera.\n"); 359 return -1; 360 } 361 362 if (mdc800->state == NOT_CONNECTED) 363 { 364 printk(KERN_WARNING "mdc800: Camera gets disconnected " 365 "during waiting for irq.\n"); 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 */ 377static void mdc800_usb_write_notify (struct urb *urb) 378{ 379 struct mdc800_data* mdc800=urb->context; 380 int status = urb->status; 381 382 if (status != 0) 383 dev_err(&mdc800->dev->dev, 384 "writing command fails (status=%i)\n", status); 385 else 386 mdc800->state=READY; 387 mdc800->written = 1; 388 wake_up (&mdc800->write_wait); 389} 390 391 392/* 393 * The download_urb callback function 394 */ 395static void mdc800_usb_download_notify (struct urb *urb) 396{ 397 struct mdc800_data* mdc800=urb->context; 398 int status = urb->status; 399 400 if (status == 0) { 401 /* Fill output buffer with these data */ 402 memcpy (mdc800->out, urb->transfer_buffer, 64); 403 mdc800->out_count=64; 404 mdc800->out_ptr=0; 405 mdc800->download_left-=64; 406 if (mdc800->download_left == 0) 407 { 408 mdc800->state=READY; 409 } 410 } else { 411 dev_err(&mdc800->dev->dev, 412 "request bytes fails (status:%i)\n", status); 413 } 414 mdc800->downloaded = 1; 415 wake_up (&mdc800->download_wait); 416} 417 418 419/*************************************************************************** 420 Probing for the Camera 421 ***************************************************************************/ 422 423static struct usb_driver mdc800_usb_driver; 424static const struct file_operations mdc800_device_ops; 425static struct usb_class_driver mdc800_class = { 426 .name = "mdc800%d", 427 .fops = &mdc800_device_ops, 428 .minor_base = MDC800_DEVICE_MINOR_BASE, 429}; 430 431 432/* 433 * Callback to search the Mustek MDC800 on the USB Bus 434 */ 435static int mdc800_usb_probe (struct usb_interface *intf, 436 const struct usb_device_id *id) 437{ 438 int i,j; 439 struct usb_host_interface *intf_desc; 440 struct usb_device *dev = interface_to_usbdev (intf); 441 int irq_interval=0; 442 int retval; 443 444 dbg ("(mdc800_usb_probe) called."); 445 446 447 if (mdc800->dev != NULL) 448 { 449 dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n"); 450 return -ENODEV; 451 } 452 453 if (dev->descriptor.bNumConfigurations != 1) 454 { 455 dev_err(&intf->dev, 456 "probe fails -> wrong Number of Configuration\n"); 457 return -ENODEV; 458 } 459 intf_desc = intf->cur_altsetting; 460 461 if ( 462 ( intf_desc->desc.bInterfaceClass != 0xff ) 463 || ( intf_desc->desc.bInterfaceSubClass != 0 ) 464 || ( intf_desc->desc.bInterfaceProtocol != 0 ) 465 || ( intf_desc->desc.bNumEndpoints != 4) 466 ) 467 { 468 dev_err(&intf->dev, "probe fails -> wrong Interface\n"); 469 return -ENODEV; 470 } 471 472 /* Check the Endpoints */ 473 for (i=0; i<4; i++) 474 { 475 mdc800->endpoint[i]=-1; 476 for (j=0; j<4; j++) 477 { 478 if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i])) 479 { 480 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ; 481 if (i==1) 482 { 483 irq_interval=intf_desc->endpoint [j].desc.bInterval; 484 } 485 } 486 } 487 if (mdc800->endpoint[i] == -1) 488 { 489 dev_err(&intf->dev, "probe fails -> Wrong Endpoints.\n"); 490 return -ENODEV; 491 } 492 } 493 494 495 dev_info(&intf->dev, "Found Mustek MDC800 on USB.\n"); 496 497 mutex_lock(&mdc800->io_lock); 498 499 retval = usb_register_dev(intf, &mdc800_class); 500 if (retval) { 501 dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 502 mutex_unlock(&mdc800->io_lock); 503 return -ENODEV; 504 } 505 506 mdc800->dev=dev; 507 mdc800->open=0; 508 509 /* Setup URB Structs */ 510 usb_fill_int_urb ( 511 mdc800->irq_urb, 512 mdc800->dev, 513 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]), 514 mdc800->irq_urb_buffer, 515 8, 516 mdc800_usb_irq, 517 mdc800, 518 irq_interval 519 ); 520 521 usb_fill_bulk_urb ( 522 mdc800->write_urb, 523 mdc800->dev, 524 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]), 525 mdc800->write_urb_buffer, 526 8, 527 mdc800_usb_write_notify, 528 mdc800 529 ); 530 531 usb_fill_bulk_urb ( 532 mdc800->download_urb, 533 mdc800->dev, 534 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]), 535 mdc800->download_urb_buffer, 536 64, 537 mdc800_usb_download_notify, 538 mdc800 539 ); 540 541 mdc800->state=READY; 542 543 mutex_unlock(&mdc800->io_lock); 544 545 usb_set_intfdata(intf, mdc800); 546 return 0; 547} 548 549 550/* 551 * Disconnect USB device (maybe the MDC800) 552 */ 553static void mdc800_usb_disconnect (struct usb_interface *intf) 554{ 555 struct mdc800_data* mdc800 = usb_get_intfdata(intf); 556 557 dbg ("(mdc800_usb_disconnect) called"); 558 559 if (mdc800) { 560 if (mdc800->state == NOT_CONNECTED) 561 return; 562 563 usb_deregister_dev(intf, &mdc800_class); 564 565 /* must be under lock to make sure no URB 566 is submitted after usb_kill_urb() */ 567 mutex_lock(&mdc800->io_lock); 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 mutex_unlock(&mdc800->io_lock); 574 575 mdc800->dev = NULL; 576 usb_set_intfdata(intf, NULL); 577 } 578 dev_info(&intf->dev, "Mustek MDC800 disconnected from USB.\n"); 579} 580 581 582/*************************************************************************** 583 The Misc device Part (file_operations) 584****************************************************************************/ 585 586/* 587 * This Function calc the Answersize for a command. 588 */ 589static int mdc800_getAnswerSize (char command) 590{ 591 switch ((unsigned char) command) 592 { 593 case 0x2a: 594 case 0x49: 595 case 0x51: 596 case 0x0d: 597 case 0x20: 598 case 0x07: 599 case 0x01: 600 case 0x25: 601 case 0x00: 602 return 8; 603 604 case 0x05: 605 case 0x3e: 606 return mdc800->pic_len; 607 608 case 0x09: 609 return 4096; 610 611 default: 612 return 0; 613 } 614} 615 616 617/* 618 * Init the device: (1) alloc mem (2) Increase MOD Count .. 619 */ 620static int mdc800_device_open (struct inode* inode, struct file *file) 621{ 622 int retval=0; 623 int errn=0; 624 625 mutex_lock(&mdc800->io_lock); 626 627 if (mdc800->state == NOT_CONNECTED) 628 { 629 errn=-EBUSY; 630 goto error_out; 631 } 632 if (mdc800->open) 633 { 634 errn=-EBUSY; 635 goto error_out; 636 } 637 638 mdc800->in_count=0; 639 mdc800->out_count=0; 640 mdc800->out_ptr=0; 641 mdc800->pic_index=0; 642 mdc800->pic_len=-1; 643 mdc800->download_left=0; 644 645 mdc800->camera_busy=0; 646 mdc800->camera_request_ready=0; 647 648 retval=0; 649 mdc800->irq_urb->dev = mdc800->dev; 650 retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL); 651 if (retval) { 652 dev_err(&mdc800->dev->dev, 653 "request USB irq fails (submit_retval=%i).\n", retval); 654 errn = -EIO; 655 goto error_out; 656 } 657 658 mdc800->open=1; 659 dbg ("Mustek MDC800 device opened."); 660 661error_out: 662 mutex_unlock(&mdc800->io_lock); 663 return errn; 664} 665 666 667/* 668 * Close the Camera and release Memory 669 */ 670static int mdc800_device_release (struct inode* inode, struct file *file) 671{ 672 int retval=0; 673 dbg ("Mustek MDC800 device closed."); 674 675 mutex_lock(&mdc800->io_lock); 676 if (mdc800->open && (mdc800->state != NOT_CONNECTED)) 677 { 678 usb_kill_urb(mdc800->irq_urb); 679 usb_kill_urb(mdc800->write_urb); 680 usb_kill_urb(mdc800->download_urb); 681 mdc800->open=0; 682 } 683 else 684 { 685 retval=-EIO; 686 } 687 688 mutex_unlock(&mdc800->io_lock); 689 return retval; 690} 691 692 693/* 694 * The Device read callback Function 695 */ 696static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos) 697{ 698 size_t left=len, sts=len; /* single transfer size */ 699 char __user *ptr = buf; 700 int retval; 701 702 mutex_lock(&mdc800->io_lock); 703 if (mdc800->state == NOT_CONNECTED) 704 { 705 mutex_unlock(&mdc800->io_lock); 706 return -EBUSY; 707 } 708 if (mdc800->state == WORKING) 709 { 710 printk(KERN_WARNING "mdc800: Illegal State \"working\"" 711 "reached during read ?!\n"); 712 mutex_unlock(&mdc800->io_lock); 713 return -EBUSY; 714 } 715 if (!mdc800->open) 716 { 717 mutex_unlock(&mdc800->io_lock); 718 return -EBUSY; 719 } 720 721 while (left) 722 { 723 if (signal_pending (current)) 724 { 725 mutex_unlock(&mdc800->io_lock); 726 return -EINTR; 727 } 728 729 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left; 730 731 if (sts <= 0) 732 { 733 /* Too less Data in buffer */ 734 if (mdc800->state == DOWNLOAD) 735 { 736 mdc800->out_count=0; 737 mdc800->out_ptr=0; 738 739 /* Download -> Request new bytes */ 740 mdc800->download_urb->dev = mdc800->dev; 741 retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL); 742 if (retval) { 743 dev_err(&mdc800->dev->dev, 744 "Can't submit download urb " 745 "(retval=%i)\n", retval); 746 mutex_unlock(&mdc800->io_lock); 747 return len-left; 748 } 749 wait_event_timeout(mdc800->download_wait, mdc800->downloaded, 750 TO_DOWNLOAD_GET_READY*HZ/1000); 751 mdc800->downloaded = 0; 752 if (mdc800->download_urb->status != 0) 753 { 754 dev_err(&mdc800->dev->dev, 755 "request download-bytes fails " 756 "(status=%i)\n", 757 mdc800->download_urb->status); 758 mutex_unlock(&mdc800->io_lock); 759 return len-left; 760 } 761 } 762 else 763 { 764 /* No more bytes -> that's an error*/ 765 mutex_unlock(&mdc800->io_lock); 766 return -EIO; 767 } 768 } 769 else 770 { 771 /* Copy Bytes */ 772 if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr], 773 sts)) { 774 mutex_unlock(&mdc800->io_lock); 775 return -EFAULT; 776 } 777 ptr+=sts; 778 left-=sts; 779 mdc800->out_ptr+=sts; 780 } 781 } 782 783 mutex_unlock(&mdc800->io_lock); 784 return len-left; 785} 786 787 788/* 789 * The Device write callback Function 790 * If a 8Byte Command is received, it will be send to the camera. 791 * After this the driver initiates the request for the answer or 792 * just waits until the camera becomes ready. 793 */ 794static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos) 795{ 796 size_t i=0; 797 int retval; 798 799 mutex_lock(&mdc800->io_lock); 800 if (mdc800->state != READY) 801 { 802 mutex_unlock(&mdc800->io_lock); 803 return -EBUSY; 804 } 805 if (!mdc800->open ) 806 { 807 mutex_unlock(&mdc800->io_lock); 808 return -EBUSY; 809 } 810 811 while (i<len) 812 { 813 unsigned char c; 814 if (signal_pending (current)) 815 { 816 mutex_unlock(&mdc800->io_lock); 817 return -EINTR; 818 } 819 820 if(get_user(c, buf+i)) 821 { 822 mutex_unlock(&mdc800->io_lock); 823 return -EFAULT; 824 } 825 826 /* check for command start */ 827 if (c == 0x55) 828 { 829 mdc800->in_count=0; 830 mdc800->out_count=0; 831 mdc800->out_ptr=0; 832 mdc800->download_left=0; 833 } 834 835 /* save command byte */ 836 if (mdc800->in_count < 8) 837 { 838 mdc800->in[mdc800->in_count] = c; 839 mdc800->in_count++; 840 } 841 else 842 { 843 mutex_unlock(&mdc800->io_lock); 844 return -EIO; 845 } 846 847 /* Command Buffer full ? -> send it to camera */ 848 if (mdc800->in_count == 8) 849 { 850 int answersize; 851 852 if (mdc800_usb_waitForIRQ (0,TO_GET_READY)) 853 { 854 dev_err(&mdc800->dev->dev, 855 "Camera didn't get ready.\n"); 856 mutex_unlock(&mdc800->io_lock); 857 return -EIO; 858 } 859 860 answersize=mdc800_getAnswerSize (mdc800->in[1]); 861 862 mdc800->state=WORKING; 863 memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8); 864 mdc800->write_urb->dev = mdc800->dev; 865 retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL); 866 if (retval) { 867 dev_err(&mdc800->dev->dev, 868 "submitting write urb fails " 869 "(retval=%i)\n", retval); 870 mutex_unlock(&mdc800->io_lock); 871 return -EIO; 872 } 873 wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000); 874 mdc800->written = 0; 875 if (mdc800->state == WORKING) 876 { 877 usb_kill_urb(mdc800->write_urb); 878 mutex_unlock(&mdc800->io_lock); 879 return -EIO; 880 } 881 882 switch ((unsigned char) mdc800->in[1]) 883 { 884 case 0x05: /* Download Image */ 885 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */ 886 if (mdc800->pic_len < 0) 887 { 888 dev_err(&mdc800->dev->dev, 889 "call 0x07 before " 890 "0x05,0x3e\n"); 891 mdc800->state=READY; 892 mutex_unlock(&mdc800->io_lock); 893 return -EIO; 894 } 895 mdc800->pic_len=-1; 896 897 case 0x09: /* Download Thumbnail */ 898 mdc800->download_left=answersize+64; 899 mdc800->state=DOWNLOAD; 900 mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY); 901 break; 902 903 904 default: 905 if (answersize) 906 { 907 908 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ)) 909 { 910 dev_err(&mdc800->dev->dev, "requesting answer from irq fails\n"); 911 mutex_unlock(&mdc800->io_lock); 912 return -EIO; 913 } 914 915 /* Write dummy data, (this is ugly but part of the USB Protocol */ 916 /* if you use endpoint 1 as bulk and not as irq) */ 917 memcpy (mdc800->out, mdc800->camera_response,8); 918 919 /* This is the interpreted answer */ 920 memcpy (&mdc800->out[8], mdc800->camera_response,8); 921 922 mdc800->out_ptr=0; 923 mdc800->out_count=16; 924 925 /* Cache the Imagesize, if command was getImageSize */ 926 if (mdc800->in [1] == (char) 0x07) 927 { 928 mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2]; 929 930 dbg ("cached imagesize = %i",mdc800->pic_len); 931 } 932 933 } 934 else 935 { 936 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND)) 937 { 938 dev_err(&mdc800->dev->dev, "Command Timeout.\n"); 939 mutex_unlock(&mdc800->io_lock); 940 return -EIO; 941 } 942 } 943 mdc800->state=READY; 944 break; 945 } 946 } 947 i++; 948 } 949 mutex_unlock(&mdc800->io_lock); 950 return i; 951} 952 953 954/*************************************************************************** 955 Init and Cleanup this driver (Structs and types) 956****************************************************************************/ 957 958/* File Operations of this drivers */ 959static const struct file_operations mdc800_device_ops = 960{ 961 .owner = THIS_MODULE, 962 .read = mdc800_device_read, 963 .write = mdc800_device_write, 964 .open = mdc800_device_open, 965 .release = mdc800_device_release, 966 .llseek = noop_llseek, 967}; 968 969 970 971static const struct usb_device_id mdc800_table[] = { 972 { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) }, 973 { } /* Terminating entry */ 974}; 975 976MODULE_DEVICE_TABLE (usb, mdc800_table); 977/* 978 * USB Driver Struct for this device 979 */ 980static struct usb_driver mdc800_usb_driver = 981{ 982 .name = "mdc800", 983 .probe = mdc800_usb_probe, 984 .disconnect = mdc800_usb_disconnect, 985 .id_table = mdc800_table 986}; 987 988 989 990/************************************************************************ 991 Init and Cleanup this driver (Main Functions) 992*************************************************************************/ 993 994static int __init usb_mdc800_init (void) 995{ 996 int retval = -ENODEV; 997 /* Allocate Memory */ 998 mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL); 999 if (!mdc800) 1000 goto cleanup_on_fail; 1001 1002 mdc800->dev = NULL; 1003 mdc800->state=NOT_CONNECTED; 1004 mutex_init (&mdc800->io_lock); 1005 1006 init_waitqueue_head (&mdc800->irq_wait); 1007 init_waitqueue_head (&mdc800->write_wait); 1008 init_waitqueue_head (&mdc800->download_wait); 1009 1010 mdc800->irq_woken = 0; 1011 mdc800->downloaded = 0; 1012 mdc800->written = 0; 1013 1014 mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL); 1015 if (!mdc800->irq_urb_buffer) 1016 goto cleanup_on_fail; 1017 mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL); 1018 if (!mdc800->write_urb_buffer) 1019 goto cleanup_on_fail; 1020 mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL); 1021 if (!mdc800->download_urb_buffer) 1022 goto cleanup_on_fail; 1023 1024 mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL); 1025 if (!mdc800->irq_urb) 1026 goto cleanup_on_fail; 1027 mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL); 1028 if (!mdc800->download_urb) 1029 goto cleanup_on_fail; 1030 mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL); 1031 if (!mdc800->write_urb) 1032 goto cleanup_on_fail; 1033 1034 /* Register the driver */ 1035 retval = usb_register(&mdc800_usb_driver); 1036 if (retval) 1037 goto cleanup_on_fail; 1038 1039 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 1040 DRIVER_DESC "\n"); 1041 1042 return 0; 1043 1044 /* Clean driver up, when something fails */ 1045 1046cleanup_on_fail: 1047 1048 if (mdc800 != NULL) 1049 { 1050 printk(KERN_ERR "mdc800: can't alloc memory!\n"); 1051 1052 kfree(mdc800->download_urb_buffer); 1053 kfree(mdc800->write_urb_buffer); 1054 kfree(mdc800->irq_urb_buffer); 1055 1056 usb_free_urb(mdc800->write_urb); 1057 usb_free_urb(mdc800->download_urb); 1058 usb_free_urb(mdc800->irq_urb); 1059 1060 kfree (mdc800); 1061 } 1062 mdc800 = NULL; 1063 return retval; 1064} 1065 1066 1067static void __exit usb_mdc800_cleanup (void) 1068{ 1069 usb_deregister (&mdc800_usb_driver); 1070 1071 usb_free_urb (mdc800->irq_urb); 1072 usb_free_urb (mdc800->download_urb); 1073 usb_free_urb (mdc800->write_urb); 1074 1075 kfree (mdc800->irq_urb_buffer); 1076 kfree (mdc800->write_urb_buffer); 1077 kfree (mdc800->download_urb_buffer); 1078 1079 kfree (mdc800); 1080 mdc800 = NULL; 1081} 1082 1083module_init (usb_mdc800_init); 1084module_exit (usb_mdc800_cleanup); 1085 1086MODULE_AUTHOR( DRIVER_AUTHOR ); 1087MODULE_DESCRIPTION( DRIVER_DESC ); 1088MODULE_LICENSE("GPL"); 1089 1090