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CommitLineData
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
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21/* Note: This driver doesn't compile, analog support in sigrok is WIP. */
22
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23#include <stdlib.h>
24#include <unistd.h>
25#include <string.h>
6ed4f044 26#include <alsa/asoundlib.h>
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27#include "sigrok.h"
28#include "sigrok-internal.h"
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29
30#define NUM_PROBES 2
31#define SAMPLE_WIDTH 16
32#define AUDIO_DEV "plughw:0,0"
33
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34struct sr_analog_probe {
35 uint8_t att;
36 uint8_t res; /* Needs to be a power of 2, FIXME */
37 uint16_t val; /* Max hardware ADC width is 16bits */
38};
39
40struct sr_analog_sample {
41 uint8_t num_probes; /* Max hardware probes is 256 */
42 struct sr_analog_probe probes[];
43};
44
ffedd0bf 45static int hwcaps[] = {
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46 SR_HWCAP_SAMPLERATE,
47 SR_HWCAP_LIMIT_SAMPLES,
48 SR_HWCAP_CONTINUOUS,
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49};
50
c37d2b1b 51static const char *probe_names[NUM_PROBES + 1] = {
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52 "0",
53 "1",
54 NULL,
55};
56
d68e2d1a 57static GSList *dev_insts = NULL;
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58
59struct alsa {
60 uint64_t cur_rate;
61 uint64_t limit_samples;
62 snd_pcm_t *capture_handle;
63 snd_pcm_hw_params_t *hw_params;
64 gpointer session_id;
65};
66
bb7ef793 67static int hw_init(const char *devinfo)
6ed4f044 68{
d68e2d1a 69 struct sr_dev_inst *sdi;
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70 struct alsa *alsa;
71
72 /* Avoid compiler warnings. */
bb7ef793 73 devinfo = devinfo;
6ed4f044 74
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75 if (!(alsa = g_try_malloc0(sizeof(struct alsa)))) {
76 sr_err("alsa: %s: alsa malloc failed", __func__);
6ed4f044 77 return 0;
92b3101c 78 }
6ed4f044 79
d3683c42 80 sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL);
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DR
81 if (!sdi)
82 goto free_alsa;
83
84 sdi->priv = alsa;
85
d68e2d1a 86 dev_insts = g_slist_append(dev_insts, sdi);
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87
88 return 1;
ffedd0bf 89
6ed4f044 90free_alsa:
92b3101c 91 g_free(alsa);
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92 return 0;
93}
94
bb7ef793 95static int hw_opendev(int dev_index)
6ed4f044 96{
d68e2d1a 97 struct sr_dev_inst *sdi;
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98 struct alsa *alsa;
99 int err;
100
bb7ef793 101 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
e46b8fb1 102 return SR_ERR;
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103 alsa = sdi->priv;
104
105 err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV,
106 SND_PCM_STREAM_CAPTURE, 0);
107 if (err < 0) {
7b48d6e1 108 sr_err("alsa: can't open audio device %s (%s)", AUDIO_DEV,
133a37bf 109 snd_strerror(err));
e46b8fb1 110 return SR_ERR;
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DR
111 }
112
113 err = snd_pcm_hw_params_malloc(&alsa->hw_params);
114 if (err < 0) {
7b48d6e1 115 sr_err("alsa: can't allocate hardware parameter structure (%s)",
133a37bf 116 snd_strerror(err));
e46b8fb1 117 return SR_ERR;
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118 }
119
120 err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params);
121 if (err < 0) {
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UH
122 sr_err("alsa: can't initialize hardware parameter structure "
123 "(%s)", snd_strerror(err));
e46b8fb1 124 return SR_ERR;
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125 }
126
e46b8fb1 127 return SR_OK;
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128}
129
bb7ef793 130static int hw_closedev(int dev_index)
6ed4f044 131{
d68e2d1a 132 struct sr_dev_inst *sdi;
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133 struct alsa *alsa;
134
bb7ef793 135 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
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UH
136 sr_err("alsa: %s: sdi was NULL", __func__);
137 return SR_ERR; /* TODO: SR_ERR_ARG? */
138 }
6ed4f044 139
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140 if (!(alsa = sdi->priv)) {
141 sr_err("alsa: %s: sdi->priv was NULL", __func__);
142 return SR_ERR; /* TODO: SR_ERR_ARG? */
143 }
144
145 // TODO: Return values of snd_*?
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146 if (alsa->hw_params)
147 snd_pcm_hw_params_free(alsa->hw_params);
148 if (alsa->capture_handle)
149 snd_pcm_close(alsa->capture_handle);
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150
151 return SR_OK;
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152}
153
57ab7d9f 154static int hw_cleanup(void)
6ed4f044 155{
d68e2d1a 156 struct sr_dev_inst *sdi;
6ed4f044 157
d68e2d1a 158 if (!(sdi = sr_dev_inst_get(dev_insts, 0))) {
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UH
159 sr_err("alsa: %s: sdi was NULL", __func__);
160 return SR_ERR_BUG;
161 }
6ed4f044 162
d3683c42 163 sr_dev_inst_free(sdi);
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164
165 return SR_OK;
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DR
166}
167
bb7ef793 168static void *hw_get_dev_info(int dev_index, int dev_info_id)
6ed4f044 169{
d68e2d1a 170 struct sr_dev_inst *sdi;
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171 struct alsa *alsa;
172 void *info = NULL;
173
bb7ef793 174 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
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175 return NULL;
176 alsa = sdi->priv;
177
bb7ef793 178 switch (dev_info_id) {
1d9a8a5f 179 case SR_DI_INST:
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180 info = sdi;
181 break;
5a2326a7 182 case SR_DI_NUM_PROBES:
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183 info = GINT_TO_POINTER(NUM_PROBES);
184 break;
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185 case SR_DI_PROBE_NAMES:
186 info = probe_names;
187 break;
5a2326a7 188 case SR_DI_CUR_SAMPLERATE:
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189 info = &alsa->cur_rate;
190 break;
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UH
191 // case SR_DI_PROBE_TYPE:
192 // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG);
da692373 193 // break;
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194 }
195
196 return info;
197}
198
bb7ef793 199static int hw_get_status(int dev_index)
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200{
201 /* Avoid compiler warnings. */
bb7ef793 202 dev_index = dev_index;
6ed4f044 203
5a2326a7 204 return SR_ST_ACTIVE;
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DR
205}
206
ffedd0bf 207static int *hw_hwcap_get_all(void)
6ed4f044 208{
ffedd0bf 209 return hwcaps;
6ed4f044
DR
210}
211
a7d05fcb 212static int hw_config_set(int dev_index, int hwcap, void *value)
6ed4f044 213{
d68e2d1a 214 struct sr_dev_inst *sdi;
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215 struct alsa *alsa;
216
bb7ef793 217 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
e46b8fb1 218 return SR_ERR;
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219 alsa = sdi->priv;
220
ffedd0bf 221 switch (hwcap) {
5a2326a7 222 case SR_HWCAP_PROBECONFIG:
e46b8fb1 223 return SR_OK;
5a2326a7 224 case SR_HWCAP_SAMPLERATE:
6ed4f044 225 alsa->cur_rate = *(uint64_t *) value;
e46b8fb1 226 return SR_OK;
5a2326a7 227 case SR_HWCAP_LIMIT_SAMPLES:
6ed4f044 228 alsa->limit_samples = *(uint64_t *) value;
e46b8fb1 229 return SR_OK;
6ed4f044 230 default:
e46b8fb1 231 return SR_ERR;
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DR
232 }
233}
234
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235static int receive_data(int fd, int revents, void *user_data)
236{
d68e2d1a 237 struct sr_dev_inst *sdi = user_data;
6ed4f044 238 struct alsa *alsa = sdi->priv;
b9c735a2 239 struct sr_datafeed_packet packet;
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240 struct sr_analog_sample *sample;
241 unsigned int sample_size = sizeof(struct sr_analog_sample) +
242 (NUM_PROBES * sizeof(struct sr_analog_probe));
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243 char *outb;
244 char inb[4096];
245 int i, x, count;
246
cdbc51d9
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247 fd = fd;
248 revents = revents;
249
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250 do {
251 memset(inb, 0, sizeof(inb));
252 count = snd_pcm_readi(alsa->capture_handle, inb,
253 MIN(4096/4, alsa->limit_samples));
254 if (count < 1) {
7b48d6e1 255 sr_err("alsa: Failed to read samples");
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256 return FALSE;
257 }
6ed4f044 258
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UH
259 if (!(outb = g_try_malloc(sample_size * count))) {
260 sr_err("alsa: %s: outb malloc failed", __func__);
6ed4f044 261 return FALSE;
92b3101c 262 }
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263
264 for (i = 0; i < count; i++) {
809c5f20 265 sample = (struct sr_analog_sample *)
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DR
266 (outb + (i * sample_size));
267 sample->num_probes = NUM_PROBES;
268
269 for (x = 0; x < NUM_PROBES; x++) {
270 sample->probes[x].val =
271 *(uint16_t *) (inb + (i * 4) + (x * 2));
272 sample->probes[x].val &= ((1 << 16) - 1);
273 sample->probes[x].res = 16;
274 }
6ed4f044 275 }
58330ab8 276
5a2326a7 277 packet.type = SR_DF_ANALOG;
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DR
278 packet.length = count * sample_size;
279 packet.unitsize = sample_size;
280 packet.payload = outb;
8a2efef2 281 sr_session_bus(user_data, &packet);
92b3101c 282 g_free(outb);
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DR
283 alsa->limit_samples -= count;
284
285 } while (alsa->limit_samples > 0);
286
5a2326a7 287 packet.type = SR_DF_END;
8a2efef2 288 sr_session_bus(user_data, &packet);
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289
290 return TRUE;
291}
292
bb7ef793 293static int hw_start_acquisition(int dev_index, gpointer session_dev_id)
6ed4f044 294{
d68e2d1a 295 struct sr_dev_inst *sdi;
6ed4f044 296 struct alsa *alsa;
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UH
297 struct sr_datafeed_packet packet;
298 struct sr_datafeed_header header;
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299 struct pollfd *ufds;
300 int count;
301 int err;
302
bb7ef793 303 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
e46b8fb1 304 return SR_ERR;
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305 alsa = sdi->priv;
306
307 err = snd_pcm_hw_params_set_access(alsa->capture_handle,
308 alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
309 if (err < 0) {
7b48d6e1 310 sr_err("alsa: can't set access type (%s)", snd_strerror(err));
e46b8fb1 311 return SR_ERR;
6ed4f044
DR
312 }
313
314 /* FIXME: Hardcoded for 16bits */
315 err = snd_pcm_hw_params_set_format(alsa->capture_handle,
316 alsa->hw_params, SND_PCM_FORMAT_S16_LE);
317 if (err < 0) {
7b48d6e1 318 sr_err("alsa: can't set sample format (%s)", snd_strerror(err));
e46b8fb1 319 return SR_ERR;
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DR
320 }
321
322 err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle,
323 alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0);
324 if (err < 0) {
7b48d6e1 325 sr_err("alsa: can't set sample rate (%s)", snd_strerror(err));
e46b8fb1 326 return SR_ERR;
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DR
327 }
328
329 err = snd_pcm_hw_params_set_channels(alsa->capture_handle,
330 alsa->hw_params, NUM_PROBES);
331 if (err < 0) {
7b48d6e1 332 sr_err("alsa: can't set channel count (%s)", snd_strerror(err));
e46b8fb1 333 return SR_ERR;
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DR
334 }
335
336 err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params);
337 if (err < 0) {
7b48d6e1 338 sr_err("alsa: can't set parameters (%s)", snd_strerror(err));
e46b8fb1 339 return SR_ERR;
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DR
340 }
341
342 err = snd_pcm_prepare(alsa->capture_handle);
343 if (err < 0) {
7b48d6e1 344 sr_err("alsa: can't prepare audio interface for use (%s)",
133a37bf 345 snd_strerror(err));
e46b8fb1 346 return SR_ERR;
6ed4f044
DR
347 }
348
349 count = snd_pcm_poll_descriptors_count(alsa->capture_handle);
350 if (count < 1) {
7b48d6e1 351 sr_err("alsa: Unable to obtain poll descriptors count");
e46b8fb1 352 return SR_ERR;
6ed4f044
DR
353 }
354
92b3101c 355 if (!(ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
133a37bf 356 sr_err("alsa: %s: ufds malloc failed", __func__);
e46b8fb1 357 return SR_ERR_MALLOC;
92b3101c 358 }
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DR
359
360 err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count);
361 if (err < 0) {
7b48d6e1 362 sr_err("alsa: Unable to obtain poll descriptors (%s)",
133a37bf 363 snd_strerror(err));
92b3101c 364 g_free(ufds);
e46b8fb1 365 return SR_ERR;
6ed4f044
DR
366 }
367
bb7ef793 368 alsa->session_id = session_dev_id;
6f1be0a2 369 sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi);
6ed4f044 370
5a2326a7 371 packet.type = SR_DF_HEADER;
b9c735a2 372 packet.length = sizeof(struct sr_datafeed_header);
6ed4f044
DR
373 packet.payload = (unsigned char *) &header;
374 header.feed_version = 1;
375 gettimeofday(&header.starttime, NULL);
376 header.samplerate = alsa->cur_rate;
377 header.num_analog_probes = NUM_PROBES;
378 header.num_logic_probes = 0;
5a2326a7 379 header.protocol_id = SR_PROTO_RAW;
bb7ef793 380 sr_session_bus(session_dev_id, &packet);
92b3101c 381 g_free(ufds);
6ed4f044 382
e46b8fb1 383 return SR_OK;
6ed4f044
DR
384}
385
bb7ef793 386static int hw_stop_acquisition(int dev_index, gpointer session_dev_id)
6ed4f044
DR
387{
388 /* Avoid compiler warnings. */
bb7ef793
UH
389 dev_index = dev_index;
390 session_dev_id = session_dev_id;
3010f21c
UH
391
392 return SR_OK;
6ed4f044
DR
393}
394
bb7ef793 395SR_PRIV struct sr_dev_plugin alsa_plugin_info = {
e519ba86
UH
396 .name = "alsa",
397 .longname = "ALSA driver",
398 .api_version = 1,
399 .init = hw_init,
400 .cleanup = hw_cleanup,
86f5e3d8
UH
401 .opendev = hw_opendev,
402 .closedev = hw_closedev,
bb7ef793 403 .get_dev_info = hw_get_dev_info,
e519ba86 404 .get_status = hw_get_status,
ffedd0bf 405 .hwcap_get_all = hw_hwcap_get_all,
a7d05fcb 406 .config_set = hw_config_set,
e519ba86
UH
407 .start_acquisition = hw_start_acquisition,
408 .stop_acquisition = hw_stop_acquisition,
6ed4f044 409};