/* * dice_pcm.c - a part of driver for DICE based devices * * Copyright (c) Clemens Ladisch <clemens@ladisch.de> * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp> * * Licensed under the terms of the GNU General Public License, version 2. */ #include "dice.h" static int dice_rate_constraint(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_pcm_substream *substream = rule->private; struct snd_dice *dice = substream->private_data; const struct snd_interval *c = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); struct snd_interval *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); struct snd_interval rates = { .min = UINT_MAX, .max = 0, .integer = 1 }; unsigned int i, rate, mode, *pcm_channels; if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) pcm_channels = dice->tx_channels; else pcm_channels = dice->rx_channels; for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { rate = snd_dice_rates[i]; if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) continue; if (!snd_interval_test(c, pcm_channels[mode])) continue; rates.min = min(rates.min, rate); rates.max = max(rates.max, rate); } return snd_interval_refine(r, &rates); } static int dice_channels_constraint(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_pcm_substream *substream = rule->private; struct snd_dice *dice = substream->private_data; const struct snd_interval *r = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); struct snd_interval *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); struct snd_interval channels = { .min = UINT_MAX, .max = 0, .integer = 1 }; unsigned int i, rate, mode, *pcm_channels; if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) pcm_channels = dice->tx_channels; else pcm_channels = dice->rx_channels; for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { rate = snd_dice_rates[i]; if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) continue; if (!snd_interval_test(r, rate)) continue; channels.min = min(channels.min, pcm_channels[mode]); channels.max = max(channels.max, pcm_channels[mode]); } return snd_interval_refine(c, &channels); } static void limit_channels_and_rates(struct snd_dice *dice, struct snd_pcm_runtime *runtime, unsigned int *pcm_channels) { struct snd_pcm_hardware *hw = &runtime->hw; unsigned int i, rate, mode; hw->channels_min = UINT_MAX; hw->channels_max = 0; for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { rate = snd_dice_rates[i]; if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) continue; hw->rates |= snd_pcm_rate_to_rate_bit(rate); if (pcm_channels[mode] == 0) continue; hw->channels_min = min(hw->channels_min, pcm_channels[mode]); hw->channels_max = max(hw->channels_max, pcm_channels[mode]); } snd_pcm_limit_hw_rates(runtime); } static void limit_period_and_buffer(struct snd_pcm_hardware *hw) { hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */ hw->periods_max = UINT_MAX; hw->period_bytes_min = 4 * hw->channels_max; /* byte for a frame */ /* Just to prevent from allocating much pages. */ hw->period_bytes_max = hw->period_bytes_min * 2048; hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; } static int init_hw_info(struct snd_dice *dice, struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_hardware *hw = &runtime->hw; struct amdtp_stream *stream; unsigned int *pcm_channels; int err; hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BATCH | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_JOINT_DUPLEX | SNDRV_PCM_INFO_BLOCK_TRANSFER; if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { hw->formats = AMDTP_IN_PCM_FORMAT_BITS; stream = &dice->tx_stream; pcm_channels = dice->tx_channels; } else { hw->formats = AMDTP_OUT_PCM_FORMAT_BITS; stream = &dice->rx_stream; pcm_channels = dice->rx_channels; } limit_channels_and_rates(dice, runtime, pcm_channels); limit_period_and_buffer(hw); err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, dice_rate_constraint, substream, SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (err < 0) goto end; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, dice_channels_constraint, substream, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) goto end; err = amdtp_stream_add_pcm_hw_constraints(stream, runtime); end: return err; } static int pcm_open(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; unsigned int source, rate; bool internal; int err; err = snd_dice_stream_lock_try(dice); if (err < 0) goto end; err = init_hw_info(dice, substream); if (err < 0) goto err_locked; err = snd_dice_transaction_get_clock_source(dice, &source); if (err < 0) goto err_locked; switch (source) { case CLOCK_SOURCE_AES1: case CLOCK_SOURCE_AES2: case CLOCK_SOURCE_AES3: case CLOCK_SOURCE_AES4: case CLOCK_SOURCE_AES_ANY: case CLOCK_SOURCE_ADAT: case CLOCK_SOURCE_TDIF: case CLOCK_SOURCE_WC: internal = false; break; default: internal = true; break; } /* * When source of clock is not internal or any PCM streams are running, * available sampling rate is limited at current sampling rate. */ if (!internal || amdtp_stream_pcm_running(&dice->tx_stream) || amdtp_stream_pcm_running(&dice->rx_stream)) { err = snd_dice_transaction_get_rate(dice, &rate); if (err < 0) goto err_locked; substream->runtime->hw.rate_min = rate; substream->runtime->hw.rate_max = rate; } snd_pcm_set_sync(substream); end: return err; err_locked: snd_dice_stream_lock_release(dice); return err; } static int pcm_close(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; snd_dice_stream_lock_release(dice); return 0; } static int capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct snd_dice *dice = substream->private_data; if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { mutex_lock(&dice->mutex); dice->substreams_counter++; mutex_unlock(&dice->mutex); } amdtp_stream_set_pcm_format(&dice->tx_stream, params_format(hw_params)); return snd_pcm_lib_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params)); } static int playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct snd_dice *dice = substream->private_data; if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { mutex_lock(&dice->mutex); dice->substreams_counter++; mutex_unlock(&dice->mutex); } amdtp_stream_set_pcm_format(&dice->rx_stream, params_format(hw_params)); return snd_pcm_lib_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params)); } static int capture_hw_free(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; mutex_lock(&dice->mutex); if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) dice->substreams_counter--; snd_dice_stream_stop_duplex(dice); mutex_unlock(&dice->mutex); return snd_pcm_lib_free_vmalloc_buffer(substream); } static int playback_hw_free(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; mutex_lock(&dice->mutex); if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) dice->substreams_counter--; snd_dice_stream_stop_duplex(dice); mutex_unlock(&dice->mutex); return snd_pcm_lib_free_vmalloc_buffer(substream); } static int capture_prepare(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; int err; mutex_lock(&dice->mutex); err = snd_dice_stream_start_duplex(dice, substream->runtime->rate); mutex_unlock(&dice->mutex); if (err >= 0) amdtp_stream_pcm_prepare(&dice->tx_stream); return 0; } static int playback_prepare(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; int err; mutex_lock(&dice->mutex); err = snd_dice_stream_start_duplex(dice, substream->runtime->rate); mutex_unlock(&dice->mutex); if (err >= 0) amdtp_stream_pcm_prepare(&dice->rx_stream); return err; } static int capture_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_dice *dice = substream->private_data; switch (cmd) { case SNDRV_PCM_TRIGGER_START: amdtp_stream_pcm_trigger(&dice->tx_stream, substream); break; case SNDRV_PCM_TRIGGER_STOP: amdtp_stream_pcm_trigger(&dice->tx_stream, NULL); break; default: return -EINVAL; } return 0; } static int playback_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_dice *dice = substream->private_data; switch (cmd) { case SNDRV_PCM_TRIGGER_START: amdtp_stream_pcm_trigger(&dice->rx_stream, substream); break; case SNDRV_PCM_TRIGGER_STOP: amdtp_stream_pcm_trigger(&dice->rx_stream, NULL); break; default: return -EINVAL; } return 0; } static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; return amdtp_stream_pcm_pointer(&dice->tx_stream); } static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream) { struct snd_dice *dice = substream->private_data; return amdtp_stream_pcm_pointer(&dice->rx_stream); } int snd_dice_create_pcm(struct snd_dice *dice) { static struct snd_pcm_ops capture_ops = { .open = pcm_open, .close = pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = capture_hw_params, .hw_free = capture_hw_free, .prepare = capture_prepare, .trigger = capture_trigger, .pointer = capture_pointer, .page = snd_pcm_lib_get_vmalloc_page, .mmap = snd_pcm_lib_mmap_vmalloc, }; static struct snd_pcm_ops playback_ops = { .open = pcm_open, .close = pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = playback_hw_params, .hw_free = playback_hw_free, .prepare = playback_prepare, .trigger = playback_trigger, .pointer = playback_pointer, .page = snd_pcm_lib_get_vmalloc_page, .mmap = snd_pcm_lib_mmap_vmalloc, }; struct snd_pcm *pcm; unsigned int i, capture, playback; int err; capture = playback = 0; for (i = 0; i < 3; i++) { if (dice->tx_channels[i] > 0) capture = 1; if (dice->rx_channels[i] > 0) playback = 1; } err = snd_pcm_new(dice->card, "DICE", 0, playback, capture, &pcm); if (err < 0) return err; pcm->private_data = dice; strcpy(pcm->name, dice->card->shortname); if (capture > 0) snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); if (playback > 0) snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); return 0; }