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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> | |
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 | |
a3352f01 | 30 | * @type: the device type, SNDRV_DEV_XXX |
1da177e4 LT |
31 | * @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 | */ | |
512bbd6a TI |
43 | int snd_device_new(struct snd_card *card, snd_device_type_t type, |
44 | void *device_data, struct snd_device_ops *ops) | |
1da177e4 | 45 | { |
512bbd6a | 46 | struct snd_device *dev; |
1da177e4 | 47 | |
a3352f01 HK |
48 | snd_assert(card != NULL, return -ENXIO); |
49 | snd_assert(device_data != NULL, return -ENXIO); | |
50 | snd_assert(ops != NULL, return -ENXIO); | |
ca2c0966 | 51 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
73e77ba0 TI |
52 | if (dev == NULL) { |
53 | snd_printk(KERN_ERR "Cannot allocate device\n"); | |
1da177e4 | 54 | return -ENOMEM; |
73e77ba0 | 55 | } |
1da177e4 LT |
56 | 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 | ||
c0d3fb39 TI |
65 | EXPORT_SYMBOL(snd_device_new); |
66 | ||
1da177e4 LT |
67 | /** |
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 | |
c461482c | 73 | * callbacks, dev_disconnect and dev_free, corresponding to the state. |
1da177e4 LT |
74 | * Then release the device. |
75 | * | |
76 | * Returns zero if successful, or a negative error code on failure or if the | |
77 | * device not found. | |
78 | */ | |
512bbd6a | 79 | int snd_device_free(struct snd_card *card, void *device_data) |
1da177e4 | 80 | { |
512bbd6a | 81 | struct snd_device *dev; |
1da177e4 LT |
82 | |
83 | snd_assert(card != NULL, return -ENXIO); | |
84 | snd_assert(device_data != NULL, return -ENXIO); | |
9244b2c3 | 85 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
86 | if (dev->device_data != device_data) |
87 | continue; | |
88 | /* unlink */ | |
89 | list_del(&dev->list); | |
c461482c TI |
90 | 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"); | |
1da177e4 LT |
98 | } |
99 | kfree(dev); | |
100 | return 0; | |
101 | } | |
512bbd6a TI |
102 | snd_printd("device free %p (from %p), not found\n", device_data, |
103 | __builtin_return_address(0)); | |
1da177e4 LT |
104 | return -ENXIO; |
105 | } | |
106 | ||
c0d3fb39 TI |
107 | EXPORT_SYMBOL(snd_device_free); |
108 | ||
1da177e4 | 109 | /** |
a3352f01 | 110 | * snd_device_disconnect - disconnect the device |
1da177e4 LT |
111 | * @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 | * | |
119 | * Returns zero if successful, or a negative error code on failure or if the | |
120 | * device not found. | |
121 | */ | |
512bbd6a | 122 | int snd_device_disconnect(struct snd_card *card, void *device_data) |
1da177e4 | 123 | { |
512bbd6a | 124 | struct snd_device *dev; |
a3352f01 | 125 | |
1da177e4 LT |
126 | snd_assert(card != NULL, return -ENXIO); |
127 | snd_assert(device_data != NULL, return -ENXIO); | |
9244b2c3 | 128 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
129 | if (dev->device_data != device_data) |
130 | continue; | |
512bbd6a TI |
131 | if (dev->state == SNDRV_DEV_REGISTERED && |
132 | dev->ops->dev_disconnect) { | |
1da177e4 LT |
133 | 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 | } | |
512bbd6a TI |
139 | snd_printd("device disconnect %p (from %p), not found\n", device_data, |
140 | __builtin_return_address(0)); | |
1da177e4 LT |
141 | 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 | * | |
154 | * Returns zero if successful, or a negative error code on failure or if the | |
155 | * device not found. | |
156 | */ | |
512bbd6a | 157 | int snd_device_register(struct snd_card *card, void *device_data) |
1da177e4 | 158 | { |
512bbd6a | 159 | struct snd_device *dev; |
1da177e4 | 160 | int err; |
a3352f01 HK |
161 | |
162 | snd_assert(card != NULL, return -ENXIO); | |
163 | snd_assert(device_data != NULL, return -ENXIO); | |
9244b2c3 | 164 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
165 | 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 | } | |
73e77ba0 | 173 | snd_printd("snd_device_register busy\n"); |
1da177e4 LT |
174 | return -EBUSY; |
175 | } | |
176 | snd_BUG(); | |
177 | return -ENXIO; | |
178 | } | |
179 | ||
c0d3fb39 TI |
180 | EXPORT_SYMBOL(snd_device_register); |
181 | ||
1da177e4 LT |
182 | /* |
183 | * register all the devices on the card. | |
184 | * called from init.c | |
185 | */ | |
512bbd6a | 186 | int snd_device_register_all(struct snd_card *card) |
1da177e4 | 187 | { |
512bbd6a | 188 | struct snd_device *dev; |
1da177e4 LT |
189 | int err; |
190 | ||
191 | snd_assert(card != NULL, return -ENXIO); | |
9244b2c3 | 192 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
193 | 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 | */ | |
512bbd6a | 206 | int snd_device_disconnect_all(struct snd_card *card) |
1da177e4 | 207 | { |
512bbd6a | 208 | struct snd_device *dev; |
1da177e4 LT |
209 | int err = 0; |
210 | ||
211 | snd_assert(card != NULL, return -ENXIO); | |
9244b2c3 | 212 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
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 | */ | |
512bbd6a | 223 | int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd) |
1da177e4 | 224 | { |
512bbd6a | 225 | struct snd_device *dev; |
1da177e4 LT |
226 | int err; |
227 | unsigned int range_low, range_high; | |
228 | ||
229 | snd_assert(card != NULL, return -ENXIO); | |
230 | range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE; | |
231 | range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1; | |
232 | __again: | |
9244b2c3 | 233 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
234 | if (dev->type >= range_low && dev->type <= range_high) { |
235 | if ((err = snd_device_free(card, dev->device_data)) < 0) | |
236 | return err; | |
237 | goto __again; | |
238 | } | |
239 | } | |
240 | return 0; | |
241 | } |