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

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2011 Daniel Ribeiro <drwyrm@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 <sigrok.h>
#include <alsa/asoundlib.h>
#include "config.h"

#define NUM_PROBES 2
#define SAMPLE_WIDTH 16
#define AUDIO_DEV "plughw:0,0"

static int capabilities[] = {
	HWCAP_SAMPLERATE,
	HWCAP_LIMIT_SAMPLES,
	HWCAP_CONTINUOUS,
};

static GSList *device_instances = NULL;

struct alsa {
	uint64_t cur_rate;
	uint64_t limit_samples;
	snd_pcm_t *capture_handle;
	snd_pcm_hw_params_t *hw_params;
	gpointer session_id;
};

static int hw_init(char *deviceinfo)
{
	struct sigrok_device_instance *sdi;
	struct alsa *alsa;

	/* Avoid compiler warnings. */
	deviceinfo = deviceinfo;

	alsa = malloc(sizeof(struct alsa));
	if (!alsa)
		return 0;
	memset(alsa, 0, sizeof(struct alsa));

	sdi = sigrok_device_instance_new(0, ST_ACTIVE, "alsa", NULL, NULL);
	if (!sdi)
		goto free_alsa;

	sdi->priv = alsa;

	device_instances = g_slist_append(device_instances, sdi);

	return 1;
free_alsa:
	free(alsa);
	return 0;
}

static int hw_opendev(int device_index)
{
	struct sigrok_device_instance *sdi;
	struct alsa *alsa;
	int err;

	if (!(sdi = get_sigrok_device_instance(device_instances, 0)))
		return SIGROK_ERR;
	alsa = sdi->priv;

	err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV,
					SND_PCM_STREAM_CAPTURE, 0);
	if (err < 0) {
		g_warning("cannot open audio device %s (%s)", AUDIO_DEV,
				snd_strerror(err));
		return SIGROK_ERR;
	}

	err = snd_pcm_hw_params_malloc(&alsa->hw_params);
	if (err < 0) {
		g_warning("cannot allocate hardware parameter structure (%s)",
				snd_strerror(err));
		return SIGROK_ERR;
	}

	err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params);
	if (err < 0) {
		g_warning("cannot initialize hardware parameter structure (%s)",
				snd_strerror(err));
		return SIGROK_ERR;
	}

	return SIGROK_OK;
}

static void hw_closedev(int device_index)
{
	struct sigrok_device_instance *sdi;
	struct alsa *alsa;

	if (!(sdi = get_sigrok_device_instance(device_instances, 0)))
		return;
	alsa = sdi->priv;
	if (!alsa)
		return;

	if (alsa->hw_params)
		snd_pcm_hw_params_free(alsa->hw_params);
	if (alsa->capture_handle)
		snd_pcm_close(alsa->capture_handle);
}

static void hw_cleanup(void)
{
	struct sigrok_device_instance *sdi;

	if (!(sdi = get_sigrok_device_instance(device_instances, 0)))
		return;

	free(sdi->priv);
	sigrok_device_instance_free(sdi);
}

static void *hw_get_device_info(int device_index, int device_info_id)
{
	struct sigrok_device_instance *sdi;
	struct alsa *alsa;
	void *info = NULL;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return NULL;
	alsa = sdi->priv;

	switch (device_info_id) {
	case DI_INSTANCE:
		info = sdi;
		break;
	case DI_NUM_PROBES:
		info = GINT_TO_POINTER(NUM_PROBES);
		break;
	case DI_CUR_SAMPLERATE:
		info = &alsa->cur_rate;
		break;
	case DI_PROBE_TYPE:
		info = GINT_TO_POINTER(PROBE_TYPE_ANALOG);
		break;
	}

	return info;
}

static int hw_get_status(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	return ST_ACTIVE;
}

static int *hw_get_capabilities(void)
{
	return capabilities;
}

static int hw_set_configuration(int device_index, int capability, void *value)
{
	struct sigrok_device_instance *sdi;
	struct alsa *alsa;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return SIGROK_ERR;
	alsa = sdi->priv;

	switch (capability) {
	case HWCAP_PROBECONFIG:
		return SIGROK_OK;
	case HWCAP_SAMPLERATE:
		alsa->cur_rate = *(uint64_t *) value;
		return SIGROK_OK;
	case HWCAP_LIMIT_SAMPLES:
		alsa->limit_samples = *(uint64_t *) value;
		return SIGROK_OK;
	default:
		return SIGROK_ERR;
	}
}

static int receive_data(int fd, int revents, void *user_data)
{
	struct sigrok_device_instance *sdi = user_data;
	struct alsa *alsa = sdi->priv;
	struct datafeed_packet packet;
	struct analog_sample *sample;
	unsigned int sample_size = sizeof(struct analog_sample) +
		(NUM_PROBES * sizeof(struct analog_probe));
	char *outb;
	char inb[4096];
	int i, x, count;

	do {
		memset(inb, 0, sizeof(inb));
		count = snd_pcm_readi(alsa->capture_handle, inb,
			MIN(4096/4, alsa->limit_samples));
		if (count < 1) {
			g_warning("Failed to read samples");
			return FALSE;
		}

		outb = malloc(sample_size * count);
		if (!outb)
			return FALSE;

		for (i = 0; i < count; i++) {
			sample = (struct analog_sample *)
						(outb + (i * sample_size));
			sample->num_probes = NUM_PROBES;

			for (x = 0; x < NUM_PROBES; x++) {
				sample->probes[x].val =
					*(uint16_t *) (inb + (i * 4) + (x * 2));
				sample->probes[x].val &= ((1 << 16) - 1);
				sample->probes[x].res = 16;
			}
		}

		packet.type = DF_ANALOG;
		packet.length = count * sample_size;
		packet.unitsize = sample_size;
		packet.payload = outb;
		session_bus(user_data, &packet);
		free(outb);
		alsa->limit_samples -= count;

	} while (alsa->limit_samples > 0);

	packet.type = DF_END;
	session_bus(user_data, &packet);

	return TRUE;
}

static int hw_start_acquisition(int device_index, gpointer session_device_id)
{
	struct sigrok_device_instance *sdi;
	struct alsa *alsa;
	struct datafeed_packet packet;
	struct datafeed_header header;
	struct pollfd *ufds;
	int count;
	int err;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return SIGROK_ERR;
	alsa = sdi->priv;

	err = snd_pcm_hw_params_set_access(alsa->capture_handle,
			alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
	if (err < 0) {
		g_warning("cannot set access type (%s)", snd_strerror(err));
		return SIGROK_ERR;
	}

	/* FIXME: Hardcoded for 16bits */
	err = snd_pcm_hw_params_set_format(alsa->capture_handle,
			alsa->hw_params, SND_PCM_FORMAT_S16_LE);
	if (err < 0) {
		g_warning("cannot set sample format (%s)", snd_strerror(err));
		return SIGROK_ERR;
	}

	err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle,
			alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0);
	if (err < 0) {
		g_warning("cannot set sample rate (%s)", snd_strerror(err));
		return SIGROK_ERR;
	}

	err = snd_pcm_hw_params_set_channels(alsa->capture_handle,
			alsa->hw_params, NUM_PROBES);
	if (err < 0) {
		g_warning("cannot set channel count (%s)", snd_strerror(err));
		return SIGROK_ERR;
	}

	err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params);
	if (err < 0) {
		g_warning("cannot set parameters (%s)", snd_strerror(err));
		return SIGROK_ERR;
	}

	err = snd_pcm_prepare(alsa->capture_handle);
	if (err < 0) {
		g_warning("cannot prepare audio interface for use (%s)",
				snd_strerror(err));
		return SIGROK_ERR;
	}

	count = snd_pcm_poll_descriptors_count(alsa->capture_handle);
	if (count < 1) {
		g_warning("Unable to obtain poll descriptors count");
		return SIGROK_ERR;
	}

	ufds = malloc(count * sizeof(struct pollfd));
	if (!ufds)
		return SIGROK_ERR_MALLOC;

	err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count);
	if (err < 0) {
		g_warning("Unable to obtain poll descriptors (%s)",
				snd_strerror(err));
		free(ufds);
		return SIGROK_ERR;
	}

	alsa->session_id = session_device_id;
	source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi);

	packet.type = DF_HEADER;
	packet.length = sizeof(struct datafeed_header);
	packet.payload = (unsigned char *) &header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	header.samplerate = alsa->cur_rate;
	header.num_analog_probes = NUM_PROBES;
	header.num_logic_probes = 0;
	header.protocol_id = PROTO_RAW;
	session_bus(session_device_id, &packet);
	free(ufds);

	return SIGROK_OK;
}

static void hw_stop_acquisition(int device_index, gpointer session_device_id)
{
	/* Avoid compiler warnings. */
	device_index = device_index;
	session_device_id = session_device_id;
}

struct device_plugin alsa_plugin_info = {
	"alsa",
	1,
	hw_init,
	hw_cleanup,
	hw_opendev,
	hw_closedev,
	hw_get_device_info,
	hw_get_status,
	hw_get_capabilities,
	hw_set_configuration,
	hw_start_acquisition,
	hw_stop_acquisition,
};
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>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <stdlib.h>
	22	#include <unistd.h>
	23	#include <string.h>
	24	#include <sigrok.h>
	25	#include <alsa/asoundlib.h>
	26	#include "config.h"
	27
	28	#define NUM_PROBES 2
	29	#define SAMPLE_WIDTH 16
	30	#define AUDIO_DEV "plughw:0,0"
	31
	32	static int capabilities[] = {
	33	HWCAP_SAMPLERATE,
	34	HWCAP_LIMIT_SAMPLES,
	35	HWCAP_CONTINUOUS,
	36	};
	37
	38	static GSList *device_instances = NULL;
	39
	40	struct alsa {
	41	uint64_t cur_rate;
	42	uint64_t limit_samples;
	43	snd_pcm_t *capture_handle;
	44	snd_pcm_hw_params_t *hw_params;
	45	gpointer session_id;
	46	};
	47
	48	static int hw_init(char *deviceinfo)
	49	{
	50	struct sigrok_device_instance *sdi;
	51	struct alsa *alsa;
	52
	53	/* Avoid compiler warnings. */
	54	deviceinfo = deviceinfo;
	55
	56	alsa = malloc(sizeof(struct alsa));
	57	if (!alsa)
	58	return 0;
	59	memset(alsa, 0, sizeof(struct alsa));
	60
	61	sdi = sigrok_device_instance_new(0, ST_ACTIVE, "alsa", NULL, NULL);
	62	if (!sdi)
	63	goto free_alsa;
	64
65	sdi->priv = alsa;
66
67	device_instances = g_slist_append(device_instances, sdi);
68
69	return 1;
70	free_alsa:
71	free(alsa);
72	return 0;
73	}
74
75	static int hw_opendev(int device_index)
76	{
77	struct sigrok_device_instance *sdi;
78	struct alsa *alsa;
79	int err;
80
81	if (!(sdi = get_sigrok_device_instance(device_instances, 0)))
82	return SIGROK_ERR;
83	alsa = sdi->priv;
84
85	err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV,
86	SND_PCM_STREAM_CAPTURE, 0);
87	if (err < 0) {
88	g_warning("cannot open audio device %s (%s)", AUDIO_DEV,
89	snd_strerror(err));
90	return SIGROK_ERR;
91	}
92
93	err = snd_pcm_hw_params_malloc(&alsa->hw_params);
94	if (err < 0) {
95	g_warning("cannot allocate hardware parameter structure (%s)",
96	snd_strerror(err));
97	return SIGROK_ERR;
98	}
99
100	err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params);
101	if (err < 0) {
102	g_warning("cannot initialize hardware parameter structure (%s)",
103	snd_strerror(err));
104	return SIGROK_ERR;
105	}
106
107	return SIGROK_OK;
108	}
109
110	static void hw_closedev(int device_index)
111	{
112	struct sigrok_device_instance *sdi;
113	struct alsa *alsa;
114
115	if (!(sdi = get_sigrok_device_instance(device_instances, 0)))
116	return;
117	alsa = sdi->priv;
118	if (!alsa)
119	return;
120
121	if (alsa->hw_params)
122	snd_pcm_hw_params_free(alsa->hw_params);
123	if (alsa->capture_handle)
124	snd_pcm_close(alsa->capture_handle);
125	}
126
127	static void hw_cleanup(void)
128	{
129	struct sigrok_device_instance *sdi;
130
131	if (!(sdi = get_sigrok_device_instance(device_instances, 0)))
132	return;
133
134	free(sdi->priv);
135	sigrok_device_instance_free(sdi);
136	}
137
138	static void *hw_get_device_info(int device_index, int device_info_id)
139	{
140	struct sigrok_device_instance *sdi;
141	struct alsa *alsa;
142	void *info = NULL;
143
144	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
145	return NULL;
146	alsa = sdi->priv;
147
148	switch (device_info_id) {
149	case DI_INSTANCE:
150	info = sdi;
151	break;
152	case DI_NUM_PROBES:
153	info = GINT_TO_POINTER(NUM_PROBES);
154	break;
155	case DI_CUR_SAMPLERATE:
156	info = &alsa->cur_rate;
157	break;
158	case DI_PROBE_TYPE:
159	info = GINT_TO_POINTER(PROBE_TYPE_ANALOG);
160	break;
161	}
162
163	return info;
164	}
165
166	static int hw_get_status(int device_index)
167	{
168	/* Avoid compiler warnings. */
169	device_index = device_index;
170
171	return ST_ACTIVE;
172	}
173
174	static int *hw_get_capabilities(void)
175	{
176	return capabilities;
177	}
178
179	static int hw_set_configuration(int device_index, int capability, void *value)
180	{
181	struct sigrok_device_instance *sdi;
182	struct alsa *alsa;
183
184	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
185	return SIGROK_ERR;
186	alsa = sdi->priv;
187
188	switch (capability) {
189	case HWCAP_PROBECONFIG:
190	return SIGROK_OK;
191	case HWCAP_SAMPLERATE:
192	alsa->cur_rate = (uint64_t ) value;
193	return SIGROK_OK;
194	case HWCAP_LIMIT_SAMPLES:
195	alsa->limit_samples = (uint64_t ) value;
196	return SIGROK_OK;
197	default:
198	return SIGROK_ERR;
199	}
200	}
201
6ed4f044 DR	202	static int receive_data(int fd, int revents, void *user_data)
	203	{
	204	struct sigrok_device_instance *sdi = user_data;
	205	struct alsa *alsa = sdi->priv;
	206	struct datafeed_packet packet;
58330ab8 DR	207	struct analog_sample *sample;
	208	unsigned int sample_size = sizeof(struct analog_sample) +
	209	(NUM_PROBES * sizeof(struct analog_probe));
	210	char *outb;
	211	char inb[4096];
	212	int i, x, count;
	213
	214	do {
	215	memset(inb, 0, sizeof(inb));
	216	count = snd_pcm_readi(alsa->capture_handle, inb,
	217	MIN(4096/4, alsa->limit_samples));
	218	if (count < 1) {
	219	g_warning("Failed to read samples");
	220	return FALSE;
	221	}
6ed4f044	222
58330ab8 DR	223	outb = malloc(sample_size * count);
58330ab8 DR	224	if (!outb)
6ed4f044	225	return FALSE;
58330ab8 DR	226
	227	for (i = 0; i < count; i++) {
	228	sample = (struct analog_sample *)
	229	(outb + (i * sample_size));
	230	sample->num_probes = NUM_PROBES;
	231
	232	for (x = 0; x < NUM_PROBES; x++) {
	233	sample->probes[x].val =
	234	(uint16_t ) (inb + (i * 4) + (x * 2));
	235	sample->probes[x].val &= ((1 << 16) - 1);
	236	sample->probes[x].res = 16;
	237	}
6ed4f044	238	}
58330ab8 DR	239
	240	packet.type = DF_ANALOG;
	241	packet.length = count * sample_size;
	242	packet.unitsize = sample_size;
	243	packet.payload = outb;
	244	session_bus(user_data, &packet);
	245	free(outb);
	246	alsa->limit_samples -= count;
	247
	248	} while (alsa->limit_samples > 0);
	249
	250	packet.type = DF_END;
	251	session_bus(user_data, &packet);
6ed4f044 DR	252
	253	return TRUE;
	254	}
	255
	256	static int hw_start_acquisition(int device_index, gpointer session_device_id)
	257	{
	258	struct sigrok_device_instance *sdi;
	259	struct alsa *alsa;
	260	struct datafeed_packet packet;
	261	struct datafeed_header header;
	262	struct pollfd *ufds;
	263	int count;
	264	int err;
	265
	266	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
	267	return SIGROK_ERR;
	268	alsa = sdi->priv;
	269
	270	err = snd_pcm_hw_params_set_access(alsa->capture_handle,
	271	alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
	272	if (err < 0) {
	273	g_warning("cannot set access type (%s)", snd_strerror(err));
	274	return SIGROK_ERR;
	275	}
	276
	277	/* FIXME: Hardcoded for 16bits */
	278	err = snd_pcm_hw_params_set_format(alsa->capture_handle,
	279	alsa->hw_params, SND_PCM_FORMAT_S16_LE);
	280	if (err < 0) {
	281	g_warning("cannot set sample format (%s)", snd_strerror(err));
	282	return SIGROK_ERR;
	283	}
	284
	285	err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle,
	286	alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0);
	287	if (err < 0) {
	288	g_warning("cannot set sample rate (%s)", snd_strerror(err));
	289	return SIGROK_ERR;
	290	}
	291
	292	err = snd_pcm_hw_params_set_channels(alsa->capture_handle,
	293	alsa->hw_params, NUM_PROBES);
	294	if (err < 0) {
	295	g_warning("cannot set channel count (%s)", snd_strerror(err));
	296	return SIGROK_ERR;
	297	}
	298
	299	err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params);
	300	if (err < 0) {
	301	g_warning("cannot set parameters (%s)", snd_strerror(err));
	302	return SIGROK_ERR;
	303	}
	304
	305	err = snd_pcm_prepare(alsa->capture_handle);
	306	if (err < 0) {
	307	g_warning("cannot prepare audio interface for use (%s)",
	308	snd_strerror(err));
	309	return SIGROK_ERR;
	310	}
	311
	312	count = snd_pcm_poll_descriptors_count(alsa->capture_handle);
	313	if (count < 1) {
	314	g_warning("Unable to obtain poll descriptors count");
	315	return SIGROK_ERR;
316	}
317
318	ufds = malloc(count * sizeof(struct pollfd));
319	if (!ufds)
320	return SIGROK_ERR_MALLOC;
321
322	err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count);
323	if (err < 0) {
324	g_warning("Unable to obtain poll descriptors (%s)",
325	snd_strerror(err));
326	free(ufds);
327	return SIGROK_ERR;
328	}
329
330	alsa->session_id = session_device_id;
58330ab8	331	source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi);
6ed4f044 DR	332
	333	packet.type = DF_HEADER;
	334	packet.length = sizeof(struct datafeed_header);
	335	packet.payload = (unsigned char *) &header;
	336	header.feed_version = 1;
	337	gettimeofday(&header.starttime, NULL);
	338	header.samplerate = alsa->cur_rate;
	339	header.num_analog_probes = NUM_PROBES;
	340	header.num_logic_probes = 0;
	341	header.protocol_id = PROTO_RAW;
	342	session_bus(session_device_id, &packet);
	343	free(ufds);
	344
	345	return SIGROK_OK;
	346	}
	347
	348	static void hw_stop_acquisition(int device_index, gpointer session_device_id)
	349	{
	350	/* Avoid compiler warnings. */
	351	device_index = device_index;
	352	session_device_id = session_device_id;
	353	}
	354
	355	struct device_plugin alsa_plugin_info = {
	356	"alsa",
	357	1,
	358	hw_init,
	359	hw_cleanup,
	360	hw_opendev,
	361	hw_closedev,
	362	hw_get_device_info,
	363	hw_get_status,
	364	hw_get_capabilities,
	365	hw_set_configuration,
	366	hw_start_acquisition,
	367	hw_stop_acquisition,
	368	};