CLASS_FIND_DEVICE(9) Device drivers infrastructure CLASS_FIND_DEVICE(9)NAME
class_find_device - device iterator for locating a particular device
SYNOPSIS
struct device * class_find_device(struct class * class, struct device * start, void * data, int (*match) (struct device *, void *));
ARGUMENTS
class
the class we're iterating
start
Device to begin with
data
data for the match function
match
function to check device
DESCRIPTION
This is similar to the class_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.
Note, you will need to drop the reference with put_device after use.
fn is allowed to do anything including calling back into class code. There's no locking restriction.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 CLASS_FIND_DEVICE(9)
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DEVICE_CREATE_VARGS(9) Device drivers infrastructure DEVICE_CREATE_VARGS(9)NAME
device_create_vargs - creates a device and registers it with sysfs
SYNOPSIS
struct device * device_create_vargs(struct class * class, struct device * parent, dev_t devt, void * drvdata, const char * fmt,
va_list args);
ARGUMENTS
class
pointer to the struct class that this device should be registered to
parent
pointer to the parent struct device of this new device, if any
devt
the dev_t for the char device to be added
drvdata
the data to be added to the device for callbacks
fmt
string for the device's name
args
va_list for the device's name
DESCRIPTION
This function can be used by char device classes. A struct device will be created in sysfs, registered to the specified class.
A "dev" file will be created, showing the dev_t for the device, if the dev_t is not 0,0. If a pointer to a parent struct device is passed
in, the newly created struct device will be a child of that device in sysfs. The pointer to the struct device will be returned from the
call. Any further sysfs files that might be required can be created using this pointer.
Returns struct device pointer on success, or ERR_PTR on error.
NOTE
the struct class passed to this function must have previously been created with a call to class_create.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 DEVICE_CREATE_VARGS(9)
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