* [PATCH] tty: n_gsm: add some instructions and code for slaver
@ 2021-06-18 2:31 Zhenguo Zhao
2021-06-24 13:03 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Zhenguo Zhao @ 2021-06-18 2:31 UTC (permalink / raw)
To: zhenguo6858, gregkh, jirislaby; +Cc: linux-kernel
From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
The gsm driver config to master or slaver by initiator,the config code
is different ,the doc has master instructions only,it should be add
instructions for responder.
Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
Documentation/driver-api/serial/n_gsm.rst | 67 ++++++++++++++++++++++++++-----
1 file changed, 58 insertions(+), 9 deletions(-)
diff --git a/Documentation/driver-api/serial/n_gsm.rst b/Documentation/driver-api/serial/n_gsm.rst
index 87dfcd5..8cf08c4 100644
--- a/Documentation/driver-api/serial/n_gsm.rst
+++ b/Documentation/driver-api/serial/n_gsm.rst
@@ -12,13 +12,16 @@ modems connected to a physical serial port.
How to use it
-------------
-1. initialize the modem in 0710 mux mode (usually AT+CMUX= command) through
- its serial port. Depending on the modem used, you can pass more or less
- parameters to this command,
-2. switch the serial line to using the n_gsm line discipline by using
- TIOCSETD ioctl,
-3. configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl,
-4. obtain base gsmtty number for the used serial port,
+1. config initiator
+^^^^^^^^^^^^^^^^^^^^^
+
+1.1 initialize the modem in 0710 mux mode (usually AT+CMUX= command) through
+ its serial port. Depending on the modem used, you can pass more or less
+ parameters to this command.
+1.2 switch the serial line to using the n_gsm line discipline by using
+ TIOCSETD ioctl.
+1.3 configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl.
+1.4 obtain base gsmtty number for the used serial port.
Major parts of the initialization program :
(a good starting point is util-linux-ng/sys-utils/ldattach.c)::
@@ -70,14 +73,14 @@ Major parts of the initialization program :
daemon(0,0);
pause();
-5. use these devices as plain serial ports.
+1.5 use these devices as plain serial ports.
for example, it's possible:
- and to use gnokii to send / receive SMS on ttygsm1
- to use ppp to establish a datalink on ttygsm2
-6. first close all virtual ports before closing the physical port.
+1.6 first close all virtual ports before closing the physical port.
Note that after closing the physical port the modem is still in multiplexing
mode. This may prevent a successful re-opening of the port later. To avoid
@@ -87,6 +90,52 @@ Major parts of the initialization program :
0xf9, 0x03, 0xef, 0x03, 0xc3, 0x16, 0xf9.
+2. config responter
+^^^^^^^^^^^^^^^^^^^^^
+
+2.1 switch the serial line to using the n_gsm line discipline by using
+ TIOCSETD ioctl.
+2.2 configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl.
+2.3 obtain base gsmtty number for the used serial port,
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <linux/gsmmux.h>
+ #include <linux/tty.h>
+ #define DEFAULT_SPEED B115200
+ #define SERIAL_PORT /dev/ttyS0
+
+ int ldisc = N_GSM0710;
+ struct gsm_config c;
+ struct termios configuration;
+ uint32_t first;
+
+ /* open the serial port */
+ fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
+
+ /* configure the serial port : speed, flow control ... */
+
+ /* use n_gsm line discipline */
+ ioctl(fd, TIOCSETD, &ldisc);
+
+ /* get n_gsm configuration */
+ ioctl(fd, GSMIOC_GETCONF, &c);
+ /* we are responter and need encoding 0 (basic) */
+ c.initiator = 0;
+ c.encapsulation = 0;
+ /* our modem defaults to a maximum size of 127 bytes */
+ c.mru = 127;
+ c.mtu = 127;
+ /* set the new configuration */
+ ioctl(fd, GSMIOC_SETCONF, &c);
+ /* get first gsmtty device node */
+ ioctl(fd, GSMIOC_GETFIRST, &first);
+ printf("first muxed line: /dev/gsmtty%i\n", first);
+
+ /* and wait for ever to keep the line discipline enabled */
+ daemon(0,0);
+ pause();
+
Additional Documentation
------------------------
More practical details on the protocol and how it's supported by industrial
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] tty: n_gsm: add some instructions and code for slaver
2021-06-18 2:31 [PATCH] tty: n_gsm: add some instructions and code for slaver Zhenguo Zhao
@ 2021-06-24 13:03 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2021-06-24 13:03 UTC (permalink / raw)
To: Zhenguo Zhao; +Cc: jirislaby, linux-kernel
On Fri, Jun 18, 2021 at 10:31:04AM +0800, Zhenguo Zhao wrote:
> From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
>
> The gsm driver config to master or slaver by initiator,
I do not understand.
Also, we generally do not want to use these terms anymore, please pick a
different term to use. Please see commit a5f526ecb075 ("CodingStyle:
Inclusive Terminology") in the kernel tree for more information about
this.
thanks,
greg k-h
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