1/* 2 * VMEbus User access driver 3 * 4 * Author: Martyn Welch <martyn.welch@ge.com> 5 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. 6 * 7 * Based on work by: 8 * Tom Armistead and Ajit Prem 9 * Copyright 2004 Motorola Inc. 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms of the GNU General Public License as published by the 14 * Free Software Foundation; either version 2 of the License, or (at your 15 * option) any later version. 16 */ 17 18#include <linux/cdev.h> 19#include <linux/delay.h> 20#include <linux/device.h> 21#include <linux/dma-mapping.h> 22#include <linux/errno.h> 23#include <linux/init.h> 24#include <linux/ioctl.h> 25#include <linux/kernel.h> 26#include <linux/mm.h> 27#include <linux/module.h> 28#include <linux/pagemap.h> 29#include <linux/pci.h> 30#include <linux/semaphore.h> 31#include <linux/slab.h> 32#include <linux/spinlock.h> 33#include <linux/syscalls.h> 34#include <linux/mutex.h> 35#include <linux/types.h> 36 37#include <linux/io.h> 38#include <linux/uaccess.h> 39 40#include "../vme.h" 41#include "vme_user.h" 42 43static DEFINE_MUTEX(vme_user_mutex); 44static char driver_name[] = "vme_user"; 45 46static int bus[USER_BUS_MAX]; 47static int bus_num; 48 49/* Currently Documentation/devices.txt defines the following for VME: 50 * 51 * 221 char VME bus 52 * 0 = /dev/bus/vme/m0 First master image 53 * 1 = /dev/bus/vme/m1 Second master image 54 * 2 = /dev/bus/vme/m2 Third master image 55 * 3 = /dev/bus/vme/m3 Fourth master image 56 * 4 = /dev/bus/vme/s0 First slave image 57 * 5 = /dev/bus/vme/s1 Second slave image 58 * 6 = /dev/bus/vme/s2 Third slave image 59 * 7 = /dev/bus/vme/s3 Fourth slave image 60 * 8 = /dev/bus/vme/ctl Control 61 * 62 * It is expected that all VME bus drivers will use the 63 * same interface. For interface documentation see 64 * http://www.vmelinux.org/. 65 * 66 * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't 67 * even support the tsi148 chipset (which has 8 master and 8 slave windows). 68 * We'll run with this or now as far as possible, however it probably makes 69 * sense to get rid of the old mappings and just do everything dynamically. 70 * 71 * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as 72 * defined above and try to support at least some of the interface from 73 * http://www.vmelinux.org/ as an alternative drive can be written providing a 74 * saner interface later. 75 * 76 * The vmelinux.org driver never supported slave images, the devices reserved 77 * for slaves were repurposed to support all 8 master images on the UniverseII! 78 * We shall support 4 masters and 4 slaves with this driver. 79 */ 80#define VME_MAJOR 221 /* VME Major Device Number */ 81#define VME_DEVS 9 /* Number of dev entries */ 82 83#define MASTER_MINOR 0 84#define MASTER_MAX 3 85#define SLAVE_MINOR 4 86#define SLAVE_MAX 7 87#define CONTROL_MINOR 8 88 89#define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */ 90 91/* 92 * Structure to handle image related parameters. 93 */ 94typedef struct { 95 void __iomem *kern_buf; /* Buffer address in kernel space */ 96 dma_addr_t pci_buf; /* Buffer address in PCI address space */ 97 unsigned long long size_buf; /* Buffer size */ 98 struct semaphore sem; /* Semaphore for locking image */ 99 struct device *device; /* Sysfs device */ 100 struct vme_resource *resource; /* VME resource */ 101 int users; /* Number of current users */ 102} image_desc_t; 103static image_desc_t image[VME_DEVS]; 104 105typedef struct { 106 unsigned long reads; 107 unsigned long writes; 108 unsigned long ioctls; 109 unsigned long irqs; 110 unsigned long berrs; 111 unsigned long dmaErrors; 112 unsigned long timeouts; 113 unsigned long external; 114} driver_stats_t; 115static driver_stats_t statistics; 116 117struct cdev *vme_user_cdev; /* Character device */ 118struct class *vme_user_sysfs_class; /* Sysfs class */ 119struct device *vme_user_bridge; /* Pointer to the bridge device */ 120 121 122static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR, 123 MASTER_MINOR, MASTER_MINOR, 124 SLAVE_MINOR, SLAVE_MINOR, 125 SLAVE_MINOR, SLAVE_MINOR, 126 CONTROL_MINOR 127 }; 128 129 130static int vme_user_open(struct inode *, struct file *); 131static int vme_user_release(struct inode *, struct file *); 132static ssize_t vme_user_read(struct file *, char *, size_t, loff_t *); 133static ssize_t vme_user_write(struct file *, const char *, size_t, loff_t *); 134static loff_t vme_user_llseek(struct file *, loff_t, int); 135static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long); 136 137static int __init vme_user_probe(struct device *, int, int); 138static int __exit vme_user_remove(struct device *, int, int); 139 140static struct file_operations vme_user_fops = { 141 .open = vme_user_open, 142 .release = vme_user_release, 143 .read = vme_user_read, 144 .write = vme_user_write, 145 .llseek = vme_user_llseek, 146 .unlocked_ioctl = vme_user_unlocked_ioctl, 147}; 148 149 150/* 151 * Reset all the statistic counters 152 */ 153static void reset_counters(void) 154{ 155 statistics.reads = 0; 156 statistics.writes = 0; 157 statistics.ioctls = 0; 158 statistics.irqs = 0; 159 statistics.berrs = 0; 160 statistics.dmaErrors = 0; 161 statistics.timeouts = 0; 162} 163 164static int vme_user_open(struct inode *inode, struct file *file) 165{ 166 int err; 167 unsigned int minor = MINOR(inode->i_rdev); 168 169 down(&image[minor].sem); 170 /* Only allow device to be opened if a resource is allocated */ 171 if (image[minor].resource == NULL) { 172 printk(KERN_ERR "No resources allocated for device\n"); 173 err = -EINVAL; 174 goto err_res; 175 } 176 177 /* Increment user count */ 178 image[minor].users++; 179 180 up(&image[minor].sem); 181 182 return 0; 183 184err_res: 185 up(&image[minor].sem); 186 187 return err; 188} 189 190static int vme_user_release(struct inode *inode, struct file *file) 191{ 192 unsigned int minor = MINOR(inode->i_rdev); 193 194 down(&image[minor].sem); 195 196 /* Decrement user count */ 197 image[minor].users--; 198 199 up(&image[minor].sem); 200 201 return 0; 202} 203 204/* 205 * We are going ot alloc a page during init per window for small transfers. 206 * Small transfers will go VME -> buffer -> user space. Larger (more than a 207 * page) transfers will lock the user space buffer into memory and then 208 * transfer the data directly into the user space buffers. 209 */ 210static ssize_t resource_to_user(int minor, char __user *buf, size_t count, 211 loff_t *ppos) 212{ 213 ssize_t retval; 214 ssize_t copied = 0; 215 216 if (count <= image[minor].size_buf) { 217 /* We copy to kernel buffer */ 218 copied = vme_master_read(image[minor].resource, 219 image[minor].kern_buf, count, *ppos); 220 if (copied < 0) 221 return (int)copied; 222 223 retval = __copy_to_user(buf, image[minor].kern_buf, 224 (unsigned long)copied); 225 if (retval != 0) { 226 copied = (copied - retval); 227 printk(KERN_INFO "User copy failed\n"); 228 return -EINVAL; 229 } 230 231 } else { 232 printk(KERN_INFO "Currently don't support large transfers\n"); 233 /* Map in pages from userspace */ 234 235 /* Call vme_master_read to do the transfer */ 236 return -EINVAL; 237 } 238 239 return copied; 240} 241 242/* 243 * We are going ot alloc a page during init per window for small transfers. 244 * Small transfers will go user space -> buffer -> VME. Larger (more than a 245 * page) transfers will lock the user space buffer into memory and then 246 * transfer the data directly from the user space buffers out to VME. 247 */ 248static ssize_t resource_from_user(unsigned int minor, const char *buf, 249 size_t count, loff_t *ppos) 250{ 251 ssize_t retval; 252 ssize_t copied = 0; 253 254 if (count <= image[minor].size_buf) { 255 retval = __copy_from_user(image[minor].kern_buf, buf, 256 (unsigned long)count); 257 if (retval != 0) 258 copied = (copied - retval); 259 else 260 copied = count; 261 262 copied = vme_master_write(image[minor].resource, 263 image[minor].kern_buf, copied, *ppos); 264 } else { 265 printk(KERN_INFO "Currently don't support large transfers\n"); 266 /* Map in pages from userspace */ 267 268 /* Call vme_master_write to do the transfer */ 269 return -EINVAL; 270 } 271 272 return copied; 273} 274 275static ssize_t buffer_to_user(unsigned int minor, char __user *buf, 276 size_t count, loff_t *ppos) 277{ 278 void __iomem *image_ptr; 279 ssize_t retval; 280 281 image_ptr = image[minor].kern_buf + *ppos; 282 283 retval = __copy_to_user(buf, image_ptr, (unsigned long)count); 284 if (retval != 0) { 285 retval = (count - retval); 286 printk(KERN_WARNING "Partial copy to userspace\n"); 287 } else 288 retval = count; 289 290 /* Return number of bytes successfully read */ 291 return retval; 292} 293 294static ssize_t buffer_from_user(unsigned int minor, const char *buf, 295 size_t count, loff_t *ppos) 296{ 297 void __iomem *image_ptr; 298 size_t retval; 299 300 image_ptr = image[minor].kern_buf + *ppos; 301 302 retval = __copy_from_user(image_ptr, buf, (unsigned long)count); 303 if (retval != 0) { 304 retval = (count - retval); 305 printk(KERN_WARNING "Partial copy to userspace\n"); 306 } else 307 retval = count; 308 309 /* Return number of bytes successfully read */ 310 return retval; 311} 312 313static ssize_t vme_user_read(struct file *file, char *buf, size_t count, 314 loff_t *ppos) 315{ 316 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); 317 ssize_t retval; 318 size_t image_size; 319 size_t okcount; 320 321 down(&image[minor].sem); 322 323 image_size = vme_get_size(image[minor].resource); 324 325 /* Ensure we are starting at a valid location */ 326 if ((*ppos < 0) || (*ppos > (image_size - 1))) { 327 up(&image[minor].sem); 328 return 0; 329 } 330 331 /* Ensure not reading past end of the image */ 332 if (*ppos + count > image_size) 333 okcount = image_size - *ppos; 334 else 335 okcount = count; 336 337 switch (type[minor]) { 338 case MASTER_MINOR: 339 retval = resource_to_user(minor, buf, okcount, ppos); 340 break; 341 case SLAVE_MINOR: 342 retval = buffer_to_user(minor, buf, okcount, ppos); 343 break; 344 default: 345 retval = -EINVAL; 346 } 347 348 up(&image[minor].sem); 349 350 if (retval > 0) 351 *ppos += retval; 352 353 return retval; 354} 355 356static ssize_t vme_user_write(struct file *file, const char *buf, size_t count, 357 loff_t *ppos) 358{ 359 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); 360 ssize_t retval; 361 size_t image_size; 362 size_t okcount; 363 364 down(&image[minor].sem); 365 366 image_size = vme_get_size(image[minor].resource); 367 368 /* Ensure we are starting at a valid location */ 369 if ((*ppos < 0) || (*ppos > (image_size - 1))) { 370 up(&image[minor].sem); 371 return 0; 372 } 373 374 /* Ensure not reading past end of the image */ 375 if (*ppos + count > image_size) 376 okcount = image_size - *ppos; 377 else 378 okcount = count; 379 380 switch (type[minor]) { 381 case MASTER_MINOR: 382 retval = resource_from_user(minor, buf, okcount, ppos); 383 break; 384 case SLAVE_MINOR: 385 retval = buffer_from_user(minor, buf, okcount, ppos); 386 break; 387 default: 388 retval = -EINVAL; 389 } 390 391 up(&image[minor].sem); 392 393 if (retval > 0) 394 *ppos += retval; 395 396 return retval; 397} 398 399static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) 400{ 401 loff_t absolute = -1; 402 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); 403 size_t image_size; 404 405 down(&image[minor].sem); 406 image_size = vme_get_size(image[minor].resource); 407 408 switch (whence) { 409 case SEEK_SET: 410 absolute = off; 411 break; 412 case SEEK_CUR: 413 absolute = file->f_pos + off; 414 break; 415 case SEEK_END: 416 absolute = image_size + off; 417 break; 418 default: 419 up(&image[minor].sem); 420 return -EINVAL; 421 break; 422 } 423 424 if ((absolute < 0) || (absolute >= image_size)) { 425 up(&image[minor].sem); 426 return -EINVAL; 427 } 428 429 file->f_pos = absolute; 430 431 up(&image[minor].sem); 432 433 return absolute; 434} 435 436/* 437 * The ioctls provided by the old VME access method (the one at vmelinux.org) 438 * are most certainly wrong as the effectively push the registers layout 439 * through to user space. Given that the VME core can handle multiple bridges, 440 * with different register layouts this is most certainly not the way to go. 441 * 442 * We aren't using the structures defined in the Motorola driver either - these 443 * are also quite low level, however we should use the definitions that have 444 * already been defined. 445 */ 446static int vme_user_ioctl(struct inode *inode, struct file *file, 447 unsigned int cmd, unsigned long arg) 448{ 449 struct vme_master master; 450 struct vme_slave slave; 451 unsigned long copied; 452 unsigned int minor = MINOR(inode->i_rdev); 453 int retval; 454 dma_addr_t pci_addr; 455 456 statistics.ioctls++; 457 458 switch (type[minor]) { 459 case CONTROL_MINOR: 460 break; 461 case MASTER_MINOR: 462 switch (cmd) { 463 case VME_GET_MASTER: 464 memset(&master, 0, sizeof(struct vme_master)); 465 466 retval = vme_master_get(image[minor].resource, 467 &(master.enable), &(master.vme_addr), 468 &(master.size), &(master.aspace), 469 &(master.cycle), &(master.dwidth)); 470 471 copied = copy_to_user((char *)arg, &master, 472 sizeof(struct vme_master)); 473 if (copied != 0) { 474 printk(KERN_WARNING "Partial copy to " 475 "userspace\n"); 476 return -EFAULT; 477 } 478 479 return retval; 480 break; 481 482 case VME_SET_MASTER: 483 484 copied = copy_from_user(&master, (char *)arg, 485 sizeof(master)); 486 if (copied != 0) { 487 printk(KERN_WARNING "Partial copy from " 488 "userspace\n"); 489 return -EFAULT; 490 } 491 492 return vme_master_set(image[minor].resource, 493 master.enable, master.vme_addr, master.size, 494 master.aspace, master.cycle, master.dwidth); 495 496 break; 497 } 498 break; 499 case SLAVE_MINOR: 500 switch (cmd) { 501 case VME_GET_SLAVE: 502 memset(&slave, 0, sizeof(struct vme_slave)); 503 504 retval = vme_slave_get(image[minor].resource, 505 &(slave.enable), &(slave.vme_addr), 506 &(slave.size), &pci_addr, &(slave.aspace), 507 &(slave.cycle)); 508 509 copied = copy_to_user((char *)arg, &slave, 510 sizeof(struct vme_slave)); 511 if (copied != 0) { 512 printk(KERN_WARNING "Partial copy to " 513 "userspace\n"); 514 return -EFAULT; 515 } 516 517 return retval; 518 break; 519 520 case VME_SET_SLAVE: 521 522 copied = copy_from_user(&slave, (char *)arg, 523 sizeof(slave)); 524 if (copied != 0) { 525 printk(KERN_WARNING "Partial copy from " 526 "userspace\n"); 527 return -EFAULT; 528 } 529 530 return vme_slave_set(image[minor].resource, 531 slave.enable, slave.vme_addr, slave.size, 532 image[minor].pci_buf, slave.aspace, 533 slave.cycle); 534 535 break; 536 } 537 break; 538 } 539 540 return -EINVAL; 541} 542 543static long 544vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 545{ 546 int ret; 547 548 mutex_lock(&vme_user_mutex); 549 ret = vme_user_ioctl(file->f_path.dentry->d_inode, file, cmd, arg); 550 mutex_unlock(&vme_user_mutex); 551 552 return ret; 553} 554 555 556/* 557 * Unallocate a previously allocated buffer 558 */ 559static void buf_unalloc(int num) 560{ 561 if (image[num].kern_buf) { 562#ifdef VME_DEBUG 563 printk(KERN_DEBUG "UniverseII:Releasing buffer at %p\n", 564 image[num].pci_buf); 565#endif 566 567 vme_free_consistent(image[num].resource, image[num].size_buf, 568 image[num].kern_buf, image[num].pci_buf); 569 570 image[num].kern_buf = NULL; 571 image[num].pci_buf = 0; 572 image[num].size_buf = 0; 573 574#ifdef VME_DEBUG 575 } else { 576 printk(KERN_DEBUG "UniverseII: Buffer not allocated\n"); 577#endif 578 } 579} 580 581static struct vme_driver vme_user_driver = { 582 .name = driver_name, 583 .probe = vme_user_probe, 584 .remove = vme_user_remove, 585}; 586 587 588static int __init vme_user_init(void) 589{ 590 int retval = 0; 591 int i; 592 struct vme_device_id *ids; 593 594 printk(KERN_INFO "VME User Space Access Driver\n"); 595 596 if (bus_num == 0) { 597 printk(KERN_ERR "%s: No cards, skipping registration\n", 598 driver_name); 599 goto err_nocard; 600 } 601 602 /* Let's start by supporting one bus, we can support more than one 603 * in future revisions if that ever becomes necessary. 604 */ 605 if (bus_num > USER_BUS_MAX) { 606 printk(KERN_ERR "%s: Driver only able to handle %d buses\n", 607 driver_name, USER_BUS_MAX); 608 bus_num = USER_BUS_MAX; 609 } 610 611 612 /* Dynamically create the bind table based on module parameters */ 613 ids = kmalloc(sizeof(struct vme_device_id) * (bus_num + 1), GFP_KERNEL); 614 if (ids == NULL) { 615 printk(KERN_ERR "%s: Unable to allocate ID table\n", 616 driver_name); 617 goto err_id; 618 } 619 620 memset(ids, 0, (sizeof(struct vme_device_id) * (bus_num + 1))); 621 622 for (i = 0; i < bus_num; i++) { 623 ids[i].bus = bus[i]; 624 /* 625 * We register the driver against the slot occupied by *this* 626 * card, since it's really a low level way of controlling 627 * the VME bridge 628 */ 629 ids[i].slot = VME_SLOT_CURRENT; 630 } 631 632 vme_user_driver.bind_table = ids; 633 634 retval = vme_register_driver(&vme_user_driver); 635 if (retval != 0) 636 goto err_reg; 637 638 return retval; 639 640 vme_unregister_driver(&vme_user_driver); 641err_reg: 642 kfree(ids); 643err_id: 644err_nocard: 645 return retval; 646} 647 648/* 649 * In this simple access driver, the old behaviour is being preserved as much 650 * as practical. We will therefore reserve the buffers and request the images 651 * here so that we don't have to do it later. 652 */ 653static int __init vme_user_probe(struct device *dev, int cur_bus, int cur_slot) 654{ 655 int i, err; 656 char name[12]; 657 658 /* Save pointer to the bridge device */ 659 if (vme_user_bridge != NULL) { 660 printk(KERN_ERR "%s: Driver can only be loaded for 1 device\n", 661 driver_name); 662 err = -EINVAL; 663 goto err_dev; 664 } 665 vme_user_bridge = dev; 666 667 /* Initialise descriptors */ 668 for (i = 0; i < VME_DEVS; i++) { 669 image[i].kern_buf = NULL; 670 image[i].pci_buf = 0; 671 init_MUTEX(&(image[i].sem)); 672 image[i].device = NULL; 673 image[i].resource = NULL; 674 image[i].users = 0; 675 } 676 677 /* Initialise statistics counters */ 678 reset_counters(); 679 680 /* Assign major and minor numbers for the driver */ 681 err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, 682 driver_name); 683 if (err) { 684 printk(KERN_WARNING "%s: Error getting Major Number %d for " 685 "driver.\n", driver_name, VME_MAJOR); 686 goto err_region; 687 } 688 689 /* Register the driver as a char device */ 690 vme_user_cdev = cdev_alloc(); 691 vme_user_cdev->ops = &vme_user_fops; 692 vme_user_cdev->owner = THIS_MODULE; 693 err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); 694 if (err) { 695 printk(KERN_WARNING "%s: cdev_all failed\n", driver_name); 696 goto err_char; 697 } 698 699 /* Request slave resources and allocate buffers (128kB wide) */ 700 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { 701 /* For ca91cx42 bridge there are only two slave windows 702 * supporting A16 addressing, so we request A24 supported 703 * by all windows. 704 */ 705 image[i].resource = vme_slave_request(vme_user_bridge, 706 VME_A24, VME_SCT); 707 if (image[i].resource == NULL) { 708 printk(KERN_WARNING "Unable to allocate slave " 709 "resource\n"); 710 goto err_slave; 711 } 712 image[i].size_buf = PCI_BUF_SIZE; 713 image[i].kern_buf = vme_alloc_consistent(image[i].resource, 714 image[i].size_buf, &(image[i].pci_buf)); 715 if (image[i].kern_buf == NULL) { 716 printk(KERN_WARNING "Unable to allocate memory for " 717 "buffer\n"); 718 image[i].pci_buf = 0; 719 vme_slave_free(image[i].resource); 720 err = -ENOMEM; 721 goto err_slave; 722 } 723 } 724 725 /* 726 * Request master resources allocate page sized buffers for small 727 * reads and writes 728 */ 729 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { 730 image[i].resource = vme_master_request(vme_user_bridge, 731 VME_A32, VME_SCT, VME_D32); 732 if (image[i].resource == NULL) { 733 printk(KERN_WARNING "Unable to allocate master " 734 "resource\n"); 735 goto err_master; 736 } 737 image[i].size_buf = PCI_BUF_SIZE; 738 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); 739 if (image[i].kern_buf == NULL) { 740 printk(KERN_WARNING "Unable to allocate memory for " 741 "master window buffers\n"); 742 err = -ENOMEM; 743 goto err_master_buf; 744 } 745 } 746 747 /* Create sysfs entries - on udev systems this creates the dev files */ 748 vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); 749 if (IS_ERR(vme_user_sysfs_class)) { 750 printk(KERN_ERR "Error creating vme_user class.\n"); 751 err = PTR_ERR(vme_user_sysfs_class); 752 goto err_class; 753 } 754 755 /* Add sysfs Entries */ 756 for (i = 0; i < VME_DEVS; i++) { 757 switch (type[i]) { 758 case MASTER_MINOR: 759 sprintf(name, "bus/vme/m%%d"); 760 break; 761 case CONTROL_MINOR: 762 sprintf(name, "bus/vme/ctl"); 763 break; 764 case SLAVE_MINOR: 765 sprintf(name, "bus/vme/s%%d"); 766 break; 767 default: 768 err = -EINVAL; 769 goto err_sysfs; 770 break; 771 } 772 773 image[i].device = 774 device_create(vme_user_sysfs_class, NULL, 775 MKDEV(VME_MAJOR, i), NULL, name, 776 (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i); 777 if (IS_ERR(image[i].device)) { 778 printk(KERN_INFO "%s: Error creating sysfs device\n", 779 driver_name); 780 err = PTR_ERR(image[i].device); 781 goto err_sysfs; 782 } 783 } 784 785 return 0; 786 787 /* Ensure counter set correcty to destroy all sysfs devices */ 788 i = VME_DEVS; 789err_sysfs: 790 while (i > 0) { 791 i--; 792 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); 793 } 794 class_destroy(vme_user_sysfs_class); 795 796 /* Ensure counter set correcty to unalloc all master windows */ 797 i = MASTER_MAX + 1; 798err_master_buf: 799 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) 800 kfree(image[i].kern_buf); 801err_master: 802 while (i > MASTER_MINOR) { 803 i--; 804 vme_master_free(image[i].resource); 805 } 806 807 /* 808 * Ensure counter set correcty to unalloc all slave windows and buffers 809 */ 810 i = SLAVE_MAX + 1; 811err_slave: 812 while (i > SLAVE_MINOR) { 813 i--; 814 vme_slave_free(image[i].resource); 815 buf_unalloc(i); 816 } 817err_class: 818 cdev_del(vme_user_cdev); 819err_char: 820 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); 821err_region: 822err_dev: 823 return err; 824} 825 826static int __exit vme_user_remove(struct device *dev, int cur_bus, int cur_slot) 827{ 828 int i; 829 830 /* Remove sysfs Entries */ 831 for (i = 0; i < VME_DEVS; i++) 832 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); 833 class_destroy(vme_user_sysfs_class); 834 835 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) 836 kfree(image[i].kern_buf); 837 838 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { 839 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); 840 vme_slave_free(image[i].resource); 841 buf_unalloc(i); 842 } 843 844 /* Unregister device driver */ 845 cdev_del(vme_user_cdev); 846 847 /* Unregiser the major and minor device numbers */ 848 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); 849 850 return 0; 851} 852 853static void __exit vme_user_exit(void) 854{ 855 vme_unregister_driver(&vme_user_driver); 856 857 kfree(vme_user_driver.bind_table); 858} 859 860 861MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); 862module_param_array(bus, int, &bus_num, 0); 863 864MODULE_DESCRIPTION("VME User Space Access Driver"); 865MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); 866MODULE_LICENSE("GPL"); 867 868module_init(vme_user_init); 869module_exit(vme_user_exit); 870