1/* 2 * adutux - driver for ADU devices from Ontrak Control Systems 3 * This is an experimental driver. Use at your own risk. 4 * This driver is not supported by Ontrak Control Systems. 5 * 6 * Copyright (c) 2003 John Homppi (SCO, leave this notice here) 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * derived from the Lego USB Tower driver 0.56: 14 * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net> 15 * 2001 Juergen Stuber <stuber@loria.fr> 16 * that was derived from USB Skeleton driver - 0.5 17 * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com) 18 * 19 */ 20 21#include <linux/kernel.h> 22#include <linux/errno.h> 23#include <linux/init.h> 24#include <linux/slab.h> 25#include <linux/module.h> 26#include <linux/usb.h> 27#include <linux/mutex.h> 28#include <asm/uaccess.h> 29 30#ifdef CONFIG_USB_DEBUG 31static int debug = 5; 32#else 33static int debug = 1; 34#endif 35 36/* Use our own dbg macro */ 37#undef dbg 38#define dbg(lvl, format, arg...) \ 39do { \ 40 if (debug >= lvl) \ 41 printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \ 42} while (0) 43 44 45/* Version Information */ 46#define DRIVER_VERSION "v0.0.13" 47#define DRIVER_AUTHOR "John Homppi" 48#define DRIVER_DESC "adutux (see www.ontrak.net)" 49 50/* Module parameters */ 51module_param(debug, int, S_IRUGO | S_IWUSR); 52MODULE_PARM_DESC(debug, "Debug enabled or not"); 53 54/* Define these values to match your device */ 55#define ADU_VENDOR_ID 0x0a07 56#define ADU_PRODUCT_ID 0x0064 57 58/* table of devices that work with this driver */ 59static const struct usb_device_id device_table[] = { 60 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ 61 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ 62 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ 63 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ 64 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ 65 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ 66 { }/* Terminating entry */ 67}; 68 69MODULE_DEVICE_TABLE(usb, device_table); 70 71#ifdef CONFIG_USB_DYNAMIC_MINORS 72#define ADU_MINOR_BASE 0 73#else 74#define ADU_MINOR_BASE 67 75#endif 76 77/* we can have up to this number of device plugged in at once */ 78#define MAX_DEVICES 16 79 80#define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */ 81 82/* 83 * The locking scheme is a vanilla 3-lock: 84 * adu_device.buflock: A spinlock, covers what IRQs touch. 85 * adutux_mutex: A Static lock to cover open_count. It would also cover 86 * any globals, but we don't have them in 2.6. 87 * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. 88 * It covers all of adu_device, except the open_count 89 * and what .buflock covers. 90 */ 91 92/* Structure to hold all of our device specific stuff */ 93struct adu_device { 94 struct mutex mtx; 95 struct usb_device* udev; /* save off the usb device pointer */ 96 struct usb_interface* interface; 97 unsigned int minor; /* the starting minor number for this device */ 98 char serial_number[8]; 99 100 int open_count; /* number of times this port has been opened */ 101 102 char* read_buffer_primary; 103 int read_buffer_length; 104 char* read_buffer_secondary; 105 int secondary_head; 106 int secondary_tail; 107 spinlock_t buflock; 108 109 wait_queue_head_t read_wait; 110 wait_queue_head_t write_wait; 111 112 char* interrupt_in_buffer; 113 struct usb_endpoint_descriptor* interrupt_in_endpoint; 114 struct urb* interrupt_in_urb; 115 int read_urb_finished; 116 117 char* interrupt_out_buffer; 118 struct usb_endpoint_descriptor* interrupt_out_endpoint; 119 struct urb* interrupt_out_urb; 120 int out_urb_finished; 121}; 122 123static DEFINE_MUTEX(adutux_mutex); 124 125static struct usb_driver adu_driver; 126 127static void adu_debug_data(int level, const char *function, int size, 128 const unsigned char *data) 129{ 130 int i; 131 132 if (debug < level) 133 return; 134 135 printk(KERN_DEBUG "%s: %s - length = %d, data = ", 136 __FILE__, function, size); 137 for (i = 0; i < size; ++i) 138 printk("%.2x ", data[i]); 139 printk("\n"); 140} 141 142/** 143 * adu_abort_transfers 144 * aborts transfers and frees associated data structures 145 */ 146static void adu_abort_transfers(struct adu_device *dev) 147{ 148 unsigned long flags; 149 150 dbg(2," %s : enter", __func__); 151 152 if (dev->udev == NULL) { 153 dbg(1," %s : udev is null", __func__); 154 goto exit; 155 } 156 157 /* shutdown transfer */ 158 159 spin_lock_irqsave(&dev->buflock, flags); 160 if (!dev->read_urb_finished) { 161 spin_unlock_irqrestore(&dev->buflock, flags); 162 usb_kill_urb(dev->interrupt_in_urb); 163 } else 164 spin_unlock_irqrestore(&dev->buflock, flags); 165 166 spin_lock_irqsave(&dev->buflock, flags); 167 if (!dev->out_urb_finished) { 168 spin_unlock_irqrestore(&dev->buflock, flags); 169 usb_kill_urb(dev->interrupt_out_urb); 170 } else 171 spin_unlock_irqrestore(&dev->buflock, flags); 172 173exit: 174 dbg(2," %s : leave", __func__); 175} 176 177static void adu_delete(struct adu_device *dev) 178{ 179 dbg(2, "%s enter", __func__); 180 181 /* free data structures */ 182 usb_free_urb(dev->interrupt_in_urb); 183 usb_free_urb(dev->interrupt_out_urb); 184 kfree(dev->read_buffer_primary); 185 kfree(dev->read_buffer_secondary); 186 kfree(dev->interrupt_in_buffer); 187 kfree(dev->interrupt_out_buffer); 188 kfree(dev); 189 190 dbg(2, "%s : leave", __func__); 191} 192 193static void adu_interrupt_in_callback(struct urb *urb) 194{ 195 struct adu_device *dev = urb->context; 196 int status = urb->status; 197 198 dbg(4," %s : enter, status %d", __func__, status); 199 adu_debug_data(5, __func__, urb->actual_length, 200 urb->transfer_buffer); 201 202 spin_lock(&dev->buflock); 203 204 if (status != 0) { 205 if ((status != -ENOENT) && (status != -ECONNRESET) && 206 (status != -ESHUTDOWN)) { 207 dbg(1," %s : nonzero status received: %d", 208 __func__, status); 209 } 210 goto exit; 211 } 212 213 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { 214 if (dev->read_buffer_length < 215 (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) - 216 (urb->actual_length)) { 217 memcpy (dev->read_buffer_primary + 218 dev->read_buffer_length, 219 dev->interrupt_in_buffer, urb->actual_length); 220 221 dev->read_buffer_length += urb->actual_length; 222 dbg(2," %s reading %d ", __func__, 223 urb->actual_length); 224 } else { 225 dbg(1," %s : read_buffer overflow", __func__); 226 } 227 } 228 229exit: 230 dev->read_urb_finished = 1; 231 spin_unlock(&dev->buflock); 232 /* always wake up so we recover from errors */ 233 wake_up_interruptible(&dev->read_wait); 234 adu_debug_data(5, __func__, urb->actual_length, 235 urb->transfer_buffer); 236 dbg(4," %s : leave, status %d", __func__, status); 237} 238 239static void adu_interrupt_out_callback(struct urb *urb) 240{ 241 struct adu_device *dev = urb->context; 242 int status = urb->status; 243 244 dbg(4," %s : enter, status %d", __func__, status); 245 adu_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer); 246 247 if (status != 0) { 248 if ((status != -ENOENT) && 249 (status != -ECONNRESET)) { 250 dbg(1, " %s :nonzero status received: %d", 251 __func__, status); 252 } 253 goto exit; 254 } 255 256 spin_lock(&dev->buflock); 257 dev->out_urb_finished = 1; 258 wake_up(&dev->write_wait); 259 spin_unlock(&dev->buflock); 260exit: 261 262 adu_debug_data(5, __func__, urb->actual_length, 263 urb->transfer_buffer); 264 dbg(4," %s : leave, status %d", __func__, status); 265} 266 267static int adu_open(struct inode *inode, struct file *file) 268{ 269 struct adu_device *dev = NULL; 270 struct usb_interface *interface; 271 int subminor; 272 int retval; 273 274 dbg(2,"%s : enter", __func__); 275 276 subminor = iminor(inode); 277 278 if ((retval = mutex_lock_interruptible(&adutux_mutex))) { 279 dbg(2, "%s : mutex lock failed", __func__); 280 goto exit_no_lock; 281 } 282 283 interface = usb_find_interface(&adu_driver, subminor); 284 if (!interface) { 285 printk(KERN_ERR "adutux: %s - error, can't find device for " 286 "minor %d\n", __func__, subminor); 287 retval = -ENODEV; 288 goto exit_no_device; 289 } 290 291 dev = usb_get_intfdata(interface); 292 if (!dev || !dev->udev) { 293 retval = -ENODEV; 294 goto exit_no_device; 295 } 296 297 /* check that nobody else is using the device */ 298 if (dev->open_count) { 299 retval = -EBUSY; 300 goto exit_no_device; 301 } 302 303 ++dev->open_count; 304 dbg(2,"%s : open count %d", __func__, dev->open_count); 305 306 /* save device in the file's private structure */ 307 file->private_data = dev; 308 309 /* initialize in direction */ 310 dev->read_buffer_length = 0; 311 312 /* fixup first read by having urb waiting for it */ 313 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, 314 usb_rcvintpipe(dev->udev, 315 dev->interrupt_in_endpoint->bEndpointAddress), 316 dev->interrupt_in_buffer, 317 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 318 adu_interrupt_in_callback, dev, 319 dev->interrupt_in_endpoint->bInterval); 320 dev->read_urb_finished = 0; 321 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) 322 dev->read_urb_finished = 1; 323 /* we ignore failure */ 324 /* end of fixup for first read */ 325 326 /* initialize out direction */ 327 dev->out_urb_finished = 1; 328 329 retval = 0; 330 331exit_no_device: 332 mutex_unlock(&adutux_mutex); 333exit_no_lock: 334 dbg(2,"%s : leave, return value %d ", __func__, retval); 335 return retval; 336} 337 338static void adu_release_internal(struct adu_device *dev) 339{ 340 dbg(2," %s : enter", __func__); 341 342 /* decrement our usage count for the device */ 343 --dev->open_count; 344 dbg(2," %s : open count %d", __func__, dev->open_count); 345 if (dev->open_count <= 0) { 346 adu_abort_transfers(dev); 347 dev->open_count = 0; 348 } 349 350 dbg(2," %s : leave", __func__); 351} 352 353static int adu_release(struct inode *inode, struct file *file) 354{ 355 struct adu_device *dev; 356 int retval = 0; 357 358 dbg(2," %s : enter", __func__); 359 360 if (file == NULL) { 361 dbg(1," %s : file is NULL", __func__); 362 retval = -ENODEV; 363 goto exit; 364 } 365 366 dev = file->private_data; 367 if (dev == NULL) { 368 dbg(1," %s : object is NULL", __func__); 369 retval = -ENODEV; 370 goto exit; 371 } 372 373 mutex_lock(&adutux_mutex); /* not interruptible */ 374 375 if (dev->open_count <= 0) { 376 dbg(1," %s : device not opened", __func__); 377 retval = -ENODEV; 378 goto unlock; 379 } 380 381 adu_release_internal(dev); 382 if (dev->udev == NULL) { 383 /* the device was unplugged before the file was released */ 384 if (!dev->open_count) /* ... and we're the last user */ 385 adu_delete(dev); 386 } 387unlock: 388 mutex_unlock(&adutux_mutex); 389exit: 390 dbg(2," %s : leave, return value %d", __func__, retval); 391 return retval; 392} 393 394static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, 395 loff_t *ppos) 396{ 397 struct adu_device *dev; 398 size_t bytes_read = 0; 399 size_t bytes_to_read = count; 400 int i; 401 int retval = 0; 402 int timeout = 0; 403 int should_submit = 0; 404 unsigned long flags; 405 DECLARE_WAITQUEUE(wait, current); 406 407 dbg(2," %s : enter, count = %Zd, file=%p", __func__, count, file); 408 409 dev = file->private_data; 410 dbg(2," %s : dev=%p", __func__, dev); 411 412 if (mutex_lock_interruptible(&dev->mtx)) 413 return -ERESTARTSYS; 414 415 /* verify that the device wasn't unplugged */ 416 if (dev->udev == NULL) { 417 retval = -ENODEV; 418 printk(KERN_ERR "adutux: No device or device unplugged %d\n", 419 retval); 420 goto exit; 421 } 422 423 /* verify that some data was requested */ 424 if (count == 0) { 425 dbg(1," %s : read request of 0 bytes", __func__); 426 goto exit; 427 } 428 429 timeout = COMMAND_TIMEOUT; 430 dbg(2," %s : about to start looping", __func__); 431 while (bytes_to_read) { 432 int data_in_secondary = dev->secondary_tail - dev->secondary_head; 433 dbg(2," %s : while, data_in_secondary=%d, status=%d", 434 __func__, data_in_secondary, 435 dev->interrupt_in_urb->status); 436 437 if (data_in_secondary) { 438 /* drain secondary buffer */ 439 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary; 440 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount); 441 if (i) { 442 retval = -EFAULT; 443 goto exit; 444 } 445 dev->secondary_head += (amount - i); 446 bytes_read += (amount - i); 447 bytes_to_read -= (amount - i); 448 if (i) { 449 retval = bytes_read ? bytes_read : -EFAULT; 450 goto exit; 451 } 452 } else { 453 /* we check the primary buffer */ 454 spin_lock_irqsave (&dev->buflock, flags); 455 if (dev->read_buffer_length) { 456 /* we secure access to the primary */ 457 char *tmp; 458 dbg(2," %s : swap, read_buffer_length = %d", 459 __func__, dev->read_buffer_length); 460 tmp = dev->read_buffer_secondary; 461 dev->read_buffer_secondary = dev->read_buffer_primary; 462 dev->read_buffer_primary = tmp; 463 dev->secondary_head = 0; 464 dev->secondary_tail = dev->read_buffer_length; 465 dev->read_buffer_length = 0; 466 spin_unlock_irqrestore(&dev->buflock, flags); 467 /* we have a free buffer so use it */ 468 should_submit = 1; 469 } else { 470 /* even the primary was empty - we may need to do IO */ 471 if (!dev->read_urb_finished) { 472 /* somebody is doing IO */ 473 spin_unlock_irqrestore(&dev->buflock, flags); 474 dbg(2," %s : submitted already", __func__); 475 } else { 476 /* we must initiate input */ 477 dbg(2," %s : initiate input", __func__); 478 dev->read_urb_finished = 0; 479 spin_unlock_irqrestore(&dev->buflock, flags); 480 481 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, 482 usb_rcvintpipe(dev->udev, 483 dev->interrupt_in_endpoint->bEndpointAddress), 484 dev->interrupt_in_buffer, 485 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 486 adu_interrupt_in_callback, 487 dev, 488 dev->interrupt_in_endpoint->bInterval); 489 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 490 if (retval) { 491 dev->read_urb_finished = 1; 492 if (retval == -ENOMEM) { 493 retval = bytes_read ? bytes_read : -ENOMEM; 494 } 495 dbg(2," %s : submit failed", __func__); 496 goto exit; 497 } 498 } 499 500 /* we wait for I/O to complete */ 501 set_current_state(TASK_INTERRUPTIBLE); 502 add_wait_queue(&dev->read_wait, &wait); 503 spin_lock_irqsave(&dev->buflock, flags); 504 if (!dev->read_urb_finished) { 505 spin_unlock_irqrestore(&dev->buflock, flags); 506 timeout = schedule_timeout(COMMAND_TIMEOUT); 507 } else { 508 spin_unlock_irqrestore(&dev->buflock, flags); 509 set_current_state(TASK_RUNNING); 510 } 511 remove_wait_queue(&dev->read_wait, &wait); 512 513 if (timeout <= 0) { 514 dbg(2," %s : timeout", __func__); 515 retval = bytes_read ? bytes_read : -ETIMEDOUT; 516 goto exit; 517 } 518 519 if (signal_pending(current)) { 520 dbg(2," %s : signal pending", __func__); 521 retval = bytes_read ? bytes_read : -EINTR; 522 goto exit; 523 } 524 } 525 } 526 } 527 528 retval = bytes_read; 529 /* if the primary buffer is empty then use it */ 530 spin_lock_irqsave(&dev->buflock, flags); 531 if (should_submit && dev->read_urb_finished) { 532 dev->read_urb_finished = 0; 533 spin_unlock_irqrestore(&dev->buflock, flags); 534 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, 535 usb_rcvintpipe(dev->udev, 536 dev->interrupt_in_endpoint->bEndpointAddress), 537 dev->interrupt_in_buffer, 538 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 539 adu_interrupt_in_callback, 540 dev, 541 dev->interrupt_in_endpoint->bInterval); 542 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) 543 dev->read_urb_finished = 1; 544 /* we ignore failure */ 545 } else { 546 spin_unlock_irqrestore(&dev->buflock, flags); 547 } 548 549exit: 550 /* unlock the device */ 551 mutex_unlock(&dev->mtx); 552 553 dbg(2," %s : leave, return value %d", __func__, retval); 554 return retval; 555} 556 557static ssize_t adu_write(struct file *file, const __user char *buffer, 558 size_t count, loff_t *ppos) 559{ 560 DECLARE_WAITQUEUE(waita, current); 561 struct adu_device *dev; 562 size_t bytes_written = 0; 563 size_t bytes_to_write; 564 size_t buffer_size; 565 unsigned long flags; 566 int retval; 567 568 dbg(2," %s : enter, count = %Zd", __func__, count); 569 570 dev = file->private_data; 571 572 retval = mutex_lock_interruptible(&dev->mtx); 573 if (retval) 574 goto exit_nolock; 575 576 /* verify that the device wasn't unplugged */ 577 if (dev->udev == NULL) { 578 retval = -ENODEV; 579 printk(KERN_ERR "adutux: No device or device unplugged %d\n", 580 retval); 581 goto exit; 582 } 583 584 /* verify that we actually have some data to write */ 585 if (count == 0) { 586 dbg(1," %s : write request of 0 bytes", __func__); 587 goto exit; 588 } 589 590 while (count > 0) { 591 add_wait_queue(&dev->write_wait, &waita); 592 set_current_state(TASK_INTERRUPTIBLE); 593 spin_lock_irqsave(&dev->buflock, flags); 594 if (!dev->out_urb_finished) { 595 spin_unlock_irqrestore(&dev->buflock, flags); 596 597 mutex_unlock(&dev->mtx); 598 if (signal_pending(current)) { 599 dbg(1," %s : interrupted", __func__); 600 set_current_state(TASK_RUNNING); 601 retval = -EINTR; 602 goto exit_onqueue; 603 } 604 if (schedule_timeout(COMMAND_TIMEOUT) == 0) { 605 dbg(1, "%s - command timed out.", __func__); 606 retval = -ETIMEDOUT; 607 goto exit_onqueue; 608 } 609 remove_wait_queue(&dev->write_wait, &waita); 610 retval = mutex_lock_interruptible(&dev->mtx); 611 if (retval) { 612 retval = bytes_written ? bytes_written : retval; 613 goto exit_nolock; 614 } 615 616 dbg(4," %s : in progress, count = %Zd", __func__, count); 617 } else { 618 spin_unlock_irqrestore(&dev->buflock, flags); 619 set_current_state(TASK_RUNNING); 620 remove_wait_queue(&dev->write_wait, &waita); 621 dbg(4," %s : sending, count = %Zd", __func__, count); 622 623 /* write the data into interrupt_out_buffer from userspace */ 624 buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); 625 bytes_to_write = count > buffer_size ? buffer_size : count; 626 dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd", 627 __func__, buffer_size, count, bytes_to_write); 628 629 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { 630 retval = -EFAULT; 631 goto exit; 632 } 633 634 /* send off the urb */ 635 usb_fill_int_urb( 636 dev->interrupt_out_urb, 637 dev->udev, 638 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 639 dev->interrupt_out_buffer, 640 bytes_to_write, 641 adu_interrupt_out_callback, 642 dev, 643 dev->interrupt_out_endpoint->bInterval); 644 dev->interrupt_out_urb->actual_length = bytes_to_write; 645 dev->out_urb_finished = 0; 646 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 647 if (retval < 0) { 648 dev->out_urb_finished = 1; 649 dev_err(&dev->udev->dev, "Couldn't submit " 650 "interrupt_out_urb %d\n", retval); 651 goto exit; 652 } 653 654 buffer += bytes_to_write; 655 count -= bytes_to_write; 656 657 bytes_written += bytes_to_write; 658 } 659 } 660 mutex_unlock(&dev->mtx); 661 return bytes_written; 662 663exit: 664 mutex_unlock(&dev->mtx); 665exit_nolock: 666 dbg(2," %s : leave, return value %d", __func__, retval); 667 return retval; 668 669exit_onqueue: 670 remove_wait_queue(&dev->write_wait, &waita); 671 return retval; 672} 673 674/* file operations needed when we register this driver */ 675static const struct file_operations adu_fops = { 676 .owner = THIS_MODULE, 677 .read = adu_read, 678 .write = adu_write, 679 .open = adu_open, 680 .release = adu_release, 681}; 682 683/* 684 * usb class driver info in order to get a minor number from the usb core, 685 * and to have the device registered with devfs and the driver core 686 */ 687static struct usb_class_driver adu_class = { 688 .name = "usb/adutux%d", 689 .fops = &adu_fops, 690 .minor_base = ADU_MINOR_BASE, 691}; 692 693/** 694 * adu_probe 695 * 696 * Called by the usb core when a new device is connected that it thinks 697 * this driver might be interested in. 698 */ 699static int adu_probe(struct usb_interface *interface, 700 const struct usb_device_id *id) 701{ 702 struct usb_device *udev = interface_to_usbdev(interface); 703 struct adu_device *dev = NULL; 704 struct usb_host_interface *iface_desc; 705 struct usb_endpoint_descriptor *endpoint; 706 int retval = -ENODEV; 707 int in_end_size; 708 int out_end_size; 709 int i; 710 711 dbg(2," %s : enter", __func__); 712 713 if (udev == NULL) { 714 dev_err(&interface->dev, "udev is NULL.\n"); 715 goto exit; 716 } 717 718 /* allocate memory for our device state and intialize it */ 719 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); 720 if (dev == NULL) { 721 dev_err(&interface->dev, "Out of memory\n"); 722 retval = -ENOMEM; 723 goto exit; 724 } 725 726 mutex_init(&dev->mtx); 727 spin_lock_init(&dev->buflock); 728 dev->udev = udev; 729 init_waitqueue_head(&dev->read_wait); 730 init_waitqueue_head(&dev->write_wait); 731 732 iface_desc = &interface->altsetting[0]; 733 734 /* set up the endpoint information */ 735 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 736 endpoint = &iface_desc->endpoint[i].desc; 737 738 if (usb_endpoint_is_int_in(endpoint)) 739 dev->interrupt_in_endpoint = endpoint; 740 741 if (usb_endpoint_is_int_out(endpoint)) 742 dev->interrupt_out_endpoint = endpoint; 743 } 744 if (dev->interrupt_in_endpoint == NULL) { 745 dev_err(&interface->dev, "interrupt in endpoint not found\n"); 746 goto error; 747 } 748 if (dev->interrupt_out_endpoint == NULL) { 749 dev_err(&interface->dev, "interrupt out endpoint not found\n"); 750 goto error; 751 } 752 753 in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); 754 out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); 755 756 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); 757 if (!dev->read_buffer_primary) { 758 dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n"); 759 retval = -ENOMEM; 760 goto error; 761 } 762 763 /* debug code prime the buffer */ 764 memset(dev->read_buffer_primary, 'a', in_end_size); 765 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); 766 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); 767 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); 768 769 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); 770 if (!dev->read_buffer_secondary) { 771 dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n"); 772 retval = -ENOMEM; 773 goto error; 774 } 775 776 /* debug code prime the buffer */ 777 memset(dev->read_buffer_secondary, 'e', in_end_size); 778 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); 779 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); 780 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); 781 782 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); 783 if (!dev->interrupt_in_buffer) { 784 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n"); 785 goto error; 786 } 787 788 /* debug code prime the buffer */ 789 memset(dev->interrupt_in_buffer, 'i', in_end_size); 790 791 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 792 if (!dev->interrupt_in_urb) { 793 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); 794 goto error; 795 } 796 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); 797 if (!dev->interrupt_out_buffer) { 798 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n"); 799 goto error; 800 } 801 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 802 if (!dev->interrupt_out_urb) { 803 dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n"); 804 goto error; 805 } 806 807 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, 808 sizeof(dev->serial_number))) { 809 dev_err(&interface->dev, "Could not retrieve serial number\n"); 810 goto error; 811 } 812 dbg(2," %s : serial_number=%s", __func__, dev->serial_number); 813 814 /* we can register the device now, as it is ready */ 815 usb_set_intfdata(interface, dev); 816 817 retval = usb_register_dev(interface, &adu_class); 818 819 if (retval) { 820 /* something prevented us from registering this driver */ 821 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 822 usb_set_intfdata(interface, NULL); 823 goto error; 824 } 825 826 dev->minor = interface->minor; 827 828 /* let the user know what node this device is now attached to */ 829 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", 830 udev->descriptor.idProduct, dev->serial_number, 831 (dev->minor - ADU_MINOR_BASE)); 832exit: 833 dbg(2," %s : leave, return value %p (dev)", __func__, dev); 834 835 return retval; 836 837error: 838 adu_delete(dev); 839 return retval; 840} 841 842/** 843 * adu_disconnect 844 * 845 * Called by the usb core when the device is removed from the system. 846 */ 847static void adu_disconnect(struct usb_interface *interface) 848{ 849 struct adu_device *dev; 850 int minor; 851 852 dbg(2," %s : enter", __func__); 853 854 dev = usb_get_intfdata(interface); 855 856 mutex_lock(&dev->mtx); /* not interruptible */ 857 dev->udev = NULL; /* poison */ 858 minor = dev->minor; 859 usb_deregister_dev(interface, &adu_class); 860 mutex_unlock(&dev->mtx); 861 862 mutex_lock(&adutux_mutex); 863 usb_set_intfdata(interface, NULL); 864 865 /* if the device is not opened, then we clean up right now */ 866 dbg(2," %s : open count %d", __func__, dev->open_count); 867 if (!dev->open_count) 868 adu_delete(dev); 869 870 mutex_unlock(&adutux_mutex); 871 872 dev_info(&interface->dev, "ADU device adutux%d now disconnected\n", 873 (minor - ADU_MINOR_BASE)); 874 875 dbg(2," %s : leave", __func__); 876} 877 878/* usb specific object needed to register this driver with the usb subsystem */ 879static struct usb_driver adu_driver = { 880 .name = "adutux", 881 .probe = adu_probe, 882 .disconnect = adu_disconnect, 883 .id_table = device_table, 884}; 885 886static int __init adu_init(void) 887{ 888 int result; 889 890 dbg(2," %s : enter", __func__); 891 892 /* register this driver with the USB subsystem */ 893 result = usb_register(&adu_driver); 894 if (result < 0) { 895 printk(KERN_ERR "usb_register failed for the "__FILE__ 896 " driver. Error number %d\n", result); 897 goto exit; 898 } 899 900 printk(KERN_INFO "adutux " DRIVER_DESC " " DRIVER_VERSION "\n"); 901 printk(KERN_INFO "adutux is an experimental driver. " 902 "Use at your own risk\n"); 903 904exit: 905 dbg(2," %s : leave, return value %d", __func__, result); 906 907 return result; 908} 909 910static void __exit adu_exit(void) 911{ 912 dbg(2," %s : enter", __func__); 913 /* deregister this driver with the USB subsystem */ 914 usb_deregister(&adu_driver); 915 dbg(2," %s : leave", __func__); 916} 917 918module_init(adu_init); 919module_exit(adu_exit); 920 921MODULE_AUTHOR(DRIVER_AUTHOR); 922MODULE_DESCRIPTION(DRIVER_DESC); 923MODULE_LICENSE("GPL"); 924