[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_HWCAP_SAMPLERATE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_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)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}

	drvc->sr_ctx = sr_ctx;
	di->priv = drvc;

	return SR_OK;
}

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

static GSList *hw_dev_list(void)
{
	struct drv_context *drvc;

	drvc = di->priv;

	return drvc->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;

	sr_dbg("Closing device.");

	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 hw_info_get(int info_id, const void **data,
		       const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
		devc = sdi->priv;

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_CUR_SAMPLERATE:
		*data = &devc->cur_samplerate;
		break;
	case SR_DI_SAMPLERATES:
		if (!devc->supp_rates.list) {
			sr_err("Instance did not contain a samplerate list.");
			return SR_ERR_ARG;
		}
		*data = &devc->supp_rates;
		break;
	default:
		sr_err("Invalid info_id: %d.", info_id);
		return SR_ERR_ARG;
	}

	return SR_OK;
}

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

	devc = sdi->priv;

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

	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 sr_datafeed_meta_analog meta;
	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_err("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);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	sr_dbg("Sending SR_DF_META_ANALOG packet.");
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = devc->num_probes;
	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,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.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[] = {
5a2326a7 UH	31	SR_HWCAP_SAMPLERATE,
	32	SR_HWCAP_LIMIT_SAMPLES,
	33	SR_HWCAP_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	{
0254651d	55	struct drv_context *drvc;
6ed4f044	56
0254651d UH	57	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
0254651d UH	58	sr_err("Driver context malloc failed.");
886a52b6	59	return SR_ERR_MALLOC;
92b3101c	60	}
6ed4f044	61
0254651d UH	62	drvc->sr_ctx = sr_ctx;
	63	di->priv = drvc;
	64
	65	return SR_OK;
	66	}
	67
	68	static GSList hw_scan(GSList options)
	69	{
6944b2d0	70	return alsa_scan(options, di);
6ed4f044 DR	71	}
6ed4f044 DR	72
0254651d	73	static GSList *hw_dev_list(void)
6ed4f044	74	{
0254651d UH	75	struct drv_context *drvc;
	76
	77	drvc = di->priv;
	78
	79	return drvc->instances;
	80	}
	81
	82	static int hw_dev_open(struct sr_dev_inst *sdi)
	83	{
	84	struct dev_context *devc;
ebc34738	85	int ret;
6ed4f044	86
0254651d	87	devc = sdi->priv;
6ed4f044	88
6944b2d0 AG	89	if (!(devc->hwdev)) {
	90	sr_err("devc->hwdev was NULL.");
	91	return SR_ERR_BUG;
	92	}
	93
	94	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	95	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
ea9cfed7	96	SND_PCM_STREAM_CAPTURE, 0);
ebc34738	97	if (ret < 0) {
0254651d	98	sr_err("Can't open audio device: %s.", snd_strerror(ret));
e46b8fb1	99	return SR_ERR;
6ed4f044 DR	100	}
6ed4f044 DR	101
0254651d UH	102	sr_dbg("Initializing hardware parameter structure.");
0254651d UH	103	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
ebc34738	104	if (ret < 0) {
0254651d	105	sr_err("Can't initialize hardware parameter structure: %s.",
472bbb46	106	snd_strerror(ret));
e46b8fb1	107	return SR_ERR;
6ed4f044 DR	108	}
6ed4f044 DR	109
e46b8fb1	110	return SR_OK;
6ed4f044 DR	111	}
6ed4f044 DR	112
0254651d	113	static int hw_dev_close(struct sr_dev_inst *sdi)
6ed4f044	114	{
0254651d UH	115	int ret;
0254651d UH	116	struct dev_context *devc;
6ed4f044	117
0254651d UH	118	devc = sdi->priv;
	119
	120	sr_dbg("Closing device.");
6ed4f044	121
0254651d UH	122	if (devc->capture_handle) {
	123	sr_dbg("Closing PCM device.");
	124	if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
	125	sr_err("Failed to close device: %s.",
	126	snd_strerror(ret));
6944b2d0	127	devc->capture_handle = NULL;
0254651d UH	128	}
	129	} else {
	130	sr_dbg("No capture handle, no need to close audio device.");
	131	}
697785d1 UH	132
697785d1 UH	133	return SR_OK;
6ed4f044 DR	134	}
6ed4f044 DR	135
57ab7d9f	136	static int hw_cleanup(void)
6ed4f044	137	{
0254651d	138	clear_instances();
57ab7d9f UH	139
57ab7d9f UH	140	return SR_OK;
6ed4f044 DR	141	}
6ed4f044 DR	142
0254651d UH	143	static int hw_info_get(int info_id, const void **data,
0254651d UH	144	const struct sr_dev_inst *sdi)
6ed4f044	145	{
0254651d	146	struct dev_context *devc;
6ed4f044	147
0254651d UH	148	if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
0254651d UH	149	devc = sdi->priv;
6ed4f044	150
0254651d UH	151	switch (info_id) {
	152	case SR_DI_HWCAPS:
	153	*data = hwcaps;
6ed4f044	154	break;
5a2326a7	155	case SR_DI_CUR_SAMPLERATE:
0254651d	156	*data = &devc->cur_samplerate;
6ed4f044	157	break;
65faa197 AG	158	case SR_DI_SAMPLERATES:
65faa197 AG	159	if (!devc->supp_rates.list) {
721ecf3d	160	sr_err("Instance did not contain a samplerate list.");
65faa197 AG	161	return SR_ERR_ARG;
	162	}
	163	*data = &devc->supp_rates;
	164	break;
0254651d UH	165	default:
	166	sr_err("Invalid info_id: %d.", info_id);
	167	return SR_ERR_ARG;
6ed4f044 DR	168	}
6ed4f044 DR	169
0254651d	170	return SR_OK;
6ed4f044 DR	171	}
6ed4f044 DR	172
0254651d UH	173	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
0254651d UH	174	const void *value)
6ed4f044	175	{
0254651d	176	struct dev_context *devc;
6ed4f044	177
0254651d	178	devc = sdi->priv;
6ed4f044	179
ffedd0bf	180	switch (hwcap) {
5a2326a7	181	case SR_HWCAP_SAMPLERATE:
65faa197	182	alsa_set_samplerate(sdi, (const uint64_t )value);
0254651d	183	break;
5a2326a7	184	case SR_HWCAP_LIMIT_SAMPLES:
0254651d UH	185	devc->limit_samples = (const uint64_t )value;
0254651d UH	186	break;
6ed4f044	187	default:
0254651d	188	sr_err("Unknown capability: %d.", hwcap);
e46b8fb1	189	return SR_ERR;
6ed4f044	190	}
0254651d UH	191
0254651d UH	192	return SR_OK;
6ed4f044 DR	193	}
6ed4f044 DR	194
0254651d UH	195	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
0254651d UH	196	void *cb_data)
6ed4f044	197	{
b9c735a2 UH	198	struct sr_datafeed_packet packet;
b9c735a2 UH	199	struct sr_datafeed_header header;
0254651d UH	200	struct sr_datafeed_meta_analog meta;
	201	struct dev_context *devc;
	202	int count, ret;
721ecf3d	203	char *endianness;
6ed4f044	204
0254651d UH	205	devc = sdi->priv;
0254651d UH	206	devc->cb_data = cb_data;
729850c9	207	devc->num_samples = 0;
6ed4f044	208
0254651d UH	209	sr_dbg("Setting audio access type to RW/interleaved.");
	210	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	211	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
ebc34738	212	if (ret < 0) {
0254651d	213	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
e46b8fb1	214	return SR_ERR;
6ed4f044 DR	215	}
6ed4f044 DR	216
0254651d	217	/* FIXME: Hardcoded for 16bits. */
729850c9	218	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
721ecf3d	219	endianness = "little endian";
729850c9	220	else
721ecf3d UH	221	endianness = "big endian";
721ecf3d UH	222	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
0254651d	223	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
729850c9 AG	224	devc->hw_params,
729850c9 AG	225	SND_PCM_FORMAT_S16);
ebc34738	226	if (ret < 0) {
0254651d	227	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
e46b8fb1	228	return SR_ERR;
6ed4f044 DR	229	}
6ed4f044 DR	230
0254651d UH	231	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
0254651d UH	232	devc->cur_samplerate);
0d6ff103 AG	233	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
0d6ff103 AG	234	(unsigned int)devc->cur_samplerate, 0);
ebc34738	235	if (ret < 0) {
0254651d	236	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
e46b8fb1	237	return SR_ERR;
6ed4f044 DR	238	}
6ed4f044 DR	239
9cd9f6b7	240	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
0254651d	241	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
9cd9f6b7	242	devc->hw_params, devc->num_probes);
ebc34738	243	if (ret < 0) {
0254651d	244	sr_err("Can't set channel count: %s.", snd_strerror(ret));
e46b8fb1	245	return SR_ERR;
6ed4f044 DR	246	}
6ed4f044 DR	247
0254651d UH	248	sr_dbg("Setting audio parameters.");
0254651d UH	249	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
ebc34738	250	if (ret < 0) {
0254651d	251	sr_err("Can't set parameters: %s.", snd_strerror(ret));
e46b8fb1	252	return SR_ERR;
6ed4f044 DR	253	}
6ed4f044 DR	254
0254651d UH	255	sr_dbg("Preparing audio interface for use.");
0254651d UH	256	ret = snd_pcm_prepare(devc->capture_handle);
ebc34738	257	if (ret < 0) {
0254651d	258	sr_err("Can't prepare audio interface for use: %s.",
ebc34738	259	snd_strerror(ret));
e46b8fb1	260	return SR_ERR;
6ed4f044 DR	261	}
6ed4f044 DR	262
0254651d	263	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
6ed4f044	264	if (count < 1) {
472bbb46	265	sr_err("Unable to obtain poll descriptors count.");
e46b8fb1	266	return SR_ERR;
6ed4f044 DR	267	}
6ed4f044 DR	268
0254651d UH	269	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
0254651d UH	270	sr_err("Failed to malloc ufds.");
e46b8fb1	271	return SR_ERR_MALLOC;
92b3101c	272	}
6ed4f044	273
0254651d UH	274	sr_err("Getting %d poll descriptors.", count);
0254651d UH	275	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
ebc34738	276	if (ret < 0) {
0254651d	277	sr_err("Unable to obtain poll descriptors: %s.",
ebc34738	278	snd_strerror(ret));
0254651d	279	g_free(devc->ufds);
e46b8fb1	280	return SR_ERR;
6ed4f044 DR	281	}
6ed4f044 DR	282
0254651d UH	283	/* Send header packet to the session bus. */
0254651d UH	284	sr_dbg("Sending SR_DF_HEADER packet.");
5a2326a7	285	packet.type = SR_DF_HEADER;
0254651d	286	packet.payload = (uint8_t *)&header;
6ed4f044 DR	287	header.feed_version = 1;
6ed4f044 DR	288	gettimeofday(&header.starttime, NULL);
0254651d UH	289	sr_session_send(devc->cb_data, &packet);
	290
	291	/* Send metadata about the SR_DF_ANALOG packets to come. */
	292	sr_dbg("Sending SR_DF_META_ANALOG packet.");
	293	packet.type = SR_DF_META_ANALOG;
	294	packet.payload = &meta;
9cd9f6b7	295	meta.num_probes = devc->num_probes;
0254651d UH	296	sr_session_send(devc->cb_data, &packet);
	297
	298	/* Poll every 10ms, or whenever some data comes in. */
	299	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
9cd9f6b7	300	alsa_receive_data, (void *)sdi);
0254651d UH	301
0254651d UH	302	// g_free(devc->ufds); /* FIXME */
6ed4f044	303
e46b8fb1	304	return SR_OK;
6ed4f044 DR	305	}
6ed4f044 DR	306
0254651d	307	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
6ed4f044	308	{
0254651d UH	309	struct sr_datafeed_packet packet;
	310	struct dev_context *devc;
	311
	312	devc = sdi->priv;
	313	devc->cb_data = cb_data;
	314
	315	sr_source_remove(devc->ufds[0].fd);
	316
	317	/* Send end packet to the session bus. */
	318	sr_dbg("Sending SR_DF_END packet.");
	319	packet.type = SR_DF_END;
	320	sr_session_send(cb_data, &packet);
3010f21c UH	321
3010f21c UH	322	return SR_OK;
6ed4f044 DR	323	}
6ed4f044 DR	324
c09f0b57	325	SR_PRIV struct sr_dev_driver alsa_driver_info = {
e519ba86 UH	326	.name = "alsa",
	327	.longname = "ALSA driver",
	328	.api_version = 1,
	329	.init = hw_init,
	330	.cleanup = hw_cleanup,
0254651d UH	331	.scan = hw_scan,
	332	.dev_list = hw_dev_list,
	333	.dev_clear = clear_instances,
e7eb703f UH	334	.dev_open = hw_dev_open,
e7eb703f UH	335	.dev_close = hw_dev_close,
0254651d	336	.info_get = hw_info_get,
a9a245b4	337	.dev_config_set = hw_dev_config_set,
69040b7c UH	338	.dev_acquisition_start = hw_dev_acquisition_start,
69040b7c UH	339	.dev_acquisition_stop = hw_dev_acquisition_stop,
0254651d	340	.priv = NULL,
6ed4f044	341	};