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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 | #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[] = { | |
33 | HWCAP_SAMPLERATE, | |
34 | HWCAP_LIMIT_SAMPLES, | |
35 | HWCAP_CONTINUOUS, | |
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 | ||
48 | static int hw_init(char *deviceinfo) | |
49 | { | |
50 | struct sigrok_device_instance *sdi; | |
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 | ||
61 | sdi = sigrok_device_instance_new(0, ST_ACTIVE, "alsa", NULL, NULL); | |
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 | { | |
77 | struct sigrok_device_instance *sdi; | |
78 | struct alsa *alsa; | |
79 | int err; | |
80 | ||
81 | if (!(sdi = get_sigrok_device_instance(device_instances, 0))) | |
82 | return SIGROK_ERR; | |
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)); | |
90 | return SIGROK_ERR; | |
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)); | |
97 | return SIGROK_ERR; | |
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)); | |
104 | return SIGROK_ERR; | |
105 | } | |
106 | ||
107 | return SIGROK_OK; | |
108 | } | |
109 | ||
110 | static void hw_closedev(int device_index) | |
111 | { | |
112 | struct sigrok_device_instance *sdi; | |
113 | struct alsa *alsa; | |
114 | ||
115 | if (!(sdi = get_sigrok_device_instance(device_instances, 0))) | |
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 | { | |
129 | struct sigrok_device_instance *sdi; | |
130 | ||
131 | if (!(sdi = get_sigrok_device_instance(device_instances, 0))) | |
132 | return; | |
133 | ||
134 | free(sdi->priv); | |
135 | sigrok_device_instance_free(sdi); | |
136 | } | |
137 | ||
138 | static void *hw_get_device_info(int device_index, int device_info_id) | |
139 | { | |
140 | struct sigrok_device_instance *sdi; | |
141 | struct alsa *alsa; | |
142 | void *info = NULL; | |
143 | ||
144 | if (!(sdi = get_sigrok_device_instance(device_instances, device_index))) | |
145 | return NULL; | |
146 | alsa = sdi->priv; | |
147 | ||
148 | switch (device_info_id) { | |
149 | case DI_INSTANCE: | |
150 | info = sdi; | |
151 | break; | |
152 | case DI_NUM_PROBES: | |
153 | info = GINT_TO_POINTER(NUM_PROBES); | |
154 | break; | |
155 | case DI_CUR_SAMPLERATE: | |
156 | info = &alsa->cur_rate; | |
157 | break; | |
158 | case DI_PROBE_TYPE: | |
159 | info = GINT_TO_POINTER(PROBE_TYPE_ANALOG); | |
160 | break; | |
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 | ||
171 | return ST_ACTIVE; | |
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 | { | |
181 | struct sigrok_device_instance *sdi; | |
182 | struct alsa *alsa; | |
183 | ||
184 | if (!(sdi = get_sigrok_device_instance(device_instances, device_index))) | |
185 | return SIGROK_ERR; | |
186 | alsa = sdi->priv; | |
187 | ||
188 | switch (capability) { | |
189 | case HWCAP_PROBECONFIG: | |
190 | return SIGROK_OK; | |
191 | case HWCAP_SAMPLERATE: | |
192 | alsa->cur_rate = *(uint64_t *) value; | |
193 | return SIGROK_OK; | |
194 | case HWCAP_LIMIT_SAMPLES: | |
195 | alsa->limit_samples = *(uint64_t *) value; | |
196 | return SIGROK_OK; | |
197 | default: | |
198 | return SIGROK_ERR; | |
199 | } | |
200 | } | |
201 | ||
202 | /* | |
203 | * FIXME: This is incomplete, i couldn't get poll() to work with alsa fds yet. | |
204 | */ | |
205 | static int receive_data(int fd, int revents, void *user_data) | |
206 | { | |
207 | struct sigrok_device_instance *sdi = user_data; | |
208 | struct alsa *alsa = sdi->priv; | |
209 | struct datafeed_packet packet; | |
210 | char buf[128]; | |
211 | int i, err; | |
212 | ||
213 | g_warning("entered receive_data"); | |
214 | ||
215 | for (i = 0; i < 10; i++) { | |
216 | if ((err = snd_pcm_readi(alsa->capture_handle, buf, 128)) != 128) { | |
217 | g_warning("read from audio interface failed (%s)\n", | |
218 | snd_strerror(err)); | |
219 | return FALSE; | |
220 | } | |
221 | g_warning("data read ok"); | |
222 | } | |
223 | ||
224 | return TRUE; | |
225 | } | |
226 | ||
227 | static int hw_start_acquisition(int device_index, gpointer session_device_id) | |
228 | { | |
229 | struct sigrok_device_instance *sdi; | |
230 | struct alsa *alsa; | |
231 | struct datafeed_packet packet; | |
232 | struct datafeed_header header; | |
233 | struct pollfd *ufds; | |
234 | int count; | |
235 | int err; | |
236 | ||
237 | if (!(sdi = get_sigrok_device_instance(device_instances, device_index))) | |
238 | return SIGROK_ERR; | |
239 | alsa = sdi->priv; | |
240 | ||
241 | err = snd_pcm_hw_params_set_access(alsa->capture_handle, | |
242 | alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
243 | if (err < 0) { | |
244 | g_warning("cannot set access type (%s)", snd_strerror(err)); | |
245 | return SIGROK_ERR; | |
246 | } | |
247 | ||
248 | /* FIXME: Hardcoded for 16bits */ | |
249 | err = snd_pcm_hw_params_set_format(alsa->capture_handle, | |
250 | alsa->hw_params, SND_PCM_FORMAT_S16_LE); | |
251 | if (err < 0) { | |
252 | g_warning("cannot set sample format (%s)", snd_strerror(err)); | |
253 | return SIGROK_ERR; | |
254 | } | |
255 | ||
256 | err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle, | |
257 | alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0); | |
258 | if (err < 0) { | |
259 | g_warning("cannot set sample rate (%s)", snd_strerror(err)); | |
260 | return SIGROK_ERR; | |
261 | } | |
262 | ||
263 | err = snd_pcm_hw_params_set_channels(alsa->capture_handle, | |
264 | alsa->hw_params, NUM_PROBES); | |
265 | if (err < 0) { | |
266 | g_warning("cannot set channel count (%s)", snd_strerror(err)); | |
267 | return SIGROK_ERR; | |
268 | } | |
269 | ||
270 | err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params); | |
271 | if (err < 0) { | |
272 | g_warning("cannot set parameters (%s)", snd_strerror(err)); | |
273 | return SIGROK_ERR; | |
274 | } | |
275 | ||
276 | err = snd_pcm_prepare(alsa->capture_handle); | |
277 | if (err < 0) { | |
278 | g_warning("cannot prepare audio interface for use (%s)", | |
279 | snd_strerror(err)); | |
280 | return SIGROK_ERR; | |
281 | } | |
282 | ||
283 | count = snd_pcm_poll_descriptors_count(alsa->capture_handle); | |
284 | if (count < 1) { | |
285 | g_warning("Unable to obtain poll descriptors count"); | |
286 | return SIGROK_ERR; | |
287 | } | |
288 | ||
289 | ufds = malloc(count * sizeof(struct pollfd)); | |
290 | if (!ufds) | |
291 | return SIGROK_ERR_MALLOC; | |
292 | ||
293 | err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count); | |
294 | if (err < 0) { | |
295 | g_warning("Unable to obtain poll descriptors (%s)", | |
296 | snd_strerror(err)); | |
297 | free(ufds); | |
298 | return SIGROK_ERR; | |
299 | } | |
300 | ||
301 | alsa->session_id = session_device_id; | |
302 | source_add(ufds[0].fd, ufds[0].revents, -1, receive_data, sdi); | |
303 | ||
304 | packet.type = DF_HEADER; | |
305 | packet.length = sizeof(struct datafeed_header); | |
306 | packet.payload = (unsigned char *) &header; | |
307 | header.feed_version = 1; | |
308 | gettimeofday(&header.starttime, NULL); | |
309 | header.samplerate = alsa->cur_rate; | |
310 | header.num_analog_probes = NUM_PROBES; | |
311 | header.num_logic_probes = 0; | |
312 | header.protocol_id = PROTO_RAW; | |
313 | session_bus(session_device_id, &packet); | |
314 | free(ufds); | |
315 | ||
316 | return SIGROK_OK; | |
317 | } | |
318 | ||
319 | static void hw_stop_acquisition(int device_index, gpointer session_device_id) | |
320 | { | |
321 | /* Avoid compiler warnings. */ | |
322 | device_index = device_index; | |
323 | session_device_id = session_device_id; | |
324 | } | |
325 | ||
326 | struct device_plugin alsa_plugin_info = { | |
327 | "alsa", | |
328 | 1, | |
329 | hw_init, | |
330 | hw_cleanup, | |
331 | hw_opendev, | |
332 | hw_closedev, | |
333 | hw_get_device_info, | |
334 | hw_get_status, | |
335 | hw_get_capabilities, | |
336 | hw_set_configuration, | |
337 | hw_start_acquisition, | |
338 | hw_stop_acquisition, | |
339 | }; |