1 // SPDX-License-Identifier: GPL-2.0-only
3 * motu-pcm.c - a part of driver for MOTU FireWire series
5 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
8 #include <sound/pcm_params.h>
11 static int motu_rate_constraint(struct snd_pcm_hw_params *params,
12 struct snd_pcm_hw_rule *rule)
14 struct snd_motu_packet_format *formats = rule->private;
16 const struct snd_interval *c =
17 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
18 struct snd_interval *r =
19 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
20 struct snd_interval rates = {
21 .min = UINT_MAX, .max = 0, .integer = 1
23 unsigned int i, pcm_channels, rate, mode;
25 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
26 rate = snd_motu_clock_rates[i];
29 pcm_channels = formats->fixed_part_pcm_chunks[mode] +
30 formats->differed_part_pcm_chunks[mode];
31 if (!snd_interval_test(c, pcm_channels))
34 rates.min = min(rates.min, rate);
35 rates.max = max(rates.max, rate);
38 return snd_interval_refine(r, &rates);
41 static int motu_channels_constraint(struct snd_pcm_hw_params *params,
42 struct snd_pcm_hw_rule *rule)
44 struct snd_motu_packet_format *formats = rule->private;
46 const struct snd_interval *r =
47 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
48 struct snd_interval *c =
49 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
50 struct snd_interval channels = {
51 .min = UINT_MAX, .max = 0, .integer = 1
53 unsigned int i, pcm_channels, rate, mode;
55 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
56 rate = snd_motu_clock_rates[i];
59 if (!snd_interval_test(r, rate))
62 pcm_channels = formats->fixed_part_pcm_chunks[mode] +
63 formats->differed_part_pcm_chunks[mode];
64 channels.min = min(channels.min, pcm_channels);
65 channels.max = max(channels.max, pcm_channels);
68 return snd_interval_refine(c, &channels);
71 static void limit_channels_and_rates(struct snd_motu *motu,
72 struct snd_pcm_runtime *runtime,
73 struct snd_motu_packet_format *formats)
75 struct snd_pcm_hardware *hw = &runtime->hw;
76 unsigned int i, pcm_channels, rate, mode;
78 hw->channels_min = UINT_MAX;
81 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
82 rate = snd_motu_clock_rates[i];
85 pcm_channels = formats->fixed_part_pcm_chunks[mode] +
86 formats->differed_part_pcm_chunks[mode];
87 if (pcm_channels == 0)
90 hw->rates |= snd_pcm_rate_to_rate_bit(rate);
91 hw->channels_min = min(hw->channels_min, pcm_channels);
92 hw->channels_max = max(hw->channels_max, pcm_channels);
95 snd_pcm_limit_hw_rates(runtime);
98 static int init_hw_info(struct snd_motu *motu,
99 struct snd_pcm_substream *substream)
101 struct snd_pcm_runtime *runtime = substream->runtime;
102 struct snd_pcm_hardware *hw = &runtime->hw;
103 struct amdtp_stream *stream;
104 struct snd_motu_packet_format *formats;
107 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
108 hw->formats = SNDRV_PCM_FMTBIT_S32;
109 stream = &motu->tx_stream;
110 formats = &motu->tx_packet_formats;
112 hw->formats = SNDRV_PCM_FMTBIT_S32;
113 stream = &motu->rx_stream;
114 formats = &motu->rx_packet_formats;
117 limit_channels_and_rates(motu, runtime, formats);
119 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
120 motu_rate_constraint, formats,
121 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
125 motu_channels_constraint, formats,
126 SNDRV_PCM_HW_PARAM_RATE, -1);
130 return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
133 static int pcm_open(struct snd_pcm_substream *substream)
135 struct snd_motu *motu = substream->private_data;
136 const struct snd_motu_protocol *const protocol = motu->spec->protocol;
137 struct amdtp_domain *d = &motu->domain;
138 enum snd_motu_clock_source src;
141 err = snd_motu_stream_lock_try(motu);
145 mutex_lock(&motu->mutex);
147 err = snd_motu_stream_cache_packet_formats(motu);
151 err = init_hw_info(motu, substream);
155 err = protocol->get_clock_source(motu, &src);
159 // When source of clock is not internal or any stream is reserved for
160 // transmission of PCM frames, the available sampling rate is limited
162 if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
163 (motu->substreams_counter > 0 && d->events_per_period > 0)) {
164 unsigned int frames_per_period = d->events_per_period;
165 unsigned int frames_per_buffer = d->events_per_buffer;
168 err = protocol->get_clock_rate(motu, &rate);
172 substream->runtime->hw.rate_min = rate;
173 substream->runtime->hw.rate_max = rate;
175 if (frames_per_period > 0) {
176 err = snd_pcm_hw_constraint_minmax(substream->runtime,
177 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
178 frames_per_period, frames_per_period);
180 mutex_unlock(&motu->mutex);
184 err = snd_pcm_hw_constraint_minmax(substream->runtime,
185 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
186 frames_per_buffer, frames_per_buffer);
188 mutex_unlock(&motu->mutex);
194 snd_pcm_set_sync(substream);
196 mutex_unlock(&motu->mutex);
200 mutex_unlock(&motu->mutex);
201 snd_motu_stream_lock_release(motu);
205 static int pcm_close(struct snd_pcm_substream *substream)
207 struct snd_motu *motu = substream->private_data;
209 snd_motu_stream_lock_release(motu);
214 static int pcm_hw_params(struct snd_pcm_substream *substream,
215 struct snd_pcm_hw_params *hw_params)
217 struct snd_motu *motu = substream->private_data;
220 err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
221 params_buffer_bytes(hw_params));
225 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
226 unsigned int rate = params_rate(hw_params);
227 unsigned int frames_per_period = params_period_size(hw_params);
228 unsigned int frames_per_buffer = params_buffer_size(hw_params);
230 mutex_lock(&motu->mutex);
231 err = snd_motu_stream_reserve_duplex(motu, rate,
232 frames_per_period, frames_per_buffer);
234 ++motu->substreams_counter;
235 mutex_unlock(&motu->mutex);
241 static int pcm_hw_free(struct snd_pcm_substream *substream)
243 struct snd_motu *motu = substream->private_data;
245 mutex_lock(&motu->mutex);
247 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
248 --motu->substreams_counter;
250 snd_motu_stream_stop_duplex(motu);
252 mutex_unlock(&motu->mutex);
254 return snd_pcm_lib_free_vmalloc_buffer(substream);
257 static int capture_prepare(struct snd_pcm_substream *substream)
259 struct snd_motu *motu = substream->private_data;
262 mutex_lock(&motu->mutex);
263 err = snd_motu_stream_start_duplex(motu);
264 mutex_unlock(&motu->mutex);
266 amdtp_stream_pcm_prepare(&motu->tx_stream);
270 static int playback_prepare(struct snd_pcm_substream *substream)
272 struct snd_motu *motu = substream->private_data;
275 mutex_lock(&motu->mutex);
276 err = snd_motu_stream_start_duplex(motu);
277 mutex_unlock(&motu->mutex);
279 amdtp_stream_pcm_prepare(&motu->rx_stream);
284 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
286 struct snd_motu *motu = substream->private_data;
289 case SNDRV_PCM_TRIGGER_START:
290 amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
292 case SNDRV_PCM_TRIGGER_STOP:
293 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
301 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
303 struct snd_motu *motu = substream->private_data;
306 case SNDRV_PCM_TRIGGER_START:
307 amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
309 case SNDRV_PCM_TRIGGER_STOP:
310 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
319 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
321 struct snd_motu *motu = substream->private_data;
323 return amdtp_stream_pcm_pointer(&motu->tx_stream);
325 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
327 struct snd_motu *motu = substream->private_data;
329 return amdtp_stream_pcm_pointer(&motu->rx_stream);
332 static int capture_ack(struct snd_pcm_substream *substream)
334 struct snd_motu *motu = substream->private_data;
336 return amdtp_stream_pcm_ack(&motu->tx_stream);
339 static int playback_ack(struct snd_pcm_substream *substream)
341 struct snd_motu *motu = substream->private_data;
343 return amdtp_stream_pcm_ack(&motu->rx_stream);
346 int snd_motu_create_pcm_devices(struct snd_motu *motu)
348 static const struct snd_pcm_ops capture_ops = {
351 .ioctl = snd_pcm_lib_ioctl,
352 .hw_params = pcm_hw_params,
353 .hw_free = pcm_hw_free,
354 .prepare = capture_prepare,
355 .trigger = capture_trigger,
356 .pointer = capture_pointer,
358 .page = snd_pcm_lib_get_vmalloc_page,
360 static const struct snd_pcm_ops playback_ops = {
363 .ioctl = snd_pcm_lib_ioctl,
364 .hw_params = pcm_hw_params,
365 .hw_free = pcm_hw_free,
366 .prepare = playback_prepare,
367 .trigger = playback_trigger,
368 .pointer = playback_pointer,
370 .page = snd_pcm_lib_get_vmalloc_page,
375 err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
378 pcm->private_data = motu;
379 strcpy(pcm->name, motu->card->shortname);
381 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
382 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);