[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 int32_t hwcaps[] = {
	SR_CONF_SAMPLERATE,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
};

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, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		devc = sdi->priv;
		*data = g_variant_new_uint64(devc->cur_samplerate);
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

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

	devc = sdi->priv;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		alsa_set_samplerate(sdi, g_variant_get_uint64(data));
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	default:
		sr_err("Unknown capability: %d.", id);
		return SR_ERR;
	}

	return SR_OK;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	GVariant *gvar;
	GVariantBuilder gvb;
	int i;

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	case SR_CONF_SAMPLERATE:
		if (!sdi || !sdi->priv)
			return SR_ERR_ARG;
		devc = sdi->priv;
		if (!devc->samplerates) {
			sr_err("Instance did not contain a samplerate list.");
			return SR_ERR_ARG;
		}
		for (i = 0; devc->samplerates[i]; i++)
			;
		g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
		gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
				devc->samplerates, i, sizeof(uint64_t));
		g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
		*data = g_variant_builder_end(&gvb);
		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 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. */
	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);

	/* 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
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
	5	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
	6	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
	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
	23	#include <stdlib.h>
	24	#include <unistd.h>
	25	#include <string.h>
	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28	#include "protocol.h"
	29
	30	static const int32_t hwcaps[] = {
	31	SR_CONF_SAMPLERATE,
	32	SR_CONF_LIMIT_SAMPLES,
	33	SR_CONF_CONTINUOUS,
	34	};
	35
	36	SR_PRIV struct sr_dev_driver alsa_driver_info;
	37	static struct sr_dev_driver *di = &alsa_driver_info;
	38
	39	static int clear_instances(void)
	40	{
	41	struct drv_context *drvc;
	42
	43	if (!(drvc = di->priv))
	44	return SR_OK;
	45
	46	g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
	47	drvc->instances = NULL;
	48
	49	return SR_OK;
	50	}
	51
	52	static int hw_init(struct sr_context *sr_ctx)
	53	{
	54	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
	55	}
	56
	57	static GSList hw_scan(GSList options)
	58	{
	59	return alsa_scan(options, di);
	60	}
	61
	62	static GSList *hw_dev_list(void)
	63	{
	64	return ((struct drv_context *)(di->priv))->instances;
	65	}
	66
	67	static int hw_dev_open(struct sr_dev_inst *sdi)
	68	{
	69	struct dev_context *devc;
	70	int ret;
	71
	72	devc = sdi->priv;
	73
	74	if (!(devc->hwdev)) {
	75	sr_err("devc->hwdev was NULL.");
	76	return SR_ERR_BUG;
	77	}
	78
	79	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	80	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
	81	SND_PCM_STREAM_CAPTURE, 0);
	82	if (ret < 0) {
	83	sr_err("Can't open audio device: %s.", snd_strerror(ret));
	84	return SR_ERR;
	85	}
	86
	87	sr_dbg("Initializing hardware parameter structure.");
	88	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
	89	if (ret < 0) {
	90	sr_err("Can't initialize hardware parameter structure: %s.",
	91	snd_strerror(ret));
	92	return SR_ERR;
	93	}
	94
	95	return SR_OK;
	96	}
	97
	98	static int hw_dev_close(struct sr_dev_inst *sdi)
	99	{
	100	int ret;
	101	struct dev_context *devc;
	102
	103	devc = sdi->priv;
	104
	105	if (devc->capture_handle) {
	106	sr_dbg("Closing PCM device.");
	107	if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
	108	sr_err("Failed to close device: %s.",
	109	snd_strerror(ret));
	110	devc->capture_handle = NULL;
	111	}
	112	} else {
	113	sr_dbg("No capture handle, no need to close audio device.");
	114	}
	115
	116	return SR_OK;
	117	}
	118
	119	static int hw_cleanup(void)
	120	{
	121	clear_instances();
	122
	123	return SR_OK;
	124	}
	125
	126	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	127	{
	128	struct dev_context *devc;
	129
	130	switch (id) {
	131	case SR_CONF_SAMPLERATE:
	132	devc = sdi->priv;
	133	*data = g_variant_new_uint64(devc->cur_samplerate);
	134	break;
	135	default:
	136	return SR_ERR_ARG;
	137	}
	138
	139	return SR_OK;
	140	}
	141
	142	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
	143	{
	144	struct dev_context *devc;
	145
	146	devc = sdi->priv;
	147
	148	switch (id) {
	149	case SR_CONF_SAMPLERATE:
	150	alsa_set_samplerate(sdi, g_variant_get_uint64(data));
	151	break;
	152	case SR_CONF_LIMIT_SAMPLES:
	153	devc->limit_samples = g_variant_get_uint64(data);
	154	break;
	155	default:
	156	sr_err("Unknown capability: %d.", id);
	157	return SR_ERR;
	158	}
	159
	160	return SR_OK;
	161	}
	162
	163	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
	164	{
	165	struct dev_context *devc;
	166	GVariant *gvar;
	167	GVariantBuilder gvb;
	168	int i;
	169
	170	(void)sdi;
	171
	172	switch (key) {
	173	case SR_CONF_DEVICE_OPTIONS:
	174	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	175	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
	176	break;
	177	case SR_CONF_SAMPLERATE:
	178	if (!sdi \|\| !sdi->priv)
	179	return SR_ERR_ARG;
	180	devc = sdi->priv;
	181	if (!devc->samplerates) {
	182	sr_err("Instance did not contain a samplerate list.");
	183	return SR_ERR_ARG;
	184	}
	185	for (i = 0; devc->samplerates[i]; i++)
	186	;
	187	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	188	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	189	devc->samplerates, i, sizeof(uint64_t));
	190	g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
	191	*data = g_variant_builder_end(&gvb);
	192	break;
	193	default:
	194	return SR_ERR_ARG;
	195	}
	196
	197	return SR_OK;
	198	}
	199
	200	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	201	void *cb_data)
	202	{
	203	struct dev_context *devc;
	204	int count, ret;
	205	char *endianness;
	206
	207	devc = sdi->priv;
	208	devc->cb_data = cb_data;
	209	devc->num_samples = 0;
	210
	211	sr_dbg("Setting audio access type to RW/interleaved.");
	212	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	213	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
	214	if (ret < 0) {
	215	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
	216	return SR_ERR;
	217	}
	218
	219	/* FIXME: Hardcoded for 16bits. */
	220	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
	221	endianness = "little endian";
	222	else
	223	endianness = "big endian";
	224	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
	225	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
	226	devc->hw_params,
	227	SND_PCM_FORMAT_S16);
	228	if (ret < 0) {
	229	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
	230	return SR_ERR;
	231	}
	232
	233	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
	234	devc->cur_samplerate);
	235	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
	236	(unsigned int)devc->cur_samplerate, 0);
	237	if (ret < 0) {
	238	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
	239	return SR_ERR;
	240	}
	241
	242	sr_dbg("Setting audio channel count to %d.", devc->num_probes);
	243	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
	244	devc->hw_params, devc->num_probes);
	245	if (ret < 0) {
	246	sr_err("Can't set channel count: %s.", snd_strerror(ret));
	247	return SR_ERR;
	248	}
	249
	250	sr_dbg("Setting audio parameters.");
	251	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
	252	if (ret < 0) {
	253	sr_err("Can't set parameters: %s.", snd_strerror(ret));
	254	return SR_ERR;
	255	}
	256
	257	sr_dbg("Preparing audio interface for use.");
	258	ret = snd_pcm_prepare(devc->capture_handle);
	259	if (ret < 0) {
	260	sr_err("Can't prepare audio interface for use: %s.",
	261	snd_strerror(ret));
	262	return SR_ERR;
	263	}
	264
	265	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
	266	if (count < 1) {
	267	sr_err("Unable to obtain poll descriptors count.");
	268	return SR_ERR;
	269	}
	270
	271	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
	272	sr_err("Failed to malloc ufds.");
	273	return SR_ERR_MALLOC;
	274	}
	275
	276	sr_spew("Getting %d poll descriptors.", count);
	277	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
	278	if (ret < 0) {
	279	sr_err("Unable to obtain poll descriptors: %s.",
	280	snd_strerror(ret));
	281	g_free(devc->ufds);
	282	return SR_ERR;
	283	}
	284
	285	/* Send header packet to the session bus. */
	286	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
	287
	288	/* Poll every 10ms, or whenever some data comes in. */
	289	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
	290	alsa_receive_data, (void *)sdi);
	291
	292	// g_free(devc->ufds); /* FIXME */
	293
	294	return SR_OK;
	295	}
	296
	297	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	298	{
	299	struct sr_datafeed_packet packet;
	300	struct dev_context *devc;
	301
	302	devc = sdi->priv;
	303	devc->cb_data = cb_data;
	304
	305	sr_source_remove(devc->ufds[0].fd);
	306
	307	/* Send end packet to the session bus. */
	308	sr_dbg("Sending SR_DF_END packet.");
	309	packet.type = SR_DF_END;
	310	sr_session_send(cb_data, &packet);
	311
	312	return SR_OK;
	313	}
	314
	315	SR_PRIV struct sr_dev_driver alsa_driver_info = {
	316	.name = "alsa",
	317	.longname = "ALSA driver",
	318	.api_version = 1,
	319	.init = hw_init,
	320	.cleanup = hw_cleanup,
	321	.scan = hw_scan,
	322	.dev_list = hw_dev_list,
	323	.dev_clear = clear_instances,
	324	.config_get = config_get,
	325	.config_set = config_set,
	326	.config_list = config_list,
	327	.dev_open = hw_dev_open,
	328	.dev_close = hw_dev_close,
	329	.dev_acquisition_start = hw_dev_acquisition_start,
	330	.dev_acquisition_stop = hw_dev_acquisition_stop,
	331	.priv = NULL,
	332	};