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Commit | Line | Data |
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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 | ||
a4cfb10f UH |
21 | /* Note: This driver doesn't compile, analog support in sigrok is WIP. */ |
22 | ||
6ed4f044 DR |
23 | #include <stdlib.h> |
24 | #include <unistd.h> | |
25 | #include <string.h> | |
6ed4f044 | 26 | #include <alsa/asoundlib.h> |
b7f09cf8 UH |
27 | #include "sigrok.h" |
28 | #include "sigrok-internal.h" | |
6ed4f044 DR |
29 | |
30 | #define NUM_PROBES 2 | |
31 | #define SAMPLE_WIDTH 16 | |
32 | #define AUDIO_DEV "plughw:0,0" | |
33 | ||
a4cfb10f UH |
34 | struct 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 | ||
40 | struct sr_analog_sample { | |
41 | uint8_t num_probes; /* Max hardware probes is 256 */ | |
42 | struct sr_analog_probe probes[]; | |
43 | }; | |
44 | ||
6ed4f044 | 45 | static int capabilities[] = { |
5a2326a7 UH |
46 | SR_HWCAP_SAMPLERATE, |
47 | SR_HWCAP_LIMIT_SAMPLES, | |
48 | SR_HWCAP_CONTINUOUS, | |
6ed4f044 DR |
49 | }; |
50 | ||
c37d2b1b | 51 | static const char *probe_names[NUM_PROBES + 1] = { |
464d12c7 KS |
52 | "0", |
53 | "1", | |
54 | NULL, | |
55 | }; | |
56 | ||
6ed4f044 DR |
57 | static GSList *device_instances = NULL; |
58 | ||
59 | struct 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 | ||
54ac5277 | 67 | static int hw_init(const char *deviceinfo) |
6ed4f044 | 68 | { |
a00ba012 | 69 | struct sr_device_instance *sdi; |
6ed4f044 DR |
70 | struct alsa *alsa; |
71 | ||
72 | /* Avoid compiler warnings. */ | |
73 | deviceinfo = deviceinfo; | |
74 | ||
92b3101c UH |
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); |
6ed4f044 DR |
81 | if (!sdi) |
82 | goto free_alsa; | |
83 | ||
84 | sdi->priv = alsa; | |
85 | ||
86 | device_instances = g_slist_append(device_instances, sdi); | |
87 | ||
88 | return 1; | |
89 | free_alsa: | |
92b3101c | 90 | g_free(alsa); |
6ed4f044 DR |
91 | return 0; |
92 | } | |
93 | ||
94 | static int hw_opendev(int device_index) | |
95 | { | |
a00ba012 | 96 | struct sr_device_instance *sdi; |
6ed4f044 DR |
97 | struct alsa *alsa; |
98 | int err; | |
99 | ||
da1466d6 | 100 | if (!(sdi = sr_dev_inst_get(device_instances, device_index))) |
e46b8fb1 | 101 | return SR_ERR; |
6ed4f044 DR |
102 | alsa = sdi->priv; |
103 | ||
104 | err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV, | |
105 | SND_PCM_STREAM_CAPTURE, 0); | |
106 | if (err < 0) { | |
133a37bf UH |
107 | sr_err("cannot open audio device %s (%s)", AUDIO_DEV, |
108 | snd_strerror(err)); | |
e46b8fb1 | 109 | return SR_ERR; |
6ed4f044 DR |
110 | } |
111 | ||
112 | err = snd_pcm_hw_params_malloc(&alsa->hw_params); | |
113 | if (err < 0) { | |
133a37bf UH |
114 | sr_err("cannot allocate hardware parameter structure (%s)", |
115 | snd_strerror(err)); | |
e46b8fb1 | 116 | return SR_ERR; |
6ed4f044 DR |
117 | } |
118 | ||
119 | err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params); | |
120 | if (err < 0) { | |
133a37bf UH |
121 | sr_err("cannot initialize hardware parameter structure (%s)", |
122 | snd_strerror(err)); | |
e46b8fb1 | 123 | return SR_ERR; |
6ed4f044 DR |
124 | } |
125 | ||
e46b8fb1 | 126 | return SR_OK; |
6ed4f044 DR |
127 | } |
128 | ||
697785d1 | 129 | static int hw_closedev(int device_index) |
6ed4f044 | 130 | { |
a00ba012 | 131 | struct sr_device_instance *sdi; |
6ed4f044 DR |
132 | struct alsa *alsa; |
133 | ||
da1466d6 | 134 | if (!(sdi = sr_dev_inst_get(device_instances, device_index))) { |
697785d1 UH |
135 | sr_err("alsa: %s: sdi was NULL", __func__); |
136 | return SR_ERR; /* TODO: SR_ERR_ARG? */ | |
137 | } | |
6ed4f044 | 138 | |
697785d1 UH |
139 | if (!(alsa = sdi->priv)) { |
140 | sr_err("alsa: %s: sdi->priv was NULL", __func__); | |
141 | return SR_ERR; /* TODO: SR_ERR_ARG? */ | |
142 | } | |
143 | ||
144 | // TODO: Return values of snd_*? | |
6ed4f044 DR |
145 | if (alsa->hw_params) |
146 | snd_pcm_hw_params_free(alsa->hw_params); | |
147 | if (alsa->capture_handle) | |
148 | snd_pcm_close(alsa->capture_handle); | |
697785d1 UH |
149 | |
150 | return SR_OK; | |
6ed4f044 DR |
151 | } |
152 | ||
57ab7d9f | 153 | static int hw_cleanup(void) |
6ed4f044 | 154 | { |
a00ba012 | 155 | struct sr_device_instance *sdi; |
6ed4f044 | 156 | |
da1466d6 | 157 | if (!(sdi = sr_dev_inst_get(device_instances, 0))) { |
57ab7d9f UH |
158 | sr_err("alsa: %s: sdi was NULL", __func__); |
159 | return SR_ERR_BUG; | |
160 | } | |
6ed4f044 | 161 | |
d3683c42 | 162 | sr_dev_inst_free(sdi); |
57ab7d9f UH |
163 | |
164 | return SR_OK; | |
6ed4f044 DR |
165 | } |
166 | ||
167 | static void *hw_get_device_info(int device_index, int device_info_id) | |
168 | { | |
a00ba012 | 169 | struct sr_device_instance *sdi; |
6ed4f044 DR |
170 | struct alsa *alsa; |
171 | void *info = NULL; | |
172 | ||
da1466d6 | 173 | if (!(sdi = sr_dev_inst_get(device_instances, device_index))) |
6ed4f044 DR |
174 | return NULL; |
175 | alsa = sdi->priv; | |
176 | ||
177 | switch (device_info_id) { | |
5a2326a7 | 178 | case SR_DI_INSTANCE: |
6ed4f044 DR |
179 | info = sdi; |
180 | break; | |
5a2326a7 | 181 | case SR_DI_NUM_PROBES: |
6ed4f044 DR |
182 | info = GINT_TO_POINTER(NUM_PROBES); |
183 | break; | |
464d12c7 KS |
184 | case SR_DI_PROBE_NAMES: |
185 | info = probe_names; | |
186 | break; | |
5a2326a7 | 187 | case SR_DI_CUR_SAMPLERATE: |
6ed4f044 DR |
188 | info = &alsa->cur_rate; |
189 | break; | |
5a2326a7 UH |
190 | // case SR_DI_PROBE_TYPE: |
191 | // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG); | |
da692373 | 192 | // break; |
6ed4f044 DR |
193 | } |
194 | ||
195 | return info; | |
196 | } | |
197 | ||
198 | static int hw_get_status(int device_index) | |
199 | { | |
200 | /* Avoid compiler warnings. */ | |
201 | device_index = device_index; | |
202 | ||
5a2326a7 | 203 | return SR_ST_ACTIVE; |
6ed4f044 DR |
204 | } |
205 | ||
206 | static int *hw_get_capabilities(void) | |
207 | { | |
208 | return capabilities; | |
209 | } | |
210 | ||
211 | static int hw_set_configuration(int device_index, int capability, void *value) | |
212 | { | |
a00ba012 | 213 | struct sr_device_instance *sdi; |
6ed4f044 DR |
214 | struct alsa *alsa; |
215 | ||
da1466d6 | 216 | if (!(sdi = sr_dev_inst_get(device_instances, device_index))) |
e46b8fb1 | 217 | return SR_ERR; |
6ed4f044 DR |
218 | alsa = sdi->priv; |
219 | ||
220 | switch (capability) { | |
5a2326a7 | 221 | case SR_HWCAP_PROBECONFIG: |
e46b8fb1 | 222 | return SR_OK; |
5a2326a7 | 223 | case SR_HWCAP_SAMPLERATE: |
6ed4f044 | 224 | alsa->cur_rate = *(uint64_t *) value; |
e46b8fb1 | 225 | return SR_OK; |
5a2326a7 | 226 | case SR_HWCAP_LIMIT_SAMPLES: |
6ed4f044 | 227 | alsa->limit_samples = *(uint64_t *) value; |
e46b8fb1 | 228 | return SR_OK; |
6ed4f044 | 229 | default: |
e46b8fb1 | 230 | return SR_ERR; |
6ed4f044 DR |
231 | } |
232 | } | |
233 | ||
6ed4f044 DR |
234 | static int receive_data(int fd, int revents, void *user_data) |
235 | { | |
a00ba012 | 236 | struct sr_device_instance *sdi = user_data; |
6ed4f044 | 237 | struct alsa *alsa = sdi->priv; |
b9c735a2 | 238 | struct sr_datafeed_packet packet; |
809c5f20 UH |
239 | struct sr_analog_sample *sample; |
240 | unsigned int sample_size = sizeof(struct sr_analog_sample) + | |
241 | (NUM_PROBES * sizeof(struct sr_analog_probe)); | |
58330ab8 DR |
242 | char *outb; |
243 | char inb[4096]; | |
244 | int i, x, count; | |
245 | ||
cdbc51d9 DR |
246 | fd = fd; |
247 | revents = revents; | |
248 | ||
58330ab8 DR |
249 | do { |
250 | memset(inb, 0, sizeof(inb)); | |
251 | count = snd_pcm_readi(alsa->capture_handle, inb, | |
252 | MIN(4096/4, alsa->limit_samples)); | |
253 | if (count < 1) { | |
133a37bf | 254 | sr_err("Failed to read samples"); |
58330ab8 DR |
255 | return FALSE; |
256 | } | |
6ed4f044 | 257 | |
92b3101c UH |
258 | if (!(outb = g_try_malloc(sample_size * count))) { |
259 | sr_err("alsa: %s: outb malloc failed", __func__); | |
6ed4f044 | 260 | return FALSE; |
92b3101c | 261 | } |
58330ab8 DR |
262 | |
263 | for (i = 0; i < count; i++) { | |
809c5f20 | 264 | sample = (struct sr_analog_sample *) |
58330ab8 DR |
265 | (outb + (i * sample_size)); |
266 | sample->num_probes = NUM_PROBES; | |
267 | ||
268 | for (x = 0; x < NUM_PROBES; x++) { | |
269 | sample->probes[x].val = | |
270 | *(uint16_t *) (inb + (i * 4) + (x * 2)); | |
271 | sample->probes[x].val &= ((1 << 16) - 1); | |
272 | sample->probes[x].res = 16; | |
273 | } | |
6ed4f044 | 274 | } |
58330ab8 | 275 | |
5a2326a7 | 276 | packet.type = SR_DF_ANALOG; |
58330ab8 DR |
277 | packet.length = count * sample_size; |
278 | packet.unitsize = sample_size; | |
279 | packet.payload = outb; | |
8a2efef2 | 280 | sr_session_bus(user_data, &packet); |
92b3101c | 281 | g_free(outb); |
58330ab8 DR |
282 | alsa->limit_samples -= count; |
283 | ||
284 | } while (alsa->limit_samples > 0); | |
285 | ||
5a2326a7 | 286 | packet.type = SR_DF_END; |
8a2efef2 | 287 | sr_session_bus(user_data, &packet); |
6ed4f044 DR |
288 | |
289 | return TRUE; | |
290 | } | |
291 | ||
292 | static int hw_start_acquisition(int device_index, gpointer session_device_id) | |
293 | { | |
a00ba012 | 294 | struct sr_device_instance *sdi; |
6ed4f044 | 295 | struct alsa *alsa; |
b9c735a2 UH |
296 | struct sr_datafeed_packet packet; |
297 | struct sr_datafeed_header header; | |
6ed4f044 DR |
298 | struct pollfd *ufds; |
299 | int count; | |
300 | int err; | |
301 | ||
da1466d6 | 302 | if (!(sdi = sr_dev_inst_get(device_instances, device_index))) |
e46b8fb1 | 303 | return SR_ERR; |
6ed4f044 DR |
304 | alsa = sdi->priv; |
305 | ||
306 | err = snd_pcm_hw_params_set_access(alsa->capture_handle, | |
307 | alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
308 | if (err < 0) { | |
133a37bf | 309 | sr_err("cannot set access type (%s)", snd_strerror(err)); |
e46b8fb1 | 310 | return SR_ERR; |
6ed4f044 DR |
311 | } |
312 | ||
313 | /* FIXME: Hardcoded for 16bits */ | |
314 | err = snd_pcm_hw_params_set_format(alsa->capture_handle, | |
315 | alsa->hw_params, SND_PCM_FORMAT_S16_LE); | |
316 | if (err < 0) { | |
133a37bf | 317 | sr_err("cannot set sample format (%s)", snd_strerror(err)); |
e46b8fb1 | 318 | return SR_ERR; |
6ed4f044 DR |
319 | } |
320 | ||
321 | err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle, | |
322 | alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0); | |
323 | if (err < 0) { | |
133a37bf | 324 | sr_err("cannot set sample rate (%s)", snd_strerror(err)); |
e46b8fb1 | 325 | return SR_ERR; |
6ed4f044 DR |
326 | } |
327 | ||
328 | err = snd_pcm_hw_params_set_channels(alsa->capture_handle, | |
329 | alsa->hw_params, NUM_PROBES); | |
330 | if (err < 0) { | |
133a37bf | 331 | sr_err("cannot set channel count (%s)", snd_strerror(err)); |
e46b8fb1 | 332 | return SR_ERR; |
6ed4f044 DR |
333 | } |
334 | ||
335 | err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params); | |
336 | if (err < 0) { | |
133a37bf | 337 | sr_err("cannot set parameters (%s)", snd_strerror(err)); |
e46b8fb1 | 338 | return SR_ERR; |
6ed4f044 DR |
339 | } |
340 | ||
341 | err = snd_pcm_prepare(alsa->capture_handle); | |
342 | if (err < 0) { | |
133a37bf UH |
343 | sr_err("cannot prepare audio interface for use (%s)", |
344 | snd_strerror(err)); | |
e46b8fb1 | 345 | return SR_ERR; |
6ed4f044 DR |
346 | } |
347 | ||
348 | count = snd_pcm_poll_descriptors_count(alsa->capture_handle); | |
349 | if (count < 1) { | |
133a37bf | 350 | sr_err("Unable to obtain poll descriptors count"); |
e46b8fb1 | 351 | return SR_ERR; |
6ed4f044 DR |
352 | } |
353 | ||
92b3101c | 354 | if (!(ufds = g_try_malloc(count * sizeof(struct pollfd)))) { |
133a37bf | 355 | sr_err("alsa: %s: ufds malloc failed", __func__); |
e46b8fb1 | 356 | return SR_ERR_MALLOC; |
92b3101c | 357 | } |
6ed4f044 DR |
358 | |
359 | err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count); | |
360 | if (err < 0) { | |
133a37bf UH |
361 | sr_err("Unable to obtain poll descriptors (%s)", |
362 | snd_strerror(err)); | |
92b3101c | 363 | g_free(ufds); |
e46b8fb1 | 364 | return SR_ERR; |
6ed4f044 DR |
365 | } |
366 | ||
367 | alsa->session_id = session_device_id; | |
6f1be0a2 | 368 | sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi); |
6ed4f044 | 369 | |
5a2326a7 | 370 | packet.type = SR_DF_HEADER; |
b9c735a2 | 371 | packet.length = sizeof(struct sr_datafeed_header); |
6ed4f044 DR |
372 | packet.payload = (unsigned char *) &header; |
373 | header.feed_version = 1; | |
374 | gettimeofday(&header.starttime, NULL); | |
375 | header.samplerate = alsa->cur_rate; | |
376 | header.num_analog_probes = NUM_PROBES; | |
377 | header.num_logic_probes = 0; | |
5a2326a7 | 378 | header.protocol_id = SR_PROTO_RAW; |
8a2efef2 | 379 | sr_session_bus(session_device_id, &packet); |
92b3101c | 380 | g_free(ufds); |
6ed4f044 | 381 | |
e46b8fb1 | 382 | return SR_OK; |
6ed4f044 DR |
383 | } |
384 | ||
3010f21c | 385 | static int hw_stop_acquisition(int device_index, gpointer session_device_id) |
6ed4f044 DR |
386 | { |
387 | /* Avoid compiler warnings. */ | |
388 | device_index = device_index; | |
389 | session_device_id = session_device_id; | |
3010f21c UH |
390 | |
391 | return SR_OK; | |
6ed4f044 DR |
392 | } |
393 | ||
ca070ed9 | 394 | SR_PRIV struct sr_device_plugin alsa_plugin_info = { |
e519ba86 UH |
395 | .name = "alsa", |
396 | .longname = "ALSA driver", | |
397 | .api_version = 1, | |
398 | .init = hw_init, | |
399 | .cleanup = hw_cleanup, | |
86f5e3d8 UH |
400 | .opendev = hw_opendev, |
401 | .closedev = hw_closedev, | |
e519ba86 UH |
402 | .get_device_info = hw_get_device_info, |
403 | .get_status = hw_get_status, | |
404 | .get_capabilities = hw_get_capabilities, | |
405 | .set_configuration = hw_set_configuration, | |
406 | .start_acquisition = hw_start_acquisition, | |
407 | .stop_acquisition = hw_stop_acquisition, | |
6ed4f044 | 408 | }; |