1 // SPDX-License-Identifier: GPL-2.0-only
3 * bebob_pcm.c - a part of driver for BeBoB based devices
5 * Copyright (c) 2013-2014 Takashi Sakamoto
11 hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
13 struct snd_bebob_stream_formation *formations = rule->private;
14 struct snd_interval *r =
15 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
16 const struct snd_interval *c =
17 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
18 struct snd_interval t = {
19 .min = UINT_MAX, .max = 0, .integer = 1
23 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
24 /* entry is invalid */
25 if (formations[i].pcm == 0)
28 if (!snd_interval_test(c, formations[i].pcm))
31 t.min = min(t.min, snd_bebob_rate_table[i]);
32 t.max = max(t.max, snd_bebob_rate_table[i]);
35 return snd_interval_refine(r, &t);
39 hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
41 struct snd_bebob_stream_formation *formations = rule->private;
42 struct snd_interval *c =
43 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
44 const struct snd_interval *r =
45 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
46 struct snd_interval t = {
47 .min = UINT_MAX, .max = 0, .integer = 1
52 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
53 /* entry is invalid */
54 if (formations[i].pcm == 0)
57 if (!snd_interval_test(r, snd_bebob_rate_table[i]))
60 t.min = min(t.min, formations[i].pcm);
61 t.max = max(t.max, formations[i].pcm);
64 return snd_interval_refine(c, &t);
68 limit_channels_and_rates(struct snd_pcm_hardware *hw,
69 struct snd_bebob_stream_formation *formations)
73 hw->channels_min = UINT_MAX;
76 hw->rate_min = UINT_MAX;
80 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
81 /* entry has no PCM channels */
82 if (formations[i].pcm == 0)
85 hw->channels_min = min(hw->channels_min, formations[i].pcm);
86 hw->channels_max = max(hw->channels_max, formations[i].pcm);
88 hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
89 hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
90 hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
95 pcm_init_hw_params(struct snd_bebob *bebob,
96 struct snd_pcm_substream *substream)
98 struct snd_pcm_runtime *runtime = substream->runtime;
99 struct amdtp_stream *s;
100 struct snd_bebob_stream_formation *formations;
103 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
104 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
105 s = &bebob->tx_stream;
106 formations = bebob->tx_stream_formations;
108 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
109 s = &bebob->rx_stream;
110 formations = bebob->rx_stream_formations;
113 limit_channels_and_rates(&runtime->hw, formations);
115 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
116 hw_rule_channels, formations,
117 SNDRV_PCM_HW_PARAM_RATE, -1);
121 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
122 hw_rule_rate, formations,
123 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
127 err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
132 static int pcm_open(struct snd_pcm_substream *substream)
134 struct snd_bebob *bebob = substream->private_data;
135 const struct snd_bebob_rate_spec *spec = bebob->spec->rate;
136 struct amdtp_domain *d = &bebob->domain;
137 enum snd_bebob_clock_type src;
140 err = snd_bebob_stream_lock_try(bebob);
144 err = pcm_init_hw_params(bebob, substream);
148 err = snd_bebob_stream_get_clock_src(bebob, &src);
152 mutex_lock(&bebob->mutex);
154 // When source of clock is not internal or any stream is reserved for
155 // transmission of PCM frames, the available sampling rate is limited
157 if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
158 (bebob->substreams_counter > 0 && d->events_per_period > 0)) {
159 unsigned int frames_per_period = d->events_per_period;
160 unsigned int frames_per_buffer = d->events_per_buffer;
161 unsigned int sampling_rate;
163 err = spec->get(bebob, &sampling_rate);
165 mutex_unlock(&bebob->mutex);
166 dev_err(&bebob->unit->device,
167 "fail to get sampling rate: %d\n", err);
171 substream->runtime->hw.rate_min = sampling_rate;
172 substream->runtime->hw.rate_max = sampling_rate;
174 if (frames_per_period > 0) {
175 err = snd_pcm_hw_constraint_minmax(substream->runtime,
176 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
177 frames_per_period, frames_per_period);
179 mutex_unlock(&bebob->mutex);
183 err = snd_pcm_hw_constraint_minmax(substream->runtime,
184 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
185 frames_per_buffer, frames_per_buffer);
187 mutex_unlock(&bebob->mutex);
193 mutex_unlock(&bebob->mutex);
195 snd_pcm_set_sync(substream);
199 snd_bebob_stream_lock_release(bebob);
204 pcm_close(struct snd_pcm_substream *substream)
206 struct snd_bebob *bebob = substream->private_data;
207 snd_bebob_stream_lock_release(bebob);
211 static int pcm_hw_params(struct snd_pcm_substream *substream,
212 struct snd_pcm_hw_params *hw_params)
214 struct snd_bebob *bebob = substream->private_data;
217 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
218 unsigned int rate = params_rate(hw_params);
219 unsigned int frames_per_period = params_period_size(hw_params);
220 unsigned int frames_per_buffer = params_buffer_size(hw_params);
222 mutex_lock(&bebob->mutex);
223 err = snd_bebob_stream_reserve_duplex(bebob, rate,
224 frames_per_period, frames_per_buffer);
226 ++bebob->substreams_counter;
227 mutex_unlock(&bebob->mutex);
233 static int pcm_hw_free(struct snd_pcm_substream *substream)
235 struct snd_bebob *bebob = substream->private_data;
237 mutex_lock(&bebob->mutex);
239 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
240 bebob->substreams_counter--;
242 snd_bebob_stream_stop_duplex(bebob);
244 mutex_unlock(&bebob->mutex);
250 pcm_capture_prepare(struct snd_pcm_substream *substream)
252 struct snd_bebob *bebob = substream->private_data;
255 err = snd_bebob_stream_start_duplex(bebob);
257 amdtp_stream_pcm_prepare(&bebob->tx_stream);
262 pcm_playback_prepare(struct snd_pcm_substream *substream)
264 struct snd_bebob *bebob = substream->private_data;
267 err = snd_bebob_stream_start_duplex(bebob);
269 amdtp_stream_pcm_prepare(&bebob->rx_stream);
275 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
277 struct snd_bebob *bebob = substream->private_data;
280 case SNDRV_PCM_TRIGGER_START:
281 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
283 case SNDRV_PCM_TRIGGER_STOP:
284 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
293 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
295 struct snd_bebob *bebob = substream->private_data;
298 case SNDRV_PCM_TRIGGER_START:
299 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
301 case SNDRV_PCM_TRIGGER_STOP:
302 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
311 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
313 struct snd_bebob *bebob = sbstrm->private_data;
315 return amdtp_domain_stream_pcm_pointer(&bebob->domain,
318 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
320 struct snd_bebob *bebob = sbstrm->private_data;
322 return amdtp_domain_stream_pcm_pointer(&bebob->domain,
326 static int pcm_capture_ack(struct snd_pcm_substream *substream)
328 struct snd_bebob *bebob = substream->private_data;
330 return amdtp_domain_stream_pcm_ack(&bebob->domain, &bebob->tx_stream);
333 static int pcm_playback_ack(struct snd_pcm_substream *substream)
335 struct snd_bebob *bebob = substream->private_data;
337 return amdtp_domain_stream_pcm_ack(&bebob->domain, &bebob->rx_stream);
340 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
342 static const struct snd_pcm_ops capture_ops = {
345 .hw_params = pcm_hw_params,
346 .hw_free = pcm_hw_free,
347 .prepare = pcm_capture_prepare,
348 .trigger = pcm_capture_trigger,
349 .pointer = pcm_capture_pointer,
350 .ack = pcm_capture_ack,
352 static const struct snd_pcm_ops playback_ops = {
355 .hw_params = pcm_hw_params,
356 .hw_free = pcm_hw_free,
357 .prepare = pcm_playback_prepare,
358 .trigger = pcm_playback_trigger,
359 .pointer = pcm_playback_pointer,
360 .ack = pcm_playback_ack,
365 err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
369 pcm->private_data = bebob;
370 snprintf(pcm->name, sizeof(pcm->name),
371 "%s PCM", bebob->card->shortname);
372 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
373 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
374 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);