1 /* snd_utils.h 2 ** 3 ** Copyright (c) 2019, The Linux Foundation. All rights reserved. 4 ** 5 ** Redistribution and use in source and binary forms, with or without 6 ** modification, are permitted provided that the following conditions are 7 ** met: 8 ** * Redistributions of source code must retain the above copyright 9 ** notice, this list of conditions and the following disclaimer. 10 ** * Redistributions in binary form must reproduce the above 11 ** copyright notice, this list of conditions and the following 12 ** disclaimer in the documentation and/or other materials provided 13 ** with the distribution. 14 ** * Neither the name of The Linux Foundation nor the names of its 15 ** contributors may be used to endorse or promote products derived 16 ** from this software without specific prior written permission. 17 ** 18 ** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 19 ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 20 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 21 ** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 22 ** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 25 ** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 ** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 27 ** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 28 ** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 **/ 30 31 #ifndef __SND_CARD_UTILS_H__ 32 #define __SND_CARD_UTILS_H__ 33 34 #include <dlfcn.h> 35 36 struct snd_node { 37 void *card_node; 38 void *dev_node; 39 void *dl_hdl; 40 41 void* (*get_card) (unsigned int card); 42 void (*put_card) (void *card); 43 void* (*get_node) (void *card, unsigned int id, 44 int type); 45 int (*get_int) (void *node, const char *prop, int *val); 46 int (*get_str) (void *node, const char *prop, char **val); 47 }; 48 49 enum { 50 NODE_PCM, 51 NODE_MIXER, 52 }; 53 54 enum snd_node_type { 55 SND_NODE_TYPE_HW = 0, 56 SND_NODE_TYPE_PLUGIN, 57 SND_NODE_TYPE_INVALID, 58 }; 59 60 struct snd_node *snd_utils_get_dev_node(unsigned int card, 61 unsigned int device, int dev_type); 62 63 void snd_utils_put_dev_node(struct snd_node *node); 64 65 enum snd_node_type snd_utils_get_node_type(struct snd_node *node); 66 67 int snd_utils_get_int(struct snd_node *node, const char *prop, int *val); 68 69 int snd_utils_get_str(struct snd_node *node, const char *prop, char **val); 70 71 #endif /* end of __SND_CARD_UTILS_H__ */ 72