[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 "protocol.h"
#include "libsigrok.h"
#include "libsigrok-internal.h"

#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define DEFAULT_PROBES		2
#define SAMPLE_WIDTH		16
#define DEFAULT_SAMPLERATE	44100

static const int hwcaps[] = {
	SR_HWCAP_SAMPLERATE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_CONTINUOUS,
	0,
};

static const char *probe_names[] = {
	"Channel 0", "Channel 1",
	NULL,
};

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_NUM_PROBES:
		*data = &devc->num_probes;
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		break;
	case SR_DI_CUR_SAMPLERATE:
		*data = &devc->cur_samplerate;
		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:
		devc->cur_samplerate = *(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 *endianess;

	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)
		endianess = "lilltle endian";
	else
		endianess = "big endian";
	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianess);
	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;
	}
	sr_spew("Obtained poll descriptor count: %d.", count);

	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	23	#include "protocol.h"
45c59c8b BV	24	#include "libsigrok.h"
45c59c8b BV	25	#include "libsigrok-internal.h"
6ed4f044	26
9cd9f6b7 AG	27	#include <stdlib.h>
	28	#include <unistd.h>
	29	#include <string.h>
472bbb46	30
9cd9f6b7	31	#define DEFAULT_PROBES 2
0254651d UH	32	#define SAMPLE_WIDTH 16
0254651d UH	33	#define DEFAULT_SAMPLERATE 44100
a4cfb10f	34
915f7cc8	35	static const int hwcaps[] = {
5a2326a7 UH	36	SR_HWCAP_SAMPLERATE,
	37	SR_HWCAP_LIMIT_SAMPLES,
	38	SR_HWCAP_CONTINUOUS,
0254651d	39	0,
6ed4f044 DR	40	};
6ed4f044 DR	41
0254651d	42	static const char *probe_names[] = {
78693401	43	"Channel 0", "Channel 1",
464d12c7 KS	44	NULL,
	45	};
	46
0254651d UH	47	SR_PRIV struct sr_dev_driver alsa_driver_info;
0254651d UH	48	static struct sr_dev_driver *di = &alsa_driver_info;
6ed4f044	49
0254651d UH	50	static int clear_instances(void)
0254651d UH	51	{
6944b2d0 AG	52	struct drv_context *drvc;
	53
	54	if (!(drvc = di->priv))
	55	return SR_OK;
	56
	57	g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
	58	drvc->instances = NULL;
0254651d UH	59
	60	return SR_OK;
	61	}
	62
34f06b90	63	static int hw_init(struct sr_context *sr_ctx)
6ed4f044	64	{
0254651d	65	struct drv_context *drvc;
6ed4f044	66
0254651d UH	67	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
0254651d UH	68	sr_err("Driver context malloc failed.");
886a52b6	69	return SR_ERR_MALLOC;
92b3101c	70	}
6ed4f044	71
0254651d UH	72	drvc->sr_ctx = sr_ctx;
	73	di->priv = drvc;
	74
	75	return SR_OK;
	76	}
	77
	78	static GSList hw_scan(GSList options)
	79	{
6944b2d0	80	return alsa_scan(options, di);
6ed4f044 DR	81	}
6ed4f044 DR	82
0254651d	83	static GSList *hw_dev_list(void)
6ed4f044	84	{
0254651d UH	85	struct drv_context *drvc;
	86
	87	drvc = di->priv;
	88
	89	return drvc->instances;
	90	}
	91
	92	static int hw_dev_open(struct sr_dev_inst *sdi)
	93	{
	94	struct dev_context *devc;
ebc34738	95	int ret;
6ed4f044	96
0254651d	97	devc = sdi->priv;
6ed4f044	98
6944b2d0 AG	99	if (!(devc->hwdev)) {
	100	sr_err("devc->hwdev was NULL.");
	101	return SR_ERR_BUG;
	102	}
	103
	104	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	105	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
ea9cfed7	106	SND_PCM_STREAM_CAPTURE, 0);
ebc34738	107	if (ret < 0) {
0254651d	108	sr_err("Can't open audio device: %s.", snd_strerror(ret));
e46b8fb1	109	return SR_ERR;
6ed4f044 DR	110	}
6ed4f044 DR	111
0254651d UH	112	sr_dbg("Initializing hardware parameter structure.");
0254651d UH	113	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
ebc34738	114	if (ret < 0) {
0254651d	115	sr_err("Can't initialize hardware parameter structure: %s.",
472bbb46	116	snd_strerror(ret));
e46b8fb1	117	return SR_ERR;
6ed4f044 DR	118	}
6ed4f044 DR	119
e46b8fb1	120	return SR_OK;
6ed4f044 DR	121	}
6ed4f044 DR	122
0254651d	123	static int hw_dev_close(struct sr_dev_inst *sdi)
6ed4f044	124	{
0254651d UH	125	int ret;
0254651d UH	126	struct dev_context *devc;
6ed4f044	127
0254651d UH	128	devc = sdi->priv;
	129
	130	sr_dbg("Closing device.");
6ed4f044	131
0254651d UH	132	if (devc->capture_handle) {
	133	sr_dbg("Closing PCM device.");
	134	if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
	135	sr_err("Failed to close device: %s.",
	136	snd_strerror(ret));
6944b2d0	137	devc->capture_handle = NULL;
0254651d UH	138	}
	139	} else {
	140	sr_dbg("No capture handle, no need to close audio device.");
	141	}
697785d1 UH	142
697785d1 UH	143	return SR_OK;
6ed4f044 DR	144	}
6ed4f044 DR	145
57ab7d9f	146	static int hw_cleanup(void)
6ed4f044	147	{
0254651d	148	clear_instances();
57ab7d9f UH	149
57ab7d9f UH	150	return SR_OK;
6ed4f044 DR	151	}
6ed4f044 DR	152
0254651d UH	153	static int hw_info_get(int info_id, const void **data,
0254651d UH	154	const struct sr_dev_inst *sdi)
6ed4f044	155	{
0254651d	156	struct dev_context *devc;
6ed4f044	157
0254651d UH	158	if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
0254651d UH	159	devc = sdi->priv;
6ed4f044	160
0254651d UH	161	switch (info_id) {
	162	case SR_DI_HWCAPS:
	163	*data = hwcaps;
6ed4f044	164	break;
5a2326a7	165	case SR_DI_NUM_PROBES:
6944b2d0	166	*data = &devc->num_probes;
6ed4f044	167	break;
464d12c7	168	case SR_DI_PROBE_NAMES:
0254651d	169	*data = probe_names;
464d12c7	170	break;
5a2326a7	171	case SR_DI_CUR_SAMPLERATE:
0254651d	172	*data = &devc->cur_samplerate;
6ed4f044	173	break;
0254651d UH	174	default:
	175	sr_err("Invalid info_id: %d.", info_id);
	176	return SR_ERR_ARG;
6ed4f044 DR	177	}
6ed4f044 DR	178
0254651d	179	return SR_OK;
6ed4f044 DR	180	}
6ed4f044 DR	181
0254651d UH	182	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
0254651d UH	183	const void *value)
6ed4f044	184	{
0254651d	185	struct dev_context *devc;
6ed4f044	186
0254651d	187	devc = sdi->priv;
6ed4f044	188
ffedd0bf	189	switch (hwcap) {
5a2326a7	190	case SR_HWCAP_SAMPLERATE:
0254651d UH	191	devc->cur_samplerate = (const uint64_t )value;
0254651d UH	192	break;
5a2326a7	193	case SR_HWCAP_LIMIT_SAMPLES:
0254651d UH	194	devc->limit_samples = (const uint64_t )value;
0254651d UH	195	break;
6ed4f044	196	default:
0254651d	197	sr_err("Unknown capability: %d.", hwcap);
e46b8fb1	198	return SR_ERR;
6ed4f044	199	}
0254651d UH	200
0254651d UH	201	return SR_OK;
6ed4f044 DR	202	}
6ed4f044 DR	203
0254651d UH	204	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
0254651d UH	205	void *cb_data)
6ed4f044	206	{
b9c735a2 UH	207	struct sr_datafeed_packet packet;
b9c735a2 UH	208	struct sr_datafeed_header header;
0254651d UH	209	struct sr_datafeed_meta_analog meta;
	210	struct dev_context *devc;
	211	int count, ret;
729850c9	212	char *endianess;
6ed4f044	213
0254651d UH	214	devc = sdi->priv;
0254651d UH	215	devc->cb_data = cb_data;
729850c9	216	devc->num_samples = 0;
6ed4f044	217
0254651d UH	218	sr_dbg("Setting audio access type to RW/interleaved.");
	219	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	220	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
ebc34738	221	if (ret < 0) {
0254651d	222	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
e46b8fb1	223	return SR_ERR;
6ed4f044 DR	224	}
6ed4f044 DR	225
0254651d	226	/* FIXME: Hardcoded for 16bits. */
729850c9 AG	227	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
	228	endianess = "lilltle endian";
	229	else
	230	endianess = "big endian";
	231	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianess);
0254651d	232	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
729850c9 AG	233	devc->hw_params,
729850c9 AG	234	SND_PCM_FORMAT_S16);
ebc34738	235	if (ret < 0) {
0254651d	236	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
e46b8fb1	237	return SR_ERR;
6ed4f044 DR	238	}
6ed4f044 DR	239
0254651d UH	240	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
0254651d UH	241	devc->cur_samplerate);
0d6ff103 AG	242	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
0d6ff103 AG	243	(unsigned int)devc->cur_samplerate, 0);
ebc34738	244	if (ret < 0) {
0254651d	245	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
e46b8fb1	246	return SR_ERR;
6ed4f044 DR	247	}
6ed4f044 DR	248
9cd9f6b7	249	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
0254651d	250	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
9cd9f6b7	251	devc->hw_params, devc->num_probes);
ebc34738	252	if (ret < 0) {
0254651d	253	sr_err("Can't set channel count: %s.", snd_strerror(ret));
e46b8fb1	254	return SR_ERR;
6ed4f044 DR	255	}
6ed4f044 DR	256
0254651d UH	257	sr_dbg("Setting audio parameters.");
0254651d UH	258	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
ebc34738	259	if (ret < 0) {
0254651d	260	sr_err("Can't set parameters: %s.", snd_strerror(ret));
e46b8fb1	261	return SR_ERR;
6ed4f044 DR	262	}
6ed4f044 DR	263
0254651d UH	264	sr_dbg("Preparing audio interface for use.");
0254651d UH	265	ret = snd_pcm_prepare(devc->capture_handle);
ebc34738	266	if (ret < 0) {
0254651d	267	sr_err("Can't prepare audio interface for use: %s.",
ebc34738	268	snd_strerror(ret));
e46b8fb1	269	return SR_ERR;
6ed4f044 DR	270	}
6ed4f044 DR	271
0254651d	272	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
6ed4f044	273	if (count < 1) {
472bbb46	274	sr_err("Unable to obtain poll descriptors count.");
e46b8fb1	275	return SR_ERR;
6ed4f044	276	}
0254651d	277	sr_spew("Obtained poll descriptor count: %d.", count);
6ed4f044	278
0254651d UH	279	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
0254651d UH	280	sr_err("Failed to malloc ufds.");
e46b8fb1	281	return SR_ERR_MALLOC;
92b3101c	282	}
6ed4f044	283
0254651d UH	284	sr_err("Getting %d poll descriptors.", count);
0254651d UH	285	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
ebc34738	286	if (ret < 0) {
0254651d	287	sr_err("Unable to obtain poll descriptors: %s.",
ebc34738	288	snd_strerror(ret));
0254651d	289	g_free(devc->ufds);
e46b8fb1	290	return SR_ERR;
6ed4f044 DR	291	}
6ed4f044 DR	292
0254651d UH	293	/* Send header packet to the session bus. */
0254651d UH	294	sr_dbg("Sending SR_DF_HEADER packet.");
5a2326a7	295	packet.type = SR_DF_HEADER;
0254651d	296	packet.payload = (uint8_t *)&header;
6ed4f044 DR	297	header.feed_version = 1;
6ed4f044 DR	298	gettimeofday(&header.starttime, NULL);
0254651d UH	299	sr_session_send(devc->cb_data, &packet);
	300
	301	/* Send metadata about the SR_DF_ANALOG packets to come. */
	302	sr_dbg("Sending SR_DF_META_ANALOG packet.");
	303	packet.type = SR_DF_META_ANALOG;
	304	packet.payload = &meta;
9cd9f6b7	305	meta.num_probes = devc->num_probes;
0254651d UH	306	sr_session_send(devc->cb_data, &packet);
	307
	308	/* Poll every 10ms, or whenever some data comes in. */
	309	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
9cd9f6b7	310	alsa_receive_data, (void *)sdi);
0254651d UH	311
0254651d UH	312	// g_free(devc->ufds); /* FIXME */
6ed4f044	313
e46b8fb1	314	return SR_OK;
6ed4f044 DR	315	}
6ed4f044 DR	316
0254651d	317	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
6ed4f044	318	{
0254651d UH	319	struct sr_datafeed_packet packet;
	320	struct dev_context *devc;
	321
	322	devc = sdi->priv;
	323	devc->cb_data = cb_data;
	324
	325	sr_source_remove(devc->ufds[0].fd);
	326
	327	/* Send end packet to the session bus. */
	328	sr_dbg("Sending SR_DF_END packet.");
	329	packet.type = SR_DF_END;
	330	sr_session_send(cb_data, &packet);
3010f21c UH	331
3010f21c UH	332	return SR_OK;
6ed4f044 DR	333	}
6ed4f044 DR	334
c09f0b57	335	SR_PRIV struct sr_dev_driver alsa_driver_info = {
e519ba86 UH	336	.name = "alsa",
	337	.longname = "ALSA driver",
	338	.api_version = 1,
	339	.init = hw_init,
	340	.cleanup = hw_cleanup,
0254651d UH	341	.scan = hw_scan,
	342	.dev_list = hw_dev_list,
	343	.dev_clear = clear_instances,
e7eb703f UH	344	.dev_open = hw_dev_open,
e7eb703f UH	345	.dev_close = hw_dev_close,
0254651d	346	.info_get = hw_info_get,
a9a245b4	347	.dev_config_set = hw_dev_config_set,
69040b7c UH	348	.dev_acquisition_start = hw_dev_acquisition_start,
69040b7c UH	349	.dev_acquisition_stop = hw_dev_acquisition_stop,
0254651d	350	.priv = NULL,
6ed4f044	351	};