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/export.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 * Return: Zero if successful, or a negative error code on failure.
44 int snd_device_new(struct snd_card *card, enum snd_device_type type,
45 void *device_data, struct snd_device_ops *ops)
47 struct snd_device *dev;
49 if (snd_BUG_ON(!card || !device_data || !ops))
51 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
53 dev_err(card->dev, "Cannot allocate device, type=%d\n", type);
58 dev->state = SNDRV_DEV_BUILD;
59 dev->device_data = device_data;
61 list_add(&dev->list, &card->devices); /* add to the head of list */
65 EXPORT_SYMBOL(snd_device_new);
68 * snd_device_free - release the device from the card
69 * @card: the card instance
70 * @device_data: the data pointer to release
72 * Removes the device from the list on the card and invokes the
73 * callbacks, dev_disconnect and dev_free, corresponding to the state.
74 * Then release the device.
76 * Return: Zero if successful, or a negative error code on failure or if the
79 int snd_device_free(struct snd_card *card, void *device_data)
81 struct snd_device *dev;
83 if (snd_BUG_ON(!card || !device_data))
85 list_for_each_entry(dev, &card->devices, list) {
86 if (dev->device_data != device_data)
90 if (dev->state == SNDRV_DEV_REGISTERED &&
91 dev->ops->dev_disconnect)
92 if (dev->ops->dev_disconnect(dev))
94 "device disconnect failure\n");
95 if (dev->ops->dev_free) {
96 if (dev->ops->dev_free(dev))
97 dev_err(card->dev, "device free failure\n");
102 dev_dbg(card->dev, "device free %p (from %pF), not found\n",
103 device_data, __builtin_return_address(0));
107 EXPORT_SYMBOL(snd_device_free);
110 * snd_device_disconnect - disconnect the device
111 * @card: the card instance
112 * @device_data: the data pointer to disconnect
114 * Turns the device into the disconnection state, invoking
115 * dev_disconnect callback, if the device was already registered.
117 * Usually called from snd_card_disconnect().
119 * Return: Zero if successful, or a negative error code on failure or if the
122 int snd_device_disconnect(struct snd_card *card, void *device_data)
124 struct snd_device *dev;
126 if (snd_BUG_ON(!card || !device_data))
128 list_for_each_entry(dev, &card->devices, list) {
129 if (dev->device_data != device_data)
131 if (dev->state == SNDRV_DEV_REGISTERED &&
132 dev->ops->dev_disconnect) {
133 if (dev->ops->dev_disconnect(dev))
135 "device disconnect failure\n");
136 dev->state = SNDRV_DEV_DISCONNECTED;
140 dev_dbg(card->dev, "device disconnect %p (from %pF), not found\n",
141 device_data, __builtin_return_address(0));
146 * snd_device_register - register the device
147 * @card: the card instance
148 * @device_data: the data pointer to register
150 * Registers the device which was already created via
151 * snd_device_new(). Usually this is called from snd_card_register(),
152 * but it can be called later if any new devices are created after
153 * invocation of snd_card_register().
155 * Return: Zero if successful, or a negative error code on failure or if the
158 int snd_device_register(struct snd_card *card, void *device_data)
160 struct snd_device *dev;
163 if (snd_BUG_ON(!card || !device_data))
165 list_for_each_entry(dev, &card->devices, list) {
166 if (dev->device_data != device_data)
168 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
169 if ((err = dev->ops->dev_register(dev)) < 0)
171 dev->state = SNDRV_DEV_REGISTERED;
174 dev_dbg(card->dev, "snd_device_register busy\n");
181 EXPORT_SYMBOL(snd_device_register);
184 * register all the devices on the card.
187 int snd_device_register_all(struct snd_card *card)
189 struct snd_device *dev;
192 if (snd_BUG_ON(!card))
194 list_for_each_entry(dev, &card->devices, list) {
195 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
196 if ((err = dev->ops->dev_register(dev)) < 0)
198 dev->state = SNDRV_DEV_REGISTERED;
205 * disconnect all the devices on the card.
208 int snd_device_disconnect_all(struct snd_card *card)
210 struct snd_device *dev;
213 if (snd_BUG_ON(!card))
215 list_for_each_entry(dev, &card->devices, list) {
216 if (snd_device_disconnect(card, dev->device_data) < 0)
223 * release all the devices on the card.
226 int snd_device_free_all(struct snd_card *card, enum snd_device_cmd cmd)
228 struct snd_device *dev;
230 unsigned int range_low, range_high, type;
232 if (snd_BUG_ON(!card))
234 range_low = (unsigned int)cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
235 range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
237 list_for_each_entry(dev, &card->devices, list) {
238 type = (unsigned int)dev->type;
239 if (type >= range_low && type <= range_high) {
240 if ((err = snd_device_free(card, dev->device_data)) < 0)