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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 | // SPDX-License-Identifier: GPL-2.0
/*
* USB Raw Gadget driver.
* See Documentation/usb/raw-gadget.rst for more details.
*
* Andrey Konovalov <andreyknvl@gmail.com>
*/
#include <linux/compiler.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/kref.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/semaphore.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/wait.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/ch11.h>
#include <linux/usb/gadget.h>
#include <uapi/linux/usb/raw_gadget.h>
#define DRIVER_DESC "USB Raw Gadget"
#define DRIVER_NAME "raw-gadget"
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Andrey Konovalov");
MODULE_LICENSE("GPL");
/*----------------------------------------------------------------------*/
#define RAW_EVENT_QUEUE_SIZE 16
struct raw_event_queue {
/* See the comment in raw_event_queue_fetch() for locking details. */
spinlock_t lock;
struct semaphore sema;
struct usb_raw_event *events[RAW_EVENT_QUEUE_SIZE];
int size;
};
static void raw_event_queue_init(struct raw_event_queue *queue)
{
spin_lock_init(&queue->lock);
sema_init(&queue->sema, 0);
queue->size = 0;
}
static int raw_event_queue_add(struct raw_event_queue *queue,
enum usb_raw_event_type type, size_t length, const void *data)
{
unsigned long flags;
struct usb_raw_event *event;
spin_lock_irqsave(&queue->lock, flags);
if (WARN_ON(queue->size >= RAW_EVENT_QUEUE_SIZE)) {
spin_unlock_irqrestore(&queue->lock, flags);
return -ENOMEM;
}
event = kmalloc(sizeof(*event) + length, GFP_ATOMIC);
if (!event) {
spin_unlock_irqrestore(&queue->lock, flags);
return -ENOMEM;
}
event->type = type;
event->length = length;
if (event->length)
memcpy(&event->data[0], data, length);
queue->events[queue->size] = event;
queue->size++;
up(&queue->sema);
spin_unlock_irqrestore(&queue->lock, flags);
return 0;
}
static struct usb_raw_event *raw_event_queue_fetch(
struct raw_event_queue *queue)
{
int ret;
unsigned long flags;
struct usb_raw_event *event;
/*
* This function can be called concurrently. We first check that
* there's at least one event queued by decrementing the semaphore,
* and then take the lock to protect queue struct fields.
*/
ret = down_interruptible(&queue->sema);
if (ret)
return ERR_PTR(ret);
spin_lock_irqsave(&queue->lock, flags);
/*
* queue->size must have the same value as queue->sema counter (before
* the down_interruptible() call above), so this check is a fail-safe.
*/
if (WARN_ON(!queue->size)) {
spin_unlock_irqrestore(&queue->lock, flags);
return ERR_PTR(-ENODEV);
}
event = queue->events[0];
queue->size--;
memmove(&queue->events[0], &queue->events[1],
queue->size * sizeof(queue->events[0]));
spin_unlock_irqrestore(&queue->lock, flags);
return event;
}
static void raw_event_queue_destroy(struct raw_event_queue *queue)
{
int i;
for (i = 0; i < queue->size; i++)
kfree(queue->events[i]);
queue->size = 0;
}
/*----------------------------------------------------------------------*/
struct raw_dev;
#define USB_RAW_MAX_ENDPOINTS 32
enum ep_state {
STATE_EP_DISABLED,
STATE_EP_ENABLED,
};
struct raw_ep {
struct raw_dev *dev;
enum ep_state state;
struct usb_ep *ep;
struct usb_request *req;
bool urb_queued;
bool disabling;
ssize_t status;
};
enum dev_state {
STATE_DEV_INVALID = 0,
STATE_DEV_OPENED,
STATE_DEV_INITIALIZED,
STATE_DEV_RUNNING,
STATE_DEV_CLOSED,
STATE_DEV_FAILED
};
struct raw_dev {
struct kref count;
spinlock_t lock;
const char *udc_name;
struct usb_gadget_driver driver;
/* Reference to misc device: */
struct device *dev;
/* Protected by lock: */
enum dev_state state;
bool gadget_registered;
struct usb_gadget *gadget;
struct usb_request *req;
bool ep0_in_pending;
bool ep0_out_pending;
bool ep0_urb_queued;
ssize_t ep0_status;
struct raw_ep eps[USB_RAW_MAX_ENDPOINTS];
struct completion ep0_done;
struct raw_event_queue queue;
};
static struct raw_dev *dev_new(void)
{
struct raw_dev *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
/* Matches kref_put() in raw_release(). */
kref_init(&dev->count);
spin_lock_init(&dev->lock);
init_completion(&dev->ep0_done);
raw_event_queue_init(&dev->queue);
return dev;
}
static void dev_free(struct kref *kref)
{
struct raw_dev *dev = container_of(kref, struct raw_dev, count);
int i;
kfree(dev->udc_name);
kfree(dev->driver.udc_name);
if (dev->req) {
if (dev->ep0_urb_queued)
usb_ep_dequeue(dev->gadget->ep0, dev->req);
usb_ep_free_request(dev->gadget->ep0, dev->req);
}
raw_event_queue_destroy(&dev->queue);
for (i = 0; i < USB_RAW_MAX_ENDPOINTS; i++) {
if (dev->eps[i].state != STATE_EP_ENABLED)
continue;
usb_ep_disable(dev->eps[i].ep);
usb_ep_free_request(dev->eps[i].ep, dev->eps[i].req);
kfree(dev->eps[i].ep->desc);
dev->eps[i].state = STATE_EP_DISABLED;
}
kfree(dev);
}
/*----------------------------------------------------------------------*/
static int raw_queue_event(struct raw_dev *dev,
enum usb_raw_event_type type, size_t length, const void *data)
{
int ret = 0;
unsigned long flags;
ret = raw_event_queue_add(&dev->queue, type, length, data);
if (ret < 0) {
spin_lock_irqsave(&dev->lock, flags);
dev->state = STATE_DEV_FAILED;
spin_unlock_irqrestore(&dev->lock, flags);
}
return ret;
}
static void gadget_ep0_complete(struct usb_ep *ep, struct usb_request *req)
{
struct raw_dev *dev = req->context;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (req->status)
dev->ep0_status = req->status;
else
dev->ep0_status = req->actual;
if (dev->ep0_in_pending)
dev->ep0_in_pending = false;
else
dev->ep0_out_pending = false;
spin_unlock_irqrestore(&dev->lock, flags);
complete(&dev->ep0_done);
}
static int gadget_bind(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
int ret = 0;
struct raw_dev *dev = container_of(driver, struct raw_dev, driver);
struct usb_request *req;
unsigned long flags;
if (strcmp(gadget->name, dev->udc_name) != 0)
return -ENODEV;
set_gadget_data(gadget, dev);
req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
if (!req) {
dev_err(&gadget->dev, "usb_ep_alloc_request failed\n");
set_gadget_data(gadget, NULL);
return -ENOMEM;
}
spin_lock_irqsave(&dev->lock, flags);
dev->req = req;
dev->req->context = dev;
dev->req->complete = gadget_ep0_complete;
dev->gadget = gadget;
spin_unlock_irqrestore(&dev->lock, flags);
/* Matches kref_put() in gadget_unbind(). */
kref_get(&dev->count);
ret = raw_queue_event(dev, USB_RAW_EVENT_CONNECT, 0, NULL);
if (ret < 0)
dev_err(&gadget->dev, "failed to queue event\n");
return ret;
}
static void gadget_unbind(struct usb_gadget *gadget)
{
struct raw_dev *dev = get_gadget_data(gadget);
set_gadget_data(gadget, NULL);
/* Matches kref_get() in gadget_bind(). */
kref_put(&dev->count, dev_free);
}
static int gadget_setup(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl)
{
int ret = 0;
struct raw_dev *dev = get_gadget_data(gadget);
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_err(&gadget->dev, "ignoring, device is not running\n");
ret = -ENODEV;
goto out_unlock;
}
if (dev->ep0_in_pending || dev->ep0_out_pending) {
dev_dbg(&gadget->dev, "stalling, request already pending\n");
ret = -EBUSY;
goto out_unlock;
}
if ((ctrl->bRequestType & USB_DIR_IN) && ctrl->wLength)
dev->ep0_in_pending = true;
else
dev->ep0_out_pending = true;
spin_unlock_irqrestore(&dev->lock, flags);
ret = raw_queue_event(dev, USB_RAW_EVENT_CONTROL, sizeof(*ctrl), ctrl);
if (ret < 0)
dev_err(&gadget->dev, "failed to queue event\n");
goto out;
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
out:
return ret;
}
/* These are currently unused but present in case UDC driver requires them. */
static void gadget_disconnect(struct usb_gadget *gadget) { }
static void gadget_suspend(struct usb_gadget *gadget) { }
static void gadget_resume(struct usb_gadget *gadget) { }
static void gadget_reset(struct usb_gadget *gadget) { }
/*----------------------------------------------------------------------*/
static struct miscdevice raw_misc_device;
static int raw_open(struct inode *inode, struct file *fd)
{
struct raw_dev *dev;
/* Nonblocking I/O is not supported yet. */
if (fd->f_flags & O_NONBLOCK)
return -EINVAL;
dev = dev_new();
if (!dev)
return -ENOMEM;
fd->private_data = dev;
dev->state = STATE_DEV_OPENED;
dev->dev = raw_misc_device.this_device;
return 0;
}
static int raw_release(struct inode *inode, struct file *fd)
{
int ret = 0;
struct raw_dev *dev = fd->private_data;
unsigned long flags;
bool unregister = false;
spin_lock_irqsave(&dev->lock, flags);
dev->state = STATE_DEV_CLOSED;
if (!dev->gadget) {
spin_unlock_irqrestore(&dev->lock, flags);
goto out_put;
}
if (dev->gadget_registered)
unregister = true;
dev->gadget_registered = false;
spin_unlock_irqrestore(&dev->lock, flags);
if (unregister) {
ret = usb_gadget_unregister_driver(&dev->driver);
if (ret != 0)
dev_err(dev->dev,
"usb_gadget_unregister_driver() failed with %d\n",
ret);
/* Matches kref_get() in raw_ioctl_run(). */
kref_put(&dev->count, dev_free);
}
out_put:
/* Matches dev_new() in raw_open(). */
kref_put(&dev->count, dev_free);
return ret;
}
/*----------------------------------------------------------------------*/
static int raw_ioctl_init(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
struct usb_raw_init arg;
char *udc_driver_name;
char *udc_device_name;
unsigned long flags;
if (copy_from_user(&arg, (void __user *)value, sizeof(arg)))
return -EFAULT;
switch (arg.speed) {
case USB_SPEED_UNKNOWN:
arg.speed = USB_SPEED_HIGH;
break;
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
break;
default:
return -EINVAL;
}
udc_driver_name = kmalloc(UDC_NAME_LENGTH_MAX, GFP_KERNEL);
if (!udc_driver_name)
return -ENOMEM;
ret = strscpy(udc_driver_name, &arg.driver_name[0],
UDC_NAME_LENGTH_MAX);
if (ret < 0) {
kfree(udc_driver_name);
return ret;
}
ret = 0;
udc_device_name = kmalloc(UDC_NAME_LENGTH_MAX, GFP_KERNEL);
if (!udc_device_name) {
kfree(udc_driver_name);
return -ENOMEM;
}
ret = strscpy(udc_device_name, &arg.device_name[0],
UDC_NAME_LENGTH_MAX);
if (ret < 0) {
kfree(udc_driver_name);
kfree(udc_device_name);
return ret;
}
ret = 0;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_OPENED) {
dev_dbg(dev->dev, "fail, device is not opened\n");
kfree(udc_driver_name);
kfree(udc_device_name);
ret = -EINVAL;
goto out_unlock;
}
dev->udc_name = udc_driver_name;
dev->driver.function = DRIVER_DESC;
dev->driver.max_speed = arg.speed;
dev->driver.setup = gadget_setup;
dev->driver.disconnect = gadget_disconnect;
dev->driver.bind = gadget_bind;
dev->driver.unbind = gadget_unbind;
dev->driver.suspend = gadget_suspend;
dev->driver.resume = gadget_resume;
dev->driver.reset = gadget_reset;
dev->driver.driver.name = DRIVER_NAME;
dev->driver.udc_name = udc_device_name;
dev->driver.match_existing_only = 1;
dev->state = STATE_DEV_INITIALIZED;
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_run(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
unsigned long flags;
if (value)
return -EINVAL;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_INITIALIZED) {
dev_dbg(dev->dev, "fail, device is not initialized\n");
ret = -EINVAL;
goto out_unlock;
}
spin_unlock_irqrestore(&dev->lock, flags);
ret = usb_gadget_probe_driver(&dev->driver);
spin_lock_irqsave(&dev->lock, flags);
if (ret) {
dev_err(dev->dev,
"fail, usb_gadget_probe_driver returned %d\n", ret);
dev->state = STATE_DEV_FAILED;
goto out_unlock;
}
dev->gadget_registered = true;
dev->state = STATE_DEV_RUNNING;
/* Matches kref_put() in raw_release(). */
kref_get(&dev->count);
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_event_fetch(struct raw_dev *dev, unsigned long value)
{
struct usb_raw_event arg;
unsigned long flags;
struct usb_raw_event *event;
uint32_t length;
if (copy_from_user(&arg, (void __user *)value, sizeof(arg)))
return -EFAULT;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
spin_unlock_irqrestore(&dev->lock, flags);
return -EINVAL;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
spin_unlock_irqrestore(&dev->lock, flags);
return -EBUSY;
}
spin_unlock_irqrestore(&dev->lock, flags);
event = raw_event_queue_fetch(&dev->queue);
if (PTR_ERR(event) == -EINTR) {
dev_dbg(&dev->gadget->dev, "event fetching interrupted\n");
return -EINTR;
}
if (IS_ERR(event)) {
dev_err(&dev->gadget->dev, "failed to fetch event\n");
spin_lock_irqsave(&dev->lock, flags);
dev->state = STATE_DEV_FAILED;
spin_unlock_irqrestore(&dev->lock, flags);
return -ENODEV;
}
length = min(arg.length, event->length);
if (copy_to_user((void __user *)value, event, sizeof(*event) + length))
return -EFAULT;
return 0;
}
static void *raw_alloc_io_data(struct usb_raw_ep_io *io, void __user *ptr,
bool get_from_user)
{
void *data;
if (copy_from_user(io, ptr, sizeof(*io)))
return ERR_PTR(-EFAULT);
if (io->ep >= USB_RAW_MAX_ENDPOINTS)
return ERR_PTR(-EINVAL);
if (!usb_raw_io_flags_valid(io->flags))
return ERR_PTR(-EINVAL);
if (io->length > PAGE_SIZE)
return ERR_PTR(-EINVAL);
if (get_from_user)
data = memdup_user(ptr + sizeof(*io), io->length);
else {
data = kmalloc(io->length, GFP_KERNEL);
if (!data)
data = ERR_PTR(-ENOMEM);
}
return data;
}
static int raw_process_ep0_io(struct raw_dev *dev, struct usb_raw_ep_io *io,
void *data, bool in)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
if (dev->ep0_urb_queued) {
dev_dbg(&dev->gadget->dev, "fail, urb already queued\n");
ret = -EBUSY;
goto out_unlock;
}
if ((in && !dev->ep0_in_pending) ||
(!in && !dev->ep0_out_pending)) {
dev_dbg(&dev->gadget->dev, "fail, wrong direction\n");
ret = -EBUSY;
goto out_unlock;
}
if (WARN_ON(in && dev->ep0_out_pending)) {
ret = -ENODEV;
dev->state = STATE_DEV_FAILED;
goto out_done;
}
if (WARN_ON(!in && dev->ep0_in_pending)) {
ret = -ENODEV;
dev->state = STATE_DEV_FAILED;
goto out_done;
}
dev->req->buf = data;
dev->req->length = io->length;
dev->req->zero = usb_raw_io_flags_zero(io->flags);
dev->ep0_urb_queued = true;
spin_unlock_irqrestore(&dev->lock, flags);
ret = usb_ep_queue(dev->gadget->ep0, dev->req, GFP_KERNEL);
if (ret) {
dev_err(&dev->gadget->dev,
"fail, usb_ep_queue returned %d\n", ret);
spin_lock_irqsave(&dev->lock, flags);
dev->state = STATE_DEV_FAILED;
goto out_done;
}
ret = wait_for_completion_interruptible(&dev->ep0_done);
if (ret) {
dev_dbg(&dev->gadget->dev, "wait interrupted\n");
usb_ep_dequeue(dev->gadget->ep0, dev->req);
wait_for_completion(&dev->ep0_done);
spin_lock_irqsave(&dev->lock, flags);
goto out_done;
}
spin_lock_irqsave(&dev->lock, flags);
ret = dev->ep0_status;
out_done:
dev->ep0_urb_queued = false;
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_ep0_write(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
void *data;
struct usb_raw_ep_io io;
data = raw_alloc_io_data(&io, (void __user *)value, true);
if (IS_ERR(data))
return PTR_ERR(data);
ret = raw_process_ep0_io(dev, &io, data, true);
kfree(data);
return ret;
}
static int raw_ioctl_ep0_read(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
void *data;
struct usb_raw_ep_io io;
unsigned int length;
data = raw_alloc_io_data(&io, (void __user *)value, false);
if (IS_ERR(data))
return PTR_ERR(data);
ret = raw_process_ep0_io(dev, &io, data, false);
if (ret)
goto free;
length = min(io.length, (unsigned int)ret);
if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
ret = -EFAULT;
free:
kfree(data);
return ret;
}
static bool check_ep_caps(struct usb_ep *ep,
struct usb_endpoint_descriptor *desc)
{
switch (usb_endpoint_type(desc)) {
case USB_ENDPOINT_XFER_ISOC:
if (!ep->caps.type_iso)
return false;
break;
case USB_ENDPOINT_XFER_BULK:
if (!ep->caps.type_bulk)
return false;
break;
case USB_ENDPOINT_XFER_INT:
if (!ep->caps.type_int)
return false;
break;
default:
return false;
}
if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in)
return false;
if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out)
return false;
return true;
}
static int raw_ioctl_ep_enable(struct raw_dev *dev, unsigned long value)
{
int ret = 0, i;
unsigned long flags;
struct usb_endpoint_descriptor *desc;
struct usb_ep *ep = NULL;
desc = memdup_user((void __user *)value, sizeof(*desc));
if (IS_ERR(desc))
return PTR_ERR(desc);
/*
* Endpoints with a maxpacket length of 0 can cause crashes in UDC
* drivers.
*/
if (usb_endpoint_maxp(desc) == 0) {
dev_dbg(dev->dev, "fail, bad endpoint maxpacket\n");
kfree(desc);
return -EINVAL;
}
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_free;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_free;
}
for (i = 0; i < USB_RAW_MAX_ENDPOINTS; i++) {
if (dev->eps[i].state == STATE_EP_ENABLED)
continue;
break;
}
if (i == USB_RAW_MAX_ENDPOINTS) {
dev_dbg(&dev->gadget->dev,
"fail, no device endpoints available\n");
ret = -EBUSY;
goto out_free;
}
gadget_for_each_ep(ep, dev->gadget) {
if (ep->enabled)
continue;
if (!check_ep_caps(ep, desc))
continue;
ep->desc = desc;
ret = usb_ep_enable(ep);
if (ret < 0) {
dev_err(&dev->gadget->dev,
"fail, usb_ep_enable returned %d\n", ret);
goto out_free;
}
dev->eps[i].req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (!dev->eps[i].req) {
dev_err(&dev->gadget->dev,
"fail, usb_ep_alloc_request failed\n");
usb_ep_disable(ep);
ret = -ENOMEM;
goto out_free;
}
dev->eps[i].ep = ep;
dev->eps[i].state = STATE_EP_ENABLED;
ep->driver_data = &dev->eps[i];
ret = i;
goto out_unlock;
}
dev_dbg(&dev->gadget->dev, "fail, no gadget endpoints available\n");
ret = -EBUSY;
out_free:
kfree(desc);
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_ep_disable(struct raw_dev *dev, unsigned long value)
{
int ret = 0, i = value;
unsigned long flags;
const void *desc;
if (i < 0 || i >= USB_RAW_MAX_ENDPOINTS)
return -EINVAL;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
if (dev->eps[i].state != STATE_EP_ENABLED) {
dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
ret = -EINVAL;
goto out_unlock;
}
if (dev->eps[i].disabling) {
dev_dbg(&dev->gadget->dev,
"fail, disable already in progress\n");
ret = -EINVAL;
goto out_unlock;
}
if (dev->eps[i].urb_queued) {
dev_dbg(&dev->gadget->dev,
"fail, waiting for urb completion\n");
ret = -EINVAL;
goto out_unlock;
}
dev->eps[i].disabling = true;
spin_unlock_irqrestore(&dev->lock, flags);
usb_ep_disable(dev->eps[i].ep);
spin_lock_irqsave(&dev->lock, flags);
usb_ep_free_request(dev->eps[i].ep, dev->eps[i].req);
desc = dev->eps[i].ep->desc;
dev->eps[i].ep = NULL;
dev->eps[i].state = STATE_EP_DISABLED;
kfree(desc);
dev->eps[i].disabling = false;
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static void gadget_ep_complete(struct usb_ep *ep, struct usb_request *req)
{
struct raw_ep *r_ep = (struct raw_ep *)ep->driver_data;
struct raw_dev *dev = r_ep->dev;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (req->status)
r_ep->status = req->status;
else
r_ep->status = req->actual;
spin_unlock_irqrestore(&dev->lock, flags);
complete((struct completion *)req->context);
}
static int raw_process_ep_io(struct raw_dev *dev, struct usb_raw_ep_io *io,
void *data, bool in)
{
int ret = 0;
unsigned long flags;
struct raw_ep *ep = &dev->eps[io->ep];
DECLARE_COMPLETION_ONSTACK(done);
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
if (ep->state != STATE_EP_ENABLED) {
dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
ret = -EBUSY;
goto out_unlock;
}
if (ep->disabling) {
dev_dbg(&dev->gadget->dev,
"fail, endpoint is already being disabled\n");
ret = -EBUSY;
goto out_unlock;
}
if (ep->urb_queued) {
dev_dbg(&dev->gadget->dev, "fail, urb already queued\n");
ret = -EBUSY;
goto out_unlock;
}
if ((in && !ep->ep->caps.dir_in) || (!in && ep->ep->caps.dir_in)) {
dev_dbg(&dev->gadget->dev, "fail, wrong direction\n");
ret = -EINVAL;
goto out_unlock;
}
ep->dev = dev;
ep->req->context = &done;
ep->req->complete = gadget_ep_complete;
ep->req->buf = data;
ep->req->length = io->length;
ep->req->zero = usb_raw_io_flags_zero(io->flags);
ep->urb_queued = true;
spin_unlock_irqrestore(&dev->lock, flags);
ret = usb_ep_queue(ep->ep, ep->req, GFP_KERNEL);
if (ret) {
dev_err(&dev->gadget->dev,
"fail, usb_ep_queue returned %d\n", ret);
spin_lock_irqsave(&dev->lock, flags);
dev->state = STATE_DEV_FAILED;
goto out_done;
}
ret = wait_for_completion_interruptible(&done);
if (ret) {
dev_dbg(&dev->gadget->dev, "wait interrupted\n");
usb_ep_dequeue(ep->ep, ep->req);
wait_for_completion(&done);
spin_lock_irqsave(&dev->lock, flags);
goto out_done;
}
spin_lock_irqsave(&dev->lock, flags);
ret = ep->status;
out_done:
ep->urb_queued = false;
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_ep_write(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
char *data;
struct usb_raw_ep_io io;
data = raw_alloc_io_data(&io, (void __user *)value, true);
if (IS_ERR(data))
return PTR_ERR(data);
ret = raw_process_ep_io(dev, &io, data, true);
kfree(data);
return ret;
}
static int raw_ioctl_ep_read(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
char *data;
struct usb_raw_ep_io io;
unsigned int length;
data = raw_alloc_io_data(&io, (void __user *)value, false);
if (IS_ERR(data))
return PTR_ERR(data);
ret = raw_process_ep_io(dev, &io, data, false);
if (ret)
goto free;
length = min(io.length, (unsigned int)ret);
if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
ret = -EFAULT;
free:
kfree(data);
return ret;
}
static int raw_ioctl_configure(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
unsigned long flags;
if (value)
return -EINVAL;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
usb_gadget_set_state(dev->gadget, USB_STATE_CONFIGURED);
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_vbus_draw(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
usb_gadget_vbus_draw(dev->gadget, 2 * value);
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static long raw_ioctl(struct file *fd, unsigned int cmd, unsigned long value)
{
struct raw_dev *dev = fd->private_data;
int ret = 0;
if (!dev)
return -EBUSY;
switch (cmd) {
case USB_RAW_IOCTL_INIT:
ret = raw_ioctl_init(dev, value);
break;
case USB_RAW_IOCTL_RUN:
ret = raw_ioctl_run(dev, value);
break;
case USB_RAW_IOCTL_EVENT_FETCH:
ret = raw_ioctl_event_fetch(dev, value);
break;
case USB_RAW_IOCTL_EP0_WRITE:
ret = raw_ioctl_ep0_write(dev, value);
break;
case USB_RAW_IOCTL_EP0_READ:
ret = raw_ioctl_ep0_read(dev, value);
break;
case USB_RAW_IOCTL_EP_ENABLE:
ret = raw_ioctl_ep_enable(dev, value);
break;
case USB_RAW_IOCTL_EP_DISABLE:
ret = raw_ioctl_ep_disable(dev, value);
break;
case USB_RAW_IOCTL_EP_WRITE:
ret = raw_ioctl_ep_write(dev, value);
break;
case USB_RAW_IOCTL_EP_READ:
ret = raw_ioctl_ep_read(dev, value);
break;
case USB_RAW_IOCTL_CONFIGURE:
ret = raw_ioctl_configure(dev, value);
break;
case USB_RAW_IOCTL_VBUS_DRAW:
ret = raw_ioctl_vbus_draw(dev, value);
break;
default:
ret = -EINVAL;
}
return ret;
}
/*----------------------------------------------------------------------*/
static const struct file_operations raw_fops = {
.open = raw_open,
.unlocked_ioctl = raw_ioctl,
.compat_ioctl = raw_ioctl,
.release = raw_release,
.llseek = no_llseek,
};
static struct miscdevice raw_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = DRIVER_NAME,
.fops = &raw_fops,
};
module_misc_device(raw_misc_device);
|