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-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt6
-rw-r--r--include/sound/core.h38
-rw-r--r--sound/core/misc.c67
3 files changed, 59 insertions, 52 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 4252697a95d6..8e5b3488b370 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -60,6 +60,12 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
slots - Reserve the slot index for the given driver.
This option takes multiple strings.
See "Module Autoloading Support" section for details.
+ debug - Specifies the debug message level
+ (0 = disable debug prints, 1 = normal debug messages,
+ 2 = verbose debug messages)
+ This option appears only when CONFIG_SND_DEBUG=y.
+ This option can be dynamically changed via sysfs
+ /sys/modules/snd/parameters/debug file.
Module snd-pcm-oss
------------------
diff --git a/include/sound/core.h b/include/sound/core.h
index 309cb9659a05..a89728db5584 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -340,18 +340,17 @@ unsigned int snd_dma_pointer(unsigned long dma, unsigned int size);
struct resource;
void release_and_free_resource(struct resource *res);
-#ifdef CONFIG_SND_VERBOSE_PRINTK
-void snd_verbose_printk(const char *file, int line, const char *format, ...)
- __attribute__ ((format (printf, 3, 4)));
-#endif
-#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
-void snd_verbose_printd(const char *file, int line, const char *format, ...)
- __attribute__ ((format (printf, 3, 4)));
-#endif
-
/* --- */
-#ifdef CONFIG_SND_VERBOSE_PRINTK
+#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
+void __snd_printk(unsigned int level, const char *file, int line,
+ const char *format, ...)
+ __attribute__ ((format (printf, 4, 5)));
+#else
+#define __snd_printk(level, file, line, format, args...) \
+ prinkt(format, ##args)
+#endif
+
/**
* snd_printk - printk wrapper
* @fmt: format string
@@ -360,15 +359,9 @@ void snd_verbose_printd(const char *file, int line, const char *format, ...)
* when configured with CONFIG_SND_VERBOSE_PRINTK.
*/
#define snd_printk(fmt, args...) \
- snd_verbose_printk(__FILE__, __LINE__, fmt ,##args)
-#else
-#define snd_printk(fmt, args...) \
- printk(fmt ,##args)
-#endif
+ __snd_printk(0, __FILE__, __LINE__, fmt, ##args)
#ifdef CONFIG_SND_DEBUG
-
-#ifdef CONFIG_SND_VERBOSE_PRINTK
/**
* snd_printd - debug printk
* @fmt: format string
@@ -377,11 +370,7 @@ void snd_verbose_printd(const char *file, int line, const char *format, ...)
* Ignored when CONFIG_SND_DEBUG is not set.
*/
#define snd_printd(fmt, args...) \
- snd_verbose_printd(__FILE__, __LINE__, fmt ,##args)
-#else
-#define snd_printd(fmt, args...) \
- printk(fmt ,##args)
-#endif
+ __snd_printk(1, __FILE__, __LINE__, fmt, ##args)
/**
* snd_BUG - give a BUG warning message and stack trace
@@ -428,9 +417,10 @@ static inline int __snd_bug_on(int cond)
* Works like snd_printk() for debugging purposes.
* Ignored when CONFIG_SND_DEBUG_VERBOSE is not set.
*/
-#define snd_printdd(format, args...) snd_printk(format, ##args)
+#define snd_printdd(format, args...) \
+ __snd_printk(2, __FILE__, __LINE__, format, ##args)
#else
-#define snd_printdd(format, args...) /* nothing */
+#define snd_printdd(format, args...) do { } while (0)
#endif
diff --git a/sound/core/misc.c b/sound/core/misc.c
index 1d29e678369e..23a032c6d487 100644
--- a/sound/core/misc.c
+++ b/sound/core/misc.c
@@ -24,6 +24,20 @@
#include <linux/ioport.h>
#include <sound/core.h>
+#ifdef CONFIG_SND_DEBUG
+
+#ifdef CONFIG_SND_DEBUG_VERBOSE
+#define DEFAULT_DEBUG_LEVEL 2
+#else
+#define DEFAULT_DEBUG_LEVEL 1
+#endif
+
+static int debug = DEFAULT_DEBUG_LEVEL;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
+
+#endif /* CONFIG_SND_DEBUG */
+
void release_and_free_resource(struct resource *res)
{
if (res) {
@@ -35,6 +49,7 @@ void release_and_free_resource(struct resource *res)
EXPORT_SYMBOL(release_and_free_resource);
#ifdef CONFIG_SND_VERBOSE_PRINTK
+/* strip the leading path if the given path is absolute */
static const char *sanity_file_name(const char *path)
{
if (*path == '/')
@@ -43,48 +58,44 @@ static const char *sanity_file_name(const char *path)
return path;
}
-void snd_verbose_printk(const char *path, int line, const char *format, ...)
+/* print file and line with a certain printk prefix */
+static int print_snd_pfx(unsigned int level, const char *path, int line,
+ const char *format)
{
const char *file = sanity_file_name(path);
- va_list args;
-
- if (format[0] == '<' && format[1] >= '0' && format[1] <= '7' && format[2] == '>') {
- char tmp[] = "<0>";
+ char tmp[] = "<0>";
+ const char *pfx = level ? KERN_DEBUG : KERN_DEFAULT;
+ int ret = 0;
+
+ if (format[0] == '<' && format[2] == '>') {
tmp[1] = format[1];
- printk("%sALSA %s:%d: ", tmp, file, line);
- format += 3;
- } else {
- printk("ALSA %s:%d: ", file, line);
+ pfx = tmp;
+ ret = 1;
}
- va_start(args, format);
- vprintk(format, args);
- va_end(args);
+ printk("%sALSA %s:%d: ", pfx, file, line);
+ return ret;
}
-
-EXPORT_SYMBOL(snd_verbose_printk);
+#else
+#define print_snd_pfx(level, path, line, format) 0
#endif
-#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
-void snd_verbose_printd(const char *path, int line, const char *format, ...)
+#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
+void __snd_printk(unsigned int level, const char *path, int line,
+ const char *format, ...)
{
- const char *file = sanity_file_name(path);
va_list args;
- if (format[0] == '<' && format[1] >= '0' && format[1] <= '7' && format[2] == '>') {
- char tmp[] = "<0>";
- tmp[1] = format[1];
- printk("%sALSA %s:%d: ", tmp, file, line);
- format += 3;
- } else {
- printk(KERN_DEBUG "ALSA %s:%d: ", file, line);
- }
+#ifdef CONFIG_SND_DEBUG
+ if (debug < level)
+ return;
+#endif
va_start(args, format);
+ if (print_snd_pfx(level, path, line, format))
+ format += 3; /* skip the printk level-prefix */
vprintk(format, args);
va_end(args);
-
}
-
-EXPORT_SYMBOL(snd_verbose_printd);
+EXPORT_SYMBOL_GPL(__snd_printk);
#endif
#ifdef CONFIG_PCI
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