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27 lines
1.0 KiB
27 lines
1.0 KiB
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w1_ds2406 kernel driver |
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Supported chips: |
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* Maxim DS2406 (and other family 0x12) addressable switches |
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Author: Scott Alfter <[email protected]> |
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Description |
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The w1_ds2406 driver allows connected devices to be switched on and off. |
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These chips also provide 128 bytes of OTP EPROM, but reading/writing it is |
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not supported. In TSOC-6 form, the DS2406 provides two switch outputs and |
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can be provided with power on a dedicated input. In TO-92 form, it provides |
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one output and uses parasitic power only. |
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The driver provides two sysfs files. state is readable; it gives the |
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current state of each switch, with PIO A in bit 0 and PIO B in bit 1. The |
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driver ORs this state with 0x30, so shell scripts get an ASCII 0/1/2/3 to |
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work with. output is writable; bits 0 and 1 control PIO A and B, |
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respectively. Bits 2-7 are ignored, so it's safe to write ASCII data. |
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CRCs are checked on read and write. Failed checks cause an I/O error to be |
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returned. On a failed write, the switch status is not changed.
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