1 /** 2 * Generic USB driver for report based interrupt in/out devices 3 * like LD Didactic's USB devices. LD Didactic's USB devices are 4 * HID devices which do not use HID report definitons (they use 5 * raw interrupt in and our reports only for communication). 6 * 7 * This driver uses a ring buffer for time critical reading of 8 * interrupt in reports and provides read and write methods for 9 * raw interrupt reports (similar to the Windows HID driver). 10 * Devices based on the book USB COMPLETE by Jan Axelson may need 11 * such a compatibility to the Windows HID driver. 12 * 13 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License as 17 * published by the Free Software Foundation; either version 2 of 18 * the License, or (at your option) any later version. 19 * 20 * Derived from Lego USB Tower driver 21 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> 22 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 23 * 24 * V0.1 (mh) Initial version 25 * V0.11 (mh) Added raw support for HID 1.0 devices (no interrupt out endpoint) 26 */ 27 28 #include <linux/config.h> 29 #include <linux/kernel.h> 30 #include <linux/errno.h> 31 #include <linux/init.h> 32 #include <linux/slab.h> 33 #include <linux/module.h> 34 35 #include <asm/uaccess.h> 36 #include <linux/input.h> 37 #include <linux/usb.h> 38 #include <linux/poll.h> 39 40 /* Define these values to match your devices */ 41 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */ 42 #define USB_DEVICE_ID_CASSY 0x1000 /* USB Product ID for all CASSY-S modules */ 43 #define USB_DEVICE_ID_POCKETCASSY 0x1010 /* USB Product ID for Pocket-CASSY */ 44 #define USB_DEVICE_ID_MOBILECASSY 0x1020 /* USB Product ID for Mobile-CASSY */ 45 #define USB_DEVICE_ID_JWM 0x1080 /* USB Product ID for Joule and Wattmeter */ 46 #define USB_DEVICE_ID_DMMP 0x1081 /* USB Product ID for Digital Multimeter P (reserved) */ 47 #define USB_DEVICE_ID_UMIP 0x1090 /* USB Product ID for UMI P */ 48 #define USB_DEVICE_ID_VIDEOCOM 0x1200 /* USB Product ID for VideoCom */ 49 #define USB_DEVICE_ID_COM3LAB 0x2000 /* USB Product ID for COM3LAB */ 50 #define USB_DEVICE_ID_TELEPORT 0x2010 /* USB Product ID for Terminal Adapter */ 51 #define USB_DEVICE_ID_NETWORKANALYSER 0x2020 /* USB Product ID for Network Analyser */ 52 #define USB_DEVICE_ID_POWERCONTROL 0x2030 /* USB Product ID for Controlling device for Power Electronics */ 53 54 #define USB_VENDOR_ID_VERNIER 0x08f7 55 #define USB_DEVICE_ID_VERNIER_LABPRO 0x0001 56 #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002 57 #define USB_DEVICE_ID_VERNIER_SKIP 0x0003 58 #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004 59 60 61 #ifdef CONFIG_USB_DYNAMIC_MINORS 62 #define USB_LD_MINOR_BASE 0 63 #else 64 #define USB_LD_MINOR_BASE 176 65 #endif 66 67 /* table of devices that work with this driver */ 68 static struct usb_device_id ld_usb_table [] = { 69 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_CASSY) }, 70 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_POCKETCASSY) }, 71 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_MOBILECASSY) }, 72 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_JWM) }, 73 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_DMMP) }, 74 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_UMIP) }, 75 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_VIDEOCOM) }, 76 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_COM3LAB) }, 77 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_TELEPORT) }, 78 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_NETWORKANALYSER) }, 79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_POWERCONTROL) }, 80 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) }, 81 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) }, 82 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) }, 83 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) }, 84 { } /* Terminating entry */ 85 }; 86 MODULE_DEVICE_TABLE(usb, ld_usb_table); 87 MODULE_VERSION("V0.11"); 88 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); 89 MODULE_DESCRIPTION("LD USB Driver"); 90 MODULE_LICENSE("GPL"); 91 MODULE_SUPPORTED_DEVICE("LD USB Devices"); 92 93 #ifdef CONFIG_USB_DEBUG 94 static int debug = 1; 95 #else 96 static int debug = 0; 97 #endif 98 99 /* Use our own dbg macro */ 100 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0) 101 102 /* Module parameters */ 103 module_param(debug, int, S_IRUGO | S_IWUSR); 104 MODULE_PARM_DESC(debug, "Debug enabled or not"); 105 106 /* All interrupt in transfers are collected in a ring buffer to 107 * avoid racing conditions and get better performance of the driver. 108 */ 109 static int ring_buffer_size = 128; 110 module_param(ring_buffer_size, int, 0); 111 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); 112 113 /* The write_buffer can contain more than one interrupt out transfer. 114 */ 115 static int write_buffer_size = 10; 116 module_param(write_buffer_size, int, 0); 117 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); 118 119 /* As of kernel version 2.6.4 ehci-hcd uses an 120 * "only one interrupt transfer per frame" shortcut 121 * to simplify the scheduling of periodic transfers. 122 * This conflicts with our standard 1ms intervals for in and out URBs. 123 * We use default intervals of 2ms for in and 2ms for out transfers, 124 * which should be fast enough. 125 * Increase the interval to allow more devices that do interrupt transfers, 126 * or set to 1 to use the standard interval from the endpoint descriptors. 127 */ 128 static int min_interrupt_in_interval = 2; 129 module_param(min_interrupt_in_interval, int, 0); 130 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); 131 132 static int min_interrupt_out_interval = 2; 133 module_param(min_interrupt_out_interval, int, 0); 134 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); 135 136 /* Structure to hold all of our device specific stuff */ 137 struct ld_usb { 138 struct semaphore sem; /* locks this structure */ 139 struct usb_interface* intf; /* save off the usb interface pointer */ 140 141 int open_count; /* number of times this port has been opened */ 142 143 char* ring_buffer; 144 unsigned int ring_head; 145 unsigned int ring_tail; 146 147 wait_queue_head_t read_wait; 148 wait_queue_head_t write_wait; 149 150 char* interrupt_in_buffer; 151 struct usb_endpoint_descriptor* interrupt_in_endpoint; 152 struct urb* interrupt_in_urb; 153 int interrupt_in_interval; 154 size_t interrupt_in_endpoint_size; 155 int interrupt_in_running; 156 int interrupt_in_done; 157 158 char* interrupt_out_buffer; 159 struct usb_endpoint_descriptor* interrupt_out_endpoint; 160 struct urb* interrupt_out_urb; 161 int interrupt_out_interval; 162 size_t interrupt_out_endpoint_size; 163 int interrupt_out_busy; 164 }; 165 166 /* prevent races between open() and disconnect() */ 167 static DECLARE_MUTEX(disconnect_sem); 168 169 static struct usb_driver ld_usb_driver; 170 171 /** 172 * ld_usb_abort_transfers 173 * aborts transfers and frees associated data structures 174 */ 175 static void ld_usb_abort_transfers(struct ld_usb *dev) 176 { 177 /* shutdown transfer */ 178 if (dev->interrupt_in_running) { 179 dev->interrupt_in_running = 0; 180 if (dev->intf) 181 usb_kill_urb(dev->interrupt_in_urb); 182 } 183 if (dev->interrupt_out_busy) 184 if (dev->intf) 185 usb_kill_urb(dev->interrupt_out_urb); 186 } 187 188 /** 189 * ld_usb_delete 190 */ 191 static void ld_usb_delete(struct ld_usb *dev) 192 { 193 ld_usb_abort_transfers(dev); 194 195 /* free data structures */ 196 usb_free_urb(dev->interrupt_in_urb); 197 usb_free_urb(dev->interrupt_out_urb); 198 kfree(dev->ring_buffer); 199 kfree(dev->interrupt_in_buffer); 200 kfree(dev->interrupt_out_buffer); 201 kfree(dev); 202 } 203 204 /** 205 * ld_usb_interrupt_in_callback 206 */ 207 static void ld_usb_interrupt_in_callback(struct urb *urb, struct pt_regs *regs) 208 { 209 struct ld_usb *dev = urb->context; 210 size_t *actual_buffer; 211 unsigned int next_ring_head; 212 int retval; 213 214 if (urb->status) { 215 if (urb->status == -ENOENT || 216 urb->status == -ECONNRESET || 217 urb->status == -ESHUTDOWN) { 218 goto exit; 219 } else { 220 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n", 221 __FUNCTION__, urb->status); 222 goto resubmit; /* maybe we can recover */ 223 } 224 } 225 226 if (urb->actual_length > 0) { 227 next_ring_head = (dev->ring_head+1) % ring_buffer_size; 228 if (next_ring_head != dev->ring_tail) { 229 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 230 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ 231 *actual_buffer = urb->actual_length; 232 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); 233 dev->ring_head = next_ring_head; 234 dbg_info(&dev->intf->dev, "%s: received %d bytes\n", 235 __FUNCTION__, urb->actual_length); 236 } else 237 dev_warn(&dev->intf->dev, 238 "Ring buffer overflow, %d bytes dropped\n", 239 urb->actual_length); 240 } 241 242 resubmit: 243 /* resubmit if we're still running */ 244 if (dev->interrupt_in_running && dev->intf) { 245 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 246 if (retval) 247 dev_err(&dev->intf->dev, 248 "usb_submit_urb failed (%d)\n", retval); 249 } 250 251 exit: 252 dev->interrupt_in_done = 1; 253 wake_up_interruptible(&dev->read_wait); 254 } 255 256 /** 257 * ld_usb_interrupt_out_callback 258 */ 259 static void ld_usb_interrupt_out_callback(struct urb *urb, struct pt_regs *regs) 260 { 261 struct ld_usb *dev = urb->context; 262 263 /* sync/async unlink faults aren't errors */ 264 if (urb->status && !(urb->status == -ENOENT || 265 urb->status == -ECONNRESET || 266 urb->status == -ESHUTDOWN)) 267 dbg_info(&dev->intf->dev, 268 "%s - nonzero write interrupt status received: %d\n", 269 __FUNCTION__, urb->status); 270 271 dev->interrupt_out_busy = 0; 272 wake_up_interruptible(&dev->write_wait); 273 } 274 275 /** 276 * ld_usb_open 277 */ 278 static int ld_usb_open(struct inode *inode, struct file *file) 279 { 280 struct ld_usb *dev; 281 int subminor; 282 int retval = 0; 283 struct usb_interface *interface; 284 285 nonseekable_open(inode, file); 286 subminor = iminor(inode); 287 288 down(&disconnect_sem); 289 290 interface = usb_find_interface(&ld_usb_driver, subminor); 291 292 if (!interface) { 293 err("%s - error, can't find device for minor %d\n", 294 __FUNCTION__, subminor); 295 retval = -ENODEV; 296 goto unlock_disconnect_exit; 297 } 298 299 dev = usb_get_intfdata(interface); 300 301 if (!dev) { 302 retval = -ENODEV; 303 goto unlock_disconnect_exit; 304 } 305 306 /* lock this device */ 307 if (down_interruptible(&dev->sem)) { 308 retval = -ERESTARTSYS; 309 goto unlock_disconnect_exit; 310 } 311 312 /* allow opening only once */ 313 if (dev->open_count) { 314 retval = -EBUSY; 315 goto unlock_exit; 316 } 317 dev->open_count = 1; 318 319 /* initialize in direction */ 320 dev->ring_head = 0; 321 dev->ring_tail = 0; 322 usb_fill_int_urb(dev->interrupt_in_urb, 323 interface_to_usbdev(interface), 324 usb_rcvintpipe(interface_to_usbdev(interface), 325 dev->interrupt_in_endpoint->bEndpointAddress), 326 dev->interrupt_in_buffer, 327 dev->interrupt_in_endpoint_size, 328 ld_usb_interrupt_in_callback, 329 dev, 330 dev->interrupt_in_interval); 331 332 dev->interrupt_in_running = 1; 333 dev->interrupt_in_done = 0; 334 335 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 336 if (retval) { 337 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); 338 dev->interrupt_in_running = 0; 339 dev->open_count = 0; 340 goto unlock_exit; 341 } 342 343 /* save device in the file's private structure */ 344 file->private_data = dev; 345 346 unlock_exit: 347 up(&dev->sem); 348 349 unlock_disconnect_exit: 350 up(&disconnect_sem); 351 352 return retval; 353 } 354 355 /** 356 * ld_usb_release 357 */ 358 static int ld_usb_release(struct inode *inode, struct file *file) 359 { 360 struct ld_usb *dev; 361 int retval = 0; 362 363 dev = file->private_data; 364 365 if (dev == NULL) { 366 retval = -ENODEV; 367 goto exit; 368 } 369 370 if (down_interruptible(&dev->sem)) { 371 retval = -ERESTARTSYS; 372 goto exit; 373 } 374 375 if (dev->open_count != 1) { 376 retval = -ENODEV; 377 goto unlock_exit; 378 } 379 if (dev->intf == NULL) { 380 /* the device was unplugged before the file was released */ 381 up(&dev->sem); 382 /* unlock here as ld_usb_delete frees dev */ 383 ld_usb_delete(dev); 384 goto exit; 385 } 386 387 /* wait until write transfer is finished */ 388 if (dev->interrupt_out_busy) 389 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 390 ld_usb_abort_transfers(dev); 391 dev->open_count = 0; 392 393 unlock_exit: 394 up(&dev->sem); 395 396 exit: 397 return retval; 398 } 399 400 /** 401 * ld_usb_poll 402 */ 403 static unsigned int ld_usb_poll(struct file *file, poll_table *wait) 404 { 405 struct ld_usb *dev; 406 unsigned int mask = 0; 407 408 dev = file->private_data; 409 410 poll_wait(file, &dev->read_wait, wait); 411 poll_wait(file, &dev->write_wait, wait); 412 413 if (dev->ring_head != dev->ring_tail) 414 mask |= POLLIN | POLLRDNORM; 415 if (!dev->interrupt_out_busy) 416 mask |= POLLOUT | POLLWRNORM; 417 418 return mask; 419 } 420 421 /** 422 * ld_usb_read 423 */ 424 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, 425 loff_t *ppos) 426 { 427 struct ld_usb *dev; 428 size_t *actual_buffer; 429 size_t bytes_to_read; 430 int retval = 0; 431 432 dev = file->private_data; 433 434 /* verify that we actually have some data to read */ 435 if (count == 0) 436 goto exit; 437 438 /* lock this object */ 439 if (down_interruptible(&dev->sem)) { 440 retval = -ERESTARTSYS; 441 goto exit; 442 } 443 444 /* verify that the device wasn't unplugged */ 445 if (dev->intf == NULL) { 446 retval = -ENODEV; 447 err("No device or device unplugged %d\n", retval); 448 goto unlock_exit; 449 } 450 451 /* wait for data */ 452 if (dev->ring_head == dev->ring_tail) { 453 if (file->f_flags & O_NONBLOCK) { 454 retval = -EAGAIN; 455 goto unlock_exit; 456 } 457 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); 458 if (retval < 0) 459 goto unlock_exit; 460 } 461 462 /* actual_buffer contains actual_length + interrupt_in_buffer */ 463 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 464 bytes_to_read = min(count, *actual_buffer); 465 if (bytes_to_read < *actual_buffer) 466 dev_warn(&dev->intf->dev, "Read buffer overflow, %d bytes dropped\n", 467 *actual_buffer-bytes_to_read); 468 469 /* copy one interrupt_in_buffer from ring_buffer into userspace */ 470 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { 471 retval = -EFAULT; 472 goto unlock_exit; 473 } 474 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; 475 476 retval = bytes_to_read; 477 478 unlock_exit: 479 /* unlock the device */ 480 up(&dev->sem); 481 482 exit: 483 return retval; 484 } 485 486 /** 487 * ld_usb_write 488 */ 489 static ssize_t ld_usb_write(struct file *file, const char __user *buffer, 490 size_t count, loff_t *ppos) 491 { 492 struct ld_usb *dev; 493 size_t bytes_to_write; 494 int retval = 0; 495 496 dev = file->private_data; 497 498 /* verify that we actually have some data to write */ 499 if (count == 0) 500 goto exit; 501 502 /* lock this object */ 503 if (down_interruptible(&dev->sem)) { 504 retval = -ERESTARTSYS; 505 goto exit; 506 } 507 508 /* verify that the device wasn't unplugged */ 509 if (dev->intf == NULL) { 510 retval = -ENODEV; 511 err("No device or device unplugged %d\n", retval); 512 goto unlock_exit; 513 } 514 515 /* wait until previous transfer is finished */ 516 if (dev->interrupt_out_busy) { 517 if (file->f_flags & O_NONBLOCK) { 518 retval = -EAGAIN; 519 goto unlock_exit; 520 } 521 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); 522 if (retval < 0) { 523 goto unlock_exit; 524 } 525 } 526 527 /* write the data into interrupt_out_buffer from userspace */ 528 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); 529 if (bytes_to_write < count) 530 dev_warn(&dev->intf->dev, "Write buffer overflow, %d bytes dropped\n",count-bytes_to_write); 531 dbg_info(&dev->intf->dev, "%s: count = %d, bytes_to_write = %d\n", __FUNCTION__, count, bytes_to_write); 532 533 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 534 retval = -EFAULT; 535 goto unlock_exit; 536 } 537 538 if (dev->interrupt_out_endpoint == NULL) { 539 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ 540 retval = usb_control_msg(interface_to_usbdev(dev->intf), 541 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), 542 9, 543 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 544 1 << 8, 0, 545 dev->interrupt_out_buffer, 546 bytes_to_write, 547 USB_CTRL_SET_TIMEOUT * HZ); 548 if (retval < 0) 549 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval); 550 goto unlock_exit; 551 } 552 553 /* send off the urb */ 554 usb_fill_int_urb(dev->interrupt_out_urb, 555 interface_to_usbdev(dev->intf), 556 usb_sndintpipe(interface_to_usbdev(dev->intf), 557 dev->interrupt_out_endpoint->bEndpointAddress), 558 dev->interrupt_out_buffer, 559 bytes_to_write, 560 ld_usb_interrupt_out_callback, 561 dev, 562 dev->interrupt_out_interval); 563 564 dev->interrupt_out_busy = 1; 565 wmb(); 566 567 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 568 if (retval) { 569 dev->interrupt_out_busy = 0; 570 err("Couldn't submit interrupt_out_urb %d\n", retval); 571 goto unlock_exit; 572 } 573 retval = bytes_to_write; 574 575 unlock_exit: 576 /* unlock the device */ 577 up(&dev->sem); 578 579 exit: 580 return retval; 581 } 582 583 /* file operations needed when we register this driver */ 584 static struct file_operations ld_usb_fops = { 585 .owner = THIS_MODULE, 586 .read = ld_usb_read, 587 .write = ld_usb_write, 588 .open = ld_usb_open, 589 .release = ld_usb_release, 590 .poll = ld_usb_poll, 591 }; 592 593 /* 594 * usb class driver info in order to get a minor number from the usb core, 595 * and to have the device registered with devfs and the driver core 596 */ 597 static struct usb_class_driver ld_usb_class = { 598 .name = "ldusb%d", 599 .fops = &ld_usb_fops, 600 .minor_base = USB_LD_MINOR_BASE, 601 }; 602 603 /** 604 * ld_usb_probe 605 * 606 * Called by the usb core when a new device is connected that it thinks 607 * this driver might be interested in. 608 */ 609 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) 610 { 611 struct usb_device *udev = interface_to_usbdev(intf); 612 struct ld_usb *dev = NULL; 613 struct usb_host_interface *iface_desc; 614 struct usb_endpoint_descriptor *endpoint; 615 char *buffer; 616 int i; 617 int retval = -ENOMEM; 618 619 /* allocate memory for our device state and intialize it */ 620 621 dev = kmalloc(sizeof(*dev), GFP_KERNEL); 622 if (dev == NULL) { 623 dev_err(&intf->dev, "Out of memory\n"); 624 goto exit; 625 } 626 memset(dev, 0x00, sizeof(*dev)); 627 init_MUTEX(&dev->sem); 628 dev->intf = intf; 629 init_waitqueue_head(&dev->read_wait); 630 init_waitqueue_head(&dev->write_wait); 631 632 /* workaround for early firmware versions on fast computers */ 633 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && 634 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_CASSY) || 635 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_COM3LAB)) && 636 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { 637 buffer = kmalloc(256, GFP_KERNEL); 638 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ 639 usb_string(udev, 255, buffer, 256); 640 kfree(buffer); 641 } 642 643 iface_desc = intf->cur_altsetting; 644 645 /* set up the endpoint information */ 646 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 647 endpoint = &iface_desc->endpoint[i].desc; 648 649 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) && 650 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 651 dev->interrupt_in_endpoint = endpoint; 652 } 653 654 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) && 655 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 656 dev->interrupt_out_endpoint = endpoint; 657 } 658 } 659 if (dev->interrupt_in_endpoint == NULL) { 660 dev_err(&intf->dev, "Interrupt in endpoint not found\n"); 661 goto error; 662 } 663 if (dev->interrupt_out_endpoint == NULL) 664 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); 665 666 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); 667 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL); 668 if (!dev->ring_buffer) { 669 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n"); 670 goto error; 671 } 672 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 673 if (!dev->interrupt_in_buffer) { 674 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); 675 goto error; 676 } 677 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 678 if (!dev->interrupt_in_urb) { 679 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); 680 goto error; 681 } 682 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) : 683 udev->descriptor.bMaxPacketSize0; 684 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL); 685 if (!dev->interrupt_out_buffer) { 686 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); 687 goto error; 688 } 689 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 690 if (!dev->interrupt_out_urb) { 691 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); 692 goto error; 693 } 694 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 695 if (dev->interrupt_out_endpoint) 696 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 697 698 /* we can register the device now, as it is ready */ 699 usb_set_intfdata(intf, dev); 700 701 retval = usb_register_dev(intf, &ld_usb_class); 702 if (retval) { 703 /* something prevented us from registering this driver */ 704 dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 705 usb_set_intfdata(intf, NULL); 706 goto error; 707 } 708 709 /* let the user know what node this device is now attached to */ 710 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n", 711 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor); 712 713 exit: 714 return retval; 715 716 error: 717 ld_usb_delete(dev); 718 719 return retval; 720 } 721 722 /** 723 * ld_usb_disconnect 724 * 725 * Called by the usb core when the device is removed from the system. 726 */ 727 static void ld_usb_disconnect(struct usb_interface *intf) 728 { 729 struct ld_usb *dev; 730 int minor; 731 732 down(&disconnect_sem); 733 734 dev = usb_get_intfdata(intf); 735 usb_set_intfdata(intf, NULL); 736 737 down(&dev->sem); 738 739 minor = intf->minor; 740 741 /* give back our minor */ 742 usb_deregister_dev(intf, &ld_usb_class); 743 744 /* if the device is not opened, then we clean up right now */ 745 if (!dev->open_count) { 746 up(&dev->sem); 747 ld_usb_delete(dev); 748 } else { 749 dev->intf = NULL; 750 up(&dev->sem); 751 } 752 753 up(&disconnect_sem); 754 755 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", 756 (minor - USB_LD_MINOR_BASE)); 757 } 758 759 /* usb specific object needed to register this driver with the usb subsystem */ 760 static struct usb_driver ld_usb_driver = { 761 .owner = THIS_MODULE, 762 .name = "ldusb", 763 .probe = ld_usb_probe, 764 .disconnect = ld_usb_disconnect, 765 .id_table = ld_usb_table, 766 }; 767 768 /** 769 * ld_usb_init 770 */ 771 static int __init ld_usb_init(void) 772 { 773 int retval; 774 775 /* register this driver with the USB subsystem */ 776 retval = usb_register(&ld_usb_driver); 777 if (retval) 778 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval); 779 780 return retval; 781 } 782 783 /** 784 * ld_usb_exit 785 */ 786 static void __exit ld_usb_exit(void) 787 { 788 /* deregister this driver with the USB subsystem */ 789 usb_deregister(&ld_usb_driver); 790 } 791 792 module_init(ld_usb_init); 793 module_exit(ld_usb_exit); 794 795