From 18ea4809517a0d8f5758198d3b1de19260ea86de Mon Sep 17 00:00:00 2001
From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Wed, 1 Apr 2020 18:13:28 +0900
Subject: [PATCH] seq: add global method to get information of port in client

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 src/seq/alsaseq.map |  1 +
 src/seq/port-info.c | 10 +++++++++-
 src/seq/privates.h  |  4 ++++
 src/seq/query.c     | 46 +++++++++++++++++++++++++++++++++++++++++++++
 src/seq/query.h     |  4 ++++
 5 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/src/seq/alsaseq.map b/src/seq/alsaseq.map
index 96d1858..afef3a6 100644
--- a/src/seq/alsaseq.map
+++ b/src/seq/alsaseq.map
@@ -22,6 +22,7 @@ ALSA_GOBJECT_0_0_0 {
     "alsaseq_get_client_id_list";
     "alsaseq_get_client_info";
     "alsaseq_get_port_id_list";
+    "alsaseq_get_port_info";
 
     "alsaseq_system_info_get_type";
 
diff --git a/src/seq/port-info.c b/src/seq/port-info.c
index 75464ea..35dd698 100644
--- a/src/seq/port-info.c
+++ b/src/seq/port-info.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
-#include "port-info.h"
+#include "privates.h"
 
 struct _ALSASeqPortInfoPrivate {
     struct snd_seq_port_info info;
@@ -249,3 +249,11 @@ ALSASeqPortInfo *alsaseq_port_info_new()
 {
     return g_object_new(ALSASEQ_TYPE_PORT_INFO, NULL);
 }
+
+void seq_port_info_refer_private(ALSASeqPortInfo *self,
+                                 struct snd_seq_port_info **info)
+{
+    ALSASeqPortInfoPrivate *priv = alsaseq_port_info_get_instance_private(self);
+
+    *info = &priv->info;
+}
diff --git a/src/seq/privates.h b/src/seq/privates.h
index fe693b9..0db1e9f 100644
--- a/src/seq/privates.h
+++ b/src/seq/privates.h
@@ -9,6 +9,7 @@
 
 #include "system-info.h"
 #include "client-info.h"
+#include "port-info.h"
 
 #include <sound/asequencer.h>
 
@@ -26,6 +27,9 @@ void seq_system_info_refer_private(ALSASeqSystemInfo *self,
 void seq_client_info_refer_private(ALSASeqClientInfo *self,
                                    struct snd_seq_client_info **info);
 
+void seq_port_info_refer_private(ALSASeqPortInfo *self,
+                                 struct snd_seq_port_info **info);
+
 G_END_DECLS
 
 #endif
diff --git a/src/seq/query.c b/src/seq/query.c
index 93a5e29..402e032 100644
--- a/src/seq/query.c
+++ b/src/seq/query.c
@@ -341,3 +341,49 @@ void alsaseq_get_port_id_list(guint client_id, guint **entries,
     *entries = list;
     *entry_count = count;
 }
+
+/**
+ * alsaseq_get_port_info:
+ * @client_id: The numerical ID of client to query. One of
+ *             ALSASeqSpecificClientId is available as well as any numerica
+ *             value.
+ * @port_id: The numerical ID of port in the client. One of
+ *           ALSASeqSpecificPortId is available as well as any numerical value.
+ * @port_info: (out): A #ALSASeqPortInfo for the port.
+ * @error: A #GError.
+ *
+ * Get the information of port in client.
+ */
+void alsaseq_get_port_info(guint client_id, guint port_id,
+                           ALSASeqPortInfo **port_info, GError **error)
+{
+    char *devnode;
+    struct snd_seq_port_info *info;
+    int fd;
+
+    alsaseq_get_seq_devnode(&devnode, error);
+    if (*error != NULL)
+        return;
+
+    *port_info = g_object_new(ALSASEQ_TYPE_PORT_INFO, NULL);
+    seq_port_info_refer_private(*port_info, &info);
+
+    fd = open(devnode, O_RDONLY);
+    g_free(devnode);
+    if (fd < 0) {
+        generate_error(error, errno);
+        g_object_unref(*port_info);
+        *port_info = NULL;
+        return;
+    }
+
+    info->addr.client = client_id;
+    info->addr.port = port_id;
+    if (ioctl(fd, SNDRV_SEQ_IOCTL_GET_PORT_INFO, info) < 0)
+        generate_error(error, errno);
+    close(fd);
+    if (*error != NULL) {
+        g_object_unref(*port_info);
+        *port_info = NULL;
+    }
+}
diff --git a/src/seq/query.h b/src/seq/query.h
index b063142..1713306 100644
--- a/src/seq/query.h
+++ b/src/seq/query.h
@@ -7,6 +7,7 @@
 
 #include <seq/system-info.h>
 #include <seq/client-info.h>
+#include <seq/port-info.h>
 
 G_BEGIN_DECLS
 
@@ -25,6 +26,9 @@ void alsaseq_get_client_info(guint client_id, ALSASeqClientInfo **client_info,
 void alsaseq_get_port_id_list(guint client_id, guint **entries,
                               gsize *entry_count, GError **error);
 
+void alsaseq_get_port_info(guint client_id, guint port_id,
+                           ALSASeqPortInfo **port_info, GError **error);
+
 G_END_DECLS
 
 #endif
-- 
2.47.3