On Wed, 2009-03-11 at 08:52 -0700, Greg KH wrote: > 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. Yes, it *is* becuase you can't talk on the AT-capable port when you're using it for data with PPP. So no signal strength while connected for you. There's a number of quite desirable features that are usually exposed via AT commands, and if you don't have either a second AT-capable port, or (like SonyEricsson F3507g or Option 'hso') a network device, you can't get that sort of thing. Dan -- 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
