Date: Thu, 10 Dec 2009 18:16:55 -0800 From: Trevor Blackwell <tlb@tlb.org> To: freebsd-usb@freebsd.org, freebsd-answers@freebsd.org Subject: USB serial device naming Message-ID: <43EC7D78-31E5-4B86-9316-002AE650727A@tlb.org>
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I cannot seem to find a way to identify serial ports. I have two
serial USB devices, which I can distinguish easily from usbconfig:
ugen2.3: <URG-Series USB Driver Hokuyo Data Flex for USB> at usbus2,
cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
ugen0.2: <USB-Serial Controller Prolific Technology Inc.> at usbus0,
cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
and they result in two ttys:
/dev/cuaU0
/dev/cuaU1
but I can't figure out how to map the USB devices to tty names.
They're assigned sequentially by a bitmap system in usb_serial.c
Currently, no devices seem to be using this mechanism:
sys/dev/usb/serial/usb_serial.c:
/* Check if the client has a custom TTY name */
if (sc->sc_callback->ucom_tty_name) {
sc->sc_callback->ucom_tty_name(sc, buf,
sizeof(buf), sc->sc_local_unit);
}
is that the right way? Or, what I really want is some sort of ioctl on
the raw USB device or usbconfig option to tell me what serial port it
appears as.
--
Trevor Blackwell 650 776 7870 tlb@tlb.org
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