/*

 *  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

#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 snd_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;

#ifdef F_SETSIG

	if (fcntl(fd, F_SETSIG, (long)sig) < 0) {

		SYSERR("F_SETSIG failed");

		return -errno;

	}

#endif

	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 snd_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 (_snd_conf_generic_id(id))

			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);