138 строки
3.6 KiB
C
138 строки
3.6 KiB
C
/*
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* digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
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*
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* Copyright (c) 2014-2015 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include <sound/asound.h>
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#include "digi00x.h"
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static int fill_midi_message(struct snd_rawmidi_substream *substream, u8 *buf)
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{
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int bytes;
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buf[0] = 0x80;
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bytes = snd_rawmidi_transmit_peek(substream, buf + 1, 2);
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if (bytes >= 0)
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buf[3] = 0xc0 | bytes;
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return bytes;
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}
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static void handle_midi_control(struct snd_dg00x *dg00x, __be32 *buf,
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unsigned int length)
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{
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struct snd_rawmidi_substream *substream;
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unsigned int i;
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unsigned int len;
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u8 *b;
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substream = ACCESS_ONCE(dg00x->in_control);
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if (substream == NULL)
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return;
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length /= 4;
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for (i = 0; i < length; i++) {
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b = (u8 *)&buf[i];
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len = b[3] & 0xf;
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if (len > 0)
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snd_rawmidi_receive(dg00x->in_control, b + 1, len);
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}
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}
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static void handle_unknown_message(struct snd_dg00x *dg00x,
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unsigned long long offset, __be32 *buf)
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{
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unsigned long flags;
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spin_lock_irqsave(&dg00x->lock, flags);
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dg00x->msg = be32_to_cpu(*buf);
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spin_unlock_irqrestore(&dg00x->lock, flags);
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wake_up(&dg00x->hwdep_wait);
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}
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static void handle_message(struct fw_card *card, struct fw_request *request,
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int tcode, int destination, int source,
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int generation, unsigned long long offset,
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void *data, size_t length, void *callback_data)
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{
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struct snd_dg00x *dg00x = callback_data;
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__be32 *buf = (__be32 *)data;
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if (offset == dg00x->async_handler.offset)
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handle_unknown_message(dg00x, offset, buf);
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else if (offset == dg00x->async_handler.offset + 4)
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handle_midi_control(dg00x, buf, length);
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fw_send_response(card, request, RCODE_COMPLETE);
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}
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int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)
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{
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struct fw_device *device = fw_parent_device(dg00x->unit);
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__be32 data[2];
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int err;
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/* Unknown. 4bytes. */
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data[0] = cpu_to_be32((device->card->node_id << 16) |
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(dg00x->async_handler.offset >> 32));
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data[1] = cpu_to_be32(dg00x->async_handler.offset);
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err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
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&data, sizeof(data), 0);
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if (err < 0)
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return err;
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/* Asynchronous transactions for MIDI control message. */
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data[0] = cpu_to_be32((device->card->node_id << 16) |
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(dg00x->async_handler.offset >> 32));
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data[1] = cpu_to_be32(dg00x->async_handler.offset + 4);
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return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
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DG00X_ADDR_BASE + DG00X_OFFSET_MIDI_CTL_ADDR,
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&data, sizeof(data), 0);
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}
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int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
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{
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static const struct fw_address_region resp_register_region = {
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.start = 0xffffe0000000ull,
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.end = 0xffffe000ffffull,
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};
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int err;
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dg00x->async_handler.length = 12;
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dg00x->async_handler.address_callback = handle_message;
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dg00x->async_handler.callback_data = dg00x;
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err = fw_core_add_address_handler(&dg00x->async_handler,
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&resp_register_region);
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if (err < 0)
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return err;
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err = snd_dg00x_transaction_reregister(dg00x);
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if (err < 0)
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goto error;
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err = snd_fw_async_midi_port_init(&dg00x->out_control, dg00x->unit,
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DG00X_ADDR_BASE + DG00X_OFFSET_MMC,
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4, fill_midi_message);
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if (err < 0)
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goto error;
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return err;
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error:
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fw_core_remove_address_handler(&dg00x->async_handler);
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dg00x->async_handler.address_callback = NULL;
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return err;
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}
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void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
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{
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snd_fw_async_midi_port_destroy(&dg00x->out_control);
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fw_core_remove_address_handler(&dg00x->async_handler);
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}
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