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 * V0.13 (mh) Added support for LD X-Ray and Machine Test System 28 */ 29 30 #include <linux/config.h> 31 #include <linux/kernel.h> 32 #include <linux/errno.h> 33 #include <linux/init.h> 34 #include <linux/slab.h> 35 #include <linux/module.h> 36 #include <linux/mutex.h> 37 38 #include <asm/uaccess.h> 39 #include <linux/input.h> 40 #include <linux/usb.h> 41 #include <linux/poll.h> 42 43 /* Define these values to match your devices */ 44 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */ 45 #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S */ 46 #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */ 47 #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */ 48 #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */ 49 #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */ 50 #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */ 51 #define USB_DEVICE_ID_LD_XRAY1 0x1100 /* USB Product ID of X-Ray Apparatus */ 52 #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus */ 53 #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */ 54 #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */ 55 #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */ 56 #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */ 57 #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */ 58 #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */ 59 60 #define USB_VENDOR_ID_VERNIER 0x08f7 61 #define USB_DEVICE_ID_VERNIER_LABPRO 0x0001 62 #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002 63 #define USB_DEVICE_ID_VERNIER_SKIP 0x0003 64 #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004 65 66 67 #ifdef CONFIG_USB_DYNAMIC_MINORS 68 #define USB_LD_MINOR_BASE 0 69 #else 70 #define USB_LD_MINOR_BASE 176 71 #endif 72 73 /* table of devices that work with this driver */ 74 static struct usb_device_id ld_usb_table [] = { 75 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) }, 76 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) }, 77 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) }, 78 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) }, 79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) }, 80 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) }, 81 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY1) }, 82 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) }, 83 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) }, 84 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) }, 85 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) }, 86 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) }, 87 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) }, 88 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) }, 89 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) }, 90 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) }, 91 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) }, 92 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) }, 93 { } /* Terminating entry */ 94 }; 95 MODULE_DEVICE_TABLE(usb, ld_usb_table); 96 MODULE_VERSION("V0.13"); 97 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); 98 MODULE_DESCRIPTION("LD USB Driver"); 99 MODULE_LICENSE("GPL"); 100 MODULE_SUPPORTED_DEVICE("LD USB Devices"); 101 102 #ifdef CONFIG_USB_DEBUG 103 static int debug = 1; 104 #else 105 static int debug = 0; 106 #endif 107 108 /* Use our own dbg macro */ 109 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0) 110 111 /* Module parameters */ 112 module_param(debug, int, S_IRUGO | S_IWUSR); 113 MODULE_PARM_DESC(debug, "Debug enabled or not"); 114 115 /* All interrupt in transfers are collected in a ring buffer to 116 * avoid racing conditions and get better performance of the driver. 117 */ 118 static int ring_buffer_size = 128; 119 module_param(ring_buffer_size, int, 0); 120 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); 121 122 /* The write_buffer can contain more than one interrupt out transfer. 123 */ 124 static int write_buffer_size = 10; 125 module_param(write_buffer_size, int, 0); 126 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); 127 128 /* As of kernel version 2.6.4 ehci-hcd uses an 129 * "only one interrupt transfer per frame" shortcut 130 * to simplify the scheduling of periodic transfers. 131 * This conflicts with our standard 1ms intervals for in and out URBs. 132 * We use default intervals of 2ms for in and 2ms for out transfers, 133 * which should be fast enough. 134 * Increase the interval to allow more devices that do interrupt transfers, 135 * or set to 1 to use the standard interval from the endpoint descriptors. 136 */ 137 static int min_interrupt_in_interval = 2; 138 module_param(min_interrupt_in_interval, int, 0); 139 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); 140 141 static int min_interrupt_out_interval = 2; 142 module_param(min_interrupt_out_interval, int, 0); 143 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); 144 145 /* Structure to hold all of our device specific stuff */ 146 struct ld_usb { 147 struct semaphore sem; /* locks this structure */ 148 struct usb_interface* intf; /* save off the usb interface pointer */ 149 150 int open_count; /* number of times this port has been opened */ 151 152 char* ring_buffer; 153 unsigned int ring_head; 154 unsigned int ring_tail; 155 156 wait_queue_head_t read_wait; 157 wait_queue_head_t write_wait; 158 159 char* interrupt_in_buffer; 160 struct usb_endpoint_descriptor* interrupt_in_endpoint; 161 struct urb* interrupt_in_urb; 162 int interrupt_in_interval; 163 size_t interrupt_in_endpoint_size; 164 int interrupt_in_running; 165 int interrupt_in_done; 166 167 char* interrupt_out_buffer; 168 struct usb_endpoint_descriptor* interrupt_out_endpoint; 169 struct urb* interrupt_out_urb; 170 int interrupt_out_interval; 171 size_t interrupt_out_endpoint_size; 172 int interrupt_out_busy; 173 }; 174 175 /* prevent races between open() and disconnect() */ 176 static DEFINE_MUTEX(disconnect_mutex); 177 178 static struct usb_driver ld_usb_driver; 179 180 /** 181 * ld_usb_abort_transfers 182 * aborts transfers and frees associated data structures 183 */ 184 static void ld_usb_abort_transfers(struct ld_usb *dev) 185 { 186 /* shutdown transfer */ 187 if (dev->interrupt_in_running) { 188 dev->interrupt_in_running = 0; 189 if (dev->intf) 190 usb_kill_urb(dev->interrupt_in_urb); 191 } 192 if (dev->interrupt_out_busy) 193 if (dev->intf) 194 usb_kill_urb(dev->interrupt_out_urb); 195 } 196 197 /** 198 * ld_usb_delete 199 */ 200 static void ld_usb_delete(struct ld_usb *dev) 201 { 202 ld_usb_abort_transfers(dev); 203 204 /* free data structures */ 205 usb_free_urb(dev->interrupt_in_urb); 206 usb_free_urb(dev->interrupt_out_urb); 207 kfree(dev->ring_buffer); 208 kfree(dev->interrupt_in_buffer); 209 kfree(dev->interrupt_out_buffer); 210 kfree(dev); 211 } 212 213 /** 214 * ld_usb_interrupt_in_callback 215 */ 216 static void ld_usb_interrupt_in_callback(struct urb *urb, struct pt_regs *regs) 217 { 218 struct ld_usb *dev = urb->context; 219 size_t *actual_buffer; 220 unsigned int next_ring_head; 221 int retval; 222 223 if (urb->status) { 224 if (urb->status == -ENOENT || 225 urb->status == -ECONNRESET || 226 urb->status == -ESHUTDOWN) { 227 goto exit; 228 } else { 229 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n", 230 __FUNCTION__, urb->status); 231 goto resubmit; /* maybe we can recover */ 232 } 233 } 234 235 if (urb->actual_length > 0) { 236 next_ring_head = (dev->ring_head+1) % ring_buffer_size; 237 if (next_ring_head != dev->ring_tail) { 238 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 239 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ 240 *actual_buffer = urb->actual_length; 241 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); 242 dev->ring_head = next_ring_head; 243 dbg_info(&dev->intf->dev, "%s: received %d bytes\n", 244 __FUNCTION__, urb->actual_length); 245 } else 246 dev_warn(&dev->intf->dev, 247 "Ring buffer overflow, %d bytes dropped\n", 248 urb->actual_length); 249 } 250 251 resubmit: 252 /* resubmit if we're still running */ 253 if (dev->interrupt_in_running && dev->intf) { 254 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 255 if (retval) 256 dev_err(&dev->intf->dev, 257 "usb_submit_urb failed (%d)\n", retval); 258 } 259 260 exit: 261 dev->interrupt_in_done = 1; 262 wake_up_interruptible(&dev->read_wait); 263 } 264 265 /** 266 * ld_usb_interrupt_out_callback 267 */ 268 static void ld_usb_interrupt_out_callback(struct urb *urb, struct pt_regs *regs) 269 { 270 struct ld_usb *dev = urb->context; 271 272 /* sync/async unlink faults aren't errors */ 273 if (urb->status && !(urb->status == -ENOENT || 274 urb->status == -ECONNRESET || 275 urb->status == -ESHUTDOWN)) 276 dbg_info(&dev->intf->dev, 277 "%s - nonzero write interrupt status received: %d\n", 278 __FUNCTION__, urb->status); 279 280 dev->interrupt_out_busy = 0; 281 wake_up_interruptible(&dev->write_wait); 282 } 283 284 /** 285 * ld_usb_open 286 */ 287 static int ld_usb_open(struct inode *inode, struct file *file) 288 { 289 struct ld_usb *dev; 290 int subminor; 291 int retval = 0; 292 struct usb_interface *interface; 293 294 nonseekable_open(inode, file); 295 subminor = iminor(inode); 296 297 mutex_lock(&disconnect_mutex); 298 299 interface = usb_find_interface(&ld_usb_driver, subminor); 300 301 if (!interface) { 302 err("%s - error, can't find device for minor %d\n", 303 __FUNCTION__, subminor); 304 retval = -ENODEV; 305 goto unlock_disconnect_exit; 306 } 307 308 dev = usb_get_intfdata(interface); 309 310 if (!dev) { 311 retval = -ENODEV; 312 goto unlock_disconnect_exit; 313 } 314 315 /* lock this device */ 316 if (down_interruptible(&dev->sem)) { 317 retval = -ERESTARTSYS; 318 goto unlock_disconnect_exit; 319 } 320 321 /* allow opening only once */ 322 if (dev->open_count) { 323 retval = -EBUSY; 324 goto unlock_exit; 325 } 326 dev->open_count = 1; 327 328 /* initialize in direction */ 329 dev->ring_head = 0; 330 dev->ring_tail = 0; 331 usb_fill_int_urb(dev->interrupt_in_urb, 332 interface_to_usbdev(interface), 333 usb_rcvintpipe(interface_to_usbdev(interface), 334 dev->interrupt_in_endpoint->bEndpointAddress), 335 dev->interrupt_in_buffer, 336 dev->interrupt_in_endpoint_size, 337 ld_usb_interrupt_in_callback, 338 dev, 339 dev->interrupt_in_interval); 340 341 dev->interrupt_in_running = 1; 342 dev->interrupt_in_done = 0; 343 344 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 345 if (retval) { 346 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); 347 dev->interrupt_in_running = 0; 348 dev->open_count = 0; 349 goto unlock_exit; 350 } 351 352 /* save device in the file's private structure */ 353 file->private_data = dev; 354 355 unlock_exit: 356 up(&dev->sem); 357 358 unlock_disconnect_exit: 359 mutex_unlock(&disconnect_mutex); 360 361 return retval; 362 } 363 364 /** 365 * ld_usb_release 366 */ 367 static int ld_usb_release(struct inode *inode, struct file *file) 368 { 369 struct ld_usb *dev; 370 int retval = 0; 371 372 dev = file->private_data; 373 374 if (dev == NULL) { 375 retval = -ENODEV; 376 goto exit; 377 } 378 379 if (down_interruptible(&dev->sem)) { 380 retval = -ERESTARTSYS; 381 goto exit; 382 } 383 384 if (dev->open_count != 1) { 385 retval = -ENODEV; 386 goto unlock_exit; 387 } 388 if (dev->intf == NULL) { 389 /* the device was unplugged before the file was released */ 390 up(&dev->sem); 391 /* unlock here as ld_usb_delete frees dev */ 392 ld_usb_delete(dev); 393 goto exit; 394 } 395 396 /* wait until write transfer is finished */ 397 if (dev->interrupt_out_busy) 398 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 399 ld_usb_abort_transfers(dev); 400 dev->open_count = 0; 401 402 unlock_exit: 403 up(&dev->sem); 404 405 exit: 406 return retval; 407 } 408 409 /** 410 * ld_usb_poll 411 */ 412 static unsigned int ld_usb_poll(struct file *file, poll_table *wait) 413 { 414 struct ld_usb *dev; 415 unsigned int mask = 0; 416 417 dev = file->private_data; 418 419 poll_wait(file, &dev->read_wait, wait); 420 poll_wait(file, &dev->write_wait, wait); 421 422 if (dev->ring_head != dev->ring_tail) 423 mask |= POLLIN | POLLRDNORM; 424 if (!dev->interrupt_out_busy) 425 mask |= POLLOUT | POLLWRNORM; 426 427 return mask; 428 } 429 430 /** 431 * ld_usb_read 432 */ 433 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, 434 loff_t *ppos) 435 { 436 struct ld_usb *dev; 437 size_t *actual_buffer; 438 size_t bytes_to_read; 439 int retval = 0; 440 441 dev = file->private_data; 442 443 /* verify that we actually have some data to read */ 444 if (count == 0) 445 goto exit; 446 447 /* lock this object */ 448 if (down_interruptible(&dev->sem)) { 449 retval = -ERESTARTSYS; 450 goto exit; 451 } 452 453 /* verify that the device wasn't unplugged */ 454 if (dev->intf == NULL) { 455 retval = -ENODEV; 456 err("No device or device unplugged %d\n", retval); 457 goto unlock_exit; 458 } 459 460 /* wait for data */ 461 if (dev->ring_head == dev->ring_tail) { 462 if (file->f_flags & O_NONBLOCK) { 463 retval = -EAGAIN; 464 goto unlock_exit; 465 } 466 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); 467 if (retval < 0) 468 goto unlock_exit; 469 } 470 471 /* actual_buffer contains actual_length + interrupt_in_buffer */ 472 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 473 bytes_to_read = min(count, *actual_buffer); 474 if (bytes_to_read < *actual_buffer) 475 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n", 476 *actual_buffer-bytes_to_read); 477 478 /* copy one interrupt_in_buffer from ring_buffer into userspace */ 479 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { 480 retval = -EFAULT; 481 goto unlock_exit; 482 } 483 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; 484 485 retval = bytes_to_read; 486 487 unlock_exit: 488 /* unlock the device */ 489 up(&dev->sem); 490 491 exit: 492 return retval; 493 } 494 495 /** 496 * ld_usb_write 497 */ 498 static ssize_t ld_usb_write(struct file *file, const char __user *buffer, 499 size_t count, loff_t *ppos) 500 { 501 struct ld_usb *dev; 502 size_t bytes_to_write; 503 int retval = 0; 504 505 dev = file->private_data; 506 507 /* verify that we actually have some data to write */ 508 if (count == 0) 509 goto exit; 510 511 /* lock this object */ 512 if (down_interruptible(&dev->sem)) { 513 retval = -ERESTARTSYS; 514 goto exit; 515 } 516 517 /* verify that the device wasn't unplugged */ 518 if (dev->intf == NULL) { 519 retval = -ENODEV; 520 err("No device or device unplugged %d\n", retval); 521 goto unlock_exit; 522 } 523 524 /* wait until previous transfer is finished */ 525 if (dev->interrupt_out_busy) { 526 if (file->f_flags & O_NONBLOCK) { 527 retval = -EAGAIN; 528 goto unlock_exit; 529 } 530 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); 531 if (retval < 0) { 532 goto unlock_exit; 533 } 534 } 535 536 /* write the data into interrupt_out_buffer from userspace */ 537 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); 538 if (bytes_to_write < count) 539 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write); 540 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write); 541 542 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 543 retval = -EFAULT; 544 goto unlock_exit; 545 } 546 547 if (dev->interrupt_out_endpoint == NULL) { 548 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ 549 retval = usb_control_msg(interface_to_usbdev(dev->intf), 550 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), 551 9, 552 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 553 1 << 8, 0, 554 dev->interrupt_out_buffer, 555 bytes_to_write, 556 USB_CTRL_SET_TIMEOUT * HZ); 557 if (retval < 0) 558 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval); 559 goto unlock_exit; 560 } 561 562 /* send off the urb */ 563 usb_fill_int_urb(dev->interrupt_out_urb, 564 interface_to_usbdev(dev->intf), 565 usb_sndintpipe(interface_to_usbdev(dev->intf), 566 dev->interrupt_out_endpoint->bEndpointAddress), 567 dev->interrupt_out_buffer, 568 bytes_to_write, 569 ld_usb_interrupt_out_callback, 570 dev, 571 dev->interrupt_out_interval); 572 573 dev->interrupt_out_busy = 1; 574 wmb(); 575 576 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 577 if (retval) { 578 dev->interrupt_out_busy = 0; 579 err("Couldn't submit interrupt_out_urb %d\n", retval); 580 goto unlock_exit; 581 } 582 retval = bytes_to_write; 583 584 unlock_exit: 585 /* unlock the device */ 586 up(&dev->sem); 587 588 exit: 589 return retval; 590 } 591 592 /* file operations needed when we register this driver */ 593 static struct file_operations ld_usb_fops = { 594 .owner = THIS_MODULE, 595 .read = ld_usb_read, 596 .write = ld_usb_write, 597 .open = ld_usb_open, 598 .release = ld_usb_release, 599 .poll = ld_usb_poll, 600 }; 601 602 /* 603 * usb class driver info in order to get a minor number from the usb core, 604 * and to have the device registered with the driver core 605 */ 606 static struct usb_class_driver ld_usb_class = { 607 .name = "ldusb%d", 608 .fops = &ld_usb_fops, 609 .minor_base = USB_LD_MINOR_BASE, 610 }; 611 612 /** 613 * ld_usb_probe 614 * 615 * Called by the usb core when a new device is connected that it thinks 616 * this driver might be interested in. 617 */ 618 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) 619 { 620 struct usb_device *udev = interface_to_usbdev(intf); 621 struct ld_usb *dev = NULL; 622 struct usb_host_interface *iface_desc; 623 struct usb_endpoint_descriptor *endpoint; 624 char *buffer; 625 int i; 626 int retval = -ENOMEM; 627 628 /* allocate memory for our device state and intialize it */ 629 630 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 631 if (dev == NULL) { 632 dev_err(&intf->dev, "Out of memory\n"); 633 goto exit; 634 } 635 init_MUTEX(&dev->sem); 636 dev->intf = intf; 637 init_waitqueue_head(&dev->read_wait); 638 init_waitqueue_head(&dev->write_wait); 639 640 /* workaround for early firmware versions on fast computers */ 641 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && 642 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) || 643 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) && 644 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { 645 buffer = kmalloc(256, GFP_KERNEL); 646 if (buffer == NULL) { 647 dev_err(&intf->dev, "Couldn't allocate string buffer\n"); 648 goto error; 649 } 650 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ 651 usb_string(udev, 255, buffer, 256); 652 kfree(buffer); 653 } 654 655 iface_desc = intf->cur_altsetting; 656 657 /* set up the endpoint information */ 658 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 659 endpoint = &iface_desc->endpoint[i].desc; 660 661 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) && 662 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 663 dev->interrupt_in_endpoint = endpoint; 664 } 665 666 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) && 667 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 668 dev->interrupt_out_endpoint = endpoint; 669 } 670 } 671 if (dev->interrupt_in_endpoint == NULL) { 672 dev_err(&intf->dev, "Interrupt in endpoint not found\n"); 673 goto error; 674 } 675 if (dev->interrupt_out_endpoint == NULL) 676 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); 677 678 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); 679 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL); 680 if (!dev->ring_buffer) { 681 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n"); 682 goto error; 683 } 684 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 685 if (!dev->interrupt_in_buffer) { 686 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); 687 goto error; 688 } 689 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 690 if (!dev->interrupt_in_urb) { 691 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); 692 goto error; 693 } 694 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) : 695 udev->descriptor.bMaxPacketSize0; 696 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL); 697 if (!dev->interrupt_out_buffer) { 698 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); 699 goto error; 700 } 701 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 702 if (!dev->interrupt_out_urb) { 703 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); 704 goto error; 705 } 706 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 707 if (dev->interrupt_out_endpoint) 708 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 709 710 /* we can register the device now, as it is ready */ 711 usb_set_intfdata(intf, dev); 712 713 retval = usb_register_dev(intf, &ld_usb_class); 714 if (retval) { 715 /* something prevented us from registering this driver */ 716 dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 717 usb_set_intfdata(intf, NULL); 718 goto error; 719 } 720 721 /* let the user know what node this device is now attached to */ 722 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n", 723 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor); 724 725 exit: 726 return retval; 727 728 error: 729 ld_usb_delete(dev); 730 731 return retval; 732 } 733 734 /** 735 * ld_usb_disconnect 736 * 737 * Called by the usb core when the device is removed from the system. 738 */ 739 static void ld_usb_disconnect(struct usb_interface *intf) 740 { 741 struct ld_usb *dev; 742 int minor; 743 744 mutex_lock(&disconnect_mutex); 745 746 dev = usb_get_intfdata(intf); 747 usb_set_intfdata(intf, NULL); 748 749 down(&dev->sem); 750 751 minor = intf->minor; 752 753 /* give back our minor */ 754 usb_deregister_dev(intf, &ld_usb_class); 755 756 /* if the device is not opened, then we clean up right now */ 757 if (!dev->open_count) { 758 up(&dev->sem); 759 ld_usb_delete(dev); 760 } else { 761 dev->intf = NULL; 762 up(&dev->sem); 763 } 764 765 mutex_unlock(&disconnect_mutex); 766 767 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", 768 (minor - USB_LD_MINOR_BASE)); 769 } 770 771 /* usb specific object needed to register this driver with the usb subsystem */ 772 static struct usb_driver ld_usb_driver = { 773 .name = "ldusb", 774 .probe = ld_usb_probe, 775 .disconnect = ld_usb_disconnect, 776 .id_table = ld_usb_table, 777 }; 778 779 /** 780 * ld_usb_init 781 */ 782 static int __init ld_usb_init(void) 783 { 784 int retval; 785 786 /* register this driver with the USB subsystem */ 787 retval = usb_register(&ld_usb_driver); 788 if (retval) 789 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval); 790 791 return retval; 792 } 793 794 /** 795 * ld_usb_exit 796 */ 797 static void __exit ld_usb_exit(void) 798 { 799 /* deregister this driver with the USB subsystem */ 800 usb_deregister(&ld_usb_driver); 801 } 802 803 module_init(ld_usb_init); 804 module_exit(ld_usb_exit); 805 806