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/init.h> 19 #include <linux/slab.h> 20 #include <linux/sched.h> 21 #include <linux/mutex.h> 22 #include <linux/poll.h> 23 #include <linux/usb/iowarrior.h> 24 25 /* Version Information */ 26 #define DRIVER_VERSION "v0.4.0" 27 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" 28 #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)" 29 30 #define USB_VENDOR_ID_CODEMERCS 1984 31 /* low speed iowarrior */ 32 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 33 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 34 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 35 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 36 /* full speed iowarrior */ 37 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 38 39 /* Get a minor range for your devices from the usb maintainer */ 40 #ifdef CONFIG_USB_DYNAMIC_MINORS 41 #define IOWARRIOR_MINOR_BASE 0 42 #else 43 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not offical yet 44 #endif 45 46 /* interrupt input queue size */ 47 #define MAX_INTERRUPT_BUFFER 16 48 /* 49 maximum number of urbs that are submitted for writes at the same time, 50 this applies to the IOWarrior56 only! 51 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. 52 */ 53 #define MAX_WRITES_IN_FLIGHT 4 54 55 /* Use our own dbg macro */ 56 #undef dbg 57 #define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 ) 58 59 MODULE_AUTHOR(DRIVER_AUTHOR); 60 MODULE_DESCRIPTION(DRIVER_DESC); 61 MODULE_LICENSE("GPL"); 62 63 /* Module parameters */ 64 static DEFINE_MUTEX(iowarrior_mutex); 65 static int debug = 0; 66 module_param(debug, bool, 0644); 67 MODULE_PARM_DESC(debug, "debug=1 enables debugging messages"); 68 69 static struct usb_driver iowarrior_driver; 70 static DEFINE_MUTEX(iowarrior_open_disc_lock); 71 72 /*--------------*/ 73 /* data */ 74 /*--------------*/ 75 76 /* Structure to hold all of our device specific stuff */ 77 struct iowarrior { 78 struct mutex mutex; /* locks this structure */ 79 struct usb_device *udev; /* save off the usb device pointer */ 80 struct usb_interface *interface; /* the interface for this device */ 81 unsigned char minor; /* the starting minor number for this device */ 82 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ 83 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ 84 struct urb *int_in_urb; /* the urb for reading data */ 85 unsigned char *int_in_buffer; /* buffer for data to be read */ 86 unsigned char serial_number; /* to detect lost packages */ 87 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ 88 wait_queue_head_t read_wait; 89 wait_queue_head_t write_wait; /* wait-queue for writing to the device */ 90 atomic_t write_busy; /* number of write-urbs submitted */ 91 atomic_t read_idx; 92 atomic_t intr_idx; 93 spinlock_t intr_idx_lock; /* protects intr_idx */ 94 atomic_t overflow_flag; /* signals an index 'rollover' */ 95 int present; /* this is 1 as long as the device is connected */ 96 int opened; /* this is 1 if the device is currently open */ 97 char chip_serial[9]; /* the serial number string of the chip connected */ 98 int report_size; /* number of bytes in a report */ 99 u16 product_id; 100 }; 101 102 /*--------------*/ 103 /* globals */ 104 /*--------------*/ 105 106 /* 107 * USB spec identifies 5 second timeouts. 108 */ 109 #define GET_TIMEOUT 5 110 #define USB_REQ_GET_REPORT 0x01 111 //#if 0 112 static int usb_get_report(struct usb_device *dev, 113 struct usb_host_interface *inter, unsigned char type, 114 unsigned char id, void *buf, int size) 115 { 116 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 117 USB_REQ_GET_REPORT, 118 USB_DIR_IN | USB_TYPE_CLASS | 119 USB_RECIP_INTERFACE, (type << 8) + id, 120 inter->desc.bInterfaceNumber, buf, size, 121 GET_TIMEOUT*HZ); 122 } 123 //#endif 124 125 #define USB_REQ_SET_REPORT 0x09 126 127 static int usb_set_report(struct usb_interface *intf, unsigned char type, 128 unsigned char id, void *buf, int size) 129 { 130 return usb_control_msg(interface_to_usbdev(intf), 131 usb_sndctrlpipe(interface_to_usbdev(intf), 0), 132 USB_REQ_SET_REPORT, 133 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 134 (type << 8) + id, 135 intf->cur_altsetting->desc.bInterfaceNumber, buf, 136 size, HZ); 137 } 138 139 /*---------------------*/ 140 /* driver registration */ 141 /*---------------------*/ 142 /* table of devices that work with this driver */ 143 static const struct usb_device_id iowarrior_ids[] = { 144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, 145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, 146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, 147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, 148 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, 149 {} /* Terminating entry */ 150 }; 151 MODULE_DEVICE_TABLE(usb, iowarrior_ids); 152 153 /* 154 * USB callback handler for reading data 155 */ 156 static void iowarrior_callback(struct urb *urb) 157 { 158 struct iowarrior *dev = urb->context; 159 int intr_idx; 160 int read_idx; 161 int aux_idx; 162 int offset; 163 int status = urb->status; 164 int retval; 165 166 switch (status) { 167 case 0: 168 /* success */ 169 break; 170 case -ECONNRESET: 171 case -ENOENT: 172 case -ESHUTDOWN: 173 return; 174 default: 175 goto exit; 176 } 177 178 spin_lock(&dev->intr_idx_lock); 179 intr_idx = atomic_read(&dev->intr_idx); 180 /* aux_idx become previous intr_idx */ 181 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); 182 read_idx = atomic_read(&dev->read_idx); 183 184 /* queue is not empty and it's interface 0 */ 185 if ((intr_idx != read_idx) 186 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { 187 /* + 1 for serial number */ 188 offset = aux_idx * (dev->report_size + 1); 189 if (!memcmp 190 (dev->read_queue + offset, urb->transfer_buffer, 191 dev->report_size)) { 192 /* equal values on interface 0 will be ignored */ 193 spin_unlock(&dev->intr_idx_lock); 194 goto exit; 195 } 196 } 197 198 /* aux_idx become next intr_idx */ 199 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); 200 if (read_idx == aux_idx) { 201 /* queue full, dropping oldest input */ 202 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; 203 atomic_set(&dev->read_idx, read_idx); 204 atomic_set(&dev->overflow_flag, 1); 205 } 206 207 /* +1 for serial number */ 208 offset = intr_idx * (dev->report_size + 1); 209 memcpy(dev->read_queue + offset, urb->transfer_buffer, 210 dev->report_size); 211 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; 212 213 atomic_set(&dev->intr_idx, aux_idx); 214 spin_unlock(&dev->intr_idx_lock); 215 /* tell the blocking read about the new data */ 216 wake_up_interruptible(&dev->read_wait); 217 218 exit: 219 retval = usb_submit_urb(urb, GFP_ATOMIC); 220 if (retval) 221 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", 222 __func__, retval); 223 224 } 225 226 /* 227 * USB Callback handler for write-ops 228 */ 229 static void iowarrior_write_callback(struct urb *urb) 230 { 231 struct iowarrior *dev; 232 int status = urb->status; 233 234 dev = urb->context; 235 /* sync/async unlink faults aren't errors */ 236 if (status && 237 !(status == -ENOENT || 238 status == -ECONNRESET || status == -ESHUTDOWN)) { 239 dbg("%s - nonzero write bulk status received: %d", 240 __func__, status); 241 } 242 /* free up our allocated buffer */ 243 usb_free_coherent(urb->dev, urb->transfer_buffer_length, 244 urb->transfer_buffer, urb->transfer_dma); 245 /* tell a waiting writer the interrupt-out-pipe is available again */ 246 atomic_dec(&dev->write_busy); 247 wake_up_interruptible(&dev->write_wait); 248 } 249 250 /** 251 * iowarrior_delete 252 */ 253 static inline void iowarrior_delete(struct iowarrior *dev) 254 { 255 dbg("%s - minor %d", __func__, dev->minor); 256 kfree(dev->int_in_buffer); 257 usb_free_urb(dev->int_in_urb); 258 kfree(dev->read_queue); 259 kfree(dev); 260 } 261 262 /*---------------------*/ 263 /* fops implementation */ 264 /*---------------------*/ 265 266 static int read_index(struct iowarrior *dev) 267 { 268 int intr_idx, read_idx; 269 270 read_idx = atomic_read(&dev->read_idx); 271 intr_idx = atomic_read(&dev->intr_idx); 272 273 return (read_idx == intr_idx ? -1 : read_idx); 274 } 275 276 /** 277 * iowarrior_read 278 */ 279 static ssize_t iowarrior_read(struct file *file, char __user *buffer, 280 size_t count, loff_t *ppos) 281 { 282 struct iowarrior *dev; 283 int read_idx; 284 int offset; 285 286 dev = file->private_data; 287 288 /* verify that the device wasn't unplugged */ 289 if (dev == NULL || !dev->present) 290 return -ENODEV; 291 292 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count); 293 294 /* read count must be packet size (+ time stamp) */ 295 if ((count != dev->report_size) 296 && (count != (dev->report_size + 1))) 297 return -EINVAL; 298 299 /* repeat until no buffer overrun in callback handler occur */ 300 do { 301 atomic_set(&dev->overflow_flag, 0); 302 if ((read_idx = read_index(dev)) == -1) { 303 /* queue emty */ 304 if (file->f_flags & O_NONBLOCK) 305 return -EAGAIN; 306 else { 307 //next line will return when there is either new data, or the device is unplugged 308 int r = wait_event_interruptible(dev->read_wait, 309 (!dev->present 310 || (read_idx = 311 read_index 312 (dev)) != 313 -1)); 314 if (r) { 315 //we were interrupted by a signal 316 return -ERESTART; 317 } 318 if (!dev->present) { 319 //The device was unplugged 320 return -ENODEV; 321 } 322 if (read_idx == -1) { 323 // Can this happen ??? 324 return 0; 325 } 326 } 327 } 328 329 offset = read_idx * (dev->report_size + 1); 330 if (copy_to_user(buffer, dev->read_queue + offset, count)) { 331 return -EFAULT; 332 } 333 } while (atomic_read(&dev->overflow_flag)); 334 335 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; 336 atomic_set(&dev->read_idx, read_idx); 337 return count; 338 } 339 340 /* 341 * iowarrior_write 342 */ 343 static ssize_t iowarrior_write(struct file *file, 344 const char __user *user_buffer, 345 size_t count, loff_t *ppos) 346 { 347 struct iowarrior *dev; 348 int retval = 0; 349 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ 350 struct urb *int_out_urb = NULL; 351 352 dev = file->private_data; 353 354 mutex_lock(&dev->mutex); 355 /* verify that the device wasn't unplugged */ 356 if (!dev->present) { 357 retval = -ENODEV; 358 goto exit; 359 } 360 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count); 361 /* if count is 0 we're already done */ 362 if (count == 0) { 363 retval = 0; 364 goto exit; 365 } 366 /* We only accept full reports */ 367 if (count != dev->report_size) { 368 retval = -EINVAL; 369 goto exit; 370 } 371 switch (dev->product_id) { 372 case USB_DEVICE_ID_CODEMERCS_IOW24: 373 case USB_DEVICE_ID_CODEMERCS_IOWPV1: 374 case USB_DEVICE_ID_CODEMERCS_IOWPV2: 375 case USB_DEVICE_ID_CODEMERCS_IOW40: 376 /* IOW24 and IOW40 use a synchronous call */ 377 buf = kmalloc(8, GFP_KERNEL); /* 8 bytes are enough for both products */ 378 if (!buf) { 379 retval = -ENOMEM; 380 goto exit; 381 } 382 if (copy_from_user(buf, user_buffer, count)) { 383 retval = -EFAULT; 384 kfree(buf); 385 goto exit; 386 } 387 retval = usb_set_report(dev->interface, 2, 0, buf, count); 388 kfree(buf); 389 goto exit; 390 break; 391 case USB_DEVICE_ID_CODEMERCS_IOW56: 392 /* The IOW56 uses asynchronous IO and more urbs */ 393 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { 394 /* Wait until we are below the limit for submitted urbs */ 395 if (file->f_flags & O_NONBLOCK) { 396 retval = -EAGAIN; 397 goto exit; 398 } else { 399 retval = wait_event_interruptible(dev->write_wait, 400 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); 401 if (retval) { 402 /* we were interrupted by a signal */ 403 retval = -ERESTART; 404 goto exit; 405 } 406 if (!dev->present) { 407 /* The device was unplugged */ 408 retval = -ENODEV; 409 goto exit; 410 } 411 if (!dev->opened) { 412 /* We were closed while waiting for an URB */ 413 retval = -ENODEV; 414 goto exit; 415 } 416 } 417 } 418 atomic_inc(&dev->write_busy); 419 int_out_urb = usb_alloc_urb(0, GFP_KERNEL); 420 if (!int_out_urb) { 421 retval = -ENOMEM; 422 dbg("%s Unable to allocate urb ", __func__); 423 goto error_no_urb; 424 } 425 buf = usb_alloc_coherent(dev->udev, dev->report_size, 426 GFP_KERNEL, &int_out_urb->transfer_dma); 427 if (!buf) { 428 retval = -ENOMEM; 429 dbg("%s Unable to allocate buffer ", __func__); 430 goto error_no_buffer; 431 } 432 usb_fill_int_urb(int_out_urb, dev->udev, 433 usb_sndintpipe(dev->udev, 434 dev->int_out_endpoint->bEndpointAddress), 435 buf, dev->report_size, 436 iowarrior_write_callback, dev, 437 dev->int_out_endpoint->bInterval); 438 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 439 if (copy_from_user(buf, user_buffer, count)) { 440 retval = -EFAULT; 441 goto error; 442 } 443 retval = usb_submit_urb(int_out_urb, GFP_KERNEL); 444 if (retval) { 445 dbg("%s submit error %d for urb nr.%d", __func__, 446 retval, atomic_read(&dev->write_busy)); 447 goto error; 448 } 449 /* submit was ok */ 450 retval = count; 451 usb_free_urb(int_out_urb); 452 goto exit; 453 break; 454 default: 455 /* what do we have here ? An unsupported Product-ID ? */ 456 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", 457 __func__, dev->product_id); 458 retval = -EFAULT; 459 goto exit; 460 break; 461 } 462 error: 463 usb_free_coherent(dev->udev, dev->report_size, buf, 464 int_out_urb->transfer_dma); 465 error_no_buffer: 466 usb_free_urb(int_out_urb); 467 error_no_urb: 468 atomic_dec(&dev->write_busy); 469 wake_up_interruptible(&dev->write_wait); 470 exit: 471 mutex_unlock(&dev->mutex); 472 return retval; 473 } 474 475 /** 476 * iowarrior_ioctl 477 */ 478 static long iowarrior_ioctl(struct file *file, unsigned int cmd, 479 unsigned long arg) 480 { 481 struct iowarrior *dev = NULL; 482 __u8 *buffer; 483 __u8 __user *user_buffer; 484 int retval; 485 int io_res; /* checks for bytes read/written and copy_to/from_user results */ 486 487 dev = file->private_data; 488 if (dev == NULL) { 489 return -ENODEV; 490 } 491 492 buffer = kzalloc(dev->report_size, GFP_KERNEL); 493 if (!buffer) 494 return -ENOMEM; 495 496 /* lock this object */ 497 mutex_lock(&iowarrior_mutex); 498 mutex_lock(&dev->mutex); 499 500 /* verify that the device wasn't unplugged */ 501 if (!dev->present) { 502 retval = -ENODEV; 503 goto error_out; 504 } 505 506 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd, 507 arg); 508 509 retval = 0; 510 io_res = 0; 511 switch (cmd) { 512 case IOW_WRITE: 513 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || 514 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || 515 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || 516 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { 517 user_buffer = (__u8 __user *)arg; 518 io_res = copy_from_user(buffer, user_buffer, 519 dev->report_size); 520 if (io_res) { 521 retval = -EFAULT; 522 } else { 523 io_res = usb_set_report(dev->interface, 2, 0, 524 buffer, 525 dev->report_size); 526 if (io_res < 0) 527 retval = io_res; 528 } 529 } else { 530 retval = -EINVAL; 531 dev_err(&dev->interface->dev, 532 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", 533 dev->product_id); 534 } 535 break; 536 case IOW_READ: 537 user_buffer = (__u8 __user *)arg; 538 io_res = usb_get_report(dev->udev, 539 dev->interface->cur_altsetting, 1, 0, 540 buffer, dev->report_size); 541 if (io_res < 0) 542 retval = io_res; 543 else { 544 io_res = copy_to_user(user_buffer, buffer, dev->report_size); 545 if (io_res < 0) 546 retval = -EFAULT; 547 } 548 break; 549 case IOW_GETINFO: 550 { 551 /* Report available information for the device */ 552 struct iowarrior_info info; 553 /* needed for power consumption */ 554 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; 555 556 /* directly from the descriptor */ 557 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); 558 info.product = dev->product_id; 559 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); 560 561 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ 562 info.speed = le16_to_cpu(dev->udev->speed); 563 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; 564 info.report_size = dev->report_size; 565 566 /* serial number string has been read earlier 8 chars or empty string */ 567 memcpy(info.serial, dev->chip_serial, 568 sizeof(dev->chip_serial)); 569 if (cfg_descriptor == NULL) { 570 info.power = -1; /* no information available */ 571 } else { 572 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ 573 info.power = cfg_descriptor->bMaxPower * 2; 574 } 575 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, 576 sizeof(struct iowarrior_info)); 577 if (io_res < 0) 578 retval = -EFAULT; 579 break; 580 } 581 default: 582 /* return that we did not understand this ioctl call */ 583 retval = -ENOTTY; 584 break; 585 } 586 error_out: 587 /* unlock the device */ 588 mutex_unlock(&dev->mutex); 589 mutex_unlock(&iowarrior_mutex); 590 kfree(buffer); 591 return retval; 592 } 593 594 /** 595 * iowarrior_open 596 */ 597 static int iowarrior_open(struct inode *inode, struct file *file) 598 { 599 struct iowarrior *dev = NULL; 600 struct usb_interface *interface; 601 int subminor; 602 int retval = 0; 603 604 dbg("%s", __func__); 605 606 mutex_lock(&iowarrior_mutex); 607 subminor = iminor(inode); 608 609 interface = usb_find_interface(&iowarrior_driver, subminor); 610 if (!interface) { 611 mutex_unlock(&iowarrior_mutex); 612 err("%s - error, can't find device for minor %d", __func__, 613 subminor); 614 return -ENODEV; 615 } 616 617 mutex_lock(&iowarrior_open_disc_lock); 618 dev = usb_get_intfdata(interface); 619 if (!dev) { 620 mutex_unlock(&iowarrior_open_disc_lock); 621 mutex_unlock(&iowarrior_mutex); 622 return -ENODEV; 623 } 624 625 mutex_lock(&dev->mutex); 626 mutex_unlock(&iowarrior_open_disc_lock); 627 628 /* Only one process can open each device, no sharing. */ 629 if (dev->opened) { 630 retval = -EBUSY; 631 goto out; 632 } 633 634 /* setup interrupt handler for receiving values */ 635 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { 636 dev_err(&interface->dev, "Error %d while submitting URB\n", retval); 637 retval = -EFAULT; 638 goto out; 639 } 640 /* increment our usage count for the driver */ 641 ++dev->opened; 642 /* save our object in the file's private structure */ 643 file->private_data = dev; 644 retval = 0; 645 646 out: 647 mutex_unlock(&dev->mutex); 648 mutex_unlock(&iowarrior_mutex); 649 return retval; 650 } 651 652 /** 653 * iowarrior_release 654 */ 655 static int iowarrior_release(struct inode *inode, struct file *file) 656 { 657 struct iowarrior *dev; 658 int retval = 0; 659 660 dev = file->private_data; 661 if (dev == NULL) { 662 return -ENODEV; 663 } 664 665 dbg("%s - minor %d", __func__, dev->minor); 666 667 /* lock our device */ 668 mutex_lock(&dev->mutex); 669 670 if (dev->opened <= 0) { 671 retval = -ENODEV; /* close called more than once */ 672 mutex_unlock(&dev->mutex); 673 } else { 674 dev->opened = 0; /* we're closeing now */ 675 retval = 0; 676 if (dev->present) { 677 /* 678 The device is still connected so we only shutdown 679 pending read-/write-ops. 680 */ 681 usb_kill_urb(dev->int_in_urb); 682 wake_up_interruptible(&dev->read_wait); 683 wake_up_interruptible(&dev->write_wait); 684 mutex_unlock(&dev->mutex); 685 } else { 686 /* The device was unplugged, cleanup resources */ 687 mutex_unlock(&dev->mutex); 688 iowarrior_delete(dev); 689 } 690 } 691 return retval; 692 } 693 694 static unsigned iowarrior_poll(struct file *file, poll_table * wait) 695 { 696 struct iowarrior *dev = file->private_data; 697 unsigned int mask = 0; 698 699 if (!dev->present) 700 return POLLERR | POLLHUP; 701 702 poll_wait(file, &dev->read_wait, wait); 703 poll_wait(file, &dev->write_wait, wait); 704 705 if (!dev->present) 706 return POLLERR | POLLHUP; 707 708 if (read_index(dev) != -1) 709 mask |= POLLIN | POLLRDNORM; 710 711 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) 712 mask |= POLLOUT | POLLWRNORM; 713 return mask; 714 } 715 716 /* 717 * File operations needed when we register this driver. 718 * This assumes that this driver NEEDS file operations, 719 * of course, which means that the driver is expected 720 * to have a node in the /dev directory. If the USB 721 * device were for a network interface then the driver 722 * would use "struct net_driver" instead, and a serial 723 * device would use "struct tty_driver". 724 */ 725 static const struct file_operations iowarrior_fops = { 726 .owner = THIS_MODULE, 727 .write = iowarrior_write, 728 .read = iowarrior_read, 729 .unlocked_ioctl = iowarrior_ioctl, 730 .open = iowarrior_open, 731 .release = iowarrior_release, 732 .poll = iowarrior_poll, 733 }; 734 735 static char *iowarrior_devnode(struct device *dev, mode_t *mode) 736 { 737 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 738 } 739 740 /* 741 * usb class driver info in order to get a minor number from the usb core, 742 * and to have the device registered with devfs and the driver core 743 */ 744 static struct usb_class_driver iowarrior_class = { 745 .name = "iowarrior%d", 746 .devnode = iowarrior_devnode, 747 .fops = &iowarrior_fops, 748 .minor_base = IOWARRIOR_MINOR_BASE, 749 }; 750 751 /*---------------------------------*/ 752 /* probe and disconnect functions */ 753 /*---------------------------------*/ 754 /** 755 * iowarrior_probe 756 * 757 * Called by the usb core when a new device is connected that it thinks 758 * this driver might be interested in. 759 */ 760 static int iowarrior_probe(struct usb_interface *interface, 761 const struct usb_device_id *id) 762 { 763 struct usb_device *udev = interface_to_usbdev(interface); 764 struct iowarrior *dev = NULL; 765 struct usb_host_interface *iface_desc; 766 struct usb_endpoint_descriptor *endpoint; 767 int i; 768 int retval = -ENOMEM; 769 770 /* allocate memory for our device state and intialize it */ 771 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); 772 if (dev == NULL) { 773 dev_err(&interface->dev, "Out of memory\n"); 774 return retval; 775 } 776 777 mutex_init(&dev->mutex); 778 779 atomic_set(&dev->intr_idx, 0); 780 atomic_set(&dev->read_idx, 0); 781 spin_lock_init(&dev->intr_idx_lock); 782 atomic_set(&dev->overflow_flag, 0); 783 init_waitqueue_head(&dev->read_wait); 784 atomic_set(&dev->write_busy, 0); 785 init_waitqueue_head(&dev->write_wait); 786 787 dev->udev = udev; 788 dev->interface = interface; 789 790 iface_desc = interface->cur_altsetting; 791 dev->product_id = le16_to_cpu(udev->descriptor.idProduct); 792 793 /* set up the endpoint information */ 794 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 795 endpoint = &iface_desc->endpoint[i].desc; 796 797 if (usb_endpoint_is_int_in(endpoint)) 798 dev->int_in_endpoint = endpoint; 799 if (usb_endpoint_is_int_out(endpoint)) 800 /* this one will match for the IOWarrior56 only */ 801 dev->int_out_endpoint = endpoint; 802 } 803 /* we have to check the report_size often, so remember it in the endianess suitable for our machine */ 804 dev->report_size = le16_to_cpu(dev->int_in_endpoint->wMaxPacketSize); 805 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && 806 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) 807 /* IOWarrior56 has wMaxPacketSize different from report size */ 808 dev->report_size = 7; 809 810 /* create the urb and buffer for reading */ 811 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); 812 if (!dev->int_in_urb) { 813 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); 814 goto error; 815 } 816 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); 817 if (!dev->int_in_buffer) { 818 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n"); 819 goto error; 820 } 821 usb_fill_int_urb(dev->int_in_urb, dev->udev, 822 usb_rcvintpipe(dev->udev, 823 dev->int_in_endpoint->bEndpointAddress), 824 dev->int_in_buffer, dev->report_size, 825 iowarrior_callback, dev, 826 dev->int_in_endpoint->bInterval); 827 /* create an internal buffer for interrupt data from the device */ 828 dev->read_queue = 829 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER), 830 GFP_KERNEL); 831 if (!dev->read_queue) { 832 dev_err(&interface->dev, "Couldn't allocate read_queue\n"); 833 goto error; 834 } 835 /* Get the serial-number of the chip */ 836 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 837 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, 838 sizeof(dev->chip_serial)); 839 if (strlen(dev->chip_serial) != 8) 840 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 841 842 /* Set the idle timeout to 0, if this is interface 0 */ 843 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { 844 usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 845 0x0A, 846 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 847 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 848 } 849 /* allow device read and ioctl */ 850 dev->present = 1; 851 852 /* we can register the device now, as it is ready */ 853 usb_set_intfdata(interface, dev); 854 855 retval = usb_register_dev(interface, &iowarrior_class); 856 if (retval) { 857 /* something prevented us from registering this driver */ 858 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 859 usb_set_intfdata(interface, NULL); 860 goto error; 861 } 862 863 dev->minor = interface->minor; 864 865 /* let the user know what node this device is now attached to */ 866 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " 867 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, 868 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); 869 return retval; 870 871 error: 872 iowarrior_delete(dev); 873 return retval; 874 } 875 876 /** 877 * iowarrior_disconnect 878 * 879 * Called by the usb core when the device is removed from the system. 880 */ 881 static void iowarrior_disconnect(struct usb_interface *interface) 882 { 883 struct iowarrior *dev; 884 int minor; 885 886 dev = usb_get_intfdata(interface); 887 mutex_lock(&iowarrior_open_disc_lock); 888 usb_set_intfdata(interface, NULL); 889 890 minor = dev->minor; 891 892 /* give back our minor */ 893 usb_deregister_dev(interface, &iowarrior_class); 894 895 mutex_lock(&dev->mutex); 896 897 /* prevent device read, write and ioctl */ 898 dev->present = 0; 899 900 mutex_unlock(&dev->mutex); 901 mutex_unlock(&iowarrior_open_disc_lock); 902 903 if (dev->opened) { 904 /* There is a process that holds a filedescriptor to the device , 905 so we only shutdown read-/write-ops going on. 906 Deleting the device is postponed until close() was called. 907 */ 908 usb_kill_urb(dev->int_in_urb); 909 wake_up_interruptible(&dev->read_wait); 910 wake_up_interruptible(&dev->write_wait); 911 } else { 912 /* no process is using the device, cleanup now */ 913 iowarrior_delete(dev); 914 } 915 916 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", 917 minor - IOWARRIOR_MINOR_BASE); 918 } 919 920 /* usb specific object needed to register this driver with the usb subsystem */ 921 static struct usb_driver iowarrior_driver = { 922 .name = "iowarrior", 923 .probe = iowarrior_probe, 924 .disconnect = iowarrior_disconnect, 925 .id_table = iowarrior_ids, 926 }; 927 928 static int __init iowarrior_init(void) 929 { 930 return usb_register(&iowarrior_driver); 931 } 932 933 static void __exit iowarrior_exit(void) 934 { 935 usb_deregister(&iowarrior_driver); 936 } 937 938 module_init(iowarrior_init); 939 module_exit(iowarrior_exit); 940