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6ed4f044 | 1 | /* |
6944b2d0 | 2 | * This file is part of the libsigrok project. |
6ed4f044 DR |
3 | * |
4 | * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com> | |
0254651d | 5 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> |
6944b2d0 | 6 | * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
6ed4f044 DR |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
9cd9f6b7 AG |
23 | #include <stdlib.h> |
24 | #include <unistd.h> | |
25 | #include <string.h> | |
721ecf3d UH |
26 | #include "libsigrok.h" |
27 | #include "libsigrok-internal.h" | |
28 | #include "protocol.h" | |
472bbb46 | 29 | |
915f7cc8 | 30 | static const int hwcaps[] = { |
1953564a BV |
31 | SR_CONF_SAMPLERATE, |
32 | SR_CONF_LIMIT_SAMPLES, | |
33 | SR_CONF_CONTINUOUS, | |
0254651d | 34 | 0, |
6ed4f044 DR |
35 | }; |
36 | ||
0254651d UH |
37 | SR_PRIV struct sr_dev_driver alsa_driver_info; |
38 | static struct sr_dev_driver *di = &alsa_driver_info; | |
6ed4f044 | 39 | |
0254651d UH |
40 | static int clear_instances(void) |
41 | { | |
6944b2d0 AG |
42 | struct drv_context *drvc; |
43 | ||
44 | if (!(drvc = di->priv)) | |
45 | return SR_OK; | |
46 | ||
47 | g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear); | |
48 | drvc->instances = NULL; | |
0254651d UH |
49 | |
50 | return SR_OK; | |
51 | } | |
52 | ||
34f06b90 | 53 | static int hw_init(struct sr_context *sr_ctx) |
6ed4f044 | 54 | { |
063e7aef | 55 | return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN); |
0254651d UH |
56 | } |
57 | ||
58 | static GSList *hw_scan(GSList *options) | |
59 | { | |
6944b2d0 | 60 | return alsa_scan(options, di); |
6ed4f044 DR |
61 | } |
62 | ||
0254651d | 63 | static GSList *hw_dev_list(void) |
6ed4f044 | 64 | { |
0e94d524 | 65 | return ((struct drv_context *)(di->priv))->instances; |
0254651d UH |
66 | } |
67 | ||
68 | static int hw_dev_open(struct sr_dev_inst *sdi) | |
69 | { | |
70 | struct dev_context *devc; | |
ebc34738 | 71 | int ret; |
6ed4f044 | 72 | |
0254651d | 73 | devc = sdi->priv; |
6ed4f044 | 74 | |
6944b2d0 AG |
75 | if (!(devc->hwdev)) { |
76 | sr_err("devc->hwdev was NULL."); | |
77 | return SR_ERR_BUG; | |
78 | } | |
79 | ||
80 | sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev); | |
81 | ret = snd_pcm_open(&devc->capture_handle, devc->hwdev, | |
ea9cfed7 | 82 | SND_PCM_STREAM_CAPTURE, 0); |
ebc34738 | 83 | if (ret < 0) { |
0254651d | 84 | sr_err("Can't open audio device: %s.", snd_strerror(ret)); |
e46b8fb1 | 85 | return SR_ERR; |
6ed4f044 DR |
86 | } |
87 | ||
0254651d UH |
88 | sr_dbg("Initializing hardware parameter structure."); |
89 | ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params); | |
ebc34738 | 90 | if (ret < 0) { |
0254651d | 91 | sr_err("Can't initialize hardware parameter structure: %s.", |
472bbb46 | 92 | snd_strerror(ret)); |
e46b8fb1 | 93 | return SR_ERR; |
6ed4f044 DR |
94 | } |
95 | ||
e46b8fb1 | 96 | return SR_OK; |
6ed4f044 DR |
97 | } |
98 | ||
0254651d | 99 | static int hw_dev_close(struct sr_dev_inst *sdi) |
6ed4f044 | 100 | { |
0254651d UH |
101 | int ret; |
102 | struct dev_context *devc; | |
6ed4f044 | 103 | |
0254651d UH |
104 | devc = sdi->priv; |
105 | ||
106 | sr_dbg("Closing device."); | |
6ed4f044 | 107 | |
0254651d UH |
108 | if (devc->capture_handle) { |
109 | sr_dbg("Closing PCM device."); | |
110 | if ((ret = snd_pcm_close(devc->capture_handle)) < 0) { | |
111 | sr_err("Failed to close device: %s.", | |
112 | snd_strerror(ret)); | |
6944b2d0 | 113 | devc->capture_handle = NULL; |
0254651d UH |
114 | } |
115 | } else { | |
116 | sr_dbg("No capture handle, no need to close audio device."); | |
117 | } | |
697785d1 UH |
118 | |
119 | return SR_OK; | |
6ed4f044 DR |
120 | } |
121 | ||
57ab7d9f | 122 | static int hw_cleanup(void) |
6ed4f044 | 123 | { |
0254651d | 124 | clear_instances(); |
57ab7d9f UH |
125 | |
126 | return SR_OK; | |
6ed4f044 DR |
127 | } |
128 | ||
035a1078 | 129 | static int config_get(int id, const void **data, const struct sr_dev_inst *sdi) |
6ed4f044 | 130 | { |
0254651d | 131 | struct dev_context *devc; |
6ed4f044 | 132 | |
035a1078 | 133 | switch (id) { |
123e1313 | 134 | case SR_CONF_SAMPLERATE: |
9a6517d1 | 135 | devc = sdi->priv; |
0254651d | 136 | *data = &devc->cur_samplerate; |
6ed4f044 | 137 | break; |
0254651d | 138 | default: |
0254651d | 139 | return SR_ERR_ARG; |
6ed4f044 DR |
140 | } |
141 | ||
0254651d | 142 | return SR_OK; |
6ed4f044 DR |
143 | } |
144 | ||
035a1078 | 145 | static int config_set(int id, const void *value, const struct sr_dev_inst *sdi) |
6ed4f044 | 146 | { |
0254651d | 147 | struct dev_context *devc; |
6ed4f044 | 148 | |
0254651d | 149 | devc = sdi->priv; |
6ed4f044 | 150 | |
035a1078 | 151 | switch (id) { |
1953564a | 152 | case SR_CONF_SAMPLERATE: |
65faa197 | 153 | alsa_set_samplerate(sdi, *(const uint64_t *)value); |
0254651d | 154 | break; |
1953564a | 155 | case SR_CONF_LIMIT_SAMPLES: |
0254651d UH |
156 | devc->limit_samples = *(const uint64_t *)value; |
157 | break; | |
6ed4f044 | 158 | default: |
035a1078 | 159 | sr_err("Unknown capability: %d.", id); |
e46b8fb1 | 160 | return SR_ERR; |
6ed4f044 | 161 | } |
0254651d UH |
162 | |
163 | return SR_OK; | |
6ed4f044 DR |
164 | } |
165 | ||
a1c743fc BV |
166 | static int config_list(int key, const void **data, const struct sr_dev_inst *sdi) |
167 | { | |
168 | struct dev_context *devc; | |
169 | ||
170 | (void)sdi; | |
171 | ||
172 | switch (key) { | |
9a6517d1 BV |
173 | case SR_CONF_DEVICE_OPTIONS: |
174 | *data = hwcaps; | |
175 | break; | |
a1c743fc BV |
176 | case SR_CONF_SAMPLERATE: |
177 | if (!sdi || !sdi->priv) | |
178 | return SR_ERR_ARG; | |
179 | devc = sdi->priv; | |
180 | if (!devc->supp_rates.list) { | |
181 | sr_err("Instance did not contain a samplerate list."); | |
182 | return SR_ERR_ARG; | |
183 | } | |
184 | *data = &devc->supp_rates; | |
185 | break; | |
186 | default: | |
187 | return SR_ERR_ARG; | |
188 | } | |
189 | ||
190 | return SR_OK; | |
191 | } | |
192 | ||
0254651d UH |
193 | static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi, |
194 | void *cb_data) | |
6ed4f044 | 195 | { |
b9c735a2 UH |
196 | struct sr_datafeed_packet packet; |
197 | struct sr_datafeed_header header; | |
0254651d UH |
198 | struct dev_context *devc; |
199 | int count, ret; | |
721ecf3d | 200 | char *endianness; |
6ed4f044 | 201 | |
0254651d UH |
202 | devc = sdi->priv; |
203 | devc->cb_data = cb_data; | |
729850c9 | 204 | devc->num_samples = 0; |
6ed4f044 | 205 | |
0254651d UH |
206 | sr_dbg("Setting audio access type to RW/interleaved."); |
207 | ret = snd_pcm_hw_params_set_access(devc->capture_handle, | |
208 | devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
ebc34738 | 209 | if (ret < 0) { |
0254651d | 210 | sr_err("Can't set audio access type: %s.", snd_strerror(ret)); |
e46b8fb1 | 211 | return SR_ERR; |
6ed4f044 DR |
212 | } |
213 | ||
0254651d | 214 | /* FIXME: Hardcoded for 16bits. */ |
729850c9 | 215 | if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE) |
721ecf3d | 216 | endianness = "little endian"; |
729850c9 | 217 | else |
721ecf3d UH |
218 | endianness = "big endian"; |
219 | sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness); | |
0254651d | 220 | ret = snd_pcm_hw_params_set_format(devc->capture_handle, |
729850c9 AG |
221 | devc->hw_params, |
222 | SND_PCM_FORMAT_S16); | |
ebc34738 | 223 | if (ret < 0) { |
0254651d | 224 | sr_err("Can't set audio sample format: %s.", snd_strerror(ret)); |
e46b8fb1 | 225 | return SR_ERR; |
6ed4f044 DR |
226 | } |
227 | ||
0254651d UH |
228 | sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.", |
229 | devc->cur_samplerate); | |
0d6ff103 AG |
230 | ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params, |
231 | (unsigned int)devc->cur_samplerate, 0); | |
ebc34738 | 232 | if (ret < 0) { |
0254651d | 233 | sr_err("Can't set audio sample rate: %s.", snd_strerror(ret)); |
e46b8fb1 | 234 | return SR_ERR; |
6ed4f044 DR |
235 | } |
236 | ||
9cd9f6b7 | 237 | sr_dbg("Setting audio channel count to %d.", devc->num_probes); |
0254651d | 238 | ret = snd_pcm_hw_params_set_channels(devc->capture_handle, |
9cd9f6b7 | 239 | devc->hw_params, devc->num_probes); |
ebc34738 | 240 | if (ret < 0) { |
0254651d | 241 | sr_err("Can't set channel count: %s.", snd_strerror(ret)); |
e46b8fb1 | 242 | return SR_ERR; |
6ed4f044 DR |
243 | } |
244 | ||
0254651d UH |
245 | sr_dbg("Setting audio parameters."); |
246 | ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params); | |
ebc34738 | 247 | if (ret < 0) { |
0254651d | 248 | sr_err("Can't set parameters: %s.", snd_strerror(ret)); |
e46b8fb1 | 249 | return SR_ERR; |
6ed4f044 DR |
250 | } |
251 | ||
0254651d UH |
252 | sr_dbg("Preparing audio interface for use."); |
253 | ret = snd_pcm_prepare(devc->capture_handle); | |
ebc34738 | 254 | if (ret < 0) { |
0254651d | 255 | sr_err("Can't prepare audio interface for use: %s.", |
ebc34738 | 256 | snd_strerror(ret)); |
e46b8fb1 | 257 | return SR_ERR; |
6ed4f044 DR |
258 | } |
259 | ||
0254651d | 260 | count = snd_pcm_poll_descriptors_count(devc->capture_handle); |
6ed4f044 | 261 | if (count < 1) { |
472bbb46 | 262 | sr_err("Unable to obtain poll descriptors count."); |
e46b8fb1 | 263 | return SR_ERR; |
6ed4f044 DR |
264 | } |
265 | ||
0254651d UH |
266 | if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) { |
267 | sr_err("Failed to malloc ufds."); | |
e46b8fb1 | 268 | return SR_ERR_MALLOC; |
92b3101c | 269 | } |
6ed4f044 | 270 | |
3d6de074 | 271 | sr_spew("Getting %d poll descriptors.", count); |
0254651d | 272 | ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count); |
ebc34738 | 273 | if (ret < 0) { |
0254651d | 274 | sr_err("Unable to obtain poll descriptors: %s.", |
ebc34738 | 275 | snd_strerror(ret)); |
0254651d | 276 | g_free(devc->ufds); |
e46b8fb1 | 277 | return SR_ERR; |
6ed4f044 DR |
278 | } |
279 | ||
0254651d UH |
280 | /* Send header packet to the session bus. */ |
281 | sr_dbg("Sending SR_DF_HEADER packet."); | |
5a2326a7 | 282 | packet.type = SR_DF_HEADER; |
0254651d | 283 | packet.payload = (uint8_t *)&header; |
6ed4f044 DR |
284 | header.feed_version = 1; |
285 | gettimeofday(&header.starttime, NULL); | |
0254651d UH |
286 | sr_session_send(devc->cb_data, &packet); |
287 | ||
0254651d UH |
288 | /* Poll every 10ms, or whenever some data comes in. */ |
289 | sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10, | |
9cd9f6b7 | 290 | alsa_receive_data, (void *)sdi); |
0254651d UH |
291 | |
292 | // g_free(devc->ufds); /* FIXME */ | |
6ed4f044 | 293 | |
e46b8fb1 | 294 | return SR_OK; |
6ed4f044 DR |
295 | } |
296 | ||
0254651d | 297 | static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) |
6ed4f044 | 298 | { |
0254651d UH |
299 | struct sr_datafeed_packet packet; |
300 | struct dev_context *devc; | |
301 | ||
302 | devc = sdi->priv; | |
303 | devc->cb_data = cb_data; | |
304 | ||
305 | sr_source_remove(devc->ufds[0].fd); | |
306 | ||
307 | /* Send end packet to the session bus. */ | |
308 | sr_dbg("Sending SR_DF_END packet."); | |
309 | packet.type = SR_DF_END; | |
310 | sr_session_send(cb_data, &packet); | |
3010f21c UH |
311 | |
312 | return SR_OK; | |
6ed4f044 DR |
313 | } |
314 | ||
c09f0b57 | 315 | SR_PRIV struct sr_dev_driver alsa_driver_info = { |
e519ba86 UH |
316 | .name = "alsa", |
317 | .longname = "ALSA driver", | |
318 | .api_version = 1, | |
319 | .init = hw_init, | |
320 | .cleanup = hw_cleanup, | |
0254651d UH |
321 | .scan = hw_scan, |
322 | .dev_list = hw_dev_list, | |
323 | .dev_clear = clear_instances, | |
035a1078 BV |
324 | .config_get = config_get, |
325 | .config_set = config_set, | |
a1c743fc | 326 | .config_list = config_list, |
e7eb703f UH |
327 | .dev_open = hw_dev_open, |
328 | .dev_close = hw_dev_close, | |
69040b7c UH |
329 | .dev_acquisition_start = hw_dev_acquisition_start, |
330 | .dev_acquisition_stop = hw_dev_acquisition_stop, | |
0254651d | 331 | .priv = NULL, |
6ed4f044 | 332 | }; |