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Linux/sound/firewire/tascam/tascam-pcm.c

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  1 /*
  2  * tascam-pcm.c - a part of driver for TASCAM FireWire series
  3  *
  4  * Copyright (c) 2015 Takashi Sakamoto
  5  *
  6  * Licensed under the terms of the GNU General Public License, version 2.
  7  */
  8 
  9 #include "tascam.h"
 10 
 11 static int pcm_init_hw_params(struct snd_tscm *tscm,
 12                               struct snd_pcm_substream *substream)
 13 {
 14         struct snd_pcm_runtime *runtime = substream->runtime;
 15         struct snd_pcm_hardware *hw = &runtime->hw;
 16         struct amdtp_stream *stream;
 17         unsigned int pcm_channels;
 18 
 19         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 20                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 21                 stream = &tscm->tx_stream;
 22                 pcm_channels = tscm->spec->pcm_capture_analog_channels;
 23         } else {
 24                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 25                 stream = &tscm->rx_stream;
 26                 pcm_channels = tscm->spec->pcm_playback_analog_channels;
 27         }
 28 
 29         if (tscm->spec->has_adat)
 30                 pcm_channels += 8;
 31         if (tscm->spec->has_spdif)
 32                 pcm_channels += 2;
 33         runtime->hw.channels_min = runtime->hw.channels_max = pcm_channels;
 34 
 35         hw->rates = SNDRV_PCM_RATE_44100 |
 36                     SNDRV_PCM_RATE_48000 |
 37                     SNDRV_PCM_RATE_88200 |
 38                     SNDRV_PCM_RATE_96000;
 39         snd_pcm_limit_hw_rates(runtime);
 40 
 41         return amdtp_tscm_add_pcm_hw_constraints(stream, runtime);
 42 }
 43 
 44 static int pcm_open(struct snd_pcm_substream *substream)
 45 {
 46         struct snd_tscm *tscm = substream->private_data;
 47         enum snd_tscm_clock clock;
 48         unsigned int rate;
 49         int err;
 50 
 51         err = snd_tscm_stream_lock_try(tscm);
 52         if (err < 0)
 53                 goto end;
 54 
 55         err = pcm_init_hw_params(tscm, substream);
 56         if (err < 0)
 57                 goto err_locked;
 58 
 59         err = snd_tscm_stream_get_clock(tscm, &clock);
 60         if (clock != SND_TSCM_CLOCK_INTERNAL ||
 61             amdtp_stream_pcm_running(&tscm->rx_stream) ||
 62             amdtp_stream_pcm_running(&tscm->tx_stream)) {
 63                 err = snd_tscm_stream_get_rate(tscm, &rate);
 64                 if (err < 0)
 65                         goto err_locked;
 66                 substream->runtime->hw.rate_min = rate;
 67                 substream->runtime->hw.rate_max = rate;
 68         }
 69 
 70         snd_pcm_set_sync(substream);
 71 end:
 72         return err;
 73 err_locked:
 74         snd_tscm_stream_lock_release(tscm);
 75         return err;
 76 }
 77 
 78 static int pcm_close(struct snd_pcm_substream *substream)
 79 {
 80         struct snd_tscm *tscm = substream->private_data;
 81 
 82         snd_tscm_stream_lock_release(tscm);
 83 
 84         return 0;
 85 }
 86 
 87 static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
 88                                  struct snd_pcm_hw_params *hw_params)
 89 {
 90         struct snd_tscm *tscm = substream->private_data;
 91         int err;
 92 
 93         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 94                                                params_buffer_bytes(hw_params));
 95         if (err < 0)
 96                 return err;
 97 
 98         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 99                 mutex_lock(&tscm->mutex);
100                 tscm->substreams_counter++;
101                 mutex_unlock(&tscm->mutex);
102         }
103 
104         return 0;
105 }
106 
107 static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
108                                   struct snd_pcm_hw_params *hw_params)
109 {
110         struct snd_tscm *tscm = substream->private_data;
111         int err;
112 
113         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
114                                                params_buffer_bytes(hw_params));
115         if (err < 0)
116                 return err;
117 
118         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
119                 mutex_lock(&tscm->mutex);
120                 tscm->substreams_counter++;
121                 mutex_unlock(&tscm->mutex);
122         }
123 
124         return 0;
125 }
126 
127 static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
128 {
129         struct snd_tscm *tscm = substream->private_data;
130 
131         mutex_lock(&tscm->mutex);
132 
133         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
134                 tscm->substreams_counter--;
135 
136         snd_tscm_stream_stop_duplex(tscm);
137 
138         mutex_unlock(&tscm->mutex);
139 
140         return snd_pcm_lib_free_vmalloc_buffer(substream);
141 }
142 
143 static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
144 {
145         struct snd_tscm *tscm = substream->private_data;
146 
147         mutex_lock(&tscm->mutex);
148 
149         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
150                 tscm->substreams_counter--;
151 
152         snd_tscm_stream_stop_duplex(tscm);
153 
154         mutex_unlock(&tscm->mutex);
155 
156         return snd_pcm_lib_free_vmalloc_buffer(substream);
157 }
158 
159 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
160 {
161         struct snd_tscm *tscm = substream->private_data;
162         struct snd_pcm_runtime *runtime = substream->runtime;
163         int err;
164 
165         mutex_lock(&tscm->mutex);
166 
167         err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
168         if (err >= 0)
169                 amdtp_stream_pcm_prepare(&tscm->tx_stream);
170 
171         mutex_unlock(&tscm->mutex);
172 
173         return err;
174 }
175 
176 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
177 {
178         struct snd_tscm *tscm = substream->private_data;
179         struct snd_pcm_runtime *runtime = substream->runtime;
180         int err;
181 
182         mutex_lock(&tscm->mutex);
183 
184         err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
185         if (err >= 0)
186                 amdtp_stream_pcm_prepare(&tscm->rx_stream);
187 
188         mutex_unlock(&tscm->mutex);
189 
190         return err;
191 }
192 
193 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
194 {
195         struct snd_tscm *tscm = substream->private_data;
196 
197         switch (cmd) {
198         case SNDRV_PCM_TRIGGER_START:
199                 amdtp_stream_pcm_trigger(&tscm->tx_stream, substream);
200                 break;
201         case SNDRV_PCM_TRIGGER_STOP:
202                 amdtp_stream_pcm_trigger(&tscm->tx_stream, NULL);
203                 break;
204         default:
205                 return -EINVAL;
206         }
207 
208         return 0;
209 }
210 
211 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
212 {
213         struct snd_tscm *tscm = substream->private_data;
214 
215         switch (cmd) {
216         case SNDRV_PCM_TRIGGER_START:
217                 amdtp_stream_pcm_trigger(&tscm->rx_stream, substream);
218                 break;
219         case SNDRV_PCM_TRIGGER_STOP:
220                 amdtp_stream_pcm_trigger(&tscm->rx_stream, NULL);
221                 break;
222         default:
223                 return -EINVAL;
224         }
225 
226         return 0;
227 }
228 
229 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
230 {
231         struct snd_tscm *tscm = sbstrm->private_data;
232 
233         return amdtp_stream_pcm_pointer(&tscm->tx_stream);
234 }
235 
236 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
237 {
238         struct snd_tscm *tscm = sbstrm->private_data;
239 
240         return amdtp_stream_pcm_pointer(&tscm->rx_stream);
241 }
242 
243 static int pcm_capture_ack(struct snd_pcm_substream *substream)
244 {
245         struct snd_tscm *tscm = substream->private_data;
246 
247         return amdtp_stream_pcm_ack(&tscm->tx_stream);
248 }
249 
250 static int pcm_playback_ack(struct snd_pcm_substream *substream)
251 {
252         struct snd_tscm *tscm = substream->private_data;
253 
254         return amdtp_stream_pcm_ack(&tscm->rx_stream);
255 }
256 
257 int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
258 {
259         static const struct snd_pcm_ops capture_ops = {
260                 .open           = pcm_open,
261                 .close          = pcm_close,
262                 .ioctl          = snd_pcm_lib_ioctl,
263                 .hw_params      = pcm_capture_hw_params,
264                 .hw_free        = pcm_capture_hw_free,
265                 .prepare        = pcm_capture_prepare,
266                 .trigger        = pcm_capture_trigger,
267                 .pointer        = pcm_capture_pointer,
268                 .ack            = pcm_capture_ack,
269                 .page           = snd_pcm_lib_get_vmalloc_page,
270         };
271         static const struct snd_pcm_ops playback_ops = {
272                 .open           = pcm_open,
273                 .close          = pcm_close,
274                 .ioctl          = snd_pcm_lib_ioctl,
275                 .hw_params      = pcm_playback_hw_params,
276                 .hw_free        = pcm_playback_hw_free,
277                 .prepare        = pcm_playback_prepare,
278                 .trigger        = pcm_playback_trigger,
279                 .pointer        = pcm_playback_pointer,
280                 .ack            = pcm_playback_ack,
281                 .page           = snd_pcm_lib_get_vmalloc_page,
282                 .mmap           = snd_pcm_lib_mmap_vmalloc,
283         };
284         struct snd_pcm *pcm;
285         int err;
286 
287         err = snd_pcm_new(tscm->card, tscm->card->driver, 0, 1, 1, &pcm);
288         if (err < 0)
289                 return err;
290 
291         pcm->private_data = tscm;
292         snprintf(pcm->name, sizeof(pcm->name),
293                  "%s PCM", tscm->card->shortname);
294         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
295         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
296 
297         return 0;
298 }
299 

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