ALSA: hdac_ext: add extended HDA bus

The new HDA controllers from Intel support new capabilities like
multilink, pipe processing, SPIB, GTS etc In order to use them we
create an extended HDA bus which embed the hdac bus and contains the
fields for extended configurations

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 120 insertions, 0 deletions

diff --git a/sound/hda/ext/Makefile b/sound/hda/ext/Makefile
new file mode 100644
index 0000000..2e583e6
--- /dev/null
+++ b/sound/hda/ext/Makefile
@@ -0,0 +1,3 @@
+snd-hda-ext-core-objs := hdac_ext_bus.o
+
+obj-$(CONFIG_SND_HDA_EXT_CORE) += snd-hda-ext-core.o
diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
new file mode 100644
index 0000000..f1100354
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -0,0 +1,117 @@
+/*
+ *  hdac-ext-bus.c - HD-audio extended core bus functions.
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Jeeja KP <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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; version 2 of the License.
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <sound/hdaudio_ext.h>
+
+MODULE_DESCRIPTION("HDA extended core");
+MODULE_LICENSE("GPL v2");
+
+/**
+ * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
+ * @ebus: the pointer to extended bus object
+ * @dev: device pointer
+ * @ops: bus verb operators
+ * @io_ops: lowlevel I/O operators
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
+			const struct hdac_bus_ops *ops,
+			const struct hdac_io_ops *io_ops)
+{
+	int ret;
+	static int idx;
+
+	ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
+	if (ret < 0)
+		return ret;
+
+	INIT_LIST_HEAD(&ebus->hlink_list);
+	ebus->idx = idx++;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
+
+/**
+ * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
+ * @ebus: the pointer to extended bus object
+ */
+void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
+{
+	snd_hdac_bus_exit(&ebus->bus);
+	WARN_ON(!list_empty(&ebus->hlink_list));
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
+
+static void default_release(struct device *dev)
+{
+	snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
+}
+
+/**
+ * snd_hdac_ext_device_init - initialize the HDA extended codec base device
+ * @ebus: hdac extended bus to attach to
+ * @addr: codec address
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
+{
+	struct hdac_device *hdev = NULL;
+	struct hdac_bus *bus = ebus_to_hbus(ebus);
+	char name[15];
+	int ret;
+
+	hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
+	if (!hdev)
+		return -ENOMEM;
+
+	snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);
+
+	ret  = snd_hdac_device_init(hdev, bus, name, addr);
+	if (ret < 0) {
+		dev_err(bus->dev, "device init failed for hdac device\n");
+		return ret;
+	}
+	hdev->type = HDA_DEV_ASOC;
+	hdev->dev.release = default_release;
+
+	ret = snd_hdac_device_register(hdev);
+	if (ret) {
+		dev_err(bus->dev, "failed to register hdac device\n");
+		snd_hdac_ext_bus_device_exit(hdev);
+		return ret;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
+
+/**
+ * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
+ * @hdev: hdac device to clean up
+ */
+void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
+{
+	snd_hdac_device_exit(hdev);
+	kfree(hdev);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);