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https://github.com/alsa-project/alsa-lib.git
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Updated timer interface to follow new uniform configuration style.
This commit is contained in:
Jaroslav Kysela
parent
239182657d
commit
bf858b7312
8 changed files with 1030 additions and 144 deletions
261
src/timer/timer_hw.c
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261
src/timer/timer_hw.c
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/*
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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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#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_hw_close(snd_timer_t *handle)
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{
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snd_timer_t *tmr = handle;
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int res;
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if (!tmr)
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return -EINVAL;
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res = close(tmr->poll_fd) < 0 ? -errno : 0;
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return res;
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}
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static int snd_timer_hw_nonblock(snd_timer_t *timer, int nonblock)
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{
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long flags;
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assert(timer);
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if ((flags = fcntl(timer->poll_fd, F_GETFL)) < 0)
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return -errno;
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if (nonblock)
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flags |= O_NONBLOCK;
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else
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flags &= ~O_NONBLOCK;
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if (fcntl(timer->poll_fd, F_SETFL, flags) < 0)
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return -errno;
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return 0;
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}
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static int snd_timer_hw_info(snd_timer_t *handle, snd_timer_info_t * info)
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{
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snd_timer_t *tmr;
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tmr = handle;
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if (!tmr || !info)
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return -EINVAL;
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if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_INFO, info) < 0)
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return -errno;
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return 0;
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}
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static int snd_timer_hw_params(snd_timer_t *handle, snd_timer_params_t * params)
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{
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snd_timer_t *tmr;
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tmr = handle;
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if (!tmr || !params)
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return -EINVAL;
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if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_PARAMS, params) < 0)
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return -errno;
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return 0;
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}
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static int snd_timer_hw_status(snd_timer_t *handle, snd_timer_status_t * status)
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{
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snd_timer_t *tmr;
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tmr = handle;
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if (!tmr || !status)
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return -EINVAL;
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if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_STATUS, status) < 0)
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return -errno;
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return 0;
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}
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static int snd_timer_hw_start(snd_timer_t *handle)
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{
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snd_timer_t *tmr;
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tmr = handle;
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if (!tmr)
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return -EINVAL;
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if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_START) < 0)
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return -errno;
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return 0;
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}
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static int snd_timer_hw_stop(snd_timer_t *handle)
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{
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snd_timer_t *tmr;
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tmr = handle;
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if (!tmr)
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return -EINVAL;
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if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_STOP) < 0)
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return -errno;
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return 0;
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}
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static int snd_timer_hw_continue(snd_timer_t *handle)
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{
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snd_timer_t *tmr;
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tmr = handle;
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if (!tmr)
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return -EINVAL;
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if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_CONTINUE) < 0)
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return -errno;
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return 0;
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}
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static ssize_t snd_timer_hw_read(snd_timer_t *handle, void *buffer, size_t size)
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{
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snd_timer_t *tmr;
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ssize_t result;
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tmr = handle;
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if (!tmr || (!buffer && size > 0))
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return -EINVAL;
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result = read(tmr->poll_fd, buffer, size);
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if (result < 0)
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return -errno;
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return result;
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}
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static snd_timer_ops_t snd_timer_hw_ops = {
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close: snd_timer_hw_close,
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nonblock: snd_timer_hw_nonblock,
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info: snd_timer_hw_info,
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params: snd_timer_hw_params,
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status: snd_timer_hw_status,
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rt_start: snd_timer_hw_start,
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rt_stop: snd_timer_hw_stop,
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rt_continue: snd_timer_hw_continue,
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read: snd_timer_hw_read,
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};
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int snd_timer_hw_open(snd_timer_t **handle, const char *name, int dev_class, int dev_sclass, int card, int device, int subdevice, int mode)
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{
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int fd, ver, tmode;
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snd_timer_t *tmr;
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snd_timer_id_t id;
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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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memset(&id, 0, sizeof(id));
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id.dev_class = dev_class;
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id.dev_sclass = dev_sclass;
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id.card = card;
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id.device = device;
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id.subdevice = subdevice;
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if (ioctl(fd, SNDRV_TIMER_IOCTL_SELECT, &id) < 0) {
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int err = -errno;
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close(fd);
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return err;
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}
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tmr = (snd_timer_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_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_hw_open(snd_timer_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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long dev_class = SND_TIMER_CLASS_GLOBAL, dev_sclass = SND_TIMER_SCLASS_NONE;
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long card = 0, device = 0, subdevice = 0;
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const char *str;
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int err;
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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 = snd_config_get_id(n);
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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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if (strcmp(id, "class") == 0) {
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err = snd_config_get_integer(n, &dev_class);
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if (err < 0)
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return err;
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continue;
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}
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if (strcmp(id, "sclass") == 0) {
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err = snd_config_get_integer(n, &dev_sclass);
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if (err < 0)
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return err;
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continue;
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}
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if (strcmp(id, "card") == 0) {
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err = snd_config_get_integer(n, &card);
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if (err < 0) {
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err = snd_config_get_string(n, &str);
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if (err < 0)
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return -EINVAL;
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card = snd_card_get_index(str);
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if (card < 0)
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return card;
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}
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continue;
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}
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if (strcmp(id, "device") == 0) {
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err = snd_config_get_integer(n, &device);
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if (err < 0)
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return err;
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continue;
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}
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if (strcmp(id, "subdevice") == 0) {
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err = snd_config_get_integer(n, &subdevice);
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if (err < 0)
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return err;
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continue;
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}
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SNDERR("Unexpected field %s", id);
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return -EINVAL;
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}
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if (card < 0)
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return -EINVAL;
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return snd_timer_hw_open(timer, name, dev_class, dev_sclass, card, device, subdevice, mode);
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}
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