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[ALSA] dynamic minors (4/6): dynamic minor number allocation

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Modules: ALSA Core,ALSA Minor Numbers

Add an option to allocate device file minor numbers dynamically.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch
2005-11-20 14:07:47 +01:00
committed by Jaroslav Kysela
parent f87135f56c
commit 332682b1cd
3 changed files with 86 additions and 27 deletions
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29
include/sound/minors.h
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@@ -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