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377 lines
9.3 KiB
377 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* bebob_pcm.c - a part of driver for BeBoB based devices |
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* |
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* Copyright (c) 2013-2014 Takashi Sakamoto |
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*/ |
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#include "./bebob.h" |
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static int |
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hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
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{ |
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struct snd_bebob_stream_formation *formations = rule->private; |
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struct snd_interval *r = |
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hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); |
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const struct snd_interval *c = |
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hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
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struct snd_interval t = { |
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.min = UINT_MAX, .max = 0, .integer = 1 |
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}; |
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unsigned int i; |
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for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { |
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/* entry is invalid */ |
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if (formations[i].pcm == 0) |
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continue; |
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if (!snd_interval_test(c, formations[i].pcm)) |
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continue; |
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t.min = min(t.min, snd_bebob_rate_table[i]); |
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t.max = max(t.max, snd_bebob_rate_table[i]); |
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} |
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return snd_interval_refine(r, &t); |
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} |
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static int |
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hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
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{ |
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struct snd_bebob_stream_formation *formations = rule->private; |
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struct snd_interval *c = |
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hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
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const struct snd_interval *r = |
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hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); |
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struct snd_interval t = { |
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.min = UINT_MAX, .max = 0, .integer = 1 |
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}; |
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unsigned int i; |
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for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { |
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/* entry is invalid */ |
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if (formations[i].pcm == 0) |
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continue; |
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if (!snd_interval_test(r, snd_bebob_rate_table[i])) |
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continue; |
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t.min = min(t.min, formations[i].pcm); |
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t.max = max(t.max, formations[i].pcm); |
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} |
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return snd_interval_refine(c, &t); |
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} |
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static void |
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limit_channels_and_rates(struct snd_pcm_hardware *hw, |
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struct snd_bebob_stream_formation *formations) |
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{ |
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unsigned int i; |
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hw->channels_min = UINT_MAX; |
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hw->channels_max = 0; |
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hw->rate_min = UINT_MAX; |
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hw->rate_max = 0; |
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hw->rates = 0; |
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for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { |
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/* entry has no PCM channels */ |
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if (formations[i].pcm == 0) |
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continue; |
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hw->channels_min = min(hw->channels_min, formations[i].pcm); |
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hw->channels_max = max(hw->channels_max, formations[i].pcm); |
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hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]); |
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hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]); |
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hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]); |
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} |
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} |
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static int |
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pcm_init_hw_params(struct snd_bebob *bebob, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct amdtp_stream *s; |
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struct snd_bebob_stream_formation *formations; |
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int err; |
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { |
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runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS; |
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s = &bebob->tx_stream; |
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formations = bebob->tx_stream_formations; |
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} else { |
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runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS; |
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s = &bebob->rx_stream; |
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formations = bebob->rx_stream_formations; |
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} |
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limit_channels_and_rates(&runtime->hw, formations); |
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err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, |
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hw_rule_channels, formations, |
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SNDRV_PCM_HW_PARAM_RATE, -1); |
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if (err < 0) |
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goto end; |
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err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, |
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hw_rule_rate, formations, |
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SNDRV_PCM_HW_PARAM_CHANNELS, -1); |
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if (err < 0) |
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goto end; |
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err = amdtp_am824_add_pcm_hw_constraints(s, runtime); |
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end: |
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return err; |
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} |
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static int pcm_open(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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const struct snd_bebob_rate_spec *spec = bebob->spec->rate; |
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struct amdtp_domain *d = &bebob->domain; |
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enum snd_bebob_clock_type src; |
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int err; |
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err = snd_bebob_stream_lock_try(bebob); |
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if (err < 0) |
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return err; |
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err = pcm_init_hw_params(bebob, substream); |
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if (err < 0) |
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goto err_locked; |
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err = snd_bebob_stream_get_clock_src(bebob, &src); |
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if (err < 0) |
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goto err_locked; |
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mutex_lock(&bebob->mutex); |
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// When source of clock is not internal or any stream is reserved for |
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// transmission of PCM frames, the available sampling rate is limited |
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// at current one. |
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if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL || |
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(bebob->substreams_counter > 0 && d->events_per_period > 0)) { |
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unsigned int frames_per_period = d->events_per_period; |
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unsigned int frames_per_buffer = d->events_per_buffer; |
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unsigned int sampling_rate; |
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err = spec->get(bebob, &sampling_rate); |
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if (err < 0) { |
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mutex_unlock(&bebob->mutex); |
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dev_err(&bebob->unit->device, |
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"fail to get sampling rate: %d\n", err); |
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goto err_locked; |
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} |
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substream->runtime->hw.rate_min = sampling_rate; |
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substream->runtime->hw.rate_max = sampling_rate; |
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if (frames_per_period > 0) { |
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err = snd_pcm_hw_constraint_minmax(substream->runtime, |
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SNDRV_PCM_HW_PARAM_PERIOD_SIZE, |
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frames_per_period, frames_per_period); |
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if (err < 0) { |
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mutex_unlock(&bebob->mutex); |
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goto err_locked; |
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} |
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err = snd_pcm_hw_constraint_minmax(substream->runtime, |
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SNDRV_PCM_HW_PARAM_BUFFER_SIZE, |
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frames_per_buffer, frames_per_buffer); |
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if (err < 0) { |
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mutex_unlock(&bebob->mutex); |
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goto err_locked; |
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} |
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} |
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} |
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mutex_unlock(&bebob->mutex); |
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snd_pcm_set_sync(substream); |
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return 0; |
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err_locked: |
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snd_bebob_stream_lock_release(bebob); |
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return err; |
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} |
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static int |
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pcm_close(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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snd_bebob_stream_lock_release(bebob); |
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return 0; |
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} |
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static int pcm_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *hw_params) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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int err = 0; |
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if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
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unsigned int rate = params_rate(hw_params); |
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unsigned int frames_per_period = params_period_size(hw_params); |
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unsigned int frames_per_buffer = params_buffer_size(hw_params); |
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mutex_lock(&bebob->mutex); |
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err = snd_bebob_stream_reserve_duplex(bebob, rate, |
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frames_per_period, frames_per_buffer); |
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if (err >= 0) |
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++bebob->substreams_counter; |
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mutex_unlock(&bebob->mutex); |
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} |
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return err; |
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} |
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static int pcm_hw_free(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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mutex_lock(&bebob->mutex); |
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if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) |
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bebob->substreams_counter--; |
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snd_bebob_stream_stop_duplex(bebob); |
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mutex_unlock(&bebob->mutex); |
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return 0; |
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} |
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static int |
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pcm_capture_prepare(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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int err; |
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err = snd_bebob_stream_start_duplex(bebob); |
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if (err >= 0) |
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amdtp_stream_pcm_prepare(&bebob->tx_stream); |
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return err; |
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} |
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static int |
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pcm_playback_prepare(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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int err; |
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err = snd_bebob_stream_start_duplex(bebob); |
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if (err >= 0) |
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amdtp_stream_pcm_prepare(&bebob->rx_stream); |
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return err; |
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} |
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static int |
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pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int |
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pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm) |
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{ |
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struct snd_bebob *bebob = sbstrm->private_data; |
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return amdtp_domain_stream_pcm_pointer(&bebob->domain, |
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&bebob->tx_stream); |
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} |
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static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm) |
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{ |
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struct snd_bebob *bebob = sbstrm->private_data; |
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return amdtp_domain_stream_pcm_pointer(&bebob->domain, |
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&bebob->rx_stream); |
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} |
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static int pcm_capture_ack(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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return amdtp_domain_stream_pcm_ack(&bebob->domain, &bebob->tx_stream); |
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} |
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static int pcm_playback_ack(struct snd_pcm_substream *substream) |
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{ |
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struct snd_bebob *bebob = substream->private_data; |
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return amdtp_domain_stream_pcm_ack(&bebob->domain, &bebob->rx_stream); |
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} |
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int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) |
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{ |
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static const struct snd_pcm_ops capture_ops = { |
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.open = pcm_open, |
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.close = pcm_close, |
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.hw_params = pcm_hw_params, |
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.hw_free = pcm_hw_free, |
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.prepare = pcm_capture_prepare, |
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.trigger = pcm_capture_trigger, |
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.pointer = pcm_capture_pointer, |
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.ack = pcm_capture_ack, |
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}; |
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static const struct snd_pcm_ops playback_ops = { |
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.open = pcm_open, |
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.close = pcm_close, |
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.hw_params = pcm_hw_params, |
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.hw_free = pcm_hw_free, |
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.prepare = pcm_playback_prepare, |
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.trigger = pcm_playback_trigger, |
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.pointer = pcm_playback_pointer, |
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.ack = pcm_playback_ack, |
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}; |
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struct snd_pcm *pcm; |
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int err; |
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err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); |
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if (err < 0) |
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goto end; |
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pcm->private_data = bebob; |
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snprintf(pcm->name, sizeof(pcm->name), |
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"%s PCM", bebob->card->shortname); |
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); |
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); |
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snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0); |
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end: |
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return err; |
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}
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