/drivers/staging/vme/devices/vme_user.c
C | 916 lines | 621 code | 148 blank | 147 comment | 86 complexity | a83308c6bb497192700ce45807b0cb8f MD5 | raw file
- /*
- * 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/mutex.h>
- #include <linux/types.h>
- #include <linux/io.h>
- #include <linux/uaccess.h>
- #include "../vme.h"
- #include "vme_user.h"
- static DEFINE_MUTEX(vme_user_mutex);
- static const char driver_name[] = "vme_user";
- static int bus[USER_BUS_MAX];
- static unsigned 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.
- */
- struct image_desc {
- void *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 */
- };
- static struct image_desc image[VME_DEVS];
- struct driver_stats {
- unsigned long reads;
- unsigned long writes;
- unsigned long ioctls;
- unsigned long irqs;
- unsigned long berrs;
- unsigned long dmaErrors;
- unsigned long timeouts;
- unsigned long external;
- };
- static struct driver_stats statistics;
- static struct cdev *vme_user_cdev; /* Character device */
- static struct class *vme_user_sysfs_class; /* Sysfs class */
- static struct device *vme_user_bridge; /* Pointer to 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 __user *, size_t, loff_t *);
- static ssize_t vme_user_write(struct file *, const char __user *, size_t,
- loff_t *);
- static loff_t vme_user_llseek(struct file *, loff_t, int);
- static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long);
- static int __devinit vme_user_probe(struct device *, int, int);
- static int __devexit vme_user_remove(struct device *, int, int);
- static const 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,
- .unlocked_ioctl = vme_user_unlocked_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);
- /* Allow device to be opened if a resource is needed and allocated. */
- if (minor < CONTROL_MINOR && 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(KERN_INFO "User copy failed\n");
- return -EINVAL;
- }
- } else {
- /* XXX Need to write this */
- printk(KERN_INFO "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 __user *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(KERN_INFO "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 *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 __user *buf,
- size_t count, loff_t *ppos)
- {
- void *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 __user *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;
- if (minor == CONTROL_MINOR)
- return 0;
- 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 __user *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;
- if (minor == CONTROL_MINOR)
- return 0;
- 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;
- if (minor == CONTROL_MINOR)
- return -EINVAL;
- 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;
- struct vme_irq_id irq_req;
- unsigned long copied;
- unsigned int minor = MINOR(inode->i_rdev);
- int retval;
- dma_addr_t pci_addr;
- void __user *argp = (void __user *)arg;
- statistics.ioctls++;
- switch (type[minor]) {
- case CONTROL_MINOR:
- switch (cmd) {
- case VME_IRQ_GEN:
- copied = copy_from_user(&irq_req, (char *)arg,
- sizeof(struct vme_irq_id));
- if (copied != 0) {
- printk(KERN_WARNING "Partial copy from userspace\n");
- return -EFAULT;
- }
- retval = vme_irq_generate(vme_user_bridge,
- irq_req.level,
- irq_req.statid);
- return retval;
- }
- 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(argp, &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, argp, 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(argp, &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, argp, 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;
- }
- static long
- vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
- {
- int ret;
- mutex_lock(&vme_user_mutex);
- ret = vme_user_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
- mutex_unlock(&vme_user_mutex);
- return ret;
- }
- /*
- * 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 = __devexit_p(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);
- retval = -ENODEV;
- 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);
- retval = -ENOMEM;
- 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;
- 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 __devinit 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;
- sema_init(&image[i].sem, 1);
- 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++) {
- int num;
- 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;
- }
- num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i;
- image[i].device = device_create(vme_user_sysfs_class, NULL,
- MKDEV(VME_MAJOR, i), NULL, name, num);
- if (IS_ERR(image[i].device)) {
- printk(KERN_INFO "%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--;
- buf_unalloc(i);
- vme_slave_free(image[i].resource);
- }
- 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 __devexit 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);
- vme_master_free(image[i].resource);
- }
- for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
- vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
- buf_unalloc(i);
- vme_slave_free(image[i].resource);
- }
- /* 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);