diff options
Diffstat (limited to 'sound/firewire/motu/motu-command-dsp-message-parser.c')
| -rw-r--r-- | sound/firewire/motu/motu-command-dsp-message-parser.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu-command-dsp-message-parser.c b/sound/firewire/motu/motu-command-dsp-message-parser.c new file mode 100644 index 000000000..9efe4d364 --- /dev/null +++ b/sound/firewire/motu/motu-command-dsp-message-parser.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// motu-command-dsp-message-parser.c - a part of driver for MOTU FireWire series +// +// Copyright (c) 2021 Takashi Sakamoto <o-takashi@sakamocchi.jp> + +// Below models allow software to configure their DSP function by command transferred in +// asynchronous transaction: +// * 828 mk3 (FireWire only and Hybrid) +// * 896 mk3 (FireWire only and Hybrid) +// * Ultralite mk3 (FireWire only and Hybrid) +// * Traveler mk3 +// * Track 16 +// +// Isochronous packets from the above models includes messages to report state of hardware meter. + +#include "motu.h" + +enum msg_parser_state { + INITIALIZED, + FRAGMENT_DETECTED, + AVAILABLE, +}; + +struct msg_parser { + spinlock_t lock; + enum msg_parser_state state; + unsigned int interval; + unsigned int message_count; + unsigned int fragment_pos; + unsigned int value_index; + u64 value; + struct snd_firewire_motu_command_dsp_meter meter; +}; + +int snd_motu_command_dsp_message_parser_new(struct snd_motu *motu) +{ + struct msg_parser *parser; + + parser = devm_kzalloc(&motu->card->card_dev, sizeof(*parser), GFP_KERNEL); + if (!parser) + return -ENOMEM; + spin_lock_init(&parser->lock); + motu->message_parser = parser; + + return 0; +} + +int snd_motu_command_dsp_message_parser_init(struct snd_motu *motu, enum cip_sfc sfc) +{ + struct msg_parser *parser = motu->message_parser; + + parser->state = INITIALIZED; + + // All of data blocks don't have messages with meaningful information. + switch (sfc) { + case CIP_SFC_176400: + case CIP_SFC_192000: + parser->interval = 4; + break; + case CIP_SFC_88200: + case CIP_SFC_96000: + parser->interval = 2; + break; + case CIP_SFC_32000: + case CIP_SFC_44100: + case CIP_SFC_48000: + default: + parser->interval = 1; + break; + } + + return 0; +} + +#define FRAGMENT_POS 6 +#define MIDI_BYTE_POS 7 +#define MIDI_FLAG_POS 8 +// One value of hardware meter consists of 4 messages. +#define FRAGMENTS_PER_VALUE 4 +#define VALUES_AT_IMAGE_END 0xffffffffffffffff + +void snd_motu_command_dsp_message_parser_parse(struct snd_motu *motu, const struct pkt_desc *descs, + unsigned int desc_count, unsigned int data_block_quadlets) +{ + struct msg_parser *parser = motu->message_parser; + unsigned int interval = parser->interval; + unsigned long flags; + int i; + + spin_lock_irqsave(&parser->lock, flags); + + for (i = 0; i < desc_count; ++i) { + const struct pkt_desc *desc = descs + i; + __be32 *buffer = desc->ctx_payload; + unsigned int data_blocks = desc->data_blocks; + int j; + + for (j = 0; j < data_blocks; ++j) { + u8 *b = (u8 *)buffer; + buffer += data_block_quadlets; + + switch (parser->state) { + case INITIALIZED: + { + u8 fragment = b[FRAGMENT_POS]; + + if (fragment > 0) { + parser->value = fragment; + parser->message_count = 1; + parser->state = FRAGMENT_DETECTED; + } + break; + } + case FRAGMENT_DETECTED: + { + if (parser->message_count % interval == 0) { + u8 fragment = b[FRAGMENT_POS]; + + parser->value >>= 8; + parser->value |= (u64)fragment << 56; + + if (parser->value == VALUES_AT_IMAGE_END) { + parser->state = AVAILABLE; + parser->fragment_pos = 0; + parser->value_index = 0; + parser->message_count = 0; + } + } + ++parser->message_count; + break; + } + case AVAILABLE: + default: + { + if (parser->message_count % interval == 0) { + u8 fragment = b[FRAGMENT_POS]; + + parser->value >>= 8; + parser->value |= (u64)fragment << 56; + ++parser->fragment_pos; + + if (parser->fragment_pos == 4) { + // Skip the last two quadlets since they could be + // invalid value (0xffffffff) as floating point + // number. + if (parser->value_index < + SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT - 2) { + u32 val = (u32)(parser->value >> 32); + parser->meter.data[parser->value_index] = val; + } + ++parser->value_index; + parser->fragment_pos = 0; + } + + if (parser->value == VALUES_AT_IMAGE_END) { + parser->value_index = 0; + parser->fragment_pos = 0; + parser->message_count = 0; + } + } + ++parser->message_count; + break; + } + } + } + } + + spin_unlock_irqrestore(&parser->lock, flags); +} + +void snd_motu_command_dsp_message_parser_copy_meter(struct snd_motu *motu, + struct snd_firewire_motu_command_dsp_meter *meter) +{ + struct msg_parser *parser = motu->message_parser; + unsigned long flags; + + spin_lock_irqsave(&parser->lock, flags); + memcpy(meter, &parser->meter, sizeof(*meter)); + spin_unlock_irqrestore(&parser->lock, flags); +} |