mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-04 13:30:08 -05:00
c39882f602
- changed snd_config_get_id function to follow semantic of other get functions
- added snd_config_test_id
- added runtime pointer type (not persistent)
- added snd_config_make_pointer, snd_config_set_pointer, snd_config_get_pointer
- added type/contents checking for callback functions
- changed 'void *private_data' to 'snd_config_t *private_data'
- renamed card_strtype functions to card_driver
Control:
- fixed passing parameters to snd_ctl_async
Async handlers:
- added public snd_async_handler_get_signo function
Documentation:
- moved all documentation to source files
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* Timer Interface - main file
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* Copyright (c) 1998-2001 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include "timer_local.h"
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#ifndef PIC
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/* entry for static linking */
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const char *_snd_module_timer_query_hw = "";
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#endif
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#define SNDRV_FILE_TIMER "/dev/snd/timer"
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#define SNDRV_TIMER_VERSION_MAX SNDRV_PROTOCOL_VERSION(2, 0, 0)
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static int snd_timer_query_hw_close(snd_timer_query_t *handle)
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{
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int res;
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if (!handle)
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return -EINVAL;
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res = close(handle->poll_fd) < 0 ? -errno : 0;
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return res;
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}
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static int snd_timer_query_hw_next_device(snd_timer_query_t *handle, snd_timer_id_t * tid)
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{
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if (!handle || !tid)
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return -EINVAL;
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if (ioctl(handle->poll_fd, SNDRV_TIMER_IOCTL_NEXT_DEVICE, tid) < 0)
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return -errno;
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return 0;
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}
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static snd_timer_query_ops_t snd_timer_query_hw_ops = {
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close: snd_timer_query_hw_close,
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next_device: snd_timer_query_hw_next_device,
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};
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int snd_timer_query_hw_open(snd_timer_query_t **handle, const char *name, int mode)
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{
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int fd, ver, tmode;
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snd_timer_query_t *tmr;
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*handle = NULL;
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tmode = O_RDONLY;
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if (mode & SND_TIMER_OPEN_NONBLOCK)
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tmode |= O_NONBLOCK;
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if ((fd = open(SNDRV_FILE_TIMER, tmode)) < 0)
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return -errno;
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if (ioctl(fd, SNDRV_TIMER_IOCTL_PVERSION, &ver) < 0) {
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close(fd);
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return -errno;
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}
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if (SNDRV_PROTOCOL_INCOMPATIBLE(ver, SNDRV_TIMER_VERSION_MAX)) {
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close(fd);
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return -SND_ERROR_INCOMPATIBLE_VERSION;
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}
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tmr = (snd_timer_query_t *) calloc(1, sizeof(snd_timer_t));
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if (tmr == NULL) {
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close(fd);
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return -ENOMEM;
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}
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tmr->type = SND_TIMER_TYPE_HW;
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tmr->mode = tmode;
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tmr->name = strdup(name);
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tmr->poll_fd = fd;
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tmr->ops = &snd_timer_query_hw_ops;
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*handle = tmr;
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return 0;
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}
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int _snd_timer_query_hw_open(snd_timer_query_t **timer, char *name,
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snd_config_t *root ATTRIBUTE_UNUSED,
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snd_config_t *conf, int mode)
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{
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snd_config_iterator_t i, next;
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snd_config_for_each(i, next, conf) {
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snd_config_t *n = snd_config_iterator_entry(i);
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const char *id;
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (strcmp(id, "comment") == 0)
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continue;
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if (strcmp(id, "type") == 0)
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continue;
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SNDERR("Unexpected field %s", id);
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return -EINVAL;
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}
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return snd_timer_query_hw_open(timer, name, mode);
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}
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SND_DLSYM_BUILD_VERSION(_snd_timer_query_hw_open, SND_TIMER_QUERY_DLSYM_VERSION);
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