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[PATCH] I2C: i2c-algo-pca -- gracefully handle a busy bus

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I've been running with this patch for a while now, and while I've never
seen it trigger except with buggy hardware I think it is a cleaner way
to handle a busy bus. I had -EBUSY until about 10 minutes ago but -EIO
seems to be what most of the existing algo drivers will return in the
same circumstances.

Signed-off-by: Ian Campbell <icampbell@arcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ian Campbell 2005-08-10 08:51:16 +01:00 committed by Greg Kroah-Hartman
parent cdcb192197
commit 48edcb65dd
1 changed files with 7 additions and 5 deletions
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12
drivers/i2c/algos/i2c-algo-pca.c
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@ -187,12 +187,14 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
int numbytes = 0;
int state;
int ret;
int timeout = 100;
state = pca_status(adap);
if ( state != 0xF8 ) {
dev_dbg(&i2c_adap->dev, "bus is not idle. status is %#04x\n", state );
/* FIXME: what to do. Force stop ? */
return -EREMOTEIO;
while ((state = pca_status(adap)) != 0xf8 && timeout--) {
msleep(10);
}
if (state != 0xf8) {
dev_dbg(&i2c_adap->dev, "bus is not idle. status is %#04x\n", state);
return -EIO;
}
DEB1("{{{ XFER %d messages\n", num);