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