2 * Device management routines
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
22 #include <linux/slab.h>
23 #include <linux/time.h>
24 #include <linux/errno.h>
25 #include <sound/core.h>
28 * snd_device_new - create an ALSA device component
29 * @card: the card instance
30 * @type: the device type, SNDRV_DEV_XXX
31 * @device_data: the data pointer of this device
32 * @ops: the operator table
34 * Creates a new device component for the given data pointer.
35 * The device will be assigned to the card and managed together
38 * The data pointer plays a role as the identifier, too, so the
39 * pointer address must be unique and unchanged.
41 * Returns zero if successful, or a negative error code on failure.
43 int snd_device_new(struct snd_card *card, snd_device_type_t type,
44 void *device_data, struct snd_device_ops *ops)
46 struct snd_device *dev;
48 if (snd_BUG_ON(!card || !device_data || !ops))
50 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
52 snd_printk(KERN_ERR "Cannot allocate device\n");
57 dev->state = SNDRV_DEV_BUILD;
58 dev->device_data = device_data;
60 list_add(&dev->list, &card->devices); /* add to the head of list */
64 EXPORT_SYMBOL(snd_device_new);
67 * snd_device_free - release the device from the card
68 * @card: the card instance
69 * @device_data: the data pointer to release
71 * Removes the device from the list on the card and invokes the
72 * callbacks, dev_disconnect and dev_free, corresponding to the state.
73 * Then release the device.
75 * Returns zero if successful, or a negative error code on failure or if the
78 int snd_device_free(struct snd_card *card, void *device_data)
80 struct snd_device *dev;
82 if (snd_BUG_ON(!card || !device_data))
84 list_for_each_entry(dev, &card->devices, list) {
85 if (dev->device_data != device_data)
89 if (dev->state == SNDRV_DEV_REGISTERED &&
90 dev->ops->dev_disconnect)
91 if (dev->ops->dev_disconnect(dev))
93 "device disconnect failure\n");
94 if (dev->ops->dev_free) {
95 if (dev->ops->dev_free(dev))
96 snd_printk(KERN_ERR "device free failure\n");
101 snd_printd("device free %p (from %pF), not found\n", device_data,
102 __builtin_return_address(0));
106 EXPORT_SYMBOL(snd_device_free);
109 * snd_device_disconnect - disconnect the device
110 * @card: the card instance
111 * @device_data: the data pointer to disconnect
113 * Turns the device into the disconnection state, invoking
114 * dev_disconnect callback, if the device was already registered.
116 * Usually called from snd_card_disconnect().
118 * Returns zero if successful, or a negative error code on failure or if the
121 int snd_device_disconnect(struct snd_card *card, void *device_data)
123 struct snd_device *dev;
125 if (snd_BUG_ON(!card || !device_data))
127 list_for_each_entry(dev, &card->devices, list) {
128 if (dev->device_data != device_data)
130 if (dev->state == SNDRV_DEV_REGISTERED &&
131 dev->ops->dev_disconnect) {
132 if (dev->ops->dev_disconnect(dev))
133 snd_printk(KERN_ERR "device disconnect failure\n");
134 dev->state = SNDRV_DEV_DISCONNECTED;
138 snd_printd("device disconnect %p (from %pF), not found\n", device_data,
139 __builtin_return_address(0));
144 * snd_device_register - register the device
145 * @card: the card instance
146 * @device_data: the data pointer to register
148 * Registers the device which was already created via
149 * snd_device_new(). Usually this is called from snd_card_register(),
150 * but it can be called later if any new devices are created after
151 * invocation of snd_card_register().
153 * Returns zero if successful, or a negative error code on failure or if the
156 int snd_device_register(struct snd_card *card, void *device_data)
158 struct snd_device *dev;
161 if (snd_BUG_ON(!card || !device_data))
163 list_for_each_entry(dev, &card->devices, list) {
164 if (dev->device_data != device_data)
166 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
167 if ((err = dev->ops->dev_register(dev)) < 0)
169 dev->state = SNDRV_DEV_REGISTERED;
172 snd_printd("snd_device_register busy\n");
179 EXPORT_SYMBOL(snd_device_register);
182 * register all the devices on the card.
185 int snd_device_register_all(struct snd_card *card)
187 struct snd_device *dev;
190 if (snd_BUG_ON(!card))
192 list_for_each_entry(dev, &card->devices, list) {
193 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
194 if ((err = dev->ops->dev_register(dev)) < 0)
196 dev->state = SNDRV_DEV_REGISTERED;
203 * disconnect all the devices on the card.
206 int snd_device_disconnect_all(struct snd_card *card)
208 struct snd_device *dev;
211 if (snd_BUG_ON(!card))
213 list_for_each_entry(dev, &card->devices, list) {
214 if (snd_device_disconnect(card, dev->device_data) < 0)
221 * release all the devices on the card.
224 int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
226 struct snd_device *dev;
228 unsigned int range_low, range_high;
230 if (snd_BUG_ON(!card))
232 range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
233 range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
235 list_for_each_entry(dev, &card->devices, list) {
236 if (dev->type >= range_low && dev->type <= range_high) {
237 if ((err = snd_device_free(card, dev->device_data)) < 0)