i2c-algo-pcf: Add adapter hooks around xfer begin and end

Some I2C bus implementations need to synchronize with external
entities, such as system firmware, which might also be programming the
same I2C bus.

In order to facilitate this add ->xfer_begin() and ->xfer_end() hooks
which are invoked around pcf_xfer().

[JD: Make these hooks optional.]

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
index a8a5b6d..b8a6f3b 100644 (file)
--- 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 5de8a31..0f91a95 100644 (file)
--- 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