[libsigrok.git] / hardware / alsa / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

static const int hwcaps[] = {
	SR_CONF_SAMPLERATE,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
	0,
};

SR_PRIV struct sr_dev_driver alsa_driver_info;
static struct sr_dev_driver *di = &alsa_driver_info;

static int clear_instances(void)
{
	struct drv_context *drvc;

	if (!(drvc = di->priv))
		return SR_OK;

	g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
	drvc->instances = NULL;

	return SR_OK;
}

static int hw_init(struct sr_context *sr_ctx)
{
	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
}

static GSList *hw_scan(GSList *options)
{
	return alsa_scan(options, di);
}

static GSList *hw_dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;

	devc = sdi->priv;

	if (!(devc->hwdev)) {
		sr_err("devc->hwdev was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
			   SND_PCM_STREAM_CAPTURE, 0);
	if (ret < 0) {
		sr_err("Can't open audio device: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Initializing hardware parameter structure.");
	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
	if (ret < 0) {
		sr_err("Can't initialize hardware parameter structure: %s.",
		       snd_strerror(ret));
		return SR_ERR;
	}

	return SR_OK;
}

static int hw_dev_close(struct sr_dev_inst *sdi)
{
	int ret;
	struct dev_context *devc;

	devc = sdi->priv;

	if (devc->capture_handle) {
		sr_dbg("Closing PCM device.");
		if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
			sr_err("Failed to close device: %s.",
			       snd_strerror(ret));
			devc->capture_handle = NULL;
		}
	} else {
		sr_dbg("No capture handle, no need to close audio device.");
	}

	return SR_OK;
}

static int hw_cleanup(void)
{
	clear_instances();

	return SR_OK;
}

static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		devc = sdi->priv;
		*data = &devc->cur_samplerate;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	devc = sdi->priv;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		alsa_set_samplerate(sdi, *(const uint64_t *)value);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		break;
	default:
		sr_err("Unknown capability: %d.", id);
		return SR_ERR;
	}

	return SR_OK;
}

static int config_list(int key, const void **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = hwcaps;
		break;
	case SR_CONF_SAMPLERATE:
		if (!sdi || !sdi->priv)
			return SR_ERR_ARG;
		devc = sdi->priv;
		if (!devc->supp_rates.list) {
			sr_err("Instance did not contain a samplerate list.");
			return SR_ERR_ARG;
		}
		*data = &devc->supp_rates;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
				    void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct dev_context *devc;
	int count, ret;
	char *endianness;

	devc = sdi->priv;
	devc->cb_data = cb_data;
	devc->num_samples = 0;

	sr_dbg("Setting audio access type to RW/interleaved.");
	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
			devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
	if (ret < 0) {
		sr_err("Can't set audio access type: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	/* FIXME: Hardcoded for 16bits. */
	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
		endianness = "little endian";
	else
		endianness = "big endian";
	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
					   devc->hw_params,
					   SND_PCM_FORMAT_S16);
	if (ret < 0) {
		sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
	       devc->cur_samplerate);
	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
					 (unsigned int)devc->cur_samplerate, 0);
	if (ret < 0) {
		sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
					     devc->hw_params, devc->num_probes);
	if (ret < 0) {
		sr_err("Can't set channel count: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Setting audio parameters.");
	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
	if (ret < 0) {
		sr_err("Can't set parameters: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Preparing audio interface for use.");
	ret = snd_pcm_prepare(devc->capture_handle);
	if (ret < 0) {
		sr_err("Can't prepare audio interface for use: %s.",
		       snd_strerror(ret));
		return SR_ERR;
	}

	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
	if (count < 1) {
		sr_err("Unable to obtain poll descriptors count.");
		return SR_ERR;
	}

	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
		sr_err("Failed to malloc ufds.");
		return SR_ERR_MALLOC;
	}

	sr_spew("Getting %d poll descriptors.", count);
	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
	if (ret < 0) {
		sr_err("Unable to obtain poll descriptors: %s.",
		       snd_strerror(ret));
		g_free(devc->ufds);
		return SR_ERR;
	}

	/* Send header packet to the session bus. */
	sr_dbg("Sending SR_DF_HEADER packet.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(devc->cb_data, &packet);

	/* Poll every 10ms, or whenever some data comes in. */
	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
		      alsa_receive_data, (void *)sdi);

	// g_free(devc->ufds); /* FIXME */

	return SR_OK;
}

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

	devc = sdi->priv;
	devc->cb_data = cb_data;

	sr_source_remove(devc->ufds[0].fd);

	/* Send end packet to the session bus. */
	sr_dbg("Sending SR_DF_END packet.");
	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver alsa_driver_info = {
	.name = "alsa",
	.longname = "ALSA driver",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
6ed4f044	1	/*
6944b2d0	2	* This file is part of the libsigrok project.
6ed4f044 DR	3	*
6ed4f044 DR	4	* Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
0254651d	5	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
6944b2d0	6	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
6ed4f044 DR	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
9cd9f6b7 AG	23	#include <stdlib.h>
	24	#include <unistd.h>
	25	#include <string.h>
721ecf3d UH	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28	#include "protocol.h"
472bbb46	29
915f7cc8	30	static const int hwcaps[] = {
1953564a BV	31	SR_CONF_SAMPLERATE,
	32	SR_CONF_LIMIT_SAMPLES,
	33	SR_CONF_CONTINUOUS,
0254651d	34	0,
6ed4f044 DR	35	};
6ed4f044 DR	36
0254651d UH	37	SR_PRIV struct sr_dev_driver alsa_driver_info;
0254651d UH	38	static struct sr_dev_driver *di = &alsa_driver_info;
6ed4f044	39
0254651d UH	40	static int clear_instances(void)
0254651d UH	41	{
6944b2d0 AG	42	struct drv_context *drvc;
	43
	44	if (!(drvc = di->priv))
	45	return SR_OK;
	46
	47	g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
	48	drvc->instances = NULL;
0254651d UH	49
	50	return SR_OK;
	51	}
	52
34f06b90	53	static int hw_init(struct sr_context *sr_ctx)
6ed4f044	54	{
063e7aef	55	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
0254651d UH	56	}
	57
	58	static GSList hw_scan(GSList options)
	59	{
6944b2d0	60	return alsa_scan(options, di);
6ed4f044 DR	61	}
6ed4f044 DR	62
0254651d	63	static GSList *hw_dev_list(void)
6ed4f044	64	{
0e94d524	65	return ((struct drv_context *)(di->priv))->instances;
0254651d UH	66	}
	67
	68	static int hw_dev_open(struct sr_dev_inst *sdi)
	69	{
	70	struct dev_context *devc;
ebc34738	71	int ret;
6ed4f044	72
0254651d	73	devc = sdi->priv;
6ed4f044	74
6944b2d0 AG	75	if (!(devc->hwdev)) {
	76	sr_err("devc->hwdev was NULL.");
	77	return SR_ERR_BUG;
	78	}
	79
	80	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	81	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
ea9cfed7	82	SND_PCM_STREAM_CAPTURE, 0);
ebc34738	83	if (ret < 0) {
0254651d	84	sr_err("Can't open audio device: %s.", snd_strerror(ret));
e46b8fb1	85	return SR_ERR;
6ed4f044 DR	86	}
6ed4f044 DR	87
0254651d UH	88	sr_dbg("Initializing hardware parameter structure.");
0254651d UH	89	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
ebc34738	90	if (ret < 0) {
0254651d	91	sr_err("Can't initialize hardware parameter structure: %s.",
472bbb46	92	snd_strerror(ret));
e46b8fb1	93	return SR_ERR;
6ed4f044 DR	94	}
6ed4f044 DR	95
e46b8fb1	96	return SR_OK;
6ed4f044 DR	97	}
6ed4f044 DR	98
0254651d	99	static int hw_dev_close(struct sr_dev_inst *sdi)
6ed4f044	100	{
0254651d UH	101	int ret;
0254651d UH	102	struct dev_context *devc;
6ed4f044	103
0254651d UH	104	devc = sdi->priv;
0254651d UH	105
0254651d UH	106	if (devc->capture_handle) {
	107	sr_dbg("Closing PCM device.");
	108	if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
	109	sr_err("Failed to close device: %s.",
	110	snd_strerror(ret));
6944b2d0	111	devc->capture_handle = NULL;
0254651d UH	112	}
	113	} else {
	114	sr_dbg("No capture handle, no need to close audio device.");
	115	}
697785d1 UH	116
697785d1 UH	117	return SR_OK;
6ed4f044 DR	118	}
6ed4f044 DR	119
57ab7d9f	120	static int hw_cleanup(void)
6ed4f044	121	{
0254651d	122	clear_instances();
57ab7d9f UH	123
57ab7d9f UH	124	return SR_OK;
6ed4f044 DR	125	}
6ed4f044 DR	126
035a1078	127	static int config_get(int id, const void *data, const struct sr_dev_inst sdi)
6ed4f044	128	{
0254651d	129	struct dev_context *devc;
6ed4f044	130
035a1078	131	switch (id) {
123e1313	132	case SR_CONF_SAMPLERATE:
9a6517d1	133	devc = sdi->priv;
0254651d	134	*data = &devc->cur_samplerate;
6ed4f044	135	break;
0254651d	136	default:
0254651d	137	return SR_ERR_ARG;
6ed4f044 DR	138	}
6ed4f044 DR	139
0254651d	140	return SR_OK;
6ed4f044 DR	141	}
6ed4f044 DR	142
035a1078	143	static int config_set(int id, const void value, const struct sr_dev_inst sdi)
6ed4f044	144	{
0254651d	145	struct dev_context *devc;
6ed4f044	146
0254651d	147	devc = sdi->priv;
6ed4f044	148
035a1078	149	switch (id) {
1953564a	150	case SR_CONF_SAMPLERATE:
65faa197	151	alsa_set_samplerate(sdi, (const uint64_t )value);
0254651d	152	break;
1953564a	153	case SR_CONF_LIMIT_SAMPLES:
0254651d UH	154	devc->limit_samples = (const uint64_t )value;
0254651d UH	155	break;
6ed4f044	156	default:
035a1078	157	sr_err("Unknown capability: %d.", id);
e46b8fb1	158	return SR_ERR;
6ed4f044	159	}
0254651d UH	160
0254651d UH	161	return SR_OK;
6ed4f044 DR	162	}
6ed4f044 DR	163
a1c743fc BV	164	static int config_list(int key, const void *data, const struct sr_dev_inst sdi)
	165	{
	166	struct dev_context *devc;
	167
	168	(void)sdi;
	169
	170	switch (key) {
9a6517d1 BV	171	case SR_CONF_DEVICE_OPTIONS:
	172	*data = hwcaps;
	173	break;
a1c743fc BV	174	case SR_CONF_SAMPLERATE:
	175	if (!sdi \|\| !sdi->priv)
	176	return SR_ERR_ARG;
	177	devc = sdi->priv;
	178	if (!devc->supp_rates.list) {
	179	sr_err("Instance did not contain a samplerate list.");
	180	return SR_ERR_ARG;
	181	}
	182	*data = &devc->supp_rates;
	183	break;
	184	default:
	185	return SR_ERR_ARG;
	186	}
	187
	188	return SR_OK;
	189	}
	190
0254651d UH	191	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
0254651d UH	192	void *cb_data)
6ed4f044	193	{
b9c735a2 UH	194	struct sr_datafeed_packet packet;
b9c735a2 UH	195	struct sr_datafeed_header header;
0254651d UH	196	struct dev_context *devc;
0254651d UH	197	int count, ret;
721ecf3d	198	char *endianness;
6ed4f044	199
0254651d UH	200	devc = sdi->priv;
0254651d UH	201	devc->cb_data = cb_data;
729850c9	202	devc->num_samples = 0;
6ed4f044	203
0254651d UH	204	sr_dbg("Setting audio access type to RW/interleaved.");
	205	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	206	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
ebc34738	207	if (ret < 0) {
0254651d	208	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
e46b8fb1	209	return SR_ERR;
6ed4f044 DR	210	}
6ed4f044 DR	211
0254651d	212	/* FIXME: Hardcoded for 16bits. */
729850c9	213	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
721ecf3d	214	endianness = "little endian";
729850c9	215	else
721ecf3d UH	216	endianness = "big endian";
721ecf3d UH	217	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
0254651d	218	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
729850c9 AG	219	devc->hw_params,
729850c9 AG	220	SND_PCM_FORMAT_S16);
ebc34738	221	if (ret < 0) {
0254651d	222	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
e46b8fb1	223	return SR_ERR;
6ed4f044 DR	224	}
6ed4f044 DR	225
0254651d UH	226	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
0254651d UH	227	devc->cur_samplerate);
0d6ff103 AG	228	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
0d6ff103 AG	229	(unsigned int)devc->cur_samplerate, 0);
ebc34738	230	if (ret < 0) {
0254651d	231	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
e46b8fb1	232	return SR_ERR;
6ed4f044 DR	233	}
6ed4f044 DR	234
9cd9f6b7	235	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
0254651d	236	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
9cd9f6b7	237	devc->hw_params, devc->num_probes);
ebc34738	238	if (ret < 0) {
0254651d	239	sr_err("Can't set channel count: %s.", snd_strerror(ret));
e46b8fb1	240	return SR_ERR;
6ed4f044 DR	241	}
6ed4f044 DR	242
0254651d UH	243	sr_dbg("Setting audio parameters.");
0254651d UH	244	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
ebc34738	245	if (ret < 0) {
0254651d	246	sr_err("Can't set parameters: %s.", snd_strerror(ret));
e46b8fb1	247	return SR_ERR;
6ed4f044 DR	248	}
6ed4f044 DR	249
0254651d UH	250	sr_dbg("Preparing audio interface for use.");
0254651d UH	251	ret = snd_pcm_prepare(devc->capture_handle);
ebc34738	252	if (ret < 0) {
0254651d	253	sr_err("Can't prepare audio interface for use: %s.",
ebc34738	254	snd_strerror(ret));
e46b8fb1	255	return SR_ERR;
6ed4f044 DR	256	}
6ed4f044 DR	257
0254651d	258	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
6ed4f044	259	if (count < 1) {
472bbb46	260	sr_err("Unable to obtain poll descriptors count.");
e46b8fb1	261	return SR_ERR;
6ed4f044 DR	262	}
6ed4f044 DR	263
0254651d UH	264	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
0254651d UH	265	sr_err("Failed to malloc ufds.");
e46b8fb1	266	return SR_ERR_MALLOC;
92b3101c	267	}
6ed4f044	268
3d6de074	269	sr_spew("Getting %d poll descriptors.", count);
0254651d	270	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
ebc34738	271	if (ret < 0) {
0254651d	272	sr_err("Unable to obtain poll descriptors: %s.",
ebc34738	273	snd_strerror(ret));
0254651d	274	g_free(devc->ufds);
e46b8fb1	275	return SR_ERR;
6ed4f044 DR	276	}
6ed4f044 DR	277
0254651d UH	278	/* Send header packet to the session bus. */
0254651d UH	279	sr_dbg("Sending SR_DF_HEADER packet.");
5a2326a7	280	packet.type = SR_DF_HEADER;
0254651d	281	packet.payload = (uint8_t *)&header;
6ed4f044 DR	282	header.feed_version = 1;
6ed4f044 DR	283	gettimeofday(&header.starttime, NULL);
0254651d UH	284	sr_session_send(devc->cb_data, &packet);
0254651d UH	285
0254651d UH	286	/* Poll every 10ms, or whenever some data comes in. */
0254651d UH	287	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
9cd9f6b7	288	alsa_receive_data, (void *)sdi);
0254651d UH	289
0254651d UH	290	// g_free(devc->ufds); /* FIXME */
6ed4f044	291
e46b8fb1	292	return SR_OK;
6ed4f044 DR	293	}
6ed4f044 DR	294
0254651d	295	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
6ed4f044	296	{
0254651d UH	297	struct sr_datafeed_packet packet;
	298	struct dev_context *devc;
	299
	300	devc = sdi->priv;
	301	devc->cb_data = cb_data;
	302
	303	sr_source_remove(devc->ufds[0].fd);
	304
	305	/* Send end packet to the session bus. */
	306	sr_dbg("Sending SR_DF_END packet.");
	307	packet.type = SR_DF_END;
	308	sr_session_send(cb_data, &packet);
3010f21c UH	309
3010f21c UH	310	return SR_OK;
6ed4f044 DR	311	}
6ed4f044 DR	312
c09f0b57	313	SR_PRIV struct sr_dev_driver alsa_driver_info = {
e519ba86 UH	314	.name = "alsa",
	315	.longname = "ALSA driver",
	316	.api_version = 1,
	317	.init = hw_init,
	318	.cleanup = hw_cleanup,
0254651d UH	319	.scan = hw_scan,
	320	.dev_list = hw_dev_list,
	321	.dev_clear = clear_instances,
035a1078 BV	322	.config_get = config_get,
035a1078 BV	323	.config_set = config_set,
a1c743fc	324	.config_list = config_list,
e7eb703f UH	325	.dev_open = hw_dev_open,
e7eb703f UH	326	.dev_close = hw_dev_close,
69040b7c UH	327	.dev_acquisition_start = hw_dev_acquisition_start,
69040b7c UH	328	.dev_acquisition_stop = hw_dev_acquisition_stop,
0254651d	329	.priv = NULL,
6ed4f044	330	};