diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 9ee6162..c5ca993 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -26,6 +26,57 @@
 #ifndef V4L2_COMMON_H_
 #define V4L2_COMMON_H_
 
+/* v4l debugging and diagnostics */
+
+/* Common printk constucts for v4l-i2c drivers. These macros create a unique
+   prefix consisting of the driver name, the adapter number and the i2c
+   address. */
+#define v4l_printk(level, name, adapter, addr, fmt, arg...) \
+	printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)
+
+#define v4l_client_printk(level, client, fmt, arg...) 		     \
+	v4l_printk(level, (client)->driver->driver.name, (client)->adapter, \
+		   (client)->addr, fmt , ## arg)
+
+#define v4l_err(client, fmt, arg...) \
+	v4l_client_printk(KERN_ERR, client, fmt , ## arg)
+
+#define v4l_warn(client, fmt, arg...) \
+	v4l_client_printk(KERN_WARNING, client, fmt , ## arg)
+
+#define v4l_info(client, fmt, arg...) \
+	v4l_client_printk(KERN_INFO, client, fmt , ## arg)
+
+/* These three macros assume that the debug level is set with a module
+   parameter called 'debug'. */
+#define v4l_dbg(level, client, fmt, arg...)				     \
+	do { 								     \
+		if (debug >= (level))					     \
+			v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
+	} while (0)
+
+/* Prints the ioctl in a human-readable format */
+extern void v4l_printk_ioctl(unsigned int cmd);
+
+/* Use this macro for non-I2C drivers. Pass the driver name as the first arg. */
+#define v4l_print_ioctl(name, cmd)  		 \
+	do {  					 \
+		printk(KERN_DEBUG "%s: ", name); \
+		v4l_printk_ioctl(cmd);		 \
+	} while (0)
+
+/* Use this macro in I2C drivers where 'client' is the struct i2c_client
+   pointer */
+#define v4l_i2c_print_ioctl(client, cmd) 		   \
+	do {      					   \
+		v4l_client_printk(KERN_DEBUG, client, ""); \
+		v4l_printk_ioctl(cmd);			   \
+	} while (0)
+
+/* ------------------------------------------------------------------------- */
+
+/* Internal ioctls */
+
 /* VIDIOC_INT_G_REGISTER and VIDIOC_INT_S_REGISTER */
 struct v4l2_register {
 	u32 i2c_id; 		/* I2C driver ID of the I2C chip. 0 for the I2C adapter. */
@@ -122,16 +173,4 @@
    If the frequency is not supported, then -EINVAL is returned. */
 #define VIDIOC_INT_I2S_CLOCK_FREQ 	_IOW ('d', 108, u32)
 
-/* Prints used ioctl */
-extern void v4l_printk_ioctl(unsigned int cmd);
-
-#define v4l_print_ioctl(name,cmd) do {\
-	printk(KERN_DEBUG "%s: ", name); \
-	v4l_printk_ioctl(cmd); } while (0)
-
-#define v4l_i2c_print_ioctl(client,cmd) do {\
-	printk(KERN_DEBUG "%s %d-%04x: ", (client)->driver->name, \
-			i2c_adapter_id((client)->adapter),(client)->addr); \
-	v4l_printk_ioctl(cmd); } while (0)
-
 #endif /* V4L2_COMMON_H_ */