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1da177e4 LT |
1 | /* |
2 | * Device management routines | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
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 | ||
22 | #include <sound/driver.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/time.h> | |
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 | * | |
42 | * Returns zero if successful, or a negative error code on failure. | |
43 | */ | |
44 | int snd_device_new(snd_card_t *card, snd_device_type_t type, | |
45 | void *device_data, snd_device_ops_t *ops) | |
46 | { | |
47 | snd_device_t *dev; | |
48 | ||
a3352f01 HK |
49 | snd_assert(card != NULL, return -ENXIO); |
50 | snd_assert(device_data != NULL, return -ENXIO); | |
51 | snd_assert(ops != NULL, return -ENXIO); | |
1da177e4 LT |
52 | dev = kcalloc(1, sizeof(*dev), GFP_KERNEL); |
53 | if (dev == NULL) | |
54 | return -ENOMEM; | |
55 | 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 | ||
64 | /** | |
65 | * snd_device_free - release the device from the card | |
66 | * @card: the card instance | |
67 | * @device_data: the data pointer to release | |
68 | * | |
69 | * Removes the device from the list on the card and invokes the | |
70 | * callback, dev_unregister or dev_free, corresponding to the state. | |
71 | * Then release the device. | |
72 | * | |
73 | * Returns zero if successful, or a negative error code on failure or if the | |
74 | * device not found. | |
75 | */ | |
76 | int snd_device_free(snd_card_t *card, void *device_data) | |
77 | { | |
78 | struct list_head *list; | |
79 | snd_device_t *dev; | |
80 | ||
81 | snd_assert(card != NULL, return -ENXIO); | |
82 | snd_assert(device_data != NULL, return -ENXIO); | |
83 | list_for_each(list, &card->devices) { | |
84 | dev = snd_device(list); | |
85 | if (dev->device_data != device_data) | |
86 | continue; | |
87 | /* unlink */ | |
88 | list_del(&dev->list); | |
89 | if ((dev->state == SNDRV_DEV_REGISTERED || dev->state == SNDRV_DEV_DISCONNECTED) && | |
90 | dev->ops->dev_unregister) { | |
91 | if (dev->ops->dev_unregister(dev)) | |
92 | snd_printk(KERN_ERR "device unregister failure\n"); | |
93 | } else { | |
94 | if (dev->ops->dev_free) { | |
95 | if (dev->ops->dev_free(dev)) | |
96 | snd_printk(KERN_ERR "device free failure\n"); | |
97 | } | |
98 | } | |
99 | kfree(dev); | |
100 | return 0; | |
101 | } | |
102 | snd_printd("device free %p (from %p), not found\n", device_data, __builtin_return_address(0)); | |
103 | return -ENXIO; | |
104 | } | |
105 | ||
106 | /** | |
a3352f01 | 107 | * snd_device_disconnect - disconnect the device |
1da177e4 LT |
108 | * @card: the card instance |
109 | * @device_data: the data pointer to disconnect | |
110 | * | |
111 | * Turns the device into the disconnection state, invoking | |
112 | * dev_disconnect callback, if the device was already registered. | |
113 | * | |
114 | * Usually called from snd_card_disconnect(). | |
115 | * | |
116 | * Returns zero if successful, or a negative error code on failure or if the | |
117 | * device not found. | |
118 | */ | |
119 | int snd_device_disconnect(snd_card_t *card, void *device_data) | |
120 | { | |
121 | struct list_head *list; | |
122 | snd_device_t *dev; | |
a3352f01 | 123 | |
1da177e4 LT |
124 | snd_assert(card != NULL, return -ENXIO); |
125 | snd_assert(device_data != NULL, return -ENXIO); | |
126 | list_for_each(list, &card->devices) { | |
127 | dev = snd_device(list); | |
128 | if (dev->device_data != device_data) | |
129 | continue; | |
130 | if (dev->state == SNDRV_DEV_REGISTERED && dev->ops->dev_disconnect) { | |
131 | if (dev->ops->dev_disconnect(dev)) | |
132 | snd_printk(KERN_ERR "device disconnect failure\n"); | |
133 | dev->state = SNDRV_DEV_DISCONNECTED; | |
134 | } | |
135 | return 0; | |
136 | } | |
137 | snd_printd("device disconnect %p (from %p), not found\n", device_data, __builtin_return_address(0)); | |
138 | return -ENXIO; | |
139 | } | |
140 | ||
141 | /** | |
142 | * snd_device_register - register the device | |
143 | * @card: the card instance | |
144 | * @device_data: the data pointer to register | |
145 | * | |
146 | * Registers the device which was already created via | |
147 | * snd_device_new(). Usually this is called from snd_card_register(), | |
148 | * but it can be called later if any new devices are created after | |
149 | * invocation of snd_card_register(). | |
150 | * | |
151 | * Returns zero if successful, or a negative error code on failure or if the | |
152 | * device not found. | |
153 | */ | |
154 | int snd_device_register(snd_card_t *card, void *device_data) | |
155 | { | |
156 | struct list_head *list; | |
157 | snd_device_t *dev; | |
158 | int err; | |
a3352f01 HK |
159 | |
160 | snd_assert(card != NULL, return -ENXIO); | |
161 | snd_assert(device_data != NULL, return -ENXIO); | |
1da177e4 LT |
162 | list_for_each(list, &card->devices) { |
163 | dev = snd_device(list); | |
164 | 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 | } | |
172 | return -EBUSY; | |
173 | } | |
174 | snd_BUG(); | |
175 | return -ENXIO; | |
176 | } | |
177 | ||
178 | /* | |
179 | * register all the devices on the card. | |
180 | * called from init.c | |
181 | */ | |
182 | int snd_device_register_all(snd_card_t *card) | |
183 | { | |
184 | struct list_head *list; | |
185 | snd_device_t *dev; | |
186 | int err; | |
187 | ||
188 | snd_assert(card != NULL, return -ENXIO); | |
189 | list_for_each(list, &card->devices) { | |
190 | dev = snd_device(list); | |
191 | if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) { | |
192 | if ((err = dev->ops->dev_register(dev)) < 0) | |
193 | return err; | |
194 | dev->state = SNDRV_DEV_REGISTERED; | |
195 | } | |
196 | } | |
197 | return 0; | |
198 | } | |
199 | ||
200 | /* | |
201 | * disconnect all the devices on the card. | |
202 | * called from init.c | |
203 | */ | |
204 | int snd_device_disconnect_all(snd_card_t *card) | |
205 | { | |
206 | snd_device_t *dev; | |
207 | struct list_head *list; | |
208 | int err = 0; | |
209 | ||
210 | snd_assert(card != NULL, return -ENXIO); | |
211 | list_for_each(list, &card->devices) { | |
212 | dev = snd_device(list); | |
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 | */ | |
223 | int snd_device_free_all(snd_card_t *card, snd_device_cmd_t cmd) | |
224 | { | |
225 | snd_device_t *dev; | |
226 | struct list_head *list; | |
227 | int err; | |
228 | unsigned int range_low, range_high; | |
229 | ||
230 | snd_assert(card != NULL, return -ENXIO); | |
231 | range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE; | |
232 | range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1; | |
233 | __again: | |
234 | list_for_each(list, &card->devices) { | |
235 | dev = snd_device(list); | |
236 | 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 | } |