ALSA: firewire-lib: Add support for channel mapping
Some devices arrange the position of PCM/MIDI data channel in AMDTP packet. This commit allows drivers to set channel mapping. To be simple, the mapping table is an array with fixed length. Then the number of channels for PCM is restricted by 64 channels. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -129,11 +129,12 @@ void amdtp_stream_set_parameters(struct amdtp_stream *s,
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[CIP_SFC_176400] = 176400,
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[CIP_SFC_192000] = 192000,
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};
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unsigned int sfc, midi_channels;
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unsigned int i, sfc, midi_channels;
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midi_channels = DIV_ROUND_UP(midi_ports, 8);
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if (WARN_ON(amdtp_stream_running(s)) ||
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if (WARN_ON(amdtp_stream_running(s)) |
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WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) |
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WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI))
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return;
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@ -148,11 +149,12 @@ sfc_found:
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if (s->dual_wire) {
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sfc -= 2;
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rate /= 2;
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pcm_channels *= 2;
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s->pcm_channels = pcm_channels * 2;
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} else {
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s->pcm_channels = pcm_channels;
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}
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s->sfc = sfc;
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s->data_block_quadlets = pcm_channels + midi_channels;
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s->pcm_channels = pcm_channels;
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s->data_block_quadlets = s->pcm_channels + midi_channels;
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s->midi_ports = midi_ports;
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s->syt_interval = amdtp_syt_intervals[sfc];
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@ -162,6 +164,11 @@ sfc_found:
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if (s->flags & CIP_BLOCKING)
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/* additional buffering needed to adjust for no-data packets */
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s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
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/* init the position map for PCM and MIDI channels */
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for (i = 0; i < pcm_channels; i++)
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s->pcm_positions[i] = i;
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s->midi_position = s->pcm_channels;
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}
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EXPORT_SYMBOL(amdtp_stream_set_parameters);
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@ -341,22 +348,21 @@ static void amdtp_write_s32(struct amdtp_stream *s,
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__be32 *buffer, unsigned int frames)
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{
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, remaining_frames, frame_step, i, c;
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unsigned int channels, remaining_frames, i, c;
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const u32 *src;
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channels = s->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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frame_step = s->data_block_quadlets - 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 = cpu_to_be32((*src >> 8) | 0x40000000);
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buffer[s->pcm_positions[c]] =
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cpu_to_be32((*src >> 8) | 0x40000000);
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src++;
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buffer++;
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}
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buffer += frame_step;
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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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@ -367,22 +373,21 @@ static void amdtp_write_s16(struct amdtp_stream *s,
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__be32 *buffer, unsigned int frames)
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{
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, remaining_frames, frame_step, i, c;
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unsigned int channels, remaining_frames, i, c;
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const u16 *src;
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channels = s->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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frame_step = s->data_block_quadlets - 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 = cpu_to_be32((*src << 8) | 0x40000000);
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buffer[s->pcm_positions[c]] =
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cpu_to_be32((*src << 8) | 0x40000000);
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src++;
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buffer++;
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}
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buffer += frame_step;
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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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@ -393,29 +398,29 @@ static void amdtp_write_s32_dualwire(struct amdtp_stream *s,
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__be32 *buffer, unsigned int frames)
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{
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, frame_adjust_1, frame_adjust_2, i, c;
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unsigned int channels, remaining_frames, i, c;
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const u32 *src;
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channels = s->pcm_channels;
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src = (void *)runtime->dma_area +
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s->pcm_buffer_pointer * (runtime->frame_bits / 8);
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frame_adjust_1 = channels - 1;
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frame_adjust_2 = 1 - (s->data_block_quadlets - channels);
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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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channels = s->pcm_channels / 2;
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channels /= 2;
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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 = cpu_to_be32((*src >> 8) | 0x40000000);
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buffer[s->pcm_positions[c] * 2] =
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cpu_to_be32((*src >> 8) | 0x40000000);
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src++;
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buffer += 2;
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}
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buffer -= frame_adjust_1;
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buffer += 1;
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for (c = 0; c < channels; ++c) {
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*buffer = cpu_to_be32((*src >> 8) | 0x40000000);
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buffer[s->pcm_positions[c] * 2] =
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cpu_to_be32((*src >> 8) | 0x40000000);
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src++;
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buffer += 2;
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}
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buffer -= frame_adjust_2;
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buffer += s->data_block_quadlets - 1;
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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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@ -424,29 +429,29 @@ static void amdtp_write_s16_dualwire(struct amdtp_stream *s,
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__be32 *buffer, unsigned int frames)
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{
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, frame_adjust_1, frame_adjust_2, i, c;
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unsigned int channels, remaining_frames, i, c;
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const u16 *src;
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channels = s->pcm_channels;
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src = (void *)runtime->dma_area +
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s->pcm_buffer_pointer * (runtime->frame_bits / 8);
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frame_adjust_1 = channels - 1;
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frame_adjust_2 = 1 - (s->data_block_quadlets - channels);
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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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channels = s->pcm_channels / 2;
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channels /= 2;
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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 = cpu_to_be32((*src << 8) | 0x40000000);
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buffer[s->pcm_positions[c] * 2] =
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cpu_to_be32((*src << 8) | 0x40000000);
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src++;
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buffer += 2;
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}
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buffer -= frame_adjust_1;
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buffer += 1;
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for (c = 0; c < channels; ++c) {
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*buffer = cpu_to_be32((*src << 8) | 0x40000000);
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buffer[s->pcm_positions[c] * 2] =
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cpu_to_be32((*src << 8) | 0x40000000);
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src++;
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buffer += 2;
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}
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buffer -= frame_adjust_2;
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buffer += s->data_block_quadlets - 1;
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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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@ -465,7 +470,7 @@ static void amdtp_read_s32(struct amdtp_stream *s,
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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 = be32_to_cpu(buffer[c]) << 8;
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*dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8;
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dst++;
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}
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buffer += s->data_block_quadlets;
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@ -489,12 +494,14 @@ static void amdtp_read_s32_dualwire(struct amdtp_stream *s,
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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 = be32_to_cpu(buffer[c * 2]) << 8;
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*dst =
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be32_to_cpu(buffer[s->pcm_positions[c] * 2]) << 8;
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dst++;
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}
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buffer += 1;
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for (c = 0; c < channels; ++c) {
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*dst = be32_to_cpu(buffer[c * 2]) << 8;
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*dst =
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be32_to_cpu(buffer[s->pcm_positions[c] * 2]) << 8;
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dst++;
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}
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buffer += s->data_block_quadlets - 1;
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@ -510,11 +517,26 @@ static void amdtp_fill_pcm_silence(struct amdtp_stream *s,
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < s->pcm_channels; ++c)
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buffer[c] = cpu_to_be32(0x40000000);
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buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000);
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buffer += s->data_block_quadlets;
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}
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}
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static void amdtp_fill_pcm_silence_dualwire(struct amdtp_stream *s,
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__be32 *buffer, unsigned int frames)
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{
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unsigned int i, c, channels;
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channels = s->pcm_channels / 2;
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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[s->pcm_positions[c] * 2] =
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buffer[s->pcm_positions[c] * 2 + 1] =
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cpu_to_be32(0x40000000);
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}
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buffer += s->data_block_quadlets;
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}
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}
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static void amdtp_fill_midi(struct amdtp_stream *s,
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__be32 *buffer, unsigned int frames)
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{
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@ -522,8 +544,8 @@ static void amdtp_fill_midi(struct amdtp_stream *s,
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u8 *b;
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for (f = 0; f < frames; f++) {
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buffer[s->pcm_channels + 1] = 0;
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b = (u8 *)&buffer[s->pcm_channels + 1];
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buffer[s->midi_position] = 0;
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b = (u8 *)&buffer[s->midi_position];
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port = (s->data_block_counter + f) % 8;
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if ((s->midi[port] == NULL) ||
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@ -545,7 +567,7 @@ static void amdtp_pull_midi(struct amdtp_stream *s,
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for (f = 0; f < frames; f++) {
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port = (s->data_block_counter + f) % 8;
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b = (u8 *)&buffer[s->pcm_channels + 1];
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b = (u8 *)&buffer[s->midi_position];
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len = b[0] - 0x80;
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if ((1 <= len) && (len <= 3) && (s->midi[port]))
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@ -652,6 +674,8 @@ static void handle_out_packet(struct amdtp_stream *s, unsigned int syt)
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pcm = ACCESS_ONCE(s->pcm);
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if (pcm)
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s->transfer_samples(s, pcm, buffer, data_blocks);
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else if (s->dual_wire)
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amdtp_fill_pcm_silence_dualwire(s, buffer, data_blocks);
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else
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amdtp_fill_pcm_silence(s, buffer, data_blocks);
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if (s->midi_ports)
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@ -683,7 +707,7 @@ static void handle_in_packet(struct amdtp_stream *s,
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/*
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* This module supports 'Two-quadlet CIP header with SYT field'.
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* For convinience, also check FMT field is AM824 or not.
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* For convenience, also check FMT field is AM824 or not.
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*/
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if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
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((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) ||
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@ -50,6 +50,12 @@ enum cip_sfc {
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SNDRV_PCM_FMTBIT_S32)
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/*
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* This module supports maximum 64 PCM channels for one PCM stream
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* This is for our convenience.
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*/
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#define AMDTP_MAX_CHANNELS_FOR_PCM 64
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/*
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* AMDTP packet can include channels for MIDI conformant data.
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* Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
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@ -85,6 +91,8 @@ struct amdtp_stream {
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void (*transfer_samples)(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames);
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u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
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u8 midi_position;
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unsigned int syt_interval;
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unsigned int transfer_delay;
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