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i2c-powermac: Reject unsupported I2C transactions

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The i2c-powermac driver doesn't support arbitrary multi-message I2C
transactions, only SMBus ones. Make it clear by returning an error if
a multi-message I2C transaction is attempted. This is better than only
processing the first message, because most callers won't recover from
the short transaction. Anyone wishing to issue multi-message
transactions should use the SMBus API instead of the raw I2C API.

Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Michel Daenzer <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
This commit is contained in:
Jean Delvare 2009-12-06 17:06:17 +01:00
commit 6f7e549f87
1 changed files with 6 additions and 0 deletions
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6
drivers/i2c/busses/i2c-powermac.c
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@ -146,6 +146,12 @@ static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
int read;
int addrdir;
if (num != 1) {
dev_err(&adap->dev,
"Multi-message I2C transactions not supported\n");
return -EOPNOTSUPP;
}
if (msgs->flags & I2C_M_TEN)
return -EINVAL;
read = (msgs->flags & I2C_M_RD) != 0;