wl12xx: allow runtime changing of debug_level

Currently, the debug level is set in compilation time (by the DEBUG_LEVEL
const). This method has the advantage of compiling only the relevant
messages, while optimizing out the unused ones.

In order to allow runtime control over the debug_level, while optimizing
out messages when debug messages are not needed, we combine some methods:
1. use dynamic_debug (pr_debug) rather then printk.
2. add debug_level module param in order to set debug level during insmod.
3. add debug_level sysfs file in order to allow dynamic control over the
   debug level.

Since patches for pr_debug_hex_dump() implementation haven't been applied yet,
we are still temporarly using print_hex_dump().

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>

diff --git a/drivers/net/wireless/wl12xx/debugfs.c b/drivers/net/wireless/wl12xx/debugfs.c
index 8106a6c..c2cd580 100644 (file)
--- a/drivers/net/wireless/wl12xx/debugfs.c
+++ b/drivers/net/wireless/wl12xx/debugfs.c
@@ -401,6 +401,11 @@ static int wl1271_debugfs_add_files(struct wl1271 *wl)
 
        DEBUGFS_ADD(gpio_power, wl->rootdir);
 
+       entry = debugfs_create_x32("debug_level", 0600, wl->rootdir,
+                                  &wl12xx_debug_level);
+       if (!entry || IS_ERR(entry))
+               goto err;
+
        return 0;
 
 err:

diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c
index 0865585..8c50d3b 100644 (file)
--- a/drivers/net/wireless/wl12xx/main.c
+++ b/drivers/net/wireless/wl12xx/main.c
@@ -2833,6 +2833,11 @@ int wl1271_free_hw(struct wl1271 *wl)
 }
 EXPORT_SYMBOL_GPL(wl1271_free_hw);
 
+u32 wl12xx_debug_level;
+EXPORT_SYMBOL_GPL(wl12xx_debug_level);
+module_param_named(debug_level, wl12xx_debug_level, uint, DEBUG_NONE);
+MODULE_PARM_DESC(debug_level, "wl12xx debugging level");
+
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");

diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index e904c72..07c2297 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -60,31 +60,32 @@ enum {
        DEBUG_ALL       = ~0,
 };
 
-#define DEBUG_LEVEL (DEBUG_NONE)
+extern u32 wl12xx_debug_level;
 
 #define DEBUG_DUMP_LIMIT 1024
 
 #define wl1271_error(fmt, arg...) \
-       printk(KERN_ERR DRIVER_PREFIX "ERROR " fmt "\n", ##arg)
+       pr_err(DRIVER_PREFIX "ERROR " fmt "\n", ##arg)
 
 #define wl1271_warning(fmt, arg...) \
-       printk(KERN_WARNING DRIVER_PREFIX "WARNING " fmt "\n", ##arg)
+       pr_warning(DRIVER_PREFIX "WARNING " fmt "\n", ##arg)
 
 #define wl1271_notice(fmt, arg...) \
-       printk(KERN_INFO DRIVER_PREFIX fmt "\n", ##arg)
+       pr_info(DRIVER_PREFIX fmt "\n", ##arg)
 
 #define wl1271_info(fmt, arg...) \
-       printk(KERN_DEBUG DRIVER_PREFIX fmt "\n", ##arg)
+       pr_info(DRIVER_PREFIX fmt "\n", ##arg)
 
 #define wl1271_debug(level, fmt, arg...) \
        do { \
-               if (level & DEBUG_LEVEL) \
-                       printk(KERN_DEBUG DRIVER_PREFIX fmt "\n", ##arg); \
+               if (level & wl12xx_debug_level) \
+                       pr_debug(DRIVER_PREFIX fmt "\n", ##arg); \
        } while (0)
 
+/* TODO: use pr_debug_hex_dump when it will be available */
 #define wl1271_dump(level, prefix, buf, len)   \
        do { \
-               if (level & DEBUG_LEVEL) \
+               if (level & wl12xx_debug_level) \
                        print_hex_dump(KERN_DEBUG, DRIVER_PREFIX prefix, \
                                       DUMP_PREFIX_OFFSET, 16, 1,       \
                                       buf,                             \
@@ -94,7 +95,7 @@ enum {
 
 #define wl1271_dump_ascii(level, prefix, buf, len)     \
        do { \
-               if (level & DEBUG_LEVEL) \
+               if (level & wl12xx_debug_level) \
                        print_hex_dump(KERN_DEBUG, DRIVER_PREFIX prefix, \
                                       DUMP_PREFIX_OFFSET, 16, 1,       \
                                       buf,                             \