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w1: add missing DS2413 documentation

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Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Mariusz Bialonczyk 2017-02-23 07:38:42 +01:00 committed by Greg Kroah-Hartman
parent c2a49fe8ee
commit a9ee205883
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Documentation/w1/slaves/00-INDEX
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- This file
w1_therm
- The Maxim/Dallas Semiconductor ds18*20 temperature sensor.
w1_ds2413
- The Maxim/Dallas Semiconductor ds2413 dual channel addressable switch.
w1_ds2423
- The Maxim/Dallas Semiconductor ds2423 counter device.
w1_ds28e04

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Documentation/w1/slaves/w1_ds2413 Normal file
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Kernel driver w1_ds2413
=======================
Supported chips:
* Maxim DS2413 1-Wire Dual Channel Addressable Switch
supported family codes:
W1_FAMILY_DS2413 0x3A
Author: Mariusz Bialonczyk <manio@skyboo.net>
Description
-----------
The DS2413 chip has two open-drain outputs (PIO A and PIO B).
Support is provided through the sysfs files "output" and "state".
Reading state
-------------
The "state" file provides one-byte value which is in the same format as for
the chip PIO_ACCESS_READ command (refer the datasheet for details):
Bit 0: PIOA Pin State
Bit 1: PIOA Output Latch State
Bit 2: PIOB Pin State
Bit 3: PIOB Output Latch State
Bit 4-7: Complement of Bit 3 to Bit 0 (verified by the kernel module)
This file is readonly.
Writing output
--------------
You can set the PIO pins using the "output" file.
It is writable, you can write one-byte value to this sysfs file.
Similarly the byte format is the same as for the PIO_ACCESS_WRITE command:
Bit 0: PIOA
Bit 1: PIOB
Bit 2-7: No matter (driver will set it to "1"s)
The chip has some kind of basic protection against transmission errors.
When reading the state, there is a four complement bits.
The driver is checking this complement, and when it is wrong then it is
returning I/O error.
When writing output, the master must repeat the PIO Output Data byte in
its inverted form and it is waiting for a confirmation.
If the write is unsuccessful for three times, the write also returns
I/O error.