How to implement TIOCOUTQ for USB modem on Linux Ubuntu Post: 302526771

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Operating Systems Linux Ubuntu How to implement TIOCOUTQ for USB modem on Linux Ubuntu Post 302526771 by Corona688 on Wednesday 1st of June 2011 12:17:18 PM

06-01-2011

Registered User

Quote:

Originally Posted by SDoroshenko

Looks like I'd have to ask modem manufacturers if their modems can return how much data are inside modem buffer....

Or read and understand the device driver source code. That's likely to be quite difficult unfortunately.

If these are binary drivers without source code, you're wholly out of luck.

Quote:

usb_submit_urb puts data to HCD (Host Controller Driver). Does HCD put data to device directly, or it transfers data to the next level of Linux kernel?

Transfers it to the USB drivers. USB has its own protocol, etc. quite unrelated to whatever serial buffers the device might have.

What do you need TIOCOUTQ for? Might there be a workaround that doesn't involve bare-metal hardware driver hacking?

Corona688

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LEARN ABOUT FREEBSD

usb_template

USB_TEMPLATE(4) 					   BSD Kernel Interfaces Manual 					   USB_TEMPLATE(4)

NAME

     usb_template -- USB templates

SYNOPSIS

     To compile this module into the kernel, place the following line in your kernel configuration file:

	   device usb_template

     To load the module at boot time, place the following line in loader.conf(5):

	   usb_template_load="YES"

DESCRIPTION

     The usb_template module implements various USB templates that are needed when programming an USB device side driver.  A USB template consists
     of an USB device descriptor, one or more USB configuration descriptors, one or more USB interface descriptors, one or more USB endpoint
     descriptors, USB strings and additional USB descriptors.  The USB template module currently has templates for USB Mass Storage, USB CDC Eth-
     ernet and Message Transfer Protocol.  USB templates are currently selected using the "hw.usb.template" sysctl.  The "hw.usb.template" value
     can be changed at any time, but will not have any effect until the USB device has been re-enumerated.

SEE ALSO

     usb(4)

STANDARDS

     The usb_template module complies to the USB 1.0, 2.0 and 3.0 standard.

HISTORY

     The usb_template module was written by Hans Petter Selasky <hselasky@FreeBSD.org>.

BSD
								  March 18, 2014							       BSD