1/* 2 * Frontier Designs Alphatrack driver 3 * 4 * Copyright (C) 2007 Michael Taht (m@taht.net) 5 * 6 * Based on the usbled driver and ldusb drivers by 7 * 8 * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com) 9 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> 10 * 11 * The ldusb driver was, in turn, derived from Lego USB Tower driver 12 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> 13 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 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, version 2. 18 * 19 */ 20 21/** 22 * This driver uses a ring buffer for time critical reading of 23 * interrupt in reports and provides read and write methods for 24 * raw interrupt reports. 25 */ 26 27/* Note: this currently uses a dumb ringbuffer for reads and writes. 28 * A more optimal driver would cache and kill off outstanding urbs that are 29 * now invalid, and ignore ones that already were in the queue but valid 30 * as we only have 30 commands for the alphatrack. In particular this is 31 * key for getting lights to flash in time as otherwise many commands 32 * can be buffered up before the light change makes it to the interface. 33*/ 34 35#include <linux/kernel.h> 36#include <linux/errno.h> 37#include <linux/init.h> 38#include <linux/slab.h> 39#include <linux/module.h> 40#include <linux/kobject.h> 41#include <linux/mutex.h> 42 43#include <linux/uaccess.h> 44#include <linux/input.h> 45#include <linux/usb.h> 46#include <linux/poll.h> 47 48#include "alphatrack.h" 49 50#define VENDOR_ID 0x165b 51#define PRODUCT_ID 0xfad1 52 53#ifdef CONFIG_USB_DYNAMIC_MINORS 54#define USB_ALPHATRACK_MINOR_BASE 0 55#else 56/* FIXME 176 - is another driver's minor - apply for that */ 57#define USB_ALPHATRACK_MINOR_BASE 176 58#endif 59 60/* table of devices that work with this driver */ 61static const struct usb_device_id usb_alphatrack_table[] = { 62 {USB_DEVICE(VENDOR_ID, PRODUCT_ID)}, 63 {} /* Terminating entry */ 64}; 65 66MODULE_DEVICE_TABLE(usb, usb_alphatrack_table); 67MODULE_VERSION("0.41"); 68MODULE_AUTHOR("Mike Taht <m@taht.net>"); 69MODULE_DESCRIPTION("Alphatrack USB Driver"); 70MODULE_LICENSE("GPL"); 71MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface"); 72 73/* These aren't done yet */ 74 75#define SUPPRESS_EXTRA_ONLINE_EVENTS 0 76#define BUFFERED_WRITES 0 77#define SUPPRESS_EXTRA_OFFLINE_EVENTS 0 78#define COMPRESS_FADER_EVENTS 0 79 80#define BUFFERED_READS 1 81#define RING_BUFFER_SIZE 512 82#define WRITE_BUFFER_SIZE 34 83#define ALPHATRACK_USB_TIMEOUT 10 84#define OUTPUT_CMD_SIZE 8 85#define INPUT_CMD_SIZE 12 86#define ALPHATRACK_DEBUG 0 87 88static int debug = ALPHATRACK_DEBUG; 89 90/* Use our own dbg macro */ 91#define dbg_info(dev, format, arg...) do \ 92 { if (debug) dev_info(dev , format , ## arg); } while (0) 93 94#define alphatrack_ocmd_info(dev, cmd, format, arg...) 95 96#define alphatrack_icmd_info(dev, cmd, format, arg...) 97 98/* Module parameters */ 99 100module_param(debug, int, S_IRUGO | S_IWUSR); 101MODULE_PARM_DESC(debug, "Debug enabled or not"); 102 103/* All interrupt in transfers are collected in a ring buffer to 104 * avoid racing conditions and get better performance of the driver. 105 */ 106 107static int ring_buffer_size = RING_BUFFER_SIZE; 108 109module_param(ring_buffer_size, int, S_IRUGO); 110MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size"); 111 112/* The write_buffer can one day contain more than one interrupt out transfer. 113 */ 114 115static int write_buffer_size = WRITE_BUFFER_SIZE; 116module_param(write_buffer_size, int, S_IRUGO); 117MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); 118 119/* 120 * Increase the interval for debugging purposes. 121 * or set to 1 to use the standard interval from the endpoint descriptors. 122 */ 123 124static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT; 125module_param(min_interrupt_in_interval, int, 0); 126MODULE_PARM_DESC(min_interrupt_in_interval, 127 "Minimum interrupt in interval in ms"); 128 129static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT; 130module_param(min_interrupt_out_interval, int, 0); 131MODULE_PARM_DESC(min_interrupt_out_interval, 132 "Minimum interrupt out interval in ms"); 133 134/* Structure to hold all of our device specific stuff */ 135 136struct usb_alphatrack { 137 struct mutex mtx; /* locks this structure */ 138 struct usb_interface *intf; /* save off the usb interface pointer */ 139 int open_count; /* number of times this port has been opened */ 140 141 /* make gcc happy */ 142 struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE]; 143 struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE]; 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 unsigned char *interrupt_in_buffer; 151 unsigned char *oldi_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 atomic_t writes_pending; 167 int event; /* alternate interface to events */ 168 int fader; /* 10 bits */ 169 int lights; /* 23 bits */ 170 unsigned char dump_state; /* 0 if disabled 1 if enabled */ 171 unsigned char enable; /* 0 if disabled 1 if enabled */ 172 unsigned char offline; /* if the device is out of range or asleep */ 173 unsigned char verbose; /* be verbose in error reporting */ 174 unsigned char last_cmd[OUTPUT_CMD_SIZE]; 175 unsigned char screen[32]; 176}; 177 178/* prevent races between open() and disconnect() */ 179static DEFINE_MUTEX(disconnect_mutex); 180 181/* forward declaration */ 182 183static struct usb_driver usb_alphatrack_driver; 184 185/** 186 * usb_alphatrack_abort_transfers 187 * aborts transfers and frees associated data structures 188 */ 189static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev) 190{ 191 /* shutdown transfer */ 192 if (dev->interrupt_in_running) { 193 dev->interrupt_in_running = 0; 194 if (dev->intf) 195 usb_kill_urb(dev->interrupt_in_urb); 196 } 197 if (dev->interrupt_out_busy) 198 if (dev->intf) 199 usb_kill_urb(dev->interrupt_out_urb); 200} 201 202/** 203 * usb_alphatrack_delete 204 */ 205static void usb_alphatrack_delete(struct usb_alphatrack *dev) 206{ 207 usb_alphatrack_abort_transfers(dev); 208 usb_free_urb(dev->interrupt_in_urb); 209 usb_free_urb(dev->interrupt_out_urb); 210 kfree(dev->ring_buffer); 211 kfree(dev->interrupt_in_buffer); 212 kfree(dev->interrupt_out_buffer); 213 kfree(dev); /* fixme oldi_buffer */ 214} 215 216/** 217 * usb_alphatrack_interrupt_in_callback 218 */ 219 220static void usb_alphatrack_interrupt_in_callback(struct urb *urb) 221{ 222 struct usb_alphatrack *dev = urb->context; 223 unsigned int next_ring_head; 224 int retval = -1; 225 226 if (urb->status) { 227 if (urb->status == -ENOENT || 228 urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) { 229 goto exit; 230 } else { 231 dbg_info(&dev->intf->dev, 232 "%s: nonzero status received: %d\n", __func__, 233 urb->status); 234 goto resubmit; /* maybe we can recover */ 235 } 236 } 237 238 if (urb->actual_length != INPUT_CMD_SIZE) { 239 dev_warn(&dev->intf->dev, 240 "Urb length was %d bytes!!" 241 "Do something intelligent\n", urb->actual_length); 242 } else { 243 alphatrack_ocmd_info(&dev->intf->dev, 244 &(*dev->ring_buffer)[dev->ring_tail].cmd, 245 "%s", "bla"); 246 if (memcmp 247 (dev->interrupt_in_buffer, dev->oldi_buffer, 248 INPUT_CMD_SIZE) == 0) { 249 goto resubmit; 250 } 251 memcpy(dev->oldi_buffer, dev->interrupt_in_buffer, 252 INPUT_CMD_SIZE); 253 254#if SUPPRESS_EXTRA_OFFLINE_EVENTS 255 if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff) 256 goto resubmit; 257 if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) { 258 dev->offline = 2; 259 goto resubmit; 260 } 261/* Always pass one offline event up the stack */ 262 if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff) 263 dev->offline = 0; 264 if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff) 265 dev->offline = 1; 266#endif 267 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", 268 __func__, dev->ring_head, dev->ring_tail); 269 next_ring_head = (dev->ring_head + 1) % ring_buffer_size; 270 271 if (next_ring_head != dev->ring_tail) { 272 memcpy(&((*dev->ring_buffer)[dev->ring_head]), 273 dev->interrupt_in_buffer, urb->actual_length); 274 dev->ring_head = next_ring_head; 275 retval = 0; 276 memset(dev->interrupt_in_buffer, 0, urb->actual_length); 277 } else { 278 dev_warn(&dev->intf->dev, 279 "Ring buffer overflow, %d bytes dropped\n", 280 urb->actual_length); 281 memset(dev->interrupt_in_buffer, 0, urb->actual_length); 282 } 283 } 284 285resubmit: 286 /* resubmit if we're still running */ 287 if (dev->interrupt_in_running && dev->intf) { 288 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 289 if (retval) 290 dev_err(&dev->intf->dev, 291 "usb_submit_urb failed (%d)\n", retval); 292 } 293 294exit: 295 dev->interrupt_in_done = 1; 296 wake_up_interruptible(&dev->read_wait); 297} 298 299/** 300 * usb_alphatrack_interrupt_out_callback 301 */ 302static void usb_alphatrack_interrupt_out_callback(struct urb *urb) 303{ 304 struct usb_alphatrack *dev = urb->context; 305 306 /* sync/async unlink faults aren't errors */ 307 if (urb->status && !(urb->status == -ENOENT || 308 urb->status == -ECONNRESET || 309 urb->status == -ESHUTDOWN)) 310 dbg_info(&dev->intf->dev, 311 "%s - nonzero write interrupt status received: %d\n", 312 __func__, urb->status); 313 atomic_dec(&dev->writes_pending); 314 dev->interrupt_out_busy = 0; 315 wake_up_interruptible(&dev->write_wait); 316} 317 318/** 319 * usb_alphatrack_open 320 */ 321static int usb_alphatrack_open(struct inode *inode, struct file *file) 322{ 323 struct usb_alphatrack *dev; 324 int subminor; 325 int retval = 0; 326 struct usb_interface *interface; 327 328 nonseekable_open(inode, file); 329 subminor = iminor(inode); 330 331 mutex_lock(&disconnect_mutex); 332 333 interface = usb_find_interface(&usb_alphatrack_driver, subminor); 334 335 if (!interface) { 336 err("%s - error, can't find device for minor %d\n", 337 __func__, subminor); 338 retval = -ENODEV; 339 goto unlock_disconnect_exit; 340 } 341 342 dev = usb_get_intfdata(interface); 343 344 if (!dev) { 345 retval = -ENODEV; 346 goto unlock_disconnect_exit; 347 } 348 349 /* lock this device */ 350 if (mutex_lock_interruptible(&dev->mtx)) { 351 retval = -ERESTARTSYS; 352 goto unlock_disconnect_exit; 353 } 354 355 /* allow opening only once */ 356 if (dev->open_count) { 357 retval = -EBUSY; 358 goto unlock_exit; 359 } 360 dev->open_count = 1; 361 362 /* initialize in direction */ 363 dev->ring_head = 0; 364 dev->ring_tail = 0; 365 usb_fill_int_urb(dev->interrupt_in_urb, 366 interface_to_usbdev(interface), 367 usb_rcvintpipe(interface_to_usbdev(interface), 368 dev->interrupt_in_endpoint-> 369 bEndpointAddress), 370 dev->interrupt_in_buffer, 371 dev->interrupt_in_endpoint_size, 372 usb_alphatrack_interrupt_in_callback, dev, 373 dev->interrupt_in_interval); 374 375 dev->interrupt_in_running = 1; 376 dev->interrupt_in_done = 0; 377 dev->enable = 1; 378 dev->offline = 0; 379 380 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 381 if (retval) { 382 dev_err(&interface->dev, 383 "Couldn't submit interrupt_in_urb %d\n", retval); 384 dev->interrupt_in_running = 0; 385 dev->open_count = 0; 386 goto unlock_exit; 387 } 388 389 /* save device in the file's private structure */ 390 file->private_data = dev; 391 392unlock_exit: 393 mutex_unlock(&dev->mtx); 394 395unlock_disconnect_exit: 396 mutex_unlock(&disconnect_mutex); 397 398 return retval; 399} 400 401/** 402 * usb_alphatrack_release 403 */ 404static int usb_alphatrack_release(struct inode *inode, struct file *file) 405{ 406 struct usb_alphatrack *dev; 407 int retval = 0; 408 409 dev = file->private_data; 410 411 if (dev == NULL) { 412 retval = -ENODEV; 413 goto exit; 414 } 415 416 if (mutex_lock_interruptible(&dev->mtx)) { 417 retval = -ERESTARTSYS; 418 goto exit; 419 } 420 421 if (dev->open_count != 1) { 422 retval = -ENODEV; 423 goto unlock_exit; 424 } 425 426 if (dev->intf == NULL) { 427 /* the device was unplugged before the file was released */ 428 mutex_unlock(&dev->mtx); 429 /* unlock here as usb_alphatrack_delete frees dev */ 430 usb_alphatrack_delete(dev); 431 retval = -ENODEV; 432 goto exit; 433 } 434 435 /* wait until write transfer is finished */ 436 if (dev->interrupt_out_busy) 437 wait_event_interruptible_timeout(dev->write_wait, 438 !dev->interrupt_out_busy, 439 2 * HZ); 440 usb_alphatrack_abort_transfers(dev); 441 dev->open_count = 0; 442 443unlock_exit: 444 mutex_unlock(&dev->mtx); 445 446exit: 447 return retval; 448} 449 450/** 451 * usb_alphatrack_poll 452 */ 453static unsigned int usb_alphatrack_poll(struct file *file, poll_table *wait) 454{ 455 struct usb_alphatrack *dev; 456 unsigned int mask = 0; 457 458 dev = file->private_data; 459 460 poll_wait(file, &dev->read_wait, wait); 461 poll_wait(file, &dev->write_wait, wait); 462 463 if (dev->ring_head != dev->ring_tail) 464 mask |= POLLIN | POLLRDNORM; 465 if (!dev->interrupt_out_busy) 466 mask |= POLLOUT | POLLWRNORM; 467 468 return mask; 469} 470 471/** 472 * usb_alphatrack_read 473 */ 474static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer, 475 size_t count, loff_t *ppos) 476{ 477 struct usb_alphatrack *dev; 478 int retval = 0; 479 480 int c = 0; 481 482 dev = file->private_data; 483 484 /* verify that we actually have some data to read */ 485 if (count == 0) 486 goto exit; 487 488 /* lock this object */ 489 if (mutex_lock_interruptible(&dev->mtx)) { 490 retval = -ERESTARTSYS; 491 goto exit; 492 } 493 494 /* verify that the device wasn't unplugged */ 495 if (dev->intf == NULL) { 496 retval = -ENODEV; 497 err("No device or device unplugged %d\n", retval); 498 goto unlock_exit; 499 } 500 501 while (dev->ring_head == dev->ring_tail) { 502 if (file->f_flags & O_NONBLOCK) { 503 retval = -EAGAIN; 504 goto unlock_exit; 505 } 506 dev->interrupt_in_done = 0; 507 retval = 508 wait_event_interruptible(dev->read_wait, 509 dev->interrupt_in_done); 510 if (retval < 0) 511 goto unlock_exit; 512 } 513 514 alphatrack_ocmd_info(&dev->intf->dev, 515 &(*dev->ring_buffer)[dev->ring_tail].cmd, "%s", 516 ": copying to userspace"); 517 518 c = 0; 519 while ((c < count) && (dev->ring_tail != dev->ring_head)) { 520 if (copy_to_user 521 (&buffer[c], &(*dev->ring_buffer)[dev->ring_tail], 522 INPUT_CMD_SIZE)) { 523 retval = -EFAULT; 524 goto unlock_exit; 525 } 526 dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size; 527 c += INPUT_CMD_SIZE; 528 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", 529 __func__, dev->ring_head, dev->ring_tail); 530 } 531 retval = c; 532 533unlock_exit: 534 /* unlock the device */ 535 mutex_unlock(&dev->mtx); 536 537exit: 538 return retval; 539} 540 541/** 542 * usb_alphatrack_write 543 */ 544static ssize_t usb_alphatrack_write(struct file *file, 545 const char __user *buffer, size_t count, 546 loff_t *ppos) 547{ 548 struct usb_alphatrack *dev; 549 size_t bytes_to_write; 550 int retval = 0; 551 552 dev = file->private_data; 553 554 /* verify that we actually have some data to write */ 555 if (count == 0) 556 goto exit; 557 558 /* lock this object */ 559 if (mutex_lock_interruptible(&dev->mtx)) { 560 retval = -ERESTARTSYS; 561 goto exit; 562 } 563 564 /* verify that the device wasn't unplugged */ 565 if (dev->intf == NULL) { 566 retval = -ENODEV; 567 err("No device or device unplugged %d\n", retval); 568 goto unlock_exit; 569 } 570 571 /* wait until previous transfer is finished */ 572 if (dev->interrupt_out_busy) { 573 if (file->f_flags & O_NONBLOCK) { 574 retval = -EAGAIN; 575 goto unlock_exit; 576 } 577 retval = 578 wait_event_interruptible(dev->write_wait, 579 !dev->interrupt_out_busy); 580 if (retval < 0) 581 goto unlock_exit; 582 } 583 584 /* write the data into interrupt_out_buffer from userspace */ 585 /* FIXME - if you write more than 12 bytes this breaks */ 586 bytes_to_write = 587 min(count, write_buffer_size * dev->interrupt_out_endpoint_size); 588 if (bytes_to_write < count) 589 dev_warn(&dev->intf->dev, 590 "Write buffer overflow, %zd bytes dropped\n", 591 count - bytes_to_write); 592 593 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", 594 __func__, count, bytes_to_write); 595 596 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 597 retval = -EFAULT; 598 goto unlock_exit; 599 } 600 601 if (dev->interrupt_out_endpoint == NULL) { 602 err("Endpoint should not be be null!\n"); 603 goto unlock_exit; 604 } 605 606 /* send off the urb */ 607 usb_fill_int_urb(dev->interrupt_out_urb, 608 interface_to_usbdev(dev->intf), 609 usb_sndintpipe(interface_to_usbdev(dev->intf), 610 dev->interrupt_out_endpoint-> 611 bEndpointAddress), 612 dev->interrupt_out_buffer, bytes_to_write, 613 usb_alphatrack_interrupt_out_callback, dev, 614 dev->interrupt_out_interval); 615 dev->interrupt_out_busy = 1; 616 atomic_inc(&dev->writes_pending); 617 wmb(); 618 619 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 620 if (retval) { 621 dev->interrupt_out_busy = 0; 622 err("Couldn't submit interrupt_out_urb %d\n", retval); 623 atomic_dec(&dev->writes_pending); 624 goto unlock_exit; 625 } 626 retval = bytes_to_write; 627 628unlock_exit: 629 /* unlock the device */ 630 mutex_unlock(&dev->mtx); 631 632exit: 633 return retval; 634} 635 636/* file operations needed when we register this driver */ 637static const struct file_operations usb_alphatrack_fops = { 638 .owner = THIS_MODULE, 639 .read = usb_alphatrack_read, 640 .write = usb_alphatrack_write, 641 .open = usb_alphatrack_open, 642 .release = usb_alphatrack_release, 643 .poll = usb_alphatrack_poll, 644 .llseek = no_llseek, 645}; 646 647/* 648 * usb class driver info in order to get a minor number from the usb core, 649 * and to have the device registered with the driver core 650 */ 651 652static struct usb_class_driver usb_alphatrack_class = { 653 .name = "alphatrack%d", 654 .fops = &usb_alphatrack_fops, 655 .minor_base = USB_ALPHATRACK_MINOR_BASE, 656}; 657 658/** 659 * usb_alphatrack_probe 660 * 661 * Called by the usb core when a new device is connected that it thinks 662 * this driver might be interested in. 663 */ 664static int usb_alphatrack_probe(struct usb_interface *intf, 665 const struct usb_device_id *id) 666{ 667 struct usb_device *udev = interface_to_usbdev(intf); 668 struct usb_alphatrack *dev = NULL; 669 struct usb_host_interface *iface_desc; 670 struct usb_endpoint_descriptor *endpoint; 671 int i; 672 int true_size; 673 int retval = -ENOMEM; 674 675 /* allocate memory for our device state and initialize it */ 676 677 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 678 if (dev == NULL) { 679 dev_err(&intf->dev, "Out of memory\n"); 680 goto exit; 681 } 682 mutex_init(&dev->mtx); 683 dev->intf = intf; 684 init_waitqueue_head(&dev->read_wait); 685 init_waitqueue_head(&dev->write_wait); 686 687 iface_desc = intf->cur_altsetting; 688 689 /* set up the endpoint information */ 690 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 691 endpoint = &iface_desc->endpoint[i].desc; 692 693 if (usb_endpoint_is_int_in(endpoint)) 694 dev->interrupt_in_endpoint = endpoint; 695 696 if (usb_endpoint_is_int_out(endpoint)) 697 dev->interrupt_out_endpoint = endpoint; 698 } 699 if (dev->interrupt_in_endpoint == NULL) { 700 dev_err(&intf->dev, "Interrupt in endpoint not found\n"); 701 goto error; 702 } 703 if (dev->interrupt_out_endpoint == NULL) 704 dev_warn(&intf->dev, 705 "Interrupt out endpoint not found" 706 "(using control endpoint instead)\n"); 707 708 dev->interrupt_in_endpoint_size = 709 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); 710 711 if (dev->interrupt_in_endpoint_size != 64) 712 dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n"); 713 714 if (ring_buffer_size == 0) 715 ring_buffer_size = RING_BUFFER_SIZE; 716 717 true_size = min(ring_buffer_size, RING_BUFFER_SIZE); 718 719 /* FIXME - there are more usb_alloc routines for dma correctness. 720 Needed? */ 721 dev->ring_buffer = 722 kmalloc((true_size * sizeof(struct alphatrack_icmd)), GFP_KERNEL); 723 724 if (!dev->ring_buffer) { 725 dev_err(&intf->dev, 726 "Couldn't allocate input ring_buffer of size %d\n", 727 true_size); 728 goto error; 729 } 730 731 dev->interrupt_in_buffer = 732 kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 733 734 if (!dev->interrupt_in_buffer) { 735 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); 736 goto error; 737 } 738 dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 739 if (!dev->oldi_buffer) { 740 dev_err(&intf->dev, "Couldn't allocate old buffer\n"); 741 goto error; 742 } 743 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 744 if (!dev->interrupt_in_urb) { 745 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); 746 goto error; 747 } 748 749 dev->interrupt_out_endpoint_size = 750 dev->interrupt_out_endpoint ? le16_to_cpu(dev-> 751 interrupt_out_endpoint-> 752 wMaxPacketSize) : udev-> 753 descriptor.bMaxPacketSize0; 754 755 if (dev->interrupt_out_endpoint_size != 64) 756 dev_warn(&intf->dev, 757 "Interrupt out endpoint size is not 64!)\n"); 758 759 if (write_buffer_size == 0) 760 write_buffer_size = WRITE_BUFFER_SIZE; 761 true_size = min(write_buffer_size, WRITE_BUFFER_SIZE); 762 763 dev->interrupt_out_buffer = 764 kmalloc(true_size * dev->interrupt_out_endpoint_size, GFP_KERNEL); 765 766 if (!dev->interrupt_out_buffer) { 767 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); 768 goto error; 769 } 770 771 dev->write_buffer = 772 kmalloc(true_size * sizeof(struct alphatrack_ocmd), GFP_KERNEL); 773 774 if (!dev->write_buffer) { 775 dev_err(&intf->dev, "Couldn't allocate write_buffer\n"); 776 goto error; 777 } 778 779 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 780 if (!dev->interrupt_out_urb) { 781 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); 782 goto error; 783 } 784 dev->interrupt_in_interval = 785 min_interrupt_in_interval > 786 dev->interrupt_in_endpoint-> 787 bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint-> 788 bInterval; 789 if (dev->interrupt_out_endpoint) 790 dev->interrupt_out_interval = 791 min_interrupt_out_interval > 792 dev->interrupt_out_endpoint-> 793 bInterval ? min_interrupt_out_interval : dev-> 794 interrupt_out_endpoint->bInterval; 795 796 /* we can register the device now, as it is ready */ 797 usb_set_intfdata(intf, dev); 798 799 atomic_set(&dev->writes_pending, 0); 800 retval = usb_register_dev(intf, &usb_alphatrack_class); 801 if (retval) { 802 /* something prevented us from registering this driver */ 803 dev_err(&intf->dev, 804 "Not able to get a minor for this device.\n"); 805 usb_set_intfdata(intf, NULL); 806 goto error; 807 } 808 809 /* let the user know what node this device is now attached to */ 810 dev_info(&intf->dev, 811 "Alphatrack Device #%d now attached to major %d minor %d\n", 812 (intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR, 813 intf->minor); 814 815exit: 816 return retval; 817 818error: 819 usb_alphatrack_delete(dev); 820 821 return retval; 822} 823 824/** 825 * usb_alphatrack_disconnect 826 * 827 * Called by the usb core when the device is removed from the system. 828 */ 829static void usb_alphatrack_disconnect(struct usb_interface *intf) 830{ 831 struct usb_alphatrack *dev; 832 int minor; 833 834 mutex_lock(&disconnect_mutex); 835 836 dev = usb_get_intfdata(intf); 837 usb_set_intfdata(intf, NULL); 838 839 mutex_lock(&dev->mtx); 840 841 minor = intf->minor; 842 843 /* give back our minor */ 844 usb_deregister_dev(intf, &usb_alphatrack_class); 845 846 /* if the device is not opened, then we clean up right now */ 847 if (!dev->open_count) { 848 mutex_unlock(&dev->mtx); 849 usb_alphatrack_delete(dev); 850 } else { 851 dev->intf = NULL; 852 mutex_unlock(&dev->mtx); 853 } 854 855 atomic_set(&dev->writes_pending, 0); 856 mutex_unlock(&disconnect_mutex); 857 858 dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n", 859 (minor - USB_ALPHATRACK_MINOR_BASE)); 860} 861 862/* usb specific object needed to register this driver with the usb subsystem */ 863static struct usb_driver usb_alphatrack_driver = { 864 .name = "alphatrack", 865 .probe = usb_alphatrack_probe, 866 .disconnect = usb_alphatrack_disconnect, 867 .id_table = usb_alphatrack_table, 868}; 869 870module_usb_driver(usb_alphatrack_driver); 871