| /* |
| * Timer Interface - main file |
| * Copyright (c) 1998-2001 by Jaroslav Kysela <perex@perex.cz> |
| * |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as |
| * published by the Free Software Foundation; either version 2.1 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include "timer_local.h" |
| |
| #ifndef PIC |
| /* entry for static linking */ |
| const char *_snd_module_timer_hw = ""; |
| #endif |
| |
| #define SNDRV_FILE_TIMER ALSA_DEVICE_DIRECTORY "timer" |
| #define SNDRV_TIMER_VERSION_MAX SNDRV_PROTOCOL_VERSION(2, 0, 5) |
| |
| #define SNDRV_TIMER_IOCTL_STATUS_OLD _IOW('T', 0x14, struct sndrv_timer_status) |
| |
| enum { |
| SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), |
| SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), |
| SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), |
| SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), |
| }; |
| |
| static int snd_timer_hw_close(snd_timer_t *handle) |
| { |
| snd_timer_t *tmr = handle; |
| int res; |
| |
| if (!tmr) |
| return -EINVAL; |
| res = close(tmr->poll_fd) < 0 ? -errno : 0; |
| return res; |
| } |
| |
| static int snd_timer_hw_nonblock(snd_timer_t *timer, int nonblock) |
| { |
| long flags; |
| assert(timer); |
| if ((flags = fcntl(timer->poll_fd, F_GETFL)) < 0) |
| return -errno; |
| if (nonblock) |
| flags |= O_NONBLOCK; |
| else |
| flags &= ~O_NONBLOCK; |
| if (fcntl(timer->poll_fd, F_SETFL, flags) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static int snd_timer_hw_async(snd_timer_t *timer, int sig, pid_t pid) |
| { |
| long flags; |
| int fd; |
| |
| assert(timer); |
| fd = timer->poll_fd; |
| if ((flags = fcntl(fd, F_GETFL)) < 0) { |
| SYSERR("F_GETFL failed"); |
| return -errno; |
| } |
| if (sig >= 0) |
| flags |= O_ASYNC; |
| else |
| flags &= ~O_ASYNC; |
| if (fcntl(fd, F_SETFL, flags) < 0) { |
| SYSERR("F_SETFL for O_ASYNC failed"); |
| return -errno; |
| } |
| if (sig < 0) |
| return 0; |
| if (fcntl(fd, F_SETSIG, (long)sig) < 0) { |
| SYSERR("F_SETSIG failed"); |
| return -errno; |
| } |
| if (fcntl(fd, F_SETOWN, (long)pid) < 0) { |
| SYSERR("F_SETOWN failed"); |
| return -errno; |
| } |
| return 0; |
| } |
| |
| static int snd_timer_hw_info(snd_timer_t *handle, snd_timer_info_t * info) |
| { |
| snd_timer_t *tmr; |
| |
| tmr = handle; |
| if (!tmr || !info) |
| return -EINVAL; |
| if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_INFO, info) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static int snd_timer_hw_params(snd_timer_t *handle, snd_timer_params_t * params) |
| { |
| snd_timer_t *tmr; |
| |
| tmr = handle; |
| if (!tmr || !params) |
| return -EINVAL; |
| if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_PARAMS, params) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static int snd_timer_hw_status(snd_timer_t *handle, snd_timer_status_t * status) |
| { |
| snd_timer_t *tmr; |
| int cmd; |
| |
| tmr = handle; |
| if (!tmr || !status) |
| return -EINVAL; |
| if (tmr->version < SNDRV_PROTOCOL_VERSION(2, 0, 1)) |
| cmd = SNDRV_TIMER_IOCTL_STATUS_OLD; |
| else |
| cmd = SNDRV_TIMER_IOCTL_STATUS; |
| if (ioctl(tmr->poll_fd, cmd, status) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static int snd_timer_hw_start(snd_timer_t *handle) |
| { |
| snd_timer_t *tmr; |
| unsigned int cmd; |
| |
| tmr = handle; |
| if (!tmr) |
| return -EINVAL; |
| if (tmr->version < SNDRV_PROTOCOL_VERSION(2, 0, 4)) |
| cmd = SNDRV_TIMER_IOCTL_START_OLD; |
| else |
| cmd = SNDRV_TIMER_IOCTL_START; |
| if (ioctl(tmr->poll_fd, cmd) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static int snd_timer_hw_stop(snd_timer_t *handle) |
| { |
| snd_timer_t *tmr; |
| unsigned int cmd; |
| |
| tmr = handle; |
| if (!tmr) |
| return -EINVAL; |
| if (tmr->version < SNDRV_PROTOCOL_VERSION(2, 0, 4)) |
| cmd = SNDRV_TIMER_IOCTL_STOP_OLD; |
| else |
| cmd = SNDRV_TIMER_IOCTL_STOP; |
| if (ioctl(tmr->poll_fd, cmd) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static int snd_timer_hw_continue(snd_timer_t *handle) |
| { |
| snd_timer_t *tmr; |
| unsigned int cmd; |
| |
| tmr = handle; |
| if (!tmr) |
| return -EINVAL; |
| if (tmr->version < SNDRV_PROTOCOL_VERSION(2, 0, 4)) |
| cmd = SNDRV_TIMER_IOCTL_CONTINUE_OLD; |
| else |
| cmd = SNDRV_TIMER_IOCTL_CONTINUE; |
| if (ioctl(tmr->poll_fd, cmd) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| static ssize_t snd_timer_hw_read(snd_timer_t *handle, void *buffer, size_t size) |
| { |
| snd_timer_t *tmr; |
| ssize_t result; |
| |
| tmr = handle; |
| if (!tmr || (!buffer && size > 0)) |
| return -EINVAL; |
| result = read(tmr->poll_fd, buffer, size); |
| if (result < 0) |
| return -errno; |
| return result; |
| } |
| |
| static const snd_timer_ops_t snd_timer_hw_ops = { |
| .close = snd_timer_hw_close, |
| .nonblock = snd_timer_hw_nonblock, |
| .async = snd_timer_hw_async, |
| .info = snd_timer_hw_info, |
| .params = snd_timer_hw_params, |
| .status = snd_timer_hw_status, |
| .rt_start = snd_timer_hw_start, |
| .rt_stop = snd_timer_hw_stop, |
| .rt_continue = snd_timer_hw_continue, |
| .read = snd_timer_hw_read, |
| }; |
| |
| 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) |
| { |
| int fd, ver, tmode, ret; |
| snd_timer_t *tmr; |
| struct sndrv_timer_select sel; |
| |
| *handle = NULL; |
| |
| tmode = O_RDONLY; |
| if (mode & SND_TIMER_OPEN_NONBLOCK) |
| tmode |= O_NONBLOCK; |
| fd = snd_open_device(SNDRV_FILE_TIMER, tmode); |
| if (fd < 0) |
| return -errno; |
| if (ioctl(fd, SNDRV_TIMER_IOCTL_PVERSION, &ver) < 0) { |
| ret = -errno; |
| close(fd); |
| return ret; |
| } |
| if (SNDRV_PROTOCOL_INCOMPATIBLE(ver, SNDRV_TIMER_VERSION_MAX)) { |
| close(fd); |
| return -SND_ERROR_INCOMPATIBLE_VERSION; |
| } |
| if (mode & SND_TIMER_OPEN_TREAD) { |
| int arg = 1; |
| if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 3)) { |
| ret = -ENOTTY; |
| goto __no_tread; |
| } |
| if (ioctl(fd, SNDRV_TIMER_IOCTL_TREAD, &arg) < 0) { |
| ret = -errno; |
| __no_tread: |
| close(fd); |
| SNDMSG("extended read is not supported (SNDRV_TIMER_IOCTL_TREAD)"); |
| return ret; |
| } |
| } |
| memset(&sel, 0, sizeof(sel)); |
| sel.id.dev_class = dev_class; |
| sel.id.dev_sclass = dev_sclass; |
| sel.id.card = card; |
| sel.id.device = device; |
| sel.id.subdevice = subdevice; |
| if (ioctl(fd, SNDRV_TIMER_IOCTL_SELECT, &sel) < 0) { |
| ret = -errno; |
| close(fd); |
| return ret; |
| } |
| tmr = (snd_timer_t *) calloc(1, sizeof(snd_timer_t)); |
| if (tmr == NULL) { |
| close(fd); |
| return -ENOMEM; |
| } |
| tmr->type = SND_TIMER_TYPE_HW; |
| tmr->version = ver; |
| tmr->mode = tmode; |
| tmr->name = strdup(name); |
| tmr->poll_fd = fd; |
| tmr->ops = &snd_timer_hw_ops; |
| INIT_LIST_HEAD(&tmr->async_handlers); |
| *handle = tmr; |
| return 0; |
| } |
| |
| int _snd_timer_hw_open(snd_timer_t **timer, char *name, |
| snd_config_t *root ATTRIBUTE_UNUSED, |
| snd_config_t *conf, int mode) |
| { |
| snd_config_iterator_t i, next; |
| long dev_class = SND_TIMER_CLASS_GLOBAL, dev_sclass = SND_TIMER_SCLASS_NONE; |
| long card = 0, device = 0, subdevice = 0; |
| const char *str; |
| int err; |
| snd_config_for_each(i, next, conf) { |
| snd_config_t *n = snd_config_iterator_entry(i); |
| const char *id; |
| if (snd_config_get_id(n, &id) < 0) |
| continue; |
| if (strcmp(id, "comment") == 0) |
| continue; |
| if (strcmp(id, "type") == 0) |
| continue; |
| if (strcmp(id, "class") == 0) { |
| err = snd_config_get_integer(n, &dev_class); |
| if (err < 0) |
| return err; |
| continue; |
| } |
| if (strcmp(id, "sclass") == 0) { |
| err = snd_config_get_integer(n, &dev_sclass); |
| if (err < 0) |
| return err; |
| continue; |
| } |
| if (strcmp(id, "card") == 0) { |
| err = snd_config_get_integer(n, &card); |
| if (err < 0) { |
| err = snd_config_get_string(n, &str); |
| if (err < 0) |
| return -EINVAL; |
| card = snd_card_get_index(str); |
| if (card < 0) |
| return card; |
| } |
| continue; |
| } |
| if (strcmp(id, "device") == 0) { |
| err = snd_config_get_integer(n, &device); |
| if (err < 0) |
| return err; |
| continue; |
| } |
| if (strcmp(id, "subdevice") == 0) { |
| err = snd_config_get_integer(n, &subdevice); |
| if (err < 0) |
| return err; |
| continue; |
| } |
| SNDERR("Unexpected field %s", id); |
| return -EINVAL; |
| } |
| if (card < 0) |
| return -EINVAL; |
| return snd_timer_hw_open(timer, name, dev_class, dev_sclass, card, device, subdevice, mode); |
| } |
| SND_DLSYM_BUILD_VERSION(_snd_timer_hw_open, SND_TIMER_DLSYM_VERSION); |