[PATCH] driver core: add bus_find_device & driver_find_device functions
Add bus_find_device() and driver_find_device() which allow searching for a device in the bus's resp. the driver's klist and obtain a reference on it. Signed-off-by: Cornelia Huck <cohuck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
fd782a4a99
commit
0edb586049
|
@ -177,6 +177,39 @@ int bus_for_each_dev(struct bus_type * bus, struct device * start,
|
|||
return error;
|
||||
}
|
||||
|
||||
/**
|
||||
* bus_find_device - device iterator for locating a particular device.
|
||||
* @bus: bus type
|
||||
* @start: Device to begin with
|
||||
* @data: Data to pass to match function
|
||||
* @match: Callback function to check device
|
||||
*
|
||||
* This is similar to the bus_for_each_dev() function above, but it
|
||||
* returns a reference to a device that is 'found' for later use, as
|
||||
* determined by the @match callback.
|
||||
*
|
||||
* The callback should return 0 if the device doesn't match and non-zero
|
||||
* if it does. If the callback returns non-zero, this function will
|
||||
* return to the caller and not iterate over any more devices.
|
||||
*/
|
||||
struct device * bus_find_device(struct bus_type *bus,
|
||||
struct device *start, void *data,
|
||||
int (*match)(struct device *, void *))
|
||||
{
|
||||
struct klist_iter i;
|
||||
struct device *dev;
|
||||
|
||||
if (!bus)
|
||||
return NULL;
|
||||
|
||||
klist_iter_init_node(&bus->klist_devices, &i,
|
||||
(start ? &start->knode_bus : NULL));
|
||||
while ((dev = next_device(&i)))
|
||||
if (match(dev, data) && get_device(dev))
|
||||
break;
|
||||
klist_iter_exit(&i);
|
||||
return dev;
|
||||
}
|
||||
|
||||
|
||||
static struct device_driver * next_driver(struct klist_iter * i)
|
||||
|
@ -557,6 +590,7 @@ int __init buses_init(void)
|
|||
|
||||
|
||||
EXPORT_SYMBOL_GPL(bus_for_each_dev);
|
||||
EXPORT_SYMBOL_GPL(bus_find_device);
|
||||
EXPORT_SYMBOL_GPL(bus_for_each_drv);
|
||||
|
||||
EXPORT_SYMBOL_GPL(bus_add_device);
|
||||
|
|
|
@ -55,6 +55,41 @@ int driver_for_each_device(struct device_driver * drv, struct device * start,
|
|||
EXPORT_SYMBOL_GPL(driver_for_each_device);
|
||||
|
||||
|
||||
/**
|
||||
* driver_find_device - device iterator for locating a particular device.
|
||||
* @driver: The device's driver
|
||||
* @start: Device to begin with
|
||||
* @data: Data to pass to match function
|
||||
* @match: Callback function to check device
|
||||
*
|
||||
* This is similar to the driver_for_each_device() function above, but
|
||||
* it returns a reference to a device that is 'found' for later use, as
|
||||
* determined by the @match callback.
|
||||
*
|
||||
* The callback should return 0 if the device doesn't match and non-zero
|
||||
* if it does. If the callback returns non-zero, this function will
|
||||
* return to the caller and not iterate over any more devices.
|
||||
*/
|
||||
struct device * driver_find_device(struct device_driver *drv,
|
||||
struct device * start, void * data,
|
||||
int (*match)(struct device *, void *))
|
||||
{
|
||||
struct klist_iter i;
|
||||
struct device *dev;
|
||||
|
||||
if (!drv)
|
||||
return NULL;
|
||||
|
||||
klist_iter_init_node(&drv->klist_devices, &i,
|
||||
(start ? &start->knode_driver : NULL));
|
||||
while ((dev = next_device(&i)))
|
||||
if (match(dev, data) && get_device(dev))
|
||||
break;
|
||||
klist_iter_exit(&i);
|
||||
return dev;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(driver_find_device);
|
||||
|
||||
/**
|
||||
* driver_create_file - create sysfs file for driver.
|
||||
* @drv: driver.
|
||||
|
|
|
@ -80,6 +80,8 @@ extern struct bus_type * find_bus(char * name);
|
|||
|
||||
int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
|
||||
int (*fn)(struct device *, void *));
|
||||
struct device * bus_find_device(struct bus_type *bus, struct device *start,
|
||||
void *data, int (*match)(struct device *, void *));
|
||||
|
||||
int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
|
||||
void * data, int (*fn)(struct device_driver *, void *));
|
||||
|
@ -142,6 +144,9 @@ extern void driver_remove_file(struct device_driver *, struct driver_attribute *
|
|||
|
||||
extern int driver_for_each_device(struct device_driver * drv, struct device * start,
|
||||
void * data, int (*fn)(struct device *, void *));
|
||||
struct device * driver_find_device(struct device_driver *drv,
|
||||
struct device *start, void *data,
|
||||
int (*match)(struct device *, void *));
|
||||
|
||||
|
||||
/*
|
||||
|
|
Loading…
Reference in New Issue