1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "usb_audio_hw"
18/*#define LOG_NDEBUG 0*/
19
20#include <errno.h>
21#include <pthread.h>
22#include <stdint.h>
23#include <sys/time.h>
24#include <stdlib.h>
25
26#include <cutils/log.h>
27#include <cutils/str_parms.h>
28#include <cutils/properties.h>
29
30#include <hardware/hardware.h>
31#include <system/audio.h>
32#include <hardware/audio.h>
33
34#include <tinyalsa/asoundlib.h>
35
36struct pcm_config pcm_config = {
37    .channels = 2,
38    .rate = 44100,
39    .period_size = 1024,
40    .period_count = 4,
41    .format = PCM_FORMAT_S16_LE,
42};
43
44struct audio_device {
45    struct audio_hw_device hw_device;
46
47    pthread_mutex_t lock; /* see note below on mutex acquisition order */
48    int card;
49    int device;
50    bool standby;
51};
52
53struct stream_out {
54    struct audio_stream_out stream;
55
56    pthread_mutex_t lock; /* see note below on mutex acquisition order */
57    struct pcm *pcm;
58    bool standby;
59
60    struct audio_device *dev;
61};
62
63/**
64 * NOTE: when multiple mutexes have to be acquired, always respect the
65 * following order: hw device > out stream
66 */
67
68/* Helper functions */
69
70/* must be called with hw device and output stream mutexes locked */
71static int start_output_stream(struct stream_out *out)
72{
73    struct audio_device *adev = out->dev;
74    int i;
75
76    if ((adev->card < 0) || (adev->device < 0))
77        return -EINVAL;
78
79    out->pcm = pcm_open(adev->card, adev->device, PCM_OUT, &pcm_config);
80
81    if (out->pcm && !pcm_is_ready(out->pcm)) {
82        ALOGE("pcm_open() failed: %s", pcm_get_error(out->pcm));
83        pcm_close(out->pcm);
84        return -ENOMEM;
85    }
86
87    return 0;
88}
89
90/* API functions */
91
92static uint32_t out_get_sample_rate(const struct audio_stream *stream)
93{
94    return pcm_config.rate;
95}
96
97static int out_set_sample_rate(struct audio_stream *stream, uint32_t rate)
98{
99    return 0;
100}
101
102static size_t out_get_buffer_size(const struct audio_stream *stream)
103{
104    return pcm_config.period_size *
105           audio_stream_frame_size((struct audio_stream *)stream);
106}
107
108static uint32_t out_get_channels(const struct audio_stream *stream)
109{
110    return AUDIO_CHANNEL_OUT_STEREO;
111}
112
113static audio_format_t out_get_format(const struct audio_stream *stream)
114{
115    return AUDIO_FORMAT_PCM_16_BIT;
116}
117
118static int out_set_format(struct audio_stream *stream, audio_format_t format)
119{
120    return 0;
121}
122
123static int out_standby(struct audio_stream *stream)
124{
125    struct stream_out *out = (struct stream_out *)stream;
126
127    pthread_mutex_lock(&out->dev->lock);
128    pthread_mutex_lock(&out->lock);
129
130    if (!out->standby) {
131        pcm_close(out->pcm);
132        out->pcm = NULL;
133        out->standby = true;
134    }
135
136    pthread_mutex_unlock(&out->lock);
137    pthread_mutex_unlock(&out->dev->lock);
138
139    return 0;
140}
141
142static int out_dump(const struct audio_stream *stream, int fd)
143{
144    return 0;
145}
146
147static int out_set_parameters(struct audio_stream *stream, const char *kvpairs)
148{
149    struct stream_out *out = (struct stream_out *)stream;
150    struct audio_device *adev = out->dev;
151    struct str_parms *parms;
152    char value[32];
153    int ret;
154    int routing = 0;
155
156    parms = str_parms_create_str(kvpairs);
157    pthread_mutex_lock(&adev->lock);
158
159    ret = str_parms_get_str(parms, "card", value, sizeof(value));
160    if (ret >= 0)
161        adev->card = atoi(value);
162
163    ret = str_parms_get_str(parms, "device", value, sizeof(value));
164    if (ret >= 0)
165        adev->device = atoi(value);
166
167    pthread_mutex_unlock(&adev->lock);
168    str_parms_destroy(parms);
169
170    return 0;
171}
172
173static char * out_get_parameters(const struct audio_stream *stream, const char *keys)
174{
175    return strdup("");
176}
177
178static uint32_t out_get_latency(const struct audio_stream_out *stream)
179{
180    return (pcm_config.period_size * pcm_config.period_count * 1000) /
181            out_get_sample_rate(&stream->common);
182}
183
184static int out_set_volume(struct audio_stream_out *stream, float left,
185                          float right)
186{
187    return -ENOSYS;
188}
189
190static ssize_t out_write(struct audio_stream_out *stream, const void* buffer,
191                         size_t bytes)
192{
193    int ret;
194    struct stream_out *out = (struct stream_out *)stream;
195
196    pthread_mutex_lock(&out->dev->lock);
197    pthread_mutex_lock(&out->lock);
198    if (out->standby) {
199        ret = start_output_stream(out);
200        if (ret != 0) {
201            goto err;
202        }
203        out->standby = false;
204    }
205
206    pcm_write(out->pcm, (void *)buffer, bytes);
207
208    pthread_mutex_unlock(&out->lock);
209    pthread_mutex_unlock(&out->dev->lock);
210
211    return bytes;
212
213err:
214    pthread_mutex_unlock(&out->lock);
215
216    if (ret != 0) {
217        usleep(bytes * 1000000 / audio_stream_frame_size(&stream->common) /
218               out_get_sample_rate(&stream->common));
219    }
220
221    return bytes;
222}
223
224static int out_get_render_position(const struct audio_stream_out *stream,
225                                   uint32_t *dsp_frames)
226{
227    return -EINVAL;
228}
229
230static int out_add_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
231{
232    return 0;
233}
234
235static int out_remove_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
236{
237    return 0;
238}
239
240static int out_get_next_write_timestamp(const struct audio_stream_out *stream,
241                                        int64_t *timestamp)
242{
243    return -EINVAL;
244}
245
246static int adev_open_output_stream(struct audio_hw_device *dev,
247                                   audio_io_handle_t handle,
248                                   audio_devices_t devices,
249                                   audio_output_flags_t flags,
250                                   struct audio_config *config,
251                                   struct audio_stream_out **stream_out)
252{
253    struct audio_device *adev = (struct audio_device *)dev;
254    struct stream_out *out;
255    int ret;
256
257    out = (struct stream_out *)calloc(1, sizeof(struct stream_out));
258    if (!out)
259        return -ENOMEM;
260
261    out->stream.common.get_sample_rate = out_get_sample_rate;
262    out->stream.common.set_sample_rate = out_set_sample_rate;
263    out->stream.common.get_buffer_size = out_get_buffer_size;
264    out->stream.common.get_channels = out_get_channels;
265    out->stream.common.get_format = out_get_format;
266    out->stream.common.set_format = out_set_format;
267    out->stream.common.standby = out_standby;
268    out->stream.common.dump = out_dump;
269    out->stream.common.set_parameters = out_set_parameters;
270    out->stream.common.get_parameters = out_get_parameters;
271    out->stream.common.add_audio_effect = out_add_audio_effect;
272    out->stream.common.remove_audio_effect = out_remove_audio_effect;
273    out->stream.get_latency = out_get_latency;
274    out->stream.set_volume = out_set_volume;
275    out->stream.write = out_write;
276    out->stream.get_render_position = out_get_render_position;
277    out->stream.get_next_write_timestamp = out_get_next_write_timestamp;
278
279    out->dev = adev;
280
281    config->format = out_get_format(&out->stream.common);
282    config->channel_mask = out_get_channels(&out->stream.common);
283    config->sample_rate = out_get_sample_rate(&out->stream.common);
284
285    out->standby = true;
286
287    adev->card = -1;
288    adev->device = -1;
289
290    *stream_out = &out->stream;
291    return 0;
292
293err_open:
294    free(out);
295    *stream_out = NULL;
296    return ret;
297}
298
299static void adev_close_output_stream(struct audio_hw_device *dev,
300                                     struct audio_stream_out *stream)
301{
302    struct stream_out *out = (struct stream_out *)stream;
303
304    out_standby(&stream->common);
305    free(stream);
306}
307
308static int adev_set_parameters(struct audio_hw_device *dev, const char *kvpairs)
309{
310    return 0;
311}
312
313static char * adev_get_parameters(const struct audio_hw_device *dev,
314                                  const char *keys)
315{
316    return strdup("");
317}
318
319static int adev_init_check(const struct audio_hw_device *dev)
320{
321    return 0;
322}
323
324static int adev_set_voice_volume(struct audio_hw_device *dev, float volume)
325{
326    return -ENOSYS;
327}
328
329static int adev_set_master_volume(struct audio_hw_device *dev, float volume)
330{
331    return -ENOSYS;
332}
333
334static int adev_set_mode(struct audio_hw_device *dev, audio_mode_t mode)
335{
336    return 0;
337}
338
339static int adev_set_mic_mute(struct audio_hw_device *dev, bool state)
340{
341    return -ENOSYS;
342}
343
344static int adev_get_mic_mute(const struct audio_hw_device *dev, bool *state)
345{
346    return -ENOSYS;
347}
348
349static size_t adev_get_input_buffer_size(const struct audio_hw_device *dev,
350                                         const struct audio_config *config)
351{
352    return 0;
353}
354
355static int adev_open_input_stream(struct audio_hw_device *dev,
356                                  audio_io_handle_t handle,
357                                  audio_devices_t devices,
358                                  struct audio_config *config,
359                                  struct audio_stream_in **stream_in)
360{
361    return -ENOSYS;
362}
363
364static void adev_close_input_stream(struct audio_hw_device *dev,
365                                   struct audio_stream_in *stream)
366{
367}
368
369static int adev_dump(const audio_hw_device_t *device, int fd)
370{
371    return 0;
372}
373
374static int adev_close(hw_device_t *device)
375{
376    struct audio_device *adev = (struct audio_device *)device;
377
378    free(device);
379    return 0;
380}
381
382static int adev_open(const hw_module_t* module, const char* name,
383                     hw_device_t** device)
384{
385    struct audio_device *adev;
386    int ret;
387
388    if (strcmp(name, AUDIO_HARDWARE_INTERFACE) != 0)
389        return -EINVAL;
390
391    adev = calloc(1, sizeof(struct audio_device));
392    if (!adev)
393        return -ENOMEM;
394
395    adev->hw_device.common.tag = HARDWARE_DEVICE_TAG;
396    adev->hw_device.common.version = AUDIO_DEVICE_API_VERSION_2_0;
397    adev->hw_device.common.module = (struct hw_module_t *) module;
398    adev->hw_device.common.close = adev_close;
399
400    adev->hw_device.init_check = adev_init_check;
401    adev->hw_device.set_voice_volume = adev_set_voice_volume;
402    adev->hw_device.set_master_volume = adev_set_master_volume;
403    adev->hw_device.set_mode = adev_set_mode;
404    adev->hw_device.set_mic_mute = adev_set_mic_mute;
405    adev->hw_device.get_mic_mute = adev_get_mic_mute;
406    adev->hw_device.set_parameters = adev_set_parameters;
407    adev->hw_device.get_parameters = adev_get_parameters;
408    adev->hw_device.get_input_buffer_size = adev_get_input_buffer_size;
409    adev->hw_device.open_output_stream = adev_open_output_stream;
410    adev->hw_device.close_output_stream = adev_close_output_stream;
411    adev->hw_device.open_input_stream = adev_open_input_stream;
412    adev->hw_device.close_input_stream = adev_close_input_stream;
413    adev->hw_device.dump = adev_dump;
414
415    *device = &adev->hw_device.common;
416
417    return 0;
418}
419
420static struct hw_module_methods_t hal_module_methods = {
421    .open = adev_open,
422};
423
424struct audio_module HAL_MODULE_INFO_SYM = {
425    .common = {
426        .tag = HARDWARE_MODULE_TAG,
427        .module_api_version = AUDIO_MODULE_API_VERSION_0_1,
428        .hal_api_version = HARDWARE_HAL_API_VERSION,
429        .id = AUDIO_HARDWARE_MODULE_ID,
430        .name = "USB audio HW HAL",
431        .author = "The Android Open Source Project",
432        .methods = &hal_module_methods,
433    },
434};
435