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 const char driver_name[] = "vme_user"; 45 46static int bus[VME_USER_BUS_MAX]; 47static unsigned 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 */ 94struct image_desc { 95 void *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}; 103static struct image_desc image[VME_DEVS]; 104 105struct driver_stats { 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}; 115static struct driver_stats statistics; 116 117static struct cdev *vme_user_cdev; /* Character device */ 118static struct class *vme_user_sysfs_class; /* Sysfs class */ 119static struct vme_dev *vme_user_bridge; /* Pointer to user 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 __user *, size_t, loff_t *); 133static ssize_t vme_user_write(struct file *, const char __user *, size_t, 134 loff_t *); 135static loff_t vme_user_llseek(struct file *, loff_t, int); 136static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long); 137 138static int vme_user_match(struct vme_dev *); 139static int __devinit vme_user_probe(struct vme_dev *); 140static int __devexit vme_user_remove(struct vme_dev *); 141 142static const struct file_operations vme_user_fops = { 143 .open = vme_user_open, 144 .release = vme_user_release, 145 .read = vme_user_read, 146 .write = vme_user_write, 147 .llseek = vme_user_llseek, 148 .unlocked_ioctl = vme_user_unlocked_ioctl, 149}; 150 151 152/* 153 * Reset all the statistic counters 154 */ 155static void reset_counters(void) 156{ 157 statistics.reads = 0; 158 statistics.writes = 0; 159 statistics.ioctls = 0; 160 statistics.irqs = 0; 161 statistics.berrs = 0; 162 statistics.dmaErrors = 0; 163 statistics.timeouts = 0; 164} 165 166static int vme_user_open(struct inode *inode, struct file *file) 167{ 168 int err; 169 unsigned int minor = MINOR(inode->i_rdev); 170 171 down(&image[minor].sem); 172 /* Allow device to be opened if a resource is needed and allocated. */ 173 if (minor < CONTROL_MINOR && image[minor].resource == NULL) { 174 printk(KERN_ERR "No resources allocated for device\n"); 175 err = -EINVAL; 176 goto err_res; 177 } 178 179 /* Increment user count */ 180 image[minor].users++; 181 182 up(&image[minor].sem); 183 184 return 0; 185 186err_res: 187 up(&image[minor].sem); 188 189 return err; 190} 191 192static int vme_user_release(struct inode *inode, struct file *file) 193{ 194 unsigned int minor = MINOR(inode->i_rdev); 195 196 down(&image[minor].sem); 197 198 /* Decrement user count */ 199 image[minor].users--; 200 201 up(&image[minor].sem); 202 203 return 0; 204} 205 206/* 207 * We are going ot alloc a page during init per window for small transfers. 208 * Small transfers will go VME -> buffer -> user space. Larger (more than a 209 * page) transfers will lock the user space buffer into memory and then 210 * transfer the data directly into the user space buffers. 211 */ 212static ssize_t resource_to_user(int minor, char __user *buf, size_t count, 213 loff_t *ppos) 214{ 215 ssize_t retval; 216 ssize_t copied = 0; 217 218 if (count <= image[minor].size_buf) { 219 /* We copy to kernel buffer */ 220 copied = vme_master_read(image[minor].resource, 221 image[minor].kern_buf, count, *ppos); 222 if (copied < 0) 223 return (int)copied; 224 225 retval = __copy_to_user(buf, image[minor].kern_buf, 226 (unsigned long)copied); 227 if (retval != 0) { 228 copied = (copied - retval); 229 printk(KERN_INFO "User copy failed\n"); 230 return -EINVAL; 231 } 232 233 } else { 234 /* XXX Need to write this */ 235 printk(KERN_INFO "Currently don't support large transfers\n"); 236 /* Map in pages from userspace */ 237 238 /* Call vme_master_read to do the transfer */ 239 return -EINVAL; 240 } 241 242 return copied; 243} 244 245/* 246 * We are going ot alloc a page during init per window for small transfers. 247 * Small transfers will go user space -> buffer -> VME. Larger (more than a 248 * page) transfers will lock the user space buffer into memory and then 249 * transfer the data directly from the user space buffers out to VME. 250 */ 251static ssize_t resource_from_user(unsigned int minor, const char __user *buf, 252 size_t count, loff_t *ppos) 253{ 254 ssize_t retval; 255 ssize_t copied = 0; 256 257 if (count <= image[minor].size_buf) { 258 retval = __copy_from_user(image[minor].kern_buf, buf, 259 (unsigned long)count); 260 if (retval != 0) 261 copied = (copied - retval); 262 else 263 copied = count; 264 265 copied = vme_master_write(image[minor].resource, 266 image[minor].kern_buf, copied, *ppos); 267 } else { 268 /* XXX Need to write this */ 269 printk(KERN_INFO "Currently don't support large transfers\n"); 270 /* Map in pages from userspace */ 271 272 /* Call vme_master_write to do the transfer */ 273 return -EINVAL; 274 } 275 276 return copied; 277} 278 279static ssize_t buffer_to_user(unsigned int minor, char __user *buf, 280 size_t count, loff_t *ppos) 281{ 282 void *image_ptr; 283 ssize_t retval; 284 285 image_ptr = image[minor].kern_buf + *ppos; 286 287 retval = __copy_to_user(buf, image_ptr, (unsigned long)count); 288 if (retval != 0) { 289 retval = (count - retval); 290 printk(KERN_WARNING "Partial copy to userspace\n"); 291 } else 292 retval = count; 293 294 /* Return number of bytes successfully read */ 295 return retval; 296} 297 298static ssize_t buffer_from_user(unsigned int minor, const char __user *buf, 299 size_t count, loff_t *ppos) 300{ 301 void *image_ptr; 302 size_t retval; 303 304 image_ptr = image[minor].kern_buf + *ppos; 305 306 retval = __copy_from_user(image_ptr, buf, (unsigned long)count); 307 if (retval != 0) { 308 retval = (count - retval); 309 printk(KERN_WARNING "Partial copy to userspace\n"); 310 } else 311 retval = count; 312 313 /* Return number of bytes successfully read */ 314 return retval; 315} 316 317static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count, 318 loff_t *ppos) 319{ 320 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); 321 ssize_t retval; 322 size_t image_size; 323 size_t okcount; 324 325 if (minor == CONTROL_MINOR) 326 return 0; 327 328 down(&image[minor].sem); 329 330 /* XXX Do we *really* want this helper - we can use vme_*_get ? */ 331 image_size = vme_get_size(image[minor].resource); 332 333 /* Ensure we are starting at a valid location */ 334 if ((*ppos < 0) || (*ppos > (image_size - 1))) { 335 up(&image[minor].sem); 336 return 0; 337 } 338 339 /* Ensure not reading past end of the image */ 340 if (*ppos + count > image_size) 341 okcount = image_size - *ppos; 342 else 343 okcount = count; 344 345 switch (type[minor]) { 346 case MASTER_MINOR: 347 retval = resource_to_user(minor, buf, okcount, ppos); 348 break; 349 case SLAVE_MINOR: 350 retval = buffer_to_user(minor, buf, okcount, ppos); 351 break; 352 default: 353 retval = -EINVAL; 354 } 355 356 up(&image[minor].sem); 357 358 if (retval > 0) 359 *ppos += retval; 360 361 return retval; 362} 363 364static ssize_t vme_user_write(struct file *file, const char __user *buf, 365 size_t count, loff_t *ppos) 366{ 367 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); 368 ssize_t retval; 369 size_t image_size; 370 size_t okcount; 371 372 if (minor == CONTROL_MINOR) 373 return 0; 374 375 down(&image[minor].sem); 376 377 image_size = vme_get_size(image[minor].resource); 378 379 /* Ensure we are starting at a valid location */ 380 if ((*ppos < 0) || (*ppos > (image_size - 1))) { 381 up(&image[minor].sem); 382 return 0; 383 } 384 385 /* Ensure not reading past end of the image */ 386 if (*ppos + count > image_size) 387 okcount = image_size - *ppos; 388 else 389 okcount = count; 390 391 switch (type[minor]) { 392 case MASTER_MINOR: 393 retval = resource_from_user(minor, buf, okcount, ppos); 394 break; 395 case SLAVE_MINOR: 396 retval = buffer_from_user(minor, buf, okcount, ppos); 397 break; 398 default: 399 retval = -EINVAL; 400 } 401 402 up(&image[minor].sem); 403 404 if (retval > 0) 405 *ppos += retval; 406 407 return retval; 408} 409 410static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) 411{ 412 loff_t absolute = -1; 413 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); 414 size_t image_size; 415 416 if (minor == CONTROL_MINOR) 417 return -EINVAL; 418 419 down(&image[minor].sem); 420 image_size = vme_get_size(image[minor].resource); 421 422 switch (whence) { 423 case SEEK_SET: 424 absolute = off; 425 break; 426 case SEEK_CUR: 427 absolute = file->f_pos + off; 428 break; 429 case SEEK_END: 430 absolute = image_size + off; 431 break; 432 default: 433 up(&image[minor].sem); 434 return -EINVAL; 435 break; 436 } 437 438 if ((absolute < 0) || (absolute >= image_size)) { 439 up(&image[minor].sem); 440 return -EINVAL; 441 } 442 443 file->f_pos = absolute; 444 445 up(&image[minor].sem); 446 447 return absolute; 448} 449 450/* 451 * The ioctls provided by the old VME access method (the one at vmelinux.org) 452 * are most certainly wrong as the effectively push the registers layout 453 * through to user space. Given that the VME core can handle multiple bridges, 454 * with different register layouts this is most certainly not the way to go. 455 * 456 * We aren't using the structures defined in the Motorola driver either - these 457 * are also quite low level, however we should use the definitions that have 458 * already been defined. 459 */ 460static int vme_user_ioctl(struct inode *inode, struct file *file, 461 unsigned int cmd, unsigned long arg) 462{ 463 struct vme_master master; 464 struct vme_slave slave; 465 struct vme_irq_id irq_req; 466 unsigned long copied; 467 unsigned int minor = MINOR(inode->i_rdev); 468 int retval; 469 dma_addr_t pci_addr; 470 void __user *argp = (void __user *)arg; 471 472 statistics.ioctls++; 473 474 switch (type[minor]) { 475 case CONTROL_MINOR: 476 switch (cmd) { 477 case VME_IRQ_GEN: 478 copied = copy_from_user(&irq_req, (char *)arg, 479 sizeof(struct vme_irq_id)); 480 if (copied != 0) { 481 printk(KERN_WARNING "Partial copy from userspace\n"); 482 return -EFAULT; 483 } 484 485 retval = vme_irq_generate(vme_user_bridge, 486 irq_req.level, 487 irq_req.statid); 488 489 return retval; 490 } 491 break; 492 case MASTER_MINOR: 493 switch (cmd) { 494 case VME_GET_MASTER: 495 memset(&master, 0, sizeof(struct vme_master)); 496 497 /* XXX We do not want to push aspace, cycle and width 498 * to userspace as they are 499 */ 500 retval = vme_master_get(image[minor].resource, 501 &master.enable, &master.vme_addr, 502 &master.size, &master.aspace, 503 &master.cycle, &master.dwidth); 504 505 copied = copy_to_user(argp, &master, 506 sizeof(struct vme_master)); 507 if (copied != 0) { 508 printk(KERN_WARNING "Partial copy to " 509 "userspace\n"); 510 return -EFAULT; 511 } 512 513 return retval; 514 break; 515 516 case VME_SET_MASTER: 517 518 copied = copy_from_user(&master, argp, sizeof(master)); 519 if (copied != 0) { 520 printk(KERN_WARNING "Partial copy from " 521 "userspace\n"); 522 return -EFAULT; 523 } 524 525 /* XXX We do not want to push aspace, cycle and width 526 * to userspace as they are 527 */ 528 return vme_master_set(image[minor].resource, 529 master.enable, master.vme_addr, master.size, 530 master.aspace, master.cycle, master.dwidth); 531 532 break; 533 } 534 break; 535 case SLAVE_MINOR: 536 switch (cmd) { 537 case VME_GET_SLAVE: 538 memset(&slave, 0, sizeof(struct vme_slave)); 539 540 /* XXX We do not want to push aspace, cycle and width 541 * to userspace as they are 542 */ 543 retval = vme_slave_get(image[minor].resource, 544 &slave.enable, &slave.vme_addr, 545 &slave.size, &pci_addr, &slave.aspace, 546 &slave.cycle); 547 548 copied = copy_to_user(argp, &slave, 549 sizeof(struct vme_slave)); 550 if (copied != 0) { 551 printk(KERN_WARNING "Partial copy to " 552 "userspace\n"); 553 return -EFAULT; 554 } 555 556 return retval; 557 break; 558 559 case VME_SET_SLAVE: 560 561 copied = copy_from_user(&slave, argp, sizeof(slave)); 562 if (copied != 0) { 563 printk(KERN_WARNING "Partial copy from " 564 "userspace\n"); 565 return -EFAULT; 566 } 567 568 /* XXX We do not want to push aspace, cycle and width 569 * to userspace as they are 570 */ 571 return vme_slave_set(image[minor].resource, 572 slave.enable, slave.vme_addr, slave.size, 573 image[minor].pci_buf, slave.aspace, 574 slave.cycle); 575 576 break; 577 } 578 break; 579 } 580 581 return -EINVAL; 582} 583 584static long 585vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 586{ 587 int ret; 588 589 mutex_lock(&vme_user_mutex); 590 ret = vme_user_ioctl(file->f_path.dentry->d_inode, file, cmd, arg); 591 mutex_unlock(&vme_user_mutex); 592 593 return ret; 594} 595 596 597/* 598 * Unallocate a previously allocated buffer 599 */ 600static void buf_unalloc(int num) 601{ 602 if (image[num].kern_buf) { 603#ifdef VME_DEBUG 604 printk(KERN_DEBUG "UniverseII:Releasing buffer at %p\n", 605 image[num].pci_buf); 606#endif 607 608 vme_free_consistent(image[num].resource, image[num].size_buf, 609 image[num].kern_buf, image[num].pci_buf); 610 611 image[num].kern_buf = NULL; 612 image[num].pci_buf = 0; 613 image[num].size_buf = 0; 614 615#ifdef VME_DEBUG 616 } else { 617 printk(KERN_DEBUG "UniverseII: Buffer not allocated\n"); 618#endif 619 } 620} 621 622static struct vme_driver vme_user_driver = { 623 .name = driver_name, 624 .match = vme_user_match, 625 .probe = vme_user_probe, 626 .remove = __devexit_p(vme_user_remove), 627}; 628 629 630static int __init vme_user_init(void) 631{ 632 int retval = 0; 633 634 printk(KERN_INFO "VME User Space Access Driver\n"); 635 636 if (bus_num == 0) { 637 printk(KERN_ERR "%s: No cards, skipping registration\n", 638 driver_name); 639 retval = -ENODEV; 640 goto err_nocard; 641 } 642 643 /* Let's start by supporting one bus, we can support more than one 644 * in future revisions if that ever becomes necessary. 645 */ 646 if (bus_num > VME_USER_BUS_MAX) { 647 printk(KERN_ERR "%s: Driver only able to handle %d buses\n", 648 driver_name, VME_USER_BUS_MAX); 649 bus_num = VME_USER_BUS_MAX; 650 } 651 652 /* 653 * Here we just register the maximum number of devices we can and 654 * leave vme_user_match() to allow only 1 to go through to probe(). 655 * This way, if we later want to allow multiple user access devices, 656 * we just change the code in vme_user_match(). 657 */ 658 retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); 659 if (retval != 0) 660 goto err_reg; 661 662 return retval; 663 664err_reg: 665err_nocard: 666 return retval; 667} 668 669static int vme_user_match(struct vme_dev *vdev) 670{ 671 if (vdev->num >= VME_USER_BUS_MAX) 672 return 0; 673 return 1; 674} 675 676/* 677 * In this simple access driver, the old behaviour is being preserved as much 678 * as practical. We will therefore reserve the buffers and request the images 679 * here so that we don't have to do it later. 680 */ 681static int __devinit vme_user_probe(struct vme_dev *vdev) 682{ 683 int i, err; 684 char name[12]; 685 686 /* Save pointer to the bridge device */ 687 if (vme_user_bridge != NULL) { 688 printk(KERN_ERR "%s: Driver can only be loaded for 1 device\n", 689 driver_name); 690 err = -EINVAL; 691 goto err_dev; 692 } 693 vme_user_bridge = vdev; 694 695 /* Initialise descriptors */ 696 for (i = 0; i < VME_DEVS; i++) { 697 image[i].kern_buf = NULL; 698 image[i].pci_buf = 0; 699 sema_init(&image[i].sem, 1); 700 image[i].device = NULL; 701 image[i].resource = NULL; 702 image[i].users = 0; 703 } 704 705 /* Initialise statistics counters */ 706 reset_counters(); 707 708 /* Assign major and minor numbers for the driver */ 709 err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, 710 driver_name); 711 if (err) { 712 printk(KERN_WARNING "%s: Error getting Major Number %d for " 713 "driver.\n", driver_name, VME_MAJOR); 714 goto err_region; 715 } 716 717 /* Register the driver as a char device */ 718 vme_user_cdev = cdev_alloc(); 719 vme_user_cdev->ops = &vme_user_fops; 720 vme_user_cdev->owner = THIS_MODULE; 721 err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); 722 if (err) { 723 printk(KERN_WARNING "%s: cdev_all failed\n", driver_name); 724 goto err_char; 725 } 726 727 /* Request slave resources and allocate buffers (128kB wide) */ 728 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { 729 /* XXX Need to properly request attributes */ 730 /* For ca91cx42 bridge there are only two slave windows 731 * supporting A16 addressing, so we request A24 supported 732 * by all windows. 733 */ 734 image[i].resource = vme_slave_request(vme_user_bridge, 735 VME_A24, VME_SCT); 736 if (image[i].resource == NULL) { 737 printk(KERN_WARNING "Unable to allocate slave " 738 "resource\n"); 739 goto err_slave; 740 } 741 image[i].size_buf = PCI_BUF_SIZE; 742 image[i].kern_buf = vme_alloc_consistent(image[i].resource, 743 image[i].size_buf, &image[i].pci_buf); 744 if (image[i].kern_buf == NULL) { 745 printk(KERN_WARNING "Unable to allocate memory for " 746 "buffer\n"); 747 image[i].pci_buf = 0; 748 vme_slave_free(image[i].resource); 749 err = -ENOMEM; 750 goto err_slave; 751 } 752 } 753 754 /* 755 * Request master resources allocate page sized buffers for small 756 * reads and writes 757 */ 758 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { 759 /* XXX Need to properly request attributes */ 760 image[i].resource = vme_master_request(vme_user_bridge, 761 VME_A32, VME_SCT, VME_D32); 762 if (image[i].resource == NULL) { 763 printk(KERN_WARNING "Unable to allocate master " 764 "resource\n"); 765 goto err_master; 766 } 767 image[i].size_buf = PCI_BUF_SIZE; 768 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); 769 if (image[i].kern_buf == NULL) { 770 printk(KERN_WARNING "Unable to allocate memory for " 771 "master window buffers\n"); 772 err = -ENOMEM; 773 goto err_master_buf; 774 } 775 } 776 777 /* Create sysfs entries - on udev systems this creates the dev files */ 778 vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); 779 if (IS_ERR(vme_user_sysfs_class)) { 780 printk(KERN_ERR "Error creating vme_user class.\n"); 781 err = PTR_ERR(vme_user_sysfs_class); 782 goto err_class; 783 } 784 785 /* Add sysfs Entries */ 786 for (i = 0; i < VME_DEVS; i++) { 787 int num; 788 switch (type[i]) { 789 case MASTER_MINOR: 790 sprintf(name, "bus/vme/m%%d"); 791 break; 792 case CONTROL_MINOR: 793 sprintf(name, "bus/vme/ctl"); 794 break; 795 case SLAVE_MINOR: 796 sprintf(name, "bus/vme/s%%d"); 797 break; 798 default: 799 err = -EINVAL; 800 goto err_sysfs; 801 break; 802 } 803 804 num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i; 805 image[i].device = device_create(vme_user_sysfs_class, NULL, 806 MKDEV(VME_MAJOR, i), NULL, name, num); 807 if (IS_ERR(image[i].device)) { 808 printk(KERN_INFO "%s: Error creating sysfs device\n", 809 driver_name); 810 err = PTR_ERR(image[i].device); 811 goto err_sysfs; 812 } 813 } 814 815 return 0; 816 817 /* Ensure counter set correcty to destroy all sysfs devices */ 818 i = VME_DEVS; 819err_sysfs: 820 while (i > 0) { 821 i--; 822 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); 823 } 824 class_destroy(vme_user_sysfs_class); 825 826 /* Ensure counter set correcty to unalloc all master windows */ 827 i = MASTER_MAX + 1; 828err_master_buf: 829 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) 830 kfree(image[i].kern_buf); 831err_master: 832 while (i > MASTER_MINOR) { 833 i--; 834 vme_master_free(image[i].resource); 835 } 836 837 /* 838 * Ensure counter set correcty to unalloc all slave windows and buffers 839 */ 840 i = SLAVE_MAX + 1; 841err_slave: 842 while (i > SLAVE_MINOR) { 843 i--; 844 buf_unalloc(i); 845 vme_slave_free(image[i].resource); 846 } 847err_class: 848 cdev_del(vme_user_cdev); 849err_char: 850 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); 851err_region: 852err_dev: 853 return err; 854} 855 856static int __devexit vme_user_remove(struct vme_dev *dev) 857{ 858 int i; 859 860 /* Remove sysfs Entries */ 861 for (i = 0; i < VME_DEVS; i++) 862 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); 863 class_destroy(vme_user_sysfs_class); 864 865 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { 866 kfree(image[i].kern_buf); 867 vme_master_free(image[i].resource); 868 } 869 870 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { 871 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); 872 buf_unalloc(i); 873 vme_slave_free(image[i].resource); 874 } 875 876 /* Unregister device driver */ 877 cdev_del(vme_user_cdev); 878 879 /* Unregiser the major and minor device numbers */ 880 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); 881 882 return 0; 883} 884 885static void __exit vme_user_exit(void) 886{ 887 vme_unregister_driver(&vme_user_driver); 888} 889 890 891MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); 892module_param_array(bus, int, &bus_num, 0); 893 894MODULE_DESCRIPTION("VME User Space Access Driver"); 895MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); 896MODULE_LICENSE("GPL"); 897 898module_init(vme_user_init); 899module_exit(vme_user_exit); 900