1 /* 2 * Native support for the I/O-Warrior USB devices 3 * 4 * Copyright (c) 2003-2005 Code Mercenaries GmbH 5 * written by Christian Lucht <lucht@codemercs.com> 6 * 7 * based on 8 9 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com> 10 * brlvger.c by Stephane Dalton <sdalton@videotron.ca> 11 * and St�hane Doyon <s.doyon@videotron.ca> 12 * 13 * Released under the GPLv2. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/usb.h> 18 #include <linux/slab.h> 19 #include <linux/sched.h> 20 #include <linux/mutex.h> 21 #include <linux/poll.h> 22 #include <linux/usb/iowarrior.h> 23 24 /* Version Information */ 25 #define DRIVER_VERSION "v0.4.0" 26 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" 27 #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)" 28 29 #define USB_VENDOR_ID_CODEMERCS 1984 30 /* low speed iowarrior */ 31 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 32 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 33 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 34 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 35 /* full speed iowarrior */ 36 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 37 38 /* Get a minor range for your devices from the usb maintainer */ 39 #ifdef CONFIG_USB_DYNAMIC_MINORS 40 #define IOWARRIOR_MINOR_BASE 0 41 #else 42 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet 43 #endif 44 45 /* interrupt input queue size */ 46 #define MAX_INTERRUPT_BUFFER 16 47 /* 48 maximum number of urbs that are submitted for writes at the same time, 49 this applies to the IOWarrior56 only! 50 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. 51 */ 52 #define MAX_WRITES_IN_FLIGHT 4 53 54 MODULE_AUTHOR(DRIVER_AUTHOR); 55 MODULE_DESCRIPTION(DRIVER_DESC); 56 MODULE_LICENSE("GPL"); 57 58 /* Module parameters */ 59 static DEFINE_MUTEX(iowarrior_mutex); 60 61 static struct usb_driver iowarrior_driver; 62 static DEFINE_MUTEX(iowarrior_open_disc_lock); 63 64 /*--------------*/ 65 /* data */ 66 /*--------------*/ 67 68 /* Structure to hold all of our device specific stuff */ 69 struct iowarrior { 70 struct mutex mutex; /* locks this structure */ 71 struct usb_device *udev; /* save off the usb device pointer */ 72 struct usb_interface *interface; /* the interface for this device */ 73 unsigned char minor; /* the starting minor number for this device */ 74 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ 75 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ 76 struct urb *int_in_urb; /* the urb for reading data */ 77 unsigned char *int_in_buffer; /* buffer for data to be read */ 78 unsigned char serial_number; /* to detect lost packages */ 79 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ 80 wait_queue_head_t read_wait; 81 wait_queue_head_t write_wait; /* wait-queue for writing to the device */ 82 atomic_t write_busy; /* number of write-urbs submitted */ 83 atomic_t read_idx; 84 atomic_t intr_idx; 85 spinlock_t intr_idx_lock; /* protects intr_idx */ 86 atomic_t overflow_flag; /* signals an index 'rollover' */ 87 int present; /* this is 1 as long as the device is connected */ 88 int opened; /* this is 1 if the device is currently open */ 89 char chip_serial[9]; /* the serial number string of the chip connected */ 90 int report_size; /* number of bytes in a report */ 91 u16 product_id; 92 }; 93 94 /*--------------*/ 95 /* globals */ 96 /*--------------*/ 97 98 /* 99 * USB spec identifies 5 second timeouts. 100 */ 101 #define GET_TIMEOUT 5 102 #define USB_REQ_GET_REPORT 0x01 103 //#if 0 104 static int usb_get_report(struct usb_device *dev, 105 struct usb_host_interface *inter, unsigned char type, 106 unsigned char id, void *buf, int size) 107 { 108 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 109 USB_REQ_GET_REPORT, 110 USB_DIR_IN | USB_TYPE_CLASS | 111 USB_RECIP_INTERFACE, (type << 8) + id, 112 inter->desc.bInterfaceNumber, buf, size, 113 GET_TIMEOUT*HZ); 114 } 115 //#endif 116 117 #define USB_REQ_SET_REPORT 0x09 118 119 static int usb_set_report(struct usb_interface *intf, unsigned char type, 120 unsigned char id, void *buf, int size) 121 { 122 return usb_control_msg(interface_to_usbdev(intf), 123 usb_sndctrlpipe(interface_to_usbdev(intf), 0), 124 USB_REQ_SET_REPORT, 125 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 126 (type << 8) + id, 127 intf->cur_altsetting->desc.bInterfaceNumber, buf, 128 size, HZ); 129 } 130 131 /*---------------------*/ 132 /* driver registration */ 133 /*---------------------*/ 134 /* table of devices that work with this driver */ 135 static const struct usb_device_id iowarrior_ids[] = { 136 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, 137 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, 138 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, 139 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, 140 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, 141 {} /* Terminating entry */ 142 }; 143 MODULE_DEVICE_TABLE(usb, iowarrior_ids); 144 145 /* 146 * USB callback handler for reading data 147 */ 148 static void iowarrior_callback(struct urb *urb) 149 { 150 struct iowarrior *dev = urb->context; 151 int intr_idx; 152 int read_idx; 153 int aux_idx; 154 int offset; 155 int status = urb->status; 156 int retval; 157 158 switch (status) { 159 case 0: 160 /* success */ 161 break; 162 case -ECONNRESET: 163 case -ENOENT: 164 case -ESHUTDOWN: 165 return; 166 default: 167 goto exit; 168 } 169 170 spin_lock(&dev->intr_idx_lock); 171 intr_idx = atomic_read(&dev->intr_idx); 172 /* aux_idx become previous intr_idx */ 173 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); 174 read_idx = atomic_read(&dev->read_idx); 175 176 /* queue is not empty and it's interface 0 */ 177 if ((intr_idx != read_idx) 178 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { 179 /* + 1 for serial number */ 180 offset = aux_idx * (dev->report_size + 1); 181 if (!memcmp 182 (dev->read_queue + offset, urb->transfer_buffer, 183 dev->report_size)) { 184 /* equal values on interface 0 will be ignored */ 185 spin_unlock(&dev->intr_idx_lock); 186 goto exit; 187 } 188 } 189 190 /* aux_idx become next intr_idx */ 191 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); 192 if (read_idx == aux_idx) { 193 /* queue full, dropping oldest input */ 194 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; 195 atomic_set(&dev->read_idx, read_idx); 196 atomic_set(&dev->overflow_flag, 1); 197 } 198 199 /* +1 for serial number */ 200 offset = intr_idx * (dev->report_size + 1); 201 memcpy(dev->read_queue + offset, urb->transfer_buffer, 202 dev->report_size); 203 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; 204 205 atomic_set(&dev->intr_idx, aux_idx); 206 spin_unlock(&dev->intr_idx_lock); 207 /* tell the blocking read about the new data */ 208 wake_up_interruptible(&dev->read_wait); 209 210 exit: 211 retval = usb_submit_urb(urb, GFP_ATOMIC); 212 if (retval) 213 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", 214 __func__, retval); 215 216 } 217 218 /* 219 * USB Callback handler for write-ops 220 */ 221 static void iowarrior_write_callback(struct urb *urb) 222 { 223 struct iowarrior *dev; 224 int status = urb->status; 225 226 dev = urb->context; 227 /* sync/async unlink faults aren't errors */ 228 if (status && 229 !(status == -ENOENT || 230 status == -ECONNRESET || status == -ESHUTDOWN)) { 231 dev_dbg(&dev->interface->dev, 232 "nonzero write bulk status received: %d\n", status); 233 } 234 /* free up our allocated buffer */ 235 usb_free_coherent(urb->dev, urb->transfer_buffer_length, 236 urb->transfer_buffer, urb->transfer_dma); 237 /* tell a waiting writer the interrupt-out-pipe is available again */ 238 atomic_dec(&dev->write_busy); 239 wake_up_interruptible(&dev->write_wait); 240 } 241 242 /** 243 * iowarrior_delete 244 */ 245 static inline void iowarrior_delete(struct iowarrior *dev) 246 { 247 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); 248 kfree(dev->int_in_buffer); 249 usb_free_urb(dev->int_in_urb); 250 kfree(dev->read_queue); 251 kfree(dev); 252 } 253 254 /*---------------------*/ 255 /* fops implementation */ 256 /*---------------------*/ 257 258 static int read_index(struct iowarrior *dev) 259 { 260 int intr_idx, read_idx; 261 262 read_idx = atomic_read(&dev->read_idx); 263 intr_idx = atomic_read(&dev->intr_idx); 264 265 return (read_idx == intr_idx ? -1 : read_idx); 266 } 267 268 /** 269 * iowarrior_read 270 */ 271 static ssize_t iowarrior_read(struct file *file, char __user *buffer, 272 size_t count, loff_t *ppos) 273 { 274 struct iowarrior *dev; 275 int read_idx; 276 int offset; 277 278 dev = file->private_data; 279 280 /* verify that the device wasn't unplugged */ 281 if (dev == NULL || !dev->present) 282 return -ENODEV; 283 284 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", 285 dev->minor, count); 286 287 /* read count must be packet size (+ time stamp) */ 288 if ((count != dev->report_size) 289 && (count != (dev->report_size + 1))) 290 return -EINVAL; 291 292 /* repeat until no buffer overrun in callback handler occur */ 293 do { 294 atomic_set(&dev->overflow_flag, 0); 295 if ((read_idx = read_index(dev)) == -1) { 296 /* queue empty */ 297 if (file->f_flags & O_NONBLOCK) 298 return -EAGAIN; 299 else { 300 //next line will return when there is either new data, or the device is unplugged 301 int r = wait_event_interruptible(dev->read_wait, 302 (!dev->present 303 || (read_idx = 304 read_index 305 (dev)) != 306 -1)); 307 if (r) { 308 //we were interrupted by a signal 309 return -ERESTART; 310 } 311 if (!dev->present) { 312 //The device was unplugged 313 return -ENODEV; 314 } 315 if (read_idx == -1) { 316 // Can this happen ??? 317 return 0; 318 } 319 } 320 } 321 322 offset = read_idx * (dev->report_size + 1); 323 if (copy_to_user(buffer, dev->read_queue + offset, count)) { 324 return -EFAULT; 325 } 326 } while (atomic_read(&dev->overflow_flag)); 327 328 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; 329 atomic_set(&dev->read_idx, read_idx); 330 return count; 331 } 332 333 /* 334 * iowarrior_write 335 */ 336 static ssize_t iowarrior_write(struct file *file, 337 const char __user *user_buffer, 338 size_t count, loff_t *ppos) 339 { 340 struct iowarrior *dev; 341 int retval = 0; 342 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ 343 struct urb *int_out_urb = NULL; 344 345 dev = file->private_data; 346 347 mutex_lock(&dev->mutex); 348 /* verify that the device wasn't unplugged */ 349 if (!dev->present) { 350 retval = -ENODEV; 351 goto exit; 352 } 353 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", 354 dev->minor, count); 355 /* if count is 0 we're already done */ 356 if (count == 0) { 357 retval = 0; 358 goto exit; 359 } 360 /* We only accept full reports */ 361 if (count != dev->report_size) { 362 retval = -EINVAL; 363 goto exit; 364 } 365 switch (dev->product_id) { 366 case USB_DEVICE_ID_CODEMERCS_IOW24: 367 case USB_DEVICE_ID_CODEMERCS_IOWPV1: 368 case USB_DEVICE_ID_CODEMERCS_IOWPV2: 369 case USB_DEVICE_ID_CODEMERCS_IOW40: 370 /* IOW24 and IOW40 use a synchronous call */ 371 buf = kmalloc(count, GFP_KERNEL); 372 if (!buf) { 373 retval = -ENOMEM; 374 goto exit; 375 } 376 if (copy_from_user(buf, user_buffer, count)) { 377 retval = -EFAULT; 378 kfree(buf); 379 goto exit; 380 } 381 retval = usb_set_report(dev->interface, 2, 0, buf, count); 382 kfree(buf); 383 goto exit; 384 break; 385 case USB_DEVICE_ID_CODEMERCS_IOW56: 386 /* The IOW56 uses asynchronous IO and more urbs */ 387 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { 388 /* Wait until we are below the limit for submitted urbs */ 389 if (file->f_flags & O_NONBLOCK) { 390 retval = -EAGAIN; 391 goto exit; 392 } else { 393 retval = wait_event_interruptible(dev->write_wait, 394 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); 395 if (retval) { 396 /* we were interrupted by a signal */ 397 retval = -ERESTART; 398 goto exit; 399 } 400 if (!dev->present) { 401 /* The device was unplugged */ 402 retval = -ENODEV; 403 goto exit; 404 } 405 if (!dev->opened) { 406 /* We were closed while waiting for an URB */ 407 retval = -ENODEV; 408 goto exit; 409 } 410 } 411 } 412 atomic_inc(&dev->write_busy); 413 int_out_urb = usb_alloc_urb(0, GFP_KERNEL); 414 if (!int_out_urb) { 415 retval = -ENOMEM; 416 dev_dbg(&dev->interface->dev, 417 "Unable to allocate urb\n"); 418 goto error_no_urb; 419 } 420 buf = usb_alloc_coherent(dev->udev, dev->report_size, 421 GFP_KERNEL, &int_out_urb->transfer_dma); 422 if (!buf) { 423 retval = -ENOMEM; 424 dev_dbg(&dev->interface->dev, 425 "Unable to allocate buffer\n"); 426 goto error_no_buffer; 427 } 428 usb_fill_int_urb(int_out_urb, dev->udev, 429 usb_sndintpipe(dev->udev, 430 dev->int_out_endpoint->bEndpointAddress), 431 buf, dev->report_size, 432 iowarrior_write_callback, dev, 433 dev->int_out_endpoint->bInterval); 434 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 435 if (copy_from_user(buf, user_buffer, count)) { 436 retval = -EFAULT; 437 goto error; 438 } 439 retval = usb_submit_urb(int_out_urb, GFP_KERNEL); 440 if (retval) { 441 dev_dbg(&dev->interface->dev, 442 "submit error %d for urb nr.%d\n", 443 retval, atomic_read(&dev->write_busy)); 444 goto error; 445 } 446 /* submit was ok */ 447 retval = count; 448 usb_free_urb(int_out_urb); 449 goto exit; 450 break; 451 default: 452 /* what do we have here ? An unsupported Product-ID ? */ 453 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", 454 __func__, dev->product_id); 455 retval = -EFAULT; 456 goto exit; 457 break; 458 } 459 error: 460 usb_free_coherent(dev->udev, dev->report_size, buf, 461 int_out_urb->transfer_dma); 462 error_no_buffer: 463 usb_free_urb(int_out_urb); 464 error_no_urb: 465 atomic_dec(&dev->write_busy); 466 wake_up_interruptible(&dev->write_wait); 467 exit: 468 mutex_unlock(&dev->mutex); 469 return retval; 470 } 471 472 /** 473 * iowarrior_ioctl 474 */ 475 static long iowarrior_ioctl(struct file *file, unsigned int cmd, 476 unsigned long arg) 477 { 478 struct iowarrior *dev = NULL; 479 __u8 *buffer; 480 __u8 __user *user_buffer; 481 int retval; 482 int io_res; /* checks for bytes read/written and copy_to/from_user results */ 483 484 dev = file->private_data; 485 if (dev == NULL) { 486 return -ENODEV; 487 } 488 489 buffer = kzalloc(dev->report_size, GFP_KERNEL); 490 if (!buffer) 491 return -ENOMEM; 492 493 /* lock this object */ 494 mutex_lock(&iowarrior_mutex); 495 mutex_lock(&dev->mutex); 496 497 /* verify that the device wasn't unplugged */ 498 if (!dev->present) { 499 retval = -ENODEV; 500 goto error_out; 501 } 502 503 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", 504 dev->minor, cmd, arg); 505 506 retval = 0; 507 io_res = 0; 508 switch (cmd) { 509 case IOW_WRITE: 510 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || 511 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || 512 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || 513 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { 514 user_buffer = (__u8 __user *)arg; 515 io_res = copy_from_user(buffer, user_buffer, 516 dev->report_size); 517 if (io_res) { 518 retval = -EFAULT; 519 } else { 520 io_res = usb_set_report(dev->interface, 2, 0, 521 buffer, 522 dev->report_size); 523 if (io_res < 0) 524 retval = io_res; 525 } 526 } else { 527 retval = -EINVAL; 528 dev_err(&dev->interface->dev, 529 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", 530 dev->product_id); 531 } 532 break; 533 case IOW_READ: 534 user_buffer = (__u8 __user *)arg; 535 io_res = usb_get_report(dev->udev, 536 dev->interface->cur_altsetting, 1, 0, 537 buffer, dev->report_size); 538 if (io_res < 0) 539 retval = io_res; 540 else { 541 io_res = copy_to_user(user_buffer, buffer, dev->report_size); 542 if (io_res) 543 retval = -EFAULT; 544 } 545 break; 546 case IOW_GETINFO: 547 { 548 /* Report available information for the device */ 549 struct iowarrior_info info; 550 /* needed for power consumption */ 551 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; 552 553 memset(&info, 0, sizeof(info)); 554 /* directly from the descriptor */ 555 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); 556 info.product = dev->product_id; 557 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); 558 559 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ 560 info.speed = le16_to_cpu(dev->udev->speed); 561 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; 562 info.report_size = dev->report_size; 563 564 /* serial number string has been read earlier 8 chars or empty string */ 565 memcpy(info.serial, dev->chip_serial, 566 sizeof(dev->chip_serial)); 567 if (cfg_descriptor == NULL) { 568 info.power = -1; /* no information available */ 569 } else { 570 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ 571 info.power = cfg_descriptor->bMaxPower * 2; 572 } 573 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, 574 sizeof(struct iowarrior_info)); 575 if (io_res) 576 retval = -EFAULT; 577 break; 578 } 579 default: 580 /* return that we did not understand this ioctl call */ 581 retval = -ENOTTY; 582 break; 583 } 584 error_out: 585 /* unlock the device */ 586 mutex_unlock(&dev->mutex); 587 mutex_unlock(&iowarrior_mutex); 588 kfree(buffer); 589 return retval; 590 } 591 592 /** 593 * iowarrior_open 594 */ 595 static int iowarrior_open(struct inode *inode, struct file *file) 596 { 597 struct iowarrior *dev = NULL; 598 struct usb_interface *interface; 599 int subminor; 600 int retval = 0; 601 602 mutex_lock(&iowarrior_mutex); 603 subminor = iminor(inode); 604 605 interface = usb_find_interface(&iowarrior_driver, subminor); 606 if (!interface) { 607 mutex_unlock(&iowarrior_mutex); 608 printk(KERN_ERR "%s - error, can't find device for minor %d\n", 609 __func__, subminor); 610 return -ENODEV; 611 } 612 613 mutex_lock(&iowarrior_open_disc_lock); 614 dev = usb_get_intfdata(interface); 615 if (!dev) { 616 mutex_unlock(&iowarrior_open_disc_lock); 617 mutex_unlock(&iowarrior_mutex); 618 return -ENODEV; 619 } 620 621 mutex_lock(&dev->mutex); 622 mutex_unlock(&iowarrior_open_disc_lock); 623 624 /* Only one process can open each device, no sharing. */ 625 if (dev->opened) { 626 retval = -EBUSY; 627 goto out; 628 } 629 630 /* setup interrupt handler for receiving values */ 631 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { 632 dev_err(&interface->dev, "Error %d while submitting URB\n", retval); 633 retval = -EFAULT; 634 goto out; 635 } 636 /* increment our usage count for the driver */ 637 ++dev->opened; 638 /* save our object in the file's private structure */ 639 file->private_data = dev; 640 retval = 0; 641 642 out: 643 mutex_unlock(&dev->mutex); 644 mutex_unlock(&iowarrior_mutex); 645 return retval; 646 } 647 648 /** 649 * iowarrior_release 650 */ 651 static int iowarrior_release(struct inode *inode, struct file *file) 652 { 653 struct iowarrior *dev; 654 int retval = 0; 655 656 dev = file->private_data; 657 if (dev == NULL) { 658 return -ENODEV; 659 } 660 661 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); 662 663 /* lock our device */ 664 mutex_lock(&dev->mutex); 665 666 if (dev->opened <= 0) { 667 retval = -ENODEV; /* close called more than once */ 668 mutex_unlock(&dev->mutex); 669 } else { 670 dev->opened = 0; /* we're closing now */ 671 retval = 0; 672 if (dev->present) { 673 /* 674 The device is still connected so we only shutdown 675 pending read-/write-ops. 676 */ 677 usb_kill_urb(dev->int_in_urb); 678 wake_up_interruptible(&dev->read_wait); 679 wake_up_interruptible(&dev->write_wait); 680 mutex_unlock(&dev->mutex); 681 } else { 682 /* The device was unplugged, cleanup resources */ 683 mutex_unlock(&dev->mutex); 684 iowarrior_delete(dev); 685 } 686 } 687 return retval; 688 } 689 690 static unsigned iowarrior_poll(struct file *file, poll_table * wait) 691 { 692 struct iowarrior *dev = file->private_data; 693 unsigned int mask = 0; 694 695 if (!dev->present) 696 return POLLERR | POLLHUP; 697 698 poll_wait(file, &dev->read_wait, wait); 699 poll_wait(file, &dev->write_wait, wait); 700 701 if (!dev->present) 702 return POLLERR | POLLHUP; 703 704 if (read_index(dev) != -1) 705 mask |= POLLIN | POLLRDNORM; 706 707 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) 708 mask |= POLLOUT | POLLWRNORM; 709 return mask; 710 } 711 712 /* 713 * File operations needed when we register this driver. 714 * This assumes that this driver NEEDS file operations, 715 * of course, which means that the driver is expected 716 * to have a node in the /dev directory. If the USB 717 * device were for a network interface then the driver 718 * would use "struct net_driver" instead, and a serial 719 * device would use "struct tty_driver". 720 */ 721 static const struct file_operations iowarrior_fops = { 722 .owner = THIS_MODULE, 723 .write = iowarrior_write, 724 .read = iowarrior_read, 725 .unlocked_ioctl = iowarrior_ioctl, 726 .open = iowarrior_open, 727 .release = iowarrior_release, 728 .poll = iowarrior_poll, 729 .llseek = noop_llseek, 730 }; 731 732 static char *iowarrior_devnode(struct device *dev, umode_t *mode) 733 { 734 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 735 } 736 737 /* 738 * usb class driver info in order to get a minor number from the usb core, 739 * and to have the device registered with devfs and the driver core 740 */ 741 static struct usb_class_driver iowarrior_class = { 742 .name = "iowarrior%d", 743 .devnode = iowarrior_devnode, 744 .fops = &iowarrior_fops, 745 .minor_base = IOWARRIOR_MINOR_BASE, 746 }; 747 748 /*---------------------------------*/ 749 /* probe and disconnect functions */ 750 /*---------------------------------*/ 751 /** 752 * iowarrior_probe 753 * 754 * Called by the usb core when a new device is connected that it thinks 755 * this driver might be interested in. 756 */ 757 static int iowarrior_probe(struct usb_interface *interface, 758 const struct usb_device_id *id) 759 { 760 struct usb_device *udev = interface_to_usbdev(interface); 761 struct iowarrior *dev = NULL; 762 struct usb_host_interface *iface_desc; 763 struct usb_endpoint_descriptor *endpoint; 764 int i; 765 int retval = -ENOMEM; 766 767 /* allocate memory for our device state and initialize it */ 768 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); 769 if (dev == NULL) { 770 dev_err(&interface->dev, "Out of memory\n"); 771 return retval; 772 } 773 774 mutex_init(&dev->mutex); 775 776 atomic_set(&dev->intr_idx, 0); 777 atomic_set(&dev->read_idx, 0); 778 spin_lock_init(&dev->intr_idx_lock); 779 atomic_set(&dev->overflow_flag, 0); 780 init_waitqueue_head(&dev->read_wait); 781 atomic_set(&dev->write_busy, 0); 782 init_waitqueue_head(&dev->write_wait); 783 784 dev->udev = udev; 785 dev->interface = interface; 786 787 iface_desc = interface->cur_altsetting; 788 dev->product_id = le16_to_cpu(udev->descriptor.idProduct); 789 790 if (iface_desc->desc.bNumEndpoints < 1) { 791 dev_err(&interface->dev, "Invalid number of endpoints\n"); 792 retval = -EINVAL; 793 goto error; 794 } 795 796 /* set up the endpoint information */ 797 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 798 endpoint = &iface_desc->endpoint[i].desc; 799 800 if (usb_endpoint_is_int_in(endpoint)) 801 dev->int_in_endpoint = endpoint; 802 if (usb_endpoint_is_int_out(endpoint)) 803 /* this one will match for the IOWarrior56 only */ 804 dev->int_out_endpoint = endpoint; 805 } 806 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */ 807 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); 808 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && 809 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) 810 /* IOWarrior56 has wMaxPacketSize different from report size */ 811 dev->report_size = 7; 812 813 /* create the urb and buffer for reading */ 814 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); 815 if (!dev->int_in_urb) { 816 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); 817 goto error; 818 } 819 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); 820 if (!dev->int_in_buffer) { 821 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n"); 822 goto error; 823 } 824 usb_fill_int_urb(dev->int_in_urb, dev->udev, 825 usb_rcvintpipe(dev->udev, 826 dev->int_in_endpoint->bEndpointAddress), 827 dev->int_in_buffer, dev->report_size, 828 iowarrior_callback, dev, 829 dev->int_in_endpoint->bInterval); 830 /* create an internal buffer for interrupt data from the device */ 831 dev->read_queue = 832 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER), 833 GFP_KERNEL); 834 if (!dev->read_queue) { 835 dev_err(&interface->dev, "Couldn't allocate read_queue\n"); 836 goto error; 837 } 838 /* Get the serial-number of the chip */ 839 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 840 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, 841 sizeof(dev->chip_serial)); 842 if (strlen(dev->chip_serial) != 8) 843 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 844 845 /* Set the idle timeout to 0, if this is interface 0 */ 846 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { 847 usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 848 0x0A, 849 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 850 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 851 } 852 /* allow device read and ioctl */ 853 dev->present = 1; 854 855 /* we can register the device now, as it is ready */ 856 usb_set_intfdata(interface, dev); 857 858 retval = usb_register_dev(interface, &iowarrior_class); 859 if (retval) { 860 /* something prevented us from registering this driver */ 861 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 862 usb_set_intfdata(interface, NULL); 863 goto error; 864 } 865 866 dev->minor = interface->minor; 867 868 /* let the user know what node this device is now attached to */ 869 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " 870 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, 871 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); 872 return retval; 873 874 error: 875 iowarrior_delete(dev); 876 return retval; 877 } 878 879 /** 880 * iowarrior_disconnect 881 * 882 * Called by the usb core when the device is removed from the system. 883 */ 884 static void iowarrior_disconnect(struct usb_interface *interface) 885 { 886 struct iowarrior *dev; 887 int minor; 888 889 dev = usb_get_intfdata(interface); 890 mutex_lock(&iowarrior_open_disc_lock); 891 usb_set_intfdata(interface, NULL); 892 893 minor = dev->minor; 894 895 /* give back our minor */ 896 usb_deregister_dev(interface, &iowarrior_class); 897 898 mutex_lock(&dev->mutex); 899 900 /* prevent device read, write and ioctl */ 901 dev->present = 0; 902 903 mutex_unlock(&dev->mutex); 904 mutex_unlock(&iowarrior_open_disc_lock); 905 906 if (dev->opened) { 907 /* There is a process that holds a filedescriptor to the device , 908 so we only shutdown read-/write-ops going on. 909 Deleting the device is postponed until close() was called. 910 */ 911 usb_kill_urb(dev->int_in_urb); 912 wake_up_interruptible(&dev->read_wait); 913 wake_up_interruptible(&dev->write_wait); 914 } else { 915 /* no process is using the device, cleanup now */ 916 iowarrior_delete(dev); 917 } 918 919 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", 920 minor - IOWARRIOR_MINOR_BASE); 921 } 922 923 /* usb specific object needed to register this driver with the usb subsystem */ 924 static struct usb_driver iowarrior_driver = { 925 .name = "iowarrior", 926 .probe = iowarrior_probe, 927 .disconnect = iowarrior_disconnect, 928 .id_table = iowarrior_ids, 929 }; 930 931 module_usb_driver(iowarrior_driver); 932