Log errors when they happen, otherwise we have no idea what went
wrong.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
---
drivers/i2c/busses/i2c-powermac.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
--- linux-2.6.32-rc3.orig/drivers/i2c/busses/i2c-powermac.c 2009-10-10 14:13:04.000000000 +0200
+++ linux-2.6.32-rc3/drivers/i2c/busses/i2c-powermac.c 2009-10-10 14:13:12.000000000 +0200
@@ -108,16 +108,25 @@ static s32 i2c_powermac_smbus_xfer( stru
}
rc = pmac_i2c_open(bus, 0);
- if (rc)
+ if (rc) {
+ dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
return rc;
+ }
rc = pmac_i2c_setmode(bus, mode);
- if (rc)
+ if (rc) {
+ dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
+ mode, rc);
goto bail;
+ }
rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
- if (rc)
+ if (rc) {
+ dev_err(&adap->dev,
+ "I2C transfer at 0x%02x failed, size %d, err %d\n",
+ addrdir >> 1, size, rc);
goto bail;
+ }
if (size == I2C_SMBUS_WORD_DATA && read) {
data->word = ((u16)local[1]) << 8;
@@ -157,12 +166,21 @@ static int i2c_powermac_master_xfer( str
addrdir ^= 1;
rc = pmac_i2c_open(bus, 0);
- if (rc)
+ if (rc) {
+ dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
return rc;
+ }
rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
- if (rc)
+ if (rc) {
+ dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
+ pmac_i2c_mode_std, rc);
goto bail;
+ }
rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
+ if (rc < 0)
+ dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
+ addrdir & 1 ? "read from" : "write to", addrdir >> 1,
+ rc);
bail:
pmac_i2c_close(bus);
return rc < 0 ? rc : 1;
--
Jean Delvare
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
