Am 2016-05-26 um 02:29 schrieb Dmitry Torokhov: > Hi Martin, > > On Wed, May 25, 2016 at 09:44:34AM +0200, Martin Kepplinger wrote: >> This adds a driver for the Pegasus Notetaker Pen. When connected, >> this uses the Pen as an input tablet. >> >> This device was sold in various different brandings, for example >> "Pegasus Mobile Notetaker M210", >> "Genie e-note The Notetaker", >> "Staedtler Digital ballpoint pen 990 01", >> "IRISnotes Express" or >> "NEWLink Digital Note Taker". >> >> Here's an example, so that you know what we are talking about: >> http://www.staedtler.com/en/products/ink-writing-instruments/ballpoint-pens/digital-pen-990-01-digital-ballpoint-pen >> >> http://pegatech.blogspot.com/ seems to be a remaining official resource. >> >> This device can also transfer saved (offline recorded handwritten) data and >> there are userspace programs that do this, see https://launchpad.net/m210 >> (Well, alternatively there are really fast scanners out there :) >> >> It's *really* fun to use as an input tablet though! So let's support this >> for everybody. >> >> There's no way to disable the device. When the pen is out of range, we just >> don't get any URBs and don't do anything. >> Like all other mouses or input tablets, we don't use runtime PM. >> >> Signed-off-by: Martin Kepplinger <martink@xxxxxxxxx> >> --- >> >> Thanks for having a look. Any more suggestions on this? >> >> revision history >> ================ >> v4 use normal work queue instead of a kernel thread (thanks to Oliver Neukum) >> v3 fix reporting low pen battery and add USB list to CC >> v2 minor cleanup (remove unnecessary variables) >> v1 initial release >> Hi Dmitry, thanks for the excellent review! All your suggestions seem valuable so far and I'll prepare a new version for you. >> + >> +static int pegasus_open(struct input_dev *dev) >> +{ >> + struct pegasus *pegasus = input_get_drvdata(dev); >> + >> + pegasus->irq->dev = pegasus->usbdev; > > Is this assignment really needed? > If we set URB_NO_TRANSFER_DMA_MAP and use transfer_dma, yes. thanks again, martin -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
