diff options
| author | Ian Campbell <icampbell@arcom.com> | 2005-08-10 11:51:16 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-09-05 20:14:15 +0400 |
| commit | 48edcb65ddcd93b6421831ad133599aacea9724a (patch) | |
| tree | 8897c3568fc5f6651fa0ddb80d7e60a8ca2adef4 /drivers/i2c/algos/i2c-algo-pca.c | |
| parent | cdcb19219714c796ddef1202e952566c5f86354d (diff) | |
| download | linux-48edcb65ddcd93b6421831ad133599aacea9724a.tar.xz | |
[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>
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-pca.c')
| -rw-r--r-- | drivers/i2c/algos/i2c-algo-pca.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c index cc3a952401f2..ff2db0da4417 100644 --- a/drivers/i2c/algos/i2c-algo-pca.c +++ b/drivers/i2c/algos/i2c-algo-pca.c @@ -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); |