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 || !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 = memdup_user(user_buffer, count); 372 if (IS_ERR(buf)) { 373 retval = PTR_ERR(buf); 374 goto exit; 375 } 376 retval = usb_set_report(dev->interface, 2, 0, buf, count); 377 kfree(buf); 378 goto exit; 379 break; 380 case USB_DEVICE_ID_CODEMERCS_IOW56: 381 /* The IOW56 uses asynchronous IO and more urbs */ 382 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { 383 /* Wait until we are below the limit for submitted urbs */ 384 if (file->f_flags & O_NONBLOCK) { 385 retval = -EAGAIN; 386 goto exit; 387 } else { 388 retval = wait_event_interruptible(dev->write_wait, 389 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); 390 if (retval) { 391 /* we were interrupted by a signal */ 392 retval = -ERESTART; 393 goto exit; 394 } 395 if (!dev->present) { 396 /* The device was unplugged */ 397 retval = -ENODEV; 398 goto exit; 399 } 400 if (!dev->opened) { 401 /* We were closed while waiting for an URB */ 402 retval = -ENODEV; 403 goto exit; 404 } 405 } 406 } 407 atomic_inc(&dev->write_busy); 408 int_out_urb = usb_alloc_urb(0, GFP_KERNEL); 409 if (!int_out_urb) { 410 retval = -ENOMEM; 411 goto error_no_urb; 412 } 413 buf = usb_alloc_coherent(dev->udev, dev->report_size, 414 GFP_KERNEL, &int_out_urb->transfer_dma); 415 if (!buf) { 416 retval = -ENOMEM; 417 dev_dbg(&dev->interface->dev, 418 "Unable to allocate buffer\n"); 419 goto error_no_buffer; 420 } 421 usb_fill_int_urb(int_out_urb, dev->udev, 422 usb_sndintpipe(dev->udev, 423 dev->int_out_endpoint->bEndpointAddress), 424 buf, dev->report_size, 425 iowarrior_write_callback, dev, 426 dev->int_out_endpoint->bInterval); 427 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 428 if (copy_from_user(buf, user_buffer, count)) { 429 retval = -EFAULT; 430 goto error; 431 } 432 retval = usb_submit_urb(int_out_urb, GFP_KERNEL); 433 if (retval) { 434 dev_dbg(&dev->interface->dev, 435 "submit error %d for urb nr.%d\n", 436 retval, atomic_read(&dev->write_busy)); 437 goto error; 438 } 439 /* submit was ok */ 440 retval = count; 441 usb_free_urb(int_out_urb); 442 goto exit; 443 break; 444 default: 445 /* what do we have here ? An unsupported Product-ID ? */ 446 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", 447 __func__, dev->product_id); 448 retval = -EFAULT; 449 goto exit; 450 break; 451 } 452 error: 453 usb_free_coherent(dev->udev, dev->report_size, buf, 454 int_out_urb->transfer_dma); 455 error_no_buffer: 456 usb_free_urb(int_out_urb); 457 error_no_urb: 458 atomic_dec(&dev->write_busy); 459 wake_up_interruptible(&dev->write_wait); 460 exit: 461 mutex_unlock(&dev->mutex); 462 return retval; 463 } 464 465 /** 466 * iowarrior_ioctl 467 */ 468 static long iowarrior_ioctl(struct file *file, unsigned int cmd, 469 unsigned long arg) 470 { 471 struct iowarrior *dev = NULL; 472 __u8 *buffer; 473 __u8 __user *user_buffer; 474 int retval; 475 int io_res; /* checks for bytes read/written and copy_to/from_user results */ 476 477 dev = file->private_data; 478 if (!dev) 479 return -ENODEV; 480 481 buffer = kzalloc(dev->report_size, GFP_KERNEL); 482 if (!buffer) 483 return -ENOMEM; 484 485 /* lock this object */ 486 mutex_lock(&iowarrior_mutex); 487 mutex_lock(&dev->mutex); 488 489 /* verify that the device wasn't unplugged */ 490 if (!dev->present) { 491 retval = -ENODEV; 492 goto error_out; 493 } 494 495 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", 496 dev->minor, cmd, arg); 497 498 retval = 0; 499 io_res = 0; 500 switch (cmd) { 501 case IOW_WRITE: 502 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || 503 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || 504 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || 505 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { 506 user_buffer = (__u8 __user *)arg; 507 io_res = copy_from_user(buffer, user_buffer, 508 dev->report_size); 509 if (io_res) { 510 retval = -EFAULT; 511 } else { 512 io_res = usb_set_report(dev->interface, 2, 0, 513 buffer, 514 dev->report_size); 515 if (io_res < 0) 516 retval = io_res; 517 } 518 } else { 519 retval = -EINVAL; 520 dev_err(&dev->interface->dev, 521 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", 522 dev->product_id); 523 } 524 break; 525 case IOW_READ: 526 user_buffer = (__u8 __user *)arg; 527 io_res = usb_get_report(dev->udev, 528 dev->interface->cur_altsetting, 1, 0, 529 buffer, dev->report_size); 530 if (io_res < 0) 531 retval = io_res; 532 else { 533 io_res = copy_to_user(user_buffer, buffer, dev->report_size); 534 if (io_res) 535 retval = -EFAULT; 536 } 537 break; 538 case IOW_GETINFO: 539 { 540 /* Report available information for the device */ 541 struct iowarrior_info info; 542 /* needed for power consumption */ 543 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; 544 545 memset(&info, 0, sizeof(info)); 546 /* directly from the descriptor */ 547 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); 548 info.product = dev->product_id; 549 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); 550 551 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ 552 info.speed = dev->udev->speed; 553 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; 554 info.report_size = dev->report_size; 555 556 /* serial number string has been read earlier 8 chars or empty string */ 557 memcpy(info.serial, dev->chip_serial, 558 sizeof(dev->chip_serial)); 559 if (cfg_descriptor == NULL) { 560 info.power = -1; /* no information available */ 561 } else { 562 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ 563 info.power = cfg_descriptor->bMaxPower * 2; 564 } 565 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, 566 sizeof(struct iowarrior_info)); 567 if (io_res) 568 retval = -EFAULT; 569 break; 570 } 571 default: 572 /* return that we did not understand this ioctl call */ 573 retval = -ENOTTY; 574 break; 575 } 576 error_out: 577 /* unlock the device */ 578 mutex_unlock(&dev->mutex); 579 mutex_unlock(&iowarrior_mutex); 580 kfree(buffer); 581 return retval; 582 } 583 584 /** 585 * iowarrior_open 586 */ 587 static int iowarrior_open(struct inode *inode, struct file *file) 588 { 589 struct iowarrior *dev = NULL; 590 struct usb_interface *interface; 591 int subminor; 592 int retval = 0; 593 594 mutex_lock(&iowarrior_mutex); 595 subminor = iminor(inode); 596 597 interface = usb_find_interface(&iowarrior_driver, subminor); 598 if (!interface) { 599 mutex_unlock(&iowarrior_mutex); 600 printk(KERN_ERR "%s - error, can't find device for minor %d\n", 601 __func__, subminor); 602 return -ENODEV; 603 } 604 605 mutex_lock(&iowarrior_open_disc_lock); 606 dev = usb_get_intfdata(interface); 607 if (!dev) { 608 mutex_unlock(&iowarrior_open_disc_lock); 609 mutex_unlock(&iowarrior_mutex); 610 return -ENODEV; 611 } 612 613 mutex_lock(&dev->mutex); 614 mutex_unlock(&iowarrior_open_disc_lock); 615 616 /* Only one process can open each device, no sharing. */ 617 if (dev->opened) { 618 retval = -EBUSY; 619 goto out; 620 } 621 622 /* setup interrupt handler for receiving values */ 623 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { 624 dev_err(&interface->dev, "Error %d while submitting URB\n", retval); 625 retval = -EFAULT; 626 goto out; 627 } 628 /* increment our usage count for the driver */ 629 ++dev->opened; 630 /* save our object in the file's private structure */ 631 file->private_data = dev; 632 retval = 0; 633 634 out: 635 mutex_unlock(&dev->mutex); 636 mutex_unlock(&iowarrior_mutex); 637 return retval; 638 } 639 640 /** 641 * iowarrior_release 642 */ 643 static int iowarrior_release(struct inode *inode, struct file *file) 644 { 645 struct iowarrior *dev; 646 int retval = 0; 647 648 dev = file->private_data; 649 if (!dev) 650 return -ENODEV; 651 652 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); 653 654 /* lock our device */ 655 mutex_lock(&dev->mutex); 656 657 if (dev->opened <= 0) { 658 retval = -ENODEV; /* close called more than once */ 659 mutex_unlock(&dev->mutex); 660 } else { 661 dev->opened = 0; /* we're closing now */ 662 retval = 0; 663 if (dev->present) { 664 /* 665 The device is still connected so we only shutdown 666 pending read-/write-ops. 667 */ 668 usb_kill_urb(dev->int_in_urb); 669 wake_up_interruptible(&dev->read_wait); 670 wake_up_interruptible(&dev->write_wait); 671 mutex_unlock(&dev->mutex); 672 } else { 673 /* The device was unplugged, cleanup resources */ 674 mutex_unlock(&dev->mutex); 675 iowarrior_delete(dev); 676 } 677 } 678 return retval; 679 } 680 681 static unsigned iowarrior_poll(struct file *file, poll_table * wait) 682 { 683 struct iowarrior *dev = file->private_data; 684 unsigned int mask = 0; 685 686 if (!dev->present) 687 return POLLERR | POLLHUP; 688 689 poll_wait(file, &dev->read_wait, wait); 690 poll_wait(file, &dev->write_wait, wait); 691 692 if (!dev->present) 693 return POLLERR | POLLHUP; 694 695 if (read_index(dev) != -1) 696 mask |= POLLIN | POLLRDNORM; 697 698 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) 699 mask |= POLLOUT | POLLWRNORM; 700 return mask; 701 } 702 703 /* 704 * File operations needed when we register this driver. 705 * This assumes that this driver NEEDS file operations, 706 * of course, which means that the driver is expected 707 * to have a node in the /dev directory. If the USB 708 * device were for a network interface then the driver 709 * would use "struct net_driver" instead, and a serial 710 * device would use "struct tty_driver". 711 */ 712 static const struct file_operations iowarrior_fops = { 713 .owner = THIS_MODULE, 714 .write = iowarrior_write, 715 .read = iowarrior_read, 716 .unlocked_ioctl = iowarrior_ioctl, 717 .open = iowarrior_open, 718 .release = iowarrior_release, 719 .poll = iowarrior_poll, 720 .llseek = noop_llseek, 721 }; 722 723 static char *iowarrior_devnode(struct device *dev, umode_t *mode) 724 { 725 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 726 } 727 728 /* 729 * usb class driver info in order to get a minor number from the usb core, 730 * and to have the device registered with devfs and the driver core 731 */ 732 static struct usb_class_driver iowarrior_class = { 733 .name = "iowarrior%d", 734 .devnode = iowarrior_devnode, 735 .fops = &iowarrior_fops, 736 .minor_base = IOWARRIOR_MINOR_BASE, 737 }; 738 739 /*---------------------------------*/ 740 /* probe and disconnect functions */ 741 /*---------------------------------*/ 742 /** 743 * iowarrior_probe 744 * 745 * Called by the usb core when a new device is connected that it thinks 746 * this driver might be interested in. 747 */ 748 static int iowarrior_probe(struct usb_interface *interface, 749 const struct usb_device_id *id) 750 { 751 struct usb_device *udev = interface_to_usbdev(interface); 752 struct iowarrior *dev = NULL; 753 struct usb_host_interface *iface_desc; 754 int retval = -ENOMEM; 755 int res; 756 757 /* allocate memory for our device state and initialize it */ 758 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); 759 if (!dev) 760 return retval; 761 762 mutex_init(&dev->mutex); 763 764 atomic_set(&dev->intr_idx, 0); 765 atomic_set(&dev->read_idx, 0); 766 spin_lock_init(&dev->intr_idx_lock); 767 atomic_set(&dev->overflow_flag, 0); 768 init_waitqueue_head(&dev->read_wait); 769 atomic_set(&dev->write_busy, 0); 770 init_waitqueue_head(&dev->write_wait); 771 772 dev->udev = udev; 773 dev->interface = interface; 774 775 iface_desc = interface->cur_altsetting; 776 dev->product_id = le16_to_cpu(udev->descriptor.idProduct); 777 778 res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint); 779 if (res) { 780 dev_err(&interface->dev, "no interrupt-in endpoint found\n"); 781 retval = res; 782 goto error; 783 } 784 785 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) { 786 res = usb_find_last_int_out_endpoint(iface_desc, 787 &dev->int_out_endpoint); 788 if (res) { 789 dev_err(&interface->dev, "no interrupt-out endpoint found\n"); 790 retval = res; 791 goto error; 792 } 793 } 794 795 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */ 796 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); 797 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && 798 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) 799 /* IOWarrior56 has wMaxPacketSize different from report size */ 800 dev->report_size = 7; 801 802 /* create the urb and buffer for reading */ 803 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); 804 if (!dev->int_in_urb) 805 goto error; 806 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); 807 if (!dev->int_in_buffer) 808 goto error; 809 usb_fill_int_urb(dev->int_in_urb, dev->udev, 810 usb_rcvintpipe(dev->udev, 811 dev->int_in_endpoint->bEndpointAddress), 812 dev->int_in_buffer, dev->report_size, 813 iowarrior_callback, dev, 814 dev->int_in_endpoint->bInterval); 815 /* create an internal buffer for interrupt data from the device */ 816 dev->read_queue = 817 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER), 818 GFP_KERNEL); 819 if (!dev->read_queue) 820 goto error; 821 /* Get the serial-number of the chip */ 822 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 823 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, 824 sizeof(dev->chip_serial)); 825 if (strlen(dev->chip_serial) != 8) 826 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 827 828 /* Set the idle timeout to 0, if this is interface 0 */ 829 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { 830 usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 831 0x0A, 832 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 833 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 834 } 835 /* allow device read and ioctl */ 836 dev->present = 1; 837 838 /* we can register the device now, as it is ready */ 839 usb_set_intfdata(interface, dev); 840 841 retval = usb_register_dev(interface, &iowarrior_class); 842 if (retval) { 843 /* something prevented us from registering this driver */ 844 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 845 usb_set_intfdata(interface, NULL); 846 goto error; 847 } 848 849 dev->minor = interface->minor; 850 851 /* let the user know what node this device is now attached to */ 852 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " 853 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, 854 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); 855 return retval; 856 857 error: 858 iowarrior_delete(dev); 859 return retval; 860 } 861 862 /** 863 * iowarrior_disconnect 864 * 865 * Called by the usb core when the device is removed from the system. 866 */ 867 static void iowarrior_disconnect(struct usb_interface *interface) 868 { 869 struct iowarrior *dev; 870 int minor; 871 872 dev = usb_get_intfdata(interface); 873 mutex_lock(&iowarrior_open_disc_lock); 874 usb_set_intfdata(interface, NULL); 875 876 minor = dev->minor; 877 878 /* give back our minor */ 879 usb_deregister_dev(interface, &iowarrior_class); 880 881 mutex_lock(&dev->mutex); 882 883 /* prevent device read, write and ioctl */ 884 dev->present = 0; 885 886 mutex_unlock(&dev->mutex); 887 mutex_unlock(&iowarrior_open_disc_lock); 888 889 if (dev->opened) { 890 /* There is a process that holds a filedescriptor to the device , 891 so we only shutdown read-/write-ops going on. 892 Deleting the device is postponed until close() was called. 893 */ 894 usb_kill_urb(dev->int_in_urb); 895 wake_up_interruptible(&dev->read_wait); 896 wake_up_interruptible(&dev->write_wait); 897 } else { 898 /* no process is using the device, cleanup now */ 899 iowarrior_delete(dev); 900 } 901 902 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", 903 minor - IOWARRIOR_MINOR_BASE); 904 } 905 906 /* usb specific object needed to register this driver with the usb subsystem */ 907 static struct usb_driver iowarrior_driver = { 908 .name = "iowarrior", 909 .probe = iowarrior_probe, 910 .disconnect = iowarrior_disconnect, 911 .id_table = iowarrior_ids, 912 }; 913 914 module_usb_driver(iowarrior_driver); 915