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

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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>

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Takashi Iwai 2015-01-30 12:27:43 +01:00

parent 4227de2a7e

commit 6bbc7fed84

2 changed files with 28 additions and 6 deletions

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include/sound/core.h

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