// SPDX-License-Identifier: GPL-2.0-only
/*
 * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
 *
 * Copyright (c) 2014-2015 Takashi Sakamoto
 */

#include <sound/asound.h>
#include "digi00x.h"

static void handle_unknown_message(struct snd_dg00x *dg00x,
                                   unsigned long long offset, __be32 *buf)
{
        scoped_guard(spinlock_irqsave, &dg00x->lock) {
                dg00x->msg = be32_to_cpu(*buf);
        }

        wake_up(&dg00x->hwdep_wait);
}

static void handle_message(struct fw_card *card, struct fw_request *request,
                           int tcode, int destination, int source,
                           int generation, unsigned long long offset,
                           void *data, size_t length, void *callback_data)
{
        struct snd_dg00x *dg00x = callback_data;
        __be32 *buf = (__be32 *)data;

        fw_send_response(card, request, RCODE_COMPLETE);

        if (offset == dg00x->async_handler.offset)
                handle_unknown_message(dg00x, offset, buf);
}

int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)
{
        struct fw_device *device = fw_parent_device(dg00x->unit);
        __be32 data[2];

        /* Unknown. 4bytes. */
        data[0] = cpu_to_be32((device->card->node_id << 16) |
                              (dg00x->async_handler.offset >> 32));
        data[1] = cpu_to_be32(dg00x->async_handler.offset);
        return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
                                  DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
                                  &data, sizeof(data), 0);
}

void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
{
        if (dg00x->async_handler.callback_data == NULL)
                return;

        fw_core_remove_address_handler(&dg00x->async_handler);

        dg00x->async_handler.callback_data = NULL;
}

int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
{
        static const struct fw_address_region resp_register_region = {
                .start  = 0xffffe0000000ull,
                .end    = 0xffffe000ffffull,
        };
        int err;

        dg00x->async_handler.length = 4;
        dg00x->async_handler.address_callback = handle_message;
        dg00x->async_handler.callback_data = dg00x;

        err = fw_core_add_address_handler(&dg00x->async_handler,
                                          &resp_register_region);
        if (err < 0)
                return err;

        err = snd_dg00x_transaction_reregister(dg00x);
        if (err < 0)
                snd_dg00x_transaction_unregister(dg00x);

        return err;
}