DEVICE_FIND_CHILD(9) Device drivers infrastructure DEVICE_FIND_CHILD(9)NAME
device_find_child - device iterator for locating a particular device.
SYNOPSIS
struct device * device_find_child(struct device * parent, void * data, int (*match) (struct device *dev, void *data));
ARGUMENTS
parent
parent struct device
data
Data to pass to match function
match
Callback function to check device
DESCRIPTION
This is similar to the device_for_each_child 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 and a reference to the
current device can be obtained, this function will return to the caller and not iterate over any more devices.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 DEVICE_FIND_CHILD(9)
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DEVICE_SCHEDULE_CALL(9) Device drivers infrastructure DEVICE_SCHEDULE_CALL(9)NAME
device_schedule_callback_owner - helper to schedule a callback for a device
SYNOPSIS
int device_schedule_callback_owner(struct device * dev, void (*func) (struct device *), struct module * owner);
ARGUMENTS
dev
device.
func
callback function to invoke later.
owner
module owning the callback routine
DESCRIPTION
Attribute methods must not unregister themselves or their parent device (which would amount to the same thing). Attempts to do so will
deadlock, since unregistration is mutually exclusive with driver callbacks.
Instead methods can call this routine, which will attempt to allocate and schedule a workqueue request to call back func with dev as its
argument in the workqueue's process context. dev will be pinned until func returns.
This routine is usually called via the inline device_schedule_callback, which automatically sets owner to THIS_MODULE.
Returns 0 if the request was submitted, -ENOMEM if storage could not be allocated, -ENODEV if a reference to owner isn't available.
NOTE
This routine won't work if CONFIG_SYSFS isn't set! It uses an underlying sysfs routine (since it is intended for use by attribute methods),
and if sysfs isn't available you'll get nothing but -ENOSYS.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 DEVICE_SCHEDULE_CALL(9)
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