blob: 1f509f56e60c82108007dc6baa01b72fb1f91027 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Device management routines
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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
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>
27
28/**
29 * snd_device_new - create an ALSA device component
30 * @card: the card instance
Henrik Kretzschmara3352f02005-06-29 19:30:42 +020031 * @type: the device type, SNDRV_DEV_XXX
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 * @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 *
42 * Returns zero if successful, or a negative error code on failure.
43 */
44int snd_device_new(snd_card_t *card, snd_device_type_t type,
45 void *device_data, snd_device_ops_t *ops)
46{
47 snd_device_t *dev;
48
Henrik Kretzschmara3352f02005-06-29 19:30:42 +020049 snd_assert(card != NULL, return -ENXIO);
50 snd_assert(device_data != NULL, return -ENXIO);
51 snd_assert(ops != NULL, return -ENXIO);
Takashi Iwaica2c0962005-09-09 14:20:23 +020052 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 if (dev == NULL)
54 return -ENOMEM;
55 dev->card = card;
56 dev->type = type;
57 dev->state = SNDRV_DEV_BUILD;
58 dev->device_data = device_data;
59 dev->ops = ops;
60 list_add(&dev->list, &card->devices); /* add to the head of list */
61 return 0;
62}
63
64/**
65 * snd_device_free - release the device from the card
66 * @card: the card instance
67 * @device_data: the data pointer to release
68 *
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.
72 *
73 * Returns zero if successful, or a negative error code on failure or if the
74 * device not found.
75 */
76int snd_device_free(snd_card_t *card, void *device_data)
77{
78 struct list_head *list;
79 snd_device_t *dev;
80
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)
86 continue;
87 /* unlink */
88 list_del(&dev->list);
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");
93 } else {
94 if (dev->ops->dev_free) {
95 if (dev->ops->dev_free(dev))
96 snd_printk(KERN_ERR "device free failure\n");
97 }
98 }
99 kfree(dev);
100 return 0;
101 }
102 snd_printd("device free %p (from %p), not found\n", device_data, __builtin_return_address(0));
103 return -ENXIO;
104}
105
106/**
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200107 * snd_device_disconnect - disconnect the device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 * @card: the card instance
109 * @device_data: the data pointer to disconnect
110 *
111 * Turns the device into the disconnection state, invoking
112 * dev_disconnect callback, if the device was already registered.
113 *
114 * Usually called from snd_card_disconnect().
115 *
116 * Returns zero if successful, or a negative error code on failure or if the
117 * device not found.
118 */
119int snd_device_disconnect(snd_card_t *card, void *device_data)
120{
121 struct list_head *list;
122 snd_device_t *dev;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 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)
129 continue;
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;
134 }
135 return 0;
136 }
137 snd_printd("device disconnect %p (from %p), not found\n", device_data, __builtin_return_address(0));
138 return -ENXIO;
139}
140
141/**
142 * snd_device_register - register the device
143 * @card: the card instance
144 * @device_data: the data pointer to register
145 *
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().
150 *
151 * Returns zero if successful, or a negative error code on failure or if the
152 * device not found.
153 */
154int snd_device_register(snd_card_t *card, void *device_data)
155{
156 struct list_head *list;
157 snd_device_t *dev;
158 int err;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200159
160 snd_assert(card != NULL, return -ENXIO);
161 snd_assert(device_data != NULL, return -ENXIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 list_for_each(list, &card->devices) {
163 dev = snd_device(list);
164 if (dev->device_data != device_data)
165 continue;
166 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
167 if ((err = dev->ops->dev_register(dev)) < 0)
168 return err;
169 dev->state = SNDRV_DEV_REGISTERED;
170 return 0;
171 }
172 return -EBUSY;
173 }
174 snd_BUG();
175 return -ENXIO;
176}
177
178/*
179 * register all the devices on the card.
180 * called from init.c
181 */
182int snd_device_register_all(snd_card_t *card)
183{
184 struct list_head *list;
185 snd_device_t *dev;
186 int err;
187
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)
193 return err;
194 dev->state = SNDRV_DEV_REGISTERED;
195 }
196 }
197 return 0;
198}
199
200/*
201 * disconnect all the devices on the card.
202 * called from init.c
203 */
204int snd_device_disconnect_all(snd_card_t *card)
205{
206 snd_device_t *dev;
207 struct list_head *list;
208 int err = 0;
209
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)
214 err = -ENXIO;
215 }
216 return err;
217}
218
219/*
220 * release all the devices on the card.
221 * called from init.c
222 */
223int snd_device_free_all(snd_card_t *card, snd_device_cmd_t cmd)
224{
225 snd_device_t *dev;
226 struct list_head *list;
227 int err;
228 unsigned int range_low, range_high;
229
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;
233 __again:
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)
238 return err;
239 goto __again;
240 }
241 }
242 return 0;
243}