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

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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
// #define AUDIO_DEV		"plughw:0,0"
#define AUDIO_DEV		"default"

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)
{
	/* TODO */

	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)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_probe *probe;
	GSList *devices;
	int i;

	(void)options;

	drvc = di->priv;
	drvc->instances = NULL;

	devices = NULL;

	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
		sr_err("Device context malloc failed.");
		return NULL;
	}

	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) {
		sr_err("Failed to create device instance.");
		return NULL;
	}

	/* Set the samplerate to a default value for now. */
	devc->cur_samplerate = DEFAULT_SAMPLERATE;
	devc->num_probes = DEFAULT_PROBES;

	sdi->priv = devc;
	sdi->driver = di;

	for (i = 0; probe_names[i]; i++) {
		if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
					   probe_names[i]))) {
			sr_err("Failed to create probe.");
			return NULL;
		}
		sdi->probes = g_slist_append(sdi->probes, probe);
	}

	drvc->instances = g_slist_append(drvc->instances, sdi);
	devices = g_slist_append(devices, sdi);

	return devices;
}

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;

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

	sr_dbg("Allocating hardware parameter structure.");
	ret = snd_pcm_hw_params_malloc(&devc->hw_params);
	if (ret < 0) {
		sr_err("Can't allocate hardware parameter structure: %s.",
		       snd_strerror(ret));
		return SR_ERR_MALLOC;
	}

	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->hw_params) {
		sr_dbg("Freeing hardware parameters.");
		snd_pcm_hw_params_free(devc->hw_params);
	} else {
		sr_dbg("No hardware parameters, no need to free.");
	}

	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));
		}
	} 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 = GINT_TO_POINTER(DEFAULT_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;

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

	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. */
	sr_dbg("Setting audio sample format to signed 16bit (little endian).");
	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
			devc->hw_params, SND_PCM_FORMAT_S16_LE);
	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_near(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 DR	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
0254651d	5	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
6ed4f044 DR	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
9cd9f6b7	22	#include "protocol.h"
45c59c8b BV	23	#include "libsigrok.h"
45c59c8b BV	24	#include "libsigrok-internal.h"
6ed4f044	25
9cd9f6b7 AG	26	#include <stdlib.h>
	27	#include <unistd.h>
	28	#include <string.h>
472bbb46	29
9cd9f6b7	30	#define DEFAULT_PROBES 2
0254651d UH	31	#define SAMPLE_WIDTH 16
	32	#define DEFAULT_SAMPLERATE 44100
	33	// #define AUDIO_DEV "plughw:0,0"
	34	#define AUDIO_DEV "default"
a4cfb10f	35
915f7cc8	36	static const int hwcaps[] = {
5a2326a7 UH	37	SR_HWCAP_SAMPLERATE,
	38	SR_HWCAP_LIMIT_SAMPLES,
	39	SR_HWCAP_CONTINUOUS,
0254651d	40	0,
6ed4f044 DR	41	};
6ed4f044 DR	42
0254651d UH	43	static const char *probe_names[] = {
	44	"Channel 0",
	45	"Channel 1",
464d12c7 KS	46	NULL,
	47	};
	48
0254651d UH	49	SR_PRIV struct sr_dev_driver alsa_driver_info;
0254651d UH	50	static struct sr_dev_driver *di = &alsa_driver_info;
6ed4f044	51
0254651d UH	52	static int clear_instances(void)
	53	{
	54	/* TODO */
	55
	56	return SR_OK;
	57	}
	58
34f06b90	59	static int hw_init(struct sr_context *sr_ctx)
6ed4f044	60	{
0254651d	61	struct drv_context *drvc;
6ed4f044	62
0254651d UH	63	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
0254651d UH	64	sr_err("Driver context malloc failed.");
886a52b6	65	return SR_ERR_MALLOC;
92b3101c	66	}
6ed4f044	67
0254651d UH	68	drvc->sr_ctx = sr_ctx;
	69	di->priv = drvc;
	70
	71	return SR_OK;
	72	}
	73
	74	static GSList hw_scan(GSList options)
	75	{
	76	struct drv_context *drvc;
	77	struct dev_context *devc;
	78	struct sr_dev_inst *sdi;
	79	struct sr_probe *probe;
	80	GSList *devices;
	81	int i;
	82
	83	(void)options;
	84
	85	drvc = di->priv;
	86	drvc->instances = NULL;
	87
	88	devices = NULL;
	89
	90	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	91	sr_err("Device context malloc failed.");
	92	return NULL;
	93	}
	94
ea9cfed7	95	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) {
0254651d UH	96	sr_err("Failed to create device instance.");
0254651d UH	97	return NULL;
ea9cfed7	98	}
6ed4f044	99
0254651d UH	100	/* Set the samplerate to a default value for now. */
0254651d UH	101	devc->cur_samplerate = DEFAULT_SAMPLERATE;
9cd9f6b7	102	devc->num_probes = DEFAULT_PROBES;
0254651d UH	103
	104	sdi->priv = devc;
	105	sdi->driver = di;
6ed4f044	106
0254651d UH	107	for (i = 0; probe_names[i]; i++) {
	108	if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
	109	probe_names[i]))) {
	110	sr_err("Failed to create probe.");
	111	return NULL;
	112	}
	113	sdi->probes = g_slist_append(sdi->probes, probe);
	114	}
6ed4f044	115
0254651d UH	116	drvc->instances = g_slist_append(drvc->instances, sdi);
0254651d UH	117	devices = g_slist_append(devices, sdi);
ffedd0bf	118
0254651d	119	return devices;
6ed4f044 DR	120	}
6ed4f044 DR	121
0254651d	122	static GSList *hw_dev_list(void)
6ed4f044	123	{
0254651d UH	124	struct drv_context *drvc;
	125
	126	drvc = di->priv;
	127
	128	return drvc->instances;
	129	}
	130
	131	static int hw_dev_open(struct sr_dev_inst *sdi)
	132	{
	133	struct dev_context *devc;
ebc34738	134	int ret;
6ed4f044	135
0254651d	136	devc = sdi->priv;
6ed4f044	137
0254651d UH	138	sr_dbg("Opening audio device '%s' for stream capture.", AUDIO_DEV);
0254651d UH	139	ret = snd_pcm_open(&devc->capture_handle, AUDIO_DEV,
ea9cfed7	140	SND_PCM_STREAM_CAPTURE, 0);
ebc34738	141	if (ret < 0) {
0254651d	142	sr_err("Can't open audio device: %s.", snd_strerror(ret));
e46b8fb1	143	return SR_ERR;
6ed4f044 DR	144	}
6ed4f044 DR	145
0254651d UH	146	sr_dbg("Allocating hardware parameter structure.");
0254651d UH	147	ret = snd_pcm_hw_params_malloc(&devc->hw_params);
ebc34738	148	if (ret < 0) {
0254651d	149	sr_err("Can't allocate hardware parameter structure: %s.",
ebc34738	150	snd_strerror(ret));
886a52b6	151	return SR_ERR_MALLOC;
6ed4f044 DR	152	}
6ed4f044 DR	153
0254651d UH	154	sr_dbg("Initializing hardware parameter structure.");
0254651d UH	155	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
ebc34738	156	if (ret < 0) {
0254651d	157	sr_err("Can't initialize hardware parameter structure: %s.",
472bbb46	158	snd_strerror(ret));
e46b8fb1	159	return SR_ERR;
6ed4f044 DR	160	}
6ed4f044 DR	161
e46b8fb1	162	return SR_OK;
6ed4f044 DR	163	}
6ed4f044 DR	164
0254651d	165	static int hw_dev_close(struct sr_dev_inst *sdi)
6ed4f044	166	{
0254651d UH	167	int ret;
0254651d UH	168	struct dev_context *devc;
6ed4f044	169
0254651d UH	170	devc = sdi->priv;
	171
	172	sr_dbg("Closing device.");
6ed4f044	173
0254651d UH	174	if (devc->hw_params) {
	175	sr_dbg("Freeing hardware parameters.");
	176	snd_pcm_hw_params_free(devc->hw_params);
	177	} else {
	178	sr_dbg("No hardware parameters, no need to free.");
697785d1 UH	179	}
697785d1 UH	180
0254651d UH	181	if (devc->capture_handle) {
	182	sr_dbg("Closing PCM device.");
	183	if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
	184	sr_err("Failed to close device: %s.",
	185	snd_strerror(ret));
	186	}
	187	} else {
	188	sr_dbg("No capture handle, no need to close audio device.");
	189	}
697785d1 UH	190
697785d1 UH	191	return SR_OK;
6ed4f044 DR	192	}
6ed4f044 DR	193
57ab7d9f	194	static int hw_cleanup(void)
6ed4f044	195	{
0254651d	196	clear_instances();
57ab7d9f UH	197
57ab7d9f UH	198	return SR_OK;
6ed4f044 DR	199	}
6ed4f044 DR	200
0254651d UH	201	static int hw_info_get(int info_id, const void **data,
0254651d UH	202	const struct sr_dev_inst *sdi)
6ed4f044	203	{
0254651d	204	struct dev_context *devc;
6ed4f044	205
0254651d UH	206	if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
0254651d UH	207	devc = sdi->priv;
6ed4f044	208
0254651d UH	209	switch (info_id) {
	210	case SR_DI_HWCAPS:
	211	*data = hwcaps;
6ed4f044	212	break;
5a2326a7	213	case SR_DI_NUM_PROBES:
9cd9f6b7	214	*data = GINT_TO_POINTER(DEFAULT_PROBES);
6ed4f044	215	break;
464d12c7	216	case SR_DI_PROBE_NAMES:
0254651d	217	*data = probe_names;
464d12c7	218	break;
5a2326a7	219	case SR_DI_CUR_SAMPLERATE:
0254651d	220	*data = &devc->cur_samplerate;
6ed4f044	221	break;
0254651d UH	222	default:
	223	sr_err("Invalid info_id: %d.", info_id);
	224	return SR_ERR_ARG;
6ed4f044 DR	225	}
6ed4f044 DR	226
0254651d	227	return SR_OK;
6ed4f044 DR	228	}
6ed4f044 DR	229
0254651d UH	230	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
0254651d UH	231	const void *value)
6ed4f044	232	{
0254651d	233	struct dev_context *devc;
6ed4f044	234
0254651d	235	devc = sdi->priv;
6ed4f044	236
ffedd0bf	237	switch (hwcap) {
5a2326a7	238	case SR_HWCAP_SAMPLERATE:
0254651d UH	239	devc->cur_samplerate = (const uint64_t )value;
0254651d UH	240	break;
5a2326a7	241	case SR_HWCAP_LIMIT_SAMPLES:
0254651d UH	242	devc->limit_samples = (const uint64_t )value;
0254651d UH	243	break;
6ed4f044	244	default:
0254651d	245	sr_err("Unknown capability: %d.", hwcap);
e46b8fb1	246	return SR_ERR;
6ed4f044	247	}
0254651d UH	248
0254651d UH	249	return SR_OK;
6ed4f044 DR	250	}
6ed4f044 DR	251
0254651d UH	252	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
0254651d UH	253	void *cb_data)
6ed4f044	254	{
b9c735a2 UH	255	struct sr_datafeed_packet packet;
b9c735a2 UH	256	struct sr_datafeed_header header;
0254651d UH	257	struct sr_datafeed_meta_analog meta;
	258	struct dev_context *devc;
	259	int count, ret;
6ed4f044	260
0254651d UH	261	devc = sdi->priv;
0254651d UH	262	devc->cb_data = cb_data;
6ed4f044	263
0254651d UH	264	sr_dbg("Setting audio access type to RW/interleaved.");
	265	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	266	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
ebc34738	267	if (ret < 0) {
0254651d	268	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
e46b8fb1	269	return SR_ERR;
6ed4f044 DR	270	}
6ed4f044 DR	271
0254651d UH	272	/* FIXME: Hardcoded for 16bits. */
	273	sr_dbg("Setting audio sample format to signed 16bit (little endian).");
	274	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
	275	devc->hw_params, SND_PCM_FORMAT_S16_LE);
ebc34738	276	if (ret < 0) {
0254651d	277	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
e46b8fb1	278	return SR_ERR;
6ed4f044 DR	279	}
6ed4f044 DR	280
0254651d UH	281	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
	282	devc->cur_samplerate);
	283	ret = snd_pcm_hw_params_set_rate_near(devc->capture_handle,
	284	devc->hw_params, (unsigned int *)&devc->cur_samplerate, 0);
ebc34738	285	if (ret < 0) {
0254651d	286	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
e46b8fb1	287	return SR_ERR;
6ed4f044 DR	288	}
6ed4f044 DR	289
9cd9f6b7	290	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
0254651d	291	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
9cd9f6b7	292	devc->hw_params, devc->num_probes);
ebc34738	293	if (ret < 0) {
0254651d	294	sr_err("Can't set channel count: %s.", snd_strerror(ret));
e46b8fb1	295	return SR_ERR;
6ed4f044 DR	296	}
6ed4f044 DR	297
0254651d UH	298	sr_dbg("Setting audio parameters.");
0254651d UH	299	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
ebc34738	300	if (ret < 0) {
0254651d	301	sr_err("Can't set parameters: %s.", snd_strerror(ret));
e46b8fb1	302	return SR_ERR;
6ed4f044 DR	303	}
6ed4f044 DR	304
0254651d UH	305	sr_dbg("Preparing audio interface for use.");
0254651d UH	306	ret = snd_pcm_prepare(devc->capture_handle);
ebc34738	307	if (ret < 0) {
0254651d	308	sr_err("Can't prepare audio interface for use: %s.",
ebc34738	309	snd_strerror(ret));
e46b8fb1	310	return SR_ERR;
6ed4f044 DR	311	}
6ed4f044 DR	312
0254651d	313	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
6ed4f044	314	if (count < 1) {
472bbb46	315	sr_err("Unable to obtain poll descriptors count.");
e46b8fb1	316	return SR_ERR;
6ed4f044	317	}
0254651d	318	sr_spew("Obtained poll descriptor count: %d.", count);
6ed4f044	319
0254651d UH	320	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
0254651d UH	321	sr_err("Failed to malloc ufds.");
e46b8fb1	322	return SR_ERR_MALLOC;
92b3101c	323	}
6ed4f044	324
0254651d UH	325	sr_err("Getting %d poll descriptors.", count);
0254651d UH	326	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
ebc34738	327	if (ret < 0) {
0254651d	328	sr_err("Unable to obtain poll descriptors: %s.",
ebc34738	329	snd_strerror(ret));
0254651d	330	g_free(devc->ufds);
e46b8fb1	331	return SR_ERR;
6ed4f044 DR	332	}
6ed4f044 DR	333
0254651d UH	334	/* Send header packet to the session bus. */
0254651d UH	335	sr_dbg("Sending SR_DF_HEADER packet.");
5a2326a7	336	packet.type = SR_DF_HEADER;
0254651d	337	packet.payload = (uint8_t *)&header;
6ed4f044 DR	338	header.feed_version = 1;
6ed4f044 DR	339	gettimeofday(&header.starttime, NULL);
0254651d UH	340	sr_session_send(devc->cb_data, &packet);
	341
	342	/* Send metadata about the SR_DF_ANALOG packets to come. */
	343	sr_dbg("Sending SR_DF_META_ANALOG packet.");
	344	packet.type = SR_DF_META_ANALOG;
	345	packet.payload = &meta;
9cd9f6b7	346	meta.num_probes = devc->num_probes;
0254651d UH	347	sr_session_send(devc->cb_data, &packet);
	348
	349	/* Poll every 10ms, or whenever some data comes in. */
	350	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
9cd9f6b7	351	alsa_receive_data, (void *)sdi);
0254651d UH	352
0254651d UH	353	// g_free(devc->ufds); /* FIXME */
6ed4f044	354
e46b8fb1	355	return SR_OK;
6ed4f044 DR	356	}
6ed4f044 DR	357
0254651d	358	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
6ed4f044	359	{
0254651d UH	360	struct sr_datafeed_packet packet;
	361	struct dev_context *devc;
	362
	363	devc = sdi->priv;
	364	devc->cb_data = cb_data;
	365
	366	sr_source_remove(devc->ufds[0].fd);
	367
	368	/* Send end packet to the session bus. */
	369	sr_dbg("Sending SR_DF_END packet.");
	370	packet.type = SR_DF_END;
	371	sr_session_send(cb_data, &packet);
3010f21c UH	372
3010f21c UH	373	return SR_OK;
6ed4f044 DR	374	}
6ed4f044 DR	375
c09f0b57	376	SR_PRIV struct sr_dev_driver alsa_driver_info = {
e519ba86 UH	377	.name = "alsa",
	378	.longname = "ALSA driver",
	379	.api_version = 1,
	380	.init = hw_init,
	381	.cleanup = hw_cleanup,
0254651d UH	382	.scan = hw_scan,
	383	.dev_list = hw_dev_list,
	384	.dev_clear = clear_instances,
e7eb703f UH	385	.dev_open = hw_dev_open,
e7eb703f UH	386	.dev_close = hw_dev_close,
0254651d	387	.info_get = hw_info_get,
a9a245b4	388	.dev_config_set = hw_dev_config_set,
69040b7c UH	389	.dev_acquisition_start = hw_dev_acquisition_start,
69040b7c UH	390	.dev_acquisition_stop = hw_dev_acquisition_stop,
0254651d	391	.priv = NULL,
6ed4f044	392	};