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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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9
drivers/char/Kconfig
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@ -276,11 +276,18 @@ config N_HDLC
Allows synchronous HDLC communications with tty device drivers that Allows synchronous HDLC communications with tty device drivers that
support synchronous HDLC such as the Microgate SyncLink adapter. support synchronous HDLC such as the Microgate SyncLink adapter.
This driver can only be built as a module ( = code which can be This driver can be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want). inserted in and removed from the running kernel whenever you want).
The module will be called n_hdlc. If you want to do that, say M The module will be called n_hdlc. If you want to do that, say M
here. here.
config N_GSM
tristate "GSM MUX line discipline support (EXPERIMENTAL)"
depends on EXPERIMENTAL
help
This line discipline provides support for the GSM MUX protocol and
presents the mux as a set of 61 individual tty devices.
config RISCOM8 config RISCOM8
tristate "SDL RISCom/8 card support" tristate "SDL RISCom/8 card support"
depends on SERIAL_NONSTANDARD depends on SERIAL_NONSTANDARD

1
drivers/char/Makefile
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@ -40,6 +40,7 @@ obj-$(CONFIG_SYNCLINK) += synclink.o
obj-$(CONFIG_SYNCLINKMP) += synclinkmp.o obj-$(CONFIG_SYNCLINKMP) += synclinkmp.o
obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o
obj-$(CONFIG_N_HDLC) += n_hdlc.o obj-$(CONFIG_N_HDLC) += n_hdlc.o
obj-$(CONFIG_N_GSM) += n_gsm.o
obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
obj-$(CONFIG_SX) += sx.o generic_serial.o obj-$(CONFIG_SX) += sx.o generic_serial.o
obj-$(CONFIG_RIO) += rio/ generic_serial.o obj-$(CONFIG_RIO) += rio/ generic_serial.o

2763
drivers/char/n_gsm.c Normal file
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File diff suppressed because it is too large Load Diff

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