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> |
| 24 | #include <linux/errno.h> |
| 25 | #include <sound/core.h> |
| 26 | |
| 27 | /** |
| 28 | * snd_device_new - create an ALSA device component |
| 29 | * @card: the card instance |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 30 | * @type: the device type, SNDRV_DEV_XXX |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * @device_data: the data pointer of this device |
| 32 | * @ops: the operator table |
| 33 | * |
| 34 | * Creates a new device component for the given data pointer. |
| 35 | * The device will be assigned to the card and managed together |
| 36 | * by the card. |
| 37 | * |
| 38 | * The data pointer plays a role as the identifier, too, so the |
| 39 | * pointer address must be unique and unchanged. |
| 40 | * |
| 41 | * Returns zero if successful, or a negative error code on failure. |
| 42 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 43 | int snd_device_new(struct snd_card *card, snd_device_type_t type, |
| 44 | void *device_data, struct snd_device_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 46 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 48 | snd_assert(card != NULL, return -ENXIO); |
| 49 | snd_assert(device_data != NULL, return -ENXIO); |
| 50 | snd_assert(ops != NULL, return -ENXIO); |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 51 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Takashi Iwai | 73e77ba | 2005-11-17 17:44:01 +0100 | [diff] [blame] | 52 | if (dev == NULL) { |
| 53 | snd_printk(KERN_ERR "Cannot allocate device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | return -ENOMEM; |
Takashi Iwai | 73e77ba | 2005-11-17 17:44:01 +0100 | [diff] [blame] | 55 | } |
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; |
| 61 | list_add(&dev->list, &card->devices); /* add to the head of list */ |
| 62 | return 0; |
| 63 | } |
| 64 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 65 | EXPORT_SYMBOL(snd_device_new); |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /** |
| 68 | * snd_device_free - release the device from the card |
| 69 | * @card: the card instance |
| 70 | * @device_data: the data pointer to release |
| 71 | * |
| 72 | * Removes the device from the list on the card and invokes the |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 73 | * callbacks, dev_disconnect and dev_free, corresponding to the state. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | * Then release the device. |
| 75 | * |
| 76 | * Returns zero if successful, or a negative error code on failure or if the |
| 77 | * device not found. |
| 78 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 79 | int snd_device_free(struct snd_card *card, void *device_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 81 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | snd_assert(card != NULL, return -ENXIO); |
| 84 | snd_assert(device_data != NULL, return -ENXIO); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 85 | list_for_each_entry(dev, &card->devices, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | if (dev->device_data != device_data) |
| 87 | continue; |
| 88 | /* unlink */ |
| 89 | list_del(&dev->list); |
Takashi Iwai | c461482 | 2006-06-23 14:38:23 +0200 | [diff] [blame] | 90 | if (dev->state == SNDRV_DEV_REGISTERED && |
| 91 | dev->ops->dev_disconnect) |
| 92 | if (dev->ops->dev_disconnect(dev)) |
| 93 | snd_printk(KERN_ERR |
| 94 | "device disconnect failure\n"); |
| 95 | if (dev->ops->dev_free) { |
| 96 | if (dev->ops->dev_free(dev)) |
| 97 | snd_printk(KERN_ERR "device free failure\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | kfree(dev); |
| 100 | return 0; |
| 101 | } |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 102 | snd_printd("device free %p (from %p), not found\n", device_data, |
| 103 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return -ENXIO; |
| 105 | } |
| 106 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 107 | EXPORT_SYMBOL(snd_device_free); |
| 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | /** |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 110 | * snd_device_disconnect - disconnect the device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | * @card: the card instance |
| 112 | * @device_data: the data pointer to disconnect |
| 113 | * |
| 114 | * Turns the device into the disconnection state, invoking |
| 115 | * dev_disconnect callback, if the device was already registered. |
| 116 | * |
| 117 | * Usually called from snd_card_disconnect(). |
| 118 | * |
| 119 | * Returns zero if successful, or a negative error code on failure or if the |
| 120 | * device not found. |
| 121 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 122 | int snd_device_disconnect(struct snd_card *card, void *device_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 124 | struct snd_device *dev; |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | snd_assert(card != NULL, return -ENXIO); |
| 127 | snd_assert(device_data != NULL, return -ENXIO); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 128 | list_for_each_entry(dev, &card->devices, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | if (dev->device_data != device_data) |
| 130 | continue; |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 131 | if (dev->state == SNDRV_DEV_REGISTERED && |
| 132 | dev->ops->dev_disconnect) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | if (dev->ops->dev_disconnect(dev)) |
| 134 | snd_printk(KERN_ERR "device disconnect failure\n"); |
| 135 | dev->state = SNDRV_DEV_DISCONNECTED; |
| 136 | } |
| 137 | return 0; |
| 138 | } |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 139 | snd_printd("device disconnect %p (from %p), not found\n", device_data, |
| 140 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | return -ENXIO; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * snd_device_register - register the device |
| 146 | * @card: the card instance |
| 147 | * @device_data: the data pointer to register |
| 148 | * |
| 149 | * Registers the device which was already created via |
| 150 | * snd_device_new(). Usually this is called from snd_card_register(), |
| 151 | * but it can be called later if any new devices are created after |
| 152 | * invocation of snd_card_register(). |
| 153 | * |
| 154 | * Returns zero if successful, or a negative error code on failure or if the |
| 155 | * device not found. |
| 156 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 157 | int snd_device_register(struct snd_card *card, void *device_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 159 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | int err; |
Henrik Kretzschmar | a3352f0 | 2005-06-29 19:30:42 +0200 | [diff] [blame] | 161 | |
| 162 | snd_assert(card != NULL, return -ENXIO); |
| 163 | snd_assert(device_data != NULL, return -ENXIO); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 164 | list_for_each_entry(dev, &card->devices, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (dev->device_data != device_data) |
| 166 | continue; |
| 167 | if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) { |
| 168 | if ((err = dev->ops->dev_register(dev)) < 0) |
| 169 | return err; |
| 170 | dev->state = SNDRV_DEV_REGISTERED; |
| 171 | return 0; |
| 172 | } |
Takashi Iwai | 73e77ba | 2005-11-17 17:44:01 +0100 | [diff] [blame] | 173 | snd_printd("snd_device_register busy\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | return -EBUSY; |
| 175 | } |
| 176 | snd_BUG(); |
| 177 | return -ENXIO; |
| 178 | } |
| 179 | |
Takashi Iwai | c0d3fb3 | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 180 | EXPORT_SYMBOL(snd_device_register); |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | /* |
| 183 | * register all the devices on the card. |
| 184 | * called from init.c |
| 185 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 186 | int snd_device_register_all(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 188 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | int err; |
| 190 | |
| 191 | snd_assert(card != NULL, return -ENXIO); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 192 | list_for_each_entry(dev, &card->devices, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) { |
| 194 | if ((err = dev->ops->dev_register(dev)) < 0) |
| 195 | return err; |
| 196 | dev->state = SNDRV_DEV_REGISTERED; |
| 197 | } |
| 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * disconnect all the devices on the card. |
| 204 | * called from init.c |
| 205 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 206 | int snd_device_disconnect_all(struct snd_card *card) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 208 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | int err = 0; |
| 210 | |
| 211 | snd_assert(card != NULL, return -ENXIO); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 212 | list_for_each_entry(dev, &card->devices, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | if (snd_device_disconnect(card, dev->device_data) < 0) |
| 214 | err = -ENXIO; |
| 215 | } |
| 216 | return err; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * release all the devices on the card. |
| 221 | * called from init.c |
| 222 | */ |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 223 | int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
Takashi Iwai | 512bbd6 | 2005-11-17 13:51:18 +0100 | [diff] [blame] | 225 | struct snd_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | int err; |
| 227 | unsigned int range_low, range_high; |
| 228 | |
| 229 | snd_assert(card != NULL, return -ENXIO); |
| 230 | range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE; |
| 231 | range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1; |
| 232 | __again: |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 233 | list_for_each_entry(dev, &card->devices, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | if (dev->type >= range_low && dev->type <= range_high) { |
| 235 | if ((err = snd_device_free(card, dev->device_data)) < 0) |
| 236 | return err; |
| 237 | goto __again; |
| 238 | } |
| 239 | } |
| 240 | return 0; |
| 241 | } |