| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * bebob_pcm.c - a part of driver for BeBoB based devices |
| * |
| * Copyright (c) 2013-2014 Takashi Sakamoto |
| */ |
| |
| #include "./bebob.h" |
| |
| static int |
| hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
| { |
| struct snd_bebob_stream_formation *formations = rule->private; |
| struct snd_interval *r = |
| hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); |
| const struct snd_interval *c = |
| hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
| struct snd_interval t = { |
| .min = UINT_MAX, .max = 0, .integer = 1 |
| }; |
| unsigned int i; |
| |
| for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { |
| /* entry is invalid */ |
| if (formations[i].pcm == 0) |
| continue; |
| |
| if (!snd_interval_test(c, formations[i].pcm)) |
| continue; |
| |
| t.min = min(t.min, snd_bebob_rate_table[i]); |
| t.max = max(t.max, snd_bebob_rate_table[i]); |
| |
| } |
| return snd_interval_refine(r, &t); |
| } |
| |
| static int |
| hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
| { |
| struct snd_bebob_stream_formation *formations = rule->private; |
| struct snd_interval *c = |
| hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
| const struct snd_interval *r = |
| hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); |
| struct snd_interval t = { |
| .min = UINT_MAX, .max = 0, .integer = 1 |
| }; |
| |
| unsigned int i; |
| |
| for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { |
| /* entry is invalid */ |
| if (formations[i].pcm == 0) |
| continue; |
| |
| if (!snd_interval_test(r, snd_bebob_rate_table[i])) |
| continue; |
| |
| t.min = min(t.min, formations[i].pcm); |
| t.max = max(t.max, formations[i].pcm); |
| } |
| |
| return snd_interval_refine(c, &t); |
| } |
| |
| static void |
| limit_channels_and_rates(struct snd_pcm_hardware *hw, |
| struct snd_bebob_stream_formation *formations) |
| { |
| unsigned int i; |
| |
| hw->channels_min = UINT_MAX; |
| hw->channels_max = 0; |
| |
| hw->rate_min = UINT_MAX; |
| hw->rate_max = 0; |
| hw->rates = 0; |
| |
| for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { |
| /* entry has no PCM channels */ |
| if (formations[i].pcm == 0) |
| continue; |
| |
| hw->channels_min = min(hw->channels_min, formations[i].pcm); |
| hw->channels_max = max(hw->channels_max, formations[i].pcm); |
| |
| hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]); |
| hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]); |
| hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]); |
| } |
| } |
| |
| static int |
| pcm_init_hw_params(struct snd_bebob *bebob, |
| struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct amdtp_stream *s; |
| struct snd_bebob_stream_formation *formations; |
| int err; |
| |
| if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { |
| runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS; |
| s = &bebob->tx_stream; |
| formations = bebob->tx_stream_formations; |
| } else { |
| runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS; |
| s = &bebob->rx_stream; |
| formations = bebob->rx_stream_formations; |
| } |
| |
| limit_channels_and_rates(&runtime->hw, formations); |
| |
| err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, |
| hw_rule_channels, formations, |
| SNDRV_PCM_HW_PARAM_RATE, -1); |
| if (err < 0) |
| goto end; |
| |
| err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, |
| hw_rule_rate, formations, |
| SNDRV_PCM_HW_PARAM_CHANNELS, -1); |
| if (err < 0) |
| goto end; |
| |
| err = amdtp_am824_add_pcm_hw_constraints(s, runtime); |
| end: |
| return err; |
| } |
| |
| static int |
| pcm_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| const struct snd_bebob_rate_spec *spec = bebob->spec->rate; |
| unsigned int sampling_rate; |
| enum snd_bebob_clock_type src; |
| int err; |
| |
| err = snd_bebob_stream_lock_try(bebob); |
| if (err < 0) |
| goto end; |
| |
| err = pcm_init_hw_params(bebob, substream); |
| if (err < 0) |
| goto err_locked; |
| |
| err = snd_bebob_stream_get_clock_src(bebob, &src); |
| if (err < 0) |
| goto err_locked; |
| |
| /* |
| * When source of clock is internal or any PCM stream are running, |
| * the available sampling rate is limited at current sampling rate. |
| */ |
| if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL || |
| amdtp_stream_pcm_running(&bebob->tx_stream) || |
| amdtp_stream_pcm_running(&bebob->rx_stream)) { |
| err = spec->get(bebob, &sampling_rate); |
| if (err < 0) { |
| dev_err(&bebob->unit->device, |
| "fail to get sampling rate: %d\n", err); |
| goto err_locked; |
| } |
| |
| substream->runtime->hw.rate_min = sampling_rate; |
| substream->runtime->hw.rate_max = sampling_rate; |
| } |
| |
| snd_pcm_set_sync(substream); |
| end: |
| return err; |
| err_locked: |
| snd_bebob_stream_lock_release(bebob); |
| return err; |
| } |
| |
| static int |
| pcm_close(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| snd_bebob_stream_lock_release(bebob); |
| return 0; |
| } |
| |
| static int pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *hw_params) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| int err; |
| |
| err = snd_pcm_lib_alloc_vmalloc_buffer(substream, |
| params_buffer_bytes(hw_params)); |
| if (err < 0) |
| return err; |
| |
| if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
| unsigned int rate = params_rate(hw_params); |
| unsigned int frames_per_period = params_period_size(hw_params); |
| |
| mutex_lock(&bebob->mutex); |
| err = snd_bebob_stream_reserve_duplex(bebob, rate, |
| frames_per_period); |
| if (err >= 0) |
| ++bebob->substreams_counter; |
| mutex_unlock(&bebob->mutex); |
| } |
| |
| return err; |
| } |
| |
| static int pcm_hw_free(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| |
| mutex_lock(&bebob->mutex); |
| |
| if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) |
| bebob->substreams_counter--; |
| |
| snd_bebob_stream_stop_duplex(bebob); |
| |
| mutex_unlock(&bebob->mutex); |
| |
| return snd_pcm_lib_free_vmalloc_buffer(substream); |
| } |
| |
| static int |
| pcm_capture_prepare(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| int err; |
| |
| err = snd_bebob_stream_start_duplex(bebob); |
| if (err >= 0) |
| amdtp_stream_pcm_prepare(&bebob->tx_stream); |
| |
| return err; |
| } |
| static int |
| pcm_playback_prepare(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| int err; |
| |
| err = snd_bebob_stream_start_duplex(bebob); |
| if (err >= 0) |
| amdtp_stream_pcm_prepare(&bebob->rx_stream); |
| |
| return err; |
| } |
| |
| static int |
| pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); |
| break; |
| case SNDRV_PCM_TRIGGER_STOP: |
| amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| static int |
| pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); |
| break; |
| case SNDRV_PCM_TRIGGER_STOP: |
| amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static snd_pcm_uframes_t |
| pcm_capture_pointer(struct snd_pcm_substream *sbstrm) |
| { |
| struct snd_bebob *bebob = sbstrm->private_data; |
| return amdtp_stream_pcm_pointer(&bebob->tx_stream); |
| } |
| static snd_pcm_uframes_t |
| pcm_playback_pointer(struct snd_pcm_substream *sbstrm) |
| { |
| struct snd_bebob *bebob = sbstrm->private_data; |
| return amdtp_stream_pcm_pointer(&bebob->rx_stream); |
| } |
| |
| static int pcm_capture_ack(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| |
| return amdtp_stream_pcm_ack(&bebob->tx_stream); |
| } |
| |
| static int pcm_playback_ack(struct snd_pcm_substream *substream) |
| { |
| struct snd_bebob *bebob = substream->private_data; |
| |
| return amdtp_stream_pcm_ack(&bebob->rx_stream); |
| } |
| |
| int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) |
| { |
| static const struct snd_pcm_ops capture_ops = { |
| .open = pcm_open, |
| .close = pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = pcm_hw_params, |
| .hw_free = pcm_hw_free, |
| .prepare = pcm_capture_prepare, |
| .trigger = pcm_capture_trigger, |
| .pointer = pcm_capture_pointer, |
| .ack = pcm_capture_ack, |
| .page = snd_pcm_lib_get_vmalloc_page, |
| }; |
| static const struct snd_pcm_ops playback_ops = { |
| .open = pcm_open, |
| .close = pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = pcm_hw_params, |
| .hw_free = pcm_hw_free, |
| .prepare = pcm_playback_prepare, |
| .trigger = pcm_playback_trigger, |
| .pointer = pcm_playback_pointer, |
| .ack = pcm_playback_ack, |
| .page = snd_pcm_lib_get_vmalloc_page, |
| }; |
| struct snd_pcm *pcm; |
| int err; |
| |
| err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); |
| if (err < 0) |
| goto end; |
| |
| pcm->private_data = bebob; |
| snprintf(pcm->name, sizeof(pcm->name), |
| "%s PCM", bebob->card->shortname); |
| snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); |
| snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); |
| end: |
| return err; |
| } |