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authorTakashi Iwai <tiwai@suse.de>2015-01-30 12:27:43 +0100
committerTakashi Iwai <tiwai@suse.de>2015-02-06 09:56:33 +0100
commit6bbc7fed849597ec35ffdcaf677910dd11d71d08 (patch)
tree570560b9981f146249c09fbcd8bde9cca8f3fc64 /include/sound
parent4227de2a7e5f0ff6a58e919a9c4f2bb06e882f48 (diff)
downloadop-kernel-dev-6bbc7fed849597ec35ffdcaf677910dd11d71d08.zip
op-kernel-dev-6bbc7fed849597ec35ffdcaf677910dd11d71d08.tar.gz
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>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/core.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/sound/core.h b/include/sound/core.h
index 58882bf..da57482 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -132,6 +132,7 @@ struct snd_card {
struct completion *release_completion;
struct device *dev; /* device assigned to this card */
struct device card_dev; /* cardX object for sysfs */
+ const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */
bool registered; /* card_dev is registered? */
#ifdef CONFIG_PM
@@ -262,6 +263,8 @@ void snd_card_set_id(struct snd_card *card, const char *id);
int snd_card_register(struct snd_card *card);
int snd_card_info_init(void);
int snd_card_info_done(void);
+int snd_card_add_dev_attr(struct snd_card *card,
+ const struct attribute_group *group);
int snd_component_add(struct snd_card *card, const char *component);
int snd_card_file_add(struct snd_card *card, struct file *file);
int snd_card_file_remove(struct snd_card *card, struct file *file);
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