39 lines · plain
1===========2Metronomefb3===========4 5Maintained by Jaya Kumar <jayakumar.lkml.gmail.com>6 7Last revised: Mar 10, 20088 9Metronomefb is a driver for the Metronome display controller. The controller10is from E-Ink Corporation. It is intended to be used to drive the E-Ink11Vizplex display media. E-Ink hosts some details of this controller and the12display media here http://www.e-ink.com/products/matrix/metronome.html .13 14Metronome is interfaced to the host CPU through the AMLCD interface. The15host CPU generates the control information and the image in a framebuffer16which is then delivered to the AMLCD interface by a host specific method.17The display and error status are each pulled through individual GPIOs.18 19Metronomefb is platform independent and depends on a board specific driver20to do all physical IO work. Currently, an example is implemented for the21PXA board used in the AM-200 EPD devkit. This example is am200epd.c22 23Metronomefb requires waveform information which is delivered via the AMLCD24interface to the metronome controller. The waveform information is expected to25be delivered from userspace via the firmware class interface. The waveform file26can be compressed as long as your udev or hotplug script is aware of the need27to uncompress it before delivering it. metronomefb will ask for metronome.wbf28which would typically go into /lib/firmware/metronome.wbf depending on your29udev/hotplug setup. I have only tested with a single waveform file which was30originally labeled 23P01201_60_WT0107_MTC. I do not know what it stands for.31Caution should be exercised when manipulating the waveform as there may be32a possibility that it could have some permanent effects on the display media.33I neither have access to nor know exactly what the waveform does in terms of34the physical media.35 36Metronomefb uses the deferred IO interface so that it can provide a memory37mappable frame buffer. It has been tested with tinyx (Xfbdev). It is known38to work at this time with xeyes, xclock, xloadimage, xpdf.39