29 lines
1.3 KiB
Plaintext
29 lines
1.3 KiB
Plaintext
This directory contains the USB Tranzport and Alphatrack Kernel drivers for Linux.
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At present the tranzport does reads/writes of 8 byte cmds to /dev/tranzport0 to control
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the lights and screen and wheel
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At present the alphatrack accepts reads/writes of 12 byte cmds to /dev/tranzport0 to control
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the lights and screen and fader.
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Both drivers also have some sysfs hooks that are non-functional at the moment.
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The API is currently closely tied to the ardour revision and WILL change.
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A sysfs interface is PERFECT for simple userspace apps to do fun things with the
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lights and screen. It's fairly lousy for handling input events and very lousy
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for watching the state of the shuttle wheel.
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A linux input events interface is great for the input events and shuttle wheel. It's
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theoretically OK on LEDs. A Fader can be mapped to an absolute mouse device.
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But there is no LCD support at all.
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In the end this is going to be driven by a midi layer, which handles all those
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cases via a defined API, but - among other things - is slow, doesn't do
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flow control, and is a LOT of extra work. Frankly, I'd like to keep the
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core driver simple because the only realtime work really required is
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the bottom half interrupt handler and the output overlapping.
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Exposing some sort of clean aio api to userspace would be perfect. What that
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API looks like? Gah. beats me.
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