Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0-or-later
2 : : /*
3 : : * Device management routines
4 : : * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 : : */
6 : :
7 : : #include <linux/slab.h>
8 : : #include <linux/time.h>
9 : : #include <linux/export.h>
10 : : #include <linux/errno.h>
11 : : #include <sound/core.h>
12 : :
13 : : /**
14 : : * snd_device_new - create an ALSA device component
15 : : * @card: the card instance
16 : : * @type: the device type, SNDRV_DEV_XXX
17 : : * @device_data: the data pointer of this device
18 : : * @ops: the operator table
19 : : *
20 : : * Creates a new device component for the given data pointer.
21 : : * The device will be assigned to the card and managed together
22 : : * by the card.
23 : : *
24 : : * The data pointer plays a role as the identifier, too, so the
25 : : * pointer address must be unique and unchanged.
26 : : *
27 : : * Return: Zero if successful, or a negative error code on failure.
28 : : */
29 : 0 : int snd_device_new(struct snd_card *card, enum snd_device_type type,
30 : : void *device_data, const struct snd_device_ops *ops)
31 : : {
32 : 0 : struct snd_device *dev;
33 : 0 : struct list_head *p;
34 : :
35 [ # # # # : 0 : if (snd_BUG_ON(!card || !device_data || !ops))
# # ]
36 : : return -ENXIO;
37 : 0 : dev = kzalloc(sizeof(*dev), GFP_KERNEL);
38 [ # # ]: 0 : if (!dev)
39 : : return -ENOMEM;
40 : 0 : INIT_LIST_HEAD(&dev->list);
41 : 0 : dev->card = card;
42 : 0 : dev->type = type;
43 : 0 : dev->state = SNDRV_DEV_BUILD;
44 : 0 : dev->device_data = device_data;
45 : 0 : dev->ops = ops;
46 : :
47 : : /* insert the entry in an incrementally sorted list */
48 [ # # ]: 0 : list_for_each_prev(p, &card->devices) {
49 : 0 : struct snd_device *pdev = list_entry(p, struct snd_device, list);
50 [ # # ]: 0 : if ((unsigned int)pdev->type <= (unsigned int)type)
51 : : break;
52 : : }
53 : :
54 : 0 : list_add(&dev->list, p);
55 : 0 : return 0;
56 : : }
57 : : EXPORT_SYMBOL(snd_device_new);
58 : :
59 : 0 : static void __snd_device_disconnect(struct snd_device *dev)
60 : : {
61 [ # # ]: 0 : if (dev->state == SNDRV_DEV_REGISTERED) {
62 [ # # # # ]: 0 : if (dev->ops->dev_disconnect &&
63 : 0 : dev->ops->dev_disconnect(dev))
64 : 0 : dev_err(dev->card->dev, "device disconnect failure\n");
65 : 0 : dev->state = SNDRV_DEV_DISCONNECTED;
66 : : }
67 : 0 : }
68 : :
69 : 0 : static void __snd_device_free(struct snd_device *dev)
70 : : {
71 : : /* unlink */
72 : 0 : list_del(&dev->list);
73 : :
74 : 0 : __snd_device_disconnect(dev);
75 [ # # ]: 0 : if (dev->ops->dev_free) {
76 [ # # ]: 0 : if (dev->ops->dev_free(dev))
77 : 0 : dev_err(dev->card->dev, "device free failure\n");
78 : : }
79 : 0 : kfree(dev);
80 : 0 : }
81 : :
82 : 0 : static struct snd_device *look_for_dev(struct snd_card *card, void *device_data)
83 : : {
84 : 0 : struct snd_device *dev;
85 : :
86 [ # # # # : 0 : list_for_each_entry(dev, &card->devices, list)
# # ]
87 [ # # # # : 0 : if (dev->device_data == device_data)
# # ]
88 : : return dev;
89 : :
90 : : return NULL;
91 : : }
92 : :
93 : : /**
94 : : * snd_device_disconnect - disconnect the device
95 : : * @card: the card instance
96 : : * @device_data: the data pointer to disconnect
97 : : *
98 : : * Turns the device into the disconnection state, invoking
99 : : * dev_disconnect callback, if the device was already registered.
100 : : *
101 : : * Usually called from snd_card_disconnect().
102 : : *
103 : : * Return: Zero if successful, or a negative error code on failure or if the
104 : : * device not found.
105 : : */
106 : 0 : void snd_device_disconnect(struct snd_card *card, void *device_data)
107 : : {
108 : 0 : struct snd_device *dev;
109 : :
110 [ # # ]: 0 : if (snd_BUG_ON(!card || !device_data))
111 : : return;
112 : 0 : dev = look_for_dev(card, device_data);
113 [ # # ]: 0 : if (dev)
114 : 0 : __snd_device_disconnect(dev);
115 : : else
116 : : dev_dbg(card->dev, "device disconnect %p (from %pS), not found\n",
117 : : device_data, __builtin_return_address(0));
118 : : }
119 : : EXPORT_SYMBOL_GPL(snd_device_disconnect);
120 : :
121 : : /**
122 : : * snd_device_free - release the device from the card
123 : : * @card: the card instance
124 : : * @device_data: the data pointer to release
125 : : *
126 : : * Removes the device from the list on the card and invokes the
127 : : * callbacks, dev_disconnect and dev_free, corresponding to the state.
128 : : * Then release the device.
129 : : */
130 : 0 : void snd_device_free(struct snd_card *card, void *device_data)
131 : : {
132 : 0 : struct snd_device *dev;
133 : :
134 [ # # ]: 0 : if (snd_BUG_ON(!card || !device_data))
135 : : return;
136 : 0 : dev = look_for_dev(card, device_data);
137 [ # # ]: 0 : if (dev)
138 : 0 : __snd_device_free(dev);
139 : : else
140 : : dev_dbg(card->dev, "device free %p (from %pS), not found\n",
141 : : device_data, __builtin_return_address(0));
142 : : }
143 : : EXPORT_SYMBOL(snd_device_free);
144 : :
145 : 0 : static int __snd_device_register(struct snd_device *dev)
146 : : {
147 : 0 : if (dev->state == SNDRV_DEV_BUILD) {
148 [ # # # # ]: 0 : if (dev->ops->dev_register) {
149 : 0 : int err = dev->ops->dev_register(dev);
150 [ # # # # ]: 0 : if (err < 0)
151 : : return err;
152 : : }
153 : 0 : dev->state = SNDRV_DEV_REGISTERED;
154 : : }
155 : : return 0;
156 : : }
157 : :
158 : : /**
159 : : * snd_device_register - register the device
160 : : * @card: the card instance
161 : : * @device_data: the data pointer to register
162 : : *
163 : : * Registers the device which was already created via
164 : : * snd_device_new(). Usually this is called from snd_card_register(),
165 : : * but it can be called later if any new devices are created after
166 : : * invocation of snd_card_register().
167 : : *
168 : : * Return: Zero if successful, or a negative error code on failure or if the
169 : : * device not found.
170 : : */
171 : 0 : int snd_device_register(struct snd_card *card, void *device_data)
172 : : {
173 : 0 : struct snd_device *dev;
174 : :
175 [ # # ]: 0 : if (snd_BUG_ON(!card || !device_data))
176 : : return -ENXIO;
177 : 0 : dev = look_for_dev(card, device_data);
178 [ # # ]: 0 : if (dev)
179 [ # # ]: 0 : return __snd_device_register(dev);
180 : : snd_BUG();
181 : : return -ENXIO;
182 : : }
183 : : EXPORT_SYMBOL(snd_device_register);
184 : :
185 : : /*
186 : : * register all the devices on the card.
187 : : * called from init.c
188 : : */
189 : 0 : int snd_device_register_all(struct snd_card *card)
190 : : {
191 : 0 : struct snd_device *dev;
192 : 0 : int err;
193 : :
194 [ # # ]: 0 : if (snd_BUG_ON(!card))
195 : : return -ENXIO;
196 [ # # ]: 0 : list_for_each_entry(dev, &card->devices, list) {
197 [ # # ]: 0 : err = __snd_device_register(dev);
198 : 0 : if (err < 0)
199 : 0 : return err;
200 : : }
201 : : return 0;
202 : : }
203 : :
204 : : /*
205 : : * disconnect all the devices on the card.
206 : : * called from init.c
207 : : */
208 : 0 : void snd_device_disconnect_all(struct snd_card *card)
209 : : {
210 : 0 : struct snd_device *dev;
211 : :
212 [ # # ]: 0 : if (snd_BUG_ON(!card))
213 : : return;
214 [ # # ]: 0 : list_for_each_entry_reverse(dev, &card->devices, list)
215 : 0 : __snd_device_disconnect(dev);
216 : : }
217 : :
218 : : /*
219 : : * release all the devices on the card.
220 : : * called from init.c
221 : : */
222 : 0 : void snd_device_free_all(struct snd_card *card)
223 : : {
224 : 0 : struct snd_device *dev, *next;
225 : :
226 [ # # ]: 0 : if (snd_BUG_ON(!card))
227 : : return;
228 [ # # ]: 0 : list_for_each_entry_safe_reverse(dev, next, &card->devices, list) {
229 : : /* exception: free ctl and lowlevel stuff later */
230 [ # # ]: 0 : if (dev->type == SNDRV_DEV_CONTROL ||
231 : : dev->type == SNDRV_DEV_LOWLEVEL)
232 : 0 : continue;
233 : 0 : __snd_device_free(dev);
234 : : }
235 : :
236 : : /* free all */
237 [ # # ]: 0 : list_for_each_entry_safe_reverse(dev, next, &card->devices, list)
238 : 0 : __snd_device_free(dev);
239 : : }
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