[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	43	static const char *probe_names[] = {
78693401	44	"Channel 0", "Channel 1",
464d12c7 KS	45	NULL,
	46	};
	47
0254651d UH	48	SR_PRIV struct sr_dev_driver alsa_driver_info;
0254651d UH	49	static struct sr_dev_driver *di = &alsa_driver_info;
6ed4f044	50
0254651d UH	51	static int clear_instances(void)
	52	{
	53	/* TODO */
	54
	55	return SR_OK;
	56	}
	57
34f06b90	58	static int hw_init(struct sr_context *sr_ctx)
6ed4f044	59	{
0254651d	60	struct drv_context *drvc;
6ed4f044	61
0254651d UH	62	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
0254651d UH	63	sr_err("Driver context malloc failed.");
886a52b6	64	return SR_ERR_MALLOC;
92b3101c	65	}
6ed4f044	66
0254651d UH	67	drvc->sr_ctx = sr_ctx;
	68	di->priv = drvc;
	69
	70	return SR_OK;
	71	}
	72
	73	static GSList hw_scan(GSList options)
	74	{
	75	struct drv_context *drvc;
	76	struct dev_context *devc;
	77	struct sr_dev_inst *sdi;
	78	struct sr_probe *probe;
	79	GSList *devices;
	80	int i;
	81
	82	(void)options;
	83
	84	drvc = di->priv;
	85	drvc->instances = NULL;
	86
	87	devices = NULL;
	88
	89	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	90	sr_err("Device context malloc failed.");
	91	return NULL;
	92	}
	93
ea9cfed7	94	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) {
0254651d UH	95	sr_err("Failed to create device instance.");
0254651d UH	96	return NULL;
ea9cfed7	97	}
6ed4f044	98
0254651d UH	99	/* Set the samplerate to a default value for now. */
0254651d UH	100	devc->cur_samplerate = DEFAULT_SAMPLERATE;
9cd9f6b7	101	devc->num_probes = DEFAULT_PROBES;
0254651d UH	102
	103	sdi->priv = devc;
	104	sdi->driver = di;
6ed4f044	105
0254651d UH	106	for (i = 0; probe_names[i]; i++) {
	107	if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
	108	probe_names[i]))) {
	109	sr_err("Failed to create probe.");
	110	return NULL;
	111	}
	112	sdi->probes = g_slist_append(sdi->probes, probe);
	113	}
6ed4f044	114
0254651d UH	115	drvc->instances = g_slist_append(drvc->instances, sdi);
0254651d UH	116	devices = g_slist_append(devices, sdi);
ffedd0bf	117
0254651d	118	return devices;
6ed4f044 DR	119	}
6ed4f044 DR	120
0254651d	121	static GSList *hw_dev_list(void)
6ed4f044	122	{
0254651d UH	123	struct drv_context *drvc;
	124
	125	drvc = di->priv;
	126
	127	return drvc->instances;
	128	}
	129
	130	static int hw_dev_open(struct sr_dev_inst *sdi)
	131	{
	132	struct dev_context *devc;
ebc34738	133	int ret;
6ed4f044	134
0254651d	135	devc = sdi->priv;
6ed4f044	136
0254651d UH	137	sr_dbg("Opening audio device '%s' for stream capture.", AUDIO_DEV);
0254651d UH	138	ret = snd_pcm_open(&devc->capture_handle, AUDIO_DEV,
ea9cfed7	139	SND_PCM_STREAM_CAPTURE, 0);
ebc34738	140	if (ret < 0) {
0254651d	141	sr_err("Can't open audio device: %s.", snd_strerror(ret));
e46b8fb1	142	return SR_ERR;
6ed4f044 DR	143	}
6ed4f044 DR	144
0254651d UH	145	sr_dbg("Allocating hardware parameter structure.");
0254651d UH	146	ret = snd_pcm_hw_params_malloc(&devc->hw_params);
ebc34738	147	if (ret < 0) {
0254651d	148	sr_err("Can't allocate hardware parameter structure: %s.",
ebc34738	149	snd_strerror(ret));
886a52b6	150	return SR_ERR_MALLOC;
6ed4f044 DR	151	}
6ed4f044 DR	152
0254651d UH	153	sr_dbg("Initializing hardware parameter structure.");
0254651d UH	154	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
ebc34738	155	if (ret < 0) {
0254651d	156	sr_err("Can't initialize hardware parameter structure: %s.",
472bbb46	157	snd_strerror(ret));
e46b8fb1	158	return SR_ERR;
6ed4f044 DR	159	}
6ed4f044 DR	160
e46b8fb1	161	return SR_OK;
6ed4f044 DR	162	}
6ed4f044 DR	163
0254651d	164	static int hw_dev_close(struct sr_dev_inst *sdi)
6ed4f044	165	{
0254651d UH	166	int ret;
0254651d UH	167	struct dev_context *devc;
6ed4f044	168
0254651d UH	169	devc = sdi->priv;
	170
	171	sr_dbg("Closing device.");
6ed4f044	172
0254651d UH	173	if (devc->hw_params) {
	174	sr_dbg("Freeing hardware parameters.");
	175	snd_pcm_hw_params_free(devc->hw_params);
	176	} else {
	177	sr_dbg("No hardware parameters, no need to free.");
697785d1 UH	178	}
697785d1 UH	179
0254651d UH	180	if (devc->capture_handle) {
	181	sr_dbg("Closing PCM device.");
	182	if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
	183	sr_err("Failed to close device: %s.",
	184	snd_strerror(ret));
	185	}
	186	} else {
	187	sr_dbg("No capture handle, no need to close audio device.");
	188	}
697785d1 UH	189
697785d1 UH	190	return SR_OK;
6ed4f044 DR	191	}
6ed4f044 DR	192
57ab7d9f	193	static int hw_cleanup(void)
6ed4f044	194	{
0254651d	195	clear_instances();
57ab7d9f UH	196
57ab7d9f UH	197	return SR_OK;
6ed4f044 DR	198	}
6ed4f044 DR	199
0254651d UH	200	static int hw_info_get(int info_id, const void **data,
0254651d UH	201	const struct sr_dev_inst *sdi)
6ed4f044	202	{
0254651d	203	struct dev_context *devc;
6ed4f044	204
0254651d UH	205	if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
0254651d UH	206	devc = sdi->priv;
6ed4f044	207
0254651d UH	208	switch (info_id) {
	209	case SR_DI_HWCAPS:
	210	*data = hwcaps;
6ed4f044	211	break;
5a2326a7	212	case SR_DI_NUM_PROBES:
9cd9f6b7	213	*data = GINT_TO_POINTER(DEFAULT_PROBES);
6ed4f044	214	break;
464d12c7	215	case SR_DI_PROBE_NAMES:
0254651d	216	*data = probe_names;
464d12c7	217	break;
5a2326a7	218	case SR_DI_CUR_SAMPLERATE:
0254651d	219	*data = &devc->cur_samplerate;
6ed4f044	220	break;
0254651d UH	221	default:
	222	sr_err("Invalid info_id: %d.", info_id);
	223	return SR_ERR_ARG;
6ed4f044 DR	224	}
6ed4f044 DR	225
0254651d	226	return SR_OK;
6ed4f044 DR	227	}
6ed4f044 DR	228
0254651d UH	229	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
0254651d UH	230	const void *value)
6ed4f044	231	{
0254651d	232	struct dev_context *devc;
6ed4f044	233
0254651d	234	devc = sdi->priv;
6ed4f044	235
ffedd0bf	236	switch (hwcap) {
5a2326a7	237	case SR_HWCAP_SAMPLERATE:
0254651d UH	238	devc->cur_samplerate = (const uint64_t )value;
0254651d UH	239	break;
5a2326a7	240	case SR_HWCAP_LIMIT_SAMPLES:
0254651d UH	241	devc->limit_samples = (const uint64_t )value;
0254651d UH	242	break;
6ed4f044	243	default:
0254651d	244	sr_err("Unknown capability: %d.", hwcap);
e46b8fb1	245	return SR_ERR;
6ed4f044	246	}
0254651d UH	247
0254651d UH	248	return SR_OK;
6ed4f044 DR	249	}
6ed4f044 DR	250
0254651d UH	251	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
0254651d UH	252	void *cb_data)
6ed4f044	253	{
b9c735a2 UH	254	struct sr_datafeed_packet packet;
b9c735a2 UH	255	struct sr_datafeed_header header;
0254651d UH	256	struct sr_datafeed_meta_analog meta;
	257	struct dev_context *devc;
	258	int count, ret;
6ed4f044	259
0254651d UH	260	devc = sdi->priv;
0254651d UH	261	devc->cb_data = cb_data;
6ed4f044	262
0254651d UH	263	sr_dbg("Setting audio access type to RW/interleaved.");
	264	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	265	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
ebc34738	266	if (ret < 0) {
0254651d	267	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
e46b8fb1	268	return SR_ERR;
6ed4f044 DR	269	}
6ed4f044 DR	270
0254651d UH	271	/* FIXME: Hardcoded for 16bits. */
	272	sr_dbg("Setting audio sample format to signed 16bit (little endian).");
	273	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
	274	devc->hw_params, SND_PCM_FORMAT_S16_LE);
ebc34738	275	if (ret < 0) {
0254651d	276	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
e46b8fb1	277	return SR_ERR;
6ed4f044 DR	278	}
6ed4f044 DR	279
0254651d UH	280	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
	281	devc->cur_samplerate);
	282	ret = snd_pcm_hw_params_set_rate_near(devc->capture_handle,
	283	devc->hw_params, (unsigned int *)&devc->cur_samplerate, 0);
ebc34738	284	if (ret < 0) {
0254651d	285	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
e46b8fb1	286	return SR_ERR;
6ed4f044 DR	287	}
6ed4f044 DR	288
9cd9f6b7	289	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
0254651d	290	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
9cd9f6b7	291	devc->hw_params, devc->num_probes);
ebc34738	292	if (ret < 0) {
0254651d	293	sr_err("Can't set channel count: %s.", snd_strerror(ret));
e46b8fb1	294	return SR_ERR;
6ed4f044 DR	295	}
6ed4f044 DR	296
0254651d UH	297	sr_dbg("Setting audio parameters.");
0254651d UH	298	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
ebc34738	299	if (ret < 0) {
0254651d	300	sr_err("Can't set parameters: %s.", snd_strerror(ret));
e46b8fb1	301	return SR_ERR;
6ed4f044 DR	302	}
6ed4f044 DR	303
0254651d UH	304	sr_dbg("Preparing audio interface for use.");
0254651d UH	305	ret = snd_pcm_prepare(devc->capture_handle);
ebc34738	306	if (ret < 0) {
0254651d	307	sr_err("Can't prepare audio interface for use: %s.",
ebc34738	308	snd_strerror(ret));
e46b8fb1	309	return SR_ERR;
6ed4f044 DR	310	}
6ed4f044 DR	311
0254651d	312	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
6ed4f044	313	if (count < 1) {
472bbb46	314	sr_err("Unable to obtain poll descriptors count.");
e46b8fb1	315	return SR_ERR;
6ed4f044	316	}
0254651d	317	sr_spew("Obtained poll descriptor count: %d.", count);
6ed4f044	318
0254651d UH	319	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
0254651d UH	320	sr_err("Failed to malloc ufds.");
e46b8fb1	321	return SR_ERR_MALLOC;
92b3101c	322	}
6ed4f044	323
0254651d UH	324	sr_err("Getting %d poll descriptors.", count);
0254651d UH	325	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
ebc34738	326	if (ret < 0) {
0254651d	327	sr_err("Unable to obtain poll descriptors: %s.",
ebc34738	328	snd_strerror(ret));
0254651d	329	g_free(devc->ufds);
e46b8fb1	330	return SR_ERR;
6ed4f044 DR	331	}
6ed4f044 DR	332
0254651d UH	333	/* Send header packet to the session bus. */
0254651d UH	334	sr_dbg("Sending SR_DF_HEADER packet.");
5a2326a7	335	packet.type = SR_DF_HEADER;
0254651d	336	packet.payload = (uint8_t *)&header;
6ed4f044 DR	337	header.feed_version = 1;
6ed4f044 DR	338	gettimeofday(&header.starttime, NULL);
0254651d UH	339	sr_session_send(devc->cb_data, &packet);
	340
	341	/* Send metadata about the SR_DF_ANALOG packets to come. */
	342	sr_dbg("Sending SR_DF_META_ANALOG packet.");
	343	packet.type = SR_DF_META_ANALOG;
	344	packet.payload = &meta;
9cd9f6b7	345	meta.num_probes = devc->num_probes;
0254651d UH	346	sr_session_send(devc->cb_data, &packet);
	347
	348	/* Poll every 10ms, or whenever some data comes in. */
	349	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
9cd9f6b7	350	alsa_receive_data, (void *)sdi);
0254651d UH	351
0254651d UH	352	// g_free(devc->ufds); /* FIXME */
6ed4f044	353
e46b8fb1	354	return SR_OK;
6ed4f044 DR	355	}
6ed4f044 DR	356
0254651d	357	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
6ed4f044	358	{
0254651d UH	359	struct sr_datafeed_packet packet;
	360	struct dev_context *devc;
	361
	362	devc = sdi->priv;
	363	devc->cb_data = cb_data;
	364
	365	sr_source_remove(devc->ufds[0].fd);
	366
	367	/* Send end packet to the session bus. */
	368	sr_dbg("Sending SR_DF_END packet.");
	369	packet.type = SR_DF_END;
	370	sr_session_send(cb_data, &packet);
3010f21c UH	371
3010f21c UH	372	return SR_OK;
6ed4f044 DR	373	}
6ed4f044 DR	374
c09f0b57	375	SR_PRIV struct sr_dev_driver alsa_driver_info = {
e519ba86 UH	376	.name = "alsa",
	377	.longname = "ALSA driver",
	378	.api_version = 1,
	379	.init = hw_init,
	380	.cleanup = hw_cleanup,
0254651d UH	381	.scan = hw_scan,
	382	.dev_list = hw_dev_list,
	383	.dev_clear = clear_instances,
e7eb703f UH	384	.dev_open = hw_dev_open,
e7eb703f UH	385	.dev_close = hw_dev_close,
0254651d	386	.info_get = hw_info_get,
a9a245b4	387	.dev_config_set = hw_dev_config_set,
69040b7c UH	388	.dev_acquisition_start = hw_dev_acquisition_start,
69040b7c UH	389	.dev_acquisition_stop = hw_dev_acquisition_stop,
0254651d	390	.priv = NULL,
6ed4f044	391	};