Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Device management routines |
Jaroslav Kysela | c1017a4 | 2007-10-15 09:50:19 +0200 | [diff] [blame] | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/slab.h> |
| 23 | #include <linux/time.h> |
Paul Gortmaker | d81a6d7 | 2011-09-22 09:34:58 -0400 | [diff] [blame] | 24 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/errno.h> |
| 26 | #include <sound/core.h> |
| 27 | |
| 28 | /** |
| 29 | * snd_device_new - create an ALSA device component |
| 30 | * @card: the card instance |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 31 | * @type: the device type, SNDRV_DEV_XXX |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * @device_data: the data pointer of this device |
| 33 | * @ops: the operator table |
| 34 | * |
| 35 | * Creates a new device component for the given data pointer. |
| 36 | * The device will be assigned to the card and managed together |
| 37 | * by the card. |
| 38 | * |
| 39 | * The data pointer plays a role as the identifier, too, so the |
| 40 | * pointer address must be unique and unchanged. |
| 41 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 42 | * Return: Zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | */ |
Takashi Iwai | 9ce5054 | 2014-01-29 15:13:33 +0100 | [diff] [blame] | 44 | int snd_device_new(struct snd_card *card, enum snd_device_type type, |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 45 | void *device_data, struct snd_device_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 47 | struct snd_device *dev; |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 48 | struct list_head *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 50 | if (snd_BUG_ON(!card || !device_data || !ops)) |
| 51 | return -ENXIO; |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 52 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Takashi Iwai | ec0e993 | 2015-03-10 15:42:14 +0100 | [diff] [blame^] | 53 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | return -ENOMEM; |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 55 | INIT_LIST_HEAD(&dev->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | dev->card = card; |
| 57 | dev->type = type; |
| 58 | dev->state = SNDRV_DEV_BUILD; |
| 59 | dev->device_data = device_data; |
| 60 | dev->ops = ops; |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 61 | |
| 62 | /* insert the entry in an incrementally sorted list */ |
| 63 | list_for_each_prev(p, &card->devices) { |
| 64 | struct snd_device *pdev = list_entry(p, struct snd_device, list); |
| 65 | if ((unsigned int)pdev->type <= (unsigned int)type) |
| 66 | break; |
| 67 | } |
| 68 | |
| 69 | list_add(&dev->list, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | return 0; |
| 71 | } |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 72 | EXPORT_SYMBOL(snd_device_new); |
| 73 | |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 74 | static int __snd_device_disconnect(struct snd_device *dev) |
| 75 | { |
| 76 | if (dev->state == SNDRV_DEV_REGISTERED) { |
| 77 | if (dev->ops->dev_disconnect && |
| 78 | dev->ops->dev_disconnect(dev)) |
| 79 | dev_err(dev->card->dev, "device disconnect failure\n"); |
| 80 | dev->state = SNDRV_DEV_DISCONNECTED; |
| 81 | } |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static void __snd_device_free(struct snd_device *dev) |
| 86 | { |
| 87 | /* unlink */ |
| 88 | list_del(&dev->list); |
| 89 | |
| 90 | __snd_device_disconnect(dev); |
| 91 | if (dev->ops->dev_free) { |
| 92 | if (dev->ops->dev_free(dev)) |
| 93 | dev_err(dev->card->dev, "device free failure\n"); |
| 94 | } |
| 95 | kfree(dev); |
| 96 | } |
| 97 | |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 98 | static struct snd_device *look_for_dev(struct snd_card *card, void *device_data) |
| 99 | { |
| 100 | struct snd_device *dev; |
| 101 | |
| 102 | list_for_each_entry(dev, &card->devices, list) |
| 103 | if (dev->device_data == device_data) |
| 104 | return dev; |
| 105 | |
| 106 | return NULL; |
| 107 | } |
| 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | /** |
| 110 | * snd_device_free - release the device from the card |
| 111 | * @card: the card instance |
| 112 | * @device_data: the data pointer to release |
| 113 | * |
| 114 | * Removes the device from the list on the card and invokes the |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 115 | * callbacks, dev_disconnect and dev_free, corresponding to the state. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | * Then release the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | */ |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 118 | void snd_device_free(struct snd_card *card, void *device_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 120 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 122 | if (snd_BUG_ON(!card || !device_data)) |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 123 | return; |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 124 | dev = look_for_dev(card, device_data); |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 125 | if (dev) |
| 126 | __snd_device_free(dev); |
| 127 | else |
| 128 | dev_dbg(card->dev, "device free %p (from %pF), not found\n", |
| 129 | device_data, __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 131 | EXPORT_SYMBOL(snd_device_free); |
| 132 | |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 133 | static int __snd_device_register(struct snd_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 135 | if (dev->state == SNDRV_DEV_BUILD) { |
| 136 | if (dev->ops->dev_register) { |
| 137 | int err = dev->ops->dev_register(dev); |
| 138 | if (err < 0) |
| 139 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 141 | dev->state = SNDRV_DEV_REGISTERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 143 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | /** |
| 147 | * snd_device_register - register the device |
| 148 | * @card: the card instance |
| 149 | * @device_data: the data pointer to register |
| 150 | * |
| 151 | * Registers the device which was already created via |
| 152 | * snd_device_new(). Usually this is called from snd_card_register(), |
| 153 | * but it can be called later if any new devices are created after |
| 154 | * invocation of snd_card_register(). |
| 155 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 156 | * Return: Zero if successful, or a negative error code on failure or if the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | * device not found. |
| 158 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 159 | int snd_device_register(struct snd_card *card, void *device_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 161 | struct snd_device *dev; |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 162 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 163 | if (snd_BUG_ON(!card || !device_data)) |
| 164 | return -ENXIO; |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 165 | dev = look_for_dev(card, device_data); |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 166 | if (dev) |
| 167 | return __snd_device_register(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | snd_BUG(); |
| 169 | return -ENXIO; |
| 170 | } |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 171 | EXPORT_SYMBOL(snd_device_register); |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | /* |
| 174 | * register all the devices on the card. |
| 175 | * called from init.c |
| 176 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 177 | int snd_device_register_all(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 179 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | int err; |
| 181 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 182 | if (snd_BUG_ON(!card)) |
| 183 | return -ENXIO; |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 184 | list_for_each_entry(dev, &card->devices, list) { |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 185 | err = __snd_device_register(dev); |
| 186 | if (err < 0) |
| 187 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * disconnect all the devices on the card. |
| 194 | * called from init.c |
| 195 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 196 | int snd_device_disconnect_all(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 198 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | int err = 0; |
| 200 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 201 | if (snd_BUG_ON(!card)) |
| 202 | return -ENXIO; |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 203 | list_for_each_entry_reverse(dev, &card->devices, list) { |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 204 | if (__snd_device_disconnect(dev) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | err = -ENXIO; |
| 206 | } |
| 207 | return err; |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * release all the devices on the card. |
| 212 | * called from init.c |
| 213 | */ |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 214 | void snd_device_free_all(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
Takashi Iwai | 289ca02 | 2014-01-29 15:53:35 +0100 | [diff] [blame] | 216 | struct snd_device *dev, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 218 | if (snd_BUG_ON(!card)) |
Takashi Iwai | 72620d6 | 2014-02-04 11:36:11 +0100 | [diff] [blame] | 219 | return; |
| 220 | list_for_each_entry_safe_reverse(dev, next, &card->devices, list) |
| 221 | __snd_device_free(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |