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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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3
aserver/aserver.c
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@ -647,6 +647,9 @@ static int ctl_shm_cmd(client_t *client)
case SNDRV_CTL_IOCTL_CARD_INFO:
ctrl->result = snd_ctl_card_info(ctl, &ctrl->u.card_info);
break;
case SNDRV_CTL_IOCTL_CARD_COMPONENTS:
ctrl->result = snd_ctl_card_components(ctl, &ctrl->u.card_components);
break;
case SNDRV_CTL_IOCTL_ELEM_LIST:
{
size_t maxsize = CTL_SHM_DATA_MAXLEN;