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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 | /* Note: This driver doesn't compile, analog support in sigrok is WIP. */ | |
22 | ||
23 | #include <stdlib.h> | |
24 | #include <unistd.h> | |
25 | #include <string.h> | |
26 | #include <alsa/asoundlib.h> | |
27 | #include "sigrok.h" | |
28 | #include "sigrok-internal.h" | |
29 | ||
30 | #define NUM_PROBES 2 | |
31 | #define SAMPLE_WIDTH 16 | |
32 | #define AUDIO_DEV "plughw:0,0" | |
33 | ||
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 | ||
45 | static int hwcaps[] = { | |
46 | SR_HWCAP_SAMPLERATE, | |
47 | SR_HWCAP_LIMIT_SAMPLES, | |
48 | SR_HWCAP_CONTINUOUS, | |
49 | }; | |
50 | ||
51 | static const char *probe_names[NUM_PROBES + 1] = { | |
52 | "0", | |
53 | "1", | |
54 | NULL, | |
55 | }; | |
56 | ||
57 | static GSList *dev_insts = 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 | ||
67 | static int hw_init(const char *devinfo) | |
68 | { | |
69 | struct sr_dev_inst *sdi; | |
70 | struct alsa *alsa; | |
71 | ||
72 | /* Avoid compiler warnings. */ | |
73 | devinfo = devinfo; | |
74 | ||
75 | if (!(alsa = g_try_malloc0(sizeof(struct alsa)))) { | |
76 | sr_err("alsa: %s: alsa malloc failed", __func__); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL); | |
81 | if (!sdi) | |
82 | goto free_alsa; | |
83 | ||
84 | sdi->priv = alsa; | |
85 | ||
86 | dev_insts = g_slist_append(dev_insts, sdi); | |
87 | ||
88 | return 1; | |
89 | ||
90 | free_alsa: | |
91 | g_free(alsa); | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static int hw_opendev(int dev_index) | |
96 | { | |
97 | struct sr_dev_inst *sdi; | |
98 | struct alsa *alsa; | |
99 | int err; | |
100 | ||
101 | if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) | |
102 | return SR_ERR; | |
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) { | |
108 | sr_err("alsa: can't open audio device %s (%s)", AUDIO_DEV, | |
109 | snd_strerror(err)); | |
110 | return SR_ERR; | |
111 | } | |
112 | ||
113 | err = snd_pcm_hw_params_malloc(&alsa->hw_params); | |
114 | if (err < 0) { | |
115 | sr_err("alsa: can't allocate hardware parameter structure (%s)", | |
116 | snd_strerror(err)); | |
117 | return SR_ERR; | |
118 | } | |
119 | ||
120 | err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params); | |
121 | if (err < 0) { | |
122 | sr_err("alsa: can't initialize hardware parameter structure " | |
123 | "(%s)", snd_strerror(err)); | |
124 | return SR_ERR; | |
125 | } | |
126 | ||
127 | return SR_OK; | |
128 | } | |
129 | ||
130 | static int hw_closedev(int dev_index) | |
131 | { | |
132 | struct sr_dev_inst *sdi; | |
133 | struct alsa *alsa; | |
134 | ||
135 | if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) { | |
136 | sr_err("alsa: %s: sdi was NULL", __func__); | |
137 | return SR_ERR; /* TODO: SR_ERR_ARG? */ | |
138 | } | |
139 | ||
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_*? | |
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); | |
150 | ||
151 | return SR_OK; | |
152 | } | |
153 | ||
154 | static int hw_cleanup(void) | |
155 | { | |
156 | struct sr_dev_inst *sdi; | |
157 | ||
158 | if (!(sdi = sr_dev_inst_get(dev_insts, 0))) { | |
159 | sr_err("alsa: %s: sdi was NULL", __func__); | |
160 | return SR_ERR_BUG; | |
161 | } | |
162 | ||
163 | sr_dev_inst_free(sdi); | |
164 | ||
165 | return SR_OK; | |
166 | } | |
167 | ||
168 | static void *hw_get_dev_info(int dev_index, int dev_info_id) | |
169 | { | |
170 | struct sr_dev_inst *sdi; | |
171 | struct alsa *alsa; | |
172 | void *info = NULL; | |
173 | ||
174 | if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) | |
175 | return NULL; | |
176 | alsa = sdi->priv; | |
177 | ||
178 | switch (dev_info_id) { | |
179 | case SR_DI_INST: | |
180 | info = sdi; | |
181 | break; | |
182 | case SR_DI_NUM_PROBES: | |
183 | info = GINT_TO_POINTER(NUM_PROBES); | |
184 | break; | |
185 | case SR_DI_PROBE_NAMES: | |
186 | info = probe_names; | |
187 | break; | |
188 | case SR_DI_CUR_SAMPLERATE: | |
189 | info = &alsa->cur_rate; | |
190 | break; | |
191 | // case SR_DI_PROBE_TYPE: | |
192 | // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG); | |
193 | // break; | |
194 | } | |
195 | ||
196 | return info; | |
197 | } | |
198 | ||
199 | static int hw_get_status(int dev_index) | |
200 | { | |
201 | /* Avoid compiler warnings. */ | |
202 | dev_index = dev_index; | |
203 | ||
204 | return SR_ST_ACTIVE; | |
205 | } | |
206 | ||
207 | static int *hw_hwcap_get_all(void) | |
208 | { | |
209 | return hwcaps; | |
210 | } | |
211 | ||
212 | static int hw_config_set(int dev_index, int hwcap, void *value) | |
213 | { | |
214 | struct sr_dev_inst *sdi; | |
215 | struct alsa *alsa; | |
216 | ||
217 | if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) | |
218 | return SR_ERR; | |
219 | alsa = sdi->priv; | |
220 | ||
221 | switch (hwcap) { | |
222 | case SR_HWCAP_PROBECONFIG: | |
223 | return SR_OK; | |
224 | case SR_HWCAP_SAMPLERATE: | |
225 | alsa->cur_rate = *(uint64_t *) value; | |
226 | return SR_OK; | |
227 | case SR_HWCAP_LIMIT_SAMPLES: | |
228 | alsa->limit_samples = *(uint64_t *) value; | |
229 | return SR_OK; | |
230 | default: | |
231 | return SR_ERR; | |
232 | } | |
233 | } | |
234 | ||
235 | static int receive_data(int fd, int revents, void *user_data) | |
236 | { | |
237 | struct sr_dev_inst *sdi = user_data; | |
238 | struct alsa *alsa = sdi->priv; | |
239 | struct sr_datafeed_packet packet; | |
240 | struct sr_analog_sample *sample; | |
241 | unsigned int sample_size = sizeof(struct sr_analog_sample) + | |
242 | (NUM_PROBES * sizeof(struct sr_analog_probe)); | |
243 | char *outb; | |
244 | char inb[4096]; | |
245 | int i, x, count; | |
246 | ||
247 | fd = fd; | |
248 | revents = revents; | |
249 | ||
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) { | |
255 | sr_err("alsa: Failed to read samples"); | |
256 | return FALSE; | |
257 | } | |
258 | ||
259 | if (!(outb = g_try_malloc(sample_size * count))) { | |
260 | sr_err("alsa: %s: outb malloc failed", __func__); | |
261 | return FALSE; | |
262 | } | |
263 | ||
264 | for (i = 0; i < count; i++) { | |
265 | sample = (struct sr_analog_sample *) | |
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 | } | |
275 | } | |
276 | ||
277 | packet.type = SR_DF_ANALOG; | |
278 | packet.length = count * sample_size; | |
279 | packet.unitsize = sample_size; | |
280 | packet.payload = outb; | |
281 | sr_session_bus(user_data, &packet); | |
282 | g_free(outb); | |
283 | alsa->limit_samples -= count; | |
284 | ||
285 | } while (alsa->limit_samples > 0); | |
286 | ||
287 | packet.type = SR_DF_END; | |
288 | sr_session_bus(user_data, &packet); | |
289 | ||
290 | return TRUE; | |
291 | } | |
292 | ||
293 | static int hw_start_acquisition(int dev_index, gpointer session_dev_id) | |
294 | { | |
295 | struct sr_dev_inst *sdi; | |
296 | struct alsa *alsa; | |
297 | struct sr_datafeed_packet packet; | |
298 | struct sr_datafeed_header header; | |
299 | struct pollfd *ufds; | |
300 | int count; | |
301 | int err; | |
302 | ||
303 | if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) | |
304 | return SR_ERR; | |
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) { | |
310 | sr_err("alsa: can't set access type (%s)", snd_strerror(err)); | |
311 | return SR_ERR; | |
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) { | |
318 | sr_err("alsa: can't set sample format (%s)", snd_strerror(err)); | |
319 | return SR_ERR; | |
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) { | |
325 | sr_err("alsa: can't set sample rate (%s)", snd_strerror(err)); | |
326 | return SR_ERR; | |
327 | } | |
328 | ||
329 | err = snd_pcm_hw_params_set_channels(alsa->capture_handle, | |
330 | alsa->hw_params, NUM_PROBES); | |
331 | if (err < 0) { | |
332 | sr_err("alsa: can't set channel count (%s)", snd_strerror(err)); | |
333 | return SR_ERR; | |
334 | } | |
335 | ||
336 | err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params); | |
337 | if (err < 0) { | |
338 | sr_err("alsa: can't set parameters (%s)", snd_strerror(err)); | |
339 | return SR_ERR; | |
340 | } | |
341 | ||
342 | err = snd_pcm_prepare(alsa->capture_handle); | |
343 | if (err < 0) { | |
344 | sr_err("alsa: can't prepare audio interface for use (%s)", | |
345 | snd_strerror(err)); | |
346 | return SR_ERR; | |
347 | } | |
348 | ||
349 | count = snd_pcm_poll_descriptors_count(alsa->capture_handle); | |
350 | if (count < 1) { | |
351 | sr_err("alsa: Unable to obtain poll descriptors count"); | |
352 | return SR_ERR; | |
353 | } | |
354 | ||
355 | if (!(ufds = g_try_malloc(count * sizeof(struct pollfd)))) { | |
356 | sr_err("alsa: %s: ufds malloc failed", __func__); | |
357 | return SR_ERR_MALLOC; | |
358 | } | |
359 | ||
360 | err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count); | |
361 | if (err < 0) { | |
362 | sr_err("alsa: Unable to obtain poll descriptors (%s)", | |
363 | snd_strerror(err)); | |
364 | g_free(ufds); | |
365 | return SR_ERR; | |
366 | } | |
367 | ||
368 | alsa->session_id = session_dev_id; | |
369 | sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi); | |
370 | ||
371 | packet.type = SR_DF_HEADER; | |
372 | packet.length = sizeof(struct sr_datafeed_header); | |
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; | |
379 | header.protocol_id = SR_PROTO_RAW; | |
380 | sr_session_bus(session_dev_id, &packet); | |
381 | g_free(ufds); | |
382 | ||
383 | return SR_OK; | |
384 | } | |
385 | ||
386 | static int hw_stop_acquisition(int dev_index, gpointer session_dev_id) | |
387 | { | |
388 | /* Avoid compiler warnings. */ | |
389 | dev_index = dev_index; | |
390 | session_dev_id = session_dev_id; | |
391 | ||
392 | return SR_OK; | |
393 | } | |
394 | ||
395 | SR_PRIV struct sr_dev_plugin alsa_plugin_info = { | |
396 | .name = "alsa", | |
397 | .longname = "ALSA driver", | |
398 | .api_version = 1, | |
399 | .init = hw_init, | |
400 | .cleanup = hw_cleanup, | |
401 | .opendev = hw_opendev, | |
402 | .closedev = hw_closedev, | |
403 | .get_dev_info = hw_get_dev_info, | |
404 | .get_status = hw_get_status, | |
405 | .hwcap_get_all = hw_hwcap_get_all, | |
406 | .config_set = hw_config_set, | |
407 | .start_acquisition = hw_start_acquisition, | |
408 | .stop_acquisition = hw_stop_acquisition, | |
409 | }; |