156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
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* amdtp-ff.c - a part of driver for RME Fireface series
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*
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* Copyright (c) 2015-2017 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 <sound/pcm.h>
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#include "ff.h"
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struct amdtp_ff {
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unsigned int pcm_channels;
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};
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int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
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unsigned int pcm_channels)
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{
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struct amdtp_ff *p = s->protocol;
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unsigned int data_channels;
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if (amdtp_stream_running(s))
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return -EBUSY;
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p->pcm_channels = pcm_channels;
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data_channels = pcm_channels;
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return amdtp_stream_set_parameters(s, rate, data_channels);
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}
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static void write_pcm_s32(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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__le32 *buffer, unsigned int frames)
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{
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struct amdtp_ff *p = s->protocol;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, remaining_frames, i, c;
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const u32 *src;
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channels = p->pcm_channels;
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src = (void *)runtime->dma_area +
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frames_to_bytes(runtime, s->pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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buffer[c] = cpu_to_le32(*src);
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src++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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src = (void *)runtime->dma_area;
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}
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}
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static void read_pcm_s32(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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__le32 *buffer, unsigned int frames)
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{
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struct amdtp_ff *p = s->protocol;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, remaining_frames, i, c;
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u32 *dst;
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channels = p->pcm_channels;
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dst = (void *)runtime->dma_area +
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frames_to_bytes(runtime, s->pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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*dst = le32_to_cpu(buffer[c]) & 0xffffff00;
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dst++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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dst = (void *)runtime->dma_area;
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}
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}
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static void write_pcm_silence(struct amdtp_stream *s,
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__le32 *buffer, unsigned int frames)
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{
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struct amdtp_ff *p = s->protocol;
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unsigned int i, c, channels = p->pcm_channels;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c)
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buffer[c] = cpu_to_le32(0x00000000);
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buffer += s->data_block_quadlets;
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}
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}
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int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime)
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{
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int err;
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err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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if (err < 0)
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return err;
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return amdtp_stream_add_pcm_hw_constraints(s, runtime);
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}
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static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
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__be32 *buffer,
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unsigned int data_blocks,
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unsigned int *syt)
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{
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struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
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unsigned int pcm_frames;
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if (pcm) {
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write_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
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pcm_frames = data_blocks;
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} else {
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write_pcm_silence(s, (__le32 *)buffer, data_blocks);
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pcm_frames = 0;
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}
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return pcm_frames;
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}
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static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
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__be32 *buffer,
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unsigned int data_blocks,
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unsigned int *syt)
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{
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struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
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unsigned int pcm_frames;
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if (pcm) {
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read_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
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pcm_frames = data_blocks;
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} else {
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pcm_frames = 0;
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}
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return pcm_frames;
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}
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int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir)
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{
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amdtp_stream_process_data_blocks_t process_data_blocks;
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if (dir == AMDTP_IN_STREAM)
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process_data_blocks = process_tx_data_blocks;
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else
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process_data_blocks = process_rx_data_blocks;
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return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0,
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process_data_blocks, sizeof(struct amdtp_ff));
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}
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