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| author | David Brownell <david-b@pacbell.net> | 2008-07-14 22:38:25 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@mahadeva.delvare> | 2008-07-14 22:38:25 +0200 |
| commit | 97140342e69d479a3ad82bfd4c154c0b08fe3eea (patch) | |
| tree | 2ee2ad225c7e4850a30bc57c4bf07251c1da1085 /drivers/i2c/busses/i2c-ali1563.c | |
| parent | 6ea438ec8da4ec56bf415f5ea360e6b0cb59c6c3 (diff) | |
| download | talos-op-linux-97140342e69d479a3ad82bfd4c154c0b08fe3eea.tar.gz talos-op-linux-97140342e69d479a3ad82bfd4c154c0b08fe3eea.zip | |
i2c: Bus drivers return -Errno not -1
Tighten error paths used by various i2c adapters (mostly x86) so
they return real fault/errno codes instead of a "-1" (which is
most often interpreted as "-EPERM"). Build tested, with eyeball
review.
One minor initial goal is to have adapters consistently return
the code "-ENXIO" when addressing a device doesn't get an ACK
response, at least in the probe paths where they are already
good at stifling related logspam.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-ali1563.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ali1563.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/i2c/busses/i2c-ali1563.c b/drivers/i2c/busses/i2c-ali1563.c index 6b68074e518a..30bd3ee70386 100644 --- a/drivers/i2c/busses/i2c-ali1563.c +++ b/drivers/i2c/busses/i2c-ali1563.c @@ -67,6 +67,7 @@ static int ali1563_transaction(struct i2c_adapter * a, int size) { u32 data; int timeout; + int status = -EIO; dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, " "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", @@ -103,13 +104,15 @@ static int ali1563_transaction(struct i2c_adapter * a, int size) /* Issue 'kill' to host controller */ outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2); data = inb_p(SMB_HST_STS); + status = -ETIMEDOUT; } /* device error - no response, ignore the autodetection case */ - if ((data & HST_STS_DEVERR) && (size != HST_CNTL2_QUICK)) { - dev_err(&a->dev, "Device error!\n"); + if (data & HST_STS_DEVERR) { + if (size != HST_CNTL2_QUICK) + dev_err(&a->dev, "Device error!\n"); + status = -ENXIO; } - /* bus collision */ if (data & HST_STS_BUSERR) { dev_err(&a->dev, "Bus collision!\n"); @@ -122,13 +125,14 @@ static int ali1563_transaction(struct i2c_adapter * a, int size) outb_p(0x0,SMB_HST_CNTL2); } - return -1; + return status; } static int ali1563_block_start(struct i2c_adapter * a) { u32 data; int timeout; + int status = -EIO; dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, " "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", @@ -164,13 +168,20 @@ static int ali1563_block_start(struct i2c_adapter * a) if (timeout && !(data & HST_STS_BAD)) return 0; + + if (timeout == 0) + status = -ETIMEDOUT; + + if (data & HST_STS_DEVERR) + status = -ENXIO; + dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n", - timeout ? "Timeout " : "", + timeout ? "" : "Timeout ", data & HST_STS_FAIL ? "Transaction Failed " : "", data & HST_STS_BUSERR ? "No response or Bus Collision " : "", data & HST_STS_DEVERR ? "Device Error " : "", !(data & HST_STS_DONE) ? "Transaction Never Finished " : ""); - return -1; + return status; } static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw) |
