i2c-algo-bit: Be verbose on bus testing failure
Jean Delvare [Sun, 30 Oct 2011 12:47:25 +0000 (13:47 +0100)]
If bus testing fails due to the bus being seen as busy, it might be
helpful for developers to know which line is unexpectedly low.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>

drivers/i2c/algos/i2c-algo-bit.c

index 66bebfc..c20530a 100644 (file)
@@ -250,7 +250,9 @@ static int test_bus(struct i2c_adapter *i2c_adap)
        sda = getsda(adap);
        scl = (adap->getscl == NULL) ? 1 : getscl(adap);
        if (!scl || !sda) {
-               printk(KERN_WARNING "%s: bus seems to be busy\n", name);
+               printk(KERN_WARNING
+                      "%s: bus seems to be busy (scl=%d, sda=%d)\n",
+                      name, scl, sda);
                goto bailout;
        }