162 lines
3.3 KiB
C
162 lines
3.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Apple Onboard Audio driver core
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*
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* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include "../aoa.h"
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#include "alsa.h"
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MODULE_DESCRIPTION("Apple Onboard Audio Sound Driver");
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MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
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MODULE_LICENSE("GPL");
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/* We allow only one fabric. This simplifies things,
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* and more don't really make that much sense */
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static struct aoa_fabric *fabric;
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static LIST_HEAD(codec_list);
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static int attach_codec_to_fabric(struct aoa_codec *c)
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{
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int err;
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if (!try_module_get(c->owner))
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return -EBUSY;
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/* found_codec has to be assigned */
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err = -ENOENT;
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if (fabric->found_codec)
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err = fabric->found_codec(c);
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if (err) {
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module_put(c->owner);
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printk(KERN_ERR "snd-aoa: fabric didn't like codec %s\n",
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c->name);
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return err;
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}
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c->fabric = fabric;
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err = 0;
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if (c->init)
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err = c->init(c);
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if (err) {
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printk(KERN_ERR "snd-aoa: codec %s didn't init\n", c->name);
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c->fabric = NULL;
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if (fabric->remove_codec)
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fabric->remove_codec(c);
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module_put(c->owner);
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return err;
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}
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if (fabric->attached_codec)
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fabric->attached_codec(c);
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return 0;
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}
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int aoa_codec_register(struct aoa_codec *codec)
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{
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int err = 0;
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/* if there's a fabric already, we can tell if we
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* will want to have this codec, so propagate error
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* through. Otherwise, this will happen later... */
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if (fabric)
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err = attach_codec_to_fabric(codec);
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if (!err)
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list_add(&codec->list, &codec_list);
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return err;
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}
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EXPORT_SYMBOL_GPL(aoa_codec_register);
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void aoa_codec_unregister(struct aoa_codec *codec)
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{
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list_del(&codec->list);
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if (codec->fabric && codec->exit)
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codec->exit(codec);
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if (fabric && fabric->remove_codec)
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fabric->remove_codec(codec);
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codec->fabric = NULL;
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module_put(codec->owner);
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}
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EXPORT_SYMBOL_GPL(aoa_codec_unregister);
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int aoa_fabric_register(struct aoa_fabric *new_fabric, struct device *dev)
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{
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struct aoa_codec *c;
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int err;
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/* allow querying for presence of fabric
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* (i.e. do this test first!) */
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if (new_fabric == fabric) {
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err = -EALREADY;
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goto attach;
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}
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if (fabric)
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return -EEXIST;
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if (!new_fabric)
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return -EINVAL;
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err = aoa_alsa_init(new_fabric->name, new_fabric->owner, dev);
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if (err)
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return err;
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fabric = new_fabric;
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attach:
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list_for_each_entry(c, &codec_list, list) {
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if (c->fabric != fabric)
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attach_codec_to_fabric(c);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(aoa_fabric_register);
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void aoa_fabric_unregister(struct aoa_fabric *old_fabric)
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{
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struct aoa_codec *c;
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if (fabric != old_fabric)
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return;
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list_for_each_entry(c, &codec_list, list) {
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if (c->fabric)
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aoa_fabric_unlink_codec(c);
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}
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aoa_alsa_cleanup();
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fabric = NULL;
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}
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EXPORT_SYMBOL_GPL(aoa_fabric_unregister);
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void aoa_fabric_unlink_codec(struct aoa_codec *codec)
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{
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if (!codec->fabric) {
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printk(KERN_ERR "snd-aoa: fabric unassigned "
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"in aoa_fabric_unlink_codec\n");
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dump_stack();
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return;
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}
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if (codec->exit)
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codec->exit(codec);
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if (codec->fabric->remove_codec)
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codec->fabric->remove_codec(codec);
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codec->fabric = NULL;
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module_put(codec->owner);
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}
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EXPORT_SYMBOL_GPL(aoa_fabric_unlink_codec);
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static int __init aoa_init(void)
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{
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return 0;
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}
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static void __exit aoa_exit(void)
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{
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aoa_alsa_cleanup();
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}
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module_init(aoa_init);
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module_exit(aoa_exit);
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