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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 | ||
92b3101c | 21 | #include "config.h" /* Must come before sigrok.h */ |
6ed4f044 DR |
22 | #include <stdlib.h> |
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <sigrok.h> | |
92b3101c | 26 | #include <sigrok-internal.h> |
6ed4f044 | 27 | #include <alsa/asoundlib.h> |
6ed4f044 DR |
28 | |
29 | #define NUM_PROBES 2 | |
30 | #define SAMPLE_WIDTH 16 | |
31 | #define AUDIO_DEV "plughw:0,0" | |
32 | ||
33 | static int capabilities[] = { | |
5a2326a7 UH |
34 | SR_HWCAP_SAMPLERATE, |
35 | SR_HWCAP_LIMIT_SAMPLES, | |
36 | SR_HWCAP_CONTINUOUS, | |
6ed4f044 DR |
37 | }; |
38 | ||
39 | static GSList *device_instances = NULL; | |
40 | ||
41 | struct alsa { | |
42 | uint64_t cur_rate; | |
43 | uint64_t limit_samples; | |
44 | snd_pcm_t *capture_handle; | |
45 | snd_pcm_hw_params_t *hw_params; | |
46 | gpointer session_id; | |
47 | }; | |
48 | ||
54ac5277 | 49 | static int hw_init(const char *deviceinfo) |
6ed4f044 | 50 | { |
a00ba012 | 51 | struct sr_device_instance *sdi; |
6ed4f044 DR |
52 | struct alsa *alsa; |
53 | ||
54 | /* Avoid compiler warnings. */ | |
55 | deviceinfo = deviceinfo; | |
56 | ||
92b3101c UH |
57 | if (!(alsa = g_try_malloc0(sizeof(struct alsa)))) { |
58 | sr_err("alsa: %s: alsa malloc failed", __func__); | |
6ed4f044 | 59 | return 0; |
92b3101c | 60 | } |
6ed4f044 | 61 | |
5a2326a7 | 62 | sdi = sr_device_instance_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL); |
6ed4f044 DR |
63 | if (!sdi) |
64 | goto free_alsa; | |
65 | ||
66 | sdi->priv = alsa; | |
67 | ||
68 | device_instances = g_slist_append(device_instances, sdi); | |
69 | ||
70 | return 1; | |
71 | free_alsa: | |
92b3101c | 72 | g_free(alsa); |
6ed4f044 DR |
73 | return 0; |
74 | } | |
75 | ||
76 | static int hw_opendev(int device_index) | |
77 | { | |
a00ba012 | 78 | struct sr_device_instance *sdi; |
6ed4f044 DR |
79 | struct alsa *alsa; |
80 | int err; | |
81 | ||
d32d961d | 82 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
e46b8fb1 | 83 | return SR_ERR; |
6ed4f044 DR |
84 | alsa = sdi->priv; |
85 | ||
86 | err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV, | |
87 | SND_PCM_STREAM_CAPTURE, 0); | |
88 | if (err < 0) { | |
b08024a8 | 89 | sr_warn("cannot open audio device %s (%s)", AUDIO_DEV, |
92b3101c | 90 | snd_strerror(err)); |
e46b8fb1 | 91 | return SR_ERR; |
6ed4f044 DR |
92 | } |
93 | ||
94 | err = snd_pcm_hw_params_malloc(&alsa->hw_params); | |
95 | if (err < 0) { | |
b08024a8 | 96 | sr_warn("cannot allocate hardware parameter structure (%s)", |
92b3101c | 97 | snd_strerror(err)); |
e46b8fb1 | 98 | return SR_ERR; |
6ed4f044 DR |
99 | } |
100 | ||
101 | err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params); | |
102 | if (err < 0) { | |
b08024a8 | 103 | sr_warn("cannot initialize hardware parameter structure (%s)", |
6ed4f044 | 104 | snd_strerror(err)); |
e46b8fb1 | 105 | return SR_ERR; |
6ed4f044 DR |
106 | } |
107 | ||
e46b8fb1 | 108 | return SR_OK; |
6ed4f044 DR |
109 | } |
110 | ||
697785d1 | 111 | static int hw_closedev(int device_index) |
6ed4f044 | 112 | { |
a00ba012 | 113 | struct sr_device_instance *sdi; |
6ed4f044 DR |
114 | struct alsa *alsa; |
115 | ||
697785d1 UH |
116 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) { |
117 | sr_err("alsa: %s: sdi was NULL", __func__); | |
118 | return SR_ERR; /* TODO: SR_ERR_ARG? */ | |
119 | } | |
6ed4f044 | 120 | |
697785d1 UH |
121 | if (!(alsa = sdi->priv)) { |
122 | sr_err("alsa: %s: sdi->priv was NULL", __func__); | |
123 | return SR_ERR; /* TODO: SR_ERR_ARG? */ | |
124 | } | |
125 | ||
126 | // TODO: Return values of snd_*? | |
6ed4f044 DR |
127 | if (alsa->hw_params) |
128 | snd_pcm_hw_params_free(alsa->hw_params); | |
129 | if (alsa->capture_handle) | |
130 | snd_pcm_close(alsa->capture_handle); | |
697785d1 UH |
131 | |
132 | return SR_OK; | |
6ed4f044 DR |
133 | } |
134 | ||
135 | static void hw_cleanup(void) | |
136 | { | |
a00ba012 | 137 | struct sr_device_instance *sdi; |
6ed4f044 | 138 | |
d32d961d | 139 | if (!(sdi = sr_get_device_instance(device_instances, 0))) |
6ed4f044 DR |
140 | return; |
141 | ||
142 | free(sdi->priv); | |
a00ba012 | 143 | sr_device_instance_free(sdi); |
6ed4f044 DR |
144 | } |
145 | ||
146 | static void *hw_get_device_info(int device_index, int device_info_id) | |
147 | { | |
a00ba012 | 148 | struct sr_device_instance *sdi; |
6ed4f044 DR |
149 | struct alsa *alsa; |
150 | void *info = NULL; | |
151 | ||
d32d961d | 152 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
6ed4f044 DR |
153 | return NULL; |
154 | alsa = sdi->priv; | |
155 | ||
156 | switch (device_info_id) { | |
5a2326a7 | 157 | case SR_DI_INSTANCE: |
6ed4f044 DR |
158 | info = sdi; |
159 | break; | |
5a2326a7 | 160 | case SR_DI_NUM_PROBES: |
6ed4f044 DR |
161 | info = GINT_TO_POINTER(NUM_PROBES); |
162 | break; | |
5a2326a7 | 163 | case SR_DI_CUR_SAMPLERATE: |
6ed4f044 DR |
164 | info = &alsa->cur_rate; |
165 | break; | |
5a2326a7 UH |
166 | // case SR_DI_PROBE_TYPE: |
167 | // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG); | |
da692373 | 168 | // break; |
6ed4f044 DR |
169 | } |
170 | ||
171 | return info; | |
172 | } | |
173 | ||
174 | static int hw_get_status(int device_index) | |
175 | { | |
176 | /* Avoid compiler warnings. */ | |
177 | device_index = device_index; | |
178 | ||
5a2326a7 | 179 | return SR_ST_ACTIVE; |
6ed4f044 DR |
180 | } |
181 | ||
182 | static int *hw_get_capabilities(void) | |
183 | { | |
184 | return capabilities; | |
185 | } | |
186 | ||
187 | static int hw_set_configuration(int device_index, int capability, void *value) | |
188 | { | |
a00ba012 | 189 | struct sr_device_instance *sdi; |
6ed4f044 DR |
190 | struct alsa *alsa; |
191 | ||
d32d961d | 192 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
e46b8fb1 | 193 | return SR_ERR; |
6ed4f044 DR |
194 | alsa = sdi->priv; |
195 | ||
196 | switch (capability) { | |
5a2326a7 | 197 | case SR_HWCAP_PROBECONFIG: |
e46b8fb1 | 198 | return SR_OK; |
5a2326a7 | 199 | case SR_HWCAP_SAMPLERATE: |
6ed4f044 | 200 | alsa->cur_rate = *(uint64_t *) value; |
e46b8fb1 | 201 | return SR_OK; |
5a2326a7 | 202 | case SR_HWCAP_LIMIT_SAMPLES: |
6ed4f044 | 203 | alsa->limit_samples = *(uint64_t *) value; |
e46b8fb1 | 204 | return SR_OK; |
6ed4f044 | 205 | default: |
e46b8fb1 | 206 | return SR_ERR; |
6ed4f044 DR |
207 | } |
208 | } | |
209 | ||
6ed4f044 DR |
210 | static int receive_data(int fd, int revents, void *user_data) |
211 | { | |
a00ba012 | 212 | struct sr_device_instance *sdi = user_data; |
6ed4f044 | 213 | struct alsa *alsa = sdi->priv; |
b9c735a2 | 214 | struct sr_datafeed_packet packet; |
809c5f20 UH |
215 | struct sr_analog_sample *sample; |
216 | unsigned int sample_size = sizeof(struct sr_analog_sample) + | |
217 | (NUM_PROBES * sizeof(struct sr_analog_probe)); | |
58330ab8 DR |
218 | char *outb; |
219 | char inb[4096]; | |
220 | int i, x, count; | |
221 | ||
cdbc51d9 DR |
222 | fd = fd; |
223 | revents = revents; | |
224 | ||
58330ab8 DR |
225 | do { |
226 | memset(inb, 0, sizeof(inb)); | |
227 | count = snd_pcm_readi(alsa->capture_handle, inb, | |
228 | MIN(4096/4, alsa->limit_samples)); | |
229 | if (count < 1) { | |
b08024a8 | 230 | sr_warn("Failed to read samples"); |
58330ab8 DR |
231 | return FALSE; |
232 | } | |
6ed4f044 | 233 | |
92b3101c UH |
234 | if (!(outb = g_try_malloc(sample_size * count))) { |
235 | sr_err("alsa: %s: outb malloc failed", __func__); | |
6ed4f044 | 236 | return FALSE; |
92b3101c | 237 | } |
58330ab8 DR |
238 | |
239 | for (i = 0; i < count; i++) { | |
809c5f20 | 240 | sample = (struct sr_analog_sample *) |
58330ab8 DR |
241 | (outb + (i * sample_size)); |
242 | sample->num_probes = NUM_PROBES; | |
243 | ||
244 | for (x = 0; x < NUM_PROBES; x++) { | |
245 | sample->probes[x].val = | |
246 | *(uint16_t *) (inb + (i * 4) + (x * 2)); | |
247 | sample->probes[x].val &= ((1 << 16) - 1); | |
248 | sample->probes[x].res = 16; | |
249 | } | |
6ed4f044 | 250 | } |
58330ab8 | 251 | |
5a2326a7 | 252 | packet.type = SR_DF_ANALOG; |
58330ab8 DR |
253 | packet.length = count * sample_size; |
254 | packet.unitsize = sample_size; | |
255 | packet.payload = outb; | |
8a2efef2 | 256 | sr_session_bus(user_data, &packet); |
92b3101c | 257 | g_free(outb); |
58330ab8 DR |
258 | alsa->limit_samples -= count; |
259 | ||
260 | } while (alsa->limit_samples > 0); | |
261 | ||
5a2326a7 | 262 | packet.type = SR_DF_END; |
8a2efef2 | 263 | sr_session_bus(user_data, &packet); |
6ed4f044 DR |
264 | |
265 | return TRUE; | |
266 | } | |
267 | ||
268 | static int hw_start_acquisition(int device_index, gpointer session_device_id) | |
269 | { | |
a00ba012 | 270 | struct sr_device_instance *sdi; |
6ed4f044 | 271 | struct alsa *alsa; |
b9c735a2 UH |
272 | struct sr_datafeed_packet packet; |
273 | struct sr_datafeed_header header; | |
6ed4f044 DR |
274 | struct pollfd *ufds; |
275 | int count; | |
276 | int err; | |
277 | ||
d32d961d | 278 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) |
e46b8fb1 | 279 | return SR_ERR; |
6ed4f044 DR |
280 | alsa = sdi->priv; |
281 | ||
282 | err = snd_pcm_hw_params_set_access(alsa->capture_handle, | |
283 | alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
284 | if (err < 0) { | |
b08024a8 | 285 | sr_warn("cannot set access type (%s)", snd_strerror(err)); |
e46b8fb1 | 286 | return SR_ERR; |
6ed4f044 DR |
287 | } |
288 | ||
289 | /* FIXME: Hardcoded for 16bits */ | |
290 | err = snd_pcm_hw_params_set_format(alsa->capture_handle, | |
291 | alsa->hw_params, SND_PCM_FORMAT_S16_LE); | |
292 | if (err < 0) { | |
b08024a8 | 293 | sr_warn("cannot set sample format (%s)", snd_strerror(err)); |
e46b8fb1 | 294 | return SR_ERR; |
6ed4f044 DR |
295 | } |
296 | ||
297 | err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle, | |
298 | alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0); | |
299 | if (err < 0) { | |
b08024a8 | 300 | sr_warn("cannot set sample rate (%s)", snd_strerror(err)); |
e46b8fb1 | 301 | return SR_ERR; |
6ed4f044 DR |
302 | } |
303 | ||
304 | err = snd_pcm_hw_params_set_channels(alsa->capture_handle, | |
305 | alsa->hw_params, NUM_PROBES); | |
306 | if (err < 0) { | |
b08024a8 | 307 | sr_warn("cannot set channel count (%s)", snd_strerror(err)); |
e46b8fb1 | 308 | return SR_ERR; |
6ed4f044 DR |
309 | } |
310 | ||
311 | err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params); | |
312 | if (err < 0) { | |
b08024a8 | 313 | sr_warn("cannot set parameters (%s)", snd_strerror(err)); |
e46b8fb1 | 314 | return SR_ERR; |
6ed4f044 DR |
315 | } |
316 | ||
317 | err = snd_pcm_prepare(alsa->capture_handle); | |
318 | if (err < 0) { | |
b08024a8 | 319 | sr_warn("cannot prepare audio interface for use (%s)", |
6ed4f044 | 320 | snd_strerror(err)); |
e46b8fb1 | 321 | return SR_ERR; |
6ed4f044 DR |
322 | } |
323 | ||
324 | count = snd_pcm_poll_descriptors_count(alsa->capture_handle); | |
325 | if (count < 1) { | |
b08024a8 | 326 | sr_warn("Unable to obtain poll descriptors count"); |
e46b8fb1 | 327 | return SR_ERR; |
6ed4f044 DR |
328 | } |
329 | ||
92b3101c UH |
330 | if (!(ufds = g_try_malloc(count * sizeof(struct pollfd)))) { |
331 | sr_warn("alsa: %s: ufds malloc failed", __func__); | |
e46b8fb1 | 332 | return SR_ERR_MALLOC; |
92b3101c | 333 | } |
6ed4f044 DR |
334 | |
335 | err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count); | |
336 | if (err < 0) { | |
b08024a8 | 337 | sr_warn("Unable to obtain poll descriptors (%s)", |
6ed4f044 | 338 | snd_strerror(err)); |
92b3101c | 339 | g_free(ufds); |
e46b8fb1 | 340 | return SR_ERR; |
6ed4f044 DR |
341 | } |
342 | ||
343 | alsa->session_id = session_device_id; | |
6f1be0a2 | 344 | sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi); |
6ed4f044 | 345 | |
5a2326a7 | 346 | packet.type = SR_DF_HEADER; |
b9c735a2 | 347 | packet.length = sizeof(struct sr_datafeed_header); |
6ed4f044 DR |
348 | packet.payload = (unsigned char *) &header; |
349 | header.feed_version = 1; | |
350 | gettimeofday(&header.starttime, NULL); | |
351 | header.samplerate = alsa->cur_rate; | |
352 | header.num_analog_probes = NUM_PROBES; | |
353 | header.num_logic_probes = 0; | |
5a2326a7 | 354 | header.protocol_id = SR_PROTO_RAW; |
8a2efef2 | 355 | sr_session_bus(session_device_id, &packet); |
92b3101c | 356 | g_free(ufds); |
6ed4f044 | 357 | |
e46b8fb1 | 358 | return SR_OK; |
6ed4f044 DR |
359 | } |
360 | ||
361 | static void hw_stop_acquisition(int device_index, gpointer session_device_id) | |
362 | { | |
363 | /* Avoid compiler warnings. */ | |
364 | device_index = device_index; | |
365 | session_device_id = session_device_id; | |
366 | } | |
367 | ||
5c2d46d1 | 368 | struct sr_device_plugin alsa_plugin_info = { |
e519ba86 UH |
369 | .name = "alsa", |
370 | .longname = "ALSA driver", | |
371 | .api_version = 1, | |
372 | .init = hw_init, | |
373 | .cleanup = hw_cleanup, | |
86f5e3d8 UH |
374 | .opendev = hw_opendev, |
375 | .closedev = hw_closedev, | |
e519ba86 UH |
376 | .get_device_info = hw_get_device_info, |
377 | .get_status = hw_get_status, | |
378 | .get_capabilities = hw_get_capabilities, | |
379 | .set_configuration = hw_set_configuration, | |
380 | .start_acquisition = hw_start_acquisition, | |
381 | .stop_acquisition = hw_stop_acquisition, | |
6ed4f044 | 382 | }; |