Version:  2.6.24 2.6.25 2.6.26 2.6.27 2.6.28 2.6.29 2.6.30 2.6.31 2.6.32 2.6.33 2.6.34

Architecture:  x86 arm avr32 blackfin m68k m68knommu microblaze mips powerpc sh

   /*
    * VMEbus User access driver
    *
    * Author: Martyn Welch <martyn.welch@ge.com>
    * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
    *
    * Based on work by:
    *   Tom Armistead and Ajit Prem
    *     Copyright 2004 Motorola Inc.
   *
   *
   * This program is free software; you can redistribute  it and/or modify it
   * under  the terms of  the GNU General  Public License as published by the
   * Free Software Foundation;  either version 2 of the  License, or (at your
   * option) any later version.
   */
  
  #include <linux/cdev.h>
  #include <linux/delay.h>
  #include <linux/device.h>
  #include <linux/dma-mapping.h>
  #include <linux/errno.h>
  #include <linux/init.h>
  #include <linux/ioctl.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/module.h>
  #include <linux/pagemap.h>
  #include <linux/pci.h>
  #include <linux/semaphore.h>
  #include <linux/slab.h>
  #include <linux/spinlock.h>
  #include <linux/syscalls.h>
  #include <linux/types.h>
  
  #include <asm/io.h>
  #include <asm/uaccess.h>
  
  #include "../vme.h"
  #include "vme_user.h"
  
  static char driver_name[] = "vme_user";
  
  static int bus[USER_BUS_MAX];
  static int bus_num;
  
  /* Currently Documentation/devices.txt defines the following for VME:
   *
   * 221 char     VME bus
   *                0 = /dev/bus/vme/m0           First master image
   *                1 = /dev/bus/vme/m1           Second master image
   *                2 = /dev/bus/vme/m2           Third master image
   *                3 = /dev/bus/vme/m3           Fourth master image
   *                4 = /dev/bus/vme/s0           First slave image
   *                5 = /dev/bus/vme/s1           Second slave image
   *                6 = /dev/bus/vme/s2           Third slave image
   *                7 = /dev/bus/vme/s3           Fourth slave image
   *                8 = /dev/bus/vme/ctl          Control
   *
   *              It is expected that all VME bus drivers will use the
   *              same interface.  For interface documentation see
   *              http://www.vmelinux.org/.
   *
   * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't
   * even support the tsi148 chipset (which has 8 master and 8 slave windows).
   * We'll run with this or now as far as possible, however it probably makes
   * sense to get rid of the old mappings and just do everything dynamically.
   *
   * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as
   * defined above and try to support at least some of the interface from
   * http://www.vmelinux.org/ as an alternative drive can be written providing a
   * saner interface later.
   *
   * The vmelinux.org driver never supported slave images, the devices reserved
   * for slaves were repurposed to support all 8 master images on the UniverseII!
   * We shall support 4 masters and 4 slaves with this driver.
   */
  #define VME_MAJOR       221     /* VME Major Device Number */
  #define VME_DEVS        9       /* Number of dev entries */
  
  #define MASTER_MINOR    0
  #define MASTER_MAX      3
  #define SLAVE_MINOR     4
  #define SLAVE_MAX       7
  #define CONTROL_MINOR   8
  
  #define PCI_BUF_SIZE  0x20000   /* Size of one slave image buffer */
  
  /*
   * Structure to handle image related parameters.
   */
  typedef struct {
          void __iomem *kern_buf; /* Buffer address in kernel space */
          dma_addr_t pci_buf;     /* Buffer address in PCI address space */
          unsigned long long size_buf;    /* Buffer size */
          struct semaphore sem;   /* Semaphore for locking image */
          struct device *device;  /* Sysfs device */
          struct vme_resource *resource;  /* VME resource */
          int users;              /* Number of current users */
 } image_desc_t;
 static image_desc_t image[VME_DEVS];
 
 typedef struct {
         unsigned long reads;
         unsigned long writes;
         unsigned long ioctls;
         unsigned long irqs;
         unsigned long berrs;
         unsigned long dmaErrors;
         unsigned long timeouts;
         unsigned long external;
 } driver_stats_t;
 static driver_stats_t statistics;
 
 struct cdev *vme_user_cdev;             /* Character device */
 struct class *vme_user_sysfs_class;     /* Sysfs class */
 struct device *vme_user_bridge;         /* Pointer to the bridge device */
 
 
 static const int type[VME_DEVS] = {     MASTER_MINOR,   MASTER_MINOR,
                                         MASTER_MINOR,   MASTER_MINOR,
                                         SLAVE_MINOR,    SLAVE_MINOR,
                                         SLAVE_MINOR,    SLAVE_MINOR,
                                         CONTROL_MINOR
                                 };
 
 
 static int vme_user_open(struct inode *, struct file *);
 static int vme_user_release(struct inode *, struct file *);
 static ssize_t vme_user_read(struct file *, char *, size_t, loff_t *);
 static ssize_t vme_user_write(struct file *, const char *, size_t, loff_t *);
 static loff_t vme_user_llseek(struct file *, loff_t, int);
 static int vme_user_ioctl(struct inode *, struct file *, unsigned int,
         unsigned long);
 
 static int __init vme_user_probe(struct device *, int, int);
 static int __exit vme_user_remove(struct device *, int, int);
 
 static struct file_operations vme_user_fops = {
         .open = vme_user_open,
         .release = vme_user_release,
         .read = vme_user_read,
         .write = vme_user_write,
         .llseek = vme_user_llseek,
         .ioctl = vme_user_ioctl,
 };
 
 
 /*
  * Reset all the statistic counters
  */
 static void reset_counters(void)
 {
         statistics.reads = 0;
         statistics.writes = 0;
         statistics.ioctls = 0;
         statistics.irqs = 0;
         statistics.berrs = 0;
         statistics.dmaErrors = 0;
         statistics.timeouts = 0;
 }
 
 static int vme_user_open(struct inode *inode, struct file *file)
 {
         int err;
         unsigned int minor = MINOR(inode->i_rdev);
 
         down(&image[minor].sem);
         /* Only allow device to be opened if a resource is allocated */
         if (image[minor].resource == NULL) {
                 printk(KERN_ERR "No resources allocated for device\n");
                 err = -EINVAL;
                 goto err_res;
         }
 
         /* Increment user count */
         image[minor].users++;
 
         up(&image[minor].sem);
 
         return 0;
 
 err_res:
         up(&image[minor].sem);
 
         return err;
 }
 
 static int vme_user_release(struct inode *inode, struct file *file)
 {
         unsigned int minor = MINOR(inode->i_rdev);
 
         down(&image[minor].sem);
 
         /* Decrement user count */
         image[minor].users--;
 
         up(&image[minor].sem);
 
         return 0;
 }
 
 /*
  * We are going ot alloc a page during init per window for small transfers.
  * Small transfers will go VME -> buffer -> user space. Larger (more than a
  * page) transfers will lock the user space buffer into memory and then
  * transfer the data directly into the user space buffers.
  */
 static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
         loff_t *ppos)
 {
         ssize_t retval;
         ssize_t copied = 0;
 
         if (count <= image[minor].size_buf) {
                 /* We copy to kernel buffer */
                 copied = vme_master_read(image[minor].resource,
                         image[minor].kern_buf, count, *ppos);
                 if (copied < 0) {
                         return (int)copied;
                 }
 
                 retval = __copy_to_user(buf, image[minor].kern_buf,
                         (unsigned long)copied);
                 if (retval != 0) {
                         copied = (copied - retval);
                         printk("User copy failed\n");
                         return -EINVAL;
                 }
 
         } else {
                 /* XXX Need to write this */
                 printk("Currently don't support large transfers\n");
                 /* Map in pages from userspace */
 
                 /* Call vme_master_read to do the transfer */
                 return -EINVAL;
         }
 
         return copied;
 }
 
 /*
  * We are going ot alloc a page during init per window for small transfers.
  * Small transfers will go user space -> buffer -> VME. Larger (more than a
  * page) transfers will lock the user space buffer into memory and then
  * transfer the data directly from the user space buffers out to VME.
  */
 static ssize_t resource_from_user(unsigned int minor, const char *buf,
         size_t count, loff_t *ppos)
 {
         ssize_t retval;
         ssize_t copied = 0;
 
         if (count <= image[minor].size_buf) {
                 retval = __copy_from_user(image[minor].kern_buf, buf,
                         (unsigned long)count);
                 if (retval != 0)
                         copied = (copied - retval);
                 else
                         copied = count;
 
                 copied = vme_master_write(image[minor].resource,
                         image[minor].kern_buf, copied, *ppos);
         } else {
                 /* XXX Need to write this */
                 printk("Currently don't support large transfers\n");
                 /* Map in pages from userspace */
 
                 /* Call vme_master_write to do the transfer */
                 return -EINVAL;
         }
 
         return copied;
 }
 
 static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
         size_t count, loff_t *ppos)
 {
         void __iomem *image_ptr;
         ssize_t retval;
 
         image_ptr = image[minor].kern_buf + *ppos;
 
         retval = __copy_to_user(buf, image_ptr, (unsigned long)count);
         if (retval != 0) {
                 retval = (count - retval);
                 printk(KERN_WARNING "Partial copy to userspace\n");
         } else
                 retval = count;
 
         /* Return number of bytes successfully read */
         return retval;
 }
 
 static ssize_t buffer_from_user(unsigned int minor, const char *buf,
         size_t count, loff_t *ppos)
 {
         void __iomem *image_ptr;
         size_t retval;
 
         image_ptr = image[minor].kern_buf + *ppos;
 
         retval = __copy_from_user(image_ptr, buf, (unsigned long)count);
         if (retval != 0) {
                 retval = (count - retval);
                 printk(KERN_WARNING "Partial copy to userspace\n");
         } else
                 retval = count;
 
         /* Return number of bytes successfully read */
         return retval;
 }
 
 static ssize_t vme_user_read(struct file *file, char *buf, size_t count,
                         loff_t * ppos)
 {
         unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
         ssize_t retval;
         size_t image_size;
         size_t okcount;
 
         down(&image[minor].sem);
 
         /* XXX Do we *really* want this helper - we can use vme_*_get ? */
         image_size = vme_get_size(image[minor].resource);
 
         /* Ensure we are starting at a valid location */
         if ((*ppos < 0) || (*ppos > (image_size - 1))) {
                 up(&image[minor].sem);
                 return 0;
         }
 
         /* Ensure not reading past end of the image */
         if (*ppos + count > image_size)
                 okcount = image_size - *ppos;
         else
                 okcount = count;
 
         switch (type[minor]){
         case MASTER_MINOR:
                 retval = resource_to_user(minor, buf, okcount, ppos);
                 break;
         case SLAVE_MINOR:
                 retval = buffer_to_user(minor, buf, okcount, ppos);
                 break;
         default:
                 retval = -EINVAL;
         }
 
         up(&image[minor].sem);
 
         if (retval > 0)
                 *ppos += retval;
 
         return retval;
 }
 
 static ssize_t vme_user_write(struct file *file, const char *buf, size_t count,
                          loff_t *ppos)
 {
         unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
         ssize_t retval;
         size_t image_size;
         size_t okcount;
 
         down(&image[minor].sem);
 
         image_size = vme_get_size(image[minor].resource);
 
         /* Ensure we are starting at a valid location */
         if ((*ppos < 0) || (*ppos > (image_size - 1))) {
                 up(&image[minor].sem);
                 return 0;
         }
 
         /* Ensure not reading past end of the image */
         if (*ppos + count > image_size)
                 okcount = image_size - *ppos;
         else
                 okcount = count;
 
         switch (type[minor]){
         case MASTER_MINOR:
                 retval = resource_from_user(minor, buf, okcount, ppos);
                 break;
         case SLAVE_MINOR:
                 retval = buffer_from_user(minor, buf, okcount, ppos);
                 break;
         default:
                 retval = -EINVAL;
         }
 
         up(&image[minor].sem);
 
         if (retval > 0)
                 *ppos += retval;
 
         return retval;
 }
 
 static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
 {
         loff_t absolute = -1;
         unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
         size_t image_size;
 
         down(&image[minor].sem);
         image_size = vme_get_size(image[minor].resource);
 
         switch (whence) {
         case SEEK_SET:
                 absolute = off;
                 break;
         case SEEK_CUR:
                 absolute = file->f_pos + off;
                 break;
         case SEEK_END:
                 absolute = image_size + off;
                 break;
         default:
                 up(&image[minor].sem);
                 return -EINVAL;
                 break;
         }
 
         if ((absolute < 0) || (absolute >= image_size)) {
                 up(&image[minor].sem);
                 return -EINVAL;
         }
 
         file->f_pos = absolute;
 
         up(&image[minor].sem);
 
         return absolute;
 }
 
 /*
  * The ioctls provided by the old VME access method (the one at vmelinux.org)
  * are most certainly wrong as the effectively push the registers layout
  * through to user space. Given that the VME core can handle multiple bridges,
  * with different register layouts this is most certainly not the way to go.
  *
  * We aren't using the structures defined in the Motorola driver either - these
  * are also quite low level, however we should use the definitions that have
  * already been defined.
  */
 static int vme_user_ioctl(struct inode *inode, struct file *file,
         unsigned int cmd, unsigned long arg)
 {
         struct vme_master master;
         struct vme_slave slave;
         unsigned long copied;
         unsigned int minor = MINOR(inode->i_rdev);
         int retval;
         dma_addr_t pci_addr;
 
         statistics.ioctls++;
 
         switch (type[minor]) {
         case CONTROL_MINOR:
                 break;
         case MASTER_MINOR:
                 switch (cmd) {
                 case VME_GET_MASTER:
                         memset(&master, 0, sizeof(struct vme_master));
 
                         /* XXX  We do not want to push aspace, cycle and width
                          *      to userspace as they are
                          */
                         retval = vme_master_get(image[minor].resource,
                                 &(master.enable), &(master.vme_addr),
                                 &(master.size), &(master.aspace),
                                 &(master.cycle), &(master.dwidth));
 
                         copied = copy_to_user((char *)arg, &master,
                                 sizeof(struct vme_master));
                         if (copied != 0) {
                                 printk(KERN_WARNING "Partial copy to "
                                         "userspace\n");
                                 return -EFAULT;
                         }
 
                         return retval;
                         break;
 
                 case VME_SET_MASTER:
 
                         copied = copy_from_user(&master, (char *)arg,
                                 sizeof(master));
                         if (copied != 0) {
                                 printk(KERN_WARNING "Partial copy from "
                                         "userspace\n");
                                 return -EFAULT;
                         }
 
                         /* XXX  We do not want to push aspace, cycle and width
                          *      to userspace as they are
                          */
                         return vme_master_set(image[minor].resource,
                                 master.enable, master.vme_addr, master.size,
                                 master.aspace, master.cycle, master.dwidth);
 
                         break;
                 }
                 break;
         case SLAVE_MINOR:
                 switch (cmd) {
                 case VME_GET_SLAVE:
                         memset(&slave, 0, sizeof(struct vme_slave));
 
                         /* XXX  We do not want to push aspace, cycle and width
                          *      to userspace as they are
                          */
                         retval = vme_slave_get(image[minor].resource,
                                 &(slave.enable), &(slave.vme_addr),
                                 &(slave.size), &pci_addr, &(slave.aspace),
                                 &(slave.cycle));
 
                         copied = copy_to_user((char *)arg, &slave,
                                 sizeof(struct vme_slave));
                         if (copied != 0) {
                                 printk(KERN_WARNING "Partial copy to "
                                         "userspace\n");
                                 return -EFAULT;
                         }
 
                         return retval;
                         break;
 
                 case VME_SET_SLAVE:
 
                         copied = copy_from_user(&slave, (char *)arg,
                                 sizeof(slave));
                         if (copied != 0) {
                                 printk(KERN_WARNING "Partial copy from "
                                         "userspace\n");
                                 return -EFAULT;
                         }
 
                         /* XXX  We do not want to push aspace, cycle and width
                          *      to userspace as they are
                          */
                         return vme_slave_set(image[minor].resource,
                                 slave.enable, slave.vme_addr, slave.size,
                                 image[minor].pci_buf, slave.aspace,
                                 slave.cycle);
 
                         break;
                 }
                 break;
         }
 
         return -EINVAL;
 }
 
 
 /*
  * Unallocate a previously allocated buffer
  */
 static void buf_unalloc (int num)
 {
         if (image[num].kern_buf) {
 #ifdef VME_DEBUG
                 printk(KERN_DEBUG "UniverseII:Releasing buffer at %p\n",
                         image[num].pci_buf);
 #endif
 
                 vme_free_consistent(image[num].resource, image[num].size_buf,
                         image[num].kern_buf, image[num].pci_buf);
 
                 image[num].kern_buf = NULL;
                 image[num].pci_buf = 0;
                 image[num].size_buf = 0;
 
 #ifdef VME_DEBUG
         } else {
                 printk(KERN_DEBUG "UniverseII: Buffer not allocated\n");
 #endif
         }
 }
 
 static struct vme_driver vme_user_driver = {
         .name = driver_name,
         .probe = vme_user_probe,
         .remove = vme_user_remove,
 };
 
 
 static int __init vme_user_init(void)
 {
         int retval = 0;
         int i;
         struct vme_device_id *ids;
 
         printk(KERN_INFO "VME User Space Access Driver\n");
 
         if (bus_num == 0) {
                 printk(KERN_ERR "%s: No cards, skipping registration\n",
                         driver_name);
                 goto err_nocard;
         }
 
         /* Let's start by supporting one bus, we can support more than one
          * in future revisions if that ever becomes necessary.
          */
         if (bus_num > USER_BUS_MAX) {
                 printk(KERN_ERR "%s: Driver only able to handle %d buses\n",
                         driver_name, USER_BUS_MAX);
                 bus_num = USER_BUS_MAX;
         }
 
 
         /* Dynamically create the bind table based on module parameters */
         ids = kmalloc(sizeof(struct vme_device_id) * (bus_num + 1), GFP_KERNEL);
         if (ids == NULL) {
                 printk(KERN_ERR "%s: Unable to allocate ID table\n",
                         driver_name);
                 goto err_id;
         }
 
         memset(ids, 0, (sizeof(struct vme_device_id) * (bus_num + 1)));
 
         for (i = 0; i < bus_num; i++) {
                 ids[i].bus = bus[i];
                 /*
                  * We register the driver against the slot occupied by *this*
                  * card, since it's really a low level way of controlling
                  * the VME bridge
                  */
                 ids[i].slot = VME_SLOT_CURRENT;
         }
 
         vme_user_driver.bind_table = ids;
 
         retval = vme_register_driver(&vme_user_driver);
         if (retval != 0)
                 goto err_reg;
 
         return retval;
 
         vme_unregister_driver(&vme_user_driver);
 err_reg:
         kfree(ids);
 err_id:
 err_nocard:
         return retval;
 }
 
 /*
  * In this simple access driver, the old behaviour is being preserved as much
  * as practical. We will therefore reserve the buffers and request the images
  * here so that we don't have to do it later.
  */
 static int __init vme_user_probe(struct device *dev, int cur_bus, int cur_slot)
 {
         int i, err;
         char name[12];
 
         /* Save pointer to the bridge device */
         if (vme_user_bridge != NULL) {
                 printk(KERN_ERR "%s: Driver can only be loaded for 1 device\n",
                         driver_name);
                 err = -EINVAL;
                 goto err_dev;
         }
         vme_user_bridge = dev;
 
         /* Initialise descriptors */
         for (i = 0; i < VME_DEVS; i++) {
                 image[i].kern_buf = NULL;
                 image[i].pci_buf = 0;
                 init_MUTEX(&(image[i].sem));
                 image[i].device = NULL;
                 image[i].resource = NULL;
                 image[i].users = 0;
         }
 
         /* Initialise statistics counters */
         reset_counters();
 
         /* Assign major and minor numbers for the driver */
         err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS,
                 driver_name);
         if (err) {
                 printk(KERN_WARNING "%s: Error getting Major Number %d for "
                 "driver.\n", driver_name, VME_MAJOR);
                 goto err_region;
         }
 
         /* Register the driver as a char device */
         vme_user_cdev = cdev_alloc();
         vme_user_cdev->ops = &vme_user_fops;
         vme_user_cdev->owner = THIS_MODULE;
         err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS);
         if (err) {
                 printk(KERN_WARNING "%s: cdev_all failed\n", driver_name);
                 goto err_char;
         }
 
         /* Request slave resources and allocate buffers (128kB wide) */
         for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
                 /* XXX Need to properly request attributes */
                 /* For ca91cx42 bridge there are only two slave windows
                  * supporting A16 addressing, so we request A24 supported
                  * by all windows.
                  */
                 image[i].resource = vme_slave_request(vme_user_bridge,
                         VME_A24, VME_SCT);
                 if (image[i].resource == NULL) {
                         printk(KERN_WARNING "Unable to allocate slave "
                                 "resource\n");
                         goto err_slave;
                 }
                 image[i].size_buf = PCI_BUF_SIZE;
                 image[i].kern_buf = vme_alloc_consistent(image[i].resource,
                         image[i].size_buf, &(image[i].pci_buf));
                 if (image[i].kern_buf == NULL) {
                         printk(KERN_WARNING "Unable to allocate memory for "
                                 "buffer\n");
                         image[i].pci_buf = 0;
                         vme_slave_free(image[i].resource);
                         err = -ENOMEM;
                         goto err_slave;
                 }
         }
 
         /*
          * Request master resources allocate page sized buffers for small
          * reads and writes
          */
         for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
                 /* XXX Need to properly request attributes */
                 image[i].resource = vme_master_request(vme_user_bridge,
                         VME_A32, VME_SCT, VME_D32);
                 if (image[i].resource == NULL) {
                         printk(KERN_WARNING "Unable to allocate master "
                                 "resource\n");
                         goto err_master;
                 }
                 image[i].size_buf = PCI_BUF_SIZE;
                 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL);
                 if (image[i].kern_buf == NULL) {
                         printk(KERN_WARNING "Unable to allocate memory for "
                                 "master window buffers\n");
                         err = -ENOMEM;
                         goto err_master_buf;
                 }
         }
 
         /* Create sysfs entries - on udev systems this creates the dev files */
         vme_user_sysfs_class = class_create(THIS_MODULE, driver_name);
         if (IS_ERR(vme_user_sysfs_class)) {
                 printk(KERN_ERR "Error creating vme_user class.\n");
                 err = PTR_ERR(vme_user_sysfs_class);
                 goto err_class;
         }
 
         /* Add sysfs Entries */
         for (i=0; i<VME_DEVS; i++) {
                 switch (type[i]) {
                 case MASTER_MINOR:
                         sprintf(name,"bus/vme/m%%d");
                         break;
                 case CONTROL_MINOR:
                         sprintf(name,"bus/vme/ctl");
                         break;
                 case SLAVE_MINOR:
                         sprintf(name,"bus/vme/s%%d");
                         break;
                 default:
                         err = -EINVAL;
                         goto err_sysfs;
                         break;
                 }
 
                 image[i].device =
                         device_create(vme_user_sysfs_class, NULL,
                                 MKDEV(VME_MAJOR, i), NULL, name,
                                 (type[i] == SLAVE_MINOR)? i - (MASTER_MAX + 1) : i);
                 if (IS_ERR(image[i].device)) {
                         printk("%s: Error creating sysfs device\n",
                                 driver_name);
                         err = PTR_ERR(image[i].device);
                         goto err_sysfs;
                 }
         }
 
         return 0;
 
         /* Ensure counter set correcty to destroy all sysfs devices */
         i = VME_DEVS;
 err_sysfs:
         while (i > 0){
                 i--;
                 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
         }
         class_destroy(vme_user_sysfs_class);
 
         /* Ensure counter set correcty to unalloc all master windows */
         i = MASTER_MAX + 1;
 err_master_buf:
         for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++)
                 kfree(image[i].kern_buf);
 err_master:
         while (i > MASTER_MINOR) {
                 i--;
                 vme_master_free(image[i].resource);
         }
 
         /*
          * Ensure counter set correcty to unalloc all slave windows and buffers
          */
         i = SLAVE_MAX + 1;
 err_slave:
         while (i > SLAVE_MINOR) {
                 i--;
                 vme_slave_free(image[i].resource);
                 buf_unalloc(i);
         }
 err_class:
         cdev_del(vme_user_cdev);
 err_char:
         unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
 err_region:
 err_dev:
         return err;
 }
 
 static int __exit vme_user_remove(struct device *dev, int cur_bus, int cur_slot)
 {
         int i;
 
         /* Remove sysfs Entries */
         for(i=0; i<VME_DEVS; i++) {
                 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
         }
         class_destroy(vme_user_sysfs_class);
 
         for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++)
                 kfree(image[i].kern_buf);
 
         for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
                 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
                 vme_slave_free(image[i].resource);
                 buf_unalloc(i);
         }
 
         /* Unregister device driver */
         cdev_del(vme_user_cdev);
 
         /* Unregiser the major and minor device numbers */
         unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
 
         return 0;
 }
 
 static void __exit vme_user_exit(void)
 {
         vme_unregister_driver(&vme_user_driver);
 
         kfree(vme_user_driver.bind_table);
 }
 
 
 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected");
 module_param_array(bus, int, &bus_num, 0);
 
 MODULE_DESCRIPTION("VME User Space Access Driver");
 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
 MODULE_LICENSE("GPL");
 
 module_init(vme_user_init);
 module_exit(vme_user_exit);
 

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