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 | */ |
512bbd6a TI |
44 | int snd_device_new(struct snd_card *card, snd_device_type_t type, |
45 | void *device_data, struct snd_device_ops *ops) | |
1da177e4 | 46 | { |
512bbd6a | 47 | struct snd_device *dev; |
1da177e4 | 48 | |
7eaa943c TI |
49 | if (snd_BUG_ON(!card || !device_data || !ops)) |
50 | 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 | * | |
eb7c06e8 | 76 | * Return: Zero if successful, or a negative error code on failure or if the |
1da177e4 LT |
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 | 82 | |
7eaa943c TI |
83 | if (snd_BUG_ON(!card || !device_data)) |
84 | 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 | } | |
76a4d10e | 102 | snd_printd("device free %p (from %pF), not found\n", device_data, |
512bbd6a | 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 | * | |
eb7c06e8 | 119 | * Return: Zero if successful, or a negative error code on failure or if the |
1da177e4 LT |
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 | |
7eaa943c TI |
126 | if (snd_BUG_ON(!card || !device_data)) |
127 | 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 | } | |
76a4d10e | 139 | snd_printd("device disconnect %p (from %pF), not found\n", device_data, |
512bbd6a | 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 | * | |
eb7c06e8 | 154 | * Return: Zero if successful, or a negative error code on failure or if the |
1da177e4 LT |
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 | 161 | |
7eaa943c TI |
162 | if (snd_BUG_ON(!card || !device_data)) |
163 | 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 | ||
7eaa943c TI |
191 | if (snd_BUG_ON(!card)) |
192 | return -ENXIO; | |
9244b2c3 | 193 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
194 | 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 | */ | |
512bbd6a | 207 | int snd_device_disconnect_all(struct snd_card *card) |
1da177e4 | 208 | { |
512bbd6a | 209 | struct snd_device *dev; |
1da177e4 LT |
210 | int err = 0; |
211 | ||
7eaa943c TI |
212 | if (snd_BUG_ON(!card)) |
213 | return -ENXIO; | |
9244b2c3 | 214 | list_for_each_entry(dev, &card->devices, list) { |
1da177e4 LT |
215 | 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 | */ | |
512bbd6a | 225 | int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd) |
1da177e4 | 226 | { |
512bbd6a | 227 | struct snd_device *dev; |
1da177e4 | 228 | int err; |
fea952e5 | 229 | unsigned int range_low, range_high, type; |
1da177e4 | 230 | |
7eaa943c TI |
231 | if (snd_BUG_ON(!card)) |
232 | return -ENXIO; | |
fea952e5 | 233 | range_low = (__force unsigned int)cmd * SNDRV_DEV_TYPE_RANGE_SIZE; |
1da177e4 LT |
234 | range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1; |
235 | __again: | |
9244b2c3 | 236 | list_for_each_entry(dev, &card->devices, list) { |
fea952e5 CL |
237 | type = (__force unsigned int)dev->type; |
238 | if (type >= range_low && type <= range_high) { | |
1da177e4 LT |
239 | if ((err = snd_device_free(card, dev->device_data)) < 0) |
240 | return err; | |
241 | goto __again; | |
242 | } | |
243 | } | |
244 | return 0; | |
245 | } |