On 05/27/2015, 03:27 PM, Jiří Prchal wrote:
>
>
> On 27.5.2015 14:59, Greg KH wrote:
>> On Wed, May 27, 2015 at 02:45:47PM +0200, Jiří Prchal wrote:
>>> Hi,
>>>
>>> I've tried n_gsm to get up working. Is this in working condition?
>>> Trying kernel 4.1-rc5.
>>>
>>> I made program as example in Documentation/serial/n_gsm.txt. Nodes
>>> are made
>>> by mdev (too many 0 - 63). Or if I disable mdev then I made by program 4
>>> nodes. Up to here looks everything OK.
...
> Here are functions called in this sequence:
...
> /* get n_gsm configuration */
> if (ioctl (tty, GSMIOC_GETCONF, &conf)) {
> syslog (LOG_ERR, "cannot get configuration!");
> exit (-1);
> }
> /* we are initiator and need encoding 0 (basic) */
> conf.initiator = 1;
> conf.encapsulation = 0;
> /* our modem defaults to a maximum size of 98 bytes */
> conf.mru = 96;
> conf.mtu = 96;
> /* set the new configuration */
> if (ioctl (tty, GSMIOC_SETCONF, &conf)) {
> syslog (LOG_ERR, "cannot configure line discipline!");
> exit (-1);
> }
The suspect is here. The modem did not reply to the configuration, so
the device was marked as dead.
> int
> at_open (char *dev)
> {
> int tty;
>
> tty = open (dev, O_RDWR | O_NOCTTY);
Every open of the node then ends up with -EL2HLT.
You can check with the debug parameter of n_gsm module. Set it to 1 or
5. You might need to turn on the dynamic_debug due to pr_debug.
> if (tty < 0) {
> syslog (LOG_ERR, "unable to open %s, code %d (%s)", dev, errno,
> strerror (errno));
thanks,
--
js
suse labs
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