1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * adutux - driver for ADU devices from Ontrak Control Systems 4 * This is an experimental driver. Use at your own risk. 5 * This driver is not supported by Ontrak Control Systems. 6 * 7 * Copyright (c) 2003 John Homppi (SCO, leave this notice here) 8 * 9 * derived from the Lego USB Tower driver 0.56: 10 * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net> 11 * 2001 Juergen Stuber <stuber@loria.fr> 12 * that was derived from USB Skeleton driver - 0.5 13 * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com) 14 * 15 */ 16 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 18 19 #include <linux/kernel.h> 20 #include <linux/sched/signal.h> 21 #include <linux/errno.h> 22 #include <linux/slab.h> 23 #include <linux/module.h> 24 #include <linux/usb.h> 25 #include <linux/mutex.h> 26 #include <linux/uaccess.h> 27 28 #define DRIVER_AUTHOR "John Homppi" 29 #define DRIVER_DESC "adutux (see www.ontrak.net)" 30 31 /* Define these values to match your device */ 32 #define ADU_VENDOR_ID 0x0a07 33 #define ADU_PRODUCT_ID 0x0064 34 35 /* table of devices that work with this driver */ 36 static const struct usb_device_id device_table[] = { 37 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ 38 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ 39 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ 40 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ 41 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ 42 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ 43 { } /* Terminating entry */ 44 }; 45 46 MODULE_DEVICE_TABLE(usb, device_table); 47 48 #ifdef CONFIG_USB_DYNAMIC_MINORS 49 #define ADU_MINOR_BASE 0 50 #else 51 #define ADU_MINOR_BASE 67 52 #endif 53 54 /* we can have up to this number of device plugged in at once */ 55 #define MAX_DEVICES 16 56 57 #define COMMAND_TIMEOUT (2*HZ) 58 59 /* 60 * The locking scheme is a vanilla 3-lock: 61 * adu_device.buflock: A spinlock, covers what IRQs touch. 62 * adutux_mutex: A Static lock to cover open_count. It would also cover 63 * any globals, but we don't have them in 2.6. 64 * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. 65 * It covers all of adu_device, except the open_count 66 * and what .buflock covers. 67 */ 68 69 /* Structure to hold all of our device specific stuff */ 70 struct adu_device { 71 struct mutex mtx; 72 struct usb_device *udev; /* save off the usb device pointer */ 73 struct usb_interface *interface; 74 unsigned int minor; /* the starting minor number for this device */ 75 char serial_number[8]; 76 77 int open_count; /* number of times this port has been opened */ 78 unsigned long disconnected:1; 79 80 char *read_buffer_primary; 81 int read_buffer_length; 82 char *read_buffer_secondary; 83 int secondary_head; 84 int secondary_tail; 85 spinlock_t buflock; 86 87 wait_queue_head_t read_wait; 88 wait_queue_head_t write_wait; 89 90 char *interrupt_in_buffer; 91 struct usb_endpoint_descriptor *interrupt_in_endpoint; 92 struct urb *interrupt_in_urb; 93 int read_urb_finished; 94 95 char *interrupt_out_buffer; 96 struct usb_endpoint_descriptor *interrupt_out_endpoint; 97 struct urb *interrupt_out_urb; 98 int out_urb_finished; 99 }; 100 101 static DEFINE_MUTEX(adutux_mutex); 102 103 static struct usb_driver adu_driver; 104 105 static inline void adu_debug_data(struct device *dev, const char *function, 106 int size, const unsigned char *data) 107 { 108 dev_dbg(dev, "%s - length = %d, data = %*ph\n", 109 function, size, size, data); 110 } 111 112 /* 113 * adu_abort_transfers 114 * aborts transfers and frees associated data structures 115 */ 116 static void adu_abort_transfers(struct adu_device *dev) 117 { 118 unsigned long flags; 119 120 if (dev->disconnected) 121 return; 122 123 /* shutdown transfer */ 124 125 /* XXX Anchor these instead */ 126 spin_lock_irqsave(&dev->buflock, flags); 127 if (!dev->read_urb_finished) { 128 spin_unlock_irqrestore(&dev->buflock, flags); 129 usb_kill_urb(dev->interrupt_in_urb); 130 } else 131 spin_unlock_irqrestore(&dev->buflock, flags); 132 133 spin_lock_irqsave(&dev->buflock, flags); 134 if (!dev->out_urb_finished) { 135 spin_unlock_irqrestore(&dev->buflock, flags); 136 wait_event_timeout(dev->write_wait, dev->out_urb_finished, 137 COMMAND_TIMEOUT); 138 usb_kill_urb(dev->interrupt_out_urb); 139 } else 140 spin_unlock_irqrestore(&dev->buflock, flags); 141 } 142 143 static void adu_delete(struct adu_device *dev) 144 { 145 /* free data structures */ 146 usb_free_urb(dev->interrupt_in_urb); 147 usb_free_urb(dev->interrupt_out_urb); 148 kfree(dev->read_buffer_primary); 149 kfree(dev->read_buffer_secondary); 150 kfree(dev->interrupt_in_buffer); 151 kfree(dev->interrupt_out_buffer); 152 usb_put_dev(dev->udev); 153 kfree(dev); 154 } 155 156 static void adu_interrupt_in_callback(struct urb *urb) 157 { 158 struct adu_device *dev = urb->context; 159 int status = urb->status; 160 unsigned long flags; 161 162 adu_debug_data(&dev->udev->dev, __func__, 163 urb->actual_length, urb->transfer_buffer); 164 165 spin_lock_irqsave(&dev->buflock, flags); 166 167 if (status != 0) { 168 if ((status != -ENOENT) && (status != -ECONNRESET) && 169 (status != -ESHUTDOWN)) { 170 dev_dbg(&dev->udev->dev, 171 "%s : nonzero status received: %d\n", 172 __func__, status); 173 } 174 goto exit; 175 } 176 177 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { 178 if (dev->read_buffer_length < 179 (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) - 180 (urb->actual_length)) { 181 memcpy (dev->read_buffer_primary + 182 dev->read_buffer_length, 183 dev->interrupt_in_buffer, urb->actual_length); 184 185 dev->read_buffer_length += urb->actual_length; 186 dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__, 187 urb->actual_length); 188 } else { 189 dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n", 190 __func__); 191 } 192 } 193 194 exit: 195 dev->read_urb_finished = 1; 196 spin_unlock_irqrestore(&dev->buflock, flags); 197 /* always wake up so we recover from errors */ 198 wake_up_interruptible(&dev->read_wait); 199 } 200 201 static void adu_interrupt_out_callback(struct urb *urb) 202 { 203 struct adu_device *dev = urb->context; 204 int status = urb->status; 205 unsigned long flags; 206 207 adu_debug_data(&dev->udev->dev, __func__, 208 urb->actual_length, urb->transfer_buffer); 209 210 if (status != 0) { 211 if ((status != -ENOENT) && 212 (status != -ECONNRESET)) { 213 dev_dbg(&dev->udev->dev, 214 "%s :nonzero status received: %d\n", __func__, 215 status); 216 } 217 return; 218 } 219 220 spin_lock_irqsave(&dev->buflock, flags); 221 dev->out_urb_finished = 1; 222 wake_up(&dev->write_wait); 223 spin_unlock_irqrestore(&dev->buflock, flags); 224 } 225 226 static int adu_open(struct inode *inode, struct file *file) 227 { 228 struct adu_device *dev = NULL; 229 struct usb_interface *interface; 230 int subminor; 231 int retval; 232 233 subminor = iminor(inode); 234 235 retval = mutex_lock_interruptible(&adutux_mutex); 236 if (retval) 237 goto exit_no_lock; 238 239 interface = usb_find_interface(&adu_driver, subminor); 240 if (!interface) { 241 pr_err("%s - error, can't find device for minor %d\n", 242 __func__, subminor); 243 retval = -ENODEV; 244 goto exit_no_device; 245 } 246 247 dev = usb_get_intfdata(interface); 248 if (!dev) { 249 retval = -ENODEV; 250 goto exit_no_device; 251 } 252 253 /* check that nobody else is using the device */ 254 if (dev->open_count) { 255 retval = -EBUSY; 256 goto exit_no_device; 257 } 258 259 ++dev->open_count; 260 dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__, 261 dev->open_count); 262 263 /* save device in the file's private structure */ 264 file->private_data = dev; 265 266 /* initialize in direction */ 267 dev->read_buffer_length = 0; 268 269 /* fixup first read by having urb waiting for it */ 270 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, 271 usb_rcvintpipe(dev->udev, 272 dev->interrupt_in_endpoint->bEndpointAddress), 273 dev->interrupt_in_buffer, 274 usb_endpoint_maxp(dev->interrupt_in_endpoint), 275 adu_interrupt_in_callback, dev, 276 dev->interrupt_in_endpoint->bInterval); 277 dev->read_urb_finished = 0; 278 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) 279 dev->read_urb_finished = 1; 280 /* we ignore failure */ 281 /* end of fixup for first read */ 282 283 /* initialize out direction */ 284 dev->out_urb_finished = 1; 285 286 retval = 0; 287 288 exit_no_device: 289 mutex_unlock(&adutux_mutex); 290 exit_no_lock: 291 return retval; 292 } 293 294 static void adu_release_internal(struct adu_device *dev) 295 { 296 /* decrement our usage count for the device */ 297 --dev->open_count; 298 dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__, 299 dev->open_count); 300 if (dev->open_count <= 0) { 301 adu_abort_transfers(dev); 302 dev->open_count = 0; 303 } 304 } 305 306 static int adu_release(struct inode *inode, struct file *file) 307 { 308 struct adu_device *dev; 309 int retval = 0; 310 311 if (file == NULL) { 312 retval = -ENODEV; 313 goto exit; 314 } 315 316 dev = file->private_data; 317 if (dev == NULL) { 318 retval = -ENODEV; 319 goto exit; 320 } 321 322 mutex_lock(&adutux_mutex); /* not interruptible */ 323 324 if (dev->open_count <= 0) { 325 dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__); 326 retval = -ENODEV; 327 goto unlock; 328 } 329 330 adu_release_internal(dev); 331 if (dev->disconnected) { 332 /* the device was unplugged before the file was released */ 333 if (!dev->open_count) /* ... and we're the last user */ 334 adu_delete(dev); 335 } 336 unlock: 337 mutex_unlock(&adutux_mutex); 338 exit: 339 return retval; 340 } 341 342 static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, 343 loff_t *ppos) 344 { 345 struct adu_device *dev; 346 size_t bytes_read = 0; 347 size_t bytes_to_read = count; 348 int retval = 0; 349 int timeout = 0; 350 int should_submit = 0; 351 unsigned long flags; 352 DECLARE_WAITQUEUE(wait, current); 353 354 dev = file->private_data; 355 if (mutex_lock_interruptible(&dev->mtx)) 356 return -ERESTARTSYS; 357 358 /* verify that the device wasn't unplugged */ 359 if (dev->disconnected) { 360 retval = -ENODEV; 361 pr_err("No device or device unplugged %d\n", retval); 362 goto exit; 363 } 364 365 /* verify that some data was requested */ 366 if (count == 0) { 367 dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n", 368 __func__); 369 goto exit; 370 } 371 372 timeout = COMMAND_TIMEOUT; 373 dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__); 374 while (bytes_to_read) { 375 size_t data_in_secondary = dev->secondary_tail - dev->secondary_head; 376 dev_dbg(&dev->udev->dev, 377 "%s : while, data_in_secondary=%zu, status=%d\n", 378 __func__, data_in_secondary, 379 dev->interrupt_in_urb->status); 380 381 if (data_in_secondary) { 382 /* drain secondary buffer */ 383 size_t amount = min(bytes_to_read, data_in_secondary); 384 if (copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount)) { 385 retval = -EFAULT; 386 goto exit; 387 } 388 dev->secondary_head += amount; 389 bytes_read += amount; 390 bytes_to_read -= amount; 391 } else { 392 /* we check the primary buffer */ 393 spin_lock_irqsave (&dev->buflock, flags); 394 if (dev->read_buffer_length) { 395 /* we secure access to the primary */ 396 char *tmp; 397 dev_dbg(&dev->udev->dev, 398 "%s : swap, read_buffer_length = %d\n", 399 __func__, dev->read_buffer_length); 400 tmp = dev->read_buffer_secondary; 401 dev->read_buffer_secondary = dev->read_buffer_primary; 402 dev->read_buffer_primary = tmp; 403 dev->secondary_head = 0; 404 dev->secondary_tail = dev->read_buffer_length; 405 dev->read_buffer_length = 0; 406 spin_unlock_irqrestore(&dev->buflock, flags); 407 /* we have a free buffer so use it */ 408 should_submit = 1; 409 } else { 410 /* even the primary was empty - we may need to do IO */ 411 if (!dev->read_urb_finished) { 412 /* somebody is doing IO */ 413 spin_unlock_irqrestore(&dev->buflock, flags); 414 dev_dbg(&dev->udev->dev, 415 "%s : submitted already\n", 416 __func__); 417 } else { 418 /* we must initiate input */ 419 dev_dbg(&dev->udev->dev, 420 "%s : initiate input\n", 421 __func__); 422 dev->read_urb_finished = 0; 423 spin_unlock_irqrestore(&dev->buflock, flags); 424 425 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, 426 usb_rcvintpipe(dev->udev, 427 dev->interrupt_in_endpoint->bEndpointAddress), 428 dev->interrupt_in_buffer, 429 usb_endpoint_maxp(dev->interrupt_in_endpoint), 430 adu_interrupt_in_callback, 431 dev, 432 dev->interrupt_in_endpoint->bInterval); 433 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 434 if (retval) { 435 dev->read_urb_finished = 1; 436 if (retval == -ENOMEM) { 437 retval = bytes_read ? bytes_read : -ENOMEM; 438 } 439 dev_dbg(&dev->udev->dev, 440 "%s : submit failed\n", 441 __func__); 442 goto exit; 443 } 444 } 445 446 /* we wait for I/O to complete */ 447 set_current_state(TASK_INTERRUPTIBLE); 448 add_wait_queue(&dev->read_wait, &wait); 449 spin_lock_irqsave(&dev->buflock, flags); 450 if (!dev->read_urb_finished) { 451 spin_unlock_irqrestore(&dev->buflock, flags); 452 timeout = schedule_timeout(COMMAND_TIMEOUT); 453 } else { 454 spin_unlock_irqrestore(&dev->buflock, flags); 455 set_current_state(TASK_RUNNING); 456 } 457 remove_wait_queue(&dev->read_wait, &wait); 458 459 if (timeout <= 0) { 460 dev_dbg(&dev->udev->dev, 461 "%s : timeout\n", __func__); 462 retval = bytes_read ? bytes_read : -ETIMEDOUT; 463 goto exit; 464 } 465 466 if (signal_pending(current)) { 467 dev_dbg(&dev->udev->dev, 468 "%s : signal pending\n", 469 __func__); 470 retval = bytes_read ? bytes_read : -EINTR; 471 goto exit; 472 } 473 } 474 } 475 } 476 477 retval = bytes_read; 478 /* if the primary buffer is empty then use it */ 479 spin_lock_irqsave(&dev->buflock, flags); 480 if (should_submit && dev->read_urb_finished) { 481 dev->read_urb_finished = 0; 482 spin_unlock_irqrestore(&dev->buflock, flags); 483 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, 484 usb_rcvintpipe(dev->udev, 485 dev->interrupt_in_endpoint->bEndpointAddress), 486 dev->interrupt_in_buffer, 487 usb_endpoint_maxp(dev->interrupt_in_endpoint), 488 adu_interrupt_in_callback, 489 dev, 490 dev->interrupt_in_endpoint->bInterval); 491 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) 492 dev->read_urb_finished = 1; 493 /* we ignore failure */ 494 } else { 495 spin_unlock_irqrestore(&dev->buflock, flags); 496 } 497 498 exit: 499 /* unlock the device */ 500 mutex_unlock(&dev->mtx); 501 502 return retval; 503 } 504 505 static ssize_t adu_write(struct file *file, const __user char *buffer, 506 size_t count, loff_t *ppos) 507 { 508 DECLARE_WAITQUEUE(waita, current); 509 struct adu_device *dev; 510 size_t bytes_written = 0; 511 size_t bytes_to_write; 512 size_t buffer_size; 513 unsigned long flags; 514 int retval; 515 516 dev = file->private_data; 517 518 retval = mutex_lock_interruptible(&dev->mtx); 519 if (retval) 520 goto exit_nolock; 521 522 /* verify that the device wasn't unplugged */ 523 if (dev->disconnected) { 524 retval = -ENODEV; 525 pr_err("No device or device unplugged %d\n", retval); 526 goto exit; 527 } 528 529 /* verify that we actually have some data to write */ 530 if (count == 0) { 531 dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n", 532 __func__); 533 goto exit; 534 } 535 536 while (count > 0) { 537 add_wait_queue(&dev->write_wait, &waita); 538 set_current_state(TASK_INTERRUPTIBLE); 539 spin_lock_irqsave(&dev->buflock, flags); 540 if (!dev->out_urb_finished) { 541 spin_unlock_irqrestore(&dev->buflock, flags); 542 543 mutex_unlock(&dev->mtx); 544 if (signal_pending(current)) { 545 dev_dbg(&dev->udev->dev, "%s : interrupted\n", 546 __func__); 547 set_current_state(TASK_RUNNING); 548 retval = -EINTR; 549 goto exit_onqueue; 550 } 551 if (schedule_timeout(COMMAND_TIMEOUT) == 0) { 552 dev_dbg(&dev->udev->dev, 553 "%s - command timed out.\n", __func__); 554 retval = -ETIMEDOUT; 555 goto exit_onqueue; 556 } 557 remove_wait_queue(&dev->write_wait, &waita); 558 retval = mutex_lock_interruptible(&dev->mtx); 559 if (retval) { 560 retval = bytes_written ? bytes_written : retval; 561 goto exit_nolock; 562 } 563 564 dev_dbg(&dev->udev->dev, 565 "%s : in progress, count = %zd\n", 566 __func__, count); 567 } else { 568 spin_unlock_irqrestore(&dev->buflock, flags); 569 set_current_state(TASK_RUNNING); 570 remove_wait_queue(&dev->write_wait, &waita); 571 dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n", 572 __func__, count); 573 574 /* write the data into interrupt_out_buffer from userspace */ 575 buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); 576 bytes_to_write = count > buffer_size ? buffer_size : count; 577 dev_dbg(&dev->udev->dev, 578 "%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n", 579 __func__, buffer_size, count, bytes_to_write); 580 581 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { 582 retval = -EFAULT; 583 goto exit; 584 } 585 586 /* send off the urb */ 587 usb_fill_int_urb( 588 dev->interrupt_out_urb, 589 dev->udev, 590 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 591 dev->interrupt_out_buffer, 592 bytes_to_write, 593 adu_interrupt_out_callback, 594 dev, 595 dev->interrupt_out_endpoint->bInterval); 596 dev->interrupt_out_urb->actual_length = bytes_to_write; 597 dev->out_urb_finished = 0; 598 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 599 if (retval < 0) { 600 dev->out_urb_finished = 1; 601 dev_err(&dev->udev->dev, "Couldn't submit " 602 "interrupt_out_urb %d\n", retval); 603 goto exit; 604 } 605 606 buffer += bytes_to_write; 607 count -= bytes_to_write; 608 609 bytes_written += bytes_to_write; 610 } 611 } 612 mutex_unlock(&dev->mtx); 613 return bytes_written; 614 615 exit: 616 mutex_unlock(&dev->mtx); 617 exit_nolock: 618 return retval; 619 620 exit_onqueue: 621 remove_wait_queue(&dev->write_wait, &waita); 622 return retval; 623 } 624 625 /* file operations needed when we register this driver */ 626 static const struct file_operations adu_fops = { 627 .owner = THIS_MODULE, 628 .read = adu_read, 629 .write = adu_write, 630 .open = adu_open, 631 .release = adu_release, 632 .llseek = noop_llseek, 633 }; 634 635 /* 636 * usb class driver info in order to get a minor number from the usb core, 637 * and to have the device registered with devfs and the driver core 638 */ 639 static struct usb_class_driver adu_class = { 640 .name = "usb/adutux%d", 641 .fops = &adu_fops, 642 .minor_base = ADU_MINOR_BASE, 643 }; 644 645 /* 646 * adu_probe 647 * 648 * Called by the usb core when a new device is connected that it thinks 649 * this driver might be interested in. 650 */ 651 static int adu_probe(struct usb_interface *interface, 652 const struct usb_device_id *id) 653 { 654 struct usb_device *udev = interface_to_usbdev(interface); 655 struct adu_device *dev = NULL; 656 int retval = -ENOMEM; 657 int in_end_size; 658 int out_end_size; 659 int res; 660 661 /* allocate memory for our device state and initialize it */ 662 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); 663 if (!dev) 664 return -ENOMEM; 665 666 mutex_init(&dev->mtx); 667 spin_lock_init(&dev->buflock); 668 dev->udev = usb_get_dev(udev); 669 init_waitqueue_head(&dev->read_wait); 670 init_waitqueue_head(&dev->write_wait); 671 672 res = usb_find_common_endpoints_reverse(interface->cur_altsetting, 673 NULL, NULL, 674 &dev->interrupt_in_endpoint, 675 &dev->interrupt_out_endpoint); 676 if (res) { 677 dev_err(&interface->dev, "interrupt endpoints not found\n"); 678 retval = res; 679 goto error; 680 } 681 682 in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); 683 out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); 684 685 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); 686 if (!dev->read_buffer_primary) 687 goto error; 688 689 /* debug code prime the buffer */ 690 memset(dev->read_buffer_primary, 'a', in_end_size); 691 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); 692 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); 693 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); 694 695 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); 696 if (!dev->read_buffer_secondary) 697 goto error; 698 699 /* debug code prime the buffer */ 700 memset(dev->read_buffer_secondary, 'e', in_end_size); 701 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); 702 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); 703 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); 704 705 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); 706 if (!dev->interrupt_in_buffer) 707 goto error; 708 709 /* debug code prime the buffer */ 710 memset(dev->interrupt_in_buffer, 'i', in_end_size); 711 712 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 713 if (!dev->interrupt_in_urb) 714 goto error; 715 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); 716 if (!dev->interrupt_out_buffer) 717 goto error; 718 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 719 if (!dev->interrupt_out_urb) 720 goto error; 721 722 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, 723 sizeof(dev->serial_number))) { 724 dev_err(&interface->dev, "Could not retrieve serial number\n"); 725 retval = -EIO; 726 goto error; 727 } 728 dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number); 729 730 /* we can register the device now, as it is ready */ 731 usb_set_intfdata(interface, dev); 732 733 retval = usb_register_dev(interface, &adu_class); 734 735 if (retval) { 736 /* something prevented us from registering this driver */ 737 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 738 usb_set_intfdata(interface, NULL); 739 goto error; 740 } 741 742 dev->minor = interface->minor; 743 744 /* let the user know what node this device is now attached to */ 745 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", 746 le16_to_cpu(udev->descriptor.idProduct), dev->serial_number, 747 (dev->minor - ADU_MINOR_BASE)); 748 749 return 0; 750 751 error: 752 adu_delete(dev); 753 return retval; 754 } 755 756 /* 757 * adu_disconnect 758 * 759 * Called by the usb core when the device is removed from the system. 760 */ 761 static void adu_disconnect(struct usb_interface *interface) 762 { 763 struct adu_device *dev; 764 765 dev = usb_get_intfdata(interface); 766 767 usb_deregister_dev(interface, &adu_class); 768 769 usb_poison_urb(dev->interrupt_in_urb); 770 usb_poison_urb(dev->interrupt_out_urb); 771 772 mutex_lock(&adutux_mutex); 773 usb_set_intfdata(interface, NULL); 774 775 mutex_lock(&dev->mtx); /* not interruptible */ 776 dev->disconnected = 1; 777 mutex_unlock(&dev->mtx); 778 779 /* if the device is not opened, then we clean up right now */ 780 if (!dev->open_count) 781 adu_delete(dev); 782 783 mutex_unlock(&adutux_mutex); 784 } 785 786 /* usb specific object needed to register this driver with the usb subsystem */ 787 static struct usb_driver adu_driver = { 788 .name = "adutux", 789 .probe = adu_probe, 790 .disconnect = adu_disconnect, 791 .id_table = device_table, 792 }; 793 794 module_usb_driver(adu_driver); 795 796 MODULE_AUTHOR(DRIVER_AUTHOR); 797 MODULE_DESCRIPTION(DRIVER_DESC); 798 MODULE_LICENSE("GPL"); 799