blob: 5858b02b0b1d4e753e4a1d9ee2bceedfaec02019 [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 */
Takashi Iwai512bbd62005-11-17 13:51:18 +010044int snd_device_new(struct snd_card *card, snd_device_type_t type,
45 void *device_data, struct snd_device_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
Takashi Iwai512bbd62005-11-17 13:51:18 +010047 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
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);
Takashi Iwai73e77ba2005-11-17 17:44:01 +010053 if (dev == NULL) {
54 snd_printk(KERN_ERR "Cannot allocate device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +010056 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 dev->card = card;
58 dev->type = type;
59 dev->state = SNDRV_DEV_BUILD;
60 dev->device_data = device_data;
61 dev->ops = ops;
62 list_add(&dev->list, &card->devices); /* add to the head of list */
63 return 0;
64}
65
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020066EXPORT_SYMBOL(snd_device_new);
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/**
69 * snd_device_free - release the device from the card
70 * @card: the card instance
71 * @device_data: the data pointer to release
72 *
73 * Removes the device from the list on the card and invokes the
Takashi Iwaic4614822006-06-23 14:38:23 +020074 * callbacks, dev_disconnect and dev_free, corresponding to the state.
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 * Then release the device.
76 *
77 * Returns zero if successful, or a negative error code on failure or if the
78 * device not found.
79 */
Takashi Iwai512bbd62005-11-17 13:51:18 +010080int snd_device_free(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
Takashi Iwai512bbd62005-11-17 13:51:18 +010082 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 snd_assert(card != NULL, return -ENXIO);
85 snd_assert(device_data != NULL, return -ENXIO);
Johannes Berg9244b2c2006-10-05 16:02:22 +020086 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 if (dev->device_data != device_data)
88 continue;
89 /* unlink */
90 list_del(&dev->list);
Takashi Iwaic4614822006-06-23 14:38:23 +020091 if (dev->state == SNDRV_DEV_REGISTERED &&
92 dev->ops->dev_disconnect)
93 if (dev->ops->dev_disconnect(dev))
94 snd_printk(KERN_ERR
95 "device disconnect failure\n");
96 if (dev->ops->dev_free) {
97 if (dev->ops->dev_free(dev))
98 snd_printk(KERN_ERR "device free failure\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 }
100 kfree(dev);
101 return 0;
102 }
Takashi Iwai512bbd62005-11-17 13:51:18 +0100103 snd_printd("device free %p (from %p), not found\n", device_data,
104 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return -ENXIO;
106}
107
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200108EXPORT_SYMBOL(snd_device_free);
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110/**
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200111 * snd_device_disconnect - disconnect the device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 * @card: the card instance
113 * @device_data: the data pointer to disconnect
114 *
115 * Turns the device into the disconnection state, invoking
116 * dev_disconnect callback, if the device was already registered.
117 *
118 * Usually called from snd_card_disconnect().
119 *
120 * Returns zero if successful, or a negative error code on failure or if the
121 * device not found.
122 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100123int snd_device_disconnect(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100125 struct snd_device *dev;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 snd_assert(card != NULL, return -ENXIO);
128 snd_assert(device_data != NULL, return -ENXIO);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200129 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 if (dev->device_data != device_data)
131 continue;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100132 if (dev->state == SNDRV_DEV_REGISTERED &&
133 dev->ops->dev_disconnect) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (dev->ops->dev_disconnect(dev))
135 snd_printk(KERN_ERR "device disconnect failure\n");
136 dev->state = SNDRV_DEV_DISCONNECTED;
137 }
138 return 0;
139 }
Takashi Iwai512bbd62005-11-17 13:51:18 +0100140 snd_printd("device disconnect %p (from %p), not found\n", device_data,
141 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return -ENXIO;
143}
144
145/**
146 * snd_device_register - register the device
147 * @card: the card instance
148 * @device_data: the data pointer to register
149 *
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().
154 *
155 * Returns zero if successful, or a negative error code on failure or if the
156 * device not found.
157 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100158int snd_device_register(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100160 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 int err;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200162
163 snd_assert(card != NULL, return -ENXIO);
164 snd_assert(device_data != NULL, return -ENXIO);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200165 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (dev->device_data != device_data)
167 continue;
168 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
169 if ((err = dev->ops->dev_register(dev)) < 0)
170 return err;
171 dev->state = SNDRV_DEV_REGISTERED;
172 return 0;
173 }
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100174 snd_printd("snd_device_register busy\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return -EBUSY;
176 }
177 snd_BUG();
178 return -ENXIO;
179}
180
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200181EXPORT_SYMBOL(snd_device_register);
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183/*
184 * register all the devices on the card.
185 * called from init.c
186 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100187int snd_device_register_all(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100189 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 int err;
191
192 snd_assert(card != NULL, return -ENXIO);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200193 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
195 if ((err = dev->ops->dev_register(dev)) < 0)
196 return err;
197 dev->state = SNDRV_DEV_REGISTERED;
198 }
199 }
200 return 0;
201}
202
203/*
204 * disconnect all the devices on the card.
205 * called from init.c
206 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100207int snd_device_disconnect_all(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100209 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 int err = 0;
211
212 snd_assert(card != NULL, return -ENXIO);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200213 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (snd_device_disconnect(card, dev->device_data) < 0)
215 err = -ENXIO;
216 }
217 return err;
218}
219
220/*
221 * release all the devices on the card.
222 * called from init.c
223 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100224int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100226 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 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:
Johannes Berg9244b2c2006-10-05 16:02:22 +0200234 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (dev->type >= range_low && dev->type <= range_high) {
236 if ((err = snd_device_free(card, dev->device_data)) < 0)
237 return err;
238 goto __again;
239 }
240 }
241 return 0;
242}