[pulseaudio-discuss] [PATCHv2 6/7] alsa: add hook calls for jack insertion and removal

[Margarita Olaya]

This patch adds hook for jack insertion and removal in order for
the UCM device to be changed upon a jack event. Headset.0 device
is used as default device in case of jack insertion.

Signed-off-by: Margarita Olaya Cabrera <magi at slimlogic.co.uk>
---
 src/modules/alsa/alsa-ucm.h         |    2 +
 src/modules/alsa/module-alsa-card.c |   87 +++++++++++++++++++++++++++++++++-
 2 files changed, 86 insertions(+), 3 deletions(-)

diff --git a/src/modules/alsa/alsa-ucm.h b/src/modules/alsa/alsa-ucm.h
index 97fcfca..a923d9a 100644
--- a/src/modules/alsa/alsa-ucm.h
+++ b/src/modules/alsa/alsa-ucm.h
@@ -73,6 +73,8 @@ struct pa_alsa_ucm_config {
     snd_use_case_mgr_t *ucm_mgr;
     const char *verb_ini;
     const char *verb_new;
+    const char *dev_ini;
+    const char *dev_new;
     pa_alsa_ucm_status_t status;

     PA_LLIST_HEAD(pa_alsa_ucm_verb, verbs);
diff --git a/src/modules/alsa/module-alsa-card.c
b/src/modules/alsa/module-alsa-card.c
index dd80927..e4d4e9b 100644
--- a/src/modules/alsa/module-alsa-card.c
+++ b/src/modules/alsa/module-alsa-card.c
@@ -111,6 +111,10 @@ struct userdata {
     pa_alsa_profile_set *profile_set;

     pa_alsa_ucm_config ucm;
+
+    pa_hook_slot
+        *jack_insert_new_hook_slot,
+        *jack_remove_new_hook_slot;
 };

 static void add_profiles(struct userdata *u, pa_hashmap *h) {
@@ -371,6 +375,73 @@ static int card_query_ucm_profiles(struct
userdata *u, int card_index)
     return 1;
 }

+static pa_hook_result_t jack_insert_new_hook_callback(pa_core *c,
void *new_data, struct userdata *u) {
+    struct pa_alsa_ucm_config *ucm = &u->ucm;
+    struct profile_data *d;
+    const char **enadev_list;
+    int num_dev, i;
+
+    pa_assert(u);
+
+    d = PA_CARD_PROFILE_DATA(u->card->active_profile);
+
+    pa_log_debug("Jack insert new hook callback");
+
+    num_dev = snd_use_case_get_list(ucm->ucm_mgr, "_enadevs", &enadev_list);
+    if (num_dev < 0) {
+        pa_log_info("no device found for %s", d->profile->name);
+        return PA_HOOK_CANCEL;
+    }
+
+    for (i = 0; i < num_dev; i += 2) {
+        if (strcmp(enadev_list[i], "Headset") == 0) {
+            pa_log_info("Headset device already set");
+            return PA_HOOK_OK;
+        }
+    }
+
+    /* Store current device */
+    ucm->dev_ini = enadev_list[0];
+
+    /* Set headset.0 device per default */
+    if (snd_use_case_set(ucm->ucm_mgr, "_enadev", "Headset.0") < 0) {
+        pa_log("failed to set device Headset.0");
+        return PA_HOOK_CANCEL;
+    }
+
+    ucm->dev_new = "Headset.0";
+    pa_log_info("set device Headset.0");
+    return PA_HOOK_OK;
+}
+
+static pa_hook_result_t jack_remove_new_hook_callback(pa_core *c,
void *new_data, struct userdata *u) {
+    struct profile_data *d;
+    struct pa_alsa_ucm_config *ucm = &u->ucm;
+    char *tmp;
+
+    pa_assert(u);
+
+    d = PA_CARD_PROFILE_DATA(u->card->active_profile);
+
+    pa_log_debug("Jack removed new hook callback");
+
+    if (strcmp(ucm->dev_ini, ucm->dev_new) == 0) {
+        pa_log_debug("Device already set");
+        return PA_HOOK_OK;
+    }
+
+    /* Set previous device */
+    tmp = pa_sprintf_malloc("_swdev/%s", ucm->dev_new);
+    if ((snd_use_case_set(ucm->ucm_mgr, tmp, ucm->dev_ini)) < 0) {
+        pa_log("failed to switch device %s %s", tmp, ucm->dev_ini);
+        if (snd_use_case_set(ucm->ucm_mgr, "_disdev", ucm->dev_new) < 0)
+            pa_log("failed to disabled device %s", ucm->dev_new);
+    }
+
+    pa_xfree(tmp);
+    return PA_HOOK_OK;
+}
+
 int pa__init(pa_module *m) {
     pa_card_new_data data;
     pa_modargs *ma;
@@ -413,9 +484,12 @@ int pa__init(pa_module *m) {
         }
     }

-    if (card_query_ucm_profiles(u, alsa_card_index))
+    if (card_query_ucm_profiles(u, alsa_card_index)) {
+        /* Initialize hooks for jack detection */
+        u->jack_insert_new_hook_slot =
pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_JACK_INSERT],
PA_HOOK_NORMAL, (pa_hook_cb_t) jack_insert_new_hook_callback, u);
+        u->jack_remove_new_hook_slot =
pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_JACK_REMOVE],
PA_HOOK_NORMAL, (pa_hook_cb_t) jack_remove_new_hook_callback, u);
         pa_log_info("Found UCM profiles");
-    else {
+    } else {
 #ifdef HAVE_UDEV
         fn = pa_udev_get_property(alsa_card_index, "PULSE_PROFILE_SET");
 #endif
@@ -553,8 +627,15 @@ void pa__done(pa_module*m) {
             pa_alsa_source_free(s);
     }

-    if (u->ucm.status == PA_ALSA_UCM_ENABLED)
+    if (u->ucm.status == PA_ALSA_UCM_ENABLED) {
+        if (u->jack_insert_new_hook_slot)
+            pa_hook_slot_free(u->jack_insert_new_hook_slot);
+
+        if (u->jack_remove_new_hook_slot)
+            pa_hook_slot_free(u->jack_remove_new_hook_slot);
+
         free_ucm(&u->ucm);
+    }

     if (u->card)
         pa_card_free(u->card);
-- 
1.7.0.4