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-rw-r--r--drivers/i2c/algos/i2c-algo-pcf.c17
-rw-r--r--include/linux/i2c-algo-pcf.h3
2 files changed, 16 insertions, 4 deletions
diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
index a8a5b6d1dd8..b8a6f3bcbae 100644
--- a/drivers/i2c/algos/i2c-algo-pcf.c
+++ b/drivers/i2c/algos/i2c-algo-pcf.c
@@ -331,13 +331,16 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap,
int i;
int ret=0, timeout, status;
+ if (adap->xfer_begin)
+ adap->xfer_begin(adap->data);
/* Check for bus busy */
timeout = wait_for_bb(adap);
if (timeout) {
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: "
"Timeout waiting for BB in pcf_xfer\n");)
- return -EIO;
+ i = -EIO;
+ goto out;
}
for (i = 0;ret >= 0 && i < num; i++) {
@@ -359,12 +362,14 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap,
if (timeout) {
if (timeout == -EINTR) {
/* arbitration lost */
- return (-EINTR);
+ i = -EINTR;
+ goto out;
}
i2c_stop(adap);
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: Timeout waiting "
"for PIN(1) in pcf_xfer\n");)
- return (-EREMOTEIO);
+ i = -EREMOTEIO;
+ goto out;
}
#ifndef STUB_I2C
@@ -372,7 +377,8 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap,
if (status & I2C_PCF_LRB) {
i2c_stop(adap);
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: No LRB(1) in pcf_xfer\n");)
- return (-EREMOTEIO);
+ i = -EREMOTEIO;
+ goto out;
}
#endif
@@ -404,6 +410,9 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap,
}
}
+out:
+ if (adap->xfer_end)
+ adap->xfer_end(adap->data);
return (i);
}
diff --git a/include/linux/i2c-algo-pcf.h b/include/linux/i2c-algo-pcf.h
index 5de8a319bf1..0f91a957a69 100644
--- a/include/linux/i2c-algo-pcf.h
+++ b/include/linux/i2c-algo-pcf.h
@@ -33,6 +33,9 @@ struct i2c_algo_pcf_data {
int (*getclock) (void *data);
void (*waitforpin) (void *data);
+ void (*xfer_begin) (void *data);
+ void (*xfer_end) (void *data);
+
/* Multi-master lost arbitration back-off delay (msecs)
* This should be set by the bus adapter or knowledgable client
* if bus is multi-mastered, else zero