linux/sound/firewire/dice/dice-pcm.c
Julia Lawall 5116ffc32d ALSA: firewire: constify snd_pcm_ops structures
Check for snd_pcm_ops structures that are only stored in the ops field of a
snd_soc_platform_driver structure or passed as the third argument to
snd_pcm_set_ops.  The corresponding field or parameter is declared const,
so snd_pcm_ops structures that have this property can be declared as const
also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct snd_pcm_ops i@p = { ... };

@ok1@
identifier r.i;
struct snd_soc_platform_driver e;
position p;
@@
e.ops = &i@p;

@ok2@
identifier r.i;
expression e1, e2;
position p;
@@
snd_pcm_set_ops(e1, e2, &i@p)

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
struct snd_pcm_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct snd_pcm_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-09-02 11:50:11 +02:00

379 lines
9.5 KiB
C

/*
* 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 limit_channels_and_rates(struct snd_dice *dice,
struct snd_pcm_runtime *runtime,
enum amdtp_stream_direction dir,
unsigned int index, unsigned int size)
{
struct snd_pcm_hardware *hw = &runtime->hw;
struct amdtp_stream *stream;
unsigned int rate;
__be32 reg;
int err;
/*
* Retrieve current Multi Bit Linear Audio data channel and limit to
* it.
*/
if (dir == AMDTP_IN_STREAM) {
stream = &dice->tx_stream[index];
err = snd_dice_transaction_read_tx(dice,
size * index + TX_NUMBER_AUDIO,
&reg, sizeof(reg));
} else {
stream = &dice->rx_stream[index];
err = snd_dice_transaction_read_rx(dice,
size * index + RX_NUMBER_AUDIO,
&reg, sizeof(reg));
}
if (err < 0)
return err;
hw->channels_min = hw->channels_max = be32_to_cpu(reg);
/* Retrieve current sampling transfer frequency and limit to it. */
err = snd_dice_transaction_get_rate(dice, &rate);
if (err < 0)
return err;
hw->rates = snd_pcm_rate_to_rate_bit(rate);
snd_pcm_limit_hw_rates(runtime);
return 0;
}
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;
enum amdtp_stream_direction dir;
struct amdtp_stream *stream;
__be32 reg[2];
unsigned int count, size;
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 = AM824_IN_PCM_FORMAT_BITS;
dir = AMDTP_IN_STREAM;
stream = &dice->tx_stream[substream->pcm->device];
err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
sizeof(reg));
} else {
hw->formats = AM824_OUT_PCM_FORMAT_BITS;
dir = AMDTP_OUT_STREAM;
stream = &dice->rx_stream[substream->pcm->device];
err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
sizeof(reg));
}
if (err < 0)
return err;
count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
if (substream->pcm->device >= count)
return -ENXIO;
size = be32_to_cpu(reg[1]) * 4;
err = limit_channels_and_rates(dice, substream->runtime, dir,
substream->pcm->device, size);
if (err < 0)
return err;
limit_period_and_buffer(hw);
return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
}
static int pcm_open(struct snd_pcm_substream *substream)
{
struct snd_dice *dice = substream->private_data;
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;
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;
struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
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(&dice->mutex);
dice->substreams_counter++;
mutex_unlock(&dice->mutex);
}
amdtp_am824_set_pcm_format(stream, params_format(hw_params));
return 0;
}
static int playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_dice *dice = substream->private_data;
struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
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(&dice->mutex);
dice->substreams_counter++;
mutex_unlock(&dice->mutex);
}
amdtp_am824_set_pcm_format(stream, params_format(hw_params));
return 0;
}
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;
struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
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(stream);
return 0;
}
static int playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_dice *dice = substream->private_data;
struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
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(stream);
return err;
}
static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_dice *dice = substream->private_data;
struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
amdtp_stream_pcm_trigger(stream, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
amdtp_stream_pcm_trigger(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;
struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
amdtp_stream_pcm_trigger(stream, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
amdtp_stream_pcm_trigger(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;
struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
return amdtp_stream_pcm_pointer(stream);
}
static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
{
struct snd_dice *dice = substream->private_data;
struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
return amdtp_stream_pcm_pointer(stream);
}
int snd_dice_create_pcm(struct snd_dice *dice)
{
static const 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 const 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,
};
__be32 reg;
struct snd_pcm *pcm;
unsigned int i, max_capture, max_playback, capture, playback;
int err;
/* Check whether PCM substreams are required. */
if (dice->force_two_pcms) {
max_capture = max_playback = 2;
} else {
max_capture = max_playback = 0;
err = snd_dice_transaction_read_tx(dice, TX_NUMBER, &reg,
sizeof(reg));
if (err < 0)
return err;
max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
err = snd_dice_transaction_read_rx(dice, RX_NUMBER, &reg,
sizeof(reg));
if (err < 0)
return err;
max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
}
for (i = 0; i < MAX_STREAMS; i++) {
capture = playback = 0;
if (i < max_capture)
capture = 1;
if (i < max_playback)
playback = 1;
if (capture == 0 && playback == 0)
break;
err = snd_pcm_new(dice->card, "DICE", i, 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;
}