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Subject[PATCH RESEND1 01/12] ALSA: vsnd: Introduce Xen para-virtualized sound frontend driver
Date
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

Introduce skeleton of the para-virtualized Xen sound
frontend driver. This patch only adds required
essential stubs.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
sound/drivers/xen-front.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 78 insertions(+)
create mode 100644 sound/drivers/xen-front.c

diff --git a/sound/drivers/xen-front.c b/sound/drivers/xen-front.c
new file mode 100644
index 000000000000..61779c36cae3
--- /dev/null
+++ b/sound/drivers/xen-front.c
@@ -0,0 +1,78 @@
+/*
+ * Xen para-virtual sound device
+ *
+ * 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.
+ *
+ * Based on: sound/drivers/dummy.c
+ *
+ * Copyright (C) 2016-2017 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
+ */
+
+#include <linux/module.h>
+
+#include <xen/platform_pci.h>
+#include <xen/xen.h>
+#include <xen/xenbus.h>
+
+#include <xen/interface/io/sndif.h>
+
+static void xdrv_be_on_changed(struct xenbus_device *xb_dev,
+ enum xenbus_state backend_state)
+{
+}
+
+static int xdrv_probe(struct xenbus_device *xb_dev,
+ const struct xenbus_device_id *id)
+{
+ return 0;
+}
+
+static int xdrv_remove(struct xenbus_device *dev)
+{
+ return 0;
+}
+
+static const struct xenbus_device_id xdrv_ids[] = {
+ { XENSND_DRIVER_NAME },
+ { "" }
+};
+
+static struct xenbus_driver xen_driver = {
+ .ids = xdrv_ids,
+ .probe = xdrv_probe,
+ .remove = xdrv_remove,
+ .otherend_changed = xdrv_be_on_changed,
+};
+
+static int __init xdrv_init(void)
+{
+ if (!xen_domain())
+ return -ENODEV;
+
+ pr_info("Initialising Xen " XENSND_DRIVER_NAME " frontend driver\n");
+ return xenbus_register_frontend(&xen_driver);
+}
+
+static void __exit xdrv_cleanup(void)
+{
+ pr_info("Unregistering Xen " XENSND_DRIVER_NAME " frontend driver\n");
+ xenbus_unregister_driver(&xen_driver);
+}
+
+module_init(xdrv_init);
+module_exit(xdrv_cleanup);
+
+MODULE_DESCRIPTION("Xen virtual sound device frontend");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("xen:"XENSND_DRIVER_NAME);
+MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual soundcard}}");
--
2.7.4
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