2 * This file is part of the sigrok project.
4 * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
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.
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.
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
21 /* Note: This driver doesn't compile, analog support in sigrok is WIP. */
23 #include "config.h" /* Must come before sigrok.h */
27 #include <alsa/asoundlib.h>
29 #include "sigrok-internal.h"
32 #define SAMPLE_WIDTH 16
33 #define AUDIO_DEV "plughw:0,0"
35 struct sr_analog_probe {
37 uint8_t res; /* Needs to be a power of 2, FIXME */
38 uint16_t val; /* Max hardware ADC width is 16bits */
41 struct sr_analog_sample {
42 uint8_t num_probes; /* Max hardware probes is 256 */
43 struct sr_analog_probe probes[];
46 static int capabilities[] = {
48 SR_HWCAP_LIMIT_SAMPLES,
52 static const char *probe_names[NUM_PROBES + 1] = {
58 static GSList *device_instances = NULL;
62 uint64_t limit_samples;
63 snd_pcm_t *capture_handle;
64 snd_pcm_hw_params_t *hw_params;
68 static int hw_init(const char *deviceinfo)
70 struct sr_device_instance *sdi;
73 /* Avoid compiler warnings. */
74 deviceinfo = deviceinfo;
76 if (!(alsa = g_try_malloc0(sizeof(struct alsa)))) {
77 sr_err("alsa: %s: alsa malloc failed", __func__);
81 sdi = sr_device_instance_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL);
87 device_instances = g_slist_append(device_instances, sdi);
95 static int hw_opendev(int device_index)
97 struct sr_device_instance *sdi;
101 if (!(sdi = sr_get_device_instance(device_instances, device_index)))
105 err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV,
106 SND_PCM_STREAM_CAPTURE, 0);
108 sr_warn("cannot open audio device %s (%s)", AUDIO_DEV,
113 err = snd_pcm_hw_params_malloc(&alsa->hw_params);
115 sr_warn("cannot allocate hardware parameter structure (%s)",
120 err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params);
122 sr_warn("cannot initialize hardware parameter structure (%s)",
130 static int hw_closedev(int device_index)
132 struct sr_device_instance *sdi;
135 if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
136 sr_err("alsa: %s: sdi was NULL", __func__);
137 return SR_ERR; /* TODO: SR_ERR_ARG? */
140 if (!(alsa = sdi->priv)) {
141 sr_err("alsa: %s: sdi->priv was NULL", __func__);
142 return SR_ERR; /* TODO: SR_ERR_ARG? */
145 // TODO: Return values of snd_*?
147 snd_pcm_hw_params_free(alsa->hw_params);
148 if (alsa->capture_handle)
149 snd_pcm_close(alsa->capture_handle);
154 static void hw_cleanup(void)
156 struct sr_device_instance *sdi;
158 if (!(sdi = sr_get_device_instance(device_instances, 0)))
162 sr_device_instance_free(sdi);
165 static void *hw_get_device_info(int device_index, int device_info_id)
167 struct sr_device_instance *sdi;
171 if (!(sdi = sr_get_device_instance(device_instances, device_index)))
175 switch (device_info_id) {
179 case SR_DI_NUM_PROBES:
180 info = GINT_TO_POINTER(NUM_PROBES);
182 case SR_DI_PROBE_NAMES:
185 case SR_DI_CUR_SAMPLERATE:
186 info = &alsa->cur_rate;
188 // case SR_DI_PROBE_TYPE:
189 // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG);
196 static int hw_get_status(int device_index)
198 /* Avoid compiler warnings. */
199 device_index = device_index;
204 static int *hw_get_capabilities(void)
209 static int hw_set_configuration(int device_index, int capability, void *value)
211 struct sr_device_instance *sdi;
214 if (!(sdi = sr_get_device_instance(device_instances, device_index)))
218 switch (capability) {
219 case SR_HWCAP_PROBECONFIG:
221 case SR_HWCAP_SAMPLERATE:
222 alsa->cur_rate = *(uint64_t *) value;
224 case SR_HWCAP_LIMIT_SAMPLES:
225 alsa->limit_samples = *(uint64_t *) value;
232 static int receive_data(int fd, int revents, void *user_data)
234 struct sr_device_instance *sdi = user_data;
235 struct alsa *alsa = sdi->priv;
236 struct sr_datafeed_packet packet;
237 struct sr_analog_sample *sample;
238 unsigned int sample_size = sizeof(struct sr_analog_sample) +
239 (NUM_PROBES * sizeof(struct sr_analog_probe));
248 memset(inb, 0, sizeof(inb));
249 count = snd_pcm_readi(alsa->capture_handle, inb,
250 MIN(4096/4, alsa->limit_samples));
252 sr_warn("Failed to read samples");
256 if (!(outb = g_try_malloc(sample_size * count))) {
257 sr_err("alsa: %s: outb malloc failed", __func__);
261 for (i = 0; i < count; i++) {
262 sample = (struct sr_analog_sample *)
263 (outb + (i * sample_size));
264 sample->num_probes = NUM_PROBES;
266 for (x = 0; x < NUM_PROBES; x++) {
267 sample->probes[x].val =
268 *(uint16_t *) (inb + (i * 4) + (x * 2));
269 sample->probes[x].val &= ((1 << 16) - 1);
270 sample->probes[x].res = 16;
274 packet.type = SR_DF_ANALOG;
275 packet.length = count * sample_size;
276 packet.unitsize = sample_size;
277 packet.payload = outb;
278 sr_session_bus(user_data, &packet);
280 alsa->limit_samples -= count;
282 } while (alsa->limit_samples > 0);
284 packet.type = SR_DF_END;
285 sr_session_bus(user_data, &packet);
290 static int hw_start_acquisition(int device_index, gpointer session_device_id)
292 struct sr_device_instance *sdi;
294 struct sr_datafeed_packet packet;
295 struct sr_datafeed_header header;
300 if (!(sdi = sr_get_device_instance(device_instances, device_index)))
304 err = snd_pcm_hw_params_set_access(alsa->capture_handle,
305 alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
307 sr_warn("cannot set access type (%s)", snd_strerror(err));
311 /* FIXME: Hardcoded for 16bits */
312 err = snd_pcm_hw_params_set_format(alsa->capture_handle,
313 alsa->hw_params, SND_PCM_FORMAT_S16_LE);
315 sr_warn("cannot set sample format (%s)", snd_strerror(err));
319 err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle,
320 alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0);
322 sr_warn("cannot set sample rate (%s)", snd_strerror(err));
326 err = snd_pcm_hw_params_set_channels(alsa->capture_handle,
327 alsa->hw_params, NUM_PROBES);
329 sr_warn("cannot set channel count (%s)", snd_strerror(err));
333 err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params);
335 sr_warn("cannot set parameters (%s)", snd_strerror(err));
339 err = snd_pcm_prepare(alsa->capture_handle);
341 sr_warn("cannot prepare audio interface for use (%s)",
346 count = snd_pcm_poll_descriptors_count(alsa->capture_handle);
348 sr_warn("Unable to obtain poll descriptors count");
352 if (!(ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
353 sr_warn("alsa: %s: ufds malloc failed", __func__);
354 return SR_ERR_MALLOC;
357 err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count);
359 sr_warn("Unable to obtain poll descriptors (%s)",
365 alsa->session_id = session_device_id;
366 sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi);
368 packet.type = SR_DF_HEADER;
369 packet.length = sizeof(struct sr_datafeed_header);
370 packet.payload = (unsigned char *) &header;
371 header.feed_version = 1;
372 gettimeofday(&header.starttime, NULL);
373 header.samplerate = alsa->cur_rate;
374 header.num_analog_probes = NUM_PROBES;
375 header.num_logic_probes = 0;
376 header.protocol_id = SR_PROTO_RAW;
377 sr_session_bus(session_device_id, &packet);
383 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
385 /* Avoid compiler warnings. */
386 device_index = device_index;
387 session_device_id = session_device_id;
390 struct sr_device_plugin alsa_plugin_info = {
392 .longname = "ALSA driver",
395 .cleanup = hw_cleanup,
396 .opendev = hw_opendev,
397 .closedev = hw_closedev,
398 .get_device_info = hw_get_device_info,
399 .get_status = hw_get_status,
400 .get_capabilities = hw_get_capabilities,
401 .set_configuration = hw_set_configuration,
402 .start_acquisition = hw_start_acquisition,
403 .stop_acquisition = hw_stop_acquisition,