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ucm: implement ValueDefaults.BootCardGroup and define use

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We need a boot synchronization for multiple UCM cards where linking
is expected like AMD ACP or Intel AVS drivers. This method is
using a timestamp file which can be created and modified during
the boot process (e.g. from the alsactl tool).

The goal is to return a valid UCM configuration for standard
applications combining multiple ALSA cards into one UCM configuration
and cover the time window when all cards have not been probed yet.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2025-12-01 13:32:10 +01:00
parent 5c4a683bd0
commit 554efca497
5 changed files with 356 additions and 12 deletions
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8
src/ucm/ucm_local.h
View file

@ -234,6 +234,8 @@ struct snd_use_case_mgr {
const char *parse_variant;
int parse_master_section;
int sequence_hops;
bool in_boot;
bool card_group;
/* UCM cards list */
struct list_head cards_list;
@ -308,7 +310,8 @@ void uc_mgr_free(snd_use_case_mgr_t *uc_mgr);
static inline int uc_mgr_has_local_config(snd_use_case_mgr_t *uc_mgr)
{
return uc_mgr && snd_config_iterator_first(uc_mgr->local_config) !=
return uc_mgr && uc_mgr->local_config &&
snd_config_iterator_first(uc_mgr->local_config) !=
snd_config_iterator_end(uc_mgr->local_config);
}
@ -331,11 +334,14 @@ struct ctl_list *uc_mgr_get_ctl_by_name(snd_use_case_mgr_t *uc_mgr,
const char *name, int idx);
snd_ctl_t *uc_mgr_get_ctl(snd_use_case_mgr_t *uc_mgr);
void uc_mgr_free_ctl_list(snd_use_case_mgr_t *uc_mgr);
int uc_mgr_card_number(struct ctl_list *list);
void uc_mgr_free_value(struct list_head *base);
int uc_mgr_add_value(struct list_head *base, const char *key, char *val);
int uc_mgr_check_value(struct list_head *value_list, const char *identifier);
const char *uc_mgr_get_variable(snd_use_case_mgr_t *uc_mgr,
const char *name);