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| author | Takashi Iwai <tiwai@suse.de> | 2020-03-23 18:06:42 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-03-23 18:09:19 +0100 |
| commit | c208a5335036a332c0248b0e16fca57332b3f1d1 (patch) | |
| tree | 70ac581c06c71927be783ffbd3d465c1496c6b99 /sound/core | |
| parent | 55f7326170d9e83e2d828591938e1101982a679c (diff) | |
| download | linux-c208a5335036a332c0248b0e16fca57332b3f1d1.tar.bz2 | |
ALSA: core: Add snd_device_get_state() helper
A new small helper to get the current state of the device registration
for the given object. It'll be used for USB-audio driver to check the
delayed device registrations.
Link: https://lore.kernel.org/r/20200323170643.19181-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/device.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/sound/core/device.c b/sound/core/device.c index cdc5af526739..bf0b04a7ee79 100644 --- a/sound/core/device.c +++ b/sound/core/device.c @@ -237,3 +237,24 @@ void snd_device_free_all(struct snd_card *card) list_for_each_entry_safe_reverse(dev, next, &card->devices, list) __snd_device_free(dev); } + +/** + * snd_device_get_state - Get the current state of the given device + * @card: the card instance + * @device_data: the data pointer to release + * + * Returns the current state of the given device object. For the valid + * device, either @SNDRV_DEV_BUILD, @SNDRV_DEV_REGISTERED or + * @SNDRV_DEV_DISCONNECTED is returned. + * Or for a non-existing device, -1 is returned as an error. + */ +int snd_device_get_state(struct snd_card *card, void *device_data) +{ + struct snd_device *dev; + + dev = look_for_dev(card, device_data); + if (dev) + return dev->state; + return -1; +} +EXPORT_SYMBOL_GPL(snd_device_get_state); |