This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / sound / aoa / core / snd-aoa-core.c

diff --git a/sound/aoa/core/snd-aoa-core.c b/sound/aoa/core/snd-aoa-core.c
new file mode 100644 (file)
index 0000000..ecd2d82
--- /dev/null
+++ b/sound/aoa/core/snd-aoa-core.c
@@ -0,0 +1,162 @@
+/*
+ * Apple Onboard Audio driver core
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include "../aoa.h"
+#include "snd-aoa-alsa.h"
+
+MODULE_DESCRIPTION("Apple Onboard Audio Sound Driver");
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+
+/* We allow only one fabric. This simplifies things,
+ * and more don't really make that much sense */
+static struct aoa_fabric *fabric;
+static LIST_HEAD(codec_list);
+
+static int attach_codec_to_fabric(struct aoa_codec *c)
+{
+       int err;
+
+       if (!try_module_get(c->owner))
+               return -EBUSY;
+       /* found_codec has to be assigned */
+       err = -ENOENT;
+       if (fabric->found_codec)
+               err = fabric->found_codec(c);
+       if (err) {
+               module_put(c->owner);
+               printk(KERN_ERR "snd-aoa: fabric didn't like codec %s\n",
+                               c->name);
+               return err;
+       }
+       c->fabric = fabric;
+
+       err = 0;
+       if (c->init)
+               err = c->init(c);
+       if (err) {
+               printk(KERN_ERR "snd-aoa: codec %s didn't init\n", c->name);
+               c->fabric = NULL;
+               if (fabric->remove_codec)
+                       fabric->remove_codec(c);
+               module_put(c->owner);
+               return err;
+       }
+       if (fabric->attached_codec)
+               fabric->attached_codec(c);
+       return 0;
+}
+
+int aoa_codec_register(struct aoa_codec *codec)
+{
+       int err = 0;
+
+       /* if there's a fabric already, we can tell if we
+        * will want to have this codec, so propagate error
+        * through. Otherwise, this will happen later... */
+       if (fabric)
+               err = attach_codec_to_fabric(codec);
+       if (!err)
+               list_add(&codec->list, &codec_list);
+       return err;
+}
+EXPORT_SYMBOL_GPL(aoa_codec_register);
+
+void aoa_codec_unregister(struct aoa_codec *codec)
+{
+       list_del(&codec->list);
+       if (codec->fabric && codec->exit)
+               codec->exit(codec);
+       if (fabric && fabric->remove_codec)
+               fabric->remove_codec(codec);
+       codec->fabric = NULL;
+       module_put(codec->owner);
+}
+EXPORT_SYMBOL_GPL(aoa_codec_unregister);
+
+int aoa_fabric_register(struct aoa_fabric *new_fabric)
+{
+       struct aoa_codec *c;
+       int err;
+
+       /* allow querying for presence of fabric
+        * (i.e. do this test first!) */
+       if (new_fabric == fabric) {
+               err = -EALREADY;
+               goto attach;
+       }
+       if (fabric)
+               return -EEXIST;
+       if (!new_fabric)
+               return -EINVAL;
+
+       err = aoa_alsa_init(new_fabric->name, new_fabric->owner);
+       if (err)
+               return err;
+
+       fabric = new_fabric;
+
+ attach:
+       list_for_each_entry(c, &codec_list, list) {
+               if (c->fabric != fabric)
+                       attach_codec_to_fabric(c);
+       }
+       return err;
+}
+EXPORT_SYMBOL_GPL(aoa_fabric_register);
+
+void aoa_fabric_unregister(struct aoa_fabric *old_fabric)
+{
+       struct aoa_codec *c;
+
+       if (fabric != old_fabric)
+               return;
+
+       list_for_each_entry(c, &codec_list, list) {
+               if (c->fabric)
+                       aoa_fabric_unlink_codec(c);
+       }
+
+       aoa_alsa_cleanup();
+
+       fabric = NULL;
+}
+EXPORT_SYMBOL_GPL(aoa_fabric_unregister);
+
+void aoa_fabric_unlink_codec(struct aoa_codec *codec)
+{
+       if (!codec->fabric) {
+               printk(KERN_ERR "snd-aoa: fabric unassigned "
+                               "in aoa_fabric_unlink_codec\n");
+               dump_stack();
+               return;
+       }
+       if (codec->exit)
+               codec->exit(codec);
+       if (codec->fabric->remove_codec)
+               codec->fabric->remove_codec(codec);
+       codec->fabric = NULL;
+       module_put(codec->owner);
+}
+EXPORT_SYMBOL_GPL(aoa_fabric_unlink_codec);
+
+static int __init aoa_init(void)
+{
+       return 0;
+}
+
+static void __exit aoa_exit(void)
+{
+       aoa_alsa_cleanup();
+}
+
+module_init(aoa_init);
+module_exit(aoa_exit);