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ALSA: usb-audio: Add private_data pointer to usb_mixer_elem_info
Add a private_data pointer to usb_mixer_elem_info to allow other mixer implementations to extend the structure as necessary. Signed-off-by: Chris J Arges <chris.j.arges@canonical.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -53,6 +53,7 @@ struct usb_mixer_elem_info {
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int cached;
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int cache_val[MAX_CHANNELS];
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u8 initialized;
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void *private_data;
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};
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int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
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