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 disconnect 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 = 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 */ 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 struct device *dev = &mdc800->dev->dev; 288 int status = urb->status; 289 290 if (status >= 0) { 291 if (mdc800_isBusy (b)) 292 { 293 if (!mdc800->camera_busy) 294 { 295 mdc800->camera_busy=1; 296 dev_dbg(dev, "gets busy\n"); 297 } 298 } 299 else 300 { 301 if (mdc800->camera_busy && mdc800_isReady (b)) 302 { 303 mdc800->camera_busy=0; 304 dev_dbg(dev, "gets ready\n"); 305 } 306 } 307 if (!(mdc800_isBusy (b) || mdc800_isReady (b))) 308 { 309 /* Store Data in camera_answer field */ 310 dev_dbg(dev, "%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]); 311 312 memcpy (mdc800->camera_response,b,8); 313 data_received=1; 314 } 315 } 316 wake_up= ( mdc800->camera_request_ready > 0 ) 317 && 318 ( 319 ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy)) 320 || 321 ((mdc800->camera_request_ready == 2) && data_received) 322 || 323 ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy)) 324 || 325 (status < 0) 326 ); 327 328 if (wake_up) 329 { 330 mdc800->camera_request_ready=0; 331 mdc800->irq_woken=1; 332 wake_up (&mdc800->irq_wait); 333 } 334 } 335 336 337 /* 338 * Waits a while until the irq responds that camera is ready 339 * 340 * mode : 0: Wait for camera gets ready 341 * 1: Wait for receiving data 342 * 2: Wait for camera gets busy 343 * 344 * msec: Time to wait 345 */ 346 static int mdc800_usb_waitForIRQ (int mode, int msec) 347 { 348 mdc800->camera_request_ready=1+mode; 349 350 wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000); 351 mdc800->irq_woken = 0; 352 353 if (mdc800->camera_request_ready>0) 354 { 355 mdc800->camera_request_ready=0; 356 dev_err(&mdc800->dev->dev, "timeout waiting for camera.\n"); 357 return -1; 358 } 359 360 if (mdc800->state == NOT_CONNECTED) 361 { 362 printk(KERN_WARNING "mdc800: Camera gets disconnected " 363 "during waiting for irq.\n"); 364 mdc800->camera_request_ready=0; 365 return -2; 366 } 367 368 return 0; 369 } 370 371 372 /* 373 * The write_urb callback function 374 */ 375 static void mdc800_usb_write_notify (struct urb *urb) 376 { 377 struct mdc800_data* mdc800=urb->context; 378 int status = urb->status; 379 380 if (status != 0) 381 dev_err(&mdc800->dev->dev, 382 "writing command fails (status=%i)\n", 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 dev_err(&mdc800->dev->dev, 410 "request bytes fails (status:%i)\n", status); 411 } 412 mdc800->downloaded = 1; 413 wake_up (&mdc800->download_wait); 414 } 415 416 417 /*************************************************************************** 418 Probing for the Camera 419 ***************************************************************************/ 420 421 static struct usb_driver mdc800_usb_driver; 422 static const struct file_operations mdc800_device_ops; 423 static struct usb_class_driver mdc800_class = { 424 .name = "mdc800%d", 425 .fops = &mdc800_device_ops, 426 .minor_base = MDC800_DEVICE_MINOR_BASE, 427 }; 428 429 430 /* 431 * Callback to search the Mustek MDC800 on the USB Bus 432 */ 433 static int mdc800_usb_probe (struct usb_interface *intf, 434 const struct usb_device_id *id) 435 { 436 int i,j; 437 struct usb_host_interface *intf_desc; 438 struct usb_device *dev = interface_to_usbdev (intf); 439 int irq_interval=0; 440 int retval; 441 442 dev_dbg(&intf->dev, "(%s) called.\n", __func__); 443 444 445 if (mdc800->dev != NULL) 446 { 447 dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n"); 448 return -ENODEV; 449 } 450 451 if (dev->descriptor.bNumConfigurations != 1) 452 { 453 dev_err(&intf->dev, 454 "probe fails -> wrong Number of Configuration\n"); 455 return -ENODEV; 456 } 457 intf_desc = intf->cur_altsetting; 458 459 if ( 460 ( intf_desc->desc.bInterfaceClass != 0xff ) 461 || ( intf_desc->desc.bInterfaceSubClass != 0 ) 462 || ( intf_desc->desc.bInterfaceProtocol != 0 ) 463 || ( intf_desc->desc.bNumEndpoints != 4) 464 ) 465 { 466 dev_err(&intf->dev, "probe fails -> wrong Interface\n"); 467 return -ENODEV; 468 } 469 470 /* Check the Endpoints */ 471 for (i=0; i<4; i++) 472 { 473 mdc800->endpoint[i]=-1; 474 for (j=0; j<4; j++) 475 { 476 if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i])) 477 { 478 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ; 479 if (i==1) 480 { 481 irq_interval=intf_desc->endpoint [j].desc.bInterval; 482 } 483 } 484 } 485 if (mdc800->endpoint[i] == -1) 486 { 487 dev_err(&intf->dev, "probe fails -> Wrong Endpoints.\n"); 488 return -ENODEV; 489 } 490 } 491 492 493 dev_info(&intf->dev, "Found Mustek MDC800 on USB.\n"); 494 495 mutex_lock(&mdc800->io_lock); 496 497 retval = usb_register_dev(intf, &mdc800_class); 498 if (retval) { 499 dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 500 mutex_unlock(&mdc800->io_lock); 501 return -ENODEV; 502 } 503 504 mdc800->dev=dev; 505 mdc800->open=0; 506 507 /* Setup URB Structs */ 508 usb_fill_int_urb ( 509 mdc800->irq_urb, 510 mdc800->dev, 511 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]), 512 mdc800->irq_urb_buffer, 513 8, 514 mdc800_usb_irq, 515 mdc800, 516 irq_interval 517 ); 518 519 usb_fill_bulk_urb ( 520 mdc800->write_urb, 521 mdc800->dev, 522 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]), 523 mdc800->write_urb_buffer, 524 8, 525 mdc800_usb_write_notify, 526 mdc800 527 ); 528 529 usb_fill_bulk_urb ( 530 mdc800->download_urb, 531 mdc800->dev, 532 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]), 533 mdc800->download_urb_buffer, 534 64, 535 mdc800_usb_download_notify, 536 mdc800 537 ); 538 539 mdc800->state=READY; 540 541 mutex_unlock(&mdc800->io_lock); 542 543 usb_set_intfdata(intf, mdc800); 544 return 0; 545 } 546 547 548 /* 549 * Disconnect USB device (maybe the MDC800) 550 */ 551 static void mdc800_usb_disconnect (struct usb_interface *intf) 552 { 553 struct mdc800_data* mdc800 = usb_get_intfdata(intf); 554 555 dev_dbg(&intf->dev, "(%s) called\n", __func__); 556 557 if (mdc800) { 558 if (mdc800->state == NOT_CONNECTED) 559 return; 560 561 usb_deregister_dev(intf, &mdc800_class); 562 563 /* must be under lock to make sure no URB 564 is submitted after usb_kill_urb() */ 565 mutex_lock(&mdc800->io_lock); 566 mdc800->state=NOT_CONNECTED; 567 568 usb_kill_urb(mdc800->irq_urb); 569 usb_kill_urb(mdc800->write_urb); 570 usb_kill_urb(mdc800->download_urb); 571 mutex_unlock(&mdc800->io_lock); 572 573 mdc800->dev = NULL; 574 usb_set_intfdata(intf, NULL); 575 } 576 dev_info(&intf->dev, "Mustek MDC800 disconnected from USB.\n"); 577 } 578 579 580 /*************************************************************************** 581 The Misc device Part (file_operations) 582 ****************************************************************************/ 583 584 /* 585 * This Function calc the Answersize for a command. 586 */ 587 static int mdc800_getAnswerSize (char command) 588 { 589 switch ((unsigned char) command) 590 { 591 case 0x2a: 592 case 0x49: 593 case 0x51: 594 case 0x0d: 595 case 0x20: 596 case 0x07: 597 case 0x01: 598 case 0x25: 599 case 0x00: 600 return 8; 601 602 case 0x05: 603 case 0x3e: 604 return mdc800->pic_len; 605 606 case 0x09: 607 return 4096; 608 609 default: 610 return 0; 611 } 612 } 613 614 615 /* 616 * Init the device: (1) alloc mem (2) Increase MOD Count .. 617 */ 618 static int mdc800_device_open (struct inode* inode, struct file *file) 619 { 620 int retval=0; 621 int errn=0; 622 623 mutex_lock(&mdc800->io_lock); 624 625 if (mdc800->state == NOT_CONNECTED) 626 { 627 errn=-EBUSY; 628 goto error_out; 629 } 630 if (mdc800->open) 631 { 632 errn=-EBUSY; 633 goto error_out; 634 } 635 636 mdc800->in_count=0; 637 mdc800->out_count=0; 638 mdc800->out_ptr=0; 639 mdc800->pic_index=0; 640 mdc800->pic_len=-1; 641 mdc800->download_left=0; 642 643 mdc800->camera_busy=0; 644 mdc800->camera_request_ready=0; 645 646 retval=0; 647 mdc800->irq_urb->dev = mdc800->dev; 648 retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL); 649 if (retval) { 650 dev_err(&mdc800->dev->dev, 651 "request USB irq fails (submit_retval=%i).\n", retval); 652 errn = -EIO; 653 goto error_out; 654 } 655 656 mdc800->open=1; 657 dev_dbg(&mdc800->dev->dev, "Mustek MDC800 device opened.\n"); 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; 671 672 mutex_lock(&mdc800->io_lock); 673 if (mdc800->open && (mdc800->state != NOT_CONNECTED)) 674 { 675 usb_kill_urb(mdc800->irq_urb); 676 usb_kill_urb(mdc800->write_urb); 677 usb_kill_urb(mdc800->download_urb); 678 mdc800->open=0; 679 } 680 else 681 { 682 retval=-EIO; 683 } 684 685 mutex_unlock(&mdc800->io_lock); 686 return retval; 687 } 688 689 690 /* 691 * The Device read callback Function 692 */ 693 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos) 694 { 695 size_t left=len, sts=len; /* single transfer size */ 696 char __user *ptr = buf; 697 int retval; 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 printk(KERN_WARNING "mdc800: Illegal State \"working\"" 708 "reached during read ?!\n"); 709 mutex_unlock(&mdc800->io_lock); 710 return -EBUSY; 711 } 712 if (!mdc800->open) 713 { 714 mutex_unlock(&mdc800->io_lock); 715 return -EBUSY; 716 } 717 718 while (left) 719 { 720 if (signal_pending (current)) 721 { 722 mutex_unlock(&mdc800->io_lock); 723 return -EINTR; 724 } 725 726 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left; 727 728 if (sts <= 0) 729 { 730 /* Too less Data in buffer */ 731 if (mdc800->state == DOWNLOAD) 732 { 733 mdc800->out_count=0; 734 mdc800->out_ptr=0; 735 736 /* Download -> Request new bytes */ 737 mdc800->download_urb->dev = mdc800->dev; 738 retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL); 739 if (retval) { 740 dev_err(&mdc800->dev->dev, 741 "Can't submit download urb " 742 "(retval=%i)\n", retval); 743 mutex_unlock(&mdc800->io_lock); 744 return len-left; 745 } 746 wait_event_timeout(mdc800->download_wait, mdc800->downloaded, 747 TO_DOWNLOAD_GET_READY*HZ/1000); 748 mdc800->downloaded = 0; 749 if (mdc800->download_urb->status != 0) 750 { 751 dev_err(&mdc800->dev->dev, 752 "request download-bytes fails " 753 "(status=%i)\n", 754 mdc800->download_urb->status); 755 mutex_unlock(&mdc800->io_lock); 756 return len-left; 757 } 758 } 759 else 760 { 761 /* No more bytes -> that's an error*/ 762 mutex_unlock(&mdc800->io_lock); 763 return -EIO; 764 } 765 } 766 else 767 { 768 /* Copy Bytes */ 769 if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr], 770 sts)) { 771 mutex_unlock(&mdc800->io_lock); 772 return -EFAULT; 773 } 774 ptr+=sts; 775 left-=sts; 776 mdc800->out_ptr+=sts; 777 } 778 } 779 780 mutex_unlock(&mdc800->io_lock); 781 return len-left; 782 } 783 784 785 /* 786 * The Device write callback Function 787 * If a 8Byte Command is received, it will be send to the camera. 788 * After this the driver initiates the request for the answer or 789 * just waits until the camera becomes ready. 790 */ 791 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos) 792 { 793 size_t i=0; 794 int retval; 795 796 mutex_lock(&mdc800->io_lock); 797 if (mdc800->state != READY) 798 { 799 mutex_unlock(&mdc800->io_lock); 800 return -EBUSY; 801 } 802 if (!mdc800->open ) 803 { 804 mutex_unlock(&mdc800->io_lock); 805 return -EBUSY; 806 } 807 808 while (i<len) 809 { 810 unsigned char c; 811 if (signal_pending (current)) 812 { 813 mutex_unlock(&mdc800->io_lock); 814 return -EINTR; 815 } 816 817 if(get_user(c, buf+i)) 818 { 819 mutex_unlock(&mdc800->io_lock); 820 return -EFAULT; 821 } 822 823 /* check for command start */ 824 if (c == 0x55) 825 { 826 mdc800->in_count=0; 827 mdc800->out_count=0; 828 mdc800->out_ptr=0; 829 mdc800->download_left=0; 830 } 831 832 /* save command byte */ 833 if (mdc800->in_count < 8) 834 { 835 mdc800->in[mdc800->in_count] = c; 836 mdc800->in_count++; 837 } 838 else 839 { 840 mutex_unlock(&mdc800->io_lock); 841 return -EIO; 842 } 843 844 /* Command Buffer full ? -> send it to camera */ 845 if (mdc800->in_count == 8) 846 { 847 int answersize; 848 849 if (mdc800_usb_waitForIRQ (0,TO_GET_READY)) 850 { 851 dev_err(&mdc800->dev->dev, 852 "Camera didn't get ready.\n"); 853 mutex_unlock(&mdc800->io_lock); 854 return -EIO; 855 } 856 857 answersize=mdc800_getAnswerSize (mdc800->in[1]); 858 859 mdc800->state=WORKING; 860 memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8); 861 mdc800->write_urb->dev = mdc800->dev; 862 retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL); 863 if (retval) { 864 dev_err(&mdc800->dev->dev, 865 "submitting write urb fails " 866 "(retval=%i)\n", retval); 867 mutex_unlock(&mdc800->io_lock); 868 return -EIO; 869 } 870 wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000); 871 mdc800->written = 0; 872 if (mdc800->state == WORKING) 873 { 874 usb_kill_urb(mdc800->write_urb); 875 mutex_unlock(&mdc800->io_lock); 876 return -EIO; 877 } 878 879 switch ((unsigned char) mdc800->in[1]) 880 { 881 case 0x05: /* Download Image */ 882 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */ 883 if (mdc800->pic_len < 0) 884 { 885 dev_err(&mdc800->dev->dev, 886 "call 0x07 before " 887 "0x05,0x3e\n"); 888 mdc800->state=READY; 889 mutex_unlock(&mdc800->io_lock); 890 return -EIO; 891 } 892 mdc800->pic_len=-1; 893 894 case 0x09: /* Download Thumbnail */ 895 mdc800->download_left=answersize+64; 896 mdc800->state=DOWNLOAD; 897 mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY); 898 break; 899 900 901 default: 902 if (answersize) 903 { 904 905 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ)) 906 { 907 dev_err(&mdc800->dev->dev, "requesting answer from irq fails\n"); 908 mutex_unlock(&mdc800->io_lock); 909 return -EIO; 910 } 911 912 /* Write dummy data, (this is ugly but part of the USB Protocol */ 913 /* if you use endpoint 1 as bulk and not as irq) */ 914 memcpy (mdc800->out, mdc800->camera_response,8); 915 916 /* This is the interpreted answer */ 917 memcpy (&mdc800->out[8], mdc800->camera_response,8); 918 919 mdc800->out_ptr=0; 920 mdc800->out_count=16; 921 922 /* Cache the Imagesize, if command was getImageSize */ 923 if (mdc800->in [1] == (char) 0x07) 924 { 925 mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2]; 926 927 dev_dbg(&mdc800->dev->dev, "cached imagesize = %i\n", mdc800->pic_len); 928 } 929 930 } 931 else 932 { 933 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND)) 934 { 935 dev_err(&mdc800->dev->dev, "Command Timeout.\n"); 936 mutex_unlock(&mdc800->io_lock); 937 return -EIO; 938 } 939 } 940 mdc800->state=READY; 941 break; 942 } 943 } 944 i++; 945 } 946 mutex_unlock(&mdc800->io_lock); 947 return i; 948 } 949 950 951 /*************************************************************************** 952 Init and Cleanup this driver (Structs and types) 953 ****************************************************************************/ 954 955 /* File Operations of this drivers */ 956 static const struct file_operations mdc800_device_ops = 957 { 958 .owner = THIS_MODULE, 959 .read = mdc800_device_read, 960 .write = mdc800_device_write, 961 .open = mdc800_device_open, 962 .release = mdc800_device_release, 963 .llseek = noop_llseek, 964 }; 965 966 967 968 static const struct usb_device_id mdc800_table[] = { 969 { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) }, 970 { } /* Terminating entry */ 971 }; 972 973 MODULE_DEVICE_TABLE (usb, mdc800_table); 974 /* 975 * USB Driver Struct for this device 976 */ 977 static struct usb_driver mdc800_usb_driver = 978 { 979 .name = "mdc800", 980 .probe = mdc800_usb_probe, 981 .disconnect = mdc800_usb_disconnect, 982 .id_table = mdc800_table 983 }; 984 985 986 987 /************************************************************************ 988 Init and Cleanup this driver (Main Functions) 989 *************************************************************************/ 990 991 static int __init usb_mdc800_init (void) 992 { 993 int retval = -ENODEV; 994 /* Allocate Memory */ 995 mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL); 996 if (!mdc800) 997 goto cleanup_on_fail; 998 999 mdc800->dev = NULL; 1000 mdc800->state=NOT_CONNECTED; 1001 mutex_init (&mdc800->io_lock); 1002 1003 init_waitqueue_head (&mdc800->irq_wait); 1004 init_waitqueue_head (&mdc800->write_wait); 1005 init_waitqueue_head (&mdc800->download_wait); 1006 1007 mdc800->irq_woken = 0; 1008 mdc800->downloaded = 0; 1009 mdc800->written = 0; 1010 1011 mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL); 1012 if (!mdc800->irq_urb_buffer) 1013 goto cleanup_on_fail; 1014 mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL); 1015 if (!mdc800->write_urb_buffer) 1016 goto cleanup_on_fail; 1017 mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL); 1018 if (!mdc800->download_urb_buffer) 1019 goto cleanup_on_fail; 1020 1021 mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL); 1022 if (!mdc800->irq_urb) 1023 goto cleanup_on_fail; 1024 mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL); 1025 if (!mdc800->download_urb) 1026 goto cleanup_on_fail; 1027 mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL); 1028 if (!mdc800->write_urb) 1029 goto cleanup_on_fail; 1030 1031 /* Register the driver */ 1032 retval = usb_register(&mdc800_usb_driver); 1033 if (retval) 1034 goto cleanup_on_fail; 1035 1036 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 1037 DRIVER_DESC "\n"); 1038 1039 return 0; 1040 1041 /* Clean driver up, when something fails */ 1042 1043 cleanup_on_fail: 1044 1045 if (mdc800 != NULL) 1046 { 1047 printk(KERN_ERR "mdc800: can't alloc memory!\n"); 1048 1049 kfree(mdc800->download_urb_buffer); 1050 kfree(mdc800->write_urb_buffer); 1051 kfree(mdc800->irq_urb_buffer); 1052 1053 usb_free_urb(mdc800->write_urb); 1054 usb_free_urb(mdc800->download_urb); 1055 usb_free_urb(mdc800->irq_urb); 1056 1057 kfree (mdc800); 1058 } 1059 mdc800 = NULL; 1060 return retval; 1061 } 1062 1063 1064 static void __exit usb_mdc800_cleanup (void) 1065 { 1066 usb_deregister (&mdc800_usb_driver); 1067 1068 usb_free_urb (mdc800->irq_urb); 1069 usb_free_urb (mdc800->download_urb); 1070 usb_free_urb (mdc800->write_urb); 1071 1072 kfree (mdc800->irq_urb_buffer); 1073 kfree (mdc800->write_urb_buffer); 1074 kfree (mdc800->download_urb_buffer); 1075 1076 kfree (mdc800); 1077 mdc800 = NULL; 1078 } 1079 1080 module_init (usb_mdc800_init); 1081 module_exit (usb_mdc800_cleanup); 1082 1083 MODULE_AUTHOR( DRIVER_AUTHOR ); 1084 MODULE_DESCRIPTION( DRIVER_DESC ); 1085 MODULE_LICENSE("GPL"); 1086 1087