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| author | Evgeniy Polyakov <zbr@ioremap.net> | 2009-01-07 18:09:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:14 -0800 |
| commit | 4037014e3fb71e998189374e19ca141c59d15323 (patch) | |
| tree | c422a2c48bfa7b702a5e3927475cc3cb1bffc928 /Documentation/w1 | |
| parent | f89735c4e281e8642907b38640c076ae5048f3a6 (diff) | |
| download | lwn-4037014e3fb71e998189374e19ca141c59d15323.tar.gz lwn-4037014e3fb71e998189374e19ca141c59d15323.zip | |
w1: send status messages after command processing
Send completion status of the commands to the userspace. Message and
protocol are described in the documentation.
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Paul Alfille <paul.alfille@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/w1')
| -rw-r--r-- | Documentation/w1/w1.netlink | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/w1/w1.netlink b/Documentation/w1/w1.netlink index 2756681b6ef5..804445f745ed 100644 --- a/Documentation/w1/w1.netlink +++ b/Documentation/w1/w1.netlink @@ -118,6 +118,35 @@ W1 reset command. id is equal to the bus master id to use for searching] [w1_netlink_cmd cmd = W1_CMD_RESET] + +Command status replies. +====================== + +Each command (either root, master or slave with or without w1_netlink_cmd +structure) will be 'acked' by the w1 core. Format of the reply is the same +as request message except that length parameters do not account for data +requested by the user, i.e. read/write/touch IO requests will not contain +data, so w1_netlink_cmd.len will be 0, w1_netlink_msg.len will be size +of the w1_netlink_cmd structure and cn_msg.len will be equal to the sum +of the sizeof(struct w1_netlink_msg) and sizeof(struct w1_netlink_cmd). +If reply is generated for master or root command (which do not have +w1_netlink_cmd attached), reply will contain only cn_msg and w1_netlink_msg +structires. + +w1_netlink_msg.status field will carry positive error value +(EINVAL for example) or zero in case of success. + +All other fields in every structure will mirror the same parameters in the +request message (except lengths as described above). + +Status reply is generated for every w1_netlink_cmd embedded in the +w1_netlink_msg, if there are no w1_netlink_cmd structures, +reply will be generated for the w1_netlink_msg. + +All w1_netlink_cmd command structures are handled in every w1_netlink_msg, +even if there were errors, only length mismatch interrupts message processing. + + Operation steps in w1 core when new command is received. ======================================================= |