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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 | { |
0254651d | 55 | struct drv_context *drvc; |
6ed4f044 | 56 | |
0254651d UH |
57 | if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) { |
58 | sr_err("Driver context malloc failed."); | |
886a52b6 | 59 | return SR_ERR_MALLOC; |
92b3101c | 60 | } |
6ed4f044 | 61 | |
0254651d UH |
62 | drvc->sr_ctx = sr_ctx; |
63 | di->priv = drvc; | |
64 | ||
65 | return SR_OK; | |
66 | } | |
67 | ||
68 | static GSList *hw_scan(GSList *options) | |
69 | { | |
6944b2d0 | 70 | return alsa_scan(options, di); |
6ed4f044 DR |
71 | } |
72 | ||
0254651d | 73 | static GSList *hw_dev_list(void) |
6ed4f044 | 74 | { |
0254651d UH |
75 | struct drv_context *drvc; |
76 | ||
77 | drvc = di->priv; | |
78 | ||
79 | return drvc->instances; | |
80 | } | |
81 | ||
82 | static int hw_dev_open(struct sr_dev_inst *sdi) | |
83 | { | |
84 | struct dev_context *devc; | |
ebc34738 | 85 | int ret; |
6ed4f044 | 86 | |
0254651d | 87 | devc = sdi->priv; |
6ed4f044 | 88 | |
6944b2d0 AG |
89 | if (!(devc->hwdev)) { |
90 | sr_err("devc->hwdev was NULL."); | |
91 | return SR_ERR_BUG; | |
92 | } | |
93 | ||
94 | sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev); | |
95 | ret = snd_pcm_open(&devc->capture_handle, devc->hwdev, | |
ea9cfed7 | 96 | SND_PCM_STREAM_CAPTURE, 0); |
ebc34738 | 97 | if (ret < 0) { |
0254651d | 98 | sr_err("Can't open audio device: %s.", snd_strerror(ret)); |
e46b8fb1 | 99 | return SR_ERR; |
6ed4f044 DR |
100 | } |
101 | ||
0254651d UH |
102 | sr_dbg("Initializing hardware parameter structure."); |
103 | ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params); | |
ebc34738 | 104 | if (ret < 0) { |
0254651d | 105 | sr_err("Can't initialize hardware parameter structure: %s.", |
472bbb46 | 106 | snd_strerror(ret)); |
e46b8fb1 | 107 | return SR_ERR; |
6ed4f044 DR |
108 | } |
109 | ||
e46b8fb1 | 110 | return SR_OK; |
6ed4f044 DR |
111 | } |
112 | ||
0254651d | 113 | static int hw_dev_close(struct sr_dev_inst *sdi) |
6ed4f044 | 114 | { |
0254651d UH |
115 | int ret; |
116 | struct dev_context *devc; | |
6ed4f044 | 117 | |
0254651d UH |
118 | devc = sdi->priv; |
119 | ||
120 | sr_dbg("Closing device."); | |
6ed4f044 | 121 | |
0254651d UH |
122 | if (devc->capture_handle) { |
123 | sr_dbg("Closing PCM device."); | |
124 | if ((ret = snd_pcm_close(devc->capture_handle)) < 0) { | |
125 | sr_err("Failed to close device: %s.", | |
126 | snd_strerror(ret)); | |
6944b2d0 | 127 | devc->capture_handle = NULL; |
0254651d UH |
128 | } |
129 | } else { | |
130 | sr_dbg("No capture handle, no need to close audio device."); | |
131 | } | |
697785d1 UH |
132 | |
133 | return SR_OK; | |
6ed4f044 DR |
134 | } |
135 | ||
57ab7d9f | 136 | static int hw_cleanup(void) |
6ed4f044 | 137 | { |
0254651d | 138 | clear_instances(); |
57ab7d9f UH |
139 | |
140 | return SR_OK; | |
6ed4f044 DR |
141 | } |
142 | ||
035a1078 | 143 | static int config_get(int id, const void **data, const struct sr_dev_inst *sdi) |
6ed4f044 | 144 | { |
0254651d | 145 | struct dev_context *devc; |
6ed4f044 | 146 | |
035a1078 | 147 | if (id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */ |
0254651d | 148 | devc = sdi->priv; |
6ed4f044 | 149 | |
035a1078 | 150 | switch (id) { |
0254651d UH |
151 | case SR_DI_HWCAPS: |
152 | *data = hwcaps; | |
6ed4f044 | 153 | break; |
5a2326a7 | 154 | case SR_DI_CUR_SAMPLERATE: |
0254651d | 155 | *data = &devc->cur_samplerate; |
6ed4f044 | 156 | break; |
65faa197 AG |
157 | case SR_DI_SAMPLERATES: |
158 | if (!devc->supp_rates.list) { | |
721ecf3d | 159 | sr_err("Instance did not contain a samplerate list."); |
65faa197 AG |
160 | return SR_ERR_ARG; |
161 | } | |
162 | *data = &devc->supp_rates; | |
163 | break; | |
0254651d | 164 | default: |
0254651d | 165 | return SR_ERR_ARG; |
6ed4f044 DR |
166 | } |
167 | ||
0254651d | 168 | return SR_OK; |
6ed4f044 DR |
169 | } |
170 | ||
035a1078 | 171 | static int config_set(int id, const void *value, const struct sr_dev_inst *sdi) |
6ed4f044 | 172 | { |
0254651d | 173 | struct dev_context *devc; |
6ed4f044 | 174 | |
0254651d | 175 | devc = sdi->priv; |
6ed4f044 | 176 | |
035a1078 | 177 | switch (id) { |
1953564a | 178 | case SR_CONF_SAMPLERATE: |
65faa197 | 179 | alsa_set_samplerate(sdi, *(const uint64_t *)value); |
0254651d | 180 | break; |
1953564a | 181 | case SR_CONF_LIMIT_SAMPLES: |
0254651d UH |
182 | devc->limit_samples = *(const uint64_t *)value; |
183 | break; | |
6ed4f044 | 184 | default: |
035a1078 | 185 | sr_err("Unknown capability: %d.", id); |
e46b8fb1 | 186 | return SR_ERR; |
6ed4f044 | 187 | } |
0254651d UH |
188 | |
189 | return SR_OK; | |
6ed4f044 DR |
190 | } |
191 | ||
0254651d UH |
192 | static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi, |
193 | void *cb_data) | |
6ed4f044 | 194 | { |
b9c735a2 UH |
195 | struct sr_datafeed_packet packet; |
196 | struct sr_datafeed_header header; | |
0254651d UH |
197 | struct dev_context *devc; |
198 | int count, ret; | |
721ecf3d | 199 | char *endianness; |
6ed4f044 | 200 | |
0254651d UH |
201 | devc = sdi->priv; |
202 | devc->cb_data = cb_data; | |
729850c9 | 203 | devc->num_samples = 0; |
6ed4f044 | 204 | |
0254651d UH |
205 | sr_dbg("Setting audio access type to RW/interleaved."); |
206 | ret = snd_pcm_hw_params_set_access(devc->capture_handle, | |
207 | devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
ebc34738 | 208 | if (ret < 0) { |
0254651d | 209 | sr_err("Can't set audio access type: %s.", snd_strerror(ret)); |
e46b8fb1 | 210 | return SR_ERR; |
6ed4f044 DR |
211 | } |
212 | ||
0254651d | 213 | /* FIXME: Hardcoded for 16bits. */ |
729850c9 | 214 | if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE) |
721ecf3d | 215 | endianness = "little endian"; |
729850c9 | 216 | else |
721ecf3d UH |
217 | endianness = "big endian"; |
218 | sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness); | |
0254651d | 219 | ret = snd_pcm_hw_params_set_format(devc->capture_handle, |
729850c9 AG |
220 | devc->hw_params, |
221 | SND_PCM_FORMAT_S16); | |
ebc34738 | 222 | if (ret < 0) { |
0254651d | 223 | sr_err("Can't set audio sample format: %s.", snd_strerror(ret)); |
e46b8fb1 | 224 | return SR_ERR; |
6ed4f044 DR |
225 | } |
226 | ||
0254651d UH |
227 | sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.", |
228 | devc->cur_samplerate); | |
0d6ff103 AG |
229 | ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params, |
230 | (unsigned int)devc->cur_samplerate, 0); | |
ebc34738 | 231 | if (ret < 0) { |
0254651d | 232 | sr_err("Can't set audio sample rate: %s.", snd_strerror(ret)); |
e46b8fb1 | 233 | return SR_ERR; |
6ed4f044 DR |
234 | } |
235 | ||
9cd9f6b7 | 236 | sr_dbg("Setting audio channel count to %d.", devc->num_probes); |
0254651d | 237 | ret = snd_pcm_hw_params_set_channels(devc->capture_handle, |
9cd9f6b7 | 238 | devc->hw_params, devc->num_probes); |
ebc34738 | 239 | if (ret < 0) { |
0254651d | 240 | sr_err("Can't set channel count: %s.", snd_strerror(ret)); |
e46b8fb1 | 241 | return SR_ERR; |
6ed4f044 DR |
242 | } |
243 | ||
0254651d UH |
244 | sr_dbg("Setting audio parameters."); |
245 | ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params); | |
ebc34738 | 246 | if (ret < 0) { |
0254651d | 247 | sr_err("Can't set parameters: %s.", snd_strerror(ret)); |
e46b8fb1 | 248 | return SR_ERR; |
6ed4f044 DR |
249 | } |
250 | ||
0254651d UH |
251 | sr_dbg("Preparing audio interface for use."); |
252 | ret = snd_pcm_prepare(devc->capture_handle); | |
ebc34738 | 253 | if (ret < 0) { |
0254651d | 254 | sr_err("Can't prepare audio interface for use: %s.", |
ebc34738 | 255 | snd_strerror(ret)); |
e46b8fb1 | 256 | return SR_ERR; |
6ed4f044 DR |
257 | } |
258 | ||
0254651d | 259 | count = snd_pcm_poll_descriptors_count(devc->capture_handle); |
6ed4f044 | 260 | if (count < 1) { |
472bbb46 | 261 | sr_err("Unable to obtain poll descriptors count."); |
e46b8fb1 | 262 | return SR_ERR; |
6ed4f044 DR |
263 | } |
264 | ||
0254651d UH |
265 | if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) { |
266 | sr_err("Failed to malloc ufds."); | |
e46b8fb1 | 267 | return SR_ERR_MALLOC; |
92b3101c | 268 | } |
6ed4f044 | 269 | |
3d6de074 | 270 | sr_spew("Getting %d poll descriptors.", count); |
0254651d | 271 | ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count); |
ebc34738 | 272 | if (ret < 0) { |
0254651d | 273 | sr_err("Unable to obtain poll descriptors: %s.", |
ebc34738 | 274 | snd_strerror(ret)); |
0254651d | 275 | g_free(devc->ufds); |
e46b8fb1 | 276 | return SR_ERR; |
6ed4f044 DR |
277 | } |
278 | ||
0254651d UH |
279 | /* Send header packet to the session bus. */ |
280 | sr_dbg("Sending SR_DF_HEADER packet."); | |
5a2326a7 | 281 | packet.type = SR_DF_HEADER; |
0254651d | 282 | packet.payload = (uint8_t *)&header; |
6ed4f044 DR |
283 | header.feed_version = 1; |
284 | gettimeofday(&header.starttime, NULL); | |
0254651d UH |
285 | sr_session_send(devc->cb_data, &packet); |
286 | ||
0254651d UH |
287 | /* Poll every 10ms, or whenever some data comes in. */ |
288 | sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10, | |
9cd9f6b7 | 289 | alsa_receive_data, (void *)sdi); |
0254651d UH |
290 | |
291 | // g_free(devc->ufds); /* FIXME */ | |
6ed4f044 | 292 | |
e46b8fb1 | 293 | return SR_OK; |
6ed4f044 DR |
294 | } |
295 | ||
0254651d | 296 | static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) |
6ed4f044 | 297 | { |
0254651d UH |
298 | struct sr_datafeed_packet packet; |
299 | struct dev_context *devc; | |
300 | ||
301 | devc = sdi->priv; | |
302 | devc->cb_data = cb_data; | |
303 | ||
304 | sr_source_remove(devc->ufds[0].fd); | |
305 | ||
306 | /* Send end packet to the session bus. */ | |
307 | sr_dbg("Sending SR_DF_END packet."); | |
308 | packet.type = SR_DF_END; | |
309 | sr_session_send(cb_data, &packet); | |
3010f21c UH |
310 | |
311 | return SR_OK; | |
6ed4f044 DR |
312 | } |
313 | ||
c09f0b57 | 314 | SR_PRIV struct sr_dev_driver alsa_driver_info = { |
e519ba86 UH |
315 | .name = "alsa", |
316 | .longname = "ALSA driver", | |
317 | .api_version = 1, | |
318 | .init = hw_init, | |
319 | .cleanup = hw_cleanup, | |
0254651d UH |
320 | .scan = hw_scan, |
321 | .dev_list = hw_dev_list, | |
322 | .dev_clear = clear_instances, | |
035a1078 BV |
323 | .config_get = config_get, |
324 | .config_set = config_set, | |
e7eb703f UH |
325 | .dev_open = hw_dev_open, |
326 | .dev_close = hw_dev_close, | |
69040b7c UH |
327 | .dev_acquisition_start = hw_dev_acquisition_start, |
328 | .dev_acquisition_stop = hw_dev_acquisition_stop, | |
0254651d | 329 | .priv = NULL, |
6ed4f044 | 330 | }; |