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- /*
- * 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 "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 device *dev)
- {
- 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, dev);
- 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);
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