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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 01-22-2010, 04:31 PM   #1
jadonovan
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Single USB driver, multiple devices, how many driver instances?


Does anyone know how the system handles loading device drivers when multiple, identical devices are connected? For example, if I connect multiple USB devices are there multiple instances of the appropriate driver loaded? This has come up because I am using modprobe to load a particular USB-to-serial driver (ftdi_sio) and need to support more than one product id. I've tried just invoking modprobe ftdi_sio vendor=0xNNNN but it doesn't seem to work. Normally I do a modprobe ftdi_sio vendor=0xNNNN product=0xMMMM but I want to plug 2 different products in at one time.
 
Old 01-23-2010, 09:08 PM   #2
macemoneta
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There is only a single instance, but it should recognize all the appropriate devices. There should be no reason to specify the vendor and product under normal circumstances.
 
  


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