Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Device management routines | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include <linux/slab.h> |
23 | #include <linux/time.h> | |
d81a6d71 | 24 | #include <linux/export.h> |
1da177e4 LT |
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 | |
a3352f01 | 31 | * @type: the device type, SNDRV_DEV_XXX |
1da177e4 LT |
32 | * @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 | * | |
eb7c06e8 | 42 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 43 | */ |
9ce50543 | 44 | int snd_device_new(struct snd_card *card, enum snd_device_type type, |
512bbd6a | 45 | void *device_data, struct snd_device_ops *ops) |
1da177e4 | 46 | { |
512bbd6a | 47 | struct snd_device *dev; |
289ca025 | 48 | struct list_head *p; |
1da177e4 | 49 | |
7eaa943c TI |
50 | if (snd_BUG_ON(!card || !device_data || !ops)) |
51 | return -ENXIO; | |
ca2c0966 | 52 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
73e77ba0 | 53 | if (dev == NULL) { |
f2f9307a | 54 | dev_err(card->dev, "Cannot allocate device, type=%d\n", type); |
1da177e4 | 55 | return -ENOMEM; |
73e77ba0 | 56 | } |
289ca025 | 57 | INIT_LIST_HEAD(&dev->list); |
1da177e4 LT |
58 | dev->card = card; |
59 | dev->type = type; | |
60 | dev->state = SNDRV_DEV_BUILD; | |
61 | dev->device_data = device_data; | |
62 | dev->ops = ops; | |
289ca025 TI |
63 | |
64 | /* insert the entry in an incrementally sorted list */ | |
65 | list_for_each_prev(p, &card->devices) { | |
66 | struct snd_device *pdev = list_entry(p, struct snd_device, list); | |
67 | if ((unsigned int)pdev->type <= (unsigned int)type) | |
68 | break; | |
69 | } | |
70 | ||
71 | list_add(&dev->list, p); | |
1da177e4 LT |
72 | return 0; |
73 | } | |
c0d3fb39 TI |
74 | EXPORT_SYMBOL(snd_device_new); |
75 | ||
72620d60 TI |
76 | static int __snd_device_disconnect(struct snd_device *dev) |
77 | { | |
78 | if (dev->state == SNDRV_DEV_REGISTERED) { | |
79 | if (dev->ops->dev_disconnect && | |
80 | dev->ops->dev_disconnect(dev)) | |
81 | dev_err(dev->card->dev, "device disconnect failure\n"); | |
82 | dev->state = SNDRV_DEV_DISCONNECTED; | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
87 | static void __snd_device_free(struct snd_device *dev) | |
88 | { | |
89 | /* unlink */ | |
90 | list_del(&dev->list); | |
91 | ||
92 | __snd_device_disconnect(dev); | |
93 | if (dev->ops->dev_free) { | |
94 | if (dev->ops->dev_free(dev)) | |
95 | dev_err(dev->card->dev, "device free failure\n"); | |
96 | } | |
97 | kfree(dev); | |
98 | } | |
99 | ||
289ca025 TI |
100 | static struct snd_device *look_for_dev(struct snd_card *card, void *device_data) |
101 | { | |
102 | struct snd_device *dev; | |
103 | ||
104 | list_for_each_entry(dev, &card->devices, list) | |
105 | if (dev->device_data == device_data) | |
106 | return dev; | |
107 | ||
108 | return NULL; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | /** |
112 | * snd_device_free - release the device from the card | |
113 | * @card: the card instance | |
114 | * @device_data: the data pointer to release | |
115 | * | |
116 | * Removes the device from the list on the card and invokes the | |
c461482c | 117 | * callbacks, dev_disconnect and dev_free, corresponding to the state. |
1da177e4 | 118 | * Then release the device. |
1da177e4 | 119 | */ |
72620d60 | 120 | void snd_device_free(struct snd_card *card, void *device_data) |
1da177e4 | 121 | { |
512bbd6a | 122 | struct snd_device *dev; |
1da177e4 | 123 | |
7eaa943c | 124 | if (snd_BUG_ON(!card || !device_data)) |
72620d60 | 125 | return; |
289ca025 | 126 | dev = look_for_dev(card, device_data); |
72620d60 TI |
127 | if (dev) |
128 | __snd_device_free(dev); | |
129 | else | |
130 | dev_dbg(card->dev, "device free %p (from %pF), not found\n", | |
131 | device_data, __builtin_return_address(0)); | |
1da177e4 | 132 | } |
c0d3fb39 TI |
133 | EXPORT_SYMBOL(snd_device_free); |
134 | ||
72620d60 | 135 | static int __snd_device_register(struct snd_device *dev) |
1da177e4 | 136 | { |
72620d60 TI |
137 | if (dev->state == SNDRV_DEV_BUILD) { |
138 | if (dev->ops->dev_register) { | |
139 | int err = dev->ops->dev_register(dev); | |
140 | if (err < 0) | |
141 | return err; | |
1da177e4 | 142 | } |
72620d60 | 143 | dev->state = SNDRV_DEV_REGISTERED; |
1da177e4 | 144 | } |
72620d60 | 145 | return 0; |
1da177e4 LT |
146 | } |
147 | ||
148 | /** | |
149 | * snd_device_register - register the device | |
150 | * @card: the card instance | |
151 | * @device_data: the data pointer to register | |
152 | * | |
153 | * Registers the device which was already created via | |
154 | * snd_device_new(). Usually this is called from snd_card_register(), | |
155 | * but it can be called later if any new devices are created after | |
156 | * invocation of snd_card_register(). | |
157 | * | |
eb7c06e8 | 158 | * Return: Zero if successful, or a negative error code on failure or if the |
1da177e4 LT |
159 | * device not found. |
160 | */ | |
512bbd6a | 161 | int snd_device_register(struct snd_card *card, void *device_data) |
1da177e4 | 162 | { |
512bbd6a | 163 | struct snd_device *dev; |
a3352f01 | 164 | |
7eaa943c TI |
165 | if (snd_BUG_ON(!card || !device_data)) |
166 | return -ENXIO; | |
289ca025 | 167 | dev = look_for_dev(card, device_data); |
72620d60 TI |
168 | if (dev) |
169 | return __snd_device_register(dev); | |
1da177e4 LT |
170 | snd_BUG(); |
171 | return -ENXIO; | |
172 | } | |
c0d3fb39 TI |
173 | EXPORT_SYMBOL(snd_device_register); |
174 | ||
1da177e4 LT |
175 | /* |
176 | * register all the devices on the card. | |
177 | * called from init.c | |
178 | */ | |
512bbd6a | 179 | int snd_device_register_all(struct snd_card *card) |
1da177e4 | 180 | { |
512bbd6a | 181 | struct snd_device *dev; |
1da177e4 LT |
182 | int err; |
183 | ||
7eaa943c TI |
184 | if (snd_BUG_ON(!card)) |
185 | return -ENXIO; | |
9244b2c3 | 186 | list_for_each_entry(dev, &card->devices, list) { |
72620d60 TI |
187 | err = __snd_device_register(dev); |
188 | if (err < 0) | |
189 | return err; | |
1da177e4 LT |
190 | } |
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
195 | * disconnect all the devices on the card. | |
196 | * called from init.c | |
197 | */ | |
512bbd6a | 198 | int snd_device_disconnect_all(struct snd_card *card) |
1da177e4 | 199 | { |
512bbd6a | 200 | struct snd_device *dev; |
1da177e4 LT |
201 | int err = 0; |
202 | ||
7eaa943c TI |
203 | if (snd_BUG_ON(!card)) |
204 | return -ENXIO; | |
289ca025 | 205 | list_for_each_entry_reverse(dev, &card->devices, list) { |
72620d60 | 206 | if (__snd_device_disconnect(dev) < 0) |
1da177e4 LT |
207 | err = -ENXIO; |
208 | } | |
209 | return err; | |
210 | } | |
211 | ||
212 | /* | |
213 | * release all the devices on the card. | |
214 | * called from init.c | |
215 | */ | |
72620d60 | 216 | void snd_device_free_all(struct snd_card *card) |
1da177e4 | 217 | { |
289ca025 | 218 | struct snd_device *dev, *next; |
1da177e4 | 219 | |
7eaa943c | 220 | if (snd_BUG_ON(!card)) |
72620d60 TI |
221 | return; |
222 | list_for_each_entry_safe_reverse(dev, next, &card->devices, list) | |
223 | __snd_device_free(dev); | |
1da177e4 | 224 | } |