1 // SPDX-License-Identifier: GPL-2.0-only
3 * tascam-pcm.c - a part of driver for TASCAM FireWire series
5 * Copyright (c) 2015 Takashi Sakamoto
10 static int pcm_init_hw_params(struct snd_tscm *tscm,
11 struct snd_pcm_substream *substream)
13 struct snd_pcm_runtime *runtime = substream->runtime;
14 struct snd_pcm_hardware *hw = &runtime->hw;
15 struct amdtp_stream *stream;
16 unsigned int pcm_channels;
18 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
19 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
20 stream = &tscm->tx_stream;
21 pcm_channels = tscm->spec->pcm_capture_analog_channels;
23 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
24 stream = &tscm->rx_stream;
25 pcm_channels = tscm->spec->pcm_playback_analog_channels;
28 if (tscm->spec->has_adat)
30 if (tscm->spec->has_spdif)
32 runtime->hw.channels_min = runtime->hw.channels_max = pcm_channels;
34 hw->rates = SNDRV_PCM_RATE_44100 |
35 SNDRV_PCM_RATE_48000 |
36 SNDRV_PCM_RATE_88200 |
38 snd_pcm_limit_hw_rates(runtime);
40 return amdtp_tscm_add_pcm_hw_constraints(stream, runtime);
43 static int pcm_open(struct snd_pcm_substream *substream)
45 struct snd_tscm *tscm = substream->private_data;
46 struct amdtp_domain *d = &tscm->domain;
47 enum snd_tscm_clock clock;
50 err = snd_tscm_stream_lock_try(tscm);
54 err = pcm_init_hw_params(tscm, substream);
58 err = snd_tscm_stream_get_clock(tscm, &clock);
62 mutex_lock(&tscm->mutex);
64 // When source of clock is not internal or any stream is reserved for
65 // transmission of PCM frames, the available sampling rate is limited
67 if (clock != SND_TSCM_CLOCK_INTERNAL || tscm->substreams_counter > 0) {
68 unsigned int frames_per_period = d->events_per_period;
69 unsigned int frames_per_buffer = d->events_per_buffer;
72 err = snd_tscm_stream_get_rate(tscm, &rate);
74 mutex_unlock(&tscm->mutex);
77 substream->runtime->hw.rate_min = rate;
78 substream->runtime->hw.rate_max = rate;
80 err = snd_pcm_hw_constraint_minmax(substream->runtime,
81 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
82 frames_per_period, frames_per_period);
84 mutex_unlock(&tscm->mutex);
88 err = snd_pcm_hw_constraint_minmax(substream->runtime,
89 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
90 frames_per_buffer, frames_per_buffer);
92 mutex_unlock(&tscm->mutex);
97 mutex_unlock(&tscm->mutex);
99 snd_pcm_set_sync(substream);
103 snd_tscm_stream_lock_release(tscm);
107 static int pcm_close(struct snd_pcm_substream *substream)
109 struct snd_tscm *tscm = substream->private_data;
111 snd_tscm_stream_lock_release(tscm);
116 static int pcm_hw_params(struct snd_pcm_substream *substream,
117 struct snd_pcm_hw_params *hw_params)
119 struct snd_tscm *tscm = substream->private_data;
122 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
123 unsigned int rate = params_rate(hw_params);
124 unsigned int frames_per_period = params_period_size(hw_params);
125 unsigned int frames_per_buffer = params_buffer_size(hw_params);
127 mutex_lock(&tscm->mutex);
128 err = snd_tscm_stream_reserve_duplex(tscm, rate,
129 frames_per_period, frames_per_buffer);
131 ++tscm->substreams_counter;
132 mutex_unlock(&tscm->mutex);
138 static int pcm_hw_free(struct snd_pcm_substream *substream)
140 struct snd_tscm *tscm = substream->private_data;
142 mutex_lock(&tscm->mutex);
144 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
145 --tscm->substreams_counter;
147 snd_tscm_stream_stop_duplex(tscm);
149 mutex_unlock(&tscm->mutex);
154 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
156 struct snd_tscm *tscm = substream->private_data;
157 struct snd_pcm_runtime *runtime = substream->runtime;
160 mutex_lock(&tscm->mutex);
162 err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
164 amdtp_stream_pcm_prepare(&tscm->tx_stream);
166 mutex_unlock(&tscm->mutex);
171 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
173 struct snd_tscm *tscm = substream->private_data;
174 struct snd_pcm_runtime *runtime = substream->runtime;
177 mutex_lock(&tscm->mutex);
179 err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
181 amdtp_stream_pcm_prepare(&tscm->rx_stream);
183 mutex_unlock(&tscm->mutex);
188 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
190 struct snd_tscm *tscm = substream->private_data;
193 case SNDRV_PCM_TRIGGER_START:
194 amdtp_stream_pcm_trigger(&tscm->tx_stream, substream);
196 case SNDRV_PCM_TRIGGER_STOP:
197 amdtp_stream_pcm_trigger(&tscm->tx_stream, NULL);
206 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
208 struct snd_tscm *tscm = substream->private_data;
211 case SNDRV_PCM_TRIGGER_START:
212 amdtp_stream_pcm_trigger(&tscm->rx_stream, substream);
214 case SNDRV_PCM_TRIGGER_STOP:
215 amdtp_stream_pcm_trigger(&tscm->rx_stream, NULL);
224 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
226 struct snd_tscm *tscm = sbstrm->private_data;
228 return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->tx_stream);
231 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
233 struct snd_tscm *tscm = sbstrm->private_data;
235 return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->rx_stream);
238 static int pcm_capture_ack(struct snd_pcm_substream *substream)
240 struct snd_tscm *tscm = substream->private_data;
242 return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->tx_stream);
245 static int pcm_playback_ack(struct snd_pcm_substream *substream)
247 struct snd_tscm *tscm = substream->private_data;
249 return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->rx_stream);
252 int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
254 static const struct snd_pcm_ops capture_ops = {
257 .hw_params = pcm_hw_params,
258 .hw_free = pcm_hw_free,
259 .prepare = pcm_capture_prepare,
260 .trigger = pcm_capture_trigger,
261 .pointer = pcm_capture_pointer,
262 .ack = pcm_capture_ack,
264 static const struct snd_pcm_ops playback_ops = {
267 .hw_params = pcm_hw_params,
268 .hw_free = pcm_hw_free,
269 .prepare = pcm_playback_prepare,
270 .trigger = pcm_playback_trigger,
271 .pointer = pcm_playback_pointer,
272 .ack = pcm_playback_ack,
277 err = snd_pcm_new(tscm->card, tscm->card->driver, 0, 1, 1, &pcm);
281 pcm->private_data = tscm;
282 snprintf(pcm->name, sizeof(pcm->name),
283 "%s PCM", tscm->card->shortname);
284 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
285 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
286 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);