linux_dsm_epyc7002/sound/firewire/tascam/amdtp-tascam.c
Takashi Sakamoto 33b2e1442a ALSA: firewire-tascam: pick up data of state from tx isochronous pakcets
Units of TASCAM FireWire series multiplex PCM frames and state of
control surface into the same tx isochronous packets. One isochronous
packet includes a part of the state in a quadlet data. An image of the
state consists of 64 quadlet data.

This commit demultiplexes the state from tx isochronous packets.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-11-23 15:31:08 +01:00

201 lines
4.8 KiB
C

/*
* amdtp-tascam.c - a part of driver for TASCAM FireWire series
*
* Copyright (c) 2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include <sound/pcm.h>
#include "tascam.h"
#define AMDTP_FMT_TSCM_TX 0x1e
#define AMDTP_FMT_TSCM_RX 0x3e
struct amdtp_tscm {
unsigned int pcm_channels;
};
int amdtp_tscm_set_parameters(struct amdtp_stream *s, unsigned int rate)
{
struct amdtp_tscm *p = s->protocol;
unsigned int data_channels;
if (amdtp_stream_running(s))
return -EBUSY;
data_channels = p->pcm_channels;
/* Packets in in-stream have extra 2 data channels. */
if (s->direction == AMDTP_IN_STREAM)
data_channels += 2;
return amdtp_stream_set_parameters(s, rate, data_channels);
}
static void write_pcm_s32(struct amdtp_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames)
{
struct amdtp_tscm *p = s->protocol;
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int channels, remaining_frames, i, c;
const u32 *src;
channels = p->pcm_channels;
src = (void *)runtime->dma_area +
frames_to_bytes(runtime, s->pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
buffer[c] = cpu_to_be32(*src);
src++;
}
buffer += s->data_block_quadlets;
if (--remaining_frames == 0)
src = (void *)runtime->dma_area;
}
}
static void read_pcm_s32(struct amdtp_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames)
{
struct amdtp_tscm *p = s->protocol;
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int channels, remaining_frames, i, c;
u32 *dst;
channels = p->pcm_channels;
dst = (void *)runtime->dma_area +
frames_to_bytes(runtime, s->pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
/* The first data channel is for event counter. */
buffer += 1;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*dst = be32_to_cpu(buffer[c]);
dst++;
}
buffer += s->data_block_quadlets;
if (--remaining_frames == 0)
dst = (void *)runtime->dma_area;
}
}
static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer,
unsigned int data_blocks)
{
struct amdtp_tscm *p = s->protocol;
unsigned int channels, i, c;
channels = p->pcm_channels;
for (i = 0; i < data_blocks; ++i) {
for (c = 0; c < channels; ++c)
buffer[c] = 0x00000000;
buffer += s->data_block_quadlets;
}
}
int amdtp_tscm_add_pcm_hw_constraints(struct amdtp_stream *s,
struct snd_pcm_runtime *runtime)
{
int err;
/*
* Our implementation allows this protocol to deliver 24 bit sample in
* 32bit data channel.
*/
err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
if (err < 0)
return err;
return amdtp_stream_add_pcm_hw_constraints(s, runtime);
}
static void read_status_messages(struct amdtp_stream *s,
__be32 *buffer, unsigned int data_blocks)
{
struct snd_tscm *tscm = container_of(s, struct snd_tscm, tx_stream);
int i;
for (i = 0; i < data_blocks; i++) {
unsigned int index;
index = be32_to_cpu(buffer[0]) % SNDRV_FIREWIRE_TASCAM_STATE_COUNT;
tscm->state[index] = buffer[s->data_block_quadlets - 1];
buffer += s->data_block_quadlets;
}
}
static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
__be32 *buffer,
unsigned int data_blocks,
unsigned int *syt)
{
struct snd_pcm_substream *pcm;
pcm = READ_ONCE(s->pcm);
if (data_blocks > 0 && pcm)
read_pcm_s32(s, pcm, buffer, data_blocks);
read_status_messages(s, buffer, data_blocks);
return data_blocks;
}
static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
__be32 *buffer,
unsigned int data_blocks,
unsigned int *syt)
{
struct snd_pcm_substream *pcm;
/* This field is not used. */
*syt = 0x0000;
pcm = READ_ONCE(s->pcm);
if (pcm)
write_pcm_s32(s, pcm, buffer, data_blocks);
else
write_pcm_silence(s, buffer, data_blocks);
return data_blocks;
}
int amdtp_tscm_init(struct amdtp_stream *s, struct fw_unit *unit,
enum amdtp_stream_direction dir, unsigned int pcm_channels)
{
amdtp_stream_process_data_blocks_t process_data_blocks;
struct amdtp_tscm *p;
unsigned int fmt;
int err;
if (dir == AMDTP_IN_STREAM) {
fmt = AMDTP_FMT_TSCM_TX;
process_data_blocks = process_tx_data_blocks;
} else {
fmt = AMDTP_FMT_TSCM_RX;
process_data_blocks = process_rx_data_blocks;
}
err = amdtp_stream_init(s, unit, dir,
CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt,
process_data_blocks, sizeof(struct amdtp_tscm));
if (err < 0)
return 0;
/* Use fixed value for FDF field. */
s->fdf = 0x00;
/* This protocol uses fixed number of data channels for PCM samples. */
p = s->protocol;
p->pcm_channels = pcm_channels;
return 0;
}