CODEWITHSUNDEEP
clinuxusbdriverioctl
Kallel Omar
Kallel Omar

Reputation: 1218

USB Linux API: call ioctl requests from user space app

I want to create Linux app responsible to get/set some usb settings especially settings responsible of followings:

I followed the linux api document: https://www.kernel.org/doc/html/v4.14/driver-api/usb/usb.html I found that it can be done through ioctl I found a list of ioctl requests, for example USBDEVFS_GETDRIVER.

I found that if I want a first small test it can be like that:

struct usbdevfs_getdriver usbdriver;
int fd = open("device_file_name", O_RDWR);
ioctl(fd, USBDEVFS_GETDRIVER, (struct usbdevfs_getdriver*) &usbdriver);

Is that the right way? What should be the device_file_name in the second line of my code?

Upvotes: 2

Views: 1247

Answers (2)

Feten Besbes
Feten Besbes

Reputation: 306

The device_file_name: should be the file where usb is mounted. In general it is under /mnt/. You can use command dmesg.

Upvotes: 0

David Grayson
David Grayson

Reputation: 87486

The string device_file_name should be replaced with the path to a USB device node file. The document you mentioned explains that the path to such a file looks like /dev/bus/usb/BBB/DDD.

You should check the values returned by both open and ioctl to see if the operations succeeded.

Upvotes: 1

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