Greg KH wrote: > On Tue, May 15, 2012 at 09:20:14AM +0200, Martin Mokrejs wrote: >> Greg KH wrote: >>> On Mon, May 14, 2012 at 06:05:52PM +0000, Russell Nelson wrote: >>>> Greg KH <gregkh@...> writes: >> >>>> Well, I say that it works because I can see a /dev/ttyUSB0, but I can't set the >>>> baud rate to 4800. But that may be a completely separate problem. >>> >>> There is no way to set a baud rate for a generic usb-serial device, it's >>> physically impossible. So perhaps it is working just fine for you :) >>> >>> Again the usb-serial generic device is a very dumb, slow device, with no >>> line settings at all. It's ment for testing and one-off prototypes, not >>> for "real" devices in any way. >> >> Is this about the second top-most menu entry? >> >> --- USB Serial Converter support >> -*- Functions for loading firmware on EZUSB chips >> [*] USB Generic Serial Driver > > Yes. > >> CONFIG_USB_SERIAL_GENERIC: >> Say Y here if you want to use the generic USB serial driver. Please >> read <file:Documentation/usb/usb-serial.txt> for more information on >> using this driver. It is recommended that the "USB Serial converter >> support" be compiled as a module for this driver to be used properly. > > Yes, this is the one. The menuconfig help text should really be updated and more descriptive. And the 4800 baud rate highlighted. How about renaming CONFIG_USB_SERIAL_GENERIC to CONFIG_USB_SERIAL_GENERIC_AT_4800_BAUDRATE_ONLY? As the old entry will disappear people will realize the change, hopefully figure out they should use qmi_wwan or similar ;-) And the usbserial will be maybe gone from broad use? > >> Or is it about the parent? >> >> CONFIG_USB_SERIAL: >> >> Say Y here if you have a USB device that provides normal serial >> ports, or acts like a serial device, and you want to connect it to >> your USB bus. >> >> Please read <file:Documentation/usb/usb-serial.txt> for more >> information on the specifics of the different devices that are >> supported, and on how to use them. >> >> To compile this driver as a module, choose M here: the >> module will be called usbserial. >> >> Symbol: USB_SERIAL >> Type: tristate >> Prompt: USB Serial Converter support >> >> >> >> >> >> Could the documenting text be made more clear that this is not really >> something to be generally enabled? I probably felt into the same trap >> as well. It is puzzling that there are so many devcies listed after the >> "USB Generic Serial Driver" ... What am I getting wrong? > > The other devices listed afterward are different drivers, nothing wrong > there. > > And distros enable this driver as it is useful for a number of people, > so that's not the problem. I read the Documentation/usb/usb-serial.txt and not even that says anything about 4800 speed of the usbserial driver (mentions that incidentally in some other section but does not seems to be generally applicable). > > The problem is companies who somehow think this is a valid driver for > their high-speed devices, and write web pages showing this. Over time, > this stops being an issue as their device ids get incorporated into the > kernel, and all is good, but it can be annoying. I think this should be really named like testing, 480bps driver. > > Hope this helps, Sure, thanks. Now to rip away usage of this module from all Linux distros, home routers, firewalls, etc. Impossible. > > greg k-h > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
