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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Device management routines
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/slab.h>
23#include <linux/time.h>
24#include <linux/errno.h>
25#include <sound/core.h>
26
27/**
28 * snd_device_new - create an ALSA device component
29 * @card: the card instance
Henrik Kretzschmara3352f02005-06-29 19:30:42 +020030 * @type: the device type, SNDRV_DEV_XXX
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 * @device_data: the data pointer of this device
32 * @ops: the operator table
33 *
34 * Creates a new device component for the given data pointer.
35 * The device will be assigned to the card and managed together
36 * by the card.
37 *
38 * The data pointer plays a role as the identifier, too, so the
39 * pointer address must be unique and unchanged.
40 *
41 * Returns zero if successful, or a negative error code on failure.
42 */
Takashi Iwai512bbd62005-11-17 13:51:18 +010043int snd_device_new(struct snd_card *card, snd_device_type_t type,
44 void *device_data, struct snd_device_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
Takashi Iwai512bbd62005-11-17 13:51:18 +010046 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Takashi Iwai7eaa9432008-08-08 17:09:09 +020048 if (snd_BUG_ON(!card || !device_data || !ops))
49 return -ENXIO;
Takashi Iwaica2c0962005-09-09 14:20:23 +020050 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +010051 if (dev == NULL) {
52 snd_printk(KERN_ERR "Cannot allocate device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +010054 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 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
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020064EXPORT_SYMBOL(snd_device_new);
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/**
67 * snd_device_free - release the device from the card
68 * @card: the card instance
69 * @device_data: the data pointer to release
70 *
71 * Removes the device from the list on the card and invokes the
Takashi Iwaic4614822006-06-23 14:38:23 +020072 * callbacks, dev_disconnect and dev_free, corresponding to the state.
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 * Then release the device.
74 *
75 * Returns zero if successful, or a negative error code on failure or if the
76 * device not found.
77 */
Takashi Iwai512bbd62005-11-17 13:51:18 +010078int snd_device_free(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
Takashi Iwai512bbd62005-11-17 13:51:18 +010080 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Takashi Iwai7eaa9432008-08-08 17:09:09 +020082 if (snd_BUG_ON(!card || !device_data))
83 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +020084 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (dev->device_data != device_data)
86 continue;
87 /* unlink */
88 list_del(&dev->list);
Takashi Iwaic4614822006-06-23 14:38:23 +020089 if (dev->state == SNDRV_DEV_REGISTERED &&
90 dev->ops->dev_disconnect)
91 if (dev->ops->dev_disconnect(dev))
92 snd_printk(KERN_ERR
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");
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
98 kfree(dev);
99 return 0;
100 }
Takashi Iwai512bbd62005-11-17 13:51:18 +0100101 snd_printd("device free %p (from %p), not found\n", device_data,
102 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return -ENXIO;
104}
105
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200106EXPORT_SYMBOL(snd_device_free);
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108/**
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200109 * snd_device_disconnect - disconnect the device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 * @card: the card instance
111 * @device_data: the data pointer to disconnect
112 *
113 * Turns the device into the disconnection state, invoking
114 * dev_disconnect callback, if the device was already registered.
115 *
116 * Usually called from snd_card_disconnect().
117 *
118 * Returns zero if successful, or a negative error code on failure or if the
119 * device not found.
120 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100121int snd_device_disconnect(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100123 struct snd_device *dev;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200124
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200125 if (snd_BUG_ON(!card || !device_data))
126 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200127 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (dev->device_data != device_data)
129 continue;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100130 if (dev->state == SNDRV_DEV_REGISTERED &&
131 dev->ops->dev_disconnect) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 if (dev->ops->dev_disconnect(dev))
133 snd_printk(KERN_ERR "device disconnect failure\n");
134 dev->state = SNDRV_DEV_DISCONNECTED;
135 }
136 return 0;
137 }
Takashi Iwai512bbd62005-11-17 13:51:18 +0100138 snd_printd("device disconnect %p (from %p), not found\n", device_data,
139 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 return -ENXIO;
141}
142
143/**
144 * snd_device_register - register the device
145 * @card: the card instance
146 * @device_data: the data pointer to register
147 *
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().
152 *
153 * Returns zero if successful, or a negative error code on failure or if the
154 * device not found.
155 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100156int snd_device_register(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100158 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 int err;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200160
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200161 if (snd_BUG_ON(!card || !device_data))
162 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200163 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 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 }
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100172 snd_printd("snd_device_register busy\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return -EBUSY;
174 }
175 snd_BUG();
176 return -ENXIO;
177}
178
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200179EXPORT_SYMBOL(snd_device_register);
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/*
182 * register all the devices on the card.
183 * called from init.c
184 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100185int snd_device_register_all(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100187 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 int err;
189
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200190 if (snd_BUG_ON(!card))
191 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200192 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
194 if ((err = dev->ops->dev_register(dev)) < 0)
195 return err;
196 dev->state = SNDRV_DEV_REGISTERED;
197 }
198 }
199 return 0;
200}
201
202/*
203 * disconnect all the devices on the card.
204 * called from init.c
205 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100206int snd_device_disconnect_all(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100208 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 int err = 0;
210
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200211 if (snd_BUG_ON(!card))
212 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
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200230 if (snd_BUG_ON(!card))
231 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
233 range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
234 __again:
Johannes Berg9244b2c2006-10-05 16:02:22 +0200235 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 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}