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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
parent 1ff454ef9b
commit e1eaea46bb
5 changed files with 2798 additions and 1 deletions
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include/linux/tty.h
+1
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@@ -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