Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Apple Onboard Audio driver core |
| 3 | * |
| 4 | * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> |
| 5 | * |
| 6 | * GPL v2, can be found in COPYING. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/list.h> |
| 12 | #include "../aoa.h" |
Johannes Berg | 888dcb7 | 2008-10-23 15:47:56 +0200 | [diff] [blame] | 13 | #include "alsa.h" |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 14 | |
| 15 | MODULE_DESCRIPTION("Apple Onboard Audio Sound Driver"); |
| 16 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); |
| 17 | MODULE_LICENSE("GPL"); |
| 18 | |
| 19 | /* We allow only one fabric. This simplifies things, |
| 20 | * and more don't really make that much sense */ |
| 21 | static struct aoa_fabric *fabric; |
| 22 | static LIST_HEAD(codec_list); |
| 23 | |
| 24 | static int attach_codec_to_fabric(struct aoa_codec *c) |
| 25 | { |
| 26 | int err; |
| 27 | |
| 28 | if (!try_module_get(c->owner)) |
| 29 | return -EBUSY; |
| 30 | /* found_codec has to be assigned */ |
| 31 | err = -ENOENT; |
| 32 | if (fabric->found_codec) |
| 33 | err = fabric->found_codec(c); |
| 34 | if (err) { |
| 35 | module_put(c->owner); |
| 36 | printk(KERN_ERR "snd-aoa: fabric didn't like codec %s\n", |
| 37 | c->name); |
| 38 | return err; |
| 39 | } |
| 40 | c->fabric = fabric; |
| 41 | |
| 42 | err = 0; |
| 43 | if (c->init) |
| 44 | err = c->init(c); |
| 45 | if (err) { |
| 46 | printk(KERN_ERR "snd-aoa: codec %s didn't init\n", c->name); |
| 47 | c->fabric = NULL; |
| 48 | if (fabric->remove_codec) |
| 49 | fabric->remove_codec(c); |
| 50 | module_put(c->owner); |
| 51 | return err; |
| 52 | } |
| 53 | if (fabric->attached_codec) |
| 54 | fabric->attached_codec(c); |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | int aoa_codec_register(struct aoa_codec *codec) |
| 59 | { |
| 60 | int err = 0; |
| 61 | |
| 62 | /* if there's a fabric already, we can tell if we |
| 63 | * will want to have this codec, so propagate error |
| 64 | * through. Otherwise, this will happen later... */ |
| 65 | if (fabric) |
| 66 | err = attach_codec_to_fabric(codec); |
| 67 | if (!err) |
| 68 | list_add(&codec->list, &codec_list); |
| 69 | return err; |
| 70 | } |
| 71 | EXPORT_SYMBOL_GPL(aoa_codec_register); |
| 72 | |
| 73 | void aoa_codec_unregister(struct aoa_codec *codec) |
| 74 | { |
| 75 | list_del(&codec->list); |
| 76 | if (codec->fabric && codec->exit) |
| 77 | codec->exit(codec); |
| 78 | if (fabric && fabric->remove_codec) |
| 79 | fabric->remove_codec(codec); |
| 80 | codec->fabric = NULL; |
| 81 | module_put(codec->owner); |
| 82 | } |
| 83 | EXPORT_SYMBOL_GPL(aoa_codec_unregister); |
| 84 | |
Olaf Hering | 61e7710 | 2006-12-07 08:24:12 +0100 | [diff] [blame] | 85 | int aoa_fabric_register(struct aoa_fabric *new_fabric, struct device *dev) |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 86 | { |
| 87 | struct aoa_codec *c; |
| 88 | int err; |
| 89 | |
| 90 | /* allow querying for presence of fabric |
| 91 | * (i.e. do this test first!) */ |
| 92 | if (new_fabric == fabric) { |
| 93 | err = -EALREADY; |
| 94 | goto attach; |
| 95 | } |
| 96 | if (fabric) |
| 97 | return -EEXIST; |
| 98 | if (!new_fabric) |
| 99 | return -EINVAL; |
| 100 | |
Olaf Hering | 61e7710 | 2006-12-07 08:24:12 +0100 | [diff] [blame] | 101 | err = aoa_alsa_init(new_fabric->name, new_fabric->owner, dev); |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 102 | if (err) |
| 103 | return err; |
| 104 | |
| 105 | fabric = new_fabric; |
| 106 | |
| 107 | attach: |
| 108 | list_for_each_entry(c, &codec_list, list) { |
| 109 | if (c->fabric != fabric) |
| 110 | attach_codec_to_fabric(c); |
| 111 | } |
| 112 | return err; |
| 113 | } |
| 114 | EXPORT_SYMBOL_GPL(aoa_fabric_register); |
| 115 | |
| 116 | void aoa_fabric_unregister(struct aoa_fabric *old_fabric) |
| 117 | { |
| 118 | struct aoa_codec *c; |
| 119 | |
| 120 | if (fabric != old_fabric) |
| 121 | return; |
| 122 | |
| 123 | list_for_each_entry(c, &codec_list, list) { |
| 124 | if (c->fabric) |
| 125 | aoa_fabric_unlink_codec(c); |
| 126 | } |
| 127 | |
| 128 | aoa_alsa_cleanup(); |
| 129 | |
| 130 | fabric = NULL; |
| 131 | } |
| 132 | EXPORT_SYMBOL_GPL(aoa_fabric_unregister); |
| 133 | |
| 134 | void aoa_fabric_unlink_codec(struct aoa_codec *codec) |
| 135 | { |
| 136 | if (!codec->fabric) { |
| 137 | printk(KERN_ERR "snd-aoa: fabric unassigned " |
| 138 | "in aoa_fabric_unlink_codec\n"); |
| 139 | dump_stack(); |
| 140 | return; |
| 141 | } |
| 142 | if (codec->exit) |
| 143 | codec->exit(codec); |
| 144 | if (codec->fabric->remove_codec) |
| 145 | codec->fabric->remove_codec(codec); |
| 146 | codec->fabric = NULL; |
| 147 | module_put(codec->owner); |
| 148 | } |
| 149 | EXPORT_SYMBOL_GPL(aoa_fabric_unlink_codec); |
| 150 | |
| 151 | static int __init aoa_init(void) |
| 152 | { |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static void __exit aoa_exit(void) |
| 157 | { |
| 158 | aoa_alsa_cleanup(); |
| 159 | } |
| 160 | |
| 161 | module_init(aoa_init); |
| 162 | module_exit(aoa_exit); |