Bhalchandra Gajare | bb40f17 | 2019-08-21 15:07:28 -0700 | [diff] [blame] | 1 | /* snd_utils.c |
| 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 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <errno.h> |
| 34 | #include "snd_utils.h" |
| 35 | |
| 36 | #define SND_DLSYM(h, p, s, err) \ |
| 37 | do { \ |
| 38 | err = 0; \ |
| 39 | p = dlsym(h, s); \ |
| 40 | if (!p) \ |
| 41 | err = -ENODEV; \ |
| 42 | } while(0) |
| 43 | |
| 44 | int snd_utils_get_int(struct snd_node *node, const char *prop, int *val) |
| 45 | { |
| 46 | if (!node || !node->card_node || !node->dev_node) |
| 47 | return SND_NODE_TYPE_HW; |
| 48 | |
| 49 | return node->get_int(node->dev_node, prop, val); |
| 50 | } |
| 51 | |
| 52 | int snd_utils_get_str(struct snd_node *node, const char *prop, char **val) |
| 53 | { |
| 54 | if (!node || !node->card_node || !node->dev_node) |
| 55 | return SND_NODE_TYPE_HW; |
| 56 | |
| 57 | return node->get_str(node->dev_node, prop, val); |
| 58 | } |
| 59 | |
| 60 | void snd_utils_put_dev_node(struct snd_node *node) |
| 61 | { |
| 62 | if (!node) |
| 63 | return; |
| 64 | |
| 65 | if (node->card_node) |
| 66 | node->put_card(node->card_node); |
| 67 | |
| 68 | if (node->dl_hdl) |
| 69 | dlclose(node->dl_hdl); |
| 70 | |
| 71 | free(node); |
| 72 | } |
| 73 | |
| 74 | enum snd_node_type snd_utils_get_node_type(struct snd_node *node) |
| 75 | { |
| 76 | int val = SND_NODE_TYPE_HW; |
| 77 | |
| 78 | if (!node || !node->card_node || !node->dev_node) |
| 79 | return SND_NODE_TYPE_HW; |
| 80 | |
| 81 | node->get_int(node->dev_node, "type", &val); |
| 82 | |
| 83 | return val; |
| 84 | }; |
| 85 | |
| 86 | |
| 87 | static int snd_utils_resolve_symbols(struct snd_node *node) |
| 88 | { |
| 89 | void *dl = node->dl_hdl; |
| 90 | int err; |
| 91 | |
| 92 | SND_DLSYM(dl, node->get_card, "snd_card_def_get_card", err); |
| 93 | if (err) |
| 94 | goto done; |
| 95 | SND_DLSYM(dl, node->put_card, "snd_card_def_put_card", err); |
| 96 | if (err) |
| 97 | goto done; |
| 98 | SND_DLSYM(dl, node->get_node, "snd_card_def_get_node", err); |
| 99 | if (err) |
| 100 | goto done; |
| 101 | SND_DLSYM(dl, node->get_int, "snd_card_def_get_int", err); |
| 102 | if (err) |
| 103 | goto done; |
| 104 | SND_DLSYM(dl, node->get_str, "snd_card_def_get_str", err); |
| 105 | |
| 106 | done: |
| 107 | return err; |
| 108 | } |
| 109 | |
| 110 | struct snd_node *snd_utils_get_dev_node(unsigned int card, |
| 111 | unsigned int device, int dev_type) |
| 112 | { |
| 113 | struct snd_node *node; |
| 114 | int rc = 0; |
| 115 | |
| 116 | node = calloc(1, sizeof(*node)); |
| 117 | if (!node) |
| 118 | return NULL; |
| 119 | |
| 120 | node->dl_hdl = dlopen("libsndcardparser.so", RTLD_NOW); |
| 121 | if (!node->dl_hdl) { |
| 122 | goto err_dl_open; |
| 123 | } |
| 124 | |
| 125 | rc = snd_utils_resolve_symbols(node); |
| 126 | if (rc < 0) |
| 127 | goto err_resolve_symbols; |
| 128 | |
| 129 | node->card_node = node->get_card(card); |
| 130 | if (!node->card_node) |
| 131 | goto err_resolve_symbols; |
| 132 | |
| 133 | node->dev_node = node->get_node(node->card_node, |
| 134 | device, dev_type); |
| 135 | if (!node->dev_node) |
| 136 | goto err_get_node; |
| 137 | |
| 138 | return node; |
| 139 | |
| 140 | err_get_node: |
| 141 | node->put_card(node->card_node); |
| 142 | |
| 143 | err_resolve_symbols: |
| 144 | dlclose(node->dl_hdl); |
| 145 | |
| 146 | err_dl_open: |
| 147 | free(node); |
| 148 | return NULL; |
| 149 | } |