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i2c-core: Return -Errno, not -1

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More updates to the I2C stack's fault reporting:  make the core stop
returning "-1" (usually "-EPERM") for all faults.  Instead, pass lower
level fault code up the stack, or return some appropriate errno.

This patch happens to touch almost exclusively SMBus calls.

Signed-off-by: David Brownell <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
This commit is contained in:
David Brownell 2008-07-14 22:38:23 +02:00 • committed by Jean Delvare
commit 24a5bb7b18
2 changed files with 57 additions and 48 deletions
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8
Documentation/i2c/writing-clients
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@ -598,10 +598,10 @@ be added back later if needed:
u8 command, u8 length,
u8 *values)
All these transactions return -1 on failure. The 'write' transactions
return 0 on success; the 'read' transactions return the read value, except
for read_block, which returns the number of values read. The block buffers
need not be longer than 32 bytes.
All these transactions return a negative errno value on failure. The 'write'
transactions return 0 on success; the 'read' transactions return the read
value, except for block transactions, which return the number of values
read. The block buffers need not be longer than 32 bytes.
You can read the file `smbus-protocol' for more information about the
actual SMBus protocol.