- 根目录:
- sound
- firewire
- bebob
- bebob_pcm.c
/*
* bebob_pcm.c - a part of driver for BeBoB based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#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 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; /* bytes 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
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;
runtime->hw.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;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
s = &bebob->tx_stream;
formations = bebob->tx_stream_formations;
} else {
runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
s = &bebob->rx_stream;
formations = bebob->rx_stream_formations;
}
limit_channels_and_rates(&runtime->hw, formations);
limit_period_and_buffer(&runtime->hw);
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_stream_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;
struct snd_bebob_rate_spec *spec = bebob->spec->rate;
unsigned int sampling_rate;
bool internal;
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_check_internal_clock(bebob, &internal);
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 (!internal ||
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_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_bebob *bebob = substream->private_data;
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
atomic_inc(&bebob->capture_substreams);
amdtp_stream_set_pcm_format(&bebob->tx_stream,
params_format(hw_params));
return snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
}
static int
pcm_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_bebob *bebob = substream->private_data;
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
atomic_inc(&bebob->playback_substreams);
amdtp_stream_set_pcm_format(&bebob->rx_stream,
params_format(hw_params));
return snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
}
static int
pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
struct snd_bebob *bebob = substream->private_data;
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
atomic_dec(&bebob->capture_substreams);
snd_bebob_stream_stop_duplex(bebob);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int
pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_bebob *bebob = substream->private_data;
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
atomic_dec(&bebob->playback_substreams);
snd_bebob_stream_stop_duplex(bebob);
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;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
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;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
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 const struct snd_pcm_ops pcm_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 pcm_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,
};
int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
{
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, &pcm_playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
end:
return err;
}