84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <sound/asound.h>
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#include "digi00x.h"
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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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fw_send_response(card, request, RCODE_COMPLETE);
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if (offset == dg00x->async_handler.offset)
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handle_unknown_message(dg00x, offset, buf);
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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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/* 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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return 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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}
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void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
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{
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if (dg00x->async_handler.callback_data == NULL)
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return;
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fw_core_remove_address_handler(&dg00x->async_handler);
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dg00x->async_handler.callback_data = NULL;
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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 = 4;
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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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snd_dg00x_transaction_unregister(dg00x);
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return err;
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}
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