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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | // SPDX-License-Identifier: GPL-2.0-only /* * Apple Onboard Audio driver core * * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> */ #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); |