How to implement TIOCOUTQ for USB modem on Linux Ubuntu Post: 302526550

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Operating Systems Linux Ubuntu How to implement TIOCOUTQ for USB modem on Linux Ubuntu Post 302526550 by Corona688 on Tuesday 31st of May 2011 11:21:19 PM

06-01-2011

Registered User

Quote:

Originally Posted by SDoroshenko

All the USB modem drivers I test (cdc-acm, option, sierra) send data to modems by using usb_submit_urb call.

Of course they do. Data for USB modems gets sent over USB. The modem must have a way to inform the Linux kernel when to send data or when not to send data but this depends on the hardware.

Quote:

The facts Linux provides flow control without packet loss and sendto call blocks itself if modem buffer is full mean Linux can check if modem buffer is full

Not necessarily. For some hardware it might be the other way around -- the modem might tell Linux when the buffer is full or not full.

How it works depends on the hardware.

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LEARN ABOUT NETBSD

uslsa

USLSA(4)						   BSD Kernel Interfaces Manual 						  USLSA(4)

NAME

     uslsa -- USB support for Silicon Labs CP210x series serial adapters

SYNOPSIS

     uslsa* at uhub?
     ucom*   at uslsa?

HARDWARE

     The uslsa driver is known to work with the following adapters:

	   Siemens MC60 Data Cable
	   Suunto USB Serial Adaptor
	   Helicomm IP-Link 1220-DVM
	   Nokia CA-42 USB

DESCRIPTION

     The uslsa driver provides support for the Silicon Labs USB-to-RS-232 Bridge chip.

     The device is accessed through the ucom(4) driver which makes it behave like a tty(4).

SEE ALSO

     tty(4), ucom(4), usb(4)

     http://www.silabs.com.

     Silicon Laboratories AN571: CP210x Virtual COM Port Interface..

HISTORY

     The uslsa driver appeared in NetBSD 4.0.

AUTHORS

     The uslsa driver was written by Jonathan A. Kollasch.  Code and style was borrowed from existing NetBSD USB-serial drivers.

CAVEATS

     Settings other than 8 data bits, no parity, and 1 stop bit seem to be refused by the CP2101.

BSD
								 January 17, 2012							       BSD