device.c (2fc2991175bf77395e6b15fe6b2304d3bf72da40) device.c (512bbd6a85230f16389f0dd51925472e72fc8a91)
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

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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 */
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

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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 */
44int snd_device_new(snd_card_t *card, snd_device_type_t type,
45 void *device_data, snd_device_ops_t *ops)
44int snd_device_new(struct snd_card *card, snd_device_type_t type,
45 void *device_data, struct snd_device_ops *ops)
46{
46{
47 snd_device_t *dev;
47 struct snd_device *dev;
48
49 snd_assert(card != NULL, return -ENXIO);
50 snd_assert(device_data != NULL, return -ENXIO);
51 snd_assert(ops != NULL, return -ENXIO);
52 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
53 if (dev == NULL)
54 return -ENOMEM;
55 dev->card = card;

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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 */
48
49 snd_assert(card != NULL, return -ENXIO);
50 snd_assert(device_data != NULL, return -ENXIO);
51 snd_assert(ops != NULL, return -ENXIO);
52 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
53 if (dev == NULL)
54 return -ENOMEM;
55 dev->card = card;

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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 */
76int snd_device_free(snd_card_t *card, void *device_data)
76int snd_device_free(struct snd_card *card, void *device_data)
77{
78 struct list_head *list;
77{
78 struct list_head *list;
79 snd_device_t *dev;
79 struct snd_device *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);
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) &&
89 if ((dev->state == SNDRV_DEV_REGISTERED ||
90 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 }
91 dev->ops->dev_unregister) {
92 if (dev->ops->dev_unregister(dev))
93 snd_printk(KERN_ERR "device unregister failure\n");
94 } else {
95 if (dev->ops->dev_free) {
96 if (dev->ops->dev_free(dev))
97 snd_printk(KERN_ERR "device free failure\n");
98 }
99 }
100 kfree(dev);
101 return 0;
102 }
102 snd_printd("device free %p (from %p), not found\n", device_data, __builtin_return_address(0));
103 snd_printd("device free %p (from %p), not found\n", device_data,
104 __builtin_return_address(0));
103 return -ENXIO;
104}
105
106/**
107 * snd_device_disconnect - disconnect the device
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 */
105 return -ENXIO;
106}
107
108/**
109 * snd_device_disconnect - disconnect the device
110 * @card: the card instance
111 * @device_data: the data pointer to disconnect
112 *
113 * Turns the device into the disconnection state, invoking
114 * dev_disconnect callback, if the device was already registered.
115 *
116 * Usually called from snd_card_disconnect().
117 *
118 * Returns zero if successful, or a negative error code on failure or if the
119 * device not found.
120 */
119int snd_device_disconnect(snd_card_t *card, void *device_data)
121int snd_device_disconnect(struct snd_card *card, void *device_data)
120{
121 struct list_head *list;
122{
123 struct list_head *list;
122 snd_device_t *dev;
124 struct snd_device *dev;
123
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;
125
126 snd_assert(card != NULL, return -ENXIO);
127 snd_assert(device_data != NULL, return -ENXIO);
128 list_for_each(list, &card->devices) {
129 dev = snd_device(list);
130 if (dev->device_data != device_data)
131 continue;
130 if (dev->state == SNDRV_DEV_REGISTERED && dev->ops->dev_disconnect) {
132 if (dev->state == SNDRV_DEV_REGISTERED &&
133 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 }
134 if (dev->ops->dev_disconnect(dev))
135 snd_printk(KERN_ERR "device disconnect failure\n");
136 dev->state = SNDRV_DEV_DISCONNECTED;
137 }
138 return 0;
139 }
137 snd_printd("device disconnect %p (from %p), not found\n", device_data, __builtin_return_address(0));
140 snd_printd("device disconnect %p (from %p), not found\n", device_data,
141 __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 */
142 return -ENXIO;
143}
144
145/**
146 * snd_device_register - register the device
147 * @card: the card instance
148 * @device_data: the data pointer to register
149 *
150 * Registers the device which was already created via
151 * snd_device_new(). Usually this is called from snd_card_register(),
152 * but it can be called later if any new devices are created after
153 * invocation of snd_card_register().
154 *
155 * Returns zero if successful, or a negative error code on failure or if the
156 * device not found.
157 */
154int snd_device_register(snd_card_t *card, void *device_data)
158int snd_device_register(struct snd_card *card, void *device_data)
155{
156 struct list_head *list;
159{
160 struct list_head *list;
157 snd_device_t *dev;
161 struct snd_device *dev;
158 int err;
159
160 snd_assert(card != NULL, return -ENXIO);
161 snd_assert(device_data != NULL, return -ENXIO);
162 list_for_each(list, &card->devices) {
163 dev = snd_device(list);
164 if (dev->device_data != device_data)
165 continue;

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174 snd_BUG();
175 return -ENXIO;
176}
177
178/*
179 * register all the devices on the card.
180 * called from init.c
181 */
162 int err;
163
164 snd_assert(card != NULL, return -ENXIO);
165 snd_assert(device_data != NULL, return -ENXIO);
166 list_for_each(list, &card->devices) {
167 dev = snd_device(list);
168 if (dev->device_data != device_data)
169 continue;

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178 snd_BUG();
179 return -ENXIO;
180}
181
182/*
183 * register all the devices on the card.
184 * called from init.c
185 */
182int snd_device_register_all(snd_card_t *card)
186int snd_device_register_all(struct snd_card *card)
183{
184 struct list_head *list;
187{
188 struct list_head *list;
185 snd_device_t *dev;
189 struct snd_device *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 */
190 int err;
191
192 snd_assert(card != NULL, return -ENXIO);
193 list_for_each(list, &card->devices) {
194 dev = snd_device(list);
195 if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
196 if ((err = dev->ops->dev_register(dev)) < 0)
197 return err;
198 dev->state = SNDRV_DEV_REGISTERED;
199 }
200 }
201 return 0;
202}
203
204/*
205 * disconnect all the devices on the card.
206 * called from init.c
207 */
204int snd_device_disconnect_all(snd_card_t *card)
208int snd_device_disconnect_all(struct snd_card *card)
205{
209{
206 snd_device_t *dev;
210 struct snd_device *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 */
211 struct list_head *list;
212 int err = 0;
213
214 snd_assert(card != NULL, return -ENXIO);
215 list_for_each(list, &card->devices) {
216 dev = snd_device(list);
217 if (snd_device_disconnect(card, dev->device_data) < 0)
218 err = -ENXIO;
219 }
220 return err;
221}
222
223/*
224 * release all the devices on the card.
225 * called from init.c
226 */
223int snd_device_free_all(snd_card_t *card, snd_device_cmd_t cmd)
227int snd_device_free_all(struct snd_card *card, snd_device_cmd_t cmd)
224{
228{
225 snd_device_t *dev;
229 struct snd_device *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}
230 struct list_head *list;
231 int err;
232 unsigned int range_low, range_high;
233
234 snd_assert(card != NULL, return -ENXIO);
235 range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
236 range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
237 __again:
238 list_for_each(list, &card->devices) {
239 dev = snd_device(list);
240 if (dev->type >= range_low && dev->type <= range_high) {
241 if ((err = snd_device_free(card, dev->device_data)) < 0)
242 return err;
243 goto __again;
244 }
245 }
246 return 0;
247}