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fs/char_dev.c
16.6 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/fs/char_dev.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
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#include <linux/init.h> #include <linux/fs.h> |
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#include <linux/kdev_t.h> |
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#include <linux/slab.h> #include <linux/string.h> #include <linux/major.h> #include <linux/errno.h> #include <linux/module.h> |
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#include <linux/seq_file.h> |
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#include <linux/kobject.h> #include <linux/kobj_map.h> #include <linux/cdev.h> |
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#include <linux/mutex.h> |
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#include <linux/backing-dev.h> |
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#include <linux/tty.h> |
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|
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#include "internal.h" |
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static struct kobj_map *cdev_map; |
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static DEFINE_MUTEX(chrdevs_lock); |
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|
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#define CHRDEV_MAJOR_HASH_SIZE 255 |
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static struct char_device_struct { struct char_device_struct *next; unsigned int major; unsigned int baseminor; int minorct; |
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char name[64]; |
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struct cdev *cdev; /* will die */ |
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} *chrdevs[CHRDEV_MAJOR_HASH_SIZE]; |
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/* index in the above */ |
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static inline int major_to_index(unsigned major) |
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{ |
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return major % CHRDEV_MAJOR_HASH_SIZE; |
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} |
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#ifdef CONFIG_PROC_FS |
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|
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void chrdev_show(struct seq_file *f, off_t offset) |
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{ struct char_device_struct *cd; |
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|
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mutex_lock(&chrdevs_lock); for (cd = chrdevs[major_to_index(offset)]; cd; cd = cd->next) { if (cd->major == offset) |
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seq_printf(f, "%3d %s ", cd->major, cd->name); |
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} |
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mutex_unlock(&chrdevs_lock); |
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} |
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#endif /* CONFIG_PROC_FS */ |
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|
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static int find_dynamic_major(void) { int i; struct char_device_struct *cd; |
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for (i = ARRAY_SIZE(chrdevs)-1; i >= CHRDEV_MAJOR_DYN_END; i--) { |
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if (chrdevs[i] == NULL) return i; } for (i = CHRDEV_MAJOR_DYN_EXT_START; |
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i >= CHRDEV_MAJOR_DYN_EXT_END; i--) { |
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for (cd = chrdevs[major_to_index(i)]; cd; cd = cd->next) if (cd->major == i) break; |
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if (cd == NULL) |
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return i; } return -EBUSY; } |
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/* * Register a single major with a specified minor range. * * If major == 0 this functions will dynamically allocate a major and return * its number. * * If major > 0 this function will attempt to reserve the passed range of * minors and will return zero on success. * * Returns a -ve errno on failure. */ static struct char_device_struct * __register_chrdev_region(unsigned int major, unsigned int baseminor, int minorct, const char *name) { struct char_device_struct *cd, **cp; int ret = 0; int i; |
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cd = kzalloc(sizeof(struct char_device_struct), GFP_KERNEL); |
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if (cd == NULL) return ERR_PTR(-ENOMEM); |
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mutex_lock(&chrdevs_lock); |
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|
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if (major == 0) { |
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ret = find_dynamic_major(); if (ret < 0) { pr_err("CHRDEV \"%s\" dynamic allocation region is full ", name); |
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goto out; } |
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major = ret; |
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} |
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if (major >= CHRDEV_MAJOR_MAX) { |
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pr_err("CHRDEV \"%s\" major requested (%u) is greater than the maximum (%u) ", name, major, CHRDEV_MAJOR_MAX-1); |
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ret = -EINVAL; goto out; } |
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cd->major = major; cd->baseminor = baseminor; cd->minorct = minorct; |
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strlcpy(cd->name, name, sizeof(cd->name)); |
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i = major_to_index(major); for (cp = &chrdevs[i]; *cp; cp = &(*cp)->next) if ((*cp)->major > major || |
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((*cp)->major == major && (((*cp)->baseminor >= baseminor) || ((*cp)->baseminor + (*cp)->minorct > baseminor)))) |
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break; |
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/* Check for overlapping minor ranges. */ if (*cp && (*cp)->major == major) { int old_min = (*cp)->baseminor; int old_max = (*cp)->baseminor + (*cp)->minorct - 1; int new_min = baseminor; int new_max = baseminor + minorct - 1; /* New driver overlaps from the left. */ if (new_max >= old_min && new_max <= old_max) { ret = -EBUSY; goto out; } /* New driver overlaps from the right. */ if (new_min <= old_max && new_min >= old_min) { ret = -EBUSY; goto out; } |
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} |
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|
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cd->next = *cp; *cp = cd; |
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mutex_unlock(&chrdevs_lock); |
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return cd; out: |
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mutex_unlock(&chrdevs_lock); |
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kfree(cd); return ERR_PTR(ret); } static struct char_device_struct * __unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct) { struct char_device_struct *cd = NULL, **cp; int i = major_to_index(major); |
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mutex_lock(&chrdevs_lock); |
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for (cp = &chrdevs[i]; *cp; cp = &(*cp)->next) if ((*cp)->major == major && (*cp)->baseminor == baseminor && (*cp)->minorct == minorct) break; if (*cp) { cd = *cp; *cp = cd->next; } |
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mutex_unlock(&chrdevs_lock); |
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return cd; } |
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/** * register_chrdev_region() - register a range of device numbers * @from: the first in the desired range of device numbers; must include * the major number. * @count: the number of consecutive device numbers required * @name: the name of the device or driver. * * Return value is zero on success, a negative error code on failure. */ |
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int register_chrdev_region(dev_t from, unsigned count, const char *name) { struct char_device_struct *cd; dev_t to = from + count; dev_t n, next; for (n = from; n < to; n = next) { next = MKDEV(MAJOR(n)+1, 0); if (next > to) next = to; cd = __register_chrdev_region(MAJOR(n), MINOR(n), next - n, name); if (IS_ERR(cd)) goto fail; } return 0; fail: to = n; for (n = from; n < to; n = next) { next = MKDEV(MAJOR(n)+1, 0); kfree(__unregister_chrdev_region(MAJOR(n), MINOR(n), next - n)); } return PTR_ERR(cd); } |
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/** * alloc_chrdev_region() - register a range of char device numbers * @dev: output parameter for first assigned number * @baseminor: first of the requested range of minor numbers * @count: the number of minor numbers required * @name: the name of the associated device or driver * * Allocates a range of char device numbers. The major number will be * chosen dynamically, and returned (along with the first minor number) * in @dev. Returns zero or a negative error code. */ |
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int alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count, const char *name) { struct char_device_struct *cd; cd = __register_chrdev_region(0, baseminor, count, name); if (IS_ERR(cd)) return PTR_ERR(cd); *dev = MKDEV(cd->major, cd->baseminor); return 0; } |
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/** |
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* __register_chrdev() - create and register a cdev occupying a range of minors |
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* @major: major device number or 0 for dynamic allocation |
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* @baseminor: first of the requested range of minor numbers * @count: the number of minor numbers required |
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* @name: name of this range of devices * @fops: file operations associated with this devices * * If @major == 0 this functions will dynamically allocate a major and return * its number. * * If @major > 0 this function will attempt to reserve a device with the given * major number and will return zero on success. * * Returns a -ve errno on failure. * * The name of this device has nothing to do with the name of the device in * /dev. It only helps to keep track of the different owners of devices. If * your module name has only one type of devices it's ok to use e.g. the name * of the module here. |
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*/ |
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int __register_chrdev(unsigned int major, unsigned int baseminor, unsigned int count, const char *name, const struct file_operations *fops) |
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{ struct char_device_struct *cd; struct cdev *cdev; |
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int err = -ENOMEM; |
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cd = __register_chrdev_region(major, baseminor, count, name); |
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if (IS_ERR(cd)) return PTR_ERR(cd); |
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|
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cdev = cdev_alloc(); if (!cdev) goto out2; cdev->owner = fops->owner; cdev->ops = fops; kobject_set_name(&cdev->kobj, "%s", name); |
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|
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err = cdev_add(cdev, MKDEV(cd->major, baseminor), count); |
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if (err) goto out; cd->cdev = cdev; return major ? 0 : cd->major; out: kobject_put(&cdev->kobj); out2: |
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kfree(__unregister_chrdev_region(cd->major, baseminor, count)); |
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return err; } |
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/** |
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* unregister_chrdev_region() - unregister a range of device numbers |
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* @from: the first in the range of numbers to unregister * @count: the number of device numbers to unregister * * This function will unregister a range of @count device numbers, * starting with @from. The caller should normally be the one who * allocated those numbers in the first place... */ |
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void unregister_chrdev_region(dev_t from, unsigned count) { dev_t to = from + count; dev_t n, next; for (n = from; n < to; n = next) { next = MKDEV(MAJOR(n)+1, 0); if (next > to) next = to; kfree(__unregister_chrdev_region(MAJOR(n), MINOR(n), next - n)); } } |
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/** * __unregister_chrdev - unregister and destroy a cdev * @major: major device number * @baseminor: first of the range of minor numbers * @count: the number of minor numbers this cdev is occupying * @name: name of this range of devices * * Unregister and destroy the cdev occupying the region described by * @major, @baseminor and @count. This function undoes what * __register_chrdev() did. */ void __unregister_chrdev(unsigned int major, unsigned int baseminor, unsigned int count, const char *name) |
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{ struct char_device_struct *cd; |
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cd = __unregister_chrdev_region(major, baseminor, count); |
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if (cd && cd->cdev) cdev_del(cd->cdev); kfree(cd); |
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} static DEFINE_SPINLOCK(cdev_lock); static struct kobject *cdev_get(struct cdev *p) { struct module *owner = p->owner; struct kobject *kobj; if (owner && !try_module_get(owner)) return NULL; kobj = kobject_get(&p->kobj); if (!kobj) module_put(owner); return kobj; } void cdev_put(struct cdev *p) { if (p) { |
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struct module *owner = p->owner; |
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kobject_put(&p->kobj); |
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module_put(owner); |
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} } /* * Called every time a character special file is opened */ |
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static int chrdev_open(struct inode *inode, struct file *filp) |
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{ |
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const struct file_operations *fops; |
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struct cdev *p; struct cdev *new = NULL; int ret = 0; spin_lock(&cdev_lock); p = inode->i_cdev; if (!p) { struct kobject *kobj; int idx; spin_unlock(&cdev_lock); kobj = kobj_lookup(cdev_map, inode->i_rdev, &idx); if (!kobj) return -ENXIO; new = container_of(kobj, struct cdev, kobj); spin_lock(&cdev_lock); |
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/* Check i_cdev again in case somebody beat us to it while we dropped the lock. */ |
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p = inode->i_cdev; if (!p) { inode->i_cdev = p = new; |
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list_add(&inode->i_devices, &p->list); new = NULL; } else if (!cdev_get(p)) ret = -ENXIO; } else if (!cdev_get(p)) ret = -ENXIO; spin_unlock(&cdev_lock); cdev_put(new); if (ret) return ret; |
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ret = -ENXIO; |
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fops = fops_get(p->ops); if (!fops) |
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goto out_cdev_put; |
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replace_fops(filp, fops); |
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if (filp->f_op->open) { |
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ret = filp->f_op->open(inode, filp); |
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if (ret) goto out_cdev_put; } return 0; out_cdev_put: cdev_put(p); |
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return ret; } void cd_forget(struct inode *inode) { spin_lock(&cdev_lock); list_del_init(&inode->i_devices); inode->i_cdev = NULL; |
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inode->i_mapping = &inode->i_data; |
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spin_unlock(&cdev_lock); } |
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static void cdev_purge(struct cdev *cdev) |
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{ spin_lock(&cdev_lock); while (!list_empty(&cdev->list)) { struct inode *inode; inode = container_of(cdev->list.next, struct inode, i_devices); list_del_init(&inode->i_devices); inode->i_cdev = NULL; } spin_unlock(&cdev_lock); } /* * Dummy default file-operations: the only thing this does * is contain the open that then fills in the correct operations * depending on the special file... */ |
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const struct file_operations def_chr_fops = { |
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.open = chrdev_open, |
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.llseek = noop_llseek, |
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}; static struct kobject *exact_match(dev_t dev, int *part, void *data) { struct cdev *p = data; return &p->kobj; } static int exact_lock(dev_t dev, void *data) { struct cdev *p = data; return cdev_get(p) ? 0 : -1; } |
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/** * cdev_add() - add a char device to the system * @p: the cdev structure for the device * @dev: the first device number for which this device is responsible * @count: the number of consecutive minor numbers corresponding to this * device * * cdev_add() adds the device represented by @p to the system, making it * live immediately. A negative error code is returned on failure. */ |
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int cdev_add(struct cdev *p, dev_t dev, unsigned count) { |
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int error; |
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p->dev = dev; p->count = count; |
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error = kobj_map(cdev_map, dev, count, NULL, exact_match, exact_lock, p); if (error) return error; kobject_get(p->kobj.parent); return 0; |
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} |
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/** * cdev_set_parent() - set the parent kobject for a char device * @p: the cdev structure * @kobj: the kobject to take a reference to * * cdev_set_parent() sets a parent kobject which will be referenced * appropriately so the parent is not freed before the cdev. This * should be called before cdev_add. */ void cdev_set_parent(struct cdev *p, struct kobject *kobj) { WARN_ON(!kobj->state_initialized); p->kobj.parent = kobj; } /** * cdev_device_add() - add a char device and it's corresponding * struct device, linkink * @dev: the device structure * @cdev: the cdev structure * * cdev_device_add() adds the char device represented by @cdev to the system, * just as cdev_add does. It then adds @dev to the system using device_add * The dev_t for the char device will be taken from the struct device which * needs to be initialized first. This helper function correctly takes a * reference to the parent device so the parent will not get released until * all references to the cdev are released. * * This helper uses dev->devt for the device number. If it is not set * it will not add the cdev and it will be equivalent to device_add. * * This function should be used whenever the struct cdev and the * struct device are members of the same structure whose lifetime is * managed by the struct device. * * NOTE: Callers must assume that userspace was able to open the cdev and * can call cdev fops callbacks at any time, even if this function fails. */ int cdev_device_add(struct cdev *cdev, struct device *dev) { int rc = 0; if (dev->devt) { cdev_set_parent(cdev, &dev->kobj); rc = cdev_add(cdev, dev->devt, 1); if (rc) return rc; } rc = device_add(dev); if (rc) cdev_del(cdev); return rc; } /** * cdev_device_del() - inverse of cdev_device_add * @dev: the device structure * @cdev: the cdev structure * * cdev_device_del() is a helper function to call cdev_del and device_del. * It should be used whenever cdev_device_add is used. * * If dev->devt is not set it will not remove the cdev and will be equivalent * to device_del. * * NOTE: This guarantees that associated sysfs callbacks are not running * or runnable, however any cdevs already open will remain and their fops * will still be callable even after this function returns. */ void cdev_device_del(struct cdev *cdev, struct device *dev) { device_del(dev); if (dev->devt) cdev_del(cdev); } |
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static void cdev_unmap(dev_t dev, unsigned count) { kobj_unmap(cdev_map, dev, count); } |
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/** * cdev_del() - remove a cdev from the system * @p: the cdev structure to be removed * * cdev_del() removes @p from the system, possibly freeing the structure * itself. |
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* * NOTE: This guarantees that cdev device will no longer be able to be * opened, however any cdevs already open will remain and their fops will * still be callable even after cdev_del returns. |
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*/ |
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void cdev_del(struct cdev *p) { cdev_unmap(p->dev, p->count); kobject_put(&p->kobj); } static void cdev_default_release(struct kobject *kobj) { struct cdev *p = container_of(kobj, struct cdev, kobj); |
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struct kobject *parent = kobj->parent; |
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cdev_purge(p); |
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kobject_put(parent); |
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} static void cdev_dynamic_release(struct kobject *kobj) { struct cdev *p = container_of(kobj, struct cdev, kobj); |
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struct kobject *parent = kobj->parent; |
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cdev_purge(p); kfree(p); |
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kobject_put(parent); |
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} static struct kobj_type ktype_cdev_default = { .release = cdev_default_release, }; static struct kobj_type ktype_cdev_dynamic = { .release = cdev_dynamic_release, }; |
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/** * cdev_alloc() - allocate a cdev structure * * Allocates and returns a cdev structure, or NULL on failure. */ |
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struct cdev *cdev_alloc(void) { |
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struct cdev *p = kzalloc(sizeof(struct cdev), GFP_KERNEL); |
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if (p) { |
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INIT_LIST_HEAD(&p->list); |
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kobject_init(&p->kobj, &ktype_cdev_dynamic); |
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} return p; } |
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/** * cdev_init() - initialize a cdev structure * @cdev: the structure to initialize * @fops: the file_operations for this device * * Initializes @cdev, remembering @fops, making it ready to add to the * system with cdev_add(). */ |
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void cdev_init(struct cdev *cdev, const struct file_operations *fops) |
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{ memset(cdev, 0, sizeof *cdev); INIT_LIST_HEAD(&cdev->list); |
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kobject_init(&cdev->kobj, &ktype_cdev_default); |
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cdev->ops = fops; } static struct kobject *base_probe(dev_t dev, int *part, void *data) { if (request_module("char-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) /* Make old-style 2.4 aliases work */ request_module("char-major-%d", MAJOR(dev)); return NULL; } void __init chrdev_init(void) { cdev_map = kobj_map_init(base_probe, &chrdevs_lock); } /* Let modules do char dev stuff */ EXPORT_SYMBOL(register_chrdev_region); EXPORT_SYMBOL(unregister_chrdev_region); EXPORT_SYMBOL(alloc_chrdev_region); EXPORT_SYMBOL(cdev_init); EXPORT_SYMBOL(cdev_alloc); EXPORT_SYMBOL(cdev_del); EXPORT_SYMBOL(cdev_add); |
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EXPORT_SYMBOL(cdev_set_parent); EXPORT_SYMBOL(cdev_device_add); EXPORT_SYMBOL(cdev_device_del); |
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EXPORT_SYMBOL(__register_chrdev); EXPORT_SYMBOL(__unregister_chrdev); |