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tty: n_gsm line discipline

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Add an implementation of GSM 0710 MUX. The implementation currently supports

- Basic and advanced framing (as either end of the link)
- UI or UIH data frames
- Adaption layer 1-4 (1 and 2 via tty, 3 and 4 as skbuff lists)
- Modem and control messages including the correct retry process
- Flow control

and exposes the MUX channels as a set of virtual tty devices including modem
signals. This is an experimental driver.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-03-26 11:32:54 +00:00 • committed by Greg Kroah-Hartman
commit e1eaea46bb
5 changed files with 2798 additions and 1 deletions
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25
include/linux/gsmmux.h Normal file
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@ -0,0 +1,25 @@
#ifndef _LINUX_GSMMUX_H
#define _LINUX_GSMMUX_H
struct gsm_config
{
unsigned int adaption;
unsigned int encapsulation;
unsigned int initiator;
unsigned int t1;
unsigned int t2;
unsigned int t3;
unsigned int n2;
unsigned int mru;
unsigned int mtu;
unsigned int k;
unsigned int i;
unsigned int unused[8]; /* Padding for expansion without
breaking stuff */
};
#define GSMIOC_GETCONF _IOR('G', 0, struct gsm_config)
#define GSMIOC_SETCONF _IOW('G', 1, struct gsm_config)
#endif

1
include/linux/tty.h
View file

@ -48,6 +48,7 @@
#define N_PPS 18 /* Pulse per Second */
#define N_V253 19 /* Codec control over voice modem */
#define N_CAIF 20 /* CAIF protocol for talking to modems */
#define N_GSM0710 21 /* GSM 0710 Mux */
/*
* This character is the same as _POSIX_VDISABLE: it cannot be used as