adutux.c revision 86266452f80545285c14e20a8024f79c4fb88a86
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 <linux/smp_lock.h> 29#include <asm/uaccess.h> 30 31#ifdef CONFIG_USB_DEBUG 32static int debug = 5; 33#else 34static int debug = 1; 35#endif 36 37/* Use our own dbg macro */ 38#undef dbg 39#define dbg(lvl, format, arg...) \ 40do { \ 41 if (debug >= lvl) \ 42 printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg); \ 43} while (0) 44 45 46/* Version Information */ 47#define DRIVER_VERSION "v0.0.13" 48#define DRIVER_AUTHOR "John Homppi" 49#define DRIVER_DESC "adutux (see www.ontrak.net)" 50 51/* Module parameters */ 52module_param(debug, int, S_IRUGO | S_IWUSR); 53MODULE_PARM_DESC(debug, "Debug enabled or not"); 54 55/* Define these values to match your device */ 56#define ADU_VENDOR_ID 0x0a07 57#define ADU_PRODUCT_ID 0x0064 58 59/* table of devices that work with this driver */ 60static const struct usb_device_id device_table[] = { 61 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ 62 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ 63 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ 64 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ 65 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ 66 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ 67 { }/* Terminating entry */ 68}; 69 70MODULE_DEVICE_TABLE(usb, device_table); 71 72#ifdef CONFIG_USB_DYNAMIC_MINORS 73#define ADU_MINOR_BASE 0 74#else 75#define ADU_MINOR_BASE 67 76#endif 77 78/* we can have up to this number of device plugged in at once */ 79#define MAX_DEVICES 16 80 81#define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */ 82 83/* 84 * The locking scheme is a vanilla 3-lock: 85 * adu_device.buflock: A spinlock, covers what IRQs touch. 86 * adutux_mutex: A Static lock to cover open_count. It would also cover 87 * any globals, but we don't have them in 2.6. 88 * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. 89 * It covers all of adu_device, except the open_count 90 * and what .buflock covers. 91 */ 92 93/* Structure to hold all of our device specific stuff */ 94struct adu_device { 95 struct mutex mtx; 96 struct usb_device* udev; /* save off the usb device pointer */ 97 struct usb_interface* interface; 98 unsigned int minor; /* the starting minor number for this device */ 99 char serial_number[8]; 100 101 int open_count; /* number of times this port has been opened */ 102 103 char* read_buffer_primary; 104 int read_buffer_length; 105 char* read_buffer_secondary; 106 int secondary_head; 107 int secondary_tail; 108 spinlock_t buflock; 109 110 wait_queue_head_t read_wait; 111 wait_queue_head_t write_wait; 112 113 char* interrupt_in_buffer; 114 struct usb_endpoint_descriptor* interrupt_in_endpoint; 115 struct urb* interrupt_in_urb; 116 int read_urb_finished; 117 118 char* interrupt_out_buffer; 119 struct usb_endpoint_descriptor* interrupt_out_endpoint; 120 struct urb* interrupt_out_urb; 121 int out_urb_finished; 122}; 123 124static DEFINE_MUTEX(adutux_mutex); 125 126static struct usb_driver adu_driver; 127 128static void adu_debug_data(int level, const char *function, int size, 129 const unsigned char *data) 130{ 131 int i; 132 133 if (debug < level) 134 return; 135 136 printk(KERN_DEBUG __FILE__": %s - length = %d, data = ", 137 function, size); 138 for (i = 0; i < size; ++i) 139 printk("%.2x ", data[i]); 140 printk("\n"); 141} 142 143/** 144 * adu_abort_transfers 145 * aborts transfers and frees associated data structures 146 */ 147static void adu_abort_transfers(struct adu_device *dev) 148{ 149 unsigned long flags; 150 151 dbg(2," %s : enter", __func__); 152 153 if (dev->udev == NULL) { 154 dbg(1," %s : udev is null", __func__); 155 goto exit; 156 } 157 158 /* shutdown transfer */ 159 160 /* XXX Anchor these instead */ 161 spin_lock_irqsave(&dev->buflock, flags); 162 if (!dev->read_urb_finished) { 163 spin_unlock_irqrestore(&dev->buflock, flags); 164 usb_kill_urb(dev->interrupt_in_urb); 165 } else 166 spin_unlock_irqrestore(&dev->buflock, flags); 167 168 spin_lock_irqsave(&dev->buflock, flags); 169 if (!dev->out_urb_finished) { 170 spin_unlock_irqrestore(&dev->buflock, flags); 171 usb_kill_urb(dev->interrupt_out_urb); 172 } else 173 spin_unlock_irqrestore(&dev->buflock, flags); 174 175exit: 176 dbg(2," %s : leave", __func__); 177} 178 179static void adu_delete(struct adu_device *dev) 180{ 181 dbg(2, "%s enter", __func__); 182 183 /* free data structures */ 184 usb_free_urb(dev->interrupt_in_urb); 185 usb_free_urb(dev->interrupt_out_urb); 186 kfree(dev->read_buffer_primary); 187 kfree(dev->read_buffer_secondary); 188 kfree(dev->interrupt_in_buffer); 189 kfree(dev->interrupt_out_buffer); 190 kfree(dev); 191 192 dbg(2, "%s : leave", __func__); 193} 194 195static void adu_interrupt_in_callback(struct urb *urb) 196{ 197 struct adu_device *dev = urb->context; 198 int status = urb->status; 199 200 dbg(4," %s : enter, status %d", __func__, status); 201 adu_debug_data(5, __func__, urb->actual_length, 202 urb->transfer_buffer); 203 204 spin_lock(&dev->buflock); 205 206 if (status != 0) { 207 if ((status != -ENOENT) && (status != -ECONNRESET) && 208 (status != -ESHUTDOWN)) { 209 dbg(1," %s : nonzero status received: %d", 210 __func__, status); 211 } 212 goto exit; 213 } 214 215 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { 216 if (dev->read_buffer_length < 217 (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) - 218 (urb->actual_length)) { 219 memcpy (dev->read_buffer_primary + 220 dev->read_buffer_length, 221 dev->interrupt_in_buffer, urb->actual_length); 222 223 dev->read_buffer_length += urb->actual_length; 224 dbg(2," %s reading %d ", __func__, 225 urb->actual_length); 226 } else { 227 dbg(1," %s : read_buffer overflow", __func__); 228 } 229 } 230 231exit: 232 dev->read_urb_finished = 1; 233 spin_unlock(&dev->buflock); 234 /* always wake up so we recover from errors */ 235 wake_up_interruptible(&dev->read_wait); 236 adu_debug_data(5, __func__, urb->actual_length, 237 urb->transfer_buffer); 238 dbg(4," %s : leave, status %d", __func__, status); 239} 240 241static void adu_interrupt_out_callback(struct urb *urb) 242{ 243 struct adu_device *dev = urb->context; 244 int status = urb->status; 245 246 dbg(4," %s : enter, status %d", __func__, status); 247 adu_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer); 248 249 if (status != 0) { 250 if ((status != -ENOENT) && 251 (status != -ECONNRESET)) { 252 dbg(1, " %s :nonzero status received: %d", 253 __func__, status); 254 } 255 goto exit; 256 } 257 258 spin_lock(&dev->buflock); 259 dev->out_urb_finished = 1; 260 wake_up(&dev->write_wait); 261 spin_unlock(&dev->buflock); 262exit: 263 264 adu_debug_data(5, __func__, urb->actual_length, 265 urb->transfer_buffer); 266 dbg(4," %s : leave, status %d", __func__, status); 267} 268 269static int adu_open(struct inode *inode, struct file *file) 270{ 271 struct adu_device *dev = NULL; 272 struct usb_interface *interface; 273 int subminor; 274 int retval; 275 276 dbg(2,"%s : enter", __func__); 277 278 lock_kernel(); 279 subminor = iminor(inode); 280 281 if ((retval = mutex_lock_interruptible(&adutux_mutex))) { 282 dbg(2, "%s : mutex lock failed", __func__); 283 goto exit_no_lock; 284 } 285 286 interface = usb_find_interface(&adu_driver, subminor); 287 if (!interface) { 288 printk(KERN_ERR "adutux: %s - error, can't find device for " 289 "minor %d\n", __func__, subminor); 290 retval = -ENODEV; 291 goto exit_no_device; 292 } 293 294 dev = usb_get_intfdata(interface); 295 if (!dev || !dev->udev) { 296 retval = -ENODEV; 297 goto exit_no_device; 298 } 299 300 /* check that nobody else is using the device */ 301 if (dev->open_count) { 302 retval = -EBUSY; 303 goto exit_no_device; 304 } 305 306 ++dev->open_count; 307 dbg(2,"%s : open count %d", __func__, dev->open_count); 308 309 /* save device in the file's private structure */ 310 file->private_data = dev; 311 312 /* initialize in direction */ 313 dev->read_buffer_length = 0; 314 315 /* fixup first read by having urb waiting for it */ 316 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, 317 usb_rcvintpipe(dev->udev, 318 dev->interrupt_in_endpoint->bEndpointAddress), 319 dev->interrupt_in_buffer, 320 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 321 adu_interrupt_in_callback, dev, 322 dev->interrupt_in_endpoint->bInterval); 323 dev->read_urb_finished = 0; 324 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) 325 dev->read_urb_finished = 1; 326 /* we ignore failure */ 327 /* end of fixup for first read */ 328 329 /* initialize out direction */ 330 dev->out_urb_finished = 1; 331 332 retval = 0; 333 334exit_no_device: 335 mutex_unlock(&adutux_mutex); 336exit_no_lock: 337 unlock_kernel(); 338 dbg(2,"%s : leave, return value %d ", __func__, retval); 339 return retval; 340} 341 342static void adu_release_internal(struct adu_device *dev) 343{ 344 dbg(2," %s : enter", __func__); 345 346 /* decrement our usage count for the device */ 347 --dev->open_count; 348 dbg(2," %s : open count %d", __func__, dev->open_count); 349 if (dev->open_count <= 0) { 350 adu_abort_transfers(dev); 351 dev->open_count = 0; 352 } 353 354 dbg(2," %s : leave", __func__); 355} 356 357static int adu_release(struct inode *inode, struct file *file) 358{ 359 struct adu_device *dev; 360 int retval = 0; 361 362 dbg(2," %s : enter", __func__); 363 364 if (file == NULL) { 365 dbg(1," %s : file is NULL", __func__); 366 retval = -ENODEV; 367 goto exit; 368 } 369 370 dev = file->private_data; 371 if (dev == NULL) { 372 dbg(1," %s : object is NULL", __func__); 373 retval = -ENODEV; 374 goto exit; 375 } 376 377 mutex_lock(&adutux_mutex); /* not interruptible */ 378 379 if (dev->open_count <= 0) { 380 dbg(1," %s : device not opened", __func__); 381 retval = -ENODEV; 382 goto unlock; 383 } 384 385 adu_release_internal(dev); 386 if (dev->udev == NULL) { 387 /* the device was unplugged before the file was released */ 388 if (!dev->open_count) /* ... and we're the last user */ 389 adu_delete(dev); 390 } 391unlock: 392 mutex_unlock(&adutux_mutex); 393exit: 394 dbg(2," %s : leave, return value %d", __func__, retval); 395 return retval; 396} 397 398static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, 399 loff_t *ppos) 400{ 401 struct adu_device *dev; 402 size_t bytes_read = 0; 403 size_t bytes_to_read = count; 404 int i; 405 int retval = 0; 406 int timeout = 0; 407 int should_submit = 0; 408 unsigned long flags; 409 DECLARE_WAITQUEUE(wait, current); 410 411 dbg(2," %s : enter, count = %Zd, file=%p", __func__, count, file); 412 413 dev = file->private_data; 414 dbg(2," %s : dev=%p", __func__, dev); 415 416 if (mutex_lock_interruptible(&dev->mtx)) 417 return -ERESTARTSYS; 418 419 /* verify that the device wasn't unplugged */ 420 if (dev->udev == NULL) { 421 retval = -ENODEV; 422 printk(KERN_ERR "adutux: No device or device unplugged %d\n", 423 retval); 424 goto exit; 425 } 426 427 /* verify that some data was requested */ 428 if (count == 0) { 429 dbg(1," %s : read request of 0 bytes", __func__); 430 goto exit; 431 } 432 433 timeout = COMMAND_TIMEOUT; 434 dbg(2," %s : about to start looping", __func__); 435 while (bytes_to_read) { 436 int data_in_secondary = dev->secondary_tail - dev->secondary_head; 437 dbg(2," %s : while, data_in_secondary=%d, status=%d", 438 __func__, data_in_secondary, 439 dev->interrupt_in_urb->status); 440 441 if (data_in_secondary) { 442 /* drain secondary buffer */ 443 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary; 444 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount); 445 if (i < 0) { 446 retval = -EFAULT; 447 goto exit; 448 } 449 dev->secondary_head += (amount - i); 450 bytes_read += (amount - i); 451 bytes_to_read -= (amount - i); 452 if (i) { 453 retval = bytes_read ? bytes_read : -EFAULT; 454 goto exit; 455 } 456 } else { 457 /* we check the primary buffer */ 458 spin_lock_irqsave (&dev->buflock, flags); 459 if (dev->read_buffer_length) { 460 /* we secure access to the primary */ 461 char *tmp; 462 dbg(2," %s : swap, read_buffer_length = %d", 463 __func__, dev->read_buffer_length); 464 tmp = dev->read_buffer_secondary; 465 dev->read_buffer_secondary = dev->read_buffer_primary; 466 dev->read_buffer_primary = tmp; 467 dev->secondary_head = 0; 468 dev->secondary_tail = dev->read_buffer_length; 469 dev->read_buffer_length = 0; 470 spin_unlock_irqrestore(&dev->buflock, flags); 471 /* we have a free buffer so use it */ 472 should_submit = 1; 473 } else { 474 /* even the primary was empty - we may need to do IO */ 475 if (!dev->read_urb_finished) { 476 /* somebody is doing IO */ 477 spin_unlock_irqrestore(&dev->buflock, flags); 478 dbg(2," %s : submitted already", __func__); 479 } else { 480 /* we must initiate input */ 481 dbg(2," %s : initiate input", __func__); 482 dev->read_urb_finished = 0; 483 spin_unlock_irqrestore(&dev->buflock, flags); 484 485 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, 486 usb_rcvintpipe(dev->udev, 487 dev->interrupt_in_endpoint->bEndpointAddress), 488 dev->interrupt_in_buffer, 489 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 490 adu_interrupt_in_callback, 491 dev, 492 dev->interrupt_in_endpoint->bInterval); 493 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 494 if (retval) { 495 dev->read_urb_finished = 1; 496 if (retval == -ENOMEM) { 497 retval = bytes_read ? bytes_read : -ENOMEM; 498 } 499 dbg(2," %s : submit failed", __func__); 500 goto exit; 501 } 502 } 503 504 /* we wait for I/O to complete */ 505 set_current_state(TASK_INTERRUPTIBLE); 506 add_wait_queue(&dev->read_wait, &wait); 507 spin_lock_irqsave(&dev->buflock, flags); 508 if (!dev->read_urb_finished) { 509 spin_unlock_irqrestore(&dev->buflock, flags); 510 timeout = schedule_timeout(COMMAND_TIMEOUT); 511 } else { 512 spin_unlock_irqrestore(&dev->buflock, flags); 513 set_current_state(TASK_RUNNING); 514 } 515 remove_wait_queue(&dev->read_wait, &wait); 516 517 if (timeout <= 0) { 518 dbg(2," %s : timeout", __func__); 519 retval = bytes_read ? bytes_read : -ETIMEDOUT; 520 goto exit; 521 } 522 523 if (signal_pending(current)) { 524 dbg(2," %s : signal pending", __func__); 525 retval = bytes_read ? bytes_read : -EINTR; 526 goto exit; 527 } 528 } 529 } 530 } 531 532 retval = bytes_read; 533 /* if the primary buffer is empty then use it */ 534 spin_lock_irqsave(&dev->buflock, flags); 535 if (should_submit && dev->read_urb_finished) { 536 dev->read_urb_finished = 0; 537 spin_unlock_irqrestore(&dev->buflock, flags); 538 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, 539 usb_rcvintpipe(dev->udev, 540 dev->interrupt_in_endpoint->bEndpointAddress), 541 dev->interrupt_in_buffer, 542 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 543 adu_interrupt_in_callback, 544 dev, 545 dev->interrupt_in_endpoint->bInterval); 546 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) 547 dev->read_urb_finished = 1; 548 /* we ignore failure */ 549 } else { 550 spin_unlock_irqrestore(&dev->buflock, flags); 551 } 552 553exit: 554 /* unlock the device */ 555 mutex_unlock(&dev->mtx); 556 557 dbg(2," %s : leave, return value %d", __func__, retval); 558 return retval; 559} 560 561static ssize_t adu_write(struct file *file, const __user char *buffer, 562 size_t count, loff_t *ppos) 563{ 564 DECLARE_WAITQUEUE(waita, current); 565 struct adu_device *dev; 566 size_t bytes_written = 0; 567 size_t bytes_to_write; 568 size_t buffer_size; 569 unsigned long flags; 570 int retval; 571 572 dbg(2," %s : enter, count = %Zd", __func__, count); 573 574 dev = file->private_data; 575 576 retval = mutex_lock_interruptible(&dev->mtx); 577 if (retval) 578 goto exit_nolock; 579 580 /* verify that the device wasn't unplugged */ 581 if (dev->udev == NULL) { 582 retval = -ENODEV; 583 printk(KERN_ERR "adutux: No device or device unplugged %d\n", 584 retval); 585 goto exit; 586 } 587 588 /* verify that we actually have some data to write */ 589 if (count == 0) { 590 dbg(1," %s : write request of 0 bytes", __func__); 591 goto exit; 592 } 593 594 while (count > 0) { 595 add_wait_queue(&dev->write_wait, &waita); 596 set_current_state(TASK_INTERRUPTIBLE); 597 spin_lock_irqsave(&dev->buflock, flags); 598 if (!dev->out_urb_finished) { 599 spin_unlock_irqrestore(&dev->buflock, flags); 600 601 mutex_unlock(&dev->mtx); 602 if (signal_pending(current)) { 603 dbg(1," %s : interrupted", __func__); 604 set_current_state(TASK_RUNNING); 605 retval = -EINTR; 606 goto exit_onqueue; 607 } 608 if (schedule_timeout(COMMAND_TIMEOUT) == 0) { 609 dbg(1, "%s - command timed out.", __func__); 610 retval = -ETIMEDOUT; 611 goto exit_onqueue; 612 } 613 remove_wait_queue(&dev->write_wait, &waita); 614 retval = mutex_lock_interruptible(&dev->mtx); 615 if (retval) { 616 retval = bytes_written ? bytes_written : retval; 617 goto exit_nolock; 618 } 619 620 dbg(4," %s : in progress, count = %Zd", __func__, count); 621 } else { 622 spin_unlock_irqrestore(&dev->buflock, flags); 623 set_current_state(TASK_RUNNING); 624 remove_wait_queue(&dev->write_wait, &waita); 625 dbg(4," %s : sending, count = %Zd", __func__, count); 626 627 /* write the data into interrupt_out_buffer from userspace */ 628 buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); 629 bytes_to_write = count > buffer_size ? buffer_size : count; 630 dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd", 631 __func__, buffer_size, count, bytes_to_write); 632 633 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { 634 retval = -EFAULT; 635 goto exit; 636 } 637 638 /* send off the urb */ 639 usb_fill_int_urb( 640 dev->interrupt_out_urb, 641 dev->udev, 642 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 643 dev->interrupt_out_buffer, 644 bytes_to_write, 645 adu_interrupt_out_callback, 646 dev, 647 dev->interrupt_out_endpoint->bInterval); 648 dev->interrupt_out_urb->actual_length = bytes_to_write; 649 dev->out_urb_finished = 0; 650 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 651 if (retval < 0) { 652 dev->out_urb_finished = 1; 653 dev_err(&dev->udev->dev, "Couldn't submit " 654 "interrupt_out_urb %d\n", retval); 655 goto exit; 656 } 657 658 buffer += bytes_to_write; 659 count -= bytes_to_write; 660 661 bytes_written += bytes_to_write; 662 } 663 } 664 mutex_unlock(&dev->mtx); 665 return bytes_written; 666 667exit: 668 mutex_unlock(&dev->mtx); 669exit_nolock: 670 dbg(2," %s : leave, return value %d", __func__, retval); 671 return retval; 672 673exit_onqueue: 674 remove_wait_queue(&dev->write_wait, &waita); 675 return retval; 676} 677 678/* file operations needed when we register this driver */ 679static const struct file_operations adu_fops = { 680 .owner = THIS_MODULE, 681 .read = adu_read, 682 .write = adu_write, 683 .open = adu_open, 684 .release = adu_release, 685}; 686 687/* 688 * usb class driver info in order to get a minor number from the usb core, 689 * and to have the device registered with devfs and the driver core 690 */ 691static struct usb_class_driver adu_class = { 692 .name = "usb/adutux%d", 693 .fops = &adu_fops, 694 .minor_base = ADU_MINOR_BASE, 695}; 696 697/** 698 * adu_probe 699 * 700 * Called by the usb core when a new device is connected that it thinks 701 * this driver might be interested in. 702 */ 703static int adu_probe(struct usb_interface *interface, 704 const struct usb_device_id *id) 705{ 706 struct usb_device *udev = interface_to_usbdev(interface); 707 struct adu_device *dev = NULL; 708 struct usb_host_interface *iface_desc; 709 struct usb_endpoint_descriptor *endpoint; 710 int retval = -ENODEV; 711 int in_end_size; 712 int out_end_size; 713 int i; 714 715 dbg(2," %s : enter", __func__); 716 717 if (udev == NULL) { 718 dev_err(&interface->dev, "udev is NULL.\n"); 719 goto exit; 720 } 721 722 /* allocate memory for our device state and intialize it */ 723 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); 724 if (dev == NULL) { 725 dev_err(&interface->dev, "Out of memory\n"); 726 retval = -ENOMEM; 727 goto exit; 728 } 729 730 mutex_init(&dev->mtx); 731 spin_lock_init(&dev->buflock); 732 dev->udev = udev; 733 init_waitqueue_head(&dev->read_wait); 734 init_waitqueue_head(&dev->write_wait); 735 736 iface_desc = &interface->altsetting[0]; 737 738 /* set up the endpoint information */ 739 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 740 endpoint = &iface_desc->endpoint[i].desc; 741 742 if (usb_endpoint_is_int_in(endpoint)) 743 dev->interrupt_in_endpoint = endpoint; 744 745 if (usb_endpoint_is_int_out(endpoint)) 746 dev->interrupt_out_endpoint = endpoint; 747 } 748 if (dev->interrupt_in_endpoint == NULL) { 749 dev_err(&interface->dev, "interrupt in endpoint not found\n"); 750 goto error; 751 } 752 if (dev->interrupt_out_endpoint == NULL) { 753 dev_err(&interface->dev, "interrupt out endpoint not found\n"); 754 goto error; 755 } 756 757 in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); 758 out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); 759 760 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); 761 if (!dev->read_buffer_primary) { 762 dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n"); 763 retval = -ENOMEM; 764 goto error; 765 } 766 767 /* debug code prime the buffer */ 768 memset(dev->read_buffer_primary, 'a', in_end_size); 769 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); 770 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); 771 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); 772 773 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); 774 if (!dev->read_buffer_secondary) { 775 dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n"); 776 retval = -ENOMEM; 777 goto error; 778 } 779 780 /* debug code prime the buffer */ 781 memset(dev->read_buffer_secondary, 'e', in_end_size); 782 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); 783 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); 784 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); 785 786 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); 787 if (!dev->interrupt_in_buffer) { 788 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n"); 789 goto error; 790 } 791 792 /* debug code prime the buffer */ 793 memset(dev->interrupt_in_buffer, 'i', in_end_size); 794 795 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 796 if (!dev->interrupt_in_urb) { 797 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); 798 goto error; 799 } 800 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); 801 if (!dev->interrupt_out_buffer) { 802 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n"); 803 goto error; 804 } 805 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 806 if (!dev->interrupt_out_urb) { 807 dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n"); 808 goto error; 809 } 810 811 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, 812 sizeof(dev->serial_number))) { 813 dev_err(&interface->dev, "Could not retrieve serial number\n"); 814 goto error; 815 } 816 dbg(2," %s : serial_number=%s", __func__, dev->serial_number); 817 818 /* we can register the device now, as it is ready */ 819 usb_set_intfdata(interface, dev); 820 821 retval = usb_register_dev(interface, &adu_class); 822 823 if (retval) { 824 /* something prevented us from registering this driver */ 825 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 826 usb_set_intfdata(interface, NULL); 827 goto error; 828 } 829 830 dev->minor = interface->minor; 831 832 /* let the user know what node this device is now attached to */ 833 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", 834 udev->descriptor.idProduct, dev->serial_number, 835 (dev->minor - ADU_MINOR_BASE)); 836exit: 837 dbg(2," %s : leave, return value %p (dev)", __func__, dev); 838 839 return retval; 840 841error: 842 adu_delete(dev); 843 return retval; 844} 845 846/** 847 * adu_disconnect 848 * 849 * Called by the usb core when the device is removed from the system. 850 */ 851static void adu_disconnect(struct usb_interface *interface) 852{ 853 struct adu_device *dev; 854 int minor; 855 856 dbg(2," %s : enter", __func__); 857 858 dev = usb_get_intfdata(interface); 859 860 mutex_lock(&dev->mtx); /* not interruptible */ 861 dev->udev = NULL; /* poison */ 862 minor = dev->minor; 863 usb_deregister_dev(interface, &adu_class); 864 mutex_unlock(&dev->mtx); 865 866 mutex_lock(&adutux_mutex); 867 usb_set_intfdata(interface, NULL); 868 869 /* if the device is not opened, then we clean up right now */ 870 dbg(2," %s : open count %d", __func__, dev->open_count); 871 if (!dev->open_count) 872 adu_delete(dev); 873 874 mutex_unlock(&adutux_mutex); 875 876 dev_info(&interface->dev, "ADU device adutux%d now disconnected\n", 877 (minor - ADU_MINOR_BASE)); 878 879 dbg(2," %s : leave", __func__); 880} 881 882/* usb specific object needed to register this driver with the usb subsystem */ 883static struct usb_driver adu_driver = { 884 .name = "adutux", 885 .probe = adu_probe, 886 .disconnect = adu_disconnect, 887 .id_table = device_table, 888}; 889 890static int __init adu_init(void) 891{ 892 int result; 893 894 dbg(2," %s : enter", __func__); 895 896 /* register this driver with the USB subsystem */ 897 result = usb_register(&adu_driver); 898 if (result < 0) { 899 printk(KERN_ERR "usb_register failed for the "__FILE__ 900 " driver. Error number %d\n", result); 901 goto exit; 902 } 903 904 printk(KERN_INFO "adutux " DRIVER_DESC " " DRIVER_VERSION "\n"); 905 printk(KERN_INFO "adutux is an experimental driver. " 906 "Use at your own risk\n"); 907 908exit: 909 dbg(2," %s : leave, return value %d", __func__, result); 910 911 return result; 912} 913 914static void __exit adu_exit(void) 915{ 916 dbg(2," %s : enter", __func__); 917 /* deregister this driver with the USB subsystem */ 918 usb_deregister(&adu_driver); 919 dbg(2," %s : leave", __func__); 920} 921 922module_init(adu_init); 923module_exit(adu_exit); 924 925MODULE_AUTHOR(DRIVER_AUTHOR); 926MODULE_DESCRIPTION(DRIVER_DESC); 927MODULE_LICENSE("GPL"); 928