CLASS_FOR_EACH_DEVIC(9) Device drivers infrastructure CLASS_FOR_EACH_DEVIC(9)NAME
class_for_each_device - device iterator
SYNOPSIS
int class_for_each_device(struct class * class, struct device * start, void * data, int (*fn) (struct device *, void *));
ARGUMENTS
class
the class we're iterating
start
the device to start with in the list, if any.
data
data for the callback
fn
function to be called for each device
DESCRIPTION
Iterate over class's list of devices, and call fn for each, passing it data. If start is set, the list iteration will start there,
otherwise if it is NULL, the iteration starts at the beginning of the list.
We check the return of fn each time. If it returns anything other than 0, we break out and return that value.
fn is allowed to do anything including calling back into class code. There's no locking restriction.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 CLASS_FOR_EACH_DEVIC(9)
Check Out this Related Man Page
DEVICE_CREATE(9) Device drivers infrastructure DEVICE_CREATE(9)NAME
device_create - creates a device and registers it with sysfs
SYNOPSIS
struct device * device_create(struct class * class, struct device * parent, dev_t devt, void * drvdata, const char * fmt, ...);
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
...
variable arguments
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 2.6. July 2010 DEVICE_CREATE(9)
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