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i2c: add suspended flag and accessors for i2c adapters

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A few drivers open code the handling of suspended adapters. It could be
handled by the core, though, to ensure generic handling. This patch adds
the flag and accessor functions. The usage of these helpers is optional,
though. See the kerneldoc in this patch. Using the new flag, we now
reject further transfers if the adapter is already marked suspended.

Signed-off-by: Wolfram Sang <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
This commit is contained in:
Wolfram Sang 2018-12-19 17:48:17 +01:00 • committed by Wolfram Sang
commit 9ac6cb5fbb
3 changed files with 41 additions and 0 deletions
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4
Documentation/i2c/fault-codes
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@ -112,6 +112,10 @@ EPROTO
case is when the length of an SMBus block data response
(from the SMBus slave) is outside the range 1-32 bytes.
ESHUTDOWN
Returned when a transfer was requested using an adapter
which is already suspended.
ETIMEDOUT
This is returned by drivers when an operation took too much
time, and was aborted before it completed.