Hello,
Currently the i2c
</snippet>
* Returns negative errno, else the number of messages executed.
*
* Note that there is no requirement that each message be sent to
* the same slave address, although that is the most common model.
*/
int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
unsigned long orig_jiffies;
int ret, try;
/* REVISIT the fault reporting model here is weak:
*
* - When we get an error after receiving N bytes from a slave,
* there is no way to report "N".
*
* - When we get a NAK after transmitting N bytes to a slave,
* there is no way to report "N" ... or to let the master
* continue executing the rest of this combined message, if
* that's the appropriate response.
*
* - When for example "num" is two and we successfully complete
* the first message but get an error part way through the
* second, it's unclear whether that should be reported as
* one (discarding status on the second message) or errno
* (discarding status on the first one).
*/
</end>
Some of the drivers expect to get the no of bytes transmitted on NACK
so that they can
re-transmit the remaining bytes.
I did a quick search and didnt find a patch that currently targets to
resend the number of bytes.
In case I missed a discussion please feel free to point.
Will it be acceptable solution if
if (ret == NOERR)
return count
if (ret == NACKERR)
return no_of_bytes;
else
return ret;
Or are there better suggestions to achieve it by _not_changing existing drivers.
Thanks and Regards,
Shubhro
--
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
