371 строка
9.2 KiB
C
371 строка
9.2 KiB
C
/*
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* dice_pcm.c - a part of driver for DICE based devices
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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* Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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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 "dice.h"
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static int limit_channels_and_rates(struct snd_dice *dice,
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struct snd_pcm_runtime *runtime,
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enum amdtp_stream_direction dir,
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unsigned int index, unsigned int size)
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{
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struct snd_pcm_hardware *hw = &runtime->hw;
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struct amdtp_stream *stream;
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unsigned int rate;
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__be32 reg;
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int err;
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/*
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* Retrieve current Multi Bit Linear Audio data channel and limit to
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* it.
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*/
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if (dir == AMDTP_IN_STREAM) {
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stream = &dice->tx_stream[index];
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err = snd_dice_transaction_read_tx(dice,
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size * index + TX_NUMBER_AUDIO,
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®, sizeof(reg));
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} else {
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stream = &dice->rx_stream[index];
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err = snd_dice_transaction_read_rx(dice,
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size * index + RX_NUMBER_AUDIO,
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®, sizeof(reg));
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}
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if (err < 0)
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return err;
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hw->channels_min = hw->channels_max = be32_to_cpu(reg);
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/* Retrieve current sampling transfer frequency and limit to it. */
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err = snd_dice_transaction_get_rate(dice, &rate);
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if (err < 0)
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return err;
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hw->rates = snd_pcm_rate_to_rate_bit(rate);
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snd_pcm_limit_hw_rates(runtime);
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return 0;
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}
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static int init_hw_info(struct snd_dice *dice,
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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 snd_pcm_hardware *hw = &runtime->hw;
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enum amdtp_stream_direction dir;
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struct amdtp_stream *stream;
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__be32 reg[2];
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unsigned int count, size;
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int err;
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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hw->formats = AM824_IN_PCM_FORMAT_BITS;
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dir = AMDTP_IN_STREAM;
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stream = &dice->tx_stream[substream->pcm->device];
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err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
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sizeof(reg));
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} else {
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hw->formats = AM824_OUT_PCM_FORMAT_BITS;
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dir = AMDTP_OUT_STREAM;
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stream = &dice->rx_stream[substream->pcm->device];
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err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
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sizeof(reg));
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}
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if (err < 0)
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return err;
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count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
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if (substream->pcm->device >= count)
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return -ENXIO;
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size = be32_to_cpu(reg[1]) * 4;
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err = limit_channels_and_rates(dice, substream->runtime, dir,
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substream->pcm->device, size);
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if (err < 0)
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return err;
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return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
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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_dice *dice = substream->private_data;
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int err;
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err = snd_dice_stream_lock_try(dice);
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if (err < 0)
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goto end;
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err = init_hw_info(dice, substream);
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if (err < 0)
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goto err_locked;
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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_dice_stream_lock_release(dice);
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return err;
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}
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static int pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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snd_dice_stream_lock_release(dice);
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return 0;
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}
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static int 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_dice *dice = 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(&dice->mutex);
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dice->substreams_counter++;
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mutex_unlock(&dice->mutex);
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}
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return 0;
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}
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static int 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_dice *dice = 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(&dice->mutex);
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dice->substreams_counter++;
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mutex_unlock(&dice->mutex);
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}
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return 0;
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}
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static int capture_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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mutex_lock(&dice->mutex);
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if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
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dice->substreams_counter--;
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snd_dice_stream_stop_duplex(dice);
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mutex_unlock(&dice->mutex);
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return snd_pcm_lib_free_vmalloc_buffer(substream);
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}
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static int playback_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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mutex_lock(&dice->mutex);
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if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
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dice->substreams_counter--;
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snd_dice_stream_stop_duplex(dice);
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mutex_unlock(&dice->mutex);
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return snd_pcm_lib_free_vmalloc_buffer(substream);
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}
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static int capture_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
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int err;
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mutex_lock(&dice->mutex);
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err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
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mutex_unlock(&dice->mutex);
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if (err >= 0)
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amdtp_stream_pcm_prepare(stream);
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return 0;
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}
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static int playback_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
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int err;
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mutex_lock(&dice->mutex);
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err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
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mutex_unlock(&dice->mutex);
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if (err >= 0)
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amdtp_stream_pcm_prepare(stream);
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return err;
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}
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static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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amdtp_stream_pcm_trigger(stream, substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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amdtp_stream_pcm_trigger(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 playback_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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amdtp_stream_pcm_trigger(stream, substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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amdtp_stream_pcm_trigger(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 capture_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
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return amdtp_stream_pcm_pointer(stream);
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}
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static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
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return amdtp_stream_pcm_pointer(stream);
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}
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static int capture_ack(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
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return amdtp_stream_pcm_ack(stream);
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}
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static int playback_ack(struct snd_pcm_substream *substream)
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{
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struct snd_dice *dice = substream->private_data;
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struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
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return amdtp_stream_pcm_ack(stream);
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}
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int snd_dice_create_pcm(struct snd_dice *dice)
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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 = capture_hw_params,
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.hw_free = capture_hw_free,
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.prepare = capture_prepare,
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.trigger = capture_trigger,
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.pointer = capture_pointer,
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.ack = capture_ack,
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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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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 = playback_hw_params,
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.hw_free = playback_hw_free,
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.prepare = playback_prepare,
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.trigger = playback_trigger,
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.pointer = playback_pointer,
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.ack = playback_ack,
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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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__be32 reg;
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struct snd_pcm *pcm;
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unsigned int i, max_capture, max_playback, capture, playback;
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int err;
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/* Check whether PCM substreams are required. */
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if (dice->force_two_pcms) {
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max_capture = max_playback = 2;
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} else {
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max_capture = max_playback = 0;
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err = snd_dice_transaction_read_tx(dice, TX_NUMBER, ®,
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sizeof(reg));
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if (err < 0)
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return err;
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max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
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err = snd_dice_transaction_read_rx(dice, RX_NUMBER, ®,
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sizeof(reg));
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if (err < 0)
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return err;
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max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
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}
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for (i = 0; i < MAX_STREAMS; i++) {
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capture = playback = 0;
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if (i < max_capture)
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capture = 1;
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if (i < max_playback)
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playback = 1;
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if (capture == 0 && playback == 0)
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break;
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err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
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&pcm);
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if (err < 0)
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return err;
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pcm->private_data = dice;
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strcpy(pcm->name, dice->card->shortname);
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if (capture > 0)
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
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&capture_ops);
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if (playback > 0)
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
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&playback_ops);
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}
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return 0;
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}
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