402 строки
10 KiB
C
402 строки
10 KiB
C
/*
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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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* Licensed under the terms of the GNU General Public License, version 2.
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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 void
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limit_period_and_buffer(struct snd_pcm_hardware *hw)
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{
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hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
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hw->periods_max = UINT_MAX;
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hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */
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/* Just to prevent from allocating much pages. */
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hw->period_bytes_max = hw->period_bytes_min * 2048;
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hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
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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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runtime->hw.info = SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_JOINT_DUPLEX |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID;
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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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limit_period_and_buffer(&runtime->hw);
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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
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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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unsigned int sampling_rate;
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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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goto end;
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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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/*
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* When source of clock is internal or any PCM stream are running,
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* the available sampling rate is limited at current sampling rate.
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*/
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if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
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amdtp_stream_pcm_running(&bebob->tx_stream) ||
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amdtp_stream_pcm_running(&bebob->rx_stream)) {
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err = spec->get(bebob, &sampling_rate);
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if (err < 0) {
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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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}
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snd_pcm_set_sync(substream);
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end:
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return err;
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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
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pcm_capture_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;
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err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
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params_buffer_bytes(hw_params));
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if (err < 0)
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return err;
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if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
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mutex_lock(&bebob->mutex);
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bebob->substreams_counter++;
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mutex_unlock(&bebob->mutex);
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}
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amdtp_am824_set_pcm_format(&bebob->tx_stream, params_format(hw_params));
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return 0;
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}
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static int
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pcm_playback_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;
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err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
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params_buffer_bytes(hw_params));
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if (err < 0)
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return err;
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if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
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mutex_lock(&bebob->mutex);
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bebob->substreams_counter++;
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mutex_unlock(&bebob->mutex);
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}
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amdtp_am824_set_pcm_format(&bebob->rx_stream, params_format(hw_params));
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return 0;
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}
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static int
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pcm_capture_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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if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
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mutex_lock(&bebob->mutex);
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bebob->substreams_counter--;
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mutex_unlock(&bebob->mutex);
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}
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snd_bebob_stream_stop_duplex(bebob);
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return snd_pcm_lib_free_vmalloc_buffer(substream);
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}
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static int
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pcm_playback_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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if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
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mutex_lock(&bebob->mutex);
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bebob->substreams_counter--;
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mutex_unlock(&bebob->mutex);
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}
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snd_bebob_stream_stop_duplex(bebob);
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return snd_pcm_lib_free_vmalloc_buffer(substream);
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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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struct snd_pcm_runtime *runtime = substream->runtime;
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int err;
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err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
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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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struct snd_pcm_runtime *runtime = substream->runtime;
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int err;
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err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
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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
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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_stream_pcm_pointer(&bebob->tx_stream);
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}
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static snd_pcm_uframes_t
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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_stream_pcm_pointer(&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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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pcm_capture_hw_params,
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.hw_free = pcm_capture_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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.page = snd_pcm_lib_get_vmalloc_page,
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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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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pcm_playback_hw_params,
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.hw_free = pcm_playback_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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.page = snd_pcm_lib_get_vmalloc_page,
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.mmap = snd_pcm_lib_mmap_vmalloc,
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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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end:
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return err;
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}
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