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Diffstat (limited to '')
| -rw-r--r-- | sound/firewire/fireface/amdtp-ff.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/sound/firewire/fireface/amdtp-ff.c b/sound/firewire/fireface/amdtp-ff.c new file mode 100644 index 000000000..77c7598b6 --- /dev/null +++ b/sound/firewire/fireface/amdtp-ff.c @@ -0,0 +1,155 @@ +/* + * amdtp-ff.c - a part of driver for RME Fireface series + * + * Copyright (c) 2015-2017 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +#include <sound/pcm.h> +#include "ff.h" + +struct amdtp_ff { + unsigned int pcm_channels; +}; + +int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate, + unsigned int pcm_channels) +{ + struct amdtp_ff *p = s->protocol; + unsigned int data_channels; + + if (amdtp_stream_running(s)) + return -EBUSY; + + p->pcm_channels = pcm_channels; + data_channels = pcm_channels; + + return amdtp_stream_set_parameters(s, rate, data_channels); +} + +static void write_pcm_s32(struct amdtp_stream *s, + struct snd_pcm_substream *pcm, + __le32 *buffer, unsigned int frames) +{ + struct amdtp_ff *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_le32(*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, + __le32 *buffer, unsigned int frames) +{ + struct amdtp_ff *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; + + for (i = 0; i < frames; ++i) { + for (c = 0; c < channels; ++c) { + *dst = le32_to_cpu(buffer[c]) & 0xffffff00; + dst++; + } + buffer += s->data_block_quadlets; + if (--remaining_frames == 0) + dst = (void *)runtime->dma_area; + } +} + +static void write_pcm_silence(struct amdtp_stream *s, + __le32 *buffer, unsigned int frames) +{ + struct amdtp_ff *p = s->protocol; + unsigned int i, c, channels = p->pcm_channels; + + for (i = 0; i < frames; ++i) { + for (c = 0; c < channels; ++c) + buffer[c] = cpu_to_le32(0x00000000); + buffer += s->data_block_quadlets; + } +} + +int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s, + struct snd_pcm_runtime *runtime) +{ + int err; + + 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 unsigned int process_rx_data_blocks(struct amdtp_stream *s, + __be32 *buffer, + unsigned int data_blocks, + unsigned int *syt) +{ + struct snd_pcm_substream *pcm = READ_ONCE(s->pcm); + unsigned int pcm_frames; + + if (pcm) { + write_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks); + pcm_frames = data_blocks; + } else { + write_pcm_silence(s, (__le32 *)buffer, data_blocks); + pcm_frames = 0; + } + + return pcm_frames; +} + +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 = READ_ONCE(s->pcm); + unsigned int pcm_frames; + + if (pcm) { + read_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks); + pcm_frames = data_blocks; + } else { + pcm_frames = 0; + } + + return pcm_frames; +} + +int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit, + enum amdtp_stream_direction dir) +{ + amdtp_stream_process_data_blocks_t process_data_blocks; + + if (dir == AMDTP_IN_STREAM) + process_data_blocks = process_tx_data_blocks; + else + process_data_blocks = process_rx_data_blocks; + + return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0, + process_data_blocks, sizeof(struct amdtp_ff)); +} |