[PATCH] I2C: i2c-algo-pca -- gracefully handle a busy bus
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>
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1 changed files with 7 additions and 5 deletions
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@ -187,12 +187,14 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
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int numbytes = 0;
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int state;
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int ret;
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int timeout = 100;
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state = pca_status(adap);
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if ( state != 0xF8 ) {
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dev_dbg(&i2c_adap->dev, "bus is not idle. status is %#04x\n", state );
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/* FIXME: what to do. Force stop ? */
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return -EREMOTEIO;
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while ((state = pca_status(adap)) != 0xf8 && timeout--) {
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msleep(10);
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}
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if (state != 0xf8) {
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dev_dbg(&i2c_adap->dev, "bus is not idle. status is %#04x\n", state);
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return -EIO;
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}
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DEB1("{{{ XFER %d messages\n", num);
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