On Wed, Mar 11, 2009 at 06:01:45AM -0400, Dan Williams wrote: > On Tue, 2009-03-10 at 22:02 -0700, Greg KH wrote: > > On Mon, Mar 09, 2009 at 04:15:01PM -0400, Dan Williams wrote: > > > > I see what you are trying to solve here, however, you are just pushing > > > > the need to create this table from userspace, into the kernel. While > > > > this is nice from a userspace point of view, I thought that this is what > > > > the modem-id userspace tool was trying to do. What's wrong with that? > > > > > > The 'modem-probe' tool detects whether the tty supports AT commands. > > > But the attributes we're talking about aren't exposed through AT command > > > sets or by querying the modem. They are artifacts of firmware or modem > > > design in most cases, where only one port returns unsolicited response > > > codes. > > > > Ah, yeah, true. > > > > > So say you've got an Option Globetrotter; it exposes ttyUSB0 and > > > ttyUSB1, and ttyUSB2. USB0 and USB1 accept AT commands, thus the modem > > > prober tags them as such. USB2 is a proprietary interface that is not > > > supported Linux, and so it's not tagged by the modem prober. > > > > Qualcom did this right and only asked to expose the single port to > > Linux. It uses usbfs and libusb to dump data to the other ports if > > needed. > > Only if Qualcomm provides documentation for their protocols on the other > ports. Do we have that? No, I've not seen that. And why would that be the "only" right thing? They expose the needed modem port through the driver. They then use userspace programs to poke around in other parts of the device if they feel they need to (downloading firmware depending on the carrier used is what I see happening). They don't have to expose that in the kernel driver or even document the thing if they don't want to, it's not keeping Linux users from using the modem properly. thanks, 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
