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 * V0.12 (mh) Added kmalloc check for string buffer 27 */ 28 29 #include <linux/config.h> 30 #include <linux/kernel.h> 31 #include <linux/errno.h> 32 #include <linux/init.h> 33 #include <linux/slab.h> 34 #include <linux/module.h> 35 36 #include <asm/uaccess.h> 37 #include <linux/input.h> 38 #include <linux/usb.h> 39 #include <linux/poll.h> 40 41 /* Define these values to match your devices */ 42 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */ 43 #define USB_DEVICE_ID_CASSY 0x1000 /* USB Product ID for all CASSY-S modules */ 44 #define USB_DEVICE_ID_POCKETCASSY 0x1010 /* USB Product ID for Pocket-CASSY */ 45 #define USB_DEVICE_ID_MOBILECASSY 0x1020 /* USB Product ID for Mobile-CASSY */ 46 #define USB_DEVICE_ID_JWM 0x1080 /* USB Product ID for Joule and Wattmeter */ 47 #define USB_DEVICE_ID_DMMP 0x1081 /* USB Product ID for Digital Multimeter P (reserved) */ 48 #define USB_DEVICE_ID_UMIP 0x1090 /* USB Product ID for UMI P */ 49 #define USB_DEVICE_ID_VIDEOCOM 0x1200 /* USB Product ID for VideoCom */ 50 #define USB_DEVICE_ID_COM3LAB 0x2000 /* USB Product ID for COM3LAB */ 51 #define USB_DEVICE_ID_TELEPORT 0x2010 /* USB Product ID for Terminal Adapter */ 52 #define USB_DEVICE_ID_NETWORKANALYSER 0x2020 /* USB Product ID for Network Analyser */ 53 #define USB_DEVICE_ID_POWERCONTROL 0x2030 /* USB Product ID for Controlling device for Power Electronics */ 54 55 #define USB_VENDOR_ID_VERNIER 0x08f7 56 #define USB_DEVICE_ID_VERNIER_LABPRO 0x0001 57 #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002 58 #define USB_DEVICE_ID_VERNIER_SKIP 0x0003 59 #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004 60 61 62 #ifdef CONFIG_USB_DYNAMIC_MINORS 63 #define USB_LD_MINOR_BASE 0 64 #else 65 #define USB_LD_MINOR_BASE 176 66 #endif 67 68 /* table of devices that work with this driver */ 69 static struct usb_device_id ld_usb_table [] = { 70 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_CASSY) }, 71 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_POCKETCASSY) }, 72 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_MOBILECASSY) }, 73 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_JWM) }, 74 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_DMMP) }, 75 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_UMIP) }, 76 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_VIDEOCOM) }, 77 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_COM3LAB) }, 78 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_TELEPORT) }, 79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_NETWORKANALYSER) }, 80 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_POWERCONTROL) }, 81 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) }, 82 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) }, 83 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) }, 84 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) }, 85 { } /* Terminating entry */ 86 }; 87 MODULE_DEVICE_TABLE(usb, ld_usb_table); 88 MODULE_VERSION("V0.12"); 89 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); 90 MODULE_DESCRIPTION("LD USB Driver"); 91 MODULE_LICENSE("GPL"); 92 MODULE_SUPPORTED_DEVICE("LD USB Devices"); 93 94 #ifdef CONFIG_USB_DEBUG 95 static int debug = 1; 96 #else 97 static int debug = 0; 98 #endif 99 100 /* Use our own dbg macro */ 101 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0) 102 103 /* Module parameters */ 104 module_param(debug, int, S_IRUGO | S_IWUSR); 105 MODULE_PARM_DESC(debug, "Debug enabled or not"); 106 107 /* All interrupt in transfers are collected in a ring buffer to 108 * avoid racing conditions and get better performance of the driver. 109 */ 110 static int ring_buffer_size = 128; 111 module_param(ring_buffer_size, int, 0); 112 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); 113 114 /* The write_buffer can contain more than one interrupt out transfer. 115 */ 116 static int write_buffer_size = 10; 117 module_param(write_buffer_size, int, 0); 118 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); 119 120 /* As of kernel version 2.6.4 ehci-hcd uses an 121 * "only one interrupt transfer per frame" shortcut 122 * to simplify the scheduling of periodic transfers. 123 * This conflicts with our standard 1ms intervals for in and out URBs. 124 * We use default intervals of 2ms for in and 2ms for out transfers, 125 * which should be fast enough. 126 * Increase the interval to allow more devices that do interrupt transfers, 127 * or set to 1 to use the standard interval from the endpoint descriptors. 128 */ 129 static int min_interrupt_in_interval = 2; 130 module_param(min_interrupt_in_interval, int, 0); 131 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); 132 133 static int min_interrupt_out_interval = 2; 134 module_param(min_interrupt_out_interval, int, 0); 135 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); 136 137 /* Structure to hold all of our device specific stuff */ 138 struct ld_usb { 139 struct semaphore sem; /* locks this structure */ 140 struct usb_interface* intf; /* save off the usb interface pointer */ 141 142 int open_count; /* number of times this port has been opened */ 143 144 char* ring_buffer; 145 unsigned int ring_head; 146 unsigned int ring_tail; 147 148 wait_queue_head_t read_wait; 149 wait_queue_head_t write_wait; 150 151 char* interrupt_in_buffer; 152 struct usb_endpoint_descriptor* interrupt_in_endpoint; 153 struct urb* interrupt_in_urb; 154 int interrupt_in_interval; 155 size_t interrupt_in_endpoint_size; 156 int interrupt_in_running; 157 int interrupt_in_done; 158 159 char* interrupt_out_buffer; 160 struct usb_endpoint_descriptor* interrupt_out_endpoint; 161 struct urb* interrupt_out_urb; 162 int interrupt_out_interval; 163 size_t interrupt_out_endpoint_size; 164 int interrupt_out_busy; 165 }; 166 167 /* prevent races between open() and disconnect() */ 168 static DECLARE_MUTEX(disconnect_sem); 169 170 static struct usb_driver ld_usb_driver; 171 172 /** 173 * ld_usb_abort_transfers 174 * aborts transfers and frees associated data structures 175 */ 176 static void ld_usb_abort_transfers(struct ld_usb *dev) 177 { 178 /* shutdown transfer */ 179 if (dev->interrupt_in_running) { 180 dev->interrupt_in_running = 0; 181 if (dev->intf) 182 usb_kill_urb(dev->interrupt_in_urb); 183 } 184 if (dev->interrupt_out_busy) 185 if (dev->intf) 186 usb_kill_urb(dev->interrupt_out_urb); 187 } 188 189 /** 190 * ld_usb_delete 191 */ 192 static void ld_usb_delete(struct ld_usb *dev) 193 { 194 ld_usb_abort_transfers(dev); 195 196 /* free data structures */ 197 usb_free_urb(dev->interrupt_in_urb); 198 usb_free_urb(dev->interrupt_out_urb); 199 kfree(dev->ring_buffer); 200 kfree(dev->interrupt_in_buffer); 201 kfree(dev->interrupt_out_buffer); 202 kfree(dev); 203 } 204 205 /** 206 * ld_usb_interrupt_in_callback 207 */ 208 static void ld_usb_interrupt_in_callback(struct urb *urb, struct pt_regs *regs) 209 { 210 struct ld_usb *dev = urb->context; 211 size_t *actual_buffer; 212 unsigned int next_ring_head; 213 int retval; 214 215 if (urb->status) { 216 if (urb->status == -ENOENT || 217 urb->status == -ECONNRESET || 218 urb->status == -ESHUTDOWN) { 219 goto exit; 220 } else { 221 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n", 222 __FUNCTION__, urb->status); 223 goto resubmit; /* maybe we can recover */ 224 } 225 } 226 227 if (urb->actual_length > 0) { 228 next_ring_head = (dev->ring_head+1) % ring_buffer_size; 229 if (next_ring_head != dev->ring_tail) { 230 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 231 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ 232 *actual_buffer = urb->actual_length; 233 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); 234 dev->ring_head = next_ring_head; 235 dbg_info(&dev->intf->dev, "%s: received %d bytes\n", 236 __FUNCTION__, urb->actual_length); 237 } else 238 dev_warn(&dev->intf->dev, 239 "Ring buffer overflow, %d bytes dropped\n", 240 urb->actual_length); 241 } 242 243 resubmit: 244 /* resubmit if we're still running */ 245 if (dev->interrupt_in_running && dev->intf) { 246 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 247 if (retval) 248 dev_err(&dev->intf->dev, 249 "usb_submit_urb failed (%d)\n", retval); 250 } 251 252 exit: 253 dev->interrupt_in_done = 1; 254 wake_up_interruptible(&dev->read_wait); 255 } 256 257 /** 258 * ld_usb_interrupt_out_callback 259 */ 260 static void ld_usb_interrupt_out_callback(struct urb *urb, struct pt_regs *regs) 261 { 262 struct ld_usb *dev = urb->context; 263 264 /* sync/async unlink faults aren't errors */ 265 if (urb->status && !(urb->status == -ENOENT || 266 urb->status == -ECONNRESET || 267 urb->status == -ESHUTDOWN)) 268 dbg_info(&dev->intf->dev, 269 "%s - nonzero write interrupt status received: %d\n", 270 __FUNCTION__, urb->status); 271 272 dev->interrupt_out_busy = 0; 273 wake_up_interruptible(&dev->write_wait); 274 } 275 276 /** 277 * ld_usb_open 278 */ 279 static int ld_usb_open(struct inode *inode, struct file *file) 280 { 281 struct ld_usb *dev; 282 int subminor; 283 int retval = 0; 284 struct usb_interface *interface; 285 286 nonseekable_open(inode, file); 287 subminor = iminor(inode); 288 289 down(&disconnect_sem); 290 291 interface = usb_find_interface(&ld_usb_driver, subminor); 292 293 if (!interface) { 294 err("%s - error, can't find device for minor %d\n", 295 __FUNCTION__, subminor); 296 retval = -ENODEV; 297 goto unlock_disconnect_exit; 298 } 299 300 dev = usb_get_intfdata(interface); 301 302 if (!dev) { 303 retval = -ENODEV; 304 goto unlock_disconnect_exit; 305 } 306 307 /* lock this device */ 308 if (down_interruptible(&dev->sem)) { 309 retval = -ERESTARTSYS; 310 goto unlock_disconnect_exit; 311 } 312 313 /* allow opening only once */ 314 if (dev->open_count) { 315 retval = -EBUSY; 316 goto unlock_exit; 317 } 318 dev->open_count = 1; 319 320 /* initialize in direction */ 321 dev->ring_head = 0; 322 dev->ring_tail = 0; 323 usb_fill_int_urb(dev->interrupt_in_urb, 324 interface_to_usbdev(interface), 325 usb_rcvintpipe(interface_to_usbdev(interface), 326 dev->interrupt_in_endpoint->bEndpointAddress), 327 dev->interrupt_in_buffer, 328 dev->interrupt_in_endpoint_size, 329 ld_usb_interrupt_in_callback, 330 dev, 331 dev->interrupt_in_interval); 332 333 dev->interrupt_in_running = 1; 334 dev->interrupt_in_done = 0; 335 336 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 337 if (retval) { 338 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); 339 dev->interrupt_in_running = 0; 340 dev->open_count = 0; 341 goto unlock_exit; 342 } 343 344 /* save device in the file's private structure */ 345 file->private_data = dev; 346 347 unlock_exit: 348 up(&dev->sem); 349 350 unlock_disconnect_exit: 351 up(&disconnect_sem); 352 353 return retval; 354 } 355 356 /** 357 * ld_usb_release 358 */ 359 static int ld_usb_release(struct inode *inode, struct file *file) 360 { 361 struct ld_usb *dev; 362 int retval = 0; 363 364 dev = file->private_data; 365 366 if (dev == NULL) { 367 retval = -ENODEV; 368 goto exit; 369 } 370 371 if (down_interruptible(&dev->sem)) { 372 retval = -ERESTARTSYS; 373 goto exit; 374 } 375 376 if (dev->open_count != 1) { 377 retval = -ENODEV; 378 goto unlock_exit; 379 } 380 if (dev->intf == NULL) { 381 /* the device was unplugged before the file was released */ 382 up(&dev->sem); 383 /* unlock here as ld_usb_delete frees dev */ 384 ld_usb_delete(dev); 385 goto exit; 386 } 387 388 /* wait until write transfer is finished */ 389 if (dev->interrupt_out_busy) 390 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 391 ld_usb_abort_transfers(dev); 392 dev->open_count = 0; 393 394 unlock_exit: 395 up(&dev->sem); 396 397 exit: 398 return retval; 399 } 400 401 /** 402 * ld_usb_poll 403 */ 404 static unsigned int ld_usb_poll(struct file *file, poll_table *wait) 405 { 406 struct ld_usb *dev; 407 unsigned int mask = 0; 408 409 dev = file->private_data; 410 411 poll_wait(file, &dev->read_wait, wait); 412 poll_wait(file, &dev->write_wait, wait); 413 414 if (dev->ring_head != dev->ring_tail) 415 mask |= POLLIN | POLLRDNORM; 416 if (!dev->interrupt_out_busy) 417 mask |= POLLOUT | POLLWRNORM; 418 419 return mask; 420 } 421 422 /** 423 * ld_usb_read 424 */ 425 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, 426 loff_t *ppos) 427 { 428 struct ld_usb *dev; 429 size_t *actual_buffer; 430 size_t bytes_to_read; 431 int retval = 0; 432 433 dev = file->private_data; 434 435 /* verify that we actually have some data to read */ 436 if (count == 0) 437 goto exit; 438 439 /* lock this object */ 440 if (down_interruptible(&dev->sem)) { 441 retval = -ERESTARTSYS; 442 goto exit; 443 } 444 445 /* verify that the device wasn't unplugged */ 446 if (dev->intf == NULL) { 447 retval = -ENODEV; 448 err("No device or device unplugged %d\n", retval); 449 goto unlock_exit; 450 } 451 452 /* wait for data */ 453 if (dev->ring_head == dev->ring_tail) { 454 if (file->f_flags & O_NONBLOCK) { 455 retval = -EAGAIN; 456 goto unlock_exit; 457 } 458 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); 459 if (retval < 0) 460 goto unlock_exit; 461 } 462 463 /* actual_buffer contains actual_length + interrupt_in_buffer */ 464 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 465 bytes_to_read = min(count, *actual_buffer); 466 if (bytes_to_read < *actual_buffer) 467 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n", 468 *actual_buffer-bytes_to_read); 469 470 /* copy one interrupt_in_buffer from ring_buffer into userspace */ 471 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { 472 retval = -EFAULT; 473 goto unlock_exit; 474 } 475 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; 476 477 retval = bytes_to_read; 478 479 unlock_exit: 480 /* unlock the device */ 481 up(&dev->sem); 482 483 exit: 484 return retval; 485 } 486 487 /** 488 * ld_usb_write 489 */ 490 static ssize_t ld_usb_write(struct file *file, const char __user *buffer, 491 size_t count, loff_t *ppos) 492 { 493 struct ld_usb *dev; 494 size_t bytes_to_write; 495 int retval = 0; 496 497 dev = file->private_data; 498 499 /* verify that we actually have some data to write */ 500 if (count == 0) 501 goto exit; 502 503 /* lock this object */ 504 if (down_interruptible(&dev->sem)) { 505 retval = -ERESTARTSYS; 506 goto exit; 507 } 508 509 /* verify that the device wasn't unplugged */ 510 if (dev->intf == NULL) { 511 retval = -ENODEV; 512 err("No device or device unplugged %d\n", retval); 513 goto unlock_exit; 514 } 515 516 /* wait until previous transfer is finished */ 517 if (dev->interrupt_out_busy) { 518 if (file->f_flags & O_NONBLOCK) { 519 retval = -EAGAIN; 520 goto unlock_exit; 521 } 522 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); 523 if (retval < 0) { 524 goto unlock_exit; 525 } 526 } 527 528 /* write the data into interrupt_out_buffer from userspace */ 529 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); 530 if (bytes_to_write < count) 531 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write); 532 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write); 533 534 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 535 retval = -EFAULT; 536 goto unlock_exit; 537 } 538 539 if (dev->interrupt_out_endpoint == NULL) { 540 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ 541 retval = usb_control_msg(interface_to_usbdev(dev->intf), 542 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), 543 9, 544 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 545 1 << 8, 0, 546 dev->interrupt_out_buffer, 547 bytes_to_write, 548 USB_CTRL_SET_TIMEOUT * HZ); 549 if (retval < 0) 550 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval); 551 goto unlock_exit; 552 } 553 554 /* send off the urb */ 555 usb_fill_int_urb(dev->interrupt_out_urb, 556 interface_to_usbdev(dev->intf), 557 usb_sndintpipe(interface_to_usbdev(dev->intf), 558 dev->interrupt_out_endpoint->bEndpointAddress), 559 dev->interrupt_out_buffer, 560 bytes_to_write, 561 ld_usb_interrupt_out_callback, 562 dev, 563 dev->interrupt_out_interval); 564 565 dev->interrupt_out_busy = 1; 566 wmb(); 567 568 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 569 if (retval) { 570 dev->interrupt_out_busy = 0; 571 err("Couldn't submit interrupt_out_urb %d\n", retval); 572 goto unlock_exit; 573 } 574 retval = bytes_to_write; 575 576 unlock_exit: 577 /* unlock the device */ 578 up(&dev->sem); 579 580 exit: 581 return retval; 582 } 583 584 /* file operations needed when we register this driver */ 585 static struct file_operations ld_usb_fops = { 586 .owner = THIS_MODULE, 587 .read = ld_usb_read, 588 .write = ld_usb_write, 589 .open = ld_usb_open, 590 .release = ld_usb_release, 591 .poll = ld_usb_poll, 592 }; 593 594 /* 595 * usb class driver info in order to get a minor number from the usb core, 596 * and to have the device registered with devfs and the driver core 597 */ 598 static struct usb_class_driver ld_usb_class = { 599 .name = "ldusb%d", 600 .fops = &ld_usb_fops, 601 .minor_base = USB_LD_MINOR_BASE, 602 }; 603 604 /** 605 * ld_usb_probe 606 * 607 * Called by the usb core when a new device is connected that it thinks 608 * this driver might be interested in. 609 */ 610 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) 611 { 612 struct usb_device *udev = interface_to_usbdev(intf); 613 struct ld_usb *dev = NULL; 614 struct usb_host_interface *iface_desc; 615 struct usb_endpoint_descriptor *endpoint; 616 char *buffer; 617 int i; 618 int retval = -ENOMEM; 619 620 /* allocate memory for our device state and intialize it */ 621 622 dev = kmalloc(sizeof(*dev), GFP_KERNEL); 623 if (dev == NULL) { 624 dev_err(&intf->dev, "Out of memory\n"); 625 goto exit; 626 } 627 memset(dev, 0x00, sizeof(*dev)); 628 init_MUTEX(&dev->sem); 629 dev->intf = intf; 630 init_waitqueue_head(&dev->read_wait); 631 init_waitqueue_head(&dev->write_wait); 632 633 /* workaround for early firmware versions on fast computers */ 634 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && 635 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_CASSY) || 636 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_COM3LAB)) && 637 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { 638 buffer = kmalloc(256, GFP_KERNEL); 639 if (buffer == NULL) { 640 dev_err(&intf->dev, "Couldn't allocate string buffer\n"); 641 goto error; 642 } 643 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ 644 usb_string(udev, 255, buffer, 256); 645 kfree(buffer); 646 } 647 648 iface_desc = intf->cur_altsetting; 649 650 /* set up the endpoint information */ 651 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 652 endpoint = &iface_desc->endpoint[i].desc; 653 654 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) && 655 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 656 dev->interrupt_in_endpoint = endpoint; 657 } 658 659 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) && 660 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 661 dev->interrupt_out_endpoint = endpoint; 662 } 663 } 664 if (dev->interrupt_in_endpoint == NULL) { 665 dev_err(&intf->dev, "Interrupt in endpoint not found\n"); 666 goto error; 667 } 668 if (dev->interrupt_out_endpoint == NULL) 669 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); 670 671 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); 672 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL); 673 if (!dev->ring_buffer) { 674 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n"); 675 goto error; 676 } 677 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 678 if (!dev->interrupt_in_buffer) { 679 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); 680 goto error; 681 } 682 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 683 if (!dev->interrupt_in_urb) { 684 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); 685 goto error; 686 } 687 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) : 688 udev->descriptor.bMaxPacketSize0; 689 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL); 690 if (!dev->interrupt_out_buffer) { 691 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); 692 goto error; 693 } 694 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 695 if (!dev->interrupt_out_urb) { 696 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); 697 goto error; 698 } 699 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 700 if (dev->interrupt_out_endpoint) 701 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 702 703 /* we can register the device now, as it is ready */ 704 usb_set_intfdata(intf, dev); 705 706 retval = usb_register_dev(intf, &ld_usb_class); 707 if (retval) { 708 /* something prevented us from registering this driver */ 709 dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 710 usb_set_intfdata(intf, NULL); 711 goto error; 712 } 713 714 /* let the user know what node this device is now attached to */ 715 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n", 716 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor); 717 718 exit: 719 return retval; 720 721 error: 722 ld_usb_delete(dev); 723 724 return retval; 725 } 726 727 /** 728 * ld_usb_disconnect 729 * 730 * Called by the usb core when the device is removed from the system. 731 */ 732 static void ld_usb_disconnect(struct usb_interface *intf) 733 { 734 struct ld_usb *dev; 735 int minor; 736 737 down(&disconnect_sem); 738 739 dev = usb_get_intfdata(intf); 740 usb_set_intfdata(intf, NULL); 741 742 down(&dev->sem); 743 744 minor = intf->minor; 745 746 /* give back our minor */ 747 usb_deregister_dev(intf, &ld_usb_class); 748 749 /* if the device is not opened, then we clean up right now */ 750 if (!dev->open_count) { 751 up(&dev->sem); 752 ld_usb_delete(dev); 753 } else { 754 dev->intf = NULL; 755 up(&dev->sem); 756 } 757 758 up(&disconnect_sem); 759 760 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", 761 (minor - USB_LD_MINOR_BASE)); 762 } 763 764 /* usb specific object needed to register this driver with the usb subsystem */ 765 static struct usb_driver ld_usb_driver = { 766 .name = "ldusb", 767 .probe = ld_usb_probe, 768 .disconnect = ld_usb_disconnect, 769 .id_table = ld_usb_table, 770 }; 771 772 /** 773 * ld_usb_init 774 */ 775 static int __init ld_usb_init(void) 776 { 777 int retval; 778 779 /* register this driver with the USB subsystem */ 780 retval = usb_register(&ld_usb_driver); 781 if (retval) 782 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval); 783 784 return retval; 785 } 786 787 /** 788 * ld_usb_exit 789 */ 790 static void __exit ld_usb_exit(void) 791 { 792 /* deregister this driver with the USB subsystem */ 793 usb_deregister(&ld_usb_driver); 794 } 795 796 module_init(ld_usb_init); 797 module_exit(ld_usb_exit); 798 799