alsa-mixer: autodetect the HDMI jack PCM device

This removes the need to hardcode the PCM device index in the HDMI jack
names. The hardcoded values don't work with the Intel HDMI LPE driver.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=100488

1 files changed, 48 insertions, 5 deletions

diff --git a/src/modules/alsa/alsa-mixer.c b/src/modules/alsa/alsa-mixer.c
index 02ab4a611..eaee7ea0a 100644
--- a/src/modules/alsa/alsa-mixer.c
+++ b/src/modules/alsa/alsa-mixer.c
@@ -1812,12 +1812,31 @@ static int element_probe(pa_alsa_element *e, snd_mixer_t *m) {
     return 0;
 }
 
-static int jack_probe(pa_alsa_jack *j, snd_mixer_t *m) {
+static int jack_probe(pa_alsa_jack *j, pa_alsa_mapping *mapping, snd_mixer_t *m) {
     bool has_control;
 
     pa_assert(j);
     pa_assert(j->path);
 
+    if (j->append_pcm_to_name) {
+        char *new_name;
+
+        if (!mapping) {
+            /* This could also be an assertion, because this should never
+             * happen. At the time of writing, mapping can only be NULL when
+             * module-alsa-sink/source synthesizes a path, and those
+             * synthesized paths never have any jacks, so jack_probe() should
+             * never be called with a NULL mapping. */
+            pa_log("Jack %s: append_pcm_to_name is set, but mapping is NULL. Can't use this jack.", j->name);
+            return -1;
+        }
+
+        new_name = pa_sprintf_malloc("%s,pcm=%i Jack", j->name, mapping->hw_device_index);
+        pa_xfree(j->alsa_name);
+        j->alsa_name = new_name;
+        j->append_pcm_to_name = false;
+    }
+
     has_control = pa_alsa_mixer_find(m, j->alsa_name, 0) != NULL;
     pa_alsa_jack_set_has_control(j, has_control);
 
@@ -2326,6 +2345,30 @@ static int jack_parse_state(pa_config_parser_state *state) {
     return 0;
 }
 
+static int jack_parse_append_pcm_to_name(pa_config_parser_state *state) {
+    pa_alsa_path *path;
+    pa_alsa_jack *jack;
+    int b;
+
+    pa_assert(state);
+
+    path = state->userdata;
+    if (!(jack = jack_get(path, state->section))) {
+        pa_log("[%s:%u] Option 'append_pcm_to_name' not expected in section '%s'",
+               state->filename, state->lineno, state->section);
+        return -1;
+    }
+
+    b = pa_parse_boolean(state->rvalue);
+    if (b < 0) {
+        pa_log("[%s:%u] Invalid value for 'append_pcm_to_name': %s", state->filename, state->lineno, state->rvalue);
+        return -1;
+    }
+
+    jack->append_pcm_to_name = b;
+    return 0;
+}
+
 static int element_set_option(pa_alsa_element *e, snd_mixer_t *m, int alsa_idx) {
     snd_mixer_selem_id_t *sid;
     snd_mixer_elem_t *me;
@@ -2534,6 +2577,7 @@ pa_alsa_path* pa_alsa_path_new(const char *paths_dir, const char *fname, pa_alsa
         /* [Jack ...] */
         { "state.plugged",       jack_parse_state,                  NULL, NULL },
         { "state.unplugged",     jack_parse_state,                  NULL, NULL },
+        { "append-pcm-to-name",  jack_parse_append_pcm_to_name,     NULL, NULL },
 
         /* [Element ...] */
         { "switch",              element_parse_switch,              NULL, NULL },
@@ -2746,7 +2790,7 @@ static void path_create_settings(pa_alsa_path *p) {
     element_create_settings(p->elements, NULL);
 }
 
-int pa_alsa_path_probe(pa_alsa_path *p, snd_mixer_t *m, bool ignore_dB) {
+int pa_alsa_path_probe(pa_alsa_path *p, pa_alsa_mapping *mapping, snd_mixer_t *m, bool ignore_dB) {
     pa_alsa_element *e;
     pa_alsa_jack *j;
     double min_dB[PA_CHANNEL_POSITION_MAX], max_dB[PA_CHANNEL_POSITION_MAX];
@@ -2766,7 +2810,7 @@ int pa_alsa_path_probe(pa_alsa_path *p, snd_mixer_t *m, bool ignore_dB) {
     pa_log_debug("Probing path '%s'", p->name);
 
     PA_LLIST_FOREACH(j, p->jacks) {
-        if (jack_probe(j, m) < 0) {
+        if (jack_probe(j, mapping, m) < 0) {
             p->supported = false;
             pa_log_debug("Probe of jack '%s' failed.", j->alsa_name);
             return -1;
@@ -3968,9 +4012,8 @@ static void mapping_paths_probe(pa_alsa_mapping *m, pa_alsa_profile *profile,
     }
 
     PA_HASHMAP_FOREACH(p, ps->paths, state) {
-        if (pa_alsa_path_probe(p, mixer_handle, m->profile_set->ignore_dB) < 0) {
+        if (pa_alsa_path_probe(p, m, mixer_handle, m->profile_set->ignore_dB) < 0)
             pa_hashmap_remove(ps->paths, p);
-        }
     }
 
     path_set_condense(ps, mixer_handle);