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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>
Paul Gortmakerd81a6d72011-09-22 09:34:58 -040024#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +010042 * Return: Zero if successful, or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 */
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
Takashi Iwai7eaa9432008-08-08 17:09:09 +020049 if (snd_BUG_ON(!card || !device_data || !ops))
50 return -ENXIO;
Takashi Iwaica2c0962005-09-09 14:20:23 +020051 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +010052 if (dev == NULL) {
53 snd_printk(KERN_ERR "Cannot allocate device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +010055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 dev->card = card;
57 dev->type = type;
58 dev->state = SNDRV_DEV_BUILD;
59 dev->device_data = device_data;
60 dev->ops = ops;
61 list_add(&dev->list, &card->devices); /* add to the head of list */
62 return 0;
63}
64
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020065EXPORT_SYMBOL(snd_device_new);
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067/**
68 * snd_device_free - release the device from the card
69 * @card: the card instance
70 * @device_data: the data pointer to release
71 *
72 * Removes the device from the list on the card and invokes the
Takashi Iwaic4614822006-06-23 14:38:23 +020073 * callbacks, dev_disconnect and dev_free, corresponding to the state.
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 * Then release the device.
75 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +010076 * Return: Zero if successful, or a negative error code on failure or if the
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 * device not found.
78 */
Takashi Iwai512bbd62005-11-17 13:51:18 +010079int snd_device_free(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
Takashi Iwai512bbd62005-11-17 13:51:18 +010081 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Takashi Iwai7eaa9432008-08-08 17:09:09 +020083 if (snd_BUG_ON(!card || !device_data))
84 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +020085 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 if (dev->device_data != device_data)
87 continue;
88 /* unlink */
89 list_del(&dev->list);
Takashi Iwaic4614822006-06-23 14:38:23 +020090 if (dev->state == SNDRV_DEV_REGISTERED &&
91 dev->ops->dev_disconnect)
92 if (dev->ops->dev_disconnect(dev))
93 snd_printk(KERN_ERR
94 "device disconnect failure\n");
95 if (dev->ops->dev_free) {
96 if (dev->ops->dev_free(dev))
97 snd_printk(KERN_ERR "device free failure\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 }
99 kfree(dev);
100 return 0;
101 }
Takashi Iwai76a4d102008-10-16 16:17:30 +0200102 snd_printd("device free %p (from %pF), not found\n", device_data,
Takashi Iwai512bbd62005-11-17 13:51:18 +0100103 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return -ENXIO;
105}
106
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200107EXPORT_SYMBOL(snd_device_free);
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109/**
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200110 * snd_device_disconnect - disconnect the device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 * @card: the card instance
112 * @device_data: the data pointer to disconnect
113 *
114 * Turns the device into the disconnection state, invoking
115 * dev_disconnect callback, if the device was already registered.
116 *
117 * Usually called from snd_card_disconnect().
118 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100119 * Return: Zero if successful, or a negative error code on failure or if the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 * device not found.
121 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100122int snd_device_disconnect(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100124 struct snd_device *dev;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200125
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200126 if (snd_BUG_ON(!card || !device_data))
127 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200128 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 if (dev->device_data != device_data)
130 continue;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100131 if (dev->state == SNDRV_DEV_REGISTERED &&
132 dev->ops->dev_disconnect) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (dev->ops->dev_disconnect(dev))
134 snd_printk(KERN_ERR "device disconnect failure\n");
135 dev->state = SNDRV_DEV_DISCONNECTED;
136 }
137 return 0;
138 }
Takashi Iwai76a4d102008-10-16 16:17:30 +0200139 snd_printd("device disconnect %p (from %pF), not found\n", device_data,
Takashi Iwai512bbd62005-11-17 13:51:18 +0100140 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 return -ENXIO;
142}
143
144/**
145 * snd_device_register - register the device
146 * @card: the card instance
147 * @device_data: the data pointer to register
148 *
149 * Registers the device which was already created via
150 * snd_device_new(). Usually this is called from snd_card_register(),
151 * but it can be called later if any new devices are created after
152 * invocation of snd_card_register().
153 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100154 * Return: Zero if successful, or a negative error code on failure or if the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 * device not found.
156 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100157int snd_device_register(struct snd_card *card, void *device_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100159 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 int err;
Henrik Kretzschmara3352f02005-06-29 19:30:42 +0200161
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200162 if (snd_BUG_ON(!card || !device_data))
163 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200164 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (dev->device_data != device_data)
166 continue;
167 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
168 if ((err = dev->ops->dev_register(dev)) < 0)
169 return err;
170 dev->state = SNDRV_DEV_REGISTERED;
171 return 0;
172 }
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100173 snd_printd("snd_device_register busy\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 return -EBUSY;
175 }
176 snd_BUG();
177 return -ENXIO;
178}
179
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200180EXPORT_SYMBOL(snd_device_register);
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182/*
183 * register all the devices on the card.
184 * called from init.c
185 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100186int snd_device_register_all(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100188 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 int err;
190
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200191 if (snd_BUG_ON(!card))
192 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
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200212 if (snd_BUG_ON(!card))
213 return -ENXIO;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200214 list_for_each_entry(dev, &card->devices, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 if (snd_device_disconnect(card, dev->device_data) < 0)
216 err = -ENXIO;
217 }
218 return err;
219}
220
221/*
222 * release all the devices on the card.
223 * called from init.c
224 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100225int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100227 struct snd_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 int err;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100229 unsigned int range_low, range_high, type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200231 if (snd_BUG_ON(!card))
232 return -ENXIO;
Clemens Ladischfea952e2011-02-14 11:00:47 +0100233 range_low = (__force unsigned int)cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
235 __again:
Johannes Berg9244b2c2006-10-05 16:02:22 +0200236 list_for_each_entry(dev, &card->devices, list) {
Clemens Ladischfea952e2011-02-14 11:00:47 +0100237 type = (__force unsigned int)dev->type;
238 if (type >= range_low && type <= range_high) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if ((err = snd_device_free(card, dev->device_data)) < 0)
240 return err;
241 goto __again;
242 }
243 }
244 return 0;
245}