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cdev: add device_find_partition 

device_find_partition allows to find a partition of a device with
a particular name.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-07-10 08:49:46 +02:00
parent 2672c906a4
commit 0ee203186d
2 changed files with 28 additions and 0 deletions
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27
fs/devfs-core.c
View File

@ -56,6 +56,33 @@ struct cdev *cdev_by_name(const char *filename)
return NULL;
}
/**
* device_find_partition - find a partition belonging to a physical device
*
* @dev: the device which should be searched for partitions
* @name: the partition name
*/
struct cdev *device_find_partition(struct device_d *dev, const char *name)
{
struct cdev *cdev;
struct device_d *child;
list_for_each_entry(cdev, &dev->cdevs, devices_list) {
if (!cdev->partname)
continue;
if (!strcmp(cdev->partname, name))
return cdev;
}
device_for_each_child(dev, child) {
cdev = device_find_partition(child, name);
if (cdev)
return cdev;
}
return NULL;
}
int cdev_find_free_index(const char *basename)
{
int i;

1
include/driver.h
View File

@ -458,6 +458,7 @@ struct cdev {
int devfs_create(struct cdev *);
int devfs_remove(struct cdev *);
int cdev_find_free_index(const char *);
struct cdev *device_find_partition(struct device_d *dev, const char *name);
struct cdev *cdev_by_name(const char *filename);
struct cdev *cdev_open(const char *name, unsigned long flags);
int cdev_do_open(struct cdev *, unsigned long flags);