1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * VMEbus User access driver 4 * 5 * Author: Martyn Welch <martyn.welch@ge.com> 6 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. 7 * 8 * Based on work by: 9 * Tom Armistead and Ajit Prem 10 * Copyright 2004 Motorola Inc. 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/refcount.h> 16 #include <linux/cdev.h> 17 #include <linux/delay.h> 18 #include <linux/device.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/errno.h> 21 #include <linux/init.h> 22 #include <linux/ioctl.h> 23 #include <linux/kernel.h> 24 #include <linux/mm.h> 25 #include <linux/module.h> 26 #include <linux/pagemap.h> 27 #include <linux/pci.h> 28 #include <linux/mutex.h> 29 #include <linux/slab.h> 30 #include <linux/spinlock.h> 31 #include <linux/syscalls.h> 32 #include <linux/types.h> 33 34 #include <linux/io.h> 35 #include <linux/uaccess.h> 36 37 #include "vme.h" 38 #include "vme_user.h" 39 40 static const char driver_name[] = "vme_user"; 41 42 static int bus[VME_USER_BUS_MAX]; 43 static unsigned int bus_num; 44 45 /* Currently Documentation/admin-guide/devices.rst defines the 46 * following for VME: 47 * 48 * 221 char VME bus 49 * 0 = /dev/bus/vme/m0 First master image 50 * 1 = /dev/bus/vme/m1 Second master image 51 * 2 = /dev/bus/vme/m2 Third master image 52 * 3 = /dev/bus/vme/m3 Fourth master image 53 * 4 = /dev/bus/vme/s0 First slave image 54 * 5 = /dev/bus/vme/s1 Second slave image 55 * 6 = /dev/bus/vme/s2 Third slave image 56 * 7 = /dev/bus/vme/s3 Fourth slave image 57 * 8 = /dev/bus/vme/ctl Control 58 * 59 * It is expected that all VME bus drivers will use the 60 * same interface. For interface documentation see 61 * http://www.vmelinux.org/. 62 * 63 * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't 64 * even support the tsi148 chipset (which has 8 master and 8 slave windows). 65 * We'll run with this for now as far as possible, however it probably makes 66 * sense to get rid of the old mappings and just do everything dynamically. 67 * 68 * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as 69 * defined above and try to support at least some of the interface from 70 * http://www.vmelinux.org/ as an alternative the driver can be written 71 * providing a saner interface later. 72 * 73 * The vmelinux.org driver never supported slave images, the devices reserved 74 * for slaves were repurposed to support all 8 master images on the UniverseII! 75 * We shall support 4 masters and 4 slaves with this driver. 76 */ 77 #define VME_MAJOR 221 /* VME Major Device Number */ 78 #define VME_DEVS 9 /* Number of dev entries */ 79 80 #define MASTER_MINOR 0 81 #define MASTER_MAX 3 82 #define SLAVE_MINOR 4 83 #define SLAVE_MAX 7 84 #define CONTROL_MINOR 8 85 86 #define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */ 87 88 /* 89 * Structure to handle image related parameters. 90 */ 91 struct image_desc { 92 void *kern_buf; /* Buffer address in kernel space */ 93 dma_addr_t pci_buf; /* Buffer address in PCI address space */ 94 unsigned long long size_buf; /* Buffer size */ 95 struct mutex mutex; /* Mutex for locking image */ 96 struct device *device; /* Sysfs device */ 97 struct vme_resource *resource; /* VME resource */ 98 int mmap_count; /* Number of current mmap's */ 99 }; 100 101 static struct image_desc image[VME_DEVS]; 102 103 static struct cdev *vme_user_cdev; /* Character device */ 104 static struct class *vme_user_sysfs_class; /* Sysfs class */ 105 static struct vme_dev *vme_user_bridge; /* Pointer to user device */ 106 107 static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR, 108 MASTER_MINOR, MASTER_MINOR, 109 SLAVE_MINOR, SLAVE_MINOR, 110 SLAVE_MINOR, SLAVE_MINOR, 111 CONTROL_MINOR 112 }; 113 114 struct vme_user_vma_priv { 115 unsigned int minor; 116 refcount_t refcnt; 117 }; 118 119 static ssize_t resource_to_user(int minor, char __user *buf, size_t count, 120 loff_t *ppos) 121 { 122 ssize_t copied = 0; 123 124 if (count > image[minor].size_buf) 125 count = image[minor].size_buf; 126 127 copied = vme_master_read(image[minor].resource, image[minor].kern_buf, 128 count, *ppos); 129 if (copied < 0) 130 return (int)copied; 131 132 if (copy_to_user(buf, image[minor].kern_buf, (unsigned long)copied)) 133 return -EFAULT; 134 135 return copied; 136 } 137 138 static ssize_t resource_from_user(unsigned int minor, const char __user *buf, 139 size_t count, loff_t *ppos) 140 { 141 if (count > image[minor].size_buf) 142 count = image[minor].size_buf; 143 144 if (copy_from_user(image[minor].kern_buf, buf, (unsigned long)count)) 145 return -EFAULT; 146 147 return vme_master_write(image[minor].resource, image[minor].kern_buf, 148 count, *ppos); 149 } 150 151 static ssize_t buffer_to_user(unsigned int minor, char __user *buf, 152 size_t count, loff_t *ppos) 153 { 154 void *image_ptr; 155 156 image_ptr = image[minor].kern_buf + *ppos; 157 if (copy_to_user(buf, image_ptr, (unsigned long)count)) 158 return -EFAULT; 159 160 return count; 161 } 162 163 static ssize_t buffer_from_user(unsigned int minor, const char __user *buf, 164 size_t count, loff_t *ppos) 165 { 166 void *image_ptr; 167 168 image_ptr = image[minor].kern_buf + *ppos; 169 if (copy_from_user(image_ptr, buf, (unsigned long)count)) 170 return -EFAULT; 171 172 return count; 173 } 174 175 static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count, 176 loff_t *ppos) 177 { 178 unsigned int minor = iminor(file_inode(file)); 179 ssize_t retval; 180 size_t image_size; 181 182 if (minor == CONTROL_MINOR) 183 return 0; 184 185 mutex_lock(&image[minor].mutex); 186 187 /* XXX Do we *really* want this helper - we can use vme_*_get ? */ 188 image_size = vme_get_size(image[minor].resource); 189 190 /* Ensure we are starting at a valid location */ 191 if ((*ppos < 0) || (*ppos > (image_size - 1))) { 192 mutex_unlock(&image[minor].mutex); 193 return 0; 194 } 195 196 /* Ensure not reading past end of the image */ 197 if (*ppos + count > image_size) 198 count = image_size - *ppos; 199 200 switch (type[minor]) { 201 case MASTER_MINOR: 202 retval = resource_to_user(minor, buf, count, ppos); 203 break; 204 case SLAVE_MINOR: 205 retval = buffer_to_user(minor, buf, count, ppos); 206 break; 207 default: 208 retval = -EINVAL; 209 } 210 211 mutex_unlock(&image[minor].mutex); 212 if (retval > 0) 213 *ppos += retval; 214 215 return retval; 216 } 217 218 static ssize_t vme_user_write(struct file *file, const char __user *buf, 219 size_t count, loff_t *ppos) 220 { 221 unsigned int minor = iminor(file_inode(file)); 222 ssize_t retval; 223 size_t image_size; 224 225 if (minor == CONTROL_MINOR) 226 return 0; 227 228 mutex_lock(&image[minor].mutex); 229 230 image_size = vme_get_size(image[minor].resource); 231 232 /* Ensure we are starting at a valid location */ 233 if ((*ppos < 0) || (*ppos > (image_size - 1))) { 234 mutex_unlock(&image[minor].mutex); 235 return 0; 236 } 237 238 /* Ensure not reading past end of the image */ 239 if (*ppos + count > image_size) 240 count = image_size - *ppos; 241 242 switch (type[minor]) { 243 case MASTER_MINOR: 244 retval = resource_from_user(minor, buf, count, ppos); 245 break; 246 case SLAVE_MINOR: 247 retval = buffer_from_user(minor, buf, count, ppos); 248 break; 249 default: 250 retval = -EINVAL; 251 } 252 253 mutex_unlock(&image[minor].mutex); 254 255 if (retval > 0) 256 *ppos += retval; 257 258 return retval; 259 } 260 261 static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) 262 { 263 unsigned int minor = iminor(file_inode(file)); 264 size_t image_size; 265 loff_t res; 266 267 switch (type[minor]) { 268 case MASTER_MINOR: 269 case SLAVE_MINOR: 270 mutex_lock(&image[minor].mutex); 271 image_size = vme_get_size(image[minor].resource); 272 res = fixed_size_llseek(file, off, whence, image_size); 273 mutex_unlock(&image[minor].mutex); 274 return res; 275 } 276 277 return -EINVAL; 278 } 279 280 /* 281 * The ioctls provided by the old VME access method (the one at vmelinux.org) 282 * are most certainly wrong as the effectively push the registers layout 283 * through to user space. Given that the VME core can handle multiple bridges, 284 * with different register layouts this is most certainly not the way to go. 285 * 286 * We aren't using the structures defined in the Motorola driver either - these 287 * are also quite low level, however we should use the definitions that have 288 * already been defined. 289 */ 290 static int vme_user_ioctl(struct inode *inode, struct file *file, 291 unsigned int cmd, unsigned long arg) 292 { 293 struct vme_master master; 294 struct vme_slave slave; 295 struct vme_irq_id irq_req; 296 unsigned long copied; 297 unsigned int minor = iminor(inode); 298 int retval; 299 dma_addr_t pci_addr; 300 void __user *argp = (void __user *)arg; 301 302 switch (type[minor]) { 303 case CONTROL_MINOR: 304 switch (cmd) { 305 case VME_IRQ_GEN: 306 copied = copy_from_user(&irq_req, argp, 307 sizeof(irq_req)); 308 if (copied) { 309 pr_warn("Partial copy from userspace\n"); 310 return -EFAULT; 311 } 312 313 return vme_irq_generate(vme_user_bridge, 314 irq_req.level, 315 irq_req.statid); 316 } 317 break; 318 case MASTER_MINOR: 319 switch (cmd) { 320 case VME_GET_MASTER: 321 memset(&master, 0, sizeof(master)); 322 323 /* XXX We do not want to push aspace, cycle and width 324 * to userspace as they are 325 */ 326 retval = vme_master_get(image[minor].resource, 327 &master.enable, 328 &master.vme_addr, 329 &master.size, &master.aspace, 330 &master.cycle, &master.dwidth); 331 332 copied = copy_to_user(argp, &master, 333 sizeof(master)); 334 if (copied) { 335 pr_warn("Partial copy to userspace\n"); 336 return -EFAULT; 337 } 338 339 return retval; 340 341 case VME_SET_MASTER: 342 343 if (image[minor].mmap_count != 0) { 344 pr_warn("Can't adjust mapped window\n"); 345 return -EPERM; 346 } 347 348 copied = copy_from_user(&master, argp, sizeof(master)); 349 if (copied) { 350 pr_warn("Partial copy from userspace\n"); 351 return -EFAULT; 352 } 353 354 /* XXX We do not want to push aspace, cycle and width 355 * to userspace as they are 356 */ 357 return vme_master_set(image[minor].resource, 358 master.enable, master.vme_addr, master.size, 359 master.aspace, master.cycle, master.dwidth); 360 361 break; 362 } 363 break; 364 case SLAVE_MINOR: 365 switch (cmd) { 366 case VME_GET_SLAVE: 367 memset(&slave, 0, sizeof(slave)); 368 369 /* XXX We do not want to push aspace, cycle and width 370 * to userspace as they are 371 */ 372 retval = vme_slave_get(image[minor].resource, 373 &slave.enable, &slave.vme_addr, 374 &slave.size, &pci_addr, 375 &slave.aspace, &slave.cycle); 376 377 copied = copy_to_user(argp, &slave, 378 sizeof(slave)); 379 if (copied) { 380 pr_warn("Partial copy to userspace\n"); 381 return -EFAULT; 382 } 383 384 return retval; 385 386 case VME_SET_SLAVE: 387 388 copied = copy_from_user(&slave, argp, sizeof(slave)); 389 if (copied) { 390 pr_warn("Partial copy from userspace\n"); 391 return -EFAULT; 392 } 393 394 /* XXX We do not want to push aspace, cycle and width 395 * to userspace as they are 396 */ 397 return vme_slave_set(image[minor].resource, 398 slave.enable, slave.vme_addr, slave.size, 399 image[minor].pci_buf, slave.aspace, 400 slave.cycle); 401 402 break; 403 } 404 break; 405 } 406 407 return -EINVAL; 408 } 409 410 static long 411 vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 412 { 413 int ret; 414 struct inode *inode = file_inode(file); 415 unsigned int minor = iminor(inode); 416 417 mutex_lock(&image[minor].mutex); 418 ret = vme_user_ioctl(inode, file, cmd, arg); 419 mutex_unlock(&image[minor].mutex); 420 421 return ret; 422 } 423 424 static void vme_user_vm_open(struct vm_area_struct *vma) 425 { 426 struct vme_user_vma_priv *vma_priv = vma->vm_private_data; 427 428 refcount_inc(&vma_priv->refcnt); 429 } 430 431 static void vme_user_vm_close(struct vm_area_struct *vma) 432 { 433 struct vme_user_vma_priv *vma_priv = vma->vm_private_data; 434 unsigned int minor = vma_priv->minor; 435 436 if (!refcount_dec_and_test(&vma_priv->refcnt)) 437 return; 438 439 mutex_lock(&image[minor].mutex); 440 image[minor].mmap_count--; 441 mutex_unlock(&image[minor].mutex); 442 443 kfree(vma_priv); 444 } 445 446 static const struct vm_operations_struct vme_user_vm_ops = { 447 .open = vme_user_vm_open, 448 .close = vme_user_vm_close, 449 }; 450 451 static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma) 452 { 453 int err; 454 struct vme_user_vma_priv *vma_priv; 455 456 mutex_lock(&image[minor].mutex); 457 458 err = vme_master_mmap(image[minor].resource, vma); 459 if (err) { 460 mutex_unlock(&image[minor].mutex); 461 return err; 462 } 463 464 vma_priv = kmalloc(sizeof(*vma_priv), GFP_KERNEL); 465 if (!vma_priv) { 466 mutex_unlock(&image[minor].mutex); 467 return -ENOMEM; 468 } 469 470 vma_priv->minor = minor; 471 refcount_set(&vma_priv->refcnt, 1); 472 vma->vm_ops = &vme_user_vm_ops; 473 vma->vm_private_data = vma_priv; 474 475 image[minor].mmap_count++; 476 477 mutex_unlock(&image[minor].mutex); 478 479 return 0; 480 } 481 482 static int vme_user_mmap(struct file *file, struct vm_area_struct *vma) 483 { 484 unsigned int minor = iminor(file_inode(file)); 485 486 if (type[minor] == MASTER_MINOR) 487 return vme_user_master_mmap(minor, vma); 488 489 return -ENODEV; 490 } 491 492 static const struct file_operations vme_user_fops = { 493 .read = vme_user_read, 494 .write = vme_user_write, 495 .llseek = vme_user_llseek, 496 .unlocked_ioctl = vme_user_unlocked_ioctl, 497 .compat_ioctl = compat_ptr_ioctl, 498 .mmap = vme_user_mmap, 499 }; 500 501 static int vme_user_match(struct vme_dev *vdev) 502 { 503 int i; 504 505 int cur_bus = vme_bus_num(vdev); 506 int cur_slot = vme_slot_num(vdev); 507 508 for (i = 0; i < bus_num; i++) 509 if ((cur_bus == bus[i]) && (cur_slot == vdev->num)) 510 return 1; 511 512 return 0; 513 } 514 515 /* 516 * In this simple access driver, the old behaviour is being preserved as much 517 * as practical. We will therefore reserve the buffers and request the images 518 * here so that we don't have to do it later. 519 */ 520 static int vme_user_probe(struct vme_dev *vdev) 521 { 522 int i, err; 523 char *name; 524 525 /* Save pointer to the bridge device */ 526 if (vme_user_bridge) { 527 dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n"); 528 err = -EINVAL; 529 goto err_dev; 530 } 531 vme_user_bridge = vdev; 532 533 /* Initialise descriptors */ 534 for (i = 0; i < VME_DEVS; i++) { 535 image[i].kern_buf = NULL; 536 image[i].pci_buf = 0; 537 mutex_init(&image[i].mutex); 538 image[i].device = NULL; 539 image[i].resource = NULL; 540 } 541 542 /* Assign major and minor numbers for the driver */ 543 err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, 544 driver_name); 545 if (err) { 546 dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n", 547 VME_MAJOR); 548 goto err_region; 549 } 550 551 /* Register the driver as a char device */ 552 vme_user_cdev = cdev_alloc(); 553 if (!vme_user_cdev) { 554 err = -ENOMEM; 555 goto err_char; 556 } 557 vme_user_cdev->ops = &vme_user_fops; 558 vme_user_cdev->owner = THIS_MODULE; 559 err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); 560 if (err) 561 goto err_class; 562 563 /* Request slave resources and allocate buffers (128kB wide) */ 564 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { 565 /* XXX Need to properly request attributes */ 566 /* For ca91cx42 bridge there are only two slave windows 567 * supporting A16 addressing, so we request A24 supported 568 * by all windows. 569 */ 570 image[i].resource = vme_slave_request(vme_user_bridge, 571 VME_A24, VME_SCT); 572 if (!image[i].resource) { 573 dev_warn(&vdev->dev, 574 "Unable to allocate slave resource\n"); 575 err = -ENOMEM; 576 goto err_slave; 577 } 578 image[i].size_buf = PCI_BUF_SIZE; 579 image[i].kern_buf = vme_alloc_consistent(image[i].resource, 580 image[i].size_buf, 581 &image[i].pci_buf); 582 if (!image[i].kern_buf) { 583 dev_warn(&vdev->dev, 584 "Unable to allocate memory for buffer\n"); 585 image[i].pci_buf = 0; 586 vme_slave_free(image[i].resource); 587 err = -ENOMEM; 588 goto err_slave; 589 } 590 } 591 592 /* 593 * Request master resources allocate page sized buffers for small 594 * reads and writes 595 */ 596 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { 597 /* XXX Need to properly request attributes */ 598 image[i].resource = vme_master_request(vme_user_bridge, 599 VME_A32, VME_SCT, 600 VME_D32); 601 if (!image[i].resource) { 602 dev_warn(&vdev->dev, 603 "Unable to allocate master resource\n"); 604 err = -ENOMEM; 605 goto err_master; 606 } 607 image[i].size_buf = PCI_BUF_SIZE; 608 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); 609 if (!image[i].kern_buf) { 610 err = -ENOMEM; 611 vme_master_free(image[i].resource); 612 goto err_master; 613 } 614 } 615 616 /* Create sysfs entries - on udev systems this creates the dev files */ 617 vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); 618 if (IS_ERR(vme_user_sysfs_class)) { 619 dev_err(&vdev->dev, "Error creating vme_user class.\n"); 620 err = PTR_ERR(vme_user_sysfs_class); 621 goto err_master; 622 } 623 624 /* Add sysfs Entries */ 625 for (i = 0; i < VME_DEVS; i++) { 626 int num; 627 628 switch (type[i]) { 629 case MASTER_MINOR: 630 name = "bus/vme/m%d"; 631 break; 632 case CONTROL_MINOR: 633 name = "bus/vme/ctl"; 634 break; 635 case SLAVE_MINOR: 636 name = "bus/vme/s%d"; 637 break; 638 default: 639 err = -EINVAL; 640 goto err_sysfs; 641 } 642 643 num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i; 644 image[i].device = device_create(vme_user_sysfs_class, NULL, 645 MKDEV(VME_MAJOR, i), NULL, 646 name, num); 647 if (IS_ERR(image[i].device)) { 648 dev_info(&vdev->dev, "Error creating sysfs device\n"); 649 err = PTR_ERR(image[i].device); 650 goto err_sysfs; 651 } 652 } 653 654 return 0; 655 656 err_sysfs: 657 while (i > 0) { 658 i--; 659 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); 660 } 661 class_destroy(vme_user_sysfs_class); 662 663 /* Ensure counter set correctly to unalloc all master windows */ 664 i = MASTER_MAX + 1; 665 err_master: 666 while (i > MASTER_MINOR) { 667 i--; 668 kfree(image[i].kern_buf); 669 vme_master_free(image[i].resource); 670 } 671 672 /* 673 * Ensure counter set correctly to unalloc all slave windows and buffers 674 */ 675 i = SLAVE_MAX + 1; 676 err_slave: 677 while (i > SLAVE_MINOR) { 678 i--; 679 vme_free_consistent(image[i].resource, image[i].size_buf, 680 image[i].kern_buf, image[i].pci_buf); 681 vme_slave_free(image[i].resource); 682 } 683 err_class: 684 cdev_del(vme_user_cdev); 685 err_char: 686 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); 687 err_region: 688 err_dev: 689 return err; 690 } 691 692 static void vme_user_remove(struct vme_dev *dev) 693 { 694 int i; 695 696 /* Remove sysfs Entries */ 697 for (i = 0; i < VME_DEVS; i++) { 698 mutex_destroy(&image[i].mutex); 699 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); 700 } 701 class_destroy(vme_user_sysfs_class); 702 703 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { 704 kfree(image[i].kern_buf); 705 vme_master_free(image[i].resource); 706 } 707 708 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { 709 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); 710 vme_free_consistent(image[i].resource, image[i].size_buf, 711 image[i].kern_buf, image[i].pci_buf); 712 vme_slave_free(image[i].resource); 713 } 714 715 /* Unregister device driver */ 716 cdev_del(vme_user_cdev); 717 718 /* Unregister the major and minor device numbers */ 719 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); 720 } 721 722 static struct vme_driver vme_user_driver = { 723 .name = driver_name, 724 .match = vme_user_match, 725 .probe = vme_user_probe, 726 .remove = vme_user_remove, 727 }; 728 729 static int __init vme_user_init(void) 730 { 731 int retval = 0; 732 733 pr_info("VME User Space Access Driver\n"); 734 735 if (bus_num == 0) { 736 pr_err("No cards, skipping registration\n"); 737 retval = -ENODEV; 738 goto err_nocard; 739 } 740 741 /* Let's start by supporting one bus, we can support more than one 742 * in future revisions if that ever becomes necessary. 743 */ 744 if (bus_num > VME_USER_BUS_MAX) { 745 pr_err("Driver only able to handle %d buses\n", 746 VME_USER_BUS_MAX); 747 bus_num = VME_USER_BUS_MAX; 748 } 749 750 /* 751 * Here we just register the maximum number of devices we can and 752 * leave vme_user_match() to allow only 1 to go through to probe(). 753 * This way, if we later want to allow multiple user access devices, 754 * we just change the code in vme_user_match(). 755 */ 756 retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); 757 if (retval) 758 goto err_reg; 759 760 return retval; 761 762 err_reg: 763 err_nocard: 764 return retval; 765 } 766 767 static void __exit vme_user_exit(void) 768 { 769 vme_unregister_driver(&vme_user_driver); 770 } 771 772 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); 773 module_param_array(bus, int, &bus_num, 0000); 774 775 MODULE_DESCRIPTION("VME User Space Access Driver"); 776 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>"); 777 MODULE_LICENSE("GPL"); 778 779 module_init(vme_user_init); 780 module_exit(vme_user_exit); 781