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