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-rw-r--r--sound/firewire/motu/motu-register-dsp-message-parser.c420
1 files changed, 420 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu-register-dsp-message-parser.c b/sound/firewire/motu/motu-register-dsp-message-parser.c
new file mode 100644
index 000000000..0c5875675
--- /dev/null
+++ b/sound/firewire/motu/motu-register-dsp-message-parser.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// motu-register-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 functions by asynchronous transaction
+// to access their internal registers.
+// * 828 mk2
+// * 896hd
+// * Traveler
+// * 8 pre
+// * Ultralite
+// * 4 pre
+// * Audio Express
+//
+// Additionally, isochronous packets from the above models include messages to notify state of
+// DSP. The messages are two set of 3 byte data in 2nd and 3rd quadlet of data block. When user
+// operates hardware components such as dial and switch, corresponding messages are transferred.
+// The messages include Hardware metering and MIDI messages as well.
+
+#include "motu.h"
+
+#define MSG_FLAG_POS 4
+#define MSG_FLAG_TYPE_MASK 0xf8
+#define MSG_FLAG_MIDI_MASK 0x01
+#define MSG_FLAG_MODEL_SPECIFIC_MASK 0x06
+#define MSG_FLAG_8PRE 0x00
+#define MSG_FLAG_ULTRALITE 0x04
+#define MSG_FLAG_TRAVELER 0x04
+#define MSG_FLAG_828MK2 0x04
+#define MSG_FLAG_896HD 0x04
+#define MSG_FLAG_4PRE 0x05 // MIDI mask is in 8th byte.
+#define MSG_FLAG_AUDIOEXPRESS 0x05 // MIDI mask is in 8th byte.
+#define MSG_FLAG_TYPE_SHIFT 3
+#define MSG_VALUE_POS 5
+#define MSG_MIDI_BYTE_POS 6
+#define MSG_METER_IDX_POS 7
+
+// In 4 pre and Audio express, meter index is in 6th byte. MIDI flag is in 8th byte and MIDI byte
+// is in 7th byte.
+#define MSG_METER_IDX_POS_4PRE_AE 6
+#define MSG_MIDI_BYTE_POS_4PRE_AE 7
+#define MSG_FLAG_MIDI_POS_4PRE_AE 8
+
+enum register_dsp_msg_type {
+ // Used for messages with no information.
+ INVALID = 0x00,
+ MIXER_SELECT = 0x01,
+ MIXER_SRC_GAIN = 0x02,
+ MIXER_SRC_PAN = 0x03,
+ MIXER_SRC_FLAG = 0x04,
+ MIXER_OUTPUT_PAIRED_VOLUME = 0x05,
+ MIXER_OUTPUT_PAIRED_FLAG = 0x06,
+ MAIN_OUTPUT_PAIRED_VOLUME = 0x07,
+ HP_OUTPUT_PAIRED_VOLUME = 0x08,
+ HP_OUTPUT_PAIRED_ASSIGNMENT = 0x09,
+ // Transferred by all models but the purpose is still unknown.
+ UNKNOWN_0 = 0x0a,
+ // Specific to 828mk2, 896hd, Traveler.
+ UNKNOWN_2 = 0x0c,
+ // Specific to 828mk2, Traveler, and 896hd (not functional).
+ LINE_INPUT_BOOST = 0x0d,
+ // Specific to 828mk2, Traveler, and 896hd (not functional).
+ LINE_INPUT_NOMINAL_LEVEL = 0x0e,
+ // Specific to Ultralite, 4 pre, Audio express, and 8 pre (not functional).
+ INPUT_GAIN_AND_INVERT = 0x15,
+ // Specific to 4 pre, and Audio express.
+ INPUT_FLAG = 0x16,
+ // Specific to 4 pre, and Audio express.
+ MIXER_SRC_PAIRED_BALANCE = 0x17,
+ // Specific to 4 pre, and Audio express.
+ MIXER_SRC_PAIRED_WIDTH = 0x18,
+ // Transferred by all models. This type of message interposes the series of the other
+ // messages. The message delivers signal level up to 96.0 kHz. In 828mk2, 896hd, and
+ // Traveler, one of physical outputs is selected for the message. The selection is done
+ // by LSB one byte in asynchronous write quadlet transaction to 0x'ffff'f000'0b2c.
+ METER = 0x1f,
+};
+
+#define EVENT_QUEUE_SIZE 16
+
+struct msg_parser {
+ spinlock_t lock;
+ struct snd_firewire_motu_register_dsp_meter meter;
+ bool meter_pos_quirk;
+
+ struct snd_firewire_motu_register_dsp_parameter param;
+ u8 prev_mixer_src_type;
+ u8 mixer_ch;
+ u8 mixer_src_ch;
+
+ u8 input_ch;
+ u8 prev_msg_type;
+
+ u32 event_queue[EVENT_QUEUE_SIZE];
+ unsigned int push_pos;
+ unsigned int pull_pos;
+};
+
+int snd_motu_register_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);
+ if (motu->spec == &snd_motu_spec_4pre || motu->spec == &snd_motu_spec_audio_express)
+ parser->meter_pos_quirk = true;
+ motu->message_parser = parser;
+ return 0;
+}
+
+int snd_motu_register_dsp_message_parser_init(struct snd_motu *motu)
+{
+ struct msg_parser *parser = motu->message_parser;
+
+ parser->prev_mixer_src_type = INVALID;
+ parser->mixer_ch = 0xff;
+ parser->mixer_src_ch = 0xff;
+ parser->prev_msg_type = INVALID;
+
+ return 0;
+}
+
+// Rough implementaion of queue without overrun check.
+static void queue_event(struct snd_motu *motu, u8 msg_type, u8 identifier0, u8 identifier1, u8 val)
+{
+ struct msg_parser *parser = motu->message_parser;
+ unsigned int pos = parser->push_pos;
+ u32 entry;
+
+ if (!motu->hwdep || motu->hwdep->used == 0)
+ return;
+
+ entry = (msg_type << 24) | (identifier0 << 16) | (identifier1 << 8) | val;
+ parser->event_queue[pos] = entry;
+
+ ++pos;
+ if (pos >= EVENT_QUEUE_SIZE)
+ pos = 0;
+ parser->push_pos = pos;
+}
+
+void snd_motu_register_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;
+ bool meter_pos_quirk = parser->meter_pos_quirk;
+ unsigned int pos = parser->push_pos;
+ 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;
+ u8 msg_type = (b[MSG_FLAG_POS] & MSG_FLAG_TYPE_MASK) >> MSG_FLAG_TYPE_SHIFT;
+ u8 val = b[MSG_VALUE_POS];
+
+ buffer += data_block_quadlets;
+
+ switch (msg_type) {
+ case MIXER_SELECT:
+ {
+ u8 mixer_ch = val / 0x20;
+ if (mixer_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT) {
+ parser->mixer_src_ch = 0;
+ parser->mixer_ch = mixer_ch;
+ }
+ break;
+ }
+ case MIXER_SRC_GAIN:
+ case MIXER_SRC_PAN:
+ case MIXER_SRC_FLAG:
+ case MIXER_SRC_PAIRED_BALANCE:
+ case MIXER_SRC_PAIRED_WIDTH:
+ {
+ struct snd_firewire_motu_register_dsp_parameter *param = &parser->param;
+ u8 mixer_ch = parser->mixer_ch;
+ u8 mixer_src_ch = parser->mixer_src_ch;
+
+ if (msg_type != parser->prev_mixer_src_type)
+ mixer_src_ch = 0;
+ else
+ ++mixer_src_ch;
+ parser->prev_mixer_src_type = msg_type;
+
+ if (mixer_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT &&
+ mixer_src_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT) {
+ u8 mixer_ch = parser->mixer_ch;
+
+ switch (msg_type) {
+ case MIXER_SRC_GAIN:
+ if (param->mixer.source[mixer_ch].gain[mixer_src_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val);
+ param->mixer.source[mixer_ch].gain[mixer_src_ch] = val;
+ }
+ break;
+ case MIXER_SRC_PAN:
+ if (param->mixer.source[mixer_ch].pan[mixer_src_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val);
+ param->mixer.source[mixer_ch].pan[mixer_src_ch] = val;
+ }
+ break;
+ case MIXER_SRC_FLAG:
+ if (param->mixer.source[mixer_ch].flag[mixer_src_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val);
+ param->mixer.source[mixer_ch].flag[mixer_src_ch] = val;
+ }
+ break;
+ case MIXER_SRC_PAIRED_BALANCE:
+ if (param->mixer.source[mixer_ch].paired_balance[mixer_src_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val);
+ param->mixer.source[mixer_ch].paired_balance[mixer_src_ch] = val;
+ }
+ break;
+ case MIXER_SRC_PAIRED_WIDTH:
+ if (param->mixer.source[mixer_ch].paired_width[mixer_src_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val);
+ param->mixer.source[mixer_ch].paired_width[mixer_src_ch] = val;
+ }
+ break;
+ default:
+ break;
+ }
+
+ parser->mixer_src_ch = mixer_src_ch;
+ }
+ break;
+ }
+ case MIXER_OUTPUT_PAIRED_VOLUME:
+ case MIXER_OUTPUT_PAIRED_FLAG:
+ {
+ struct snd_firewire_motu_register_dsp_parameter *param = &parser->param;
+ u8 mixer_ch = parser->mixer_ch;
+
+ if (mixer_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT) {
+ switch (msg_type) {
+ case MIXER_OUTPUT_PAIRED_VOLUME:
+ if (param->mixer.output.paired_volume[mixer_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, 0, val);
+ param->mixer.output.paired_volume[mixer_ch] = val;
+ }
+ break;
+ case MIXER_OUTPUT_PAIRED_FLAG:
+ if (param->mixer.output.paired_flag[mixer_ch] != val) {
+ queue_event(motu, msg_type, mixer_ch, 0, val);
+ param->mixer.output.paired_flag[mixer_ch] = val;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ break;
+ }
+ case MAIN_OUTPUT_PAIRED_VOLUME:
+ if (parser->param.output.main_paired_volume != val) {
+ queue_event(motu, msg_type, 0, 0, val);
+ parser->param.output.main_paired_volume = val;
+ }
+ break;
+ case HP_OUTPUT_PAIRED_VOLUME:
+ if (parser->param.output.hp_paired_volume != val) {
+ queue_event(motu, msg_type, 0, 0, val);
+ parser->param.output.hp_paired_volume = val;
+ }
+ break;
+ case HP_OUTPUT_PAIRED_ASSIGNMENT:
+ if (parser->param.output.hp_paired_assignment != val) {
+ queue_event(motu, msg_type, 0, 0, val);
+ parser->param.output.hp_paired_assignment = val;
+ }
+ break;
+ case LINE_INPUT_BOOST:
+ if (parser->param.line_input.boost_flag != val) {
+ queue_event(motu, msg_type, 0, 0, val);
+ parser->param.line_input.boost_flag = val;
+ }
+ break;
+ case LINE_INPUT_NOMINAL_LEVEL:
+ if (parser->param.line_input.nominal_level_flag != val) {
+ queue_event(motu, msg_type, 0, 0, val);
+ parser->param.line_input.nominal_level_flag = val;
+ }
+ break;
+ case INPUT_GAIN_AND_INVERT:
+ case INPUT_FLAG:
+ {
+ struct snd_firewire_motu_register_dsp_parameter *param = &parser->param;
+ u8 input_ch = parser->input_ch;
+
+ if (parser->prev_msg_type != msg_type)
+ input_ch = 0;
+ else
+ ++input_ch;
+
+ if (input_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_INPUT_COUNT) {
+ switch (msg_type) {
+ case INPUT_GAIN_AND_INVERT:
+ if (param->input.gain_and_invert[input_ch] != val) {
+ queue_event(motu, msg_type, input_ch, 0, val);
+ param->input.gain_and_invert[input_ch] = val;
+ }
+ break;
+ case INPUT_FLAG:
+ if (param->input.flag[input_ch] != val) {
+ queue_event(motu, msg_type, input_ch, 0, val);
+ param->input.flag[input_ch] = val;
+ }
+ break;
+ default:
+ break;
+ }
+ parser->input_ch = input_ch;
+ }
+ break;
+ }
+ case UNKNOWN_0:
+ case UNKNOWN_2:
+ break;
+ case METER:
+ {
+ u8 pos;
+
+ if (!meter_pos_quirk)
+ pos = b[MSG_METER_IDX_POS];
+ else
+ pos = b[MSG_METER_IDX_POS_4PRE_AE];
+
+ if (pos < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT) {
+ parser->meter.data[pos] = val;
+ } else if (pos >= 0x80) {
+ pos -= (0x80 - SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT);
+
+ if (pos < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT)
+ parser->meter.data[pos] = val;
+ }
+
+ // The message for meter is interruptible to the series of other
+ // types of messages. Don't cache it.
+ fallthrough;
+ }
+ case INVALID:
+ default:
+ // Don't cache it.
+ continue;
+ }
+
+ parser->prev_msg_type = msg_type;
+ }
+ }
+
+ if (pos != parser->push_pos)
+ wake_up(&motu->hwdep_wait);
+
+ spin_unlock_irqrestore(&parser->lock, flags);
+}
+
+void snd_motu_register_dsp_message_parser_copy_meter(struct snd_motu *motu,
+ struct snd_firewire_motu_register_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);
+}
+
+void snd_motu_register_dsp_message_parser_copy_parameter(struct snd_motu *motu,
+ struct snd_firewire_motu_register_dsp_parameter *param)
+{
+ struct msg_parser *parser = motu->message_parser;
+ unsigned long flags;
+
+ spin_lock_irqsave(&parser->lock, flags);
+ memcpy(param, &parser->param, sizeof(*param));
+ spin_unlock_irqrestore(&parser->lock, flags);
+}
+
+unsigned int snd_motu_register_dsp_message_parser_count_event(struct snd_motu *motu)
+{
+ struct msg_parser *parser = motu->message_parser;
+
+ if (parser->pull_pos > parser->push_pos)
+ return EVENT_QUEUE_SIZE - parser->pull_pos + parser->push_pos;
+ else
+ return parser->push_pos - parser->pull_pos;
+}
+
+bool snd_motu_register_dsp_message_parser_copy_event(struct snd_motu *motu, u32 *event)
+{
+ struct msg_parser *parser = motu->message_parser;
+ unsigned int pos = parser->pull_pos;
+ unsigned long flags;
+
+ if (pos == parser->push_pos)
+ return false;
+
+ spin_lock_irqsave(&parser->lock, flags);
+
+ *event = parser->event_queue[pos];
+
+ ++pos;
+ if (pos >= EVENT_QUEUE_SIZE)
+ pos = 0;
+ parser->pull_pos = pos;
+
+ spin_unlock_irqrestore(&parser->lock, flags);
+
+ return true;
+}