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Driver Core: add nodename callbacks 

This adds the nodename callback for struct class, struct device_type and
struct device, to allow drivers to send userspace hints on the device
name and subdirectory that should be used for it.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2009-04-30 15:23:42 +02:00 committed by Greg Kroah-Hartman
parent acc0e90fbc
commit 6fcf53accc
2 changed files with 53 additions and 1 deletions
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51
drivers/base/core.c
View File

@ -162,10 +162,18 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
struct device *dev = to_dev(kobj);
int retval = 0;
/* add the major/minor if present */
/* add device node properties if present */
if (MAJOR(dev->devt)) {
const char *tmp;
const char *name;
add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
name = device_get_nodename(dev, &tmp);
if (name) {
add_uevent_var(env, "DEVNAME=%s", name);
kfree(tmp);
}
}
if (dev->type && dev->type->name)
@ -1128,6 +1136,47 @@ static struct device *next_device(struct klist_iter *i)
return dev;
}
/**
* device_get_nodename - path of device node file
* @dev: device
* @tmp: possibly allocated string
*
* Return the relative path of a possible device node.
* Non-default names may need to allocate a memory to compose
* a name. This memory is returned in tmp and needs to be
* freed by the caller.
*/
const char *device_get_nodename(struct device *dev, const char **tmp)
{
char *s;
*tmp = NULL;
/* the device type may provide a specific name */
if (dev->type && dev->type->nodename)
*tmp = dev->type->nodename(dev);
if (*tmp)
return *tmp;
/* the class may provide a specific name */
if (dev->class && dev->class->nodename)
*tmp = dev->class->nodename(dev);
if (*tmp)
return *tmp;
/* return name without allocation, tmp == NULL */
if (strchr(dev_name(dev), '!') == NULL)
return dev_name(dev);
/* replace '!' in the name with '/' */
*tmp = kstrdup(dev_name(dev), GFP_KERNEL);
if (!*tmp)
return NULL;
while ((s = strchr(*tmp, '!')))
s[0] = '/';
return *tmp;
}
/**
* device_for_each_child - device child iterator.
* @parent: parent struct device.

3
include/linux/device.h
View File

@ -194,6 +194,7 @@ struct class {
struct kobject *dev_kobj;
int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
char *(*nodename)(struct device *dev);
void (*class_release)(struct class *class);
void (*dev_release)(struct device *dev);
@ -289,6 +290,7 @@ struct device_type {
const char *name;
struct attribute_group **groups;
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
char *(*nodename)(struct device *dev);
void (*release)(struct device *dev);
struct dev_pm_ops *pm;
@ -488,6 +490,7 @@ extern struct device *device_find_child(struct device *dev, void *data,
extern int device_rename(struct device *dev, char *new_name);
extern int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order);
extern const char *device_get_nodename(struct device *dev, const char **tmp);
/*
* Root device objects for grouping under /sys/devices