W1: Document add, remove, search_count, and pullup.

<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

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