--- /dev/null
+/*
+ * 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;
+ }
+}
+
+/*
+ * FIXME: This is incomplete, i couldn't get poll() to work with alsa fds yet.
+ */
+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;
+ char buf[128];
+ int i, err;
+
+ g_warning("entered receive_data");
+
+ for (i = 0; i < 10; i++) {
+ if ((err = snd_pcm_readi(alsa->capture_handle, buf, 128)) != 128) {
+ g_warning("read from audio interface failed (%s)\n",
+ snd_strerror(err));
+ return FALSE;
+ }
+ g_warning("data read ok");
+ }
+
+ 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].revents, -1, 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,
+};
projects / libsigrok.git / commitdiff