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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[] = { | |
5a2326a7 UH |
33 | SR_HWCAP_SAMPLERATE, |
34 | SR_HWCAP_LIMIT_SAMPLES, | |
35 | SR_HWCAP_CONTINUOUS, | |
6ed4f044 DR |
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 | ||
54ac5277 | 48 | static int hw_init(const char *deviceinfo) |
6ed4f044 | 49 | { |
a00ba012 | 50 | struct sr_device_instance *sdi; |
6ed4f044 DR |
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 | ||
5a2326a7 | 61 | sdi = sr_device_instance_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL); |
6ed4f044 DR |
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 | { | |
a00ba012 | 77 | struct sr_device_instance *sdi; |
6ed4f044 DR |
78 | struct alsa *alsa; |
79 | int err; | |
80 | ||
d32d961d | 81 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
e46b8fb1 | 82 | return SR_ERR; |
6ed4f044 DR |
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)); | |
e46b8fb1 | 90 | return SR_ERR; |
6ed4f044 DR |
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)); | |
e46b8fb1 | 97 | return SR_ERR; |
6ed4f044 DR |
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)); | |
e46b8fb1 | 104 | return SR_ERR; |
6ed4f044 DR |
105 | } |
106 | ||
e46b8fb1 | 107 | return SR_OK; |
6ed4f044 DR |
108 | } |
109 | ||
110 | static void hw_closedev(int device_index) | |
111 | { | |
a00ba012 | 112 | struct sr_device_instance *sdi; |
6ed4f044 DR |
113 | struct alsa *alsa; |
114 | ||
d32d961d | 115 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
6ed4f044 DR |
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 | { | |
a00ba012 | 129 | struct sr_device_instance *sdi; |
6ed4f044 | 130 | |
d32d961d | 131 | if (!(sdi = sr_get_device_instance(device_instances, 0))) |
6ed4f044 DR |
132 | return; |
133 | ||
134 | free(sdi->priv); | |
a00ba012 | 135 | sr_device_instance_free(sdi); |
6ed4f044 DR |
136 | } |
137 | ||
138 | static void *hw_get_device_info(int device_index, int device_info_id) | |
139 | { | |
a00ba012 | 140 | struct sr_device_instance *sdi; |
6ed4f044 DR |
141 | struct alsa *alsa; |
142 | void *info = NULL; | |
143 | ||
d32d961d | 144 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
6ed4f044 DR |
145 | return NULL; |
146 | alsa = sdi->priv; | |
147 | ||
148 | switch (device_info_id) { | |
5a2326a7 | 149 | case SR_DI_INSTANCE: |
6ed4f044 DR |
150 | info = sdi; |
151 | break; | |
5a2326a7 | 152 | case SR_DI_NUM_PROBES: |
6ed4f044 DR |
153 | info = GINT_TO_POINTER(NUM_PROBES); |
154 | break; | |
5a2326a7 | 155 | case SR_DI_CUR_SAMPLERATE: |
6ed4f044 DR |
156 | info = &alsa->cur_rate; |
157 | break; | |
5a2326a7 UH |
158 | // case SR_DI_PROBE_TYPE: |
159 | // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG); | |
da692373 | 160 | // break; |
6ed4f044 DR |
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 | ||
5a2326a7 | 171 | return SR_ST_ACTIVE; |
6ed4f044 DR |
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 | { | |
a00ba012 | 181 | struct sr_device_instance *sdi; |
6ed4f044 DR |
182 | struct alsa *alsa; |
183 | ||
d32d961d | 184 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
e46b8fb1 | 185 | return SR_ERR; |
6ed4f044 DR |
186 | alsa = sdi->priv; |
187 | ||
188 | switch (capability) { | |
5a2326a7 | 189 | case SR_HWCAP_PROBECONFIG: |
e46b8fb1 | 190 | return SR_OK; |
5a2326a7 | 191 | case SR_HWCAP_SAMPLERATE: |
6ed4f044 | 192 | alsa->cur_rate = *(uint64_t *) value; |
e46b8fb1 | 193 | return SR_OK; |
5a2326a7 | 194 | case SR_HWCAP_LIMIT_SAMPLES: |
6ed4f044 | 195 | alsa->limit_samples = *(uint64_t *) value; |
e46b8fb1 | 196 | return SR_OK; |
6ed4f044 | 197 | default: |
e46b8fb1 | 198 | return SR_ERR; |
6ed4f044 DR |
199 | } |
200 | } | |
201 | ||
6ed4f044 DR |
202 | static int receive_data(int fd, int revents, void *user_data) |
203 | { | |
a00ba012 | 204 | struct sr_device_instance *sdi = user_data; |
6ed4f044 | 205 | struct alsa *alsa = sdi->priv; |
b9c735a2 | 206 | struct sr_datafeed_packet packet; |
809c5f20 UH |
207 | struct sr_analog_sample *sample; |
208 | unsigned int sample_size = sizeof(struct sr_analog_sample) + | |
209 | (NUM_PROBES * sizeof(struct sr_analog_probe)); | |
58330ab8 DR |
210 | char *outb; |
211 | char inb[4096]; | |
212 | int i, x, count; | |
213 | ||
cdbc51d9 DR |
214 | fd = fd; |
215 | revents = revents; | |
216 | ||
58330ab8 DR |
217 | do { |
218 | memset(inb, 0, sizeof(inb)); | |
219 | count = snd_pcm_readi(alsa->capture_handle, inb, | |
220 | MIN(4096/4, alsa->limit_samples)); | |
221 | if (count < 1) { | |
222 | g_warning("Failed to read samples"); | |
223 | return FALSE; | |
224 | } | |
6ed4f044 | 225 | |
58330ab8 DR |
226 | outb = malloc(sample_size * count); |
227 | if (!outb) | |
6ed4f044 | 228 | return FALSE; |
58330ab8 DR |
229 | |
230 | for (i = 0; i < count; i++) { | |
809c5f20 | 231 | sample = (struct sr_analog_sample *) |
58330ab8 DR |
232 | (outb + (i * sample_size)); |
233 | sample->num_probes = NUM_PROBES; | |
234 | ||
235 | for (x = 0; x < NUM_PROBES; x++) { | |
236 | sample->probes[x].val = | |
237 | *(uint16_t *) (inb + (i * 4) + (x * 2)); | |
238 | sample->probes[x].val &= ((1 << 16) - 1); | |
239 | sample->probes[x].res = 16; | |
240 | } | |
6ed4f044 | 241 | } |
58330ab8 | 242 | |
5a2326a7 | 243 | packet.type = SR_DF_ANALOG; |
58330ab8 DR |
244 | packet.length = count * sample_size; |
245 | packet.unitsize = sample_size; | |
246 | packet.payload = outb; | |
8a2efef2 | 247 | sr_session_bus(user_data, &packet); |
58330ab8 DR |
248 | free(outb); |
249 | alsa->limit_samples -= count; | |
250 | ||
251 | } while (alsa->limit_samples > 0); | |
252 | ||
5a2326a7 | 253 | packet.type = SR_DF_END; |
8a2efef2 | 254 | sr_session_bus(user_data, &packet); |
6ed4f044 DR |
255 | |
256 | return TRUE; | |
257 | } | |
258 | ||
259 | static int hw_start_acquisition(int device_index, gpointer session_device_id) | |
260 | { | |
a00ba012 | 261 | struct sr_device_instance *sdi; |
6ed4f044 | 262 | struct alsa *alsa; |
b9c735a2 UH |
263 | struct sr_datafeed_packet packet; |
264 | struct sr_datafeed_header header; | |
6ed4f044 DR |
265 | struct pollfd *ufds; |
266 | int count; | |
267 | int err; | |
268 | ||
d32d961d | 269 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
e46b8fb1 | 270 | return SR_ERR; |
6ed4f044 DR |
271 | alsa = sdi->priv; |
272 | ||
273 | err = snd_pcm_hw_params_set_access(alsa->capture_handle, | |
274 | alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
275 | if (err < 0) { | |
276 | g_warning("cannot set access type (%s)", snd_strerror(err)); | |
e46b8fb1 | 277 | return SR_ERR; |
6ed4f044 DR |
278 | } |
279 | ||
280 | /* FIXME: Hardcoded for 16bits */ | |
281 | err = snd_pcm_hw_params_set_format(alsa->capture_handle, | |
282 | alsa->hw_params, SND_PCM_FORMAT_S16_LE); | |
283 | if (err < 0) { | |
284 | g_warning("cannot set sample format (%s)", snd_strerror(err)); | |
e46b8fb1 | 285 | return SR_ERR; |
6ed4f044 DR |
286 | } |
287 | ||
288 | err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle, | |
289 | alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0); | |
290 | if (err < 0) { | |
291 | g_warning("cannot set sample rate (%s)", snd_strerror(err)); | |
e46b8fb1 | 292 | return SR_ERR; |
6ed4f044 DR |
293 | } |
294 | ||
295 | err = snd_pcm_hw_params_set_channels(alsa->capture_handle, | |
296 | alsa->hw_params, NUM_PROBES); | |
297 | if (err < 0) { | |
298 | g_warning("cannot set channel count (%s)", snd_strerror(err)); | |
e46b8fb1 | 299 | return SR_ERR; |
6ed4f044 DR |
300 | } |
301 | ||
302 | err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params); | |
303 | if (err < 0) { | |
304 | g_warning("cannot set parameters (%s)", snd_strerror(err)); | |
e46b8fb1 | 305 | return SR_ERR; |
6ed4f044 DR |
306 | } |
307 | ||
308 | err = snd_pcm_prepare(alsa->capture_handle); | |
309 | if (err < 0) { | |
310 | g_warning("cannot prepare audio interface for use (%s)", | |
311 | snd_strerror(err)); | |
e46b8fb1 | 312 | return SR_ERR; |
6ed4f044 DR |
313 | } |
314 | ||
315 | count = snd_pcm_poll_descriptors_count(alsa->capture_handle); | |
316 | if (count < 1) { | |
317 | g_warning("Unable to obtain poll descriptors count"); | |
e46b8fb1 | 318 | return SR_ERR; |
6ed4f044 DR |
319 | } |
320 | ||
321 | ufds = malloc(count * sizeof(struct pollfd)); | |
322 | if (!ufds) | |
e46b8fb1 | 323 | return SR_ERR_MALLOC; |
6ed4f044 DR |
324 | |
325 | err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count); | |
326 | if (err < 0) { | |
327 | g_warning("Unable to obtain poll descriptors (%s)", | |
328 | snd_strerror(err)); | |
329 | free(ufds); | |
e46b8fb1 | 330 | return SR_ERR; |
6ed4f044 DR |
331 | } |
332 | ||
333 | alsa->session_id = session_device_id; | |
6f1be0a2 | 334 | sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi); |
6ed4f044 | 335 | |
5a2326a7 | 336 | packet.type = SR_DF_HEADER; |
b9c735a2 | 337 | packet.length = sizeof(struct sr_datafeed_header); |
6ed4f044 DR |
338 | packet.payload = (unsigned char *) &header; |
339 | header.feed_version = 1; | |
340 | gettimeofday(&header.starttime, NULL); | |
341 | header.samplerate = alsa->cur_rate; | |
342 | header.num_analog_probes = NUM_PROBES; | |
343 | header.num_logic_probes = 0; | |
5a2326a7 | 344 | header.protocol_id = SR_PROTO_RAW; |
8a2efef2 | 345 | sr_session_bus(session_device_id, &packet); |
6ed4f044 DR |
346 | free(ufds); |
347 | ||
e46b8fb1 | 348 | return SR_OK; |
6ed4f044 DR |
349 | } |
350 | ||
351 | static void hw_stop_acquisition(int device_index, gpointer session_device_id) | |
352 | { | |
353 | /* Avoid compiler warnings. */ | |
354 | device_index = device_index; | |
355 | session_device_id = session_device_id; | |
356 | } | |
357 | ||
5c2d46d1 | 358 | struct sr_device_plugin alsa_plugin_info = { |
6ed4f044 | 359 | "alsa", |
9f8274a5 | 360 | "ALSA driver", |
6ed4f044 DR |
361 | 1, |
362 | hw_init, | |
363 | hw_cleanup, | |
364 | hw_opendev, | |
365 | hw_closedev, | |
366 | hw_get_device_info, | |
367 | hw_get_status, | |
368 | hw_get_capabilities, | |
369 | hw_set_configuration, | |
370 | hw_start_acquisition, | |
371 | hw_stop_acquisition, | |
372 | }; |