Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 | /*
* Frontier Designs Tranzport driver
*
* Copyright (C) 2007 Michael Taht (m@taht.net)
*
* Based on the usbled driver and ldusb drivers by
*
* Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
*
* The ldusb driver was, in turn, derived from Lego USB Tower driver
* Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
* 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*
*/
/*
* This driver uses a ring buffer for time critical reading of
* interrupt in reports and provides read and write methods for
* raw interrupt reports.
*/
/* Note: this currently uses a dumb ringbuffer for reads and writes.
* A more optimal driver would cache and kill off outstanding urbs that are
* now invalid, and ignore ones that already were in the queue but valid
* as we only have 17 commands for the tranzport. In particular this is
* key for getting lights to flash in time as otherwise many commands
* can be buffered up before the light change makes it to the interface.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/poll.h>
/* Define these values to match your devices */
#define VENDOR_ID 0x165b
#define PRODUCT_ID 0x8101
#ifdef CONFIG_USB_DYNAMIC_MINORS
#define USB_TRANZPORT_MINOR_BASE 0
#else /* FIXME 177- is the another driver's minor - apply for a minor soon */
#define USB_TRANZPORT_MINOR_BASE 177
#endif
/* table of devices that work with this driver */
static const struct usb_device_id usb_tranzport_table[] = {
{USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_tranzport_table);
MODULE_VERSION("0.35");
MODULE_AUTHOR("Mike Taht <m@taht.net>");
MODULE_DESCRIPTION("Tranzport USB Driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("Frontier Designs Tranzport Control Surface");
#define SUPPRESS_EXTRA_OFFLINE_EVENTS 1
#define COMPRESS_WHEEL_EVENTS 1
#define BUFFERED_READS 1
#define RING_BUFFER_SIZE 1000
#define WRITE_BUFFER_SIZE 34
#define TRANZPORT_USB_TIMEOUT 10
#define TRANZPORT_DEBUG 0
static int debug = TRANZPORT_DEBUG;
/* Use our own dbg macro */
#define dbg_info(dev, format, arg...) do \
{ if (debug) dev_info(dev , format , ## arg); } while (0)
/* Module parameters */
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
/* All interrupt in transfers are collected in a ring buffer to
* avoid racing conditions and get better performance of the driver.
*/
static int ring_buffer_size = RING_BUFFER_SIZE;
module_param(ring_buffer_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
/* The write_buffer can one day contain more than one interrupt out transfer.
*/
static int write_buffer_size = WRITE_BUFFER_SIZE;
module_param(write_buffer_size, int, S_IRUGO);
MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
/*
* Increase the interval for debugging purposes.
* or set to 1 to use the standard interval from the endpoint descriptors.
*/
static int min_interrupt_in_interval = TRANZPORT_USB_TIMEOUT;
module_param(min_interrupt_in_interval, int, 0);
MODULE_PARM_DESC(min_interrupt_in_interval,
"Minimum interrupt in interval in ms");
static int min_interrupt_out_interval = TRANZPORT_USB_TIMEOUT;
module_param(min_interrupt_out_interval, int, 0);
MODULE_PARM_DESC(min_interrupt_out_interval,
"Minimum interrupt out interval in ms");
struct tranzport_cmd {
unsigned char cmd[8];
};
/* Structure to hold all of our device specific stuff */
struct usb_tranzport {
struct mutex mtx; /* locks this structure */
struct usb_interface *intf; /* save off the usb interface pointer */
int open_count; /* number of times this port opened */
struct tranzport_cmd (*ring_buffer)[RING_BUFFER_SIZE];
unsigned int ring_head;
unsigned int ring_tail;
wait_queue_head_t read_wait;
wait_queue_head_t write_wait;
unsigned char *interrupt_in_buffer;
struct usb_endpoint_descriptor *interrupt_in_endpoint;
struct urb *interrupt_in_urb;
int interrupt_in_interval;
size_t interrupt_in_endpoint_size;
int interrupt_in_running;
int interrupt_in_done;
char *interrupt_out_buffer;
struct usb_endpoint_descriptor *interrupt_out_endpoint;
struct urb *interrupt_out_urb;
int interrupt_out_interval;
size_t interrupt_out_endpoint_size;
int interrupt_out_busy;
/* Sysfs support */
unsigned char enable; /* 0 if disabled 1 if enabled */
unsigned char offline; /* if the device is out of range or asleep */
unsigned char compress_wheel; /* flag to compress wheel events */
};
/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);
static struct usb_driver usb_tranzport_driver;
/**
* usb_tranzport_abort_transfers
* aborts transfers and frees associated data structures
*/
static void usb_tranzport_abort_transfers(struct usb_tranzport *dev)
{
/* shutdown transfer */
if (dev->interrupt_in_running) {
dev->interrupt_in_running = 0;
if (dev->intf)
usb_kill_urb(dev->interrupt_in_urb);
}
if (dev->interrupt_out_busy)
if (dev->intf)
usb_kill_urb(dev->interrupt_out_urb);
}
#define show_int(value) \
static ssize_t show_##value(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_tranzport *t = usb_get_intfdata(intf); \
return sprintf(buf, "%d\n", t->value); \
} \
static DEVICE_ATTR(value, S_IRUGO, show_##value, NULL);
#define show_set_int(value) \
static ssize_t show_##value(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_tranzport *t = usb_get_intfdata(intf); \
return sprintf(buf, "%d\n", t->value); \
} \
static ssize_t set_##value(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_tranzport *t = usb_get_intfdata(intf); \
unsigned long temp; \
if (strict_strtoul(buf, 10, &temp)) \
return -EINVAL; \
t->value = temp; \
return count; \
} \
static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##value);
show_int(enable);
show_int(offline);
show_set_int(compress_wheel);
/**
* usb_tranzport_delete
*/
static void usb_tranzport_delete(struct usb_tranzport *dev)
{
usb_tranzport_abort_transfers(dev);
if (dev->intf != NULL) {
device_remove_file(&dev->intf->dev, &dev_attr_enable);
device_remove_file(&dev->intf->dev, &dev_attr_offline);
device_remove_file(&dev->intf->dev, &dev_attr_compress_wheel);
}
/* free data structures */
usb_free_urb(dev->interrupt_in_urb);
usb_free_urb(dev->interrupt_out_urb);
kfree(dev->ring_buffer);
kfree(dev->interrupt_in_buffer);
kfree(dev->interrupt_out_buffer);
kfree(dev);
}
/**
* usb_tranzport_interrupt_in_callback
*/
static void usb_tranzport_interrupt_in_callback(struct urb *urb)
{
struct usb_tranzport *dev = urb->context;
unsigned int next_ring_head;
int retval = -1;
if (urb->status) {
if (urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN) {
goto exit;
} else {
dbg_info(&dev->intf->dev,
"%s: nonzero status received: %d\n",
__func__, urb->status);
goto resubmit; /* maybe we can recover */
}
}
if (urb->actual_length != 8) {
dev_warn(&dev->intf->dev,
"Urb length was %d bytes!!"
"Do something intelligent\n",
urb->actual_length);
} else {
dbg_info(&dev->intf->dev,
"%s: received: %02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__, dev->interrupt_in_buffer[0],
dev->interrupt_in_buffer[1],
dev->interrupt_in_buffer[2],
dev->interrupt_in_buffer[3],
dev->interrupt_in_buffer[4],
dev->interrupt_in_buffer[5],
dev->interrupt_in_buffer[6],
dev->interrupt_in_buffer[7]);
#if SUPPRESS_EXTRA_OFFLINE_EVENTS
if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
goto resubmit;
if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
dev->offline = 2;
goto resubmit;
}
/* Always pass one offline event up the stack */
if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
dev->offline = 0;
if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
dev->offline = 1;
#endif /* SUPPRESS_EXTRA_OFFLINE_EVENTS */
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
if (next_ring_head != dev->ring_tail) {
memcpy(&((*dev->ring_buffer)[dev->ring_head]),
dev->interrupt_in_buffer, urb->actual_length);
dev->ring_head = next_ring_head;
retval = 0;
memset(dev->interrupt_in_buffer, 0, urb->actual_length);
} else {
dev_warn(&dev->intf->dev,
"Ring buffer overflow, %d bytes dropped\n",
urb->actual_length);
memset(dev->interrupt_in_buffer, 0, urb->actual_length);
}
}
resubmit:
/* resubmit if we're still running */
if (dev->interrupt_in_running && dev->intf) {
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
if (retval)
dev_err(&dev->intf->dev,
"usb_submit_urb failed (%d)\n", retval);
}
exit:
dev->interrupt_in_done = 1;
wake_up_interruptible(&dev->read_wait);
}
/**
* usb_tranzport_interrupt_out_callback
*/
static void usb_tranzport_interrupt_out_callback(struct urb *urb)
{
struct usb_tranzport *dev = urb->context;
/* sync/async unlink faults aren't errors */
if (urb->status && !(urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN))
dbg_info(&dev->intf->dev,
"%s - nonzero write interrupt status received: %d\n",
__func__, urb->status);
dev->interrupt_out_busy = 0;
wake_up_interruptible(&dev->write_wait);
}
/**
* usb_tranzport_open
*/
static int usb_tranzport_open(struct inode *inode, struct file *file)
{
struct usb_tranzport *dev;
int subminor;
int retval = 0;
struct usb_interface *interface;
nonseekable_open(inode, file);
subminor = iminor(inode);
mutex_lock(&disconnect_mutex);
interface = usb_find_interface(&usb_tranzport_driver, subminor);
if (!interface) {
err("%s - error, can't find device for minor %d\n",
__func__, subminor);
retval = -ENODEV;
goto unlock_disconnect_exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto unlock_disconnect_exit;
}
/* lock this device */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto unlock_disconnect_exit;
}
/* allow opening only once */
if (dev->open_count) {
retval = -EBUSY;
goto unlock_exit;
}
dev->open_count = 1;
/* initialize in direction */
dev->ring_head = 0;
dev->ring_tail = 0;
usb_fill_int_urb(dev->interrupt_in_urb,
interface_to_usbdev(interface),
usb_rcvintpipe(interface_to_usbdev(interface),
dev->interrupt_in_endpoint->
bEndpointAddress),
dev->interrupt_in_buffer,
dev->interrupt_in_endpoint_size,
usb_tranzport_interrupt_in_callback, dev,
dev->interrupt_in_interval);
dev->interrupt_in_running = 1;
dev->interrupt_in_done = 0;
dev->enable = 1;
dev->offline = 0;
dev->compress_wheel = 1;
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
if (retval) {
dev_err(&interface->dev,
"Couldn't submit interrupt_in_urb %d\n", retval);
dev->interrupt_in_running = 0;
dev->open_count = 0;
goto unlock_exit;
}
/* save device in the file's private structure */
file->private_data = dev;
unlock_exit:
mutex_unlock(&dev->mtx);
unlock_disconnect_exit:
mutex_unlock(&disconnect_mutex);
return retval;
}
/**
* usb_tranzport_release
*/
static int usb_tranzport_release(struct inode *inode, struct file *file)
{
struct usb_tranzport *dev;
int retval = 0;
dev = file->private_data;
if (dev == NULL) {
retval = -ENODEV;
goto exit;
}
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
if (dev->open_count != 1) {
retval = -ENODEV;
goto unlock_exit;
}
if (dev->intf == NULL) {
/* the device was unplugged before the file was released */
mutex_unlock(&dev->mtx);
/* unlock here as usb_tranzport_delete frees dev */
usb_tranzport_delete(dev);
retval = -ENODEV;
goto exit;
}
/* wait until write transfer is finished */
if (dev->interrupt_out_busy)
wait_event_interruptible_timeout(dev->write_wait,
!dev->interrupt_out_busy,
2 * HZ);
usb_tranzport_abort_transfers(dev);
dev->open_count = 0;
unlock_exit:
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/**
* usb_tranzport_poll
*/
static unsigned int usb_tranzport_poll(struct file *file, poll_table * wait)
{
struct usb_tranzport *dev;
unsigned int mask = 0;
dev = file->private_data;
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
if (dev->ring_head != dev->ring_tail)
mask |= POLLIN | POLLRDNORM;
if (!dev->interrupt_out_busy)
mask |= POLLOUT | POLLWRNORM;
return mask;
}
/**
* usb_tranzport_read
*/
static ssize_t usb_tranzport_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
struct usb_tranzport *dev;
int retval = 0;
#if BUFFERED_READS
int c = 0;
#endif
#if COMPRESS_WHEEL_EVENTS
signed char oldwheel;
signed char newwheel;
int cancompress = 1;
int next_tail;
#endif
/* do I have such a thing as a null event? */
dev = file->private_data;
/* verify that we actually have some data to read */
if (count == 0)
goto exit;
/* lock this object */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
/* verify that the device wasn't unplugged */ if (dev->intf == NULL) {
retval = -ENODEV;
err("No device or device unplugged %d\n", retval);
goto unlock_exit;
}
while (dev->ring_head == dev->ring_tail) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto unlock_exit;
}
/* tiny race - FIXME: make atomic? */
/* atomic_cmp_exchange(&dev->interrupt_in_done,0,0); */
dev->interrupt_in_done = 0;
retval = wait_event_interruptible(dev->read_wait,
dev->interrupt_in_done);
if (retval < 0)
goto unlock_exit;
}
dbg_info(&dev->intf->dev,
"%s: copying to userspace: "
"%02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__,
(*dev->ring_buffer)[dev->ring_tail].cmd[0],
(*dev->ring_buffer)[dev->ring_tail].cmd[1],
(*dev->ring_buffer)[dev->ring_tail].cmd[2],
(*dev->ring_buffer)[dev->ring_tail].cmd[3],
(*dev->ring_buffer)[dev->ring_tail].cmd[4],
(*dev->ring_buffer)[dev->ring_tail].cmd[5],
(*dev->ring_buffer)[dev->ring_tail].cmd[6],
(*dev->ring_buffer)[dev->ring_tail].cmd[7]);
#if BUFFERED_READS
c = 0;
while ((c < count) && (dev->ring_tail != dev->ring_head)) {
#if COMPRESS_WHEEL_EVENTS
next_tail = (dev->ring_tail+1) % ring_buffer_size;
if (dev->compress_wheel)
cancompress = 1;
while (dev->ring_head != next_tail && cancompress == 1) {
newwheel = (*dev->ring_buffer)[next_tail].cmd[6];
oldwheel = (*dev->ring_buffer)[dev->ring_tail].cmd[6];
/* if both are wheel events, and
no buttons have changes (FIXME, do I have to check?),
and we are the same sign, we can compress +- 7F
*/
dbg_info(&dev->intf->dev,
"%s: trying to compress: "
"%02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__,
(*dev->ring_buffer)[dev->ring_tail].cmd[0],
(*dev->ring_buffer)[dev->ring_tail].cmd[1],
(*dev->ring_buffer)[dev->ring_tail].cmd[2],
(*dev->ring_buffer)[dev->ring_tail].cmd[3],
(*dev->ring_buffer)[dev->ring_tail].cmd[4],
(*dev->ring_buffer)[dev->ring_tail].cmd[5],
(*dev->ring_buffer)[dev->ring_tail].cmd[6],
(*dev->ring_buffer)[dev->ring_tail].cmd[7]);
if (((*dev->ring_buffer)[dev->ring_tail].cmd[6] != 0 &&
(*dev->ring_buffer)[next_tail].cmd[6] != 0) &&
((newwheel > 0 && oldwheel > 0) ||
(newwheel < 0 && oldwheel < 0)) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[2] ==
(*dev->ring_buffer)[next_tail].cmd[2]) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[3] ==
(*dev->ring_buffer)[next_tail].cmd[3]) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[4] ==
(*dev->ring_buffer)[next_tail].cmd[4]) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[5] ==
(*dev->ring_buffer)[next_tail].cmd[5])) {
dbg_info(&dev->intf->dev,
"%s: should compress: "
"%02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__,
(*dev->ring_buffer)[dev->ring_tail].
cmd[0],
(*dev->ring_buffer)[dev->ring_tail].
cmd[1],
(*dev->ring_buffer)[dev->ring_tail].
cmd[2],
(*dev->ring_buffer)[dev->ring_tail].
cmd[3],
(*dev->ring_buffer)[dev->ring_tail].
cmd[4],
(*dev->ring_buffer)[dev->ring_tail].
cmd[5],
(*dev->ring_buffer)[dev->ring_tail].
cmd[6],
(*dev->ring_buffer)[dev->ring_tail].
cmd[7]);
newwheel += oldwheel;
if (oldwheel > 0 && !(newwheel > 0)) {
newwheel = 0x7f;
cancompress = 0;
}
if (oldwheel < 0 && !(newwheel < 0)) {
newwheel = 0x80;
cancompress = 0;
}
(*dev->ring_buffer)[next_tail].cmd[6] =
newwheel;
dev->ring_tail = next_tail;
next_tail =
(dev->ring_tail + 1) % ring_buffer_size;
} else {
cancompress = 0;
}
}
#endif /* COMPRESS_WHEEL_EVENTS */
if (copy_to_user(
&buffer[c],
&(*dev->ring_buffer)[dev->ring_tail], 8)) {
retval = -EFAULT;
goto unlock_exit;
}
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
c += 8;
dbg_info(&dev->intf->dev,
"%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
}
retval = c;
#else
/* if (copy_to_user(buffer, &(*dev->ring_buffer)[dev->ring_tail], 8)) { */
retval = -EFAULT;
goto unlock_exit;
}
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
retval = 8;
#endif /* BUFFERED_READS */
unlock_exit:
/* unlock the device */
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/**
* usb_tranzport_write
*/
static ssize_t usb_tranzport_write(struct file *file,
const char __user *buffer, size_t count,
loff_t *ppos)
{
struct usb_tranzport *dev;
size_t bytes_to_write;
int retval = 0;
dev = file->private_data;
/* verify that we actually have some data to write */
if (count == 0)
goto exit;
/* lock this object */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
/* verify that the device wasn't unplugged */
if (dev->intf == NULL) {
retval = -ENODEV;
err("No device or device unplugged %d\n", retval);
goto unlock_exit;
}
/* wait until previous transfer is finished */
if (dev->interrupt_out_busy) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto unlock_exit;
}
retval = wait_event_interruptible(dev->write_wait,
!dev->interrupt_out_busy);
if (retval < 0)
goto unlock_exit;
}
/* write the data into interrupt_out_buffer from userspace */
bytes_to_write = min(count,
write_buffer_size *
dev->interrupt_out_endpoint_size);
if (bytes_to_write < count)
dev_warn(&dev->intf->dev,
"Write buffer overflow, %zd bytes dropped\n",
count - bytes_to_write);
dbg_info(&dev->intf->dev,
"%s: count = %zd, bytes_to_write = %zd\n", __func__,
count, bytes_to_write);
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
retval = -EFAULT;
goto unlock_exit;
}
if (dev->interrupt_out_endpoint == NULL) {
err("Endpoint should not be be null!\n");
goto unlock_exit;
}
/* send off the urb */
usb_fill_int_urb(dev->interrupt_out_urb,
interface_to_usbdev(dev->intf),
usb_sndintpipe(interface_to_usbdev(dev->intf),
dev->interrupt_out_endpoint->
bEndpointAddress),
dev->interrupt_out_buffer, bytes_to_write,
usb_tranzport_interrupt_out_callback, dev,
dev->interrupt_out_interval);
dev->interrupt_out_busy = 1;
wmb();
retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
if (retval) {
dev->interrupt_out_busy = 0;
err("Couldn't submit interrupt_out_urb %d\n", retval);
goto unlock_exit;
}
retval = bytes_to_write;
unlock_exit:
/* unlock the device */
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/* file operations needed when we register this driver */
static const struct file_operations usb_tranzport_fops = {
.owner = THIS_MODULE,
.read = usb_tranzport_read,
.write = usb_tranzport_write,
.open = usb_tranzport_open,
.release = usb_tranzport_release,
.poll = usb_tranzport_poll,
};
/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with the driver core
*/
static struct usb_class_driver usb_tranzport_class = {
.name = "tranzport%d",
.fops = &usb_tranzport_fops,
.minor_base = USB_TRANZPORT_MINOR_BASE,
};
/**
* usb_tranzport_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static int usb_tranzport_probe(struct usb_interface *intf,
const struct usb_device_id *id) {
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_tranzport *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int i;
int true_size;
int retval = -ENOMEM;
/* allocate memory for our device state and intialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&intf->dev, "Out of memory\n");
goto exit;
}
mutex_init(&dev->mtx);
dev->intf = intf;
init_waitqueue_head(&dev->read_wait);
init_waitqueue_head(&dev->write_wait);
iface_desc = intf->cur_altsetting;
/* set up the endpoint information */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (usb_endpoint_is_int_in(endpoint))
dev->interrupt_in_endpoint = endpoint;
if (usb_endpoint_is_int_out(endpoint))
dev->interrupt_out_endpoint = endpoint;
}
if (dev->interrupt_in_endpoint == NULL) {
dev_err(&intf->dev, "Interrupt in endpoint not found\n");
goto error;
}
if (dev->interrupt_out_endpoint == NULL)
dev_warn(&intf->dev,
"Interrupt out endpoint not found"
"(using control endpoint instead)\n");
dev->interrupt_in_endpoint_size =
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
if (dev->interrupt_in_endpoint_size != 8)
dev_warn(&intf->dev, "Interrupt in endpoint size is not 8!\n");
if (ring_buffer_size == 0)
ring_buffer_size = RING_BUFFER_SIZE;
true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
/* FIXME - there are more usb_alloc routines for dma correctness.
Needed? */
dev->ring_buffer =
kmalloc((true_size * sizeof(struct tranzport_cmd)) + 8, GFP_KERNEL);
if (!dev->ring_buffer) {
dev_err(&intf->dev,
"Couldn't allocate ring_buffer size %d\n", true_size);
goto error;
}
dev->interrupt_in_buffer =
kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
if (!dev->interrupt_in_buffer) {
dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
goto error;
}
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_in_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
goto error;
}
dev->interrupt_out_endpoint_size =
dev->interrupt_out_endpoint ?
le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
udev->descriptor.bMaxPacketSize0;
if (dev->interrupt_out_endpoint_size != 8)
dev_warn(&intf->dev,
"Interrupt out endpoint size is not 8!)\n");
dev->interrupt_out_buffer =
kmalloc(write_buffer_size * dev->interrupt_out_endpoint_size,
GFP_KERNEL);
if (!dev->interrupt_out_buffer) {
dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
goto error;
}
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_out_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
goto error;
}
dev->interrupt_in_interval =
min_interrupt_in_interval >
dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval
: dev->interrupt_in_endpoint->bInterval;
if (dev->interrupt_out_endpoint) {
dev->interrupt_out_interval =
min_interrupt_out_interval >
dev->interrupt_out_endpoint->bInterval ?
min_interrupt_out_interval :
dev->interrupt_out_endpoint->bInterval;
}
/* we can register the device now, as it is ready */
usb_set_intfdata(intf, dev);
retval = usb_register_dev(intf, &usb_tranzport_class);
if (retval) {
/* something prevented us from registering this driver */
dev_err(&intf->dev,
"Not able to get a minor for this device.\n");
usb_set_intfdata(intf, NULL);
goto error;
}
retval = device_create_file(&intf->dev, &dev_attr_compress_wheel);
if (retval)
goto error;
retval = device_create_file(&intf->dev, &dev_attr_enable);
if (retval)
goto error;
retval = device_create_file(&intf->dev, &dev_attr_offline);
if (retval)
goto error;
/* let the user know what node this device is now attached to */
dev_info(&intf->dev,
"Tranzport Device #%d now attached to major %d minor %d\n",
(intf->minor - USB_TRANZPORT_MINOR_BASE), USB_MAJOR,
intf->minor);
exit:
return retval;
error:
usb_tranzport_delete(dev);
return retval;
}
/**
* usb_tranzport_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void usb_tranzport_disconnect(struct usb_interface *intf)
{
struct usb_tranzport *dev;
int minor;
mutex_lock(&disconnect_mutex);
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
mutex_lock(&dev->mtx);
minor = intf->minor;
/* give back our minor */
usb_deregister_dev(intf, &usb_tranzport_class);
/* if the device is not opened, then we clean up right now */
if (!dev->open_count) {
mutex_unlock(&dev->mtx);
usb_tranzport_delete(dev);
} else {
dev->intf = NULL;
mutex_unlock(&dev->mtx);
}
mutex_unlock(&disconnect_mutex);
dev_info(&intf->dev, "Tranzport Surface #%d now disconnected\n",
(minor - USB_TRANZPORT_MINOR_BASE));
}
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver usb_tranzport_driver = {
.name = "tranzport",
.probe = usb_tranzport_probe,
.disconnect = usb_tranzport_disconnect,
.id_table = usb_tranzport_table,
};
/**
* usb_tranzport_init
*/
static int __init usb_tranzport_init(void)
{
int retval;
/* register this driver with the USB subsystem */
retval = usb_register(&usb_tranzport_driver);
if (retval)
err("usb_register failed for the " __FILE__
" driver. Error number %d\n", retval);
return retval;
}
/**
* usb_tranzport_exit
*/
static void __exit usb_tranzport_exit(void)
{
/* deregister this driver with the USB subsystem */
usb_deregister(&usb_tranzport_driver);
}
module_init(usb_tranzport_init);
module_exit(usb_tranzport_exit);
|