Branch data Line data Source code
1 : : /*
2 : : * Device management routines
3 : : * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/slab.h>
23 : : #include <linux/time.h>
24 : : #include <linux/export.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
31 : : * @type: the device type, SNDRV_DEV_XXX
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 : : * Return: Zero if successful, or a negative error code on failure.
43 : : */
44 : 0 : int snd_device_new(struct snd_card *card, snd_device_type_t type,
45 : : void *device_data, struct snd_device_ops *ops)
46 : : {
47 : : struct snd_device *dev;
48 : :
49 [ # # ][ # # ]: 0 : if (snd_BUG_ON(!card || !device_data || !ops))
[ # # ]
50 : : return -ENXIO;
51 : : dev = kzalloc(sizeof(*dev), GFP_KERNEL);
52 [ # # ]: 0 : if (dev == NULL) {
53 : 0 : snd_printk(KERN_ERR "Cannot allocate device\n");
54 : 0 : return -ENOMEM;
55 : : }
56 : 0 : dev->card = card;
57 : 0 : dev->type = type;
58 : 0 : dev->state = SNDRV_DEV_BUILD;
59 : 0 : dev->device_data = device_data;
60 : 0 : dev->ops = ops;
61 : 0 : list_add(&dev->list, &card->devices); /* add to the head of list */
62 : 0 : return 0;
63 : : }
64 : :
65 : : EXPORT_SYMBOL(snd_device_new);
66 : :
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
73 : : * callbacks, dev_disconnect and dev_free, corresponding to the state.
74 : : * Then release the device.
75 : : *
76 : : * Return: Zero if successful, or a negative error code on failure or if the
77 : : * device not found.
78 : : */
79 : 0 : int snd_device_free(struct snd_card *card, void *device_data)
80 : : {
81 : : struct snd_device *dev;
82 : :
83 [ # # ]: 0 : if (snd_BUG_ON(!card || !device_data))
84 : : return -ENXIO;
85 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
86 [ # # ]: 0 : if (dev->device_data != device_data)
87 : 0 : continue;
88 : : /* unlink */
89 : : list_del(&dev->list);
90 [ # # ][ # # ]: 0 : if (dev->state == SNDRV_DEV_REGISTERED &&
91 : 0 : dev->ops->dev_disconnect)
92 [ # # ]: 0 : if (dev->ops->dev_disconnect(dev))
93 : 0 : snd_printk(KERN_ERR
94 : : "device disconnect failure\n");
95 [ # # ]: 0 : if (dev->ops->dev_free) {
96 [ # # ]: 0 : if (dev->ops->dev_free(dev))
97 : 0 : snd_printk(KERN_ERR "device free failure\n");
98 : : }
99 : 0 : kfree(dev);
100 : 0 : return 0;
101 : : }
102 : 0 : snd_printd("device free %p (from %pF), not found\n", device_data,
103 : : __builtin_return_address(0));
104 : 0 : return -ENXIO;
105 : : }
106 : :
107 : : EXPORT_SYMBOL(snd_device_free);
108 : :
109 : : /**
110 : : * snd_device_disconnect - disconnect the device
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 : : * Return: Zero if successful, or a negative error code on failure or if the
120 : : * device not found.
121 : : */
122 : 0 : int snd_device_disconnect(struct snd_card *card, void *device_data)
123 : : {
124 : : struct snd_device *dev;
125 : :
126 [ # # ]: 0 : if (snd_BUG_ON(!card || !device_data))
127 : : return -ENXIO;
128 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
129 [ # # ]: 0 : if (dev->device_data != device_data)
130 : 0 : continue;
131 [ # # ][ # # ]: 0 : if (dev->state == SNDRV_DEV_REGISTERED &&
132 : 0 : dev->ops->dev_disconnect) {
133 [ # # ]: 0 : if (dev->ops->dev_disconnect(dev))
134 : 0 : snd_printk(KERN_ERR "device disconnect failure\n");
135 : 0 : dev->state = SNDRV_DEV_DISCONNECTED;
136 : : }
137 : : return 0;
138 : : }
139 : 0 : snd_printd("device disconnect %p (from %pF), not found\n", device_data,
140 : : __builtin_return_address(0));
141 : 0 : 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 : : * Return: Zero if successful, or a negative error code on failure or if the
155 : : * device not found.
156 : : */
157 : 0 : int snd_device_register(struct snd_card *card, void *device_data)
158 : : {
159 : : struct snd_device *dev;
160 : : int err;
161 : :
162 [ # # ]: 0 : if (snd_BUG_ON(!card || !device_data))
163 : : return -ENXIO;
164 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
165 [ # # ]: 0 : if (dev->device_data != device_data)
166 : 0 : continue;
167 [ # # ][ # # ]: 0 : if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
168 [ # # ]: 0 : if ((err = dev->ops->dev_register(dev)) < 0)
169 : : return err;
170 : 0 : dev->state = SNDRV_DEV_REGISTERED;
171 : 0 : return 0;
172 : : }
173 : : snd_printd("snd_device_register busy\n");
174 : : return -EBUSY;
175 : : }
176 : : snd_BUG();
177 : : return -ENXIO;
178 : : }
179 : :
180 : : EXPORT_SYMBOL(snd_device_register);
181 : :
182 : : /*
183 : : * register all the devices on the card.
184 : : * called from init.c
185 : : */
186 : 0 : int snd_device_register_all(struct snd_card *card)
187 : : {
188 : : struct snd_device *dev;
189 : : int err;
190 : :
191 [ # # ]: 0 : if (snd_BUG_ON(!card))
192 : : return -ENXIO;
193 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
194 [ # # ][ # # ]: 0 : if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
195 [ # # ]: 0 : if ((err = dev->ops->dev_register(dev)) < 0)
196 : : return err;
197 : 0 : 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 : : */
207 : 0 : int snd_device_disconnect_all(struct snd_card *card)
208 : : {
209 : : struct snd_device *dev;
210 : : int err = 0;
211 : :
212 [ # # ]: 0 : if (snd_BUG_ON(!card))
213 : : return -ENXIO;
214 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
215 [ # # ]: 0 : 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 : : */
225 : 0 : int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
226 : : {
227 : : struct snd_device *dev;
228 : : int err;
229 : : unsigned int range_low, range_high, type;
230 : :
231 [ # # ]: 0 : if (snd_BUG_ON(!card))
232 : : return -ENXIO;
233 : 0 : range_low = (__force unsigned int)cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
234 : 0 : range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
235 : : __again:
236 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
237 : 0 : type = (__force unsigned int)dev->type;
238 [ # # ]: 0 : if (type >= range_low && type <= range_high) {
239 [ # # ]: 0 : if ((err = snd_device_free(card, dev->device_data)) < 0)
240 : : return err;
241 : : goto __again;
242 : : }
243 : : }
244 : : return 0;
245 : : }
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