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authorTakashi Iwai <tiwai@suse.de>2015-02-17 21:46:37 +0100
committerTakashi Iwai <tiwai@suse.de>2015-03-23 13:15:51 +0100
commite3d280fc6d42017b2379503fbda83655a05294fe (patch)
treecc89c4b22054d620163f0d6bdad901f43957dbf5 /sound/hda
parent3372dbdd8ca11f51be8c6a30b2bc79eb04c4a902 (diff)
ALSA: hda - Make snd_hda_bus_type public
Define the common hd-audio driver and device types to bind over snd_hda_bus_type publicly. This allows to implement other type of device and driver code over hd-audio bus. Now both struct hda_codec and struct hda_codec_driver inherit these new struct hdac_device and struct hdac_driver, respectively. The bus registration is done in subsys_initcall() to assure it before any other driver registrations. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda')
-rw-r--r--sound/hda/Kconfig2
-rw-r--r--sound/hda/Makefile3
-rw-r--r--sound/hda/hda_bus_type.c42
3 files changed, 47 insertions, 0 deletions
diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig
new file mode 100644
index 000000000000..4f428ccf64ad
--- /dev/null
+++ b/sound/hda/Kconfig
@@ -0,0 +1,2 @@
+config SND_HDA_CORE
+ tristate
diff --git a/sound/hda/Makefile b/sound/hda/Makefile
new file mode 100644
index 000000000000..59c8d1feb5aa
--- /dev/null
+++ b/sound/hda/Makefile
@@ -0,0 +1,3 @@
+snd-hda-core-objs := hda_bus_type.o
+
+obj-$(CONFIG_SND_HDA_CORE) += snd-hda-core.o
diff --git a/sound/hda/hda_bus_type.c b/sound/hda/hda_bus_type.c
new file mode 100644
index 000000000000..519914a12e8a
--- /dev/null
+++ b/sound/hda/hda_bus_type.c
@@ -0,0 +1,42 @@
+/*
+ * HD-audio bus
+ */
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <sound/hdaudio.h>
+
+MODULE_DESCRIPTION("HD-audio bus");
+MODULE_LICENSE("GPL");
+
+static int hda_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct hdac_device *hdev = dev_to_hdac_dev(dev);
+ struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
+
+ if (hdev->type != hdrv->type)
+ return 0;
+ if (hdrv->match)
+ return hdrv->match(hdev, hdrv);
+ return 1;
+}
+
+struct bus_type snd_hda_bus_type = {
+ .name = "hdaudio",
+ .match = hda_bus_match,
+};
+EXPORT_SYMBOL_GPL(snd_hda_bus_type);
+
+static int __init hda_bus_init(void)
+{
+ return bus_register(&snd_hda_bus_type);
+}
+
+static void __exit hda_bus_exit(void)
+{
+ bus_unregister(&snd_hda_bus_type);
+}
+
+subsys_initcall(hda_bus_init);
+module_exit(hda_bus_exit);