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linux-stable/sound/firewire/digi00x/digi00x-pcm.c
Takashi Sakamoto a02cb8f8de ALSA: firewire: remove support for 16 bit PCM samples in playback substream 
In IEC 61883-6, AM824 is described as format of data block. In this
format, one data block consists of several data channels, which is aligned
to 32 bit. One data channel has 8 bit label field and 24 bit data field.
PCM frames are transferred in Multi Bit Linear Audio (MBLA) data channel.
This channel can include 16/20/24 bit PCM sample.

As long as I know, models which support IEC 61883-1/6 doesn't allow to
switch bit length of PCM sample in MBLA data channel. They always
transmit/receive PCM frames of 24 bit length. This can be seen for the
other models which support protocols similar to IEC 61883-1/6.

On the other hand, current drivers for these protocols supports 16 bit
length PCM sample in playback substream. In this case, PCM sample is put
into the MBLA data channel with 8 bit padding in LSB side. Although 16
bit PCM sample is major because it's in CD format, this doesn't represent
device capability as is.

This commit removes support for 16 bit PCM samples in playback substream.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-05-22 16:24:08 +02:00

366 lines
8.8 KiB
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/*
* digi00x-pcm.c - a part of driver for Digidesign Digi 002/003 family
*
* Copyright (c) 2014-2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "digi00x.h"
static int hw_rule_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
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_DG00X_RATE_COUNT; i++) {
if (!snd_interval_test(c,
snd_dg00x_stream_pcm_channels[i]))
continue;
t.min = min(t.min, snd_dg00x_stream_rates[i]);
t.max = max(t.max, snd_dg00x_stream_rates[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_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_DG00X_RATE_COUNT; i++) {
if (!snd_interval_test(r, snd_dg00x_stream_rates[i]))
continue;
t.min = min(t.min, snd_dg00x_stream_pcm_channels[i]);
t.max = max(t.max, snd_dg00x_stream_pcm_channels[i]);
}
return snd_interval_refine(c, &t);
}
static int pcm_init_hw_params(struct snd_dg00x *dg00x,
struct snd_pcm_substream *substream)
{
static const struct snd_pcm_hardware hardware = {
.info = SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_JOINT_DUPLEX |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID,
.rates = SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 |
SNDRV_PCM_RATE_88200 |
SNDRV_PCM_RATE_96000,
.rate_min = 44100,
.rate_max = 96000,
.channels_min = 10,
.channels_max = 18,
.period_bytes_min = 4 * 18,
.period_bytes_max = 4 * 18 * 2048,
.buffer_bytes_max = 4 * 18 * 2048 * 2,
.periods_min = 2,
.periods_max = UINT_MAX,
};
struct amdtp_stream *s;
int err;
substream->runtime->hw = hardware;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
s = &dg00x->tx_stream;
} else {
substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
s = &dg00x->rx_stream;
}
err = snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS,
hw_rule_channels, NULL,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate, NULL,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
return err;
return amdtp_dot_add_pcm_hw_constraints(s, substream->runtime);
}
static int pcm_open(struct snd_pcm_substream *substream)
{
struct snd_dg00x *dg00x = substream->private_data;
enum snd_dg00x_clock clock;
bool detect;
unsigned int rate;
int err;
err = snd_dg00x_stream_lock_try(dg00x);
if (err < 0)
goto end;
err = pcm_init_hw_params(dg00x, substream);
if (err < 0)
goto err_locked;
/* Check current clock source. */
err = snd_dg00x_stream_get_clock(dg00x, &clock);
if (err < 0)
goto err_locked;
if (clock != SND_DG00X_CLOCK_INTERNAL) {
err = snd_dg00x_stream_check_external_clock(dg00x, &detect);
if (err < 0)
goto err_locked;
if (!detect) {
err = -EBUSY;
goto err_locked;
}
}
if ((clock != SND_DG00X_CLOCK_INTERNAL) ||
amdtp_stream_pcm_running(&dg00x->rx_stream) ||
amdtp_stream_pcm_running(&dg00x->tx_stream)) {
err = snd_dg00x_stream_get_external_rate(dg00x, &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_dg00x_stream_lock_release(dg00x);
return err;
}
static int pcm_close(struct snd_pcm_substream *substream)
{
struct snd_dg00x *dg00x = substream->private_data;
snd_dg00x_stream_lock_release(dg00x);
return 0;
}
static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_dg00x *dg00x = 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) {
mutex_lock(&dg00x->mutex);
dg00x->substreams_counter++;
mutex_unlock(&dg00x->mutex);
}
return 0;
}
static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_dg00x *dg00x = 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) {
mutex_lock(&dg00x->mutex);
dg00x->substreams_counter++;
mutex_unlock(&dg00x->mutex);
}
return 0;
}
static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
struct snd_dg00x *dg00x = substream->private_data;
mutex_lock(&dg00x->mutex);
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
dg00x->substreams_counter--;
snd_dg00x_stream_stop_duplex(dg00x);
mutex_unlock(&dg00x->mutex);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_dg00x *dg00x = substream->private_data;
mutex_lock(&dg00x->mutex);
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
dg00x->substreams_counter--;
snd_dg00x_stream_stop_duplex(dg00x);
mutex_unlock(&dg00x->mutex);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int pcm_capture_prepare(struct snd_pcm_substream *substream)
{
struct snd_dg00x *dg00x = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
mutex_lock(&dg00x->mutex);
err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
if (err >= 0)
amdtp_stream_pcm_prepare(&dg00x->tx_stream);
mutex_unlock(&dg00x->mutex);
return err;
}
static int pcm_playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_dg00x *dg00x = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
mutex_lock(&dg00x->mutex);
err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
if (err >= 0) {
amdtp_stream_pcm_prepare(&dg00x->rx_stream);
amdtp_dot_reset(&dg00x->rx_stream);
}
mutex_unlock(&dg00x->mutex);
return err;
}
static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_dg00x *dg00x = substream->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
amdtp_stream_pcm_trigger(&dg00x->tx_stream, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
amdtp_stream_pcm_trigger(&dg00x->tx_stream, NULL);
break;
default:
return -EINVAL;
}
return 0;
}
static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_dg00x *dg00x = substream->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
amdtp_stream_pcm_trigger(&dg00x->rx_stream, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
amdtp_stream_pcm_trigger(&dg00x->rx_stream, NULL);
break;
default:
return -EINVAL;
}
return 0;
}
static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
{
struct snd_dg00x *dg00x = sbstrm->private_data;
return amdtp_stream_pcm_pointer(&dg00x->tx_stream);
}
static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
{
struct snd_dg00x *dg00x = sbstrm->private_data;
return amdtp_stream_pcm_pointer(&dg00x->rx_stream);
}
int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x)
{
static const struct snd_pcm_ops capture_ops = {
.open = pcm_open,
.close = pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = pcm_capture_hw_params,
.hw_free = pcm_capture_hw_free,
.prepare = pcm_capture_prepare,
.trigger = pcm_capture_trigger,
.pointer = pcm_capture_pointer,
.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_playback_hw_params,
.hw_free = pcm_playback_hw_free,
.prepare = pcm_playback_prepare,
.trigger = pcm_playback_trigger,
.pointer = pcm_playback_pointer,
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
struct snd_pcm *pcm;
int err;
err = snd_pcm_new(dg00x->card, dg00x->card->driver, 0, 1, 1, &pcm);
if (err < 0)
return err;
pcm->private_data = dg00x;
snprintf(pcm->name, sizeof(pcm->name),
"%s PCM", dg00x->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
return 0;
}
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