[ALSA] dynamic minors (4/6): dynamic minor number allocation
Modules: ALSA Core,ALSA Minor Numbers
Add an option to allocate device file minor numbers dynamically.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/include/sound/minors.h b/include/sound/minors.h
index a17b5c9..46bcd20 100644
--- a/include/sound/minors.h
+++ b/include/sound/minors.h
@@ -26,18 +26,20 @@
#define SNDRV_MINOR_DEVICE(minor) ((minor) & 0x001f)
#define SNDRV_MINOR(card, dev) (((card) << 5) | (dev))
-#define SNDRV_MINOR_CONTROL 0 /* 0 - 0 */
+/* these minors can still be used for autoloading devices (/dev/aload*) */
+#define SNDRV_MINOR_CONTROL 0 /* 0 */
#define SNDRV_MINOR_GLOBAL 1 /* 1 */
#define SNDRV_MINOR_SEQUENCER (SNDRV_MINOR_GLOBAL + 0 * 32)
#define SNDRV_MINOR_TIMER (SNDRV_MINOR_GLOBAL + 1 * 32)
+
+#ifndef CONFIG_SND_DYNAMIC_MINORS
+ /* 2 - 3 (reserved) */
#define SNDRV_MINOR_HWDEP 4 /* 4 - 7 */
-#define SNDRV_MINOR_HWDEPS 4
#define SNDRV_MINOR_RAWMIDI 8 /* 8 - 15 */
-#define SNDRV_MINOR_RAWMIDIS 8
#define SNDRV_MINOR_PCM_PLAYBACK 16 /* 16 - 23 */
#define SNDRV_MINOR_PCM_CAPTURE 24 /* 24 - 31 */
-#define SNDRV_MINOR_PCMS 8
+/* same as first respective minor number to make minor allocation easier */
#define SNDRV_DEVICE_TYPE_CONTROL SNDRV_MINOR_CONTROL
#define SNDRV_DEVICE_TYPE_HWDEP SNDRV_MINOR_HWDEP
#define SNDRV_DEVICE_TYPE_RAWMIDI SNDRV_MINOR_RAWMIDI
@@ -46,6 +48,25 @@
#define SNDRV_DEVICE_TYPE_SEQUENCER SNDRV_MINOR_SEQUENCER
#define SNDRV_DEVICE_TYPE_TIMER SNDRV_MINOR_TIMER
+#else /* CONFIG_SND_DYNAMIC_MINORS */
+
+enum {
+ SNDRV_DEVICE_TYPE_CONTROL,
+ SNDRV_DEVICE_TYPE_SEQUENCER,
+ SNDRV_DEVICE_TYPE_TIMER,
+ SNDRV_DEVICE_TYPE_HWDEP,
+ SNDRV_DEVICE_TYPE_RAWMIDI,
+ SNDRV_DEVICE_TYPE_PCM_PLAYBACK,
+ SNDRV_DEVICE_TYPE_PCM_CAPTURE,
+};
+
+#endif /* CONFIG_SND_DYNAMIC_MINORS */
+
+#define SNDRV_MINOR_HWDEPS 4
+#define SNDRV_MINOR_RAWMIDIS 8
+#define SNDRV_MINOR_PCMS 8
+
+
#ifdef CONFIG_SND_OSSEMUL
#define SNDRV_MINOR_OSS_DEVICES 16