tree 3446d411b996b19094856c5729725e0e43ff4b0e
parent 52ab3f3dc711eeccbfbcc5d4f5c5d9b9ff59650f
author Evgeniy Polyakov <johnpol@2ka.mipt.ru> 1143130318 +0300
committer Greg Kroah-Hartman <gregkh@suse.de> 1151000570 -0700

[PATCH] w1: Added default generic read/write operations.

Special file in each w1 slave device's directory called "rw" is created
each time new slave and no appropriate w1 family is registered.
"rw" file supports read and write operations, which allows to perform
almost any kind of operations. Each logical operation is a transaction
in nature, which can contain several (two or one) low-level operations.
Let's see how one can read EEPROM context:
1. one must write control buffer, i.e. buffer containing command byte
and two byte address. At this step bus is reset and appropriate device
is selected using either W1_SKIP_ROM or W1_MATCH_ROM command.
Then provided control buffer is being written to the wire.
2. reading. This will issue reading eeprom response.

It is possible that between 1. and 2. w1 master thread will reset bus for
searching and slave device will be even removed, but in this case 0xff will
be read, since no device was selected.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>