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Subject[PATCH 10/30] W1: Document add, remove, search_count, and pullup.
Document w1_master_add, w1_master_remove, search_count, and pullup.

Signed-off-by: David Fries <>
Signed-off-by: Evgeniy Polyakov <>
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
- 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)
- 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

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