Add initial working implementation

Signed-off-by: Mark Farrugia <mark.farrugia@fiberdyne.com.au>

3 files changed, 181 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..9af162f
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,32 @@
+#*************************************************************************
+#
+#  FIBERDYNE CONFIDENTIAL
+#  __________________
+#
+#   [2010] - [2017] Fiberdyne Systems Pty Ltd
+#   All Rights Reserved.
+#
+#  NOTICE:  All information contained herein is, and remains
+#  the property of Fiberdyne Systems Pty Ltd and its suppliers,
+#  if any.  The intellectual and technical concepts contained
+#  herein are proprietary to Fiberdyne Systems Pty Ltd
+#  and its suppliers and may be covered by U.S. and Foreign Patents,
+#  patents in process, and are protected by trade secret or copyright law.
+#  Dissemination of this information or reproduction of this material
+#  is strictly forbidden unless prior written permission is obtained
+#  from Fiberdyne Systems Pty Ltd.
+#
+#*************************************************************************
+
+#-------------------------------------------------------------------------------
+#  LIBAVIRT CONFIGURATION LIBRARY
+#-------------------------------------------------------------------------------
+
+# Defines
+add_definitions(-D_GNU_SOURCE)
+
+# Target
+add_library(avirt STATIC src/avirt_*.c)
+
+# Target includes
+target_include_directories(avirt PUBLIC include)
diff --git a/include/avirt.h b/include/avirt.h
new file mode 100644
index 0000000..5bb8731
--- /dev/null
+++ b/include/avirt.h
@@ -0,0 +1,29 @@
+/*
+ * AVIRT User-space library
+ * 
+ * avirt.h - AVIRT User-space library header
+ *
+ * Copyright (C) 2018 Fiberdyne Systems Pty Ltd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _AVIRT_H_
+#define _AVIRT_H_
+
+int AVIRT_CreateStream(const char *name, unsigned int channels, int direction);
+
+int AVIRT_SealCard();
+
+#endif // _AVIRT_H_
diff --git a/src/avirt-config.c b/src/avirt-config.c
new file mode 100644
index 0000000..f819c65
--- /dev/null
+++ b/src/avirt-config.c
@@ -0,0 +1,120 @@
+/*
+ * AVIRT User-space library
+ * 
+ * avirt-config.c - Main AVIRT configuration via configfs
+ *
+ * Copyright (C) 2018 Fiberdyne Systems Pty Ltd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "avirt-config.h"
+
+#include <stdbool.h>
+#include <alsa/asoundlib.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+
+#define AVIRT_CONFIGFS_PATH_STREAMS "/config/avirt/streams/"
+#define AVIRT_CONFIGFS_PATH_MAXLEN 64
+
+static bool configfs_mounted = false;
+
+static int mount_configfs()
+{
+  int err;
+
+  err = mount("none", "/config", "configfs", 0, NULL);
+  if (!err)
+    configfs_mounted = true;
+  else
+    printf("AVIRT ERROR: Failed to mount configfs filesystem!");
+
+  return err;
+}
+
+int AVIRT_CreateStream(const char *name, unsigned int channels, int direction)
+{
+  int err;
+  char path[AVIRT_CONFIGFS_PATH_MAXLEN];
+  char path_chans[AVIRT_CONFIGFS_PATH_MAXLEN];
+  FILE *fd;
+
+  if (!configfs_mounted) {
+    err = mount_configfs();
+    if (err < 0)
+      return err;
+  }
+
+  strcpy(path, AVIRT_CONFIGFS_PATH_STREAMS);
+  switch (direction) {
+    case SND_PCM_STREAM_PLAYBACK:
+      strcat(path, "playback_");
+      break;
+    case SND_PCM_STREAM_CAPTURE:
+      strcat(path, "capture_");
+      break;
+    default:
+      return -EINVAL;
+  }
+
+  if ((AVIRT_CONFIGFS_PATH_MAXLEN - strlen(path)) < strlen(name))
+  {
+    printf("AVIRT ERROR: Cannot create stream '%s' since name is too long!", name);
+    return -ENOMEM;
+  }
+
+  strcat(path, name);
+  err = mkdir(path, S_IRWXU | S_IRWXG | S_IRWXO);
+  if (err < 0)
+  {
+    printf("AVIRT ERROR: Cannot create stream '%s' at directory '%s'\n", name, path);
+    return err;
+  }
+
+  strcpy(path_chans, path);
+  strcat(path_chans, "/channels");
+  fd = fopen(path_chans, "w");
+  if (!fd)
+  {
+    printf("AVIRT ERROR: Failed to open file at '%s'", path_chans);
+    return -1;
+  }
+
+  fprintf(fd, "%d", channels);
+
+  return 0;
+}
+
+int AVIRT_SealCard()
+{
+  int err;
+
+  if (!configfs_mounted) {
+    err = mount_configfs();
+    if (err < 0)
+      return err;
+  }
+
+  strcpy(path_sealed, AVIRT_);
+  strcat(path_chans, "/sealed");
+  fd = fopen(path_chans, "w");
+  if (!fd)
+  {
+    printf("AVIRT ERROR: Failed to open file at '%s'", path_chans);
+    return -1;
+  }
+
+  fprintf(fd, "%d", 1);
+}