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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | /* * 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 = ACCESS_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 = ACCESS_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)); } |