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authorKay Sievers <kay.sievers@vrfy.org>2010-11-23 17:43:19 +0100
committerTakashi Iwai <tiwai@suse.de>2010-11-24 05:53:25 +0100
commit03cfe6f57dc5c13ccdd235c23c80e3fa170f03d1 (patch)
treebabee2b37a52ec6b0c5f62f8e4783c937fd265d3 /sound/core/seq
parent109fef9edcc100952eec980acbc2e1295627fbab (diff)
downloadop-kernel-dev-03cfe6f57dc5c13ccdd235c23c80e3fa170f03d1.zip
op-kernel-dev-03cfe6f57dc5c13ccdd235c23c80e3fa170f03d1.tar.gz
ALSA: support module on-demand loading for seq and timer
If CONFIG_SND_DYNAMIC_MINORS is used, assign /dev/snd/seq and /dev/snd/timer the usual static minors, and export specific module aliases to generate udev module on-demand loading instructions: $ cat /lib/modules/2.6.33.4-smp/modules.devname # Device nodes to trigger on-demand module loading. microcode cpu/microcode c10:184 fuse fuse c10:229 ppp_generic ppp c108:0 tun net/tun c10:200 uinput uinput c10:223 dm_mod mapper/control c10:236 snd_timer snd/timer c116:33 snd_seq snd/seq c116:1 The last two lines instruct udev to create device nodes, even when the modules are not loaded at that time. As soon as userspace accesses any of these nodes, the in-kernel module-loader will load the module, and the device can be used. The header file minor calculation needed to be simplified to make __stringify() (supports only two indirections) in the MODULE_ALIAS macro work. This is part of systemd's effort to get rid of unconditional module load instructions and needless init scripts. Cc: Lennart Poettering <lennart@poettering.net> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/seq')
-rw-r--r--sound/core/seq/seq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/core/seq/seq.c b/sound/core/seq/seq.c
index bf09a5a..119fddb6 100644
--- a/sound/core/seq/seq.c
+++ b/sound/core/seq/seq.c
@@ -32,6 +32,7 @@
#include "seq_timer.h"
#include "seq_system.h"
#include "seq_info.h"
+#include <sound/minors.h>
#include <sound/seq_device.h>
#if defined(CONFIG_SND_SEQ_DUMMY_MODULE)
@@ -73,6 +74,9 @@ MODULE_PARM_DESC(seq_default_timer_subdevice, "The default timer subdevice numbe
module_param(seq_default_timer_resolution, int, 0644);
MODULE_PARM_DESC(seq_default_timer_resolution, "The default timer resolution in Hz.");
+MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_SEQUENCER);
+MODULE_ALIAS("devname:snd/seq");
+
/*
* INIT PART
*/
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