Merge branch '2.6.33.4' into rt/2.6.33

Conflicts:
	Makefile

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 16 insertions, 5 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 10be7b5fbe97..855911ebdb4d 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1210,12 +1210,23 @@ static int i2c_detect_address(struct i2c_client *temp_client,
                 return 0;
 
         /* Make sure there is something at this address */
-        if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) < 0)
-                return 0;
+        if (addr == 0x73 && (adapter->class & I2C_CLASS_HWMON)) {
+                /* Special probe for FSC hwmon chips */
+                union i2c_smbus_data dummy;
 
-        /* Prevent 24RF08 corruption */
-        if ((addr & ~0x0f) == 0x50)
-                i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL);
+                if (i2c_smbus_xfer(adapter, addr, 0, I2C_SMBUS_READ, 0,
+                                   I2C_SMBUS_BYTE_DATA, &dummy) < 0)
+                        return 0;
+        } else {
+                if (i2c_smbus_xfer(adapter, addr, 0, I2C_SMBUS_WRITE, 0,
+                                   I2C_SMBUS_QUICK, NULL) < 0)
+                        return 0;
+
+                /* Prevent 24RF08 corruption */
+                if ((addr & ~0x0f) == 0x50)
+                        i2c_smbus_xfer(adapter, addr, 0, I2C_SMBUS_WRITE, 0,
+                                       I2C_SMBUS_QUICK, NULL);
+        }
 
         /* Finally call the custom detection function */
         memset(&info, 0, sizeof(struct i2c_board_info));