How to auto-load kernel module when peripheral

[Adam Lee]

On Tue, Mar 31, 2015 at 12:27:50PM +0800, Woody Wu wrote:
> Hi,
> 
> I want my usb-serial converter can be automatically ready to use after
> it plugged into an USB port.  Currently I have to manually do
> 'modprobe ftdi_sio' before use it, otherwise, no module will be loaded
> and there is no a /dev/ttyUSB0 appearing.
> 
> I am using mdev instead of udev in this embedded system, and full
> pathname of mdev had already put in /proc/sys/kernel/hotplug file.  I
> also already added a line into my mdev.conf:
>   ttyUSB*         root:tty 660
> 
> To make it clear, the problem is when I inserted the convert, I did
> not see /dev/ttyUSB0 was created and 'lsmod' also not list the
> 'ftdi_sio' module.  If I check the kernel message at the time of
> inserting the device, I can see:
> 
> [   43.425000] usb 1-1: new full speed USB device number 2 using s3c2416-ohci
> [   43.585000] usb 1-1: New USB device found, idVendor=0403, idProduct=6001
> [   43.585000] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [   43.585000] usb 1-1: Product: FT232R USB UART
> [   43.585000] usb 1-1: Manufacturer: FTDI
> [   43.585000] usb 1-1: SerialNumber: A900aMbV
> 
> How do I do?  Thanks in advance!

https://wiki.gentoo.org/wiki/Mdev#Notes

"mdev unlike udev does not support auto-modules loading thus you will
need to use /etc/conf.d/modules(depends on your distro) and put there
all the modules like you used to load."

-- 
Adam Lee
http://adam8157.info