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<== Date ==> <== Thread ==>

Subject: Re: Linux USB serial questions
From: "J. Lewis Muir" <jlmuir@imca-cat.org>
To: Mark Rivers <rivers@cars.uchicago.edu>
Cc: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 18 Apr 2013 16:00:53 -0500
On 4/18/13 3:15 PM, Mark Rivers wrote:
>> With no /dev/ttyUSB* device files, what happens if the second device is
>> plugged in first?  
> 
> Without unplugging the devices I can unload the driver
> 
> Colorado:motor/iocBoot/iocWithAsyn>sudo modprobe -r -v ftdi_sio
> rmmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/ftdi_sio.ko
> rmmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/usbserial.ko
> 
> At this point there are no /dev/ttyUSB devices:
> Colorado:motor/iocBoot/iocWithAsyn>ls -l /dev/ttyUSB*
> ls: No match.
> 
> Now I load the driver for model 3006
> Colorado:motor/iocBoot/iocWithAsyn>sudo modprobe -v ftdi_sio vendor=0x104d product=0x3006 debug
> insmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/usbserial.ko 
> insmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/ftdi_sio.ko vendor=0x104d product=0x3006 debug
> 
> It works, and ttyUSB0 exists:
> Colorado:motor/iocBoot/iocWithAsyn>ls -l /dev/ttyUSB0
> crw-rw---- 1 root dialout 188, 0 Apr 18 15:09 /dev/ttyUSB0
> 
> Now I unload the driver again:
> Colorado:motor/iocBoot/iocWithAsyn>sudo modprobe -r -v ftdi_sio
> rmmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/ftdi_sio.ko
> rmmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/usbserial.ko
> 
> No /dev/ttyUSB devices:
> Colorado:motor/iocBoot/iocWithAsyn>ls -l /dev/ttyUSB*
> ls: No match.
> 
> Now I load the driver but for model 3000 this time:
> Colorado:motor/iocBoot/iocWithAsyn>sudo modprobe -v ftdi_sio vendor=0x104d product=0x3000 debug
> insmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/usbserial.ko 
> insmod /lib/modules/2.6.35.10-74.fc14.x86_64/kernel/drivers/usb/serial/ftdi_sio.ko vendor=0x104d product=0x3000 debug
> Colorado:motor/iocBoot/iocWithAsyn>ls -l /dev/ttyUSB*
> crw-rw---- 1 root dialout 188, 0 Apr 18 15:09 /dev/ttyUSB0
> 
> So it works.  But I don't know how to also have it recognize the second device.  As Andrew said, loading the driver again does nothing:
> Colorado:motor/iocBoot/iocWithAsyn>sudo modprobe -v ftdi_sio vendor=0x104d product=0x3006 debug
> Colorado:motor/iocBoot/iocWithAsyn>ls -l /dev/ttyUSB*
> crw-rw---- 1 root dialout 188, 0 Apr 18 15:09 /dev/ttyUSB0
> 
> I'll look into udev.

Hi, Mark.

I still think your modprobe command should work.

Do you still have your 81-Agilis.rules udev rules file loaded containing:

  SYSFS{idVendor}=="104d", ATTRS{idProduct}=="3000", MODE="0666"

What happens if you add another rule for model 3006?

  SYSFS{idVendor}=="104d", ATTRS{idProduct}=="3006", MODE="0666"

What happens if you connect both devices, but after connecting the
second, wait 60 seconds in case the /dev/ttyUSB1 file is somehow slow to
show up?

Lewis

Replies:
Re: Linux USB serial questions Jennings Guy
References:
Linux USB serial questions Mark Rivers
RE: Linux USB serial questions Mark Rivers
Re: Linux USB serial questions J. Lewis Muir
RE: Linux USB serial questions Mark Rivers

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