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control: ucm: add ioctl to retrieve full card components

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The fixed-size components field in SNDRV_CTL_IOCTL_CARD_INFO can be too
small on systems with many audio devices. The kernel [1] will provide a
new ioctl to read the full string while truncating the original in
card_info if it grows too big. Make sure the code falls back to original
if the new ioctl is not supported.

[1]: https://lore.kernel.org/all/20260122111249.67319-1-mstrozek@opensource.cirrus.com/
Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
This commit is contained in:
Maciej Strozek 2026-01-22 09:14:17 +00:00
parent 75ed5f05ba
commit d4cf5da490
17 changed files with 180 additions and 5 deletions
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1
include/mixer_abst.h
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@ -75,6 +75,7 @@ typedef struct _sm_class_basic {
snd_ctl_t *ctl;
snd_hctl_t *hctl;
snd_ctl_card_info_t *info;
snd_ctl_card_components_t *card_components;
} sm_class_basic_t;
struct sm_elem_ops {