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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Apple Onboard Audio driver core4 *5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>6 */7 8#include <linux/init.h>9#include <linux/module.h>10#include <linux/list.h>11#include "../aoa.h"12#include "alsa.h"13 14MODULE_DESCRIPTION("Apple Onboard Audio Sound Driver");15MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");16MODULE_LICENSE("GPL");17 18/* We allow only one fabric. This simplifies things,19 * and more don't really make that much sense */20static struct aoa_fabric *fabric;21static LIST_HEAD(codec_list);22 23static int attach_codec_to_fabric(struct aoa_codec *c)24{25 int err;26 27 if (!try_module_get(c->owner))28 return -EBUSY;29 /* found_codec has to be assigned */30 err = -ENOENT;31 if (fabric->found_codec)32 err = fabric->found_codec(c);33 if (err) {34 module_put(c->owner);35 printk(KERN_ERR "snd-aoa: fabric didn't like codec %s\n",36 c->name);37 return err;38 }39 c->fabric = fabric;40 41 err = 0;42 if (c->init)43 err = c->init(c);44 if (err) {45 printk(KERN_ERR "snd-aoa: codec %s didn't init\n", c->name);46 c->fabric = NULL;47 if (fabric->remove_codec)48 fabric->remove_codec(c);49 module_put(c->owner);50 return err;51 }52 if (fabric->attached_codec)53 fabric->attached_codec(c);54 return 0;55}56 57int aoa_codec_register(struct aoa_codec *codec)58{59 int err = 0;60 61 /* if there's a fabric already, we can tell if we62 * will want to have this codec, so propagate error63 * through. Otherwise, this will happen later... */64 if (fabric)65 err = attach_codec_to_fabric(codec);66 if (!err)67 list_add(&codec->list, &codec_list);68 return err;69}70EXPORT_SYMBOL_GPL(aoa_codec_register);71 72void aoa_codec_unregister(struct aoa_codec *codec)73{74 list_del(&codec->list);75 if (codec->fabric && codec->exit)76 codec->exit(codec);77 if (fabric && fabric->remove_codec)78 fabric->remove_codec(codec);79 codec->fabric = NULL;80 module_put(codec->owner);81}82EXPORT_SYMBOL_GPL(aoa_codec_unregister);83 84int aoa_fabric_register(struct aoa_fabric *new_fabric, struct device *dev)85{86 struct aoa_codec *c;87 int err;88 89 /* allow querying for presence of fabric90 * (i.e. do this test first!) */91 if (new_fabric == fabric) {92 err = -EALREADY;93 goto attach;94 }95 if (fabric)96 return -EEXIST;97 if (!new_fabric)98 return -EINVAL;99 100 err = aoa_alsa_init(new_fabric->name, new_fabric->owner, dev);101 if (err)102 return err;103 104 fabric = new_fabric;105 106 attach:107 list_for_each_entry(c, &codec_list, list) {108 if (c->fabric != fabric)109 attach_codec_to_fabric(c);110 }111 return err;112}113EXPORT_SYMBOL_GPL(aoa_fabric_register);114 115void aoa_fabric_unregister(struct aoa_fabric *old_fabric)116{117 struct aoa_codec *c;118 119 if (fabric != old_fabric)120 return;121 122 list_for_each_entry(c, &codec_list, list) {123 if (c->fabric)124 aoa_fabric_unlink_codec(c);125 }126 127 aoa_alsa_cleanup();128 129 fabric = NULL;130}131EXPORT_SYMBOL_GPL(aoa_fabric_unregister);132 133void aoa_fabric_unlink_codec(struct aoa_codec *codec)134{135 if (!codec->fabric) {136 printk(KERN_ERR "snd-aoa: fabric unassigned "137 "in aoa_fabric_unlink_codec\n");138 dump_stack();139 return;140 }141 if (codec->exit)142 codec->exit(codec);143 if (codec->fabric->remove_codec)144 codec->fabric->remove_codec(codec);145 codec->fabric = NULL;146 module_put(codec->owner);147}148EXPORT_SYMBOL_GPL(aoa_fabric_unlink_codec);149 150static int __init aoa_init(void)151{152 return 0;153}154 155static void __exit aoa_exit(void)156{157 aoa_alsa_cleanup();158}159 160module_init(aoa_init);161module_exit(aoa_exit);162