[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>
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index cc3a952..ff2db0d 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -187,12 +187,14 @@
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);
