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Query about creating sysfs directory under device driver


 
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Operating Systems Linux Query about creating sysfs directory under device driver
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Old 02-18-2009
CPU & Memory Query about creating sysfs directory under device driver

Hi all,

Currently i am involved in developing a device driver for a custom hardware.

My linux stack already has the sysfs directory structure

/sys/class/hwmon/

My need is that, while loading my device driver i need to create a "xyz" sysfs directory inside hwmon sysfs directory as shown below

/sys/class/hwmon/xyz/

I came across a function called class_create_file call using which we can able to create a sysfs file. But, I don't know about a way to create sysfs directory. Smilie

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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 2.6. July 2010 DEVICE_CREATE_VARGS(9)

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