alsa: Move UCM port availability updating to the mixer code

Previously module-alsa-card assigned to pa_alsa_jack.plugged_in
directly, and then did the port availability updating manually. The
idea of pa_alsa_jack_set_plugged_in() is to move the availability
updating to the mixer infrastructure, where it really belongs.

Similarly, pa_alsa_jack.has_control was previously modified directly
from several places. The has_control field affects the port
availability, and pa_alsa_jack_set_has_control() takes care of
updating the availability.

For now, pa_alsa_jack_set_plugged_in() and
pa_alsa_jack_set_has_control() only update the port availability
when using UCM. My plan is to adapt the traditional mixer code later.

src/modules/alsa/alsa-mixer.c

@@ -139,6 +139,36 @@ void pa_alsa_jack_free(pa_alsa_jack *jack) {
     pa_xfree(jack);
 }
 
+void pa_alsa_jack_set_has_control(pa_alsa_jack *jack, bool has_control) {
+    pa_alsa_ucm_device *device;
+    unsigned idx;
+
+    pa_assert(jack);
+
+    if (has_control == jack->has_control)
+        return;
+
+    jack->has_control = has_control;
+
+    PA_DYNARRAY_FOREACH(device, jack->ucm_devices, idx)
+        pa_alsa_ucm_device_update_available(device);
+}
+
+void pa_alsa_jack_set_plugged_in(pa_alsa_jack *jack, bool plugged_in) {
+    pa_alsa_ucm_device *device;
+    unsigned idx;
+
+    pa_assert(jack);
+
+    if (plugged_in == jack->plugged_in)
+        return;
+
+    jack->plugged_in = plugged_in;
+
+    PA_DYNARRAY_FOREACH(device, jack->ucm_devices, idx)
+        pa_alsa_ucm_device_update_available(device);
+}
+
 void pa_alsa_jack_add_ucm_device(pa_alsa_jack *jack, pa_alsa_ucm_device *device) {
     pa_assert(jack);
     pa_assert(device);
@@ -1755,10 +1785,13 @@ static int element_probe(pa_alsa_element *e, snd_mixer_t *m) {
 }
 
 static int jack_probe(pa_alsa_jack *j, snd_mixer_t *m) {
+    bool has_control;
+
     pa_assert(j);
     pa_assert(j->path);
 
-    j->has_control = pa_alsa_mixer_find(m, j->alsa_name, 0) != NULL;
+    has_control = pa_alsa_mixer_find(m, j->alsa_name, 0) != NULL;
+    pa_alsa_jack_set_has_control(j, has_control);
 
     if (j->has_control) {
         if (j->required_absent != PA_ALSA_REQUIRED_IGNORE)

src/modules/alsa/alsa-mixer.h

@@ -174,6 +174,8 @@ struct pa_alsa_jack {
 
 pa_alsa_jack *pa_alsa_jack_new(pa_alsa_path *path, const char *name, const char *alsa_name);
 void pa_alsa_jack_free(pa_alsa_jack *jack);
+void pa_alsa_jack_set_has_control(pa_alsa_jack *jack, bool has_control);
+void pa_alsa_jack_set_plugged_in(pa_alsa_jack *jack, bool plugged_in);
 void pa_alsa_jack_add_ucm_device(pa_alsa_jack *jack, pa_alsa_ucm_device *device);
 
 /* A path wraps a series of elements into a single entity which can be

src/modules/alsa/alsa-ucm.c

@@ -90,6 +90,7 @@ struct ucm_port {
 static struct ucm_port *ucm_port_new(pa_alsa_ucm_config *ucm, pa_device_port *core_port, pa_alsa_ucm_device **devices,
                                      unsigned n_devices);
 static void ucm_port_free(struct ucm_port *port);
+static void ucm_port_update_available(struct ucm_port *port);
 
 static struct ucm_items item[] = {
     {"PlaybackPCM", PA_ALSA_PROP_UCM_SINK},
@@ -413,6 +414,7 @@ static int ucm_get_devices(pa_alsa_ucm_verb *verb, snd_use_case_mgr_t *uc_mgr) {
         pa_proplist_sets(d->proplist, PA_ALSA_PROP_UCM_NAME, pa_strnull(dev_list[i]));
         pa_proplist_sets(d->proplist, PA_ALSA_PROP_UCM_DESCRIPTION, pa_strna(dev_list[i + 1]));
         d->ucm_ports = pa_dynarray_new(NULL);
+        d->available = PA_AVAILABLE_UNKNOWN;
 
         PA_LLIST_PREPEND(pa_alsa_ucm_device, verb->devices, d);
     }
@@ -1465,7 +1467,10 @@ static void ucm_mapping_jack_probe(pa_alsa_mapping *m) {
         return;
 
     PA_IDXSET_FOREACH(dev, context->ucm_devices, idx) {
-        dev->jack->has_control = pa_alsa_mixer_find(mixer_handle, dev->jack->alsa_name, 0) != NULL;
+        bool has_control;
+
+        has_control = pa_alsa_mixer_find(mixer_handle, dev->jack->alsa_name, 0) != NULL;
+        pa_alsa_jack_set_has_control(dev->jack, has_control);
         pa_log_info("UCM jack %s has_control=%d", dev->jack->name, dev->jack->has_control);
     }
 
@@ -1716,6 +1721,34 @@ static void device_set_jack(pa_alsa_ucm_device *device, pa_alsa_jack *jack) {
 
     device->jack = jack;
     pa_alsa_jack_add_ucm_device(jack, device);
+
+    pa_alsa_ucm_device_update_available(device);
+}
+
+static void device_set_available(pa_alsa_ucm_device *device, pa_available_t available) {
+    struct ucm_port *port;
+    unsigned idx;
+
+    pa_assert(device);
+
+    if (available == device->available)
+        return;
+
+    device->available = available;
+
+    PA_DYNARRAY_FOREACH(port, device->ucm_ports, idx)
+        ucm_port_update_available(port);
+}
+
+void pa_alsa_ucm_device_update_available(pa_alsa_ucm_device *device) {
+    pa_available_t available = PA_AVAILABLE_UNKNOWN;
+
+    pa_assert(device);
+
+    if (device->jack && device->jack->has_control)
+        available = device->jack->plugged_in ? PA_AVAILABLE_YES : PA_AVAILABLE_NO;
+
+    device_set_available(device, available);
 }
 
 static struct ucm_port *ucm_port_new(pa_alsa_ucm_config *ucm, pa_device_port *core_port, pa_alsa_ucm_device **devices,
@@ -1737,6 +1770,8 @@ static struct ucm_port *ucm_port_new(pa_alsa_ucm_config *ucm, pa_device_port *co
         device_add_ucm_port(devices[i], port);
     }
 
+    ucm_port_update_available(port);
+
     return port;
 }
 
@@ -1749,6 +1784,25 @@ static void ucm_port_free(struct ucm_port *port) {
     pa_xfree(port);
 }
 
+static void ucm_port_update_available(struct ucm_port *port) {
+    pa_alsa_ucm_device *device;
+    unsigned idx;
+    pa_available_t available = PA_AVAILABLE_YES;
+
+    pa_assert(port);
+
+    PA_DYNARRAY_FOREACH(device, port->devices, idx) {
+        if (device->available == PA_AVAILABLE_UNKNOWN)
+            available = PA_AVAILABLE_UNKNOWN;
+        else if (device->available == PA_AVAILABLE_NO) {
+            available = PA_AVAILABLE_NO;
+            break;
+        }
+    }
+
+    pa_device_port_set_available(port->core_port, available);
+}
+
 #else /* HAVE_ALSA_UCM */
 
 /* Dummy functions for systems without UCM support */

src/modules/alsa/alsa-ucm.h

@@ -148,8 +148,11 @@ struct pa_alsa_ucm_device {
     pa_dynarray *ucm_ports; /* struct ucm_port */
 
     pa_alsa_jack *jack;
+    pa_available_t available;
 };
 
+void pa_alsa_ucm_device_update_available(pa_alsa_ucm_device *device);
+
 struct pa_alsa_ucm_modifier {
     PA_LLIST_FIELDS(pa_alsa_ucm_modifier);
 

src/modules/alsa/module-alsa-card.c

@@ -378,16 +378,17 @@ static int report_jack_state(snd_mixer_elem_t *melem, unsigned int mask) {
 
     PA_HASHMAP_FOREACH(jack, u->jacks, state)
         if (jack->melem == melem) {
-            jack->plugged_in = plugged_in;
+            pa_alsa_jack_set_plugged_in(jack, plugged_in);
+
             if (u->use_ucm) {
-                pa_assert(u->card->ports);
-                port = pa_hashmap_get(u->card->ports, jack->name);
-                pa_assert(port);
+                /* When using UCM, pa_alsa_jack_set_plugged_in() maps the jack
+                 * state to port availability. */
+                continue;
             }
-            else {
-                pa_assert(jack->path);
+
+            /* When not using UCM, we have to do the jack state -> port
+             * availability mapping ourselves. */
             pa_assert_se(port = jack->path->port);
-            }
             report_port_state(port, u);
         }
     return 0;
@@ -515,7 +516,7 @@ static void init_jacks(struct userdata *u) {
             jack->melem = pa_alsa_mixer_find(u->mixer_handle, jack->alsa_name, 0);
             if (!jack->melem) {
                 pa_log_warn("Jack '%s' seems to have disappeared.", jack->alsa_name);
-                jack->has_control = false;
+                pa_alsa_jack_set_has_control(jack, false);
                 continue;
             }
             snd_mixer_elem_set_callback(jack->melem, report_jack_state);

src/pulsecore/device-port.c

@@ -66,8 +66,6 @@ void pa_device_port_new_data_done(pa_device_port_new_data *data) {
 }
 
 void pa_device_port_set_available(pa_device_port *p, pa_available_t status) {
-    pa_core *core;
-
     pa_assert(p);
 
     if (p->available == status)
@@ -80,10 +78,14 @@ void pa_device_port_set_available(pa_device_port *p, pa_available_t status) {
        status == PA_AVAILABLE_NO ? "no" : "unknown");
 
     /* Post subscriptions to the card which owns us */
-    pa_assert_se(core = p->core);
-    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_CHANGE, p->card->index);
-
-    pa_hook_fire(&core->hooks[PA_CORE_HOOK_PORT_AVAILABLE_CHANGED], p);
+    /* XXX: We need to check p->card, because this function may be called
+     * before the card object has been created. The card object should probably
+     * be created before port objects, and then p->card could be non-NULL for
+     * the whole lifecycle of pa_device_port. */
+    if (p->card) {
+        pa_subscription_post(p->core, PA_SUBSCRIPTION_EVENT_CARD|PA_SUBSCRIPTION_EVENT_CHANGE, p->card->index);
+        pa_hook_fire(&p->core->hooks[PA_CORE_HOOK_PORT_AVAILABLE_CHANGED], p);
+    }
 }
 
 static void device_port_free(pa_object *o) {