V4L/DVB (5884): zr36067: clean up debug function

Debugging cleanups to the zr36067 driver:

* Use module_param_named() to declare the debug parameter, so we can
  use a single global variable to handle the debug level. This makes
  the driver a bit smaller (by 648 bytes on x86_64), thanks to one
  less level of indirection on every use.

* Change the debug parameter sysfs permissions, so that the debug
  level can be adjusted at runtime, as is done in many other
  media/video drivers.

* The debug level is between 0 and 5, not 0 and 4.

* Move the zr_debug export and dprintk macro definition to a header
  file so that we don't have to define them in each source file.

* Simplify a duplicate test on zr_debug.

Note that zr_debug was subsequently renamed to debug_zr36067 to avoid
possible conflicts with other Zoran device drivers, on a suggestion
by Trent Piepho.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Acked-by: Ronald S. Bultje <rbultje@ronald.bitfreak.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/media/video/zoran_card.h b/drivers/media/video/zoran_card.h
index ad997c30bee5..8444ca0a5f3f 100644
--- a/drivers/media/video/zoran_card.h
+++ b/drivers/media/video/zoran_card.h
@@ -30,6 +30,14 @@
 #ifndef __ZORAN_CARD_H__
 #define __ZORAN_CARD_H__
 
+extern int zr36067_debug;
+
+#define dprintk(num, format, args...) \
+	do { \
+		if (zr36067_debug >= num) \
+			printk(format, ##args); \
+	} while (0)
+
 /* Anybody who uses more than four? */
 #define BUZ_MAX 4
 extern int zoran_num;