2 * Device management routines
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/errno.h>
26 #include <sound/core.h>
29 * snd_device_new - create an ALSA device component
30 * @card: the card instance
31 * @type: the device type, SNDRV_DEV_XXX
32 * @device_data: the data pointer of this device
33 * @ops: the operator table
35 * Creates a new device component for the given data pointer.
36 * The device will be assigned to the card and managed together
39 * The data pointer plays a role as the identifier, too, so the
40 * pointer address must be unique and unchanged.
42 * Returns zero if successful, or a negative error code on failure.
44 int snd_device_new(snd_card_t *card, snd_device_type_t type,
45 void *device_data, snd_device_ops_t *ops)
49 snd_assert(card != NULL, return -ENXIO);
50 snd_assert(device_data != NULL, return -ENXIO);
51 snd_assert(ops != NULL, return -ENXIO);
52 dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);
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 */
65 * snd_device_free - release the device from the card
66 * @card: the card instance
67 * @device_data: the data pointer to release
69 * Removes the device from the list on the card and invokes the
70 * callback, dev_unregister or dev_free, corresponding to the state.
71 * Then release the device.
73 * Returns zero if successful, or a negative error code on failure or if the
76 int snd_device_free(snd_card_t *card, void *device_data)
78 struct list_head *list;
81 snd_assert(card != NULL, return -ENXIO);
82 snd_assert(device_data != NULL, return -ENXIO);
83 list_for_each(list, &card->devices) {
84 dev = snd_device(list);
85 if (dev->device_data != device_data)
89 if ((dev->state == SNDRV_DEV_REGISTERED || dev->state == SNDRV_DEV_DISCONNECTED) &&
90 dev->ops->dev_unregister) {
91 if (dev->ops->dev_unregister(dev))
92 snd_printk(KERN_ERR "device unregister failure\n");
94 if (dev->ops->dev_free) {
95 if (dev->ops->dev_free(dev))
96 snd_printk(KERN_ERR "device free failure\n");
102 snd_printd("device free %p (from %p), not found\n", device_data, __builtin_return_address(0));
107 * snd_device_disconnect - disconnect the device
108 * @card: the card instance
109 * @device_data: the data pointer to disconnect
111 * Turns the device into the disconnection state, invoking
112 * dev_disconnect callback, if the device was already registered.
114 * Usually called from snd_card_disconnect().
116 * Returns zero if successful, or a negative error code on failure or if the
119 int snd_device_disconnect(snd_card_t *card, void *device_data)
121 struct list_head *list;
124 snd_assert(card != NULL, return -ENXIO);
125 snd_assert(device_data != NULL, return -ENXIO);
126 list_for_each(list, &card->devices) {
127 dev = snd_device(list);
128 if (dev->device_data != device_data)
130 if (dev->state == SNDRV_DEV_REGISTERED && dev->ops->dev_disconnect) {
131 if (dev->ops->dev_disconnect(dev))
132 snd_printk(KERN_ERR "device disconnect failure\n");
133 dev->state = SNDRV_DEV_DISCONNECTED;
137 snd_printd("device disconnect %p (from %p), not found\n", device_data, __builtin_return_address(0));
142 * snd_device_register - register the device
143 * @card: the card instance
144 * @device_data: the data pointer to register
146 * Registers the device which was already created via
147 * snd_device_new(). Usually this is called from snd_card_register(),
148 * but it can be called later if any new devices are created after
149 * invocation of snd_card_register().
151 * Returns zero if successful, or a negative error code on failure or if the
154 int snd_device_register(snd_card_t *card, void *device_data)
156 struct list_head *list;
160 snd_assert(card != NULL, return -ENXIO);
161 snd_assert(device_data != NULL, return -ENXIO);
162 list_for_each(list, &card->devices) {
163 dev = snd_device(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;
179 * register all the devices on the card.
182 int snd_device_register_all(snd_card_t *card)
184 struct list_head *list;
188 snd_assert(card != NULL, return -ENXIO);
189 list_for_each(list, &card->devices) {
190 dev = snd_device(list);
191 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
192 if ((err = dev->ops->dev_register(dev)) < 0)
194 dev->state = SNDRV_DEV_REGISTERED;
201 * disconnect all the devices on the card.
204 int snd_device_disconnect_all(snd_card_t *card)
207 struct list_head *list;
210 snd_assert(card != NULL, return -ENXIO);
211 list_for_each(list, &card->devices) {
212 dev = snd_device(list);
213 if (snd_device_disconnect(card, dev->device_data) < 0)
220 * release all the devices on the card.
223 int snd_device_free_all(snd_card_t *card, snd_device_cmd_t cmd)
226 struct list_head *list;
228 unsigned int range_low, range_high;
230 snd_assert(card != NULL, return -ENXIO);
231 range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
232 range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
234 list_for_each(list, &card->devices) {
235 dev = snd_device(list);
236 if (dev->type >= range_low && dev->type <= range_high) {
237 if ((err = snd_device_free(card, dev->device_data)) < 0)