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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/sound/firewire/digi00x/digi00x-pcm.c
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..
@@ -1,9 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * digi00x-pcm.c - a part of driver for Digidesign Digi 002/003 family
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  *
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  * Copyright (c) 2014-2015 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 "digi00x.h"
..
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@@ -101,14 +100,14 @@
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 static int pcm_open(struct snd_pcm_substream *substream)
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 {
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 	struct snd_dg00x *dg00x = substream->private_data;
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+	struct amdtp_domain *d = &dg00x->domain;
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 	enum snd_dg00x_clock clock;
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 	bool detect;
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-	unsigned int rate;
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 	int err;
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 	err = snd_dg00x_stream_lock_try(dg00x);
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 	if (err < 0)
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-		goto end;
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+		return err;
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 	err = pcm_init_hw_params(dg00x, substream);
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 	if (err < 0)
..
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@@ -128,19 +127,49 @@
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 		}
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 	}
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+	mutex_lock(&dg00x->mutex);
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+
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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 ((clock != SND_DG00X_CLOCK_INTERNAL) ||
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-	    amdtp_stream_pcm_running(&dg00x->rx_stream) ||
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-	    amdtp_stream_pcm_running(&dg00x->tx_stream)) {
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+	    (dg00x->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 rate;
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+
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 		err = snd_dg00x_stream_get_external_rate(dg00x, &rate);
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-		if (err < 0)
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+		if (err < 0) {
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+			mutex_unlock(&dg00x->mutex);
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 			goto err_locked;
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+		}
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 		substream->runtime->hw.rate_min = rate;
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 		substream->runtime->hw.rate_max = rate;
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+
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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(&dg00x->mutex);
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+				goto err_locked;
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+			}
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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(&dg00x->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(&dg00x->mutex);
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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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+
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+	return 0;
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 err_locked:
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 	snd_dg00x_stream_lock_release(dg00x);
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 	return err;
..
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@@ -155,87 +184,52 @@
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 	return 0;
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 }
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-static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
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-				 struct snd_pcm_hw_params *hw_params)
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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_dg00x *dg00x = substream->private_data;
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-	int err;
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-
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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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+	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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+
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 		mutex_lock(&dg00x->mutex);
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-		dg00x->substreams_counter++;
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+		err = snd_dg00x_stream_reserve_duplex(dg00x, rate,
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+					frames_per_period, frames_per_buffer);
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+		if (err >= 0)
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+			++dg00x->substreams_counter;
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 		mutex_unlock(&dg00x->mutex);
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 	}
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-	return 0;
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+	return err;
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 }
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-static int 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_dg00x *dg00x = substream->private_data;
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-	int err;
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-
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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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-
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-	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
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-		mutex_lock(&dg00x->mutex);
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-		dg00x->substreams_counter++;
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-		mutex_unlock(&dg00x->mutex);
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-	}
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-
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-	return 0;
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-}
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-
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-static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
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+static int pcm_hw_free(struct snd_pcm_substream *substream)
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 {
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 	struct snd_dg00x *dg00x = substream->private_data;
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 	mutex_lock(&dg00x->mutex);
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 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
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-		dg00x->substreams_counter--;
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+		--dg00x->substreams_counter;
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 	snd_dg00x_stream_stop_duplex(dg00x);
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 	mutex_unlock(&dg00x->mutex);
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-	return snd_pcm_lib_free_vmalloc_buffer(substream);
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-}
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-
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-static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
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-{
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-	struct snd_dg00x *dg00x = substream->private_data;
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-
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-	mutex_lock(&dg00x->mutex);
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-
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-	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
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-		dg00x->substreams_counter--;
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-
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-	snd_dg00x_stream_stop_duplex(dg00x);
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-
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-	mutex_unlock(&dg00x->mutex);
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-
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-	return snd_pcm_lib_free_vmalloc_buffer(substream);
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+	return 0;
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 }
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 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
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 {
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 	struct snd_dg00x *dg00x = substream->private_data;
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-	struct snd_pcm_runtime *runtime = substream->runtime;
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 	int err;
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 	mutex_lock(&dg00x->mutex);
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-	err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
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+	err = snd_dg00x_stream_start_duplex(dg00x);
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 	if (err >= 0)
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 		amdtp_stream_pcm_prepare(&dg00x->tx_stream);
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..
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@@ -247,12 +241,11 @@
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 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
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 {
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 	struct snd_dg00x *dg00x = substream->private_data;
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-	struct snd_pcm_runtime *runtime = substream->runtime;
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 	int err;
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 	mutex_lock(&dg00x->mutex);
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-	err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
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+	err = snd_dg00x_stream_start_duplex(dg00x);
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 	if (err >= 0) {
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 		amdtp_stream_pcm_prepare(&dg00x->rx_stream);
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 		amdtp_dot_reset(&dg00x->rx_stream);
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@@ -303,28 +296,28 @@
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 {
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 	struct snd_dg00x *dg00x = sbstrm->private_data;
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-	return amdtp_stream_pcm_pointer(&dg00x->tx_stream);
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+	return amdtp_domain_stream_pcm_pointer(&dg00x->domain, &dg00x->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_dg00x *dg00x = sbstrm->private_data;
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-	return amdtp_stream_pcm_pointer(&dg00x->rx_stream);
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+	return amdtp_domain_stream_pcm_pointer(&dg00x->domain, &dg00x->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_dg00x *dg00x = substream->private_data;
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-	return amdtp_stream_pcm_ack(&dg00x->tx_stream);
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+	return amdtp_domain_stream_pcm_ack(&dg00x->domain, &dg00x->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_dg00x *dg00x = substream->private_data;
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-	return amdtp_stream_pcm_ack(&dg00x->rx_stream);
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+	return amdtp_domain_stream_pcm_ack(&dg00x->domain, &dg00x->rx_stream);
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 }
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 int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x)
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@@ -332,26 +325,22 @@
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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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+		.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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-		.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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+		.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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-		.page		= snd_pcm_lib_get_vmalloc_page,
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 	};
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 	struct snd_pcm *pcm;
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 	int err;
..
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@@ -365,6 +354,7 @@
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 		 "%s PCM", dg00x->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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 	return 0;
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 }