linux-kernel - [PATCH 12/33 replaces 13/35] W1: Document add, remove, search

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Date:	Sun, 13 Apr 2008 18:15:17 -0500
From:	David Fries <david@...es.net>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 12/33 replaces 13/35] W1: Document add, remove, search_count, and pullup.

===================================================================
This is an update to the previous set of patches, don't merge them
yet.  Some of the context was messed up and I don't expect patch to
apply the updates with the previous set cleanly.  I'll resubmit the
entire set if these updates look good.
===================================================================

Documentation/w1/w1.generic 1.2 1.3
Document w1_master_add, w1_master_remove, search_count, and pullup.

Signed-off-by: David Fries <david@...es.net>
---
 Documentation/w1/w1.generic |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/Documentation/w1/w1.generic b/Documentation/w1/w1.generic
index 4c6509d..e3333ee 100644
--- a/Documentation/w1/w1.generic
+++ b/Documentation/w1/w1.generic
@@ -79,10 +79,13 @@ w1 master sysfs interface
 <xx-xxxxxxxxxxxxx> - a directory for a found device. The format is family-serial
 bus                - (standard) symlink to the w1 bus
 driver             - (standard) symlink to the w1 driver
+w1_master_add      - Manually register a slave device
 w1_master_attempts - the number of times a search was attempted
 w1_master_max_slave_count
                    - the maximum slaves that may be attached to a master
 w1_master_name     - the name of the device (w1_bus_masterX)
+w1_master_pullup   - 5V strong pullup 0 enabled, 1 disabled
+w1_master_remove   - Manually remove a slave device
 w1_master_search   - the number of searches left to do, -1=continual (default)
 w1_master_slave_count
                    - the number of slaves found
@@ -90,7 +93,13 @@ w1_master_slaves   - the names of the slaves, one per line
 w1_master_timeout  - the delay in seconds between searches
 
 If you have a w1 bus that never changes (you don't add or remove devices),
-you can set w1_master_search to a positive value to disable searches.
+you can set the module parameter search_count to a small positive number
+for an initially small number of bus searches.  Alternatively it could be
+set to zero, then manually add the slave device serial numbers by
+w1_master_add device file.  The w1_master_add and w1_master_remove files
+generally only make sense when searching is disabled, as a search will
+redetect manually removed devices that are present and timeout manually
+added devices that aren't on the bus.
 
 
 w1 slave sysfs interface
-- 
1.4.4.4

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