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drivers/uio/uio.c
19.5 KB
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/* * drivers/uio/uio.c * * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de> * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> |
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* Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de> |
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* Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com> * * Userspace IO * * Base Functions * * Licensed under the GPLv2 only. */ #include <linux/module.h> #include <linux/init.h> #include <linux/poll.h> #include <linux/device.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> #include <linux/idr.h> |
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#include <linux/sched.h> |
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#include <linux/string.h> #include <linux/kobject.h> |
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#include <linux/cdev.h> |
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#include <linux/uio_driver.h> |
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#define UIO_MAX_DEVICES (1U << MINORBITS) |
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struct uio_device { struct module *owner; struct device *dev; int minor; atomic_t event; struct fasync_struct *async_queue; wait_queue_head_t wait; int vma_count; struct uio_info *info; |
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struct kobject *map_dir; |
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struct kobject *portio_dir; |
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}; static int uio_major; |
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static struct cdev *uio_cdev; |
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static DEFINE_IDR(uio_idr); |
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static const struct file_operations uio_fops; |
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|
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/* Protect idr accesses */ static DEFINE_MUTEX(minor_lock); |
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/* * attributes */ |
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struct uio_map { struct kobject kobj; struct uio_mem *mem; |
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}; |
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#define to_map(map) container_of(map, struct uio_map, kobj) |
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|
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static ssize_t map_name_show(struct uio_mem *mem, char *buf) { if (unlikely(!mem->name)) mem->name = ""; return sprintf(buf, "%s ", mem->name); } |
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static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
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{ |
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return sprintf(buf, "0x%llx ", (unsigned long long)mem->addr); |
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} |
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static ssize_t map_size_show(struct uio_mem *mem, char *buf) { return sprintf(buf, "0x%lx ", mem->size); |
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} |
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static ssize_t map_offset_show(struct uio_mem *mem, char *buf) { |
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return sprintf(buf, "0x%llx ", (unsigned long long)mem->addr & ~PAGE_MASK); |
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} |
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struct map_sysfs_entry { |
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struct attribute attr; ssize_t (*show)(struct uio_mem *, char *); ssize_t (*store)(struct uio_mem *, const char *, size_t); }; |
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static struct map_sysfs_entry name_attribute = __ATTR(name, S_IRUGO, map_name_show, NULL); |
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static struct map_sysfs_entry addr_attribute = |
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__ATTR(addr, S_IRUGO, map_addr_show, NULL); |
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static struct map_sysfs_entry size_attribute = |
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__ATTR(size, S_IRUGO, map_size_show, NULL); |
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static struct map_sysfs_entry offset_attribute = |
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__ATTR(offset, S_IRUGO, map_offset_show, NULL); |
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|
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static struct attribute *attrs[] = { |
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&name_attribute.attr, |
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&addr_attribute.attr, |
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&size_attribute.attr, |
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&offset_attribute.attr, |
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NULL, /* need to NULL terminate the list of attributes */ |
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}; |
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static void map_release(struct kobject *kobj) { struct uio_map *map = to_map(kobj); kfree(map); } |
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static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct uio_map *map = to_map(kobj); struct uio_mem *mem = map->mem; |
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struct map_sysfs_entry *entry; |
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|
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entry = container_of(attr, struct map_sysfs_entry, attr); |
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if (!entry->show) return -EIO; return entry->show(mem, buf); } |
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static const struct sysfs_ops map_sysfs_ops = { |
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.show = map_type_show, }; |
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static struct kobj_type map_attr_type = { |
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.release = map_release, |
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.sysfs_ops = &map_sysfs_ops, |
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.default_attrs = attrs, |
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}; |
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struct uio_portio { struct kobject kobj; struct uio_port *port; }; #define to_portio(portio) container_of(portio, struct uio_portio, kobj) |
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static ssize_t portio_name_show(struct uio_port *port, char *buf) { if (unlikely(!port->name)) port->name = ""; return sprintf(buf, "%s ", port->name); } |
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static ssize_t portio_start_show(struct uio_port *port, char *buf) { return sprintf(buf, "0x%lx ", port->start); } static ssize_t portio_size_show(struct uio_port *port, char *buf) { return sprintf(buf, "0x%lx ", port->size); } static ssize_t portio_porttype_show(struct uio_port *port, char *buf) { const char *porttypes[] = {"none", "x86", "gpio", "other"}; if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) return -EINVAL; return sprintf(buf, "port_%s ", porttypes[port->porttype]); } struct portio_sysfs_entry { struct attribute attr; ssize_t (*show)(struct uio_port *, char *); ssize_t (*store)(struct uio_port *, const char *, size_t); }; |
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static struct portio_sysfs_entry portio_name_attribute = __ATTR(name, S_IRUGO, portio_name_show, NULL); |
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static struct portio_sysfs_entry portio_start_attribute = __ATTR(start, S_IRUGO, portio_start_show, NULL); static struct portio_sysfs_entry portio_size_attribute = __ATTR(size, S_IRUGO, portio_size_show, NULL); static struct portio_sysfs_entry portio_porttype_attribute = __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); static struct attribute *portio_attrs[] = { |
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&portio_name_attribute.attr, |
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&portio_start_attribute.attr, &portio_size_attribute.attr, &portio_porttype_attribute.attr, NULL, }; static void portio_release(struct kobject *kobj) { struct uio_portio *portio = to_portio(kobj); kfree(portio); } static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct uio_portio *portio = to_portio(kobj); struct uio_port *port = portio->port; struct portio_sysfs_entry *entry; entry = container_of(attr, struct portio_sysfs_entry, attr); if (!entry->show) return -EIO; return entry->show(port, buf); } |
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static const struct sysfs_ops portio_sysfs_ops = { |
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.show = portio_type_show, }; static struct kobj_type portio_attr_type = { .release = portio_release, .sysfs_ops = &portio_sysfs_ops, .default_attrs = portio_attrs, }; |
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static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) { struct uio_device *idev = dev_get_drvdata(dev); |
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return sprintf(buf, "%s ", idev->info->name); |
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} |
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static ssize_t show_version(struct device *dev, struct device_attribute *attr, char *buf) { struct uio_device *idev = dev_get_drvdata(dev); |
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return sprintf(buf, "%s ", idev->info->version); |
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} |
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static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf) { struct uio_device *idev = dev_get_drvdata(dev); |
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return sprintf(buf, "%u ", (unsigned int)atomic_read(&idev->event)); |
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} |
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static struct device_attribute uio_class_attributes[] = { __ATTR(name, S_IRUGO, show_name, NULL), __ATTR(version, S_IRUGO, show_version, NULL), __ATTR(event, S_IRUGO, show_event, NULL), {} |
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}; |
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/* UIO class infrastructure */ static struct class uio_class = { .name = "uio", .dev_attrs = uio_class_attributes, |
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}; /* * device functions */ static int uio_dev_add_attributes(struct uio_device *idev) { int ret; |
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int mi, pi; |
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int map_found = 0; |
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int portio_found = 0; |
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struct uio_mem *mem; |
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struct uio_map *map; |
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struct uio_port *port; struct uio_portio *portio; |
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for (mi = 0; mi < MAX_UIO_MAPS; mi++) { mem = &idev->info->mem[mi]; if (mem->size == 0) break; if (!map_found) { map_found = 1; |
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idev->map_dir = kobject_create_and_add("maps", &idev->dev->kobj); if (!idev->map_dir) |
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goto err_map; |
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} |
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map = kzalloc(sizeof(*map), GFP_KERNEL); if (!map) |
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goto err_map; |
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kobject_init(&map->kobj, &map_attr_type); |
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map->mem = mem; mem->map = map; |
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ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
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if (ret) |
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goto err_map; |
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ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
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if (ret) |
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goto err_map; } for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { port = &idev->info->port[pi]; if (port->size == 0) break; if (!portio_found) { portio_found = 1; idev->portio_dir = kobject_create_and_add("portio", &idev->dev->kobj); if (!idev->portio_dir) goto err_portio; } portio = kzalloc(sizeof(*portio), GFP_KERNEL); if (!portio) goto err_portio; kobject_init(&portio->kobj, &portio_attr_type); portio->port = port; port->portio = portio; ret = kobject_add(&portio->kobj, idev->portio_dir, "port%d", pi); if (ret) goto err_portio; ret = kobject_uevent(&portio->kobj, KOBJ_ADD); if (ret) goto err_portio; |
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} return 0; |
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err_portio: for (pi--; pi >= 0; pi--) { port = &idev->info->port[pi]; portio = port->portio; kobject_put(&portio->kobj); } kobject_put(idev->portio_dir); err_map: |
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for (mi--; mi>=0; mi--) { mem = &idev->info->mem[mi]; |
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map = mem->map; |
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kobject_put(&map->kobj); |
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} |
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kobject_put(idev->map_dir); |
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dev_err(idev->dev, "error creating sysfs files (%d) ", ret); return ret; } static void uio_dev_del_attributes(struct uio_device *idev) { |
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int i; |
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struct uio_mem *mem; |
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struct uio_port *port; for (i = 0; i < MAX_UIO_MAPS; i++) { mem = &idev->info->mem[i]; |
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if (mem->size == 0) break; |
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kobject_put(&mem->map->kobj); |
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} |
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kobject_put(idev->map_dir); |
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for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { port = &idev->info->port[i]; if (port->size == 0) break; kobject_put(&port->portio->kobj); } kobject_put(idev->portio_dir); |
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} static int uio_get_minor(struct uio_device *idev) { |
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int retval = -ENOMEM; int id; mutex_lock(&minor_lock); if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) goto exit; retval = idr_get_new(&uio_idr, idev, &id); if (retval < 0) { if (retval == -EAGAIN) retval = -ENOMEM; goto exit; } |
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if (id < UIO_MAX_DEVICES) { idev->minor = id; } else { dev_err(idev->dev, "too many uio devices "); retval = -EINVAL; idr_remove(&uio_idr, id); } |
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exit: mutex_unlock(&minor_lock); return retval; } static void uio_free_minor(struct uio_device *idev) { |
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mutex_lock(&minor_lock); |
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idr_remove(&uio_idr, idev->minor); |
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mutex_unlock(&minor_lock); |
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} /** * uio_event_notify - trigger an interrupt event * @info: UIO device capabilities */ void uio_event_notify(struct uio_info *info) { struct uio_device *idev = info->uio_dev; atomic_inc(&idev->event); wake_up_interruptible(&idev->wait); kill_fasync(&idev->async_queue, SIGIO, POLL_IN); } EXPORT_SYMBOL_GPL(uio_event_notify); /** * uio_interrupt - hardware interrupt handler * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer * @dev_id: Pointer to the devices uio_device structure */ static irqreturn_t uio_interrupt(int irq, void *dev_id) { struct uio_device *idev = (struct uio_device *)dev_id; irqreturn_t ret = idev->info->handler(irq, idev->info); if (ret == IRQ_HANDLED) uio_event_notify(idev->info); return ret; } struct uio_listener { struct uio_device *dev; s32 event_count; }; static int uio_open(struct inode *inode, struct file *filep) { struct uio_device *idev; struct uio_listener *listener; int ret = 0; |
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mutex_lock(&minor_lock); |
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idev = idr_find(&uio_idr, iminor(inode)); |
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mutex_unlock(&minor_lock); |
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if (!idev) { ret = -ENODEV; goto out; } |
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if (!try_module_get(idev->owner)) { ret = -ENODEV; goto out; } |
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|
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listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
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if (!listener) { ret = -ENOMEM; goto err_alloc_listener; } |
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listener->dev = idev; listener->event_count = atomic_read(&idev->event); filep->private_data = listener; if (idev->info->open) { |
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ret = idev->info->open(idev->info, inode); |
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if (ret) goto err_infoopen; |
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} |
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return 0; err_infoopen: |
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kfree(listener); |
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|
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err_alloc_listener: |
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module_put(idev->owner); |
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|
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out: |
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return ret; } static int uio_fasync(int fd, struct file *filep, int on) { struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; return fasync_helper(fd, filep, on, &idev->async_queue); } static int uio_release(struct inode *inode, struct file *filep) { int ret = 0; struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; |
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if (idev->info->release) |
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ret = idev->info->release(idev->info, inode); |
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module_put(idev->owner); |
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kfree(listener); return ret; } static unsigned int uio_poll(struct file *filep, poll_table *wait) { struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; |
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if (!idev->info->irq) |
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return -EIO; poll_wait(filep, &idev->wait, wait); if (listener->event_count != atomic_read(&idev->event)) return POLLIN | POLLRDNORM; return 0; } static ssize_t uio_read(struct file *filep, char __user *buf, size_t count, loff_t *ppos) { struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; DECLARE_WAITQUEUE(wait, current); ssize_t retval; s32 event_count; |
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if (!idev->info->irq) |
beafc54c4 UIO: Add the User... |
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return -EIO; if (count != sizeof(s32)) return -EINVAL; add_wait_queue(&idev->wait, &wait); do { set_current_state(TASK_INTERRUPTIBLE); event_count = atomic_read(&idev->event); if (event_count != listener->event_count) { if (copy_to_user(buf, &event_count, count)) retval = -EFAULT; else { listener->event_count = event_count; retval = count; } break; } if (filep->f_flags & O_NONBLOCK) { retval = -EAGAIN; break; } if (signal_pending(current)) { retval = -ERESTARTSYS; break; } schedule(); } while (1); __set_current_state(TASK_RUNNING); remove_wait_queue(&idev->wait, &wait); return retval; } |
328a14e70 UIO: Add write fu... |
558 559 560 561 562 563 564 |
static ssize_t uio_write(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; ssize_t retval; s32 irq_on; |
6427a7655 uio: Cleanup irq ... |
565 |
if (!idev->info->irq) |
328a14e70 UIO: Add write fu... |
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 |
return -EIO; if (count != sizeof(s32)) return -EINVAL; if (!idev->info->irqcontrol) return -ENOSYS; if (copy_from_user(&irq_on, buf, count)) return -EFAULT; retval = idev->info->irqcontrol(idev->info, irq_on); return retval ? retval : sizeof(s32); } |
beafc54c4 UIO: Add the User... |
581 582 |
static int uio_find_mem_index(struct vm_area_struct *vma) { |
beafc54c4 UIO: Add the User... |
583 |
struct uio_device *idev = vma->vm_private_data; |
f0c554fdd uio: fix finding ... |
584 585 |
if (vma->vm_pgoff < MAX_UIO_MAPS) { if (idev->info->mem[vma->vm_pgoff].size == 0) |
beafc54c4 UIO: Add the User... |
586 |
return -1; |
f0c554fdd uio: fix finding ... |
587 |
return (int)vma->vm_pgoff; |
beafc54c4 UIO: Add the User... |
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 |
} return -1; } static void uio_vma_open(struct vm_area_struct *vma) { struct uio_device *idev = vma->vm_private_data; idev->vma_count++; } static void uio_vma_close(struct vm_area_struct *vma) { struct uio_device *idev = vma->vm_private_data; idev->vma_count--; } |
a18b630d1 uio: nopage |
603 |
static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c4 UIO: Add the User... |
604 605 |
{ struct uio_device *idev = vma->vm_private_data; |
a18b630d1 uio: nopage |
606 |
struct page *page; |
02683ffdf UIO: Fix mapping ... |
607 |
unsigned long offset; |
beafc54c4 UIO: Add the User... |
608 609 610 |
int mi = uio_find_mem_index(vma); if (mi < 0) |
a18b630d1 uio: nopage |
611 |
return VM_FAULT_SIGBUS; |
beafc54c4 UIO: Add the User... |
612 |
|
02683ffdf UIO: Fix mapping ... |
613 614 615 616 617 |
/* * We need to subtract mi because userspace uses offset = N*PAGE_SIZE * to use mem[N]. */ offset = (vmf->pgoff - mi) << PAGE_SHIFT; |
beafc54c4 UIO: Add the User... |
618 |
if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffdf UIO: Fix mapping ... |
619 |
page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c4 UIO: Add the User... |
620 |
else |
27a90700a uio: Support phys... |
621 |
page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset); |
beafc54c4 UIO: Add the User... |
622 |
get_page(page); |
a18b630d1 uio: nopage |
623 624 |
vmf->page = page; return 0; |
beafc54c4 UIO: Add the User... |
625 |
} |
f0f37e2f7 const: mark struc... |
626 |
static const struct vm_operations_struct uio_vm_ops = { |
beafc54c4 UIO: Add the User... |
627 628 |
.open = uio_vma_open, .close = uio_vma_close, |
a18b630d1 uio: nopage |
629 |
.fault = uio_vma_fault, |
beafc54c4 UIO: Add the User... |
630 631 632 633 634 635 636 637 638 639 |
}; static int uio_mmap_physical(struct vm_area_struct *vma) { struct uio_device *idev = vma->vm_private_data; int mi = uio_find_mem_index(vma); if (mi < 0) return -EINVAL; vma->vm_flags |= VM_IO | VM_RESERVED; |
c9698d6b1 UIO: add pgprot_n... |
640 641 |
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
beafc54c4 UIO: Add the User... |
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 |
return remap_pfn_range(vma, vma->vm_start, idev->info->mem[mi].addr >> PAGE_SHIFT, vma->vm_end - vma->vm_start, vma->vm_page_prot); } static int uio_mmap_logical(struct vm_area_struct *vma) { vma->vm_flags |= VM_RESERVED; vma->vm_ops = &uio_vm_ops; uio_vma_open(vma); return 0; } static int uio_mmap(struct file *filep, struct vm_area_struct *vma) { struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; int mi; unsigned long requested_pages, actual_pages; int ret = 0; if (vma->vm_end < vma->vm_start) return -EINVAL; vma->vm_private_data = idev; mi = uio_find_mem_index(vma); if (mi < 0) return -EINVAL; requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
6da2d377b UIO: Take offset ... |
676 677 |
actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; |
beafc54c4 UIO: Add the User... |
678 679 680 681 |
if (requested_pages > actual_pages) return -EINVAL; if (idev->info->mmap) { |
beafc54c4 UIO: Add the User... |
682 |
ret = idev->info->mmap(idev->info, vma); |
beafc54c4 UIO: Add the User... |
683 684 685 686 687 688 689 690 691 692 693 694 695 |
return ret; } switch (idev->info->mem[mi].memtype) { case UIO_MEM_PHYS: return uio_mmap_physical(vma); case UIO_MEM_LOGICAL: case UIO_MEM_VIRTUAL: return uio_mmap_logical(vma); default: return -EINVAL; } } |
4f0146919 UIO: constify fun... |
696 |
static const struct file_operations uio_fops = { |
beafc54c4 UIO: Add the User... |
697 698 699 700 |
.owner = THIS_MODULE, .open = uio_open, .release = uio_release, .read = uio_read, |
328a14e70 UIO: Add write fu... |
701 |
.write = uio_write, |
beafc54c4 UIO: Add the User... |
702 703 704 |
.mmap = uio_mmap, .poll = uio_poll, .fasync = uio_fasync, |
6038f373a llseek: automatic... |
705 |
.llseek = noop_llseek, |
beafc54c4 UIO: Add the User... |
706 707 708 709 |
}; static int uio_major_init(void) { |
91960a46c uio: Support 2^MI... |
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 |
static const char name[] = "uio"; struct cdev *cdev = NULL; dev_t uio_dev = 0; int result; result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); if (result) goto out; result = -ENOMEM; cdev = cdev_alloc(); if (!cdev) goto out_unregister; cdev->owner = THIS_MODULE; cdev->ops = &uio_fops; kobject_set_name(&cdev->kobj, "%s", name); result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); if (result) goto out_put; uio_major = MAJOR(uio_dev); uio_cdev = cdev; |
d80df1cea drivers:uio:chang... |
734 |
return 0; |
91960a46c uio: Support 2^MI... |
735 736 737 738 |
out_put: kobject_put(&cdev->kobj); out_unregister: unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); |
d80df1cea drivers:uio:chang... |
739 740 |
out: return result; |
beafc54c4 UIO: Add the User... |
741 742 743 744 |
} static void uio_major_cleanup(void) { |
91960a46c uio: Support 2^MI... |
745 746 |
unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); cdev_del(uio_cdev); |
beafc54c4 UIO: Add the User... |
747 748 749 750 |
} static int init_uio_class(void) { |
3d4f9d76b uio: Fix lack of ... |
751 |
int ret; |
beafc54c4 UIO: Add the User... |
752 753 754 755 756 |
/* This is the first time in here, set everything up properly */ ret = uio_major_init(); if (ret) goto exit; |
c66fdab64 uio: Statically a... |
757 758 759 760 761 |
ret = class_register(&uio_class); if (ret) { printk(KERN_ERR "class_register failed for uio "); goto err_class_register; |
beafc54c4 UIO: Add the User... |
762 763 |
} return 0; |
c66fdab64 uio: Statically a... |
764 |
err_class_register: |
beafc54c4 UIO: Add the User... |
765 766 767 768 |
uio_major_cleanup(); exit: return ret; } |
3d4f9d76b uio: Fix lack of ... |
769 |
static void release_uio_class(void) |
beafc54c4 UIO: Add the User... |
770 |
{ |
c66fdab64 uio: Statically a... |
771 |
class_unregister(&uio_class); |
beafc54c4 UIO: Add the User... |
772 |
uio_major_cleanup(); |
beafc54c4 UIO: Add the User... |
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 |
} /** * uio_register_device - register a new userspace IO device * @owner: module that creates the new device * @parent: parent device * @info: UIO device capabilities * * returns zero on success or a negative error code. */ int __uio_register_device(struct module *owner, struct device *parent, struct uio_info *info) { struct uio_device *idev; int ret = 0; if (!parent || !info || !info->name || !info->version) return -EINVAL; info->uio_dev = NULL; |
beafc54c4 UIO: Add the User... |
794 795 796 797 798 799 800 801 802 803 804 805 806 807 |
idev = kzalloc(sizeof(*idev), GFP_KERNEL); if (!idev) { ret = -ENOMEM; goto err_kzalloc; } idev->owner = owner; idev->info = info; init_waitqueue_head(&idev->wait); atomic_set(&idev->event, 0); ret = uio_get_minor(idev); if (ret) goto err_get_minor; |
c66fdab64 uio: Statically a... |
808 |
idev->dev = device_create(&uio_class, parent, |
a9b12619f device create: mi... |
809 810 |
MKDEV(uio_major, idev->minor), idev, "uio%d", idev->minor); |
beafc54c4 UIO: Add the User... |
811 812 813 814 815 816 |
if (IS_ERR(idev->dev)) { printk(KERN_ERR "UIO: device register failed "); ret = PTR_ERR(idev->dev); goto err_device_create; } |
beafc54c4 UIO: Add the User... |
817 818 819 820 821 822 |
ret = uio_dev_add_attributes(idev); if (ret) goto err_uio_dev_add_attributes; info->uio_dev = idev; |
6427a7655 uio: Cleanup irq ... |
823 824 825 |
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { ret = request_irq(info->irq, uio_interrupt, info->irq_flags, info->name, idev); |
beafc54c4 UIO: Add the User... |
826 827 828 829 830 831 832 833 834 |
if (ret) goto err_request_irq; } return 0; err_request_irq: uio_dev_del_attributes(idev); err_uio_dev_add_attributes: |
c66fdab64 uio: Statically a... |
835 |
device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c4 UIO: Add the User... |
836 837 838 839 840 |
err_device_create: uio_free_minor(idev); err_get_minor: kfree(idev); err_kzalloc: |
beafc54c4 UIO: Add the User... |
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 |
return ret; } EXPORT_SYMBOL_GPL(__uio_register_device); /** * uio_unregister_device - unregister a industrial IO device * @info: UIO device capabilities * */ void uio_unregister_device(struct uio_info *info) { struct uio_device *idev; if (!info || !info->uio_dev) return; idev = info->uio_dev; uio_free_minor(idev); |
6427a7655 uio: Cleanup irq ... |
860 |
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) |
beafc54c4 UIO: Add the User... |
861 862 863 |
free_irq(info->irq, idev); uio_dev_del_attributes(idev); |
c66fdab64 uio: Statically a... |
864 |
device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c4 UIO: Add the User... |
865 |
kfree(idev); |
beafc54c4 UIO: Add the User... |
866 867 868 869 870 871 872 |
return; } EXPORT_SYMBOL_GPL(uio_unregister_device); static int __init uio_init(void) { |
3d4f9d76b uio: Fix lack of ... |
873 |
return init_uio_class(); |
beafc54c4 UIO: Add the User... |
874 875 876 877 |
} static void __exit uio_exit(void) { |
3d4f9d76b uio: Fix lack of ... |
878 |
release_uio_class(); |
beafc54c4 UIO: Add the User... |
879 880 881 882 883 |
} module_init(uio_init) module_exit(uio_exit) MODULE_LICENSE("GPL v2"); |