[mythtv-users] lirc woes with serial_ir kernel module

[Stuart Auchterlonie]

On 01/06/17 23:19, Richard Shaw wrote:
> At some point Fedora dropped the lirc_serial module in favor of the
> serial_ir module and while I can make it work, I haven't found the right
> incantation to make it work on boot without manual intervention.
> 
> My initial attempts were to update /etc/modprobe.d/lirc.conf to:
> 
> # Lirc module settings, /dev/ttyS0
> options serial_ir type=0 irq=4 io=0x3f8
> 
> Unfortuantely it won't work properly on boot because "setserial
> /dev/ttyS0 uart none" needs to be run first, otherwise you get:
> 
> # dmesg | grep serial_ir
> [    1.730353] serial_ir serial_ir.0: port 03f8 already in use
> [    1.730399] serial_ir serial_ir.0: use 'setserial /dev/ttySX uart none'
> [    1.730400] serial_ir serial_ir.0: or compile the serial port driver
> as module and
> [    1.730401] serial_ir serial_ir.0: make sure this module is loaded first
> [    1.730412] serial_ir: probe of serial_ir.0 failed with error -16
> 
> I tried adding the setserial command to /etc/sysconfig/modules but I'm
> guessing it doesn't run early enough in the process (I assume the
> serial_ir module is loaded from the initrd before setserial is even
> available).
> 

There is an `install` option you can use in the modprobe configuration
which allows you to specify what to run.

In this case you could use it to first run setserial, and then modprobe
serial_ir

see `man modprobe.conf` for details


Regards
Stuart

> I've also tried using the code lines for lirc in lirc_options.conf to
> replicate the needed order but it doesn't seem to actually get run:
> 
> [modinit]
> code1 = /usr/sbin/rmmod serial_ir
> code1 = /usr/bin/setserial /dev/ttyS0 uart none
> code2 = /usr/sbin/modprobe serial_ir
> 
> So now every time I reboot my frontend I have to manually perform the
> above commands prior to starting lircd or I don't get a working remote.
> 
> Any ideas?
> 
> Thanks,
> Richard
> 
> 
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