diff options
Diffstat (limited to 'drivers/staging/vme/devices/vme_user.c')
| -rw-r--r-- | drivers/staging/vme/devices/vme_user.c | 257 |
1 files changed, 71 insertions, 186 deletions
diff --git a/drivers/staging/vme/devices/vme_user.c b/drivers/staging/vme/devices/vme_user.c index 19ba749bb122..9cca97af3044 100644 --- a/drivers/staging/vme/devices/vme_user.c +++ b/drivers/staging/vme/devices/vme_user.c @@ -99,23 +99,10 @@ struct image_desc { struct mutex mutex; /* Mutex for locking image */ struct device *device; /* Sysfs device */ struct vme_resource *resource; /* VME resource */ - int users; /* Number of current users */ int mmap_count; /* Number of current mmap's */ }; 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 vme_dev *vme_user_bridge; /* Pointer to user device */ @@ -128,98 +115,11 @@ static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_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 vme_user_mmap(struct file *file, struct vm_area_struct *vma); - -static void vme_user_vm_open(struct vm_area_struct *vma); -static void vme_user_vm_close(struct vm_area_struct *vma); - -static int vme_user_match(struct vme_dev *); -static int vme_user_probe(struct vme_dev *); -static int vme_user_remove(struct vme_dev *); - -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, - .compat_ioctl = vme_user_unlocked_ioctl, - .mmap = vme_user_mmap, -}; - struct vme_user_vma_priv { unsigned int minor; atomic_t refcnt; }; -static const struct vm_operations_struct vme_user_vm_ops = { - .open = vme_user_vm_open, - .close = vme_user_vm_close, -}; - - -/* - * 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); - - mutex_lock(&image[minor].mutex); - /* Allow device to be opened if a resource is needed and allocated. */ - if (minor < CONTROL_MINOR && image[minor].resource == NULL) { - pr_err("No resources allocated for device\n"); - err = -EINVAL; - goto err_res; - } - - /* Increment user count */ - image[minor].users++; - - mutex_unlock(&image[minor].mutex); - - return 0; - -err_res: - mutex_unlock(&image[minor].mutex); - - return err; -} - -static int vme_user_release(struct inode *inode, struct file *file) -{ - unsigned int minor = MINOR(inode->i_rdev); - - mutex_lock(&image[minor].mutex); - - /* Decrement user count */ - image[minor].users--; - - mutex_unlock(&image[minor].mutex); - - return 0; -} /* * We are going ot alloc a page during init per window for small transfers. @@ -430,15 +330,17 @@ static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) size_t image_size; loff_t res; - if (minor == CONTROL_MINOR) - return -EINVAL; - - mutex_lock(&image[minor].mutex); - image_size = vme_get_size(image[minor].resource); - res = fixed_size_llseek(file, off, whence, image_size); - mutex_unlock(&image[minor].mutex); + switch (type[minor]) { + case MASTER_MINOR: + case SLAVE_MINOR: + mutex_lock(&image[minor].mutex); + image_size = vme_get_size(image[minor].resource); + res = fixed_size_llseek(file, off, whence, image_size); + mutex_unlock(&image[minor].mutex); + return res; + } - return res; + return -EINVAL; } /* @@ -463,8 +365,6 @@ static int vme_user_ioctl(struct inode *inode, struct file *file, dma_addr_t pci_addr; void __user *argp = (void __user *)arg; - statistics.ioctls++; - switch (type[minor]) { case CONTROL_MINOR: switch (cmd) { @@ -608,6 +508,11 @@ static void vme_user_vm_close(struct vm_area_struct *vma) kfree(vma_priv); } +static const struct vm_operations_struct vme_user_vm_ops = { + .open = vme_user_vm_open, + .close = vme_user_vm_close, +}; + static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma) { int err; @@ -649,78 +554,15 @@ static int vme_user_mmap(struct file *file, struct vm_area_struct *vma) return -ENODEV; } - -/* - * Unallocate a previously allocated buffer - */ -static void buf_unalloc(int num) -{ - if (image[num].kern_buf) { -#ifdef VME_DEBUG - pr_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 { - pr_debug("UniverseII: Buffer not allocated\n"); -#endif - } -} - -static struct vme_driver vme_user_driver = { - .name = driver_name, - .match = vme_user_match, - .probe = vme_user_probe, - .remove = vme_user_remove, +static const struct file_operations vme_user_fops = { + .read = vme_user_read, + .write = vme_user_write, + .llseek = vme_user_llseek, + .unlocked_ioctl = vme_user_unlocked_ioctl, + .compat_ioctl = vme_user_unlocked_ioctl, + .mmap = vme_user_mmap, }; - -static int __init vme_user_init(void) -{ - int retval = 0; - - pr_info("VME User Space Access Driver\n"); - - if (bus_num == 0) { - pr_err("No cards, skipping registration\n"); - 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 > VME_USER_BUS_MAX) { - pr_err("Driver only able to handle %d buses\n", - VME_USER_BUS_MAX); - bus_num = VME_USER_BUS_MAX; - } - - /* - * Here we just register the maximum number of devices we can and - * leave vme_user_match() to allow only 1 to go through to probe(). - * This way, if we later want to allow multiple user access devices, - * we just change the code in vme_user_match(). - */ - retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); - if (retval != 0) - goto err_reg; - - return retval; - -err_reg: -err_nocard: - return retval; -} - static int vme_user_match(struct vme_dev *vdev) { int i; @@ -760,12 +602,8 @@ static int vme_user_probe(struct vme_dev *vdev) mutex_init(&image[i].mutex); 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); @@ -902,7 +740,8 @@ err_master: err_slave: while (i > SLAVE_MINOR) { i--; - buf_unalloc(i); + vme_free_consistent(image[i].resource, image[i].size_buf, + image[i].kern_buf, image[i].pci_buf); vme_slave_free(image[i].resource); } err_class: @@ -932,7 +771,8 @@ static int vme_user_remove(struct vme_dev *dev) 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_free_consistent(image[i].resource, image[i].size_buf, + image[i].kern_buf, image[i].pci_buf); vme_slave_free(image[i].resource); } @@ -945,6 +785,51 @@ static int vme_user_remove(struct vme_dev *dev) return 0; } +static struct vme_driver vme_user_driver = { + .name = driver_name, + .match = vme_user_match, + .probe = vme_user_probe, + .remove = vme_user_remove, +}; + +static int __init vme_user_init(void) +{ + int retval = 0; + + pr_info("VME User Space Access Driver\n"); + + if (bus_num == 0) { + pr_err("No cards, skipping registration\n"); + 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 > VME_USER_BUS_MAX) { + pr_err("Driver only able to handle %d buses\n", + VME_USER_BUS_MAX); + bus_num = VME_USER_BUS_MAX; + } + + /* + * Here we just register the maximum number of devices we can and + * leave vme_user_match() to allow only 1 to go through to probe(). + * This way, if we later want to allow multiple user access devices, + * we just change the code in vme_user_match(). + */ + retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); + if (retval != 0) + goto err_reg; + + return retval; + +err_reg: +err_nocard: + return retval; +} + static void __exit vme_user_exit(void) { vme_unregister_driver(&vme_user_driver); |