xref: /freebsd/sys/dev/ow/README.txt (revision 783d3ff6d7fae619db8a7990b8a6387de0c677b5)
1Quick Design Document for 1-wire bus
2
3In new bus terms, 1-wire devices are attached to 1-wire buses (ow)
4which are attached to a one wire bridge (owc).
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6The implementation follows the terminology used in the Maxim AN927
7Application note which defines the 1-wire bus as implemented for the
8iButton product. This is considered to be the canonical definition of
9the 1-wire bus. This means that the 1-wire bridge will implement the
10owll(9) interface. ow is one wire. ll is for Link Level to mirror the ISO
11stack terminology used by AN927. The 1-wire bus is implemented in the ow(4)
12device, which implements the own(9) interface (n for network, the layer
13described in the AN927). The presentation layer and above is the
14responsibility of the client device drivers to implement.
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16Client drivers may only call the own(9) interface. The ow(4) driver
17calls the owll(9) interface and implements the own(9).
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