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Date: Wed, 26 Jan 2005 13:20:14 +0100
From: DervishD <lkml@dervishd.net>
To: Linux-kernel <linux-kernel@vger.kernel.org>
Cc: linux-usb-users@lists.sourceforge.net
Subject: USB API, ioctl's and libusb
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    Hi everybody :)

    I've been solving a USB problem related to a digital photo
camera, and I've noticed that 'libusb' uses a ioctl interface to the
USB kernel system. In fact it implements 'usb_control_msg()' using
ioctl's. On the other hand, the kernel itself (I'm talking about
2.4.29) provides an API in <linux/usb.h> that implements too
'usb_control_msg()' using URB's.

    My question is: which interface should be used by user space
applications, <linux/usb.h> or ioctl's? Is the ioctl interface
deprecated in any way? In the "Programming guide for Linux USB Device
Drivers", located in http://usb.in.tum.de/usbdoc/, I can't find ioctl
interface references :?

    Thanks a lot in advance :)

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736
http://www.dervishd.net & http://www.pleyades.net/
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