tree 570560b9981f146249c09fbcd8bde9cca8f3fc64
parent 4227de2a7e5f0ff6a58e919a9c4f2bb06e882f48
author Takashi Iwai <tiwai@suse.de> 1422617263 +0100
committer Takashi Iwai <tiwai@suse.de> 1423212993 +0100

ALSA: Add a helper to add a new attribute group to card

For assigning sysfs entries for a card device from the driver,
introduce a new helper function, snd_card_add_dev_attr().  In this
way, we can avoid the possible race between the device registration
and the sysfs addition / removal.

The driver can pass a new attribute group to add freely.  This has to
be called before snd_card_register().

Currently, up to two extra groups can be added.  More than that, it'll
return an error.

Signed-off-by: Takashi Iwai <tiwai@suse.de>