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/*
* digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
*
* Copyright (c) 2014-2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include <sound/asound.h>
#include "digi00x.h"
static void handle_unknown_message(struct snd_dg00x *dg00x,
unsigned long long offset, __be32 *buf)
{
unsigned long flags;
spin_lock_irqsave(&dg00x->lock, flags);
dg00x->msg = be32_to_cpu(*buf);
spin_unlock_irqrestore(&dg00x->lock, flags);
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;
}
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